CN114979986B

CN114979986B - Message transmission method and device

Info

Publication number: CN114979986B
Application number: CN202210607342.4A
Authority: CN
Inventors: 侯剑飞; 李行亮; 杨斌
Original assignee: Zhejiang Dahua Technology Co Ltd
Current assignee: Zhejiang Dahua Technology Co Ltd
Priority date: 2022-05-31
Filing date: 2022-05-31
Publication date: 2024-04-16
Anticipated expiration: 2042-05-31
Also published as: CN114979986A

Abstract

The application discloses a message transmission method and device, which are used for avoiding that the air interface resource of a direct communication interface PC5 of a vehicle-mounted terminal is occupied for a long time, so that a spare resource pool is used for sending aperiodic service messages, and the resource utilization rate is improved. The method provided by the application comprises the following steps: when a preset condition is met, reporting an air interface congestion control signaling of a PC5 of a direct communication interface to an Internet of vehicles cloud platform, enabling the Internet of vehicles cloud platform to send the PC5 air interface congestion control signaling to at least one vehicle-mounted unit, and acquiring a vehicle periodic message sent by the at least one vehicle-mounted unit to obtain a vehicle periodic message set; and receiving the vehicle periodic message set sent by the Internet of vehicles cloud platform, and broadcasting through PC5 air interface resources of a road side unit RSU.

Description

Message transmission method and device

Technical Field

The present disclosure relates to the field of communications technologies, and in particular, to a method and an apparatus for transmitting a message.

Background

The wireless communication technology (Vehicle To Everything, V2X) for vehicles is a new generation of information communication technology for connecting vehicles with everything, and comprises two communication interfaces: one is a short-range direct communication interface (PC 5) between a car, a person (user terminal such as a mobile phone), and a road, and the other is a communication interface (Uu) between a terminal and a base station.

The current vehicle-mounted terminal PC5 needs to pre-select transmission resources in a communication mode, and the control information (Sidelink Control Information, SCI) is transmitted on a physical direct link control channel (Physical Sidelink Control Channel, PSCCH) to indicate the selection of resources in a preset resource pool, so as to avoid resource collision caused by using the same transmission resources by different vehicle-mounted terminals, thereby causing message transmission failure. However, in a dense scene of the vehicle-mounted terminal, such as a traffic accident scene, a holiday high-speed traffic jam and the like, a large number of vehicle-mounted terminals broadcast vehicle safety messages to the PC5 air interface, so that Resource Blocks (RBs) in an air interface Resource pool are occupied in a large amount, the channel busy rate (Channel Busy Ratio, CBR) is greatly improved, the vehicle-mounted terminals have to reduce the channel occupied rate (Channel Occupancy Ratio, CR) by improving the message sending period value, the CBR value is reduced, and the communication between vehicles and roads is ensured to be normal. However, by reducing the message sending frequency, the communication timeliness between vehicles is poor, and the problem of secondary accident collision is easy to occur, so that the occurrence of road congestion is aggravated.

Disclosure of Invention

The embodiment of the application provides a message transmission method and device, which are used for avoiding that the air interface resource of a direct communication interface PC5 of a vehicle-mounted terminal is occupied for a long time, so that a spare resource pool is used for sending aperiodic service messages, and the resource utilization rate is improved.

On the side of a road side unit RSU, a message transmission method provided in the embodiments of the present application includes:

when a preset condition is met, reporting an air interface congestion control signaling of a PC5 of a direct communication interface to an Internet of vehicles cloud platform, enabling the Internet of vehicles cloud platform to send the PC5 air interface congestion control signaling to at least one vehicle-mounted unit, and acquiring a vehicle periodic message sent by the at least one vehicle-mounted unit to obtain a vehicle periodic message set;

and receiving the vehicle periodic message set sent by the Internet of vehicles cloud platform, and broadcasting through the PC5 air interface resource of the road side unit RSU.

According to the method, the periodic information of the vehicle-mounted terminal equipment is sent through the PC5 air interface resource of the RSU, so that the situation that the PC5 air interface resource of the vehicle-mounted unit OBU is occupied for a long time is avoided, the problem that no resource can be used due to the fact that different vehicle-mounted terminals apply for periodic resources in excess is solved, namely, the PC5 air interface resource of the OBU cannot be occupied by the periodic resources for a long time, and a spare resource pool is used for sending non-periodic service information, and the resource utilization rate is improved.

In some embodiments, the preset conditions include:

the method comprises the steps that a PC5 air interface channel busy rate CBR value of a current vehicle-mounted unit obtained in real time is larger than a preset CBR threshold value;

the current road congestion status value is greater than a preset road congestion status threshold.

Therefore, dynamic analysis is carried out on the basis of the road congestion state and the PC5 air interface CBR value of the current vehicle-mounted unit acquired in real time, so that whether the PC5 air interface congestion control is started or not is judged, and misjudgment caused by the fact that the number of the instant CBR values is increased or the number of the vehicles equipped with the OBU is small and the air interface resource utilization rate is low is avoided.

In some embodiments, the method further comprises:

and for periodic messages of the road side unit RSU, carrying out wrong time slot transmission based on the transmission time slots of the periodic message set of the vehicle.

That is, the periodic message of the terminal device is sent through the PC5 air interface resource of the RSU in a synchronous time slot, and the RSU itself is sent in a staggered time slot, so that the PC5 air interface resource of the RSU is fully utilized, the periodic message of itself and the periodic message of the vehicle are sent in a staggered time slot, and the air interface resource is prevented from being fully occupied at the same time.

In some embodiments, before reporting the signaling, the method further comprises:

And starting a probe acquisition system and starting a Wi-Fi hot spot of the road side unit RSU.

According to the method and the device, radio resources and access technologies of Uu air interfaces, PC5 air interfaces and Wi-Fi in different frequency bands are fully utilized, so that V2X communication service can normally operate in a congestion road environment.

In some embodiments, the method further comprises:

when the current PC5 air interface channel busy rate CBR value of the on-board unit acquired by the road side unit RSU in real time is smaller than a preset CBR threshold value and the current road congestion state value is larger than the preset road congestion state threshold value, a suspension PC5 air interface congestion control signaling is reported to the Internet of vehicles cloud platform, so that the Internet of vehicles cloud platform issues a closing PC5 air interface congestion control signaling to the on-board unit deleted in the on-board unit list corresponding to the RSU, and does not issue any signaling related to PC5 air interface congestion control to the subsequently added on-board unit.

In some embodiments, the method further comprises:

when the current PC5 air interface channel busy rate CBR value of the on-board unit acquired by the road side unit RSU in real time is smaller than a preset CBR threshold value and the current road congestion state value is smaller than a preset road congestion state threshold value, reporting a closing PC5 air interface congestion control signaling to the Internet of vehicles cloud platform, so that the Internet of vehicles cloud platform issues the closing PC5 air interface congestion control signaling to the on-board units in the on-board unit list corresponding to the RSU, and does not issue any signaling related to PC5 air interface congestion control to the on-board units which are newly added or deleted subsequently.

Correspondingly, on the cloud platform side of the internet of vehicles, the message transmission method provided by the embodiment of the application comprises the following steps:

when receiving an open direct communication interface PC5 air interface congestion control signaling sent by a road side unit RSU, issuing an open PC5 air interface congestion control signaling to a vehicle-mounted unit in a vehicle-mounted unit list corresponding to the RSU, so that the vehicle-mounted unit in the vehicle-mounted unit list sends a PC5 air interface message according to the received PC5 air interface congestion control signaling;

and receiving the vehicle periodic messages sent by the vehicle-mounted units in the vehicle-mounted unit list, performing aggregation compression to obtain a vehicle periodic message set, and sending the vehicle periodic message set to the RSU.

In some embodiments, the method further comprises:

updating the vehicle-mounted unit list according to the coordinate position of the vehicle-mounted unit;

issuing a PC5 air interface congestion control signaling to a newly added vehicle-mounted unit in the vehicle-mounted unit list;

and issuing and closing the PC5 air interface congestion control signaling aiming at the vehicle-mounted units deleted from the vehicle-mounted unit list.

In some embodiments, the method further comprises: the CBR threshold value and the road congestion state threshold value are issued to a road side unit RSU, so that the RSU reports the PC5 air interface congestion control signaling when the following conditions are met:

The PC5 air interface channel busy rate CBR value of the current vehicle-mounted unit acquired by the RSU in real time is larger than the CBR threshold value;

the current road congestion status value is greater than the road congestion status threshold.

In some embodiments, the method further comprises:

when the current PC5 air interface channel busy rate CBR value of the on-board unit acquired in real time by the RSU is smaller than a preset CBR threshold value and the current road congestion state value is larger than the preset road congestion state threshold value, receiving a pause PC5 air interface congestion control signaling reported by the RSU;

and issuing a control signaling for closing the air interface congestion of the PC5 to the vehicle-mounted unit deleted in the vehicle-mounted unit list corresponding to the RSU, and not issuing any signaling related to the air interface congestion control of the PC5 to the vehicle-mounted unit newly added subsequently.

In some embodiments, the method further comprises:

when the current PC5 air interface channel busy rate CBR value of the on-board unit acquired in real time by the RSU is smaller than a preset CBR threshold value and the current road congestion state value is smaller than a preset road congestion state threshold value, receiving a closed PC5 air interface congestion control signaling reported by the RSU;

and issuing a control signaling for closing the air interface congestion of the PC5 to the vehicle-mounted unit in the vehicle-mounted unit list corresponding to the RSU, and not issuing any signaling related to the air interface congestion control of the PC5 to the vehicle-mounted unit which is newly added or deleted subsequently.

Correspondingly, on the OBU side, the message transmission method provided in the embodiment of the present application includes:

receiving an air interface congestion control signaling of a PC5 (personal computer) for opening a direct communication interface, which is sent by a cloud platform of the Internet of vehicles;

and when the vehicle periodic message needs to be sent, sending the vehicle periodic message to the Internet of vehicles cloud platform according to the signaling.

In some embodiments, the method further comprises:

searching and connecting Wi-Fi hot spots indicated in the signaling when the large-data-volume communication service needs to be sent, and transmitting large-data-volume communication service information based on a Wi-Fi tunnel;

and/or broadcasting the non-periodic message of the vehicle outwards through the PC5 air interface resource of the vehicle-mounted unit.

In some embodiments, the method further comprises:

and receiving an air interface congestion control signaling of the closed PC5 sent by the Internet of vehicles cloud platform.

Another embodiment of the present application provides a message transmission apparatus, which includes a memory for storing program instructions and a processor for calling the program instructions stored in the memory and executing any one of the methods according to the obtained program.

Furthermore, according to an embodiment, for example, a computer program product for a computer is provided, comprising software code portions for performing the steps of the method defined above, when said product is run on a computer. The computer program product may include a computer-readable medium having software code portions stored thereon. Furthermore, the computer program product may be directly loaded into the internal memory of the computer and/or transmitted via the network by at least one of an upload procedure, a download procedure and a push procedure.

Another embodiment of the present application provides a computer-readable storage medium storing computer-executable instructions for causing a computer to perform any of the methods described above.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of a system architecture provided in an embodiment of the present application;

fig. 2 is a schematic diagram of a system message transmission flow provided in an embodiment of the present application;

fig. 3 is a schematic diagram of a PC5 air interface congestion control flow provided in an embodiment of the present application;

fig. 4a is a schematic diagram of a PC5 air interface resource pool change of an OBU before PC5 air interface congestion control according to an embodiment of the present application;

fig. 4b is a schematic diagram of a change of a PC5 air interface resource pool of an OBU after PC5 air interface congestion control according to an embodiment of the present application;

fig. 5a is a schematic diagram of a change of a PC5 air interface resource pool of an RSU before PC5 air interface congestion control according to an embodiment of the present application;

Fig. 5b is a schematic diagram of a change of a PC5 air interface resource pool of an RSU after PC5 air interface congestion control according to an embodiment of the present application;

fig. 6 is a flow chart of a message transmission method on the RSU side according to an embodiment of the present application;

fig. 7 is a flow chart of a message transmission method on the cloud platform side of the internet of vehicles according to the embodiment of the present application;

fig. 8 is a flow chart of a message transmission method on an OBU side according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of a message transmission device on a network side according to an embodiment of the present application;

fig. 10 is a schematic structural diagram of a message transmission device on a vehicle terminal side according to an embodiment of the present application.

Detailed Description

The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

The method and the device are based on the same application, and because the principles of solving the problems by the method and the device are similar, the implementation of the device and the method can be referred to each other, and the repetition is not repeated.

The terms first, second and the like in the description and in the claims of the embodiments and in the above-described figures, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments described herein may be implemented in other sequences than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The following examples and embodiments are to be construed as illustrative only. Although the specification may refer to "an", "one", or "some" example or embodiment(s) at several points, this does not mean that each such reference is related to the same example or embodiment, nor that the feature is applicable to only a single example or embodiment. Individual features of different embodiments may also be combined to provide further embodiments. Furthermore, terms such as "comprising" and "including" should be understood not to limit the described embodiments to consist of only those features already mentioned; such examples and embodiments may also include features, structures, units, modules, etc. that are not specifically mentioned.

The technical scheme provided by the embodiment of the application can be suitable for various systems, in particular to a 5G system. For example, suitable systems may be global system for mobile communications (Global System of Mobile communication, GSM), code division multiple access (Code Division Multiple Access, CDMA), wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA) universal packet radio service (General Packet Radio Service, GPRS), long term evolution (Long Term Evolution, LTE), LTE frequency division duplex (Frequency Division Duplex, FDD), LTE time division duplex (Time Division Duplex, TDD), universal mobile system (Universal Mobile Telecommunication System, UMTS), worldwide interoperability for microwave access (Worldwide interoperability for Microwave Access, wiMAX), 5G NR, and the like. Terminal devices and network devices are included in these various systems.

The terminal device according to the embodiments of the present application may be a vehicle terminal, a vehicle-mounted terminal, or a device that provides voice and/or data connectivity to a user, a handheld device with a wireless connection function, or other processing devices connected to a wireless modem. The names of the terminal devices may also be different in different systems, for example in a 5G system, the terminal devices may be referred to as User Equipment (UE). The wireless terminal device may communicate with one or more core networks via the RAN, and may be mobile terminal devices such as mobile phones (or "cellular" phones) and computers with mobile terminal devices, e.g., portable, pocket, hand-held, computer-built-in, or vehicle-mounted mobile devices that exchange voice and/or data with the radio access network. Such as personal communication services (Personal Communication Service, PCS) phones, cordless phones, session initiation protocol (Session Initiated Protocol, SIP) phones, wireless local loop (Wireless Local Loop, WLL) stations, personal digital assistants (Personal Digital Assistant, PDAs), and the like. The wireless terminal device may also be referred to as a system, subscriber unit (subscriber unit), subscriber station (subscriber station), mobile station (mobile), remote station (remote station), access point (access point), remote terminal device (remote terminal), access terminal device (access terminal), user terminal device (user terminal), user agent (user agent), user equipment (user device), and the embodiments of the present application are not limited.

The network device that this application embodiment relates to, including car networking cloud platform, drive test unit, basic station, edge calculation unit etc. the basic station can include a plurality of district, the basic station is 5G basic station in 5G network architecture (next generation system) for example, also can be family evolution basic station (Home evolved Node B, heNB), relay node (relay node), home base station (femto), pico base station (pico) etc. the embodiment of the application is not limited.

Various embodiments of the present application are described in detail below with reference to the drawings attached hereto. It should be noted that, the display sequence of the embodiments of the present application only represents the sequence of the embodiments, and does not represent the advantages or disadvantages of the technical solutions provided by the embodiments.

According to the technical scheme provided by the embodiment of the application, under the condition that the traffic of the vehicle terminal is not affected in the high-density coverage scene of the vehicle-mounted terminal, the congestion condition of the resource pool can be effectively reduced, and the normal communication among vehicles and between vehicles and roads is ensured.

In some embodiments, referring to fig. 1, a system for improving V2X communication reliability provided in an embodiment of the present application includes:

high definition camera: collecting current road traffic videos in real time and providing the current road traffic videos to an edge computing unit (Mobile Edge Computing, MEC);

Edge calculation unit: analyzing the traffic flow video in real time through an algorithm (the existing algorithm), generating a current road congestion state value, and providing the current road congestion state value to a road side unit; wherein the road congestion status value, for example, includes a value of road congestion in terms of a percentage, the greater the percentage, the more congested the road.

On Board Unit (OBU): broadcasting vehicle information outwards to realize V2V communication; receiving a road side traffic information message (Road Side Info Message, RSI) or a road side safety message (Road Side Safety Message, RSM) broadcasted by a road side unit, and implementing V2I communication; receiving congestion control signaling issued by a Uu air interface of the cloud platform of the Internet of vehicles and processing the congestion control signaling according to requirements; wherein the illustration in fig. 1 comprises a plurality of on-board units, i.e. a multi-dense on-board unit.

Road Side Unit (RSU): acquiring a congestion state value and a CBR value of an air interface of a vehicle-mounted unit provided by an edge computing unit in real time, judging whether the congestion state value and the CBR value reach a preset upper limit value or not, and triggering a PC5 air interface congestion control function;

internet of vehicles cloud platform: the control configuration (detailed illustration is provided later) is used for the road side unit, receiving the PC5 air interface congestion control signaling of the road side unit, and transmitting the congestion control signaling to the vehicle-mounted unit of the appointed road section according to the PC5 air interface congestion control signaling;

Probe acquisition system: the Wi-Fi transmission distance is used for expanding the road side unit;

regarding the system configuration:

PC5 air interface resource pool: in the current use scene, the sending resources of the RSU and the OBU adopt a double-resource-pool independent allocation mode, the sending frequency bands of the RSU and the OBU do not conflict with each other, and the receiving resource pool adopts a sharing mode.

Road side unit:

1) Registering the RSU with the Internet of vehicles cloud platform through a Uu air interface of the 5G communication module after the RSU deployment is completed, reporting equipment deployment longitude and latitude coordinates and a self PC5 air interface radio frequency coverage value, and issuing a road congestion state threshold and a CBR threshold by the Internet of vehicles cloud platform;

2) Registering the probe acquisition system and the MEC on RSU equipment after the deployment is completed, reporting a road congestion state value to the RSU in real time after the MEC is successfully registered, and acquiring a PC5 air interface CBR value of the OBU by the RSU in real time;

the following example configuration table 1 is formed at the RSU:

sequence number	Recording content
		1	Threshold value of road congestion state
2	CBR threshold value
		3	Probe acquisition system IP address list
4	Real-time road congestion state value and PC5 air interface CBR value of OBU

TABLE 1

And (3) a vehicle-mounted unit: based on V2X services, OBU broadcast content is divided into three categories:

1) Periodic message content, such as a vehicle basic safety message (Basic Safety Message, BSM), such as a message of the current vehicle speed;

2) Aperiodic message content, such as vehicle intention and request messages (Vehicle Intention And Request, VIR);

3) Large data amount message content, such as vehicle-mounted image capturing video data captured by a vehicle-mounted image capturing device;

internet of vehicles cloud platform: confirming RSU deployment point location information, screening OBUs with longitude and latitude coordinate values in a PC5 air interface radio frequency coverage range of the RSU in the networking OBU, adding the OBUs to an OBU list corresponding to the RSU, and forming the following example RSU data table 2 on the Internet of vehicles cloud platform:

TABLE 2

Referring to fig. 2, in some embodiments, a service processing flow of a system provided in an embodiment of the present application includes:

s201, registering the RSU to the Internet of vehicles cloud platform, and reporting the ID of the RSU, longitude and latitude coordinates of the RSU and a PC5 air interface radio frequency coverage area of the RSU;

s202, a vehicle networking cloud platform issues a road congestion state threshold value and a CBR threshold value;

s203, registering the probe acquisition system and the MEC after deployment is completed, and generating a configuration table in the RSU, wherein the configuration table comprises parameter information shown in a table 1;

s204, the cloud platform of the internet of vehicles confirms the information of the deployment point position of the RSU, screens the OBU of which the longitude and latitude coordinate value is in the radio frequency coverage range of the PC5 air interface of the RSU in the networked OBU, adds the OBU to an OBU list corresponding to the RSU to form an RSU platform data table 2, and dynamically adds or deletes the content in the OBU list according to the information of the actual position of the OBU;

S205, a road side high definition camera is connected to the MEC, and road traffic flow videos are transmitted in real time;

s206, MEC provides real-time calculation force analysis for the traffic flow video, and reports the road congestion state value obtained after analysis to the RSU; the RSU acquires the PC5 air interface CBR value of the current OBU in real time through a V2X module (prior art);

s207, the RSU compares the road congestion state value with a road congestion state threshold value, compares the CBR value with a CBR threshold value, and performs one of the following three cases according to the comparison result:

in the first case, when the CBR value is larger than the CBR threshold value and the current road congestion state value also exceeds the road congestion state threshold value, starting the PC5 air interface congestion control function;

that is, under the condition that the CBR value is greater than the CBR threshold and the current road congestion status value also exceeds the road congestion status threshold, if the RSU does not turn on the PC5 air interface congestion control function, the PC5 air interface congestion control function is turned on, if the PC5 air interface congestion control function is already turned on, step S206 is executed, the road congestion status value reported by the MEC in real time and the PC5 air interface CBR value of the current OBU are continuously obtained, and the subsequent comparison processing procedure is performed in the same manner.

Therefore, in the embodiment of the application, the RSU dynamically analyzes the road congestion state and the air interface CBR value to judge whether to start the PC5 air interface congestion control, so that misjudgment caused by the fact that the instantaneous CBR value is increased or the number of vehicles equipped with the OBU is small and the air interface resource utilization rate is low is avoided.

Under the condition that the RSU starts the congestion control function, when the RSU acquires that the CBR value of the PC5 air interface resource pool of the OBU is smaller than the CBR threshold value and the current road congestion state value is larger than the road congestion state threshold value, reporting a pause PC5 air interface congestion control signaling to the Internet of vehicles cloud platform, and after receiving the signaling, the Internet of vehicles cloud platform issues a closed PC5 air interface congestion control signaling for the deleted OBU and does not issue any signaling related to PC5 air interface congestion control for the subsequent newly-added OBU;

if the condition that the CBR value of the PC5 air interface resource pool of the current OBU is smaller than the CBR threshold value and the current road congestion state value is larger than the road congestion state threshold value is met, but the RSU does not start the congestion control function, executing step S206, continuously acquiring the road congestion state value reported by the MEC in real time and the PC5 air interface CBR value of the current OBU, and similarly carrying out the subsequent comparison processing process.

Under the condition that the RSU starts the congestion control function, when the RSU acquires that the CBR value of the PC5 air interface resource pool of the OBU is smaller than the CBR threshold value and the current road congestion state value is smaller than the road congestion state threshold value, a probe acquisition system and Wi-Fi hot spots of RSU self equipment are closed, a PC5 air interface congestion control signaling is reported to a vehicle networking cloud platform, the vehicle networking cloud platform uniformly issues the PC5 air interface congestion control signaling to the OBU list after receiving the signaling, and any signaling related to PC5 air interface congestion control is not issued to the next newly added or deleted OBU;

If the condition that the CBR value of the PC5 air interface resource pool of the current OBU is smaller than the CBR threshold value and the current road congestion state value is smaller than the road congestion state threshold value is met, but the RSU does not start the congestion control function, executing step S206, continuously acquiring the road congestion state value reported by the MEC in real time and the PC5 air interface CBR value of the current OBU, and similarly carrying out the subsequent comparison processing process.

When the RSU needs to turn on the congestion control function of the PC5 air interface, referring to fig. 3, in some embodiments, the congestion control flow of the PC5 air interface provided in the embodiments of the present application includes the following steps:

s301, starting a probe acquisition system by the RSU according to an IP address list of the probe acquisition system, and starting Wi-Fi hot spots of the RSU self equipment;

s302, reporting an open PC5 air interface congestion control signaling to the Internet of vehicles cloud platform by the RSU;

s303, after receiving the congestion control starting signaling sent by the RSU, the cloud platform of the Internet of vehicles assigns an OBU list to the current road section based on a Uu air interface, issues the congestion control starting signaling to the OBU in the OBU list, dynamically issues the congestion control starting signaling to the newly added OBU in the list, and issues the congestion control closing signaling to the OBU which is deleted from the list and leaves the target point; wherein the data fields of the congestion control signaling are for example:

Whether or not to enable

Message start send timestamp

Message transmission frequency value

Wi-Fi hotspot and key parameters

S304, after the OBU of the vehicle receives congestion control signaling sent by the cloud platform of the Internet of vehicles, judging whether the OBU needs to send periodic information of the vehicle, and if so, executing step S305; otherwise, step S308 is performed;

s305, the OBU of the vehicle starts to send a time stamp and a message sending frequency value according to the message appointed in the congestion control signaling, and pushes the vehicle periodic message to the Internet of vehicles cloud platform through a Uu air interface;

s306, the vehicle networking cloud platform aggregates and compresses each vehicle periodic message in the received OBU list to obtain a vehicle periodic message set and sends the vehicle periodic message set to a corresponding RSU;

s307, the RSU broadcasts the periodic message set of the vehicle to all OBUs of the current road section by selecting PC5 air interface resources with proper RSU size;

for the periodic early warning message of the RSU, peak shifting transmission is performed based on the transmission time slot of the vehicle periodic message set of the OBU, namely, the periodic message of the terminal equipment is transmitted through the PC5 air interface resource of the RSU in a time slot mode, and the periodic message of the RSU is transmitted in a time slot mode, so that the PC5 air interface resource of the OBU is prevented from being occupied for a long time, and the problem of resource-free utilization caused by the fact that periodic resources are excessively applied for by different vehicle-mounted terminals is solved.

S308, judging whether the OBU needs to perform large data volume communication service (such as real-time video resource sharing and the like), if so, executing a step S309; otherwise, step S310 is performed;

s309, the OBU searches and connects with Wi-Fi hotspots in the congestion control signaling to transmit the large data volume communication service message based on the Wi-Fi tunnel.

In some embodiments, the Wi-Fi coverage area is considered to be smaller than the PC5 air interface radio frequency coverage area, and Mesh networking (Mesh networking is that one router is a main router and other routers are sub routers) can be constructed through the existing road side probe acquisition system, so that the Wi-Fi coverage area is enlarged, the number of Wi-Fi access users is increased, and the real-time performance and reliability of large-data-volume communication services are ensured.

S310, the OBU broadcasts an aperiodic message outwards through a PC5 air interface resource of the OBU;

in some embodiments, in the congestion control flow, the Uu air interface uplink and downlink may be based on the timeliness of the ultra-reliable low latency transmission (Ultra Reliable Low Latency Communication, URLLC) network slice transmission guarantee signaling delivery and vehicle message forwarding, and in addition, when the air interface resource pool of the RSU is also in a busy state, the vehicle message set may be forwarded to each device in the OBU list based on the Uu air interface.

In some embodiments, when transmitting the above-mentioned large data volume communication service, new characteristics of Wi-Fi6 (sixth generation wireless network technology) may be utilized, such as Multi-User Multiple-Input Multiple-Output (MU-MIMO) and orthogonal frequency division Multiple access (Orthogonal Frequency Division Multiple Access, OFDMA), so that the number of terminal concurrency is increased, and at the same time, the transmission capacity is increased, and the delay is reduced.

In the embodiment of the application, different wireless transmission links are used for load balancing according to indexes such as total message amount (e.g. whether large data volume communication service is needed) of the vehicle-mounted terminal V2X service message, periodicity and the like, and wireless resources and access technologies of Uu air interfaces, PC5 air interfaces and Wi-Fi in different frequency bands are fully utilized, so that the V2X communication service can normally operate in a congested road environment.

The change of the PC5 air interface resource pool of the OBU before and after congestion control by using the above-mentioned congestion control procedure is shown in fig. 4a and 4 b. Referring to fig. 4a, the PC5 air interface resources of the OBU before congestion control are occupied for a long time by periodic messages of the vehicle, for example by periodic messages of vehicle a, vehicle B, vehicle C, vehicle D; referring to fig. 4b, the PC5 air interface resources of the OBU after congestion control are not occupied by periodic resources for a long time, some are occupied by periodic messages of the vehicle E and the vehicle F, some are occupied by non-periodic messages of the vehicle F, and in addition, there may be free resource blocks for non-periodic message transmission of the vehicle.

The change of the PC5 air interface resource pool of RSUs before and after congestion control by using the above-mentioned congestion control procedure is shown in fig. 5a and 5 b. Referring to fig. 5a, the PC5 air interface resource of the RSU before congestion control is occupied only by its own periodic message, the resource utilization is not high, and there are a large number of idle resource blocks. Referring to fig. 5b, the PC5 air interface resource of the RSU after congestion control is fully utilized, and the own periodic message and the vehicle mixed periodic message (i.e. the above-mentioned vehicle periodic message set, i.e. the periodic messages of a plurality of vehicles) are sent in wrong time slots, i.e. alternatively sent in different time slots, for example, the vehicle periodic message set may be sent in time slot 1, the RSU periodic message is sent in time slot 2, the vehicle periodic message set is sent in time slot 3, the RSU periodic message … … is sent in time slot 4, and so on. Therefore, the situation that the PC5 air interface resources of the RSU are completely occupied at the same moment is avoided, and the resource utilization rate can be improved by applying for a resource pool with a proper size according to the data size of the vehicle mixed periodic message.

In summary, in the technical scheme provided by the embodiment of the application, under the high-density coverage scene of the terminal equipment, based on the congestion control scheme of the RSU and the cloud (Internet of vehicles cloud platform), idle PC5 air interface resources of the RSU are fully utilized, so that periodic messages sent by different terminal equipment in different time slots can be periodically sent in the same time slot, the problem that the original multiple vehicle-mounted terminal equipment occupy the periodic resources for a long time to cause failure in sending disposable resource messages is avoided, and the problem that the resource application of the different terminal equipment is unbalanced to cause resource use waste is also prevented; further, in the embodiment of the application, wi-Fi frequency band resources are utilized to transmit large data volume information, so that the problem of resource conflict when emergency early warning information is transmitted due to the fact that the large data volume resources occupy a large amount of PC5 air interface time-frequency domain resources is avoided, and potential safety hazards are caused by transmission failure. In addition, the Mesh networking mode based on Wi-Fi can be formed based on the existing road side probe acquisition system, so that the transmission range is enlarged, and the interaction reliability and timeliness of the message service are further guaranteed.

Referring to fig. 6, on the RSU side, a message transmission method provided in the embodiment of the present application includes:

s601, reporting an air interface congestion control signaling of a PC5 of a direct communication interface to a cloud platform of the Internet of vehicles when a preset condition is met, enabling the cloud platform of the Internet of vehicles to issue the air interface congestion control signaling of the PC5 to at least one vehicle-mounted unit, and acquiring a vehicle periodic message sent by the at least one vehicle-mounted unit to obtain a vehicle periodic message set;

s602, receiving a vehicle periodic message set sent by the Internet of vehicles cloud platform, and broadcasting through PC5 air interface resources of a road side unit RSU.

In some embodiments, the preset conditions include:

When the situation is met, the RSU reports and opens the direct communication interface PC5 air interface congestion control signaling to the Internet of vehicles cloud platform.

In some embodiments, the method further comprises:

and for the periodic early warning message of the road side unit RSU, carrying out wrong time slot transmission based on the transmission time slot of the periodic message set of the vehicle.

In some embodiments (corresponding to the second case), the method further comprises:

In some embodiments (corresponding to the third case), the method further comprises:

Correspondingly, referring to fig. 7, on the cloud platform side of the internet of vehicles, a message transmission method provided in the embodiment of the application includes:

s701, when receiving an open direct communication interface PC5 air interface congestion control signaling sent by a road side unit RSU, issuing the open PC5 air interface congestion control signaling to a vehicle-mounted unit in a vehicle-mounted unit list corresponding to the RSU, so that the vehicle-mounted unit in the vehicle-mounted unit list sends a PC5 air interface message according to the received PC5 air interface congestion control signaling;

s702, receiving the vehicle periodic messages sent by the vehicle-mounted units in the vehicle-mounted unit list, performing aggregation compression, obtaining a vehicle periodic message set, and sending the vehicle periodic message set to the RSU.

In some embodiments, the method further comprises:

Accordingly, referring to fig. 8, on the vehicle unit side, a message transmission method provided in the embodiment of the present application includes:

s801, receiving an air interface congestion control signaling of a PC5 (personal computer) which is sent by a cloud platform of the Internet of vehicles and is used for opening a direct communication interface;

when the situation is met, the OBU receives an air interface congestion control signaling of a PC5 which is used for opening a direct communication interface and sent by the cloud platform of the Internet of vehicles;

s802, when the vehicle periodic message needs to be sent, the vehicle periodic message is sent to the Internet of vehicles cloud platform according to the signaling.

In some embodiments, the method further comprises:

searching and connecting Wi-Fi hot spots indicated in the signaling when the large-data-volume communication service needs to be sent, and transmitting large-data-volume communication service information based on a Wi-Fi tunnel; wherein, the large data volume communication service is, for example, a communication service with data volume exceeding a preset threshold, or a preset type service, etc.;

In some embodiments, the method further comprises:

And when the second or third condition is met, the OBU receives the air interface congestion control signaling of the closed PC5 sent by the Internet of vehicles cloud platform.

The following describes a device or apparatus provided in the embodiments of the present application, where explanation or illustration of the same or corresponding technical features as those described in the above method is omitted herein.

Referring to fig. 9, a message transmission apparatus provided in an embodiment of the present application includes: a processor 500 and a memory 520;

when the message transmission device is an RSU-side device, the processor 500 is configured to read the program in the memory 520, and execute the following procedure:

In some embodiments, the processor 500 is further configured to read the program in the memory 520, and perform the following:

In some embodiments, before reporting the signaling, the processor 500 is further configured to read the program in the memory 520, and perform the following procedure:

When the message transmission device is used as an RSU internet of vehicles cloud platform side device, the processor 500 is configured to read the program in the memory 520, and execute the following procedures:

In some embodiments, the processor 500 is further configured to read the program in the memory 520, and perform the following: the CBR threshold value and the road congestion state threshold value are issued to a road side unit RSU, so that the RSU reports the PC5 air interface congestion control signaling when the following conditions are met:

In some embodiments, the apparatus further comprises a transceiver 510 for receiving and transmitting data under the control of the processor 500.

Wherein in fig. 9, a bus architecture may comprise any number of interconnected buses and bridges, and in particular one or more processors represented by processor 500 and various circuits of memory represented by memory 520, linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., which are well known in the art and, therefore, will not be described further herein. The bus interface provides an interface. The transceiver 510 may be a number of elements, i.e., including a transmitter and a receiver, providing a means for communicating with various other apparatus over a transmission medium. The processor 500 is responsible for managing the bus architecture and general processing, and the memory 520 may store data used by the processor 500 in performing operations.

The processor 500 may be a Central Processing Unit (CPU), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), a Field programmable gate array (Field-Programmable Gate Array, FPGA), or a complex programmable logic device (Complex Programmable Logic Device, CPLD).

Referring to fig. 10, on a vehicle terminal side, that is, an OBU side, a message transmission device provided in this embodiment of the present application includes:

the processor 600, configured to read the program in the memory 620, performs the following procedures:

In some embodiments, the processor 600 is further configured to read the program in the memory 620, and perform the following procedure:

In some embodiments, the apparatus further comprises a transceiver 610 for receiving and transmitting data under the control of the processor 600.

Wherein in fig. 10, a bus architecture may comprise any number of interconnected buses and bridges, and in particular one or more processors represented by the processor 600 and various circuits of the memory represented by the memory 620, linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., which are well known in the art and, therefore, will not be described further herein. The bus interface provides an interface. Transceiver 610 may be a number of elements, including a transmitter and a receiver, providing a means for communicating with various other apparatus over a transmission medium.

In some embodiments, further comprising a user interface 630, the user interface 630 may be an interface capable of interfacing with an inscribed desired device, including but not limited to a keypad, display, speaker, microphone, joystick, etc.

The processor 600 is responsible for managing the bus architecture and general processing, and the memory 620 may store data used by the processor 600 in performing operations.

In some embodiments, the processor 600 may be a CPU (Central processing Unit), ASIC (Application Specific Integrated Circuit ), FPGA (Field-Programmable Gate Array, field programmable Gate array), or CPLD (Complex Programmable Logic Device ).

Embodiments of the present application provide a computing device, which may be specifically a desktop computer, a portable computer, a smart phone, a tablet computer, a personal digital assistant (Personal Digital Assistant, PDA), and the like. The computing device may include a central processing unit (Center Processing Unit, CPU), memory, input/output devices, etc., the input devices may include a keyboard, mouse, touch screen, etc., and the output devices may include a display device, such as a liquid crystal display (Liquid Crystal Display, LCD), cathode Ray Tube (CRT), etc.

The memory may include Read Only Memory (ROM) and Random Access Memory (RAM) and provides the processor with program instructions and data stored in the memory. In the embodiments of the present application, the memory may be used to store a program of any of the methods provided in the embodiments of the present application.

The processor is configured to execute any of the methods provided in the embodiments of the present application according to the obtained program instructions by calling the program instructions stored in the memory.

Embodiments of the present application also provide a computer program product or computer program comprising computer instructions stored in a computer-readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device performs the method of any of the above embodiments. The program product may employ any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. The readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium would include the following: an electrical connection having one or more wires, a portable disk, a hard disk, random Access Memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

The present embodiments provide a computer readable storage medium for storing computer program instructions for use with an apparatus provided in the embodiments of the present application described above, which includes a program for executing any one of the methods provided in the embodiments of the present application described above. The computer readable storage medium may be a non-transitory computer readable medium.

The computer-readable storage medium can be any available medium or data storage device that can be accessed by a computer, including, but not limited to, magnetic storage (e.g., floppy disks, hard disks, magnetic tape, magneto-optical disks (MOs), etc.), optical storage (e.g., CD, DVD, BD, HVD, etc.), and semiconductor storage (e.g., ROM, EPROM, EEPROM, nonvolatile storage (NAND FLASH), solid State Disk (SSD)), etc.

It should be understood that:

the access technology via which an entity in the communication network communicates traffic may be any suitable current or future technology, such as WLAN (wireless local access network), wiMAX (worldwide interoperability for microwave access), LTE-a, 5G, bluetooth, infrared, etc. may be used; in addition, embodiments may also apply wired technologies, e.g., IP-based access technologies, such as wired networks or fixed lines.

Embodiments suitable for implementation as software code or portions thereof and for execution using a processor or processing function are software code independent and may be specified using any known or future developed programming language, such as a high-level programming language, such as an objective-C, C, C ++, c#, java, python, javascript, other scripting languages, etc., or a low-level programming language, such as a machine language or assembler.

The implementation of the embodiments is hardware-independent and may be implemented using any known or future developed hardware technology or any hybrid thereof, such as microprocessors or CPUs (central processing units), MOS (metal oxide semiconductors), CMOS (complementary MOS), biMOS (bipolar MOS), biCMOS (bipolar CMOS), ECL (emitter coupled logic), and/or TTL (transistor-transistor logic).

Embodiments may be implemented as a single device, apparatus, unit, component, or function, or in a distributed fashion, e.g., one or more processors or processing functions may be used or shared in a process, or one or more processing segments or portions may be used and shared in a process where one physical processor or more than one physical processor may be used to implement one or more processing portions dedicated to a particular process as described.

The apparatus may be implemented by a semiconductor chip, a chipset, or a (hardware) module comprising such a chip or chipset.

Embodiments may also be implemented as any combination of hardware and software, such as an ASIC (application specific IC (integrated circuit)) component, an FPGA (field programmable gate array) or CPLD (complex programmable logic device) component, or a DSP (digital signal processor) component.

Embodiments may also be implemented as a computer program product comprising a computer usable medium having a computer readable program code embodied therein, the computer readable program code adapted to perform a process as described in the embodiments, wherein the computer usable medium may be a non-transitory medium.

It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, magnetic disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.

Claims

1. A method of message transmission, the method comprising:

2. The method of claim 1, wherein the preset conditions include:

3. The method according to claim 1, wherein the method further comprises:

4. The method of claim 1, wherein prior to reporting the signaling, the method further comprises:

5. The method according to claim 1, wherein the method further comprises:

6. The method according to claim 1, wherein the method further comprises:

7. A method of message transmission, the method comprising:

and receiving the vehicle periodic messages sent by the vehicle-mounted units in the vehicle-mounted unit list, performing aggregation compression to obtain a vehicle periodic message set, and sending the vehicle periodic message set to the RSU, so that the RSU receives the vehicle periodic message set, and broadcasting the vehicle periodic message set through a PC5 air interface resource of the RSU.

8. The method of claim 7, wherein the method further comprises:

9. The method of claim 7, wherein the method further comprises: the CBR threshold value and the road congestion state threshold value are issued to a road side unit RSU, so that the RSU reports the PC5 air interface congestion control signaling when the following conditions are met:

10. The method of claim 7, wherein the method further comprises:

11. The method of claim 7, wherein the method further comprises:

12. A method of message transmission, the method comprising:

when the vehicle periodic message needs to be sent, the local vehicle-mounted unit sends the vehicle periodic message to the vehicle networking cloud platform according to the signaling, so that the vehicle networking cloud platform obtains the vehicle periodic message sent by at least one vehicle-mounted unit and performs aggregation and compression to obtain a vehicle periodic message set and sends the vehicle periodic message set to a road side unit RSU, and further the RSU receives the vehicle periodic message set and broadcasts the vehicle periodic message set through a PC5 air interface resource of the RSU.

13. The method according to claim 12, wherein the method further comprises:

14. The method according to claim 12, wherein the method further comprises:

15. A message transmission apparatus, comprising:

a memory for storing program instructions;

a processor for invoking program instructions stored in the memory to perform the method of any of claims 1 to 14 in accordance with the obtained program.

16. A computer-readable storage medium storing computer-executable instructions for causing a computer to perform the method of any one of claims 1 to 14.