WO2021215119A1

WO2021215119A1 - Terminal and communication method

Info

Publication number: WO2021215119A1
Application number: PCT/JP2021/008076
Authority: WO
Inventors: 翔平吉岡; 尚哉芝池; 聡永田
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2020-04-22
Filing date: 2021-03-03
Publication date: 2021-10-28
Also published as: JP2023082227A

Abstract

A terminal comprising: a reception unit which, upon failure to sense side link control information transmitted from another terminal at a specific timing in a sensing window, if there is another detection timing for the side link control information other than the specific timing in the sensing window, the other timing corresponding to a specific period among a plurality of periods, performs decoding of the side link control information at the other detection timing; a control unit which, if the reception unit has successfully decoded the side link control information at the other detection timing, performs elimination of a resource from a set of resources included in a resource selection window on the basis of the side link control information; and a transmission unit which performs transmission to the other terminal using, among the set of resources included in the resource selection window, a resource selected from the set of resources other than the resource eliminated by the control unit.

Description

Terminal and communication method

The present invention relates to a terminal and a communication method in a wireless communication system.

In LTE (Long Term Evolution) and LTE successor systems (for example, LTE-A (LTE Advanced), NR (New Radio) (also referred to as 5G)), D2D in which terminals communicate directly with each other without going through a base station. (Device to Device) technology is being studied (for example, Non-Patent Document 1).

D2D reduces the traffic between the terminal and the base station, and enables communication between the terminals even if the base station becomes unable to communicate due to a disaster or the like. In 3GPP (3rd Generation Partnership Project), D2D is referred to as "sidelink", but in the present specification, D2D, which is a more general term, is used. However, in the description of the embodiment described later, a side link is also used if necessary.

D2D communication includes D2D discovery (also called D2D discovery) for discovering other terminals that can communicate, and D2D communication (D2D direct communication, D2D communication, direct communication between terminals) for direct communication between terminals. It is also roughly divided into communication, etc.). Hereinafter, when D2D communication, D2D discovery, etc. are not particularly distinguished, they are simply referred to as D2D. Further, a signal transmitted / received in D2D is called a D2D signal. Various use cases of services related to V2X (Vehicle to Everything) in NR are being studied (for example, Non-Patent Document 2).

Resource allocation mode 2 is supported for direct terminal-to-terminal communication in NR-V2X. When the resource allocation mode 2 is applied, the terminal executes sensing and selects available resource candidates from the resource selection window based on the result.

In the case of periodic resource exclusion from resource candidates based on slots that the terminal did not monitor in the sensing window, there is a need for a way to allow the appropriate selection of resources to exclude. There is.

According to one aspect of the present invention, when the control information of the side link transmitted from another terminal cannot be sensed at a specific timing in the sensing window, the above-mentioned is performed in the sensing window in addition to the specific timing. If there is another detection timing corresponding to a specific cycle among the plurality of cycles, which is another detection timing of the side link control information, the decoding of the side link control information is performed at the other detection timing. When the receiving unit that performs the above and the receiving unit can decode the control information of the side link at the other detection timing, the resource is based on the control information of the side link from the set of resources included in the resource selection window. The control unit that excludes the information and the resource selected from the set of resources other than the resource excluded by the control unit from the set of resources included in the resource selection window are used to execute transmission to another terminal. A transmitter and a terminal having the transmitter are provided.

According to the embodiment, it is possible to appropriately select the resource to be excluded when periodically excluding the resource from the resource candidates based on the slot that the terminal did not monitor in the sensing window. A method is provided.

It is a figure for demonstrating V2X. It is a figure for demonstrating the example (1) of the transmission mode of V2X. It is a figure for demonstrating the example (2) of the transmission mode of V2X. It is a figure for demonstrating the example (3) of the transmission mode of V2X. It is a figure for demonstrating the example (4) of the transmission mode of V2X. It is a figure for demonstrating the example (5) of the transmission mode of V2X. It is a figure for demonstrating the example (1) of the communication type of V2X. It is a figure for demonstrating the example (2) of the communication type of V2X. It is a figure for demonstrating the example (3) of the communication type of V2X. It is a figure which shows the example of a transmission operation. It is a figure which shows the example which excludes a resource which a terminal can specify by SCI of another terminal. It is a figure which shows the example of the case where the terminal periodically excludes a resource based on the slot which was not monitored in the sensing window. It is a figure which shows the example of the case where only the head resource of a cycle is excluded. It is a figure which shows the operation example of A-1. It is a figure which shows the operation example of A-2. It is a figure which shows the operation example of A-3. It is a figure which shows the operation example of B-1. It is a figure which shows an example of the functional structure of a base station. It is a figure which shows an example of the functional structure of a terminal. It is a figure which shows an example of the hardware composition of a base station or a terminal.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments described below are merely examples, and the embodiments to which the present invention is applied are not limited to the following embodiments.

It is assumed that the wireless communication system in the following embodiment basically conforms to NR, but this is an example, and the wireless communication system in the present embodiment is a wireless communication system other than NR in a part or all of the wireless communication system. It may be compliant with a communication system (eg LTE, LTE-A).

Further, in the embodiment of the present invention, the duplex system may be a TDD (Time Division Duplex) system, an FDD (Frequency Division Duplex) system, or other system (for example, Flexible Duplex, etc.). Method may be used.

Further, in the embodiment of the present invention, "configuring" the radio parameter or the like may mean that a predetermined value is set in advance (Pre-configure), or the base station 10 or The radio parameter notified from the terminal 20 may be set.

FIG. 1 is a diagram for explaining V2X. In 3GPP, it is considered to realize V2X (Vehicle to Everything) or eV2X (enhanced V2X) by expanding the D2D function, and specifications are being promoted. As shown in FIG. 1, V2X is a part of ITS (Intelligent Transport Systems), V2V (Vehicle to Vehicle) which means a communication mode between vehicles, and a roadside installed between a vehicle and a roadside. V2I (Vehicle to Infrastructure), which means the communication mode between the machine (RSU: Road-Side Unit), V2N (Vehicle to Network), which means the communication mode between the vehicle and the ITS server, and , Is a general term for V2P (Vehicle to Pedestrian), which means a communication mode between a vehicle and a mobile terminal possessed by a pedestrian.

Also, in 3GPP, V2X using LTE or NR cellular communication and terminal-to-terminal communication is being studied. V2X using cellular communication is also referred to as cellular V2X. In NR V2X, studies are underway to realize large capacity, low delay, high reliability, and QoS (Quality of Service) control.

Regarding LTE or NR V2X, it is expected that studies not limited to 3GPP specifications will be promoted in the future. For example, ensuring interoperability, reducing costs by implementing higher layers, using or switching between multiple RATs (Radio Access Technology), supporting regulations in each country, data acquisition, distribution, database management, and LTE or NR V2X platform. It is expected that the usage method will be examined.

In the embodiment, it is mainly assumed that the communication device is mounted on the vehicle, but the embodiment is not limited to the embodiment. For example, the communication device may be a terminal held by a person, the communication device may be a device mounted on a drone or an aircraft, and the communication device may be a base station, an RSU, a relay station (relay node), or the like. It may be a terminal or the like having a scheduling ability.

In addition, SL (Sidelink) may be distinguished based on any or combination of UL (Uplink) or DL (Downlink) and the following 1) -4). Further, SL may have another name.
1) Resource allocation in the time domain 2) Resource allocation in the frequency domain 3) Synchronization signal to be referenced (including SLSS (Sidelink Synchronization Signal))
4) Reference signal used for path loss measurement for transmission power control

Also, regarding SL or UL OFDM (Orthogonal Frequency Division Multiplexing), CP-OFDM (Cyclic-Prefix OFDM), DFT-S-OFDM (Discrete Fourier Transform-Spread-OFDM), Transform Precoded OFDM or Transferformed Any of the above OFDM may be applied.

In LTE SL, Mode 3 and Mode 4 are defined regarding the allocation of SL resources to the terminal 20. In Mode3, transmission resources are dynamically allocated by DCI (Downlink Control Information) transmitted from the base station 10 to the terminal 20. In addition, SPS (SemiPersistent Scheduling) is also possible in Mode3. In Mode 4, the terminal 20 autonomously selects a transmission resource from the resource pool.

Note that the slot in the embodiment of the present invention may be read as a symbol, a mini slot, a subframe, a wireless frame, and a TTI (Transmission Time Interval). Further, the cell in the embodiment of the present invention may be read as a cell group, a carrier component, a BWP, a resource pool, a resource, a RAT (Radio Access Technology), a system (including a wireless LAN), or the like.

In the embodiment of the present invention, the terminal 20 is not limited to the V2X terminal, and may be any type of terminal that performs D2D communication. For example, the terminal 20 may be a terminal owned by a user such as a smartphone, or may be an IoT (Internet of Things) device such as a smart meter.

FIG. 2 is a diagram for explaining an example (1) of the transmission mode of V2X. In the sidelink communication transmission mode shown in FIG. 2, in step 1, the base station 10 transmits the sidelink scheduling to the terminal 20A. Subsequently, the terminal 20A transmits PSCCH (Physical Sidelink Control Channel) and PSCH (Physical Sidelink Shared Channel) to the terminal 20B based on the received scheduling (step 2). The transmission mode of the side link communication shown in FIG. 2 may be referred to as the side link transmission mode 3 in LTE. In LTE sidelink transmission mode 3, Uu-based sidelink scheduling is performed. Uu is a wireless interface between UTRAN (Universal Terrestrial Radio Access Network) and UE (User Equipment). The transmission mode of the side link communication shown in FIG. 2 may be referred to as the side link transmission mode 1 in NR.

FIG. 3 is a diagram for explaining an example (2) of the transmission mode of V2X. In the side-link communication transmission mode shown in FIG. 3, in step 1, terminal 20A transmits PSCCH and PSCH to terminal 20B using autonomously selected resources. The transmission mode of the side link communication shown in FIG. 3 may be referred to as the side link transmission mode 4 in LTE. In the side link transmission mode 4 in LTE, the UE itself executes resource selection.

FIG. 4 is a diagram for explaining an example (3) of the transmission mode of V2X. In the side-link communication transmission mode shown in FIG. 4, in step 1, terminal 20A transmits PSCCH and PSCH to terminal 20B using autonomously selected resources. Similarly, terminal 20B uses autonomously selected resources to transmit PSCCH and PSCH to terminal 20A (step 1). The transmission mode of the side link communication shown in FIG. 4 may be referred to as the side link transmission mode 2a in NR. In the side link transmission mode 2 in NR, the terminal 20 itself executes resource selection.

FIG. 5 is a diagram for explaining an example (4) of the transmission mode of V2X. In the side link communication transmission mode shown in FIG. 5, in step 0, the base station 10 transmits the side link grant to the terminal 20A via the RRC (Radio Resource Control) setting. Subsequently, the terminal 20A transmits the PSCH to the terminal 20B based on the received resource pattern (step 1). The transmission mode of the side link communication shown in FIG. 5 may be referred to as the side link transmission mode 2c in NR.

FIG. 6 is a diagram for explaining an example (5) of the transmission mode of V2X. In the side link communication transmission mode shown in FIG. 6, in step 1, the terminal 20A transmits the side link scheduling information to the terminal 20B via the PSCCH. Subsequently, the terminal 20B transmits the PSCH to the terminal 20A based on the received scheduling information (step 2). The transmission mode of the side link communication shown in FIG. 6 may be referred to as the side link transmission mode 2d in NR.

FIG. 7 is a diagram for explaining an example (1) of the communication type of V2X. The sidelink communication type shown in FIG. 7 is unicast. Terminal 20A transmits PSCCH and PSCH to terminal 20. In the example shown in FIG. 7, the terminal 20A unicasts to the terminal 20B and also unicasts to the terminal 20C.

FIG. 8 is a diagram for explaining an example (2) of the communication type of V2X. The sidelink communication type shown in FIG. 8 is group cast. Terminal 20A transmits PSCCH and PSCH to the group to which one or more terminals 20 belong. In the example shown in FIG. 8, the group includes a terminal 20B and a terminal 20C, and the terminal 20A performs a group cast to the group.

FIG. 9 is a diagram for explaining an example (3) of the communication type of V2X. The sidelink communication type shown in FIG. 9 is broadcast. Terminal 20A transmits PSCCH and PSCH to one or more terminals 20. In the example shown in FIG. 9, terminal 20A broadcasts to terminal 20B, terminal 20C and terminal 20D. The terminal 20A shown in FIGS. 7 to 9 may be referred to as a header UE.

Hereinafter, when the

terminals

20A, 20B, etc. are not particularly distinguished, they are simply described as "terminal 20" or "user device". The operation according to the embodiment of the present invention can be applied when both the terminal 20A and the terminal 20B are within the coverage of the cell and when at least one of the terminal 20A and the terminal 20B is out of the coverage.

As described above, in the present embodiment, the terminal 20 is a device mounted on a vehicle such as an automobile, and has a cellular communication function as a UE in LTE or NR and a side link function. There is. The terminal 20 may be a general mobile terminal (smartphone or the like). Further, the terminal 20 may be an RSU. The RSU may be a UE type RSU having a UE function or a gNB type RSU having a base station device function.

The terminal 20 does not have to be a device in one housing. For example, even when various sensors are distributed and arranged in the vehicle, the device including the various sensors is the terminal 20.

Further, the processing content of the transmission data of the side link of the terminal 20 is basically the same as the processing content of UL transmission in LTE or NR. For example, the terminal 20 scrambles and modulates the code word of the transmission data to generate complex-valued symbols, maps the complex-valued symbols (transmission signal) to one or two layers, and performs precoding. Then, precoded complex-valued symbols are mapped to resource elements to generate a transmission signal (example: complex-valued time-domain SC-FDMA signal), which is transmitted from each antenna port.

The base station 10 has a cellular communication function as a base station in LTE or NR, and a function for enabling communication of the terminal 20 in the present embodiment (example: resource pool setting, resource allocation, etc.). have. Further, the base station 10 may be an RSU (gNB type RSU).

Further, in the wireless communication system according to the embodiment of the present invention, the signal waveform used by the terminal 20 for SL or UL may be OFDMA, SC-FDMA, or other signal waveform. It may be.

(Periodicity-dependent resource exclusion based on periodic reservation)
In Resource allocation mode 2, the terminal 20 autonomously selects resources.

FIG. 10 is a diagram showing an example of a transmission operation. In the resource allocation mode 2 (Resource allocation mode 2), the terminal 20 selects a resource and transmits the resource. As shown in FIG. 10, the terminal 20 executes sensing in the sensing window in the resource pool. By sensing, the terminal 20 receives a resource reservation field or a resource allocation field included in the SCI transmitted from another terminal 20, and selects a resource in the resource pool based on the field. Identify available resource candidates in the window (resource selection window). Subsequently, the terminal 20 randomly selects a resource from the available resource candidates.

Further, as shown in FIG. 10, the resource pool setting may have a period. For example, the period is called a hyperframe and may be a period of 10240 milliseconds. FIG. 10 shows an example in which slots t ₀ ^SL to slot t _Tmax ^SL are set as resource pools. The area of the resource pool in the hyperframe may be set by, for example, a bitmap.

Further, as shown in FIG. 10, it is assumed that the transmission trigger in the terminal 20 is generated in the slot n and the priority of the transmission is _pTX . The terminal 20 can detect, for example, that another terminal 20 is _{transmitting the priority p RX} in the sensing window from the slot n-T ₀ to the slot immediately before the slot n-T _{proc, 0.} .. When SCI is detected in the sensing window and RSRP (Reference Signal Received Power) exceeds the threshold value, the resource in the resource selection window corresponding to the SCI is excluded. Further, when SCI is detected in the sensing window and RSRP is less than the threshold value, the resource in the resource selection window corresponding to the SCI is not excluded. The threshold value is, for example, based on the priority _{p TX} and priority _{p RX,} set for each resource in the sensing window or being defined threshold _{Th pTX,} may be _PRx.

Also, as the slot t _m ^SL shown in FIG. 10, for example, for transmission, resources in the resource selection window that are candidates for resource reservation information corresponding to the resources in the sensing window was not monitored are excluded.

In the resource selection window from slot n + T ₁ to slot n + T ₂ , as shown in FIG. 10, a resource occupied by another terminal is identified, and a resource excluding the resource becomes a usable resource candidate. If the set of available resources candidates and S _A, S _A is the case of below 20% of the resource selection window, the threshold Th _pTX set for each resource of the sensing _window, again resources 3dB increase the _pRX Identification may be performed. That is, the threshold Th _pTX, by executing the identification again resources to raise the _PRx, increase the resources that RSRP is not excluded for less than the threshold, the set S _A of the resource candidate 20% or more of the resource selection window and It may be. If S _A is less than 20% of the resource selection window, the threshold Th _pTX set for each resource of the sensing _{window, PRx} may be operation repeated to perform identification again resources by 3dB rise.

Lower layer of the terminal 20 may report the S _A to the upper layer. The upper layer of the terminal 20 may determine the resources to be used by running the random selection against S _A. The terminal 20 may execute the side link transmission using the determined resource.

(1) As an operation of resource selection, the terminal 20 reads (senses) the control information (SCI) of the side link of another terminal, and determines the resources that can be used based on the information (resource authentication).
(2) The terminal 20 reads the resource reservation protocol field of the SCI of the other terminal, and excludes the resources at equal intervals based on the cycle from the resource candidates selected by the terminal 20 (exclude).
(3) For a slot in which the SCI of another terminal cannot be read, such as when the terminal 20 is transmitting, the terminal 20 uses all the resources that can be specified by the resource reservation resource field of the SCI of the other terminal. Exclude from candidates for selected resources.

FIG. 11 is a diagram showing an example in which the terminal 20 excludes resources that can be specified by the SCI of another terminal. For example, as shown in FIG. 11, the terminal 20 reads the SCI of another terminal in step S101, and in step S102, all resources that can be specified by the resource reservation relay field of the SCI of the other terminal, that is, the period. Resources are excluded from the resource candidates selected by the terminal 20.

Currently, the above item (3) is being discussed at the 3GPP meeting. When periodic resources are excluded from the resource candidates selected by the terminal 20 based on the slots that the terminal 20 did not monitor in the sensing window, the periodic resources corresponding to 15 different cycles It has been pointed out that exclusions can result in the exclusion of more resources than necessary. In this way, when a large amount of resources are excluded from the resources selected by the terminal 20 and the resources are selected from the remaining resources, the terminal 20 may select the resources with large interference.

FIG. 12 is a diagram showing an example in which resources are periodically excluded from the resource candidates selected by the terminal 20 based on the slots that the terminal 20 did not monitor in the sensing window.

The following options have been proposed to solve this problem:
Option 1: Apply all cycles set for terminal 20 without changing the current procedure.

Option 2: Change the current procedure.

Option 2a: Exclude resources based only on the cycle used by the selected resource of terminal 20 (only the resource at the beginning of the cycle is excluded).

Option 2b: Do not apply the step to exclude resources.

Option 2c: Apply different set of cycles, such as a set of reduced cycles or a set of separately set cycles.

Regarding option 1, as described above, when a large amount of resources are excluded from the resources selected by the terminal 20 and resources are selected from the remaining resources, the terminal 20 may select a resource having a large interference. There is sex.

In option 2a, especially when the period is small, many resources to be excluded are not excluded, and the probability that the resource selected by the terminal 20 collides with the resource selected by another terminal is high. .. FIG. 13 is a diagram showing an example in which only the first resource of the cycle is excluded.

In option 2b, the probability that the resource selected by the terminal 20 collides with the resource selected by another terminal becomes very high. Option 2c may result in insufficient resource exclusion.

(Proposal)
In some sensing window, it is assumed that the terminal 20 at the t _m ^SL slot is not performed sensing. In this case, for each period (periopathy), the terminal 20 is a resource selected by the terminal 20 based on whether or not there is an SCI detection timing of another terminal other than _tm ^{SL in the sensing window.} You may decide the action to exclude the resource from the candidates.

(A-1)
For each cycle, if there is a detection timing of SCI in another terminal other than t _m ^SL in the sensing window, the terminal 20 may attempt to decode the SCI at least one of detection timing other than the t _m ^SL, the When the SCI having a cycle is decoded, all the resources at equal intervals corresponding to the cycle may be excluded from the resource candidates selected by the terminal 20. In this case, in the frequency domain, the resource to be excluded may be a resource of all sub-channels or a resource of a sub-channel determined based on the decoded SCI. When the above-mentioned A-1 is applied, the resources of the subchannel determined based on the decoded SCI may be excluded from the exclusion of the resources based on other cycles.

FIG. 14 is a diagram showing an operation example of A-1. Terminal 20 is assumed to not be performed sensing at the _t ^{m SL} slot. For example, the terminal 20 decodes the SCI of another terminal having a cycle of 4 slots in _{slot n−T 0 for a cycle of 4 slots.} In this case, the terminal 20 may exclude all resources at intervals of 4 slots based on the period of 4 slots.

(A-2)
For each cycle, _{if there is an SCI detection timing of another terminal other than tm} ^SL in the sensing window, the terminal 20 attempts to decode the SCI at at least one of the detection timings, and the SCI having the cycle is determined. If it is not decrypted (ie, the SCI that specifies the cycle has not been transmitted), the resource exclusion based on the cycle need not be performed.

FIG. 15 is a diagram showing an operation example of A-2. Terminal 20 is assumed to terminal 20 at the _t ^{m SL} slot is not performed sensing. In this case, _{it is assumed that slot n−T 0} is the SCI detection timing of a terminal other than _tm ^SL in the sensing window. For example, it is assumed that the terminal 20 cannot decode the SCI of another terminal having a cycle of 4 slots in _{slot n−T 0 for a cycle of 4 slots.} In this case, the terminal 20 does not have to exclude resources based on the cycle of 4 slots.

(A-3)
For each cycle, _{when there is a detection timing of SCI of another terminal other than tm} ^SL in the sensing window, and the terminal 20 cannot try to decode at all the detection timings (sensing can be performed). If not), all the resources at equal intervals corresponding to the cycle may be excluded from the resource candidates selected by the terminal 20 from the resource candidates selected by the terminal 20.

FIG. 16 is a diagram showing an operation example of A-3. Terminal 20 is assumed to not be performed sensing at the _t ^{m SL} slot. In this case, _{it is assumed that slot n−T 0} is the SCI detection timing of a terminal other than _tm ^SL in the sensing window. For example, it is assumed that the terminal 20 does not decode the SCI of another terminal (does not perform sensing) in _{the slot n−T 0 for the cycle of 4 slots.} In this case, the terminal 20 may exclude all resources at intervals of 4 slots from the resource candidates selected by the terminal 20 based on the cycle of 4 slots.

(B-1)
For each cycle, _{if there is no SCI detection timing of another terminal other than tm} ^SL in the sensing window, the terminal 20 is selected from the resource candidates selected by the terminal 20 among the resources at equal intervals corresponding to the cycle. , The resource located at the beginning in terms of time (the first resource) may be excluded from the resource candidates selected by the terminal 20.

FIG. 17 is a diagram showing an operation example of B-1. Terminal 20 is assumed to not be performed sensing at the _t ^{m SL} slot. In this case, it is assumed that there is no SCI detection timing of a terminal other than _tm ^SL in the sensing window for a cycle of 10 slots. In this case, the terminal 20 may exclude the first (first) resource of the plurality of resources at 10-slot intervals with respect to the time from the resource candidates selected by the terminal 20 based on the cycle of 10 slots. ..

(B-2)
For each cycle, _{if there is no SCI detection timing of another terminal other than tm} ^SL in the sensing window, the terminal 20 selects all the resources at equal intervals corresponding to the cycle from the resource candidates selected by the terminal 20. It may be excluded.

In either case of the above A-1 ~ A-3 and B-1 ~ B-2 _also, the detection timing of the other terminals SCI other than ^{t m SL} is limited to a later time than the _t ^{m SL} slot You may.

According to the methods A-1 to A-3 and B-1 to B-2 described above, it is possible to exclude appropriate resources according to the cycle, and the resources selected by the terminal 20 and other terminals are selected. It is possible to lower the collision probability (transmission collision probability) of the resources to be used.

(Device configuration)
Next, a functional configuration example of the base station 10 and the terminal 20 that execute the processes and operations described so far will be described. The base station 10 and the terminal 20 include a function of carrying out the above-described embodiment. However, the base station 10 and the terminal 20 may each have only a part of the functions in the embodiment.

<Base station 10>
FIG. 18 is a diagram showing an example of the functional configuration of the base station 10. As shown in FIG. 18, the base station 10 includes a transmission unit 110, a reception unit 120, a setting unit 130, and a control unit 140. The functional configuration shown in FIG. 18 is only an example. Any function classification and name of the functional unit may be used as long as the operation according to the embodiment of the present invention can be executed.

The transmission unit 110 includes a function of generating a signal to be transmitted to the terminal 20 side and transmitting the signal wirelessly. The receiving unit 120 includes a function of receiving various signals transmitted from the terminal 20 and acquiring information of, for example, a higher layer from the received signals. Further, the transmission unit 110 has a function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL / UL control signal, DL reference signal and the like to the terminal 20.

The setting unit 130 stores preset setting information and various setting information to be transmitted to the terminal 20 in the storage device, and reads the setting information from the storage device as needed. The content of the setting information is, for example, information related to the setting of D2D communication.

As described in the embodiment, the control unit 140 performs processing related to the setting for the terminal 20 to perform D2D communication. Further, the control unit 140 transmits the scheduling information of the D2D communication and the DL communication to the terminal 20 via the transmission unit 110. Further, the control unit 140 receives information related to the HARQ response of the D2D communication and the DL communication from the terminal 20 via the reception unit 120. The function unit related to signal transmission in the control unit 140 may be included in the transmission unit 110, and the function unit related to signal reception in the control unit 140 may be included in the reception unit 120.

<Terminal 20>
FIG. 19 is a diagram showing an example of the functional configuration of the terminal 20. As shown in FIG. 19, the terminal 20 has a transmitting unit 210, a receiving unit 220, a setting unit 230, and a control unit 240. The functional configuration shown in FIG. 19 is only an example. Any function classification and name of the functional unit may be used as long as the operation according to the embodiment of the present invention can be executed.

The transmission unit 210 creates a transmission signal from the transmission data and wirelessly transmits the transmission signal. The receiving unit 220 wirelessly receives various signals and acquires a signal of a higher layer from the received signal of the physical layer. Further, the receiving unit 220 has a function of receiving the NR-PSS, NR-SSS, NR-PBCH, DL / UL / SL control signal, reference signal, etc. transmitted from the base station 10. Further, for example, the transmission unit 210 connects the other terminal 20 to PSCCH (Physical Sidelink Control Channel), PSCH (Physical Sidelink Shared Channel), PSDCH (Physical Sidelink Discovery Channel), PSBCH (Physical Sidelink Broadcast Channel) as D2D communication. Etc., and the receiving unit 220 receives the PSCCH, PSCH, PSDCH, PSBCH, etc. from the other terminal 20.

The setting unit 230 stores various setting information received from the base station 10 or the terminal 20 by the receiving unit 220 in the storage device, and reads it out from the storage device as needed. The setting unit 230 also stores preset setting information. The content of the setting information is, for example, information related to the setting of D2D communication.

The control unit 240 controls D2D communication with another terminal 20 as described in the embodiment. For example, when the receiving unit 220 cannot sense the side link control information transmitted from another terminal at a specific timing in the sensing window, the side link control information other than the specific timing in the sensing window. If there is another detection timing corresponding to a specific cycle among the plurality of cycles, the control information of the side link is decoded at the other detection timing. When the receiving unit 220 can decode the side link control information at another detection timing, the control unit 240 excludes the resource from the set of resources included in the resource selection window based on the side link control information. .. The transmission unit 210 executes transmission to another terminal by using a resource selected from a set of resources other than the resource excluded by the control unit 240 from the set of resources included in the resource selection window.

(Hardware configuration)
The block diagrams (FIGS. 18 and 19) used in the description of the above embodiment show blocks of functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Further, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized by using one physically or logically connected device, or directly or indirectly (for example, two or more physically or logically separated devices). , Wired, wireless, etc.) and may be realized using these plurality of devices. The functional block may be realized by combining the software with the one device or the plurality of devices.

Functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, and assumption. Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but limited to these I can't. For example, a functional block (constituent unit) that makes transmission function is called a transmitting unit (transmitting unit) or a transmitter (transmitter). As described above, the method of realizing each of them is not particularly limited.

For example, the base station 10, the terminal 20, and the like in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure. FIG. 20 is a diagram showing an example of the hardware configuration of the base station 10 and the terminal 20 according to the embodiment of the present disclosure. The above-mentioned base station 10 and terminal 20 are physically configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. May be good.

In the following explanation, the word "device" can be read as a circuit, device, unit, etc. The hardware configuration of the base station 10 and the terminal 20 may be configured to include one or more of the devices shown in the figure, or may be configured not to include some of the devices.

For each function of the base station 10 and the terminal 20, the processor 1001 performs an operation by loading predetermined software (program) on the hardware such as the processor 1001 and the storage device 1002, and controls the communication by the communication device 1004. It is realized by controlling at least one of reading and writing of data in the storage device 1002 and the auxiliary storage device 1003.

Processor 1001 operates, for example, an operating system to control the entire computer. The processor 1001 may be composed of a central processing unit (CPU: Central Processing Unit) including an interface with a peripheral device, a control device, an arithmetic unit, a register, and the like. For example, the above-mentioned control unit 140, control unit 240, and the like may be realized by the processor 1001.

Further, the processor 1001 reads a program (program code), a software module, data, or the like from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiment is used. For example, the control unit 140 of the base station 10 shown in FIG. 18 may be realized by a control program stored in the storage device 1002 and operated by the processor 1001. Further, for example, the control unit 240 of the terminal 20 shown in FIG. 19 may be realized by a control program stored in the storage device 1002 and operated by the processor 1001. Although the above-mentioned various processes have been described as being executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. Processor 1001 may be implemented by one or more chips. The program may be transmitted from the network via a telecommunication line.

The storage device 1002 is a computer-readable recording medium, for example, by at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), and the like. It may be configured. The storage device 1002 may be referred to as a register, a cache, a main memory (main storage device), or the like. The storage device 1002 can store a program (program code), a software module, or the like that can be executed to implement the communication method according to the embodiment of the present disclosure.

The auxiliary storage device 1003 is a computer-readable recording medium, and is, for example, an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, an optical magnetic disk (for example, a compact disk, a digital versatile disk, Blu). -It may be composed of at least one of a ray (registered trademark) disk), a smart card, a flash memory (for example, a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, and the like. The storage medium described above may be, for example, a database, server or other suitable medium containing at least one of the storage device 1002 and the auxiliary storage device 1003.

The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, or the like. The communication device 1004 includes, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, and the like in order to realize at least one of frequency division duplex (FDD: Frequency Division Duplex) and time division duplex (TDD: Time Division Duplex). It may be composed of. For example, the transmission / reception antenna, the amplifier unit, the transmission / reception unit, the transmission line interface, and the like may be realized by the communication device 1004. The transmission / reception unit may be physically or logically separated from each other in the transmission unit and the reception unit.

The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives an input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

Further, each device such as the processor 1001 and the storage device 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured by using a single bus, or may be configured by using a different bus for each device.

Further, the base station 10 and the terminal 20 are hardware such as a microprocessor, a digital signal processor (DSP: Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array). It may be configured to include, and a part or all of each functional block may be realized by the hardware. For example, processor 1001 may be implemented using at least one of these hardware.

(Summary of embodiments)
This specification discloses at least the following terminals and communication methods.

When the control information of the side link transmitted from another terminal cannot be sensed at a specific timing in the sensing window, other detection of the control information of the side link other than the specific timing in the sensing window. When there is another detection timing corresponding to a specific cycle among the plurality of cycles, a receiving unit that decodes the control information of the side link at the other detection timing and the receiving unit. When the control information of the side link can be decoded at the other detection timing, the control unit that excludes the resource from the set of resources included in the resource selection window based on the control information of the side link, and the above. A terminal having a transmission unit that executes transmission to another terminal using a resource selected from a set of resources other than the resources excluded by the control unit among the set of resources included in the resource selection window.

According to the above configuration, when periodically excluding resources from resource candidates based on slots that the terminal did not monitor in the sensing window, it is possible to appropriately select the resources to be excluded. A way to do it is provided.

When the control information of the side link has the specific cycle, the control unit may exclude all the equally spaced resources corresponding to the specific cycle from the set of resources included in the resource selection window. ..

According to the above configuration, it is possible to reduce the probability that the transmission by the terminal collides with the transmission by another terminal.

When the receiving unit is unable to decode the control information of the side link at the other detection timing for the specific cycle, the control unit can use the set of resources included in the resource selection window. , All equidistant resources corresponding to the particular period may be excluded.

When there is no other detection timing corresponding to the specific cycle, the control unit is the earliest in terms of time among the equally spaced resources corresponding to the specific cycle from the set of resources included in the resource selection window. Resources placed in the position of may be excluded.

According to the above configuration, it is possible to reduce the probability that the transmission by the terminal collides with the transmission by another terminal while reducing the resources to be excluded.

When the control information of the side link transmitted from another terminal cannot be sensed at a specific timing in the sensing window, other detection of the control information of the side link other than the specific timing in the sensing window. When there is another detection timing corresponding to a specific cycle among the plurality of cycles, the step of decoding the control information of the side link at the other detection timing and the other detection When the control information of the side link can be decrypted at the timing, the step of excluding the resource from the set of resources included in the resource selection window based on the control information of the side link is included in the resource selection window. A communication method by a terminal having a step of executing transmission to another terminal using a resource selected from the set of resources other than the excluded resource among the set of resources.

(Supplement to the embodiment)
Although the embodiments of the present invention have been described above, the disclosed inventions are not limited to such embodiments, and those skilled in the art can understand various modifications, modifications, alternatives, substitutions, and the like. There will be. Although explanations have been given using specific numerical examples in order to promote understanding of the invention, these numerical values are merely examples and any appropriate value may be used unless otherwise specified. The classification of items in the above description is not essential to the present invention, and items described in two or more items may be used in combination as necessary, and items described in one item may be used in combination with another item. It may be applied (as long as there is no contradiction) to the matters described in. The boundary of the functional unit or the processing unit in the functional block diagram does not always correspond to the boundary of the physical component. The operation of the plurality of functional units may be physically performed by one component, or the operation of one functional unit may be physically performed by a plurality of components. Regarding the processing procedure described in the embodiment, the processing order may be changed as long as there is no contradiction. For convenience of processing description, the terminal 20 and the base station 10 have been described with reference to functional block diagrams, but such devices may be implemented in hardware, software, or a combination thereof. The software operated by the processor of the terminal 20 according to the embodiment of the present invention and the software operated by the processor of the base station 10 according to the embodiment of the present invention are random access memory (RAM), flash memory, and read-only memory, respectively. It may be stored in (ROM), EPROM, EEPROM, registers, hard disk (HDD), removable disk, CD-ROM, database, server or any other suitable storage medium.

The notification of information is not limited to the mode / embodiment described in the present disclosure, and may be performed by using another method. For example, information notification includes physical layer signaling (for example, DCI (Downlink Control Information), UCI (Uplink Control Information)), higher layer signaling (for example, RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, etc. It may be carried out by notification information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof. Further, the RRC signaling may be called an RRC message, and may be, for example, an RRC connection setup (RRC Connection Setup) message, an RRC connection reconfiguration (RRC Connection Reconfiguration) message, or the like.

Each aspect / embodiment described in the present disclosure includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), and 5G (5th generation mobile communication). system), FRA (Future Radio Access), NR (new Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)) )), LTE 802.16 (WiMAX®), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth®, and other systems that utilize suitable systems and have been extended based on these. It may be applied to at least one of the next generation systems. Further, a plurality of systems may be applied in combination (for example, a combination of at least one of LTE and LTE-A and 5G).

The order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in the present disclosure may be changed as long as there is no contradiction. For example, the methods described in the present disclosure present elements of various steps using exemplary order, and are not limited to the particular order presented.

In some cases, the specific operation performed by the base station 10 in the present disclosure may be performed by its upper node. In a network consisting of one or more network nodes having a base station 10, various operations performed for communication with a terminal are performed by the base station 10 and other network nodes other than the base station 10 (for example,). , MME, S-GW, etc., but not limited to these). Although the case where there is one network node other than the base station 10 is illustrated above, it may be a combination of a plurality of other network nodes (for example, MME and S-GW).

The input / output information and the like may be stored in a specific location (for example, memory) or may be managed using a management table. Input / output information and the like can be overwritten, updated, or added. The output information and the like may be deleted. The input information or the like may be transmitted to another device.

The determination may be made by a value represented by 1 bit (0 or 1), by a true / false value (Boolean: true or false), or by comparing numerical values (for example, a predetermined value). It may be done by comparison with the value).

Each aspect / embodiment described in the present disclosure may be used alone, in combination, or switched with execution. Further, the notification of predetermined information (for example, the notification of "being X") is not limited to the explicit one, but is performed implicitly (for example, the notification of the predetermined information is not performed). May be good.

Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or other names, is an instruction, instruction set, code, code segment, program code, program, subprogram, software module. , Applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc. should be broadly interpreted.

Further, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, the software uses at least one of wired technology (coaxial cable, optical fiber cable, twisted pair, digital subscriber line (DSL: Digital Subscriber Line), etc.) and wireless technology (infrared, microwave, etc.) to create a website. When transmitted from a server, or other remote source, at least one of these wired and wireless technologies is included within the definition of transmission medium.

The information, signals, etc. described in this disclosure may be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description are voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. It may be represented by a combination of.

Note that the terms explained in the present disclosure and the terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Also, the signal may be a message. Further, the component carrier (CC: Component Carrier) may be referred to as a carrier frequency, a cell, a frequency carrier, or the like.

The terms "system" and "network" used in this disclosure are used interchangeably. In addition, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, relative values from predetermined values, or using other corresponding information. It may be represented. For example, the radio resource may be one indicated by an index.

The names used for the above parameters are not limited in any respect. Further, mathematical formulas and the like using these parameters may differ from those explicitly disclosed in this disclosure. Since the various channels (eg, PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, the various names assigned to these various channels and information elements are in any respect limited names. is not it.

In this disclosure, "base station (BS: Base Station)", "wireless base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", " "Access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "cell group" Terms such as "carrier" and "component carrier" can be used interchangeably. Base stations are sometimes referred to by terms such as macrocells, small cells, femtocells, and picocells.

The base station can accommodate one or more (for example, three) cells. When a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, a small indoor base station (RRH:)). Communication services can also be provided by Remote Radio Head). The term "cell" or "sector" refers to part or all of the coverage area of at least one of the base stations and base station subsystems that provide communication services in this coverage. Point to.

In the present disclosure, terms such as "mobile station (MS: Mobile Station)", "user terminal", "user device (UE: User Equipment)", and "terminal" may be used interchangeably. ..

Mobile stations can be used by those skilled in the art as subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless. It may also be referred to as a terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable term.

At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, or the like. At least one of the base station and the mobile station may be a device mounted on the mobile body, the mobile body itself, or the like. The moving body may be a vehicle (for example, a car, an airplane, etc.), an unmanned moving body (for example, a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned type). ) May be. It should be noted that at least one of the base station and the mobile station includes a device that does not necessarily move during communication operation. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

Further, the base station in the present disclosure may be read by the user terminal. For example, communication between a base station and a user terminal has been replaced with communication between a plurality of user terminals (for example, it may be referred to as D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.). Each aspect / embodiment of the present disclosure may be applied to the configuration. In this case, the terminal 20 may have the function of the base station 10 described above. In addition, words such as "up" and "down" may be read as words corresponding to communication between terminals (for example, "side"). For example, the upstream channel, the downstream channel, and the like may be read as a side channel. Similarly, the user terminal in the present disclosure may be read as a base station. In this case, the base station 10 may have the functions of the terminal 20 described above.

The terms "connected", "coupled", or any variation thereof, mean any direct or indirect connection or connection between two or more elements, and each other. It can include the presence of one or more intermediate elements between two "connected" or "combined" elements. The connections or connections between the elements may be physical, logical, or a combination thereof. For example, "connection" may be read as "access". As used in the present disclosure, the two elements use at least one of one or more wires, cables and printed electrical connections, and, as some non-limiting and non-comprehensive examples, the radio frequency domain. Can be considered to be "connected" or "coupled" to each other using electromagnetic energy having wavelengths in the microwave and light (both visible and invisible) regions.

The reference signal can also be abbreviated as RS (Reference Signal), and may be called a pilot depending on the applicable standard.

The phrase "based on" as used in this disclosure does not mean "based on" unless otherwise stated. In other words, the statement "based on" means both "based only" and "at least based on".

When used in the present disclosure are "include," "include," and variants thereof, these terms are as comprehensive as the term "comprising." Is intended. Furthermore, the term "or" used in the present disclosure is intended not to be an exclusive OR.

In the present disclosure, when articles are added by translation, for example, a, an and the in English, the disclosure may include that the nouns following these articles are plural.

In the present disclosure, the term "A and B are different" may mean "A and B are different from each other". The term may mean that "A and B are different from C". Terms such as "separate" and "combined" may be interpreted in the same way as "different".

Although the present invention has been described in detail above, it is clear to those skilled in the art that the present invention is not limited to the embodiments described in the present specification. The present invention can be implemented as modifications and modifications without departing from the spirit and scope of the invention as defined by the claims. Therefore, the description of the present specification is for the purpose of exemplification and does not have any limiting meaning to the present invention.

This international patent application claims its priority based on Japanese Patent Application No. 2020-07386 filed on April 22, 2020, and the entire contents of Japanese Patent Application No. 2020-076386 are included in the present application. Invite.

10 Base station 110 Transmission unit 120 Reception unit 130 Setting unit 140 Control unit 20 Terminal 210 Transmission unit 220 Reception unit 230 Setting unit 240 Control unit 1001 Processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication device 1005 Input device 1006 Output device

Claims

When the control information of the side link transmitted from another terminal cannot be sensed at a specific timing in the sensing window, other detection of the control information of the side link other than the specific timing in the sensing window. When there is another detection timing corresponding to a specific cycle among the plurality of cycles, the receiving unit that decodes the control information of the side link at the other detection timing.
When the receiving unit can decode the control information of the side link at the other detection timing, the control unit excludes the resource from the set of resources included in the resource selection window based on the control information of the side link. When,
Among the set of resources included in the resource selection window, a transmission unit that executes transmission to another terminal using a resource selected from a set of resources other than the resource excluded by the control unit, and a transmission unit.
Terminal with.
When the control information of the side link has the specific cycle, the control unit excludes all the equally spaced resources corresponding to the specific cycle from the set of resources included in the resource selection window.
The terminal according to claim 1.
When the receiving unit is unable to decode the control information of the side link at the other detection timing for the specific cycle, the control unit can use the set of resources included in the resource selection window. , Exclude all equidistant resources corresponding to the particular period,
The terminal according to claim 1.
When there is no other detection timing corresponding to the specific cycle, the control unit is the earliest in terms of time among the equally spaced resources corresponding to the specific cycle from the set of resources included in the resource selection window. Exclude resources placed in the position of,
The terminal according to claim 1.
When the control information of the side link transmitted from another terminal cannot be sensed at a specific timing in the sensing window, other detection of the control information of the side link other than the specific timing in the sensing window. When there is another detection timing corresponding to a specific cycle among the plurality of cycles, the step of decoding the control information of the side link at the other detection timing, and
When the control information of the side link can be decoded at the other detection timing, the step of excluding the resource from the set of resources included in the resource selection window based on the control information of the side link, and
A step of executing transmission to another terminal using a resource selected from a set of resources other than the excluded resource among the set of resources included in the resource selection window, and a step of executing transmission to another terminal.
Communication method by the terminal having.