[0001]The present disclosure relates to a wireless communication device, a communication method, a computer program and a wireless communication system.
Background technique
[0002]In LTE (Long Term Evolution) is, in order to achieve a high data rate reduction, TTI (Transmission Time Interval: transmission time interval) is in the 1 ms. By shortening the TTI, necessary for retransmission control RTT (Round Trip Time: RTT) is shortened, the delay of the system is reduced.
[0003]
　When the TTI is 1 ms, the terminal device is a 4ms time required to decode the data. If the TTI is shorter, even shorter decoding time at the terminal device. When decoding time is shortened at the terminal device, it is expected to provide more effective if the real time property is required strongly.
CITATION
Patent Document
[0004]
Patent Document 1: JP 2009-212597 JP
Summary of the Invention
Problems that the Invention is to Solve
[0005]
　To send and receive data in an existing transmission time interval shorter than the short transmission time interval (short TTI), the length of the short transmission time interval (level) by preparing a plurality of terminal devices the short transmission optimal length You can select a time interval.
[0006]
　In the present disclosure, the length of the existing at the time of transmission and reception of data in a short transmission time interval shorter than the transmission time interval, the optimal short transmission time interval for the terminal device from among the lengths of the short transmission time interval capable of transmitting and receiving data by a novel and improved radio communication apparatus, communication method, proposes a computer program and a wireless communication system.
Means for Solving the Problems
[0007]
　According to the present disclosure, a frame generator for generating a frame including a plurality of subframes, and a transmission unit transmitting the generated frame to the other communication apparatus, in the subframe shorter than one sub-frame period comprising short transmission time interval is transmission time interval, a notification unit for notifying information of a plurality of lengths, the wireless communication device is provided.
[0008]
　According to the present disclosure, which receives a frame consisting of a plurality of sub-frames, within said sub-frame, the short transmission time interval is shorter transmission time interval from one sub-frame period, the information of a plurality of lengths other comprising an acquisition unit that acquires from the communication device, the wireless communication device is provided.
[0009]
　According to the disclosure, and, and transmitting the generated frame to the other communication apparatus, in the subframe, shorter transmission time than one sub-frame period to generate a frame composed of a plurality of sub-frame including short transmission time interval is an interval, and to notify the information of a plurality of lengths, the radio communication method is provided.
[0010]
　According to the present disclosure, the method comprising: receiving a frame including a plurality of sub-frames, within said sub-frame, the short transmission time interval is shorter transmission time interval from one sub-frame period, a plurality of length information includes obtaining from a base station, a radio communication method is provided.
[0011]
　According to the present disclosure, the computer, and generating a frame comprising a plurality of sub-frames, and transmitting the generated frame to the other communication apparatus, within said sub-frame, from one sub-frame period short transmission short transmission time interval is the time interval, and to notify the information of a plurality of lengths, thereby executing the computer program is provided.
[0012]
　According to the present disclosure, the computer, receiving a frame composed of a plurality of sub-frames, within said sub-frame, the short transmission time interval is shorter transmission time interval from one sub-frame period, a plurality of length and obtaining the information from the base station, to the execution, the computer program is provided.
[0013]
　According to the present disclosure includes a first communication apparatus and the second communication device, the first communication apparatus includes a frame generator for generating a frame including a plurality of sub-frames, the generated frame a transmission unit that transmits to the second communication device, within said sub-frame, the short transmission time interval is shorter transmission time interval from one sub-frame period, a plurality of length information to the second communication device comprising a notification unit for notifying to the said second communication device is configured to receive the frame, the short transmission time interval, a plurality of length information from the first communication device within said sub-frame comprising an acquisition unit for acquiring the wireless communication system is provided.
Effect of the invention
[0014]
　According to the present disclosure described above, when transmitting and receiving data in an existing transmission time short short transmission time interval than the interval, the optimum short transmission for the terminal apparatus from among the lengths of the short transmission time interval data can be transmitted and received by the length of the time interval, new and improved radio communication apparatus, communication method, it is possible to provide a computer program and a wireless communication system.
[0015]
　Incidentally, the above effect is not necessarily restrictive, with the above effects, or instead of the above effects, any effects shown herein, or other effects that may be grasped from the description, it may be achieved.
BRIEF DESCRIPTION OF THE DRAWINGS
[0016]
[1] is an explanatory diagram showing a LTE frame format.
FIG. 2 is an explanatory diagram showing a format of an LTE downlink.
3 is an explanatory diagram showing an overview of the scheduling of the LTE uplink.
It is an explanatory view showing a configuration example of a system according to the embodiment of FIG. 4 present disclosure.
5 is a block diagram showing an example of a configuration of a base station 100 according to the embodiment.
6 is a block diagram showing an example of a configuration of a terminal apparatus 200 according to the embodiment.
Is an explanatory view showing an example of FIG. 7] Short TTI region.
Is an explanatory view showing an example of FIG. 8] Short TTI region.
Is an explanatory view showing an example of FIG. 9] Short TTI region.
Is an explanatory view showing an example of FIG. 10] Short TTI region.
11 is a flowchart illustrating an exemplary operation of a base station 100 and the terminal device 200 according to the embodiment.
[12] The base station 100 is an explanatory diagram for explaining a method of notifying whether the information for a specific terminal unit no or is in the Short TTI region.
[13] The base station 100 is an explanatory diagram for explaining a method of notifying whether the information for a specific terminal unit no or is in the Short TTI region.
[14] illustrates the base station 100 is showing an example of notifying a or no information of the particular terminal device for using the DCI which is in the terminal device 200-specific search space of the PDCCH is in a Short TTI region it is.
[15] The base station 100 is an explanatory diagram showing how to notify the location of Short TTI data in the Short TTI area DCI.
[16] The base station 100 is an explanatory diagram showing how to notify the location of Short TTI data in the Short TTI area DCI.
17 is a flowchart illustrating an exemplary operation of a base station 100 and the terminal device 200 according to the embodiment.
[Figure 18] 1 OFDM is an explanatory diagram showing a Short TTI composed of symbols.
[Figure 19] 2 OFDM is an explanatory diagram showing a Short TTI composed of symbols.
FIG. 20 is a flowchart illustrating an exemplary operation of a base station 100 and the terminal device 200 according to the embodiment.
FIG. 21 is an explanatory diagram showing an example of Short TTI region in one subframe.
[Figure 22] 4 OFDM is an explanatory diagram showing a Short TTI composed of symbols.
[23] in one frame is an explanatory diagram showing a Short TTI composed 4OFDM symbol.
FIG. 24 is a flowchart illustrating an exemplary operation of a base station 100 and the terminal device 200 according to the embodiment.
[25] One subframe of a plurality of levels Short TTI is an explanatory diagram showing an example of a mix.
It is an explanatory diagram showing another arrangement example of FIG. 26] Short TTI.
Is an explanatory view showing an arrangement example of FIG. 27] Short TTI.
Is an explanatory view showing an arrangement example of FIG. 28] Short TTI.
Is an explanatory view showing an arrangement example of FIG. 29] Short TTI.
Is an explanatory view showing an arrangement example of FIG. 30] Short TTI.
FIG. 31 is a flowchart illustrating an exemplary operation of a base station 100 and the terminal device 200 according to the embodiment.
[FIG. 32] is an explanatory view showing an arrangement example of Short TTI.
[FIG 33 is an explanatory view showing an arrangement example of Short TTI.
Is an explanatory view showing an arrangement example of FIG. 34] Short TTI.
Is an explanatory view showing an example of a map displayed on FIG. 35 terminal of each user to perform a network game apparatus 200.
[FIG. 36] is an explanatory diagram showing that a single sub-frame is the first slot of the RBG and second slot of RBG.
Is an explanatory view showing an allocation example of the FIG. 37] Short TTI of the terminal device 200.
Is a diagram showing a state in which scheduling and normal TTI and Short TTI in FIG. 38 one terminal device 200
[39] is a flowchart illustrating an exemplary operation of a base station 100 and the terminal device 200 according to the embodiment.
[Figure 40] 11OFDM of symbols is an explanatory diagram showing that it contains the Short TTI data only at the beginning of the two OFDM symbols.
Is an explanatory view showing an example in FIG. 41 where three terminal device 200 decodes the data of the Short TTI respectively.
[FIG. 42] is an explanatory diagram terminal apparatus 200 to be described to decode all eleven Short TTI.
[Figure 43] and Short of TTI destination is an explanatory diagram showing an example of a result of CRC check at a certain terminal device 200.
[Figure 44] The base station 100 is an explanatory diagram showing information to be transmitted to the terminal apparatus 200.
[FIG. 45] is a flowchart illustrating an exemplary operation of a base station 100 and the terminal device 200 according to the embodiment.
[FIG. 46] is a block diagram showing an example of a configuration of a terminal apparatus 200 according to the embodiment.
Is an explanatory view showing an example of FIG. 47] Short TTI region.
Is an explanatory view showing an example of FIG. 48] Short TTI region.
Is an explanatory view showing an example of FIG. 49] Short TTI region.
DESCRIPTION OF THE INVENTION
[0017]
　Reference will now be described in detail preferred embodiments of the present disclosure. In the specification and the drawings, components having substantially the same function and structure are a repeated explanation thereof by referring to the figures.
[0018]
　The description will be made in the following order.
　1. The embodiment of the present disclosure
　　1.1. Overview
　　1.2. System Configuration
　　1.3. Functional configuration example
　　1.4. Operation Example
　　　1.4.1. The first example of the operation
　　　1.4.2. The second example of the operation
　　　1.4.3. Third operation example
　　　1.4.4. Summary of Operation Example
　2. Applications
　　2.1. Application example of a base station
　　2.2. Application example of terminal device
　4. Summary
[0019]
　<1. Embodiments of the present
　disclosure> [1.1. Summary
　In describing in detail exemplary embodiments of the present disclosure, first the outline of the embodiment of the present disclosure. After an overview of embodiments of the present disclosure will be described in detail embodiments of the present disclosure.
[0020]
　Figure 1 is an explanatory diagram showing a LTE frame format. As shown in FIG. 1, 1 radio frame of LTE is composed of 10 subframes (Sub Frame). The length of one subframe is 1 ms. Further, one sub-frame 14 of the OFDM; is composed of (orthogonal frequency-division multiplexing orthogonal frequency-division multiplexing) symbols. Band width is, for example, 20MHz.
[0021]
　Data transmitted from the In LTE, the base station (eNodeB) constitutes a single transport block in one subframe. Also at the end of the transport block has been attached CRC (Cyclic Redundancy Check). In other words, the terminal apparatus that receives data transmitted from the base station (UE; User Equipment) will allow decoding of the data by receiving the data of one subframe. In other words, UE is the success or failure of reception of the transport block may be determined by the implementation of the CRC. Therefore, UE is said to Hybrid ARQ (Auto Repeat Request), ACK or NACK for requesting retransmission, performed on the data in one subframe. ACK is to reply to eNodeB from UE upon successful reception of data, NACK is to reply to eNodeB from UE upon successful reception of the data.
[0022]
　Figure 2 is an explanatory diagram showing a format of an LTE downlink. In LTE, a plurality of resource blocks are present in one subframe. eNodeB can be assigned to data for each UE in the resource block units. eNodeB stores the control information for assigning data to each UE on a resource block basis, as PDCCH (Physical Downlink Control Channel), the control region arranged at the beginning of the subframe. PDCCH is present only one single sub-frame.
[0023]
　In LTE, in order to achieve a high data rate reduction, TTI is a 1 ms. That, TTI is the same as the time of one subframe. Processing delays in the UE to decode the transport blocks in one subframe take about 4 subframes. Therefore, UE, after 4 subframes of subframes received, it is possible to return the ACK or NACK to the eNodeB. Figure 3 is an explanatory diagram showing an overview of the scheduling of the LTE uplink. The PDCCH subframe the UE has received, but the scheduling information of the uplink is included, the scheduling information is made possible scheduling after 4 subframes of subframes received. The scheduling after 4 subframes of subframes received in this way has become possible because considering the processing delay in the UE.
[0024]
　Thus, the shorter TTI is delay and for decoding the UE, to shorten the time until the feedback to the eNodeB by using the uplink can be expected. More specifically, the shorter TTI is expected the following advantages.
[0025]
　The shorter TTI is the first, it is possible to control the low-latency applications running on UE. The shorter TTI is also becomes shorter decoding time at the UE, UE is short TTI (Short TTI, short transmission time interval) time required for decision making based on the data sent from the eNodeB in can be shortened. In the following description, to distinguish them from Short TTI, it may be referred to as Normal TTI that existing TTI. Thus, the shorter TTI is, UE will be able to carry out with low delay some control. For example, the UE, when moving some applications demanding the delay because, for example, real-time is strongly demanded, the decoding time is shortened is extremely great advantage. In the case of an object such as a UE, for example, automobiles and drones (autonomous flight flying body) is also because the real-time property is strongly required, the TTI is shortened becomes a very large benefit.
[0026]
　The shorter TTI is Secondly, it is possible to reduce the Hybrid ARQ of RTT. That, UE is shorter the decoding time, it becomes possible to more quickly determine the success or failure of reception of data. The UE, when it faster determine the success or failure of reception of data, allow the fast response ACK or NACK to the eNodeB. Therefore, the shorter TTI is, eNodeB after it sends the data to the UE, can shorten the time until the retransmission of the data can not be received at UE, also leads to improved throughput. In LTE of Hybrid ARQ, since the UE unless successfully received data can not be sent the next data, also send faster ACK from the UE to the eNodeB, which contributes to the improvement of throughput.
[0027]
　The shorter TTI is the third, it is possible to reduce the delay of the feedback CQI (Channel Quality Indicator). The UE measures the quality of the downlink channel based on Reference Signal provided by the eNodeB, reported the measurement results of the quality to eNodeB. The eNodeB, taking into account the quality of the downlink channel reported from UE, and determines the modulation scheme of the downlink data for the UE. A large delay feedback from UE, eNodeB may thus send data to the UE the modulation method corresponding to the quality and different quality of the original downlink. Thus, a delay of the measurement of the quality of the downlink channel, if reducing the delay measurement report, eNodeB can reduce the time to select an appropriate modulation scheme for the UE. If reducing the time to select an appropriate modulation scheme, improvement of the throughput of the downlink expected.
[0028]
　By transmitting the data in a short transmission time interval shorter than the existing transmission time interval, expected effects as described above. However, the effect comes into terminal device can only send and receive data on existing transmission time interval and replace all the transmission and reception of data existing transmission time short short transmission time interval than the interval. Therefore, it is necessary to mix the transmission and reception of data transmitted and received and a short transmission time interval of data in the existing transmission time interval.
[0029]
　Here, the case of mixing the transmission and reception of data in a short transmission time interval to transmit and receive data on existing transmission time interval, the terminal device which supports the transmission and reception of data in a short transmission time interval is an efficient reception process possible technology is required in order to to.
[0030]
　The introduction of Short TTI, can not be used once the circuitry required on the receiving side decoding. After receiving and decoding certain data, if time allowance until receiving and decoding the next data, can be calculated using a single multiplier, if there is no spare time, multiplier insufficient in one must prepare a plurality of multipliers. Therefore in order to realize the Short TTI, computational cost is up the receiver, there is a case where the hardware scale increases. UE leading to the eNodeB, may be provided from a variety of manufacturers. Depending on the manufacturer, to some places you want to keep reducing the hardware scale, there is also a place which is skilled in technology to reduce the hardware scale. All UE not known it can correspond to the length of the same Short TTI. In the following description, it may use the term "level" as a term to mean the difference between the length of the Short TTI. Therefore, the eNodeB side are prepared to Short TTI of different levels lead to the spread of the terminal corresponding to the Short TTI.
[0031]
　Moreover, even the UE corresponding to the Short TTI, the first place, all the UE does not know whether seeking low latency as well. Required delay time depends on the level of the application to be installed in UE. Therefore, to provide a Short TTI composed 1OFDM symbols to the UE not seeking so low delay leads to occupation of wasted resources.
[0032]
　Accordingly, the present disclosure shall, in view of the above points, corresponding to the transmission and reception of data in the case, the short transmission time interval to mix transmission and reception of data in a short transmission time interval to transmit and receive data on existing transmission time interval efficient reception processing in the terminal device has performed extensive studies on promising technologies. As a result, the present disclosure shall, as described below, the case of mixing the transmission and reception of data in a short transmission time interval to transmit and receive data on existing transmission time interval, where in a short transmission time interval of the resource by notifying a data exists from the base station, leading to devise efficient reception processing technique capable of the terminal device.
[0033]
　Above was an overview of embodiments of the present disclosure. Next, it will be described in detail embodiments of the present disclosure.
[0034]
　[1.2. System Configuration Example]
　FIG. 4 is an explanatory diagram showing a configuration example of a system according to an embodiment of the present disclosure. Hereinafter, an example of the configuration of a system will be described according to an embodiment of the present disclosure with reference to FIG.
[0035]
　Referring to FIG. 4, the system 1 includes a base station 100 and the terminal device 200. Here, the base station 100 is also referred to as eNodeB. Here also, the terminal apparatus 200 is also referred to as a user. The user may also be referred to as user equipment (UE). Here the UE can be a UE that is defined in the LTE or LTE-A, it may mean more generally communication equipment.
[0036]
　(1) the base station 100
　the base station 100 is a base station of a cellular system (or mobile communication systems). Base station 100, the terminal device (e.g., terminal 200) located in the cell 10 of the base station 100 performs radio communication with. For example, the base station 100 transmits downlink signals to the terminal device, receives uplink signals from the terminal device.
[0037]
　(2) the terminal device 200
　the terminal device 200 can communicate in a cellular system (or mobile communication systems). Terminal device 200 performs wireless communication with a base station of a cellular system (e.g., base station 100). For example, the terminal device 200 receives the downlink signal from the base station, transmits an uplink signal to the base station. Figure 4 illustrates a four terminal devices 200A ~ 200D. In the following description, if there is no particular need to distinguish between the terminal device 200
[0038]
　[1.3. Functional Configuration Example]
　Next, with reference to FIGS. 5 and 6, illustrating a functional configuration example of the base station 100 and the terminal device 200 according to an embodiment of the present disclosure.
[0039]
　First, referring to FIG. 5, an example of a configuration of base station 100 according to an embodiment of the present disclosure. Figure 5 is a block diagram showing an example of a configuration of a base station 100 according to the embodiment of the present disclosure. Referring to FIG. 5, the base station 100 includes an antenna unit 110, the wireless communication unit 120, a network communication unit 130, storage unit 140 and the processing unit 150.
[0040]
　(1) Antenna unit 110
　antenna unit 110 radiates into the space a signal output by the radio communication unit 120 as a radio wave. The antenna unit 110 converts the radio waves of space signal, and outputs the signal to the radio communication unit 120.
[0041]
　(2) wireless communication unit 120
　radio communication unit 120 transmits and receives signals. For example, wireless communication unit 120 transmits a downlink signal to the terminal device, it receives uplink signals from the terminal device.
[0042]
　(3) Network communication unit 130
　network communication unit 130 sends and receives information. For example, the network communication unit 130 transmits information to other nodes, to receive information from other nodes. For example, the other nodes, including other base stations and a core network node.
[0043]
　(4) storage unit 140
　storage unit 140 temporarily or permanently storing a program and various data for the operation of the base station 100.
[0044]
　(5) processing unit 150
　processing unit 150 provides various functions of the base station 100. Processing unit 150 includes a transmission processing unit 151 and notification unit 153. The processing unit 150 may further include other components other than these components. That is, processor 150 may perform also the operation other than the operation of these components.
[0045]
　The transmission processing unit 151 performs processing relating to transmission of the data directed to the terminal device 200. For example, the transmission processing unit 151 generates a frame composed of a plurality of sub-frames, the generated frame to execute a process of transmitting to the terminal apparatus 200. The notification unit 153 performs processing relating to the notification of information to the terminal apparatus 200. The specific operation of the transmission processing unit 151 and notification unit 153 will be described in detail later.
[0046]
　Next, referring to FIG. 6, an example of a configuration of a terminal apparatus 200 according to an embodiment of the present disclosure. Figure 6 is a block diagram showing an example of a configuration of a terminal apparatus 200 according to an embodiment of the present disclosure. Referring to FIG. 6, the terminal device 200 includes an antenna unit 210, radio communication unit 220, storage unit 230 and the processing unit 240.
[0047]
　(1) Antenna unit 210
　antenna unit 210 radiates into the space a signal output by the radio communication unit 220 as a radio wave. The antenna unit 210 converts the radio waves of space signal, and outputs the signal to the wireless communication unit 220.
[0048]
　(2) wireless communication unit 220
　radio communication unit 220 transmits and receives signals. For example, wireless communication unit 220 receives the downlink signal from the base station, transmits an uplink signal to the base station.
[0049]
　(3) storage unit 230
　storage unit 230 temporarily or permanently storing a program and various data for the operation of the terminal apparatus 200.
[0050]
　(4) processing unit 240
　processing unit 240 provides various functions of the terminal apparatus 200. Processing unit 240 includes an acquisition unit 241, reception processing unit 243 and notification unit 245. The processing unit 240 may further include other components other than these components. That is, the processing unit 240 may perform also the operation other than the operation of these components.
[0051]
　Acquisition unit 241 performs processing related to obtaining data transmitted from the base station 100. Reception processing unit 243 performs processing relating to reception of data acquisition unit 241 has acquired. Notification unit 245 performs processing relating to the notification of information to the base station 100. The operation of the acquisition unit 241, reception processing unit 243 and notification unit 245 will be described in detail later.
[0052]
　Above with reference to FIGS. 5 and 6, has been described a functional configuration example of the base station 100 and the terminal device 200 according to an embodiment of the present disclosure. Next, an operation example of the base station 100 and the terminal device 200 according to an embodiment of the present disclosure.
[0053]
　[1.4. Operation
　　Example (1.4.1. The first operation example)
　First, a first operation example of the base station 100 and the terminal device 200 according to an embodiment of the present disclosure. As described above, in the case of mixing the reception of data in a short transmission time interval to transmit and receive data on existing transmission time interval, the terminal device which supports the transmission and reception of data in a short transmission time interval efficient processing It becomes necessary technology to enable. In the first operation example, the terminal device which supports the transmission and reception of data in a short transmission time interval will be described an operation example for enabling efficient processing.
[0054]
　When mixing the transmitted and received data in Short TTI to send and receive data in an existing TTI, the base station 100 needs to inform the resources used in transmission and reception of data Short TTI where to find the terminal device 200 . Location of the resource used in the transmission and reception of data Short TTI has a way to tell the quasi-static, the method of dynamically informing is considered. Semi-statically, a method of notifying a resource for each terminal device 200, for allocating downlink resources for one terminal apparatus 200 semi-statically fixed, the use of transmission and reception of data Short TTI downlink resource is wasted if it does not. On the other hand, dynamically, a method of notifying a resource for each terminal device 200, along with control information increases the terminal apparatus 200 is to be observed, a control area terminal device 200 located in the cell 10 is increased (PDCCH) is no longer enough.
[0055]
　Therefore, the base station 100, when allocating resources for Short TTI, (1) Short method area for transmitting and receiving data in a TTI (Short TTI area) notifies the where it is, in (2) Short TTI region there, a method of notifying whether the or not there information for specific terminals, can take (3) a method of notifying a Short TTI resources for each terminal device, three methods. Incidentally, the three methods are all not necessarily essential for the base station 100. In the following, the details of the three methods.
[0056]
　(1) Short method TTI region informs where it is
　first described how to notify whether Short TTI region where to find. Base station 100, for example, system information using broadcast or, by using a dedicated Signal for each terminal device 200, and notifies the Short TTI regions in semi-statically one subframe to the terminal device 200. Means that where "the semi-statically (Semi-Static)" is Short TTI area does not change to the base station 100 to re-specify the Short TTI region, Short TTI region is changeable (changeable) to. Incidentally, Short TTI region in one subframe may have a plurality of present.
[0057]
　The base station 100 is to notify the Short TTI regions in semi-statically one subframe to the terminal device 200, it does not notify until either use the Short TTI region at this point how the respective terminal devices 200 .
[0058]
　Figure 7 is an explanatory diagram showing an example of Short TTI region. Code 301 of FIG. 7, points of one sub-frame, a Short TTI area designated in PDSCH (Physical Downlink Shared Channel). Shown in FIG. 7 is an example of a TTI in the region of a portion of the frequency bandwidth of 20MHz and the same length as the 1OFDM symbol.
[0059]
　As described above, Short TTI region in one subframe may have a plurality of present. Figure 8 is an explanatory diagram showing an example of Short TTI region. It is shown in FIG. 8, an example in which Short TTI region in one subframe are present two. Reference numeral 301 and 302, one sub-frame refers to a Short TTI area specified in PDSCH. Short TTI area indicated by reference numeral 301 is throughout the PDSCH, Short TTI area indicated by reference numeral 302 is over the second half of 7OFDM symbols of PDSCH. Also shown in Figure 8, Resource Short TTI area indicated by reference numeral 302 is an example of Short has more than TTI region of resources indicated by reference numeral 301.
[0060]
　Also, may be present Short TTI region across all of the sub-frame, there may be Short TTI regions in the specific sub-frame in one frame. Some applications require Short TTI region across all of the sub-frame, since some applications it is sufficient if it exists Short TTI regions in the specific sub-frame in one frame.
[0061]
　For example, the base station 100, but transmits a control signal to the terminal device 200 at a particular location in a frame, the use cases to expect us to decode the control signal in a short time the terminal device 200 Conceivable. This use case, the base station 100, a Short TTI region, a use case as used as an area for sending control signals of the terminal device 200. Control signal terminal 200 to the base station 100 transmits on Short TTI region may be a signal for the control of the application may be a control signal for the reception of radio signals.
[0062]
　As described above, although Short TTI region across all of the sub-frame may be present, it may be present Short TTI regions in the specific sub-frame in one frame. The base station 100 may change the Short TTI area for each sub-frame. The base station 100 can improve the degree of freedom by changing the Short TTI area for each sub-frame.
[0063]
　Figure 9 is an explanatory diagram showing an example of Short TTI region. Shown in Figure 9, a Short TTI region indicated by reference numeral 302 may be set base station 100 in advance, whether actually Short TTI data enters the area, the base station 100, at reference numeral 303 it is an example of a case of dynamically setting at the indicated DCI in PDCCH (Downlink Control Information).
[0064]
　Base station 100, in DCI in PDCCH indicated by reference numeral 303, by setting whether the data in the Short TTI area exists, preventing resource waste due to the Short TTI regions are always placed in a fixed it can be. That is, the base station 100 also sets the Short TTI region, since not necessarily always sent in a data Short TTI in Short TTI region, in DCI in the PDCCH, the data is present in the Short TTI region Sets whether or not it possible to prevent the waste of resources.
[0065]
　Figure 10 is an explanatory diagram showing an example of Short TTI region. FIG Shown in 10, similarly to FIG. 9, the Short TTI region indicated by reference numeral 302 may be set base station 100 in advance, whether actually Short TTI data enters the area, the base station 100 is an example of a case of dynamically setting in DCI in PDCCH indicated by reference numeral 303.
[0066]
　Example shown in FIG. 10 differs from the example shown in FIG. 9, what is set in DCI in PDCCH indicated by reference numeral 303, rather than the same sub-frame, subsequent different subframes in that a presence or absence of data in the Short TTI region. In the example shown in FIG. 9, that are set in DCI in PDCCH, because it is the presence or absence of data in the Short TTI region of the same subframe, the terminal device 200 decodes the PDCCH, the same presence or absence of data in the Short TTI region of the sub-frame must be immediately judged. In the example shown in FIG. 10, that are set in DCI in PDCCH, because it is the presence or absence of data in the Short TTI region subsequent another sub-frame, the terminal device 200, subsequent different sub at the time when the Short TTI region of the frame has arrived already known whether there is data Short TTI in that area. Thus, in the example shown in FIG. 10, the terminal device 200, when the Short TTI region of a subsequent separate subframe has arrived, it is possible to immediately start decoding if any Short TTI data.
[0067]
　Figure 11 is a flow diagram illustrating an exemplary operation of a base station 100 and the terminal device 200 according to an embodiment of the present disclosure. Shown in FIG. 11, an area where the base station 100 that may be used as a Short TTI notifies the terminal apparatus 200, the notification areas to notify the terminal device 200 to be used as a Short TTI an operation example of the base station 100 when. Hereinafter, an operation example of the base station 100 and the terminal device 200 according to an embodiment of the present disclosure with reference to FIG. 11.
[0068]
　The base station 100 notifies the Short TTI region in a subframe (regions that could become Short TTI) to the terminal device 200 (step S101). Processing in step S101, for example, the notification unit 153 executes. Base station 100, system information using broadcast or, by using a dedicated Signal for each terminal device 200, and notifies the area that may be used as a Short TTI in semi-statically one subframe.
[0069]
　Base station 100 notifies the area could become Short TTI to the terminal apparatus 200, followed by each sub-frame, that area could become Short TTI is actually used as a Short TTI dynamically notified (step S102). Processing in step S102, for example, the notification unit 153 executes. Base station 100, for example, in the DCI in the PDCCH as described above, to specify whether the area that may be used as a Short TTI is actually used as a Short TTI.
[0070]
　Base station 100, by operating in this manner, the base station 100 may use the resources efficiently, the terminal device 200 used as an area actually Short TTI that may become Short TTI reception processing it is sufficient to perform the operation for Short TTI if it is can streamline.
[0071]
　(2) Short in TTI region, a method for notifying whether the or not there information for specific terminals
　or Next, in Short TTI region, the information for a specific terminal unit, in its Short TTI region It describes a method for notification or not. For example, the base station 100, for each terminal device 200, to dynamically notify whether there is information addressed to the terminal device 200 to Short TTI area notified in quasi-static manner. Base station 100, for example, semi-statically by using dedicated signaling, or dynamically using the PDCCH, and notifies whether or not there is information addressed to the terminal device 200 to Short TTI region. The base station 100, if semi-statically notifications using dedicated signaling, without changes to the existing DCI, to notify whether there is information addressed to the terminal device 200 to Short TTI region It can be. The base station 100, if dynamically notifications using PDCCH, since it is you put the data in Short TTI only Short TTI area when transmitting data of Short TTI, the use of resources efficiently It can be.
[0072]
　At that time, the base station 100 notifies only whether there is information destined for the Short TTI region the terminal apparatus 200. The Short TTI area, whether there is data relating taking each of the terminal devices 200, it is desirable to be able to determine in time the terminal apparatus 200 is small. Short TTI region data is not the terminal device 200 is because it is not necessary to decode the data of the Short TTI, it is possible to reduce power consumption.
[0073]
　12, the base station 100 is an explanatory diagram for explaining a method of notifying whether the information for a specific terminal unit no or is in the Short TTI region. Shown in FIG. 12, in the PDCCH subframe, a state in which the information for a particular terminal device is notified whether or no is in the Short TTI area in the same subframe.
[0074]
　13, the base station 100 is an explanatory diagram for explaining a method of notifying whether the information for a specific terminal unit no or is in the Short TTI region. Shown in FIG. 13, the base station 100, the PDCCH subframe, a manner of notifying whether information for a particular terminal device is not or is in the Short TTI region within the subsequent subframe.
[0075]
　Method shown in Figure 13, albeit in a manner similar to the method shown in FIG. 12, the base station 100, the PDCCH subframe, information for a particular terminal device Short TTI in subsequent subframe by notifying a free or is in the area, it is possible to advance the Short start timing of the decoding of the data of the TTI of the terminal device 200.
[0076]
　The base station 100 is designated when notifying whether the information for a specific terminal unit no or is in the Short TTI region, using the DCI which is in the terminal device 200-specific search space of the PDCCH (or ePDCCH) it may be. Figure 14 is an explanatory diagram showing an example in which the base station 100 notifies the absence or information of a specific terminal device for using the DCI which is in the terminal device 200-specific search space of the PDCCH is in a Short TTI region it is.
[0077]
　The base station 100, if dynamically notifications using PDCCH, since it is you put the data in Short TTI only Short TTI area when transmitting data of Short TTI, be efficient use of resources can. The terminal device 200, the Short TTI area, whether there is data relating taking each of the terminal device 200, can determine with little effort. Furthermore, Short TTI region data is not the terminal device 200 is because it is not necessary to decode the data of the Short TTI, it is possible to reduce power consumption.
[0078]
　(3) a method for notifying a Short TTI of resource for each terminal
　base station 100, whether there is Short TTI of data Short TTI region may be notified by DCI, but the time of the notification, the Short which resources TTI region receives the terminal apparatus 200 of the subject may be notified be the data of Short TTI to be decoded.
[0079]
　15, the base station 100 is an explanatory diagram showing how to notify the location of Short TTI data in the Short TTI area DCI. In the example shown in FIG. 15, the location indicated by reference numeral 305 in the same subframe, and receives the terminal device 200 of interest is where the data is the Short TTI to be decoded. The base station 100, that there is a Short TTI of data to be decoded in the location indicated by reference numeral 305, notified by DCI to the terminal device 200 of interest. By notifying in this way, the terminal apparatus 200 which has received the DCI can be decoded with reference to only that location.
[0080]
　16, the base station 100 is an explanatory diagram showing how to notify the location of Short TTI data in the Short TTI area DCI. In the example shown in FIG. 16, the location indicated by reference numeral 305 in a subsequent subframe, and receives the terminal device 200 of interest is where the data is the Short TTI to be decoded. The base station 100, that there is a Short TTI of data to be decoded in the location indicated by reference numeral 305, notified by DCI to the terminal device 200 of interest. By notifying in this way, the terminal apparatus 200 which has received the DCI can be decoded with reference to only that location.
[0081]
　The base station 100, rather than PDCCH, in ePDCCH containing the control signals to the portion of the PDSCH, may notify the information about the Short TTI. When notifying in ePDCCH, the base station 100 may notify the information about the Short TTI in the same sub-frame, may notify the information on Short TTI in the subsequent subframe.
[0082]
　Figure 17 is a flow diagram illustrating an exemplary operation of a base station 100 and the terminal device 200 according to an embodiment of the present disclosure. Shown in FIG. 17, the area where the base station 100 that may be used as a Short TTI after notification to the terminal device 200, to the terminal device 200 returns an ACK or NACK for the received data, it is an operation of a base station 100 and the terminal device 200. Hereinafter, an operation example of the base station 100 and the terminal device 200 according to an embodiment of the present disclosure with reference to FIG. 17.
[0083]
　The base station 100 notifies the Short TTI region in a subframe (regions that could become Short TTI) to the terminal device 200 (step S101). Processing in step S101, for example, the notification unit 153 executes. Base station 100, system information using broadcast or, by using a dedicated Signal for each terminal device 200, and notifies the area that may be used as a Short TTI in semi-statically one subframe.
[0084]
　Base station 100 notifies the area could become Short TTI to the terminal apparatus 200, followed by each sub-frame, that area could become Short TTI is actually used as a Short TTI dynamically notified (step S102). Processing in step S102, for example, the notification unit 153 executes. Base station 100, for example, in the DCI in the PDCCH as described above, to specify whether the area that may be used as a Short TTI is actually used as a Short TTI.
[0085]
　Then base station 100 is in the Short TTI, and notifies the presence or absence of resources for a particular terminal device 200 to the terminal device 200 (step S103). Processing in step S103, for example, the notification unit 153 executes.
[0086]
　Then base station 100 is in the Short TTI, the location of the resource to be received specific terminal device 200 notifies the terminal apparatus 200 (step S104). Processing in step S104, for example, the notification unit 153 executes.
[0087]
　Then the base station 100 transmits to the terminal apparatus 200 to put the data of Short TTI to the location of the resource notified by the step S104 (step S105). Processing in step S105, for example, the transmission processing unit 151 executes by sending data through the antenna unit 110 from the wireless communication unit 120.
[0088]
　Terminal device 200, based on the information reported from the base station 100 in step S101 ~ S104, decodes the Short TTI of data transmitted from the base station 100 in step S105 (step S106). Processing in step S106, for example the reception processing unit 243 performs.
[0089]
　Terminal device 200, when decoding the data of the Short TTI in step S106, the base station 100, the ACK A successful decode, a NACK if it fails, and notifies each (step S107). Processing in step S107, for example the notification unit 245 executes.
[0090]
　Conventional eNodeB had specified resources individually for each UE in DCI in the PDCCH. But Short TTI resources, unlike conventional TTI resources, a special. Since not its special Short TTI is always present, Short TTI region, it is desirable to somewhat variable. However, if not determined and the Short TTI region and normal TTI region, since can not specify the resources directly from the PDCCH, it is difficult to directly specify the Short TTI resources from PDCCH.
[0091]
　In the first operation example of this embodiment, therefore, the base station 100 is adapted to specify the semi-statically Short TTI region, dynamically specifies whether the Short TTI region is present. The base station 100 to the terminal device 200, whether there is a Short TTI data of the terminal device 200, and a dynamic method using PDCCH, and notifies in a quasi-static method using dedicated signaling . By notifying in this way, compared to the method specified all resources directly in conventional PDCCH, allowing efficient operation than traditional resources usually TTI, the resources both of the Short TTI.
[0092]
　Application first operation example of this embodiment is configured to specify the semi-statically Short TTI region, the Short that TTI area is dynamically specify whether there, it mounted on the terminal device 200 base station 100 is possible with low delay, and to good response control. The first operation example of this embodiment, since capable terminal device 200 returns faster ACK or NACK, improvement of throughput can be expected. The first operation example of this embodiment, since it is possible to efficiently mix Short TTI resources and resources existing TTI, without causing waste of resources, and improving the throughput can be greatly expected.
[0093]
　　(1.4.2. Second operation example)
　Next, a description will be given of a second operation example of the base station 100 and the terminal device 200 according to an embodiment of the present disclosure. As described above, in the case of mixing the reception of data in a short transmission time interval to transmit and receive data on existing transmission time interval, that the base station side are prepared to Short TTI various levels, Short TTI leading to the spread of the terminal device corresponding to. In the second operation example, an operation example of the base station 100 and the terminal device 200 at the time of preparing a Short TTI various levels.
[0094]
　Figure 18 is an explanatory diagram showing a Short TTI composed 1OFDM symbol. The Short TTI composed 1OFDM symbol is also referred to as Short TTI level 1. Further 19 is an explanatory diagram showing a Short TTI composed 2OFDM symbol. The Short TTI composed 2OFDM symbol is also referred to as Short TTI Level 2.
[0095]
　Short when the level of the TTI is 1, the overall throughput of LTE resource is uselessly occupied is reduced. The reason is that there is a case where all terminals 200 corresponding to the Short TTI does not require the level of similar Short TTI. Also, all the terminal devices 200 corresponding to the Short TTI is not necessarily the same as can be realized the level of Short TTI. Therefore, by telecom operators are prepared the levels of a plurality of Short TTI, the terminal device 200 corresponding to the Short TTI of different vendors (makers) can be produced, LTE network to provide the level of a plurality of Short TTI it is possible to connect to.
[0096]
　The base station 100 prepares a level of a plurality of Short TTI. Setting Short TTI levels may be different for each cell. Base station 100, the levels of a plurality of Short TTI to provide the base station 100, a broadcast, previously notifies the terminal apparatus 200, for example, system information.
[0097]
　Terminal device 200, the processing capacity (for example, hardware capabilities, and applications of the category to be executed, capabilities of the device itself) is notified to the base station 100. The terminal device 200 may set the delay level that requires each application to run. Even the ability to process with low delay to the terminal device 200, in some applications where the terminal device 200 executes is because there may not seek low delay.
[0098]
　Terminal device 200 may be a state Short TTI multiple levels are mixed within the same sub-frame may process data for the multiple levels of Short TTI. The terminal device 200, and a normal TTI data and Short TTI data may be processed in parallel.
[0099]
　Figure 20 is a flow diagram illustrating an exemplary operation of a base station 100 and the terminal device 200 according to an embodiment of the present disclosure. Hereinafter, an operational example of the base station 100 and the terminal device 200 according to an embodiment of the present disclosure will be described with reference to FIG. 20.
[0100]
　Base station 100, the level of which can be provided Short TTI, it provides a broadcast to the terminal apparatus 200 located in the cell (step S201). Processing in step S201, for example the notification unit 153 executes.
[0101]
　Terminal device 200 base station 100 receives the level of which can be provided Short TTI from the base station 100 notifies a capability that can process the Short TTI to the base station 100 (step S202). Processing in step S202, for example the notification unit 245 executes. In this step S202, the terminal apparatus 200 may notify the information of the hardware processing power in the base station 100.
[0102]
　The terminal device 200 according to the application of the application that is running, require the level of Short TTI to the base station 100 (step S203). Processing in step S203, for example the notification unit 245 executes.
[0103]
　The base station 100 receives the request for the level of capabilities and Short TTI that can handle Short TTI from the terminal device 200, based on the content received, select the level of Short TTI, the terminal device 200, Short TTI use of resources, and transmits a Short TTI of data corresponding to the level selected (step S204). Processing in step S204, for example the transmission processing unit 151 executes by sending data through the antenna unit 110 from the wireless communication unit 120.
[0104]
　Base station 100 according to the embodiment of the present disclosure, by operating in this manner, it is possible to select the level of Short TTI in response to the capabilities and requirements of the terminal apparatus 200. The terminal apparatus 200 according to an embodiment of the present disclosure, this way, by notifying the ability and the own device, it is possible to receive data Short TTI at a level required by the application to be executed.
[0105]
　Some of the terminal device 200 also receives the data in a small Short TTI levels is also contemplated that some delay is acceptable even longer than that level. Figure 21 is an explanatory diagram showing an example of Short TTI region in one subframe. For example, a certain terminal device 200 also receives the data at the Short TTI level 1, the delay of 2OFDM symbol is acceptable. In that case, the base station 100, to the terminal device 200, is used as a Short TTI in 1OFDM symbol intervals as shown in FIG. 21. OFDM symbol indicated by reference numeral 311 is an OFDM symbol to be used as a Short TTI to the terminal apparatus 200. The base station 100 as is, Short the TTI region that is used in the terminal device 200 to 1OFDM symbol intervals, can be to provide resources to the terminal apparatus 200 which delays 2OFDM symbols acceptable efficiently.
[0106]
　Short TTI region shown in FIG. 21 is different from the Short TTI composed 2OFDM symbols shown in FIG. 19, it is thinned out the resources configured Short TTI in 1OFDM symbol. The base station 100 is able to use the thinned resource (OFDM symbols shown by reference numeral 312) to the other terminal devices 200. That is, the base station 100 would have lowered the level of the delay control by thinning the 1OFDM every other symbol resources composed Short TTI in 1OFDM symbol. The terminal device 200 that requests a delay of 1OFDM symbols may receive data Short TTI from the base station 100 in resources of any OFDM symbols of the code 311, 312 in FIG. 21.
[0107]
　Short TTI composed 2OFDM symbols as shown in FIG. 19, can be completed in one sub-frame. However, for example, Short TTI composed 4OFDM symbols, can not be completed in one sub-frame. Figure 22 is an explanatory diagram showing a Short TTI composed 4OFDM symbol. Short TTI Level 4 constituting the Short TTI in 4OFDM symbols, can not be completed in one sub-frame, as shown in FIG. 22, portions that span two frames occurs. In this case, the base station 100 notifies whether the Short TTI data spans two frames to the terminal device 200.
[0108]
　System frame number (System Frame Number; SFN) is repeated an integer from 0 to 1023. The sub-frame is present 10 in one frame. 23, in one frame, is an explanatory diagram showing a Short TTI composed 4OFDM symbol. If Short TTI is composed of 4OFDM symbol, as shown in FIG. 23, Short TTI is arranged constituted by 4OFDM symbols across the first subframe and the second subframe. That, Short TTI composed 4OFDM symbols across the odd-numbered subframe and the even-numbered subframe is located. Therefore, a system frame number and a subframe number, if notifying the relationship between the Short TTI phases from the base station 100 to the terminal device 200, the terminal device 200 can normally receive the Short TTI of 4OFDM symbol.
[0109]
　SFN from the base station 100 to the terminal apparatus 200, and is transmitted in a broadcast signal of MIB (Master Information Block). Accordingly, the base station 100 includes a system frame number and a subframe number, or fixed in advance the relationship between the Short TTI phase, and the system frame number and a subframe number, the relationship between the Short TTI phase signaling separately notified to the terminal device 200. Base station 100, 4 OFDM such as Short TTI symbols only if that can not be completed in one sub-frame, the system frame number and the subframe number may notify the relationship between Short TTI phase .
[0110]
　Figure 24 is a flow diagram illustrating an exemplary operation of a base station 100 and the terminal device 200 according to an embodiment of the present disclosure. Shown in FIG. 24, an exemplary operation of the base station 100 and the terminal device 200 when the Short TTI can not be completed in one sub-frame. Hereinafter, an operational example of the base station 100 and the terminal device 200 according to an embodiment of the present disclosure will be described with reference to FIG. 24.
[0111]
　Base station 100, MIB, etc., to provide a system frame number to the terminal device 200 in a broadcast (step S211). The process of step S211, for example notifying unit 153 executes.
[0112]
　Then the base station 100, the level of which can be provided Short TTI, it provides a broadcast to the terminal apparatus 200 located in the cell (step S212). Processing in step S212, for example the notification unit 153 executes.
[0113]
　Then the base station 100 includes a Short TTI of each level, the correspondence between the system frame number and the subframe number are provided in the broadcast or dedicated signaling to the terminal device 200 (step S213). Processing in step S213, for example the notification unit 153 executes. The correspondence relationship between the Short TTI for each level, a system frame number and the sub-frame number, may be fixed in advance specification.
[0114]
　Terminal device 200 base station 100 receives the level of which can be provided Short TTI from the base station 100 notifies a capability that can process the Short TTI to the base station 100 (step S214). Processing in step S214, for example the notification unit 245 executes.
[0115]
　The terminal device 200 according to the application of the application that is running, require the level of Short TTI to the base station 100 (step S215). Processing in step S215, for example the notification unit 245 executes.
[0116]
　The base station 100 receives the request for the level of capabilities and Short TTI that can handle Short TTI from the terminal device 200, based on the content received, select the level of Short TTI, the terminal device 200, Short TTI use of resources, and transmits a Short TTI of data corresponding to the level selected (step S216). Processing in step S216, for example the transmission processing unit 151 executes by sending data through the antenna unit 110 from the wireless communication unit 120.
[0117]
　Terminal device 200 receives the data of Short TTI from the base station 100, decodes the data of the Short TTI based on the correspondence received from the base station 100 in step S213.
[0118]
　Base station 100 according to the embodiment of the present disclosure, by operating in this manner, it is possible to select the level of Short TTI in response to the capabilities and requirements of the terminal device 200, normally the terminal device 200 Short it is possible to decode the TTI of data. The terminal apparatus 200 according to an embodiment of the present disclosure, by notifying in this way, capacity and of its own device, which receives the data of the Short TTI at a level required by the application to be executed, normally Short it is possible to decode a TTI of data.
[0119]
　Short TTI of multiple levels may be mixed in one subframe. Figure 25 is an explanatory view showing an example in which a plurality of levels of Short TTI in one subframe are mixed.
[0120]
　FIG 25, in one sub-frame, and Short TTI level 4 consisting 4OFDM symbol, Short and TTI level 2 consisting 2OFDM symbol, are shown examples are mixed. In the example of FIG. 25, the first subframe Short TTI level 2 after Short TTI of level 4 arranged three subsequently are arranged one first level 2 Short TTI to the next sub-frame There Short TTI level 4 after being placed one is arranged three subsequently. Of course, the arrangement pattern is not limited to such an example. Different levels of Short TTI in all subframes may be arranged in a mixed manner in the same pattern. For example, in all subframes, the level 2 Short TTI may be arranged one after Short TTI of level 4 arranged three subsequently. Further, for example, in all subframes, Short TTI level 4 may be arranged three subsequently after the beginning of the level 2 Short TTI is arranged one.
[0121]
　Figure 26 is an explanatory diagram showing another arrangement example of Short TTI. The sub-frame is typically the control signal to the head portion is arranged PDCCH that can be stored, the PDSCH that the user data can be stored is arranged after the PDCCH. For example, used in PDSCH the 3OFDM symbols as shown in FIG. 26, only the portion of the subsequent PDSCH considering that the Short TTI. In this case, when you try to use only Short TTI level 2, last 1OFDM symbol of a subframe can not be used as a Short TTI level 2. Therefore, as shown in FIG. 26, may be used last 1OFDM symbol of the subframe as Short TTI level 1. Incidentally, as shown in FIG. 26, the base station 100 may be used separately resource is an OFDM symbol in the Short TTI and Level 2 Short TTI level 1.
[0122]
　Figure 27 is an explanatory view showing an arrangement example of Short TTI. Arrangement of Short TTI shown in FIG. 27, Short differs from arrangement example of TTI shown in FIG. 26, in the last 1OFDM symbol of the subframe, the resources of the level 2 Short TTI is disposed Short TTI is the point that is not located.
[0123]
　As shown in FIG. 26 and FIG. 27, the base station 100 may be used separately resource is an OFDM symbol in the Short TTI and Level 2 Short TTI level 1 but is assigned to each Short TTI the amount of resources may be changed. 26 and 27, many cases as compared with the amount of resources that the amount of resources allocated to Short TTI level 2 assigns to Short TTI level 1 is shown. Base station 100, the amount of resources allocated to the Short TTI of each level, may be changed according to, for example, the demand from the terminal device 200.
[0124]
　As shown in FIG. 26 and FIG. 27, the portion of the PDCCH without placing Short TTI, when deploying Short TTI only a portion of the PDSCH, the length of the PDCCH is variable from 1OFDM symbols to 3OFDM symbols. Base station 100, information of the length of PDCCH (information of the number of OFDM symbols), can be notified to the terminal device 200 by PCFICH (Physical Control Format Indicator Channel), which is in the PDCCH. Since the length of the PDCCH is variable from 1OFDM symbols to 3OFDM symbols, the length of the PDSCH is variable from 11OFDM symbols to 13OFDM symbols. Accordingly, when arranging the Short TTI only a portion of the PDSCH, it is desirable to notify the relationship between the arrangement pattern of the variable a is PDSCH and Short TTI the terminal apparatus 200.
[0125]
　Figure 28 is an explanatory view showing an arrangement example of Short TTI. Shown in FIG. 28, length 3OFDM symbols PDCCH, i.e. the length of the PDSCH is located example of Short TTI in case of 11OFDM symbol. In the example shown in FIG. 28, it is used separately resources one OFDM symbol in the Short TTI of the level 2 Short TTI level 1.
[0126]
　Figure 29 is an explanatory view showing an arrangement example of Short TTI. Shown in FIG. 29, length 2OFDM symbols PDCCH, i.e. the length of the PDSCH is located example of Short TTI in case of 12OFDM symbol. Also in the example shown in FIG. 29, it is used separately resources one OFDM symbol in the Short TTI of the level 2 Short TTI level 1.
[0127]
　Figure 30 is an explanatory view showing an arrangement example of Short TTI. Shown in FIG. 30, length 1OFDM symbols PDCCH, i.e. the length of the PDSCH is located example of Short TTI in case of 13OFDM symbol. Also in the example shown in FIG. 30, it is used separately resources one OFDM symbol in the Short TTI of the level 2 Short TTI level 1.
[0128]
　If the arrangement pattern of the Short TTI varies according to the manner the length of PDCCH (i.e. the length of the PDSCH), the base station 100 notifies the relation between the arrangement pattern of the PDSCH and Short TTI in advance the terminal device 200 to keep. Then, the base station 100 notifies the information of the length of the PDCCH to the terminal device 200 by PCFICH. Terminal device 200, by knowing the information of the length of PDCCH, Short TTI is what arrangement pattern or the can know.
[0129]
　Figure 31 is a flowchart illustrating an exemplary operation of a base station 100 and the terminal device 200 according to an embodiment of the present disclosure. Hereinafter, an operational example of the base station 100 and the terminal device 200 according to an embodiment of the present disclosure will be described with reference to FIG. 31.
[0130]
　The base station 100 first corresponding to PCFICH, and notifies the arrangement pattern of Short TTI the terminal device 200 (step S221). Notification of step S221, for example the notification unit 153 executes. Corresponding to PCFICH, the arrangement pattern of the Short TTI may be fixed in advance specification.
[0131]
　Then the base station 100 notifies the information of the length of the PDCCH to the terminal device 200 in PCFICH (step S222). Notification of step S222, for example the notification unit 153 executes.
[0132]
　Then the base station 100, corresponding to the PCFICH, provide Short TTI (step S223). Processing in step S223, for example the transmission processing unit 151 executes by sending data through the antenna unit 110 from the wireless communication unit 120. For example, if the length of the PDCCH placement pattern Short TTI when the 3OFDM symbol is a pattern as shown in FIG. 28, the base station 100, Short in the arrangement pattern of such Short TTI as shown in FIG. 28 to provide a TTI.
[0133]
　Terminal device 200, corresponding to the PCFICH, know the arrangement pattern of Short TTI, when notified of the length of the information PDCCH in PCFICH, to determine the placement of the Short TTI in response to PCFICH, the data of Short TTI performing a decoding process (step S224). Processing in step S224, for example the reception processing unit 243 performs.

claims

A frame generator for generating a frame including a plurality of subframes,
　and a transmission unit transmitting the generated frame to the other communication apparatus,
　in the subframe, a short transmission time interval from one sub-frame period short transmission time interval, a notification unit for notifying information of a plurality of lengths,
comprising a wireless communication device.
[Requested item 2]
　Further comprising a processing unit for selecting one of a length from said plurality of lengths based on the information about the capabilities of the other communication device that is transmitted from the other communication device based on the plurality of lengths of the information, the wireless communication apparatus according to claim 1.
[Requested item 3]
　Wherein the processing unit transmits the data of the short transmission time interval using some resources in the short transmission time interval fields for transmitting data in a short transmission time interval, the wireless communication apparatus according to claim 2.
[Requested item 4]
　The notification unit notifies each the length of a short transmission time interval, the correspondence between the frame numbers and subframe numbers, the radio communication apparatus according to claim 1.
[Requested item 5]
　Wherein the processing unit including a data of a plurality of the length of the short transmission time interval to a single sub-frame, the radio communication apparatus according to claim 2.
[Requested item 6]
　Wherein the processing unit, including a data of a short transmission time interval destined plurality of other communication devices in one sub-frame, the radio communication apparatus according to claim 2.
[Requested item 7]
　Wherein the processing unit is configured to intermittently arrange the data of the short transmission time interval to a single sub-frame, the radio communication apparatus according to claim 2.
[Requested item 8]
　Wherein the processing unit, the short transmission to vary the length of the time interval region for transmitting data in a short transmission time interval according to the length of the control region of the subframe, the wireless communication apparatus according to claim 2.
[Requested item 9]
　The notification unit is configured to notify the correspondence between the short transmission time interval and the sub-frame number in the case extends over the short transmission time interval is two subframes, the radio communication apparatus according to claim 1.
[Requested item 10]
　The setting of the plurality of the length of the short transmission time interval is different for each cell, the wireless communication apparatus according to claim 1.
[Requested item 11]
　Which receives a frame consisting of a plurality of sub-frames, acquires the acquisition in the subframe, the short transmission time interval is shorter transmission time interval from one sub-frame period, the information of a plurality of length from another communication device It comprises a section, a wireless communications device.
[Requested item 12]
　Further comprising a notification unit for notifying the information about the capabilities of the local device based on the plurality of lengths of the information acquired by the acquiring unit to the other communication apparatus, a wireless communication apparatus according to claim 11.
[Requested item 13]
　The notification unit notifies the information about the software capabilities as the ability of the self device, the wireless communication apparatus according to claim 12.
[Requested item 14]
　The notification unit is configured to notify the information about the hardware capabilities as a capability of the apparatus, the wireless communication apparatus according to claim 12.
[Requested item 15]
　The acquisition unit, the length selected by the other communication apparatus, wherein the acquiring the data of a short transmission time interval from the other communication apparatus, a wireless communication apparatus according to claim 11.
[Requested item 16]
　Generating a frame including a plurality of sub-frames,
　and transmitting the generated frame to the other communication apparatus,
　within said sub-frame, a short transmission time interval is shorter transmission time interval from one sub-frame period of a notifying information of a plurality of lengths,
including, a wireless communication method.
[Requested item 17]
　Receiving a frame comprising a plurality of sub-frames,
　within said sub-frame, the short transmission time interval is shorter transmission time interval from one sub-frame period, and obtaining a plurality of length information from the base station ,
including, wireless communication method.
[Requested item 18]
　The computer,
　and generating a frame comprising a plurality of sub-frames,
　and transmitting the generated frame to the other communication apparatus,
　in the subframe, a short transmission time interval from one sub-frame period short transmission time interval, and to notify the information of a plurality of lengths,
to execute the computer program.
[Requested item 19]
　A computer,
　comprising: receiving a frame including a plurality of sub-frames,
　acquires within said subframe, short transmission time interval is shorter transmission time interval from one sub-frame period, a plurality of length information from the base station and that,
to the execution, the computer program.
[Requested item 20]
　Comprising a first communication apparatus and the second communication device,
　the first communication apparatus,
　a frame generator for generating a frame including a plurality of sub-frames,
　the generated frame to the second communication device a transmission unit that transmits,
　in the subframe, the short transmission time interval is shorter transmission time interval from one sub-frame period, a notification unit for notifying a plurality of length information to the second communication device,
the provided,
　the second communication device is configured to receive the frame, comprises an acquisition section that the said short transmission time interval in the sub-frame, to obtain a plurality of length information from said first communication device, wireless communication system.