Title of invention: terminal device, base station device and method
Technical field
[0001]
　The present disclosure relates to a terminal device, a base station device and a method.
Background technology
[0002]
　Wireless access method and wireless network for cellular mobile communication (hereinafter, "Long Term Evolution (LTE)", "LTE-Advanced (LTE-A)", "LTE-Advanced Pro (LTE-A Pro)", "New Radio ( NR)”, “New Radio Access Technology (NRAT)”, “5G”, “Evolved Universal Terrestrial Radio Access (EUTRA)”, or “Further EUTRA (FEUTRA)”) is a third generation partnership project (3rd Generation). Partnership Project: 3GPP). In the following description, LTE includes LTE-A, LTE-A Pro, and EUTRA, and NR includes NRAT and FEUTRA. In LTE, a base station device (base station) is an eNodeB (evolved NodeB), in NR, a base station device (base station) is a gNodeB, and in LTE and NR, a terminal device (mobile station, mobile station device, terminal) is a UE (User Equipment). Also called. LTE and NR are cellular communication systems in which a plurality of areas covered by a base station device are arranged in a cell shape. A single base station device may manage a plurality of cells.
[0003]
　NR is a next-generation radio access scheme for LTE, which is a RAT (Radio Access Technology) different from LTE. NR is an access technology that can support various use cases including eMBB (Enhanced mobile broadband), mMTC (Massive machine type communications), and URLLC (Ultra reliable and low latency communications). The NR is examined aiming at a technical framework corresponding to usage scenarios, requirements, and placement scenarios in those use cases.
[0004]
　In the unlicensed band and the license shared band, the operation of a wireless access system based on cellular communication is being considered. Coexistence with other nodes and wireless systems in such unlicensed bands is important, and for wireless access methods such as LTE and NR, LBT (Listen Before Talk) that senses a channel before transmission. And features such as discontinuous transmission are required. Non-Patent Document 1 discloses details of a radio access method based on NR in an unlicensed band. The unlicensed bands are, for example, 2.4 GHz band, 5 GHz band, and 6 GHz band. The license sharing band is, for example, the 3.5 GHz band or the 37 GHz band.
Prior art documents
Non-patent literature
[0005]
Non-Patent Document 1: RP-172021, “Study on NR-based Access to Unlicensed Spectrum,” 3GPP TSG RAN Meeting #77, Sapporo, Japan, September 11-14, 2017.
Summary of the invention
Problems to be Solved by the Invention
[0006]
　However, in an environment in which a plurality of communication devices exist, when each communication device independently performs LBT, the utilization efficiency of radio resources (frequency resource and time resource) may decrease. This is because each time a communication device uses a wireless resource, a waiting time occurs due to sensing for obtaining an access right.
[0007]
　Therefore, the present disclosure provides a mechanism that enables a plurality of communication devices to use wireless resources more efficiently.
Means for solving the problem
[0008]
　According to the present disclosure, a control unit that transmits, on the uplink or the side link, first resource information indicating a radio resource that can be used by another communication device among the radio resources that have performed carrier sense and acquired an access right. There is provided a terminal device including:
[0009]
　Further, according to the present disclosure, from the terminal device, resource information indicating a wireless resource that can be used by another communication device other than the terminal device among the wireless resources that the terminal device has performed carrier sense to obtain an access right. There is provided a base station device including a control unit that receives and uses a radio resource that can be used by the other communication device for communication.
[0010]
　Further, according to the present disclosure, the first resource information indicating a radio resource that can be used by another communication device, out of the radio resources obtained by performing carrier sense to obtain an access right, is transmitted on the uplink or the side link. A method performed by a processor is provided, including:
Effect of the invention
[0011]
　As described above, according to the present disclosure, a mechanism that allows a plurality of communication devices to use wireless resources more efficiently is provided. Note that the above effects are not necessarily limited, and in addition to or in place of the above effects, any of the effects shown in this specification, or other effects that can be grasped from this specification. May be played.
Brief description of the drawings
[0012]
FIG. 1 is a diagram showing an example of an overall configuration of a system according to an embodiment of the present disclosure.
FIG. 2 is a diagram for explaining an example of communication in LAA.
FIG. 3 is a diagram showing an example of a frame configuration for self-contained transmission in the present embodiment.
FIG. 4 is a block diagram showing an example of a configuration of a base station device according to the present embodiment.
FIG. 5 is a block diagram showing an example of a configuration of a terminal device according to the
present embodiment. FIG. 6 is a diagram for explaining an example of sharing of an access right according to the present embodiment.
FIG. 7 is a diagram for explaining an example of sharing an access right according to the present embodiment.
FIG. 8 is a diagram for explaining an example of sharing an access right according to the present embodiment.
FIG. 9 is a diagram for explaining an example of sharing an access right according to the present embodiment.
FIG. 10 is a diagram for explaining sharing of an access right by a second terminal device according to the present embodiment.
FIG. 11 is a flowchart showing an example of the flow of access right sharing processing executed by the first terminal device according to the present embodiment.
FIG. 12 is a flowchart showing an example of a flow of access right sharing processing executed by the base station apparatus according to the present embodiment.
FIG. 13 is a flowchart showing an example of a flow of access right sharing processing executed by the second terminal device according to the present embodiment.
FIG. 14 is a flowchart showing an example of the flow of access right sharing processing executed by the second terminal device according to the present embodiment.
FIG. 15 is a block diagram showing a first example of a schematic configuration of an eNB.
FIG. 16 is a block diagram showing a second example of a schematic configuration of an eNB.
FIG. 17 is a block diagram showing an example of a schematic configuration of a smartphone.
FIG. 18 is a block diagram showing an example of a schematic configuration of a car navigation device.
MODE FOR CARRYING OUT THE INVENTION
[0013]
　Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the present specification and the drawings, constituent elements having substantially the same functional configuration are designated by the same reference numerals, and a duplicate description will be omitted.
[0014]
　The description will be given in the following order.
　　1. Introduction
　　　1.1. System configuration example
　　　1.2. Technical problem
　　　1.3. Outline of proposed method
　　　1.4. Related technology
　　2. Configuration example
　　　2.1. Configuration example of base station apparatus
　　　2.2. Configuration example of terminal device
　　3. Technical features
　　　3.1. Sharing sharable resource information
　　　3.2. Sharing of access rights
　　　3.3. Content of sharable resource information
　　　3.4. Transmission means of sharable resource information
　　　3.5. Sharing by the second terminal device
　　　3.6. Process flow
　　4. Application example
　　5. Summary
[0015]
　<<1. Introduction >>>
　<1.1. System Configuration Example>
　FIG. 1 is a diagram showing an example of the overall configuration of a system 1 according to an embodiment of the present disclosure. As illustrated in FIG. 1, the system 1 includes a base station device 100 (100A and 100B), a terminal device 200 (200A and 200B), a core network (Core Network) 20, and a PDN (Packet Data Network) 30.
[0016]
　The base station device 100 operates the cell 11 (11A or 11B) and provides a wireless service to one or more terminal devices located inside the cell 11. For example, the base station device 100A provides a wireless service to the terminal device 200A, and the base station device 100B provides a wireless service to the terminal device 200B. The cell 11 can be operated according to an arbitrary wireless communication system such as LTE or NR (New Radio). The base station device 100 is connected to the core network 20. The core network 20 is connected to the PDN 30.
[0017]
　The core network 20 may include an MME (Mobility Management Entity), an S-GW (Serving gateway), a P-GW (PDN gateway), a PCRF (Policy and Charging Rule Function), and an HSS (Home Subscriber Server). Alternatively, the core network 20 may include NR entities having similar functions. The MME is a control node that handles signals on the control plane, and manages the moving state of the terminal device. The S-GW is a control node that handles user plane signals, and is a gateway device that switches a user data transfer path. The P-GW is a control node that handles user plane signals and is a gateway device that serves as a connection point between the core network 20 and the PDN 30. The PCRF is a control node that controls policies such as QoS (Quality of Service) for the bearer and charging. The HSS is a control node that handles subscriber data and performs service control.
[0018]
　The terminal device 200 wirelessly communicates with the base station device 100 under the control of the base station device 100. The terminal device 200 may be a so-called user terminal (User Equipment: UE). For example, the terminal device 200 transmits an uplink signal to the base station device 100 and receives a downlink signal from the base station device 100. The terminal device 200 can also perform device-to-device (D2D: Device to Device) communication. That is, the terminal device 200 can transmit the sidelink signal of the other terminal device 200 and receive the sidelink signal from the other terminal device 200.
[0019]
　<1.2. Technical Problem> 　-When
　Base Station Device Acquires Access Right
Conventionally, in LAA (licensed assisted access), the base station device acquires an access right to a radio resource (hereinafter, also referred to as a channel). Then, the acquired access right is shared (in other words, shared) by the base station device and the terminal device communicating with the base station device. This point will be described with reference to FIG.
[0020]
　FIG. 2 is a diagram for explaining an example of communication in LAA. The upper part of FIG. 2 illustrates carrier sense performed by the base station device and signals transmitted by the base station device. The lower part of FIG. 2 shows carrier sense performed by the terminal device and signals transmitted by the terminal device. The rectangle described as DL is a time resource for transmitting a downlink signal. The time resource is, for example, a slot or a subframe. The rectangle described as UL is a time resource in which the downlink signal is transmitted. As shown in FIG. 2, the base station apparatus first performs carrier sense using random backoff and acquires an access right. Next, the base station device transmits the downlink signal within a period (COT: Channel Occupancy Time) in which the channel may be occupied based on the acquired access right. COT is a period during which the acquired access right is valid. On the other hand, the base station device uses the uplink grant to instruct the terminal device to perform uplink transmission during COT. Then, the terminal device performs carrier sense without using random backoff, and then transmits an uplink signal according to the uplink grant.
[0021]
　The method of channel access changes depending on whether or not it is within the COT. Specifically, the communication device accesses the channel by performing carrier sense using random backoff outside the COT (for example, LBT category 4). On the other hand, the communication device performs carrier sense without using random backoff within the COT, that is, during a period in which it has an access right, and accesses the channel (for example, LBT category 2). In the example shown in FIG. 2, since the base station apparatus has not acquired the access right at the beginning (that is, outside the COT), it uses the random backoff to access the channel. On the other hand, the terminal device shares the access right acquired by the base station device (that is, carpool) based on the uplink grant, so that the access right acquired by the base station device is valid (that is, In COT), access the channel without random backoff. As described above, in the uplink transmission in LAA, since the access right is shared, the terminal device does not have to perform channel access using random backoff from 1.
[0022]
　-Various studies
　Meanwhile, in LTE and NR, uplink grant-free transmission (also referred to as grantless transmission) is being studied. Grant-free transmission is a method in which a terminal device transmits an uplink signal without receiving an uplink grant from a base station device in a periodic resource quasi-statically instructed by RRC (Radio Resource Control) signaling. Is.
[0023]
　Furthermore, in NR, voluntary uplink channel access (autonomous uplink access) in which a terminal device obtains an access right is under study. The voluntary uplink channel access is a method in which, when performing uplink grant-free transmission, the terminal device itself performs an LBT using a channel access procedure using random backoff to acquire an access right.
[0024]
　Further, D2D communication using an unlicensed band is also under study. By using the unlicensed band for D2D communication, there is an advantage that D2D communication between different operators becomes easy to put into practical use.
[0025]
　-Technical problem
　The utilization efficiency of wireless resources may be reduced if each terminal device acquires an access right independently. Even if the terminal device acquires the access right, there is no mechanism for sharing the acquired access right with other communication devices. Therefore, after acquiring the access right, the terminal device once releases the channel for communication by another communication device. Then, the other communication device again performs channel access from 1 using the random backoff, which causes a waiting time.
[0026]
　<1.3. Outline of Proposed Method>
　Therefore, in an embodiment of the present disclosure, in view of the above-described technical problem, the access right acquired by the terminal device 200 is changed to another communication device (for example, the base station device 100 or the other terminal device 200). ) Suggests a mechanism that can be shared (in other words, carpool).
[0027]
　In the present embodiment, first, the terminal device 200 performs channel access using random backoff and acquires an access right. After that, the terminal device 200 transmits, on the uplink or the side link, information indicating a radio resource that can be used by another communication device among the radio resources that have acquired the access right. As a result, the other communication device that has received the information can share the access right acquired by the terminal device 200 and perform communication without acquiring the access right by itself. Specifically, the other communication device performs communication by performing channel access without using random backoff in the radio resource related to the access right acquired by the terminal device 200. The other communication device can perform communication without acquiring the access right, so that the processing load is reduced. Further, since carrier waiting using random backoff is not performed, the waiting time is reduced, so that it is possible to improve the utilization efficiency of radio resources.
[0028]
　<1.4. Related Technology>
　Below, a technology related to the proposed method will be described.
[0029]
　　 In
　NR, a physical channel and/or a physical signal can be transmitted by self-contained transmission. FIG. 3 shows an example (A to C) of a frame configuration for self-contained transmission in this embodiment. In self-contained transmission, one transmission/reception is composed of consecutive downlink transmission, GP, and consecutive downlink transmission from the beginning. The continuous downlink transmission includes at least one downlink control information and DMRS. The downlink control information instructs reception of a downlink physical channel included in the continuous downlink transmission or transmission of an uplink physical channel included in the continuous uplink transmission. When the downlink control information instructs reception of the downlink physical channel, the terminal device 200 tries to receive the downlink physical channel based on the downlink control information. Then, the terminal device 200 transmits the success or failure of reception (decoding success or failure) of the downlink physical channel through the uplink control channel included in the uplink transmission allocated after GP. On the other hand, when the downlink control information instructs transmission of the uplink physical channel, the uplink physical channel transmitted based on the downlink control information is included in the uplink transmission for transmission. As described above, by flexibly switching the transmission of the uplink data and the transmission of the downlink data according to the downlink control information, it is possible to immediately cope with the increase or decrease of the traffic ratio of the uplink and the downlink. In addition, downlink low-delay communication can be realized by notifying the success or failure of downlink reception by immediately following uplink transmission.
[0030]
　The unit slot time is a minimum time unit that defines downlink transmission, GP, or uplink transmission. Unit slot time is reserved for either downlink transmission, GP, or uplink transmission. Both downlink transmission and uplink transmission are not included in the unit slot time. The unit slot time may be the minimum transmission time of the channel associated with the DMRS included in the unit slot time. One unit slot time is defined by , for example, the sampling interval (T s ) of NR or an integer multiple of the symbol length.
[0031]
　The unit frame time may be the minimum time specified in scheduling. The unit frame time may be a minimum unit in which the transport block is transmitted. The unit slot time may be the maximum transmission time of the channel associated with the DMRS included in the unit slot time. The unit frame time may be a unit time for determining the uplink transmission power in the terminal device 200. The unit frame time may be referred to as a subframe. There are three types of unit frame time: only downlink transmission, only uplink transmission, and combination of uplink transmission and downlink transmission. One unit frame time is defined by, for example, the sampling interval (T s ) of NR , the symbol length, or an integral multiple of the unit slot time.
[0032]
　The transmission/reception time is one transmission/reception time. Between one transmission/reception and the other transmission/reception is occupied a time (gap) during which no physical channel and no physical signal is transmitted. The terminal device 200 does not have to average the CSI measurements between different transmissions. The transmit/receive time may be referred to as TTI. One transmission/reception time is defined by, for example, an NR sampling interval (T s ), a symbol length, a unit slot time, or an integral multiple of a unit frame time.
[0033]
　　 The channel access (Channel access, Listen before Talk) procedure is performed to access the unlicensed channel transmitted by the base station apparatus or the terminal apparatus.
[0034]
　In the channel access procedure, channel sensing is performed once or a plurality of times. Based on the result of the sensing, it is determined (idle determination) whether the channel is idle (idle, unoccupied, available, enable) or busy (busy, occupied, unavailable, disable). In channel sensing, the power of the channel is sensed during a given waiting time.
[0035]
　Examples of the latency of the channel access procedure include a first latency (slot), a second latency, and a third latency (deferral period), a fourth latency.
[0036]
　A slot is a unit of waiting time of a base station device and a terminal device in a channel access procedure. The slot is defined by, for example, 9 microseconds.
[0037]
　In the second waiting time, one slot is inserted at the head. The second waiting time is defined as, for example, 16 microseconds.
[0038]
　The defer period consists of a second waiting time and a plurality of consecutive slots following the second waiting time. The number of consecutive slots following the second waiting time is determined based on a priority class used to satisfy QoS.
[0039]
　The fourth waiting time is constituted by the second waiting time and one slot following the second waiting time.
[0040]
　The base station device or the terminal device senses a predetermined channel during a predetermined slot. A given slot is considered idle if the power detected by the base station or terminal for at least 4 microseconds within the given slot period is less than a predetermined power detection threshold. .. On the other hand, if the power is greater than the predetermined power detection threshold, then the given slot is considered busy.
[0041]
　The channel access procedure includes a first channel access procedure and a second channel access procedure. The first channel access procedure is performed using a plurality of slots and deferral periods. The second channel access procedure is performed with one fourth latency.
[0042]
　The parameters for channel access are determined based on the priority class. The parameters relating to channel access include, for example, the minimum collision window, the maximum collision window, the maximum channel occupation time, the value that the collision window can take, and the like. The priority class is defined by the value of QCI (QoS class identifier) ​​that processes QoS (Quality of Service). Table 1 shows a correspondence table of parameters related to priority classes and channel access, and Table 2 shows an example of mapping of priority classes and QCIs.
[0043]
[table 1]

[0044]
[Table 2]

[0045]
　　 In
　the first channel access procedure, the procedure described below is performed.
[0046]
　(0) Channel sensing is performed during the postponement period. If the channel was idle in the slot within the deferral period, go to step (1), else go to step (6).
[0047]
　(1) Obtain the initial value of the counter. The possible initial value of the counter is an integer between 0 and the collision window CW. The initial value of the counter is randomly determined according to the uniform distribution. The initial value of the counter is set in the counter N, and the process proceeds to step (2).
[0048]
　(2) When the counter N is larger than 0 and the subtraction of the counter N is selected, 1 is subtracted from the counter N. Then, the process proceeds to step (3).
[0049]
　(3) The slot period is added to wait. Also, in that additional slot, the channel is sensed. If the additional slot was idle, go to step (4), else go to step (5).
[0050]
　(4) If the counter N is 0, stop this procedure. If not, proceed to step (2).
[0051]
　(5) A postponement period will be added for waiting. Also, the channel is sensed until it is detected as busy on any one of the slots included in the additional deferral period, or until all slots included in the additional deferral period can be detected as idle. .. Then, the process proceeds to step (6).
[0052]
　(6) If the channel is sensed to be idle in all of the slots included in its additional deferral period, go to step (4), else go to step (5).
[0053]
　After stopping the step (4) in the above procedure, transmission including data such as PDSCH and PUSCH is performed on the channel.
[0054]
　After the step (4) in the above procedure is stopped, transmission may not be performed on the channel. In this case, then, transmission may be performed without performing the above procedure if the channel was idle in all of the slots and deferrals immediately before transmission. On the other hand, if the channel was not idle in any of its slots and its deferrals, then it was sensed that the channel was idle in all of the slots in the additional deferrals, then (1 ) Go to step.
[0055]
　　 In
　the second channel access procedure, transmission may be performed immediately after the channel is considered to be idle as a result of sensing at least the fourth waiting time. On the other hand, if at least the fourth latency sensing results in the channel not being considered idle, then no transmission occurs.
[0056]
　　
　The collision window CW (contention window) used in the first channel access procedure is determined based on the collision window adaptation procedure.
[0057]
　The value of the collision window CW is held for each priority class. Further, the collision window CW takes a value between the minimum collision window and the maximum collision window. The minimum collision window and the maximum collision window are determined based on the priority class.
[0058]
　The adjustment of the value of the collision window CW is performed before the step (1) of the first channel access procedure. Increase the value of collision window CW if the proportion of NACKs in the HARQ response corresponding to the shared channel of the reference subframe or the reference HARQ process in the collision window adaptation procedure is higher than the threshold value, otherwise Set the value to the minimum collision window.
[0059]
　The value of the collision window CW is increased based on the equation of CW=2·(CW+1)−1, for example.
[0060]
　　 When performing downlink transmission including PDSCH, PDCCH, and/or EPDCCH in an unlicensed channel, the base station device uses the first channel access procedure to perform the downlink transmission. , And perform its downlink transmission.
[0061]
　On the other hand, in the unlicensed channel, when performing downlink transmission including DRS but not PDSCH, the base station apparatus accesses the channel based on the second channel access procedure and performs the downlink transmission. The downlink transmission period is preferably shorter than 1 millisecond.
[0062]
　　 In the
　unlicensed channel, when instructed to perform the first channel access procedure in the uplink grant that schedules the PUSCH, the terminal device transmits the uplink transmission including the PUSCH. First do the first channel access procedure.
[0063]
　When instructed to perform the second channel access procedure in the uplink grant that schedules the PUSCH, the terminal device performs the second channel access procedure before the uplink transmission including the PUSCH.
[0064]
　For uplink transmission that does not include PUSCH but does include SRS, the terminal device performs the second channel access procedure before the uplink transmission.
[0065]
　In addition, when the end of the uplink transmission instructed by the uplink grant is within the uplink period (UL duration), the terminal device transmits the uplink transmission regardless of the procedure type instructed by the uplink grant. Perform the second channel access procedure before.
[0066]
　In addition, when uplink transmission continues with a fourth waiting time after the downlink transmission from the base station ends, the terminal device performs the second channel access procedure before the uplink transmission.
[0067]
　　 In the channel access procedure in the
　unlicensed channel using NR, non-beamformed channel sensing and beamformed channel sensing are performed.
[0068]
　The non-beamformed channel sensing is channel sensing by reception in which directivity is not controlled, or channel sensing having no direction information. The channel sensing having no direction information is, for example, channel sensing obtained by averaging the measurement results in all directions. The transmitting station does not have to recognize the directivity (angle, direction) used in channel sensing.
[0069]
　The beamformed channel sensing is channel sensing by reception whose directionality is controlled, or channel sensing having direction information. That is, it is channel sensing in which the reception beam is directed in a predetermined direction. A transmitting station having a function of performing beamformed channel sensing can perform channel sensing one or more times using different directivities.
[0070]
　By performing beamformed channel sensing, the area detected by sensing is narrowed. By this means, the transmitting station can reduce the frequency of detection of communication links that do not interfere, and reduce the exposed terminal problem.
[0071]
　<<2. Configuration example>>
　<2.1. Configuration Example of Base Station Device>
　FIG. 4 is a block diagram showing an example of the configuration of the base station device 100 according to the present embodiment. Referring to FIG. 4, the base station device 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.
[0072]
　(1) Antenna unit 110 The
　antenna unit 110 radiates the signal output from the wireless communication unit 120 as a radio wave into space. The antenna unit 110 also converts radio waves in the space into a signal and outputs the signal to the wireless communication unit 120.
[0073]
　(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.
[0074]
　(3) Network communication unit 130 The
　network communication unit 130 transmits and receives information. For example, the network communication unit 130 transmits information to other nodes and receives information from other nodes. For example, the other node includes another base station and a core network node.
[0075]
　(4) Storage Unit 140 The
　storage unit 140 temporarily or permanently stores a program and various data for the operation of the base station device 100.
[0076]
　(5) Control Unit 150 The control unit 150
　controls the overall operation of the base station device 100 and provides various functions of the base station device 100. The control unit 150 includes an access right sharing unit 151 and a communication processing unit 153.
[0077]
　The access right sharing unit 151 has a function of performing processing related to sharing of the access right acquired by the terminal device 200. For example, the access right sharing unit 151 acquires information on the wireless resource for which the access right is acquired by the terminal device 200. The access right sharing unit 151 also performs processing for causing the terminal device 200 other than the terminal device 200 that has acquired the access right to use the wireless resource for which the terminal device 200 has acquired the access right.
[0078]
　The communication processing unit 153 has a function of performing communication processing with the terminal device 200. The communication processing unit 153 performs different processing depending on whether or not the wireless resource used for communication is the wireless resource for which the access right has been acquired. More specifically, when using a wireless resource for which an access right has not been acquired, the communication processing unit 153 performs channel access using random backoff to perform communication. On the other hand, when using the wireless resource for which the access right has been acquired by the terminal device 200, the communication processing unit 153 performs channel access without random backoff to perform communication.
[0079]
　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.
[0080]
　<2.2. Example of Configuration of Terminal Device>
　FIG. 5 is a block diagram showing an example of the configuration of the terminal device 200 according to the present embodiment. Referring to FIG. 5, the terminal device 200 includes an antenna unit 210, a wireless communication unit 220, a storage unit 230, and a control unit 240.
[0081]
　(1) Antenna part 210 The
　antenna part 210 radiates the signal output by the wireless communication part 220 to space as a radio wave. The antenna unit 210 also converts radio waves in the space into a signal and outputs the signal to the wireless communication unit 220.
[0082]
　(2) Wireless communication unit 220 The
　wireless communication unit 220 transmits and receives signals. For example, the wireless communication unit 220 receives a downlink signal from the base station and transmits an uplink signal to the base station. Further, the wireless communication unit 220 receives a side link signal from another terminal device 200 and transmits a side link signal to another terminal device 200.
[0083]
　(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.
[0084]
　(4) Control Unit 240 The control unit 240
　controls the overall operation of the terminal device 200 and provides various functions of the terminal device 200. The control unit 240 includes an access right sharing unit 241 and a communication processing unit 243.
[0085]
　The access right sharing unit 241 performs processing regarding sharing of access rights. The terminal device 200 may acquire the access right by itself. In that case, the access right sharing unit 241 transmits information about the wireless resource that has acquired the access right to another communication device (for example, the base station device 100 or another terminal device 200). The terminal device 200 may share the access right acquired by another terminal device 200. In that case, the access right sharing unit 241 acquires information regarding the wireless resource for which the access right has been acquired by the other terminal device 200.
[0086]
　The communication processing unit 243 has a function of performing communication processing with another communication device. The communication processing unit 243 performs different processing depending on whether or not the wireless resource used for communication is the wireless resource for which the access right has been acquired. Specifically, when using a wireless resource for which an access right has not been acquired, the communication processing unit 243 performs communication after performing channel access using random backoff to acquire the access right. On the other hand, when using the wireless resource for which the access right has been acquired by the terminal device 200 itself or another terminal device 200, the communication processing unit 243 performs channel access without random backoff to perform communication.
[0087]
　The control unit 240 may further include other components other than these components. That is, the control unit 240 can perform operations other than the operations of these components.
[0088]
　<<3. Technical features>>
　<3.1. Sharing sharable resource information> The
　terminal device 200 (for example, the communication processing unit 243) performs carrier sense to obtain an access right. Specifically, the terminal device 200 performs carrier sense using random backoff to obtain an access right to a radio resource. Then, the terminal device 200 (for example, the access right sharing unit 241) transmits resource information indicating a radio resource that can be used by another communication device among the radio resources for which the access right has been acquired, on the uplink or the side link. .. This allows the other communication devices to share the access right acquired by the terminal device 200. Hereinafter, the other communication device is also referred to as a shared communication device. The shared communication device includes the base station device 100 and another terminal device 200.
[0089]
　The terminal device 200 that acquires the access right is also referred to as a first terminal device 200. The other terminal device 200 that is the terminal device 200 and shares the access right acquired by the first terminal device 200 is also referred to as a second terminal device 200. The terminal device 200 can function as both the first terminal device 200 and the second terminal device 200. When the terminal device 200 functions as the first terminal device 200, the resource information transmitted by the first terminal device 200 corresponds to the first resource information. When the terminal device 200 functions as the second terminal device 200, the resource information transmitted from the first terminal device 200 and received by the second terminal device 200 corresponds to the second resource information.
[0090]
　Of the wireless resources that the first terminal device 200 has acquired the access right, the wireless resource that can be used by the shared communication device is also referred to as a sharable resource below. The sharable resource may be regarded as a wireless resource for which the first terminal device 200 has acquired the access right, or the first terminal device among the wireless resources for which the first terminal device 200 has acquired the access right. It may be regarded as a radio resource that 200 does not use. Focusing on the time resource, the sharable resource may be regarded as a COT, or may be a section of the COT that is not used by the first terminal device 200. Further, the resource information indicating the sharable resource is also referred to as sharable resource information below.
[0091]
　<3.2. Sharing of access right> When the
　shared communication device receives the sharable resource information, the shared communication device transmits a signal using the sharable resource based on the received sharable resource information. The sharable resource information here is a resource that can be used by another communication device other than the first terminal device 200 among the radio resources that the first terminal device 200 has performed carrier sense to obtain the access right. It is information to show.
[0092]
　(1)
　Sharing by Base Station Device 100 A case where the shared communication device is the base station device 100 will be described.
[0093]
　The base station device 100 (for example, the communication processing unit 153) may use the sharable resource for communication based on the sharable resource information. In that case, the base station apparatus 100 transmits a signal using a sharable resource. That is, the base station device 100 transmits a signal using a radio resource that the first terminal device 200 does not use, of the radio resources that the first terminal device 200 has acquired the access right. At that time, the base station apparatus 100 performs channel access without performing carrier sense using random backoff. For example, the base station device 100 may perform carrier sense without using random backoff to perform channel access. Also, the base station device 100 may perform channel access without performing carrier sense in the first place. Note that the signal transmission destination may be the first terminal device 200 or another terminal device 200 connected to the base station device 100.
[0094]
　In addition, the base station device 100 may cause the second terminal device 200 to use the sharable resource. In that case, the base station device 100 (for example, the access right sharing unit 151) transmits the grant message (for example, the uplink grant) that instructs the transmission of the signal in the sharable resource to the first based on the sharable resource information. It transmits to the terminal device 200 (corresponding to the second terminal device 200) other than the terminal device 200. Then, the second terminal device 200 transmits a signal (for example, an uplink signal) using the sharable resource based on the received grant message. More specifically, the second terminal device 200 uses the radio resources that the first terminal device 200 and the base station device 100 do not use among the radio resources for which the first terminal device 200 has acquired the access right, To send. At that time, the second terminal device 200 performs channel access without performing carrier sense using random backoff. For example, the second terminal device 200 may perform carrier sensing without using random backoff to perform channel access. Also, the second terminal device 200 may perform channel access without performing carrier sense in the first place.
[0095]
　In either case, since the base station device 100 and the second terminal device 200 do not perform carrier sense using random backoff, the waiting time for channel access is reduced. That is, it is possible to improve the utilization efficiency of wireless resources.
[0096]
　(2)
　Sharing by Second Terminal Device 200 A case where the shared communication device is the second terminal device 200 will be described.
[0097]
　The second terminal device 200 (for example, the communication processing unit 243) transmits a signal using the sharable resource based on the sharable resource information. That is, the second terminal device 200 transmits a signal by using a radio resource that the first terminal device 200 does not use among the radio resources that the first terminal device 200 has acquired the access right. At that time, the second terminal apparatus 200 performs channel access without performing carrier sense using random backoff. For example, the second terminal device 200 may perform carrier sensing without using random backoff to perform channel access. Also, the second terminal device 200 may perform channel access without performing carrier sense in the first place.
[0098]
　In any case, since the second terminal device 200 does not perform the carrier sense using the random backoff, the waiting time for channel access is reduced. That is, it becomes possible to improve the utilization efficiency of wireless resources.
[0099]
　(3) Restriction when
　Sharing The shared communication device may be subject to a predetermined restriction when sharing the access right. Specifically, the types of signals that can be transmitted using the sharable resource may be limited.
[0100]
　For example, a signal that the shared communication device can transmit using the sharable resource is limited to a signal including data having a higher channel access priority class (that is, higher priority) than the data transmitted by the first terminal device 200. May be done. Further, the signals that the shared communication device can transmit using the sharable resource may be limited to the control signal/control channel. Further, the signal that the shared communication device can transmit using the sharable resource may be limited to a signal including communication parameters to be used in the sharable resource described later.
[0101]
　<3.3. Content of
　sharable resource information > The sharable resource information may include various kinds of information. The sharable resource information includes information indicating the wireless resource that has acquired the access right. Furthermore, the sharable resource information may include information indicating a wireless resource to be used.
[0102]
　(1) Information indicating the wireless resource that has acquired the access right
　For example, the sharable resource information may include information indicating the wireless resource that the first terminal device 200 has acquired the access right. In that case, the sharable resource information includes information indicating the frequency of the radio resource for which the first terminal device 200 has acquired the access right and information indicating the time. This allows the shared communication device to recognize the wireless resource for which the first terminal device 200 has acquired the access right.
[0103]
　Of the information indicating the wireless resource for which the first terminal device 200 has acquired the access right, attention is focused on time information. The information indicating the time of the wireless resource for which the first terminal device 200 has acquired the access right is information indicating the time (that is, COT) in which the channel may be occupied. The information indicating the COT includes information indicating the start timing, the end timing, and/or the length of the COT. An example will be described below.
[0104]
　For example, the sharable resource information may include information indicating an interval from the time resource at which the sharable resource information is transmitted to the last time resource of the radio resource for which the first terminal device 200 has acquired the access right. In other words, the sharable resource information includes information indicating the remaining time of COT based on the time resource at which the sharable resource information is transmitted. Here, the time resource is, for example, a symbol, a slot and/or a subframe, and the information indicating the interval is, for example, the number of symbols, the number of slots and/or the number of subframes. The shared communication device adds the symbol number, slot number, and/or subframe number to the symbol number, slot number, and/or subframe number that received the resource information, so that the first terminal device 200 can access The last symbol, slot and/or subframe of the acquired radio resource can be recognized.
[0105]
　For example, the sharable resource information may include information indicating the last time resource of the wireless resource for which the first terminal device 200 has acquired the access right. The time resource here is, for example, a symbol, a slot and/or a subframe, and the information indicating the time resource is, for example, a symbol number, a slot number and/or a subframe number.
[0106]
　For example, the sharable resource information may include information indicating the first time resource of the wireless resource for which the first terminal device 200 has acquired the access right. Here, the time resource is, for example, a symbol, a slot and/or a subframe, and the information indicating the time resource is, for example, a symbol number, a slot number and/or a subframe number.
[0107]
　For example, the sharable resource information may include information indicating the time length (that is, the COT length) of the wireless resource for which the first terminal device 200 has acquired the access right. However, if this information is already known to the shared communication device, it may not be included in the sharable resource information and transmitted. For example, if the length of COT is defined by the channel access priority class, the sharable resource information may include information indicating the channel access priority class.
[0108]
　The example of the information indicating the COT has been described above.
[0109]
　(2) Information indicating radio resource to be used
　For example, the sharable resource information is the radio resource (the radio resource that the first terminal device 200 plans to use, out of the radio resources for which the first terminal device 200 has acquired the access right). Hereinafter, it may also include information indicating a radio resource to be used). In that case, the sharable resource information is the information indicating the frequency and the time indicating the frequency of the wireless resource that the first terminal device 200 is going to use, of the wireless resources for which the first terminal device 200 has acquired the access right. including. By referring to this information, the shared communication device can recognize a wireless resource that the first terminal device 200 does not plan to use. Therefore, the shared communication device can efficiently access the sharable resource, such as accessing the wireless resource that the first terminal device 200 does not plan to use.
[0110]
　Of the information indicating the wireless resources scheduled to be used, attention is paid to time information. The information indicating the time of the wireless resource to be used indicates the start timing, end timing, and/or length of the time resource to be used (that is, the time resource to be used by the first terminal device 200 of the COT). Contains the information to indicate.
[0111]
　Note that the shared communication device can use the sharable resource even if the information indicating the wireless resource to be used is not provided. If the information indicating the wireless resource to be used is not provided, the shared communication device performs random back-up based on the information indicating the COT, regardless of whether the first terminal device 200 uses or does not use the wireless resource. Perform carrier sense without turning off. Then, when the first terminal device 200 finishes using the channel, the shared communication device detects the vacancy of the channel and starts using the sharable resource.
[0112]
　Further, the radio resource to be used may be designated by the base station device 100 using RRC signaling or the like. In that case, the base station apparatus 100 can grasp the wireless resource to be used in advance, even if the information indicating the wireless resource to be used is not provided.
[0113]
　<3.4. Shareable Resource Information Transmission Means>
　(1) Time Resource at which Shareable Resource Information is Transmitted
　The first terminal device 200 (for example, the access right sharing unit 241) continuously uses a part of the time resources. Sharable resource information may be transmitted in the resource.
[0114]
　For example, the first terminal device 200 may transmit the sharable resource information in the first time resource of the time resources that are continuously used. In this case, it is desirable that the sharable resource information includes at least information indicating the end timing of COT and information indicating the end timing of the wireless resource to be used. As a result, the shared communication device can recognize the wireless resource from the end timing of the scheduled wireless resource to the end timing of the COT as a sharable resource.
[0115]
　For example, the first terminal device 200 may transmit the sharable resource information in the time resource that is behind the time resource that is continuously used. In that case, it is desirable that the sharable resource information includes at least information indicating the end timing of COT. This allows the shared communication device to share the access right acquired by the first terminal device 200 until the timing of ending the COT.
[0116]
　In either case, the shared communication device can recognize the sharable resource with a minimum overhead.
[0117]
　The first terminal device 200 (for example, the access right sharing unit 241) may transmit the sharable resource information in all the time resources of the time resources that are continuously used. In this case, even if the shared communication device fails to receive the sharable resource information in some time resources, the shared communication device receives the sharable resource information in other time resources and acquires it by the first terminal device 200. It becomes possible to share the access right.
[0118]
　Hereinafter, with reference to FIGS. 6 and 7, the use of the sharable resource by the shared communication device when the sharable resource information is transmitted in all the time resources of the continuously used time resources will be described.
[0119]
　FIG. 6 is a diagram for explaining an example of sharing access rights according to the present embodiment. In the example shown in FIG. 6, the base station device 100 corresponds to a shared communication device. The upper part of FIG. 6 illustrates carrier sense performed by the base station device 100 and signals transmitted by the base station device 100. The lower part of FIG. 6 illustrates carrier sense performed by the first terminal apparatus 200 and signals transmitted by the first terminal apparatus 200. The rectangle described as DL is a time resource for transmitting a downlink signal. The rectangle described as UL is a time resource in which the downlink signal is transmitted.
[0120]
　As illustrated in FIG. 6, the first terminal device 200 first performs carrier sense using random backoff to acquire an access right. Next, the first terminal device 200 transmits an uplink signal within the COT based on the acquired access right. At that time, the first terminal apparatus 200 transmits the sharable resource information in uplink on all the time resources of the time resources that are continuously used. In the example illustrated in FIG. 6, as the sharable resource information, information indicating the remaining time of COT based on the time resource at which the sharable resource information is transmitted is transmitted. In the example shown in FIG. 6, the first terminal device 200 has access rights to eight time resources. Then, the first terminal device 200 performs uplink transmission of sharable resource information indicating that the first terminal device 200 has the access right to the remaining seven time resources.
[0121]
　After that, the first terminal device 200 can share that the second, third, and fourth time resources have access rights to the remaining six, five, and four time resources. The resource information is transmitted in the uplink. The base station device 100 can recognize the remaining time of the COT based on the sharable resource information. The first terminal device 200 stops the transmission of the uplink signal lastly after transmitting the fourth uplink signal. The base station apparatus 100 recognizes a vacant channel by carrier sense that does not use random backoff in the fifth time resource. That is, the base station device 100 recognizes that the wireless resource from the fifth time resource to the timing of the end of COT can be used. By this means, as shown in FIG. 6, base station apparatus 100 can transmit downlink signals using sharable resources.
[0122]
　The base station device 100 may perform channel access without performing carrier sense in the first place. An example in that case is shown in FIG. FIG. 7 is a diagram for explaining an example of sharing the access right according to the present embodiment. The example shown in FIG. 7 is the same as the example shown in FIG. 6 except that the base station apparatus 100 does not perform carrier sense.
[0123]
　(2) Physical channel for transmitting sharable resource information
　The first terminal device 200 (for example, the access right sharing unit 241) can transmit the sharable resource information using various physical channels.
[0124]
　-Physical channel same as the physical channel used for data transmission
　The first terminal device 200 may transmit the sharable resource information using the physical channel used for data transmission. Examples of such physical channels include PUSCH (Physical Uplink Shared Channel) and PSSCH (Physical Sidelink Shared Channel). In this case, the first terminal device 200 can collectively apply signal processing such as coding to the data and the sharable resource information. Therefore, resource efficiency can be improved.
[0125]
　-Physical Channel Different from Physical Channel Used for Data Transmission
　The first terminal device 200 may transmit the sharable resource information using a physical channel different from the physical channel used for data transmission. Specifically, the first terminal device 200 sets a physical channel used for data transmission and a physical channel used for transmission of sharable resource information as TDM (Time Division Multiplexing) or FDM (Frequency Division Multiplexing). Then, the data is multiplexed and transmitted. Therefore, the first terminal device 200 can apply different MCSs or coding methods to the data and the sharable resource information to make the target error rate and the delay request different. When the sharable resource information is continuously transmitted in continuous time resources, the information on the physical channel used for transmitting the sharable resource information is the same between the continuous time resources. That is, it can be handled as repeated transmission. Therefore, when sharable resource information is different between consecutive time resources, soft-combining of physical channels is facilitated, and reception quality can be improved.
[0126]
　Examples of the physical channel different from the physical channel used for data transmission include a physical channel used for transmission of control information. Examples of such physical channels include PUCCH (Physical Uplink Control Channel) and PSCCH (Physical Sidelink Control Channel).
[0127]
　-Physical Channel Receivable Common to Different Operators
　The first terminal device 200 may transmit the sharable resource information using a physical channel (or physical signal) commonly receivable between different operators. .. The first terminal device 200 broadcasts the sharable resource information using the physical channel. Then, the base station device and the terminal device of an operator different from the operator who provides the wireless service to the first terminal device 200 can receive the sharable resource information. That is, the base station device and the terminal device of different operators can recognize the wireless resource for which the access right is acquired by the first terminal device 200. Therefore, the opportunity and accuracy of carrier sense by the base station device and the terminal device of different operators are improved. Also, coordination between different operators becomes easy.
[0128]
　<3.5. Sharing by Second Terminal Device> In the
　following, sharing of the access right by the second terminal device 200 will be described in detail.
[0129]
　(1) Type
　of sharing of
　access right- Sharing of access right via the base station apparatus 100 Sharing of the access right may be performed via the base station apparatus 100. In that case, the first terminal device 200 transmits the sharable resource information to the base station device 100 in the uplink. Then, as described in Section 3.2 (1), the second terminal device 200 transmits the signal using the sharable resource based on the instruction from the base station device 100. This point will be described with reference to FIG.
[0130]
　FIG. 8 is a diagram for explaining an example of sharing the access right according to the present embodiment. In the example shown in FIG. 8, the base station device 100 and the second terminal device 200 correspond to the shared communication device. The upper part of FIG. 8 illustrates carrier sense performed by the base station device 100 and signals transmitted by the base station device 100. The middle part of FIG. 8 shows carrier sense performed by the first terminal apparatus 200 and signals transmitted by the first terminal apparatus 200. The lower part of FIG. 8 shows carrier sense performed by the second terminal apparatus 200 and signals transmitted by the second terminal apparatus 200. The rectangle described as DL is a time resource for transmitting a downlink signal. The rectangle described as UL is a time resource in which the downlink signal is transmitted.
[0131]
　As shown in FIG. 8, the first terminal device 200 first performs carrier sense using random backoff to acquire an access right. Next, the first terminal device 200 transmits an uplink signal within the COT based on the acquired access right. At that time, the first terminal apparatus 200 transmits the sharable resource information in uplink on all the time resources of the time resources that are continuously used. In the example shown in FIG. 8, as the sharable resource information, information indicating the remaining time of COT based on the time resource at which the sharable resource information is transmitted is transmitted. In the example illustrated in FIG. 8, the first terminal device 200 has access rights to eight time resources. Then, the first terminal device 200 performs uplink transmission of sharable resource information indicating that the first terminal device 200 has the access right to the remaining seven time resources.
[0132]
　After that, the first terminal device 200 performs uplink transmission of sharable resource information indicating that the second terminal has access rights to the remaining six time resources in the second time resource. The base station device 100 can recognize the remaining time of the COT based on the sharable resource information. The first terminal device 200 stops the transmission of the uplink signal lastly after transmitting the second uplink signal. The base station apparatus 100 recognizes a vacant channel by carrier sense that does not use random backoff in the third time resource. That is, the base station device 100 recognizes that the wireless resource from the third time resource to the timing of the end of COT can be used.
[0133]
　Base station apparatus 100 transmits downlink signals using the third to sixth time resources of the sharable resources. In addition, the base station device 100 instructs the second terminal device 200 using the uplink grant to perform uplink transmission in the seventh and eighth time resources of the sharable resources. Then, the second terminal device 200 performs carrier sensing without using random backoff, and then transmits an uplink signal using the seventh and eighth time resources of the sharable resources.
[0134]
　-Direct access right sharing
　Access right sharing may be done directly. In that case, the first terminal device 200 transmits the sharable resource information to the second terminal device 200. Typically, the first terminal device 200 may transmit the sharable resource information to the second terminal device 200 by a side link. The transmission means to the second terminal device 200 is not limited to the side link. For example, the first terminal device 200 may include the sharable resource information in the reference signal for measuring the inter-terminal device interference and transmit the reference signal. Then, as described in Section 3.2 (2), the second terminal device 200 transmits a signal using the sharable resource based on the received sharable resource information. In this case, the second terminal device 200 will perform grant-free transmission. This point will be described with reference to FIG.
[0135]
　FIG. 9 is a diagram for explaining an example of sharing an access right according to the present embodiment. In the example shown in FIG. 9, the second terminal device 200 corresponds to a shared communication device. The upper part of FIG. 9 shows carrier sense performed by the base station apparatus 100 and signals transmitted by the base station apparatus 100. The middle part of FIG. 9 shows carrier sense performed by the first terminal apparatus 200 and a signal transmitted by the first terminal apparatus 200. The lower part of FIG. 9 illustrates carrier sense performed by the second terminal device 200 and signals transmitted by the second terminal device 200. The rectangle described as UL is a time resource in which the downlink signal is transmitted. The rectangle described as SL is a time resource in which the sidelink signal is transmitted.
[0136]
　As shown in FIG. 9, the first terminal device 200 first performs carrier sense using random backoff to acquire an access right. Next, the first terminal device 200 transmits the uplink signal and the sidelink signal in the COT based on the acquired access right. At that time, the first terminal device 200 performs uplink transmission and side link transmission of the sharable resource information in all time resources of the time resources that are continuously used. In the example shown in FIG. 9, as the sharable resource information, information indicating the remaining time of the COT based on the time resource at which the sharable resource information is transmitted is transmitted. In the example shown in FIG. 9, the first terminal device 200 has access rights to eight time resources. Then, the first terminal device 200 performs uplink transmission and side link transmission of sharable resource information indicating that the first terminal 200 has access to the remaining seven time resources.
[0137]
　After that, the first terminal device 200 performs uplink transmission and side link transmission of sharable resource information indicating that the second terminal has access rights to the remaining six time resources in the second time resource. The second terminal device 200 can recognize the remaining time of the COT based on the sharable resource information transmitted by the side link. The first terminal apparatus 200 stops the transmission of the uplink signal and the sidelink signal lastly after transmitting the second uplink signal and the sidelink signal. The second terminal device 200 recognizes the vacancy of the channel by carrier sense that does not use random backoff in the third time resource. That is, the second terminal device 200 recognizes that the wireless resource from the third time resource to the timing of the end of COT can be used. By this means, as shown in FIG. 9, second terminal apparatus 200 can transmit an uplink signal using a sharable resource. At that time, the second terminal device 200, similarly to the first terminal device 200, transmits the sharable resource information in the uplink. By this means, for example, after the second terminal device 200 finishes uplink transmission, the base station device 100 can transmit downlink signals using sharable resources.
[0138]
　(2) Range in which
　the access right can be shared The second terminal device 200 (for example, the communication processing unit 243) can share the sharable resource when the degree of similarity of the communication environment with the first terminal device 200 exceeds a predetermined value. Based on the information, signals are transmitted using sharable resources. This is because it is considered that the higher the degree of similarity between the communication environments of the first terminal device 200 and the second terminal device, the more similar the results of carrier sense. In other words, the higher the degree of similarity between the communication environments of the first terminal device 200 and the second terminal device 200, the higher the possibility that the signal transmitted based on the access right will have a similar effect on the surroundings. is there. By operating the terminal device 200 satisfying this condition as the second terminal device 200, when the second terminal device 200 transmits a signal using the sharable resource, it is possible to give unexpected interference to the surroundings. Can be prevented.
[0139]
　The degree of similarity of the communication environment may be determined based on the information indicating the distance between the terminal devices 200. For example, whether or not the degree of similarity in communication environment exceeds a predetermined value can be determined based on whether the path loss between the terminal devices 200 or the geographical distance between the terminal devices 200 is less than or equal to a predetermined value. This point will be specifically described with reference to FIG.
[0140]
　FIG. 10 is a diagram for explaining sharing of access right by the second terminal device 200 according to the present embodiment. As illustrated in FIG. 10, the terminal devices 200A, 200B, and 200C are located in the cell 11 operated by the base station device 100, and each communicates with the base station device 100. There is a high possibility that the influence on the surroundings is similar between the terminal devices 200 having the close transmission points. Therefore, it is desirable that a plurality of terminal devices 200 that are close in transmission point share the access right. In the example shown in FIG. 10, it is assumed that the terminal device 200A functions as the first terminal device 200 and acquires the access right. 200 A of terminal devices can detect the signal transmitted from the communication device located in the carrier sense range 12 by carrier sense. Note that the carrier sense range 12 is a range in which the terminal device 200A can exert an influence (that is, interference) when the signal is transmitted, and depends on the transmission power assumed to be used when the terminal device 200A transmits the signal. Be scaled. Since the terminal device 200B is located within the carrier sense range 12, the influence on the surroundings is likely to be the same as that of the terminal device 200A. Therefore, it is desirable that the terminal device 200B function as the second terminal device 200 and share the access right acquired by the terminal device 200A. On the other hand, since the terminal device 200C is located outside the carrier sense range 12, the influence on the surroundings is likely to be different from that of the terminal device 200A. Therefore, it is desirable that the terminal device 200C does not share the access right acquired by the terminal device 200A.
[0141]
　The degree of similarity of the communication environment may be determined based on the information regarding the interference situation. For example, whether or not the degree of similarity in communication environment exceeds a predetermined value can be determined by whether or not the difference between the RSSI (Received Signal Strength Indicator) or the channel congestion degree between the terminal devices 200 is a predetermined value or less.
[0142]
　The degree of similarity of the communication environment may be determined based on the information regarding the destination. For example, whether or not the degree of similarity in the communication environment exceeds a predetermined value can be determined depending on whether or not the difference between the direction of the transmission destination or the direction of the beam between the terminal devices 200 is less than or equal to the predetermined value. It should be noted that this index is particularly useful when carrier sensing using beam forming is performed.
[0143]
　A plurality of terminal devices 200 that can share the access right may be grouped. Grouping is performed based on, for example, the degree of similarity of the communication environment described above. Grouping is typically performed by the base station device 100 (for example, the access right sharing unit 151). Then, each terminal device 200 is set by the base station device 100 with information indicating which group it belongs to.
[0144]
　(3) Sharable Resource Information
　Regarding the sharing of the access right by the second terminal device 200, information that can be included in the sharable resource information will be described below.
[0145]
　Information about communication environment The
　sharable resource information may include the above-mentioned information about communication environment. As a result, the second terminal device 200 can calculate the similarity of the communication environment with the first terminal device 200 based on the received sharable resource information, and determine whether the access right can be shared. It will be possible.
[0146]
　For example, the sharable resource information may include information indicating the geographical position or transmission power of the first terminal device 200. Accordingly, the second terminal device 200 can determine the degree of similarity of the communication environment based on the information indicating the distance between the terminal devices 200.
[0147]
　For example, the sharable resource information may include information indicating the RSSI or the channel congestion degree of the first terminal device 200. Thereby, the second terminal device 200 can determine the degree of similarity of the communication environment based on the information on the interference situation.
[0148]
　For example, the sharable resource information may include information indicating the direction of the transmission destination of the first terminal device 200 or the direction of the beam. As a result, the second terminal device 200 can determine the degree of similarity of the communication environment based on the information regarding the transmission destination.
[0149]
　-Group information
　sharable resource information may include information indicating a group that can share an access right. The information indicating the group that can share the access right can include the ID of each of the plurality of terminal devices 200 that can share the access right, identification information such as C-RNTI, and the ID of the group. The second terminal device 200 can share the access right based on the received sharable resource information by referring to the information indicating the group that can share the access right included in the received sharable resource information. It can be determined whether or not.
[0150]
　For example, the first terminal device 200 includes the information indicating the group to which the first terminal device 200 belongs in the sharable resource information and transmits the sharable resource information. If the group to which the first terminal device 200 belongs is the same as itself, the second terminal device 200 determines that the access right acquired by the first terminal device 200 can be shared.
[0151]
　(4) Communication Parameter
　The first terminal device 200 and the second terminal device 200 share communication parameters to be used in the sharable resource.
[0152]
　The first terminal device 200 and the second terminal device 200 may directly share communication parameters to be used in the sharable resource by D2D communication. Alternatively, the first terminal device 200 and the second terminal device 200 may indirectly share the communication parameter to be used in the sharable resource via the base station device 100. In addition, the base station device 100 may determine the communication parameter to be used in the sharable resource and transmit it to each terminal device 200.
[0153]
　An example of information that can be included in the communication parameter will be described below.
[0154]
　-Upper limit of transmission power The
　communication parameter to be used in the sharable resource may include information indicating the upper limit of transmission power that the second terminal device 200 can use in the sharable resource.
[0155]
　The second terminal device 200 (for example, the communication processing unit 243) transmits a signal with a transmission power that is equal to or lower than the transmission power assumed in the carrier sense performed when the first terminal device 200 acquires the access right. For example, in the example illustrated in FIG. 10, the terminal device 200B transmits a signal in the sharable resource by using a transmission power that is equal to or lower than the transmission power assumed in the carrier sense performed when the terminal device 200A acquires the access right. Send. By this means, it is possible to prevent unexpected interference from occurring when the second terminal device 200 transmits a signal in the sharable resource.
[0156]
　-Parameters for channel access
　Communication parameters to be used in the sharable resource may include parameters for channel access.
[0157]
　It is desirable that the first terminal device 200 and the second terminal device 200 use the same parameters for channel access. Further, when at least part of the parameters for channel access is updated, it is desirable that the updated parameters for channel access are shared.
[0158]
　Parameters for channel access include a collision window size and a carrier sense threshold. The parameters for channel access include maximum transmission power, antenna gain, and beam gain.
[0159]
　(5) Supplement
　There may be a plurality of second terminal devices 200. In that case, the plurality of second terminal devices 200 use the sharable resources in order, for example. When the plurality of second terminal devices 200 support non-orthogonal multiple access (NOMA) communication, even if signals are non-orthogonal (NOMA)-multiplexed and transmitted in the same sharable resource. Good.
[0160]
　Further, when the first terminal device 200 and the second terminal device 200 support NOMA communication, the signals may be non-orthogonal-multiplexed and transmitted in the same radio resource. In this case, the second terminal device 200 can transmit the signal without waiting for the first terminal device 200 to finish using the radio resource.
[0161]
　<3.6. Process Flow>
　(1) flow of the processing by the first terminal device 200
　Figure 11 is a flow chart showing an example of a shared processing flow of the access rights is performed by the first terminal device 200 according to this embodiment ..
[0162]
　As shown in FIG. 11, first, the communication processing unit 243 performs carrier sense using random backoff and acquires an access right (step S102). Next, the access right sharing unit 241 performs uplink transmission and/or side link transmission of the signal to be transmitted and the sharable resource information in the radio resource for which the access right has been acquired (step S104).
[0163]
　(2) the flow of processing by the base station apparatus 100
　Figure 12 is a flowchart illustrating an example of a shared processing flow of the access rights is performed by the base station apparatus 100 according to this embodiment.
[0164]
　As shown in FIG. 12, first, the access right sharing unit 151 receives the sharable resource information transmitted in uplink from the first terminal device 200 (step S202). Next, the communication processing unit 153 performs carrier sense on the sharable resource without using random backoff, and recognizes the end of transmission of the first terminal device 200 (step S204). Next, the communication processing unit 153 transmits the downlink signal in the sharable resource (step S206). Next, the access right sharing unit 151 transmits the uplink grant instructing the uplink transmission in the sharable resource to the second terminal device 200 (step S208). Then, the communication processing unit 153 receives the uplink signal from the second terminal device 200 in the sharable resource (step S210).
[0165]
　The above steps S206 and S208 may be executed simultaneously, or the order may be reversed.
[0166]
　(3) a second flow of processing by the terminal apparatus 200
　Figure 13 is a flowchart illustrating an example of a shared processing flow of the access rights to be executed by the second terminal device 200 according to this embodiment. This flow shows an example of the case where the sharing of the access right described above with reference to FIG. 8 is performed via the base station device 100.
[0167]
　As shown in FIG. 13, first, the access right sharing unit 241 uses a sharable resource for which an access right has been acquired by the first terminal apparatus 200, to transmit an
uplink grant instructing uplink transmission to the base station apparatus 100. (Step S302). Then, the communication processing unit 243 transmits the uplink signal in the sharable resource according to the uplink grant (step S304).
[0168]
　FIG. 14 is a flowchart showing an example of the flow of access right sharing processing executed by the second terminal device 200 according to the present embodiment. This flow shows an example of the case where the sharing of the access right is directly performed as described above with reference to FIG.
[0169]
　As shown in FIG. 14, first, the access right sharing unit 241 receives the sharable resource information transmitted from the first terminal device 200 by the side link (step S402). Next, the communication processing unit 243 performs carrier sense on the sharable resource without using random backoff, and recognizes the end of transmission of the first terminal device 200 (step S404). Then, the communication processing unit 243 transmits the side link signal or the uplink signal in the sharable resource (step S406).
[0170]
　<<4. Application Examples>>
　The technology according to the present disclosure can be applied to various products. For example, the base station apparatus 100 may be realized as an eNB (evolved Node B) of any type such as a macro eNB or a small eNB. A small eNB may be an eNB that covers a cell smaller than a macro cell, such as a pico eNB, a micro eNB or a home (femto) eNB. Instead, the base station device 100 may be realized as another type of base station such as a NodeB or a BTS (Base Transceiver Station). The base station device 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 in different locations from the main body. In addition, various types of terminals described below may operate as the base station device 100 by temporarily or semipermanently executing the base station function.
[0171]
　Further, for example, the terminal device 200 is a mobile terminal such as a smartphone, a tablet PC (Personal Computer), a notebook PC, a portable game terminal, a portable/dongle type mobile router or a digital camera, or an in-vehicle terminal such as a car navigation device. May be realized as. In addition, the terminal device 200 may be realized as a terminal that performs M2M (Machine To Machine) communication (also referred to as an MTC (Machine Type Communication) terminal). Further, the terminal device 200 may be a wireless communication module mounted on these terminals (for example, an integrated circuit module configured by one die).
[0172]
　　<4.1. Application Example Regarding Base Station Device>
　　　(First Application Example)
　FIG. 15 is a block diagram showing a first example of a schematic configuration of an eNB to which the technology 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.
[0173]
　Each of the antennas 810 has a single or a plurality of antenna elements (for example, a plurality of antenna elements forming a MIMO antenna), and is used for the base station apparatus 820 to transmit and receive radio signals. The eNB 800 includes a plurality of antennas 810 as illustrated in FIG. 15, and the plurality of antennas 810 may correspond to a plurality of frequency bands used by the eNB 800, respectively. Although FIG. 15 shows an example in which the eNB 800 has a plurality of antennas 810, the eNB 800 may have a single antenna 810.
[0174]
　The base station device 820 includes a controller 821, a memory 822, a network interface 823, and a wireless communication interface 825.
[0175]
　The controller 821 may be, for example, a CPU or a DSP, and operates various functions of the upper layer of the base station device 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 may transfer the generated bundled packet. Further, the controller 821 is a logic for executing control such as radio resource management (Radio Resource Control), radio bearer control (Radio Bearer Control), mobility management (Mobility Management), admission control (Admission Control) or scheduling (Scheduling). It may have a general function. Further, the control may be executed in cooperation with the surrounding eNB or 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, etc.).
[0176]
　The network interface 823 is a communication interface for connecting the base station device 820 to the core network 824. Controller 821 may communicate with core network nodes or other eNBs via network interface 823. In that case, the eNB 800 and the core network node or another eNB may be connected to each other by a logical interface (for example, the S1 interface or the X2 interface). The network interface 823 may be a wired communication interface or a wireless communication interface for wireless backhaul. When the network interface 823 is a wireless communication interface, the network interface 823 may use a higher frequency band for wireless communication than the frequency band used by the wireless communication interface 825.
[0177]
　The wireless communication interface 825 supports a cellular communication scheme 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, encoding/decoding, modulation/demodulation, multiplexing/demultiplexing, and the like, and each layer (for example, L1, MAC (Medium Access Control), RLC (Radio Link Control), and PDCP). (Packet Data Convergence Protocol). The BB processor 826 may have some or all of the logical functions described above instead of the controller 821. The BB processor 826 may be a module that includes a memory that stores a communication control program, a processor that executes the program, and a related circuit. The function of the BB processor 826 may be changed by updating the program. Good. Further, the module may be a card or a blade inserted into the slot of the base station device 820, or 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 wireless signals via the antenna 810.
[0178]
　The wireless communication interface 825 includes a plurality of BB processors 826 as shown in FIG. 15, and the plurality of BB processors 826 may respectively correspond to a plurality of frequency bands used by the eNB 800, for example. The wireless communication interface 825 may include a plurality of RF circuits 827 as shown in FIG. 15, and the plurality of RF circuits 827 may correspond to, for example, a plurality of antenna elements. Although FIG. 15 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. But it's okay.
[0179]
　In the eNB 800 illustrated in FIG. 15, one or more components (access right sharing unit 151 and/or communication processing unit 153) included in the control unit 150 described with reference to FIG. 4 are implemented in the wireless communication interface 825. May be done. Alternatively, at least some of these components may be implemented in controller 821. As an example, the eNB 800 includes a module including a part (for example, the BB processor 826) or all of the wireless communication interface 825 and/or the controller 821, and the one or more components may be mounted in the module. Good. In this case, the module stores a program for causing the processor to function as the one or more constituent elements (in other words, a program for causing the processor to execute the operation of the one or more constituent elements). You may run the program. As another example, even if a program for causing the processor to function as one or more components described above is installed in the eNB 800 and the wireless communication interface 825 (for example, the 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 causing a processor to function as the one or more components is provided. May be. A readable recording medium recording the above program may be provided.
[0180]
　Further, in the eNB 800 illustrated in FIG. 15, the wireless communication unit 120 described with reference to FIG. 4 may be mounted in the wireless communication interface 825 (for example, the RF circuit 827). 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. The storage unit 140 may be implemented in the memory 822.
[0181]
　　　(Second Application Example)
　FIG. 16 is a block diagram showing a second example of a schematic configuration of an eNB to which the technology according to the present disclosure can be applied. The eNB 830 has one or more antennas 840, a base station device 850, and an RRH 860. Each antenna 840 and RRH 860 may be connected to each other via an RF cable. Further, the base station device 850 and the RRH 860 can be connected to each other by a high speed line such as an optical fiber cable.
[0182]
　Each of the antennas 840 has a single or a plurality of antenna elements (for example, a plurality of antenna elements forming a MIMO antenna), and is used for transmitting and receiving radio signals by the RRH 860. The eNB 830 includes a plurality of antennas 840 as illustrated in FIG. 16, and the plurality of antennas 840 may correspond to a plurality of frequency bands used by the eNB 830, for example. 16 illustrates an example in which the eNB 830 has a plurality of antennas 840, the eNB 830 may have a single antenna 840.
[0183]
　The base station device 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, the memory 852, and the network interface 853 are the same as the controller 821, the memory 822, and the network interface 823 described with reference to FIG.
[0184]
　The wireless communication interface 855 supports a cellular communication scheme such as LTE or LTE-Advanced, and provides a wireless connection to a terminal located in a sector corresponding to the RRH 860 via the RRH 860 and the antenna 840. The wireless communication interface 855 may typically include a BB processor 856 or the like. The BB processor 856 is the same as the BB processor 826 described with reference to FIG. 15 except that it is connected to the RF circuit 864 of the RRH 860 via the connection interface 857. The wireless communication interface 855 includes a plurality of BB processors 856 as shown in FIG. 16, and the plurality of BB processors 856 may respectively correspond to a plurality of frequency bands used by the eNB 830, for example. 16 shows the 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.
[0185]
　The connection interface 857 is an interface for connecting the base station device 850 (radio communication interface 855) to the RRH 860. The connection interface 857 may be a communication module for communication on the high-speed line connecting the base station device 850 (radio communication interface 855) and the RRH 860.
[0186]
　The RRH 860 also includes a connection interface 861 and a wireless communication interface 863.
[0187]
　The connection interface 861 is an interface for connecting the RRH 860 (radio 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.
[0188]
　The wireless communication interface 863 transmits and receives wireless signals via the antenna 840. The wireless communication interface 863 may typically include an RF circuit 864 or the like. The RF circuit 864 may include a mixer, a filter, an amplifier, and the like, and transmits and receives a wireless signal through the antenna 840. The wireless communication interface 863 includes a plurality of RF circuits 864 as shown in FIG. 16, and the plurality of RF circuits 864 may correspond to a plurality of antenna elements, respectively. 16 illustrates 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.
[0189]
　In the eNB 830 illustrated in FIG. 16, one or more components (access right sharing unit 151 and/or communication processing unit 153) included in the control unit 150 described with reference to FIG. 4 are wireless communication interfaces 855 and/or Alternatively, it may be implemented in the wireless communication interface 863. Alternatively, at least some of these components may be implemented in controller 851. As an example, the eNB 830 includes a module including a part (for example, the BB processor 856) or all of the wireless communication interface 855 and/or the controller 851, and the one or more components may be mounted in the module. Good. In this case, the module stores a program for causing the processor to function as the one or more constituent elements (in other words, a program for causing the processor to execute the operation of the one or more constituent elements). You may run the program. As another example, a program for causing a processor to function as the one or more components may be installed in the eNB 830, and the wireless communication interface 855 (for example, the BB processor 856) and/or the controller 851 may execute 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 causing a processor to function as the one or more components is provided. May be. A readable recording medium recording the above program may be provided.
[0190]
　Further, in the eNB 830 shown in FIG. 16, for example, the wireless communication unit 120 described with reference to FIG. 4 may be implemented in the wireless communication interface 863 (for example, the RF circuit 864). 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 implemented in the memory 852.
[0191]
　　<4.2. Application Example Regarding Terminal Device>
　　　(First Application Example)
　FIG. 17 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 antennas 916, a bus 917, a battery 918 and an auxiliary controller 919.
[0192]
　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. The memory 902 includes RAM and ROM and stores programs and data executed by the 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.
[0193]
　The camera 906 has, for example, an imaging element such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor), and generates a captured image. The sensor 907 may include a sensor group such as a positioning sensor, a gyro sensor, a geomagnetic sensor, and an acceleration sensor, for example. The microphone 908 converts a voice input to the smartphone 900 into a voice signal. The input device 909 includes, for example, a touch sensor that detects a touch on the screen of the display device 910, a keypad, a keyboard, a button or a switch, and receives an operation or information input from a 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 audio signal output from the smartphone 900 into audio.
[0194]
　The wireless communication interface 912 supports a cellular communication method such as LTE or LTE-Advanced and executes 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, encoding/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 a wireless signal through the antenna 916. The wireless communication interface 912 may be a one-chip module in which the BB processor 913 and the 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. 17 illustrates 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. But it's okay.
[0195]
　Further, the wireless communication interface 912 may support other types of wireless communication systems such as a short-range wireless communication system, a close proximity wireless communication system, and 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.
[0196]
　Each of the antenna switches 915 switches the connection destination of the antenna 916 among a plurality of circuits (for example, circuits for different wireless communication systems) included in the wireless communication interface 912.
[0197]
　Each of the antennas 916 has a single or a plurality of antenna elements (for example, a plurality of antenna elements forming a MIMO antenna), and is used for transmitting and receiving radio signals by the radio communication interface 912. The smartphone 900 may have a plurality of antennas 916 as shown in FIG. Note that FIG. 17 illustrates an example in which the smartphone 900 has a plurality of antennas 916, but the smartphone 900 may have a single antenna 916.
[0198]
　Furthermore, the smartphone 900 may include 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.
[0199]
　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 power to each block of the smartphone 900 shown in FIG. 17 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 in the sleep mode, for example.
[0200]
　In the smartphone 900 illustrated in FIG. 17, one or more components (access right sharing unit 241 and/or communication processing unit 243) included in the control unit 240 described with reference to FIG. May be implemented. 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 (eg, the BB processor 913) or all of the wireless communication interface 912, the processor 901, and/or the auxiliary controller 919, and the one or more constituent elements 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 constituent elements (in other words, a program for causing the processor to execute the operation of the one or more constituent elements). You may run the program. As another example, a program for causing a processor to function as one or more components described above is installed in the smartphone 900, and the wireless communication interface 912 (for example, the BB processor 913), the processor 901, and/or the auxiliary controller 919 is included. You may run the program. As described above, the smartphone 900 or the module may be provided as an apparatus including the one or more components, and a program for causing the processor to function as the one or more components may be provided. A readable recording medium recording the above program may be provided.
[0201]
　Further, in the smartphone 900 illustrated in FIG. 17, for example, the wireless communication unit 220 described with reference to FIG. 5 may be implemented in the wireless communication interface 912 (for example, the RF circuit 914). The antenna unit 210 may be mounted on the antenna 916. The storage unit 230 may be implemented in the memory 902.
[0202]
　　　(Second Application Example)
　FIG. 18 is a block diagram showing an example of a schematic configuration of a car navigation device 920 to which the technology 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. Interface 933, one or more antenna switches 936, one or more antennas 937 and a battery 938.
[0203]
　The processor 921 may be, for example, a CPU or a SoC, and controls the navigation function and other functions of the car navigation device 920. The memory 922 includes RAM and ROM and stores programs and data executed by the processor 921.
[0204]
　The GPS module 924 measures the position (eg, latitude, longitude, and altitude) of the car navigation device 920 using GPS signals received from GPS satellites. The sensor 925 may include a sensor group such as a gyro sensor, a geomagnetic sensor, and a barometric pressure sensor, for example. The data interface 926 is connected to the vehicle-mounted network 941 via, for example, a terminal (not shown) and acquires data generated on the vehicle side such as vehicle speed data.
[0205]
　The content player 927 plays the content stored in the storage medium (eg, CD or DVD) inserted in the storage medium interface 928. The input device 929 includes, for example, a touch sensor that detects a touch on the screen of the display device 930, a button, or a switch, and receives 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 a navigation function or an image of reproduced content. The speaker 931 outputs the navigation function or the sound of the reproduced content.
[0206]
　The wireless communication interface 933 supports a cellular communication system such as LTE or LTE-Advanced and executes 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, encoding/decoding, modulation/demodulation, multiplexing/demultiplexing, and the like, and perform 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 a wireless signal through the antenna 937. The wireless communication interface 933 may be a one-chip module in which the BB processor 934 and the 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. 18. 18 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. But it's okay.
[0207]
　Furthermore, the wireless communication interface 933 may support other types of wireless communication systems such as a short-range wireless communication system, a close proximity wireless communication system, and 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.
[0208]
　Each of the antenna switches 936 switches a connection destination of the antenna 937 among a plurality of circuits (for example, circuits for different wireless communication systems) included in the wireless communication interface 933.
[0209]
　Each of the antennas 937 has a single or a plurality of antenna elements (for example, a plurality of antenna elements forming a MIMO antenna), and is used for transmitting and receiving radio signals by the radio communication interface 933. The car navigation device 920 may have a plurality of antennas 937 as shown in FIG. Although FIG. 18 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.
[0210]
　Further, the car navigation device 920 may include 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.
[0211]
　The battery 938 supplies electric power to each block of the car navigation device 920 shown in FIG. 18 via a power supply line partially shown by a broken line in the figure. Further, the battery 938 stores electric power supplied from the vehicle side.
[0212]
　In the car navigation device 920 shown in FIG. 18, one or more components (access right sharing unit 241 and/or communication processing unit 243) included in the control unit 240 described with reference to FIG. 5 are wireless communication interfaces. 933 may be implemented. 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, the BB processor 934) or all and/or the processor 921 of the wireless communication interface 933, and the one or more components are mounted in the module. May be. In this case, the module stores a program for causing the processor to function as the one or more constituent elements (in other words, a program for causing the processor to execute the operation of the one or more constituent elements). You may run the program. As another example, a program for causing a processor to function as one or more components described above 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 the device including the one or more constituent elements, and the program for causing the processor to function as the one or more constituent elements may be provided. Good. A readable recording medium recording the above program may be provided.
[0213]
　Further, in the car navigation device 920 illustrated in FIG. 18, for example, the wireless communication unit 220 described with reference to FIG. 5 may be mounted in the wireless communication interface 933 (for example, the RF circuit 935). The antenna unit 210 may be mounted on the antenna 937. Further, the storage unit 230 may be implemented in the memory 922.
[0214]
　Further, the technology according to the present disclosure may be implemented 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.
[0215]
　<<5. Conclusion>> The
　embodiment of the present disclosure has been described above in detail with reference to FIGS. 1 to 18. As described above, the first terminal device 200 according to the present embodiment is a radio resource that can be used by another communication device among radio resources that have acquired access right by performing carrier sense using random backoff. The sharable resource information indicating is transmitted on the uplink or the side link. As a result, the other communication device can share the access right acquired by the first terminal device 200 and transmit the signal. Here, since the access right has already been acquired by the first terminal device 200, the other communication device performs channel access without performing carrier sense using random backoff. Therefore, compared with the case where carrier sense using random backoff is performed, the waiting time for channel access is reduced, and it becomes possible to improve the utilization efficiency of radio resources.
[0216]
　The preferred embodiments of the present disclosure have been described above in detail with reference to the accompanying drawings, but the technical scope of the present disclosure is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field of the present disclosure can come up with various changes or modifications within the scope of the technical idea described in the claims. Of course, it is understood that the invention also belongs to the technical scope of the present disclosure.
[0217]
　Further, the processes described in the present specification using the flowcharts and sequence diagrams do not necessarily have to be executed in the illustrated order. Some processing steps may be performed in parallel. In addition, additional processing steps may be adopted, and some processing steps may be omitted.
[0218]
　Further, the effects described in the present specification are merely illustrative or exemplary, and are not limiting. That is, the technique according to the present disclosure may have other effects that are apparent to those skilled in the art from the description of the present specification, in addition to or instead of the above effects.
[0219]
　The following configurations also belong to the technical scope of the present disclosure.
(1)
　of the radio resource to gain access by performing carrier sense, the first resource information other communication device indicating the available radio resources, control unit to transmit in the uplink or side links,
comprises a Terminal device.
(2)
　The terminal device according to (1), wherein the first resource information includes information indicating a wireless resource for which the terminal device has acquired an access right.
(3)
　The first resource information includes information indicating an interval from a time resource to which the first resource information is transmitted to a last time resource of a radio resource for which the terminal device has acquired an access right, The terminal device according to (2).
(4)
　The terminal device according to (2) or (3), wherein the first resource information includes information indicating a last time resource of a radio resource for which the terminal device has acquired an access right.
(5)
　The terminal according to any one of (2) to (4), wherein the first resource information includes information indicating a first time resource of a radio resource for which the terminal device has acquired an access right. apparatus.
(6)
　The terminal according to any one of (2) to (5), wherein the first resource information includes information indicating a channel access priority class of a wireless resource for which the terminal device has acquired an access right. apparatus.
(7)
　One of the above (2) to (6), wherein the first resource information includes information indicating a wireless resource that the terminal device is going to use among the wireless resources for which the terminal device has acquired an access right. The terminal device according to the item.
(8)
　The terminal device according to any one of (1) to (7), wherein the control unit transmits the first resource information in a part of time resources that are continuously used. ..
(9)
　The terminal device according to any one of (1) to (7), wherein the control unit transmits the first resource information in all time resources of time resources that are continuously used.
(10)
　The terminal according to any one of (1) to (9), wherein the control unit transmits the first resource information using a physical channel different from a physical channel used for data transmission. apparatus.
(11)
　The terminal device according to any one of (1) to (10), wherein the control unit transmits the first resource information using a physical channel that can be commonly received by different operators. ..
(12) The
　control unit is a second resource indicating a wireless resource that can be used by another communication device other than the other terminal device, out of the wireless resources that the other terminal device performs carrier sense to obtain the access right. The terminal device according to any one of (1) to (11), which transmits a signal using a radio resource that can be used by the other communication device when the resource information is received.
(13)
　The terminal device according to (12), wherein the types of signals that can be transmitted by using the radio resources available to the other communication device are limited.
(14) In
　the above (12) or (13), the control unit transmits a signal with a transmission power that is equal to or lower than the transmission power assumed in the carrier sense performed when the other terminal device acquires the access right. The terminal device described.
(15) The
　control unit transmits a signal using a resource that can be used by the other communication device when the degree of similarity of the communication environment with the other terminal device exceeds a predetermined value. The terminal device according to any one of to (14).
(16)
　The terminal device according to (15), wherein the second resource information includes information about a communication environment.
(17)
　Resource information indicating resources that can be used by communication devices other than the terminal device, of the radio resources that the terminal device has performed carrier sense to obtain the access right, is received from the terminal device, and the other resource information is received. A
base station apparatus comprising: a control unit that uses resources that can be used by a communication apparatus for communication .
(18)
　The base station device according to (17), wherein the control unit transmits a signal using a radio resource that can be used by the other communication device based on the resource information.
(19)
　The control unit transmits, to the terminal device other than the terminal device, a grant message instructing transmission of a signal in a radio resource usable by the other communication device, based on the resource information, (17) The base station device according to 1.
(20)
　transmitting, by uplink or side link, first resource information indicating a radio resource that can be used by another communication device, out of the radio resources obtained by performing carrier sense to obtain an access right
, The method performed by the processor.
Explanation of symbols
[0220]
　1 system
　11 cell
　12 carrier sense range
　20 core network
　30 PDN
　100 base station device
　110 antenna unit
　120 wireless communication unit
　130 network communication unit
　140 storage unit
　150 control unit
　151 access right sharing unit
　153 communication processing unit
　200 terminal device
　210 antenna unit
　220 Wireless communication unit
　230 Storage unit
　240 Control unit
　241 Access right sharing unit
　243 Communication processing unit
The scope of the claims
[Claim 1]
　A
terminal device , comprising: a control unit that transmits first resource information indicating a wireless resource that can be used by another communication device among the wireless resources that have performed carrier sense and acquired an access right, in an uplink or a side link .
[Claim 2]
　The terminal device according to claim 1, wherein the first resource information includes information indicating a wireless resource for which the terminal device has acquired an access right.
[Claim 3]
　The said 1st resource information contains the information which shows the space|interval from the time resource which the said 1st resource information is transmitted to the last time resource of the radio|wireless resource from which the said terminal device acquired the access right. The terminal device described.
[Claim 4]
　The terminal device according to claim 2, wherein the first resource information includes information indicating a last time resource of a wireless resource for which the terminal device has acquired an access right.
[Claim 5]
　The terminal device according to claim 2, wherein the first resource information includes information indicating a first time resource of a wireless resource for which the terminal device has acquired an access right.
[Claim 6]
　The terminal device according to claim 2, wherein the first resource information includes information indicating a channel access priority class of a wireless resource for which the terminal device has acquired an access right.
[Claim 7]
　The terminal device according to claim 2, wherein the first resource information includes information indicating a wireless resource to be used by the terminal device among wireless resources for which the terminal device has acquired an access right.
[Claim 8]
　The terminal device according to claim 1, wherein the control unit transmits the first resource information in a part of time resources that are continuously used.
[Claim 9]
　The terminal device according to claim 1, wherein the control unit transmits the first resource information in all time resources of time resources that are continuously used.
[Claim 10]
　The terminal device according to claim 1, wherein the control unit transmits the first resource information using a physical channel different from a physical channel used for data transmission.
[Claim 11]
　The terminal device according to claim 1, wherein the control unit transmits the first resource information using a physical channel that can be commonly received by different operators.
[Claim 12]
　The control unit displays second resource information indicating radio resources that can be used by another communication device other than the other terminal device among the radio resources that the other terminal device has performed carrier sense to obtain the access right. The terminal device according to claim 1, which, when received, transmits a signal using a radio resource that can be used by the other communication device.
[Claim 13]
　The terminal device according to claim 12, wherein the types of signals that can be transmitted using the radio resources available to the other communication device are limited.
[Claim 14]
　The terminal device according to claim 12, wherein the control unit transmits a signal with a transmission power that is equal to or lower than a transmission power assumed in a carrier sense performed when the other terminal device acquires an access right.
[Claim 15]
　The terminal according to claim 12, wherein the control unit transmits a signal using a resource that can be used by the other communication device when the degree of similarity of the communication environment with the other terminal device exceeds a predetermined value. apparatus.
[Claim 16]
　The terminal device according to claim 15, wherein the second resource information includes information on a communication environment.
[Claim 17]
　Of the wireless resources that the terminal device has performed carrier sense to obtain the access right, resource information indicating resources that can be used by another communication device other than the terminal device is received from the terminal device, and the other communication device is A
base station apparatus comprising: a control unit that uses available resources for communication .
[Claim 18]
　The base station apparatus according to claim 17, wherein the control unit transmits a signal using a radio resource that can be used by the other communication apparatus, based on the resource information.
[Claim 19]
　The control unit, based on the resource information, transmits a grant message instructing the transmission of a signal in a radio resource usable by the other communication device to a terminal device other than the terminal device. The described base station device.
[Claim 20]
　Of the radio resource to gain access by performing carrier sense, the first resource information other communication device of a wireless resource available, be transmitted in the uplink or side links,
including, execution by the processor How to be done.