WO2022032545A1

WO2022032545A1 - Communication method and apparatus

Info

Publication number: WO2022032545A1
Application number: PCT/CN2020/108749
Authority: WO
Inventors: 李岚涛; 欧阳国威
Original assignee: 华为技术有限公司
Priority date: 2020-08-12
Filing date: 2020-08-12
Publication date: 2022-02-17
Also published as: CN115669003A

Abstract

A communication method and apparatus, which relate to the technical field of V2X, and are used for reducing power consumption of a V2X terminal. The method comprises: a first terminal switching from a first reception mode to a second reception mode, wherein the first reception mode is used for the first terminal to continuously receive data on a PC5 port, and the second reception mode is used for the first terminal to receive data on the PC5 port within a reception window of a reception period; and the first terminal broadcasting first information, wherein the first information is used for representing that the first terminal is in the second reception mode.

Description

Communication method and device

technical field

The present application relates to the technical field of vehicle to everything (V2X), and in particular, to a communication method and device.

Background technique

V2X technology is the key technology of future intelligent transportation system. It enables communication between vehicles, vehicles and base stations, enabling vehicles to obtain real-time road conditions, road information, pedestrian information and other traffic information, thereby effectively improving driving safety, reducing congestion, improving traffic efficiency, and providing vehicle-mounted entertainment information, etc.

In V2X communication scenarios, some V2X terminals have limited battery capacity. For these V2X terminals, how to reduce the power consumption of the V2X terminals so that the V2X terminals can be used for a longer period of time is an urgent technical problem to be solved.

SUMMARY OF THE INVENTION

The present application provides a communication method, which can be used to reduce the power consumption of a V2X terminal.

In a first aspect, a communication method is provided, the method comprising: switching a first terminal from a first receiving mode to a second receiving mode, where the first receiving mode is used for the first terminal to continuously receive data on the PC5 port, and the second receiving mode uses The first terminal receives data on the PC5 port within the receiving window of each receiving period; the first terminal broadcasts the first information, and the first information is used to indicate that the first terminal is in the second receiving mode.

Based on the above technical solution, since the first terminal switches from the first receiving mode to the second receiving mode, the first terminal only receives data on the PC5 port within the receiving window, so that the first terminal reduces the time required to receive data and reduces the power consumption of the terminal. And, the first terminal broadcasts the first information, so that other terminals around the first terminal can know that the first terminal is in the second receiving mode. In this way, other surrounding terminals can send data to the first terminal at an appropriate time, so as to prevent the first terminal from not receiving important messages sent by other surrounding terminals. In this way, the purpose of taking into account the security and power saving of the first terminal is achieved.

In a possible design, the first information includes user information of the first terminal, and the first information also includes one or more of the following parameters: the duration of the reception window, the duration of the reception cycle, the start time of the reception window, The start time of the receiving period, or the receiving mode information; the receiving mode information is used to indicate the receiving mode in which the first terminal is located.

In a possible design, the switching of the first terminal from the first receiving mode to the second receiving mode includes: the V2X layer of the first terminal receives third information, and the third information is used to instruct switching to the second receiving mode; the first The V2X layer of the terminal instructs the access layer of the first terminal to switch to the second reception mode.

In a possible design, the third information includes the duration of the reception period of the first terminal and the duration of the reception window of the first terminal. In this way, the V2X layer of the first terminal can determine the duration of the reception period and the duration of the reception window used in the second reception mode according to the third information.

In a possible design, the method further includes: the application layer of the first terminal determines to switch the first terminal from the first receiving mode to the second receiving mode; the application layer of the first terminal sends the first terminal to the V2X layer of the first terminal. Three information.

In a possible design, the application layer of the first terminal determining to switch the first terminal from the first receiving mode to the second receiving mode includes: the application layer of the first terminal determining that the first terminal does not have a security risk. In this way, the first terminal can use the second receiving mode without a security risk, so as to achieve the purpose of taking into account both power saving and security.

In a possible design, the application layer of the first terminal determines that there is no security risk in the first terminal, including: the application layer of the first terminal acquires motion information of at least one second terminal; the application layer of the first terminal acquires the first terminal The application layer of the first terminal determines that there is no security risk in the first terminal according to the motion information of the first terminal and the motion information of at least one second terminal. It can be understood that, the motion information of at least one second terminal can reflect the surrounding traffic conditions. Therefore, the first terminal can effectively determine whether the surrounding traffic environment poses a security threat to the first terminal according to the motion information of the at least one second terminal.

In a possible design, the application layer of the first terminal determines that there is no security risk in the first terminal according to the motion information of the first terminal and the motion information of at least one second terminal, including: the application layer of the first terminal according to the first terminal. The motion information of the terminal and the motion information of the at least one second terminal determine that any one of the at least one second terminal satisfies the first preset condition.

In a possible design, the first preset condition includes a combination of one or more of the following:

The relative distance between the second terminal and the first terminal is greater than or equal to the first preset value;

The relative speed between the second terminal and the first terminal is less than or equal to the second preset value;

The confidence of the collision between the second terminal and the first terminal is less than or equal to the third preset value; or,

The predicted motion trajectory of the second terminal and the predicted motion trajectory of the first terminal have no intersection.

It should be understood that the collision risk between the first terminal and the second terminal is relatively small when the first preset condition is satisfied.

In a possible design, the method includes: switching the first terminal from the second receiving mode to the first receiving mode.

In a possible design, the switching of the first terminal from the second receiving mode to the first receiving mode includes: the V2X layer of the first terminal receives fourth information, and the fourth information is used to switch the first terminal to the first receiving mode. ; the V2X layer of the first terminal instructs the access layer of the first terminal to switch to the first receiving mode.

In a possible design, the method further includes: the application layer of the first terminal determines to switch the first terminal from the second receiving mode to the first receiving mode; the application layer of the first terminal sends the first terminal to the V2X layer of the first terminal. Four information.

In a possible design, the application layer of the first terminal determining to switch the first terminal from the second receiving mode to the first receiving mode includes: the application layer of the first terminal determining that the first terminal has a security risk.

In a possible design, before the first terminal switches from the second receiving mode to the first receiving mode, the method further includes: the first terminal receives the second information sent by the second terminal within the receiving window, the second information It is used to trigger the first terminal to switch from the second receiving mode to the first receiving mode.

In a possible design, the switching of the first terminal from the second reception mode to the first reception mode includes: the V2X layer of the first terminal instructs the access layer of the first terminal to switch to the first reception mode according to the second information.

In a second aspect, a communication method is provided, the method comprising: the second terminal determines to switch the first terminal in the second reception mode to the first reception mode, where the second reception mode is used for the first terminal in each reception cycle Receive data on the PC5 port within the receiving window; the second terminal sends second information to the first terminal, the second information is used to trigger the first terminal to switch from the second receiving mode to the first receiving mode, and the first receiving mode is used for the first terminal. Continuously receive data on the PC5 port.

Based on the above technical solution, the second terminal sends the second information to the first terminal, so that the first terminal switches from the second receiving mode to the first receiving mode. In this way, the first terminal in the first receiving mode can receive messages sent by other surrounding terminals in time, so as to know the traffic situation around the first terminal, so as to ensure the safety of the user of the first terminal.

In a possible design, the method further includes: the second terminal receives the first information sent by the first terminal, and the first information is used for the first terminal to be in the second receiving mode.

In a possible design, the first information includes user information of the first terminal, and the first information further includes one or more of the following parameters: the duration of the reception window of the first terminal, the duration of the reception cycle of the first terminal , the start time of the reception window of the first terminal, the start time of the reception period of the first terminal, or the reception mode information; the reception mode information is used to indicate the reception mode in which the first terminal is located.

In a possible design, when the first information includes the duration of the reception period of the first terminal and the duration of the reception period of the first terminal, the second terminal sends the second information to the first terminal, including: the second terminal During the first time period, the fourth information is repeatedly sent with the first time period as the sending time interval. The duration of the receive window. In this way, among the second information sent multiple times by the second terminal, the sending timing of at least one second information is within the receiving window of the first terminal, which ensures that the first terminal can receive the second information.

In a possible design, the source layer 2 identity (layer 2 Identity, L2 ID) used by the first information is the layer 2 identity of the first terminal. When the first information includes the duration of the reception period of the first terminal and the duration of the reception period of the first terminal, the second terminal sends the second information to the first terminal, including: the second terminal according to the duration of the reception period and the first terminal The layer 2 identifier of one terminal determines the time domain offset value of the receiving window; the second terminal determines the start time of the receiving window of the first terminal according to the time domain offset value; the second terminal determines the starting time of the receiving window according to the starting time and The duration of the receiving window, the second information is sent to the first terminal within the receiving window of the first terminal.

In a possible design, when the first information includes the duration of the receiving window of the first terminal and the start time of the receiving window of the first terminal, the second terminal sends the second information to the first terminal, including: the first terminal. The second terminal sends the second information to the first terminal within the receiving window of the first terminal according to the duration of the receiving window of the first terminal and the start time of the receiving window of the first terminal.

In a possible design, the second terminal sends the second information to the first terminal, including: the second terminal according to the preconfigured duration of the receiving window of the first terminal and the start time of the receiving window of the first terminal, in the first terminal. A terminal sends the second information to the first terminal within the receiving window of the terminal.

In a possible design, the second terminal determining to switch the first terminal in the second receiving mode to the first receiving mode includes: the second terminal determining that the first terminal has a security risk. It should be understood that when the first terminal has a security risk, the second terminal triggers the first terminal to switch to the first receiving mode, which can ensure the security of the user of the first terminal.

In a possible design, the second terminal determines that the first terminal has a security risk, including: the second terminal acquires the motion information of the first terminal and the motion information of the second terminal; the second terminal obtains the motion information of the first terminal and the motion information of the second terminal; The motion information of the second terminal determines that the second terminal does not meet the first preset condition.

In a possible design, the second terminal determining that the first terminal has a security risk includes: the second terminal determining that the second terminal is in an out-of-control state. It should be understood that the fact that the second terminal is out of control indicates that there is a high possibility of collision between the first terminal and the second terminal, so the second terminal can determine that the first terminal has a safety risk.

In a possible design, the second information further includes user information of the first terminal.

In a third aspect, a communication device is provided, including a processing module and a communication module. Among them, the processing module is used to switch from the first receiving mode to the second receiving mode, the first receiving mode is used for the first terminal to continuously receive data on the PC5 port, and the second receiving mode is used for the first terminal to receive data in each receiving cycle. Receive data on the PC5 port within the receive window. The communication module is used for broadcasting first information, where the first information is used to represent that the first terminal is in the second receiving mode.

In a possible design, the processing module for switching from the first receiving mode to the second receiving mode specifically includes: the V2X layer of the first terminal receives third information, and the third information is used to indicate switching to the second receiving mode. ; the V2X layer of the first terminal instructs the access layer of the first terminal to switch to the second reception mode according to the third information.

In a possible design, the third information includes the duration of the reception period of the first terminal and the duration of the reception window of the first terminal.

In a possible design, the processing module is further configured to perform the following operations: the application layer of the first terminal determines to switch the first terminal from the first receiving mode to the second receiving mode; the application layer of the first terminal sends the first terminal to the first terminal. The V2X layer sends the third message.

In a possible design, the processing module is further configured to perform the following operation: the application layer of the first terminal determines that there is no security risk in the first terminal.

In a possible design, the processing module is further configured to perform the following operations: the application layer of the first terminal acquires the motion information of at least one second terminal; the application layer of the first terminal acquires the motion information of the first terminal; the first terminal acquires the motion information of the first terminal; The application layer of the first terminal determines that there is no security risk in the first terminal according to the motion information of the first terminal and the motion information of at least one second terminal.

In a possible design, the processing module is further configured to perform the following operations: the application layer of the first terminal determines any one of the at least one second terminal according to the motion information of the first terminal and the motion information of the at least one second terminal. The second terminal satisfies the first preset condition.

In a possible design, the first preset condition includes a combination of one or more of the following: the relative distance between the second terminal and the first terminal is greater than or equal to the first preset value; The relative speed between one terminal is less than or equal to the second preset value; or, the confidence of collision between the second terminal and the first terminal is less than or equal to the third preset value; or, the predicted motion trajectory of the second terminal There is no intersection with the predicted motion trajectory of the first terminal.

In a possible design, the processing module is further configured to switch from the second receiving mode to the first receiving mode.

In a possible design, the processing module is further configured to switch from the second receiving mode to the first receiving mode, including: the V2X layer of the first terminal receives fourth information, and the fourth information is used to switch the first terminal to the first receiving mode. A receiving mode; the V2X layer of the first terminal instructs the access layer of the first terminal to switch to the first receiving mode.

In a possible design, the processing module is further configured to perform the following operations: the application layer of the first terminal determines to switch the first terminal from the second receiving mode to the first receiving mode; the application layer of the first terminal sends the first terminal to the first terminal. The V2X layer sends the fourth message.

In a possible design, the processing module is further configured to perform the following operation: the application layer of the first terminal determines that the first terminal has a security risk.

In a possible design, the communication module is further configured to receive second information sent by the second terminal within the receiving window, where the second information is used to trigger the first terminal to switch from the second receiving mode to the first receiving mode.

In a possible design, the processing module is further configured to perform the following operation: the V2X layer of the first terminal instructs the access layer of the first terminal to switch to the first receiving mode according to the second information.

In a fourth aspect, a communication device is provided, including a processing module and a communication module. The processing module is used for determining to switch the first terminal in the second receiving mode to the first receiving mode, and the second receiving mode is used for the first terminal to receive data on the PC5 port within the receiving window of each receiving period. The communication module is used to send the second information to the first terminal, the second information is used to trigger the first terminal to switch from the second receiving mode to the first receiving mode, and the first receiving mode is used for the first terminal to continuously receive data on the PC5 port .

In a possible design, the communication module is further configured to receive the first information sent by the first terminal, and the first information is used for the first terminal to be in the second receiving mode.

In a possible design, the communication module is specifically configured to use the first duration as Sending time interval, the fourth information is repeatedly sent, the duration of the first time period is greater than or equal to the duration of the reception period of the first terminal, and the first duration is less than or equal to the duration of the reception window of the first terminal.

In a possible design, the source layer 2 identifier used by the first information is the layer 2 identifier of the first terminal. The processing module is specifically configured to determine the duration of the reception window according to the duration of the reception cycle and the layer 2 identifier of the first terminal when the first information includes the duration of the reception cycle of the first terminal and the duration of the reception cycle of the first terminal. Time domain offset value; according to the time domain offset value, determine the start time of the receiving window of the first terminal. The communication module is specifically configured to send the second information to the first terminal within the receiving window of the first terminal according to the start time of the receiving window and the duration of the receiving window.

In a possible design, the communication module is specifically configured to, when the first information includes the duration of the reception window of the first terminal and the start time of the reception window of the first terminal, according to the duration of the reception window of the first terminal. and the start time of the receiving window of the first terminal, and sending the second information to the first terminal within the receiving window of the first terminal.

In a possible design, the communication module is specifically configured to send the first terminal to the first terminal within the receiving window of the first terminal according to the preconfigured duration of the receiving window of the first terminal and the start time of the receiving window of the first terminal. 2. Information.

In a possible design, the processing module is specifically configured to determine that the first terminal has a security risk.

In a possible design, the processing module is specifically used to obtain the motion information of the first terminal and the motion information of the second terminal; the second terminal determines the second terminal according to the motion information of the first terminal and the motion information of the second terminal. The first preset condition is not met.

In a possible design, the processing module is specifically configured to determine that the second terminal is in an out-of-control state.

In a fifth aspect, a communication device is provided, the communication device includes a processor and a transceiver, and the processor and the transceiver are used to implement any one of the methods provided in any one of the first or second aspects above. Wherein, the processor is configured to perform processing actions in the corresponding method, and the transceiver is configured to perform the actions of receiving/transmitting in the corresponding method.

In a sixth aspect, a chip is provided, including: a processing circuit and a transceiver pin, where the processing circuit and the transceiver pin are used to implement the method provided in the first aspect or the second aspect. Wherein, the processing circuit is used for executing the processing actions in the corresponding method, and the transceiver pins are used for executing the actions of receiving/transmitting in the corresponding method.

In a seventh aspect, a computer-readable storage medium is provided, the computer-readable storage medium stores computer instructions that, when the computer instructions are executed on a computer, cause the computer to execute any one of the first aspect or the second aspect. any method.

In an eighth aspect, a computer program product is provided, which when the computer instructions are executed on a computer, causes the computer to execute any one of the methods provided in any one of the first aspect or the second aspect.

In a ninth aspect, a communication system is provided, the communication system includes a first terminal and a second terminal. The first terminal is configured to execute any one of the methods provided in the foregoing first aspect. The second terminal is configured to execute any one of the methods provided in the second aspect.

It should be noted that, for the technical effect brought by any one of the designs in the third aspect to the ninth aspect, reference may be made to the technical effect brought by the corresponding design in the first aspect or the second aspect, which will not be repeated here.

Description of drawings

1 is a schematic diagram of a communication process of a V2X terminal;

FIG. 2 is an architectural diagram of a communication system provided by an embodiment of the present application;

3 is a schematic diagram of a protocol layer of a terminal according to an embodiment of the present application;

FIG. 4 is a schematic structural diagram of a communication device according to an embodiment of the present application;

5 is a schematic diagram of a second receiving mode provided by an embodiment of the present application;

6 is a flowchart of a communication method provided by an embodiment of the present application;

FIG. 7 is a flowchart of another communication method provided by an embodiment of the present application;

FIG. 8(a) is a flowchart of another communication method provided by an embodiment of the present application;

FIG. 8(b) is a flowchart of another communication method provided by an embodiment of the present application;

9 is a flowchart of a method for determining a security risk provided by an embodiment of the present application;

10 is a flowchart of another communication method provided by an embodiment of the present application;

FIG. 11 is a flowchart of another communication method provided by an embodiment of the present application;

12 is a flowchart of another communication method provided by an embodiment of the present application;

13 is a flowchart of another communication method provided by an embodiment of the present application;

FIG. 14 is a schematic structural diagram of a communication apparatus according to an embodiment of the present application.

detailed description

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.

In the description of this application, unless otherwise stated, "/" means "or", for example, A/B can mean A or B. In this article, "and/or" is only an association relationship to describe the associated objects, which means that there can be three kinds of relationships, for example, A and/or B, which can mean that A exists alone, A and B exist at the same time, and B exists alone these three situations. Further, "at least one" means one or more, and "plurality" means two or more. The words "first" and "second" do not limit the quantity and execution order, and the words "first", "second" and the like do not limit certain differences.

It should be noted that, in this application, words such as "exemplary" or "for example" are used to represent examples, illustrations or illustrations. Any embodiment or design described in this application as "exemplary" or "such as" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present the related concepts in a specific manner.

As shown in Figure 1, the communication process of a V2X terminal includes the following steps:

S11. The V2X layer of the receiving end determines the first L2 ID.

In a possible design, the V2X layer of the receiver obtains the first L2 ID from the application layer of the receiver.

In another possible design, the V2X layer of the receiving end acquires the first V2X service identifier from the application layer of the receiving end; then, the V2X layer of the receiving end obtains the first V2X service identifier and the correspondence between the V2X service identifier and the L2 ID according to the first V2X service identifier , and determine the first L2 ID corresponding to the first V2X service identifier.

S12. The application layer of the sending end sends the V2X service data and the second V2X service identifier corresponding to the V2X service data to the V2X layer of the sending end.

S13. The V2X layer of the sender determines the source (source) L2 ID and the destination (destination) L2 ID of the V2X service data.

Specifically, the V2X layer of the sender determines the second L2 ID corresponding to the V2X service data according to the mapping relationship between the V2X service identifier and the DST L2 ID, and the second V2X service identifier corresponding to the V2X service data. The V2X layer of the sender uses the second L2 ID as the target L2 ID of the V2X service data.

The V2X layer of the sender uses the L2 ID of the sender as the source L2 ID of the V2X service data. It is understandable that in the V2X communication scenario, each device will be configured with its own unique L2 ID within the communication range of the device.

S14. The V2X layer of the sender transmits the V2X service data, the source L2 ID and the destination L2 ID to the access layer, and the access layer encapsulates the V2X service data into a V2X message.

S15. The sender broadcasts the V2X message.

S16. The receiving end monitors the V2X message.

It should be understood that the V2X layer of the receiver will filter the V2X message broadcast by the sender according to the first L2 ID. When the target L2 ID carried in the V2X message broadcast by the sender is the same as the first L2 ID, the V2X layer of the receiver will receive the V2X message and upload the V2X message to the application layer.

Currently, technical specification (TS) 24.587 stipulates that V2X terminals enable the receiving function throughout the entire process to monitor messages broadcast by other surrounding terminals. However, if the V2X terminal has the receiving function enabled throughout the entire process, it will consume a lot of power. Some V2X terminals have limited battery capacity, and if these V2X terminals continue to work with large power consumption, the normal working time of these V2X terminals will be short. Therefore, for these V2X terminals with limited battery capacity, how to reduce the power consumption of the V2X terminals is a computational problem to be solved urgently.

In order to solve this technical problem, an embodiment of the present application provides a communication method, which can be applied to various communication systems, such as: long-term evolution (long time evolution, LTE) system, LTE frequency division duplex (frequency division duplex) , FDD) system, LTE time division duplex (TDD) system, universal mobile telecommunication system (UMTS), worldwide interoperability for microwave access (WiMAX) communication system, public terrestrial Mobile network (public land mobile network, PLMN) system, device to device (D2D) network system or machine to machine (M2M) network system or new radio (new radio, NR) system or fifth 5th generation (5G) network system and future network systems, etc.

In this embodiment of the present application, the V2X terminal with limited battery capacity may refer to a vulnerable road user (vulnerable road user, VRU) terminal. VRUs include but are not limited to pedestrians, bicycles, electric vehicles, motorcycles, skateboards and other non-automotive road traffic participants.

The network architecture and service scenarios described in the embodiments of the present application are for the purpose of illustrating the technical solutions of the embodiments of the present application more clearly, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. The evolution of the architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems. In the embodiments of this application, the provided method is used in an NR system or a 5G network as an example for description.

As shown in FIG. 2, an architecture diagram of a communication system is provided, and the communication system may include terminals (for example, UE A, UE B, UE C, and UE D in FIG. 2), access network equipment, core network equipment, Data network (DN), etc.

A terminal may be called a user equipment (user equipment, UE) or a terminal device (terminal). The terminal may be installed with a V2X application. The terminal can support V2X communication, such as: receiving or sending V2X messages, in this case, the terminal can also be called a V2X terminal. The V2X messages may include but are not limited to vehicle-to-vehicle (V2V) messages, vehicle-to-person (V2P) messages, vehicle-to-network (V2N) messages, vehicles and road infrastructure (vehicle to infrastructure, V2I) information, anti-collision messages between cars, entertainment application messages, navigation messages interacting between cars, etc. Obviously, the terminals shown in FIG. 2 may include but are not limited to VRU terminals, vehicle-mounted terminals, mobile phones (mobile phones), tablet computers or computers with wireless transceiver functions, smart gas stations, smart signal lights, and the like.

In this embodiment of the present application, the terminal may transmit V2X messages through different types of communication interfaces. Wherein, the communication interface may include a PC5 port and/or a Uu port. The Uu interface is a wireless connection interface between a terminal and an access network device. The PC5 interface is the reference point for the ProSe direct communication on the user plane of the V2X service between terminals.

Access network equipment is responsible for radio resource management, uplink and downlink data classification and QoS application, as well as signaling processing with control plane network elements, and data forwarding with user plane network elements. For example, the access network device may be a base station, a broadband network gateway (BNG), an aggregation switch, a non-3GPP access device, and the like. The base station may include various forms of base stations, such as: a macro base station, a micro base station (also referred to as a small cell), a relay station, an access point, etc., which are not specifically limited in this embodiment of the present application. The equipment for the terminal to access the core network is collectively referred to as the access network equipment in the text, and will not be described again. For example, the access network device may be an evolved universal terrestrial radio access network (E-UTRAN) device in a 4G network, a next generation radio access network (next generation radio access network) in a 5G network , NG-RAN) equipment, etc.

Referring to Figure 2, core network equipment may include access and mobility management function (AMF), policy control function (PCF), unified data management (UDM), session management function (session management function, SMF), user plane function (user plane function, UPF), application function (application function, AF), network development function (network exposure function, NEF), and user data repository (user data repository, UDR). The functions of network elements such as AMF, PCF, and UDM can refer to the prior art, and details are not repeated here.

It should be noted that the network composed of operator network elements other than the RAN can become the core network. In the 4G network, the core network includes network elements such as MME, S-GW, P-GW, and HSS; in the 5G network, The core network includes network elements such as AMF, SMF, UPF, UDM, and PCF.

As shown in FIG. 3 , which is a schematic diagram of a protocol layer of a terminal, the protocol layer of the terminal can support the terminal to transmit V2X messages. The protocol layer of the terminal may include: an application layer (application layer), a V2X layer, and an access layer (Access Stratum, AS).

Among them, the application layer is mainly used to provide V2X services, such as generating V2X messages.

The V2X layer is mainly used to determine the communication interface of the V2X message, etc., to determine the communication mode of the V2X message on the PC5 interface, the establishment of the PC5 unicast connection, and the determination of the layer 2 identifier of the PC5 communication. Among them, the V2X layer of the terminal can be independently deployed in the terminal, or can be deployed in other protocol layers of the terminal, such as: can be deployed in the non-access stratum (NAS) of the terminal (not shown in Figure 3) middle. When the V2X layer is deployed in the NAS, the actions performed by the V2X layer can be considered to be performed by the NAS, without limitation. The embodiment of the present application is described by taking the V2X layer of the terminal independently deployed in the terminal as an example, which is not limited.

AS is mainly used to support processes such as public land mobile network (PLMN) selection, cell selection, and resourceless resource management. Exemplarily, the radio resource management procedure includes: a radio resource control (radio resource control, RRC) connection establishment procedure, a signaling establishment procedure between the terminal and the core network, a handover procedure, and the like. For PC5 port communication, the AS also applies for PC5 communication resources for V2X messages sent by the PC5 port, fills in the source layer 2 address and destination layer 2 address for the V2X message, and establishes a PC5-RRC connection for PC5 unicast communication.

In this embodiment of the present application, the application layer may be referred to as the upper layer of the V2X layer, and the access layer may be referred to as the lower layer of the V2X layer.

FIG. 4 is a schematic diagram of the composition of a communication apparatus 100 according to an embodiment of the present application, and the communication apparatus 100 may be a terminal or a chip or a system-on-chip in the terminal. The communication device 100 includes a processor 101 , a communication line 102 and a communication interface 103 .

Further, the communication apparatus 100 may further include a memory 104 . The processor 101 , the memory 104 and the communication interface 103 may be connected through a communication line 102 .

The processor 101 may be a central processing unit (CPU), a general-purpose processor, a network processor (NP), a digital signal processing (DSP), a microprocessor, or a microcontroller. , programmable logic device (PLD) or any combination of them. The processor 101 may also be any other device having processing functions, such as a circuit, a device or a software module, without limitation.

The communication line 102 is used to transmit information between components included in the communication device 100 .

The communication interface 103 is used to communicate with other devices or other communication networks. The other communication network may be Ethernet, radio access network (RAN), wireless local area networks (WLAN) and the like. Communication interface 103 may be a module, circuit, transceiver, or any device capable of communication.

Memory 104 for storing instructions. Wherein, the instructions may be computer programs.

The memory 104 may be a read-only memory (ROM) or other types of static storage devices capable of storing static information and/or instructions, or may be a random access memory (RAM) or a storage device capable of storing static information and/or instructions. Other types of dynamic storage devices for information and/or instructions, which may also be electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) ) or other optical disc storage, optical disc storage (including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, etc., without limitation.

It should be pointed out that the memory 104 may exist independently of the processor 101 , or may be integrated with the processor 101 . The memory 104 may be used to store instructions or program code or some data or the like. The memory 104 may be located in the communication device 100, or may be located outside the communication device 100, which is not limited.

The processor 101 is configured to execute the instructions stored in the memory 104 to implement the communication methods provided by the following embodiments of the present application. For example, when the communication device 100 is a terminal or a chip or a system-on-chip in the terminal, the processor 101 may execute the instructions stored in the memory 104 to implement the steps performed by the sender in the following embodiments of the present application.

In one example, the processor 101 may include one or more CPUs, such as CPU0 and CPU1 in FIG. 4 .

As an optional implementation manner, the communication apparatus 100 includes multiple processors. For example, in addition to the processor 101 in FIG. 4 , the communication apparatus 100 may further include a processor 107 .

As an optional implementation manner, the communication apparatus 100 further includes an output device 105 and an input device 106 . Exemplarily, the input device 106 is a device such as a keyboard, a mouse, a microphone or a joystick, and the output device 105 is a device such as a display screen, a speaker, and the like.

The terms mentioned in this application are introduced below.

1. Receive mode

The receiving mode is used to control the receiving behavior of the terminal.

For example, the receiving mode may be the complete receiving mode provided by the current TS 24.587, or the incomplete receiving mode provided by the embodiment of the present application, or the suspended receiving mode provided by the embodiment of the present application.

Among them, the complete receiving mode is used for the terminal to continuously receive data on the PC5 port. In other words, the full receive mode can be used for the terminal to continuously enable the receive function on the PC5 port.

The incomplete receive mode is used for the terminal to receive data on the PC5 port within the receive window of the receive cycle. In other words, the incomplete receiving mode can be used for the first terminal to enable the receiving function on the PC5 port within the receiving window of the receiving period. Wherein, enabling the receiving function on the PC5 port may refer to: enabling the function of the access layer and the non-access layer to receive data on the PC5 port.

It should be noted that the receiving period is composed of a receiving window and a non-receiving window. Among them, the receive window is the time period during which data is allowed to be received on the PC5 port within the receive cycle, and data is not allowed to be received on the PC5 port outside the receive window time period. The non-receiving window is the time period during which data is not allowed to be received on the PC5 port during the receiving cycle.

Taking FIG. 5 as an example, it is assumed that the duration of the receiving cycle is set to 2s, and the duration of the receive window is set to 1s. Receive cycle #1 consists of receive window #1 and non-receive window #1. Reception cycle #2 consists of reception window #2 and non-reception window #2. Receive cycle #3 consists of receive window #3 and non-receive window #3. The terminal enables the receiving function on the PC5 port on the receiving window #1, receiving window #2, and receiving window #3, and disables the receiving function on the PC5 port on the non-receiving window #1, non-receiving window #2, and non-receiving window #3. Function.

The pause receiving mode is used for the terminal to pause receiving data on the PC5 port.

It should be understood that the names of the complete reception mode, the incomplete reception mode, and the paused reception mode are only examples, and these reception modes may have other names, which are not limited in this embodiment of the present application.

2. V2X application

V2X applications may refer to applications that receive or send V2X messages. For example, the terminal installs application 1, application 2, and application 3. If application 1 is used to receive or send V2X messages, then application 1 belongs to a V2X application. If application 2 and application 3 are not used for receiving and sending V2X messages, then application 2 and application 3 do not belong to V2X applications.

It should be understood that whether an application is used to receive and send V2X messages may depend on factors such as a usage scenario of the terminal, user requirements of the terminal, and the like. For example, the user of the vehicle terminal starts the application 1 and triggers the application 1 to enter the driving mode. At this time, the application 1 receives or sends the V2X message. After the user arrives at the destination, the user of the vehicle terminal closes the application 1, and the application 1 does not receive or send V2X messages at this time.

It should be understood that one or more V2X applications may be installed on a terminal.

Optionally, the application may indicate to the V2X layer of the terminal whether to receive or send a V2X message. When the application instructs the V2X layer of the terminal to receive or send a V2X message, the V2X layer of the terminal determines the application as a V2X application.

Optionally, the V2X layer of the terminal may store the identifier of each V2X application on the terminal.

The technical solutions provided by the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 6 , a communication method provided by an embodiment of the present application includes the following steps:

S101. The first terminal switches from the first receiving mode to the second receiving mode.

Exemplarily, the first terminal may be a VRU terminal or other V2X terminal that needs to reduce power consumption, which is not limited.

Wherein, the first receiving mode may be the full receiving mode mentioned in the above-mentioned receiving mode. The first receiving mode can be used for the first terminal to continuously receive data on the PC5 port. In other words, the first receiving mode can be used for the first terminal to continuously enable the receiving function on the PC5 port.

The second reception mode may be the incomplete reception mode mentioned in the above-mentioned reception modes. The second receiving mode can be used for the first terminal to receive data on the PC5 port within the receiving window of the receiving period. In other words, the second receiving mode can be used for the first terminal to enable the receiving function on the PC5 port within the receiving window of the receiving period.

As a possible implementation manner, when the first terminal has no security risk, the first terminal switches from the first receiving mode to the second receiving mode.

It should be understood that when the first terminal switches to the second receiving mode without a security risk, the purpose of taking both security and power saving into consideration can be achieved.

In the embodiment of the present application, the first terminal in the second receiving mode receives data on the PC5 port within the receiving window of each receiving period, so that the first terminal can receive messages sent by other surrounding terminals. The first terminal in the second receiving mode suspends receiving data on the PC5 port during the non-receiving window of each receiving cycle, so as to save the power consumption of the first terminal.

S102. The first terminal broadcasts the first information.

The first information is used to represent that the first terminal is in the second receiving mode.

Wherein, the source L2 ID used by the first information may be the L2 ID of the first terminal.

Optionally, the destination L2 ID used by the first information is the L2 ID corresponding to the first information preconfigured by the first terminal.

The first information may include user information of the first terminal.

Optionally, the first information further includes one or more of the following parameters: duration of the reception period, duration of the reception window, start time of the reception window, start time of the reception period, or reception mode information.

The starting time of the receiving window or the starting time of the receiving period may be the coordinated universal time (coordinated universal time, UTC) time or the time served by the global navigation satellite system (Global Navigation Satellite System, GNSS).

The reception mode information may be used to indicate the reception mode used or located by the first terminal. That is, when the first terminal is in the first reception mode, the reception mode information is used to indicate that the first terminal is in the first reception mode. Alternatively, when the first terminal is in the second reception mode, the reception mode information is used to indicate that the first terminal is in the second reception mode. Alternatively, when the first terminal is in the third reception mode, the reception mode information is used to indicate that the first terminal is in the third reception mode.

Wherein, the third receiving mode may be the suspended receiving mode mentioned in the above-mentioned receiving mode. The third receiving mode is used for the first terminal to suspend receiving data on the PC5 port.

It can be seen that, for the first terminal to switch from the first receiving mode to the second receiving mode in step S101, the above-mentioned receiving mode information can be used to indicate the second receiving mode, that is, the first terminal is in the second receiving mode.

Optionally, the first information may be a V2X message or a PC5 signaling message.

Exemplarily, in the case where the first information is a V2X message, the first information may be a vulnerable road user awareness message (VRU awareness message, VAM) or a pedestrian safety message (personal safety message, PSM), etc., which is not limited here. .

It should be understood that when the first information is a V2X message, the application layer of the first terminal generates the first information. When the first information is a PC5 signaling message, the V2X layer of the first terminal generates the first information.

As a possible implementation manner, the first terminal periodically broadcasts the first information.

Optionally, the first terminal broadcasts the first information one or more times in each receiving period.

Optionally, the first terminal broadcasts the first information within the receiving window of each receiving period. In this way, the sending and receiving operations of the first terminal are controlled within the same time period, which is beneficial to reduce the power consumption of the first terminal.

S103. The second terminal receives the first information.

The second terminal may be a vehicle (vehicle) terminal, a VRU terminal, or a roadside unit (road side unit, RSU) terminal.

S104. The second terminal determines, according to the first information, that the first terminal is in the second receiving mode.

Optionally, since the source L2 ID used by the first information is the L2 ID of the first terminal, the second terminal can obtain the L2 ID of the first terminal after receiving the first information. The second terminal may store the L2 ID of the first terminal in the first list. The first list is used to store the L2 IDs of the terminals in the second reception mode.

It should be understood that when the second terminal determines that the first terminal is not in the second receiving mode, the second terminal deletes the L2 ID of the first terminal from the first list.

It should be noted that the second terminal can determine whether a terminal is in the second receiving mode by querying whether the L2 ID of a terminal exists in the first list. That is, when the L2 ID of a terminal exists in the first list, the second terminal can determine that the terminal is in the second receiving mode; when the L2 ID of a terminal does not exist in the first list, the second terminal can determine that the terminal is in the second receiving mode. Not in second receive mode.

Optionally, after the second terminal receives the first information, the V2X layer of the second terminal may establish and store the correspondence between the user information of the first terminal and the L2 ID of the first terminal. In this way, after the V2X layer of the second terminal receives the V2X service data sent by the application layer of the second terminal and the user information of the first terminal, the V2X layer of the second terminal can determine the first terminal according to the user information of the first terminal. The L2 ID of a terminal. Therefore, the V2X layer of the second terminal can send the V2X service data to the first terminal according to the L2 ID of the first terminal.

Optionally, when the first information includes receiving window configuration information of the first terminal (for example, the duration of the receiving period, the duration of the receiving window, the starting time of the receiving window and/or the starting time of the receiving period), the first The second terminal stores the receiving window configuration information of the first terminal. In this way, in the subsequent process, the second terminal can send a message (for example, a second message) to the first terminal within the receiving window of the first terminal according to the receiving window configuration information of the first terminal, so as to ensure that the first terminal can The message sent by the second terminal is received within the receiving window of the first terminal.

Based on the embodiment shown in FIG. 6 , since the first terminal switches from the first receiving mode to the second receiving mode, the first terminal only receives data on the PC5 port within the receiving window, thereby reducing the time required for the first terminal to receive messages , reducing the power consumption of the first terminal. In addition, the first terminal broadcasts the first information, so that other terminals around the first terminal can know that the first terminal is in the second receiving mode, and other terminals around the first terminal can send messages to the first terminal at an appropriate time to avoid the first terminal. The terminal does not receive important messages sent by other surrounding terminals. The purpose of taking into account the security and power saving of the first terminal is achieved.

The following will specifically describe an implementation manner of the first terminal switching from the first receiving mode to the second receiving mode with reference to FIG. 7 , FIG. 8( a ) or FIG. 8( b ).

As shown in FIG. 7, a communication method provided by an embodiment of the present application includes the following steps S201-S204. It should be understood that step S101 in FIG. 6 can be implemented by adopting steps S203 and S204 in FIG. 7 .

S201. The application layer of the first terminal determines to switch the first terminal from the first receiving mode to the second receiving mode.

As a possible implementation manner, the application layer of the first terminal determines that there is no security risk in the first terminal.

Optionally, the application layer of the first terminal may determine whether there is a security risk in the first terminal according to the embodiment shown in FIG. 9 .

It should be noted that, in S201, the first terminal is currently in the first receiving mode, and is about to switch to the second receiving mode. For the first receiving mode and the second receiving mode, reference may be made to the relevant descriptions in the embodiment shown in FIG. 6 , and details are not repeated here.

S202. The application layer of the first terminal sends third information to the V2X layer of the first terminal.

The third information is used to switch the first terminal to the second receiving mode.

Optionally, the third information is an attention command (attention command, AT command). Among them, the AT command is a standard command sent by the application layer to the wireless layer (for example, the V2X layer).

The third information may include user information of the first terminal. The user information of the first terminal may refer to user information of the V2X application of the first terminal, such as account information of the V2X application, user number of the first terminal, number allocated by the V2X application for the user to participate in traffic, and the like. The user information of the first terminal may have other names, such as an application layer identifier of the first terminal.

In this embodiment of the present application, since the third information includes user information of the first terminal, the V2X layer of the first terminal can obtain the user information of the first terminal. Furthermore, when the first information needs to be sent, the V2X layer of the first terminal may determine the L2 ID of the first terminal according to the user information of the first terminal. Furthermore, the V2X layer of the first terminal may use the L2 ID of the first terminal as the source L2 ID used by the first information. In addition, when the first information is a PC5 signaling message, the V2X layer of the first terminal may encapsulate the user information of the first terminal in the first information.

Optionally, the third information further includes: configuration parameters of the second receiving mode. Wherein, the configuration parameters of the second reception mode include at least the duration of the reception cycle and the duration of the reception window.

Further, the configuration parameters of the second reception mode may further include the start time of the reception period and/or the start time of the reception window.

In an example, the application layer of the first terminal may determine the duration of the reception period and/or the duration of the reception window according to factors such as the traffic environment where the first terminal is located. Exemplarily, assuming that the application layer of the first terminal determines that there is no vehicle within 200m of the first terminal, the application layer of the first terminal may determine that the duration of the reception period is 3s and the duration of the reception window is 1s. In this way, even if the first terminal does not receive a message about the occurrence of the vehicle within 2 seconds, the vehicle generally travels a distance of 60m-80m within 2 seconds, so the distance between the vehicle and the first terminal is still greater than 120m. In this way, after the first terminal receives the message sent by the vehicle in the receiving window, if the first terminal determines that there is a collision risk between the vehicle and the first terminal according to the message sent by the vehicle, the first terminal immediately notifies the user of the first terminal, It is ensured that the user of the first terminal has sufficient response time to perform correct operations, and the safety of the user of the first terminal is ensured.

Optionally, since the current minimum frequency for sending messages by the V2X terminal is generally 1 Hz, in order to ensure that the first terminal can receive V2X messages from all V2X terminals around the first terminal within the receiving window, the application layer of the first terminal can set The duration of the receive window is greater than or equal to 1s.

Exemplarily, the duration of the receiving window used by the first terminal is set to 1s, and the receiving period is set to 2s, so as to take into account the security and power saving of the first terminal.

S203. The V2X layer of the first terminal receives the third information.

S204. The V2X layer of the first terminal instructs the access layer of the first terminal to switch to the second reception mode according to the third information.

As a possible implementation manner, the V2X layer of the first terminal determines the configuration parameters of the second reception mode, and sends seventh information to the access layer of the first terminal, where the seventh information is used to trigger the access layer of the first terminal Switching to the second receiving mode, the seventh information includes configuration parameters of the second receiving mode.

Correspondingly, the access layer of the first terminal may determine the duration of the reception period of the first terminal and the duration of the reception window of the first terminal according to the seventh information. Thus, the access layer of the first terminal receives data on the PC5 port in the receiving window of each receiving cycle according to the duration of the receiving period of the first terminal and the duration of the receiving window of the first terminal, and Suspend receiving data on the PC5 port within the receiving window.

Optionally, the V2X layer of the first terminal determines the configuration parameters of the second reception mode, and can adopt any one of the following methods:

Manner 1: When the third information includes configuration parameters of the second reception mode, the V2X layer of the first terminal may determine the configuration parameters of the second reception mode according to the third information.

Manner 2: The V2X layer of the first terminal acquires the preconfigured configuration parameters of the second reception mode from the database.

Optionally, the duration of the pre-configured reception period and the duration of the reception window may be related to the geographic location where the first terminal is located. For example, the first terminal is located in the city center, the pre-configured duration of the reception period is 2s, and the duration of the reception window is 1s. The first terminal is located in a suburb, the preconfigured duration of the reception period is 3s, and the duration of the reception window is 0.5s.

Optionally, the start time of the receive window may be the same as the start time of the receive cycle. In this way, it is not necessary to additionally configure the start time of the receive window.

Optionally, the start time of the receiving window may be calculated according to the time domain offset value of the receiving window. The time domain offset value of the receiving window refers to the difference between the start time of the first receiving window in the target time period and the start time of the target time period. Exemplarily, the target time period may be an integer number of seconds.

In a possible design, the time domain offset value of the receiving window is calculated according to the L2 ID of the first terminal and the duration of the receiving cycle. Exemplarily, for the calculation formula of the time-domain offset value of the receiving window, reference may be made to the following formula (1).

K=mod(P, Q) Formula (1)

Among them, K represents the time domain offset value of the receiving window. P represents the L2 ID of the first terminal in decimal. Q represents the duration of the receive cycle.

For example, the duration of the receive window is 100ms, the duration of the receive cycle is 200ms, and the L2ID of the first terminal is 10006394. Therefore, the time domain offset value can be calculated as mod(10006394,200)=194. Assuming that the current time is 20:08:55:362 (that is, 20:08:55 seconds and 162 milliseconds), then within the range of 20:08:55 seconds, the start time of the first receive window is 20:08 :55:194, the end time of the first receive window is 20:08:55:294; the start time of the second receive window is 20:08:55:394, and the end time of the second receive window is 20: 08:55:494; The start time and end time of the next receive window can be derived by analogy.

It should be understood that, in the case where the start time of the receiving window can be calculated according to the time domain offset value of the receiving window, the first information may not include the starting time of the receiving window, thereby helping to reduce the overhead of the first information.

In the embodiment of the present application, the access layer of the first terminal switches to the second receiving mode, which may be specifically implemented as follows: the access layer of the first terminal, according to the duration of the reception window and the duration of the reception period, switches the access layer of the first terminal in the reception window of the reception period Receive data on the PC5 port, and suspend receiving data on the PC5 port within the non-receiving window of the receiving cycle.

Using the embodiment shown in FIG. 7 , the V2X layer of the first terminal instructs the access layer of the first terminal to switch from the first receiving mode to the second receiving mode according to the third information sent by the application layer of the first terminal, which is successfully implemented. The first terminal switches from the first receiving mode to the second receiving mode to save power consumption.

As shown in FIG. 8( a ), an embodiment of the present application provides a communication method, and the method includes the following steps S301-S303. It should be understood that step S101 in FIG. 6 may adopt step S303 in FIG. 8(a).

S301. The target V2X application of the first terminal determines to switch from the first receiving mode to the second receiving mode.

The target V2X application may be any one of M V2X applications installed by the first terminal, where M is a positive integer. Exemplarily, the target V2X application is Baidu Map or AutoNavi Map.

In a possible design, the M V2X applications may refer to all V2X applications installed on the first terminal.

In another possible design, the M V2X applications may refer to specific applications among all V2X applications installed on the first terminal, such as security V2X applications.

S302. The target V2X application of the first terminal sends third information to the V2X layer of the first terminal.

The third information may include an identifier of the target V2X application, where the identifier is used to identify the target V2X application.

For the relevant description of the third information, reference may be made to the foregoing description, which will not be repeated here.

Exemplarily, the V2X layer of the first terminal stores the third information sent by the target V2X application. The V2X layer of the first terminal sets a timer corresponding to the target V2X application. When the timer corresponding to the target V2X application times out, the V2X layer of the first terminal determines that the currently stored third information sent by the target V2X application is invalid. The third information is invalid, which is equivalent to that the V2X layer of the first terminal does not receive the third information.

Optionally, in some scenarios, the target V2X application of the first terminal sends fourth information to the V2X layer of the first terminal, and the fourth information is used by the V2X layer of the first terminal to switch the first terminal to the first receiving mode. Further, the V2X layer of the first terminal may delete the third information sent by the target V2X application from the cache.

It should be understood that the above steps S301-S302 can all be performed by the M V2X applications of the first terminal.

S303. The V2X layer of the first terminal instructs the access layer of the first terminal to switch to the second reception mode according to the third information.

The specific implementation of step S303 may refer to the description of step S204, which will not be repeated here.

Using the embodiment shown in FIG. 8( a ), the V2X layer of the first terminal instructs the AS layer of the first terminal to switch from the first receiving mode to the second receiving mode according to the third information sent by the target V2X application of the first terminal , the switching of the first terminal from the first receiving mode to the second receiving mode is successfully implemented to save power consumption.

Optionally, considering that the first terminal switches from the first receiving mode to the second receiving mode only according to the instruction of one target V2X application, normal use of other V2X applications among the M V2X applications may be affected. In order to solve this technical problem, step S303 in the embodiment shown in FIG. 8( a ) can be replaced with step S304 in the embodiment shown in FIG. 8( b ).

S304. When the V2X layer of the first terminal receives the third information sent by each of the M V2X applications in the first terminal, the V2X layer of the first terminal instructs the access layer of the first terminal to switch to the second receiving layer model.

Since the M V2X applications may not send the third information at the same time, the V2X layer of the first terminal can determine whether to receive the third information sent by the M V2X applications by judging whether the third information sent by the M V2X applications is cached. third information.

That is, when the V2X layer of the first terminal buffers the third information sent by the M V2X applications, the V2X layer of the first terminal determines to receive the third information sent by the M V2X applications. On the contrary, the V2X layer of the first terminal determines that the third information sent by the M V2X applications has not been received.

The specific implementation manner of the V2X layer of the first terminal instructing the access layer of the first terminal to switch to the second reception mode may refer to the description of step S204, which will not be repeated here.

Optionally, when the M third pieces of information all include the duration of the reception period, the V2X layer of the first terminal takes the maximum duration of the reception period as the duration of the reception period used in the second reception mode.

Optionally, when the M third pieces of information all include the duration of the reception window, the V2X layer of the first terminal uses the minimum duration of the reception window as the duration of the reception window used in the second reception mode.

Using the embodiment shown in FIG. 8(b), in the case that all V2X applications in the first terminal instruct to switch to the second receiving mode, the V2X layer of the first terminal instructs the AS layer of the first terminal to switch to the second receiving mode from the first receiving mode Switch to the second receive mode. On the one hand, the power consumption of the first terminal is reduced; on the other hand, the normal use of the M V2X applications installed on the first terminal is ensured.

As shown in FIG. 9, an embodiment of the present application provides a method for determining a security risk. The following describes whether there is a security risk in the first terminal as an example, and the security risk judgment mentioned in this application can all use this method, without limitation. The method includes the following steps:

S401. The first terminal acquires motion information of at least one second terminal.

The second terminal may be a vehicle terminal or a VRU terminal.

The movement information of the second terminal may include at least one of the following information: the position of the second terminal, the speed of the second terminal, the movement direction of the second terminal, the turning angle of the second terminal, and/or the second terminal the predicted motion trajectory.

Optionally, based on the V2X scenario, the motion information may also have other names, such as driving information.

In a possible implementation manner, the first terminal acquires motion information of at least one second terminal within a preset time period. And/or, the first terminal acquires motion information of at least one second terminal in the target geographic area. Optionally, the target geographic area may be an area centered on the first terminal.

Based on this, the motion information of the at least one second terminal can effectively reflect the current traffic conditions of the first terminal period, so that the first terminal can accurately determine whether the first terminal has a safety risk.

In this embodiment of the present application, the first terminal receives the V2X message broadcast by the second terminal. Afterwards, the first terminal may determine the motion information of the second terminal from the V2X message.

Exemplarily, the V2X message broadcast by the second terminal may be decentralized environmental notification message (DENM), basic safety message (basic safety message, BSM), cooperative awareness message (cooperative awareness message, CAM), etc., This is not limited.

S402. The first terminal acquires motion information of the first terminal.

The movement information of the first terminal may include at least one of the following information: the position of the first terminal, the speed of the first terminal, the movement direction of the first terminal, the turning angle of the first terminal, and/or the first terminal the predicted motion trajectory.

As a possible implementation manner, during the movement of the first terminal, a sensor of the first terminal (for example, a position sensor, an acceleration sensor, etc.) can detect corresponding data, and the first terminal processes the data detected by the sensor , the motion information of the first terminal can be determined.

This embodiment of the present application does not limit the execution order of step S401 and step S402. That is, step S401 may be performed first, and then step S402 may be performed; or step S402 may be performed first, and then step S401 may be performed; or, steps S401 and S402 may be performed simultaneously.

S403. The first terminal determines whether the first terminal has a security risk according to the motion information of the first terminal and the motion information of at least one second terminal.

As a possible implementation manner, for each second terminal in the at least one second terminal, the first terminal determines whether the second terminal satisfies the first terminal according to the motion information of the first terminal and the motion information of the second terminal. preset conditions. When each of the at least one second terminal satisfies the preset condition, the first terminal determines that the first terminal does not have a security risk. On the contrary, the first terminal determines that the first terminal has a security risk.

Taking the first terminal as terminal 1 and the at least one second terminal as terminal 2 and terminal 3 as an example, terminal 1 obtains the motion information of terminal 1, the motion information of terminal 2, and the motion information of terminal 3. The terminal 1 determines whether the terminal 2 satisfies the first preset condition according to the motion information of the terminal 1 and the motion information of the terminal 2. The terminal 1 determines whether the terminal 3 satisfies the first preset condition according to the motion information of the terminal 1 and the motion information of the terminal 3 . When both the terminal 2 and the terminal 3 satisfy the first preset condition, the terminal 1 determines that it does not have a security risk. When any one of the terminal 2 and the terminal 3 does not meet the first preset condition, the terminal 1 determines that it has a security risk.

Optionally, the first preset condition includes one or a combination of the following:

(1) The relative distance between the first terminal and the second terminal is greater than or equal to the first preset value.

(2) The relative speed between the first terminal and the second terminal is less than or equal to the second preset value.

(3) The confidence of the transmission collision between the first terminal and the second terminal is less than or equal to the third preset value.

(4) There is no intersection between the predicted motion trajectory of the first terminal and the predicted motion trajectory of the second terminal.

It should be understood that the first preset condition may also have other implementation manners, which are not limited in this embodiment of the present application.

The above-mentioned first preset value, second preset value and third preset value may be pre-configured, specifically may be configured by the network, or may be pre-set in the terminal. Specifically, the setting values of the first preset value, the second preset value and the third preset value may be specified by the communication protocol, or may be the first terminal based on its own hardware configuration, traffic environment, geographic location and other factors to be sure.

Based on the embodiment shown in FIG. 9 , the first terminal can determine whether other surrounding terminals pose a security threat to the first terminal according to the motion information of the first terminal and the motion information of other surrounding terminals (ie, the second terminal). Therefore, in the case that no other surrounding terminals pose a security threat to the first terminal, the first terminal can determine that the first terminal does not have a security risk.

Optionally, the steps in the embodiment shown in FIG. 9 may be performed by the application layer of the first terminal or the V2X application of the first terminal.

A specific implementation solution for switching the first terminal in the second receiving mode to the first receiving mode will be described in detail below with reference to FIG. 10 and FIG. 11 . The embodiments shown in FIGS. 10 and 11 may be combined with any one of the embodiments shown in FIGS. 6 , 7 , 8( a ) and 8 ( b ) without limitation.

As shown in FIG. 10 , a communication method provided by an embodiment of the present application includes the following steps:

S501. The application layer of the first terminal determines to switch the first terminal from the second receiving mode to the first receiving mode.

In a possible implementation manner, when the first terminal is in the second receiving mode, when the application layer of the first terminal determines that the first terminal has a security risk, the application layer of the first terminal determines to transfer the first terminal from the first terminal to the first terminal. The second receiving mode is switched to the first receiving mode.

It should be understood that the first terminal switches to the first receiving mode when there is a security risk, so as to ensure that the first terminal can obtain information sent by other terminals in a timely manner, so that the first terminal can timely understand the traffic conditions of the period, and improve the first terminal. End-user security.

For the first receiving mode and the second receiving mode, reference may be made to the relevant descriptions in the foregoing embodiments, and details are not repeated here.

Specifically, the first terminal is currently in the second receiving mode, and the application layer of the second terminal determines to switch the first terminal to the first receiving mode.

S502. The application layer of the first terminal sends fourth information to the V2X layer of the first terminal.

The fourth information is used to switch the first terminal to the first receiving mode.

Optionally, the fourth information is AT command.

S503. The V2X layer of the first terminal receives the fourth information.

S504. The V2X layer of the first terminal instructs the access layer of the first terminal to switch the first to the first receiving mode according to the fourth information.

As a possible implementation, the V2X layer of the first terminal sends eighth information to the access layer of the first terminal according to the fourth information, where the eighth information is used to instruct the access layer of the first terminal to switch to the first receiving mode . Therefore, the access layer of the first terminal switches to the first reception mode according to the eighth information.

Based on the embodiment shown in FIG. 10 , in some scenarios (for example, the first terminal senses that there is a security risk in the surroundings), the first terminal can actively switch to the first receiving mode, so that the first terminal can receive other surrounding terminals in time. The information sent, timely understand the surrounding traffic conditions, and ensure the safety of the users of the first terminal.

Optionally, in the embodiment shown in FIG. 10 , "the application layer of the first terminal" may be replaced with "the V2X application of the first terminal".

As shown in FIG. 11 , a communication method provided by an embodiment of the present application includes the following steps:

S601. The second terminal determines to switch the first terminal in the second receiving mode to the first receiving mode.

As a possible implementation manner, when the second terminal determines that the first terminal in the second reception mode has a security risk, the second terminal determines to switch the first terminal in the second reception mode to the first reception mode.

Optionally, the second terminal determines that the first terminal in the second receiving mode has a security risk, including one of the following situations:

Scenario 1. The second terminal determines that the second terminal is in a runaway state. Exemplarily, the fact that the second terminal is out of control may refer to: the vehicle has an accident (for example, a tire blowout, brake failure, etc.), the automatic driving system of the vehicle is faulty, the movement trajectory of the vehicle is abnormal, the vehicle violates traffic rules (running a red light, speeding, occupation of non-motorized lanes, dangerous driving, etc.). The above-mentioned vehicle refers to the second terminal or a vehicle equipped with the second terminal.

Scenario 2: The second terminal acquires the motion information of the first terminal. After that, the second terminal determines that the second terminal does not meet the first preset condition according to the motion information of the first terminal and the motion information of the second terminal. For the specific description of the first preset condition, reference may be made to the foregoing description, which will not be repeated here.

S602. The second terminal sends the second information to the first terminal.

The second information is used to switch the first terminal to the first receiving mode. Alternatively, the second information is used to represent that the first terminal has a security risk.

In this embodiment of the present application, the destination L2 ID used by the second information is the L2 ID of the first terminal.

Optionally, the second information further includes user information of the first terminal. The purpose is to enable the terminal monitoring the second information to verify whether it is the receiving end of the second information according to the user information of the first terminal included in the second information.

Optionally, the second information may be a V2X message or a PC5 signaling message.

Optionally, step S602 may adopt any one of the following implementation manners:

Implementation Mode 1: In the case that the first information sent by the first terminal includes the duration of the reception period of the first terminal and the duration of the reception window of the first terminal, the second terminal uses the first duration as the first duration in the first time period. The transmission time interval, and the fourth information is repeatedly transmitted. The duration of the first time period is greater than or equal to the duration of the reception period. The first duration is less than or equal to the duration of the receive window.

Implementation Mode 2: In the case where the first information sent by the first terminal includes the duration of the reception period of the first terminal and the duration of the reception window of the first terminal, the second terminal can use the duration of the reception period and the L2 of the first terminal according to ID to determine the time domain offset value of the receiving window; the second terminal determines the start time of the receiving window of the first terminal according to the time domain offset value; the second terminal determines the starting time of the receiving window and the duration of the receiving window according to the The second information is sent to the first terminal within the receiving window of the first terminal.

The calculation formula of the time domain offset value of the receiving window may refer to the above formula (1).

It should be understood that implementation mode 2 is applicable to the scenario where the start time of the receiving window used by the first terminal is calculated according to the time domain offset value of the receiving window.

Implementation Mode 3: In the case where the first information sent by the first terminal includes the start time of the receiving window of the first terminal and the duration of the receiving window of the first terminal, the second terminal can use the start time of the receiving window of the first terminal according to The start time and the duration of the receiving window of the first terminal are used, and the second information is sent to the first terminal within the receiving window.

Implementation Mode 4: The second terminal sends the second information within the receiving window of the first terminal according to the preconfigured duration of the receiving window of the first terminal and the start time of the receiving window.

It should be understood that the above implementation manners 1 to 4 may be performed by the V2X layer of the second terminal.

Optionally, the V2X layer of the second terminal may obtain the receiving window configuration information of the first terminal from the application layer of the second terminal, such as the duration of the receiving window, the duration of the receiving period, the start time of the receiving window, and the like.

Optionally, the V2X layer of the second terminal may pre-store the receiving window configuration information of the first terminal. For example, after receiving the first information, the second terminal stores the receiving window configuration information of the first terminal included in the first information.

S603. The first terminal switches to the first receiving mode according to the second information.

Based on the embodiment shown in FIG. 11 , the second terminal sends the second information to the first terminal, so that the first terminal switches from the second receiving mode to the first receiving mode. In this way, the first terminal can receive messages sent by other surrounding terminals in time, so as to know the traffic situation around the first terminal, so as to ensure the safety of the user of the first terminal.

Optionally, when the second information is a PC5 signaling message, the embodiment shown in FIG. 11 may be specifically implemented as the embodiment shown in FIG. 12 . Step S601 in FIG. 11 can be implemented by using step S701 in FIG. 12 , step S602 in FIG. 11 can be implemented by using steps S702-S704 in FIG. 12 , and step S603 in FIG. 11 can be implemented by using step S705 in FIG. 12 to realise.

As shown in FIG. 12 , a communication method provided by an embodiment of the present application includes the following steps:

S701. The application layer of the second terminal determines to switch the first terminal from the second receiving mode to the first receiving mode.

S702. The application layer of the second terminal sends sixth information to the V2X layer of the second terminal.

The sixth information is used to instruct the second terminal to generate the second information. The sixth information includes user information of the first terminal.

S703. The V2X layer of the second terminal generates the second information according to the sixth information.

It should be understood that since the first information received before the V2X layer of the second terminal includes the L2 ID of the first terminal and the user information of the first terminal, the V2X layer of the second terminal can establish the L2 ID of the first terminal and the first terminal. Correspondence between the user information of the terminal. Therefore, the V2X layer of the second terminal can determine the first terminal according to the user information of the first terminal included in the sixth information, and the pre-stored correspondence between the L2 ID of the first terminal and the user information of the first terminal 's L2 ID. Therefore, the V2X layer of the second terminal uses the L2 ID of the first terminal as the destination L2 ID used by the second information.

S704. The V2X layer of the second terminal sends the second information to the V2X layer of the first terminal.

S705. The V2X layer of the first terminal instructs the access layer of the first terminal to switch to the first receiving mode according to the second information.

As a possible implementation, the V2X layer of the first terminal sends eighth information to the access layer of the first terminal according to the second information, and the eighth information is used to instruct the access layer of the first terminal to switch to the first receiving mode . Therefore, the access layer of the first terminal switches to the first receiving mode according to the eighth information.

In this embodiment of the present application, the switching of the access layer of the first terminal to the first receiving mode may be implemented as follows: the access layer of the first terminal continues to receive data on the PC5 port. Here, a unified description is provided, and details are not repeated below.

Based on the technical solution shown in FIG. 12 , since the second information is a PC5 signaling message, the V2X layer of the first terminal has the ability to parse the PC5 signaling message. Therefore, after receiving the second information, the V2X layer of the first terminal can switch to the first receiving mode directly according to the second information.

Optionally, as shown in FIG. 12, the method further includes step S706 after step S705.

S706. The V2X layer of the first terminal may also send fifth information to the application layer of the first terminal.

Wherein, the fifth information is used to indicate that the first terminal has switched to the first receiving mode.

Based on step S706, the application layer of the first terminal may learn that the first terminal has switched to the first receiving mode.

Optionally, when the second information is a V2X message, the technical solution shown in FIG. 11 may be specifically implemented as the technical solution shown in FIG. 13 . Step S601 in FIG. 11 can be implemented by using step S801 in FIG. 13 , step S602 in FIG. 11 can be implemented by using steps S802-S803 in FIG. 13 , and step S603 in FIG. 11 can be implemented by using step S804 in FIG. 13 -S806 to achieve.

As shown in FIG. 13 , a communication method provided by an embodiment of the present application includes the following steps:

S801. The application layer of the second terminal determines to switch the first terminal from the second receiving mode to the first receiving mode.

The specific implementation of step S801 may refer to the description of step S701, which is not repeated here.

S802. The application layer of the second terminal sends the second information to the V2X layer of the second terminal.

For the description of the second information, reference may be made to the foregoing description, which will not be repeated here.

S803. The V2X layer of the second terminal sends the second information to the V2X layer of the first terminal.

S804. The V2X layer of the first terminal sends the second information to the application layer of the first terminal.

S805. The application layer of the first terminal sends fourth information to the V2X layer of the first terminal according to the second information.

S806. The V2X layer of the first terminal instructs the access layer of the first terminal to switch to the first receiving mode according to the fourth information.

As a possible implementation, the V2X layer of the first terminal sends eighth information to the access layer of the first terminal according to the fourth information, where the eighth information is used to instruct the access layer of the first terminal to switch to the first receiving mode . Therefore, the access layer of the first terminal switches to the first receiving mode according to the eighth information.

The solutions provided by the embodiments of the present application have been introduced above mainly from the perspective of methods. It can be understood that, in order to realize the above-mentioned functions, the terminal includes corresponding hardware structures and/or software modules for executing each function. Those skilled in the art should easily realize that the present application can be implemented in hardware or in the form of a combination of hardware and computer software, in conjunction with the algorithm steps of the examples described in the embodiments disclosed herein. Whether a function is performed by hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this application.

In this embodiment of the present application, the terminal may be divided into functional modules according to the foregoing method examples. For example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The above-mentioned integrated modules can be implemented in the form of hardware, and can also be implemented in the form of software function modules. It should be noted that, the division of modules in the embodiments of the present application is schematic, and is only a logical function division, and there may be other division manners in actual implementation. The following is an example of dividing each function module corresponding to each function to illustrate:

As shown in FIG. 14 , a communication apparatus provided by an embodiment of the present application includes: a processing module 201 and a communication module 202 .

In an example, the communication device is the above-mentioned first terminal, or a chip applied in the first terminal. In this case, the processing module 201 is configured to support the first terminal to perform step S101 in FIG. 6 , steps S201-S204 in FIG. 7 , steps S301-S303 in FIG. Step S304, steps S401-S403 in FIG. 9, steps S501-S504 in FIG. 10, step S603 in FIG. 11, step S705 in FIG. 12, steps S804-S806 in FIG. 13. The communication module 202 is configured to support the first terminal to perform step S102 in FIG. 6 , step S602 in FIG. 11 , step S704 in FIG. 12 , and step S803 in FIG. 13 .

In another example, the communication device is the above-mentioned second terminal, or a chip applied in the second terminal. In this case, the processing module 201 is configured to support the second terminal to perform step S104 in FIG. 6 , step S601 in FIG. 11 , steps S701-S703 in FIG. 12 , and steps S801 and S802 in FIG. 13 . The communication module 202 is configured to support the second terminal to perform step S103 in FIG. 6 , step S602 in FIG. 11 , step S704 in FIG. 12 , and step S803 in FIG. 13 .

In a possible embodiment, the communication device further includes a storage module 203 . The storage module is used to store program codes and data that can be used by the communication device.

As an example, in conjunction with the communication apparatus in FIG. 4 , the processing module 201 in FIG. 14 may be implemented by the processor 101 in FIG. 4 , and the communication module 202 in FIG. 14 may be implemented by the communication interface 103 in FIG. 4 . The storage module 203 in FIG. 14 may be implemented by the memory 104 in FIG. 4 .

An embodiment of the present application provides a communication system, where the communication system includes a first terminal and a second terminal. The first terminal is used to execute the methods shown in FIG. 6 to FIG. 13 . The second terminal is used to execute the methods shown in FIG. 6 and FIG. 11 to FIG. 13 .

The embodiments of the present application further provide a computer-readable storage medium, on which instructions are stored, and when the instructions are executed, the methods in the foregoing method embodiments are performed.

The embodiments of the present application further provide a computer program product including an instruction, when the instruction is executed, the method in the foregoing method embodiment is performed.

An embodiment of the present application further provides a chip, where the chip includes a processor for implementing the technical method of the embodiment of the present invention. In a possible design, the chip further includes a memory for storing necessary program instructions and/or data of the communication device according to the embodiment of the present invention. In one possible design, the chip also includes memory for the processor to invoke application code stored in the memory. The chip may be composed of one or more chips, or may include chips and other discrete devices, which are not specifically limited in this embodiment of the present application.

The steps of the methods or algorithms described in conjunction with the disclosure of the present application may be implemented in a hardware manner, or may be implemented in a manner in which a processor executes software instructions. Software instructions can be composed of corresponding software modules, and software modules can be stored in RAM, flash memory, ROM, erasable programmable read-only memory (erasable programmable read-only memory, EPROM), electrically erasable programmable read-only memory (electrically EPROM, EEPROM), registers, hard disk, removable hard disk, compact disk read only (CD-ROM), or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor, such that the processor can read information from, and write information to, the storage medium. Of course, the storage medium can also be an integral part of the processor. The processor and storage medium may reside in an ASIC. Alternatively, the ASIC may be located in the core network interface device. Of course, the processor and the storage medium may also exist in the core network interface device as discrete components. Alternatively, the memory may be coupled to the processor, eg, the memory may exist independently and be connected to the processor through a bus. The memory can also be integrated with the processor. The memory may be used to store application code for executing the technical solutions provided by the embodiments of the present application, and the execution is controlled by the processor. The processor is configured to execute the application program code stored in the memory, thereby implementing the technical solutions provided by the embodiments of the present application.

From the description of the above embodiments, those skilled in the art can clearly understand that for the convenience and brevity of the description, only the division of the above functional modules is used as an example for illustration. In practical applications, the above functions can be allocated as required. It is completed by different functional modules, that is, the internal structure of the device is divided into different functional modules, so as to complete all or part of the functions described above.

In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the device embodiments described above are only illustrative. For example, the division of the modules or units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be Incorporation may either be integrated into another device, or some features may be omitted, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may be one physical unit or multiple physical units, that is, they may be located in one place, or may be distributed to multiple different places . Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units.

If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present application can be embodied in the form of software products in essence, or the parts that contribute to the prior art, or all or part of the technical solutions, which are stored in a storage medium , including several instructions to make a device (may be a single chip microcomputer, a chip, etc.) or a processor (processor) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk and other mediums that can store program codes.

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited to this, and any changes or substitutions within the technical scope disclosed in the present application should be covered within the protection scope of the present application. . Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

A communication method, characterized in that the method comprises:

The first terminal switches from the first receiving mode to the second receiving mode, where the first receiving mode is used for the first terminal to continuously receive data on the PC5 port, and the second receiving mode is used when the first terminal is receiving data. Receive data on the PC5 port within the periodic receive window;

The first terminal broadcasts first information, where the first information is used to indicate that the first terminal is in the second receiving mode.
The method according to claim 1, wherein the first information comprises user information of the first terminal;

The first information also includes one or more of the following parameters: the duration of the receive window, the duration of the receive cycle, the start time of the receive window, the start time of the receive cycle, or receive mode information;

The reception mode information is used to indicate the reception mode in which the first terminal is located.
The method according to claim 1 or 2, wherein the switching of the first terminal from the first receiving mode to the second receiving mode comprises:

The IoV V2X layer of the first terminal receives third information, where the third information is used to switch the first terminal to the second receiving mode;

The V2X layer of the first terminal instructs the access layer of the first terminal to switch to the second reception mode according to the third information.
The method according to claim 3, wherein the third information includes the duration of the reception cycle and the duration of the reception window.
The method according to claim 3 or 4, wherein the method further comprises:

The application layer of the first terminal switches the first terminal from the first reception mode to the second reception mode;

The application layer of the first terminal sends the third information to the V2X layer of the first terminal.
The method according to claim 5, wherein the determination by the application layer of the first terminal to switch the first terminal from the first receiving mode to the second receiving mode comprises:

The application layer of the first terminal determines that the first terminal does not have a security risk.
The method according to claim 6, wherein the application layer of the first terminal determines that the first terminal does not have a security risk, comprising:

The application layer of the first terminal acquires motion information of at least one second terminal;

The application layer of the first terminal acquires the motion information of the first terminal;

The application layer of the first terminal determines that the first terminal does not have a security risk according to the motion information of the first terminal and the motion information of the at least one second terminal.
The method according to claim 7, wherein the application layer of the first terminal determines that the first terminal does not exist according to the motion information of the first terminal and the motion information of the at least one second terminal Security risks, including:

The application layer of the first terminal determines, according to the motion information of the first terminal and the motion information of the at least one second terminal, that any one of the at least one second terminal satisfies the first preset condition .
The method according to claim 8, wherein the first preset condition comprises a combination of one or more of the following:

The relative distance between the second terminal and the first terminal is greater than or equal to a first preset value;

The relative speed between the second terminal and the first terminal is less than or equal to a second preset value;

The confidence of the collision between the second terminal and the first terminal is less than or equal to a third preset value; or,

The predicted motion trajectory of the second terminal and the predicted motion trajectory of the first terminal have no intersection.
The method according to any one of claims 1 to 9, wherein the method further comprises:

The first terminal switches from the second reception mode to the first reception mode.
The method according to claim 10, wherein the switching of the first terminal from the second reception mode to the first reception mode comprises:

The V2X layer of the first terminal receives fourth information, where the fourth information is used to switch the first terminal to the first receiving mode;

The V2X layer of the first terminal instructs the access layer of the first terminal to switch to the first reception mode according to the fourth information.
The method according to claim 11, wherein the method further comprises:

The application layer of the first terminal determines to switch the first terminal from the second reception mode to the first reception mode;

The application layer of the first terminal sends the fourth information to the V2X layer of the first terminal.
The method according to claim 12, wherein the determining by the application layer of the first terminal to switch the first terminal from the second receiving mode to the first receiving mode comprises:

The application layer of the first terminal determines that the first terminal has a security risk.
The method according to claim 10, wherein before the first terminal switches from the second receiving mode to the first receiving mode, the method further comprises:

The first terminal receives second information sent by the second terminal within the receiving window, where the second information is used to trigger the first terminal to switch from the second receiving mode to the first receiving mode .
The method according to claim 14, wherein the switching of the first terminal from the second reception mode to the first reception mode comprises:

The V2X layer of the first terminal instructs the access layer of the first terminal to switch to the first reception mode according to the second information.
A communication method, characterized in that the method comprises:

The second terminal determines to switch the first terminal in the second receiving mode to the first receiving mode, where the second receiving mode is used for the first terminal to receive data on the PC5 port within the receiving window of each receiving period, and the The first receiving mode is used for the first terminal to continuously receive data on the PC5 port;

The second terminal sends second information to the first terminal, where the second information is used to trigger the first terminal to switch from the second receiving mode to the first receiving mode.
The method of claim 16, wherein the method further comprises:

The second terminal receives the first information sent by the first terminal, where the first information is used for the first terminal to be in the second receiving mode.
The method according to claim 17, wherein the first information comprises user information of the first terminal;

The first information further includes one or more of the following parameters: the duration of the reception window of the first terminal, the duration of the reception period of the first terminal, the start of the reception window of the first terminal time, the start time of the reception cycle of the first terminal, or reception mode information;

The reception mode information is used to indicate the reception mode in which the first terminal is located.
The method according to claim 18, wherein when the first information includes the duration of the reception period of the first terminal and the duration of the reception period of the first terminal, the second terminal Sending second information to the first terminal includes:

The second terminal repeatedly sends the fourth information with a first duration as a sending time interval in a first time period, and the duration of the first time period is greater than or equal to the duration of the receiving cycle of the first terminal , the first duration is less than or equal to the duration of the receiving window of the first terminal.
The method according to claim 18, wherein the source layer 2 identifier used by the first information is the layer 2 identifier of the first terminal;

When the first information includes the duration of the reception period of the first terminal and the duration of the reception period of the first terminal, the second terminal sends the second information to the first terminal, including:

The second terminal determines the time domain offset value of the receiving window according to the duration of the receiving period and the layer 2 identifier of the first terminal;

The second terminal determines the start time of the receiving window of the first terminal according to the time domain offset value;

The second terminal sends the second information to the first terminal within the receiving window of the first terminal according to the start time of the receiving window and the duration of the receiving window.
The method according to claim 18, wherein when the first information includes the duration of the reception window of the first terminal and the start time of the reception window of the first terminal, the first information The second terminal sends second information to the first terminal, including:

The second terminal sends the second terminal to the first terminal within the receiving window of the first terminal according to the duration of the receiving window of the first terminal and the start time of the receiving window of the first terminal. information.
The method according to any one of claims 16 to 18, wherein the sending, by the second terminal, the second information to the first terminal comprises:

The second terminal sends the information to the first terminal within the receiving window of the first terminal according to the preconfigured duration of the receiving window of the first terminal and the start time of the receiving window of the first terminal. the second information.
The method according to any one of claims 16 to 22, wherein the second terminal determining to switch the first terminal in the second receiving mode to the first receiving mode comprises:

The second terminal determines that the first terminal has a security risk.
The method according to claim 23, wherein determining, by the second terminal, that the first terminal has a security risk, comprising:

acquiring, by the second terminal, the motion information of the first terminal and the motion information of the second terminal;

The second terminal determines that the second terminal does not meet the first preset condition according to the motion information of the first terminal and the motion information of the second terminal.
The method according to claim 24, wherein the first preset condition comprises a combination of one or more of the following:

The relative distance between the second terminal and the first terminal is greater than or equal to a first preset value;

The relative speed between the second terminal and the first terminal is less than or equal to a second preset value;

The confidence of the collision between the second terminal and the first terminal is less than or equal to a third preset value; or,

The predicted motion trajectory of the second terminal and the predicted motion trajectory of the first terminal have no intersection.
The method according to claim 23, wherein determining, by the second terminal, that the first terminal has a security risk, comprising:

The second terminal determines that the second terminal is in a runaway state.
The method according to any one of claims 16 to 26, wherein the second information includes user information of the first terminal.
A communication device, characterized in that, the communication device includes a unit for executing each step in the method according to any one of claims 1 to 27.
A computer-readable storage medium, characterized in that the computer-readable storage medium stores computer instructions, which, when the computer instructions are executed on a computer, cause the computer to execute the method described in any one of claims 1 to 27. method.
A chip, characterized in that the chip includes a processing unit and a transceiver pin; the processing unit is used to perform the processing operation in the method according to any one of claims 1 to 27, and the transceiver pin is used for in performing the communication operation in the method of any one of claims 1 to 27.