CN114979986A

CN114979986A - Message transmission method and device

Info

Publication number: CN114979986A
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: 2022-08-30
Anticipated expiration: 2042-05-31
Also published as: CN114979986B

Abstract

The application discloses a message transmission method and a message transmission device, which are used for avoiding the air interface resource of a direct communication interface PC5 of a vehicle-mounted terminal from being occupied for a long time, so that an empty 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 empty port congestion control signaling for starting a direct communication interface PC5 to an Internet of vehicles cloud platform, so that the Internet of vehicles cloud platform issues a PC5 empty port 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 the road side unit RSU.

Description

Message transmission method and device

Technical Field

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

Background

Vehicle To electric communication technology (V2X) is a new generation of information communication technology for connecting vehicles with Everything, and includes two kinds of communication interfaces: one is a short-distance direct communication interface (PC5) 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.

In the current communication mode of the vehicle-mounted terminal PC5, a transmission resource needs to be selected in advance, and a resource selection in a preset resource pool is indicated by transmitting Control Information (Sidelink Control Information, SCI) on a Physical Sidelink Control Channel (PSCCH), so as to avoid resource collision caused by different vehicle-mounted terminals using the same transmission resource, thereby causing message transmission failure. However, in a dense scene of the vehicle-mounted terminals, for example, in the environment of 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 air interface of the PC5, so that Resource Blocks (RBs) in an air interface Resource pool are largely occupied, which causes a Channel Busy Rate (CBR) to be greatly increased, and the vehicle-mounted terminals have to reduce a Channel Occupancy rate (CR) by increasing a message sending period value, thereby reducing the CBR value and ensuring normal communication between vehicles and vehicles, and between vehicles and roads. However, the communication timeliness between vehicles is deteriorated by reducing the message sending frequency, and the problem of secondary accident collision is easily caused, 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 the air interface resource of a direct communication interface PC5 of a vehicle-mounted terminal from being occupied for a long time, so that an empty 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 by the embodiment of the application includes:

when a preset condition is met, reporting an empty port congestion control signaling for starting a direct communication interface PC5 to an Internet of vehicles cloud platform, so that the Internet of vehicles cloud platform issues a PC5 empty port 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 a vehicle periodic message set sent by the Internet of vehicles cloud platform, and broadcasting through PC5 air interface resources of the road side unit RSU.

By the method, the periodic message of the vehicle-mounted terminal equipment is sent through the PC5 air interface resource of the RSU, so that the PC5 air interface resource of the OBU is prevented from being occupied for a long time, and the problem of no resource use caused by the fact that different vehicle-mounted terminals apply for periodic resource surplus is solved, namely the PC5 air interface resource of the OBU is not occupied for a long time by the periodic resource, so that an empty resource pool is used for sending the aperiodic service message, and the resource utilization rate is improved.

In some embodiments, the preset conditions include:

the real-time acquired air interface channel busy rate CBR value of the PC5 of the current vehicle-mounted unit is larger than a preset CBR threshold value;

the current road congestion state value is larger than a preset road congestion state threshold value.

Therefore, dynamic analysis is carried out on the air interface CBR value of the PC5 of the current vehicle-mounted unit obtained in real time based on the road congestion state, whether the air interface congestion control of the PC5 is started or not is judged, and therefore misjudgment caused by the fact that the instantaneous CBR value is increased or the number of vehicles with OBUs is small and the utilization rate of air interface resources is low is avoided.

In some embodiments, the method further comprises:

and for the periodic message of the RSU, carrying out staggered time slot transmission based on the transmission time slot of the vehicle periodic message set.

That is to say, the periodic message of the terminal device is sent in the same time slot through the PC5 air interface resource of the RSU, and the periodic message of the RSU is sent in the wrong time slot, so that the PC5 air interface resource of the RSU is fully utilized, the periodic message of the RSU and the periodic message of the vehicle are sent in the wrong time slot, and the air interface resource is prevented from being completely 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 hotspot of the RSU.

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

In some embodiments, the method further comprises:

when the busy rate CBR value of the PC5 air interface channel of the current vehicle-mounted unit, which is acquired by the RSU in real time, is smaller than the preset CBR threshold value and the current road congestion state value is larger than the preset road congestion state threshold value, reporting a pause PC5 air interface congestion control signaling to a vehicle networking cloud platform, so that the vehicle networking cloud platform issues a PC5 air interface congestion control closing signaling to the vehicle-mounted unit deleted from the vehicle-mounted unit list corresponding to the RSU, and does not issue any signaling about PC5 air interface congestion control to a subsequently newly added vehicle-mounted unit.

In some embodiments, the method further comprises:

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

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 a congestion control signaling for opening an air interface of a PC5 of a direct communication interface sent by a RSU (road side unit), sending a congestion control signaling for opening an air interface of a PC5 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 congestion control signaling of the air interface of the PC 5;

and receiving vehicle periodic messages sent by the vehicle-mounted units in the vehicle-mounted unit list, carrying out aggregation compression on the vehicle periodic messages 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 on-board unit list according to the coordinate position of the on-board unit;

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

and issuing a congestion control signaling for closing an air interface of the PC5 to the vehicle-mounted unit deleted from the vehicle-mounted unit list.

In some embodiments, the method further comprises: and issuing the CBR threshold value and the road congestion state threshold value to a Road Side Unit (RSU), so that the RSU reports a PC5 air interface congestion control signaling when the RSU meets the following conditions:

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

and the current road congestion state value is greater than the road congestion state threshold value.

In some embodiments, the method further comprises:

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

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

In some embodiments, the method further comprises:

when the busy rate CBR value of the PC5 air interface channel of the current vehicle-mounted unit acquired by the 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, receiving a control signaling for closing the PC5 air interface congestion reported by the RSU;

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

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

receiving an empty port congestion control signaling for starting a direct communication interface PC5 sent by a vehicle networking cloud platform;

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:

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

and/or, broadcast vehicle aperiodic messages to the outside through the on-board unit's PC5 air resources.

In some embodiments, the method further comprises:

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

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

Furthermore, according to an embodiment, for example, a computer program product for a computer is provided, which comprises software code portions for performing the steps of the method as 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. Further, the computer program product may be directly loaded into an internal memory of the computer and/or transmitted via a network through at least one of an upload process, a download process, and a push process.

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

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

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 the embodiment of the present application;

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

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

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

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

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

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

fig. 8 is a schematic flowchart 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 apparatus on a network side according to an embodiment of the present application;

fig. 10 is a schematic structural diagram of a message transmission apparatus at a vehicle-mounted terminal side according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

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

The method and the device are based on the same application concept, and because the principles of solving the problems of the method and the device are similar, the implementation of the device and the method can be mutually referred, and repeated parts are not repeated.

The terms "first," "second," and the like in the description and in the claims of the embodiments of the application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced otherwise than as specifically illustrated or 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 understood as merely illustrative examples. Although this specification may refer to "an", "one", or "some" example or embodiment(s) in several places, this does not imply that each such reference relates to the same example or embodiment, nor that the feature only applies to a single example or embodiment. Individual features of different embodiments may also be combined to provide other embodiments. Furthermore, terms such as "comprising" and "comprises" should be understood as not limiting the described embodiments to consist of only those features that have been mentioned; such examples and embodiments may also include features, structures, elements, modules, etc. not specifically mentioned.

The technical scheme provided by the embodiment of the application can be suitable for various systems, especially 5G systems. For example, the applicable System may be a Global System for Mobile communications (GSM) System, a Code Division Multiple Access (CDMA) System, a Wideband Code Division Multiple Access (WCDMA) General Packet Radio Service (General Packet Radio Service, GPRS) System, a Long Term Evolution (Long Term Evolution, LTE) System, a LTE Frequency Division Duplex (FDD) System, a LTE Time Division Duplex (TDD), a Universal Mobile Telecommunications System (UMTS), a Worldwide Interoperability for Microwave Access (WiMAX) System, a 5G NR System, and the like. These various systems include terminal devices and network devices.

The terminal device related to the embodiment of the present application may be a vehicle terminal, a vehicle-mounted terminal, or a device providing voice and/or data connectivity to a user, a handheld device having a wireless connection function, or other processing device connected to a wireless modem. In different systems, the names of the terminal devices may be different, for example, in a 5G system, the terminal device may be called a User Equipment (UE). Wireless terminal devices, which may be mobile terminal devices such as mobile telephones (or "cellular" telephones) and computers with mobile terminal devices, e.g., mobile devices that may be portable, pocket, hand-held, computer-included, or vehicle-mounted, communicate with one or more core networks via the RAN. Examples of such devices include Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, and Personal Digital Assistants (PDAs). The wireless terminal device may also be referred to as a system, a subscriber unit (subscriber unit), a subscriber station (subscriber station), a mobile station (mobile), a remote station (remote station), an access point (access point), a remote terminal device (remote terminal), an access terminal device (access terminal), a user terminal device (user terminal), a user agent (user agent), and a user device (user device), which are not limited in this embodiment of the present application.

The network device according to the embodiment of the present application includes a car networking cloud platform, a drive test unit, a base station, an edge computing unit, and the like, where the base station may include multiple cells, and the base station is, for example, a 5G base station in a 5G network architecture (next generation system), or a Home evolved Node B (HeNB), a relay Node (relay Node), a Home base station (femto), a pico base station (pico), and the like, which is not limited in the embodiment of the present application.

Various embodiments of the present application will be described in detail below with reference to the drawings. It should be noted that the display sequence of the embodiment of the present application only represents the sequence of the embodiment, and does not represent the merits 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 service of the vehicle end is not influenced 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 between vehicles and between roads is guaranteed.

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

high-definition camera: acquiring a current road traffic flow video in real time and providing the current road traffic flow video to an Edge Computing unit (MEC);

an edge calculation unit: analyzing a 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; the road congestion state value includes, for example, a value of a road congestion condition represented by a percentage, and the greater the percentage, the more congested the road is.

On Board Unit (OBU): broadcasting vehicle messages outwards to realize V2V communication; receiving a Road Side traffic information Message (RSI) or a Road Side Safety Message (RSM) broadcasted by a Road Side unit to realize V2I communication; receiving a congestion control signaling sent by a Uu air interface of the Internet of vehicles cloud platform and processing the congestion control signaling according to requirements; wherein a plurality of on-board units, i.e. a plurality of dense on-board units, are included as shown in fig. 1.

Road Side Unit (Road Side Unit, RSU): acquiring a congestion state value and a vehicle-mounted unit air interface CBR value provided by an edge calculation unit in real time, judging whether the congestion state value and the CBR value both reach preset upper limit values, and triggering a PC5 air interface congestion control function;

the car networking cloud platform: the management and control configuration (detailed examples are given later) for the road side unit receives a PC5 air interface congestion control signaling of the road side unit, and issues a congestion control signaling to the vehicle-mounted unit of the specified road section according to the PC5 air interface congestion control signaling;

the probe acquisition system comprises: the Wi-Fi transmission distance 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.

A road side unit:

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

2) the probe acquisition system and the MEC are registered on the RSU equipment after deployment is completed, wherein the MEC reports a road congestion state value to the RSU in real time after registration is successful, and the RSU also acquires a PC5 air interface CBR value of the OBU in real time;

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

serial 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 status value, and PC5 air interface CBR value of OBU

TABLE 1

An on-board unit: based on the V2X service, OBU broadcast content is divided into three types:

1) periodic Message content, such as vehicle Basic Safety Message (BSM), messages such as current vehicle speed, etc.;

2) aperiodic message content such as Vehicle intent And Request messages (VIR);

3) large data volume message content such as vehicle-mounted camera video data captured by a vehicle-mounted camera device;

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

TABLE 2

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

s201, the RSU registers to the Internet of vehicles cloud platform, and reports the ID of the RSU, the longitude and latitude coordinates of the RSU and the air interface radio frequency coverage range of the PC5 of the RSU;

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

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

s204, the vehicle networking cloud platform confirms RSU deployment point location information, screens the OBUs of the networking OBUs within the air interface radio frequency coverage range of the PC5 of the RSU through latitude coordinate values, and adds the OBUs to an OBU list corresponding to the RSU to form an RSU platform data table 2, wherein the contents in the OBU list can be dynamically added or deleted according to the actual position information of the OBU;

s205, accessing a roadside high-definition camera to the MEC, and transmitting a road traffic flow video in real time;

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

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

in the first situation, 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, the air interface congestion control function of the PC5 is started;

that is to say, under the condition that the CBR value is greater than the CBR threshold and the current road congestion state value also exceeds the road congestion state 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, and if the PC5 air interface congestion control function has already been turned on, step S206 is performed, the road congestion state value reported in real time by the MEC 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 performs dynamic analysis based on the road congestion state and the air interface CBR value to determine whether to enable the PC5 air interface congestion control, so as to avoid erroneous determination caused by an increase in the instantaneous CBR value or a low number of OBU-equipped vehicles and a low utilization rate of air interface resources.

Under the condition that the RSU starts a congestion control function, when the RSU acquires that the CBR value of a PC5 air interface resource pool of the OBU is smaller than a CBR threshold value and the current road congestion state value is still larger than the road congestion state threshold value, reporting a pause PC5 air interface congestion control signaling to the Internet of vehicles cloud platform, after receiving the signaling, the Internet of vehicles cloud platform issues a 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 subsequently newly added OBU;

if the conditions 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 are met but the RSU does not start the congestion control function, step S206 is executed, the road congestion state 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 is performed in the same way.

Under the condition that the RSU starts a congestion control function, when the RSU acquires that the CBR value of a PC5 air interface resource pool of the OBU is smaller than a CBR threshold value and the current road congestion state value is smaller than a road congestion state threshold value, closing Wi-Fi hot points of a probe acquisition system and self equipment of the RSU, reporting a PC5 air interface congestion closing control signaling to the Internet of vehicles cloud platform, receiving the signaling, uniformly issuing the PC5 air interface congestion closing control signaling to the OBU list by the Internet of vehicles cloud platform, and not issuing any signaling related to PC5 air interface congestion control to a subsequently added or deleted OBU;

if the conditions 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 but the RSU does not start the congestion control function are met, step S206 is executed, the road congestion state 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 is performed in the same way.

Referring to fig. 3, when an RSU needs to start a congestion control function of an air interface of a PC5, in some embodiments, a congestion control flow of an air interface of a PC5 provided in this application embodiment includes the following steps:

s301, the RSU starts a probe acquisition system according to the IP address list of the probe acquisition system, and starts a Wi-Fi hotspot of equipment of the RSU;

s302, the RSU reports a congestion control signaling for opening an air interface of the PC5 to the Internet of vehicles cloud platform;

s303, after receiving a congestion opening control signaling sent by the RSU, the Internet of vehicles cloud platform appoints an OBU list to the current road section based on a Uu air interface, issues the congestion opening control signaling to the OBUs in the OBU list, dynamically issues the congestion opening control signaling aiming at the OBUs newly added in the list, and issues a congestion closing control signaling aiming at the OBUs which are deleted from the list and drive away from the target point location; wherein, the data field of the congestion control signaling is, for example:

whether or not to start

Message start transmission timestamp

Message sending frequency value

Wi-Fi hotspot and key parameter

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

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

s306, the vehicle networking cloud platform carries out aggregation compression on each vehicle periodic message in the received OBU list to obtain a vehicle periodic message set and sends the vehicle periodic message set to the corresponding RSU;

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

the periodic early warning messages of the RSU are sent in a staggered peak mode based on the sending time slots of the vehicle periodic message set of the OBU, namely the periodic messages of the terminal equipment are sent in the same time slot through the PC5 air interface resources of the RSU, and the periodic messages of the RSU are sent in a staggered time slot mode, so that the PC5 air interface resources of the OBU are prevented from being occupied for a long time, and the problem of no resource utilization caused by the fact that different vehicle-mounted terminals apply for the periodic resource surplus is solved.

S308, judging whether the OBU needs to carry out large-data-volume communication service (such as real-time video resource sharing) or not, and if so, executing the step S309; otherwise, go to step S310;

s309, the OBU searches and connects 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, it may be considered that the Wi-Fi coverage is smaller than the air interface radio frequency coverage of the PC5, and a Mesh networking may be constructed by using the existing roadside probe acquisition system (the Mesh networking is that one router is used as a main router, and other routers are used as sub routers), so that the Wi-Fi coverage is enlarged, the number of Wi-Fi access users is also increased, and the real-time performance and reliability of a large-data-volume communication service are ensured.

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

in some embodiments, in the congestion control procedure, uplink and downlink of the Uu air interface may be based on Ultra Reliable Low Latency Communication (URLLC) network slice transmission to ensure timeliness of signaling issue and vehicle message forwarding, and when an air interface resource pool of the RSU is also in a busy state, a vehicle message set may be forwarded to each device in the OBU list based on the Uu air interface.

In some embodiments, when the large data volume communication service is transmitted, the new characteristics of Wi-Fi6 (sixth generation wireless network technology) such as Multi-User Multiple-Input Multiple-Output (MU-MIMO) and Orthogonal Frequency Division Multiple Access (OFDMA) may be utilized to increase the number of concurrent terminals, and increase the transmission capacity and reduce the delay.

Therefore, in the embodiment of the application, different wireless transmission links are distinguished and used for load balancing according to indexes such as the total message amount (for example, whether a large data volume communication service needs to be performed) of the vehicle-mounted terminal V2X service message, whether periodicity exists, and the like, and wireless resources and access technologies of a Uu air interface, a PC5 air interface and Wi-Fi 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 pool of empty resources of the OBU before and after congestion control using the above congestion control flow is shown in fig. 4a and 4 b. Referring to fig. 4a, air interface resources of the PC5 of the OBU before congestion control are occupied by vehicle periodic messages for a long time, for example, the periodic messages of the vehicle a, the vehicle B, the vehicle C, and the vehicle D; referring to fig. 4b, after congestion control, the air interface resource of the PC5 of the OBU is not occupied by the periodic resource for a long time, and a part of the air interface resource is occupied by the periodic message of the vehicle E or the vehicle F, and a part of the air interface resource is occupied by the aperiodic message of the vehicle F, and in addition, an idle resource block may be used for aperiodic message transmission of the vehicle.

The change of PC5 pool of empty resources of RSU before and after congestion control using the above congestion control flow is shown in fig. 5a and 5 b. Referring to fig. 5a, the air interface resource of the PC5 of the RSU before congestion control is only occupied by its own periodic message, the resource utilization rate is not high, and there are a large number of idle resource blocks. Referring to fig. 5b, after congestion control, the air interface resources of the PC5 of the RSU are fully utilized, and the self periodic message and the vehicle hybrid periodic message (i.e., the vehicle periodic message set described above, i.e., the periodic messages of multiple vehicles) are sent in time slots in error, i.e., alternately sent in different time slots, for example, the vehicle periodic message set may be sent in time slot 1, the RSU periodic message set may be sent in time slot 2, the vehicle periodic message set may be sent in time slot 3, the RSU periodic message … … may be sent in time slot 4, and so on. Therefore, the air interface resources of the PC5 of the RSU are prevented from being completely occupied at the same time, and a resource pool with a proper size can be applied to improve the resource utilization rate according to the data volume of the vehicle mixed periodic message.

In summary, according to the technical scheme provided by the embodiment of the application, in a high-density coverage scene of the terminal device, based on a congestion control scheme of the RSU and a 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 devices in different time slots can be periodically sent in the same time slot, thereby avoiding that the original multiple vehicle-mounted terminal devices fail to send the one-time resource message due to the fact that the periodic messages occupy the periodic resources for a long time, and also preventing resource application imbalance of the different terminal devices and wasting the resource; furthermore, in the embodiment of the application, the large-data-volume message is transmitted by using Wi-Fi frequency band resources, so that the problem of resource conflict during the transmission of the emergency early warning message due to the fact that large data resources occupy large amounts of PC5 air interface time-frequency domain resources is avoided, and potential safety hazards are caused due to the fact that the transmission fails. In addition, a Mesh networking mode based on Wi-Fi can be formed based on the existing roadside probe acquisition system in the embodiment of the application, so that the transmission range is expanded, 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, when a preset condition is met, reporting an empty port congestion control signaling for starting a direct communication interface PC5 to a vehicle networking cloud platform, so that the vehicle networking cloud platform issues a PC5 empty port congestion control signaling to at least one vehicle-mounted unit, and obtains 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:

Namely, when the situation is met, the RSU reports an empty port congestion control signaling for starting the direct communication interface PC5 to the Internet of vehicles cloud platform.

In some embodiments, the method further comprises:

and for the periodic early warning type message of the RSU, carrying out staggered time slot transmission based on the transmission time slot of the vehicle periodic message set.

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

In some embodiments (corresponding to case three), 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 an embodiment of the present application includes:

s701, when receiving a congestion control signaling for opening an air interface of a PC5 of a direct communication interface sent by a RSU (road side unit), sending a congestion control signaling for opening an air interface of a PC5 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 congestion control signaling for the air interface of the PC 5;

s702, receiving the vehicle periodic messages sent by the vehicle-mounted units in the vehicle-mounted unit list, carrying out 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;

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

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

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

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

s801, receiving an empty port congestion control signaling for starting the direct communication interface PC5 sent by the Internet of vehicles cloud platform;

namely, when the situation is met, the OBU receives an empty port congestion control signaling which is sent by the Internet of vehicles cloud platform and used for starting the direct communication interface PC 5;

and S802, 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:

when a large data volume communication service needs to be sent, searching and connecting the Wi-Fi hot spot indicated in the signaling, and transmitting a large data volume communication service message based on a Wi-Fi tunnel; the large data volume communication service is, for example, a communication service whose data volume exceeds a preset threshold, or a preset type of service, etc.;

In some embodiments, the method further comprises:

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

That is, when the above second or third condition is met, the OBU may receive the air interface congestion control signaling of closing the PC5 sent by the car networking cloud platform.

The following describes an apparatus or device provided in the embodiments of the present application, where technical features the same as or corresponding to those described in the above methods are explained or illustrated, and are not further described later.

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 apparatus is used as an RSU-side apparatus, the processor 500, which is used to read the program in the memory 520, executes the following processes:

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

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

When the message transmission device is used as an RSU cloud platform-side device in the car networking, the processor 500 is configured to read the program in the memory 520 and execute the following processes:

when receiving a congestion control signaling for opening an air interface of a direct communication interface PC5 sent by a road side unit RSU, sending an air interface congestion control signaling for opening a PC5 to vehicle-mounted units in a vehicle-mounted unit list corresponding to the RSU, so that the vehicle-mounted units in the vehicle-mounted unit list send PC5 air interface messages according to the received PC5 air interface congestion control signaling;

In some embodiments, the processor 500 is further configured to read a program in the memory 520, and perform the following processes: and issuing the CBR threshold value and the road congestion state threshold value to a Road Side Unit (RSU), so that the RSU reports a PC5 air interface congestion control signaling when the RSU meets the following conditions:

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

Where in fig. 9, the bus architecture may include any number of interconnected buses and bridges, with various circuits being linked together, particularly one or more processors represented by processor 500 and memory represented by memory 520. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 510 may be a number of elements including a transmitter and a receiver that provide 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 (ASIC), a Field Programmable Gate Array (FPGA), or a Complex Programmable Logic Device (CPLD).

Referring to fig. 10, on an on-board terminal side, i.e., an OBU side, a message transmission apparatus provided in an embodiment of the present application includes:

the processor 600, which is used to read the program in the memory 620, executes the following processes:

In some embodiments, the processor 600, further configured to read the program in the memory 620, performs the following processes:

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

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

In some embodiments, a user interface 630 is also included, and the user interface 630 may be an interface capable of interfacing with a desired device, including but not limited to a keypad, a display, a speaker, a microphone, a 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), an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a CPLD (Complex Programmable Logic Device).

The embodiment of the present application provides a computing device, which may specifically be a desktop computer, a portable computer, a smart phone, a tablet computer, a Personal Digital Assistant (PDA), and the like. The computing device may include a Central 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 (LCD), a 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 for storing a program of any one of the methods provided by the embodiments of the present application.

The processor is used for executing any one of the methods provided by the embodiment of the 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 to cause the computer device to perform 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. A readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium include: an electrical connection having one or more wires, a portable disk, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

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

The computer-readable storage medium can be any available media or data storage device that can be accessed by a computer, including but not limited to magnetic memory (e.g., floppy disks, hard disks, magnetic tape, magneto-optical disks (MOs), etc.), optical memory (e.g., CDs, DVDs, BDs, HVDs, etc.), and semiconductor memory (e.g., ROMs, EPROMs, EEPROMs, non-volatile memory (NAND FLASH), Solid State Disks (SSDs)), etc.

It should be understood that:

the access technology via which entities in the communication network communicate traffic to and from 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 later developed programming language, such as a high level programming language, such as objective-C, C, C + +, C #, Java, Python, Javascript, other scripting languages, etc., or a low level programming language, such as 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 mixture thereof, such as a microprocessor or CPU (central processing unit), MOS (metal oxide semiconductor), CMOS (complementary MOS), BiMOS (bipolar MOS), BiCMOS (bipolar CMOS), ECL (emitter coupled logic) and/or TTL (transistor-transistor logic).

Embodiments may be implemented as separate devices, apparatus, units, components or functions or in a distributed manner, e.g., one or more processors or processing functions may be used or shared in a process or one or more processing segments or processing portions may be used and shared in a process, where a 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, FPGA (field programmable gate array) or CPLD (complex programmable logic device) component, or 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.

As will be appreciated by one skilled in the art, 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, 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 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.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

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

2. The method according to claim 1, wherein the preset condition comprises:

3. The method of claim 1, further comprising:

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

5. The method of claim 1, further comprising:

6. The method of claim 1, further comprising:

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

8. The method of claim 7, further comprising:

9. The method of claim 7, further comprising: and issuing the CBR threshold value and the road congestion state threshold value to a Road Side Unit (RSU), so that the RSU reports a PC5 air interface congestion control signaling when the RSU meets the following conditions:

10. The method of claim 7, further comprising:

11. The method of claim 7, further comprising:

when the PC5 air interface channel busy rate CBR value of the current vehicle-mounted unit obtained by the 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, receiving a control signaling for closing the PC5 air interface congestion reported by the RSU;

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

13. The method of claim 12, further comprising:

14. The method of claim 12, further comprising:

15. A message transmission apparatus, comprising:

a memory for storing program instructions;

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

16. A computer program product for a computer, characterized in that it comprises software code portions for performing the method according to any one of claims 1 to 14 when said product is run on the computer.

17. A computer-readable storage medium having stored thereon computer-executable instructions for causing a computer to perform the method of any one of claims 1 to 14.