WO2021143406A1 - Message transmitting method, message receiving method, device, and apparatus - Google Patents

Abstract

Disclosed are a message transmitting method, a message receiving method, a device, and an apparatus applicable to an Internet of Vehicles. The message transmitting method comprises: a road side unit (RSU) determining, within a first time period, an average channel busy ratio (CBR) in a coverage region thereof, wherein in each of time units constituting the first time period, each CBR is the percentage of the total frequency domain units of the time unit accounted for by frequency domain units exceeding a received signal strength indicator (RSSI) threshold ; the RSU determining a first congestion level according to the average CBR and a correspondence relationship between the average CBR and a congestion level; determining, according to the first congestion level, a configuration parameter corresponding to the first congestion level; and broadcasting a first message, such that all terminal apparatuses within the coverage region of the RSU perform service transmission according to the configuration parameter after receiving the first message. The above arrangement enables a CBR to be reduced quickly, thereby solving the congestion problem.

Description

Message sending method, message receiving method, device and equipment

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office on January 14, 2020, the application number is 202010037176.X, and the invention title is "a message sending method, message receiving method, device and equipment", all of which The content is incorporated in this application by reference.

Technical field

This application relates to the technical field of Internet of Vehicles, and in particular to a message sending method, message receiving method, device, and equipment.

Background technique

In order to improve the safety and intelligence of transportation systems, the concept of intelligent transportation systems is gradually emerging. Intelligent transportation can use a new generation of communication networks and data processing capabilities to improve the overall efficiency of the transportation system, reduce energy consumption, and increase the safety and convenience of transportation. V2X (vehicle to everything, vehicle to everything) is the key technology of the future intelligent transportation system. It uses vehicle to vehicle (V2V) communication, vehicle to infrastructure (V2I) communication, vehicle to passerby Communication methods such as vehicle to pedestrian (V2P) communication and vehicle to network (V2N) communication can obtain a series of traffic information such as real-time road conditions, road information, and pedestrian information, thereby improving driving safety, reducing congestion, and improving Traffic efficiency, provision of in-vehicle entertainment information, etc. Based on V2X technology, it can not only greatly improve traffic safety and reduce the rate of traffic accidents, but also provide low-cost, easy-to-implement technical routes and basic platforms for autonomous driving, intelligent transportation, and Internet of Vehicles innovation.

Among them, cellular-V2X (cellular-V2X, C-V2X) is a cellular network-based V2X technology defined by the 3rd Generation Partnership Project (3GPP). Furthermore, C-V2X technology uses two communication interfaces, PC5 interface and Uu interface. Among them, the PC5 interface is used to implement short-distance communication between the user equipment (UE) and the UE, or between the UE and the roadside unit (RSU); the Uu interface is used to implement the communication between the UE and the network side. Communication between UMTS terrestrial radio access network (UMTS terrestrial radio access network, UTRAN) and UE.

For a V2X system that uses a PC5 interface for communication, communication between UEs supports a scheduled resource allocation method (referred to as Mode 3, Mode 3) and a terminal autonomous resource allocation method (referred to as Mode 4, Mode 4). In addition, in mode 3, centralized scheduling can be performed based on the LTE-Uu interface; in mode 4, distributed resource scheduling can be performed based on the PC5 interface direct mode.

In the "mode 4" resource allocation method, each UE will use the PC5 interface to send its own information to other surrounding UEs, and then when two or more UEs want to use the same time-frequency resource at the same time, this leads to The allocation of the time-frequency resources conflicts, and all UEs cannot receive or send V2X messages on the same resource, which will affect the normal demodulation of V2X service packets and cause V2X message congestion.

For example, when UE1 and UE2 want to use a certain resource for V2X service transmission at the same time, but the resource is only allocated for use by UE1, which causes the V2X service packets of UE2 to fail to be transmitted normally, that is, the V2X message cannot be received at the expected time , It is necessary to wait for UE1 to use up the resource, and then allocate the corresponding resource to UE2 for V2X service transmission, which results in the service of UE2 being extended or suspended. Especially in areas with high vehicle density, V2X message congestion is becoming more prominent and obvious due to the limitation of available transmission resources.

Summary of the invention

This application aims to solve the technical problem of severe congestion in a specific area that affects the V2X transmission performance. In order to improve the reception performance of V2X messages and alleviate the message congestion of the terminal in the autonomous mode, this application discloses the following technical solutions:

In the first aspect, this application provides a message sending method, which can be applied to a roadside unit RSU, or a roadside device including the RSU, the method includes:

The RSU determines the average channel busy ratio CBR in the coverage area of the RSU within the first time period, and determines the first congestion level according to the average CBR and the correspondence between the average CBR and the congestion level; and determines the first congestion level according to the first congestion level. The configuration parameter corresponding to the first congestion level; and broadcasting a first message, the first message including the configuration parameter or the indication information of the configuration parameter, so that all terminal devices in the coverage area of the RSU are After receiving the first message, perform service transmission according to the configuration parameters.

Wherein, the average CBR is the average value of all CBRs in the first time period, and each CBR is the value exceeding the received signal strength indicator RSSI threshold on each time unit that constitutes the first time period The number of frequency domain units is a percentage of the total number of frequency domain units corresponding to the time unit.

In the method provided in this aspect, the roadside unit RSU measures the congestion level within a period of time according to the average CBR, and broadcasts the configuration parameters corresponding to the congestion level, and then controls all UEs within the coverage of the RSU to perform service transmission according to the configuration parameters This prevents the UE from adopting an autonomous resource allocation mode for service transmission. Since the RSU uniformly controls all UEs to perform service transmission in accordance with the indicated configuration parameters, the CBR can be quickly reduced, thereby solving the problem of congestion and ensuring the transmission and reception of V2X messages within the coverage of the RSU.

Optionally, the configuration parameters include at least one of the following: transmit power, HARQ retransmission, modulation and demodulation set MCS configuration, packet discarding rules, and packet transmission frequency.

With reference to the first aspect, in a possible implementation manner of the first aspect, determining the average CBR in the coverage area of the RSU within a first time period includes: RSU detecting the average CBR in the first time period On each time unit, the number of frequency domain units whose RSSI exceeds the RSSI threshold; calculate the CBR on each time unit according to the number of frequency domain units whose RSSI exceeds the RSSI threshold; And determining the average CBR in the coverage area of the RSU according to the CBR on all the time units. In this implementation, the RSSI threshold is used to determine the CBR on each time unit, and then the average CBR is determined, so as to better reflect the current vehicle congestion in the coverage of the RSU.

With reference to the first aspect, in another possible implementation manner of the first aspect, the method further includes: the RSU periodically obtains the average CBR in the coverage area of the RSU; and determines each broadcast according to the average CBR. The congestion level of the period; and broadcasting a first message in each period, the first message including configuration parameters for indicating the congestion level of the period or indication information of the configuration parameters. When the indication information is used to indicate the configuration parameters, overhead can be saved.

Optionally, the indication information of the configuration parameter is a Rank value of the congestion level.

In the second aspect, the present application provides a method for receiving a message, which is applied to a terminal device, such as an on-board unit OBU. The method includes: receiving a first message broadcast by a first roadside unit RSU, and Determine configuration parameters, and perform service transmission according to the configuration parameters.

Wherein, the first message includes the configuration parameter or the indication information of the configuration parameter; the configuration parameter is determined according to a first congestion level, and the first congestion level is determined by the first RSU during the first time period. The average channel busy ratio CBR in its coverage area is determined within the coverage area. The average CBR is the average value of all CBRs in the first time period, and each CBR is each time that constitutes the first time period. On the unit, the number of frequency domain units exceeding the received signal strength indication RSSI threshold accounts for the percentage of the total number of frequency domain units corresponding to the time unit.

In addition, the configuration parameters include at least one of the following: transmit power, HARQ retransmission, modem set MCS configuration, packet discarding rules, and packet transmission frequency. And these configuration parameters can be obtained through historical data or empirical statistics.

In the method provided in this aspect, the RSU uniformly broadcasts the first message, and each OBU determines configuration parameters according to the received first message, and performs V2X service transmission according to the configuration parameters, thereby effectively alleviating congestion.

With reference to the second aspect, in a possible implementation of the second aspect, when the first message includes the configuration parameter indication information, the terminal device determines the configuration parameter according to the first message, including : Determine the configuration parameter according to the indication information and the correspondence between the indication information and the configuration parameter corresponding to the indication information. Wherein, the corresponding relationship is pre-stored in the storage medium of the RSU and each OBU.

With reference to the second aspect, in another possible implementation of the second aspect, the method further includes: acquiring a first moment, where the first moment is the moment when the terminal device receives the first message; and determining Whether the first message sent by the first RSU at the second time is received within a preset time interval from the first time; the time interval between the second time and the first time is the first The broadcast period of the RSU, and the broadcast period is less than the preset time interval; if not, the configuration parameter indicated by the first message is exited, and service transmission is performed in an autonomous resource allocation manner.

In this implementation, the terminal device starts the timer when it receives the first message sent by the RSU, and determines whether the terminal device is within the area covered by the RSU through a preset time interval, thereby avoiding the terminal device from always following the configuration indicated by the RSU Parameters are used for service transmission, which improves the flexibility of service instructions.

With reference to the second aspect, in another possible implementation manner of the second aspect, the method further includes: receiving, at the terminal device, the first message broadcast by the first RSU and simultaneously receiving the message broadcast by the second RSU. In the case of the second message, parse the first message and the second message to obtain the first congestion level of the first message and the second congestion level of the second message; compare the first congestion level and For the size of the second congestion level, the message with the high congestion level is selected as the target message; service transmission is performed according to the configuration parameters indicated by the target message.

In this implementation, when the terminal device receives a message sent by two or more RSUs, it compares the rank value of the congestion degree, and uses the configuration parameter with the largest rank value to send and receive data, thereby effectively reducing CBR and alleviating congestion .

In addition, it should be noted that the first RSU and the second RSU described in this aspect may be the RSU in the foregoing first aspect or any one of the implementation manners of the first aspect, that is, whether it is the first RSU or the second RSU. All have the functions of implementing the methods described in the foregoing first aspect or various implementation manners of the first aspect.

In a third aspect, this application also provides a message sending device, which is applied to a roadside unit RSU, and includes:

A processing unit, configured to determine the average channel busy ratio CBR in the coverage area of the RSU in a first time period, where the average CBR is the average value of all CBRs in the first time period, and each CBR is a component In each time unit of the first time period, the number of frequency domain units exceeding the received signal strength indication RSSI threshold is a percentage of the total number of frequency domain units corresponding to the time unit.

The processing unit is further configured to determine a first congestion level according to the average CBR and the corresponding relationship between the average CBR and the congestion level; and determine the configuration parameter corresponding to the first congestion level according to the first congestion level.

The sending unit is configured to broadcast a first message, and the first message includes the configuration parameter or the indication information of the configuration parameter, so that all terminal devices in the coverage area of the RSU will receive the first message , And perform service transmission according to the configuration parameters.

With reference to the third aspect, in a possible implementation of the third aspect, the processing unit is specifically configured to detect that the RSSI exceeds the RSSI threshold for each time unit in the first time period The number of frequency domain units of the; according to the number of frequency domain units whose RSSI exceeds the RSSI threshold, the CBR on each time unit is calculated; and the RSU is determined according to the CBR on all the time units The average CBR within the coverage area.

With reference to the third aspect, in another possible implementation manner of the third aspect, the processing unit is further configured to periodically obtain the average CBR in the coverage area of the RSU; and determine each CBR according to the average CBR. The congestion level of the broadcast period; the sending unit is further configured to broadcast a first message in each period, and the first message includes a configuration parameter for indicating the congestion level of the period or indication information of the configuration parameter .

In a fourth aspect, the present application also provides a message receiving device, the device comprising: a receiving unit configured to receive a first message broadcast by a first roadside unit RSU, the first message including the configuration parameter or Indication information of the configuration parameter; the configuration parameter is determined according to a first congestion level, and the first congestion level is determined by the first RSU in the first time period to determine the average channel busy ratio CBR in its coverage area The average CBR is the average value of all CBRs in the first time period, and each CBR is the frequency that exceeds the received signal strength indicator RSSI threshold on each time unit constituting the first time period. The number of domain units accounts for the percentage of the total number of frequency domain units corresponding to the time unit; the processing unit is configured to determine configuration parameters according to the first message, and perform service transmission according to the configuration parameters.

With reference to the fourth aspect, in a possible implementation of the fourth aspect, the processing unit is specifically configured to, when the first message includes the indication information of the configuration parameter, according to the indication information, and The corresponding relationship between the indication information and the configuration parameter corresponding to the indication information determines the configuration parameter.

With reference to the fourth aspect, in another possible implementation manner of the fourth aspect, the processing unit is further configured to obtain the first moment, and determine whether the received data is received within a preset time interval from the first moment. The first message sent by the first RSU at the second time; the time interval between the second time and the first time is the broadcast period of the first RSU, and the broadcast period is less than the preset time interval If not, exit the configuration parameters indicated by the first message, and perform service transmission in an autonomous resource allocation manner; the first moment is the moment when the terminal device receives the first message.

With reference to the fourth aspect, in another possible implementation manner of the fourth aspect, the method further includes: the receiving unit is further configured to receive the second message while receiving the first message broadcast by the first RSU The second message broadcast by the RSU; the processing unit is further configured to parse the first message and the second message to obtain the first congestion level of the first message and the second congestion level of the second message; Comparing the size of the first congestion level and the second congestion level, selecting the message with the higher congestion level as the target message; and performing service transmission according to the configuration parameters indicated by the target message.

In a fifth aspect, the present application also provides a communication device, including a processor and a memory, the processor is coupled to the memory, and the memory is used to store instructions; the processor is used to call the instructions to cause the The device executes the foregoing first aspect and the methods in various implementation manners of the first aspect.

In addition, the processor is further configured to call the instructions to make the device execute the foregoing second aspect and the methods in various implementation manners of the second aspect.

In a sixth aspect, the present application also provides a computer-readable storage medium, including instructions, which when run on a computer, implement the methods described in the foregoing first aspect or various implementation manners of the first aspect, and , The method described in the foregoing second aspect or various implementation manners of the second aspect.

In the seventh aspect, the present application also provides a computer program product, which when running on a computer, implements the methods described in the foregoing first aspect or various implementation manners of the first aspect, and the foregoing second aspect or first aspect In the second aspect, the methods described in various implementations.

In a message sending method provided by this application, the RSU measures the congestion level within a period of time according to the average CBR, and broadcasts the configuration parameters corresponding to the congestion level, thereby controlling all UEs within the coverage of the RSU to perform services according to the configuration parameters Transmission prevents the UE from adopting an autonomous resource allocation mode for service transmission.

In addition, because the RSU uniformly controls all UEs to perform service transmission in accordance with the indicated configuration parameters, the CBR can be quickly reduced, thereby solving the problem of congestion and ensuring the transmission and reception of V2X messages within the coverage of the RSU.

Description of the drawings

FIG. 1A is a schematic diagram of a system architecture of an Internet of Vehicles provided by an embodiment of this application;

FIG. 1B is a schematic diagram of another system architecture of the Internet of Vehicles provided by an embodiment of the application;

FIG. 2 is a flowchart of a method for sending a message according to an embodiment of the application;

FIG. 3 is a schematic diagram of a transmission resource provided by an embodiment of this application;

FIG. 4 is a flowchart of a method for receiving a message according to an embodiment of the application;

FIG. 5A is a flowchart of a congestion control method provided by an embodiment of this application;

5B is a signaling flowchart of another method for sending messages according to an embodiment of the application;

FIG. 6 is a schematic diagram of a scenario of a congestion control mechanism provided by an embodiment of the application;

FIG. 7 is a schematic diagram of a scenario of another congestion control mechanism provided by an embodiment of the application;

FIG. 8 is a schematic structural diagram of a message sending device provided by an embodiment of this application;

FIG. 9 is a schematic structural diagram of a message receiving apparatus provided by an embodiment of the application;

FIG. 10 is a schematic structural diagram of a communication device provided by an embodiment of this application.

Detailed ways

The technical solution of the present application will be described below in conjunction with the drawings in the embodiments of the present invention.

In order to facilitate the understanding of the technical solutions provided by the embodiments of the present invention, the following first describes the network institutions to which the embodiments of the present invention are applicable. Please refer to FIG. 1A, which is a schematic diagram of a system architecture of an Internet of Vehicles disclosed in an embodiment of the present application. As shown in FIG. 1A, the system includes an Internet of Vehicles server 10 and an onboard unit (OBU) 20. Among them, the Internet of Vehicles server 10 and the OBU 20 are connected through a communication network 40.

Further, the Internet of Vehicles server 10 may be an independent service device in the Internet, or may be a cluster service device composed of multiple independent service devices in the Internet; the Internet of Vehicles server 10 may be used to process Internet of Vehicles applications in realizing Various requirements for information interaction, message sending and other functions. Exemplarily, the Internet of Vehicles server 10 may be an electronic map server, a fleet management server, an autonomous driving server, or a social network (SNS) server.

In addition, the system also includes a roadside unit (RSU) 30. The RSU 30 is connected to the Internet of Vehicles server 10 through a communication network 40. The RSU 30 can be deployed on roadside equipment and has V2X communication. The entity of ability. The embodiments of the present application do not limit the specific form of the RSU.

It should be understood that the technical solutions of the embodiments of the present application can be applied to various communication systems, such as: global system for mobile communications (GSM) system, code division multiple access (CDA) system, and broadband code Wide band code division multiple access (WCDMA) system, general packet radio service (GPRS), long term evolution (LTE) system, LTE frequency division duplex (FDD) ) System, LTE time division duplex (TDD), universal mobile telecommunication system (UMTS), worldwide interoperability for microwave access (WiMAX) communication system, the fifth in the future Generation (5th generation, 5G) system or new radio (NR), etc.

In addition, the roadside unit 30 and the vehicle-mounted unit 20 described in this embodiment are both a kind of terminal equipment. Further, the terminal equipment may refer to a user equipment, an access terminal, a user unit, a user station, a mobile station, and a mobile station. , Remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device. The terminal equipment can also be a cellular phone, a cordless phone, a session initiation protocol (session initiation protocol, SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (personal digital assistant, PDA), with wireless communication Functional handheld devices, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in the future 5G network, or future evolution of the public land mobile network (PLMN) Terminal equipment, etc., this embodiment of the present application is not limited thereto.

Referring to Fig. 1B, Fig. 1B is a schematic diagram of another system architecture of the Internet of Vehicles provided by an embodiment of the present application. Including: IoV server 10, vehicle-mounted unit 20, roadside unit 30, etc. Among them, the Internet of Vehicles server 10 is used for V2X authorization and the issuance of related parameters.

In addition, the system may also include a mobility management entity (MME), S/P-GW (serving gateway), or home subscriber server (home subscriber server, HSS), etc. Among them, the MME or S/P-GW is used to provide bearer establishment between the roadside unit 30 and the Internet of Vehicles server 10. The HSS is used to store the contract data of the roadside unit 30. Exemplarily, E-UTRAN and MME can communicate through S1 interface, MME and HSS can communicate through S6a interface, HSS and V2X control function equipment can communicate through V4 interface, S/P-GW The SGi interface can be used to communicate with the Internet of Vehicles server 10.

In the LTE system or the NR system, the communication interface between the user equipment (UE) and the base station (eNB/gNB) is called the Uu interface. On the Uu interface, the link through which the UE sends data to the base station is called the uplink, and the link through which the UE receives data from the base station is called the downlink. The communication interface between UE and UE is called PC5 interface. The link that transmits data between the UE and the UE on the PC5 interface is called a side link. The PC5 interface is generally used in V2X or D2D scenarios where direct communication between devices can be carried out.

In Figure 1B, the RSU and the Evolved Universal Terrestrial Radio Access Network (E-UTRAN) communicate through the Uu interface, and the OBU and E-UTRAN also communicate through the Uu interface. That is, the Uu interface is used for the communication connection between the terminal equipment UE and the network side base station. RSU (fixed UE1) and OBU (vehicle UE2) communicate through the PC5 interface. In addition, the communication between the vehicle and the vehicle can also be communicated with the PC5 interface. And in the LTEV2X system, only broadcast services are supported. The radio bearers on the PC5 port are respectively established and configured by the originating UE and the receiving UE. The sending UE and the receiving UE do not need to coordinate the configuration of the radio bearer.

The technical solutions provided by the embodiments of the present application will be described in detail below.

This embodiment provides a message sending method to solve the problem of congestion in a specific area caused by the UE using an autonomous resource allocation method for V2X service transmission under the V2X technology.

Specifically, refer to FIG. 2, which is a flowchart of a method provided in this embodiment. include:

101: The roadside unit RSU determines the average channel busy ratio (CBR) in the coverage area of the RSU in the first time period.

Wherein, the average CBR is the average value of all CBRs in the first time period, and each CBR is the value exceeding the received signal strength indicator RSSI threshold on each time unit that constitutes the first time period The number of frequency domain units is a percentage of the total number of frequency domain units corresponding to the time unit.

The RSU coverage area refers to the range covered by the RSU transmitting the V2X message according to the preset power, that is, the farthest distance for the terminal, such as the OBU, to receive the V2X message broadcast by the RSU.

Among them, the total bandwidth or total transmission resources include: time domain resources and frequency domain resources. The first time period on the time domain resource includes at least one time unit. The time unit may be a subframe, a frame, a slot, or the like. The frequency domain resource includes at least one frequency domain unit, and the frequency domain unit may be a subchannel or a subcarrier.

The received signal strength indication (RSSI) is an indicator value of signal strength, and the unit is dbm (decibel milliwatt), which represents the relative relationship between a certain power and 1 milliwatt mw. RSSI can be used to determine the link quality, and RSSI is a measurement of the received radio frequency energy. Generally, the WLAN provider can define the RSSI value in a private way. The RSSI value can be measured and obtained by the receiving end (such as RSU) network card. Further, there is an interface PMD_RSSI.indicate about RSSI in the physical layer primitives at the receiving end, that is, after the receiving end network card measures the RSSI value, the RSSI value can be obtained from this program interface. The RSSI threshold can be preset by the system or the supplier.

Specifically, step 101 includes:

First, the RSU detects the number of frequency domain units whose RSSI exceeds the RSSI threshold in each time unit in the first time period. Then, the RSU calculates the CBR on each time unit according to the number of frequency domain units whose RSSI exceeds the RSSI threshold. Finally, the RSU determines the average CBR in the coverage area of the RSU according to the CBR on all the time units.

For example, as shown in FIG. 3, the time unit is a subframe, and the first time period includes multiple subframes. In the frequency domain, each subframe corresponds to 5 subchannels. In addition, more or fewer subchannels may be included. In this embodiment, each subframe includes 5 subchannels, and the numbers are subchannels 1, 2, 3, 4, and 5 respectively. The RSU measures the RSSI value of each of the five sub-channels, and compares the RSSI value of each sub-channel with the RSSI threshold value, and screens out the sub-channels that exceed the RSSI threshold value. As shown in Figure 3, in the first subframe, only the RSSI value of subchannel 1 exceeds the RSSI threshold, and the number is one, then CBR1=1/5=20%.

Similarly, calculate the CBR of all subframes in the first time period. For example, CBR2, CBR3,..., CBRn, n is the number of subframes included in the first time period, and n≥1 and is a positive integer.

The RSU calculates the average value of CBR2, CBR3, ..., CBRn to obtain the average CBR in the first time period.

102: The RSU determines the first congestion level according to the average CBR and the correspondence between the average CBR and the congestion level.

An implementation manner is that the RSU pre-stores the correspondence between the average CBR and the congestion level, and determines the first congestion level according to the correspondence and the average CBR. The corresponding relationship is shown in Table 1.

Table 1. Correspondence between average CBR and congestion level

Congestion Level Rank	Average CBR(x)
0	x≤CBR threshold 1
1	CBR threshold 1＜x≤CBR threshold 2
2	CBR threshold 2＜x≤CBR threshold 3
...	...

m	CBR threshold m＜x

Wherein, the average CBR can be represented by "x". The congestion level (Rank) is sorted from 1 to m, and the degree of congestion increases. That is, the smaller the Rank value, the lower the degree of congestion; the larger the Rank value, the higher the degree of congestion.

For example, when x satisfies the CBR threshold 1<x≦CBR threshold 2, the first congestion level is determined to be 2; when x is greater than the CBR threshold m, the first congestion level is determined to be m, and the congestion degree is the highest at this time.

103: The RSU determines the configuration parameter corresponding to the first congestion level according to the first congestion level.

The configuration parameters may be obtained through historical data statistics, or obtained through pre-measurement from the network side. This embodiment does not limit the manner of obtaining the configuration parameters. Further, the configuration parameters include at least one of the following: transmit power, HARQ retransmission, MCS configuration, packet discarding rules, packet transmission frequency, and so on. Specifically, in the above configuration parameters,

(1) The transmit power refers to the transmit power (power, Pwr) of the V2X message sent by a terminal device (such as an OBU).

(2) The parameter of Hybrid Automatic Repeat reQuest (HARQ) can be used to indicate whether the OBU performs HARQ retransmission, for example, "1" means HARQ retransmission, and the number of retransmissions is 1; "0" means HARQ retransmission is not used.

Optionally, the indicating characters "1" and "0" can also be represented by other characters, such as n0 and n1.

(3) Modulation coding scheme (MCS) can be used to ensure the efficiency and quality of V2X service transmission. Among them, the MCS value can be divided into high-order and low-order modulation modes according to the size. When congested, the MCS value is indicated to be small and the low-order modulation mode is used; when not congested, the MCS value is indicated to be large and the high-order modulation mode is used.

(4) Packet discarding rules. The packet discarding rule includes packet loss and no packet loss, and the first indication information may not only be used to indicate whether a packet is lost, but also the type and quantity of specific lost packets. For example, to classify the data packets to be sent, that is, the monotonic priority (prose per packet priority, PPPP) of each packet. Specifically, a specific field "pppp" in the V2X data packet can be used to indicate the service level of the data packet If the service level indicated by this field is greater than the preset level, for example, pppp1 represents the first preset level, then no packet is lost; if pppp≤pppp1, then the packet is lost. Wherein, the service level pppp of the data packet may be configured according to the service when the upper layer applies the packet grouping.

(5) Frequency of outsourcing. The packet sending frequency refers to the number of V2X data packets sent per second by the upper-layer service of the terminal equipment. Among them, the frequency of sending packets decreases as the congestion level increases.

In addition, the first indication information also includes other configuration indications, such as indicating an application-level control mode. Further, the application layer message may be instructed to send only application messages indicated by a service provider identifier (service provider identifier, PSID), and not send other types of V2X messages. Or, it may also include a parameter indicating the speed limit of the vehicle, such as a speed threshold, and other reserved fields.

Exemplarily, the following methods can be used to predefine configuration parameters at the code level.

In this embodiment, the application layer message exchanged on the PC5 interface of the terminal device directly connected to the communication defines the application PSID as a specific value and uses the congestion control (congestionCTL) parameter defined as follows, where CTL is an abbreviation for control.

MessageFrame::=CHOICE{//Message frame, select,

...

CongFrameCongestionCTL, //Select, congestion control parameters,

}

[ASN.1 code:]

CongestionCTL::=SEQUENCE{//Congestion control parameter: define a sequence,

msgCntMsgCount, //Through the following messages and a certain number of message definitions,

Pwr TxPWR, //Pwr parameter, PWR at the transmitter,

--Indicates the maximum transmission power for transmission on PSSCH and PSCCH//Indicates the maximum transmission power transmitted on PSSCH and PSCCH;

Mcs MCS OPTIONAL, //Mcs parameter, including MCS option,

--Indicates the MCS values used for transmissions on PSSCH // Indicates that an MCS value is used for transmission on PSSCH;

Retx ReTX, //Retx parameter, retransmission parameter TX,

--Indicates the allowed retransmission number for transmissions on PSSCH. The value n0 indicators no retransmission for a transport block allowed; the value n1 indicators that the UE shall perform one retransmission for a transport/block. , Where the value n0 indicates that retransmission is not allowed on the resource transmission block; the value n1 indicates that the UE is allowed to retransmit once on the resource transmission block.

Drop PPPP OPTIONAL // Packet loss parameters, PPPP options,

--Indicates a pppp threshold, drop the packets when below the threshold//Indicates a pppp threshold, and when it is lower than the threshold, data packets are dropped;

Packetfreq Packetfreq OPTIONAL, //Packetfreq parameter, packet sending frequency parameter option;

--Indicates packet delivery frequency // Indicates the frequency of packet delivery;

Optionally, also define speed threshold parameters, which specifically include:

SpeedLimits SpeedLimitList OPTIONAL, //SpeedLimits parameter, speed limit list option,

--Indicates a UE speed threshold // Indicates the UE moving speed threshold,

reserve, //Reserved

--reserve //Reserve

According to the foregoing predefined configuration parameters, the configuration parameters indicated by the first indication information are obtained as shown in Table 2.

Table 2 shows the correspondence between the congestion level and the configuration parameters of service transmission

Among them, Pwr 1>Pwr 2>…>Pwr n; MCS 0>MCS 1>…>MCS n; pppp1<pppp2<…<pppp n; f1>f2>…>fn.

For example, when the first congestion level determined in step 102 is "2", according to the corresponding relationship in Table 2, the configuration parameter indicated by the first indication information is obtained as: transmit power Pwr 2, HARQ retransmission once, and MCS 2 When pppp<pppp2, the packet is lost, and the frequency of sending packets does not exceed f2, etc.

104: The RSU broadcasts a first message, and the first message includes the configuration parameter or the indication information of the configuration parameter, so that all terminal devices in the coverage area of the RSU, after receiving the first message, follow The configuration parameters are used for service transmission.

Specifically, the RSU uses the PC5 interface to periodically broadcast the first message to all OBUs in the coverage area. Correspondingly, any OBU within the coverage of the RSU periodically receives the first message sent by the RSU.

Optionally, the first message is a V2X message, and the V2X message includes the configuration parameter or indication information for indicating the configuration parameter. Further, the indication information is a rank value of the congestion level.

Optionally, the V2X message includes the configuration parameter and the congestion level Rank value corresponding to the configuration parameter.

In addition, the RSU measures and generates a first message at regular intervals, and then broadcasts it to all terminal devices within its coverage. For example, the first V2X message is sent at the first time t1 and the second V2X message is sent at the second time t2. V2X message, and the configuration parameters indicated in the first V2X message and the second V2X message may be the same or different, which may be specifically determined according to the congestion level.

In the method provided in this embodiment, the roadside unit RSU measures the congestion level within a period of time according to the average CBR, and broadcasts the configuration parameters corresponding to the congestion level, and then controls all UEs within the coverage of the RSU to perform services according to the configuration parameters. Transmission prevents the UE from adopting an autonomous resource allocation mode for service transmission. Since the RSU uniformly controls all UEs to perform service transmission in accordance with the indicated configuration parameters, the CBR can be quickly reduced, thereby solving the problem of congestion and ensuring the transmission and reception of V2X messages within the coverage of the RSU.

For example, when congestion occurs, by controlling the packet sending frequency to limit the frequency of upper-layer services to send data packets within a preset frequency range, the CBR can be reduced and congestion can be alleviated. Set HARQ retransmission to no retransmission to reduce the number of packets to be sent, thereby reducing CBR and alleviating congestion.

In addition, as shown in FIG. 4, the method further includes:

105: The terminal device receives the first message broadcast by the RSU, where the first message includes the configuration parameter or the indication information of the configuration parameter.

106: The terminal device determines configuration parameters according to the first message.

An implementation manner is that, in the case where the configuration parameter is included in the first message, the terminal device directly obtains the configuration parameter from the first message.

In another implementation manner, the terminal device obtains the indication information of the configuration parameter carried in the first message, for example, the indication information indicates the congestion level Rank value, and according to the corresponding relationship between the Rank value and the configuration parameter, as shown in Table 2. Show, determine the configuration parameters.

107: The terminal device performs service transmission according to the configuration parameter.

Specifically, the first message is a V2X message. After receiving the V2X message at the application layer through the Uu interface, the terminal device parses the V2X message to obtain the configuration parameter, and adjusts each terminal device according to the configuration parameter. Parameter information, and use these parameters for V2X service communication.

For example, when the congestion level Rank value is m, adjust the transmit power to Pwr n, do not perform HARQ retransmission, and use the demodulation and modulation mode of Mcs n. When the priority of the data packet is less than pppp n, the packet loss and the packet transmission frequency No more than fn, which can reduce CBR and reduce traffic congestion.

In addition, the above method also includes that when the vehicles in the coverage area of the RSU are reduced to no congestion, or the terminal device moves out of the area covered by the RSU, the terminal device exits the configuration parameter mode indicated by the RSU, and uses the autonomous mode for service transmission , Specifically, as shown in Figure 5A, including:

201: The terminal device obtains the first moment. The first moment is the moment when the terminal device receives the first message.

For example, the moment when the UE receives the first V2X message from the RSU is the first moment. Wherein, the first time is denoted as t1, and the timer starts timing at time t1.

202: The terminal device determines whether the first message sent by the RSU at the second time is received within a preset time interval from the first time.

The time interval between the second time and the first time is a broadcast period of the RSU, and the broadcast period is less than the preset time interval.

Specifically, the UE determines whether the second V2X message sent by the RSU is received within a preset time interval starting from the t1. Wherein, when the UE receives the second V2X message, it records the second time t2, the time interval between the first time t1 and the second time t2 is Δt, Δt=t2-t1, and step 202 determines whether the Δt is less than It is equal to the preset time interval t preset, and Δt≤t _preset .

If no, go to step 203; if yes, go to step 204.

203: If the first message sent by the RSU, that is, the V2X message, is not received within the _preset time interval from t1 to t, then exit the configuration parameter indicated by the first message, and follow the autonomous resource allocation method Perform business transfers.

Specifically, Δt>t is _preset , the timer expires, and the V2X message broadcast by the RSU is not received within the preset time interval, and the UE may no longer be within the area covered by the RSU, the UE exits the current congestion level Rank( The control mode of the configuration parameters indicated by the first message) is restored to the parameter mode of autonomous configuration, and data packets are received and sent according to the parameter mode of autonomous configuration.

204: If the UE receives the first message broadcast by the RSU at time t2, it performs service transmission according to the configuration parameters indicated by the first message broadcast at the second time t2.

Wherein, the configuration parameter received at time t2 may be the same or different from the configuration parameter received by the UE at time t1.

In addition, each time the UE receives the first message broadcast by the RSU (that is, the V2X message), the timer restarts timing to determine whether the first message broadcast by the RSU is received again within the preset time interval from this moment.

Specifically, as shown in FIG. 5B, taking the OBU and the RSU as an example, the OBU and the RSU both include an application layer (App layer) and an access layer (access layer). Among them, the application layer includes V2Xapp, network layer and/or adaptation layer; the access layer includes wireless communication modules. Optionally, the wireless communication module may include: C-V2X packet data convergence control (Packet Data Convergence Control, PDCP), radio link control (Radio Link Control, RLC), and media access control layer ( Medium Access Control (MAC) and Physical Layer (PHY).

The foregoing embodiment combines the structure of the application layer and the access layer of the OBU and RSU, and the message sending method specifically includes:

S1: The RSU access layer sends a channel detection congestion notification to the RSU application layer. Specifically, the process of detecting channel congestion can refer to the foregoing step 101.

S2: The RSU application layer receives the channel detection congestion notification, and determines the configuration parameters according to the configuration table.

Wherein, the configuration table includes the aforementioned Table 1 and Table 2, and the specific process can refer to the aforementioned steps 102 and 103.

S3: The RSU application layer broadcasts this configuration parameter. Specifically, an implementation manner is that the RSU application layer broadcasts the configuration parameters in a manner carried by the first message.

Optionally, the first message is a V2X message. The specific process is the same as the aforementioned step 104.

S4: The OBU application layer receives the first message broadcast from the RSU application layer, and adjusts the scheduling according to the first message.

Specifically, the OBU application layer determines the configuration parameters according to the first message. For the specific determination method, refer to the foregoing step 106.

S5: The OBU application layer sends the first message to the OBU access layer. Correspondingly, the OBU access layer receives the first message sent by the OBU application layer.

S6: The OBU access layer performs service transmission according to the configuration parameters in the first message. The specific process is the same as the aforementioned step 107.

It also includes: S7, the RSU access layer sends a notification to the RSU application layer when the detected channel detection congestion is lower than the threshold.

Wherein, the process of the RSU access layer detecting the channel detection congestion is the same as the foregoing step S1 or the step 101 of the foregoing embodiment, and will not be repeated here. And the RSU access layer can detect periodically, and it can also detect channel congestion in real time. The RSU access layer reports the current network resource congestion to the RSU application layer according to the different levels of congestion detected.

S8: The RSU application layer is configured to be in a normal state after receiving the notification from the RSU access layer.

When the RSU application layer determines that the current network is not congested according to the notification reported by the RSU access layer, it adjusts the configuration parameters of service transmission to the transmission parameters in the normal state.

S9: The RSU application layer broadcasts the second message to the OBU. Specifically, the RSU application layer notifies the OBU of the current situation that the network is not congested through the second message.

Optionally, the second message is a V2X message.

S10: The OBU application layer receives the second message broadcast from the RSU application layer, exits the service transmission module under congestion, and returns to the independently configured parameter mode.

S11: The OBU application layer sends a congestion exit notification to the OBU access layer.

S12: The OBU access layer receives the notification, and performs data packet transmission according to the independently configured parameter mode. The specific process is the same as the aforementioned step 203, and will not be repeated here.

The method provided in this embodiment starts a timer when the terminal device receives the first message sent by the RSU, and determines whether the terminal device is within the area covered by the RSU through a preset time interval, thereby preventing the terminal device from always following the RSU The indicated configuration parameters are used for service transmission, which improves the flexibility of service indications.

Optionally, the method provided in this embodiment further includes:

If the UE simultaneously receives V2X messages sent by two RSUs at a certain moment, for example, OBU1 is located in the overlapping area of the coverage of the first RSU and the second RSU, at a certain moment the UE will simultaneously receive the V2X messages from the first RSU The first message and the second message from the second RSU, and the first message and the second message each carry the configuration parameters indicated by the RSU. As shown in Figure 6, at this time, OBU1 compares the size of the congestion level Rank indicated in the first message and the second message, and uses the V2X message with a larger congestion level Rank value as the target message, and executes the configuration corresponding to the target message parameter. Because a large Rank value indicates serious congestion, control according to the configuration parameters of the serious congestion can better solve the congestion problem.

In a specific embodiment, an RSU and all OBUs within the coverage of the RSU are taken as an example to illustrate the method provided in the foregoing embodiment.

As shown in Figure 7, in scenario 1, the RSU coverage area contains three OBUs, namely OBU1, OBU2, and OBU3, and each OBU can perform V2X service transmission in an autonomous resource scheduling manner.

After a period of time, in scenario 2, the density of vehicles in the coverage area of the RSU increases, the number of OBUs is congested, and the RSU starts the congestion control mechanism. At this time, the RSU detects and calculates the congestion level of the current period, and determines the corresponding congestion configuration parameter according to the congestion level, and broadcasts the congestion configuration parameter to all OBUs in its coverage area through the PC5 interface. Specifically, the RSU broadcasts the first A V2X message, where the first V2X message includes a first congestion level and/or a congestion configuration parameter corresponding to the first congestion level.

Each OBU receives the first V2X message broadcast by the RSU, and the timer starts counting. And the first V2X message is parsed to obtain congestion configuration parameters, and V2X data packets are received and sent according to the congestion configuration parameters.

When the RSU detects that the number of vehicles in its coverage area has decreased, it exits the congestion control mechanism. For example, in scenario 3, when the number of OBUs is reduced, no congestion occurs or the congestion level Rank value is 0, then all OBUs within the coverage of the RSU can withdraw from the control of the congestion configuration parameters scheduled by the RSU, according to the autonomous resource allocation of the terminal Mode (referred to as Mode 4) for V2X service transmission.

Or, each OBU starts from receiving the first V2X message broadcast by the RSU, and judges whether the timer expires, in other words, it judges whether the V2X message that the RSU continues to broadcast is received within a preset time interval. If not, Then the OBU may move outside the coverage area of the RSU, then exit the centralized congestion control mechanism, and perform service transmission in the manner of "Mode 4" autonomous scheduling.

In addition, under the congestion control mechanism, if OBU1 receives the first V2X message sent by RSU1 and the second V2X message sent by RSU2 at a certain moment, it compares the congestion level Rank in the first V2X message and the second V2X message. If the Rank1 in the first V2X message is greater than the Rank2 in the second V2X message, the service is sent and received according to the congestion configuration parameters indicated by Rank1 in the first V2X message. Conversely, if Rank1 is less than Rank2, the service is sent and received according to the congestion configuration parameters indicated by Rank1 in the second V2X message.

The method provided in this embodiment solves the defect that the base station or the network side does not support the C-V2X function by configuring the centralized control function in the RSU, and enables the RSU to implement the C-V2X function within the wireless network area covered by it, including mode 3 C-V2X resource centralized scheduling function and mode 4 broadcast C-V2X system messages (including sending configuration parameters) function. As a result, the RSU device for congestion control in this solution can be flexibly deployed on road sections with high vehicle density in urban areas. When the vehicle enters the coverage of the RSU, the vehicle receives the RSU broadcast V2X message, and schedules service data according to the configuration parameters carried in the V2X message, thereby effectively reducing congestion. Specifically:

First, all vehicles use the transmission power indicated by the configuration parameters to send messages. The transmission power is generally less than the power of autonomous transmission, so that in the event of congestion, the information sent by the remote vehicle has less impact on the vehicle and avoids the difference between the vehicle and the vehicle. Send messages between each other to influence each other.

Second, the RSU determines the congestion level according to the average CBR obtained, and instructs the access layer of all vehicles to uniformly adjust according to the configuration parameters indicated by the RSU, such as indicating whether the number of HARQ retransmissions, MCS, PPPP priority, etc., and may follow the configuration The parameter discards packets with lower priority, thereby reducing CBR and alleviating congestion.

In addition, the methods described in the foregoing embodiments of the present application may also implement corresponding functions through software modules. As shown in FIG. 8, a message sending device is provided. The device includes a processing unit 801 and a sending unit 802, and may also include other functional modules or units, such as an acquisition unit, a storage unit, and the like.

Further, the processing unit 801 is configured to determine the average channel busy ratio CBR in the coverage area of the RSU in a first time period, where the average CBR is the average value of all CBRs in the first time period, and each The CBR is the percentage of the number of frequency domain units that exceed the received signal strength indicator RSSI threshold value in each time unit constituting the first time period to the total number of frequency domain units corresponding to the time unit. The processing unit 801 is further configured to determine a first congestion level according to the average CBR and the corresponding relationship between the average CBR and the congestion level; determine the configuration parameter corresponding to the first congestion level according to the first congestion level;

The sending unit 802 is configured to broadcast a first message, and the first message includes the configuration parameter or the indication information of the configuration parameter, so that all terminal devices in the coverage area of the RSU will receive the first message. , And perform service transmission according to the configuration parameters.

Optionally, in a specific implementation manner of this embodiment, the processing unit 801 is specifically configured to detect the frequency domain where the RSSI exceeds the RSSI threshold for each time unit in the first time period The number of units; calculate the CBR on each time unit according to the number of frequency domain units where the RSSI exceeds the RSSI threshold; and determine the coverage area of the RSU according to the CBR on all the time units The average CBR.

Wherein, the configuration parameters include one or more of: transmit power, whether to request HARQ retransmission with hybrid automatic repeat, modem set MCS configuration, packet discarding rule, packet sending frequency, etc.

Optionally, in another specific implementation manner of this embodiment, the processing unit 801 is further configured to periodically obtain the average CBR in the coverage area of the RSU; and determine the average CBR of each broadcast period according to the average CBR. Congestion level; the sending unit 802 is further configured to broadcast a first message in each period, and the first message includes configuration parameters for indicating the congestion level of the period or indication information of the configuration parameters.

Corresponding to the embodiment of the message sending device, the embodiment of the present application also provides a message receiving device. As shown in FIG. 9, the device includes: a receiving unit 901, a processing unit 902, and a sending unit 903, and may also include other functional modules. Or unit, such as storage unit, etc.

Further, the receiving unit 901 is configured to receive a first message broadcast by the first roadside unit RSU, where the first message includes the configuration parameter or the indication information of the configuration parameter; the configuration parameter is based on the first congestion level It is determined that the first congestion level is determined by the first RSU determining the average channel busy ratio CBR in its coverage area during the first time period, and the average CBR is the average of all CBRs in the first time period Each CBR is the percentage of the number of frequency domain units that exceed the RSSI threshold of the received signal strength indicator to the total number of frequency domain units corresponding to the time unit on each time unit that composes the first time period . The processing unit 902 is configured to determine configuration parameters according to the first message, and perform service transmission according to the configuration parameters.

Wherein, the configuration parameter includes at least one of the following: transmit power, whether to request HARQ retransmission with hybrid automatic repeat, modem set MCS configuration, packet discarding rule, packet sending frequency, etc.

Optionally, in a specific implementation manner of this embodiment, the processing unit 902 is specifically configured to: when the first message includes the indication information of the configuration parameter, according to the indication information, and the The corresponding relationship between the indication information and the configuration parameter corresponding to the indication information determines the configuration parameter.

Optionally, in another specific implementation manner of this embodiment, the processing unit 902 is further configured to obtain the first moment, and determine whether the first moment is received within a preset time interval from the first moment. A first message sent by an RSU at a second time; the time interval between the second time and the first time is the broadcast period of the first RSU, and the broadcast period is less than the preset time interval; if If not, exit the configuration parameters indicated by the first message, and perform service transmission in an autonomous resource allocation manner; the first moment is the moment when the terminal device receives the first message.

Optionally, in another specific implementation manner of this embodiment, the receiving unit 901 is further configured to receive the second message broadcast by the second RSU while receiving the first message broadcast by the first RSU The processing unit 902 is further configured to parse the first message and the second message to obtain the first congestion level of the first message and the second congestion level of the second message; compare the first congestion level And the size of the second congestion level, selecting the message with the high congestion level as the target message; and performing service transmission according to the configuration parameters indicated by the target message.

In addition, an embodiment of the present application also provides a communication device. The communication device may be the message sending device or a structure of the message receiving device involved in the foregoing embodiment, and is used to implement the message sending described in the foregoing embodiment. Method, and message receiving method.

As shown in FIG. 10, the communication device includes a processor 110, a transceiver 120, and a memory 130. In addition, it can also include other devices or modules, such as cameras, sensors, touch screens, and so on. The memory 130 is coupled with the processor 110, and the memory 130 stores a computer program necessary for the communication device.

For example, in one embodiment, when the communication device has an RSU or a functional device including the RSU, the processor 110 is configured to determine an average CBR in the coverage area of the RSU within a first time period, and according to the average CBR and the correspondence between the average CBR and the congestion level determine the first congestion level, determine the configuration parameter corresponding to the first congestion level according to the first congestion level, and control the transceiver 120 to broadcast the first message so that After receiving the first message, all terminal devices in the coverage area of the RSU perform service transmission according to the configuration parameters.

Wherein, the first message includes the configuration parameter or the indication information of the configuration parameter. The average CBR is the average value of all CBRs in the first time period, and each CBR is the frequency domain that exceeds the received signal strength indicator RSSI threshold on each time unit constituting the first time period The percentage of the number of units to the total number of frequency domain units corresponding to the time unit;

In addition, the processor 110 is further configured to detect the number of frequency domain units whose RSSI exceeds the RSSI threshold in each time unit in the first time period; according to the RSSI exceeding the RSSI threshold The number of frequency domain units is calculated, the CBR on each time unit is calculated; and the average CBR in the coverage area of the communication device is determined according to the CBR on all time units.

Optionally, the processor 110 is further configured to control the transceiver 120 to periodically obtain the average CBR in its coverage area; and determine the congestion level of each broadcast cycle according to the average CBR; and, in each station The first message is broadcast periodically, and the first message includes configuration parameters or indication information of the configuration parameters used to indicate the congestion level of the period.

For another example, when the communication device has an OBU or a terminal device including an OBU, the transceiver 120 is configured to receive a first message broadcast by the first roadside unit RSU, and the first message includes the configuration parameter or the terminal device. The indication information of the configuration parameter; the processor 110 is configured to determine the configuration parameter according to the first message; and, perform service transmission according to the configuration parameter.

In addition, the processor 110 is further configured to determine the configuration parameter according to the indication information and the correspondence between the indication information and the configuration parameter corresponding to the indication information.

For the specific implementation process of the foregoing processor 110, refer to the foregoing embodiment and the description of FIG. 4, FIG. 5A, and FIG. 5B, and details are not described herein again in this embodiment.

In a specific hardware implementation, as shown in FIG. 10, the transceiver 120 may include components such as a receiver 1201, a transmitter 1202, and an antenna 1203, or may also include a transceiver module, such as a Bluetooth module, a baseband module, etc. Modules, radio frequency modules, etc., and can support direct memory access (direct memory access).

The processor 110 is the control center of the communication device, which uses various interfaces and lines to connect the various parts of the entire communication device, runs or executes software programs and/or units stored in the memory 130, and calls data stored in the memory 130 , To perform various functions of the communication device and various functions and/or image processing.

Further, the processor 110 may be composed of an integrated circuit (IC), for example, may be composed of a single packaged IC, or may be composed of multiple packaged ICs with the same function or different functions. For example, the processor may only include a central processing unit (CPU), or it may be a GPU, a digital signal processor (Digital Signal Processor, DSP), and a control chip (such as a baseband chip) in the transceiver. combination. The processor may further include a hardware chip. The hardware chip may be an application specific integrated circuit (ASIC), a programmable logic device (PLD) or a combination thereof. The above-mentioned PLD may be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a general array logic (generic array logic, GAL), or any combination thereof.

The memory 130 may include a volatile memory (volatile memory), such as random access memory (Random Access Memory, RAM), and may also include a non-volatile memory (non-volatile memory), such as flash memory (flash memory), Hard disk (Hard Sisk Drive, HDD) or solid-state hard disk (Solid-State Drive, SSD); the storage may also include a combination of the above types of storage. A program or code may be stored in the memory, and the processor 110 may implement the function of the communication device by executing the program or code.

In the above-mentioned embodiments, all or part of it may be implemented by software, hardware, firmware or any combination thereof. When implemented by software, it may be implemented in the form of a computer program product in whole or in part, which is not limited in this embodiment. For example, the function of the processing unit 801 in the device embodiment shown in FIG. 8 may be implemented by the processor 110, and the function of the sending unit 802 may be implemented by the transceiver 120. For another example, in the aforementioned device embodiment shown in FIG. 9, the functions of the receiving unit 901 and the sending unit 903 may be implemented by the transceiver 120, or implemented by the transceiver 120 controlled by the processor 110; the processing unit 902 requires The realized function may be realized by the processor 110, and the function of the storage unit may be realized by the memory 130.

Optionally, the communication device is a kind of RSU or a kind of terminal equipment, such as an OBU.

This application also provides a computer program product, which includes one or more computer program instructions. When the computer loads and executes the computer program instructions, all or part of the processes or functions described in the foregoing embodiments of the present application are generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.

The computer program instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer program instructions may be transmitted from a network node, computer, server, or data. The center transmits to another site, computer or server through wired or wireless means.

The same or similar parts in the various embodiments in this specification can be referred to each other. In particular, for the embodiments of the image processing device and the communication device, since they are basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the description in the method embodiment.

Those skilled in the art can clearly understand that the technology in the embodiments of the present invention can be implemented by means of software plus a necessary general hardware platform. Based on this understanding, the technical solutions in the embodiments of the present invention can be embodied in the form of software products, which can be stored in a storage medium, such as ROM/RAM. , Magnetic disks, optical disks, etc., including a number of instructions to enable a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments of the present application.

In addition, the terms “first” and “second” in the description and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments described herein can be implemented in a sequence other than the content illustrated or described herein. In addition, the terms "including" and "having" and any variations of them are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those clearly listed. Those steps or units may include other steps or units that are not clearly listed or are inherent to these processes, methods, products, or equipment.

The implementation manners of the application described above do not constitute a limitation on the protection scope of the application.

Claims (20)

1. A message sending method, characterized in that the method includes:

   The roadside unit RSU determines the average channel busy ratio CBR in the coverage area of the RSU in a first time period, where the average CBR is the average value of all CBRs in the first time period, and each CBR is a component In each time unit in the first time period, the number of frequency domain units exceeding the received signal strength indicator RSSI threshold is the percentage of the total number of frequency domain units corresponding to the time unit;

   The RSU determines the first congestion level according to the average CBR and the correspondence between the average CBR and the congestion level;

   Determining, by the RSU, the configuration parameter corresponding to the first congestion level according to the first congestion level;

   The RSU broadcasts a first message, and the first message includes the configuration parameter or the indication information of the configuration parameter, so that all terminal devices in the coverage area of the RSU, after receiving the first message, follow The configuration parameters are used for service transmission.
2. The method according to claim 1, wherein the RSU determining the average CBR in the coverage area of the RSU in a first time period comprises:

   Detecting, by the RSU, the number of frequency domain units whose RSSI exceeds the RSSI threshold on each time unit in the first time period;

   The RSU calculates the CBR on each time unit according to the number of frequency domain units whose RSSI exceeds the RSSI threshold;

   The RSU determines the average CBR in the coverage area of the RSU according to the CBRs on all the time units.
3. The method according to claim 1 or 2, wherein the configuration parameter includes at least one of the following:

   Transmit power, whether to mix automatic repeat request HARQ retransmission, modulation and demodulation set MCS configuration, packet discarding rules, packet sending frequency.
4. The method according to any one of claims 1-3, wherein the method further comprises:

   The RSU periodically obtains the average CBR in the coverage area of the RSU; and determines the congestion level of each broadcast cycle according to the average CBR;

   The RSU broadcasts a first message in each period, and the first message includes a configuration parameter for indicating a congestion level of the period or indication information of the configuration parameter.
5. A message receiving method, characterized in that the method includes:

   The terminal device receives the first message broadcast by the first roadside unit RSU, where the first message includes configuration parameters or indication information of the configuration parameters; the configuration parameters are determined according to the first congestion level, and the first congestion level It is determined by the first RSU in the first time period to determine the average channel busy ratio CBR in its coverage area, where the average CBR is the average value of all CBRs in the first time period, and each CBR is In each time unit constituting the first time period, the number of frequency domain units exceeding the received signal strength indicator RSSI threshold is a percentage of the total number of frequency domain units corresponding to the time unit;

   The terminal device determines configuration parameters according to the first message;

   The terminal device performs service transmission according to the configuration parameter.
6. The method according to claim 5, wherein the configuration parameter includes at least one of the following:

   Transmit power, whether to mix automatic repeat request HARQ retransmission, modulation and demodulation set MCS configuration, packet discarding rules, packet sending frequency.
7. The method according to claim 5 or 6, wherein when the first message includes indication information of the configuration parameter, the terminal device determining the configuration parameter according to the first message includes:

   The terminal device determines the configuration parameter according to the indication information and the correspondence between the indication information and the configuration parameter corresponding to the indication information.
8. The method according to any one of claims 5-7, wherein the method further comprises:

   Acquiring, by the terminal device, a first moment, where the first moment is the moment when the terminal device receives the first message;

   The terminal device determines whether the first message sent by the first RSU at the second time is received within a preset time interval from the first time; the time interval between the second time and the first time Is the broadcast period of the first RSU, and the broadcast period is less than the preset time interval;

   If not, exit the configuration parameters indicated by the first message, and perform service transmission in an autonomous resource allocation manner.
9. The method according to any one of claims 5-8, wherein the method further comprises:

   In the case that the terminal device receives the first message broadcast by the first RSU and simultaneously receives the second message broadcast by the second RSU, the first message is obtained by parsing the first message and the second message The first congestion level of and the second congestion level of the second message;

   Comparing the size of the first congestion level and the second congestion level, and selecting the message with the high congestion level as the target message;

   Perform service transmission according to the configuration parameters indicated by the target message.
10. A message sending device, characterized in that the device is applied to a roadside unit RSU, and includes:

    A processing unit, configured to determine the average channel busy ratio CBR in the coverage area of the RSU in a first time period, where the average CBR is the average value of all CBRs in the first time period, and each CBR is a component In each time unit of the first time period, the number of frequency domain units exceeding the received signal strength indication RSSI threshold is a percentage of the total number of frequency domain units corresponding to the time unit;

    The processing unit is further configured to determine a first congestion level according to the average CBR and the corresponding relationship between the average CBR and the congestion level; determine the configuration parameter corresponding to the first congestion level according to the first congestion level;

    The sending unit is configured to broadcast a first message, and the first message includes the configuration parameter or the indication information of the configuration parameter, so that all terminal devices in the coverage area of the RSU will receive the first message , And perform service transmission according to the configuration parameters.
11. The device according to claim 10, wherein:

    The processing unit is specifically configured to detect the number of frequency domain units whose RSSI exceeds the RSSI threshold in each time unit in the first time period; according to the RSSI exceeding the RSSI threshold The number of frequency domain units is calculated, the CBR on each time unit is calculated; and the average CBR in the coverage area of the RSU is determined according to the CBR on all the time units.
12. The device according to claim 10 or 11, wherein the configuration parameter includes at least one of the following:

    Transmit power, whether to mix automatic repeat request HARQ retransmission, modulation and demodulation set MCS configuration, packet discarding rules, packet sending frequency.
13. The device according to any one of claims 10-12, wherein:

    The processing unit is further configured to periodically obtain the average CBR in the coverage area of the RSU; and determine the congestion level of each broadcast cycle according to the average CBR;

    The sending unit is further configured to broadcast a first message in each period, and the first message includes configuration parameters for indicating the congestion level of the period or indication information of the configuration parameters.
14. A message receiving device, characterized in that the device includes:

    The receiving unit is configured to receive a first message broadcast by the first roadside unit RSU, where the first message includes configuration parameters or indication information of the configuration parameters; the configuration parameters are determined according to the first congestion level, and the first message A congestion level is determined by the first RSU determining the average channel busy ratio CBR in its coverage area during the first time period. The average CBR is the average value of all CBRs in the first time period. The CBR is the percentage of the number of frequency domain units that exceed the received signal strength indicator RSSI threshold in each time unit constituting the first time period to the total number of frequency domain units corresponding to the time unit;

    The processing unit is configured to determine configuration parameters according to the first message, and perform service transmission according to the configuration parameters.
15. The device according to claim 14, wherein the configuration parameter comprises at least one of the following:

    Transmit power, whether to mix automatic repeat request HARQ retransmission, modulation and demodulation set MCS configuration, packet discarding rules, packet sending frequency.
16. The device according to claim 14 or 15, characterized in that:

    The processing unit is specifically configured to, when the indication information of the configuration parameter is included in the first message, according to the indication information and the correspondence between the indication information and the configuration parameter corresponding to the indication information , To determine the configuration parameters.
17. The device according to any one of claims 14-16, wherein:

    The processing unit is further configured to obtain the first moment, and determine whether the first message sent by the first RSU at the second moment is received within a preset time interval from the first moment; the second moment The time interval from the first moment is the broadcast period of the first RSU, and the broadcast period is less than the preset time interval; if not, the configuration parameter indicated by the first message is exited, according to Autonomous resource allocation method for business transmission;

    The first moment is the moment when the terminal device receives the first message.
18. The device according to any one of claims 14-16, wherein:

    The receiving unit is further configured to receive the second message broadcast by the second RSU while receiving the first message broadcast by the first RSU;

    The processing unit is further configured to parse the first message and the second message to obtain the first congestion level of the first message and the second congestion level of the second message; compare the first congestion level And the size of the second congestion level, selecting the message with the high congestion level as the target message; and performing service transmission according to the configuration parameters indicated by the target message.
19. A communication device includes a processor, the processor is coupled with a memory, and is characterized in that:

    The memory is used to store instructions;

    The processor is configured to execute instructions in the memory, so that the communication device executes the method according to any one of claims 1 to 9.
20. A computer-readable storage medium having instructions stored in the storage medium, characterized in that:

    When the instructions are executed, the method according to any one of claims 1 to 9 is realized.

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