JP6890152B2 - Servers, communication terminals, mobiles, communication systems, methods and programs for providing information - Google Patents

Description

The present invention relates to a communication terminal device used for communication between short-range devices, a mobile body and a communication system provided with the communication terminal device, and a server, a method and a program for providing information to the communication terminal device.

Conventionally, between short-range devices (D2D: Device-to-) such as V2V (Vehicle-to-Vehicle), V2I (Vehicle-to-Infrastructure), V2P (Vehicle-to-Pedestrian), V2X (Vehicle-to-Everything) A communication method for direct wireless communication with Device) is known.

For example, in the LTE (Long Term Evolution) and next-generation (NR) specifications of 3GPP (3rd Generation Partnership Project), short-range devices such as V2V, V2I, V2P, and V2X do not go through the mobile communication network (core network). Standard specifications for a Sidelink communication system (hereinafter referred to as "PC5 communication system") for direct wireless communication using an interface called PC5 between (D2D) have been established (see Non-Patent Documents 1, 2, 3, and 4). .. Further, in Non-Patent Document 5, as a wireless characteristic of the PC5 communication method, the communication distance in a non-line-of-sight (NLOS: Non Line Of Sight) environment is less than half of the communication distance in a line-of-sight (LOS: Line Of Sight) environment. The evaluation results are described (see, for example, FIGS. 41 and 49).

3GPP TS 23.285 V16.0.0 (2019-03), 3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; Architecture enhancements for V2X services (Release 16) 3GPP TS 23.303 V15.1.0 (2018-06), 3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; Proximity-based services (ProSe); Stage 2 (Release 15) 3GPP TS 24.386 V15.2.0 (2018-12), 3rd Generation Partnership Project; Technical Specification Group Core Network and Terminals; User Equipment (UE) to V2X control function; protocol aspects; Stage 3 (Release 15) 3GPP TR 38.885 V16.0.0 (2019-03), 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; NR; Study on NR Vehicle-to-Everything (V2X) (Release 16) 5GAA (Automotive Association), "V2X Functional and Performance Test Report; Test Procedures and Results", [online], October 24, 26, 2018, [Search on May 24, 1st year of Reiwa], Internet <URL: http://5gaa.org/wp-content/uploads/2018/11/P-180106-V2X-Functional-and-Performance-Test-Report_Final_051118.pdf ＞

In the direct wireless communication system between short-range devices such as the conventional PC5 communication system, the wireless communication distance changes depending on the surrounding environment (for example, NLOS, LOS) as described above, and the communication terminal device located at a certain point is used. When performing direct wireless communication for transmission, there is a problem that it is difficult to specify a communicable range from the communication terminal device.

The server according to one aspect of the present invention is a server that provides information. This server is a storage means for storing communication range-related information regarding a range in which communication by the direct wireless communication method of the communication terminal device is possible for each of a plurality of different management areas constituting a target area to which the communication terminal device can move. And an information transmission means for transmitting the communication range-related information corresponding to the management area in which the communication terminal device is located to the communication terminal device.
The server further includes an information request receiving means for receiving an information request requesting the communication range-related information for the management area from a communication terminal device located in the management area, and the information transmitting means is provided from the communication terminal device. In response to the received information request, the communication range-related information corresponding to the management area in which the communication terminal device is located may be transmitted to the communication terminal device. Here, the information request may include information on the current position of the communication terminal device that has transmitted the information request.
In the server, the communication range-related information includes propagation loss information regarding the distribution of propagation loss of radio waves transmitted from a communication terminal device located in the management area, and communication possible regarding a distance at which the radio waves can be received with a predetermined received power. At least one of distance information, communicable area information regarding another management area that can receive the radio wave with a predetermined reception power, and non-communicable area information about another management area that cannot receive the radio wave with a predetermined reception power. Information may be included.
In the server, information including the current position of the communication terminal device on the transmitting side, the transmission power, and the communication identifier is received from the communication terminal device on the transmitting side that has transmitted data by the direct wireless communication method, and the direct wireless communication is performed. An information receiving means for receiving information including the current position and reception power of the receiving side communication terminal device and the communication identifier of the transmitting side communication terminal device from the receiving side communication terminal device that has received data by the method. An information processing means for determining the communication range-related information based on the information received from each of the transmitting side communication terminal device and the receiving side communication terminal device may be provided.

The communication terminal device according to another aspect of the present invention is a communication terminal device capable of communicating by a direct wireless communication method. This communication terminal device is a server that manages communication range-related information regarding a range in which communication by the direct wireless communication method of the communication terminal device is possible for each of a plurality of different management areas constituting a target area in which the communication terminal device can move. Therefore, the information acquisition means for acquiring the communication range-related information corresponding to the management area in which the communication terminal device is located is provided from the server.
In the communication terminal device, the information acquisition means may transmit an information request requesting the communication range-related information for the management area where the communication terminal device is located to the server.
In the communication terminal device, the data obtained by adding a communication identifier corresponding to a specific management area selected from a plurality of different management areas constituting a target area to which the communication terminal device can move as a communication destination communication identifier is added. Information including a data transmission means to be transmitted by a direct wireless communication method, a current position of the communication terminal device, a transmission power of the data, and a communication identifier corresponding to a management area in which the communication terminal device is located is transmitted to the server. It may be provided with a means for transmitting information.
In the communication terminal device, the data receiving means for receiving the data obtained by adding the communication identifier corresponding to the management area in which the communication terminal device is located as the communication identifier of the communication destination by the direct wireless communication method, and the communication terminal device. Information transmission means for transmitting information including the current position, the received power of the data, and the communication identifier of the transmitting side added to the data to the server may be provided.
In the communication terminal device, it is determined that the communication distance that can be communicated from the current position of the communication terminal device is equal to or less than a predetermined first threshold value based on the communication range-related information corresponding to the management area in which the communication terminal device is located. When, communication with the communication terminal device of the transmission destination by the direct wireless communication method is performed by multi-hop communication with the communication terminal device of the transmission destination via one or more other communication terminal devices by the direct wireless communication method. A communication control means for switching to at least one communication of Uu communication with the communication terminal device of the transmission destination via the mobile communication network may be further provided.
In the communication terminal device, it is determined that the communication distance that can be communicated from the current position of the communication terminal device is equal to or more than a predetermined second threshold value based on the communication range-related information corresponding to the management area in which the communication terminal device is located. At the time, a communication control means for suppressing the transmission power by the direct wireless communication method may be further provided.

The mobile body according to still another aspect of the present invention includes any of the above-mentioned communication terminal devices.

A communication system according to still another aspect of the present invention includes any of the above servers and any of the above communication terminal devices.

A method according to yet another aspect of the present invention is a method of providing information. This method is to store communication range-related information regarding a range in which communication by the direct wireless communication method of the communication terminal device is possible for each of a plurality of different management areas constituting a target area in which the communication terminal device can move. The communication range-related information corresponding to the management area in which the communication terminal device is located is transmitted to the communication terminal device.

A program according to still another aspect of the present invention is a program executed by a computer or processor provided in a server that provides information. This program is for storing communication range-related information regarding a range in which communication by the direct wireless communication method of the communication terminal device is possible for each of a plurality of different management areas constituting a target area in which the communication terminal device can move. Based on the program code, the program code for receiving the information request for requesting the communication range-related information about the management area from the communication terminal device located in the management area, and the information request received from the communication terminal device. , A program code for transmitting the communication range-related information corresponding to the management area in which the communication terminal device is located to the communication terminal device.

The program according to still another aspect of the present invention is a program executed by a computer or a processor provided in a communication terminal device capable of communicating by a direct wireless communication method. This program is used as a server that manages communication range-related information regarding the range in which communication by the direct wireless communication method of the communication terminal device is possible for each of a plurality of different management areas constituting the target area where the communication terminal device can move. , The server transmits the program code for transmitting an information request requesting the communication range-related information for the management area where the communication terminal device is located and the communication range-related information corresponding to the management area where the communication terminal device is located. Includes program code to receive from.

In the server, the communication terminal device, the mobile body, the communication system, the method, and the above, the direct wireless communication method may be a direct wireless communication method using the PC5 interface included in the standard specifications of 3GPP. ..

According to the present invention, when transmitting from a communication terminal device using a direct wireless communication method between short-range devices, it is possible to specify a range in which communication is possible from the communication terminal device.

Explanatory drawing which shows an example of the whole structure of the communication system which concerns on embodiment. The explanatory view which shows an example of the data communication between vehicles by the PC5 communication system which concerns on embodiment. (A) and (b) are explanatory views which show the problem in the communication system which concerns on a reference example. The explanatory view which shows an example of associating the management area of the map information managed by the server which concerns on embodiment, and L2ID. The block diagram which shows an example of the main part composition of UE of the vehicle which concerns on embodiment. The block diagram which shows an example of the main part composition of the server which concerns on embodiment. The flowchart which shows an example of the data communication procedure by the PC5 communication system in the UE of the vehicle on the receiving side which concerns on embodiment. FIG. 5 is a flowchart showing an example of a data communication procedure by the PC5 communication method in the UE of the vehicle on the transmitting side according to the embodiment. The explanatory view which shows an example of the mapping which performs the correspondence between the management area before the new road construction and Layer-2 ID (L2ID) in the server which concerns on embodiment. The explanatory view which shows an example of the update of the mapping which associates the Layer-2 ID (L2ID) with the management area at the time of new road construction in the server which concerns on embodiment. The explanatory view which shows an example of uploading the communication information and the position information from the UE of the vehicle which concerns on embodiment to a server. The explanatory view which shows an example of the mapping of the Layer-2 ID (L2ID) and the calculation result of the propagation loss in the server which received the upload of the information of FIG. FIG. 5 is a flowchart showing an example of an information upload procedure at the time of data reception by the PC5 communication method in the UE of the receiving vehicle according to the embodiment. FIG. 5 is a flowchart showing an example of an information upload procedure at the time of data transmission by the PC5 communication method in the UE of the vehicle on the transmitting side according to the embodiment. The flowchart which shows an example of the processing in the server which concerns on embodiment. The flowchart which shows an example of the communication control using the communication range related information (radio wave propagation loss data) in the UE of the vehicle which concerns on embodiment. An explanatory diagram showing an example of communication control on a road with poor visibility. Explanatory diagram showing another example of communication control on a road with poor visibility. (A) and (b) are explanatory views which show an example of communication control which suppresses the transmission power of PC5 communication.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory diagram showing an example of the overall configuration of the communication system according to the present embodiment. In the communication system of the present embodiment, for example, the communication terminal device 31 of the vehicle 30 as a plurality of moving bodies traveling on the road 90 as the vehicle moving route communicates with PC5 without going through the mobile communication network (cellular network). It is suitable for communication systems capable of direct wireless communication such as V2V (Vehicle-to-Vehicle) depending on the method. The vehicle 30 in the present embodiment is, for example, an automobile such as a passenger car, a truck, or a bus, and the present invention is not limited to the type and number of vehicles. The present invention can also be applied to a case where the moving body is a moving body other than a vehicle such as a flying body or a ship that moves on a moving path set in the sky or water.

In FIG. 1, the communication system of the present embodiment includes a server 10 capable of communicating with each of the communication terminal devices 31 of a plurality of vehicles 30. The server 10 has a map information used for direct wireless communication between the vehicles 30 by the PC5 communication method and a range in which the communication terminal device 31 of each vehicle 30 can move the target area and can communicate by the PC5 communication method (hereinafter, "PC5"). It is possible to store and manage communication range-related information related to "communicable range"), and transmit and provide this information to the communication terminal device 31 of each vehicle 30. The server 10 may transmit information to the communication terminal device 31 of each vehicle 30 in response to an information request received from the communication terminal device 31, and may periodically or irregularly transmit information regardless of the information request. It may be delivered autonomously at the timing of.

The information request transmitted from the communication terminal device 31 to the server 10 may include information on the current position of the communication terminal device 31. In this case, the server 10 does not need to separately acquire the information on the current position of the communication terminal device 31.

The server 10 is, for example, a MEC (Multi-access Edge Computing) device provided in the base station 16 of the mobile communication network 15. The server 10 composed of the MEC device may be provided outside the node or core network between the base station 16 and the core network of the mobile communication network 15.

The server 10 designates a communication destination by the PC5 communication method of the communication terminal device 31 for each of a plurality of different management areas constituting a target area (service providing area to the user) to which the communication terminal device 31 of the vehicle 30 can move. Stores map information associated with each management area with a communication identifier (for example, Layer-2 ID described later), and performs various data processing to provide map information in response to a request from the communication terminal device 31. Can be done. The map information managed by the server 10 includes the position, shape, width W of the road 90, lanes 91R, 91L, 92U, 92D, 93U, 93D, traffic light installation position, pedestrian crossing position, presence / absence of median strip, and roadside guardrail. It may include information about the road, such as the presence or absence of.

Further, the server 10 stores communication range-related information regarding the PC5 communicable range capable of communicating by the PC5 communication method of the communication terminal device 31 for each of the plurality of management areas, and responds to a request from the communication terminal device 31. Alternatively, various data processing for providing communication range-related information can be performed autonomously without a request from the communication terminal device 31.

The base station 16 forms one or more cells (also referred to as sectors or sector cells). The cell may be formed two-dimensionally on the ground or the sea, or may be formed three-dimensionally from the sky toward the ground or the sea. The cell may be a macro cell, a small cell, a femto cell, a pico cell, a large cell, or the like. The plurality of cells may form a cellular structure that is distributed so as to be two-dimensionally or three-dimensionally adjacent to each other, or may form a hierarchical cell structure in which some or all of them are hierarchically overlapped. .. The base station 16 is a macrocell base station, a small cell base station, a femtocell base station, a picocell base station, a large cell base station, a fixed base station fixedly installed on the ground, etc. It may be a type base station or the like. The base station 16 may be a wireless communication device called an eNodeB (evolved Node B: eNB), a gNodeB (gNB), an en-gNodeB (en-gNB), an access point, or the like.

The communication terminal device 31 of the vehicle 30 is a user device (hereinafter referred to as "UE") that can be used as a subscriber of the mobile communication service. The UE 31 may be a wireless communication device called a user terminal, a terminal, a terminal device, a mobile station, a mobile device, or the like. The UE 31 of the vehicle 30 may be a device used in a state of being carried by the user in the vehicle 30, or a device installed by being incorporated in the vehicle 30 (for example, a device incorporated as a part of a navigation device). May be good.

The UE 31 of the vehicle 30 communicates with the server 10 via the base station 16 of the mobile communication network (cellular network) by the network communication method (for example, 3G, LTE, or next-generation NR method) which is the first communication method. It is possible. The UE 31 transmits and receives various information to and from the server 10 periodically (for example, periodically) or irregularly after the wireless section with the base station 16 transitions from the idle state to the connection state by the first communication method. Can be done.

The information received from the server 10 by the UE 31 is, for example, map information in which L2IDs are associated (linked) for each management area for a plurality of management areas different from each other in the service providing area, and a PC5 communication method for each of the plurality of management areas. Includes communication range-related information regarding the PC5 communication range that can be communicated by.

The information transmitted from the UE 31 to the server 10 includes, for example, position information indicating the current position of the vehicle 30 (UE 31) and communication information regarding data communication with another vehicle (UE). The position information indicating the current position of the vehicle 30 (UE31) can be calculated based on, for example, the output (positioning result) of the GNSS (Global Navigation Satellite System) receiver as the current position acquisition means provided in the UE 31. Further, the UE 31 includes at least one of a GNSS receiver, a gyroscope, an acceleration sensor, a speed sensor, and a magnetic sensor as a current position acquisition means, and measures the current position of the vehicle 30 by the GNSS receiver based on the output thereof. Even when the accuracy is low, the movement path of the vehicle 30 (UE31) may be calculated to accurately estimate the current position of the vehicle 30 (UE31), or the posture or orientation of the vehicle 30 may be estimated. This estimation result may be included in the information transmitted to the server 10.

The information transmitted from the UE 31 to the server 10 may include the speed V3 of the vehicle 30 (UE31) and the vehicle identification information (vehicle ID). The speed V3 of the vehicle 30 can be obtained from, for example, the drive control device of the vehicle 30. The speed V3 of the vehicle 30 (UE 31) may be calculated based on the time change (movement distance and movement time) of the position information in the movement history information recorded in the UE 31. Here, the "speed" of the vehicle 30 is a vector quantity represented by the direction and speed (= absolute value of speed, magnitude) of the movement of the vehicle 30.

Further, the UE 31 of the vehicle 30 uses a network communication method (for example, 3G, LTE, or next-generation NR method), which is the first communication method, via the base station 16 of the mobile communication network (cellular network). Uu communication can be performed with the UE. The UE 31 can perform Uu communication with another UE after the radio section with the base station 16 transitions from the idle state to the connection state by the first communication method.

Further, the UE 31 of the vehicle 30 can perform wireless communication with another vehicle (hereinafter, also referred to as “vehicle-to-vehicle communication”) by a second communication method that does not go through a base station of a mobile communication network (cellular network). .. The second communication method is, for example, a Sidelink method using a PC-5 (hereinafter, also referred to as “PC5”) interface (hereinafter, also referred to as a “PC5 communication method” or a “PC-5 Sidelink method”). The PC-5 interface is a D2D (Device to Device) interface in which UEs, UEs and other devices (for example, vehicles), vehicles, or vehicles and other devices communicate directly without going through a base station. Yes, it has been standardized since 3GPP Release 12. In the PC5 communication method (Sidelink method), UEs, UEs and other devices (for example, vehicles), vehicles, or vehicles and other devices are compared without using a base station by using a PC-5 interface or the like. It is a short-range wireless communication method that directly communicates in a small area.

Further, the UE 31 of the vehicle 30 communicates with the UE of the vehicle of the data transmission destination by the second communication method without using the base station of the mobile communication network (cellular network) by the PC5 communication method (Sidelink method). A single direct wireless communication (hereinafter referred to as "single hop communication") may be performed without the UE of the vehicle, or a multi with a plurality of direct wireless communications via the UE of one or more other vehicles. Hop communication may be performed.

In the PC5 communication method, the Layer-2 ID is a communication identifier (frame identifier) that identifies a frame (also referred to as a “MAC packet”) that is a data processing unit in the data link layer (Layer-2) of the layered communication model. (Hereinafter, abbreviated as "L2ID" as appropriate) is defined. The three-digit number illustrated in a frame behind the vehicle 30 in FIG. 1 is the L2ID value associated with the management area in which the vehicle 30 is located (see FIG. 2 described later).

FIG. 2 is an explanatory diagram showing an example of data communication between vehicles by the PC5 communication method according to the present embodiment. Below each of the plurality of vehicles 30 (1) to 30 (3) in FIG. 2, an example of the layered communication models 310 (1) to 310 (3) in the UEs 31 (1) to 31 (3) of each vehicle is used. Shown. In each layered communication model 310 (1) to 310 (3), from the bottom to the top, layer 1 (L1) composed of physical layers, MAC (media access control) layer and RLC (radio link control) layer Layer 2 (L2) that processes data in frame units by PDCP (packet data convergence) layer, network layer that processes data in packet units using various protocols (for example, IP, Non-IP, ARP), application layer It is composed of. Data in the application layer is also called a "message".

In FIG. 2, the UE 31 (1) of the vehicle 30 (1), which is the first communication terminal device (communication terminal device on the transmitting side), uses, for example, a part of the uplink radio resource of mobile communication, and is layer 2 ( Data (message) is transmitted in frame units by designating a Terminal L2ID (hereinafter, appropriately abbreviated as "Dst. L2ID") which is a frame identifier as a communication identifier of a transmission destination (communication destination) in L2). In the example of FIG. 2, Dst. "Yyy" is specified as the L2ID. The UEs 31 (2) and 31 (3) of the receiving side vehicles 30 (2) and 30 (3), which are the second communication terminal devices (receiving side communication terminal devices), are the transmission destinations included in the header of the received frame. It is determined whether or not the frame identifier (Dst. L2ID) of the above matches the frame identifier (L2ID) assigned to the own device.

Further, in FIG. 2, in the UE 31 (2) of the vehicle 30 (2), the frame identifier (Dst. L2ID) of the transmission destination included in the header of the received frame: yyy is assigned to the frame identifier (L2ID) of the own device. ): It is determined that the data matches yyy, and the data is processed so as to raise the packet including the data (message) of the received frame to the upper layer, so that the data can be used for the application. On the other hand, in the UE 31 (3) of the vehicle 30 (3), the frame identifier (Dst. L2ID): yyy of the transmission destination included in the header of the received frame is changed to the frame identifier (L2ID): zzz assigned to the own device. By determining that they do not match and processing the packet containing the received frame data (message) so as not to raise it to the upper layer, the data cannot be used for the application.

However, as shown in FIG. 3A, the UE 31 (1) of the transmitting vehicle 30 (1) is the transmission destination (communication destination) of the vehicle 30 (2) located in a specific management area in the vicinity. UE31 (2) Dst. I don't know the L2ID (yyy) information, so Dst. It may not be possible to transmit data with the L2ID specified. In this case, as shown in FIG. 3 (b), Dst. By transmitting the data as a broadcast without specifying the L2ID, it is conceivable that the data can be received and used by the UE 31 (2) of the vehicle 30 (2). However, since the data transmitted as a broadcast can be received and used by UEs 31 (3) to 31 (6) in the vicinity other than the UE 31 (2), only the UEs located in a specific management area in the vicinity can be used. It is difficult to use for sending data to.

Therefore, in the present embodiment, L2ID as a communication identifier is associated (linked) with each of a plurality of management areas different from each other in the target area (service providing area). The UE 31 of the vehicle 30 on the transmitting side adds L2ID corresponding to a specific area (specific management area) of the data transmission destination located around the current position of the UE as a communication identifier (Dst.L2ID) of the transmission destination. Is transmitted by the PC5 communication method. Further, the UE 31 of the vehicle 30 on the receiving side determines whether or not the communication identifier of the transmission destination added to the data received by the PC5 communication method matches the L2ID corresponding to the management area including the current position of the own UE. Is judged, and if they match, the received data is raised to the upper layer and data processing is performed so that it can be used in the application. By selecting one of the plurality of L2IDs set in association with each management area of the target area (service providing area) and designating it as the communication identifier (Dst.L2ID) of the PC5 communication method, transmission is performed. The UE 31 of the vehicle 30 on the side can transmit data by designating the area where the UE 31 of the vehicle 30 on the receiving side is located by the PC5 communication method. Then, only the UE 31 of the receiving vehicle 30 located in the area can receive the data and use it for the application.

Further, in the present embodiment, the map information in which the L2ID is associated (associated) with each management area for a plurality of management areas different from each other in the service providing area is stored and managed in the server 10. The server 10 functions as a map information database (DB), and newly sets or updates the correspondence between the map information management area and the L2ID based on the communication information and the position information received from the UE 31 of each vehicle 30. To do. The UE 31 of each vehicle 30 transmits a request for map information to the server 10 at an arbitrary timing, so that the L2ID is associated with each of the service area (management area) in which the own UE is located and the surrounding management area ( The latest map information (linked) can be downloaded and stored in the UE.

The association between the management area and the L2ID is such that the L2IDs do not overlap with each other among the management areas within the PC-5 communication range (wireless communication range) capable of communicating with a predetermined reception strength by the PC5 communication method, for example. This is done so that duplication of L2IDs is allowed between management areas that are sufficiently separated. As a result, it is possible to reliably specify a specific management area where the UE 31 of the vehicle 30 to which the data is transmitted by the PC5 communication method is located, and it is possible to minimize the number of L2IDs used for the data transmission. .. The L2IDs may be associated so that the L2IDs of all the management areas in the target area (service providing area) are different from each other.

Further, in the present embodiment, different L2IDs may be associated with each other for each traveling direction of the vehicle 30 even in the same management area. In this case, the UE 31 of the vehicle 30 on the transmitting side specifies one of a plurality of different moving directions of the vehicles (UE) in the area where the UE 31 of the vehicle 30 on the receiving side is located by the PC5 communication method. The data can be transmitted so that the data can be used only by the UE 31 of the vehicle 30 moving in the specified direction in the area.

FIG. 4 is an explanatory diagram showing an example of associating the management area and the L2ID in the map information managed by the server 10 according to the present embodiment. The example of FIG. 4 is an example in which the target area (service providing area) is a road 90 as a movable movement route of the vehicle 30. The numbers entered in each management area of the road 90 in FIG. 4 are the values of L2ID associated with the management area.

In FIG. 4, the target area constitutes each of a plurality of management areas A101, A102, and A103 that constitute an area of a road extending in the left-right direction in the figure, and an area of two roads extending in the vertical direction in the figure. It has management areas A201, A202, A211 and A212, and management areas A301 and A302 that form an area at a road intersection. L2IDs are associated with each of the plurality of different management areas constituting the target area for each management area and each vehicle traveling direction. For example, in the management area A101 extending in the left-right direction in the figure, "001" is associated with the L2ID in the right direction, and "002" is associated with the L2ID in the left direction. Further, in the management area A201 extending in the vertical direction in the drawing, "003" is associated with the L2ID in the upward direction, and "003" is associated with the L2ID in the downward direction. Further, "101" and "102" are associated with the management areas A301 and A302 of the intersection as L2IDs regardless of the direction, respectively.

FIG. 5 is a block diagram showing an example of a main configuration of the UE 31 of the vehicle 30 according to the present embodiment. In FIG. 5, the UE 31 includes an information acquisition unit (information acquisition means) 311, a position information acquisition unit (position information acquisition means) 312, and an information storage unit (information storage means) 313.

The information acquisition unit 311 is capable of communicating (associating) map information in which L2IDs are associated with each management area for a plurality of management areas different from each other in the above-mentioned service providing area, and communication by the PC5 communication method of each of the plurality of management areas. Communication range related information is received from the server 10 and acquired. For example, the information acquisition unit 311 uses a network communication system (for example, a next-generation NR system such as 3G system, LTE system, 5G, etc.) and uses a wireless resource assigned to the UE 31 to perform a mobile communication network (cellular network). ) By wirelessly communicating with the base station 16 of 15, the server 10 is accessed and the map information and the communication range related information are downloaded.

The position information acquisition unit 312 acquires the position information of the current position of the UE 31 of the own vehicle 30 by the above-mentioned GNSS receiver or the like.

The information storage unit 313 stores the map information and communication range-related information acquired from the server 10 by the information acquisition unit 311 and the position information of the current position of the UE 31 of the own vehicle 30 acquired by the position information acquisition unit 312.

Further, the UE 31 includes an identifier acquisition unit (identifier acquisition means) 314, an identifier selection unit (identifier selection means) 315, and a data transmission unit (data transmission means) 316.

Further, when transmitting data to the UE or the like of a surrounding vehicle, the identifier acquisition unit 314 refers to the map information stored in the information storage unit 313, or refers to both the map information and the communication range-related information. , Acquires a plurality of L2IDs corresponding to a plurality of management areas around the current position of the UE 31 of the own vehicle 30. Further, when the identifier acquisition unit 314 receives data from the UE or the like of a surrounding vehicle, the identifier acquisition unit 314 refers to the map information stored in the information storage unit 313 and has a management area including the current position of the UE 31 of the own vehicle 30. Acquire the L2ID corresponding to the area).

When the identifier selection unit 315 transmits data to the UE or the like of a surrounding vehicle, the identifier selection unit 315 obtains an L2ID corresponding to a specific management area (data transmission target area) from a plurality of communication identifiers acquired by the identifier acquisition unit 314. Select as L2ID. In addition, the identifier selection unit 315 Dsts the L2ID corresponding to a specific management area (area to be data transmission) according to at least one of the type of communication service accompanied by data transmission by the PC5 communication method and the purpose of communication. .. It may be selected as L2ID. In this case, data can be transmitted by designating a different area for each type of communication service that involves data transmission by the PC5 communication method, for each purpose of the communication, or for each combination of the type and use. it can.

The data transmission unit 316 sets the L2ID corresponding to the specific management area of the data transmission target to Dst. Frames containing data added as L2ID (destination communication identifier) are single-hop communication of PC5 communication method (hereinafter also referred to as "PC5 single-hop communication") and multi-hop communication of PC5 communication method (hereinafter "PC5 multi-hop"). It is also referred to as "communication"), or is transmitted to the UE of a vehicle in the peripheral area by Uu communication of a network communication method via a base station of a mobile communication network (cellular network).

The UE 31 also includes a data receiving unit (data receiving means) 317 and a data processing unit (data processing means) 318. The data receiving unit 317 uses PC5 single-hop communication, PC5 multi-hop communication, or Uu communication, which is a network communication method via a base station of a mobile communication network (cellular network), to receive a frame containing data from the UE of a nearby vehicle. Receive.

The data processing unit 318 applies Dst.D. to the data received by the data receiving unit 317. Data processing that enables the application to use the received data when the destination L2ID added as the L2ID matches the L2ID corresponding to the management area including the current position of the own vehicle 30 (UE31). I do.

In addition, the UE 31 includes an information transmission unit (information transmission means) 319 that transmits various information to the server 10. For example, when the data transmission unit 316 transmits data, the information transmission unit 319 sets the current position of the own vehicle 30 (UE31), the data transmission power, and the management area where the own vehicle 30 (UE31) is located. Information including the corresponding L2ID is transmitted to the server 10. Further, when the data receiving unit 317 receives the data, the information transmitting unit 319 sets the current position of the own vehicle 30 (UE31), the received power of the data, and the communication identifier of the transmitting side included in the received data. The included information is transmitted to the server 10.

Further, the UE 31 includes a communication control unit (communication control means) 320 that controls data communication with another UE and communication with the server 10. For example, when the communication control unit 320 determines that the communication distance that can be communicated from the current position of the UE 31 in the PC5 communication range is equal to or less than a predetermined first threshold value (Lth1) based on the communication range-related information received from the server 10. , Single-hop communication with the UE of the data transmission destination by the PC5 communication method, to at least one communication of multi-hop communication via one or more other UEs by the PC5 communication method and Uu communication via the mobile communication network. Control to switch. Further, when the communication control unit 320 determines that the communication distance that can be communicated from the current position of the UE 31 is equal to or greater than a predetermined second threshold value (Lth2) based on the communication range-related information received from the server 10, the PC5 communication method is used. Control so as to suppress the transmission power. Here, the first threshold value (Lth1) and the second threshold value (Lth2) may be the same value or different values (for example, Lth1 <Lth2).

FIG. 6 is a block diagram showing an example of the main configuration of the server 10 according to the present embodiment. In FIG. 6, the server 10 includes an information storage unit (storage means) 101, a request reception unit (request reception means) 102, an information transmission unit (information transmission means) 103, and a vehicle (UE) information reception unit (information reception). Means) 104 and an information processing unit (information processing means) 105.

The information storage unit 101 specifies a communication destination by the PC5 communication method of the UE 31 for each of a plurality of different management areas constituting a target area (service providing area to the user) to which the communication terminal device 31 of the vehicle 30 can move. The map information associated with the L2ID to be used for each management area is stored.

Further, the information storage unit 101 stores communication range-related information in which the PC5 communicable range, which is the range in which the UE 31 can communicate by the PC5 communication method, is associated with each management area for each of the plurality of management areas.

The communication range-related information includes, for example, propagation loss information (path loss data) relating to the distribution of propagation loss of radio waves transmitted from the UE 31 located in the management area, or other management capable of receiving the radio waves with a predetermined received power. It is communicable area information (for example, L2ID) about the area. Further, the communication range-related information includes propagation loss information (path loss data), communicable distance information regarding a distance at which the radio wave can be received with a predetermined reception power, and other management areas where the radio wave can be received with a predetermined reception power. It may include at least one piece of communicable area information about the communicable area information and the non-communicable area information about another management area that cannot receive the radio wave with a predetermined received power.

The request receiving unit 102 receives an information request including the position information of the current position of the UE 31 (vehicle 30) from the UE 31. If the server 10 can separately acquire the position information of the current position of the UE 31 (vehicle 30), it is not necessary to include the position information of the current position of the UE 31 (vehicle 30) in the information request.

Based on the map information request received from the UE 31 of the vehicle 30, the information transmission unit 103 has the L2ID corresponding to the management area (area in the service area) including the current position of the UE 31 (vehicle 30) and the periphery of the UE 31 (vehicle 30). Map information including the L2ID corresponding to one or more management areas is transmitted to the UE 31 of the vehicle 30.

Further, based on the information request received from the UE 31 of the vehicle 30, the information transmission unit 103 provides the communication range-related information corresponding to the management area (area in the service area) including the current position of the UE 31 (vehicle 30) to the vehicle. It is transmitted to the UE 31 of 30.

The vehicle (UE) information receiving unit 104 receives data from the UE 31 of the transmitting vehicle 30 that has transmitted data by the PC5 communication method, the current position of the transmitting UE 31 (vehicle 30), the transmission power, and the transmitting UE 31. Receives information including a Source L2ID (hereinafter referred to as "Src.L2ID") which is an L2ID. Further, the vehicle (UE) information receiving unit 104 receives data from the UE 31 of the receiving side vehicle 30 that has received data by the PC5 communication method, the current position of the receiving side UE 31 (vehicle 30), the received power, and the transmitting side. UE31 Src. Receives information including L2ID.

The information processing unit 105 can receive radio waves by the PC5 communication method with a predetermined reception power so as to be able to respond to changes in the environment of the radio propagation path of the PC5 communication method (for example, new construction of a building that becomes an obstacle to the propagation of radio waves). The L2ID is associated and set for each management area based on the information on the radio wave communication possible distance.

For example, the information processing unit 105 sets different L2IDs for a plurality of management areas that are separated from each other by an inter-area distance equal to or less than the wireless communicable distance, and sets mutual L2IDs at an inter-area distance longer than the wireless communicable distance. For a plurality of management areas that are separated from each other, processing is performed so as to allow the same L2ID setting. In this case, it is possible to reliably specify a specific management area where the UE 31 of the vehicle 30 of the data transmission destination by the PC5 communication method is located, and it is possible to minimize the number of L2IDs used for the data transmission. ..

Further, the information processing unit 105 determines the above-mentioned communication range-related information based on the information received from each of the UE 31 of the transmitting vehicle 30 and the UE 31 of the receiving vehicle 30. For example, the information processing unit 105 calculates the distribution of the received power and the propagation loss centered on the position of the UE 31 (vehicle 30) on the transmitting side, and estimates the wireless communication possible distance. Further, the information processing unit 105 can specify the PC5 communicable range that can be communicated from the current position of the UE 31 based on the information of the wireless communicable distance. In this case, it is possible to acquire the latest information on the environmental change of the wireless propagation path of the PC5 communication method and set and update the correspondence for each management area of the L2ID. Further, since the information received from each of the UE 31 of the transmitting side vehicle 30 and the UE 31 of the receiving side vehicle 30 that have transmitted / received data is used to acquire the latest information on the environmental change of the radio propagation path, the radio propagation path There is no need to perform a separate process to obtain the latest information on environmental changes.

FIG. 7 is a flowchart showing an example of a data communication procedure by the PC5 communication method in the UE 31 of the receiving vehicle 30 according to the present embodiment.
In FIG. 7, the UE 31 of the vehicle 30 on the receiving side downloads the above-mentioned map information from the server 10 via the base station 16 periodically (for example, periodically) or irregularly at a predetermined timing (S101). ). The map information may be downloaded from the server 10 at the timing when the map information is updated, for example.

Next, the UE 31 on the receiving side executes positioning processing periodically (for example, periodically) or irregularly at a predetermined timing to acquire the current position of its own UE 31, refers to the map information, and performs the positioning process. Acquire the L2ID of the area (management area) including the current position of the own UE 31 (S102, S103). The current position of the own UE 31 and the L2ID may be acquired, for example, at a timing when the mileage of the vehicle 30 (UE31) from the previous acquisition becomes longer than the preset reference distance.

Next, when the receiving UE 31 receives a frame containing data transmitted from a surrounding vehicle (UE) by the PC5 communication method, whether the frame (data) is added to the frame (data) or the L2ID is in the area of the own UE 31. It is determined whether or not the L2ID corresponds to the area (management area), that is, whether or not the data addressed to the own UE has been received (S104).

When receiving a frame containing data addressed to its own UE, the receiving UE 31 passes the data contained in the receiving frame to the application layer, which is the upper layer in the layered communication model, so that the data can be used by the application (S105). ).

FIG. 8 is a flowchart showing an example of a data communication procedure by the PC5 communication method in the UE 31 of the vehicle 30 on the transmitting side according to the present embodiment.
In FIG. 8, the UE 31 of the vehicle 30 on the transmitting side downloads the above-mentioned map information from the server 10 via the base station 16 periodically (for example, periodically) or irregularly at a predetermined timing (S201). ). The map information may be downloaded from the server 10 at the timing when the map information is updated, for example.

Next, the UE 31 on the transmitting side executes positioning processing periodically (for example, periodically) or irregularly at a predetermined timing to acquire the current position of its own UE 31, refers to the map information, and performs the positioning process. The L2ID of the area (management area) including the current position of the own UE 31 and the L2ID of one or a plurality of management areas around the current position are acquired (S202, S203). The acquisition of the current position and L2ID of the own UE 31 may be performed, for example, at the timing when the mileage of the vehicle 30 (UE31) from the previous acquisition becomes longer than the preset reference distance, or at the timing before data transmission. ..

Next, the UE 31 on the transmitting side identifies the target vehicle to which the data is to be transmitted and the surrounding area where the target vehicle is predicted to be located, according to the type of service for transmitting data to the surrounding vehicle (UE) by the PC5 communication method. Select an area (management area) (S204).

Next, the UE 31 on the transmitting side sets the L2ID corresponding to the above-selected specific area (management area) to Dst. It is additionally specified as L2ID (communication identifier of the destination), and its Dst. A frame containing data for which L2ID is specified is transmitted to the periphery by the PC5 communication method (S205).

In particular, according to the example of the data communication procedure of FIG. 8, the Dst. Corresponding to the specific area (management area) selected according to the type of service. By specifying the L2ID (communication identifier of the destination), the data can be transmitted by changing the destination area of the PC5 communication method according to the service.

Next, the setting and updating of the association between each management area and the L2ID in the communication system according to the present embodiment will be described.
9 and 10 are explanatory views showing an example of mapping for associating the management area and L2ID before and after the new road construction in the server 10 according to the present embodiment, respectively.
The management area A102 to the right of the intersection of the T-junction of the road 90 before the new road in FIG. 9 has no road intersection and has different L2IDs (005 and 006) in each of the two directions opposite to each other. Assigned.

When the road 96 is newly constructed in FIG. 10 to form a T-junction, new L2IDs (007 and 008) that are different from each other in each of the two directions upside down in the management area A211 of the newly constructed road 96 are generated. Assigned. Further, a new L2ID (102) is assigned to the newly formed T-junction intersection management area A302, and the newly defined management area A103 on the right side of the intersection has two directions opposite to each other. New L2IDs (009 and 010) that are different from each other are assigned to.

As illustrated in FIGS. 9 and 10, when a new road is constructed, it is necessary to newly set and update the management area and L2ID. However, road conditions such as road construction may change depending on the time, and new setting and updating of the management area and L2ID become complicated. Further, in order to minimize the value that can be assigned as the L2ID associated with the management area, there is a request that the same value be used as the L2ID as much as possible in consideration of the communicable distance of the PC5 communication method.

Therefore, in the present embodiment, the communication information including the received power in the PC-5 communication method in which the data can be received by each vehicle 30 (UE31) and the L2ID (Src.L2ID) of the transmission source is transmitted to each vehicle 30 (UE31). The radio wave propagation loss is calculated by uploading and aggregating the position information to the server 10 and collating it with the position information and transmission power uploaded from the data transmission source vehicle 30 (UE31), and based on the radio wave propagation loss. Therefore, the wireless communication range (wireless communication range) of the PC5 communication method in each management area is obtained, and the L2ID is mapped to each management area.

FIG. 11 is an explanatory diagram showing an example of uploading communication information and location information from the UE of the vehicle according to the embodiment to the server 10. In FIG. 11, the UE of the vehicle 30 (1) on the transmitting side that transmitted data by the PC-5 communication method is the Src. The communication information including the L2ID and the transmission power and the position information of the own vehicle are transmitted to the server 10 via the base station 16. The UE of the vehicle 30 (1) on the transmitting side may add the position information of the own vehicle to the data when transmitting the data by the PC-5 communication method.

The UEs of the receiving vehicles 30 (2) and 30 (3) that could receive the data from the UE of the transmitting vehicle 30 (1) are the transmitting Src. The communication information including the L2ID and the received power and the position information of the own vehicle are transmitted to the server 10 via the base station 16. If the position information of the UE on the transmitting side is added to the data by the PC-5 communication method received from the UE of the vehicle 30 (1) on the transmitting side, the position information of the UE on the transmitting side is also included. It may be transmitted to the server 10.

The UE of the receiving vehicle 30 (4), which could not receive the data from the UE of the transmitting vehicle 30 (1), transmits only the position information of the own vehicle to the server 10 via the base station 16.

FIG. 12 is an explanatory diagram showing an example of mapping between the calculation result of the propagation loss and the L2ID in the server 10 that has received the upload of the information of FIG. "○" in the graph shown in the lower part of FIG. 12 is the propagation of radio waves at the UE positions of a plurality of vehicles on the data receiving side with reference to the UE positions of the data transmitting vehicle 30 (1), respectively. This is an example of the loss calculation result. The distance (range) in which the approximate curve of the calculation result of the propagation loss is equal to or less than a predetermined threshold value Th is the wireless communication possible distance (range) R of the PC5 communication method. Since the management area A103 at the right end of the road 90 in FIG. 12 is located outside the wireless communication possible distance (range) R, the same L2ID (= 001,002) as the management area A101 at the left end of the road 90 is assigned. ing.

FIG. 13 is a flowchart showing an example of an information upload procedure at the time of data reception by the PC5 communication method in the UE of the receiving vehicle according to the present embodiment. In FIG. 13, when the UE 31 of the vehicle 30 on the receiving side receives data by the PC5 communication method (S301), the transmission source Src. The L2ID and the location information of the transmission source are extracted (S302). Next, the UE 31 of the vehicle 30 on the receiving side performs positioning to measure the current position of the UE of the own vehicle (S303), and Src. Communication information including L2ID and received power, source position information, and own UE position information are transmitted to the server 10 via the base station 16 (S304).

FIG. 14 is a flowchart showing an example of an information upload procedure at the time of data transmission by the PC5 communication method in the UE of the vehicle on the transmitting side according to the present embodiment. In FIG. 14, the UE 31 of the vehicle 30 on the transmitting side transmits data by the PC5 communication method (S401), performs positioning to measure the current position of the UE of the own vehicle (S402), and performs positioning to measure the current position of the UE of the own vehicle (S402). The communication information including the L2ID and the transmission power and the location information of the transmission source are transmitted to the server 10 via the base station 16 (S403).

FIG. 15 is a flowchart showing an example of a procedure for setting / updating communication range-related information and mapping L2ID in the server 10 according to the present embodiment.
In FIG. 15, the server 10 receives communication information and position information from the UE of the transmitting vehicle and the UEs of a plurality of receiving vehicles that have transmitted / received data by the PC5 communication method (S501). The communication information received from the UE of the vehicle on the transmitting side is the Src. Includes L2ID and transmission power. The communication information received from the UE of the vehicle on the receiving side is the transmission information of Src. Includes L2ID and received power.

Next, the server 10 uses the PC5 communication method in the UE of each receiving side vehicle based on the transmission power received from the UE of the transmitting vehicle and the received power received from the UEs of the plurality of receiving side vehicles. Radio wave propagation loss (= transmission power-reception power) is calculated (S502), and from the distribution of the propagation loss, data can be transmitted and received by the PC5 communication method centered on the position of the UE of the vehicle on the transmitting side. The PC5 communicable range (wireless communicable range), which is a two-dimensional range of the distance, is calculated (S503).

Next, the server 10 newly sets or updates the communication range-related information regarding the PC5 communication range (wireless communication range) for the corresponding management area, and based on the PC5 communication range (wireless communication range). L2ID mapping (new setting or update) is performed (S504, S505).

In the PC5 communication system in the communication system having the above configuration, the distance capable of wireless communication changes depending on the surrounding environment (for example, NLOS, LOS) such as the existence of buildings in the PC5 communication path and road conditions, and the distance becomes a certain point (management area). When performing direct wireless communication transmitted from a located UE 31, it is difficult to specify a communicable range from the UE 31. In addition, considering that the communication distance in PC5 communication is not uniform and varies greatly depending on the surrounding environment such as road conditions, the PC5 communication range at each point (managed area) changes depending on the surrounding environment. If the shortest communication distance, which is the shortest of the wireless communication distances, is set uniformly, the advantage of the communication distance of the PC5 communication method, such as direct wireless communication even at a relatively long distance, cannot be fully utilized.

Therefore, in the present embodiment, the server 10 determines the above-mentioned communication range-related information based on the above-mentioned PC5 communication range in each management area. For example, the server 10 maps the L2ID to each management area, and specifies the PC5 communication range, which is the range in which the UE 31 of the vehicle 30 can communicate with the PC5 communication method for each management area (S504 in FIG. 15). , S505). The communication range-related information regarding the range in which communication by the PC5 communication method specified for each management area is possible is aggregated and managed by the server 10. When the server 10 receives an information request requesting communication range-related information from the UE 31 of the vehicle 30 at an arbitrary timing, the server 10 transmits the communication range-related information corresponding to the management area in which the UE 31 is located to the UE 31 in response to the information request. (S506 in FIG. 15).

FIG. 16 is a flowchart showing an example of communication control using propagation loss information (path loss data) of the PC5 communication path in the UE 31 of the vehicle 30 according to the present embodiment.

In FIG. 16, the UE 31 of the vehicle 30 receives the propagation loss information (path loss data) corresponding to the current position (positioning data) of the own UE or the management area where the own UE is located from the server 10 (S601), and the propagation loss thereof. Based on the information (path loss data) and the current position (positioning data) of the own UE, the communication distance capable of direct wireless communication by the PC5 communication method is calculated from the current position of the own UE (S602).

Next, the UE 31 of the vehicle 30 determines whether the calculated communication distance is equal to or less than the preset first threshold value (Lth1) (S603), and if affirmative (YES in S603), the normal single of the PC5 communication method. Since data cannot be transmitted to the UE of the vehicle of the transmission destination (communication destination) by hop communication, the data transmission mode is set to multi-hop communication of the PC5 communication method and network communication via the base station 16 of the mobile communication network (cellular network). It is controlled to switch to both communication of the Uu communication of the method (S604).

For example, the UE 31 (Src.L2ID: 001) of the vehicle 30 (1) located in the management area A101 of the road 90 having a greatly curved detour in FIG. 17 is a vehicle located in the management area A106 of the transmission destination (communication destination). Since the building group 80 exists in the middle of the linear radio path between the UE 31 (Dst. L2ID: 012) of 30 (2), the communication distance in the linear radio path is equal to or less than the first threshold value (Lth1). Therefore, the data transmission mode is switched from PC5 single-hop communication to both PC5 multi-hop communication and Uu communication.

Further, the UE 31 (Src.L2ID: 001) of the vehicle 30 (1) located in the management area A101 of the road 90 bent into an L shape in FIG. 18 is a vehicle of a transmission destination (communication destination) located in the management area A106. Since the building group 80 exists in the middle of the linear radio path between the UE 31 (Dst. L2ID: 012) of 30 (2), the communication distance in the linear radio path is equal to or less than the first threshold value (Lth1). Therefore, the data transmission mode is switched from PC5 single-hop communication to both PC5 multi-hop communication and Uu communication.

In PC5 multi-hop communication, the UE 31 (Src. L2ID: 001) of the vehicle 30 (1) has a Dst. "012" is set as the L2ID, and "transmission mode parameters" set in advance to distinguish between PC5 multi-hop communication and PC5 single-hop communication (1: normal PC5 single-hop communication, 2: PC5 multi-hop communication). Set to "2" to send data. The UE 31 of the vehicle 30 (3) located in the intermediate management area (A104) where the radio waves transmitted from the UE 31 of the vehicle 30 (1) can be received with a predetermined reception intensity is included in the received data in the “transmission mode”. Based on the value of "parameter" (= 2), the value of "Dst.L2ID" is left as "012" and transmitted (broadcast) to the surroundings so as to transfer the received data.

In the UE 31 of the vehicle 30 (2) of the transmission destination (communication destination), the L2ID (012) added to the frame (data) received from the UE of the vehicle 30 (3) is the area (management area) of the own UE 31. ) Corresponding to L2ID (= 012), the data included in the received frame is passed to the application layer, which is the upper layer in the layered communication model, so that the data can be used by the application.

Further, in Uu communication, the UE 31 (Src.L2ID: 001) of the vehicle 30 (1) is the transmission destination (communication destination) of the vehicle 30 (2) via the base station 16 of the mobile communication network (cellular network). Data is transmitted to the UE 31.

In the present embodiment, when it is determined that the communication distance is equal to or less than the first threshold value (Lth1), the data transmission mode is switched from PC5 single-hop communication to both PC5 multi-hop communication and Uu communication. You may switch to either hop communication or Uu communication.

Returning to FIG. 16, when the UE 31 of the vehicle 30 is negative in the judgment of S603 (No in S603), it further determines whether the calculated communication distance is equal to or higher than the preset second threshold value (Lth2) (S605). ), If affirmative (YES in S605), control is performed so as to suppress the transmission power of data transmission in order to optimize the radio resource of the PC5 communication method (S606).

For example, in the straight road 90 of FIG. 19A, the calculated communication distance is a distance that is too long (for example, about 500 m or longer) than the second threshold value (Lth2), and the vehicle 30 (1). ) Is controlled so as to suppress the transmission power when data is transmitted from the UE 31 (S606). As a result, as shown in FIG. 19B, it is possible to suppress excessive jumping of radio waves when data is transmitted from the UE 31 of the vehicle 30 (1), and to effectively use the radio resources of the PC5 communication method.

Returning to FIG. 16, if the UE 31 of the vehicle 30 is negative in the judgment of S605 (No in S605), the PC5 communication using the normal transmission power is performed without switching the transmission mode and suppressing the transmission power at the time of data transmission. Data is transmitted by the single-hop communication of the method (S607).

The example of FIGS. 16 to 19 is an example in which the information received from the UE 31 of the vehicle 30 from the server 10 and used for calculating the communication distance is the propagation loss information (path loss data). Alternatively, or in addition to the propagation loss information, other information (for example, the above-mentioned communicable area information or non-communicable area information) may be received from the server 10 and used for calculating the communication distance. Further, the UE 31 of the vehicle 30 may receive the communication distance from the server 10 without calculating the communication distance.

As described above, according to the present embodiment, the server 10 can collectively manage the information of the communicable range of the plurality of vehicles 30 located in each of the plurality of management areas 30 by the PC5 communication method and provide the information to each UE 31. When transmitting from the UE 31 of the vehicle 30 using the PC5 communication method, the range in which communication is possible from the UE 31 can be specified.
Further, according to the present embodiment, at least one of PC5 single-hop communication, PC5 multi-hop communication, and Uu communication under an environment in which the communication distance that can be communicated from the current position of the UE 31 is equal to or less than a predetermined first threshold value (Lth1). By switching to communication, data can be reliably transmitted to the UE 31 of the vehicle 30 (2) of the transmission destination (communication destination).
Further, when the communication distance that can be communicated from the current position of the UE 31 is equal to or more than a predetermined second threshold value (Lth2), the transmission power at the time of data transmission is suppressed to avoid a field where the reach of radio waves is unnecessarily widened. It is possible to effectively use the radio resources of the PC5 communication method.

Further, according to the present embodiment, a plurality of Layer-2 IDs (L2IDs) associated with each management area for a plurality of management areas different from each other constituting a target area in which the UE 31 incorporated in the vehicle 30 can move. By selecting one of them and designating it as the communication identifier (Dst. L2ID) of the transmission destination of the PC5 communication method, the UE 31 of the transmitting vehicle 30 is located and the UE 31 of the receiving vehicle 30 is located by the PC5 communication method. Data can be sent by specifying the area in which it is located.
Also, PC-5 communication using only the data link layer (Layer-2) in the layered communication model of the next-generation 3GPP standard specifications such as LTE or 5th generation (NR) (without being aware of the application layer). The destination area of the method can be limited.
In addition, the processing of unnecessary data in the application layer can be reduced, and the requirements of the application can be relaxed.
Further, the requirement of the antenna directional beam of the PC5 communication method can be relaxed, and the antenna of the PC5 communication can be miniaturized and the cost can be reduced.

Further, according to the present embodiment, the UE of the transmitting vehicle can specify the area where the UE of the receiving vehicle is located by the PC5 communication method and transmit the data, and the area designation is included. Map information used for data transmission can be collectively managed and provided to each UE.
Further, the mapping of Layer-2 ID (L2ID) as the communication identifier of the PC5 communication method can be autonomously performed.

The processing steps described in this specification and the components of the communication terminal device (UE), the base station, the server, the MEC device, and the communication system can be implemented by various means. For example, these steps and components may be implemented in hardware, firmware, software, or a combination thereof.

Regarding hardware implementation, means such as a processing unit used to realize the above steps and components in an entity (for example, various wireless communication devices, eNodeBs, terminals, hard disk drive devices, or optical disk drive devices) One or more application-specific ICs (ASICs), digital signal processors (DSPs), digital signal processors (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), processors , Controllers, microcontrollers, microprocessors, electronic devices, other electronic units designed to perform the functions described herein, computers, or combinations thereof.

For firmware and / or software implementation, means such as processing units used to implement the above components are programs (eg, procedures, functions, modules, instructions) that perform the functions described herein. , Etc.) may be implemented. Generally, any computer / processor readable medium that explicitly embodies the firmware and / or software code is a means such as a processing unit used to implement the steps and components described herein. May be used to implement. For example, the firmware and / or software code may be stored in memory and executed by a computer or processor, for example, in a control device. The memory may be implemented inside the computer or processor, or may be implemented outside the processor. Further, the firmware and / or software code may be, for example, a random access memory (RAM), a read-only memory (ROM), a non-volatile random access memory (NVRAM), a programmable read-only memory (PROM), or an electrically erasable PROM (EEPROM). ), FLASH memory, floppy (registered trademark) discs, compact discs (CDs), digital versatile discs (DVDs), magnetic or optical data storage devices, etc. Good. The code may be executed by one or more computers or processors, or the computers or processors may be made to perform functional embodiments described herein.

Further, the medium may be a non-temporary recording medium. Further, the code of the program may be read and executed by a computer, a processor, or another device or device machine, and the format thereof is not limited to a specific format. For example, the code of the program may be any of source code, object code, and binary code, or may be a mixture of two or more of these codes.

Also, the description of the embodiments disclosed herein is provided to allow one of ordinary skill in the art to manufacture or use the disclosure. Various amendments to this disclosure will be readily apparent to those of skill in the art and the general principles defined herein are applicable to other variations without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not limited to the examples and designs described herein, but should be accepted in the broadest range consistent with the principles and novel features disclosed herein.

10: Server 15: Mobile communication network 16: Base station 30: Vehicle 31: Communication terminal device (UE)
80: Building group 90: Road 101: Information storage unit 102: Request reception unit 103: Information transmission unit 104: Information reception unit 105: Information processing unit 311: Information acquisition unit 312: Position information acquisition unit 313: Information storage unit 314: Identifier acquisition unit 315: Identifier selection unit 316: Data transmission unit 317: Data reception unit 318: Data processing unit 319: Information transmission unit 320: Communication control unit

Claims (11)

A server that provides information
Map information in which different identifiers are associated with each of a plurality of different management areas constituting the target area on the road on which the communication terminal device of the vehicle traveling on the road can move, and the said for each of the plurality of management areas. A storage means for storing communication range-related information including identifiers of other management areas where the communication terminal device of the vehicle located in the management area can directly communicate by the wireless communication method.
An information request receiving means for receiving an information request for requesting information related to the communication range from a communication terminal device of an information requesting vehicle located in any one of the plurality of management areas.
In response to the information request received from the communication terminal device of the vehicle of the information request source, the communication terminal device of the vehicle of the information request source includes communication including an identifier of another management area capable of communicating by the direct wireless communication method. An information transmission means for transmitting range-related information to the communication terminal device of the information request source, and
From the communication terminal device of the transmitting vehicle that transmitted the data including the identifier of the management area of the transmitting side to the other management area of the receiving side by the direct wireless communication method, the current state of the communication terminal device of the transmitting vehicle. A vehicle on the receiving side located in another management area on the receiving side that receives information including a position, a transmission power of the data, and an identifier of the management area on the transmitting side, and receives the data by the direct wireless communication method. An information receiving means that periodically receives information including the current position of the communication terminal device of the vehicle on the receiving side, the reception power of the data, and the identifier of the management area on the transmitting side from the communication terminal device of the above.
Based on the information received from each of the communication terminal device of the vehicle on the transmitting side and the communication terminal device of the vehicle on the receiving side, the management area where the communication terminal device of the vehicle on the transmitting side is located is communicated by the direct wireless communication method. A server comprising: an information processing means for determining communication range related information including an identifier of another management area capable of the like. In the server of claim 1,
The information request is a server including information on the current position of the communication terminal device that has transmitted the information request. In the server of claim 1 or 2.
The direct wireless communication system is a server characterized by being a direct wireless communication system using a PC5 interface included in the standard specifications of 3GPP. A communication system including the server according to any one of claims 1 to 3 and a communication terminal device provided in a vehicle and capable of communicating by a direct wireless communication method.
The communication terminal device of the vehicle is a communication system including an information acquisition means for acquiring information related to the communication range corresponding to a management area in which the communication terminal device is located from the server. In the communication system of claim 4,
The information acquisition means of the communication terminal device is a communication system characterized in that an information request requesting information related to the communication range is transmitted to the server in a management area where the communication terminal device is located. In the communication system of claim 4 or 5,
The communication terminal device is
Data in which a communication identifier corresponding to a specific management area selected from a plurality of different management areas constituting a target area to which the communication terminal device can move is added as a communication identifier of a communication destination is transmitted by the direct wireless communication method. Data transmission means and
It is characterized by comprising an information transmission means for transmitting information including the current position of the communication terminal device, the transmission power of the data, and the identifier corresponding to the management area in which the communication terminal device is located to the server. Communications system. In the communication system according to any one of claims 4 to 6.
The communication terminal device is
A data receiving means for receiving data obtained by adding an identifier corresponding to a management area in which the communication terminal device is located as a communication identifier of a communication destination by the direct wireless communication method.
A communication characterized by comprising an information transmitting means for transmitting information including the current position of the communication terminal device, the received power of the data, and the communication identifier of the transmitting side added to the data to the server. system. In the communication system according to any one of claims 4 to 7.
Based on the communication range-related information corresponding to the management area in which the communication terminal device is located, the communication terminal device determines that the communication distance that can be communicated from the current position of the communication terminal device is equal to or less than a predetermined first threshold value. When, communication with the communication terminal device of the transmission destination by the direct wireless communication method is performed by multi-hop communication with the communication terminal device of the transmission destination via one or more other communication terminal devices by the direct wireless communication method. A communication system further comprising a communication control means for switching to at least one communication of Uu communication with the communication terminal device of the transmission destination via a mobile communication network. In the communication system according to any one of claims 4 to 8.
Based on the communication range-related information corresponding to the management area in which the communication terminal device is located, the communication terminal device determines that the communication distance that can be communicated from the current position of the communication terminal device is equal to or greater than a predetermined second threshold value. A communication system further comprising a communication control means for suppressing transmission power by the direct wireless communication method. It ’s a way of providing information,
Map information in which different identifiers are associated with each of a plurality of different management areas constituting the target area on the road on which the communication terminal device of the vehicle traveling on the road can move, and the said for each of the plurality of management areas. The communication terminal device of the vehicle located in the management area stores communication range-related information including identifiers of other management areas that can directly communicate by wireless communication method.
Receiving an information request requesting the communication range-related information from the communication terminal device of the vehicle of the information requesting source located in the management area of any one of the plurality of management areas.
In response to the information request received from the communication terminal device of the vehicle of the information request source, the communication terminal device of the vehicle of the information request source includes communication including an identifier of another management area capable of communicating by the direct wireless communication method. Sending range-related information to the communication terminal device that requested the information,
From the communication terminal device of the transmitting vehicle that transmitted the data including the identifier of the management area of the transmitting side to the other management area of the receiving side by the direct wireless communication method, the current state of the communication terminal device of the transmitting vehicle. A vehicle on the receiving side located in another management area on the receiving side that receives information including a position, a transmission power of the data, and an identifier of the management area on the transmitting side, and receives the data by the direct wireless communication method. Periodically receive information including the current position of the communication terminal device of the vehicle on the receiving side, the reception power of the data, and the identifier of the management area on the transmitting side from the communication terminal device of the above.
Based on the information received from each of the communication terminal device of the vehicle on the transmitting side and the communication terminal device of the vehicle on the receiving side, the management area where the communication terminal device of the vehicle on the transmitting side is located is communicated by the direct wireless communication method. Determining coverage-related information, including the identifiers of other controlled areas that can be
A method characterized by including. A program that runs on a computer or processor on a server that provides information.
Map information in which different identifiers are associated with each of a plurality of different management areas constituting the target area on the road on which the communication terminal device of the vehicle traveling on the road can move, and the said for each of the plurality of management areas. A program code for storing communication range-related information including identifiers of other management areas where the communication terminal device of the vehicle located in the management area can directly communicate by the wireless communication method.
An information request receiving means for receiving an information request for requesting information related to the communication range from a communication terminal device of an information requesting vehicle located in any one of the plurality of management areas.
In response to the information request received from the communication terminal device of the vehicle of the information request source, the communication terminal device of the vehicle of the information request source includes communication including an identifier of another management area capable of communicating by the direct wireless communication method. A program code for transmitting range-related information to the communication terminal device of the information request source, and
From the communication terminal device of the transmitting vehicle that transmitted the data including the identifier of the management area of the transmitting side to the other management area of the receiving side by the direct wireless communication method, the current state of the communication terminal device of the transmitting vehicle. A vehicle on the receiving side located in another management area on the receiving side that receives information including a position, a transmission power of the data, and an identifier of the management area on the transmitting side, and receives the data by the direct wireless communication method. A program code for periodically receiving information including the current position of the communication terminal device of the vehicle on the receiving side, the reception power of the data, and the identifier of the management area on the transmitting side from the communication terminal device of the above.
Based on the information received from each of the communication terminal device of the vehicle on the transmitting side and the communication terminal device of the vehicle on the receiving side, the management area where the communication terminal device of the vehicle on the transmitting side is located is communicated by the direct wireless communication method. Program code for determining coverage-related information, including the identifiers of other managed areas that can be
A program characterized by including.

Images