JP2020072278A - Vehicle communication system and communication method of the same - Google Patents

Abstract

To provide a vehicle communication system in which an increase in traffic volume can be prevented by reducing unnecessary communication.SOLUTION: The vehicle communication system comprises: a vehicle terminal which transmits an uniquely identifiable identification information and service request; and an MEC (Mobile Edge Computing) server. The MEC server comprises: a receiving unit receiving, from the vehicle terminal being present within a range where service can be provided, the identification information and service content requested by the vehicle terminal; a storage unit storing a correspondence table indicating relationship between the received identification information and the service content; a processing unit setting a service provided to the vehicle terminal corresponding to the identification information of the correspondence table; and a transmission unit providing a service to the vehicle terminal.SELECTED DRAWING: Figure 4

Description

  The present application relates to a vehicle communication system and a communication method thereof.

  There has been proposed MEC (Mobile Edge Computing) in which a server having computing resources is arranged near a mobile communication base station such as an LTE (Long Term Evolution) base station or an access point. The MEC is a mechanism that allows a new application or service to be provided by providing a computing resource or storage in a base station or the like which is an edge of a mobile communication network. By using this MEC, there are advantages such as reduction of communication delay and data load distribution.

  On the other hand, various types of "vehicles and objects" shown in communication V2V (Vehicle to Vehicle) between vehicles, communication V2I (Vehicle to Infrastructure) between vehicles and roadside equipment and communication V2P (Vehicle to Pedestrian) between vehicles and pedestrians There is known communication in which V2X (Vehicle to Everything) communication, which is a general term for "communication with," is performed to notify a driver of information for preventing an accident.

In a vehicle communication system (hereinafter referred to as V2X communication system), 3GPP (Third Generation Partnership Project) defines a C-V2X (Cellar V2X) communication system using LTE or 5G (fifth generation mobile communication system). .
In the C-V2X communication system, by utilizing the MEC, the processing performed by the vehicle terminal of the automobile is distributed to the MEC, which has an advantage that high-speed application processing can be performed.

In the C-V2X communication system, a technique of relaying V2X communication data via a mobile communication base station such as LTE is disclosed in Patent Document 1, for example.
In the communication shown in Patent Document 1, a terminal installed in a facility around a road is used as a part of a V2X communication network by operating as a RSU (Road Side Unit) or a relay node. First, as a first step, a RSU for providing a V2X communication system service and a first message including capability information indicating that it can operate as a relay node for relaying a communication service to a network entity. Send.

Then, as a second step, the terminal receives a second message from the base station instructing to operate as an RSU or a relay node.
Further, the second message operates as an RSU or a relay node to communicate with the base station and other terminals.
Further, when a business operator installs a terminal for the purpose of specially constructing a communication network, when the terminal communicates with a base station, the installed terminal may be an RSU or a relay node from an entity that manages a V2X communication system service. As an identifier, the identifier indicating that it can operate preferentially is set, and the identifier is used to connect to the base station. It has been proposed that, when the identifier is notified and a connection request is made to the base station, the terminal that does not use the identifier is processed with priority.

Japanese Patent Publication No. 2018-518913

  In the case of the communication method of the conventional V2X communication system described above, when the infrastructure side transmits information indicating whether or not the communication service for providing the V2X communication service can be relayed to the vehicle terminal, and the vehicle terminal can relay the information. Only the V2X data is transmitted to the infrastructure side. With such a configuration, all the data transmitted from the vehicle terminal is relayed to the vehicle terminals in the specific area, which causes a problem of increasing the traffic amount.

  In view of the above problems, the present application aims to prevent an increase in traffic volume by reducing unnecessary communication.

  A vehicle communication system of the present application, to a vehicle terminal that transmits uniquely identifiable identification information and a service request, the identification information from the vehicle terminal within a range that can provide a service, and the service content requested by the vehicle terminal, A receiving unit that receives the information, a storage unit that stores a correspondence table of the received identification information and the service content, and a processing unit that sets a service provided to the vehicle terminal that corresponds to the identification information of the correspondence table. And a MEC server including a transmission unit that provides a service to the vehicle terminal.

  According to the present application, as compared with the conventional V2X communication system, communication is performed only to the relevant vehicle terminal, and unnecessary communication is reduced, whereby an increase in traffic volume can be prevented.

It is a figure which shows the structure of embodiment of the V2X communication system of this application. It is a block diagram which shows the structure of the MEC server of the V2X communication system of this application. It is a figure which shows the flowchart of embodiment of the V2X communication system of this application. It is a figure which shows the correspondence table in the MEC server of the V2X communication system of this application. It is a figure which shows the structure of 2nd Embodiment of the V2X communication system of this application.

  The embodiments shown below are described mainly for LTE and LTE-Advanced. However, 5G (5th generation mobile communication system) standardized by 3GPP (Third Generation Partnership Project) or other mobile communication networks such as 3GPP UMTS (Universal Mobile Telecommunication System), 3GPP2 CDMA2000 system (1xRTT (1xRTT ( Single-Carrier Radio Transmission Technology), HRPD (High Rate Packet Data), GSM / GPRS (Global System for Mobile communication / General Packet Radio Service) system, and WiMAX (Worldwide Interoperability for Microwave Access) system Good.

Embodiment 1
FIG. 1 shows the configuration of a mobile communication network applied in the embodiment of the present application.
As shown in FIG. 1, an in-vehicle vehicle terminal 1 for LTE is provided via an eNodeB (evolved Node B) 8 and an S / P-GW (Serving y / Packet Data Network Gateway) 5 which are LTE base stations. It is connected to a PDN (packet data network) 10. The eNodeB 8 is arranged in a RAN (Radio Access Network) 7 and performs wireless communication with a plurality of vehicle terminals 1 connected to the RAN 7. The S-GW is a visited packet gateway that accommodates the 3GPP access system. The P-GW is a connection point with the PDN 10, and is a gateway that assigns an IP address and transfers a packet to the S-GW.

  The core network 6 is a network mainly managed by an operator who provides mobile communication services. The core network 6 includes, for example, an MME (Mobility Management Entity) 2, an HSS (Home Subscriber Server) 3, a PCRF (Policy and Changing Rules Function) 4, and an S / P-GW 5.

  The MME 2 accommodates and manages the eNodeB 8, and cooperates with the HSS 3 that manages customer information such as the telephone number of the subscriber of the mobile network or the identification number of the SIM card, user authentication, mobility management of the vehicle terminal 1, NAS (Non-Non- It performs session management such as Access Stratum (Signaling) and EPS (Evolved Packet System) bearer management. A PCRF4 (Policy and Changing Rules Function) determines policy control such as QoS (Quality of Service) or charging control rules.

The S / P-GW 5 connects a packet data network such as an IMS (Internet Protocol Multimedia Subsystem) or the Internet. In addition, an IP address is assigned to the vehicle terminal 1.
Of the S / P-GW 5, the S-GW (Serving Gateway) accommodates 3GPP radio such as LTE and 3G radio, and transmits user data. It also serves as a point for switching the transfer path between the LTE and 3G wireless access accommodation networks.

  The MEC (Mobile Edge Computing) server 9 shown in FIG. 1 is a mechanism that enables the provision of applications and services by allocating computing resources or storage to base stations and the like, and is standardized by the ETSI (European Telecommunications Standards Institute). It is being advanced. As shown in FIG. 1, the MEC server 9 is connected to the eNodeB 8, but may be connected to another network node.

  FIG. 2 shows a hardware configuration example of the MEC server 9 for implementing the present application. The MEC server 9 includes a CPU (Central Processing Unit) 11, a memory 13, a wireless IF (wireless interface) 12, and a transmission path IF (transmission path interface) 14, which are connected to each other via a bus. An antenna 15 is connected to the wireless IF 12. The transmission line IF 14 is connected to an external network via a transmission line such as a wired LAN.

  The memory 13 includes a main storage device and an auxiliary storage device. The main memory is composed of a RAM (Random Access Memory) or a combination of a RAM and a ROM (Read Only Memory). The auxiliary storage device is composed of, for example, a nonvolatile storage medium such as an HDD (Hard Disk Drive), an SSD (Solid State Drive), and a flash memory. The memory 13 is provided with a correspondence table of applications and services provided to the vehicle.

Next, an embodiment will be described using the flowchart shown in FIG.
In the embodiment, the vehicle terminal 1 is connected to the MEC server 9, and the MEC server 9 constitutes an edge computing system that provides a service to the vehicle terminal 1.
When the vehicle terminal 1 enters the range (area) where the service can be provided by the MEC server 9, the vehicle terminal 1 for vehicle mounting attempts to connect to the MEC server 9 via the eNodeB 8. At that time, the vehicle terminal 1 notifies the MEC server 9 of information that can uniquely identify the vehicle terminal 1 and a list of corresponding services.

  Then, the MEC server 9 stores, in the memory 13, information that can uniquely identify the vehicle terminal 1 and a correspondence table of services corresponding to the vehicle terminal 1. The memory 13 is provided with a list of predetermined services, and it is determined whether a list of corresponding applications has been received from the vehicle (step S11). When the list of applications is received, the received information is added so as to be reflected in the correspondence table (step S12). After that, similarly to the case where the list of applications is not received, the traveling data of the vehicle (including the moving direction, speed, acceleration, traveling route history, position information, etc.) is received (step S13).

  It is confirmed whether or not the vehicle terminal of the received travel data is set in the correspondence table so as to receive the application or service provided according to the travel data (step S14). When it is set to receive such an application, the vehicle transmits the traveling data (step S15). If it is not set to receive such an application, the data from the vehicle terminal is not required, and the travel data is unnecessary and the process ends.

  The MEC server 9 stores the received service list of the vehicle terminal 1 and the information that can uniquely identify the vehicle terminal 1 in the correspondence table of the MEC server 9. Note that “uniquely identifiable” means that it can be determined by being distinguished from other objects, and the information that can uniquely identify the vehicle terminal 1 may be the IP address of the vehicle terminal 1. It may be a unique ID (Identification) of the vehicle terminal 1.

  An example of the correspondence table in the MEC server is shown in FIG. As shown in FIG. 4, the correspondence table is provided by coding the unique identifier of the vehicle terminal and the content of the corresponding service. That is, the unique identifier shown in FIG. 4 is information that can be uniquely identified and is provided for each vehicle terminal. The content of the service provided to this identifier is provided in response to a request from the vehicle terminal. Here, as examples of services, 001 is an alarm application, 002 is video sharing, and 003 is content distribution, and three types of services are provided to the vehicle terminals described in the upper row. This means that only one type of service is provided to the vehicle terminals in the lower row.

  That is, regarding the vehicle terminal described in the upper part of the correspondence table of FIG. 4, the MEC server 9 of the V2X communication system is used for the purpose of calling attention to the driver of the vehicle. In this way, when the MEC server 9 is responsible for relaying data, the MEC server 9 refers to the correspondence table and calls attention in accordance with the data transmitted from the vehicle terminal 1 to the MEC server 9. Data is relayed only to the vehicle terminal 1 requesting the service. As a result, the amount of communication can be suppressed as compared with the case where the MEC server 9 transmits to all vehicle terminals that can relay data.

Embodiment 2
The MEC server 9 shown in the first embodiment has shown one corresponding MEC server 9 in order to explain the operation for the vehicle terminal 1. On the other hand, in the second embodiment, a V2X communication system in which a plurality of MEC servers continuously provide an application or service as a vehicle terminal moves will be described.

  FIG. 5 is a diagram showing the configuration of the V2X communication system according to the second embodiment. As shown in FIG. 5, the range in which the service can be provided is divided and assigned by a plurality of MEC servers, and the traveling data of the vehicle terminals can be continuously shared between the MEC servers. That is, from the range in which the vehicle terminal 1 that has been providing the service by the first MEC server 91 can move and provide the service of the first MEC server 91 to the range in which the service of the second MEC server 92 can be provided. When moving, the information of the vehicle terminal 1 is sent from the first MEC server 91 to the second MEC server 92, and subsequently the service is provided from the second MEC server 92 to the vehicle terminal 1. is there.

  In this way, the correspondence table of the first MEC server 91 may be shared with the second MEC server 92 in the neighboring area. That is, when the vehicle terminal 1 tries to move out of the service range of the MEC server 9 and identifies that it will be in the service providing range of another MEC server before it goes out of the service range, The information regarding the vehicle terminal 1 is transferred to another MEC server. The MEC server to be transferred is determined by determining which MEC server the service range provided by the vehicle terminal 1 enters from the position information, orientation, speed, and acceleration included in the data transmitted by the vehicle terminal 1. Information is transferred so that the MEC server of the destination can provide the service to the vehicle terminal 1. When the vehicle terminal 1 goes out of the service range, the data of the vehicle terminal 1 can be deleted in the first MEC server 91.

  In addition, the information regarding the vehicle terminals stored in the correspondence table may be deleted under certain conditions. For example, when data is not received from the vehicle terminal 1 within a certain period of time, it may be considered that the vehicle terminal is out of the service range of the MEC server and the information about the vehicle terminal may be deleted. Further, when it is determined that the vehicle terminal is going to move out of the service range of the MEC server from the information such as the position information, direction, speed, and acceleration of the vehicle terminal included in the data transmitted from the vehicle terminal, Information about the corresponding vehicle terminal may be deleted from the correspondence table. These deletion methods are mere examples, and deletion methods different from the above examples may be used.

Although the present application describes various example embodiments, various features, aspects, and functions described in one or more embodiments are limited to the application of the particular embodiment. Instead, it is applicable to the embodiments alone or in various combinations.
Therefore, innumerable variations not illustrated are envisioned within the scope of the technology disclosed herein. For example, it is assumed that at least one component is modified, added or omitted, and at least one component is extracted and combined with the components of other embodiments.

1 vehicle terminal, 2 MME, 3 HSS, 4 PCRF, 5 S / P-GW,
6 core network, 7 RAN, 8 eNodeB, 9 MEC server,
10 PDN, 11 CPU, 12 wireless IF, 13 memory, 14: transmission line IF,
15 antenna, 91 1st MEC server, 92 2nd MEC server

Vehicle communication system of the present application, services vehicle terminal transmits the service contents the identification information that uniquely identifies the vehicle terminal vehicle terminal requests, and that the said vehicle terminal before and SL identification information from the vehicle terminal requests And a storage unit that stores a correspondence table of the received identification information and the service content requested by the vehicle terminal, and the vehicle terminal corresponding to the identification information of the correspondence table. An MEC server having a processing unit that sets a service according to the service content requested by the vehicle terminal, and a transmission unit that provides the vehicle terminal with only the service content requested by the vehicle terminal is provided. Is to

According to the present application, as compared to the conventional V2X communication system, the communication service of only the service content requested by the vehicle terminal is performed to reduce unnecessary communication, thereby preventing an increase in traffic volume.

In addition, the information regarding the vehicle terminals stored in the correspondence table may be deleted under certain conditions. For example, when data is not received from the vehicle terminal 1 within a certain period of time, it may be considered that the vehicle terminal is out of the service range of the MEC server and the information about the vehicle terminal may be deleted. Further, when it is determined that the vehicle terminal is going to move out of the service range of the MEC server from the information such as the position information, direction, speed, and acceleration of the vehicle terminal included in the data transmitted from the vehicle terminal, You may delete the information about the correspondence table or we appropriate vehicle terminal. These deletion methods are mere examples, and deletion methods different from the above examples may be used.

Claims (8)

  Receiving the identification information from the vehicle terminal and the service content requested by the vehicle terminal to the vehicle terminal that transmits uniquely identifiable identification information and request information, and the vehicle terminal within a range where a service can be provided. A receiving unit, a storage unit that stores a correspondence table of the received identification information and the service content, and a processing unit that sets a service provided to the vehicle terminal corresponding to the identification information of the correspondence table, A vehicle communication system comprising: an MEC server having a transmission unit that provides a service to the vehicle terminal.   The vehicle communication system according to claim 1, wherein the information received by the receiving unit is reflected in the correspondence table.   The MEC server is a plurality of MEC servers to which a range capable of providing a service is divided and assigned, and the information of the correspondence table is shared among the plurality of MEC servers. The vehicle communication system described.   When the MEC server determines that the information of the vehicle terminal reflected in the correspondence table is unnecessary, the information that can identify the vehicle terminal from the correspondence table and the service corresponding to the vehicle terminal are deleted from the correspondence table. The vehicle communication system according to Item 1.   In the MEC server, a first step of receiving identifiable identification information, a service request, and travel data from a vehicle terminal, and storing a correspondence table of information that can identify the vehicle terminal and a service that the vehicle terminal supports 2. A communication method for a vehicle communication system comprising: the step 2; and a third step of transmitting travel data to a predetermined vehicle terminal according to the correspondence table.   The said MEC server is provided with two or more, the range which can provide the service by the said MEC server is divided, it allocates, and the information of the said correspondence table is shared among several said MEC servers. Communication method of the vehicle communication system of.   The communication method for a vehicle communication system according to claim 5, wherein the information received in the first step is reflected in the correspondence table.   When the MEC server determines that the information of the vehicle terminal reflected in the correspondence table is unnecessary, the information that can identify the vehicle terminal from the correspondence table and the service corresponding to the vehicle terminal are deleted from the correspondence table. Item 5. A communication method for a vehicle communication system according to Item 5.

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