Method and system for controlling urban road traffic congestion based on radio positioning

Abstract

The application belongs to the technical field of communication, and proposes a city road traffic congestion control method and system based on radio positioning. The main scheme is as follows: a base station sends a first confirmation instruction to a first communication range at a first communication frequency; a vehicle-mounted navigation software of a vehicle receives the first confirmation instruction, obtains initial congestion information based on the reception information of the first confirmation instruction, and determines whether to establish a self-organizing network according to the initial congestion information; in the self-organizing network, each vehicle receiving the first confirmation instruction is regarded as a basic node, and a center node is selected from the basic nodes; the center node sends a second request instruction to the basic nodes in a second communication range at a second wireless communication frequency; based on the response information of the second request instruction, it is determined whether the lane where the vehicle corresponding to the basic node is located is congested; when it is determined that the lane is congested, the rear vehicle in the same driving direction is sent the lane change suggestion information.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a method and system for controlling urban road traffic congestion based on radio positioning. Background Art

[0002] Due to the development of intelligent vehicles and intelligent road monitoring, vehicle-road coordination is becoming increasingly close, which can greatly alleviate urban road congestion.

[0003] However, current RSUs (Railside Subunits) not only need to interface with traffic signal systems but also require microwave radar, positioning and timing, and edge computing capabilities. This creates a significant data processing challenge for these units. Furthermore, while most vehicles are equipped with in-car navigation software, the software used by different car brands varies. Even within the same car brand, the software is subject to irregular updates, resulting in incomplete version coordination. This ultimately hinders timely synchronization of vehicle-road collaboration, hindering the timely and effective resolution of urban road congestion.

[0004] Due to the rapid development of radio technology in the field of communications, radio positioning technology has become increasingly mature. Therefore, if the data processing volume of roadside units and vehicle-mounted units can be greatly reduced, and there is no need to consider the version issue of on-board navigation software, then the problem of urban road traffic congestion can be effectively alleviated. Summary of the Invention

[0005] The purpose of the present invention is to provide a method and system for controlling urban road traffic congestion based on radio positioning, which can effectively alleviate the problem of urban road traffic congestion without considering the version of the on-board navigation software and without increasing the hardware investment cost of the additional roadside unit, and the data processing volume of the roadside unit and the on-board navigation software is greatly reduced.

[0006] The present invention solves the technical problem and adopts the following technical solution:

[0007] In one aspect, the present invention provides a method for controlling urban road traffic congestion based on radio positioning, comprising the following steps:

[0008] monitoring whether an onboard navigation software of the vehicle is activated, and when the onboard navigation software is activated, sending a first request instruction of a first wireless communication frequency to a roadside unit within a first communication range;

[0009] Determine a roadside unit according to the first request instruction received by each roadside unit, and use it as a base station for establishing an ad hoc network;

[0010] Sending a first confirmation instruction via the base station within the first communication range at the first communication frequency;

[0011] receiving the first confirmation instruction through the vehicle's onboard navigation software, and obtaining initial congestion information based on the reception information of the first confirmation instruction, and determining whether to establish an ad hoc network based on the initial congestion information, and if so, establishing an ad hoc network among all vehicles in the same driving direction and in all lanes that have received the first confirmation instruction within a first communication range from the base station;

[0012] In the ad hoc network, each vehicle that receives the first confirmation instruction is used as a basic node, and a central node is selected from the basic nodes;

[0013] Sending a second request instruction to the infrastructure node within the second communication range via the central node at the second wireless communication frequency;

[0014] Based on the response information of the second request instruction, it is determined whether congestion occurs in the lane where the vehicle corresponding to the basic node is located. When congestion is determined to occur, a lane change suggestion information is sent to the rear vehicle in the same driving direction.

[0015] As a further optimization, determining a roadside unit according to the first request instruction received by each roadside unit and using it as a base station for establishing the ad hoc network means:

[0016] Obtain the number of first request instructions received by each roadside unit within a first preset time period. When the number of first request instructions received reaches the first preset number, screen out the roadside unit that receives the largest number of first request instructions and use it as the base station for forming an ad hoc network.

[0017] As a further optimization, if multiple roadside units are screened out that receive the largest number of first request instructions, the roadside unit whose number of received first request instructions first reaches the first preset instruction number is used as the base station for forming the self-organizing network.

[0018] As a further optimization, obtaining initial congestion information based on the reception information of the first confirmation instruction, and determining whether to establish an ad hoc network according to the initial congestion information, means:

[0019] From the time a first confirmation instruction is sent by the base station at a first communication frequency within a first communication range to a first preset time period thereafter, obtaining a number of first confirmation instructions received by the vehicle's onboard navigation software; when the number of first confirmation instructions reaches a second preset number, the obtained initial congestion situation information is represented as follows: the corresponding lane section within the first communication range from the base station is congested;

[0020] When the corresponding road section within the first communication range from the base station is congested, it is determined to establish an ad hoc network.

[0021] As a further optimization, selecting a central node from the basic nodes means:

[0022] After the self-organizing network is established, the position information of the vehicle receiving the first confirmation instruction in each lane in the same driving direction is obtained through the base station;

[0023] Connect the two base nodes farthest from each other in all lanes with a straight line, and take the base node closest to the midpoint of the straight line as the center node.

[0024] As a further optimization, after the central node sends the second request instruction to the basic node within the second communication range at the second wireless communication frequency, the method further includes:

[0025] A second confirmation instruction returned by each basic node to the central node is obtained within a second preset time period from when the central node issues a second request instruction for the number of basic nodes to when all basic nodes receive the corresponding second request instruction.

[0026] As a further optimization, if within the second preset time period, the number of second confirmation instructions returned by each basic node to the central node reaches a third preset number of instructions, it indicates that congestion occurs in the corresponding lane within the second communication range from the central node.

[0027] As a further optimization, judging whether congestion occurs in the lane where the vehicle corresponding to the basic node is located based on the response information of the second request instruction means:

[0028] The lane where the basic node corresponding to the vehicle that obtains the second confirmation instruction returned to the central node is located is the corresponding lane where congestion occurs within the second communication range from the central node.

[0029] As a further optimization, when congestion is determined to occur, a lane change suggestion information is sent to the following vehicle in the same driving direction, which means:

[0030] After obtaining the corresponding lane where congestion occurs, the base station is notified through the central node, and the base station sends a lane change suggestion information to the rear vehicles in the same driving direction of the lane within the first communication range from the base station.

[0031] On the other hand, the present invention also provides an urban road traffic congestion control system based on radio positioning, which is applied to the urban road traffic congestion control method based on radio positioning, comprising:

[0032] a monitoring unit configured to monitor whether an onboard navigation software of the vehicle is activated, and when the onboard navigation software is activated, send a first request instruction of a first wireless communication frequency to a roadside unit within a first communication range;

[0033] A base station selection unit is configured to determine a roadside unit according to the first request instruction received by each roadside unit, and use it as a base station for forming an ad hoc network;

[0034] A first sending unit, configured to send a first confirmation instruction via a base station within a first communication range at a first communication frequency;

[0035] a first determining unit, configured to receive the first confirmation instruction through an onboard navigation software of the vehicle, obtain initial congestion information based on information about the reception of the first confirmation instruction, and determine whether to establish an ad hoc network based on the initial congestion information, and if so, establish an ad hoc network among vehicles in all lanes in the same driving direction that have received the first confirmation instruction within a first communication range from the base station;

[0036] A node selection unit is configured to, in the ad hoc network, take each vehicle that receives the first confirmation instruction as a basic node and select a central node from the basic nodes;

[0037] A second sending unit is configured to send a second request instruction to a basic node within a second communication range via the central node at a second wireless communication frequency;

[0038] The second judgment unit is used to judge whether congestion occurs in the lane where the vehicle corresponding to the basic node is located based on the response information of the second request instruction, and when congestion is determined to occur, send lane change suggestion information to the rear vehicle in the same driving direction.

[0039] The beneficial effect of the present invention is that: through the above-mentioned urban road traffic congestion control method and system based on radio positioning, there is no need to pay attention to the version issue of the on-board navigation software. It only needs to cooperate with the selected roadside unit as a base station to preliminarily screen out which road sections may be congested, and then use the vehicles that send and receive instructions with the base station at a first communication frequency within a first communication range as basic nodes, and form an ad hoc network. In the ad hoc network, the central node and each basic node communicate with each other at a second communication frequency within a second communication range, and then the ad hoc network can be used to accurately determine which lane is congested.

[0040] Therefore, the present invention not only does not require attention to the version of the on-board navigation software, but also does not require additional hardware investment costs for the roadside unit. It only needs to reuse the roadside unit as a base station, reuse the on-board navigation software as a basic node and a central node, and send and receive instructions within the first communication range and the second communication range respectively at the communication frequency and the second communication frequency to alleviate urban road traffic congestion. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1This is a flow chart of the urban road traffic congestion control method based on radio positioning in Example 1 of the present invention;

[0042] Figure 2 This is a schematic diagram of vehicles in four lanes within the first communication range after a base station is selected in Example 1 of the present invention;

[0043] Figure 3 This is a schematic diagram of selecting a central node in Example 1 of the present invention;

[0044] Figure 4 This is a schematic diagram of the composition structure of the urban road traffic congestion control system based on radio positioning in Example 2 of the present invention.

[0045] Among them, 101 represents a vehicle with the in-vehicle navigation software turned on, and 102 represents a vehicle without the in-vehicle navigation software installed or turned on. DETAILED DESCRIPTION

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0047] Example 1

[0048] This embodiment provides a method for controlling urban road traffic congestion based on radio positioning. Figure 1 , wherein the method comprises the following steps:

[0049] S1. Monitoring whether the vehicle's onboard navigation software is activated. When the onboard navigation software is activated, sending a first request instruction at a first wireless communication frequency to a roadside unit within a first communication range;

[0050] S2. Determine a roadside unit according to the first request instructions received by each roadside unit, and use it as a base station for establishing an ad hoc network;

[0051] S3. Sending a first confirmation instruction at a first communication frequency within a first communication range through the base station;

[0052] S4. Receiving the first confirmation instruction through the vehicle's onboard navigation software, obtaining initial congestion information based on the reception information of the first confirmation instruction, and determining whether to establish an ad hoc network based on the initial congestion information. If so, establishing an ad hoc network among all vehicles in the same driving direction and in all lanes that have received the first confirmation instruction within a first communication range from the base station;

[0053] S5. In the ad hoc network, each vehicle that receives the first confirmation instruction is used as a basic node, and a central node is selected from the basic nodes;

[0054] S6. Sending a second request instruction to the infrastructure node within the second communication range via the central node at the second wireless communication frequency;

[0055] S7. Based on the reception information of the second request instruction, determine whether the lane where the vehicle corresponding to the basic node is located is congested. When it is determined that congestion occurs, send lane change suggestion information to the rear vehicle in the same driving direction.

[0056] In actual application, the roadside units installed on both sides of the road need to be connected to the traffic light control system and need to cooperate with vehicles to realize positioning, timing and edge computing functions. Therefore, if image and video acquisition equipment is used and image and video processing is performed to assist in alleviating urban road traffic congestion, a long delay is required and multiple roadside units need to be used to implement it. In addition, the current car navigation software manufacturers are different and the versions are different. Therefore, the current use of roadside units for image and video processing and notifying the car navigation software of the recommended roads or recommended paths to alleviate road traffic congestion requires more data processing processes and also takes more data processing time. Therefore, this embodiment abandons the traditional solution to alleviate traffic congestion. On the one hand, based on the roadside unit, one is selected as the base station in the roadside unit, and instructions are sent and received with vehicles with on-board navigation turned on within the first communication range from the base station to preliminarily confirm whether the road is congested. On the other hand, based on the vehicles that send and receive instructions with the base station, an ad hoc network is established, and each vehicle is used as a basic node, and a central node is selected. In the ad hoc network, the instructions sent and received between the central node and the basic node are used as a basis for accurately judging the problem of lane-level congestion, and then lane change prompts can be provided for subsequent vehicles within the first communication range.

[0057] See also Figure 2 ,After selecting the base station, a schematic diagram of four lanes of vehicles within the first communication range, taking the four lanes in the same driving direction as an example, there are vehicles 101 with the car navigation software turned on, and vehicles 102 without the car navigation software installed or turned on, through Figure 2 It can be seen that the number of vehicles in each lane cannot be completely balanced. Therefore, after selecting the base station, the base station is used as a benchmark to realize the sending and receiving of the first request instruction and the first confirmation instruction between the base station and the vehicle 101 with the navigation software turned on within the first communication range.

[0058] It should be noted that, in this embodiment, since the first communication range and the first communication frequency can be determined after the base station is selected, whether congestion occurs on the relevant road section within the first communication range can be determined by the number of instructions sent and received between the vehicle 101 with the in-vehicle navigation software turned on and the base station. Moreover, after the vehicle enters the first communication range, if the vehicle passes through the range in a short time, it indicates that no congestion occurs; if the vehicle stays for too long, it indicates that congestion may occur. Therefore, it is necessary to define a first preset time period and a first preset number of instructions as judgment conditions. Therefore, in this embodiment, the determination of a roadside unit based on the first request instruction received by each roadside unit and using it as a base station for forming an ad hoc network can refer to:

[0059] Obtain the number of first request instructions received by each roadside unit within a first preset time period. When the number of first request instructions received reaches the first preset number, screen out the roadside unit that receives the largest number of first request instructions and use it as the base station for forming an ad hoc network.

[0060] Generally speaking, since current roadside units are installed relatively closely, it is very likely that multiple roadside units will appear within the first communication range. At this time, how to select a suitable roadside unit from the multiple roadside units and use it as a base station is crucial. Therefore, in this embodiment, if there are multiple roadside units that have received the largest number of first request instructions, the roadside unit whose number of received first request instructions first reaches the first preset instruction number will be used as the base station for forming the self-organizing network.

[0061] It should be pointed out that many vehicles on the road are not equipped with in-vehicle navigation software. Even if some vehicles are equipped with in-vehicle navigation software, the drivers may use mobile terminals for navigation based on navigation habits instead of choosing in-vehicle navigation software for navigation. Therefore, for the vehicle 101 with the in-vehicle navigation software turned on, the instructions sent and received between it and the base station can only preliminarily determine whether congestion occurs on the relevant road section within the first communication range based on the base station. Only when it is determined that the road section may be preliminarily congested will the subsequent self-organizing network establishment process be carried out. Therefore, in this embodiment, the acquisition of initial congestion information based on the reception information of the first confirmation instruction and the determination of whether to establish an ad hoc network based on the initial congestion information may refer to:

[0062] From the time a first confirmation instruction is sent by the base station at a first communication frequency within a first communication range to a first preset time period thereafter, obtaining a number of first confirmation instructions received by the vehicle's onboard navigation software; when the number of first confirmation instructions reaches a second preset number, the obtained initial congestion situation information is represented as follows: the corresponding lane section within the first communication range from the base station is congested;

[0063] When the corresponding road section within the first communication range from the base station is congested, it is determined to establish an ad hoc network.

[0064] See also Figure 3 Regarding the schematic diagram of selecting the central node, since the number of lanes in the first communication range based on the base station varies, and vehicles 101 with in-vehicle navigation software enabled may also be distributed in different lanes, in order to ensure that the central node and other basic nodes can send and receive commands with a lower packet loss rate as much as possible in the ad hoc network to accurately determine the congested lane, in this embodiment, selecting the central node from the basic nodes means:

[0065] After the self-organizing network is established, the position information of the vehicle receiving the first confirmation instruction in each lane in the same driving direction is obtained through the base station;

[0066] Connect the two base nodes farthest from each other in all lanes with a straight line, and take the base node closest to the midpoint of the straight line as the center node.

[0067] Figure 3 In the figure, the two vehicles 101 with the in-car navigation software turned on that are farthest apart in the leftmost lane are the farthest apart. After the midpoint of the straight line is confirmed, the basic node closest to the midpoint of the straight line is the vehicle 101 with the in-car navigation software turned on that is marked in the leftmost lane.

[0068] It should be noted that after the central node is selected, it is necessary to use the central node as a basis and, within the second communication range, use the second communication frequency to send and receive instructions between the central node and other basic nodes to accurately determine which lane is congested. Therefore, it is necessary to set a second preset time to determine the dwell time of the vehicle 101 with the in-vehicle navigation software turned on in each lane, and then accurately determine which lane is congested. Therefore, in this embodiment, after the central node sends the second request instruction to the basic nodes within the second communication range using the second wireless communication frequency, it is also necessary to include:

[0069] A second confirmation instruction returned by each basic node to the central node is obtained within a second preset time period from when the central node issues a second request instruction for the number of basic nodes to when all basic nodes receive the corresponding second request instruction.

[0070] Specifically, since within the second preset time period, if each basic node moves and does not go out of the second communication range, it will inevitably return a second confirmation instruction to the central node. Therefore, the number of received second confirmation instructions is also needed as a judgment condition for whether the lane is congested. At the same time, since the central node may also move within the first communication range based on the base station, then after the second preset time period, if the central node goes out of the first communication range, it is necessary to reconfirm the central node. Therefore, in this embodiment, within the second preset time period, if the number of second confirmation instructions returned by each basic node to the central node reaches the third preset instruction number, it indicates that the corresponding lane within the second communication range from the central node is congested.

[0071] Therefore, in this embodiment, judging whether congestion occurs in the lane where the vehicle corresponding to the basic node is located based on the response information of the second request instruction means: the lane where the vehicle corresponding to the basic node that obtains the second confirmation instruction returned to the central node is located is the corresponding lane that is congested within the second communication range from the central node.

[0072] It should be noted that since subsequent vehicles entering the first communication range based on the base station may also have in-vehicle navigation software activated, after the above-mentioned accurate determination of which lane is more congested is made, lane change prompts can be issued to these subsequent vehicles. Therefore, in this embodiment, when congestion is determined, lane change suggestion information is sent to the following vehicle traveling in the same direction, which means:

[0073] After obtaining the corresponding lane where congestion occurs, the base station is notified through the central node, and the base station sends a lane change suggestion information to the rear vehicles in the same driving direction of the lane within the first communication range from the base station.

[0074] In actual application, even if many vehicles are equipped with on-board navigation software and receive lane change information, due to the driver's driving habits and failure to pay attention to lane change suggestions in a timely manner, they will subsequently maintain the original lane and enter the first communication range based on the base station. Therefore, it can be set to reselect the base station and reconfirm the congested road section and congested lane after every third preset time period.

[0075] Example 2

[0076] Based on Example 1, this embodiment provides a city road traffic congestion control system based on radio positioning. The system composition structure diagram is shown in FIG. Figure 4 , the system comprises:

[0077] a monitoring unit configured to monitor whether an onboard navigation software of the vehicle is activated, and when the onboard navigation software is activated, send a first request instruction of a first wireless communication frequency to a roadside unit within a first communication range;

[0078] A base station selection unit is configured to determine a roadside unit according to the first request instruction received by each roadside unit, and use it as a base station for forming an ad hoc network;

[0079] A first sending unit, configured to send a first confirmation instruction via a base station within a first communication range at a first communication frequency;

[0080] a first determining unit, configured to receive the first confirmation instruction through an onboard navigation software of the vehicle, obtain initial congestion information based on information about the reception of the first confirmation instruction, and determine whether to establish an ad hoc network based on the initial congestion information, and if so, establish an ad hoc network among vehicles in all lanes in the same driving direction that have received the first confirmation instruction within a first communication range from the base station;

[0081] A node selection unit is configured to, in the ad hoc network, take each vehicle that receives the first confirmation instruction as a basic node and select a central node from the basic nodes;

[0082] A second sending unit is configured to send a second request instruction to a basic node within a second communication range via the central node at a second wireless communication frequency;

[0083] The second judgment unit is used to judge whether congestion occurs in the lane where the vehicle corresponding to the basic node is located based on the reception status information of the second request instruction, and when congestion is determined to occur, send lane change suggestion information to the rear vehicle in the same driving direction.

[0084] According to the description of Example 1, the application scenario and implementation principle of this embodiment are consistent with those of Example 1, so they are not repeated here.

[0085] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for controlling urban road traffic congestion based on radio positioning, characterized in that: The steps include: monitoring whether an onboard navigation software of the vehicle is activated, and when the onboard navigation software is activated, sending a first request instruction of a first wireless communication frequency to a roadside unit within a first communication range; Determining a roadside unit based on the first request instructions received by each roadside unit and using it as a base station for establishing the ad hoc network, wherein determining a roadside unit based on the first request instructions received by each roadside unit and using it as a base station for establishing the ad hoc network comprises: obtaining a number of first request instructions received by each roadside unit within a first preset time period, and when the number of first request instructions received reaches a first preset number, screening out a roadside unit that has received the largest number of first request instructions, and using it as a base station for establishing the ad hoc network; Sending a first confirmation instruction via the base station within the first communication range at the first communication frequency; Receiving the first confirmation instruction through the vehicle's on-board navigation software, and obtaining initial congestion information based on the reception information of the first confirmation instruction, and determining whether to establish an ad hoc network based on the initial congestion information, and if so, establishing an ad hoc network between the vehicles that have received the first confirmation instruction in all lanes in the same driving direction within the first communication range from the base station; obtaining the initial congestion information based on the reception information of the first confirmation instruction, and determining whether to establish an ad hoc network based on the initial congestion information, means: from the time when the first confirmation instruction is sent by the base station to the first communication range at the first communication frequency to a first preset time period thereafter, obtaining the number of first confirmation instructions received by the vehicle's on-board navigation software, when the number of first confirmation instructions reaches a second preset number, the obtained initial congestion information indicates that the corresponding lane section within the first communication range from the base station is congested; When the corresponding road section within the first communication range from the base station is congested, determining to establish an ad hoc network; In the ad hoc network, each vehicle that receives the first confirmation instruction is used as a basic node, and a central node is selected from the basic nodes; Sending a second request instruction to the infrastructure node within the second communication range via the central node at the second wireless communication frequency; Based on the response information of the second request instruction, it is determined whether the lane where the vehicle corresponding to the basic node is located is congested. When it is determined that congestion occurs, a lane change suggestion information is sent to the rear vehicle in the same driving direction.

2. The urban road traffic congestion control method based on radio positioning according to claim 1 is characterized in that: If multiple roadside units are screened out that receive the largest number of first request instructions, the roadside unit whose number of received first request instructions reaches the first preset number first is used as the base station for forming the ad hoc network.

3. The urban road traffic congestion control method based on radio positioning according to claim 1, characterized in that: The selection of a central node from the basic nodes refers to: After the self-organizing network is established, the position information of the vehicle receiving the first confirmation instruction in each lane in the same driving direction is obtained through the base station; Connect the two base nodes farthest from each other in all lanes with a straight line, and take the base node closest to the midpoint of the straight line as the center node.

4. The method for controlling urban road traffic congestion based on radio positioning according to claim 1, characterized in that: After sending a second request instruction to a basic node within a second communication range through the central node at a second wireless communication frequency, the method further includes: A second confirmation instruction returned by each basic node to the central node is obtained within a second preset time period from when the central node issues a second request instruction for the number of basic nodes to when all basic nodes receive the corresponding second request instruction.

5. The urban road traffic congestion control method based on radio positioning according to claim 4 is characterized in that: If the number of second confirmation instructions returned by each basic node to the central node reaches a third preset number of instructions within the second preset time period, it indicates that congestion occurs in the corresponding lane within the second communication range from the central node.

6. The urban road traffic congestion control method based on radio positioning according to claim 5, characterized in that: The determining, based on the response information of the second request instruction, whether congestion occurs in the lane where the vehicle corresponding to the basic node is located, means: The lane where the basic node corresponding to the vehicle that obtains the second confirmation instruction returned to the central node is located is the corresponding lane where congestion occurs within the second communication range from the central node.

7. The urban road traffic congestion control method based on radio positioning according to claim 6, characterized in that: When congestion is determined to occur, the lane change suggestion information is sent to the following vehicle in the same driving direction, which means: After obtaining the corresponding lane where congestion occurs, the base station is notified through the central node, and the base station sends a lane change suggestion information to the rear vehicle in the same driving direction of the lane within the first communication range from the base station.

8. An urban road traffic congestion control system based on radio positioning, applied to an urban road traffic congestion control method based on radio positioning according to any one of claims 1 to 7, characterized in that: include: a monitoring unit configured to monitor whether an onboard navigation software of the vehicle is activated, and when the onboard navigation software is activated, send a first request instruction of a first wireless communication frequency to a roadside unit within a first communication range; A base station selection unit is configured to determine a roadside unit according to the first request instruction received by each roadside unit, and use it as a base station for forming an ad hoc network; A first sending unit, configured to send a first confirmation instruction via a base station within a first communication range at a first communication frequency; a first determining unit, configured to receive the first confirmation instruction through an onboard navigation software of the vehicle, obtain initial congestion information based on information about the reception of the first confirmation instruction, and determine whether to establish an ad hoc network based on the initial congestion information, and if so, establish an ad hoc network among vehicles in all lanes in the same driving direction that have received the first confirmation instruction within a first communication range from the base station; A node selection unit is configured to, in the ad hoc network, take each vehicle that receives the first confirmation instruction as a basic node and select a central node from the basic nodes; A second sending unit is configured to send a second request instruction to a basic node within a second communication range via the central node at a second wireless communication frequency; The second judgment unit is used to judge whether congestion occurs in the lane where the vehicle corresponding to the basic node is located based on the response information of the second request instruction, and when congestion is determined to occur, send lane change suggestion information to the rear vehicle in the same driving direction.

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