WO2022249850A1

WO2022249850A1 - User equipment and base station

Info

Publication number: WO2022249850A1
Application number: PCT/JP2022/019147
Authority: WO
Inventors: 恒夫中田
Original assignee: 株式会社デンソー
Priority date: 2021-05-26
Filing date: 2022-04-27
Publication date: 2022-12-01
Also published as: JP2022181627A

Abstract

User equipment (100) according to an aspect disclosed herein comprises: an information acquisition unit (131) for acquiring, as a result of a measurement based on an uplink reference signal transmitted by first user equipment (100), valid information related to the result of the measurement that is valid for second user equipment (100), and for acquiring user equipment information indicating the second user equipment; and a communication processing unit (133) for transmitting the valid information and the user equipment information to an uplink using control information.

Description

User Equipment and Base Station

Cross-reference to related applications

This application is based on Japanese Application No. 2021-88661 filed on May 26, 2021, and the contents thereof are incorporated herein.

The present disclosure relates to user equipment and base stations.

A mobile communication technology has been proposed in the 3GPP (3rd Generation Partnership Project) and standardized as a Technical Specification (TS). Especially now, 5G (5th Generation) technology has been proposed and standardized.

In recent years, cooperative uplink (UL) by multiple user equipment (UE) has begun to be considered. For example, in Patent Document 1, data is shared from a source UE to a plurality of UEs via sidelinks, and a base station sends MIMO (Multi Input Multi Output) parameters to the plurality of UEs that have received SRS (Sounding Reference Signal). and the UEs transmit the data to the base station using the notified MIMO parameters.

U.S. Patent Application Publication No. 2020/0336178

According to the above-mentioned Patent Document 1, a base station transmits an SRS to the base station for each of a plurality of UEs that transmit data to the base station. However, as a result of detailed studies by the inventors, the following problems were found. That is, as the number of UEs increases, the resources used for SRS increase.

An object of the present disclosure is to provide a user equipment and a base station that can suppress an increase in resources used for uplink reference signals even if the number of UEs communicating on the uplink increases.

A user equipment (100) according to one aspect of the present disclosure provides a measurement result based on an uplink reference signal transmitted by a first user equipment (100) valid for a second user equipment (100). an information acquisition unit (131) for acquiring useful information about a result of a measurement and user equipment information indicative of said second user equipment; and transmitting said useful information and said user equipment information in uplink using control information. and a communication processing unit (133) for transmission.

A base station (200) according to one aspect of the present disclosure provides a measurement result based on an uplink reference signal transmitted by a first user equipment (100) valid for a second user equipment (100). a communication processing unit (243) for receiving on the uplink, using control information, useful information about a result of a measurement and user equipment information of said second user equipment; an information acquisition unit (241) for acquiring device information;

According to the present disclosure, even if the number of UEs communicating on the uplink increases, it is possible to suppress an increase in resources used for uplink reference signals. It should be noted that the present disclosure may provide other effects instead of or in addition to the above effects.

1 is a diagram illustrating an example of a schematic configuration of a system according to a first embodiment of the present disclosure; FIG. 3 is a block diagram showing an example of a schematic functional configuration of a user device according to the embodiment; FIG. 2 is a block diagram showing an example of a schematic hardware configuration of a user device according to the embodiment; FIG. 3 is a block diagram showing an example of a schematic functional configuration of a base station according to this embodiment; FIG. It is a block diagram showing an example of a schematic hardware configuration of a base station according to the present embodiment. FIG. 4 is an explanatory diagram for explaining an example of a measurement result regarding the position of the user equipment and the channel used according to the present embodiment; FIG. 4 is an explanatory diagram for explaining an example of identification of an uplink reference signal related to the measurement result based on the effective information according to the present embodiment; FIG. 4 is a sequence diagram for explaining an example of a schematic flow of processing according to the embodiment; FIG. 11 is an explanatory diagram for explaining an example of a period indicated by timing information according to a second modification of the embodiment; FIG. 11 is a sequence diagram for explaining an example of a schematic flow of processing for configuring a user equipment to transmit valid information and user equipment information according to a third modification of the present embodiment; FIG. 14 is a sequence diagram for explaining an example of transmission of valid information and user equipment information according to another form of the third modification of the present embodiment; FIG. 21 is a sequence diagram for explaining an example of transmission of valid information and user equipment information according to the fourth modification of the embodiment; FIG. 21 is a sequence diagram for explaining an example of transmission of valid information and user equipment information according to another form of the fourth modification of the present embodiment; FIG. 10 is a diagram showing an example of a schematic configuration of a system according to a second embodiment of the present disclosure; FIG. FIG. 4 is a sequence diagram for explaining an example of a schematic flow of processing according to the embodiment; FIG. 4 is an explanatory diagram for explaining an example of the position of the user equipment and the results of the above-mentioned measurement used according to the present embodiment; FIG. 5 is a diagram for explaining application example 1 according to each embodiment of the present disclosure; FIG. 5 is a diagram for explaining application example 1 according to each embodiment of the present disclosure; FIG. 5 is a diagram for explaining application example 1 according to each embodiment of the present disclosure; FIG. 11 is a diagram for explaining an application example 2 according to each embodiment of the present disclosure; FIG. 11 is a diagram for explaining an application example 2 according to each embodiment of the present disclosure; FIG. 11 is a diagram for explaining an application example 2 according to each embodiment of the present disclosure;

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In addition, in the present specification and drawings, elements that can be described in the same manner can be omitted from redundant description by assigning the same reference numerals.

The description is given in the following order.
1. First Embodiment 1.1. System configuration 1.2. Configuration of User Device 1.3. Configuration of Base Station 1.4. Operation example 1.5. Modification 2. Second Embodiment 2.1. System configuration 2.2. Operation example 2.3. Modification 3. Application example 3.1. Application example 1
3.2. Application example 2

<1. First Embodiment>
A first embodiment of the present disclosure will be described. In this embodiment, a UE transmits data on the uplink using uplink reference signals transmitted by other UEs.

<1.1. System configuration>
An example of the configuration of a system 1 according to the first embodiment of the present disclosure will be described with reference to FIG. Referring to FIG. 1 , system 1 includes UE 100 (UE 100A and UE 100B) and base station 200 .

For example, system 1 is a system that complies with the Technical Specifications (TS) of 3GPP (Third Generation Partnership Project). More specifically, for example, the system 1 is a system conforming to 5G or NR (New Radio) TS. Naturally, the system 1 is not limited to this example.

(1) Base station 200
Base station 200 is a node of a radio access network (RAN) and communicates with UEs (eg, UE 100A and UE 100B) located within the coverage area of base station 200. FIG.

For example, the base station 200 communicates with UEs (eg, UE 100A and UE 100B) using the RAN protocol stack. For example, the protocol stack includes RRC (Radio Resource Control), SDAP (Service Data Adaptation Protocol), PDCP (Packet Data Convergence Protocol), RLC (Radio Link Control), MAC (Medium Access Control), and Physical: PHY) layer protocol. Alternatively, the protocol stack may not include all of these protocols, but some of these protocols.

For example, the base station 200 is a gNB. A gNB is a node that provides NR user plane and control plane protocol terminations towards the UE and is connected to the 5GC (5G Core Network) via the NG interface. Alternatively, base station 200 may be an en-gNB. An en-gNB is a node that provides NR user plane and control plane protocol termination for UEs and acts as a secondary node in EN-DC (E-UTRA-NR Dual Connectivity).

The base station 200 may include multiple nodes. The plurality of nodes may include a first node that hosts a higher layer included in the protocol stack and a second node that hosts a lower layer included in the protocol stack. good. The upper layers may include an RRC layer, an SDAP layer and a PDCP layer, and the lower layers may include an RLC layer, a MAC layer and a PHY layer. The first node may be a CU (central unit), and the second node may be a DU (Distributed Unit). Note that the plurality of nodes may include a third node that performs lower-level processing of the PHY layer, and the second node may perform higher-level processing of the PHY layer. The third node may be an RU (Radio Unit).

Alternatively, the base station 200 may be one of the plurality of nodes, or may be connected to another unit of the plurality of nodes.

The base station 200 may be an IAB (Integrated Access and Backhaul) donor or an IAB node.

(2) UE 100
UE 100 (UE 100A and UE 100B) communicates with base station 200 when located within the coverage area of base station 200 . The UE 100 receives signals from the base station 200 on the downlink and transmits signals to the base station 200 on the uplink. In other words, the UE 100 communicates with the base station 200 via the Uu interface.

For example, the UE 100 communicates with the base station 200 using the above protocol stack. For example, UE 100 communicates with other UEs using the above protocol stack.

Also, the UE 100 communicates directly with other UEs without going through the base station 200. Specifically, the UE 100 communicates with other UEs on the sidelink. In other words, UE 100 communicates with other UEs via the PC5 interface. Also, the UE 100 may communicate with other UEs via a communication path including multiple sidelinks. Here, direct communication refers to communication through a route that does not go through the base station 200, and includes communication through a single link and communication through a route consisting of multiple links. A communication path consisting of a plurality of links is provided, for example, by relaying communications by the UE 100C, which is capable of communicating with both the UE 100A and the UE 100B through a single link. Such communication via relay by the UE 100C is generally called multi-hop communication.

For example, the UE 100 (eg, UE 100A) operates in sidelink resource allocation mode 2. That is, the UE 100A selects a radio resource within the sidelink resource pool, and uses the selected radio resource to transmit a signal on the sidelink. For example, UE 100A transmits a signal to other UE 100 (for example, UE 100B) on the sidelink.

Note that the UE 100 may directly communicate with another UE using a communication scheme other than the sidelink. For example, the UE 100 communicates with other UEs using a wireless LAN (Local Area Network) such as Wi-Fi (registered trademark) or a wireless PAN (Personal Area Network) such as Bluetooth (registered trademark) or Zigbee (registered trademark). may communicate. Even when using these communication schemes, the UE 100 may communicate with other UEs using multi-hop communication including relay.

Also, the UE 100 may be mounted on a mobile object. For example, the mobile object is a vehicle. A vehicle uses UE 100 to communicate with base station 200 . For example, the UE 100 is an in-vehicle device that can be mounted on a vehicle. Note that the mobile object may be an aircraft or a ship.

<1.2. User device configuration>
An example of the configuration of the UE 100 according to the first embodiment of the present disclosure will be described with reference to FIGS. 2 and 3. FIG.

(1) Functional Configuration First, an example of the functional configuration of the UE 100 according to the embodiment of the present disclosure will be described with reference to FIG. Referring to FIG. 2, the UE 100 includes a wireless communication unit 110, a storage unit 120 and a processing unit .

The wireless communication unit 110 wirelessly transmits and receives signals. For example, the wireless communication unit 110 receives signals from base stations and transmits signals to the base stations. For example, the radio communication unit 110 receives signals from other UEs and transmits signals to other UEs.

The storage unit 120 stores various information.

The processing unit 130 provides various functions of the UE 100. The processing unit 130 includes an information acquisition unit 131 and a communication processing unit 133 . Note that the processing unit 130 may further include components other than these components. That is, the processing unit 130 can perform operations other than those of these components. Specific operations of the information acquisition unit 131 and the communication processing unit 133 will be described later in detail.

For example, the processing unit 130 (communication processing unit 133) communicates with a base station (for example, the base station 200) or another UE via the wireless communication unit 110.

(2) Hardware Configuration Next, an example of the hardware configuration of the UE 100 according to the embodiment of the present disclosure will be described with reference to FIG. Referring to FIG. 3, UE 100 comprises antenna 181 , RF (radio frequency) circuitry 183 , processor 185 , memory 187 and storage 189 .

Antenna 181 converts a signal into radio waves and radiates the radio waves into space. Also, the antenna 181 receives radio waves in space and converts the radio waves into signals. Antenna 181 may include a transmit antenna and a receive antenna, or may be a single antenna for transmission and reception. Antenna 181 may be a directional antenna and may include multiple antenna elements.

The RF circuit 183 performs analog processing of signals transmitted and received via the antenna 181 . RF circuitry 183 may include high frequency filters, amplifiers, modulators, low pass filters, and the like.

The processor 185 performs digital processing of signals transmitted and received via the antenna 181 and the RF circuit 183. The digital processing includes processing of the protocol stack of the RAN. Processor 185 may include multiple processors or may be a single processor. The multiple processors may include a baseband processor that performs the digital processing and one or more processors that perform other processing.

The memory 187 stores programs executed by the processor 185, parameters related to the programs, and data related to the programs. The memory 187 may include at least one of ROM (Read Only Memory), EPROM (Erasable Programmable Read Only Memory), EEPROM (Electrically Erasable Programmable Read Only Memory), RAM (Random Access Memory), and flash memory. All or part of memory 187 may be included within processor 185 .

The storage 189 stores various information. The storage 189 may include at least one of SSD (Solid State Drive) and HDD (Hard Disc Drive).

The wireless communication unit 110 may be implemented by an antenna 181 and an RF circuit 183. Storage unit 120 may be implemented by storage 189 . Processing unit 130 may be implemented by processor 185 and memory 187 .

The processing unit 130 may be implemented by an SoC (System on Chip) including a processor 185 and a memory 187. The SoC may include RF circuitry 183 and the wireless communication unit 110 may also be implemented by the SoC.

Considering the above hardware configuration, the UE 100 may include a memory that stores the program (ie, memory 187) and one or more processors that can execute the program (ie, processor 185). One or more processors may execute the programs described above to perform the operations of the processing unit 130 . The program may be a program for causing the processor to execute the operation of the processing unit 130 .

<1.3. Configuration of Base Station>
An example of the configuration of the base station 200 according to the first embodiment of the present disclosure will be described with reference to FIGS. 4 and 5. FIG.

(1) Functional Configuration First, an example of the functional configuration of the base station 200 according to the first embodiment of the present disclosure will be described with reference to FIG. Referring to FIG. 4, the base station 200 includes a wireless communication unit 210, a network communication unit 220, a storage unit 230 and a processing unit 240. FIG.

The wireless communication unit 210 wirelessly transmits and receives signals. For example, the radio communication unit 210 receives signals from UEs and transmits signals to the UEs.

The network communication unit 220 receives signals from the network and transmits signals to the network.

The storage unit 230 stores various information for the base station 200.

The processing unit 240 provides various functions of the base station 200. The processing unit 240 includes an information acquisition unit 241 , a communication processing unit 243 and a control unit 245 . Note that the processing unit 240 may further include other components other than these components. That is, the processing unit 240 can perform operations other than those of these components. Specific operations of the information acquisition unit 241, communication processing unit 243, and control unit 245 will be described in detail later.

For example, the processing unit 240 (communication processing unit 243) communicates with the UE (eg, UE 100) via the wireless communication unit 210. For example, the processing unit 240 (communication processing unit 243) communicates with other nodes (for example, network nodes in the core network or other base stations) via the network communication unit 220. FIG.

(2) Hardware Configuration Next, an example hardware configuration of the base station 200 according to the first embodiment of the present disclosure will be described with reference to FIG. Referring to FIG. 5, base station 200 comprises antenna 281 , RF circuitry 283 , network interface 285 , processor 287 , memory 289 and storage 291 .

The antenna 281 converts the signal into radio waves and radiates the radio waves into space. Also, the antenna 281 receives radio waves in space and converts the radio waves into signals. Antenna 281 may include a transmit antenna and a receive antenna, or may be a single antenna for transmission and reception. Antenna 281 may be a directional antenna and may include multiple antenna elements.

The RF circuit 283 performs analog processing of signals transmitted and received via the antenna 281 . RF circuitry 283 may include high frequency filters, amplifiers, modulators, low pass filters, and the like.

The network interface 285 is, for example, a network adapter, which transmits signals to and receives signals from the network.

The processor 287 performs digital processing of signals transmitted and received via the antenna 281 and the RF circuit 283. The digital processing includes processing of the protocol stack of the RAN. Processor 287 also processes signals sent and received via network interface 285 . Processor 287 may include multiple processors or may be a single processor. The multiple processors may include a baseband processor that performs the digital processing and one or more processors that perform other processing.

The memory 289 stores programs executed by the processor 287, parameters related to the programs, and data related to the programs. Memory 289 may include at least one of ROM, EPROM, EEPROM, RAM, and flash memory. All or part of memory 289 may be included within processor 287 .

The storage 291 stores various information. The storage 291 may include at least one of SSD and HDD.

The wireless communication unit 210 may be implemented by an antenna 281 and an RF circuit 283. Network communication unit 220 may be implemented by network interface 285 . Storage unit 230 may be implemented by storage 291 . Processing unit 240 may be implemented by processor 287 and memory 289

A part or all of the processing unit 240 may be virtualized. In other words, part or all of the processing unit 240 may be implemented as a virtual machine. In this case, part or all of the processing unit 240 may operate as a virtual machine on a physical machine (that is, hardware) including a processor, memory, etc. and a hypervisor.

Considering the above hardware configuration, the base station 200 may include a memory for storing programs (ie, memory 289) and one or more processors (ie, processor 287) capable of executing the programs. , the one or more processors may execute the program to perform the operation of the processing unit 240 . The program may be a program for causing the processor to execute the operation of the processing unit 240 .

<1.4. Operation example>
An example of operations of the UE 100 and the base station 200 according to the first embodiment of the present disclosure will be described with reference to FIGS. 6 to 8. FIG. In this embodiment, the UE 100 can operate as a first UE, a second UE, a third UE, or any two or all of them.

(1) Operation of first UE The UE 100 operating as the first UE (also referred to as the first UE 100) transmits an uplink reference signal.

- Transmission of uplink reference signal The first UE 100 (communication processing unit 133) transmits an uplink reference signal. For example, the uplink reference signal is a sounding reference signal (SRS).

For example, the uplink reference signal transmitted by the first UE 100 is used for uplink communication of another UE (eg, the second UE). For example, the first UE 100 is mounted on a vehicle preceding the vehicle on which the second UE 100 is mounted.

For example, the UE 100A and the UE 100B are mounted on vehicles traveling in a row. UE 100A operates as a first UE, and UE 100B operates as a second UE. Referring to FIG. 6, UE 100A and UE 100B move side by side in the order of UE 100A and UE 100B. Therefore, while each vehicle is moving in the direction of travel, the position of UE 100A will be the future position of UE 100B. UE 100A transmits SRS, and UE 100B communicates with base station 200. FIG. Therefore, the result of measurement based on the SRS is valid for UE 100B that has reached the position of UE 100 at the time of transmission of the SRS. The period required for UE 100B to reach the position of UE 100A is calculated by [distance between UE 100A and UE 100B]÷[vehicle speed].

(2) Operation of Second UE The UE 100 (also referred to as the second UE 100) operating as the second UE acquires uplink resources and transmits data without sending SRS.

- Transmission of scheduling request The second UE 100 (communication processing unit 133) transmits a scheduling request on the uplink. For example, the scheduling request is a scheduling request signal (SR signal).

For example, when a data transmission request occurs, the second UE 100 transmits a scheduling request on the uplink. Upon receiving the scheduling request, the base station 200 schedules the second UE 100 . Scheduling is, for example, resource allocation. The base station 200 transmits resource allocation information indicating allocated uplink resources to the second UE 100 on the downlink. In scheduling, the base station 200 uses the channel measurement result based on the SRS received from the first UE 100 instead of the SRS received from the second UE 100 . As a result, the second UE 100 is allocated resources for data transmission without SRS transmission. The second UE 100 transmits data using the allocated resources.

(3) Operation of the third UE The UE 100 (also referred to as the third UE 100) operating as the third UE transmits applied SRS information regarding the SRS transmitted by the first UE 100 and available for the second UE 100 on the uplink.

- Applicable SRS information (effective information and UE information)
Applicable SRS information includes availability information and UE information. Validity information relates to results of measurements based on uplink reference signals transmitted by the first UE 100 that are valid for the second UE 100 . The UE information indicates the second UE 100 concerned. Specifically, the third UE 100 (information acquisition unit 131) acquires the valid information and the UE information. The third UE 100 (communication processing unit 133) transmits applicable SRS information including the above valid information and the above UE information on the uplink.

The validity information indicates an uplink reference signal related to the result of the above measurement that is valid for the second UE 100. Details will be described with reference to FIG. In the example of FIG. 7, the UE 100 operates as the first UE and the third UE.

For example, referring to the example of FIG. 7, the UE 100 transmits SRS at timings 11-17. The base station 200 receives each SRS and performs measurements based on each SRS. After that, at timing 19, the UE 100 transmits valid information and UE information. The validity information indicates SRSs that are valid for the second UE 100 among SRSs that have been transmitted in the past. For example, the valid information is the identification information of the SRS. In the example of FIG. 7, the valid information is information indicating SRS2.

Thereby, effective measurement results for the second UE 100 can be identified.

Also, the valid information may indicate the uplink reference signal by directly indicating the transmission timing of the uplink reference signal. In the example of FIG. 7, the valid information indicates timing 13, which is the transmission timing of SRS2. For example, the useful information is a system frame number, a subframe number, a slot number, a symbol number, or a combination of two or more of a system frame number, a subframe number, a slot number, and a symbol number, and the uplink reference signal indicates the transmission timing of

By this means, even if an identifier is not assigned to the SRS, it is possible to identify the SRS relating to the valid measurement results for the second UE 100.

Also, the effective information may be generated based on the positional relationship between the first UE 100 and the second UE 100. For example, the third UE 100 identifies an uplink reference signal corresponding to the above measurement result valid for the second UE 100 based on the distance between the first UE 100 and the second UE 100 and the moving speed of the second UE 100 . Then, the third UE 100 generates valid information indicating the uplink reference signal. Note that the positional relationship between the first UE 100 and the second UE 100 may be stored in advance in the third UE 100, or may be acquired from the base station 200 or another UE.

- Transmission of applied SRS information The third UE 100 transmits applied SRS information on the uplink. For example, the third UE 100 (communication processing unit 133) periodically transmits applicable SRS information including validity information and user equipment information on the uplink.

This makes it possible to transmit valid information and user equipment information without control information. That is, the overhead associated with the transmission of valid information and user equipment information can be reduced.

(4) Base station operation The base station 200 receives an uplink reference signal from the first UE 100 and performs measurements based on the uplink reference signal. The base station 200 receives the applied SRS information from the third UE 100 and schedules the second UE 100 using the above measurement results identified based on the applied SRS information.

- Measurement based on uplink reference signal The base station 200 receives an uplink reference signal from the first UE 100 and performs measurement based on the uplink reference signal.

Specifically, the base station 200 (control unit 245) performs channel-related measurements based on the uplink reference signal received from the first UE 100. For example, the measurement includes channel estimation, SINR (Signal to Interference plus Noise Ratio) measurement, identification of the best resource block, calculation of the preferred precoding matrix, calculation of the preferred number of layers, and the like.

For example, referring to FIG. 7, the base station 200 (control unit 245) measures each of SRS1 to SRS9 transmitted from the UE100. The base station 200 (storage unit 230) stores each result of the measurement. The measurement result may be associated with the identifier of the SRS used for the measurement, or may be associated with the transmission timing of the SRS.

- Scheduling based on applied SRS information The base station 200 receives the applied SRS information from the third UE 100, and performs scheduling for the second UE 100 based on the results of the above measurements and the effective information and UE information included in the applied SRS information. conduct.

Specifically, the base station 200 (communication processing unit 243) receives the above valid information and UE information on the uplink using control information. The base station 200 (information acquisition unit 241) acquires the effective information and the UE information from the control information. The base station 200 (control unit 245) identifies the valid measurement result for the second UE 100 indicated by the UE information based on the valid information. The base station 200 (control unit 245) associates the identified measurement result with the UE information.

Also, the base station 200 (communication processing unit 243) receives the scheduling request. The base station 200 (control unit 245) acquires the measurement result associated with the second UE 100 that is the transmission source of the received scheduling request. The base station 200 (control unit 245) allocates uplink resources using the obtained measurement results. The base station 200 (communication processing unit 243) transmits resource allocation information indicating allocation of the uplink resource to the second UE 100 indicated by the UE information.

Referring to FIG. 7, at timing 19, the base station 200 receives applied SRS information transmitted by the UEs 100 operating as the first UE and the third UE. The base station 200 identifies SRS2 received at timing 13 from the valid information included in the applicable SRS information, and identifies the result of the above measurement corresponding to SRS2. The base station 200 associates the identified measurement result (or SRS2) with the second UE 100 indicated by the UE information.

The base station 200 receives the scheduling request from the second UE 100 and acquires the result of the measurement associated with the second UE 100. The base station 200 performs uplink scheduling (for example, resource allocation) for the second UE 100 based on the obtained measurement results. The base station 200 transmits resource allocation information to the second UE 100. For example, the resource allocation information is downlink control information (DCI) for resource allocation. The second UE 100 transmits data to the base station 200 based on the DCI.

This makes it possible to allocate resources to the second UE 100 without receiving an uplink reference signal from the second UE 100. Therefore, even if the number of UEs communicating on the uplink increases, it is possible to suppress an increase in resources used for uplink reference signals.

(5) Flow of Processing An example of processing according to the first embodiment of the present disclosure will be described with reference to FIG. In the example of FIG. 8, the UE 100A operates as the first UE and the third UE, and the UE 100B operates as the second UE.

The UE 100A transmits an uplink reference signal (S301). For example, when the UE 100A receives an SRS request from the base station 200, the UE 100A periodically transmits the SRS. Base station 200 makes measurements based on the received SRS.

The UE 100A transmits valid information and UE information on the uplink (S303). For example, the UE 100A periodically transmits applicable SRS information including availability information and UE information on the uplink. For example, the valid information indicates SRS2 and the UE information indicates UE100B.

The UE 100B transmits a scheduling request on the uplink (S305). For example, the UE 100B transmits an SR signal on the uplink when a data transmission request occurs.

The base station 200 transmits resource allocation information to the UE 100B on the downlink (S307). For example, the base station 200 identifies SRS2 that is valid for the UE 100B that has transmitted the SR signal based on the received valid information and UE information, and obtains the results of measurements performed based on the SRS2. The base station 200 allocates resources to the received UE 100B based on the measurement result. The base station 200 transmits resource allocation information indicating allocation of the resource to the UE 100B.

The UE 100B transmits data on the uplink (S309). For example, the UE 100B transmits data on the uplink using resources indicated by the received resource allocation information.

Thus, according to the first embodiment of the present disclosure, uplink resources can be allocated to the second UE 100 without the second UE 100 transmitting an uplink reference signal. Therefore, even if the number of UEs communicating on the uplink increases, it is possible to suppress an increase in resources used for uplink reference signals.

<1.5. Variation>
First to fourth modifications according to the first embodiment of the present disclosure will be described with reference to FIGS. 9 to 13. FIG. Note that two or more of these modifications may be combined.

(1) First Modification In the above-described example of the first embodiment of the present disclosure, the validity information indicates the uplink reference signal by directly indicating the transmission timing of the uplink reference signal. However, the valid information according to the first embodiment of the present disclosure is not limited to this example.

As a first modification of the first embodiment of the present disclosure, the validity information may indicate the uplink reference signal by indirectly indicating the transmission timing of the uplink reference signal.

Specifically, the validity information may indicate the uplink reference signal by indicating the period between the transmission timing of the uplink reference signal and other timings related to the validity information and the user equipment information. For example, the validity information is the transmission timing of the validity information and the UE information.

For example, referring to FIG. 7 again, at timing 19, the UE 100 transmits valid information and UE information. When the valid SRS is SRS2, the valid information indicates a period 21 from timing 13 to timing 19 when SRS2 is transmitted. The base station 200 can calculate the timing 13 at which the SRS2 is transmitted from the period 21 indicated by the validity information and the timing 19 at which the validity information is transmitted. That is, the base station 200 can determine that the valid information indicates SRS2. Note that the period 21 is calculated, for example, as follows.
[Period 21]=[distance between first UE 100 and second UE 100]÷[vehicle speed]

As a result, the information amount of the effective information can be suppressed.

Also, the validity information may indicate the uplink reference signal by indicating a period between the transmission timing of the uplink reference signal and another timing that is the transmission timing of another uplink reference signal. Specifically, other uplink reference signals are identified based on the transmission timing of the availability information and UE information.

For example, referring to FIG. 7 again, SRS9, which is closest to timing 19 when the validity information and UE information are transmitted, is identified as another uplink reference signal. When the valid SRS is SRS2, the validity information indicates a period 23 from timing 13 when SRS2 is transmitted to timing 17 when SRS9 is transmitted. The base station 200 can calculate the timing 13 when the SRS2 is transmitted from the period 23 indicated by the validity information and the timing 17 when the SRS9 is transmitted. That is, the base station 200 can identify SRS2.

As a result, it is possible to flexibly indicate the uplink reference signal to be enabled using the transmission timing of the uplink reference signal. In particular, when the uplink reference signal is continuously transmitted at predetermined intervals, it becomes easy to identify the uplink reference signal to be enabled.

For example, the useful information may indicate the period in terms of radio frames, subframes, slots, symbols, or a combination of two or more of radio frames, subframes, slots, and symbols.

Also, the valid information may include information indicating the first UE 100. For example, as shown in FIG. 7, the valid information includes identification information of the first UE 100 that transmitted the uplink reference signal. The uplink reference signal is identified by the identification information of the first UE 100.

Thereby, even when SRSs are transmitted from a plurality of first UEs 100, the base station 200 can distinguish the transmission sources and identify the SRSs.

(2) Second Modification In the above-described example of the first embodiment of the present disclosure, the result of the measurement becomes valid at the transmission timing of valid information. However, the timing at which the result of the measurement according to the first embodiment of the present disclosure becomes valid is not limited to this example.

As a second modification of the first embodiment of the present disclosure, the validity information may include timing information regarding the timing at which the above measurement result becomes valid for the second UE 100. Specifically, the timing information indicates the timing at which the measurement results become valid. For example, the timing information indirectly indicates when the result of the measurement becomes valid.

For example, the timing information indicates the period between the timing when the result of the above measurement becomes valid and other timings regarding valid information and UE information. More specifically, the other timing is the timing at which the validity information is transmitted on the uplink.

For example, referring to FIG. 9, at timing 31, the UE 100 operating as the third UE transmits valid information including timing information and UE information. Based on the validity information and the UE information, the base station 200 identifies valid measurement results. Further, the base station 200 validates the result of the measurement at timing 33 after the period 41 indicated by the timing information has elapsed from the reception timing 31 of the valid information. Note that the timing information may be transmitted separately from the validity information.

For example, the timing information indicates the period by radio frames, subframes, slots, symbols, or a combination of two or more of radio frames, subframes, slots, and symbols.

It should be noted that the timing information may directly indicate the timing at which the above measurement results become valid. In the example of FIG. 9, the timing information indicates timing 33, which is the timing at which the measurement results become valid. For example, the timing information indicates the timing by a system frame number, subframe number, slot number, symbol number, or a combination of two or more of system frame number, subframe number, slot number and symbol number.

Also, the timing information may be generated based on changes in the positional relationship between the first UE 100 and the second UE 100. For example, the third UE 100 acquires information indicating the distance between the first UE 100 and the second UE 100 at predetermined time intervals, and calculates changes in the distance. Then, the third UE 100 calculates the period or timing based on the change in distance and the moving speed of the second UE 100 .

Here, the relative positions of the 1st UE 100 and the 2nd UE 100 fluctuate, the timing at which the measurement result becomes valid according to the validity information, and the 2nd UE 100 reaches the position where the uplink reference signal corresponding to the measurement result is transmitted. There may be a difference between when In this case, the influence of CSI Aging (Channel State Information Aging) on the results of the above measurements may increase. That is, the accuracy or accuracy of scheduling based on the results of the above measurements may decrease.

However, according to the second modified example, the timing difference can be suppressed. Therefore, even if the relative positions of the first UE 100 and the second UE 100 fluctuate, the influence of CSI aging on the above measurement results can be suppressed. That is, it is possible to improve the precision or accuracy of scheduling based on the results of the above measurements.

(3) Third Modification In the above-described example of the first embodiment of the present disclosure, the third UE 100 periodically transmits valid information. However, the method of transmitting valid information according to the first embodiment of the present disclosure is not limited to this example.

As a third modification of the first embodiment of the present disclosure, when the third UE 100 receives configuration information for transmission of valid information and UE information, even if the valid information and UE information are transmitted in the uplink, good. Specifically, when the third UE 100 (communication processing unit 133) receives an RRC message including configuration information for transmitting valid information and UE information on the downlink, the valid information and UE information are transmitted according to the configuration information. Send by uplink. Also, the base station 200 (communication processing unit 243) transmits an RRC message including configuration information for transmission of valid information and UE information on the downlink. The configuration information can also be said to be information that configures the UE 100 to transmit valid information and UE information.

For example, when the third UE 100 (communication processing unit 133) receives an RRC message including configuration information for transmission of validity information and UE information, it transmits the validity information and UE information on the uplink according to the configuration information. On the other hand, when the third UE 100 (communication processing unit 133) does not receive the RRC message including the configuration information, it does not transmit the valid information and the UE information on the uplink. In this case, the second UE 100 (communication processing unit 133) transmits an uplink reference signal.

Referring to FIG. 10, the base station 200 transmits an RRC message including configuration information for transmission of valid information and UE information to the UE 100, and the UE 100 acting as the third UE receives the RRC message (S401). . UE 100 transmits a response message to the RRC message to base station 200 (S403). For example, the configuration information is included in SRS-Config in the RRC message. For example, the RRC message is an RRCReconfiguration message and the response message is an RRCReconfigurationComplete message.

This makes it possible to flexibly control the transmission of valid information and UE information. In other words, it is possible to flexibly control whether or not to use uplink reference signals transmitted by other UEs.

Further, as another form of the third modification, as described in the first modification, the valid information is the transmission timing of the uplink reference signal and the transmission timing of the other uplink reference signal. , the third UE 100 may transmit the validity information and the UE information in advance.

For example, the third UE 100 may transmit valid information and UE information when communicating an RRC message. Specifically, when the third UE 100 (communication processing unit 133) receives an RRC message including configuration information for transmitting valid information and UE information on the downlink, as a response to the RRC message, valid information and Send UE information on the uplink. The base station 200 (communication processing unit 243) receives the valid information and UE information on the uplink as a response to the RRC message.

Also, the third UE 100 (communication processing unit 133) transmits the UE information on the uplink after responding to the RRC message (that is, after transmitting the validity information and the UE information). The other timing is indicated by the transmission of the UE information. After responding to the RRC message, the base station 200 (communication processing unit 243) receives the UE information on the uplink.

Referring to FIG. 11, the UE 100 operating as the first UE and the third UE receives the RRC message including the configuration information from the base station 200 (S501).

The UE 100 transmits a response message to the RRC message, which includes validity information and UE information, to the base station 200 (S503). The validity information indicates the period between the transmission timing of a certain SRS and the transmission timing of another SRS. For example, referring to FIG. 7 again, the validity information indicates the period 23 between the transmission timing of SRS2 and the transmission timing of SRS9. Also, the period indicated by the valid information is associated with the UE information. For example, period 23 is associated with the identification information of the second UE 100 .

After transmitting the response message, the UE 100 transmits the SRS (S505). After transmitting the SRS, the UE 100 transmits UE information (S507). The transmission timing of the UE information indicates the transmission timing of the other SRS. For example, the other SRS is an SRS transmitted immediately before the transmission timing of the UE information. Referring to FIG. 7 again, the transmission timing of the UE information corresponds to timing 19, and the other timing is timing 17, which is the transmission timing of SRS 9 immediately before timing 19. FIG. Base station 200 calculates timing 13 based on period 23 and timing 17 and identifies SRS2. The UE information transmitted after the transmission of the response message may be included in UCI (Uplink Control Information) or MAC CE (MAC Control Element).

Note that the transmission timing of the other SRS may be indicated by the second UE 100 transmitting a scheduling request instead of the third UE 100 transmitting the UE information indicating the second UE 100 after transmitting the response message.

As a result, the measurement result can be validated without sending validation information when validating the measurement result. Therefore, communication traffic can be reduced. This configuration is particularly effective when the change in the relative positions of the first UE 100 and the second UE 100 is small, because the change in the period is also small.

(4) Fourth Modification In the above-described example of the first embodiment of the present disclosure, the third UE 100 periodically transmits valid information. However, the method of transmitting valid information according to the first embodiment of the present disclosure is not limited to this example.

As a fourth modification of the first embodiment of the present disclosure, the third UE 100 may transmit the validity information and the UE information on the uplink when requested to transmit the validity information and the UE information. Specifically, the third UE 100 (communication processing unit 133) uplinks the valid information and the UE information in response to reception of downlink control information (DCI) including request information requesting transmission of the valid information and the UE information. Send with Also, the base station 200 (communication processing unit 243) transmits downlink control information including the above request information on the downlink.

Referring to the example of FIG. 12, the base station 200 (communication processing unit 243) transmits DCI including request information requesting transmission of valid information and UE information to the UE 100 operating as the third UE (S601). The UE 100 (communication processing unit 133) transmits the SRS, validity information and UE information to the base station 200 in response to the request information (S603). For example, the request information may be an SRS request set to a value requesting transmission of availability information and UE information.

This makes it possible to flexibly control the transmission of valid information and UE information. Moreover, since the effective information and the UE information are transmitted when the base station 200 requires the effective information and the UE information, the amount of communication can be reduced.

In addition, in another form of the fourth modified example, the third UE 100 may transmit valid information and UE information in response to a request from the second UE 100. Specifically, the third UE 100 (communication processing unit 133), in response to receiving control information including request information requesting transmission of valid information and user equipment information from the second UE 100 by direct communication, valid information and UE Send information on the uplink.

For example, the second UE 100 transmits control information including the request information to the third UE 100 by direct communication. When the third UE 100 receives the control information through direct communication, the third UE 100 transmits valid information and UE information through uplink. Direct communication is sidelink communication (single-hop communication using a single sidelink or multi-hop communication via multiple sidelinks). In addition, direct communication is communication using the above-mentioned wireless LAN or wireless PAN (single-hop communication using a single link in each communication method, or multi-hop communication via multiple links in each format) may be

Referring to FIG. 13, the UE 100B operating as the second UE transmits control information including the request information to the UE 100A operating as the third UE on the sidelink (S801). For example, the control information may be transmitted via PSCCH (Physical Sidelink Control Channel) or PSSCH (Physical Sidelink Shared Channel).

The UE 100A transmits effective information and UE information on the uplink in response to receiving the control information including the request information on the sidelink (S803). For example, the UE 100A transmits, on the uplink, validity information regarding the result of the measurement that is valid for the UE 100B, which is the transmission source of the control information, and UE information indicating the UE 100B.

After transmitting the control information, the UE 100B transmits a scheduling request on the uplink (S805). For example, the UE 100B transmits an SR signal on the uplink after transmitting control information on the sidelink.

It should be noted that the effective information and UE information transmitted by the UE 100A in response to receiving the above control information may be substituted for the scheduling request of the UE 100B. In this case, the UE 100B is allocated resources for data transmission without transmitting a scheduling request.

Thereby, when the second UE 100 transmits data to the base station 200, the effective information and the UE information are transmitted, so that the amount of communication can be reduced. In addition, since the validity information and the UE information are transmitted in response to a request from the second UE 100, it is possible to reduce the deviation between the timing when the measurement result becomes valid and the timing of the data transmission of the second UE 100. Therefore, resources suitable for data transmission of the second UE 100 can be allocated.
<2. Second Embodiment>
A second embodiment of the present disclosure will be described. In this embodiment, a UE cooperates with other UEs to transmit data on the uplink.

<2.1. System configuration>
An example of the configuration of the system 2 according to the second embodiment of the present disclosure will be described with reference to FIG. 14 . Referring to FIG. 14, system 2 includes UE 100 (UE 100A to UE 100C) and base station 200. FIG.

For example, System 2 is a 3GPP TS-compliant system. More specifically, for example, the system 2 is a 5G or NR TS compliant system. Of course, system 2 is not limited to this example.

(1) Base station 200
The base station 200 receives data cooperatively transmitted on the uplink from a plurality of UEs 100 located within its coverage area. For example, the base station 200 allocates resources for coordinated transmission to each of the UEs 100A to 100C, and receives coordinated transmitted data.

(2) UE 100
A UE 100 cooperates with another UE 100 to transmit data on the uplink. For example, UE 100A shares data to UE 100B and UE 100C on the sidelink, and UE 100A to UE 100C coordinately transmit the data on the uplink.

Note that the configurations of the UE 100 and the base station 200 are substantially the same as those of the first embodiment, so description thereof will be omitted.

<2.2. Operation example>
An example of operations of the UE 100 and the base station 200 according to the second embodiment of the present disclosure will be described with reference to FIGS. 15 and 16. FIG. In this embodiment, the UE 100 acting as a first, second or third UE may act as a transmitting UE, a representative UE, a coordinating UE, or any two or all of them.

(1) Operation of transmitting UE UE 100 (also called transmitting UE 100) operating as a transmitting UE transmits cooperative transmission data to be transmitted to base station 200 to UE 100 operating as a cooperative UE (also called cooperative UE 100). . Also, the transmitting UE 100 acquires a list of cooperative UEs 100 (also referred to as a cooperative UE list) as cooperative user equipment information.

- Acquisition of a coordinated UE list A coordinated UE list is two or more UEs 100 capable of transmitting or receiving coordinated transmission data in direct communication, and two or more UEs 100 capable of cooperatively transmitting coordinated transmission data to the base station 200. A UE 100 (ie two or more cooperating UEs 100) is shown. For example, the coordinated UE list indicates two or more coordinated UEs 100 to which the transmitting UE 100 can transmit coordinated transmission data. More specifically, the cooperating UE list is a list of identifiers of cooperating UEs 100 . Direct communication is sidelink communication (single-hop communication using a single sidelink or multi-hop via multiple sidelinks).

The transmitting UE 100 acquires the cooperating UE list using direct communication. Specifically, the transmitting UE 100 acquires a cooperative UE list using control information in sidelink communication. For example, the transmitting UE 100 identifies the cooperative UE 100 capable of sidelink communication using sidelink sensing or the like. Also, the transmitting UE 100 may acquire the cooperative UE list by transmitting and receiving information other than control information in sidelink communication on the sidelink.

A plurality of cooperating UEs 100 indicated by the cooperating UE list may be UEs 100 that operate as two or more second UEs. Further, when the coordinated UE 100 also operates as a coordinated UE, the plurality of coordinated UEs 100 indicated by the coordinated UE list may be the UE 100 operating as one or more first UEs and the UE 100 operating as one or more second UEs. .

By this means, it is possible to allocate resources to the cooperative UE 100 indicated by the cooperative UE list using the applied SRS information. That is, it is possible to prevent allocation of resources for cooperative transmission to UEs other than the cooperative UE 100 .

- Transmission of cooperative transmission data The transmitting UE 100 shares cooperative transmission data with the cooperative UE 100 by direct communication. Specifically, transmitting UE 100 (information acquisition unit 131) acquires a cooperative UE list. The transmitting UE 100 (communication processing unit 133) transmits cooperative transmission data to at least one cooperative UE 100 out of two or more cooperative UEs 100 indicated by the cooperative UE list, via the sidelink. Note that when the transmitting UE 100 also operates as a cooperating UE, the coordinating UE list may separately include information indicating one or more cooperating UEs 100 with which the transmitting UE 100 can communicate on the sidelink and information indicating the transmitting UE 100. That is, the transmitting UE 100 may transmit cooperative transmission data to one or more cooperative UEs 100 .

For example, the transmitting UE 100 (information acquisition unit 131) acquires cooperative transmission data within the transmitting UE 100. The transmitting UE 100 (communication processing unit 133) transmits the acquired cooperative transmission data to at least one cooperative UE 100 on the sidelink. For example, the transmitting UE 100 acquires data stored in the storage unit 120 or data received from an upper layer such as an application running on the transmitting UE 100 . The transmitting UE 100 transmits the acquired data to at least one cooperating UE 100 indicated by the cooperating UE list.

(2) Operation of representative UE The representative UE 100 transmits a cooperating UE list to the base station 200 as a representative of two or more cooperating UEs 100 .

-Transmission of coordinated UE list The representative UE 100 transmits the coordinated UE list to the base station 200 . Specifically, the representative UE 100 (information acquisition unit 131) acquires a cooperative UE list. The representative UE 100 (communication processing unit 133 ) transmits control information including the cooperative UE list to the base station 200 .

For example, the representative UE 100 (communication processing unit 133) transmits UCI including the cooperative UE list to the base station 200. Alternatively, the representative UE 100 (communication processing unit 133) transmits a MAC CE or RRC message including the coordinated UE list to the base station 200.

(3) Operation of Cooperative UE The cooperative UE 100 receives cooperative transmission data from the transmitting UE 100 and transmits the received cooperative transmission data to the base station 200 in cooperation with other cooperative UEs 100 .

- Receiving cooperative transmission data The cooperative UE 100 receives cooperative transmission data from the transmitting UE 100 by direct communication. Specifically, the cooperative UE 100 (communication processing unit 133) receives the cooperative transmission data from the transmitting UE 100 on the sidelink.

- Receiving resource allocation information The cooperative UE 100 receives resource allocation information indicating UL resources from the base station 200 . Specifically, the cooperative UE 100 (communication processing unit 133 ) receives control information including resource allocation information from the base station 200 . The cooperative UE 100 (information acquisition unit 131) acquires resource allocation information included in control information.

Also, the cooperative UE 100 receives cooperative precoding for cooperative MIMO from the base station 200 . For example, the cooperative UE 100 (communication processing unit 133) receives control information including cooperative precoding from the base station 200. FIG. The cooperative UE 100 (information acquisition unit 131) acquires cooperative precoding included in control information. Note that cooperative precoding may be included in control information included in resource allocation information.

- Transmission of cooperative transmission data A cooperative UE 100 cooperates with another cooperative UE 100 to transmit cooperative transmission data to the base station 200 .

Here, cooperative transmission means sharing and transmitting cooperative transmission data among a plurality of cooperative UEs 100 . Alternatively, cooperative transmission may mean sharing cooperative transmission data among a plurality of cooperative UEs 100 and transmitting in the same time, frequency, or space. Alternatively, cooperative transmission may mean sharing cooperative transmission data among a plurality of cooperative UEs 100 and transmitting with cooperative MIMO.

For example, the coordinated UE 100 transmits coordinated transmission data to the base station 200 using UL resources indicated by resource allocation information received from the base station 200 . When cooperative precoding is received from base station 200, cooperative UE 100 transmits cooperative transmission data to base station 200 using the received cooperative precoding. Cooperative MIMO is achieved by transmitting cooperative transmission data using cooperative precoding that is received by two or more cooperative UEs 100 respectively.

(4) Operation of First UE The operation of the first UE 100 according to the second embodiment is substantially the same as that of the first embodiment, so the description is omitted.

(5) Operation of Second UE The second UE 100 according to the second embodiment is substantially the same as in the first embodiment except that it does not transmit a scheduling request. That is, the second UE 100 transmits data using resources allocated to the base station 200 without transmitting a scheduling request or an uplink reference signal.

(6) Operation of Third UE The third UE 100 transmits applicable SRS information including valid information and UE information to the base station 200 for transmission of cooperative transmission data.

- Transmission of applied SRS information The third UE 100 transmits applied SRS information on the uplink. Specifically, the third UE 100 (communication processing unit 133) transmits effective information and UE information in the uplink in response to acquisition of cooperative transmission data.

When the third UE 100 operates as a transmitting UE, the third UE 100 transmits valid information and UE information on the uplink when it acquires cooperative transmission data within the third UE 100 .

When the third UE 100 operates as a cooperative UE, upon receiving cooperative transmission data from the transmitting UE 100 by direct communication, the third UE 100 transmits valid information and UE information on the uplink.

As a result, when the cooperative transmission data is transmitted to the base station 200, the effective information and the UE information are transmitted, so it is possible to reduce the amount of communication. In addition, since the validity information and the UE information are transmitted in response to the request for transmission of cooperative transmission data, it is possible to reduce the deviation between the timing at which the result of the measurement becomes effective and the timing at which cooperative transmission data is transmitted. Therefore, resources suitable for transmission of cooperative transmission data can be allocated.

Note that the third UE 100 may transmit the applied SRS information and the cooperative UE list at the same time. For example, the coordinated UE list is included in the control information that includes applicable SRS information.

In addition, when the coordinated UE 100 operates as the first UE, the applied SRS information may include effective information regarding the result of the measurement that is effective for the coordinated UE 100 and UE information indicating the coordinated UE 100.

(7) Base station operation The base station 200 receives an uplink reference signal from the first UE 100 and performs measurements based on the uplink reference signal. The base station 200 receives the applied SRS information from the third UE 100 and receives the cooperating UE list from the representative UE 100 . The base station 200 schedules for cooperative transmission by the cooperative UE 100 using the results of the above measurements identified based on the applied SRS information and the cooperative UE list. Note that the above measurement and reception of applied SRS information are substantially the same as in the first embodiment, so description thereof will be omitted.

- Receipt of coordinated UE list The base station 200 receives the coordinated UE list from the representative UE 100 . Specifically, the base station 200 (communication processing unit 243 ) receives control information including the cooperative UE list from the representative UE 100 . The base station 200 (information acquisition unit 241) acquires the coordinated UE list included in the control information. The base station 200 (storage unit 230) stores the acquired cooperative UE list.

- Scheduling based on applied SRS information and coordinated UE list The base station 200 receives applied SRS information from the third UE 100 and receives the coordinated UE list from the representative UE 100 . Base station 200 allocates UL resources for cooperative transmission to cooperative UE 100 based on the applied SRS information and the cooperative UE list. The base station 200 transmits resource allocation information indicating the UL resource to the cooperative UE 100 .

Specifically, when the base station 200 (control unit 245) receives the coordinated UE list on the uplink, the above measurement result indicated by the validity information is valid for the plurality of coordinated UEs 100 indicated by the coordinated UE list. UL resources are assigned to each of the coordinating UEs 100 using each of the above measurement results. Then, the base station 200 (communication processing unit 243) transmits resource allocation information indicating allocation of the UL resource to each of the coordinated UEs 100 indicated by the coordinated UE list.

As described in the first embodiment, the base station 200 associates the measurement result with the UE information based on the effective information and the UE information included in the applicable SRS information. The base station 200 acquires each of the above measurement results associated with UE information that matches each of the cooperating UEs 100 indicated by the cooperating UE list. The base station 200 allocates UL resources for cooperative transmission to each of the cooperative UEs 100 based on the obtained measurement results. The base station 200 transmits control information including resource allocation information indicating allocation of the UL resource to each of the cooperative UEs 100 concerned.

Also, the base station 200 may transmit cooperative precoding for cooperative MIMO to each cooperative UE 100. Specifically, base station 200 (control section 245) acquires cooperative precoding based on each of the above measurement results. The base station 200 (communication processing unit 243) transmits control information including cooperative precoding to each of the cooperative UEs 100 concerned.

For example, the base station 200 (communication processing unit 243) transmits DCI including resource allocation information and cooperative precoding to each cooperative UE 100.

- Receipt of coordinated transmission data The base station 200 receives coordinated transmission data transmitted by each of the coordinated UEs 100 in cooperation. Specifically, the base station 200 (communication processing unit 243) receives each coordinated transmission data transmitted by the UL resource allocated to each coordinated UE 100. FIG.

Note that the coordinated transmission data transmitted by each of the coordinated UEs 100 may be part of the entire coordinated transmission data. For example, a first portion of the overall cooperative transmission data is transmitted by cooperative UE 100-1, and a second portion different from the first portion is transmitted by cooperative UE 100-2. Also, the coordinated transmission data transmitted by each of the coordinated UEs 100 may partially or wholly overlap. For example, the first portion and the second portion may overlap. Also, the coordinated transmission data to be transmitted by two or more coordinated UEs 100 may be the entire coordinated transmission data.

For example, the base station 200 acquires the entire coordinated transmission data based on each received coordinated transmission data. More specifically, base station 200 recovers the entire coordinated transmission data based on each received portion of the entire coordinated transmission data.

(8) Flow of Processing An example of processing according to the second embodiment of the present disclosure will be described with reference to FIGS. 15 and 16. FIG. In the examples of FIGS. 15 and 16, the UE 100A operates as the transmitting UE, the representative UE and the cooperative UE, and the UE 100B and UE 100C operate as the cooperative UE. Also, the UE 100A operates as the first UE, the second UE, and the third UE, and the UE 100B and the UE 100C operate as the second UE.

The UE 100A transmits an uplink reference signal (S901). For example, UE 100A transmits SRS1 to SRS9. The UE 100A transmits the SRS at timings as shown in FIG. The base station 200 performs channel-related measurements based on the SRS transmitted from the UE 100A.

UE 100A transmits cooperative transmission data to UE 100A and UE 100B by direct communication (S903). For example, when a transmission request for cooperative transmission data is generated, UE 100A transmits cooperative transmission data to UE 100B and UE 100C operating as cooperative UEs on the sidelinks. Also, the UE 100A obtains a coordinated UE list indicating the UE 100B and the UE 100C. Also, the UE 100A acquires valid information and UE information for the UE 100B and the UE 100C.

The UE 100A transmits the effective information, the UE information and the cooperative UE list on the uplink (S905). For example, after sharing the coordinated transmission data, the UE 100A transmits applied SRS information including effective information and UE information and a coordinated UE list on the uplink.

The base station 200 transmits resource allocation information and cooperative precoding to the UEs 100A to 100C on the downlink (S907). For example, the base station 200 obtains the valid measurement results based on the applied SRS information for the UE 100B and the UE 100C indicated by the coordinated UE list. Referring to FIG. 16, SRS9 is transmitted immediately before the transmission timing of applied SRS information. At the timing when SRS9 is transmitted, UE 100B has reached the position of UE 100A at the timing when SRS8 is transmitted. The UE 100C has reached the position of the UE 100C at the timing when the SRS2 was transmitted. Therefore, the result of the measurement based on SRS8 is used for UE 100B, and the result of the measurement based on SRS2 is used for UE 100C. That is, the valid information for the UE 100B indicates SRS8, and the valid information for the UE 100C indicates SRS2. The base station 200 acquires the above measurement results based on SRS8 for the UE 100B, and acquires the above measurement results based on the SRS2 for the UE 100C. In addition, since UE 100A also operates as a cooperative UE, base station 200 also acquires the above measurement result based on SRS9. Base station 200 then allocates resources to UE 100A to UE 100C based on each of the obtained measurement results. If cooperative transmission is performed using cooperative MIMO, base station 200 also obtains cooperative precoding based on each of the above obtained measurement results. Base station 200 then transmits control information including resource allocation information and cooperative precoding to UE 100A to UE 100C.

The UE 100A to UE 100C transmit cooperative transmission data on the uplink (S909). For example, UE 100A-UE 100C transmit cooperative transmission data on the uplink using the allocated resources and cooperative precoding.

Thus, according to the second embodiment of the present disclosure, uplink resources for cooperative transmission can be allocated to cooperative UEs 100 without the cooperative UEs 100 transmitting uplink reference signals. Therefore, even if the number of UEs performing cooperative transmission increases, it is possible to suppress an increase in resources used for uplink reference signals.

<2.3. Variation>
A modification according to the second embodiment of the present disclosure will be described. Note that two or more of these modifications may be combined.

(1) Modification In the above-described example of the second embodiment of the present disclosure, the coordinated UE list and applied SRS information are transmitted in the uplink as control information for coordinated transmission. However, control information for cooperative transmission according to the second embodiment of the present disclosure is not limited to this example.

As a modification of the second embodiment of the present disclosure, the third UE 100 may transmit effective information and UE information for each of the cooperating UEs 100 indicated by the cooperating UE list. Specifically, the validity information relates to the result of the above measurement that is valid for the cooperative UE 100 operating as the second UE among the multiple cooperative UEs 100 indicated by the cooperative UE list. Also, the UE information indicates the cooperating UE 100 that operates as the second one of the plurality of cooperating UEs 100 .

For example, the applied SRS information according to the second embodiment also includes information about UEs 100 other than UEs 100 operating as cooperative UEs. Therefore, the third UE 100 transmits only applicable SRS information for the UE 100 indicated by the cooperative UE list on the uplink.

As a result, the UE 100 does not need to transmit the cooperative UE list, so it is possible to reduce resources used for control for cooperative transmission.

Note that the third UE 100 may transmit effective information and UE information about the UE 100 indicated by the group information. Specifically, the third UE 100 transmits only applicable SRS information for the UE 100 indicated by the group information on the uplink. For example, the group information indicates a group of vehicles in which the UE 100 is mounted (for example, a group of vehicles running in a row).

<3. Application example>
An application example of each embodiment of the present disclosure will be described. The system in the example application includes UE 100A-UE 100D, base station 200A and base station 200B. The UE 100A to UE 100D are mounted on vehicles, and the vehicles run in a row. UE 100A to UE 100D can communicate with each other via sidelinks.

<3.1. Application example 1>
An application example 1 of each embodiment of the present disclosure will be described with reference to FIGS. 17A to 17C.

In FIG. 17A, UE100A to UE100D are each capable of communicating with the base station 200A. The UE 100A periodically transmits SRS and applied SRS information to the base station 200A. On the other hand, UE 100B-UE 100D do not transmit SRS. Here, for example, when a data transmission request occurs in the UE 100C, the UE 100C transmits a scheduling request to the base station 200A. Based on the applied SRS information received, the base station 200A identifies an SRS valid for the UE 100C that has transmitted the scheduling request from among the SRSs received in the past, and obtains the measurement results for the channel based on the identified SRS. Then, the base station 200A allocates UL resources to the UE 100C based on the obtained measurement result. The UE 100C uses the assigned UL resource to transmit data to the base station 200A.

In FIG. 17B, the UE 100A cannot communicate with the

base stations

200A and 200B because the vehicle on which the UE 100A is mounted has entered a tunnel. Therefore, UE 100A, as a transmitting UE, shares data with UE 100B to UE 100D. Any one of UE100B to UE100D as a representative UE and a third UE transmits a coordinated UE list and applied SRS information indicating UE100B to UE100D to base station 200A. The base station 200A identifies, based on the applied SRS information, SRSs valid for UE100B to UE100D indicated by the coordinated UE list from among a plurality of SRSs transmitted by UE100A in the past, and the results of measurement based on the identified SRSs are respectively displayed. get. The base station 200A then allocates UL resources to the UEs 100B to 100D based on the respective measurement results. UE 100B-UE 100D cooperatively transmit the shared data to base station 200A using the assigned UL resources.

In FIG. 17C, the UE 100A can communicate with the base station 200B because the vehicle on which the UE 100A is mounted has left the tunnel. However, the UE 100A cannot communicate with the base station 200A because it is outside the coverage area. Also, the UE 100B cannot communicate with the

base stations

200A and 200B because the vehicle on which the UE 100B is mounted has entered the tunnel. Therefore, UE 100A shares data with UE 100C and UE 100D. Also, UE 100A, as a representative UE, transmits information indicating base station 200A operating as a cooperative base station, a cooperative UE list indicating UE 100C and UE 100D, and applied SRS information to base station 200B. The base station 200B transmits the cooperative UE list and applicable SRS information to the base station 200A. Base station 200A allocates UL resources to UE 100C and UE 100D based on the received coordinated UE list and applied SRS information. The UE 100C and UE 100D cooperatively transmit the shared data to the base station 200A using the assigned UL resources. The base station 200A transmits the data received from the UE 100C and the UE 100D to the base station 200B. The UE 100A also transmits data to the base station 200A. The base station 200B receives data from the UE 100A and the base station 200A.

In this way, a group of UEs 100 with similar movement trajectories can allocate uplink resources by using the uplink reference signal transmitted by the preceding UE 100 without transmitting an uplink reference signal. Therefore, even if the number of UEs communicating on the uplink increases, it is possible to suppress an increase in resources used for uplink reference signals. In particular, in the case of coordinated transmission by a plurality of UEs 100, uplink reference signals are transmitted from each of the plurality of UEs 100, and resources may become tight. However, according to each embodiment of the present disclosure, it is possible to avoid the tightness of the resource.

<3.2. Application example 2>
An application example 2 of each embodiment of the present disclosure will be described with reference to FIGS. 18A to 18C. In the application example 2, the vehicle and the vehicle remote control system are connected via the UE 100 and the base station 200 .

In FIG. 18A, the UE 100A cannot communicate with the base station 200A because the vehicle on which the UE 100A is mounted has moved from the coverage area of the base station 200A to the coverage area of the base station 200B. However, due to the failure occurring in the base station 200B, the UE 100A cannot communicate with the base station 200B. When UE 100A detects a communication abnormality with base station 200B, UE 100A shares information indicating the communication abnormality with UE 100B to UE 100D. Any one of UE100B to UE100D as a representative UE and a third UE transmits a coordinated UE list and applied SRS information indicating UE100B to UE100D to base station 200A. Based on the applicable SRS information, the base station 200A identifies SRSs that are valid for UE100B to UE100D indicated by the coordinated UE list from among the plurality of SRSs transmitted by UE100A in the past, and obtains the results of measurement based on the identified SRSs. Get each. The base station 200A then allocates UL resources to the UEs 100B to 100D based on the respective measurement results. The UE 100B-UE 100D cooperatively transmit the shared information to the base station 200A using the assigned UL resources.

In FIG. 18B, the UE 100B is also unable to communicate with the base station 200A because the vehicle on which the UE 100B is mounted has moved from the coverage area of the base station 200A to the coverage area of the base station 200B. However, since UE100C and UE100D can communicate with base station 200A, UE100A transmits information shared via UE100C and UE100D to base station 200A and the remote control system.

In FIG. 18C, the UE 100C is also unable to communicate with the base station 200A because the vehicle on which the UE 100C is mounted has moved from the coverage area of the base station 200A to the coverage area of the base station 200B. However, since UE 100D can communicate with base station 200A, UE 100A transmits information shared via UE 100D to base station 200A and the remote control system.

Thus, even after the UE 100A becomes unable to communicate with the base station 200A and the base station 200B, it can still communicate with the base station 200A via the UE100B to UE100D mounted on subsequent vehicles. At this time, UE 100B-UE 100D can transmit data without transmission of uplink reference signals by UE 100B-UE 100D. In other words, the overhead for data transmission of UE 100B-UE 100D is reduced. Therefore, it is possible to shorten the time required to restore the connection between the UE 100A and the remote control system due to the communication interruption between the UE 100A and the base station 200B. Thereby, the safety of the vehicle group in which the UE 100 is mounted can be improved. Especially in the case of driverless vehicles, it is effective because communication disruption affects the safety or availability of driverless operation.

Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the respective embodiments. Those skilled in the art will appreciate that each such embodiment is exemplary only and that various modifications are possible without departing from the scope and spirit of the disclosure.

For example, the steps in the processes described in this specification do not necessarily have to be executed in chronological order according to the order described in the flowcharts or sequence diagrams. For example, steps in a process may be performed in an order different from that depicted in a flowchart or sequence diagram, or in parallel. Also, some of the steps in the process may be deleted and additional steps may be added to the process.

For example, a method may be provided that includes the operation of one or more components of the apparatus described herein, and a program may be provided for causing a computer to perform the operation of the components. Further, a computer-readable non-transitional tangible recording medium recording the program may be provided. Of course, such methods, programs, and computer-readable non-transitory tangible computer-readable storage mediums are also included in the present disclosure.

For example, in this disclosure user equipment (UE) refers to a mobile station, mobile terminal, mobile device, mobile unit, subscriber station, subscriber terminal, subscriber equipment, subscriber unit, wireless It may also be called a station, a wireless terminal, a wireless device, a wireless unit, a remote station, a remote terminal, a remote device, a remote unit, or the like.

For example, in this disclosure, "transmit" may mean performing at least one layer of processing within the protocol stack used for transmission, or physically transmitting a signal wirelessly or by wire. It may mean sending to Alternatively, "transmitting" may mean a combination of performing the at least one layer of processing and physically transmitting the signal wirelessly or by wire. Similarly, "receive" may mean processing at least one layer in the protocol stack used for reception, or physically receiving a signal wirelessly or by wire. may mean that Alternatively, "receiving" may mean a combination of performing the at least one layer of processing and physically receiving the signal wirelessly or by wire. The at least one layer may also be translated as at least one protocol.

For example, in this disclosure, "obtain/acquire" may mean obtaining information among stored information, obtaining information among information received from other nodes. or to obtain the information by generating the information.

For example, in this disclosure, the terms "include" and "comprise" do not mean to include only the recited items, but may include only the recited items, or may include only the recited items. It means that further items may be included in addition to the

For example, in the present disclosure, "or" does not mean exclusive OR, but means logical sum.

It should be noted that the technical features included in the above-described embodiments may be expressed as the following features. Of course, the disclosure is not limited to the following features.

(Feature 1)
Validity information about results of measurements based on an uplink reference signal transmitted by a first user equipment (100) that are valid for a second user equipment (100) and said second user. an information acquisition unit (131) for acquiring user device information indicating the device;
a communication processing unit (133) for transmitting said valid information and said user equipment information on an uplink using control information;
A user equipment (100) comprising:

(Feature 2)
the uplink reference signal is a sounding reference signal (SRS);
The user equipment of feature 1.

(Feature 3)
the validity information indicates the uplink reference signal for the result of the measurement that is valid for the second user equipment;
A user equipment according to

feature

1 or 2.

(Feature 4)
the validity information indicates the uplink reference signal by directly indicating the transmission timing (13) of the uplink reference signal;
A user equipment according to feature 3.

(Feature 5)
The useful information is a system frame number, a subframe number, a slot number, a symbol number, or a combination of two or more of a system frame number, a subframe number, a slot number, and a symbol number of the uplink reference signal. indicating the transmission timing,
A user equipment according to feature 4.

(Feature 6)
The useful information is the uplink reference signal by indicating a period (21) between the transmission timing (13) of the uplink reference signal and another timing (19) for the useful information and the user equipment information. indicates a
A user equipment according to feature 3.

(Feature 7)
The validity information indicates the period (23) between the transmission timing (13) of the uplink reference signal and another timing (17) which is the transmission timing of another uplink reference signal, thereby indicating the uplink indicating a reference signal,
A user equipment according to feature 3.

(Feature 8)
The useful information indicates the period in terms of radio frames, subframes, slots, symbols, or a combination of two or more of radio frames, subframes, slots, and symbols.
User equipment according to feature 6 or 7.

(Feature 9)
the availability information includes information indicative of the first user equipment;
User equipment according to any one of the features 1-8.

(Feature 10)
said validity information comprises timing information relating to when (33) the results of said measurements are valid for said second user equipment;
User equipment according to any one of features 3-9.

(Feature 11)
the timing information indicates the timing at which the result of the measurement becomes valid;
The user equipment of feature 10.

(Feature 12)
said timing information indicates a time period (41) between said timing when the result of said measurement is valid and another timing (31) for said valid information and said user equipment information;
12. The user equipment of feature 11.

(Feature 13)
the timing information directly indicates the timing at which the results of the measurements are valid;
12. The user equipment of feature 11.

(Feature 14)
When the communication processing unit receives an RRC (Radio Resource Control) message including configuration information for transmission of the valid information and the user equipment information on the downlink, the communication processing unit configures the valid information and the user equipment according to the configuration information. send information on an uplink,
User equipment according to any one of the features 1-13.

(Feature 15)
When receiving an RRC message including configuration information for transmission of the availability information and the user equipment information on the downlink, the communication processing unit transmits the availability information and the user equipment information as a response to the RRC message. send on the uplink,
The user equipment of feature 7.

(Feature 16)
the communication processor transmits the user equipment information on an uplink after responding to the RRC message;
16. The user equipment of feature 15.

(Feature 17)
the other timing is indicated by the transmission of the user equipment information;
17. The user equipment of feature 16.

(Feature 18)
The user equipment information transmitted after responding to the RRC message is included in UCI (Uplink Control Information) or MAC CE (Media Access Control Control Element),
User equipment according to feature 16 or 17.

(Feature 19)
The communication processing unit transmits the valid information and the user equipment information on an uplink in response to receiving downlink control information including request information requesting transmission of the valid information and the user equipment information.
User equipment according to any one of the features 1-13.

(Feature 20)
the request information is an SRS request set to a value requesting transmission of the valid information and the user equipment information;
20. The user equipment of feature 19.

(Feature 21)
The communication processing unit, in response to receiving control information including request information requesting transmission of the valid information and the user device information from the second user device through direct communication, transmits the valid information and the user device information. send information on an uplink,
User equipment according to any one of the features 1-13.

(Feature 22)
the direct communication is a sidelink communication;
The control information is received via PSCCH (Physical Sidelink Control Channel) or PSSCH (Physical Sidelink Shared Channel),
22. The user equipment of feature 21.

(Feature 23)
The communication processing unit periodically transmits the valid information and the user equipment information on an uplink.
User equipment according to any one of the features 1-13.

(Feature 24)
said second user equipment is capable of transmitting or receiving data in direct communication and is capable of cooperatively transmitting said data on an uplink;
User equipment according to any one of the features 1-13.

(Feature 25)
The communication processing unit transmits the valid information and the user equipment information on an uplink in response to obtaining the data.
25. The user equipment of feature 24.

(Feature 26)
the information acquisition unit acquires the data within the user device;
26. The user equipment of feature 25.

(Feature 27)
the communication processing unit receives the data from another user device through the direct communication;
User equipment according to feature 25 or 26.

(Feature 28)
the first user equipment is capable of transmitting or receiving the data on the direct communication and cooperatively transmitting the data on an uplink;
User equipment according to any one of the features 24-27.

(Feature 29)
The information acquisition unit acquires cooperative user equipment information indicating a plurality of user equipments,
the communication processing unit transmits the cooperative user equipment information on an uplink;
wherein the plurality of user equipment is two or more second user equipment or one or more first user equipment and one or more second user equipment;
User equipment according to any one of the features 24-28.

(Feature 30)
the validity information relates to a result of the measurement that is valid for the second of the plurality of user equipments indicated by the collaborative user equipment information;
the user equipment information is indicative of the second user equipment of the plurality of user equipment;
User equipment according to feature 29.

(Feature 31)
wherein the direct communication is a sidelink communication;
User equipment according to any one of features 24-29.

(Feature 32)
the valid information is generated based on a positional relationship between the first user device and the second user device;
User equipment according to any one of the features 1-31.

(Feature 33)
wherein the user equipment is the first user equipment;
User equipment according to any one of the features 1-32.

(Feature 34)
Validity information about results of measurements based on an uplink reference signal transmitted by a first user equipment (100) that are valid for a second user equipment (100) and said second user. a communication processing unit (243) for receiving user equipment information of the equipment on an uplink using control information;
an information acquisition unit (241) for acquiring the valid information and the user equipment information from the control information;
A base station (200) comprising:

(Feature 35)
35. The base station of feature 34, wherein the communications processor transmits on the downlink an RRC message including configuration information for transmission of the availability information and the user equipment information.

(Feature 36)
the communication processing unit receives the valid information and the user equipment information on an uplink in response to the RRC message;
36. The base station of feature 35.

(Feature 37)
The communication processing unit transmits downlink control information including request information requesting transmission of the valid information and the user equipment information on the downlink.
35. The base station of feature 34.

(Feature 38)
The communication processing unit transmits resource allocation information indicating allocation of uplink resources to the second user equipment indicated by the user equipment information;
the uplink resources are allocated using results of the measurements that are valid for the second user equipment indicated by the validity information;
A base station according to any one of features 34-37.

(Feature 39)
When the communication processing unit receives cooperative user equipment information indicating a plurality of user equipments on an uplink, the communication processing unit transmits the resource allocation information to the plurality of user equipments indicated by the cooperative user equipment information;
wherein the plurality of user equipment is two or more second user equipment or one or more first user equipment and one or more second user equipment;
each of the plurality of user equipment can transmit or receive data in direct communication and can cooperatively transmit the data on the uplink;
The uplink resource is valid for each of the two or more second user equipments indicated by the availability information, or is valid for the one or more second user equipments indicated by the availability information. assigned using a result of one of the measurements and a measurement of an uplink reference signal received from the first user equipment;
The base station of feature 38.

(Feature 40)
The information acquisition unit acquires cooperative precoding,
wherein the communication processing unit transmits control information including the cooperative precoding to the plurality of user equipments;
40. The base station of feature 39.

(Feature 41)
A method performed by a user equipment (100), comprising:
Validity information about results of measurements based on an uplink reference signal transmitted by a first user equipment (100) that are valid for a second user equipment (100) and said second user. obtaining user device information indicating the device;
transmitting the valid information and the user equipment information on an uplink using control information;
Method.

(Feature 42)
A method performed by a base station (200), comprising:
Validity information about results of measurements based on an uplink reference signal transmitted by a first user equipment (100) that are valid for a second user equipment (100) and said second user. receiving user equipment information for the equipment on the uplink using the control information;
obtaining the valid information and the user equipment information from the control information;
Method.

(Feature 43)
Validity information about results of measurements based on an uplink reference signal transmitted by a first user equipment (100) that are valid for a second user equipment (100) and said second user. obtaining user device information indicative of the device;
transmitting the valid information and the user equipment information on an uplink using control information;
A program that makes a computer run

(Feature 44)
Validity information about results of measurements based on an uplink reference signal transmitted by a first user equipment (100) that are valid for a second user equipment (100) and said second user. receiving user equipment information for the equipment on the uplink using the control information;
obtaining the valid information and the user equipment information from the control information;
A program that makes a computer run

(Feature 45)
Validity information about results of measurements based on an uplink reference signal transmitted by a first user equipment (100) that are valid for a second user equipment (100) and said second user. obtaining user device information indicative of the device;
transmitting the valid information and the user equipment information on an uplink using control information;
A computer-readable non-transitional tangible recording medium in which a program for causing a computer to execute is recorded.

(Feature 46)
Validity information about results of measurements based on an uplink reference signal transmitted by a first user equipment (100) that are valid for a second user equipment (100) and said second user. receiving user equipment information for the equipment on the uplink using the control information;
obtaining the valid information and the user equipment information from the control information;
A computer-readable non-transitional tangible recording medium in which a program for causing a computer to execute is recorded.

Claims

Validity information about results of measurements based on an uplink reference signal transmitted by a first user equipment (100) that are valid for a second user equipment (100) and said second user. an information acquisition unit (131) for acquiring user device information indicating the device;
a communication processing unit (133) for transmitting said valid information and said user equipment information on an uplink using control information;
A user equipment (100) comprising:
the uplink reference signal is a sounding reference signal (SRS);
2. User equipment according to claim 1.
the validity information indicates the uplink reference signal for the result of the measurement that is valid for the second user equipment;
User equipment according to claim 1 or 2.
the validity information indicates the uplink reference signal by directly indicating the transmission timing (13) of the uplink reference signal;
4. User equipment according to claim 3.
The useful information is the uplink reference signal by indicating a period (21) between the transmission timing (13) of the uplink reference signal and another timing (19) for the useful information and the user equipment information. indicates a
4. User equipment according to claim 3.
The validity information indicates the period (23) between the transmission timing (13) of the uplink reference signal and another timing (17) which is the transmission timing of another uplink reference signal, thereby indicating the uplink indicating a reference signal,
4. User equipment according to claim 3.
the availability information includes information indicative of the first user equipment;
User equipment according to any one of claims 1-6.
said validity information comprises timing information relating to when (33) the results of said measurements are valid for said second user equipment;
A user equipment according to any one of claims 3-7.
the timing information indicates the timing at which the result of the measurement becomes valid;
9. User equipment according to claim 8.
said timing information indicates a time period (41) between said timing when the result of said measurement is valid and another timing (31) for said valid information and said user equipment information;
10. User equipment according to claim 9.
the timing information directly indicates the timing at which the results of the measurements are valid;
10. User equipment according to claim 9.
said second user equipment is capable of transmitting or receiving data in direct communication and is capable of cooperatively transmitting said data on an uplink;
User equipment according to any one of claims 1-11.
The communication processing unit transmits the valid information and the user equipment information on an uplink in response to obtaining the data.
13. User equipment according to claim 12.
The information acquisition unit acquires cooperative user equipment information indicating a plurality of user equipments,
the communication processing unit transmits the cooperative user equipment information on an uplink;
wherein the plurality of user equipment is two or more second user equipment or one or more first user equipment and one or more second user equipment;
User equipment according to claim 12 or 13.
Validity information about results of measurements based on an uplink reference signal transmitted by a first user equipment (100) that are valid for a second user equipment (100) and said second user. a communication processing unit (243) for receiving user equipment information of the equipment on an uplink using control information;
an information acquisition unit (241) for acquiring the valid information and the user equipment information from the control information;
A base station (200) comprising: