JP7197286B2 - Terminal device and wireless communication method - Google Patents

Description

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

In order to realize sophistication of ITS (Intelligent Transport Systems) services such as automatic driving and traffic accident prevention, utilization of V2X (Vehicle to everything) communication is being studied (see, for example, Non-Patent Document 1).

Hanbyul Seo, Ki-Dong Lee, Shinpei Yasukawa, Ying Peng, Philippe Sartori, “LTE evolution for vehicle-to-everything services,” IEEE Communication Magazine, vol. 54, no. 6, pp. 22-28, June 2016.

In V2X communication, the introduction of a new communication method is under consideration. For example, examples of communication systems used for V2X communication include wireless LANs such as IEEE802.11p, LTE (Long Term Evolution), or cellular networks such as 5G (5th generation mobile communication system). In addition, D2D (device to device) communication that enables direct communication (sidelink communication) between terminal devices can be cited as a base technology used for V2X communication.

For P (Pedestrian)-UE that performs sidelink communication, for example, a terminal device driven by a battery such as a smart phone may be used. Since terminal devices such as smart phones are used for, for example, telephone calls, the Internet, video playback, etc., in addition to sidelink communication, it is important to suppress power consumption.

An object of one aspect of the present invention is to suppress power consumption of a terminal device that performs inter-device communication.

The terminal device of the present invention suppresses or stops transmission of signals from the communication unit based on information about a communication unit that performs inter-device communication and other terminal devices that perform inter-device communication around the terminal device. Here, the information has a control unit obtained from an external communication device.

A wireless communication method for a terminal device according to the present invention obtains from an external communication device information about other terminal devices that perform inter-device communication in the vicinity of the terminal device, and suppresses transmission of inter-device communication signals based on the information. or stop.

According to one aspect of the present invention, power consumption of a terminal device that performs inter-device communication can be suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS It is the figure which showed the structural example of the V2X communication system which concerns on embodiment of this invention. 2 is a block diagram showing a configuration example of P-UE; FIG. 1 is a block diagram showing a configuration example of a radio base station; FIG. 2 is a block diagram showing a configuration example of an ITS server; FIG. FIG. 4 is a sequence diagram showing an operation example of the V2X communication system; 1 is a diagram showing an example of hardware configurations of a P-UE, a radio base station, and an ITS server according to an embodiment; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing a configuration example of a V2X communication system according to an embodiment of the present invention. Vehicles 1a and 1b, RSU 2, P-UE 3, radio base station 4, core network device 5, and ITS server 6 are shown in FIG.

Each of the vehicles 1a and 1b has a V (Vehicle)-UE (not shown). The V-UE mounted on each of the vehicles 1a and 1b performs wireless communication (V2V (Vehicle-to-Vehicle) communication) without going through the wireless base station 4, as indicated by the arrow A1 in FIG. .

The V-UE mounted on each of the vehicles 1a and 1b communicates wirelessly with the RSU 2 without going through the wireless base station 4 (V2I (Vehicle-to-Infrastructure) communication).

The V-UE mounted on each of the vehicles 1a and 1b wirelessly communicates (V2P (Vehicle-to-Pedestrian) communication).

The V-UE mounted on each of the vehicles 1a and 1b performs UL (UpLink) and DL (DownLink) radio communication with the radio base station 4, as indicated by the dotted arrow A4 in FIG. The RSU 2 performs UL and DL wireless communication with the wireless base station 4, as indicated by the dotted arrow A5 in FIG. The P-UE 3 performs UL and DL wireless communication with the wireless base station 4, as indicated by the dotted arrow A6 in FIG.

A radio base station 4 is connected to a core network device 5 . Core network device 5 is connected to ITS server 6 . V-UE, RSU 2, and P-UE 3 mounted on vehicles 1a and 1b communicate with core network device 5 and ITS server 6 via radio base station 4, respectively.

As the P-UE 3, for example, a battery-driven terminal device such as a smart phone may be used. Since a terminal device such as a smart phone executes various applications in addition to sidelink communication, it is important to suppress the power consumption of the battery.

Therefore, P-UE3, in the surroundings of P-UE3, other UEs that perform sidelink communication (for example, V-UE and RSU2 mounted on vehicles 1a and 1b in FIG. 1) information (hereinafter referred to as assist information ) is received from the ITS server 6 . Then, based on the assist information received from the ITS server 6, the P-UE 3 suppresses (for example, reduces the frequency of transmission; the same shall apply hereinafter) or stops the transmission of the sidelink communication signal.

For example, the assist information transmitted from the ITS server 6 to the P-UE 3 includes the number of V2X communication terminals existing around the P-UE 3. When the number of V2X communication terminals included in the assist information is equal to or less than a predetermined threshold, the P-UE 3 suppresses or stops transmission of sidelink communication signals. In other words, when the number of V2X communication terminals around P-UE3 is small, P-UE3 suppresses or stops transmission of sidelink communication signals. By this processing, the P-UE 3 suppresses the power consumption of the battery.

On the other hand, when the number of V2X communication terminals included in the assist information exceeds a predetermined threshold, the P-UE 3 does not suppress or stop transmission of sidelink communication signals. In other words, P-UE3 does not suppress or stop transmission of sidelink communication signals (continue transmission frequency) when there are many V2X communication terminals around P-UE3. Through this processing, the P-UE 3 performs sidelink communication with the surrounding V2X communication terminals without suppressing or stopping signal transmission, thereby reducing the occurrence of traffic accidents, for example.

Note that wireless communication indicated by arrows A1, A2a, A2b, A3a, and A3b in FIG. 1 may be called D2D communication (sidelink)-based V2X communication. Also, wireless communication via the wireless base station 4 between the V-UE mounted on the vehicles 1a and 1b and the RSU 2 or P-UE 3 is called cellular communication (UL/DL)-based V2X communication. good too.

FIG. 2 is a block diagram showing a configuration example of P-UE3. As shown in FIG. 2, the P-UE 3 has an SL (SideLink) communication unit 11, a communication unit 12, and a control unit 13.

The SL communication unit 11 performs sidelink communication with other UEs. For example, the SL communication unit 11 performs sidelink communication with the V-UE and RSU 2 mounted on the vehicles 1a and 1b shown in FIG.

The communication unit 12 performs UL and DL wireless communication with the wireless base station 4 .

The control unit 13 has a terminal information transmission unit 13a, an assist information reception unit 13b, and an SL communication control unit 13c.

Terminal information transmitting section 13 a transmits the terminal information of P-UE 3 to radio base station 4 via communication section 12 . The terminal information includes, for example, information indicating that the P-UE3 is a V2X communication terminal and information identifying the P-UE3.

Note that other V2X communication terminals (eg, V-UE and RSU 2 mounted on vehicles 1a and 1b) also transmit terminal information to radio base station 4. FIG. As will be described below, the radio base station 4 detects that the V2X communication terminal is located within the cell (radio area) of the radio base station 4 in response to receiving terminal information transmitted from the V2X communication terminal. do.

The assist information receiving unit 13 b receives assist information transmitted from the ITS server 6 . The assist information may include, for example, information on the number of other V2X communication terminals existing within a circle with a predetermined radius centered on the P-UE3. Also, the assist information may include, for example, information on the positions of other V2X communication terminals existing within a circle with a predetermined radius centered on the P-UE3.

The SL communication control unit 13c suppresses or stops transmission of the signal of the SL communication unit 11 based on the assist information received by the assist information receiving unit 13b.

For example, the SL communication control unit 13c determines that the number of V-UEs existing around the P-UE 3 (for example, in a circle with a predetermined radius centered on the P-UE 3) included in the received assist information is a predetermined number. If it is equal to or less than the threshold, the transmission of the sidelink communication signal is suppressed or stopped. On the other hand, when the number of V-UEs existing around the P-UE 3 included in the received assist information exceeds a predetermined threshold, the SL communication control unit 13c suppresses the transmission of sidelink communication signals. or do not stop.

FIG. 3 is a block diagram showing a configuration example of the radio base station 4. As shown in FIG. As shown in FIG. 3 , the radio base station 4 has a radio communication section 21 , a communication section 22 and a control section 23 .

The wireless communication unit 21 performs wireless communication with a terminal device according to a cellular communication system such as 5G, for example. A terminal device may include, for example, a user terminal such as a V-UE, P-UE, RSU, or smart phone.

The communication unit 22 communicates with the ITS server 6 .

The control unit 23 has a terminal positioning unit 23a. The terminal positioning unit 23a detects that the V2X communication terminal is located within the cell of the radio base station 4 in response to receiving the terminal information transmitted from the V2X communication terminal. When the terminal positioning unit 23a detects that the V2X communication terminal is located in the cell of the radio base station 4, the terminal positioning unit 23a transmits the received terminal information of the V2X communication terminal and the location information of the V2X communication terminal via the communication unit 22. and transmits it to the ITS server 6. The location information may include the cell ID of the radio base station 4, for example.

FIG. 4 is a block diagram showing a configuration example of the ITS server 6. As shown in FIG. As shown in FIG. 4 , the ITS server 6 has a communication section 31 , a control section 32 and a storage section 33 . The communication unit 31 communicates with the radio base station 4 .

The storage unit 33 stores the location information of the V2X communication terminal transmitted from the radio base station 4 and the terminal information of the V2X communication terminal in association with each other. When the terminal information of the V2X communication terminal is already stored in the storage unit 33, the location information of the V2X communication terminal transmitted from the radio base station 4 is updated. In other words, the storage unit 33 collects the latest location information of the V2X communication terminals.

The controller 32 has an assist information generator 32a. The assist information generating unit 32a refers to the storage unit 33 and generates assist information for the P-UE3.

For example, when P-UE 3 performs UL communication with radio base station 4 , radio base station 4 transmits location information and terminal information of P-UE 3 to ITS server 6 .

The assist information generation unit 32a of the ITS server 6 refers to the storage unit 33 based on the position information of the P-UE 3 transmitted from the radio base station 4, and detects other V2X communication terminals existing around the P-UE 3. do. The assist information generator 32a can detect other V2X communication terminals existing around the P-UE 3, for example, in cell units of the radio base station.

When the assist information generating unit 32a detects other V2X communication terminals existing around the P-UE 3, for example, assist information including the number of detected V2X communication terminals or the position of the detected V2X communication terminal (eg, cell ID) Generate information. The assist information generation unit 32 a transmits the generated assist information to the radio base station 4 via the communication unit 31 . The radio base station 4 transmits the assistance information received from the ITS server 6 to the P-UE3.

FIG. 5 is a sequence diagram showing an operation example of the V2X communication system. P-UE 3 performs UL communication with radio base station 4 (step S1). P-UE 3 may perform V2XUL communication with radio base station 4 .

When the radio base station 4 performs UL communication with the P-UE 3 in step S1, the location information of the P-UE 3 (for example, the cell ID of the radio base station 4) and the terminal information of the P-UE 3 are sent to the ITS server 6. (step S2).

The ITS server 6 detects V2X communication terminals existing around the P-UE 3 based on the location information of the P-UE 3 transmitted from the radio base station 4, and generates assist information for the P-UE 3 (step S3 ). The ITS server 6 also stores the location information and terminal information of the P-UE 3 transmitted from the radio base station 4 in the storage unit 33 (step S3).

The ITS server 6 transmits the assist information generated in step S3 to the radio base station 4 (step S4).

The radio base station 4 transmits the assist information transmitted from the ITS server 6 to the P-UE 3 that performed the UL communication in step S1 (step S5).

The P-UE 3 controls the sidelink communication transmission operation based on the assist information transmitted from the radio base station 5 (step S6).

For example, when the number of V2X communication terminals existing around the P-UE 3 included in the assist information is equal to or less than a predetermined threshold, the P-UE 3 suppresses or stops transmission of sidelink communication signals. On the other hand, when the number of V-UEs existing around the P-UE 3 included in the assist information exceeds a predetermined threshold value, the SL communication control unit 13c does not suppress or stop transmission of sidelink communication signals.

Note that the radio base station 4 also transmits the location information and terminal information of the V2X communication terminal to the ITS server 6 when a V2X communication terminal other than the P-UE 3 performs UL communication. The location information and terminal information transmitted to the ITS server 6 are stored in the storage unit 33 . Through this process, the storage unit 33 stores (collects) the terminal information and location information of the V2X communication terminal.

<Operation example of V2X communication system>
An operation example of the V2X communication system according to the embodiment will be described. The operation of the V2X communication system is divided into, for example, the following three stages ST1 to ST3.

・ST1: Understanding (collecting) location information of V2X communication terminals.
• ST2: Notification of assist information to P-UE3.
• ST3: Determining transmission operation of P-UE3.

(Details of ST1)
The V2X communication system may grasp the position of the V2X communication terminal based on, for example, the following method.

・Method 1
When the V2X communication terminal performs UL communication, even if the wireless base station 4 to which the V2X communication terminal is connected notifies the ITS server 6 that the V2X communication terminal exists in the cell of the wireless base station 4 good. Based on the information notified from the radio base station 4, the ITS server 6 can collect the positions of the V2X communication terminals, for example, in cell units of the radio base station.

Note that the V2X communication terminal includes terminal information indicating that it is a V2X communication terminal in the UL control information. Based on the terminal information included in the UL control information, the radio base station 4 can determine whether a terminal device located in the cell of the radio base station 4 is a V2X communication terminal.

・Method 2
The V2X communication terminal may notify the ITS server 6 of the location information and terminal information of the V2X communication terminal when executing the RRC-connection. The ITS server 6 associates the terminal information and the location information notified from the V2X communication terminal, and stores them in the storage unit 33, for example.

・Method 3
When a V2X communication terminal transmits a packet including a V2X message to the ITS server 6 using UL, the ITS server 6 may decode the packet to obtain the location information of the V2X communication terminal. The V2X message may include location information of the V2X communication terminal.

In addition, the ITS server 6 accesses the indoor cell database (server) in each of the above methods, and the V2X communication terminal is located in an IMCS (Inbuilding Mobile Communication System), an underpass cell, a subway cell, a femtocell, or the like. You can understand that.

Also, the ITS server 6 may determine whether the V2X communication terminal is located indoors based on the cell ID. For example, the ITS server 6 may determine that the V2X communication terminal is located indoors when the cell ID to which the V2X communication terminal connects is stored in a pre-registered indoor cell database (server). . Then, the ITS server 6 may include information indicating whether or not the V2X communication terminal is located indoors in the assist information.

Also, the radio base stations connected via the backhaul may share the location information of the V2X communication terminal.

(Details of ST2)
The ITS server 6 may notify the P-UE 3 of assist information using DL communication via the radio base station 4 .

Also, the ITS server 6 may notify the P-UE 3 of the assist information via the V2X communication terminal that wirelessly communicates with the wireless base station 4 . For example, a V2X communication terminal that wirelessly communicates with the wireless base station 4 receives assist information for the P-UE 3 from the ITS server 6 via the wireless base station 4, and transmits the received assist information using sidelink communication. , P-UE3.

The assist information may include the number of V2X communication terminals existing in the same cell as P-UE3. Also, the assist information may include the number of V2X communication terminals existing in cells near the cell in which the P-UE 3 is located. Also, the assist information may include information indicating that the P-UE 3 is located indoors. Also, the number of V2X communication terminals included in the assist information may be limited to the number of V-UEs.

(Details of ST3)
Based on the assist information notified from the ITS server 6, the P-UE 3 may stop transmitting sidelink communication signals, or may change the number of transmissions and the transmission cycle.

For example, P-UE3 may stop transmission of sidelink communication when the number of V2X communication terminals existing around P-UE3 is equal to or less than a predetermined threshold. On the other hand, when the number of V2X communication terminals existing around the P-UE3 exceeds a predetermined threshold, the P-UE3 does not have to change the transmission cycle of the sidelink communication signal, or changes it to a short cycle. may

Note that the P-UE 3 may stop transmission of the UL communication based on the assist information notified from the ITS server 6, or may change the number of times of transmission and the transmission cycle. For example, P-UE3 may stop UL communication when the number of V2X communication terminals existing around P-UE3 exceeds a predetermined threshold.

Also, the P-UE 3 may change the sensing range or the resource range (resource pool) for receiving signals based on the assist information notified from the ITS server 6 . For example, when the number of V2X communication terminals present in the vicinity is equal to or less than a predetermined threshold, the P-UE 3 may change the range of resources for sensing or receiving signals to be smaller.

Also, the P-UE 3 may change the sensing cycle. For example, the P-UE 3 may change the sensing cycle to a long cycle when the number of V2X communication terminals existing in the vicinity is equal to or less than a predetermined threshold.

Also, when the P-UE 3 receives the assist information indicating that it is located indoors, the P-UE 3 may suppress or stop transmission of sidelink communication signals. This is because, when the P-UE 3 is located indoors, the possibility of being involved in a traffic accident, for example, is low.

As described above, the P-UE 3 acquires from the ITS server 6 the assist information regarding the SL communication unit 11 that performs sidelink communication and other V2X communication terminals that perform sidelink communication around the P-UE 3, and a control unit 13 that suppresses or stops transmission of the signal of the SL communication unit 11 based on the acquired assist information. This allows the P-UE 3 to reduce power consumption. For example, when there is no V2X communication terminal performing sidelink communication in the vicinity, the P-UE 3 suppresses or stops transmission of sidelink communication signals, thereby reducing power consumption.

Although the ITS server 6 stores the position information of the V2X communication terminal and generates the assist information in the above description, the present invention is not limited to this. Another server may store location information of the V2X communication terminal and generate assist information.

Also, the ITS server 6 may include identification information of V2X communication terminals existing around the P-UE 3 in the assist information. The P-UE 3 may suppress or stop transmission of sidelink communication signals, for example, based on the number of identification information included in the received assist information.

Also, the radio base station 4 may transmit, for example, information on the time taken to transmit and receive radio signals with the V2X communication terminal and information on the beam direction of the radio signal to the ITS server 6 . Then, the ITS server 6 may calculate the distance of the V2X communication terminal from the wireless base station 4 and the direction in which the V2X communication terminal is positioned with the wireless base station 4 as the starting point, and store them in the storage unit 33 . The ITS server 6 identifies V2X communication terminals existing around the P-UE 3 based on the distance of the V2X communication terminal from the radio base station 4 and the direction in which the V2X communication terminal is positioned with the radio base station 4 as the starting point. The number of detected V2X communication terminals may be included in the assist information.

Also, the function of suppressing or stopping the transmission of sidelink communication signals may be turned on and off by setting.

Also, in the above description, the P-UE 3 controls the transmission of sidelink communication signals, but alternatively or additionally, the P-UE 3 may control the reception. For example, the P-UE 3 may suppress or stop receiving sidelink communication signals based on the assist information in the same manner as sidelink communication transmission.

Also, the P-UE 3 may have the function of stopping the transmission of the sidelink communication signal, and may not have the function of suppressing it. Also, the P-UE 3 may have a function of suppressing the transmission of the sidelink communication signal and may not have a function of stopping it. Also, the P-UE 3 may have a function of suppressing and stopping the transmission of sidelink communication signals.

The embodiments of the present invention have been described above.

(Hardware configuration)
It should be noted that the block diagrams used in the description of the above embodiments show blocks in units of functions. These functional blocks (components) are implemented by any combination of hardware and/or software. Further, means for realizing each functional block is not particularly limited. That is, each functional block may be implemented by one device physically and/or logically coupled, or may be implemented by two or more physically and/or logically separated devices directly and/or indirectly. These multiple devices may be connected together (eg, wired and/or wirelessly).

For example, the P-UE 3, radio base station 4, and ITS server 6 in one embodiment of the present invention may function as a computer that processes the radio communication method of the present invention. FIG. 6 is a diagram showing an example of hardware configurations of P-UE 3, radio base station 4, and ITS server 6 according to the embodiment. The above P-UE 3, radio base station 4, and ITS server 6 are physically computer devices including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. may be configured as

Note that in the following description, the term "apparatus" can be read as a circuit, device, unit, or the like. The hardware configuration of the P-UE 3, radio base station 4, and ITS server 6 may be configured to include one or more of each device shown in the figure, or may be configured without some devices. may

For example, although only one processor 1001 is shown, there may be multiple processors. Also, processing may be performed by one processor, or processing may be performed concurrently, serially, or otherwise by one or more processors. Note that processor 1001 may be implemented by one or more chips.

Each function of the P-UE 3, the radio base station 4, and the ITS server 6 is performed by the processor 1001 by loading predetermined software (program) onto hardware such as the processor 1001 and the memory 1002, and the communication apparatus 1004 or by controlling reading and/or writing of data in the memory 1002 and storage 1003 .

The processor 1001, for example, operates an operating system to control the entire computer. The processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, registers, and the like. For example, the control units 13 , 23 , 32 and the like described above may be realized by the processor 1001 .

The processor 1001 also reads programs (program codes), software modules, or data from the storage 1003 and/or the communication device 1004 to the memory 1002, and executes various processes according to them. As the program, a program that causes a computer to execute at least part of the operations described in the above embodiments is used. Although it has been described that the above-described various processes are executed by one processor 1001, they may be executed by two or more processors 1001 simultaneously or sequentially. Processor 1001 may be implemented with one or more chips. Note that the program may be transmitted from a network via an electric communication line.

The memory 1002 is a computer-readable recording medium, and is composed of at least one of, for example, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), and RAM (Random Access Memory). may be The memory 1002 may also be called a register, cache, main memory (main storage device), or the like. The memory 1002 can store executable programs (program codes), software modules, etc. for implementing a wireless communication method according to an embodiment of the present invention.

The storage 1003 is a computer-readable recording medium, for example, an optical disc such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disc, a magneto-optical disc (for example, a compact disc, a digital versatile disc, a Blu-ray disk), smart card, flash memory (eg, card, stick, key drive), floppy disk, magnetic strip, and/or the like. Storage 1003 may also be called an auxiliary storage device. The storage medium described above may be, for example, a database, server, or other suitable medium including memory 1002 and/or storage 1003 . For example, the storage unit 33 described above may be implemented by the memory 1002 and/or the storage 1003 .

The communication device 1004 is hardware (transmitting/receiving device) for communicating between computers via a wired and/or wireless network, and is also called a network device, network controller, network card, communication module, or the like. For example, the SL communication unit 11, the communication units 12, 22, 31, the wireless communication unit 21, and the like described above may be realized by the communication device 1004. FIG.

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

Devices such as the processor 1001 and the memory 1002 are also connected by a bus 1007 for communicating information. The bus 1007 may be composed of a single bus, or may be composed of different buses between devices.

In addition, the P-UE 3, the radio base station 4, and the ITS server 6 include microprocessors, digital signal processors (DSPs), ASICs (Application Specific Integrated Circuits), PLDs (Programmable Logic Devices), FPGAs (Field Programmable Gate Array), etc., and part or all of each functional block may be realized by the hardware. For example, processor 1001 may be implemented with at least one of these hardware.

(Notification of information, signaling)
Also, the notification of information is not limited to the aspects/embodiments described herein, and may be performed in other ways. For example, notification of information includes physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), higher layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, It may be implemented by broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof. RRC signaling may also be called an RRC message, and may be, for example, an RRC connection setup message, an RRC connection reconfiguration message, or the like.

(adaptive system)
Aspects/embodiments described herein support Long Term Evolution (LTE), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G, 5G, Future Radio Access (FRA), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, UWB (Ultra-WideBand), It may be applied to systems utilizing Bluetooth®, other suitable systems, and/or advanced next generation systems based thereon.

(Processing procedure, etc.)
The procedures, sequences, flow charts, etc. of each aspect/embodiment described herein may be interchanged so long as there is no inconsistency. For example, the methods described herein present elements of the various steps in a sample order, and are not limited to the specific order presented.

(Base station operation)
A specific operation performed by a base station (radio base station) in this specification may be performed by its upper node in some cases. In a network consisting of one or more network nodes with a base station, various operations performed for communication with terminals may be performed by the base station and/or other network nodes other than the base station (e.g., Obviously, it can be performed by MME (Mobility Management Entity) or S-GW (Serving Gateway), etc., but not limited to these). Although the case where there is one network node other than the base station is exemplified above, it may be a combination of a plurality of other network nodes (for example, MME and S-GW).

(input/output direction)
Information, signals, etc. may be output from higher layers (or lower layers) to lower layers (or higher layers). It may be input and output via multiple network nodes.

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

(Determination method)
The determination may be made by a value represented by one bit (0 or 1), by a true/false value (Boolean: true or false), or by numerical comparison (for example, a predetermined value).

(software)
Software, whether referred to as software, firmware, middleware, microcode, hardware description language or otherwise, includes instructions, instruction sets, code, code segments, program code, programs, subprograms, and software modules. , applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, and the like.

Software, instructions, etc. may also be sent and received over a transmission medium. For example, the software can be used to access websites, servers, or other When transmitted from a remote source, these wired and/or wireless technologies are included within the definition of transmission media.

(information, signal)
Information, signals, etc. described herein may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may refer to voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. may be represented by a combination of

The terms explained in this specification and/or terms necessary for understanding this specification may be replaced with terms having the same or similar meanings. For example, channels and/or symbols may be signals. A signal may also be a message. A component carrier (CC) may also be referred to as a carrier frequency, cell, and so on.

("system", "network")
As used herein, the terms "system" and "network" are used interchangeably.

(parameter, channel name)
In addition, the information, parameters, etc. described in this specification may be represented by absolute values, may be represented by relative values from a predetermined value, or may be represented by corresponding other information. . For example, radio resources may be indexed.

(base station)
A base station (radio base station) can serve one or more (eg, three) cells (also called sectors). When a base station accommodates multiple cells, the overall coverage area of the base station can be partitioned into multiple smaller areas, each smaller area being a base station subsystem (for example, a small indoor base station RRH: Remote Radio Head) may also provide communication services. The terms "cell" or "sector" refer to part or all of the coverage area of a base station and/or base station subsystem that serves communication within this coverage. Further, the terms "base station,""eNB,""gNB,""cell," and "sector" may be used interchangeably herein. A base station may also be referred to by terms such as fixed station, NodeB, eNodeB (eNB), gNodeB (gNB) access point, femtocell, small cell, and so on.

(terminal)
Terminal equipment is defined by those skilled in the art as mobile station, subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile It may also be called a terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, user terminal, UE or some other suitable terminology.

(Term meaning and interpretation)
As used herein, the terms "determining" and "determining" may encompass a wide variety of actions. "Judgement", "determining" are, for example, judging, calculating, computing, processing, deriving, investigating, looking up (e.g., table , searching in a database or other data structure), regarding ascertaining as "determining" or "determining". Also, "judgment" and "determination" are used for receiving (e.g., receiving information), transmitting (e.g., transmitting information), input, output, access (accessing) (for example, accessing data in memory) may include deeming that a "judgment" or "decision" has been made. In addition, "judgment" and "decision" are considered to be "judgment" and "decision" by resolving, selecting, choosing, establishing, comparing, etc. can contain. In other words, "judgment" and "decision" may include considering that some action is "judgment" and "decision".

The terms "connected", "coupled", or any variation thereof, mean any direct or indirect connection or coupling between two or more elements, It can include the presence of one or more intermediate elements between two elements being "connected" or "coupled." Couplings or connections between elements may be physical, logical, or a combination thereof. As used herein, two elements are referred to by the use of one or more wires, cables and/or printed electrical connections and, as some non-limiting and non-exhaustive examples, radio frequency They can be considered to be “connected” or “coupled” to each other through the use of electromagnetic energy, such as electromagnetic energy having wavelengths in the microwave, light (both visible and invisible) regions.

As used herein, the phrase "based on" does not mean "based only on," unless expressly specified otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

The "unit" in the configuration of each device described above may be replaced with "means", "circuit", "device", or the like.

To the extent that "including," "comprising," and variations thereof are used herein or in the claims, these terms, as well as the term "comprising," are inclusive. intended to be Furthermore, the term "or" as used in this specification or the claims is not intended to be an exclusive OR.

Throughout this disclosure, where articles have been added by translation, e.g., a, an, and the in English, these articles are used unless the context clearly indicates otherwise. It shall include plural things.

(Variation of mode, etc.)
Each aspect/embodiment described herein may be used alone, in combination, or switched between implementations. Further, notification of predetermined information (e.g., notification of "being X") is not limited to being performed explicitly, and may be performed implicitly (e.g., not notifying the predetermined information). good.

Although the present invention has been described in detail above, it will be apparent to those skilled in the art that the present invention is not limited to the embodiments described herein. The present invention can be implemented with modifications and variations without departing from the spirit and scope of the invention defined by the claims. Accordingly, the descriptions herein are for the purpose of illustration and description, and are not intended to have any limiting meaning with respect to the present invention.

1a, 1b vehicle 2 RSU
3 P-UE
4 wireless base station 5 core network device 6 ITS server 11 SL communication unit 12, 22, 31 communication unit 13, 23, 32 control unit 13a terminal information transmission unit 13b assist information reception unit 13c SL communication control unit 21 wireless communication unit 23a terminal Positioning unit 32a Assist information generation unit 33 Storage unit

Claims (6)

A terminal device,
a communication unit that performs inter-device communication;
Suppressing or stopping transmission of signals from the communication unit based on information about other terminal devices that perform inter-device communication in the vicinity of the terminal device;
wherein the information is obtained from an external communication device;
a control unit ;
The information includes the number of the other terminal devices existing around the terminal device,
The control unit suppresses or stops transmission of signals from the communication unit when the number of the other terminal devices is equal to or less than a predetermined threshold,
Terminal equipment. A terminal device,
a communication unit that performs inter-device communication;
Suppressing or stopping transmission of signals from the communication unit based on information about other terminal devices that perform inter-device communication in the vicinity of the terminal device;
wherein the information is obtained from an external communication device;
a control unit;
the information includes the number of the other terminal devices located in the wireless area where the terminal device is located or in a wireless area near the wireless area;
The control unit suppresses or stops transmission of signals from the communication unit when the number of the other terminal devices is equal to or less than a predetermined threshold ,
Terminal equipment. The information includes information indicating whether the terminal device is located indoors,
The control unit suppresses or stops transmission of signals from the communication unit when the terminal device is located indoors.
The terminal device according to claim 1 or 2 . The control unit changes a range of sensing for inter-device communication or a range of resources for receiving signals, based on the information.
The terminal device according to any one of claims 1 to 3 . A wireless communication method for a terminal device,
Acquiring from an external communication device information about other terminal devices that perform inter-device communication in the vicinity of the terminal device;
Suppressing or stopping transmission of inter-device communication signals based on the information;
The information includes the number of the other terminal devices existing around the terminal device,
suppressing or stopping transmission of the signal when the number of the other terminal devices is less than or equal to a predetermined threshold;
wireless communication method. A wireless communication method for a terminal device,
Acquiring from an external communication device information about other terminal devices that perform inter-device communication in the vicinity of the terminal device;
Suppressing or stopping transmission of inter-device communication signals based on the information;
the information includes the number of the other terminal devices located in the wireless area where the terminal device is located or in a wireless area near the wireless area;
suppressing or stopping transmission of the signal when the number of the other terminal devices is less than or equal to a predetermined threshold;
wireless communication method.

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