CN112367343A

CN112367343A - Communication method and device

Info

Publication number: CN112367343A
Application number: CN201910667571.3A
Authority: CN
Inventors: 赵灿
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Cloud Computing Technologies Co Ltd
Priority date: 2019-07-23
Filing date: 2019-07-23
Publication date: 2021-02-12
Anticipated expiration: 2039-07-23
Also published as: WO2021013203A1; CN112367343B

Abstract

The application provides a communication method and device. According to the method, a server can determine a first forwarding rule of the early warning information, wherein the first forwarding rule is used for instructing a terminal device receiving the early warning information to send the early warning information according to the first forwarding rule. The server may also send the first forwarding rule to a first road side unit. The first road side unit is located in the upstream direction of a target area, the upstream direction is the opposite direction of the traffic lane allowing passing direction, the traffic lane is the traffic lane included in the road where the target area is located, and the target area is an area which cannot be warned through a road side unit. According to the method, the terminal device forwards the early warning information according to the first forwarding rule, so that the reliability of the early warning information forwarding process is improved.

Description

Communication method and device

Technical Field

The application relates to the technical field of vehicle networking, in particular to a communication method and device.

Background

In the current vehicle networking (V2X), when a V2X message needs to be sent to a vehicle-mounted terminal device, a vehicle networking server (V2X server) can send the V2X message to be sent to a Road Side Unit (RSU), and the road side unit broadcasts the V2X message to the vehicle-mounted terminal device in a road side unit coverage area in a short-distance communication manner.

However, when a certain V2X message needs to be broadcast in a certain area but no rsu is covered in the area, or the rsu covering the area cannot forward the V2X message in time due to load or network reasons, the vehicle-mounted terminal equipment in the area may not receive the V2X message, so that the reliability of V2X message transmission at present needs to be improved.

Disclosure of Invention

The application provides a communication method and a communication device, which are used for improving the reliability of V2X message transmission.

In a first aspect, the present application provides a communication method, which may be performed by a server (or referred to as a car networking server, a car networking platform, or the like). According to the method, a server can determine a first forwarding rule of the early warning information, wherein the first forwarding rule is used for instructing a terminal device receiving the early warning information to send the early warning information according to the first forwarding rule. The server may also send the first forwarding rule to a first road side unit. The first road side unit is located in an upstream direction of the target area, or is located upstream of the target area. The upstream direction is the opposite direction of the traffic lane allowed passing direction, and the traffic lane is the traffic lane included in the road where the target area is located. The target area is an area which cannot be pre-warned by the road side unit.

By adopting the method, the terminal device can receive the first forwarding rule from the first road side unit at the upstream of the target area and forward the early warning information according to the first forwarding rule, so that the vehicle networking terminal in the target area can receive the early warning information forwarded by the terminal device, and therefore, the vehicle networking terminal can not only pass through the road side unit covering the target area when forwarding the V2X message to the target area, and the reliability of the early warning information forwarding process can be improved.

In one possible design, when the road on which the target area is located includes a first lane and a second lane, and the direction of permitted passage of the first lane is different from the direction of permitted passage of the second lane, the upstream direction may include a direction opposite to the direction of permitted passage of the first lane, and/or the upstream direction includes a direction opposite to the direction of permitted passage of the second lane.

In another possible design, when the road on which the target area is located includes a third lane and the road does not include a lane different from a direction of permitted passage of the third lane, the upstream direction may include a direction opposite to the direction of permitted passage of the third lane.

The above first forwarding rule may include a first identifier, where the first identifier is used to instruct a terminal device that receives the warning information to forward the warning information. By adopting the design, the terminal device can determine that the early warning information needs to be forwarded, so that the reliability of forwarding the early warning information is further improved.

The above first forwarding rule may comprise first time information and/or location information. The first time information is used for indicating the starting time and/or the ending time of the terminal device for forwarding the early warning information. The position information is used for indicating the starting position and/or the ending position of the terminal device for forwarding the early warning information.

When the first forwarding rule includes the first time information, the server may determine the first time information according to a coverage area of the first road side unit, a range of the target area, and vehicle speed information, where the vehicle speed information is used to indicate a vehicle speed of a vehicle to which the terminal device belongs. For example, the vehicle speed information may be used to indicate an average vehicle speed for the current road segment. Alternatively, the vehicle speed information may be used to indicate the highest speed limit and/or the lowest speed limit of the current road segment, and so on. By adopting the design, the server can determine the starting time and/or the ending time of the terminal device for forwarding the early warning information, so that the terminal device is ensured to forward the early warning information in the target area, and the reliability of forwarding the early warning information in the target area is further improved.

When the first forwarding rule includes the location information, the server may determine the location information according to a coverage area of the first roadside unit and a range of the target area. By adopting the design, the server can determine the starting position and/or the ending position of the terminal device for forwarding the early warning information, so that the terminal device is ensured to forward the early warning information in the target area, and the reliability of forwarding the early warning information in the target area is further improved.

The target area can be located in the influence range of the early warning event corresponding to the early warning information, and the target area is not covered by the road side unit. Or, the target area may be located within an influence range of an early warning event corresponding to the early warning information, and the second road side unit covering the target area does not satisfy a specific condition. By adopting the design, the reliability of forwarding the early warning information in the coverage area without the road side unit or the coverage area without the road side unit meeting specific conditions within the influence range of the early warning event can be improved.

In a possible example, if the target area is located within an influence range of an early warning event corresponding to the early warning information, and a second roadside unit covering the target area does not satisfy a specific condition, where the specific condition includes an operating state condition, the server may determine, according to the operating state information of the second roadside unit, that the second roadside unit does not satisfy the operating state condition; the operation state information of the second road side unit comprises part or all of the following information: the second road side unit supports the information of the forwarded message type; or, the number of concurrent messages supported by the second roadside unit; or, the current number of concurrent messages of the second road side unit; or, the caching capacity information of the second road side unit; or the current cache message number of the second route side unit.

In another possible example, if the target area is located within an influence range of an early warning event corresponding to the early warning information, and a second roadside unit covering the target area does not satisfy a specific condition, where the specific condition includes a network state condition, the server may determine, according to the network state information of the second roadside unit, that the second roadside unit does not satisfy the network state condition; the network state information of the second roadside unit comprises part or all of the following information: information indicating a load status of the short-range communication network of the second roadside unit; or, information indicating the quality of the near field communication network of the second roadside unit.

The above first forwarding rule may comprise a forwarding frequency and/or a forwarding priority.

The server may further send second time information to the first road side unit, where the second time information is used to indicate a start time and/or an end time when the first road side unit sends the first forwarding rule. By adopting the design, the first route side unit can forward the first forwarding rule at the appointed time so as to save signaling overhead.

The server may further send a second identifier to the first road side unit, where the second identifier is used to instruct the first road side unit to start forwarding the first forwarding rule since the first road side unit receives the first forwarding rule. By adopting the design, the first road side unit can be enabled to forward the first forwarding rule in a timing mode, and the reliability of forwarding the early warning information is improved.

The above first roadside unit may be a first roadside unit in an upstream direction of the target region. In other words, the first roadside unit is the one closest to the target region in the upstream direction of the target region.

The server can also send a second forwarding rule of the early warning information to a third route side unit, wherein the second forwarding rule comprises a third identifier, and the third identifier is used for indicating a terminal device receiving the early warning information not to forward the early warning information. By adopting the design, the terminal device can not forward the early warning information so as to save signaling overhead.

The server may further send third time information to the third route side unit, where the third time information is used to indicate a start time and/or an end time when the third route side unit sends the second forwarding rule. By adopting the design, the first route side unit can forward the second forwarding rule at the appointed time so as to save signaling overhead.

The server may further send a fourth identifier to the third route side unit, where the fourth identifier is used to instruct the third route side unit to start sending the second forwarding rule since the third route side unit receives the second forwarding rule. By adopting the design, the first road side unit can be enabled to forward the second forwarding rule in a timing mode, so that the terminal device is indicated in time not to forward the early warning information, and signaling overhead is saved.

For example, the third route-side unit may be located in a downstream direction of the target area, where the downstream direction is the road passing-allowing direction. In other words, the downstream direction is opposite the upstream direction.

The server may also subscribe to one or more of the rsus (including but not limited to the first rsu, the second rsu, and the third rsu) for one or more of the rsu's operating status information, network status information, or indication information, e.g., the server sends a subscription request to the one or more rsus, respectively. The server may also receive one or more of operating status information, network status information, or indication information sent by any one or more of the one or more rsus. The operation state information can be used for the server to judge whether the road side unit meets the operation state condition. The network state information may be used by the server to determine whether the road side unit satisfies the network state condition. The indication information may be used to indicate whether the rsu meets an operational status condition and/or to indicate whether the rsu meets a network status condition. By adopting the design, the server can know which road side units can not forward the early warning information, so that the early warning information can be forwarded in the coverage area of the road side units through the terminal device, and the forwarding reliability of the early warning information can be improved.

In a second aspect, the present application provides a method of communication that is implementable by a first router unit. According to the method, a first road side unit receives a first forwarding rule of early warning information from a server, wherein the first forwarding rule is used for indicating a terminal device receiving the early warning information to send the early warning information according to the first forwarding rule. The first roadside unit may also send the first forwarding rule. The first road side unit can be located in the upstream direction of a target area, the upstream direction is the opposite direction of the traffic lane allowing passing direction, the traffic lane is the traffic lane included in the road where the target area is located, and the target area is an area which cannot be warned by the road side unit.

The first road side unit may further receive second time information from the server, where the second time information is used to indicate a start time and/or an end time when the first road side unit sends the first forwarding rule. The first road side unit can also send the first forwarding rule according to the second time information.

The first road side unit may further receive a third identifier from the server, and start forwarding the first forwarding rule after receiving the first forwarding rule according to the third identifier.

The first roadside unit may broadcast the first forwarding rule and/or send the first forwarding rule to terminal devices within a coverage area of the first roadside unit.

The first roadside unit may be a first roadside unit located in an upstream direction of the target region.

The first road side unit may further receive a subscription request from the server, where the subscription request may be used to request the first road side unit to send one or more of operation state information, network state information, or indication information. The subscription request may be used to request the first road-side unit to report the operation state information and/or the network state information periodically, or the subscription request may be used to request the first road-side unit to report the operation state information and/or the network state information after the first road-side unit meets the operation state threshold, or the subscription request may be used to request the first road-side unit to report the indication information after the first road-side unit determines that the first road-side unit does not meet the specific condition. By adopting the design, the server can know whether the first road side unit can not forward the early warning information or not, so that the early warning information can be forwarded in the coverage area of the first road side unit through the terminal device when the first road side unit can not forward the early warning information, and the forwarding reliability of the early warning information is improved.

In a third aspect, the present application provides a communication method that may be implemented by a second roadside unit. According to the method, the second roadside unit may receive a subscription request from the server, the subscription request operable to request the second roadside unit to transmit one or more of operational state information, network state information, or indication information. The subscription request may be used to request the second-way unit to report the operation state information and/or the network state information periodically, or the subscription request may be used to request the second-way unit to report the indication information after determining that the second-way unit does not satisfy the specific condition. By adopting the design, the server can know whether the second roadside unit can not forward the early warning information or not, so that the early warning information can be forwarded in the coverage area of the second roadside unit through the terminal device when the second roadside unit can not forward the early warning information, and the forwarding reliability of the early warning information is improved. The second roadside unit may send one or more of operation state information, network state information, or indication information according to the subscription request.

In a fourth aspect, the present application provides a communication method that may be implemented by a third routing-side unit. According to the method, a third route side unit can receive a second forwarding rule of the early warning information from the server, wherein the second forwarding rule comprises a third identifier, and the third identifier is used for indicating a terminal device receiving the early warning information not to forward the early warning information. The third routing-side unit may send the second forwarding rule. The third road side unit can be located in a downstream direction of a target area, the downstream direction is a traffic allowing direction of the lane, the lane is a lane included in a road where the target area is located, and the target area is an area which cannot be warned through a road side unit. By adopting the method, the third path side unit can forward the second forwarding rule of the early warning information to the terminal devices to indicate the terminal devices not to forward the early warning information, thereby saving signaling overhead.

The third road side unit may further receive third time information from the server, and send the second forwarding rule according to the third time information, where the third time information is used to indicate a start time and/or an end time of sending the second forwarding rule by the second road side unit. By adopting the design, the third path side unit can forward the second forwarding rule at the appointed time so as to save the signaling overhead.

The third route side unit may further receive a fourth identifier from the server, and start forwarding the second forwarding rule after receiving the second forwarding rule according to the fourth identifier. By adopting the design, the third path side unit can immediately forward the second forwarding rule, so that the terminal device is indicated in time not to forward the early warning information to save signaling overhead.

The third routing-side unit may broadcast the second forwarding rule and/or send the second forwarding rule to terminal devices within a coverage area of the third routing-side unit.

In a fifth aspect, the present application provides a communication method, which may be implemented by a terminal device. According to the method, the terminal device can receive a first forwarding rule of the early warning information from a first road side unit, and after receiving the early warning information, the terminal device sends the early warning information according to the first forwarding rule. The first road side unit can be located in the upstream direction of a target area, the upstream direction is the opposite direction of the traffic lane allowing passing direction, the traffic lane is the traffic lane included in the road where the target area is located, and the target area is an area which cannot be warned by the road side unit. By adopting the design, the terminal device can receive the first forwarding rule from the first road side unit at the upstream of the target area and forward the early warning information according to the first forwarding rule, so that the reliability in forwarding the early warning information is improved.

The above first forwarding rule may include a first identifier, where the first identifier is used to instruct a terminal device that receives the warning information to forward the warning information.

The above-mentioned first forwarding rule may comprise first time information and/or location information. The first time information is used for indicating the starting time and/or the ending time of the terminal device for forwarding the early warning information; the position information is used for indicating the starting position and/or the ending position of the terminal device for forwarding the early warning information.

The first forwarding rule mentioned above includes a forwarding frequency and/or a forwarding priority.

The terminal device may also receive the warning information from the first roadside unit.

The terminal device may further receive a second forwarding rule of the warning information from a third route side unit, where the second forwarding rule includes a third identifier, and the third identifier is used to indicate that the terminal device receiving the warning information does not forward the warning information. The third route-side unit may be located in a downstream direction of the target area, the downstream direction being a direction in which the lane is allowed to pass. By adopting the method, when the terminal device moves to the downstream of the target area, the third road side unit can indicate that the terminal device does not forward the early warning information any more, so that the signaling overhead is saved.

In a sixth aspect, the present application provides a communications device operable to perform the method provided in the first aspect above or any one of the possible designs of the first aspect. The communication device may include the above server. The communication apparatus may implement the functions of the above methods in the form of a hardware structure, a software module, or a hardware structure plus a software module.

When formed by software modules, the communication device may include a communication module and a processing module coupled to each other, wherein the communication module may be used to support the communication device for communication, and the processing module may be used to perform processing operations on the communication device, such as generating information/messages to be transmitted or processing received signals to obtain information/messages.

In carrying out the method provided in the above first aspect, the processing module may be configured to determine a first forwarding rule of the warning information, where the first forwarding rule is used to instruct a terminal device receiving the warning information to send the warning information according to the first forwarding rule. The communication module may be configured to send the first forwarding rule to a first roadside unit. The first road side unit can be located in the upstream direction of a target area, the upstream direction is the opposite direction of the traffic lane allowing passing direction, the traffic lane is the traffic lane included in the road where the target area is located, and the target area is an area which cannot be warned by the road side unit.

The first forwarding rule comprises a first identifier, and the first identifier is used for indicating a terminal device receiving the early warning information to forward the early warning information.

The above first forwarding rule comprises first time information and/or location information. The first time information is used for indicating the starting time and/or the ending time of the terminal device for forwarding the early warning information. The position information is used for indicating the starting position and/or the ending position of the terminal device for forwarding the early warning information.

When the first forwarding rule includes the first time information, the processing module may be further configured to determine the first time information according to a coverage area of the first road side unit, a range of the target area, and vehicle speed information, where the vehicle speed information is used to indicate a vehicle speed of a vehicle to which the terminal device belongs.

When the first forwarding rule includes the location information, the processing module may be further configured to determine the location information according to a coverage area of the first roadside unit and a range of the target area.

The target area is located in the influence range of the early warning event corresponding to the early warning information, and no road side unit is covered in the target area, and/or the target area is located in the influence range of the early warning event corresponding to the early warning information, and a second road side unit covering the target area does not meet a specific condition.

In a possible example, if the target area is located within an influence range of an early warning event corresponding to the early warning information, and a second roadside unit covering the target area does not satisfy a specific condition, where the specific condition includes an operating state condition, the processing module may be further configured to determine that the second roadside unit does not satisfy the operating state condition according to the operating state information of the second roadside unit. The operation state information of the second road side unit comprises part or all of the following information: the second road side unit supports the information of the forwarded message type; or, the number of concurrent messages supported by the second roadside unit; or, the current number of concurrent messages of the second road side unit; or, the caching capacity information of the second road side unit; or the current cache message number of the second route side unit.

In another possible example, if the target area is located within an influence range of an early warning event corresponding to the early warning information, and the second roadside unit covering the target area does not satisfy a specific condition, where the specific condition includes a network state condition, the processing module may be further configured to determine, according to the network state information of the second roadside unit, that the second roadside unit does not satisfy the network state condition. Wherein the network state information of the second roadside unit includes part or all of the following information: information indicating a load status of the short-range communication network of the second roadside unit; or, information indicating the quality of the near field communication network of the second roadside unit.

The above first forwarding rule may further comprise a forwarding frequency and/or a forwarding priority.

Optionally, the communication module may be further configured to: sending second time information to the first road side unit, wherein the second time information is used for indicating the starting time and/or the ending time of the first road side unit for sending the first forwarding rule; or sending a second identifier to the first road side unit, where the second identifier is used to indicate that the first road side unit starts to forward the first forwarding rule since the first road side unit receives the first forwarding rule.

The above first roadside unit may be a first roadside unit in an upstream direction of the target region.

The communication module may be further configured to send a second forwarding rule of the warning information to a third side unit, where the second forwarding rule includes a third identifier, and the third identifier is used to indicate a terminal device that receives the warning information not to forward the warning information.

The communication module may be further operable to: sending third time information to the third route side unit, where the third time information is used to indicate a start time and/or an end time of sending the second forwarding rule by the third route side unit; or, sending a fourth identifier to the third route side unit, where the fourth identifier is used to instruct the third route side unit to start sending the second forwarding rule since the third route side unit receives the second forwarding rule.

The above third route-side unit may be located in a downstream direction of the target area, the downstream direction being a direction in which the lane is allowed to pass.

The communication module may be further configured to send the subscription request to the rsu, and receive one or more of operation status information, network status information, or indication information from the rsu. The processing module may further determine whether the rsu does not satisfy the specific condition according to one or more of the operation status information, the network status information, or the indication information of the rsu.

When the communication device according to the sixth aspect or any of the possible designs of the sixth aspect is implemented by hardware components, the communication device may comprise a communication interface and a processor. Wherein the communication interface is used for the communication device to communicate. The processor may be adapted to read and invoke a program stored in the memory to perform the method provided in the first aspect above or any one of the possible designs of the first aspect. Additionally, the communication device may further include a memory coupled to the processor for storing the program described above. Illustratively, the processor may be configured to read and call a program stored in the memory to perform the method performed by the processing module above. The communication interface may be used to perform the methods performed by the above communication module.

In a seventh aspect, the present application provides a communications device operable to perform the method provided in the second aspect or any of the possible designs of the second aspect above. The communication device may comprise the above first roadside unit. The communication apparatus may implement the functions of the above methods in the form of a hardware structure, a software module, or a hardware structure plus a software module.

When formed by software modules, the communication device may include a communication module and a processing module coupled to each other, where the communication module may be used to support the communication device for communication, such as by wired and/or wireless means. The processing module may be used for the communication device to perform processing operations, such as generating information/messages that need to be transmitted or processing received signals to obtain information/messages.

In carrying out the method provided in the above first aspect, the communication module may be configured to receive, from a server, a first forwarding rule of warning information, the first forwarding rule being used to instruct a terminal device receiving the warning information to transmit the warning information according to the first forwarding rule. The communication module may also be to send the first forwarding rule. The communication device can be located in the upstream direction of a target area, the upstream direction is the opposite direction of the traffic lane passing permission direction, the traffic lane is the traffic lane included in the road where the target area is located, and the target area is an area which cannot be warned by a road side unit.

The communication module may be further configured to receive second time information from the server, and send the first forwarding rule according to the second time information, where the second time information is used to indicate a start time and/or an end time of sending the first forwarding rule by the communication device.

The communication module may be further configured to receive a third identifier from the server, and start forwarding the first forwarding rule after receiving the first forwarding rule according to the third identifier.

The communication module may be specifically configured to broadcast the first forwarding rule and/or to transmit the first forwarding rule to terminal devices within a coverage area of the communication device.

The communication device may be a first rsu in an upstream direction of the target area.

The communication module may be further configured to receive a subscription request from the server, and send one or more of operation status information, network status information, or indication information to the server according to the subscription request. The processing module can be used for judging whether the communication device meets specific conditions, and if not, the communication module can also be used for sending indication information to the server.

When the communication device according to the seventh aspect or any possible design of the seventh aspect is implemented by hardware components, the communication device may include a communication interface, a transceiver, and a processor. The communication interface may be used for the communication device to perform wired communication, for example, the communication device may be used for communication with the server described in the present application. The transceiver may be used for wireless communication of the communication device via a wireless air interface (e.g., via PCF5 or DSRC), for example, may be used for communication of a terminal device with the terminal device described herein. The processor may be adapted to read and invoke a program stored in the memory to perform a method provided in the second aspect above or any of the possible designs of the second aspect. Additionally, the communication device may further include a memory coupled to the processor for storing the program described above. Illustratively, the processor may be configured to read and call a program stored in the memory to perform the method performed by the processing module above. The communication interface may be configured to perform a step of receiving part or all of the first forwarding rule, the second time information, or the third identifier of the warning information performed by the communication module, or perform other communication steps with the server as described in this application. The transceiver may be configured to perform the step of transmitting the first forwarding rule of the warning information performed by the communication module.

In an eighth aspect, the present application provides a communications device operable to perform the method provided in any one of the possible designs of the third aspect or the third aspect above. The communication device may comprise the above second roadside unit. The communication apparatus may implement the functions of the above methods in the form of a hardware structure, a software module, or a hardware structure plus a software module.

The communication module may be operable to receive a subscription request from a server. The communication module may be further configured to send one or more of operation status information, network status information, or indication information to the server according to the subscription request. The subscription request may be used to request the second-way unit to report the operation state information and/or the network state information periodically, or the subscription request may be used to request the second-way unit to report the indication information after determining that the second-way unit does not satisfy the specific condition. The processing module can be used for judging whether the communication device meets specific conditions, and if not, the communication module can also be used for sending indication information to the server.

When the communication device according to the eighth aspect or any one of the possible designs of the eighth aspect is implemented by hardware components, the communication device may include a communication interface and a processor. The communication interface may be used for the communication device to perform wired communication, for example, the communication device may be used for communication with the server described in the present application. The processor may be adapted to read and call a program stored in the memory to perform the method provided in the third aspect or any of the possible designs of the third aspect above. Illustratively, the processor may be configured to read and call a program stored in the memory to perform the method performed by the processing module above. The communication interface may be used to perform the methods performed by the above communication module.

In a ninth aspect, the present application provides a communications device operable to perform the method provided in any one of the above possible designs of the fourth aspect or the fourth aspect. The communication device may comprise the above third route side unit. The communication apparatus may implement the functions of the above methods in the form of a hardware structure, a software module, or a hardware structure plus a software module.

The communication module may be configured to receive a second forwarding rule of the warning information from the server, where the second forwarding rule includes a third identifier, and the third identifier is used to instruct a terminal device that receives the warning information not to forward the warning information. The communication module may also send the second forwarding rule. The third road side unit can be located in a downstream direction of a target area, the downstream direction is a traffic allowing direction of a lane, the lane is a lane included in a road where the target area is located, and the target area is an area which cannot be warned through a road side unit.

For example, when the road on which the target area is located includes a first lane and a second lane, and the direction of permitted passage of the first lane is different from the direction of permitted passage of the second lane, the downstream direction includes the direction of permitted passage of the first lane, and/or the upstream direction includes the direction of permitted passage of the second lane.

In addition, when the road on which the target area is located includes a third lane and the road does not include a lane different from a direction of permitted passage of the third lane, the upstream direction includes the direction of permitted passage of the third lane.

The communication module may further receive third time information from the server, and send the second forwarding rule according to the third time information, where the third time information is used to indicate a start time and/or an end time of sending the second forwarding rule by the second roadside unit.

The communication module may also receive a fourth identifier from the server and begin forwarding the second forwarding rule upon receiving the second forwarding rule based on the fourth identifier.

The communication module may also broadcast the second forwarding rule and/or transmit the second forwarding rule to terminal devices within a coverage area of the third routing-side unit.

When the communication device according to any one of the possible designs of the ninth aspect or the ninth aspect is implemented by hardware components, the communication device may include a communication interface, a transceiver, and a processor. The communication interface may be used for the communication device to perform wired communication, for example, the communication device may be used for communication with the server described in the present application. The transceiver may be used for the communication device to perform wireless communication over a wireless air interface, for example, may be used for a terminal device to communicate with the terminal device described in this application. The processor may be adapted to read and call a program stored in the memory to perform the method provided in the third aspect or any of the possible designs of the third aspect above. Illustratively, the processor may be configured to read and call a program stored in the memory to perform the method performed by the processing module above. The communication interface may be used to perform the methods performed by the above communication module. The transceiver may be configured to perform the step of sending the second forwarding rule of the warning information performed by the communication module.

In a tenth aspect, the present application provides a communications device operable to perform the method provided in the fifth aspect or any of the possible designs of the fifth aspect above. The communication device may include the above terminal device. The communication apparatus may implement the functions of the above methods in the form of a hardware structure, a software module, or a hardware structure plus a software module.

The communication module may be configured to receive a first forwarding rule of the warning information from a first road side unit, and after receiving the warning information, the communication module may be further configured to send the warning information according to the first forwarding rule. The first road side unit can be located in the upstream direction of a target area, the upstream direction is the opposite direction of the traffic lane allowing passing direction, the traffic lane is the traffic lane included in the road where the target area is located, and the target area is an area which cannot be warned by the road side unit.

The above first forwarding rule may comprise first time information and/or location information. The first time information is used for indicating the starting time and/or the ending time of the communication device for forwarding the early warning information. The position information is used for indicating the starting position and/or the ending position of the communication device for forwarding the early warning information.

The communication module may also be configured to receive the warning information from the first roadside unit.

The communication module may further be configured to receive a second forwarding rule of the warning information from a third route side unit, where the second forwarding rule includes a third identifier, and the third identifier is used to indicate that a terminal device receiving the warning information does not forward the warning information. The third route side unit is located in the downstream direction of the target area, and the downstream direction is a lane passing-allowing direction.

In an eleventh aspect, the present application provides a communication system comprising the communication apparatus of any one of the above sixth aspect or sixth aspect, the communication apparatus of any one of the seventh aspect or seventh aspect, and the communication apparatus of any one of the above tenth aspect or tenth aspect. The communication system may further comprise a communication device according to any of the above-mentioned eighth aspect or eighth aspect and/or a communication device according to any of the above-mentioned ninth aspect or ninth aspect.

In a twelfth aspect, the present application provides a computer storage medium having instructions (or programs) stored therein, which when invoked for execution on a computer, cause the computer to perform the method described in the first aspect or any one of the possible designs of the first aspect, any one of the possible designs of the second aspect or the second aspect, any one of the possible designs of the third aspect or the third aspect, any one of the possible designs of the fourth aspect or the fourth aspect, or any one of the possible designs of the fifth aspect or the fifth aspect.

In a thirteenth aspect, the present application provides a computer program product, which may contain instructions, which, when run on a computer, cause the computer to perform the method as described in the first aspect or any one of the possible designs of the first aspect, any one of the possible designs of the second aspect or the second aspect, any one of the possible designs of the third aspect or the third aspect, any one of the possible designs of the fourth aspect or the fourth aspect, or any one of the possible designs of the fifth aspect or the fifth aspect.

In a fourteenth aspect, the present application provides a chip or chip system comprising a chip, which chip may comprise a processor. The chip may also include a memory (or storage module) and/or a transceiver (or communication module). The chip may be configured to call and execute a program stored in a memory (or a storage module), and execute the method described in the first aspect or any one of the possible designs of the first aspect, the second aspect or any one of the possible designs of the second aspect, the third aspect or any one of the possible designs of the third aspect, the fourth aspect or any one of the possible designs of the fourth aspect, or any one of the possible designs of the fifth aspect or the fifth aspect. The chip system may be formed by the above chip, and may also include the above chip and other discrete devices, such as a memory (or a storage module) and/or a transceiver (or a communication module).

Advantageous effects in the second to fourteenth aspects and possible designs thereof described above reference may be made to the description of advantageous effects of the method described in the first aspect and possible designs thereof.

Drawings

Fig. 1 is a schematic architecture diagram of a communication system according to an embodiment of the present application;

fig. 2 is a flowchart illustrating a communication method according to an embodiment of the present application;

fig. 3 is a schematic flowchart of another communication method 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;

fig. 5 is a schematic structural diagram of another communication device according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of another communication device according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of another communication device according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of another communication device according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of another communication device according to an embodiment of the present application.

Detailed Description

The communication system provided by the embodiment of the application can comprise a vehicle networking terminal, a road side unit and a vehicle networking server.

Herein, the car networking terminal may also be referred to as a car networking communication device or a car terminal device in the present application, and may be referred to as a terminal or a terminal device for short hereinafter. The car networking terminal may be a car networking terminal of a vehicle or a non-motor vehicle with communication function, a portable device, a wearable device, a mobile phone (or referred to as a "cellular" phone), a portable, pocket, hand-held terminal, or a chip in these devices, etc. The vehicle is a typical vehicle networking terminal, and in the following embodiments, the vehicle is taken as an example for description, and the embodiments taking the vehicle as an example in the present application can also be applied to other types of terminals. It should be understood by those skilled in the art that the car networking terminal may specifically execute the car networking related business process through its internal functional units or devices. For example, when the car networking terminal is a vehicle, one or more devices in the vehicle, such as a vehicle mounted Box (T-Box), a Domain Controller (DC), a multi-domain controller (MDC), an On Board Unit (OBU), or a car networking chip, may be used to execute the method flow related to the car networking terminal in the embodiment of the present application.

And the road side unit can be used for sending the V2X message to the vehicle networking terminal in a communication mode of direct communication (PC5) or Dedicated Short Range Communications (DSRC). For example, the V2X message may carry early warning information or other information that needs to be notified to the Internet of vehicles terminal. The communication method between the road side unit and the terminal may be referred to as vehicle to infrastructure (V2I) communication. The specific deployment form of the road side unit is not particularly limited in the present application, and may be a car networking terminal, a mobile or non-mobile terminal device, a server or a chip, and the like. The roadside unit may also be configured to report early warning information of an early warning event occurring within the jurisdiction range to the vehicle networking server, for example, report the early warning information through a roadside information (RSI) message, or report a notification for indicating the early warning event through an RSI message.

The vehicle networking server can be a vehicle networking platform or server for managing the vehicle networking terminal and/or the road side unit, and the vehicle networking server can be referred to as the server for short subsequently. The specific deployment form of the internet of vehicles server is not limited in the application, and specifically can be cloud deployment, and can also be independent computer equipment or chips and the like. When the V2X message needs to be sent to the Internet of vehicles terminal, the V2X message can be sent to the road side unit by the Internet of vehicles server, and the road side unit broadcasts to the Internet of vehicles terminal in the coverage area.

Based on the above communication system, the internet of vehicles server may communicate with a plurality of roadside units deployed at the roadside of a road (which may include one or more lanes). Each rsu may send a V2X message to the internet of vehicles terminal within its respective coverage area. There may be coincidence between the coverage areas of the above multiple RSUs.

In fig. 1, fig. 1(a), fig. 1(b) and fig. 1(c) respectively show different deployment manners of a plurality of road side units RSU1, RSU2, RSU3, RSU4 and RSU5 within the same road range. The car networking terminal may comprise a first car networking terminal or a second car networking terminal as described in fig. 1(a), or comprise other car networking terminals not shown in the figures. It should be understood that fig. 1 only shows that the road includes the illustrated lane 1 and lane 2, and the present application does not limit the road to include other lanes.

Taking the RSU deployment pattern shown in fig. 1(a) as an example, the coverage area of RSU1 may be represented by area GH (i.e., the area between the position shown by dashed line G and the position shown by dashed line H), the coverage area of RSU2 may be represented by area EF (i.e., the area between the position shown by dashed line E and the position shown by dashed line F), and the coverage area of RSU3 may be represented by area CD (i.e., the area between the position shown by dashed line C and the position shown by dashed line D). The coverage area of the RSU4 as shown in fig. 1(b) may be represented by the area GH. The coverage area of the RSU5 as shown in fig. 1(c) may be represented by the area CD.

The coverage area of each RSU above may include lane 1 and/or lane 2 of the road, in other words, the road in which the coverage area of each RSU is located includes lane 1 and/or lane 2. Taking RSU2 as an example, the coverage area of RSU2 includes an area where area EF coincides with lane 1, and/or includes an area where area EF of RSU2 coincides with lane 2.

According to the RSU deployment shown in fig. 1(a), the RSU1 and RSU2 are both located in lane 1 (or RSU1 and RSU2 are both located on the roadside of lane 1), and the allowed passing directions of lane 1 and lane 2 are the same. In this example, the RSU1 may be said to be located upstream of the coverage area of RSU2, which is opposite to the direction of permitted traffic for lane 1 and/or lane 2. The lanes refer to routes on roads for vehicles to travel, each road may include one or more lanes, and the allowed traffic direction of each lane may be the same or different. The direction of the lane, i.e., the direction in the lane in which the vehicle is allowed to travel. In addition, in this example, the RSU2 may be referred to as being located in a downstream direction (or downstream direction) of the coverage area of the RSU1, i.e., the direction of traffic permitted in lane 1 and lane 2.

According to the RSU deployment shown in fig. 1(b), the RSU2 is located in lane 1 and the RSU4 is located in lane 2, and the direction of permitted traffic in lane 1 is the same as the direction of permitted traffic in lane 2. For example, it may be said that RSU4 is located in an upstream direction of the coverage area of RSU2, which is opposite to the direction of permitted traffic for lane 1 and/or lane 2. In addition, in this example, the RSU2 may be referred to as being located in a downstream direction (or downstream direction) of the coverage area of the RSU4, i.e., the direction of traffic permitted in lane 1 and lane 2.

According to the RSU deployment shown in fig. 1(c), RSU2 is located in lane 1 and RSU5 is located in lane 2, and the direction of permitted traffic in lane 1 is opposite to the direction of permitted traffic in lane 2. Illustratively, it may be said that RSU5 is located in an upstream direction of the coverage area of RSU2, which is opposite to the direction of allowable traffic of lane 2. In this example, RSU2 may be said to be located in a downstream direction (or downstream) of the coverage area of RSU5, i.e., the direction of allowed traffic for lane 2. Additionally, according to the RSU deployment illustrated in fig. 1(c), the RSU1 may be referred to as being located in an upstream direction of the coverage area of the RSU2, and/or the RSU2 may be referred to as being located in a downstream direction of the coverage area of the RSU 1.

It should be understood that the car networking server may obtain the coverage area information of each RSU from each RSU through the communication links between multiple RSUs, for example, according to the RSU deployment manner shown in fig. 1(a), the car networking server may communicate with RSU1, RSU2, and RSU3, respectively. The coverage area information may include information of the boundary of the RSU coverage area, and the car networking server may obtain information of the position G and the position H from the RSU1, for example, according to the RSU deployment manner shown in fig. 1 (a). Alternatively, the coverage area information may include coordinate information (e.g., longitude and latitude information) of the coverage area of the roadside unit, or information such as an identifier, a number, or an index corresponding to the coordinate information.

It should also be understood that the coverage area of the rsu is illustrated as rectangular for ease of understanding, but the present application does not preclude that the coverage area of the rsu may include other regular or irregular shapes other than rectangular.

In the embodiment of the application, the vehicle networking server can send the V2X message to the vehicle networking terminal through the road side unit. For example, the V2X message may be warning information. Wherein the early warning information corresponds to the early warning event. The early warning event refers to an event needing to be broadcast to the internet of vehicles terminal through the V2X message, for example, a construction event existing in a lane, a road or an airline, a traffic control event, a traffic accident event, a severe weather or natural disaster, and the like. The early warning information may include one or more of an identification of the early warning event (e.g., a number, an index, or a name used to indicate a construction event), priority information of the early warning event, start and/or end time of the early warning event, an occurrence location of the early warning event (e.g., a location of the construction event or a traffic accident), influence range information of the early warning event, or lane information occupied by the early warning event.

Specifically, the priority information of the pre-warning event can be used to indicate whether the pre-warning event is an emergency event (or called dynamic event) or a non-emergency event (or called static event). For example, an early warning event with a priority level that meets (or exceeds) a certain threshold is an emergency event, whereas an early warning event with a priority level that is lower (or not lower) than the threshold is a non-emergency event. The emergency event can include a traffic accident, severe weather or natural disaster and other emergencies; non-emergency events may include construction events, traffic control events, and other less sudden events that are often predictable in advance.

The impact range information of the early warning event may be used to indicate the impact range of the early warning time. Taking fig. 1(a) as an example, if the influence range of the warning event includes an area AB (i.e., an area between the position indicated by the dashed line a and the position indicated by the dashed line B), the influence range information of the warning event may include boundary position information of the area AB, such as information of the position a and the position B, or may include coordinate information of the area AB, or may include information such as an identifier, a number, or an index corresponding to the coordinate information of the area AB.

As shown in fig. 2, a communication method provided in the embodiment of the present application may be implemented by a server, a first roadside unit, and a terminal device. The method may comprise the steps of:

s101: the server determines a first forwarding rule of the early warning information. The first forwarding rule can be used for instructing a terminal device receiving the early warning information to forward the early warning information according to the first forwarding rule.

S102: and the server sends a first forwarding rule of the early warning information to the first road side unit. The first road side unit is located in the upstream direction of a target area, and the target area is an area which cannot be subjected to early warning through the road side unit.

The area where the warning cannot be performed by the rsu is an area where the warning information broadcast by the rsu cannot be received. Specifically, the area where the early warning cannot be performed by the rsu may include an area where the early warning cannot be broadcast by the rsu due to no rsu coverage. Alternatively, the area where the rsu cannot perform warning may include an area where the rsu cannot perform warning information broadcasting through the V2X message due to a fault or an overload, although the rsu is covered.

The upstream direction of the target area may include a direction opposite to a traffic lane passing direction, where the traffic lane is included in a road where the target area is located. Wherein the target area may cover part or all of the lanes of the road.

In one possible implementation, when the road on which the target area is located includes a first lane and a second lane, and the direction of permitted passage of the first lane is different from the direction of permitted passage of the second lane, the upstream direction includes a direction opposite to the direction of permitted passage of the first lane, and/or the upstream direction includes a direction opposite to the direction of permitted passage of the second lane. For example, as shown in fig. 1(c), when the target area is located in the area EF and the target area covers the lane 1 and/or the lane 2, the road on which the target area is located (i.e., the road shown in fig. 1 (c)) includes the lane 1 and the lane 2, and the direction of the lane 1 is different from the direction of the lane 2, the upstream direction may include the opposite direction of the lane 1, and/or the upstream direction may include the opposite direction of the lane 1, which is allowed to pass. Thus, in this example, RSU1 may be considered to be the corresponding first roadside unit of the target area EF, and/or RSU5 may be considered to be the corresponding first roadside unit of the target area EF.

In another possible implementation, when the road on which the target area is located includes a third lane and the road does not include a lane different from a direction of permitted passage of the third lane, the upstream direction includes a direction opposite to the direction of permitted passage of the third lane.

For example, according to the RSU deployment scenario shown in fig. 1(a), when the target area is located in the area EF and the target area covers lane 1 and/or lane 2, the road where the target area is located includes lane 1 and lane 2, and the direction of traffic allowed in lane 1 is the same as the direction of traffic allowed in lane 2, and the upstream direction includes the opposite direction of the direction of traffic allowed in lane 1, or the upstream direction includes the opposite direction of the direction of traffic allowed in lane 2. Thus, in this example, RSU1 may be considered to be the corresponding first roadside unit of the target area EF.

For another example, according to the RSU deployment scenario shown in fig. 1(b), when the target area is located in the area EF and the target area covers the lane 1 and/or the lane 2, the road where the target area is located includes the lane 1 and the lane 2, and the direction of the lane 1 is the same as the direction of the lane 2, and the upstream direction includes the opposite direction of the lane 1, or the upstream direction includes the opposite direction of the lane 2. Thus, in this example, RSU4 may be considered to be the corresponding first roadside unit of the target area EF.

S103: accordingly, the first road side unit receives the first forwarding rule of the early warning information from the server. And the first road side unit sends a first forwarding rule of the early warning information.

Specifically, the first roadside unit may broadcast a first forwarding rule of the early warning information within a coverage area of the first roadside unit. Alternatively, the first roadside unit may transmit a first forwarding rule of the warning information to the terminal devices within the coverage area of the first roadside unit. For example, the first roadside unit may transmit the first forwarding rule of the warning information through the PC5 or DSRC.

S104: accordingly, the terminal device receives the first forwarding rule. And after receiving the early warning information, the terminal device sends the early warning information according to the first forwarding rule.

By adopting the method, the terminal device can receive the first forwarding rule from the first road side unit at the upstream of the target area and forward the early warning information according to the first forwarding rule, so that the vehicle networking terminal in the target area can receive the early warning information forwarded by the terminal device, and therefore, the vehicle networking terminal can not only pass through the road side unit covering the target area when forwarding the V2X message to the target area, and the reliability of the early warning information forwarding process is improved.

It should be understood that the above server may be implemented by a car networking server as shown in fig. 1(a), 1(b) or 1 (c). The above first road side unit may be implemented by a part or all of RSUs in RSU1, RSU2, or RSU3 shown in fig. 1(a), or by a part or all of RSUs in RSU1, RSU2, or RSU4 shown in fig. 1(b), or by a part or all of RSUs in RSU1, RSU2, or RSU5 shown in fig. 1 (c). The above terminal device may be implemented by a car networking terminal as shown in fig. 1(a), 1(b) or 1 (c).

The first forwarding rule of the warning information in S101 may include a first identifier, where the first identifier is used to instruct a terminal device receiving the warning information to forward the warning information. In addition, the terminal device that receives the warning information may also transmit the received warning information by default.

Before S101 is implemented, the server may further determine the target area, and determine the first roadside unit according to the target area. Wherein the first road side unit is positioned in the upstream direction of the target area.

In one particular example, the target area may be within the impact of the early warning event and the target area is not covered by roadside units. Since no roadside unit is covered in the target area, the early warning information cannot be broadcast by the roadside unit in the area. At this time, the method as shown in fig. 2 may be used to forward the warning information in the target area, so as to improve the reliability of the forwarding process of the warning information.

Specifically, the area without road side unit coverage within the influence range of the early warning event, which is the target area, may be determined according to the influence range of the early warning event and the coverage area of the road side unit around the influence range of the early warning event.

Taking fig. 1(a) as an example, if the influence range of the warning time is the area AB, it can be known from fig. 1(a) that the area DE (i.e., the area between the position indicated by the dashed line D and the position indicated by the dashed line E) is located within the area AB, and no roadside unit covers the area DE, and at this time, the area DE can be determined as the target area. At this time, the internet of vehicles server may regard the RSU2 as the first roadside unit and transmit the first forwarding rule of the warning information to the RSU2 through S101. In addition, the vehicle networking server may also use the RSU1 as the first road side unit and send the first forwarding rule of the warning information to the RSU1 through S101.

It will be appreciated that when the area of influence of the pre-warning event comprises an area where the area AB coincides with lane 1 as shown in fig. 1(a), the target area may comprise an area where the area DE coincides with lane 1; and/or, when the influence range of the warning time includes an area where the area AB coincides with the lane 2, the target area may include an area where the area DE coincides with the lane 2.

In addition, along the above example, when the target area is the area DE, if the RSU is deployed as shown in fig. 1(c), the RSU2 and/or RSU5 may be used as the first road side unit.

In another specific example, the target area may be within the impact range of the early warning event and the rsus covering the target area do not satisfy the specific condition. The specific condition may include an operation state condition and/or a network state condition. When the operation state of the road side unit covering the target area does not meet the operation state condition and/or the network state of the road side unit does not meet the network state condition, if the early warning information is still forwarded in the target area through the road side unit, the early warning information is likely to be unable to be forwarded or unable to be forwarded in time, and therefore the coverage area of the road side unit not meeting the specific condition can be used as the target area incapable of being early warned through the road side unit. At this time, the early warning information can be forwarded in the target area by the method shown in fig. 2, so as to improve the reliability in forwarding the early warning information. Illustratively, the first roadside unit satisfies the particular condition.

Specifically, the coverage area of the roadside unit that does not satisfy the specific condition may be set as the target area.

Still taking fig. 1 as an example, the area of influence of the warning event is an area AB, and if the vehicle networking server determines that the RSU2 does not satisfy the specific condition, the vehicle networking server may use an overlapping area EB of the area AB and an area EF covered by the RSU2 (i.e., an area between the position indicated by the dashed line E and the position indicated by the dashed line B) as the target area. At this time, if according to fig. 1(a), the car networking server may take RSU1 in the upstream direction of RSU2 as the first roadside unit; if according to fig. 1(b), the internet of vehicles server may have RSU4 in the upstream direction of RSU2 as the first roadside unit; if according to fig. 1(c), the internet of vehicles server may have RSU5 and/or RSU1 upstream of RSU2 as the first roadside unit.

It should be understood that the above target area may also be a set of areas within the influence range of the early warning event that are not covered by roadside units and areas that are not covered by roadside units that satisfy certain conditions. For example, as shown in fig. 1(a), the area of influence of the warning event is an area AB, and if the area DE is not covered by the roadside unit and the RSU2 of the coverage area EB does not satisfy a specific condition, the car networking server may use the area DE and the area EB as the target area. At this time, the internet of vehicles server may regard the RSU1 as the first roadside unit and transmit the first forwarding rule of the warning information to the RSU1 through S101.

In one possible example, the server may determine that the rsu does not satisfy the operation state condition according to the operation state information of the rsu. The operation state information of the rsu may include part or all of information such as the information of the type of the message supported and forwarded by the rsu, the number of concurrent messages supported by the rsu, the current number of concurrent messages of the rsu, the cache capacity information of the rsu, or the current number of cache messages of the rsu.

The information of the message type that the road side unit supports forwarding can be used for indicating whether the road side unit supports forwarding of the early warning information. And when the road side unit does not support the forwarding of the early warning information, the server judges that the road side unit does not meet the operating state condition.

The number of concurrent messages supported by the rsu may be used to indicate the number of concurrent messages supported by the rsu. For example, when the number of concurrent messages supported by the roadside unit does not meet (or exceed) the threshold value of the number of concurrent messages supported by the roadside unit, the server determines that the roadside unit does not meet the operating state condition. The rsu current number of concurrent messages may be used to indicate the rsu current number of concurrent messages. For example, when the number of current concurrent messages of the roadside unit does not reach (or exceed) the threshold value of the number of current concurrent messages of the roadside unit, the server determines that the roadside unit does not satisfy the operating state condition. In addition, the server can also judge whether the road side unit meets the operating state condition or not by combining the number of the concurrent messages supported by the road side unit and the current number of the concurrent messages of the road side unit.

For example, when the current number of concurrent messages of the roadside unit reaches (or exceeds) 70% (or another value, such as 80%) of the number of concurrent messages supported by the roadside unit, the roadside unit may be restricted from forwarding the warning information of the non-emergency event, and only the warning information of the emergency event. At this time, when the early warning information of the non-emergency event needs to be forwarded in the coverage area of the road side unit, the server can mark the road side unit as not meeting the operating state condition; when the non-emergency warning information needs to be forwarded in the coverage area of the rsu, the server may not mark the rsu as not meeting the operating condition. For another example, when the current number of concurrent messages of the roadside unit reaches (or exceeds) 80% (or another value, such as 90%) of the number of concurrent messages supported by the roadside unit, the roadside unit does not forward any warning information of the warning event. When the early warning information of the emergency or non-emergency event needs to be forwarded in the coverage area of the road side unit, the server can mark the road side unit as not meeting the operation state condition.

The buffering capacity information of the rsu may be used to indicate the number of messages buffered by the rsu. For example, the server determines that the rsu does not satisfy the operating condition when the number of messages that the rsu supports caching does not meet (or exceed) a threshold of the number of messages that the rsu supports caching. The current number of buffered messages of the rsu may be used to indicate the current number of buffered messages of the rsu. For example, the server determines that the rsu does not satisfy the operating condition when the number of messages currently cached by the rsu does not meet (or exceed) a threshold of the number of messages currently cached by the rsu. The server can also judge whether the road side unit meets the operating state condition or not by combining the number of the messages of the road side unit supporting cache and the number of the messages of the road side unit currently cached.

For example, when the number of messages currently buffered by the roadside unit reaches (or exceeds) 70% (or another value, such as 80%) of the number of messages that the roadside unit supports buffering, the roadside unit may be restricted from forwarding the warning information of the non-emergency event, and only the warning information of the emergency event. At this time, when the early warning information of the non-emergency event needs to be forwarded in the coverage area of the road side unit, the server can mark the road side unit as not meeting the operating state condition; when the non-emergency warning information needs to be forwarded in the coverage area of the rsu, the server may not mark the rsu as not meeting the operating condition. For another example, when the number of messages currently buffered by the roadside unit reaches (or exceeds) 80% (or another value, such as 90%) of the number of messages that the roadside unit supports buffering, the roadside unit does not forward any warning information of the warning event. When the early warning information of the emergency or non-emergency event needs to be forwarded in the coverage area of the road side unit, the server can mark the road side unit as not meeting the operation state condition.

In another possible example, the server may further determine that the road side unit does not satisfy the network status condition according to the network status information of the road side unit. The network state information of the rsu may include information indicating a load state of the short-range communication network of the rsu (e.g., load information of the rsu), and/or information indicating a quality of the short-range communication network of the rsu (e.g., downlink network quality information of the rsu).

In another possible example, the server may further determine that the rsu does not satisfy the specific condition according to the indication information sent by the rsu. Wherein the indication information may be used to indicate that the road side unit does not satisfy the performance state condition and/or the network state condition. The indication information may include an identification of the roadside unit. The indication information may be sent to the server by the road side unit after determining that the road side unit does not satisfy the performance state condition and/or the network state condition. The way that the roadside unit determines that the roadside unit does not satisfy the performance state condition and/or the network state condition can be determined by referring to the server.

In implementations, the server may subscribe to one or more of the above operational status information, network status information, or indication information from one or more of the road side units it manages. Still taking fig. 1(a) as an example, the car networking server may send a subscription request to the RSU1, where the subscription request may be used to subscribe to one or more of the operation status information or the network status information of the RSU1, and the car networking server may determine whether the RSU1 meets a specific condition according to the above information reported by the RSU 1. Taking the operation status information as an example, the car networking server may instruct the RSU1 to report the operation status information of the RSU1 periodically, and at this time, the subscription request may carry the period or information for indicating the period. Alternatively, the subscription request may be used to instruct the RSU1 to report the operation state information after the operation state meets the operation state threshold, and in this case, the subscription request may also be used to instruct the operation state threshold. For example, when the number of messages currently cached by the RSU1 reaches the threshold number of cached messages, the RSU1 may report the number of messages currently cached to the server.

The one or more road side units can report the operation state information and/or the network state information to the server periodically or after meeting the operation state threshold, or the one or more road side units can send the indication information after determining that the road side units do not meet the specific conditions, and the server is not required to send the subscription request. The reporting period and/or the operation state threshold may be indicated by the server, or determined by a protocol or a pre-configured manner.

In addition, the subscription request may be used to instruct the RSU1 to send instruction information to the car networking server after determining that it does not satisfy a specific condition. At this time, the subscription request may also be used to indicate the specific condition. For example, the subscription request may indicate a downlink network quality threshold, the RSU1 may send, after determining that its own downlink network quality does not satisfy the downlink network quality threshold, indication information to the car networking server, where the indication information may be used to indicate that the RSU1 does not satisfy a network status condition, the indication information may carry downlink network quality information of the RSU1, such as a downlink measurement value, and so on.

In implementation, the RSU1 may report the RSU1 identifier when reporting the operation status information, the network status information, or the indication information to the vehicle networking server.

It should be understood that, before implementing S101, the server may send a subscription request to the rsu before determining the first forwarding rule corresponding to the warning information, and determine whether the rsu satisfies a specific condition according to one or more of the network state information or the indication information reported by the rsu, and then store the determination result. Therefore, when the first forwarding rule is determined, whether the road side unit which does not meet the specific condition exists in the management range of the early warning event can be determined according to the judgment result.

For example, the car networking server shown in fig. 1(a) may maintain a list shown in table 1, so as to conveniently record a judgment result of whether each rsu satisfies a specific condition and coverage area information of the rsu, conveniently determine whether the rsu not satisfying the specific condition exists within an influence range of the early warning event according to the list, and determine a target area.

Identification of road side unit	Whether the roadside unit satisfies a specific condition	Coverage area of road side unit
			ID_RSU1	Is that	Region GH
ID_RSU2	Whether or not	Region EF
			ID_RSU3	Is that	Area CD

TABLE 1

According to table 1, if the area AB is the influence range of the warning event, the vehicle networking server may determine that the RSU1 and the RSU2 overlap with the area AB according to the coverage area list of the roadside units in table 1, further determine that the RSU2 does not satisfy the specific condition according to whether the roadside units satisfy the specific condition list, and thereafter, the vehicle networking server may determine that the area EB overlapping with each other is the target area according to the coverage area EF of the RSU2 and the area AB.

For example, when determining the first roadside unit according to the position of the target area, the first roadside unit in the upstream direction of the target area may be determined as the first roadside unit. In other words, the first roadside unit may be the roadside unit closest to the target region in the upstream direction of the target region. By adopting the design, the forwarding efficiency of the first forwarding rule can be improved, and the signaling overhead can be saved. For example, as shown in fig. 1(a), for the road shown in fig. 1, if the target area is an area EB, the first roadside unit RSU1 in the upstream direction of the area EB may be determined as the first roadside unit. For another example, for the RSU deployment mode shown in fig. 1(a), if the target area is the area DE, the first RSU2 on the road side unit in the upstream direction of the area DE may be determined as the first road side unit. For another example, for the RSU deployment mode shown in fig. 1(c), if the target area is the area DE, the RSU closest to the area DE in the RSU2 and RSU5 in the upstream direction of the area DE may be determined as the first roadside unit. When the RSU closest to the region DE in the RSU2 and the RSU5 is determined, the distance L1 between the position of the RSU2 and the position E and the distance L2 between the position of the RSU5 and the position D are compared, and if L1 is larger than L2, the RSU5 can be used as a first road side unit; if L1 is less than L2, RSU2 may be the first roadside unit; if L1 is equal to L2, either RSU2 or RSU5 may be the first road side unit.

Several ways of determining the first forwarding rule according to the location of the target area provided by the embodiments of the present application are described below by way of examples.

In a first manner, when the first forwarding rule includes first time information, the server may determine the first time information according to the coverage area of the first road-side unit, the range of the target area, and the vehicle speed information, where the first time information may be used to instruct the terminal device to forward start time and/or end time of the warning information.

The vehicle speed information is used for indicating the vehicle speed of the vehicle to which the terminal device belongs. The vehicle speed information may be an average vehicle speed, a highest speed limit, or a lowest speed limit of the current road. The vehicle speed information can be configured locally in the server, or reported to the server by a road side unit deployed on the current road.

Still taking fig. 1(a) as an example, assuming that the target area is an area EB, the internet of vehicles server may determine a distance between a boundary position H of the RSU1 and a boundary position B of the area EB according to the area GH and the area EB covered by the RSU1, and may determine a time period required for the vehicle to travel from the position H to the position B according to the distance and the vehicle speed information, that is, after the time period for receiving the first forwarding rule reaches the time period, the first internet of vehicles terminal may start forwarding the warning information, so that a start time for the first internet of vehicles terminal to forward the warning information may be determined.

Or, the distance between the boundary position G of the RSU1 and the boundary position B of the area EB can be determined according to the area GH and the area EB covered by the RSU1, and the time length required for the vehicle to travel from the position G to the position B can be determined according to the distance and the vehicle speed information, that is, after the time length for receiving the first forwarding rule reaches the time length, the first vehicle networking terminal can start forwarding the warning information. Optionally, the vehicle networking server may determine the starting time of the first vehicle networking terminal for forwarding the warning information according to the highest speed limit or the average speed of the current road.

In addition, following the above example, the internet of vehicles server may determine the distance between the boundary position H of the RSU1 and the boundary position E of the area EB according to the area GH and the area EB covered by the RSU1, and may determine the time length required for the vehicle to travel from the position H to the position E according to the distance and the vehicle speed information, that is, after the time length of receiving the first forwarding rule reaches the time length, the first internet of vehicles terminal ends forwarding the warning information, so that the end time of forwarding the warning information by the first internet of vehicles terminal may be determined. Optionally, the vehicle networking server may determine the starting time of the first vehicle networking terminal for forwarding the warning information according to the lowest speed limit or the average vehicle speed of the current road.

In a second mode, when the first forwarding rule includes location information, the server may determine the location information according to the coverage area of the first roadside unit and the range of the target area, and the location information may be used to instruct the terminal device to forward a start location and/or an end location of the warning information.

Still taking fig. 1(a) as an example, assuming that the target area is area EB, the car networking server can determine the distance between boundary position H of RSU1 and boundary position B of area EB according to area GH covered by RSU1 and area EB. After the first forwarding rule is received, the first vehicle networking terminal can start sending the early warning information after the driving distance of the vehicle where the first vehicle networking terminal is located reaches the distance, and the distance is the starting position of the vehicle networking terminal for forwarding the early warning information.

Alternatively, the distance between boundary position G of RSU1 and boundary position B of region EB may be determined based on region GH and region EB covered by RSU 1. After the first forwarding rule is received, the first vehicle networking terminal can start sending the early warning information after the driving distance of the vehicle where the first vehicle networking terminal is located reaches the distance, and the distance is the starting position of the vehicle networking terminal for forwarding the early warning information.

In addition, following the above example, the internet of vehicles server may determine the distance between boundary position H of RSU1 and boundary position E of region EB according to region GH and region EB covered by RSU 1. After the first forwarding rule is received, the first vehicle networking terminal can finish sending the early warning information after the driving distance of the vehicle where the first vehicle networking terminal is located reaches the distance, and the distance is the end position of the vehicle networking terminal for forwarding the early warning information.

It should be understood that the first and second manners above can be implemented separately, for example, the car networking server can determine the first time information according to the first manner and carry the first time information in the first forwarding rule. For example, the first vehicle networking server may determine, according to the first mode, first time information used for indicating a start time of forwarding the warning information by the first vehicle networking terminal, and determine, according to the second mode, location information used for indicating a start location of forwarding the warning information by the first vehicle networking terminal, and carry the first time information and the location information in the first forwarding rule.

For example, the first forwarding rule referred to in S101 may further include a forwarding frequency for instructing the terminal device to forward the warning information, for example, the forwarding frequency is 10 seconds (S), 30 seconds, or 60 seconds, and so on. The forwarding frequency can be set by the server according to the priority information of the early warning event, and higher forwarding frequency can be set for more urgent early warning events.

The first forwarding rule may further include a forwarding priority for indicating a priority at which the terminal device forwards the plurality of pieces of warning information. For example, when there are a plurality of pieces of warning information that need to be forwarded by the terminal apparatus, the terminal apparatus may preferentially transmit warning information having a higher forwarding priority. The forwarding priority of the early warning information can be set by the server according to the priority information of the early warning event, for example, the forwarding priority is the same as the priority of the predicted time.

In the implementation of S101, the first forwarding rule of the warning information may carry an identifier of the warning information, or the first forwarding rule of the warning information and the warning information may be carried in the same message and sent. Thereby, the early warning information can be associated with the first forwarding rule.

In this embodiment of the present application, the server may further instruct the first router to send the start time and/or the end time of the first forwarding rule through S103. Specifically, before S103, the server may further send, to the first road-side unit, second time information, where the second time information may be used to indicate a start time and/or an end time for the first internet-of-vehicles terminal to send the first forwarding rule, so that the first road-side unit may send the first forwarding rule according to the start time and/or the end time indicated by the second time information. The server may determine the second time information according to a start time and/or an end time of the early warning event after determining that the type of the early warning event is a non-emergency event.

In one possible example, when determining the second time information, the server may determine the start time of the warning event as the start time of the first roadside unit sending the first forwarding rule, and/or the server may send the end time of the warning event as the end time of the first forwarding rule. Or, the server may use a first specific time point before the start time of the early warning event as the start time of the first vehicle networking terminal for sending the first forwarding rule, where a time difference between the first specific time point and the start time of the early warning event is a first duration, and a value of the first duration may be a set value, or the server determines, according to the network state of the first roadside unit, that the worse the network state of the first roadside unit is, the longer the first duration is. Or, the server may use a second specific time point before the end time of the early warning event as the end time of the first vehicle networking terminal for sending the first forwarding rule, where a time difference between the second specific time point and the start time of the early warning event is a second duration, and a value of the second duration may be a set value, or the server determines, according to the network state of the first route side unit, that the worse the network state of the first route side unit is, the shorter the second duration is. Or, the server may use a third specific time point after the end time of the early warning event as the end time of the first vehicle networking terminal for sending the first forwarding rule, where a time difference between the third specific time point and the start time of the early warning event is a third time length, and a value of the third time length may be a set value or determined by the server.

In addition, the server may further instruct the first road side unit to send the first forwarding rule through S103 immediately after receiving the first forwarding rule. Specifically, before S103, the server may send a second identifier to the first router unit, where the second identifier is used to instruct the first router unit to start forwarding the first forwarding rule since receiving the first forwarding rule. In other words, the second identifier is used to instruct the first road side unit to send the first forwarding rule immediately after receiving the first forwarding rule. The server may send the second identifier to the first roadside unit after determining that the type of the early-warning event is an emergency event.

Still taking fig. 1(a) as an example, the communication method provided in the embodiment of the present application is described below with reference to the flowchart shown in fig. 3, where the communication method may include the following steps:

s201: the vehicle networking server sends subscription requests to the RSU1, RSU2, and RSU3, respectively. The present application does not limit the timing when the car networking server sends the subscription request to each of the RSU1, RSU2, and RSU 3. Accordingly, RSU1, RSU2, and RSU3 receive subscription requests, respectively.

The subscription request is used for instructing the RSU1 to report at least one of operation state information, network state information or indication information of the RSU1 to the vehicle networking server. The operating state information may be used by the vehicle networking server to determine whether the RSU1 satisfies the operating state condition. The network status information may be used by the vehicle networking server to determine whether the RSU1 satisfies the network status condition. The indication information may be used to indicate that the RSU1 does not satisfy the operational status condition and/or the network status condition.

S202: after judging that the RSU2 does not satisfy the network state condition, the RSU2 sends the identification of the RSU2 and indication information to the Internet of vehicles server, wherein the indication information is used for indicating that the RSU2 does not satisfy the network state condition. Accordingly, the vehicle networking server receives the identification of the RSU2 along with the indicating information.

S203: the vehicle networking server records the RSU2 as a road side unit that does not satisfy certain conditions.

For example, if the car networking server stores the list shown in table 1, the car networking server may refresh the list, configure "whether the roadside unit satisfies the specific condition" to "no" corresponding to ID _ RSU 2.

S204: when an early warning event needing early warning occurs, the RSU1 reports the information of the early warning event to the Internet of vehicles server. Correspondingly, the vehicle networking server receives the information of the early warning event reported by the RSU 1. The message of the early warning event may include early warning information corresponding to the early warning event.

The RSU1 can report the information of the early warning event to the Internet of vehicles server through RSI information.

For example, the RSU1 may report the identifier of the warning event to the car networking server, and the car networking server determines whether the warning event is an emergency event or a non-emergency event according to the identifier of the warning event, that is, the car networking server determines priority information of the warning event according to the identifier of the warning event. Alternatively, the RSU1 may determine whether the type of the pre-alert event is an emergency event or a non-emergency event based on the identification of the pre-alert event and pre-alert the internet-of-vehicles server device of the priority information for the event. In addition, the information of the warning event may also be reported by RSU2 or RSU3 or other road side units or processes.

S205: the vehicle networking server determines the coverage area of the RSU2 as a target area and configures a first forwarding rule of the early warning information.

It should be understood that the first forwarding rule may contain an identification of the early warning information to indicate the early warning information having the identification. Alternatively, the first forwarding rule may include priority information of the early warning event to indicate early warning information corresponding to an early warning event of a certain priority. For example, the first forwarding rule may include one or more of a first identification, first time information, location information, forwarding frequency, or forwarding priority.

In S205, the internet of vehicles server may perform one or more of the following configurations to implement the configuration of the first forwarding rule:

first, the vehicle networking server configures a first identifier. The first identification is used for indicating the vehicle networking terminal to forward the early warning information according to the first forwarding rule.

Secondly, when the early warning event is a non-emergency event, the vehicle networking server can determine first time information and/or position information of the early warning information forwarded by the vehicle networking terminal according to the position of the target area. Specifically, when determining the first time information of the vehicle networking terminal for forwarding the warning information, the first time information may be determined according to the coverage area of the RSU1 located in the upstream direction of the target area, the range of the target area, and the vehicle speed information. When determining the location information of the early warning information forwarded by the vehicle networking terminal, the location information may be determined according to the coverage area of the RSU1 located in the upstream direction of the target area and the range of the target area.

Thirdly, the vehicle networking server configures the forwarding frequency and/or the forwarding priority of the early warning information.

It should be understood that the internet of vehicles server may perform at least two of the above configurations sequentially or simultaneously.

In addition, when the pre-warning event is a non-emergency event, the internet of vehicles server may further configure second time information, which may be used to instruct the RSU1 located in the upstream direction of the target area to transmit the start time and/or the end time of the first forwarding rule.

S206: the internet of vehicles server transmits a first forwarding rule of the warning information to the RSU1 located in the upstream direction of the target area. Accordingly, the RSU1 receives the first forwarding rule.

Illustratively, the internet of vehicles server may also send the warning information to the RSU 1. The first forwarding rules of the early warning information and the early warning information can be carried in the same message or carried in different messages respectively.

For example, when the warning event is an emergency event, the internet-of-vehicles server may further transmit a second identifier to the RSU1, where the second identifier is used to instruct the RSU1 to immediately transmit the first forwarding rule of the warning information. Alternatively, the internet of vehicles server may also send second time information to the RSU1 when the pre-warning event is a non-emergency event. The second time information and the first forwarding rule of the warning information may be carried in the same message or carried in different messages respectively.

S207: the RSU1 sends a first forwarding rule for the warning information. Accordingly, a first internet-of-vehicles terminal within the coverage area of the RSU1 receives a first forwarding rule for the warning information.

Specifically, the RSU1 transmits the first forwarding rule of the warning information by broadcasting. Alternatively, the RSU1 sends the first forwarding rule of the warning information to the first internet-of-vehicles terminal within the coverage area of the RSU1 in a directional manner.

For example, if the RSU1 also receives the warning information from the internet of vehicles server, the RSU1 may also send the warning information. The first forwarding rules of the early warning information and the early warning information can be carried in the same message or carried in different messages respectively.

In a specific example of S207, when the RSU1 further receives a second identifier from the internet of vehicles server, the RSU1 performs transmission of the first forwarding rule immediately after receiving the first forwarding rule, wherein the second identifier is used for instructing the road side unit to forward the first forwarding rule of the warning information immediately.

In another specific example of S207, when the RSU1 further receives the second time information from the internet of vehicles server, the RSU1 performs sending of the first forwarding rule according to the start time and/or the end time indicated by the second time information after receiving the first forwarding rule.

S208: and the first car networking terminal sends the early warning information according to the first forwarding rule. Wherein, the first vehicle networking terminal can also receive the early warning information from the RSU 1.

In a specific example of S208, the first vehicle networking terminal may default to send the warning information according to the received first forwarding rule, and at this time, the first vehicle networking terminal may send the warning information according to the first forwarding rule regardless of whether the first forwarding rule carries the first identifier.

In another specific example of S208, the first internet-of-vehicles terminal sends the warning information according to the first forwarding rule only after determining that the first forwarding rule includes the first identifier.

Correspondingly, the second vehicle networking terminal located in the target area can receive the early warning information sent by the first vehicle networking terminal.

According to the process, the early warning information can be forwarded to the second vehicle networking terminal in the target area through the first vehicle networking terminal.

In the implementation of the application, the car networking server may further send a second forwarding rule of the warning information to the third route side unit, the third route side unit may send the second forwarding rule of the warning information in a coverage area of the third route side unit, the second forwarding rule may include a third identifier, and the third identifier may be used to indicate that the car networking terminal receiving the second forwarding rule of the warning information does not forward the warning information. In particular, the third side unit may be located within the impact range of the pre-warning event, for example, the third side unit may include an RSU3 as shown in fig. 1 (a). In addition, the third route side unit may satisfy a specific condition. The setting mode of the specific condition can be referred to the above description, and the car networking server can judge whether the third route side unit meets the specific condition according to the method described above.

Illustratively, the third route side unit is located within the influence range of the early warning event and located in the downstream direction of the target area. The downstream direction is the opposite direction of the upstream direction, or the upstream direction is the traffic-allowed direction of the lane, wherein the lane is the lane included in the road where the target area is located. At this time, the vehicle-mounted terminal in the coverage area of the third route side unit is not required to forward the early warning information.

By adopting the method, the vehicle networking server can send the second forwarding rule to the vehicle networking terminal in the area covered by the road side unit through the road side unit so as to definitely indicate that the vehicle networking terminal which does not need to receive the early warning information forwards the early warning information, thereby saving signaling overhead. In addition, the vehicle networking terminal receiving the early warning information can also default to not forward the received early warning information. Or, if the vehicle networking terminal does not default to forward the received early warning information, or the vehicle networking terminal defaults to forward the received early warning information, the vehicle networking terminal may not forward the early warning information according to a third identifier in a second forwarding rule after receiving the second forwarding rule of the early warning information.

When the vehicle networking server indicates, through the second forwarding rule of the warning information, that the vehicle networking terminal does not forward the warning information, the following steps may be further included after the step S204 in the flow illustrated in fig. 3:

s209: the vehicle networking server sends a second forwarding rule of the warning information to the RSU 3. Accordingly, the RSU3 receives the second forwarding rule for the warning information.

The second forwarding rule may include a third identifier, where the third identifier is used to indicate that the car networking terminal receiving the early warning information does not forward the early warning information. The warning information may be reported by the RSU1 in step S204.

It should be appreciated that the second forwarding rule contains an identification of the early warning information to indicate the early warning information with the identification. Alternatively, the second forwarding rule may include priority information for the pre-warning event to indicate pre-warning information corresponding to a pre-warning event of a certain priority (e.g., emergency or non-emergency).

For example, the internet of vehicles server may further transmit third time information to the RSU3, where the third time information may be used to indicate a start time and/or an end time of the second forwarding rule for the RSU3 to transmit the warning information. The configuration mode of the third time information can refer to the introduction of the configuration of the second time information by the vehicle networking server. Or, the vehicle networking server may further send a fourth identifier to the RSU3, where the fourth identifier may be used to instruct the third route side unit to start sending the second forwarding rule of the warning information since the second forwarding rule of the warning information is received.

For example, the above RSU3 may be located within the scope of the impact of the early warning event. Further, the above RSU3 may be located within the scope of the impact of the early warning event and downstream of the target zone.

S210: RSU3 sends a second forwarding rule for the warning information. Accordingly, the vehicle networking terminals in the coverage area of the RSU3 receive the second forwarding rule of the warning information.

For example, if the internet of vehicles server further transmits the third time information to the RSU3, the RSU3 may perform the transmission of the second forwarding rule according to the third time information. By adopting the method, the RSU3 can send the second forwarding rule according to the indicated time, and the RSU3 is prevented from always forwarding the second forwarding rule of the early warning information so as to save signaling overhead.

In addition, if the vehicle networking server also sends the four identifications to the RSU3, the RSU3 may send the second forwarding rule immediately after receiving the second forwarding rule. By adopting the method, the RSU3 can timely transmit the second forwarding rule, and the forwarding of the early warning information by the Internet of vehicles terminal in the area covered by the RSU3 is avoided, so that the signaling overhead is saved.

S211: and the vehicle networking terminals in the coverage area of the RSU3 do not forward the early warning information after receiving the early warning information according to the third identification in the second forwarding rule.

Based on the same technical concept as that of the above method embodiment, an embodiment of the present application further provides a communication device, which may have the functions of any one of the server, the first roadside unit, the second roadside unit, the third roadside unit, or the terminal device in the above method embodiment, and may be configured to perform the steps performed by any one of the server, the first roadside unit, the second roadside unit, the third roadside unit, or the terminal device provided in the above method embodiment. The function can be realized by hardware, and can also be realized by software or hardware to execute corresponding software. The hardware or software includes one or more modules corresponding to the functions described above.

In one possible implementation, the communication device 400 shown in fig. 4 may serve as a server according to the above method embodiment, and perform the steps performed by the server in the above method embodiment. As shown in fig. 4, the communication device 400 may include a communication module 401 and a processing module 402, wherein the communication module 401 and the processing module 402 are coupled to each other. The communication module 401 may be used to support the communication device 400 for communication, and the communication module 401 may have a wired communication function, for example, capable of communicating with a road side unit in a wired manner. The processing module 402 may be used to support the communication apparatus 400 to perform the processing actions in the above method embodiments, including but not limited to: generate information, messages, etc. sent by the communication module 401, and/or demodulate and decode signals received by the communication module 401.

In performing the steps performed by the server in the above method embodiment, the processing module 402 may be configured to determine a first forwarding rule of the warning information, where the first forwarding rule is used to instruct a terminal device receiving the warning information to send the warning information according to the first forwarding rule. The communication module 401 may be configured to send the first forwarding rule to the first roadside unit. The first road side unit is located in the upstream direction of a target area, the upstream direction is the opposite direction of the traffic lane allowing passing direction, the traffic lane is the traffic lane included in the road where the target area is located, and the target area is an area which cannot be warned by the road side unit.

When the first forwarding rule includes the first time information, the processing module 402 may further be configured to determine the first time information according to a coverage area of the first road side unit, a range of the target area, and vehicle speed information, where the vehicle speed information is used to indicate a vehicle speed of a vehicle to which the terminal device belongs.

When the first forwarding rule includes the location information, the processing module 402 may be further configured to determine the location information according to a coverage area of the first roadside unit and a range of the target area.

In a possible example, if the target area is located within an influence range of an early warning event corresponding to the early warning information, and the second roadside unit covering the target area does not satisfy a specific condition, where the specific condition includes an operating state condition, the processing module 402 may be further configured to determine that the second roadside unit does not satisfy the operating state condition according to the operating state information of the second roadside unit. The operation state information of the second road side unit comprises part or all of the following information: the second road side unit supports the information of the forwarded message type; or, the number of concurrent messages supported by the second roadside unit; or, the current number of concurrent messages of the second road side unit; or, the caching capacity information of the second road side unit; or the current cache message number of the second route side unit.

In another possible example, if the target area is located within an influence range of an early warning event corresponding to the early warning information, and the second roadside unit covering the target area does not satisfy a specific condition, where the specific condition includes a network state condition, the processing module 402 may be further configured to determine that the second roadside unit does not satisfy the network state condition according to the network state information of the second roadside unit. Wherein the network state information of the second roadside unit includes part or all of the following information: information indicating a load status of the short-range communication network of the second roadside unit; or, information indicating the quality of the near field communication network of the second roadside unit.

Optionally, the communication module 401 may further be configured to: sending second time information to the first road side unit, wherein the second time information is used for indicating the starting time and/or the ending time of the first road side unit for sending the first forwarding rule; or sending a second identifier to the first road side unit, where the second identifier is used to indicate that the first road side unit starts to forward the first forwarding rule since the first road side unit receives the first forwarding rule.

The communication module 401 may further be configured to send a second forwarding rule of the warning information to a third route side unit, where the second forwarding rule includes a third identifier, and the third identifier is used to indicate a terminal device that receives the warning information not to forward the warning information.

The communication module 401 may also be configured to: sending third time information to the third route side unit, where the third time information is used to indicate a start time and/or an end time of sending the second forwarding rule by the third route side unit; or, sending a fourth identifier to the third route side unit, where the fourth identifier is used to instruct the third route side unit to start sending the second forwarding rule since the third route side unit receives the second forwarding rule. The third route side unit may be located in a downstream direction of the target area, where the downstream direction is a lane passing-permitted direction, and the lane is a lane included in a road where the target area is located. In other words, the downstream direction is opposite the upstream direction.

The communication module 401 may further be configured to send a subscription request to the rsu, and receive one or more of operation status information, network status information, or indication information of the rsu sent by the rsu. The processing module 402 may further determine whether the rsu does not satisfy the specific condition according to one or more of the operation status information, the network status information, or the indication information of the rsu.

In addition, when the communication device shown above is implemented by hardware components, the communication device may include a communication interface and a processor. Wherein the communication interface is used for the communication device to communicate. The processor may be configured to read and call a program stored in the memory to perform the steps performed by the server in the above method implementation. Additionally, the communication device may further include a memory coupled to the processor for storing the program described above. Illustratively, the processor may be configured to read and invoke programs stored in the memory to perform the steps performed by the processing module 402. The communication interface may be used to perform the steps performed by the communication module 401 above.

Illustratively, when the steps performed by the server in the above method embodiments are performed, the structure of a communication device provided in the embodiments of the present application may be as shown in fig. 5. According to fig. 5, the communication device 500 may comprise at least one processor 501, a communication bus 502, a memory 503 and at least one communication interface 504. The communication device 500 may be a general purpose computer or server or a special purpose computer or server.

The processor 501 may be a general-purpose Central Processing Unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more ics for controlling the execution of programs in accordance with the present disclosure. The processor 501 may be used to perform the steps performed by the processing module 402 above.

The communication bus 502 may include a path for communicating information between the aforementioned components.

The communication interface 504 may be any transceiver or IP port or bus interface, etc. for communicating with internal or external devices or apparatuses or communication networks, such as ethernet, Radio Access Network (RAN), Wireless Local Area Network (WLAN), etc. If the device is a functional unit integrated in the vehicle, the communication interface 504 includes one or more of a transceiver for communication with a Network outside the vehicle, a bus interface for communication with other internal units in the vehicle (e.g., a Controller Area Network (CAN) bus interface), and the like. The communication interface 504 may be used to perform the steps performed by the communication module 401 above.

The memory 503 may be, but is not limited to, a read-only memory (ROM) or other type of static storage device that may store static information and instructions, a Random Access Memory (RAM) or other type of dynamic storage device that may store information and instructions, an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disk storage, optical disk storage (including compact disc, laser disc, optical disc, digital versatile disc, blu-ray disc, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory may be self-contained and coupled to the processor via a bus. The memory may also be integral to the processor.

The memory 503 is used for storing application program codes for executing the scheme of the application, and the processor 501 controls the execution. Processor 501 is configured to execute application code stored in memory 503 to implement the functionality of the vehicle-to-enterprise server, the internet of vehicles server, or various credential servers of the method of the present patent.

In particular implementations, processor 501 may include one or more CPUs such as CPU0 and CPU1 in fig. 5 as an example.

In particular implementations, communication device 500 may include multiple processors, such as processor 501 and processor 508 in fig. 5, for example, as an example. Each of these processors may be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor. A processor herein may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).

In one implementation, the communications apparatus 500 may further include an output device 505 and an input device 506. An output device 505, which is in communication with the processor 501, may display information in a variety of ways. For example, the output device 505 may be a Liquid Crystal Display (LCD), a Light Emitting Diode (LED) display device, a Cathode Ray Tube (CRT) display device, a projector (projector), or the like. The input device 506 is in communication with the processor 501 and can accept user input in a variety of ways. For example, the input device 506 may be a mouse, a keyboard, a touch screen device, or a sensing device, among others.

When the device shown in fig. 5 is a chip, the function/implementation process of the communication interface 504 may also be implemented by pins or circuits, and the memory is a storage unit in the chip, such as a register, a cache, and the like, and the storage unit may also be a storage unit located outside the chip.

Illustratively, the communication module 401 described above in fig. 4 may be constituted by the communication interface 504 shown in fig. 5. The processing module 402 shown in fig. 4 may be composed of a processor 501 and a memory 503.

As shown in fig. 6, an embodiment of the present application further provides a communication apparatus 600, where the communication apparatus 600 may be used to perform the steps performed by the first routing unit, the second routing unit, or the third routing unit in the above method embodiments. As shown in fig. 6, the communication device 600 may include a communication module 601 and a processing module 602. The communication module 601 and the processing module 602 are coupled to each other. The communication module 601 may be used to support the communication device 600 to perform communication, and the communication module 601 may have a wired communication function, for example, to communicate with the above server in a wired manner. And/or, the communication module 601 may have a wireless communication function, and may be capable of communicating with a terminal apparatus by means of, for example, the PC5 or DSRC. The processing module 602 may be used to support the communication device 600 to perform the processing actions in the above method embodiments, including but not limited to: generate information, messages, etc. sent by the communication module 601, and/or demodulate and decode signals received by the communication module 601.

When the steps executed by the first route side unit in the above method embodiment are executed, the communication module 601 may be configured to receive a first forwarding rule of the warning information from the server, where the first forwarding rule is used to instruct a terminal device that receives the warning information to send the warning information according to the first forwarding rule. The communication module 601 may also be configured to send the first forwarding rule. The communication device 600 may be located in an upstream direction of a target area, where the upstream direction is a direction opposite to a traffic lane passing-permitted direction, the traffic lane is a traffic lane included in a road where the target area is located, and the target area is an area where early warning cannot be performed by a roadside unit.

The communication module 601 is further configured to receive second time information from the server, and send the first forwarding rule according to the second time information, where the second time information is used to indicate a start time and/or an end time of sending the first forwarding rule by the communication apparatus 600.

The communication module 601 is further configured to receive a third identifier from the server, and start forwarding the first forwarding rule after receiving the first forwarding rule according to the third identifier.

The communication module 601 is specifically configured to broadcast the first forwarding rule and/or send the first forwarding rule to terminal devices in a coverage area of the communication device 600.

The communication device 600 may be the first rsu in the upstream direction of the target area.

The communication module 601 may be further configured to receive a subscription request from the server, and send one or more of operation status information, network status information, or indication information of the road side unit to the server according to the subscription request. The processing module 602 may further determine whether the communication device 600 satisfies a specific condition according to the operation status information and the network status information of the communication device 600, and if not, the communication module 601 may further be configured to send an indication message to the server.

In performing the steps performed by the second roadside unit in the above method embodiments, the communication module 601 may be configured to receive a subscription request from the server. The communication module 601 may be further configured to send one or more of operation status information, network status information, or indication information according to the subscription request. The subscription request may be used to request the second-way unit to report the operation state information and/or the network state information periodically, or the subscription request may be used to request the second-way unit to report the indication information after determining that the second-way unit does not satisfy the specific condition. The processing module 602 may be configured to determine whether the communication apparatus 600 satisfies a specific condition, and if not, the communication module 601 may further be configured to send an indication message to the server.

In performing the steps performed by the third-way side unit in the above method embodiments, the communication device 600 may include a communication module 601 and a processing module 602 coupled to each other, where the communication module 601 may be used to support the communication device 600 for communication, such as communication via wired and/or wireless manner. The processing module 602 may be used for the communication device 600 to perform processing operations, such as generating information/messages that need to be transmitted or processing received signals to obtain information/messages.

The communication module 601 may be configured to receive a second forwarding rule of the warning information from the server, where the second forwarding rule includes a third identifier, and the third identifier is used to instruct a terminal device receiving the warning information not to forward the warning information. The communication module 601 may also send the second forwarding rule. The third road side unit can be located in the downstream direction of a target area, the upstream direction is the traffic-lane allowing direction, the traffic lane is the traffic lane included in the road where the target area is located, and the target area is an area which cannot be warned by the road side unit.

The communication module 601 may further receive third time information from the server, and send the second forwarding rule according to the third time information, where the third time information is used to indicate a start time and/or an end time of sending the second forwarding rule by the second roadside unit.

The communication module 601 may further receive a fourth identifier from the server, and start forwarding the second forwarding rule after receiving the second forwarding rule according to the fourth identifier.

The communication module 601 may also broadcast the second forwarding rule and/or send the second forwarding rule to terminal devices within the coverage area of the third routing-side unit.

The communication module 601 may be used to receive a subscription request from a server. The communication module 601 may be further configured to send one or more of operation status information, network status information, or indication information to the server according to the subscription request. The subscription request may be used to request the second-way unit to report the operation state information and/or the network state information periodically, or the subscription request may be used to request the second-way unit to report the indication information after determining that the second-way unit does not satisfy the specific condition. The processing module 602 may be configured to determine whether the communication apparatus 600 satisfies a specific condition, and if not, the communication module 601 may further be configured to send an indication message to the server.

In addition, when the above-illustrated communication device is implemented by hardware components, the communication device may include a communication interface, a transceiver, and a processor. Wherein, the communication interface can be used for the communication device to carry out wired communication. The transceiver may be used for wireless communication by a communication device. For example, a transceiver may include an antenna and a radio frequency circuit (or radio frequency unit). The radio frequency circuit can be used for conversion between the baseband signal and the radio frequency signal and processing the radio frequency signal. The antenna may be used for transceiving radio frequency signals in the form of electromagnetic waves. The processor may be configured to read and call a program stored in the memory to perform the processing steps performed by the server in the above method implementation. Additionally, the communication device may further include a memory coupled to the processor for storing the program described above. Illustratively, the processor may be configured to read and call a program stored in the memory to perform the steps performed by the processing module 602. In other words, the above processing module 602 may be constituted by a processor or a processor and a memory. The communication interface and transceiver may be used to perform the steps performed by the communication module 601 above. In other words, the above communication module 601 may be constituted by a communication interface and a transceiver.

Illustratively, when the steps performed by the server in the above method embodiments are performed, the structure of a communication device provided in the embodiments of the present application may be as shown in fig. 7. The communication device 700 may be a general purpose computer or server or a special purpose computer or server. According to fig. 7, the communication device 700 may comprise at least one processor 701, a communication bus 702, a memory 703, at least one communication interface 704 and a transceiver 705.

The communication bus 702 may be used to communicate with each component of the communication apparatus 700, so as to realize information transmission between each component of the communication apparatus 700. The processor 701 may be used to read and call programs stored in the memory 703 to perform the steps performed by the processing module 602 above.

The communication interface 704 and the transceiver 705 can be used for the communication apparatus 700 to communicate with external devices and apparatuses. Specifically, the communication device 700 can be used to communicate with devices and apparatuses such as a server in a wired manner to perform the step of communicating with the server in the steps performed by the communication module 601. The transceiver 705 may be used for the communication device 700 to communicate wirelessly, for example, for performing the steps of communicating with a terminal device among the steps performed by the communication module 601 above.

Illustratively, the communication module 601 described above in fig. 6 may be formed by at least one communication interface 704 and a transceiver 705. The processing module 602 shown in fig. 6 may be composed of at least one processor 701 and a memory 703.

In one possible implementation manner, the communication device 800 shown in fig. 8 may serve as a terminal device according to the foregoing method embodiment, and perform the steps performed by the terminal device in the foregoing method embodiment. For example, the terminal device may include the first car networking terminal or the second car networking terminal described herein. As shown in fig. 8, the communication device 800 may include a communication module 801 and a processing module 802, wherein the communication module 801 and the processing module 802 are coupled to each other. The communication module 801 may be used to support the communication device 800 for communication, and the communication module 801 may have a wireless communication function. The processing module 802 may be used to support the communication device 800 to perform the processing actions in the above method embodiments, including but not limited to: generate information, messages to be sent by the communication module 801, and/or demodulate and decode signals received by the communication module 801, and so on.

For example, the communication module 801 may be configured to receive a first forwarding rule of the warning information from a first roadside unit, and after receiving the warning information, the communication module 801 may be further configured to send the warning information according to the first forwarding rule. The first road side unit can be located in the upstream direction of a target area, the upstream direction is the opposite direction of the traffic lane allowing passing direction, the traffic lane is the traffic lane included in the road where the target area is located, and the target area is an area which cannot be warned by the road side unit.

The communication module 801 may also be configured to receive the warning information from the first roadside unit.

The communication module 801 may further be configured to receive a second forwarding rule of the warning information from a third route side unit, where the second forwarding rule includes a third identifier, and the third identifier is used to instruct a terminal device receiving the warning information not to forward the warning information. The third path side unit may be located in a downstream direction of the target area.

In another implementation, the communication device provided in the embodiments of the present application may also be formed by hardware components, such as a processor, a memory, or a transceiver.

When the communication apparatus is the above terminal apparatus, the configuration thereof may also be as shown in fig. 9. For easy understanding and illustration, fig. 9 illustrates the structure of the communication apparatus 900 by taking a mobile phone as an example. As shown in fig. 9, the communication device 900 may include a processor 901, a memory 902, and a transceiver 903.

The processor 901 can be used for processing a communication protocol and communication data, controlling the first terminal device, executing a software program, processing data of the software program, and the like. The memory 902 may be used to store a program and data, and the processor 901 may execute the method performed by the first terminal device in the embodiment of the present application based on the program.

The transceiver 903 may include a radio frequency unit and an antenna. The radio frequency unit can be used for converting the baseband signal and the radio frequency signal and processing the radio frequency signal. The antenna may be used for transceiving radio frequency signals in the form of electromagnetic waves. In addition, only the rf unit can be regarded as the transceiver 903, and then the communication device 900 may include the processor 901, the memory 902, the transceiver 903, and an antenna.

In addition, the communication device 900 may also include an input/output device 904, such as a touch screen, a display screen, or a keyboard, which may be used to receive data input by a user and to output data to the user. It should be noted that some kinds of communication devices may not have input/output devices.

It should be understood that the above communication module 801 may have the structure shown in the transceiver 903, i.e. include a radio frequency unit and an antenna; alternatively, the communication module 801 may include the above radio frequency unit. The above processing module 802 may include the processor 901, or include the processor 901 and the storage 902.

The above communication apparatus 900 may also be constituted by a chip. For example, the chip contains a processor 901. In addition, the chip may further include a memory 902 and a transceiver 903, wherein any of the memory 902, the transceiver 903 and the processor 901 may be coupled to each other.

The transceiver 903 may be configured to perform the steps performed by the communication module 801 when performing the method according to the embodiment of the present application. And the steps performed by the above processing module 802 are performed by the processor 901 calling a program stored in the storage 902.

It should be understood that the components included in the above embodiments for the communication device are illustrative, and are merely one possible example, and that the actual implementation thereof may have another configuration. In addition, each component in the above communication apparatus may be integrated into one module, or may exist separately and physically. The integrated module may be implemented in the form of hardware or software functional module, and should not be construed as limited to the structure shown in the above drawings.

Based on the same concept as the method embodiment, the application also provides a communication system, which can comprise the server, the first road side unit and the terminal device. The communication system may be used to implement the method embodiments described above, and the operations performed by the server, the first roadside unit, and the terminal device in any of the possible implementations of the method embodiments. Illustratively, the communication system has an architecture as shown in fig. 1(a), 1(b) or 1 (c).

Specifically, when the communication method provided by the embodiment of the present application is implemented, the communication system may include a server, a first roadside unit, and a terminal device. In the communication system, the server may be configured to determine a first forwarding rule of the warning information, and send the first forwarding rule to a first road side unit, where the first forwarding rule is used to instruct a terminal device that receives the warning information to send the warning information according to the first forwarding rule. The first road side unit can be used for receiving a first forwarding rule of the early warning information from the server and sending the first forwarding rule of the early warning information. The terminal device may be configured to receive a first forwarding rule of the warning information from the first road side unit, and send the warning information according to the first forwarding rule after receiving the warning information. The first road side unit can be located in the upstream direction of a target area, the upstream direction is the opposite direction of the traffic lane allowing passing direction, the traffic lane is the traffic lane included in the road where the target area is located, and the target area is an area which cannot be warned by the road side unit.

Optionally, the communication system may further include the above second and/or third side unit and may be capable of performing operations performed by the above second and/or third side unit.

Based on the same concept as the method embodiments, an embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, causes the computer to perform the operations performed by the server, the first roadside unit, the second roadside unit, the third roadside unit, or the terminal device in any one of the possible implementations of the method embodiments and the method embodiments.

Based on the same concept as the method embodiments, the present application further provides a computer program product, which when invoked by a computer, can enable the computer to implement the operations performed by the server, the first roadside unit, the second roadside unit, the third roadside unit, or the terminal device in any possible implementation manner of the method embodiments and the method embodiments.

Based on the same concept as the method embodiments described above, the present application also provides a chip or a chip system, which may include a processor. The chip may further include or be coupled with a memory (or a storage module) and/or a transceiver (or a communication module), where the transceiver (or the communication module) may be used to support the chip for wired and/or wireless communication, and the memory (or the storage module) may be used to store a program, and the processor invokes the program to implement the operations performed by the server, the first roadside unit, the second roadside unit, the third roadside unit, or the terminal device in any one of the possible implementations of the method embodiments and the method embodiments described above. The chip system may include the above chip, and may also include the above chip and other discrete devices, such as a memory (or storage module) and/or a transceiver (or communication module).

Embodiments of the present application are described with reference to flowchart illustrations and/or block diagrams of methods, apparatus, and computer program products according to embodiments. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

Claims

1. A method of communication, comprising:

the method comprises the steps that a server determines a first forwarding rule of early warning information, wherein the first forwarding rule is used for indicating a terminal device receiving the early warning information to send the early warning information according to the first forwarding rule;

the server sends the first forwarding rule to a first road side unit;

the first road side unit is located in the upstream direction of a target area, the target area is an area which cannot be subjected to early warning through the road side unit, the upstream direction is the opposite direction of the allowed traffic direction of a lane, and the lane is a lane included in the road where the target area is located.

2. The method of claim 1,

when the road on which the target area is located comprises a first lane and a second lane, and the direction of permitted passage of the first lane is different from the direction of permitted passage of the second lane, the upstream direction comprises the opposite direction of the direction of permitted passage of the first lane, and/or the upstream direction comprises the opposite direction of the direction of permitted passage of the second lane;

when the road on which the target area is located includes a third lane and the road does not include a lane different from a direction of permitted passage of the third lane, the upstream direction includes a direction opposite to the direction of permitted passage of the third lane.

3. The method of claim 1 or 2, wherein the first forwarding rule comprises a first identifier for instructing a terminal device receiving the warning information to forward the warning information.

4. A method according to any of claims 1-3, wherein the first forwarding rule comprises first time information and/or location information;

the first time information is used for indicating the starting time and/or the ending time of the terminal device for forwarding the early warning information;

the position information is used for indicating the starting position and/or the ending position of the terminal device for forwarding the early warning information.

5. The method of claim 4, wherein the first forwarding rule includes the first time information, the method further comprising:

the server determines the first time information according to the coverage area of the first road side unit, the range of the target area and the vehicle speed information, wherein the vehicle speed information is used for indicating the vehicle speed of the vehicle to which the terminal device belongs.

6. The method of claim 4 or 5, wherein the first forwarding rule includes the location information, the method further comprising:

and the server determines the position information according to the coverage area of the first road side unit and the range of the target area.

7. The method of any one of claims 1-6, wherein the target area is within an influence range of an early warning event corresponding to the early warning information, and the target area is not covered by a roadside unit; alternatively, the first and second electrodes may be,

the target area is located in an influence range of an early warning event corresponding to the early warning information, and a second road side unit covering the target area does not meet specific conditions.

8. The method of claim 7, wherein the target area is within an influence range of an early warning event corresponding to the early warning information, and a second road side unit covering the target area does not satisfy a specific condition, wherein the specific condition includes an operating state condition;

the method further comprises the following steps:

the server determines that the second road side unit does not meet the operation state condition according to the operation state information of the second road side unit;

the operation state information of the second road side unit comprises part or all of the following information:

the second road side unit supports the information of the forwarded message type; alternatively, the first and second electrodes may be,

the number of concurrent messages supported by the second roadside unit; alternatively, the first and second electrodes may be,

the current number of concurrent messages of the second road side unit; alternatively, the first and second electrodes may be,

the caching capacity information of the second road side unit; alternatively, the first and second electrodes may be,

and the current cache message number of the second route side unit.

9. The method of claim 7, wherein the target area is within an influence range of an early warning event corresponding to the early warning information, and a second roadside unit covering the target area does not satisfy a specific condition, the specific condition including a network state condition, the method further comprising:

the server determines that the second road side unit does not meet the network state condition according to the network state information of the second road side unit;

the network state information of the second roadside unit comprises part or all of the following information:

information indicating a load status of the short-range communication network of the second roadside unit; alternatively, the first and second electrodes may be,

information indicative of a near field communication network quality of the second roadside unit.

10. The method according to any of claims 1-9, wherein the first forwarding rule comprises a forwarding frequency and/or a forwarding priority.

11. The method of any one of claims 1-10, wherein the method further comprises:

the server sends second time information to the first road side unit, wherein the second time information is used for indicating the starting time and/or the ending time of the first road side unit for sending the first forwarding rule; alternatively, the first and second electrodes may be,

and the server sends a second identifier to the first road side unit, wherein the second identifier is used for indicating the first road side unit to start forwarding the first forwarding rule from the time the first road side unit receives the first forwarding rule.

12. The method of any of claims 1-11, wherein the first roadside unit is a first roadside unit located in the upstream direction of the target area.

13. The method of any one of claims 1-12, wherein the method further comprises:

and the server sends a second forwarding rule of the early warning information to a third route side unit, wherein the second forwarding rule comprises a third identifier, and the third identifier is used for indicating a terminal device receiving the early warning information not to forward the early warning information.

14. The method of claim 13, wherein the method further comprises:

the server sends third time information to the third route side unit, where the third time information is used to indicate a start time and/or an end time of sending the second forwarding rule by the third route side unit; alternatively, the first and second electrodes may be,

and the server sends a fourth identifier to the third route side unit, where the fourth identifier is used to instruct the third route side unit to start sending the second forwarding rule since the third route side unit receives the second forwarding rule.

15. The method of claim 13 or 14, wherein the third wayside unit is located in a downstream direction of a target area, the downstream direction being the lane clear direction.

16. A method of communication, comprising:

a first road side unit receives a first forwarding rule of early warning information from a server, wherein the first forwarding rule is used for indicating a terminal device receiving the early warning information to send the early warning information according to the first forwarding rule;

the first road side unit sends the first forwarding rule;

17. The method of claim 16,

18. The method of claim 16 or 17, wherein the method further comprises:

the first road side unit receives second time information from the server, wherein the second time information is used for indicating the starting time and/or the ending time of the first road side unit for sending the first forwarding rule;

and the first road side unit sends the first forwarding rule according to the second time information.

19. The method of any one of claims 16-18, wherein the method further comprises:

the first road side unit receives a third identification from the server;

and the first road side unit starts to forward the first forwarding rule after receiving the first forwarding rule according to the third identifier.

20. The method according to any of claims 16-19, wherein the first road side unit sending the first forwarding rule comprises:

the first road side unit broadcasts the first forwarding rule; and/or

The first roadside unit sends the first forwarding rule to terminal devices within a coverage area of the first roadside unit.

21. The method of any of claims 16-20, wherein the first roadside unit is a first roadside unit located upstream of the target area.

22. A method of communication, comprising:

the terminal device receives a first forwarding rule of the early warning information from a first road side unit;

after receiving the early warning information, the terminal device sends the early warning information according to the first forwarding rule;

23. The method of claim 1,

24. The method of claim 22 or 23, wherein the first forwarding rule comprises a first identifier for instructing a terminal device receiving the warning information to forward the warning information.

25. The method according to any of claims 22-24, wherein the first forwarding rule comprises first time information and/or location information;

26. A method according to any of claims 22-25, wherein the first forwarding rule comprises a forwarding frequency and/or a forwarding priority.

27. The method of any one of claims 22-26, wherein the method further comprises:

the terminal device receives the warning information from the first roadside unit.

28. The method of any one of claims 22-27, wherein the method further comprises:

the terminal device receives a second forwarding rule of the early warning information from a third route side unit, wherein the second forwarding rule comprises a third identifier, and the third identifier is used for indicating the terminal device receiving the early warning information not to forward the early warning information;

the third route side unit is located in the downstream direction of the target area, and the downstream direction is the traffic lane passing-allowing direction.

29. A communications apparatus, comprising: a communication interface and a processor;

the communication interface is used for the communication device to communicate;

the processor is configured to invoke and execute a program stored in the memory to perform the method of any of claims 1-15.

30. A communications apparatus, comprising: a communication interface and a processor;

the processor is configured to invoke and execute a program stored in the memory to perform the method of any of claims 16-21.

31. A communications apparatus, comprising: a transceiver and a processor;

the transceiver is used for the communication device to communicate;

the processor is configured to invoke and execute a program stored in the memory to perform the method of any of claims 22-28.

32. A communication system comprising a communication apparatus according to claim 29, a communication apparatus according to claim 30 and a communication apparatus according to claim 31.