Title of invention: Communication device
Technical field
[0001]
　The present disclosure relates to communication devices.
Background technology
[0002]
　In recent years, expectations for in-vehicle communication (V2X communication) have been increasing for the realization of autonomous driving in the future. V2X communication is an abbreviation for Vehicle to X communication, and is a system in which "something" communicates with a car. Examples of "something" here include vehicles, infrastructure, networks, pedestrians, etc. (V2V, V2I, V2N, and V2P). For example, Patent Document 1 discloses an example of a technique related to V2X communication.
[0003]
　In addition, as wireless communication for automobiles, the development of DSRC (Dedicated Short Range Communication) based on 802.11p has been mainly promoted, but in recent years, LTE-based in-vehicle communication "LTE-" has been promoted. The standardization of "based V2X" has been carried out. LTE-based V2X communication supports the exchange of basic safety messages and the like.
Prior art literature
Patent documents
[0004]
Patent Document 1: Japanese Unexamined Patent Publication No. 2017-2087996
Outline of the invention
Problems to be solved by the invention
[0005]
　By the way, in inter-device communication represented by V2X communication in a side link, transmission and reception are restricted to time division, and transmission or reception is not always possible, so-called HD (Half Duplex) restriction. It may be called. Due to such restrictions on HD, a so-called HD problem in which transmission or reception is restricted may occur even in conventional LTE-V2X communication that supports repetition transmission of broadcast communication.
[0006]
　On the other hand, NR V2X communication supports unicast communication, which has a larger amount of communication data than broadcast communication. Against this background, in NR V2X communication, the HD problem may become more prominent than in conventional V2X communication.
[0007]
　Therefore, the present disclosure proposes a technique that makes it possible to further suppress the manifestation of the HD problem in inter-device communication such as V2X communication.
Means to solve problems
[0008]
　According to the present disclosure, first information regarding a data transmission condition using a communication unit that performs wireless communication and a communication method that switches between transmission and reception in a time-division manner to perform inter-device communication is transmitted via the wireless communication. A communication device including an acquisition unit acquired from the first communication device and a control unit that controls an operation related to reception of data transmitted from the first communication device according to the first information. Is provided.
[0009]
　Further, according to the present disclosure, the first information regarding a data transmission condition using a communication unit that performs wireless communication and a communication method that performs communication between devices by switching between transmission and reception in a time division manner is used for the wireless communication. A communication device including a notification unit that notifies the third communication device via the above, and a control unit that controls an operation related to data transmission to the third communication device after the notification of the first information. Is provided.
Effect of the invention
[0010]
　As described above, according to the present disclosure, there is provided a technique capable of further suppressing the manifestation of the HD problem in inter-device communication such as V2X communication.
[0011]
　It should be noted that the above effects are not necessarily limited, and either in combination with or in place of the above effects, any of the effects shown herein, or any other effect that can be grasped from this specification. May be played.
A brief description of the drawing
[0012]
FIG. 1 is an explanatory diagram for explaining an example of a schematic configuration of a system according to an embodiment of the present disclosure.
[Fig. 2] Fig. 2 is a block diagram showing an example of a configuration of a base station according to the same embodiment.
[Fig. 3] Fig. 3 is a block diagram showing an example of a configuration of a terminal device according to the same embodiment.
FIG. 4 is a diagram showing an outline of V2X communication.
FIG. 5 is an explanatory diagram for explaining an example of an overall image of V2X communication.
FIG. 6 is a diagram showing an example of a use case of V2X communication.
FIG. 7 is an explanatory diagram for explaining an example of a V2X operation scenario.
FIG. 8 is an explanatory diagram for explaining an example of a V2X operation scenario.
FIG. 9 is an explanatory diagram for explaining an example of a V2X operation scenario.
FIG. 10 is an explanatory diagram for explaining an example of a V2X operation scenario.
FIG. 11 is an explanatory diagram for explaining an example of a V2X operation scenario.
FIG. 12 is an explanatory diagram for explaining an example of a V2X operation scenario.
[Fig. 13] Fig. 13 is a diagram showing an example of the configuration of resources allocated to side link communication.
FIG. 14 is an explanatory diagram for explaining an example of an operation timeline when a terminal device transmits a packet based on Mode4 resource allocation.
[Fig. 15] Fig. 15 is an explanatory diagram for explaining an example of a sensing operation for selecting a resource from the resource pool.
FIG. 16 is an explanatory diagram for explaining an outline of an example of the HD problem.
[Fig. 17] Fig. 17 is a sequence diagram showing an example of a processing flow of the system according to the same embodiment.
[Fig. 18] Fig. 18 is an explanatory diagram for explaining an outline of an example of operation of a terminal device according to information regarding the presence or absence of important packets.
FIG. 19 is an explanatory diagram for explaining an outline of processing related to decoding of control information and data by the terminal device according to the same embodiment.
[Fig. 20] Fig. 20 is an explanatory diagram for explaining an example of leveling the transmission / reception ratio.
FIG. 21 is a sequence diagram showing an example of a series of processing flows of the system according to the first embodiment.
FIG. 22 is a sequence diagram showing an example of a series of processing flows of the system according to the second embodiment.
FIG. 23 is a flowchart showing an example of a series of processing flows of a terminal device operating as a transmitting terminal in the system according to the second embodiment.
FIG. 24 is a flowchart showing an example of a series of processing flows of a terminal device operating as a receiving terminal in the system according to the second embodiment.
FIG. 25 is a sequence diagram showing an example of a series of processing flows of the system according to the third embodiment.
FIG. 26 is a block diagram showing a first example of a schematic configuration of an eNB.
FIG. 27 is a block diagram showing a second example of a schematic configuration of an eNB.
[Fig. 28] Fig. 28 is a block diagram showing an example of a schematic configuration of a smartphone.
FIG. 29 is a block diagram showing an example of a schematic configuration of a car navigation device.
Mode for carrying out the invention
[0013]
　Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. In the present specification and the drawings, components having substantially the same functional configuration are designated by the same reference numerals, so that duplicate description will be omitted.
[0014]
　The explanations will be given in the following order.
　1. 1. Configuration example
　　1.1. An example of system configuration
　　1.2. Base station configuration example
　　1.3. Configuration example of terminal device
　2. V2X communication
　3. Allocation method of resources to side links
　4. Examination of HD problem
　5. Technical features
　　5.1. Recognition of each other's situation between transmission and reception terminals
　　5.2. Leveling of sidelink resources
　　5.3. Example
　　　5.3.1. Example 1: First example of the operation relating to the addition of the unicast link
　　　5.3.2. Example 2: Second example of the operation relating to the addition of the unicast link
　　　5.3.3. Example 3: Third example of the operation related to the addition of the unicast link
　6. Application example
　　6.1. Application example related to base station
　　6.2. Application example related to terminal device
　7. Conclusion
[0015]
　<< 1. Configuration example >> <1.1. Example of System Configuration>
　First, an example of a schematic configuration of the system 1 according to the embodiment of the present disclosure will be described with reference to FIG. FIG. 1 is an explanatory diagram for explaining an example of a schematic configuration of the system 1 according to the embodiment of the present disclosure. As shown in FIG. 1, the system 1 includes a wireless communication device 100 and a terminal device 200. Here, the terminal device 200 is also referred to as a user. The user may also be referred to as a UE. The wireless communication device 100C is also called a UE-Relay. The UE here may be a UE defined in LTE or LTE-A, and the UE-Relay may be a Prose UE to Network Relay discussed in 3GPP, and more generally communicate. It may mean a device.
[0016]
　　(1) Wireless Communication Device 100 The
　wireless communication device 100 is a device that provides a wireless communication service to a subordinate device. For example, the wireless communication device 100A is a base station of a cellular system (or mobile communication system). The base station 100A performs wireless communication with a device (for example, a terminal device 200A) located inside the cell 10A of the base station 100A. For example, the base station 100A transmits a downlink signal to the terminal device 200A and receives an uplink signal from the terminal device 200A.
[0017]
　The base station 100A is logically connected to another base station by, for example, an X2 interface, and can transmit and receive control information and the like. Further, the base station 100A is logically connected to a so-called core network (not shown) by, for example, an S1 interface, and can transmit and receive control information and the like. Communication between these devices can be physically relayed by various devices.
[0018]
　Here, the wireless communication device 100A shown in FIG. 1 is a macro cell base station, and cell 10A is a macro cell. On the other hand, the wireless communication devices 100B and 100C are master devices that operate the small cells 10B and 10C, respectively. As an example, the master device 100B is a small cell base station that is fixedly installed. The small cell base station 100B establishes a wireless backhaul link with the macrocell base station 100A and an access link with one or more terminal devices (eg, terminal device 200B) in the small cell 10B. The wireless communication device 100B may be a relay node defined by 3GPP. The master device 100C is a dynamic AP (access point). The dynamic AP100C is a mobile device that dynamically operates the small cell 10C. The dynamic AP100C establishes a wireless backhaul link with the macrocell base station 100A and an access link with one or more terminal devices (eg, terminal device 200C) in the small cell 10C. The dynamic AP100C may be, for example, a terminal device equipped with hardware or software capable of operating as a base station or a wireless access point. The small cell 10C in this case is a dynamically formed localized network (Localized Network / Virtual Cell).
[0019]
　Cell 10A is an arbitrary wireless communication system such as LTE, LTE-A (LTE-Advanced), LTE-ADVANCED PRO, GSM®, UMTS, W-CDMA, CDMA2000, WiMAX, WiMAX2 or 802.16. It may be operated according to.
[0020]
　The small cell is a concept that can include various types of cells smaller than a macro cell (for example, femtocell, nanocell, picocell, microcell, etc.) that are arranged so as to overlap or do not overlap with the macrocell. In one example, the small cell is operated by a dedicated base station. In another example, the small cell is operated by the terminal serving as the master device temporarily operating as a small cell base station. So-called relay nodes can also be considered as a form of small cell base station. A wireless communication device that functions as a master station of a relay node is also called a donor base station. Donor base station may mean DeNB in ​​LTE, or more generally the master station of a relay node.
[0021]
　　(2) Terminal device 200 The
　terminal device 200 can communicate in a cellular system (or mobile communication system). The terminal device 200 performs wireless communication with a wireless communication device of the cellular system (for example, base station 100A, master device 100B or 100C). For example, the terminal device 200A receives the downlink signal from the base station 100A and transmits the uplink signal to the base station 100A.
[0022]
　Further, the terminal device 200 is not limited to the so-called UE, and for example, a so-called low cost terminal (Low cost UE) such as an MTC terminal, an eMTC (Enhanced MTC) terminal, and an NB-IoT terminal may be applied. .. Further, an infrastructure terminal such as an RSU (Road Side Unit) or a terminal such as a CPE (Customer Premises Equipment) may be applied.
[0023]
　　(3) Supplement Although
　the schematic configuration of the system 1 has been shown above, the present technology is not limited to the example shown in FIG. For example, as the configuration of the system 1, a configuration that does not include a master device, SCE (Small Cell Enhancement), HetNet (Heterogeneous Network), an MTC network, or the like can be adopted. Further, as another example of the configuration of the system 1, the master device may be connected to the small cell and the cell may be constructed under the small cell.
[0024]
　　<1.2. Configuration Example of Base Station>
　Next, the configuration of the base station 100 according to the embodiment of the present disclosure will be described with reference to FIG. FIG. 2 is a block diagram showing an example of the configuration of the base station 100 according to the embodiment of the present disclosure. Referring to FIG. 2, the base station 100 includes an antenna unit 110, a wireless communication unit 120, a network communication unit 130, a storage unit 140, and a control unit 150.
[0025]
　(1) Antenna unit 110 The
　antenna unit 110 radiates a signal output by the wireless communication unit 120 into space as a radio wave. Further, the antenna unit 110 converts a radio wave in space into a signal and outputs the signal to the wireless communication unit 120.
[0026]
　(2) Wireless communication unit 120 The
　wireless communication unit 120 transmits and receives signals. For example, the wireless communication unit 120 transmits a downlink signal to the terminal device and receives an uplink signal from the terminal device.
[0027]
　(3) Network communication unit 130 The
　network communication unit 130 transmits / receives information. For example, the network communication unit 130 transmits information to another node and receives information from the other node. For example, the other nodes include other base stations and core network nodes.
[0028]
　As described above, in the system 1 according to the present embodiment, the terminal device may operate as a relay terminal and relay the communication between the remote terminal and the base station. In such a case, for example, the wireless communication device 100C corresponding to the relay terminal may not include the network communication unit 130.
[0029]
　(4) Storage unit 140 The
　storage unit 140 temporarily or permanently stores a program and various data for the operation of the base station 100.
[0030]
　(5) Control unit 150 The
　control unit 150 provides various functions of the base station 100. The control unit 150 includes a communication control unit 151, an information acquisition unit 153, and a notification unit 155. The control unit 150 may further include other components other than these components. That is, the control unit 150 can perform operations other than the operations of these components.
[0031]
　The communication control unit 151 executes various processes related to the control of wireless communication with the terminal device 200 via the wireless communication unit 120. In addition, the communication control unit 151 executes various processes related to the control of communication with other nodes (for example, other base stations, core network nodes, etc.) via the network communication unit 130.
[0032]
　The information acquisition unit 153 acquires various information from the terminal device 200 and other nodes. The acquired information may be used, for example, for control of wireless communication with a terminal device, control for cooperation with other nodes, and the like.
[0033]
　The notification unit 155 notifies the terminal device 200 and other nodes of various information. As a specific example, the notification unit 155 may notify the terminal device of various information for the terminal device in the cell to perform wireless communication with the base station. Further, as another example, the notification unit 155 may notify another node (for example, another base station) of the information acquired from the terminal device in the cell.
[0034]
　　<1.3. Configuration Example of Terminal Device>
　Next, an example of the configuration of the terminal device 200 according to the embodiment of the present disclosure will be described with reference to FIG. FIG. 3 is a block diagram showing an example of the configuration of the terminal device 200 according to the embodiment of the present disclosure. As shown in FIG. 3, the terminal device 200 includes an antenna unit 210, a wireless communication unit 220, a storage unit 230, and a control unit 240.
[0035]
　(1) Antenna unit 210 The
　antenna unit 210 radiates a signal output by the wireless communication unit 220 into space as a radio wave. Further, the antenna unit 210 converts a radio wave in space into a signal and outputs the signal to the wireless communication unit 220.
[0036]
　(2) Wireless communication unit 220 The
　wireless communication unit 220 transmits and receives signals. For example, the wireless communication unit 220 receives the downlink signal from the base station and transmits the uplink signal to the base station.
[0037]
　Further, in the system 1 according to the present embodiment, the terminal device 200 may directly communicate with another terminal device 200 without going through the base station 100. In this case, the wireless communication unit 220 may transmit and receive a side link signal to and from another terminal device 200.
[0038]
　(3) Storage unit 230 The
　storage unit 230 temporarily or permanently stores a program and various data for the operation of the terminal device 200.
[0039]
　(4) Control unit 240 The
　control unit 240 provides various functions of the terminal device 200. For example, the control unit 240 includes a communication control unit 241, an information acquisition unit 243, and a notification unit 247. The control unit 240 may further include other components other than these components. That is, the control unit 240 may perform operations other than the operations of these components.
[0040]
　The communication control unit 241 executes various processes related to the control of wireless communication with the base station 100 and other terminal devices 200 via the wireless communication unit 220. For example, the communication control unit 241 may reserve a resource to be used for transmitting a packet. Further, the communication control unit 241 may select a part of the reserved resources and control the packet to be transmitted using the selected resources.
[0041]
　Further, the communication control unit 241 may make a predetermined determination based on the information acquired from the base station 100 or another terminal device 200. As a more specific example, the communication control unit 241 may determine whether or not a packet can be transmitted to another terminal device 200. Further, at this time, the communication control unit 241 may determine whether or not to drop the packet to be transmitted to the other terminal device 200.
[0042]
　The information acquisition unit 243 acquires various information from the base station 100 and other terminal devices 200. As a specific example, the information acquisition unit 243 may acquire information about another terminal device 200 (for example, reception capability, etc.) from the other terminal device 200. In addition, the information acquisition unit 243 may acquire various information for selecting resources to be used for communication with the other terminal device 200 from the base station 100 or the other terminal device 200. As a more specific example, the information acquisition unit 243 may acquire information about resources reserved by the other terminal device 200 from the other terminal device 200.
[0043]
　The notification unit 247 notifies the base station 100 and other terminal devices 200 of various information. As a specific example, the notification unit 247 may notify another terminal device 200 (for example, the terminal device 200 to which the data or packet is transmitted) of information about the data or packet to be transmitted. In addition, the notification unit 247 may notify another terminal device 200 of information about a resource reserved for use in transmitting the packet.
[0044]
　<< 2. V2X communication >>
　Next, the outline of V2X communication will be described. V2X communication is an abbreviation for Vehicle to X communication, and is a system in which "something" communicates with a car. For example, FIG. 4 is a diagram showing an outline of V2X communication. Examples of "something" here include, for example, a vehicle, an infrastructure, a network, a pedestrian, and the like (V2V, V2I), as shown in FIG. , V2N, and V2P).
[0045]
　(Overview of V2X Communication)
　FIG. 5 is an explanatory diagram for explaining an example of the overall image of V2X communication. In the example shown in FIG. 5, a V2X application server (APP server) is held as a cloud server, and the application server controls V2X communication on the core network side. The base station performs Uu-link communication with the terminal device, while performing communication control of direct communication such as V2V communication and V2P communication. In addition to the base station, an RSU (Road Side Unit) is arranged as a roadside infrastructure. There are two possible RSUs, a base station type RSU and a UE type RSU. In RSU, V2X application (V2X APP) is provided and support such as data relay is provided.
[0046]
　(Use case of V2X communication) As
　wireless communication for automobiles, the development of DSRC (Dedicated Short Range Communication) based on 802.11p has been mainly promoted, but in recent years, LTE-based in-vehicle communication has been promoted. "LTE-based V2X (LTE-based V2X communication)" has been standardized. LTE-based V2X communication supports the exchange of basic safety messages and the like. On the other hand, with the aim of further improving V2X communication, NR V2X communication using 5G technology (NR: New Radio) has been studied in recent years. For example, FIG. 6 is a diagram showing an example of a use case of V2X communication.
[0047]
　NR V2X communication supports new use cases that require high reliability, low latency, high speed communication, and high capacity, which were previously difficult to support with LTE-based V2X. As a specific example, among the examples shown in FIG. 6, for example, provision of a dynamic map, remote driving, and the like can be mentioned. In addition to this, there are sensor data sharing in which sensor data is exchanged between vehicles and road vehicles, and plateoning use cases for platooning. Use cases and requirements for such NR V2X communication are specified in 3GPP TR22.886. For reference, an outline of an example of a use case will be described below.
[0048]
　(1) Vehicles Platoonning This
　is a use case of platooning in which multiple vehicles form a platoon and travel in the same direction. Information exchange for controlling platooning between the vehicle leading the platooning and another vehicle. Is done. By exchanging such information, for example, it becomes possible to further reduce the inter-vehicle distance of platooning.
[0049]
　(2) Extended Sensors This
　is a use case in which sensor-related information (raw data before data processing and data after processing) can be exchanged between vehicles. Sensor information is collected through local sensors, live video images (eg, live video images between surrounding vehicles, RSUs, and pedestrians), V2X application servers, and the like. By exchanging these information, the vehicle can obtain information that cannot be obtained by its own sensor information, and can recognize / recognize a wider range of environments. In this use case, since it is necessary to exchange a lot of information, a high data rate is required for communication.
[0050]
　(3) Advanced Driving This
　is a use case that enables semi-automatic driving and fully automatic driving. In this use case, the RSU shares the cognitive / recognition information obtained from its own sensors, etc. with the surrounding vehicles so that each vehicle adjusts the track and operation in synchronization with other vehicles. Can be done. In addition, each vehicle can share the intention and intention of driving with neighboring vehicles.
[0051]
　(4) Remote Driving This
　is a use case in which a remote controller or a V2X application is remotely controlled. Remote control is used when another person drives on behalf of a person who has difficulty driving, or when operating a vehicle in a dangerous area. For public transportation, for example, cloud computing-based maneuvers can be applied to public transportation where routes and roads are fixed to some extent. In this use case, high reliability and low transmission delay are required for communication.
[0052]
　(Physical Layer Enhancement) In
　order to achieve the above-mentioned requirements, further enhancement of the physical layer from LTE V2X is required. Target links include Uu links and PC5 links (side links). A Uu link is a link between an infrastructure such as a base station or RSU (Road Side Unit) and a terminal device. The PC5 link (side link) is a link between terminal devices. The main points of enhancement are shown below.
[0053]
　Examples of enhancements include:
　・ Channel format
　・ Sidelink feedback communication
　・ Sidelink resource allocation method
　・ Vehicle position information estimation technology
　・ Terminal-to-terminal relay communication
　・ Unicast communication, multicast communication support
　・ Multicarrier communication, carrier aggregation
　・ MIMO / beamforming
　・ High frequency frequency support (Example: 6GHz or higher)
　... etc.
[0054]
　Examples of the channel format include Flexible numerology, short TTI (Transmission Time Interval), multi-antenna support, and Waveform. Further, examples of the side link feedback communication include HARQ, CSI (Channel Status Information) and the like.
[0055]
　(V2X Operation Scenario)
　An example of a V2X communication operation scenario will be described below. In V2N communication, only DL / UL communication between the base station and the terminal device was simple. On the other hand, in V2V communication, various communication paths can be considered. In the following, each scenario will be described mainly focusing on the example of V2V communication, but the same communication operation can be applied to V2P and V2I. In V2P and V2I, the communication destination is Pedestrian or RSU.
[0056]
　For example, FIGS. 7 to 12 are explanatory diagrams for explaining an example of a V2X operation scenario. Specifically, FIG. 7 shows a scenario in which vehicles directly communicate with each other without going through a base station (E-UTRAN). FIG. 8 shows a scenario in which vehicles communicate with each other via a base station. 9 and 10 show a scenario in which vehicles communicate with each other via a terminal device (UE, here RSU) and a base station. 11 and 12 show a scenario in which vehicles communicate with each other via a terminal device (UE, in this case RSU or another vehicle).
[0057]
　In addition, in FIGS. 7 to 12, the "side link" corresponds to a communication link between terminal devices and is also referred to as PC5. Specific examples of side links include V2V, V2P, and V2I communication links. The "Uu interface" corresponds to a wireless interface between a terminal device and a base station. A specific example of the Uu interface is a V2N communication link. The "PC5 interface" corresponds to a wireless interface between terminal devices.
[0058]
　<< 3. Sidelink resource allocation method >>
　Next, the outline of the resource allocation method to the sidelink will be described. As the method of resource allocation to the side link, the method of "Mode 3 resource allocation" in which the base station allocates the resource of the side link and the method of "Mode 4 resource allocation" in which the terminal device itself senses and selects the resource of the side link. There is. Here, we mainly focus on the Mode4 resource allocation method.
[0059]

　-Resource 　pool allocation Mode4 When allocating resources, the resource pool is allocated in advance. The allocation of the resource pool is performed by, for example, a base station. Further, as another example, the resource pool may be allocated by Preconfiguration. The terminal device senses resources for side-link communication from the allocated resource pool, selects an appropriate resource by itself, and communicates.
[0060]
　For example, FIG. 13 is a diagram showing an example of the configuration of resources (resource pools) allocated to side-link communication, and shows an example of a case where frequency division multiplexing (FDM) is applied. .. As shown in FIG. 13, the resource pool is divided into an SA (Scheduling Assignment) area and a Data area, and PSCCH (Physical Sidelink Control Channel) and PSCH (Physical Sidelink Shared Channel) are transmitted by each area. In the following, the description will be focused on the case where FDM is applied as shown in FIG. 13, but the application destination of the technology according to the present disclosure is not necessarily limited. As a specific example, even when time division multiplexing (TDM) is applied, it is possible to apply the technique according to the present disclosure described below. When TDM is applied, the SA region and the Data region are orthogonal to each other on the time axis.
[0061]
　· Mode4 resource allocation
　with reference to Figure 14, an outline of Mode4 resource allocation. FIG. 14 is an explanatory diagram for explaining an example of an operation timeline when the terminal device transmits a packet based on the Mode4 resource allocation. As shown in FIG. 14, the terminal device that transmits a packet first performs sensing in order to discover a resource used for transmitting the packet from the resource pool. Next, the terminal device selects a resource from the resource pool based on the result of the sensing. Then, the terminal device transmits the packet using the selected resource. Further, at this time, the terminal device reserves a resource to be used for subsequent packet transmission, if necessary.
[0062]
　Here, an example of the above sensing operation will be described with reference to FIG. FIG. 15 is an explanatory diagram for explaining an example of a sensing operation for selecting a resource from the resource pool.
[0063]
　Specifically, the terminal device selects a resource in the resource selection window and reserves a future resource based on the measurement result of the interference pattern in the sensing window and the resource reservation status in the sensing window. As a specific example, in the example shown in FIG. 15, when the packet D to be transmitted is generated, the terminal device uses the future resource usage status, for example, another packet in the future, based on the sensing result. Predict the resources used to transmit A to C. By using the result of the prediction, the terminal device can select and reserve a resource that can be used for transmitting the packet D, that is, a resource that is predicted not to be used for transmitting another packet.
[0064]
　<< 4. Examination of HD Problem >> In
　this disclosure, we pay particular attention to the resource allocation method of V2V communication link in NR V2X communication. In NR V2X communication, unicast communication with a larger amount of communication data is supported as compared with the broadcast communication applied in the conventional V2X communication. Against this background, in NR V2X communication, the so-called HD (Half Duplex) problem, which may also occur in broadcast communication in conventional V2V communication, may become more prominent. Therefore, in this disclosure, we pay particular attention to the HD problem in NR V2X communication.
[0065]
　Here, the outline of the HD problem will be described. In inter-device communication represented by V2X communication in a side link, transmission and reception are restricted to time division, and transmission or reception is not always possible, so-called HD (Half Duplex) restriction is applied. In some cases. Due to such restrictions, the terminal device 200 is restricted from receiving packets transmitted from other terminal devices 200 at the timing of its own transmission.
[0066]
　The conventional LTE-V2X communication supports the repetition transmission of broadcast communication. As a result, even when the reception of the packet is restricted by the transmission of the packet, it is possible to increase the reception success rate of the packet by utilizing the next reception opportunity.
[0067]
　On the other hand, in NR V2X communication, as described above, not only broadcast communication but also unicast communication that enables transmission and reception of a signal having a larger capacity than the broadcast communication is supported. It is presumed that the transmission / reception of such a large-capacity signal largely depends on the restrictions of HD.
[0068]
　Here, with reference to FIG. 16, an outline of an example of the HD problem that is presumed to be manifested by NR V2X communication will be described. FIG. 16 is an explanatory diagram for explaining an outline of an example of the HD problem. In FIG. 16, each of the terminals A to D corresponds to the terminal device 200 according to the present disclosure.
[0069]
　In the example shown in FIG. 16, each of terminal A and terminal B intends to transmit a packet to terminal C. Further, the terminal C is trying to transmit a packet to the terminal D. Under such a situation, when each of the terminal A and the terminal B transmits the packet to the terminal C endlessly, the terminal C receives the packet from each of the terminal A and the terminal B and sends the packet to the terminal D. The transmission of packets is restricted, which may result in the loss of the opportunity to transmit packets to the terminal D. In particular, unicast communication is significantly different from traffic that broadcasts packets having a relatively small capacity, and the HD problem as described above with reference to FIG. 16 is more likely to become apparent.
[0070]
　From such a background, it is presumed that coordination between transmission and reception is necessary in order to further suppress the emergence of the HD problem. Therefore, in the present disclosure, a technology that makes it possible to further suppress the emergence of the HD problem in inter-device communication such as V2X communication (particularly, inter-device communication in which HD restrictions such as side link communication) is proposed. To do.
[0071]
　<< 5. Technical Features >>
　Subsequently, as a technical feature of the system according to the embodiment of the present disclosure, it is possible to further suppress the manifestation of the HD problem, particularly in inter-device communication such as side link communication in NR V2X communication. We will focus on the technology for this. Specifically, the following approaches will be described as examples of technologies that can further suppress the manifestation of the HD problem.
　・ Recognition of each other's situation between sending and receiving terminals ・ Leveling of sidelink
　resources
[0072]
　　<5.1. Recognizing each other's situation between transmitting and receiving terminals> As
　an example of the technology that can suppress the manifestation of the HD problem, first, about the technology that suppresses the manifestation of the HD problem by recognizing each other's situation between the transmitting and receiving terminals. explain.
[0073]
　The exchange of information between terminal devices is determined according to either Mode4 resource allocation or Mode3 resource allocation. For example, in the case of Mode4 resource allocation, notifications using SCI (Sidelink Control Information) and notifications using Sidelink RRC signaling can be mentioned. Sidelink RRC signalling is RRC information defined between terminals. In the case of Mode3 resource allocation, notification by RRC signalling with the base station can be mentioned.
[0074]
　　(1) Exchange of prior information
　First, information performed before transmission of a packet between a terminal device 200 (that is, a transmitting terminal) corresponding to the transmitting side and a terminal device 200 (receiving terminal) corresponding to the receiving side. The exchange of Mode4 resource allocation and Mode3 resource allocation will be explained separately. In the following description, for convenience, the case where the terminal device 200-1 transmits a packet to the terminal device 200-2 will be described. That is, it is assumed that the terminal device 200-1 operates as a transmitting terminal and transmits a packet to the terminal device 200-2 operating as a receiving terminal. On the other hand, the terminal device 200-1 may operate as a receiving terminal, and the terminal device 200-2 may operate as a transmitting terminal. That is, when the terminal device 200-1 receives a packet transmitted from another terminal device 200, it operates as a receiving terminal. Further, when the terminal device 200-2 transmits a packet to another terminal device 200, it operates as a transmitting terminal.
[0075]
　　(1-1) Mode4 Resource Allocation
　The exchange of information between the terminal devices 200 will be described below, focusing on the case of Mode4 resource allocation.
[0076]
　　(1-1-1) Notification from the transmitting terminal to the receiving terminal
　First, an example of information notified by the terminal device 200-1 (transmitting terminal) to the terminal device 200-2 (receiving terminal) will be described. The terminal device 200-1 may notify the terminal device 200-2, which is the transmission destination of the packet, in advance, for example, buffer information of transmission data, information on a future packet transmission schedule, packet type information, and the like. Good. Examples of the packet type information include information on traffic types such as unicast, broadcast, and multicast, information on priority, information on delay requests, and information on the presence or absence of relays. Further, in V2X communication, the freshness and expiration date of the packet may be set. In such a case, the terminal device 200-1 may notify the terminal device 200-2 in advance of information regarding the packet reception deadline.
[0077]
　In addition, when the terminal device 200-1 (transmitting terminal) plans to transmit data having a higher importance than the normal data, the terminal device 200-2 (receiving terminal) regarding the important data. You may notify that a packet has been sent. Further, the terminal device 200-1 may notify the terminal device 200-2 that the unicast traffic is to be transmitted when the data is transmitted by the unicast.
[0078]
　In this case, it is advisable to provide a specific resource area with an area for notifying whether or not there is important data as data to be transmitted. Hereinafter, the area is also referred to as an "important data notification area". Hereinafter, the notification will also be referred to as "notification of presence / absence of important data" for convenience. By providing the important data notification area in this way, the terminal device 200-2 (reception terminal) is a packet transmitted from the terminal device 200-1 (transmission terminal) based on the information notified via the area. It is possible to recognize in advance that a packet of important data is included in the. Further, when the terminal device 200-2 is notified that there is important data, it is possible to give priority to the operation related to reception and take measures such as limiting the operation related to transmission.
[0079]
　In addition, resources for notifying the presence or absence of important data may be defined. The resource may be defined as a resource pool. Further, the resource may be set by the base station 100 or may be preconfigured.
[0080]
　Further, a data area in which the priority of transmission / reception is controlled according to the notification of the presence / absence of important data may be defined as a specific data area. In this case, priority control of transmission / reception may be applied only to the specific data area.
[0081]
　Specifically, the terminal device 200-1 (transmission terminal) transmits information on the presence / absence of important packets and information on resources to which control information of the packets is notified to a packet transmission destination via the important data notification area. Notify the terminal device 200-2. The terminal device 200-2 acquires information regarding the presence / absence of important packets notified from the terminal device 200-1 by decoding the important data notification area. The terminal device 200-2 determines the presence / absence of a packet of important data based on the acquired information, and when the transmission of the packet of important data is confirmed, decodes the subsequent control information and data. Further, when the transmission of the important data packet is not confirmed, the terminal device 200-2 does not have to perform the subsequent decoding of the control information and the data.
[0082]
　Here, with reference to FIG. 17, an example of notification of information from the terminal device 200-1 (transmitting terminal) to the terminal device 200-2 (reception terminal) and the operation of the terminal device 200-2 receiving the notification. Will be described. FIG. 17 is a sequence diagram showing an example of the processing flow of the system according to the present embodiment, and shows an example of notification of information from a transmitting terminal to a receiving terminal and an example of an operation on the receiving terminal side receiving the notification. Shown.
[0083]
　As shown in FIG. 17, when the packet to be transmitted is generated (S101), the terminal device 200-1 (notification unit 247) relates to information regarding the presence / absence of important packets and resources to which control information of the packet is notified. The information is notified to the terminal device 200-2, which is the transmission destination of the packet, via the important data notification area (S103). At this time, the terminal device 200-1 may notify information such as the importance level of the target packet and the priority level as information regarding the presence or absence of important packets. Then, the terminal device 200-1 (communication control unit 241) transmits a packet of target data via the resource notified by the control information.
[0084]
　The terminal device 200-2 (information acquisition unit 243) acquires information regarding the presence / absence of important packets notified from the terminal device 200-1 by decoding the important data notification area (S105). The terminal device 200-2 (communication control unit 241) determines whether to prioritize the reception of the packet or the transmission of the packet based on the acquired information, and transmits or transmits the packet according to the result of the determination. The operation related to reception is controlled (S107).
[0085]
　For example, FIG. 18 is an explanatory diagram for explaining an outline of an example of the operation of the terminal device 200 according to the information regarding the presence / absence of important packets. Specifically, the terminal device 200-2 (reception terminal) may prioritize the reception of the packet when it recognizes that the important packet is included. In this case, the terminal device 200-2 may limit the operation related to the transmission of the packet to the other terminal device 200. Further, when the terminal device 200-2 recognizes that the important packet is not included, the terminal device 200-2 may give priority to the transmission of the packet. In this case, the terminal device 200-2 may limit the operation related to the reception of the packet transmitted from the terminal device 200-1 (transmission terminal).
[0086]
　Further, when the terminal device 200-2 (communication control unit 241) determines that the reception of the packet is prioritized, each of the other terminal devices 200 including the terminal device 200-1 or the transmitted packet is prioritized. It may be determined whether or not to perform, and the operation related to the reception of the packet may be controlled according to the result of the determination. In the following, it is assumed that the terminal device 200-2 determines that the reception of the packet is prioritized.
[0087]
　The terminal device 200-2 (information acquisition unit 243), which has determined to prioritize the reception of packets, acquires control information by decoding the resource area instructed based on the notification from the terminal device 200-1 (S111). .. Then, the terminal device 200-2 (communication control unit 241) receives the data transmitted from the terminal device 200-1 by decoding the data area based on the control information (S113).
[0088]
　For example, FIG. 19 is an explanatory diagram for explaining an outline of processing related to decoding of control information and data by the terminal device 200 according to the present embodiment. In the example shown in FIG. 19, the important data notification area, the control information area to which the control information is assigned, and the data area to which the data is assigned are individually set. In the important data notification area, information regarding the presence / absence of important data and information regarding the control information area are set. That is, the terminal device 200-2 (reception terminal) extracts the control information from the control information area by decoding the control information area based on the information set in the important data notification area. In addition, the control information includes information regarding a data area. That is, the terminal device 200-2 can decode the data area and receive the data transmitted via the data area by referring to the data area based on the extracted control information. Of the areas to which resources are allocated, the important data notification area corresponds to an example of the "first partial area", and information is provided via the first partial area (important data notification area) like the control information area. Corresponds to an example of the "second subregion" in which the area is notified.
[0089]
　Further, the terminal device 200-1 (transmission terminal) may inquire of the terminal device 200-2, which is the transmission destination of the packet, whether or not the packet can be transmitted. In this case, if the terminal device 200-2 (reception terminal) can receive the packet, the terminal device 200-2 may return the information (OK reply) indicating approval to the above inquiry from the terminal device 200-1. Good. Then, the terminal device 200-1 starts transmitting a packet to the terminal device 200-2 when the approval from the terminal device 200-2 is obtained.
[0090]
　Further, the terminal device 200-1 (transmission terminal) is used for transmitting the packet when inquiring whether or not the packet can be transmitted to the terminal device 200-2 to which the packet is transmitted. You may also be notified of information about the resources you plan to do. In this case, the terminal device 200-2 (reception terminal) determines whether or not the packet transmitted from the terminal device 200-1 can be received via the resource notified from the terminal device 200-1. You may.
[0091]
　Further, the terminal device 200-2 (reception terminal) may instruct or propose a resource to be used for packet transmission to the terminal device 200-1 (transmission terminal).
[0092]
　The various operations illustrated above may be executed based on a trigger according to a predetermined condition. As a specific example, the various operations described above may be executed when the size of the transmitted data is larger than the threshold value.
[0093]
　Further, when the proposal from the terminal device 200-1 (transmission terminal) is rejected more than a predetermined number of times, the terminal device 200-1 separately controls the operation related to the transmission of the target data (packet). May be good. As a specific example, the terminal device 200-1 may randomly transmit the data when the proposal relating to the transmission of the data is rejected more than a predetermined number of times, or the terminal device 200-1 may transmit the packet related to the transmission of the data. You may drop it.
[0094]
　The example of the information notified by the terminal device 200-1 (transmitting terminal) to the terminal device 200-2 (receiving terminal) has been described above. A series of information notified in advance of packet transmission from the terminal device 200-1 (transmitting terminal) to the terminal device 200-2 (receiving terminal) described above is an example of "first information". Equivalent to. Further, the information notified via the important data notification area corresponds to an example of "second information". The second information may include a part of the first information, such as information regarding the presence or absence of important data.
[0095]
　　(1-1-2) Notification from the receiving terminal to the transmitting terminal
　Subsequently, an example of information notified by the terminal device 200-2 (receiving terminal) to the terminal device 200-1 (transmitting terminal) will be described. The terminal device 200-2 refers to other terminal devices 200 (for example, terminal device 200-1) existing in the vicinity, for example, Capability information related to packet reception (hereinafter, also referred to as “received Capability information”) and the like. Information regarding the reception of the packet, such as, may be notified in advance. As a specific example, the terminal device 200-2 may periodically notify other terminal devices 200 existing in the vicinity of the received Capability information as dynamic information. In addition, like the reception Capability information, the information regarding the reception of the packet, which is notified in advance from the terminal device 200-2 (reception terminal) to the terminal device 200-1 (transmission terminal), is "third information". Corresponds to an example of.
[0096]
　The reception Capability information includes, for example, the number of receiving antennas, information on receivers (for example, IRC receivers, etc.), information on receivable resource pools (sub-resource pools), information on packet transmission, information on packet reception, and the like. Be done.
[0097]
　The information related to packet transmission corresponds to the information related to packet transmission to another terminal device 200 when the terminal device 200-2 operates as a transmitting terminal. Examples of the information related to the transmission of the packet include the following information.
　-Information about the buffer of
　transmission data-Type of transmission data (for example, unicast, broadcast, multicast, etc.)-Information about priority and delay request 　of transmission packet-
　Information about traffic type related to
packet transmission-For packet transmission Information about resources to be used
　... etc.
[0098]
　Further, the information related to the reception of the packet corresponds to the information related to the reception of the packet transmitted from the other terminal device 200 when the terminal device 200-2 operates as the receiving terminal. Examples of the information regarding the reception of the packet include the following information.
　-Number of unicast communication connections possible-Number
　of unicast communication connections (that is, information indicating how many terminal devices are connected)
　-Information on the received data rate or information on the received bits in a certain period
　-Reception rate (overall area)
　( Information indicating how much resources are being received for) -Receivable rate ( information indicating how much resources can be received for the entire area)
　-Type of received packet (for example, Unicast) Cast, broadcast, multicast, etc.)
　・ Information on the priority and delay request of received packets
　... etc.
[0099]
　The information listed above as information regarding packet reception may be collectively defined as a reception Capability level (in other words, an HD tolerance level). In this case, the value of the reception Capability level may be defined according to the combination of the levels of the information listed above as the information regarding the reception of the packet. As a result, the other terminal device 200 notified of the reception Capability level can recognize the reception Capability of the notification source terminal device 200 based on the information regarding the reception of the packet associated with the value of the reception Capability level. It will be possible.
[0100]
　Further, even if the terminal device 200-2 (reception terminal) notifies another terminal device 200 (for example, the terminal device 200-1 operating as a transmission terminal) of information regarding resources capable of receiving packets. Good. At this time, the terminal device 200-2 (reception terminal) may notify the other terminal device 200 of information regarding the time frequency domain of the resource capable of receiving the packet.
[0101]
　The example of the information notified by the terminal device 200-2 (reception terminal) to the terminal device 200-1 (transmission terminal) has been described above.
[0102]
　　(1-2) Mode3 Resource Allocation
　Next, focusing on the Mode3 resource allocation, information exchange between terminal devices will be described. In the case of Mode3 resource allocation, information transmission / reception between the terminal devices 200 is performed via a device having authority for controlling side link communication, such as a base station 100 or the like. The information sent and received is the same as the information described above as an example of Mode4 resource allocation.
[0103]
　In addition, Mode3 resource allocation and Mode4 resource allocation may be executed in combination. In this case, the example in the case of Mode3 resource allocation and the example in the case of Mode4 resource allocation may be applied in combination with respect to the exchange of information between the terminal devices 200.
[0104]
　　(2) Correspondence after the exchange of information
　Next, an example of the correspondence in each terminal device 200 after the information is exchanged between the terminal devices 200 will be described. In the following description, as in the case of exchanging information between the terminal devices 200, for convenience, when the terminal device 200-1 (transmitting terminal) transmits a packet to the terminal device 200-2 (receiving terminal). The explanation will be focused on. Further, the terminal device 200-1 may operate as a receiving terminal, and the terminal device 200-2 may operate as a transmitting terminal.
[0105]
　　(2-1) Correspondence of Terminal Device on Transmission Side
　First, an example of correspondence on the terminal device 200-1 side operating as a transmission terminal will be described.
[0106]
　For example, the terminal device 200-1 (transmitting terminal) controls the priority between the transmission of the packet and the reception of the packet according to the result of exchanging information with the terminal device 200-2 (reception terminal). May be good. That is, the terminal device 200-1 may give priority to the transmission of the packet to the terminal device 200-2 depending on the result of exchanging information with the terminal device 200-2, or the terminal device 200-1 may give priority to transmission from another terminal device 200. The reception of the packet may be prioritized. Further, the priority control may be applied only to communication via a specific resource.
[0107]
　Further, the priority is not limited to the transmission / reception priority, and the priority may be controlled according to various conditions. For example, terminal device 200-1 may prioritize communication of a particular traffic type. As a specific example, the terminal device 200-1 may give priority to broadcast communication.
[0108]
　Further, the terminal device 200-1 has various priorities (for example, transmission / reception priority) based on the position information of at least one of its own position information and another device (for example, another terminal device 200, etc.). Traffic type priority, etc.) may be determined. Further, other devices that use the position information include another terminal device 200 that is a destination of the packet of the terminal device 200-1 and another terminal device 200 that transmits the packet to the terminal device 200-1. At least one of them can be equivalent. As a specific example, the terminal device 200-1 is controlled to give priority to unicast communication when it is determined that unicast communication should be prioritized according to the positional relationship with another terminal device 200. You may.
[0109]
　Further, the terminal device 200-1 may determine various priorities (for example, transmission / reception priority, traffic type priority, etc.) based on the channel congestion (CBR: Channel Busy Ratio). As a specific example, the terminal device 200-1 may give priority to broadcasting because it may be difficult to receive unicast when the channel is congested.
[0110]
　Further, the terminal device 200-1 may determine various priorities (for example, transmission / reception priority, traffic type priority, etc.) based on the channel occupancy ratio (CR). CR is a parameter indicating the ratio of the transmission of the target device occupying the resource. As a specific example, when the terminal device 200-1 occupies a large amount of resources and the CR is higher (for example, when the CR is equal to or higher than the threshold value), the frequency of reception is increased so as to further reduce the CR. It may be controlled to be higher.
[0111]
　Further, the terminal device 200-1 (transmission terminal) may change the transmission schedule of the transmission packet according to the result of exchanging information with the terminal device 200-2 (reception terminal). As a specific example, the terminal device 200-1 may determine whether or not to drop the packet to be transmitted when it is difficult to satisfy the delay request of the transmission packet or the like. Further, the terminal device 200-1 may stop the continuous transmission and perform the intermittent transmission.
[0112]
　Further, the terminal device 200-1 (transmission terminal) may change the transmission method of the transmission packet according to the result of exchanging information with the terminal device 200-2 (reception terminal). As a specific example, the terminal device 200-1 may change the control of MCS (Modulation Coding Scheme), transmission power, MIMO transmission, and the like. Further, the terminal device 200-1 may perform transmission in a short time by temporarily switching to high data rate communication.
[0113]
　Further, the terminal device 200-1 (transmission terminal) may drop packets according to the conditions of priority and delay request. As a specific example, the terminal device 200-1 compares the priority information of the transmitted / received packet in the terminal device 200-2 (reception terminal) with the priority information of the packet scheduled to be transmitted, and is scheduled to transmit. You may decide whether or not to drop the packet. Further, the terminal device 200-1 may abandon the transmission and drop the packet when it is difficult to satisfy the delay request of the transmission packet.
[0114]
　Further, the terminal device 200-1 (transmitting terminal) instructs the terminal device 200-2 to release the unicast link according to the result of exchanging information with the terminal device 200-2 (receiving terminal). You may. As a specific example, the terminal device 200-1 instructs the terminal device 200-2 to release the unicast link according to the determination result of various priorities (for example, the priority of transmission / reception, etc.). May be good.
[0115]
　Further, the terminal device 200-1 (transmitting terminal) may switch to multi-carrier communication depending on the result of exchanging information with the terminal device 200-2 (receiving terminal). As a specific example, the terminal device 200-1 may switch to multi-carrier communication according to the determination result of various priorities (for example, transmission / reception priority). In this case, the terminal device 200-1 may request the resource configuration to a device having an authority regarding control of side link communication such as a base station 100 or the like.
[0116]
　Further, the terminal device 200-1 (transmission terminal) may change the frequency band (transmission band) used for packet transmission according to the result of exchanging information with the terminal device 200-2 (reception terminal). Good. As a specific example, the terminal device 200-1 may change the frequency band (transmission band) used for packet transmission according to the determination result of various priorities (for example, transmission / reception priority). .. In this case, the terminal device 200-1 may notify the terminal device 200-2, which is the transmission destination of the packet, of information regarding the changed frequency band.
[0117]
　Further, the terminal device 200-1 (transmitting terminal) changes from direct communication with the terminal device 200-2 to a base station according to the result of exchanging information with the terminal device 200-2 (receiving terminal). You may switch to communication via 100 or the like. As a specific example, the terminal device 200-1 switches the communication route with the terminal device 200-2 as described above according to the determination result of various priorities (for example, the priority of transmission / reception, etc.). You may. In this case, the terminal device 200-1 may notify the terminal device 200-2, which is the transmission destination of the packet, of the switching of the communication path. Upon receiving this notification, the terminal device 200-2 may receive the packet transmitted from the terminal device 200-1 via the base station 100. Further, the terminal measure 200-1 may request the device having the authority for controlling the side link communication, such as the base station 100, to switch the link.
[0118]
　Further, the terminal device 200-1 (transmitting terminal) is a resource for the terminal device 200-2 to receive a packet transmitted by itself according to the result of exchanging information with the terminal device 200-2 (receiving terminal). You may make a reservation for. As a specific example, the terminal device 200-1 may reserve the above resources according to the determination results of various priorities (for example, transmission / reception priorities). Specifically, the terminal device 200-1 may parse and transmit packets. In this case, the terminal device 200-1 may instruct the terminal device 200-2 of the resource for the terminal device 200-2 to receive the packet transmitted by the terminal device 200-2. At this time, the terminal device 200-2 may notify the reception acceptance (OK) or rejection (NG) in response to the instruction from the terminal device 200-1. When the terminal device 200-2 notifies (OK) of the above instruction from the terminal device 200-1, the terminal device 200-2 sends a packet transmitted from the terminal device 200-1 via the instructed resource. It will be received.
[0119]
　In the above, an example of correspondence on the terminal device 200-1 side operating as a transmitting terminal has been described. When focusing on the communication between the terminal device 200-1 (transmitting terminal) and the terminal device 200-2 (receiving terminal), the terminal device 200-2 with respect to the terminal measure 200-1 is a "third communication device". Corresponds to an example of. Further, when the terminal device 200-1 operates as a receiving terminal, another terminal device 200 (for example, another terminal device 200 other than the terminal device 200-2) that is a source of the packet is referred to as a "fourth communication device. Corresponds to an example of.
[0120]
　　(2-2) Correspondence of Device Equivalent to Base Station
　Next, an example of correspondence of a device having authority for controlling side link communication such as base station 100 will be described. In this section, for convenience, the case where the base station 100 handles the correspondence will be described, but the description is not limited to the base station 100, and other devices (for example, RSU, relay) having authority regarding control of side link communication. The same shall apply to nodes, relay terminals, and master terminals (reader terminals, etc.) as long as there are no technical discrepancies.
[0121]
　For example, base station 100 may control sidelink resource scheduling. As a specific example, when it is difficult for the base station 100 to satisfy the delay request of the transmission packet or the like, the base station 100 determines whether or not to drop the packet to be transmitted to the terminal device 200-1 (transmission terminal). You may go. Further, the base station 100 may control the terminal device 200-1 to stop continuous transmission and perform intermittent transmission.
[0122]
　Further, the base station 100 may drop the packet on the terminal device 200-1 (transmission terminal) according to the conditions of the priority and the delay request. As a specific example, the base station 100 compares the priority information of the transmitted / received packet in the terminal device 200-2 (receiving terminal) with the priority information of the packet scheduled to be transmitted by the terminal device 200-1 (transmitting terminal). Then, it may be determined whether or not to drop the packet in the terminal device 200-1. Further, the base station 100 may control the terminal device 200-1 to abandon the transmission and drop the packet when it is determined that it is difficult to satisfy the delay request of the transmission packet.
[0123]
　Further, the base station 100 may instruct the terminal device 200-2 (reception terminal) to release the unicast link.
[0124]
　Further, the base station 100 may switch the communication between the terminal device 200-1 (transmission terminal) and the terminal device 200-2 (reception terminal) to multi-carrier communication.
[0125]
　Further, the base station 100 may change the frequency band used for packet transmission between the terminal device 200-1 (transmission terminal) and the terminal device 200-2 (reception terminal). In this case, the base station 100 may notify at least the terminal device 200-2 of the information regarding the changed frequency band.
[0126]
　In the above, an example of correspondence of a device having an authority for controlling side link communication such as a base station 100 and the like has been described.
[0127]
　　(2-3) Correspondence of Terminal Device on Receiving Side
　Next, an example of correspondence on the terminal device 200-2 side operating as a receiving terminal will be described.
[0128]
　For example, the terminal device 200-2 (reception terminal) may control the resource scheduling of the side link according to the result of exchanging information with the terminal device 200-1 (transmission terminal). As a specific example, when it is difficult for the terminal device 200-2 to satisfy the delay request of the transmission packet or the like, the terminal device 200-2 determines whether or not to drop the packet to be transmitted to the terminal device 200-1. May be good. Further, the terminal device 200-2 may cause the terminal device 200-1 to stop continuous transmission and perform intermittent transmission. Further, the terminal device 200-2 (reception terminal) may control the operation related to the transmission of data to another terminal device 200 when operating as a transmission terminal according to its own situation. As a specific example, the terminal device 200-2 (reception terminal) drops a packet scheduled to be transmitted to another terminal device 200 when operating as a transmission terminal under a situation where it is difficult to satisfy the delay request. You may decide whether or not to do so.
[0129]
　Further, the terminal device 200-2 (reception terminal) may drop the packet on the terminal device 200-1 (transmission terminal) according to the conditions of the priority and the delay request. As a specific example, the terminal device 200-2 compares the priority information of the packet scheduled to be transmitted by the terminal device 200-1 (transmission terminal) with the priority information of the packet sent / received by the terminal device 200-1. It may be determined whether or not -1 is allowed to drop the packet to be transmitted. Further, when it is difficult for the terminal device 200-2 to satisfy the delay request of the transmission packet, the terminal device 200-1 may give up the transmission and drop the packet. Further, the terminal device 200-2 (reception terminal) determines whether or not to drop a packet scheduled to be transmitted to another terminal device 200 when operating as a transmission terminal according to the result of the above comparison. May be good.
[0130]
　Further, the terminal device 200-2 (reception terminal) may release the unicast link according to the result of exchanging information with the terminal device 200-1 (transmission terminal). As a specific example, the terminal prosecution 200-2 may release a unicast link with another terminal device 200 that has already been established.
[0131]
　Further, the terminal device 200-2 (reception terminal) may switch to multi-carrier communication depending on the result of exchanging information with the terminal device 200-1 (transmission terminal).
[0132]
　Further, the terminal device 200-2 (reception terminal) has a frequency band (that is, that is) used for communication with the terminal device 200-1 according to the result of exchanging information with the terminal device 200-1 (transmission terminal). , The frequency band for receiving the packet transmitted from the terminal device 200-1) may be changed. In this case, the terminal device 200-2 may acquire information on the changed frequency band from the terminal device 200-1.
[0133]
　Further, the terminal device 200-2 (reception terminal) is a base station from direct communication with the terminal device 200-1 according to the result of exchanging information with the terminal device 200-1 (transmission terminal). You may switch to communication via 100 or the like. In this case, the terminal device 200-2 may recognize the switching of the communication path in response to the notification from the terminal device 200-1.
[0134]
　Further, the terminal device 200-2 (reception terminal) notifies the terminal device 200-1 of the resource capable of receiving the packet according to the result of exchanging information with the terminal device 200-1 (transmission terminal). You may. In this case, the terminal device 200-2 receives the packet transmitted from the terminal device 200-1 via the notified resource. Further, the terminal device 200-2 may notify the terminal device 200-1 of the time when the packet can be received. Further, the terminal device 200-2 may notify the terminal device 200-1 of the region of the time and frequency in which the packet can be received. Further, the terminal device 200-2 may individually instruct or allocate resources capable of receiving the packet to each of the terminal devices 200 scheduled to transmit the packet to itself.
[0135]
　In the above, an example of correspondence on the side of the terminal device 200-2 that operates as a receiving terminal has been described. When focusing on the communication between the terminal device 200-1 (transmitting terminal) and the terminal device 200-2 (receiving terminal), the terminal device 200-1 with respect to the terminal device 200-2 is "the first communication device". Corresponds to an example of. Further, when the terminal device 200-2 operates as a transmitting terminal, another terminal device 200 (for example, another terminal device 200 other than the terminal device 200-1) to which the packet is transmitted is referred to as a “second communication device”. Corresponds to an example of.
[0136]
　　<5.2. Leveling of side-link resources>
　Next, as an example of a technology that can suppress the manifestation of the HD problem, a technology that suppresses the manifestation of the HD problem by leveling the side-link resources will be described.
[0137]
　For example, by dividing the resources to be monitored by the terminal device 200 into levels, the terminal device 200 may control the processing related to packet transmission and reception according to the level set for the target resource. Good. As a specific example, the terminal device 200 may perform reception with higher priority in the resource area in which the higher level is set.
[0138]
　Resource leveling may be implemented for the entire system. In this case, the level may be set by a device having authority for controlling side link communication such as a base station 100 or the like, or may be set by Preconfiguration. Further, the level may be set for each frequency band. Further, the setting of the level may be performed between the terminal devices 200 that perform transmission / reception.
[0139]
　Further, the resource leveling may be set individually for each terminal device 200. In this case, the terminal device 200 may notify other terminal devices 200 located in the vicinity in advance of the information regarding the setting for itself.
[0140]
　Further, as another example, the transmission / reception ratio may be divided into levels. As a specific example, the ratio of outgoing traffic may be leveled for each resource pool.
[0141]
　For example, FIG. 20 is an explanatory diagram for explaining an example of leveling the transmission / reception ratio. In FIG. 20, the horizontal axis represents time and the vertical axis represents frequency. "SLSS" indicates a Sidelink Synchronization Signal. "PBCH" indicates Physical Sidelink Broadcast Channel. “Control” schematically indicates a control channel, and corresponds to, for example, PSCCH (Physical Sidelink Control Channel). “Data” schematically indicates a data channel, and for example, PSSCH (Physical Sidelink Shared Channel) corresponds to it. Of the areas to which resources are allocated, the area to which the control channel is allocated corresponds to an example of the “control area”, and the area to which the data channel is allocated corresponds to an example of the “data area”.
[0142]
　In the example shown in FIG. 20, "Resource pool A" and "Resource pool B" are set as resource pools that can be used for side link communication. Further, in "Resource pool A", "Sub-resource pool A-1" and "Sub-resource pool A-2" are defined as sub-resource pools. Further, in "Resource pool B", "Sub-resource pool B-1" is defined as a sub-resource pool.
[0143]
　Based on such a configuration, for example, different levels may be set for "Resource pool A" and "Resource pool B" in terms of the transmission / reception ratio. As a more specific example, the ratio of unicast may be defined as 90% and the ratio of broadcast may be defined as 10% with respect to "Resource pool A". On the other hand, the ratio of unicast may be defined as 10% and the ratio of broadcast may be defined as 90% with respect to "Resource pool B". Based on such a premise, for example, when the terminal device 200-1 (transmitting terminal) has a unicast packet, there is a 90% probability that the terminal device 200-1 (transmitting terminal) transmits the packet using "Resource pool A". May work to do. Further, the level division of the transmission / reception ratio described above may be set individually for each important level of the packet.
[0144]
　　<5.3. Example>
　Subsequently, an embodiment of the system according to the embodiment of the present disclosure will be described.
[0145]
　　<5.3.1. Example 1:
　First Example of Operation Related to Addition of Unicast Link> First, as Example 1, an example of a process flow for newly adding a unicast link in inter-terminal communication via a side link will be described. .. For example, FIG. 21 is a sequence diagram showing an example of a series of processing flows of the system according to the first embodiment. Specifically, in the example shown in FIG. 21, the terminal device 200-1 (transmitting terminal) and the terminal device 200-2 (receiving terminal) are performing unicast communication (S201), and the terminal device 200- 3 (transmitting terminal) is about to set a new unicast link with the terminal device 200-2 (receiving terminal).
[0146]
　The terminal device 200-2 periodically notifies the surrounding terminal devices 200 (for example, terminal devices 200-1 and 200-3) of its own Capability information (S203). Examples of the Capability information include information such as the number of unicast communication connections that can be made and the number of unicast communication connections that can be made. This makes it possible for each of the terminal devices 200-1 and 200-3 to recognize how much capability the terminal device 200-2 has with respect to communication with the other terminal device 200.
[0147]
　The terminal device 200-3 determines whether or not to execute the unicast communication request to the terminal device 200-2 based on the Capability information notified from the terminal device 200-2 (S205). At this time, the terminal device 200-3 considers, for example, the priority of the packet scheduled to be transmitted to the terminal device 200-2, the traffic volume (for example, the traffic volume of communication via the side link), and the like, and unicasts the terminal device 200-3. It may be determined whether or not to carry out the communication request. In the example shown in FIG. 21, the case where the terminal device 200-3 determines that the terminal device 200-2 is requested to perform unicast communication is shown. That is, the terminal device 200-3 notifies the terminal device 200-2 of information regarding the presence / absence of important data, information regarding the buffer of transmission data, and the like, and requests the terminal device 200-2 for unicast communication. (S207).
[0148]
　When the terminal device 200-2 receives a request for unicast communication from the terminal device 200-3, whether or not to allow the terminal device 200-3 to perform unicast communication based on the above information notified together. Is determined (S209). In the example shown in FIG. 21, the case where the terminal device 200-2 determines that the terminal device 200-3 is permitted to perform unicast communication is shown. That is, the terminal device 200-2 notifies the terminal device 200-3 of the permission of the unicast communication. Further, at this time, the terminal device 200-2 considers the arrival of the packet from the terminal device 200-1 and sends the packet to the terminal device 200-3 by using the resource orthogonal to the terminal device 200-1. A transmission resource may be instructed to transmit (S211).
[0149]
　Upon receiving the notification of permission for unicast communication from the terminal device 200-2, the terminal device 200-3 starts the process related to the unicast communication with the terminal device 200-2 (S213), and the terminal device 200-3 starts the process related to the unicast communication. A link for unicast communication is established with 200-2 (S215). At this time, the terminal device 200-3 establishes a unicast communication link with the terminal device 200-2 so that the packet is transmitted via the transmission resource instructed by the terminal device 200-2. You may go.
[0150]
　As described above, as the first embodiment, an example of the flow of the process of newly adding the unicast link in the inter-terminal communication via the side link has been described with reference to FIG.
[0151]
　　<5.3.2.2. Example 2: Second example of the operation related to the addition of the unicast link>
　Subsequently, as the second embodiment, another example of the flow of the process of newly adding the unicast link in the inter-terminal communication via the side link. Will be described. For example, FIG. 22 is a sequence diagram showing an example of a series of processing flows of the system according to the second embodiment. Specifically, in the example shown in FIG. 22, as in the example shown in FIG. 21, the terminal device 200-1 (transmitting terminal) and the terminal device 200-2 (receiving terminal) are performing unicast communication. In (S251), the terminal device 200-3 (transmitting terminal) is about to set a new unicast link with the terminal device 200-2 (receiving terminal). In FIG. 22, the processes shown by reference numerals S251 to S257 are substantially the same as the processes shown by reference numerals S201 to S207 in the example shown in FIG. 21, and detailed description thereof will be omitted.
[0152]
　When the terminal device 200-2 receives a request for unicast communication from the terminal device 200-3, whether or not to allow the terminal device 200-3 to perform unicast communication based on the above information notified at the same time. Is determined (S209). In the example shown in FIG. 22, an example is shown in which the terminal device 200-2 preferentially communicates with the terminal device 200-3 over the terminal device 200-1.
[0153]
　Specifically, in the example shown in FIG. 22, the terminal device 200-2 instructs the terminal device 200-1 to release the unicast communication (S261). Upon receiving the instruction from the terminal device 200-2, the terminal device 200-1 releases the unicast communication with the terminal device 200-2 (S263).
[0154]
　Next, the terminal device 200-2 notifies the terminal device 200-3 of the permission of the unicast communication (S265).
[0155]
　Upon receiving the notification of permission for unicast communication from the terminal device 200-2, the terminal device 200-3 starts the process related to the unicast communication with the terminal device 200-2 (S267), and the terminal device 200-3 starts the process related to the unicast communication. A link for unicast communication is established with 200-2 (S269).
[0156]
　Here, an example of a series of processing flows of the terminal device 200-3 (transmission terminal) will be described with reference to FIG. 23. FIG. 23 is a flowchart showing an example of a series of processing flows of the terminal device 200-3 operating as a transmitting terminal in the system according to the second embodiment.
[0157]
　As shown in FIG. 23, when the unicast communication traffic is generated (S301), the terminal device 200-3 determines whether or not to execute the unicast communication request to the terminal device 200-2 (reception terminal). to decide. The terminal device 200-3 requests the terminal device 200-2 for unicast communication according to the result of the above determination, and the unicast communication is performed in response to the response from the terminal device 200-2. It is determined whether or not it is possible (S303).
[0158]
　When unicast communication is permitted from the terminal device 200-2 (S305, YES), the terminal device 200-3 confirms whether or not the resource to be used for communication is specified from the terminal device 200-2. (S305). When a resource is specified from the terminal device 200-2 (S305, YES), the terminal device 200-3 uses the specified resource for communication with the terminal device 200-2. Control (S307). On the other hand, when the resource is not specified from the terminal device 200-2 (S305, NO), the terminal device 200-3 does not specify the resource and is connected to the terminal device 200-2. Communication is controlled (S309). As described above, the terminal device 200-3 establishes unicast communication with the terminal device 200-2 (S311).
[0159]
　On the other hand, when unicast communication is not permitted from the terminal device 200-2 (S305, NO), the terminal device 200-3 establishes the unicast communication with the terminal device 200-2. Ends a series of processes without doing so. In this case, the terminal device 200-3 communicates with the terminal device 200-2 by using means other than unicast communication (for example, communication via the base station 100). You may go.
[0160]
　Next, with reference to FIG. 24, an example of a series of processing flows of the terminal device 200-2 (reception terminal) will be described. FIG. 24 is a flowchart showing an example of a series of processing flows of the terminal device 200-2 that operates as a receiving terminal in the system according to the second embodiment.
[0161]
　When the terminal device 200-2 receives a request for unicast communication from the terminal device 200-3 (transmitting terminal) (S351), the terminal device 200-2 determines whether or not to allow the unicast communication to the terminal device 200-3. (S353).
[0162]
　When the terminal device 200-2 determines that the terminal device 200-3 is permitted to perform unicast communication (S355, YES), it is necessary to specify a resource for the terminal device 200-3 to transmit a packet. Whether or not it is determined (S359). When it is determined that it is necessary to specify the resource (S359, YES), the terminal device 200-2 specifies the resource to be used for transmitting the packet to the terminal device 200-3 (S361). On the other hand, when it is determined that the resource specification is unnecessary (S359, NO), the terminal device 200-2 does not have to specify the resource to be used for packet transmission to the terminal device 200-3. .. Then, the terminal device 200-2 notifies the terminal device 200-3 of the permission of the unicast communication, and establishes the unicast communication with the terminal device 200-3 (S363).
[0163]
　On the other hand, if the terminal device 200-2 determines that the terminal device 200-3 is not allowed to perform unicast communication (S355, NO), the terminal device 200-3 cannot perform unicast communication. Notify that there is (S357).
[0164]
　As described above, as the second embodiment, another example of the flow of the process of newly adding the unicast link in the inter-terminal communication via the side link has been described with reference to FIGS. 22 to 24.
[0165]
　　<5.3.3. Example 3: Third Example of Operation Related to Addition of Unicast Link>
　Subsequently, as Example 3, another example of the flow of processing for newly adding a unicast link in inter-terminal communication via a side link. Will be described. For example, FIG. 25 is a sequence diagram showing an example of a series of processing flows of the system according to the third embodiment. Specifically, in the example shown in FIG. 25, similarly to the example shown in FIG. 21, the terminal device 200-1 (transmitting terminal) and the terminal device 200-2 (receiving terminal) are performing unicast communication. In (S251), the terminal device 200-3 (transmitting terminal) is about to set a new unicast link with the terminal device 200-2 (receiving terminal). In FIG. 25, the processes shown by reference numerals S401 to S407 are substantially the same as the processes shown by reference numerals S201 to S207 in the example shown in FIG. 21, and detailed description thereof will be omitted.
[0166]
　When the terminal device 200-2 receives a request for unicast communication from the terminal device 200-3, whether or not to allow the terminal device 200-3 to perform unicast communication based on the above information notified at the same time. Is determined (S409). In the example shown in FIG. 25, an example is shown in which the terminal device 200-2 preferentially communicates with the terminal device 200-1 over the terminal device 200-3. Therefore, the terminal device 200-2 notifies the terminal device 200-3 that unicast communication is not possible (S411).
[0167]
　Upon receiving a notification from the terminal device 200-2 that the unicast communication is not possible, the terminal device 200-3 indicates that the side link unicast transmission is not possible to the terminal device 200-2. recognize. In this case, the terminal device 200-3 determines whether or not to switch to communication via the base station 100 (communication via the Uu link) (S413). In the example shown in FIG. 25, an example is shown in which the terminal device 200-3 determines that the communication with the terminal device 200-2 is switched to the communication via the base station 100.
[0168]
　Specifically, in the example shown in FIG. 25, the terminal device 200-3 requests the base station 100 to switch to Uu-link communication for communication with the terminal device 200-2. At this time, the terminal device 200-3 transmits the data to be transmitted to the terminal device 200-2 and the destination information of the data (that is, the information of the terminal device 200-2) to the base station 100 (S415).
[0169]
　In response to a request from the terminal device 200-3, the base station 100 schedules communication between the terminal device 200-3 and the terminal device 200-2 via the Uu link (S417). Then, the base station 100 transfers the data transmitted from the terminal device 200-3 to the terminal device 200-2 based on the destination information notified from the terminal device 200-3 (S419).
[0170]
　As described above, as the third embodiment, another example of the flow of the process of newly adding the unicast link in the inter-terminal communication via the side link has been described with reference to FIG. 25.
[0171]
　<< 6. Application example >>
　The technology according to the present disclosure can be applied to various products. For example, the base station 100 may be realized as an eNB (evolved Node B) of any kind such as a macro eNB or a small eNB. The small eNB may be an eNB that covers cells smaller than the macro cell, such as a pico eNB, a micro eNB, or a home (femto) eNB. Instead, the base station 100 may be realized as another type of base station such as NodeB or BTS (Base Transceiver Station). The base station 100 may include a main body (also referred to as a base station device) that controls wireless communication, and one or more RRHs (Remote Radio Heads) that are arranged at a location different from the main body. Further, various types of terminals, which will be described later, may operate as the base station 100 by temporarily or semi-permanently executing the base station function.
[0172]
　Further, for example, the terminal device 200 or 300 may be a smartphone, a tablet PC (Personal Computer), a notebook PC, a portable game terminal, a mobile terminal such as a portable / dongle type mobile router or a digital camera, or a car navigation device. It may be realized as an in-vehicle terminal. Further, the terminal device 200 or 300 may be realized as a terminal (also referred to as an MTC (Machine Type Communication) terminal) that performs M2M (Machine To Machine) communication. Further, the terminal device 200 or 300 may be a wireless communication module (for example, an integrated circuit module composed of one base station 100 die) mounted on these terminals.
[0173]
　　<6.1. Application Example Regarding Base Station>
　　　(First Application Example)
　FIG. 26 is a block diagram showing a first example of a schematic configuration of an eNB to which the technique according to the present disclosure can be applied. The eNB 800 has one or more antennas 810 and a base station device 820. Each antenna 810 and base station device 820 may be connected to each other via an RF cable.
[0174]
　Each of the antennas 810 has a single antenna element or a plurality of antenna elements (for example, a plurality of antenna elements constituting a MIMO antenna) and is used for transmitting and receiving a radio signal by the base station apparatus 820. The eNB 800 has a plurality of antennas 810 as shown in FIG. 26, and the plurality of antennas 810 may correspond to a plurality of frequency bands used by the eNB 800, for example. Although FIG. 26 shows an example in which the eNB 800 has a plurality of antennas 810, the eNB 800 may have a single antenna 810.
[0175]
　The base station apparatus 820 includes a controller 821, a memory 822, a network interface 823, and a wireless communication interface 825.
[0176]
　The controller 821 may be, for example, a CPU or a DSP, and operates various functions of the upper layer of the base station apparatus 820. For example, the controller 821 generates a data packet from the data in the signal processed by the wireless communication interface 825, and transfers the generated packet via the network interface 823. The controller 821 may generate a bundled packet by bundling data from a plurality of baseband processors and transfer the generated bundled packet. Further, the controller 821 is a logic that executes control such as radio resource control (Radio Resource Control), radio bearer control (Radio Bearer Control), mobility management (Mobility Management), inflow control (Admission Control), or scheduling (Scheduling). Function. Further, the control may be executed in cooperation with the surrounding eNB or the core network node. The memory 822 includes a RAM and a ROM, and stores a program executed by the controller 821 and various control data (for example, a terminal list, transmission power data, scheduling data, and the like).
[0177]
　The network interface 823 is a communication interface for connecting the base station apparatus 820 to the core network 824. Controller 821 may communicate with a core network node or other eNB via network interface 823. In that case, the eNB 800 and the core network node or other eNB may be connected to each other by a logical interface (for example, S1 interface or X2 interface). The network interface 823 may be a wired communication interface or a wireless communication interface for a wireless backhaul. When the network interface 823 is a wireless communication interface, the network interface 823 may use a frequency band higher than the frequency band used by the wireless communication interface 825 for wireless communication.
[0178]
　The wireless communication interface 825 supports either a cellular communication method such as LTE (Long Term Evolution) or LTE-Advanced, and provides a wireless connection to a terminal located in the cell of the eNB 800 via the antenna 810. The wireless communication interface 825 may typically include a baseband (BB) processor 826, an RF circuit 827, and the like. The BB processor 826 may perform, for example, coding / decoding, modulation / demodulation, and multiplexing / demultiplexing, and may perform each layer (for example, L1, MAC (Medium Access Control), RLC (Radio Link Control), and PDCP. (Packet Data Convergence Protocol)) Performs various signal processing. The BB processor 826 may have some or all of the above-mentioned logical functions instead of the controller 821. The BB processor 826 may be a module including a memory for storing a communication control program, a processor for executing the program, and related circuits, and the function of the BB processor 826 may be changed by updating the above program. Good. Further, the module may be a card or a blade inserted into the slot of the base station apparatus 820, or may be a chip mounted on the card or the blade. On the other hand, the RF circuit 827 may include a mixer, a filter, an amplifier, and the like, and transmits and receives radio signals via the antenna 810.
[0179]
　The wireless communication interface 825 includes a plurality of BB processors 826 as shown in FIG. 26, and the plurality of BB processors 826 may correspond to a plurality of frequency bands used by, for example, the eNB 800. Further, the wireless communication interface 825 includes a plurality of RF circuits 827 as shown in FIG. 26, and the plurality of RF circuits 827 may correspond to, for example, a plurality of antenna elements. Although FIG. 26 shows an example in which the wireless communication interface 825 includes a plurality of BB processors 826 and a plurality of RF circuits 827, the wireless communication interface 825 includes a single BB processor 826 or a single RF circuit 827. It may be.
[0180]
　In the eNB 800 shown in FIG. 26, one or more components included in the base station 100 described with reference to FIG. 2 (for example, at least one of a communication control unit 151, an information acquisition unit 153, and a notification unit 155). May be implemented in the wireless communication interface 825. Alternatively, at least some of these components may be implemented in controller 821. As an example, the eNB 800 may include a module including a part (for example, a BB processor 826) or all of the wireless communication interface 825 and / or a controller 821, and the module may be equipped with one or more of the above components. Good. In this case, the module stores a program for causing the processor to function as the one or more components (in other words, a program for causing the processor to execute the operation of the one or more components). You may run the program. As another example, even if a program for making the processor function as one or more of the above components is installed in the eNB 800 and the wireless communication interface 825 (eg, BB processor 826) and / or the controller 821 executes the program. Good. As described above, the eNB 800, the base station device 820, or the module may be provided as a device including the one or more components, and a program for making the processor function as the one or more components is provided. You may. Further, a readable recording medium on which the above program is recorded may be provided.
[0181]
　Further, in the eNB 800 shown in FIG. 26, the wireless communication unit 120 described with reference to FIG. 2 may be mounted on the wireless communication interface 825 (for example, RF circuit 827). Further, the antenna unit 110 may be mounted on the antenna 810. Further, the network communication unit 130 may be implemented in the controller 821 and / or the network interface 823. Further, the storage unit 140 may be mounted in the memory 822.
[0182]
　　　(Second Application Example)
　FIG. 27 is a block diagram showing a second example of a schematic configuration of an eNB to which the technique according to the present disclosure can be applied. The eNB 830 has one or more antennas 840, a base station device 850, and an RRH860. Each antenna 840 and RRH860 may be connected to each other via an RF cable. Further, the base station apparatus 850 and RRH860 may be connected to each other by a high-speed line such as an optical fiber cable.
[0183]
　Each of the antennas 840 has a single or multiple antenna elements (eg, a plurality of antenna elements constituting a MIMO antenna) and is used for transmitting and receiving radio signals by the RRH860. The eNB 830 has a plurality of antennas 840 as shown in FIG. 27, and the plurality of antennas 840 may correspond to a plurality of frequency bands used by the eNB 830, for example. Although FIG. 27 shows an example in which the eNB 830 has a plurality of antennas 840, the eNB 830 may have a single antenna 840.
[0184]
　The base station apparatus 850 includes a controller 851, a memory 852, a network interface 853, a wireless communication interface 855, and a connection interface 857. The controller 851, memory 852, and network interface 853 are similar to the controller 821, memory 822, and network interface 823 described with reference to FIG.
[0185]
　The wireless communication interface 855 supports either a cellular communication method such as LTE or LTE-Advanced, and provides a wireless connection to terminals located in the sector corresponding to the RRH860 via the RRH860 and the antenna 840. The wireless communication interface 855 may typically include a BB processor 856 and the like. The BB processor 856 is similar to the BB processor 826 described with reference to FIG. 26, except that it is connected to the RF circuit 864 of the RRH860 via the connection interface 857. The wireless communication interface 855 includes a plurality of BB processors 856 as shown in FIG. 27, and the plurality of BB processors 856 may correspond to a plurality of frequency bands used by, for example, the eNB 830. Although FIG. 27 shows an example in which the wireless communication interface 855 includes a plurality of BB processors 856, the wireless communication interface 855 may include a single BB processor 856.
[0186]
　The connection interface 857 is an interface for connecting the base station device 850 (wireless communication interface 855) to the RRH860. The connection interface 857 may be a communication module for communication on the high-speed line that connects the base station apparatus 850 (wireless communication interface 855) and the RRH860.
[0187]
　The RRH860 also includes a connection interface 861 and a wireless communication interface 863.
[0188]
　The connection interface 861 is an interface for connecting the RRH860 (wireless communication interface 863) to the base station device 850. The connection interface 861 may be a communication module for communication on the high-speed line.
[0189]
　The wireless communication interface 863 transmits and receives wireless signals via the antenna 840. The wireless communication interface 863 may typically include RF circuits 864 and the like. The RF circuit 864 may include a mixer, a filter, an amplifier, and the like, and transmits and receives radio signals via the antenna 840. As shown in FIG. 27, the wireless communication interface 863 includes a plurality of RF circuits 864, and the plurality of RF circuits 864 may correspond to, for example, a plurality of antenna elements. Although FIG. 27 shows an example in which the wireless communication interface 863 includes a plurality of RF circuits 864, the wireless communication interface 863 may include a single RF circuit 864.
[0190]
　In the eNB 830 shown in FIG. 27, one or more components included in the base station 100 described with reference to FIG. 2 (for example, at least one of a communication control unit 151, an information acquisition unit 153, and a notification unit 155). May be implemented in wireless communication interface 855 and / or wireless communication interface 863. Alternatively, at least some of these components may be implemented in controller 851. As an example, the eNB 830 may include a module including a part (for example, BB processor 856) or all of the wireless communication interface 855 and / or a controller 851, and the module may be equipped with one or more of the above components. Good. In this case, the module stores a program for causing the processor to function as the one or more components (in other words, a program for causing the processor to execute the operation of the one or more components). You may run the program. As another example, even if a program for making the processor function as one or more of the above components is installed in the eNB 830 and the wireless communication interface 855 (eg, BB processor 856) and / or the controller 851 executes the program. Good. As described above, the eNB 830, the base station device 850, or the module may be provided as a device including the one or more components, and a program for making the processor function as the one or more components is provided. You may. Further, a readable recording medium on which the above program is recorded may be provided.
[0191]
　Further, in the eNB 830 shown in FIG. 27, for example, the wireless communication unit 120 described with reference to FIG. 2 may be mounted on the wireless communication interface 863 (for example, RF circuit 864). Further, the antenna unit 110 may be mounted on the antenna 840. Further, the network communication unit 130 may be implemented in the controller 851 and / or the network interface 853. Further, the storage unit 140 may be mounted in the memory 852.
[0192]
　　<6.2. Application Example Regarding Terminal Device>
　　　(First Application Example)
　FIG. 28 is a block diagram showing an example of a schematic configuration of a smartphone 900 to which the technology according to the present disclosure can be applied. The smartphone 900 includes a processor 901, a memory 902, a storage 903, an external connection interface 904, a camera 906, a sensor 907, a microphone 908, an input device 909, a display device 910, a speaker 911, a wireless communication interface 912, and one or more antenna switches 915. It comprises one or more interfaces 916, bus 917, battery 918 and auxiliary controller 919.
[0193]
　The processor 901 may be, for example, a CPU or a SoC (System on Chip), and controls the functions of the application layer and other layers of the smartphone 900. Memory 902 includes RAM and ROM and stores programs and data executed by processor 901. The storage 903 may include a storage medium such as a semiconductor memory or a hard disk. The external connection interface 904 is an interface for connecting an external device such as a memory card or a USB (Universal Serial Bus) device to the smartphone 900.
[0194]
　The camera 906 has an image pickup device such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor), and generates an captured image. The sensor 907 may include, for example, a group of sensors such as a positioning sensor, a gyro sensor, a geomagnetic sensor and an acceleration sensor. The microphone 908 converts the voice input to the smartphone 900 into a voice signal. The input device 909 includes, for example, a touch sensor, a keypad, a keyboard, a button, or a switch for detecting a touch on the screen of the display device 910, and receives an operation or information input from the user. The display device 910 has a screen such as a liquid crystal display (LCD) or an organic light emitting diode (OLED) display, and displays an output image of the smartphone 900. The speaker 911 converts the voice signal output from the smartphone 900 into voice.
[0195]
　The wireless communication interface 912 supports any cellular communication method such as LTE or LTE-Advanced and performs wireless communication. The wireless communication interface 912 may typically include a BB processor 913, an RF circuit 914, and the like. The BB processor 913 may perform, for example, coding / decoding, modulation / demodulation, multiplexing / demultiplexing, and the like, and performs various signal processing for wireless communication. On the other hand, the RF circuit 914 may include a mixer, a filter, an amplifier, and the like, and transmits and receives radio signals via the antenna 916. The wireless communication interface 912 may be a one-chip module in which a BB processor 913 and an RF circuit 914 are integrated. The wireless communication interface 912 may include a plurality of BB processors 913 and a plurality of RF circuits 914 as shown in FIG. 28. Although FIG. 28 shows an example in which the wireless communication interface 912 includes a plurality of BB processors 913 and a plurality of RF circuits 914, the wireless communication interface 912 includes a single BB processor 913 or a single RF circuit 914. It may be.
[0196]
　Further, the wireless communication interface 912 may support other types of wireless communication systems such as a short-range wireless communication system, a proximity wireless communication system, or a wireless LAN (Local Area Network) system, in addition to the cellular communication system. In that case, the BB processor 913 and the RF circuit 914 for each wireless communication system may be included.
[0197]
　Each of the antenna switches 915 switches the connection destination of the antenna 916 between a plurality of circuits included in the wireless communication interface 912 (for example, circuits for different wireless communication methods).
[0198]
　Each of the antennas 916 has a single or multiple antenna elements (eg, a plurality of antenna elements constituting a MIMO antenna) and is used for transmitting and receiving radio signals by the wireless communication interface 912. The smartphone 900 may have a plurality of antennas 916 as shown in FIG. 28. Although FIG. 28 shows an example in which the smartphone 900 has a plurality of antennas 916, the smartphone 900 may have a single antenna 916.
[0199]
　Further, the smartphone 900 may be provided with an antenna 916 for each wireless communication method. In that case, the antenna switch 915 may be omitted from the configuration of the smartphone 900.
[0200]
　The bus 917 connects the processor 901, the memory 902, the storage 903, the external connection interface 904, the camera 906, the sensor 907, the microphone 908, the input device 909, the display device 910, the speaker 911, the wireless communication interface 912, and the auxiliary controller 919 to each other. .. The battery 918 supplies electric power to each block of the smartphone 900 shown in FIG. 28 via a power supply line partially shown by a broken line in the figure. The auxiliary controller 919 operates the minimum necessary functions of the smartphone 900, for example, in the sleep mode.
[0201]
　In the smartphone 900 shown in FIG. 28, at least one of one or more components (for example, communication control unit 241, information acquisition unit 243, and notification unit 247) included in the terminal device 200 described with reference to FIG. ) May be implemented in the wireless communication interface 912. Alternatively, at least some of these components may be implemented in processor 901 or auxiliary controller 919. As an example, the smartphone 900 includes a module including a part (for example, BB processor 913) or all of the wireless communication interface 912, a processor 901, and / or an auxiliary controller 919, and one or more of the above-mentioned components in the module. May be implemented. In this case, the module stores a program for causing the processor to function as the one or more components (in other words, a program for causing the processor to execute the operation of the one or more components). You may run the program. As another example, a program for making the processor function as one or more of the above components is installed in the smartphone 900, the wireless communication interface 912 (eg, BB processor 913), the processor 901, and / or the auxiliary controller 919. You may run the program. As described above, the smartphone 900 or the module may be provided as a device including the one or more components, and a program for making the processor function as the one or more components may be provided. Further, a readable recording medium on which the above program is recorded may be provided.
[0202]
　Further, in the smartphone 900 shown in FIG. 28, for example, the wireless communication unit 220 described with reference to FIG. 3 may be mounted on the wireless communication interface 912 (for example, RF circuit 914). Further, the antenna unit 210 may be mounted on the antenna 916. Further, the storage unit 230 may be mounted in the memory 902.
[0203]
　　　(Second Application Example)
　FIG. 29 is a block diagram showing an example of a schematic configuration of a car navigation device 920 to which the technique according to the present disclosure can be applied. The car navigation device 920 includes a processor 921, a memory 922, a GPS (Global Positioning System) module 924, a sensor 925, a data interface 926, a content player 927, a storage medium interface 928, an input device 929, a display device 930, a speaker 931, and wireless communication. It comprises an interface 933, one or more antenna switches 936, one or more antennas 937, and a battery 938.
[0204]
　The processor 921 may be, for example, a CPU or SoC, and controls the navigation function and other functions of the car navigation device 920. Memory 922 includes RAM and ROM and stores programs and data executed by processor 921.
[0205]
　The GPS module 924 uses GPS signals received from GPS satellites to measure the position (eg, latitude, longitude and altitude) of the car navigation device 920. The sensor 925 may include, for example, a group of sensors such as a gyro sensor, a geomagnetic sensor and a barometric pressure sensor. The data interface 926 is connected to the vehicle-mounted network 941 via a terminal (not shown), and acquires data generated on the vehicle side such as vehicle speed data.
[0206]
　The content player 927 reproduces the content stored in the storage medium (for example, a CD or DVD) inserted into the storage medium interface 928. The input device 929 includes, for example, a touch sensor, a button, or a switch that detects a touch on the screen of the display device 930, and accepts an operation or information input from the user. The display device 930 has a screen such as an LCD or an OLED display, and displays an image of a navigation function or a content to be reproduced. The speaker 931 outputs the sound of the navigation function or the content to be played.
[0207]
　The wireless communication interface 933 supports any cellular communication method such as LTE or LTE-Advanced and performs wireless communication. The wireless communication interface 933 may typically include a BB processor 934, an RF circuit 935, and the like. The BB processor 934 may perform, for example, coding / decoding, modulation / demodulation, multiplexing / demultiplexing, and the like, and performs various signal processing for wireless communication. On the other hand, the RF circuit 935 may include a mixer, a filter, an amplifier, and the like, and transmits and receives radio signals via the antenna 937. The wireless communication interface 933 may be a one-chip module in which a BB processor 934 and an RF circuit 935 are integrated. The wireless communication interface 933 may include a plurality of BB processors 934 and a plurality of RF circuits 935 as shown in FIG. Although FIG. 29 shows an example in which the wireless communication interface 933 includes a plurality of BB processors 934 and a plurality of RF circuits 935, the wireless communication interface 933 includes a single BB processor 934 or a single RF circuit 935. It may be.
[0208]
　Further, the wireless communication interface 933 may support other types of wireless communication systems such as a short-range wireless communication system, a proximity wireless communication system, or a wireless LAN system in addition to the cellular communication system. A BB processor 934 and an RF circuit 935 for each communication method may be included.
[0209]
　Each of the antenna switches 936 switches the connection destination of the antenna 937 between a plurality of circuits included in the wireless communication interface 933 (for example, circuits for different wireless communication methods).
[0210]
　Each of the antennas 937 has a single or multiple antenna elements (eg, a plurality of antenna elements constituting a MIMO antenna) and is used for transmitting and receiving radio signals by the wireless communication interface 933. The car navigation device 920 may have a plurality of antennas 937 as shown in FIG. 29. Although FIG. 29 shows an example in which the car navigation device 920 has a plurality of antennas 937, the car navigation device 920 may have a single antenna 937.
[0211]
　Further, the car navigation device 920 may be provided with an antenna 937 for each wireless communication system. In that case, the antenna switch 936 may be omitted from the configuration of the car navigation device 920.
[0212]
　The battery 938 supplies electric power to each block of the car navigation device 920 shown in FIG. 29 via a power supply line partially shown by a broken line in the figure. In addition, the battery 938 stores electric power supplied from the vehicle side.
[0213]
　In the car navigation device 920 shown in FIG. 29, one or more components (for example, communication control unit 241 and information acquisition unit) included in the terminal device 200 described with reference to FIG. 3 described with reference to FIG. At least one of 243 and notification unit 247) may be implemented in the wireless communication interface 933. Alternatively, at least some of these components may be implemented in processor 921. As an example, the car navigation device 920 includes a module including a part (for example, BB processor 934) or all and / or a processor 921 of the wireless communication interface 933, in which one or more of the above components are mounted. You may. In this case, the module stores a program for causing the processor to function as the one or more components (in other words, a program for causing the processor to execute the operation of the one or more components). You may run the program. As another example, a program for making the processor function as one or more of the above components is installed in the car navigation device 920, and the wireless communication interface 933 (eg, BB processor 934) and / or the processor 921 executes the program. You may. As described above, the car navigation device 920 or the module may be provided as a device including the one or more components, or a program for making the processor function as the one or more components may be provided. Good. Further, a readable recording medium on which the above program is recorded may be provided.
[0214]
　Further, in the car navigation device 920 shown in FIG. 29, for example, the wireless communication unit 220 described with reference to FIG. 3 may be mounted on the wireless communication interface 933 (for example, RF circuit 935). Further, the antenna unit 210 may be mounted on the antenna 937. Further, the storage unit 230 may be mounted in the memory 922.
[0215]
　Further, the technique according to the present disclosure may be realized as an in-vehicle system (or vehicle) 940 including one or more blocks of the car navigation device 920 described above, an in-vehicle network 941, and a vehicle-side module 942. The vehicle-side module 942 generates vehicle-side data such as vehicle speed, engine speed, or failure information, and outputs the generated data to the vehicle-mounted network 941.
[0216]
　<< 6. Conclusion As
　described above, in the system according to the embodiment of the present disclosure, among the communication devices (terminal device 200) that perform inter-device communication, the communication device corresponding to the receiving terminal is the communication unit that performs wireless communication. , It includes an acquisition unit that acquires information from the first communication device, and a control unit that controls communication with the other communication device. Specifically, the acquisition unit obtains the first information regarding the data transmission condition using the communication method in which transmission and reception are time-division-multiplexed to perform inter-device communication, to another communication device via the wireless communication. Get from. Further, the control unit controls the operation related to the reception of the data transmitted from the other communication device according to the first information. Further, the communication device corresponding to the transmission terminal includes a communication unit that performs wireless communication, a notification unit that notifies information to the other communication device, and a control unit that controls communication with the other communication device. Specifically, the notification unit transmits the first information regarding the data transmission condition using the communication method in which transmission and reception are time-division-multiplexed to perform inter-device communication, to another communication device via the wireless communication. Notify to. In addition, the control unit controls the operation related to the transmission of data to the other communication device after the notification of the first information.
[0217]
　With the above configuration, according to the system according to the embodiment of the present disclosure, even in a situation where unicast communication is supported in inter-device communication such as V2X communication, conventional V2X communication can be achieved. In comparison, it is possible to further suppress the manifestation of the HD problem.
[0218]
　Although the preferred embodiments of the present disclosure have been described in detail with reference to the accompanying drawings, the technical scope of the present disclosure is not limited to such examples. It is clear that anyone with ordinary knowledge in the technical field of the present disclosure may come up with various modifications or modifications within the scope of the technical ideas set forth in the claims. Is, of course, understood to belong to the technical scope of the present disclosure.
[0219]
　As a specific example, the technique according to the present disclosure can be applied not only to V2X communication but also to communication between so-called terminal devices such as communication via a side link. Specific examples of the communication include D2D communication, MTC communication and the like. It can also be applied to so-called moving cells, relay communications, and the like. Further, although the above description has mainly focused on the Mode4 resource allocation method, it may be applied to the Mode3 resource allocation method. Further, as described above, the method is mainly described as a method for the FDM type resource pool, but it can also be applied to the TDM type resource pool. In this case, for example, in the part describing the frequency direction and the time direction, the frequency direction and the time direction shall be appropriately read. Further, the technique according to the present disclosure may be applied to multi-carrier communication in which side-link communication is performed using a plurality of carriers. It can also be applied to non-ground station communication using satellites, drones, etc. as devices such as base stations. Further, the technique according to the present disclosure may be applied to side link communication in relay communication such as IAB (Integrated Access and Backhaul link). It may also be applied to a Vehicle tethering use case in which a vehicle stands between a base station and a user terminal around the vehicle and serves as a relay terminal. In this case, for example, a communication link between the car and a peripheral user terminal may be established by a side link, and the technique related to the present disclosure may be applied.
[0220]
　In addition, the effects described herein are merely explanatory or exemplary and are not limited. That is, the techniques according to the present disclosure may exhibit other effects apparent to those skilled in the art from the description herein, in addition to or in place of the above effects.
[0221]
　The following configurations also belong to the technical scope of the present disclosure.
(1) 　First information regarding data transmission conditions using
　a communication unit that performs wireless communication and a communication
method that switches between transmission and reception in a time-division manner to perform inter-device communication is first transmitted via the wireless communication. A communication device including an acquisition unit acquired from the communication device of
　No. 1 and a control unit for controlling an operation related to reception of data transmitted from the first communication device according to the first information
　.
(2) The
　control unit controls an operation related to data transmission to the second communication device according to the first information and a situation regarding data transmission or reception in the communication method. The communication device according to (1) above.
(3) The
　control unit drops a packet to be transmitted to the second communication device according to the first information and the situation regarding transmission or reception of data in the communication method. The communication device according to 2).
(4) The
　control unit compares the priority of the packet transmitted from the first communication device according to the first information with the priority of the packet scheduled to be transmitted to the second communication device. The communication device according to (3) above, which drops a packet scheduled to be transmitted to the second communication device based on the above.
(5)
　The control unit releases a unicast wireless link established between the first information and the second communication device depending on the situation regarding the transmission or reception of data in the communication method. The communication device according to (2) above.
(6) The
　acquisition unit acquires a second information including at least information regarding the presence or absence of important data included in the first information, which is notified via the first sub-area in the area to which the resource is allocated. Then, the
　control unit determines whether or not to receive the data transmitted from the first communication device based on the second information, according to any one of the
　above (2) to (5). The communication device described.
(7)
　The second information includes information about a second partial region different from the first partial region, and the
　acquisition unit passes through the second partial region based on the second information.
　The communication device according to (6) above , which acquires information other than the information notified as the second information among the first information notified by the user.
(8)
　Based on the second information, the control unit gives priority to receiving data transmitted from the first communication device or transmitting data to the second communication device. The communication device according to (6) or (7) above.
(9)
　The control unit controls a route related to reception of data transmitted from the first communication device according to the first information and a situation regarding transmission or reception of data in the communication method. The communication device according to any one of (1) to (8) above.
(10) The
　control unit
　　determines whether or not to allow the first communication device to transmit data based on the first information,
　　and according to the result of the determination, the first communication device.
　The communication device according to any one of (1) to (9) above , which controls the data transmitted from the device to be received .
(11)
　The first communication device is provided with a notification unit for notifying information according to the result of determination of whether or not to permit transmission of data, and the
　control unit notifies information according to the result of the determination. The communication device according to
　(10) above , which is later controlled so that data transmitted from the first communication device is received .
(12)
　A notification unit for notifying the first communication device of third information regarding data reception is provided, and the
　acquisition unit is provided with the first communication device from the first communication device after the notification of the third information. The
　communication device according to any one of (1) to (11) above , which acquires the information of .
(13)
　The third information includes
　　information on the number of receiving antennas and
　　Information about devices related to
　　data reception, information about resource pools available for receiving data, information
　　about processing related to data transmission, information about processing related to
　　data reception, and information
　　about resources that can receive data. 　The communication device according to (12) above
　, which includes information and at least one of them
.
(14)
　The first information includes information
　　on a buffer of transmission data in the first communication device, information on
　　a future transmission schedule by the first communication device, and
　　a type of packet related to transmission of the data. and information about,
　　the information regarding the reception deadline of the packet according to the transmission of the data,
　　information about the priority of the packet according to the transmission of the data,
　　and information as to whether or not important data,
　including at least one of,
　the The communication device according to any one of (1) to (13).
(15)
　The communication device according to any one of (1) to (14), further comprising a notification unit for notifying the first communication device of information about a resource capable of receiving data.
(16) 　The first information regarding the data transmission condition using the
　communication unit that performs wireless communication and the
communication method that switches between transmission and reception in a time-division manner to perform inter-device communication is transmitted to the third via the wireless communication. A communication device including a notification unit that notifies the communication device of the
　above,
　and a control unit that controls an operation related to transmission of data to the third communication device after the notification of the first information .
(17)
　After the notification of the first information, the control unit transmits data to the third communication device and receives data transmitted from the fourth communication device according to a predetermined condition. The communication device according to (16) above, which controls the priority between.
(18) The
　control unit sets the
　　priority as
　　the type of communication traffic,
　　the position information of at least one of the communication device, the third communication device, and the fourth communication device, and a
　　channel. The 　communication device according to (17) above 　　, which is controlled based on at least one of the degree of congestion and
　　the occupancy rate of the channel . (19) 　Any of the above (16) to (18), wherein the control unit drops a packet to be transmitted to the third communication device according to a predetermined condition after the notification of the first information. The communication device according to paragraph 1.

(20) The
　control unit controls a method of transmitting a packet scheduled to be transmitted to the third communication device according to a predetermined condition after the notification of the first information, according to the above (16) to (19). The communication device according to any one of the above.
(21)
　After the notification of the first information, the notification unit instructs the third communication device to release a unicast wireless link with another communication device according to a predetermined condition. , The communication device according to any one of (16) to (20) above.
(22) The
　control unit switches communication with the third communication device to multi-carrier communication according to a predetermined condition after the notification of the first information, according to the above (16) to (21). The communication device according to any one of the above.
(23) The
　control unit controls the frequency band used for communication with the third communication device according to a predetermined condition after the notification of the first information. 22) The communication device according to any one of the following items.
(24)
　Any of the above (16) to (23), wherein the control unit controls a data transmission path to the third communication device according to a predetermined condition after the notification of the first information. The communication device according to item 1.
(25)
　After the notification of the first information, the control unit reserves a resource for the third communication device to receive a packet according to a predetermined condition (16) to (24). ). The communication device according to any one of the items.
(26)
　After the notification of the first information, the control unit determines the comparison result of the priority of the packet scheduled to be transmitted to the third communication device and the priority related to the reception of the packet in the third communication device. The communication device according to any one of (16) to (25) above, which drops a packet to be transmitted to the third communication device based on the above.
(27) 　The first information regarding the data transmission condition using the
　communication unit that performs wireless communication and the
communication method that switches between transmission and reception in a time-division manner to perform inter-device communication is first transmitted via the wireless communication. A communication device including an acquisition unit acquired from the communication device of
　No. 1 and a control unit for controlling an operation related to reception of data transmitted from the first communication device according to the first information
　.
(28) 　The first information regarding the data transmission condition using the
　communication unit that performs wireless communication and the
communication method that switches between transmission and reception in a time-division manner to perform inter-device communication is transmitted to the third via the wireless communication. A communication device including a notification unit that notifies the communication device of the
　above,
　and a control unit that controls an operation related to transmission of data to the third communication device after the notification of the first information .
Code description
[0222]
　1 System
　100 Base station
　110 Antenna unit
　120 Wireless communication unit
　130 Network communication unit
　140 Storage unit
　150 Control unit
　151 Communication control unit
　153 Information acquisition unit
　155 Notification unit
　200 Terminal device
　210 Antenna unit
　220 Wireless communication unit
　230 Storage unit
　240 Control unit
　241 Communication control unit
　243 Information acquisition unit
　247 Notification unit
The scope of the claims
[Claim 1]

　The first communication device via the wireless communication provides the first information regarding the data transmission condition using the 　communication unit that performs wireless communication and the communication method that switches between transmission and reception in a time division manner to perform inter-device communication.
　A communication device including an acquisition unit acquired from the above and a control unit that controls an operation related to reception of data transmitted from the first communication device according to the first information
　.
[Claim 2]
　The control unit controls an operation related to transmission of data to a second communication device according to the first information and a situation regarding transmission or reception of data in the communication method. The communication device described in.
[Claim 3]
　The second aspect of the present invention, wherein the control unit drops a packet to be transmitted to the second communication device according to the first information and a situation regarding transmission or reception of data in the communication method. Communication device.
[Claim 4]
　The control unit is based on a comparison between the priority of the packet transmitted from the first communication device according to the first information and the priority of the packet scheduled to be transmitted to the second communication device. The communication device according to claim 3, wherein a packet to be transmitted is dropped on the second communication device.
[Claim 5]
　The control unit releases a unicast wireless link established between the first information and the second communication device depending on the situation regarding the transmission or reception of data in the communication method. The communication device according to claim 2.
[Claim 6]
　The acquisition unit is notified through the first partial region in the region where the resources are allocated, the information as to whether or not significant data included in the first information acquired second information including at least,
　the The communication device according to claim 2, wherein the control unit determines whether or not to receive data transmitted from the first communication device based on the second information
　.
[Claim 7]
　The second information includes information about a second subregion different from the first subregion, and the
　acquisition unit is notified via the second subregion based on the second information.
　The communication device according to claim 6, wherein the communication device according to claim 6 acquires information other than the information notified as the second information among the first information .
[Claim 8]
　Based on the second information, the control unit determines whether to prioritize the reception of data transmitted from the first communication device or the transmission of data to the second communication device. , The communication device according to claim 6.
[Claim 9]
　The control unit controls a route related to reception of data transmitted from the first communication device according to the first information and a situation regarding transmission or reception of data in the communication method. The communication device according to claim 1.
[Claim 10]
　The control unit
　　determines whether or not to allow the first communication device to transmit data based on the first information,
　　and is transmitted from the first communication device according to the result of the determination.
　The communication device according to claim 1, wherein the data is controlled so as to be received .
[Claim 11]
　The first communication device includes a notification unit for notifying information according to the result of determination of whether or not to permit transmission of data, and the
　control unit receives the notification of information according to the result of the determination. The communication device according to
　claim 10, wherein the data transmitted from the first communication device is controlled to be received .
[Claim 12]
　A notification unit for notifying the first communication device of third information regarding data reception is provided, and the
　acquisition unit receives the first information from the first communication device after the notification of the third information.
　The communication device according to claim 1 to be acquired .
[Claim 13]
　The third information includes information
　　on the number of receiving antennas, information
　　on devices related to
　　data reception, information on resource pools available for data reception, information
　　on processing related to data transmission, and
　　data. 　The communication device according to claim 12, 　which includes at least one of information on processing related
　　to reception and information on resources capable of receiving data .

[Claim 14]
　The first information includes information
　　about a buffer of transmission data in the first communication device, information about
　　a future transmission schedule by the first communication device,
　　and information about a packet type related to transmission of the data. ,
　　information about the reception deadline of the packet according to the transmission of the data,
　　information about the priority of the packet according to the transmission of the data,
　　and information as to whether or not important data,
　including at least one of,
　in claim 1 The communication device described.
[Claim 15]
　The communication device according to claim 1, further comprising a notification unit that notifies the first communication device of information about a resource that can receive data.
[Claim 16]

　The first information regarding the data transmission condition using the 　communication unit that performs wireless communication and the communication method that switches between transmission and reception in a time-division manner to perform inter-device communication is transmitted to the third communication device via the wireless communication.
　A communication device including a notification unit for notifying the first information, and a control unit for controlling an operation related to transmission of data to the third communication device after the notification of the first information
　.
[Claim 17]
　After the notification of the first information, the control unit between the transmission of the data to the third communication device and the reception of the data transmitted from the fourth communication device according to a predetermined condition. 16. The communication device according to claim 16, which controls the priority of the above.
[Claim 18]
　The control unit sets the
　　priority as
　　the type of communication traffic,
　　the position information of at least one of the communication device, the third communication device, and the fourth communication device, and
　　the congestion degree of the channel. 　The communication device 　　according to claim 17, wherein the communication device is controlled based on at least one of the
　　channel occupancy rate and the channel occupancy rate .

[Claim 19]
　The communication device according to claim 16, wherein the control unit drops a packet scheduled to be transmitted to the third communication device according to a predetermined condition after the notification of the first information.
[Claim 20]
　The communication device according to claim 16, wherein the control unit controls a method of transmitting a packet scheduled to be transmitted to the third communication device according to a predetermined condition after the notification of the first information.
[Claim 21]
　A claim that the notification unit instructs the third communication device to release a unicast wireless link with another communication device according to a predetermined condition after the notification of the first information. 16. The communication device according to 16.
[Claim 22]
　The communication device according to claim 16, wherein the control unit switches communication with the third communication device to multi-carrier communication according to a predetermined condition after the notification of the first information.
[Claim 23]
　The communication device according to claim 16, wherein the control unit controls a frequency band used for communication with the third communication device according to a predetermined condition after the notification of the first information.
[Claim 24]
　The communication device according to claim 16, wherein the control unit controls a data transmission route to the third communication device according to a predetermined condition after the notification of the first information.
[Claim 25]
　The communication device according to claim 16, wherein the control unit reserves a resource for the third communication device to receive a packet according to a predetermined condition after the notification of the first information.
[Claim 26]
　After the notification of the first information, the control unit determines the comparison result of the priority of the packet scheduled to be transmitted to the third communication device and the priority related to the reception of the packet in the third communication device. The communication device according to claim 16, wherein a packet to be transmitted is dropped to the third communication device based on the above.