CN111132085A

CN111132085A - Data transmission method, base station and vehicle-mounted terminal

Info

Publication number: CN111132085A
Application number: CN201911419309.3A
Authority: CN
Inventors: 邱佳慧; 张香云; 蔡超
Original assignee: China United Network Communications Group Co Ltd
Current assignee: China United Network Communications Group Co Ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-05-08
Anticipated expiration: 2039-12-31
Also published as: CN111132085B

Abstract

The invention provides a data transmission method, a base station and a vehicle-mounted terminal, relates to the technical field of communication, and solves the problem that channel resources and network resources occupy larger space when shared information is transmitted between vehicles by adopting a V2V communication technology in the prior art. The method comprises the steps that a base station determines that a first vehicle-mounted terminal is a cluster head; the first vehicle-mounted terminal is located in the coverage range of the base station; the base station determines that the second vehicle-mounted terminal and the first vehicle-mounted terminal belong to the same cluster; the second vehicle-mounted terminal is located in the coverage range of the first vehicle-mounted terminal; the base station sends first information to a first vehicle-mounted terminal and sends second information to a second vehicle-mounted terminal; the first information is used for indicating that the first vehicle-mounted terminal is a cluster head, and the second information is used for indicating that the second vehicle-mounted terminal sends shared information to the first vehicle-mounted terminal; and the base station receives the fusion information sent by the first vehicle-mounted terminal and sends the fusion information.

Description

Data transmission method, base station and vehicle-mounted terminal

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a data transmission method, a base station, and a vehicle-mounted terminal.

Background

At present, a vehicle can acquire shared information such as the speed, the driving direction, the position information, whether an emergency brake is stepped on and the like of other vehicles in time through a vehicle-to-vehicle (V2V) communication technology, so that a driver is assisted to better sense traffic conditions outside a sight distance, a pre-judgment is made in advance on dangerous conditions, and corresponding avoidance measures are taken.

As shown in fig. 1, in a scenario where shared information is mutually communicated between vehicles by using a V2V communication technology, each of the vehicle 1, the vehicle 2, the vehicle 3, the vehicle 4, the vehicle 5, the vehicle 6, the vehicle 7, and the vehicle 8 establishes a communication connection with a base station. The vehicle 1 can share its own shared information with the

vehicles

2, 3, 4, 5, 6, 7, and 8 through the base station 1.

It can be seen that the base station transmits shared information of a certain vehicle with each vehicle. However, this method occupies a large amount of network resources and channel resources, resulting in a low effective utilization of resources.

Disclosure of Invention

The invention provides a data transmission method, a base station and a vehicle-mounted terminal, which solve the problem that channel resources and network resources occupy larger space when a V2V communication technology is adopted between vehicles to transmit shared information in the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme:

in a first aspect, the present invention provides a data transmission method, where when a base station determines that a first vehicle-mounted terminal in a coverage area is a cluster head, a second vehicle-mounted terminal belonging to the same cluster as the first vehicle-mounted terminal in the coverage area of the first vehicle-mounted terminal is determined. Then, the first vehicle-mounted terminal determines to become a cluster head according to the first information sent by the base station. And the second vehicle-mounted terminal determines to send the shared information to the first vehicle-mounted terminal according to the second information sent by the base station. Then, the base station receives the fusion information obtained by processing the shared information by the first vehicle-mounted terminal, and sends the fusion information. And the byte number of the fusion information is smaller than that of the shared information.

Therefore, in the data transmission method provided by the invention, the base station determines the first vehicle-mounted terminal which becomes the cluster head in the coverage area, and clusters the second vehicle-mounted terminal in the coverage area of the first vehicle-mounted terminal, so as to determine the second vehicle-mounted terminal which belongs to the same cluster as the first vehicle-mounted terminal. The second vehicle-mounted terminal in the same cluster needs to send the shared information to the first vehicle-mounted terminal for processing, and sends the processed fusion information to the base station through the first vehicle-mounted terminal. Therefore, the base station does not need to establish connection with each vehicle-mounted terminal in the coverage area and the base station, but only establishes connection with the cluster head in the coverage area, and therefore occupation of channel resources of the base station is reduced.

Further, when the base station sends the fusion information, because the first vehicle-mounted terminal processes the shared information, the byte number of the processed fusion information is smaller than the byte number of the shared information. Therefore, the problem that channel resources and network resources occupy larger space when the shared information is transmitted between vehicles by adopting a V2V communication technology in the prior art is solved.

In a second aspect, the present invention provides a data transmission method, wherein when a first vehicle-mounted terminal receives first information sent by a base station, the first vehicle-mounted terminal becomes a cluster head according to an indication of the first information. The first vehicle-mounted terminal is located in the coverage range of the base station. Then, the first vehicle-mounted terminal receives the shared information sent by the second vehicle-mounted terminal in the coverage area, processes the shared information and determines the fusion information. And then, the first vehicle-mounted terminal sends the fusion information of which the byte number is smaller than that of the shared information to the base station.

Therefore, according to the data transmission method provided by the invention, when the first vehicle-mounted terminal is located in the coverage area of the base station and receives the first information sent by the base station, the first vehicle-mounted terminal determines to be a cluster head according to the indication of the first information and sends the processed fusion information to the base station; that is, only when the first vehicle-mounted terminal becomes a cluster head, the communication connection with the base station is established, thereby reducing occupation of channel resources of the base station.

Meanwhile, after the first vehicle-mounted terminal becomes a cluster head, the fusion information is obtained after the sharing information sent by the second vehicle-mounted terminal is processed. Because the byte number of the fusion information is less than the byte number of the shared information, compared with the prior art that the base station and each vehicle transmit the shared information of a certain vehicle, the base station can occupy less network resources when transmitting the fusion information. Therefore, the problem that channel resources and network resources occupy larger space when the shared information is transmitted between vehicles by adopting a V2V communication technology in the prior art is solved.

In a third aspect, the present invention provides a data transmission method, when a second vehicle-mounted terminal in a coverage area of a first vehicle-mounted terminal receives second information sent by a base station, sending shared information to the first vehicle-mounted terminal according to the second information.

In combination with the data transmission methods provided by the first aspect and the second aspect, the second vehicle-mounted terminal in the same cluster needs to send the shared information to the first vehicle-mounted terminal for processing, and send the processed fusion information to the base station through the first vehicle-mounted terminal. Therefore, the base station does not need to establish connection with each vehicle-mounted terminal in the coverage area and the base station, but only establishes connection with the cluster head in the coverage area, and therefore occupation of channel resources of the base station is reduced.

In a fourth aspect, the present invention provides a base station, comprising: the device comprises a receiving unit, a processing unit and a sending unit.

Specifically, the processing unit is configured to determine that the first vehicle-mounted terminal is a cluster head. The first vehicle-mounted terminal is located in the coverage range of the base station. The processing unit is further configured to determine that the second vehicle-mounted terminal and the first vehicle-mounted terminal belong to the same cluster. Wherein the second vehicle-mounted terminal is within the coverage of the first vehicle-mounted terminal. The sending unit is used for sending the first information to the first vehicle-mounted terminal determined by the processing unit and sending the second information to the second vehicle-mounted terminal determined by the processing unit. The first information is used for indicating that the first vehicle-mounted terminal is a cluster head, and the second information is used for indicating that the second vehicle-mounted terminal sends the shared information to the first vehicle-mounted terminal. The receiving unit is used for receiving the fusion information sent by the first vehicle-mounted terminal determined by the processing unit. The sending unit is further configured to send the fusion information received by the receiving unit. The fusion information is obtained by processing the shared information by the first vehicle-mounted terminal, and the byte number of the fusion information is smaller than that of the shared information.

In a fifth aspect, the present invention provides a vehicle-mounted terminal, including: the device comprises a receiving unit, a processing unit and a sending unit.

Specifically, the receiving unit is configured to receive first information sent by a base station. The first vehicle-mounted terminal is located in a coverage area of the base station, and the first information is used for indicating that the first vehicle-mounted terminal is a cluster head. The receiving unit is further configured to receive the shared information sent by the second vehicle-mounted terminal. Wherein the second vehicle-mounted terminal is within the coverage of the first vehicle-mounted terminal. The processing unit is configured to process the shared information received by the receiving unit and determine the fusion information. And the byte number of the fusion information is smaller than that of the shared information. The sending unit is configured to send the fusion information processed by the processing unit to the base station.

In a sixth aspect, the present invention provides an in-vehicle terminal, including: a receiving unit and a transmitting unit.

Specifically, the receiving unit is configured to receive second information sent by the base station. The second information is used for indicating the second vehicle-mounted terminal to send the shared information to the first vehicle-mounted terminal, and the second vehicle-mounted terminal is located in the coverage range of the first vehicle-mounted terminal. The sending unit is used for sending the shared information to the first vehicle-mounted terminal according to the second information received by the receiving unit.

In a seventh aspect, the present invention provides a base station, including: communication interface, processor, memory, bus; the memory is used for storing computer execution instructions, and the processor is connected with the memory through a bus. The processor executes the computer executable instructions stored by the memory when the base station is operating to cause the base station to perform the data transmission method as provided in the first aspect above.

In an eighth aspect, the present invention provides a computer-readable storage medium comprising instructions. The instructions, when executed on a computer, cause the computer to perform the data transmission method as provided above in the first aspect.

It should be noted that all or part of the above computer instructions may be stored on the first computer readable storage medium. The first computer readable storage medium may be packaged together with or separately from the processor of the base station, which is not limited in this application.

In a ninth aspect, there is provided a computer program product which, when run on a computer, causes the computer to perform the data transmission method of the first aspect.

In a tenth aspect, the present invention provides a vehicle-mounted terminal, including: communication interface, processor, memory, bus; the memory is used for storing computer execution instructions, and the processor is connected with the memory through a bus. When the in-vehicle terminal is operated, the processor executes the computer execution instructions stored by the memory to cause the in-vehicle terminal to execute the data transmission method as provided in the second aspect above.

In an eleventh aspect, the present invention provides a computer-readable storage medium comprising instructions. When the instructions are run on a computer, the instructions cause the computer to perform the data transmission method as provided in the second aspect above.

It should be noted that all or part of the above computer instructions may be stored on the second computer readable storage medium. The second computer readable storage medium may be packaged with the processor of the vehicle-mounted terminal, or may be packaged separately from the processor of the vehicle-mounted terminal, which is not limited in this application.

In a twelfth aspect, a computer program product is provided, which, when run on a computer, causes the computer to execute the data transmission method according to the second aspect.

In a thirteenth aspect, the present invention provides a vehicle-mounted terminal, including: communication interface, processor, memory, bus; the memory is used for storing computer execution instructions, and the processor is connected with the memory through a bus. When the vehicle-mounted terminal runs, the processor executes the computer execution instructions stored by the memory to enable the vehicle-mounted terminal to execute the data transmission method provided by the third aspect.

In a fourteenth aspect, the present invention provides a computer-readable storage medium comprising instructions. When the instructions are run on a computer, the instructions cause the computer to perform the data transmission method as provided in the third aspect above.

It should be noted that all or part of the above computer instructions may be stored on the third computer readable storage medium. The third computer-readable storage medium may be packaged together with the processor of the vehicle-mounted terminal, or may be packaged separately from the processor of the vehicle-mounted terminal, which is not limited in this application.

A fifteenth aspect provides a computer program product for causing a computer to perform the data transmission method according to the third aspect when the computer program product runs on the computer.

For the description of the fourth, seventh, eighth and ninth aspects of the present invention, reference may be made to the detailed description of the first aspect; in addition, for the beneficial effects described in the fourth aspect, the seventh aspect, the eighth aspect and the ninth aspect, reference may be made to the beneficial effect analysis of the first aspect, and details are not repeated here.

Reference may be made to the detailed description of the second aspect for the description of the fifth, tenth, eleventh and twelfth aspects of the invention; in addition, for the beneficial effects described in the fifth aspect, the tenth aspect, the eleventh aspect and the twelfth aspect, reference may be made to the beneficial effect analysis of the second aspect, and details are not repeated here.

Reference may be made to the detailed description of the second aspect for the description of the sixth, thirteenth, fourteenth and fifteenth aspects of the invention; in addition, for the beneficial effects described in the sixth aspect, the thirteenth aspect, the fourteenth aspect and the fifteenth aspect, reference may be made to beneficial effect analysis of the third aspect, and details are not repeated here.

In the present application, the names of the base stations or the vehicle-mounted terminals do not limit the devices or the functional modules, and in practical implementation, the devices or the functional modules may be presented by other names. Insofar as the functions of the respective devices or functional blocks are similar to those of the present invention, they are within the scope of the claims of the present invention and their equivalents.

These and other aspects of the invention will be more readily apparent from the following description.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of a prior art network system for V2V communication between vehicles;

fig. 2 is a network architecture diagram of a data transmission method according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a network system for performing V2V communication between vehicles according to a data transmission method provided by an embodiment of the present invention;

fig. 4 is a flowchart illustrating a data transmission method according to an embodiment of the present invention;

fig. 5 is a schematic diagram of an included angle between a vehicle-mounted terminal and a ground plane in a data transmission method according to an embodiment of the present invention;

FIG. 6 is a schematic diagram illustrating the establishment of a geodetic coordinate system in a data transmission method according to an embodiment of the present invention;

fig. 7 is a second flowchart of a data transmission method according to an embodiment of the present invention;

fig. 8 is a third schematic flowchart of a data transmission method according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a base station according to an embodiment of the present invention;

fig. 10 is a second schematic structural diagram of a base station according to an embodiment of the present invention;

fig. 11 is a schematic structural diagram of a vehicle-mounted terminal according to an embodiment of the present invention;

fig. 12 is a second schematic structural diagram of a vehicle-mounted terminal according to an embodiment of the present invention.

Detailed Description

Embodiments of the present invention will be described below with reference to the accompanying drawings.

To facilitate understanding by those skilled in the art, the embodiments of the present application are described herein in connection with the following background:

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

For the convenience of clearly describing the technical solutions of the embodiments of the present application, in the embodiments of the present application, the terms "first" and "second" are used to distinguish the same items or similar items with basically the same functions and actions, and those skilled in the art can understand that the terms "first" and "second" are not limited to numbers and execution orders.

The data transmission method provided by the embodiment of the invention is applied to a V2X architecture based on a PC5 and an LTE-Uu interface as shown in fig. 2, and comprises the following steps: vehicle wireless communication technology (V2X) devices (e.g., V2X device a and V2X device B, V2X device (e.g., V2X device C) for representing pedestrians, V2X device (e.g., V2X device D) for representing drive test units, UMTS evolved terrestrial radio access network (E-UTRAN), mobile management node function (MME), Home Subscriber Server (HSS), Serving Gateway (SGW), public data network gateway (PGW), and V2X application server for representing vehicle terminals, wherein the following new functions and partial interfaces are defined:

V2X Control Function: this logic function is used for the response that V2X requires the network to make.

V1: V2X applies to the reference point between V2X servers.

V2: reference point between V2X application server and V2X control function within operator network, where V2X application server may be connected with V2X control function within multiple PLMN network.

V3: the reference point between the V2X capable User Equipment (UE) and the V2X control function in the operator network needs to be established based on service authorization and PC3 configuration, and can be applied to V2X based on PC5 and V2X based on Uu port.

V4: the reference point between the HSS and the V2X control functions within the operator network.

V5: reference point between V2X applications.

LTE-Uu: reference point between V2X-capable UE and E-UTRAN.

PC 5: reference points between V2X-capable UEs supporting V2V, V2I, and V2P traffic.

In the embodiment of the present invention, the base station may be a base station (BTS) in a global system for mobile communications (GSM), a Code Division Multiple Access (CDMA), a base station (node B, NB) in a Wideband Code Division Multiple Access (WCDMA), a base station (evolved dnb, eNB) in a Long Term Evolution (Long Term Evolution, LTE), an internet of things (internet of things, IoT) or a narrowband internet of things (eNB-IoT), a base station in a future 5G mobile communication network or a future evolved public land mobile network (public land mobile network, PLMN), which is not limited in any way by the embodiment of the present invention.

The base station in the embodiment of the present invention may be the E-UTRAN shown in fig. 2, or may be a part of the apparatus in the E-UTRAN. Such as the chip system in E-UTRAN. The chip system is arranged to support the E-UTRAN to implement the functions referred to in the first aspect and any one of its possible implementations. For example, when it is determined that a first vehicle-mounted terminal in the coverage area is a cluster head, clustering a second vehicle-mounted terminal in a second coverage area of the first vehicle-mounted terminal, and determining a first cluster. And sending the first information to a first vehicle-mounted terminal, and sending the second information to a second vehicle-mounted terminal in the first cluster. And receiving the fusion information sent by the first vehicle-mounted terminal and receiving the fusion information sent by the cluster head of the second cluster. The chip system includes a chip and may also include other discrete devices or circuit structures.

The in-vehicle terminal in the embodiment of the present invention may be a V2X device a or a V2X device B shown in fig. 2, or may be a part of a V2X device a or a V2X device B. Such as a system-on-chip in V2X device a or V2X device B. The system on chip is used to support the V2X device a or the V2X device B to implement the functions referred to in the second aspect and any one of its possible implementations. For example, the first information transmitted by the base station is received, the shared information transmitted by the second vehicle-mounted terminal in the first cluster is received, the shared information is processed, and the processed fusion information is transmitted to the base station. The chip system includes a chip and may also include other discrete devices or circuit structures.

The following description will be made with reference to fig. 2, taking a scene in which a vehicle mounted with the in-vehicle terminal provided by the present invention travels on an expressway as an example as shown in fig. 3:

the E-UTRAN is a base station in the embodiment of the present invention, and the V2X device a or the V2X device B is a vehicle-mounted terminal installed in any one of the

vehicles

1, 2, 3, 4, 5, 6, 7, and 8 in the embodiment of the present invention, each vehicle-mounted terminal corresponds to a vehicle one by one, and a communication module is disposed in the vehicle-mounted terminal, so that when the vehicle-mounted terminal communicates with the base station, a connection can be established with the base station through the communication module; for example, the vehicle-mounted terminal may be provided with a Subscriber Identity Module (SIM), and the data transmission method provided in the embodiment of the present invention is described by taking an example in which the SIM is connected to a base station.

As shown in fig. 4, the data transmission method includes the following steps S11-S14:

s11, the base station 1 determines that the first vehicle-mounted terminal is a cluster head. Wherein the first vehicle-mounted terminal is in the coverage area of the base station 1.

Specifically, the cluster head is configured to process shared information sent by a second vehicle-mounted terminal belonging to the same cluster as the cluster head, and determine fusion information.

Illustratively, referring to fig. 3, the coverage area of the base station 1 is 1-1, the coverage area of the vehicle 1 is a-1 (the corresponding coverage radius is a-1-1), and the base station 1 determines the relative distance between the vehicle 1 and each of the vehicle 2, the vehicle 3, the vehicle 4, the vehicle 5, the vehicle 6, the vehicle 7, and the vehicle 8 according to the position information of the vehicle 1 and the position information of the vehicle 2, the vehicle 3, the vehicle 4, the vehicle 5, the vehicle 6, the vehicle 7, and the vehicle 8. Then, based on the coverage radius a-1-1 of the vehicle 1 and the relative distance of the vehicle 1 to each of the

vehicles

2, 3, 4, 5, 6, 7, and 8, it is determined that the vehicles within the coverage range of the vehicle 1 are the vehicles 2, 3, 4, and 5 (the relative distances of the

vehicles

2, 3, 4, and 5 to the vehicle 1 are all less than or equal to the coverage radius a-1-1).

Further, the base station 1 needs to determine a cluster head according to the weight value of each vehicle-mounted terminal, and perform clustering on the vehicle-mounted terminals, and the specific implementation process is as follows:

the base station 1 determines an average relative speed according to the first formula, the position information of the first vehicle-mounted terminal and the signal receiving power. Wherein the first formula is:

wherein M (a) represents an average relative speed of the vehicle a and other surrounding vehicles, M (N, 1) represents a relative speed of the vehicle N, N represents a total number of vehicles included in the second coverage range, I_newIndicating the distance, I, between the first vehicle-mounted terminal and the base station 1 at the current moment_oldIndicating the distance of the first vehicle-mounted terminal from the base station 1 at the last moment, α_newThe included angle between the connecting line of the first vehicle-mounted terminal and the top end of the base station 1 and the ground plane (as shown in FIG. 5) at the current moment is shown in α_oldThe included angle between the connection line between the first vehicle-mounted terminal and the top end of the base station 1 and the ground plane at the previous moment is shown (as shown in fig. 5), Δ t represents the time difference between the current moment and the previous moment, and P is₀Representing the signal transmission power, P, of the base station 1_aIndicating the signal reception power of the first vehicle-mounted terminal, G₀Representing the signal gain, G, of the transmitting antenna of the base station 1_aDenotes a signal gain of a receiving antenna of the first in-vehicle terminal, λ denotes a signal wavelength of a carrier signal transmitted by the base station 1, N ∈ N, and N are both integers greater than 0.

Specifically, a geodetic coordinate system is established by taking the equator of an ellipsoid as a base circle, a starting meridian as a main circle and the earth center as a coordinate origin. As shown in fig. 6, for any point on the ellipsoid, its geodetic coordinates are:

the geodetic longitude L is an included angle between a meridian plane passing through the point P and the initial meridian plane.

The geodetic latitude B is the included angle between the normal PK of the point P and the equatorial plane on the meridian plane of the point P.

The height H of the earth is the distance from any point on the ellipsoid to the ellipsoid along the normal of the ellipsoid.

Exemplarily, referring to fig. 6, taking an example that the position information of the first vehicle-mounted terminal and the position information of the second vehicle-mounted terminal are both expressed by using geodetic coordinates, the base station 1 determines the relative distance according to the position information of the first vehicle-mounted terminal and the position information of the second vehicle-mounted terminal, and includes:

the base station 1 determines the driving distance according to the second formula, the position information of the first vehicle-mounted terminal and the position information of the second vehicle-mounted terminal. Wherein the second formula comprises:

where d (a, b) represents the travel distance between the vehicle a and the vehicle b, and x_aIndicating the geodetic longitude L, y of the vehicle a_aIndicating the geodetic latitude B, z of the vehicle a_aIndicating the ground height H, x of the vehicle a_bIndicating the geodetic longitude L, y of the vehicle b_bIndicating the geodetic latitude B, z of the vehicle B_bIndicating the ground height H of vehicle b.

Specifically, when there are N cars in the coverage area, the relative distance is determined according to a third formula, the travel distance between the vehicle a and each vehicle b in the coverage area: wherein the third formula comprises:

wherein the content of the first and second substances,

representing the relative distance between the vehicle a and N cars in the coverage area, N and N are integers and N belongs to [1, N ∈]。

And the base station 1 determines the weight value of the first vehicle-mounted terminal according to the average relative speed and the relative distance.

Specifically, when constructing the decision matrix W, the decision matrix W needs to be checked for consistency due to the complexity and high subjectivity of the system. The consistency ratio formula is as follows:

wherein, RI is a random consistency index, values are shown in table 1, CI is a consistency index to be calculated, and a calculation formula is:

wherein λ is_maxN represents the matrix order of the decision matrix W, which is the maximum eigenroot of the matrix.

Specifically, when n is 2, the decision matrix W itself has consistency and does not need to be checked, when n is greater than 2, and when CR is less than 0.1, it indicates that the decision matrix W meets the requirement of consistency, otherwise, the decision matrix needs to be readjusted until the requirement of consistency is met.

TABLE 1RI random consistency index

Order of matrix	1	2	3	4	5	6	7	8	9	10
											RI	0	0	0.52	0.90	1.12	1.24	1.32	1.41	1.45	1.49

Specifically, the invention only relates to 2 factors, namely the average speed and the relative distance respectively, namely the matrix order of the decision matrix W to be constructed is 2, and the decision matrix W has consistency per se; therefore, no consistency check is required.

Second, a decision matrix based on the average relative velocity and relative distance.

Specifically, assume that there are p factors, which are: a is₁、……、a_pThe rule for constructing the decision matrix is as follows:

if a_ijRepresenting the ratio of the importance of factors i and j, then

Indicating the importance of factor j compared to factor i.

Two, a_ij＞0。

III, a_ij＝1。

For example, assuming that the current scene where the vehicle 1 is located is an urban road, if the factor i is an average speed and the factor j is a relative distance, according to the above rule and table 2, the decision matrix W is determined as:

TABLE 2 judgment basis for importance of consideration

Dimension	Current scene	Degree of importance
			1	Dense urban area	Considerations i and j are as important
3	Urban area	The former is slightly more important than the considerations i and j
			5	Suburb	The former is clearly important in comparison to considerations i and j
7	Country	The former is important in comparison to factors i and j
			9	Highway with a light-emitting diode	Considering factors i and j, the former is extremely important

Specifically, the current scene where the vehicle 1 is located may be determined by matching the position information of the vehicle 1 with the map information.

Secondly, multiplying each row of elements in the constructed decision matrix W and calculating the p-th square root of the elements to obtain W_i(ii) a Wherein the content of the first and second substances,

in particular, p here is equal to the order of the decision matrix W.

According to W_iDetermining the weight m of each factor_i(ii) a Wherein the content of the first and second substances,

illustratively, when a decision matrix

Then, it can be determined that factor i is 0.75 in weight and factor j is 0.25 in weight.

Finally, according to the weight m of each factor_iDetermining a weight value M according to the average speed and the relative distance; wherein the content of the first and second substances,

specifically, when it is determined that the weight value satisfies the first preset condition, the base station 1 determines that the first vehicle-mounted terminal becomes a cluster head.

Specifically, referring to fig. 3, the base station 1 determines that the vehicles traveling in the same direction in the coverage area include a vehicle 1, a vehicle 2, a vehicle 3, a vehicle 4, a vehicle 6, and a vehicle 7. Then, the base station 1 determines the weight value of each of the vehicle 1, the vehicle 2, the vehicle 3, the vehicle 4, the vehicle 6, and the vehicle 7 according to the example of S11, as shown in table 3. When the weight value M1 of the vehicle 1 is the smallest weight value in table 3, the base station 1 determines that the vehicle 1 is a cluster head.

S12, the base station 1 determines that the second vehicle-mounted terminal and the first vehicle-mounted terminal belong to the same cluster. Wherein the second vehicle-mounted terminal is within the coverage of the first vehicle-mounted terminal.

Specifically, referring to fig. 3, the coverage area of the base station 1 (where the coverage area of the base station 1 is determined by the coverage radius of the base station 1) is 1-1, and the coverage area of the vehicle 1 (where the coverage area of the vehicle 1 is determined by the coverage radius of the in-vehicle terminal provided on the vehicle 1) is a-1; when the base station 1 determines that the vehicle 1 is a cluster head, vehicles (such as the vehicle 1 and the vehicle 5) traveling in opposite directions and vehicles (such as the vehicle 1 and the vehicle 2) traveling in the same direction exist in the second coverage area a-1. Because of the isolation zones that exist during the travel of vehicles traveling in opposite directions, collision events are less likely to occur. Therefore, the base station 1 needs to determine a second vehicle-mounted terminal traveling in the same direction as the first vehicle-mounted terminal within the coverage area of the first vehicle-mounted terminal.

Exemplarily, with reference to the example of S11 and fig. 3, taking as an example that the first vehicle-mounted terminal is provided in the vehicle 1, and the position information of the first vehicle-mounted terminal and the position information of the second vehicle-mounted terminal are both expressed by using geodetic coordinates, the process of determining the vehicle traveling in the same direction as the vehicle 1 within the coverage area of the vehicle 1 is as follows:

the base station 1 determines a moving direction included angle between the vehicle 1 and any vehicle (such as the vehicle 2, the vehicle 3, the vehicle 4 and the vehicle 5) in a coverage area a-1 according to a moving direction included angle calculation formula, the position information of the first vehicle-mounted terminal and the position information of the second vehicle-mounted terminal; the calculation formula of the included angle of the moving direction is as follows:

where θ represents a moving direction angle of the vehicle a and the vehicle b, the vehicle a and the vehicle b are any vehicles within the coverage of the base station 1, and the vehicle a and the vehicle b are different.

The base station 1 determines whether the moving direction angle between the vehicle a and the vehicle b is smaller than a specified angle. And if so, determining that the driving directions of the vehicle a and the vehicle b are consistent. If not, determining that the driving directions of the vehicle a and the vehicle b are different.

Specifically, the specified angle may be set according to the actual situation, for example, the specified angle is 45 °.

Specifically, with reference to the example of S11, after the base station 1 determines that the first vehicle-mounted terminal is a cluster head and the base station 1 determines that the second vehicle-mounted terminal in the same driving direction as the first vehicle-mounted terminal is in the coverage area of the first vehicle-mounted terminal, the base station 1 determines that the second vehicle-mounted terminal and the first vehicle-mounted terminal belong to the same cluster, including:

specifically, when the second vehicle-mounted terminal and the first vehicle-mounted terminal belong to the same cluster, the communication performance of the first vehicle-mounted terminal and the second vehicle-mounted terminal in the cluster is affected by the fact that the cluster is too large or too small.

Illustratively, the minimum member data of each cluster is 2 vehicles, and the maximum member data amount is 15 vehicles.

For example, assuming that the minimum number of members is 2 and the maximum number of members is 4, since the vehicles traveling in the same direction within the coverage area a-1 of the vehicle 1 include the vehicle 2, the vehicle 3, and the vehicle 4, the total number of the on-board terminals including the second on-board terminal within the coverage area of the vehicle 1 is 3. Since the total number of in-vehicle terminals 3 is greater than the minimum number of members 2, and the total number of in-vehicle terminals 3 is less than the maximum number of members 4. Thus, it is determined that the vehicle 1, the vehicle 2, the vehicle 3, and the vehicle 4 belong to the same cluster. Further, the base station 1 updates the information of the non-clustered vehicles traveling in the same direction within the coverage area according to the clustering result, as shown in table 4. Then, the base station 1 continues clustering the non-clustered vehicles traveling in the same direction in the coverage area according to the steps of S11 and S12 until each vehicle corresponds to a cluster, and ends clustering.

Table 3 co-directional driving non-clustered vehicle information in coverage of base station 1

Table 4 co-directional driving non-clustered vehicle information in coverage of base station 1

Cluster head information	Vehicle-mounted terminal identification code	Weighted value
			Vehicle 6	XXXXXX	M6
Vehicle 7	XXXXXX	M7

For example, assuming that the minimum number of members is 2 and the maximum number of members is 2, the vehicles traveling in the same direction within the coverage area a-1 of the vehicle 1 include the vehicle 2, the vehicle 3, and the vehicle 4. That is, the total number of in-vehicle terminals including the second in-vehicle terminal in the coverage area of the vehicle 1 is 3. Since the total number 3 of the vehicle-mounted terminals is larger than the maximum number 2 of the members, and when the carrier signal is transmitted in the air, the shorter the signal transmission distance is, the higher the transmission quality of the carrier signal is. Therefore, when the base station 1 determines that the second vehicle-mounted terminal and the first vehicle-mounted terminal belong to the same cluster, the relative distance determined by the position information of the second vehicle-mounted terminal and the position information of the first vehicle-mounted terminal satisfies the clustering condition.

Specifically, the clustering condition includes that a relative distance determined by the position information of the second vehicle-mounted terminal and the position information of the first vehicle-mounted terminal is smaller than a coverage radius of the vehicle-mounted terminal.

Specifically, referring to fig. 3, as shown in table 5, the coverage radius of the vehicle-mounted terminal is a-1-1, that is, the optimal transmission distance for transmitting the carrier signal is a-1-1. If the vehicle 1 is a cluster head and the total number of terminals is greater than the maximum number of members, the vehicle 1, the vehicle 2 and the vehicle 3 are in the same cluster because the relative distance D1-2 between the vehicle 1 and the vehicle 2 and the relative distance D1-3 between the vehicle 1 and the vehicle 3 are both less than a-1-1. Since the relative distance D1-4 of vehicle 1 from vehicle 4 is greater than a-1-1, vehicle 4 is not clustered. Further, the base station 1 updates the information of the non-clustered vehicles traveling in the same direction within the coverage area according to the clustering result, as shown in table 6. Then, the base station 1 continues clustering the non-clustered vehicles traveling in the same direction in the coverage area according to the steps of S11 and S12 until each vehicle corresponds to a cluster, and ends clustering.

TABLE 5 Co-directional driving non-clustered vehicle information within coverage of base station 1

Table 6 co-directional driving non-clustered vehicle information in coverage of base station 1

It should be noted that, when the base station 1 monitors that a new vehicle enters the coverage area or the vehicle exits the coverage area of the base station 1, the base station 1 needs to cluster the vehicles in the coverage area again. Wherein each vehicle corresponds to a vehicle-mounted terminal equipment code. Illustratively, the vehicle-mounted terminal identification code may be product codes of the vehicle-mounted terminal, and each product code corresponds to one vehicle-mounted terminal; alternatively, the in-vehicle terminal identifier is an International Mobile Equipment Identity (IMEI) of a SIM card installed in the in-vehicle terminal.

S13, the base station 1 sends the first information to the first vehicle-mounted terminal, and sends the second information to the second vehicle-mounted terminal. The first information is used for indicating that the first vehicle-mounted terminal is a cluster head, and the second information is used for indicating that the second vehicle-mounted terminal sends the shared information to the first vehicle-mounted terminal.

S14, the base station 1 receives the fusion information sent by the first vehicle-mounted terminal and sends the fusion information. The fusion information is obtained by processing the shared information by the first vehicle-mounted terminal, and the byte number of the fusion information is smaller than that of the shared information.

Specifically, since the cluster members do not need to establish communication connection with the base station 1, the base station 1 further needs to receive the fusion information sent by the cluster heads of other clusters, and send the fusion information sent by the cluster heads of other clusters to the first vehicle-mounted terminal, so that a driver of a second vehicle-mounted terminal belonging to the same cluster as the first vehicle-mounted terminal can know the driving state of a vehicle in front, and an accident can be avoided in time according to the driving state of the vehicle in front.

Further, in the embodiment of the present application, in combination with fig. 4, as shown in fig. 7, S11 described above may include S110, S111, and S112.

Further, in the embodiment of the present application, in combination with fig. 4, as shown in fig. 7, S111 may include S1110, S1111, and S1112.

Further, in the embodiment of the present application, in combination with fig. 4, as shown in fig. 7, S12 described above may include S120, S121, S122, and S123.

In the data transmission method provided by the invention, the base station does not need to establish connection with each vehicle-mounted terminal in the coverage area and the base station, but only establishes connection with the cluster head in the coverage area, thereby reducing the occupation of channel resources of the base station. Further, when the base station sends the fusion information, because the first vehicle-mounted terminal processes the shared information, the byte number of the processed fusion information is smaller than the byte number of the shared information. Therefore, the problem that channel resources and network resources occupy larger space when the shared information is transmitted between vehicles by adopting a V2V communication technology in the prior art is solved.

The data transmission method provided by the embodiment of the present invention is described below with reference to the network architecture shown in fig. 2, taking the vehicle-mounted terminal as the V2X device a as an example.

As shown in fig. 4, the data transmission method includes the following steps S21-S24:

s21, the first vehicle-mounted terminal receives the first information sent by the base station 1. The first vehicle-mounted terminal is located in a coverage area of the base station 1, and the first information is used for indicating that the first vehicle-mounted terminal is a cluster head.

And S22, the first vehicle-mounted terminal receives the shared information sent by the second vehicle-mounted terminal. Wherein the second vehicle-mounted terminal is within the coverage of the first vehicle-mounted terminal.

S23, the first vehicle-mounted terminal processes the shared information and determines the fusion information. And the byte number of the fusion information is smaller than that of the shared information.

Specifically, when a cluster member (a second vehicle-mounted terminal belonging to the same cluster as the first vehicle-mounted terminal also becomes a cluster member) transmits a message to the cluster head, the cluster head performs simple data fusion first because the shared messages sent by each cluster member are repeated. The content of the data packet transmission can be classified into the following cases: data packets for transmitting words, data packets for transmitting characters, and data packets for transmitting numerical values.

1. When the data packet of the shared information comprises the text information and/or the character information, the vehicles in the same cluster have the same content of the data packet of the shared information transmitted by a plurality of vehicles due to similar geographic environments, and only one data packet of the shared information needs to be transmitted at the moment. That is, when the shared information includes text information and/or character information, the first vehicle-mounted terminal needs to perform deduplication processing on the text information and/or the character information to determine the fusion information.

2. If the data packets of the shared information include numerical information, because the data packets of the shared information transmitted by vehicles in the same cluster have great similarity, a great amount of similar data needs to be removed, and only one data of the same kind is reserved and then forwarded. At this time, the base station 1 calculates the data packet of the shared information to be forwarded by using Takagi-Sugeno (T-S) fuzzy model fusion. When the data packet of the shared information includes numerical information, the first vehicle-mounted terminal needs to process the numerical information according to the T-S fuzzy model to determine the fusion information. Wherein, the T-S fuzzy model comprises:

u₁+u₂+.....+u_m-1+u_m＝1；

wherein y represents fusion information, x_iNumerical information u representing the ith second vehicle-mounted terminal_iThe weight value of numerical value information sent by the ith second vehicle-mounted terminal is represented, m represents the total number of the second vehicle-mounted terminals receiving the second information in the coverage range of the first vehicle-mounted terminal, a represents the center of the membership function, b represents the width of the membership function, m and i are integers larger than 0, and i belongs to [1, m]。

Specifically, the processing the shared information according to the T-S model includes:

(1) if a cluster has m nodes, for each type of data to be fused:

y＝f(x₁,x₂,......,x_m)。

(2) the contribution of each datum is represented by a weighting coefficient:

y＝u₁×x₁+.....+u_m×x_m；

u₁₊u₂+.....+u_m-1+u_m＝1。

(3) and obtaining a weighting coefficient by adopting a normal membership function:

(4) the fused information is:

illustratively, in conjunction with fig. 3, the base station 1 determines that the vehicle 6 is a cluster head, and the base station 1 determines that the vehicle 6 and the vehicle 7 belong to the same cluster. After the vehicle 7 transmits the shared information to the vehicle 6, the vehicle 6 processes the shared information, and then transmits the fusion information obtained by the processing to the base station 1.

The base station 1 transmits the fusion information transmitted by the vehicle 6 to other clustered cluster heads, such as the vehicle 1. After the vehicle 1 receives the fusion information, the fusion information needs to be sent to the vehicles 2, 3 and 4 belonging to the same cluster as the vehicle 1, so that the drivers of the vehicles 2, 3 and 4 can timely know the running states of the vehicles in other clusters.

Specifically, the vehicles in each cluster transmit the shared information to the cluster heads of each cluster by using a V2V communication technology. And the cluster head transmits the received fusion information to each cluster member belonging to the same cluster as the cluster head by adopting a V2V communication technology mode.

Specifically, the shared message sent by the vehicle-mounted terminal is divided into a periodic message and a burst message. Wherein, the size of the data packet of the periodic message is 50-300bytes, and the size of the data packet of the burst message is 1200 bytes. Based on this, when configuring the resource pool, the base station 1 allocates the resource pool into resource sets of different sizes, wherein the minimum is 100 Resource Blocks (RBs) and the maximum is 300 RBs. The base station 1 selects resource sets with corresponding sizes according to the number of cluster members of each cluster, and resource waste is reduced. The frequency band of the resource pool in the LTE-V2X D2D mode in the 3GPP standard is 5905-5925MHZ, which is 20M bandwidth frequency resource. When configuring the resource pool, some field descriptions are pre-configured, such as: numSubchannel (number of subchannels), subchannel (size of subchannel), and the like. A specification of the size and corresponding number of one resource set may be added to the empty field to indicate the condition of the partitioned resource set of this resource pool.

Specifically, in the process that the vehicle-mounted terminal transmits the shared information or the fusion information by using the V2V communication technology, the vehicle-mounted terminal needs to select an idle time-frequency resource for transmitting the shared information or the fusion information in a sensing manner before transmitting the shared information or the fusion information. This approach may cause resource selection conflicts when two or more vehicles simultaneously select a certain time-frequency resource. According to the invention, the time-frequency resources are uniformly managed through the cluster heads, when the cluster members need to send the shared information or the fusion information, the application of the time-frequency resources is carried out on the cluster heads, and the cluster heads distribute the idle time-frequency resources to the cluster members, so that the conflict of resource selection is avoided.

And S24, the first vehicle-mounted terminal sends the fusion information to the base station 1.

Specifically, since the cluster member does not need to establish a communication connection with the base station 1, when the cluster head receives the fusion information (the fusion information is sent to the base station by other clusters) sent by the base station 1, the cluster head needs to send the fusion information to the second vehicle-mounted terminal belonging to the same cluster as the cluster head, so that a driver of a vehicle equipped with the second vehicle-mounted terminal can know the driving state of a vehicle in front, and an accident can be avoided in time according to the driving state of the vehicle in front.

Further, in the embodiment of the present application, in combination with fig. 4, as shown in fig. 8, S23 described above may include S230 and S231.

According to the data transmission method provided by the invention, when the first vehicle-mounted terminal is positioned in the coverage range of the base station and receives first information sent by the base station, the first vehicle-mounted terminal determines to be a cluster head according to the indication of the first information and sends processed fusion information to the base station; that is, only when the first vehicle-mounted terminal becomes a cluster head, the communication connection with the base station is established, thereby reducing occupation of channel resources of the base station. Meanwhile, after the first vehicle-mounted terminal becomes a cluster head, the fusion information is obtained after the sharing information sent by the second vehicle-mounted terminal is processed. Because the byte number of the fusion information is less than the byte number of the shared information, compared with the prior art that the base station and each vehicle transmit the shared information of a certain vehicle, the base station can occupy less network resources when transmitting the fusion information. Therefore, the problem that channel resources and network resources occupy larger space when the shared information is transmitted between vehicles by adopting a V2V communication technology in the prior art is solved.

As shown in fig. 4, the data transmission method includes the following contents of steps S31 and S32:

s31, the second in-vehicle terminal receives the second information transmitted by the base station 1. The second information is used for indicating the second vehicle-mounted terminal to send the shared information to the first vehicle-mounted terminal, and the second vehicle-mounted terminal is located in the coverage range of the first vehicle-mounted terminal.

And S32, the second vehicle-mounted terminal sends the shared information to the first vehicle-mounted terminal according to the second information.

Specifically, when the base station determines that the vehicle-mounted terminal in the coverage area is not a cluster head, the vehicle-mounted terminal may determine the cluster head to which the vehicle-mounted terminal belongs in the clustering process of the base station. Therefore, the base station notifies the second in-vehicle terminal through the second information.

The scheme provided by the embodiment of the application is mainly introduced from the perspective of a method. To implement the above functions, it includes hardware structures and/or software modules for performing the respective functions. Those of skill in the art would readily appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

In the embodiment of the present application, the base station may be divided into the functional modules according to the above method example, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It should be noted that, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and there may be another division manner in actual implementation.

Fig. 9 is a schematic structural diagram of a base station 10 according to an embodiment of the present application. The base station 10 is configured to determine, when determining that a first vehicle-mounted terminal in a coverage area is a cluster head, a second vehicle-mounted terminal that belongs to the same cluster as the first vehicle-mounted terminal in the coverage area of the first vehicle-mounted terminal. Then, the first vehicle-mounted terminal determines to become a cluster head according to the first information sent by the base station. And the second vehicle-mounted terminal determines to send the shared information to the first vehicle-mounted terminal according to the second information sent by the base station. Then, the base station receives the fusion information obtained by processing the shared information by the first vehicle-mounted terminal, and sends the fusion information. The base station 10 may comprise a receiving unit 101, a processing unit 102 and a transmitting unit 103.

The receiving unit 101 is configured to obtain location information and signal receiving power of the first vehicle-mounted terminal, location information of the second vehicle-mounted terminal, receive the fusion information sent by the first vehicle-mounted terminal, and receive the fusion information sent by the base station. For example, in connection with fig. 4, the receiving unit 101 may be configured to perform S14. In conjunction with fig. 7, the receiving unit 101 may be configured to perform S110.

The processing unit 102 is configured to determine that the first vehicle-mounted terminal becomes a cluster head, and determine that the second vehicle-mounted terminal and the first vehicle-mounted terminal belong to the same cluster. For example, in conjunction with FIG. 4, processing unit 102 may be configured to perform S11 and S12. In connection with fig. 7, the processing unit 102 may be configured to perform S1110, S1111, S1112, S112, S120, S121, S122, and S123.

A sending unit 103, configured to send the first information to the first vehicle-mounted terminal, send the second information to the second vehicle-mounted terminal, send the fusion information to other clustered cluster heads, and send the fusion information of other clustered cluster heads to the base station to the first vehicle-mounted terminal. In connection with fig. 4, the transmitting unit 103 may be configured to perform S13 and S14.

All relevant contents of each step related to the above method embodiment may be referred to the functional description of the corresponding functional module, and the function thereof is not described herein again.

Of course, the base station 10 provided in the embodiment of the present invention includes, but is not limited to, the above modules, for example, the base station 10 may further include the storage unit 104. The storage unit 104 may be used for storing program codes of the base station 10, and may also be used for storing data generated by the base station 10 during operation, such as data in a write request.

Fig. 10 is a schematic structural diagram of a base station 10 according to an embodiment of the present invention, and as shown in fig. 10, the base station 10 may include: at least one processor 51, a memory 52, a communication interface 53 and a communication bus 54.

The following describes each component of the base station in detail with reference to fig. 10:

the processor 51 is a control center of the base station, and may be a single processor or a collective term for multiple processing elements. For example, the processor 51 is a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits configured to implement embodiments of the present invention, such as: one or more DSPs, or one or more Field Programmable Gate Arrays (FPGAs).

In particular implementations, processor 51 may include one or more CPUs such as CPU0 and CPU1 shown in fig. 10, for example, as one embodiment. Also, for one embodiment, the base station may include multiple processors, such as processor 51 and processor 55 shown in FIG. 10. Each of these processors may be a Single-core processor (Single-CPU) or a Multi-core processor (Multi-CPU). A processor herein may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).

The Memory 52 may be a Read-Only Memory (ROM) or other type of static storage device that can store static information and instructions, a Random Access Memory (RAM) or other type of dynamic storage device that can store information and instructions, an electrically erasable Programmable Read-Only Memory (EEPROM), a Compact Disc Read-Only Memory (CD-ROM) or other optical Disc storage, optical Disc storage (including Compact Disc, laser Disc, optical Disc, digital versatile Disc, blu-ray Disc, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to such. The memory 52 may be self-contained and coupled to the processor 51 via a communication bus 54. The memory 52 may also be integrated with the processor 51.

In a particular implementation, the memory 52 is used for storing data and software programs for implementing the present invention. The processor 51 may perform various functions of the air conditioner by running or executing software programs stored in the memory 52 and calling data stored in the memory 52.

The communication interface 53 is a device such as any transceiver, and is used for communicating with other devices or communication Networks, such as a Radio Access Network (RAN), a Wireless Local Area Network (WLAN), a terminal, and a cloud. The communication interface 53 may include a receiving unit implementing a receiving function and a transmitting unit implementing a transmitting function.

The communication bus 54 may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (Extended Industry Standard Architecture) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 10, but this is not intended to represent only one bus or type of bus.

As an example, in conjunction with fig. 9, the receiving unit 101 and the transmitting unit 103 in the base station 10 implement the same functions as the communication interface 53 in fig. 10, the processing unit 102 implements the same functions as the processor 51 in fig. 10, and the storage unit 104 implements the same functions as the memory 52 in fig. 10.

Fig. 11 is a schematic structural diagram of an in-vehicle terminal 20 according to an embodiment of the present disclosure. The in-vehicle terminal 20 is configured to receive the first information sent by the base station, receive the shared information sent by the second in-vehicle terminal, process the shared information, and send the processed fusion information to the base station. The in-vehicle terminal 20 may include a receiving unit 201, a processing unit 202, and a transmitting unit 203.

Or, the vehicle-mounted terminal 20 is configured to receive the second information sent by the base station, and send the shared information to the first vehicle-mounted terminal according to the second information.

The receiving unit 201 is configured to receive the first information sent by the base station 1, receive the shared information sent by the second vehicle-mounted terminal, receive the convergence information sent by the base station (the convergence information is sent to the base station by another cluster), and receive the second information sent by the base station 1. For example, in conjunction with fig. 4, the receiving unit 201 may be configured to perform S21, S22, and S31.

And a processing unit 202, configured to process the shared information. For example, in connection with FIG. 4, processing unit 202 may be used to execute 23. In connection with fig. 8, processing unit 202 may be configured to perform S230 and S231.

A sending unit 203, configured to send the processed fusion information to the base station, send the fusion information (the fusion information is received by the receiving unit 201 from the base station) to a second vehicle-mounted terminal belonging to the same cluster as the cluster head, and send the shared information to the first vehicle-mounted terminal according to the second information. In connection with fig. 4, the transmitting unit 203 may be configured to perform S24 and S32.

Of course, the vehicle-mounted terminal 20 provided by the embodiment of the present invention includes, but is not limited to, the above modules, for example, the vehicle-mounted terminal 20 may further include the storage unit 204. The storage unit 204 may be used for storing program codes of the in-vehicle terminal 20, and may also be used for storing data generated by the in-vehicle terminal 20 during operation, such as data in a write request.

Fig. 12 is a schematic structural diagram of a vehicle-mounted terminal 20 according to an embodiment of the present invention, and as shown in fig. 12, the vehicle-mounted terminal 20 may include: at least one processor 61, a memory 62, a communication interface 63, and a communication bus 64.

The following specifically describes each constituent element of the in-vehicle terminal with reference to fig. 12:

the processor 61 is a control center of the in-vehicle terminal, and may be a single processor or a collective term for a plurality of processing elements. For example, the processor 61 is a Central Processing Unit (CPU), or may be an Application Specific Integrated Circuit (ASIC), or may be one or more Integrated circuits configured to implement embodiments of the present invention, such as: one or more DSPs, or one or more Field Programmable Gate Arrays (FPGAs).

In particular implementations, processor 61 may include one or more CPUs such as CPU0 and CPU1 shown in fig. 12 as one example. Also, as an embodiment, the in-vehicle terminal may include a plurality of processors, such as the processor 61 and the processor 65 shown in fig. 12. Each of these processors may be a Single-core processor (Single-CPU) or a Multi-core processor (Multi-CPU). A processor herein may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).

The Memory 62 may be a Read-Only Memory (ROM) or other type of static storage device that can store static information and instructions, a Random Access Memory (RAM) or other type of dynamic storage device that can store information and instructions, an electrically erasable Programmable Read-Only Memory (EEPROM), a Compact Disc Read-Only Memory (CD-ROM) or other optical Disc storage, optical Disc storage (including Compact Disc, laser Disc, optical Disc, digital versatile Disc, blu-ray Disc, etc.), a magnetic Disc storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to such. The memory 62 may be self-contained and coupled to the processor 61 via a communication bus 64. The memory 62 may also be integrated with the processor 61.

In a particular implementation, the memory 62 is used to store data and software programs that implement the present invention. The processor 61 may perform various functions of the air conditioner by running or executing software programs stored in the memory 62 and calling data stored in the memory 62.

The communication interface 63 is a device such as any transceiver, and is used for communicating with other devices or communication Networks, such as a Radio Access Network (RAN), a Wireless Local Area Network (WLAN), a terminal, and a cloud. The communication interface 63 may include a receiving unit implementing a receiving function and a transmitting unit implementing a transmitting function.

The communication bus 64 may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (Extended Industry Standard Architecture) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 12, but this is not intended to represent only one bus or type of bus.

As an example, in connection with fig. 11, the receiving unit 201 and the transmitting unit 203 in the in-vehicle terminal 20 implement the same functions as the communication interface 63 in fig. 12, the processing unit 202 implements the same functions as the processor 61 in fig. 12, and the storage unit 204 implements the same functions as the memory 62 in fig. 12.

Through the above description of the embodiments, it is clear to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional modules is merely used as an example, and in practical applications, the above function distribution may be completed by different functional modules according to needs, that is, the internal structure of the device may be divided into different functional modules to complete all or part of the above described functions.

In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described device embodiments are merely illustrative, and for example, the division of the modules or units is only one logical functional division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another device, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may be one physical unit or a plurality of physical units, that is, may be located in one place, or may be distributed in a plurality of different places. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a readable storage medium. Based on such understanding, the technical solution of the embodiments of the present invention may be essentially or partially contributed to by the prior art, or all or part of the technical solution may be embodied in the form of a software product, where the software product is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, or the like) or a processor (processor) to execute all or part of the steps of the data transmission method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.

The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions within the technical scope of the present invention are intended to be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A method of data transmission, comprising:

the base station determines that the first vehicle-mounted terminal is a cluster head; the first vehicle-mounted terminal is located in the coverage range of the base station;

the base station determines that a second vehicle-mounted terminal and the first vehicle-mounted terminal belong to the same cluster; wherein the second vehicle-mounted terminal is within a coverage area of the first vehicle-mounted terminal;

the base station sends first information to the first vehicle-mounted terminal and sends second information to the second vehicle-mounted terminal; the first information is used for indicating that the first vehicle-mounted terminal is a cluster head, and the second information is used for indicating that the second vehicle-mounted terminal sends shared information to the first vehicle-mounted terminal;

the base station receives the fusion information sent by the first vehicle-mounted terminal and sends the fusion information; the fusion information is obtained by processing the shared information by the first vehicle-mounted terminal, and the byte number of the fusion information is smaller than that of the shared information.

2. The data transmission method of claim 1, wherein the determining, by the base station, that the first vehicle-mounted terminal becomes a cluster head comprises:

the base station acquires the position information and the signal receiving power of the first vehicle-mounted terminal and the position information of the second vehicle-mounted terminal;

the base station determines a weight value of the first vehicle-mounted terminal according to the position information and the signal receiving power of the first vehicle-mounted terminal and the position information of the second vehicle-mounted terminal;

and when the base station determines that the weight value meets a preset condition, determining that the first vehicle-mounted terminal is a cluster head.

3. The data transmission method according to claim 2, wherein the determining, by the base station, the weight value of the first vehicle-mounted terminal according to the position information and the signal reception power of the first vehicle-mounted terminal and the position information of the second vehicle-mounted terminal comprises:

the base station determines an average relative speed according to the position information and the signal receiving power of the first vehicle-mounted terminal;

the base station determines a relative distance according to the position information of the first vehicle-mounted terminal and the position information of the second vehicle-mounted terminal;

and the base station determines the weight value of the first vehicle-mounted terminal according to the average relative speed and the relative distance.

4. The data transmission method according to any one of claims 1 to 3, wherein the determining, by the base station, that the second vehicle-mounted terminal and the first vehicle-mounted terminal belong to the same cluster includes:

the base station determines that the total number of the vehicle-mounted terminals is greater than or equal to the minimum member number, and determines that the second vehicle-mounted terminal and the first vehicle-mounted terminal belong to the same cluster when the total number of the vehicle-mounted terminals is less than or equal to the maximum member number; the total number of the vehicle-mounted terminals is the total number of the second vehicle-mounted terminals in the coverage range of the first vehicle-mounted terminal.

5. The data transmission method according to any one of claims 1 to 3, wherein the determining, by the base station, that the second vehicle-mounted terminal and the first vehicle-mounted terminal belong to the same cluster includes:

when the base station determines that the total number of the vehicle-mounted terminals is larger than the maximum member number, the position information of the first vehicle-mounted terminal and the position information of a second vehicle-mounted terminal in the coverage range of the first vehicle-mounted terminal are obtained; the total number of the vehicle-mounted terminals is the total number of second vehicle-mounted terminals in the coverage range of the first vehicle-mounted terminal;

the base station determines a relative distance according to the position information of the first vehicle-mounted terminal and the position information of a second vehicle-mounted terminal in the coverage area of the first vehicle-mounted terminal;

the base station determines that a second vehicle-mounted terminal and the first vehicle-mounted terminal belong to the same cluster; and the relative distance determined by the position information of the second vehicle-mounted terminal and the position information of the first vehicle-mounted terminal meets the clustering condition.

6. A method of data transmission, comprising:

the method comprises the steps that a first vehicle-mounted terminal receives first information sent by a base station; the first vehicle-mounted terminal is located within a coverage range of the base station, and the first information is used for indicating that the first vehicle-mounted terminal is a cluster head;

the first vehicle-mounted terminal receives shared information sent by a second vehicle-mounted terminal; wherein the second vehicle-mounted terminal is within a coverage area of the first vehicle-mounted terminal;

the first vehicle-mounted terminal processes the shared information to determine fusion information; wherein the byte number of the fusion information is smaller than the byte number of the shared information;

and the first vehicle-mounted terminal sends the fusion information to the base station.

7. The data transmission method according to claim 6, wherein the shared information includes at least one of literal information and character information;

the first vehicle-mounted terminal processes the shared information and determines fusion information, and the fusion information comprises the following steps:

and the first vehicle-mounted terminal performs duplication elimination processing on the character information and/or the character information to determine fusion information.

8. The data transmission method of claim 6, wherein the shared information comprises digital information;

the first vehicle-mounted terminal processes the numerical information according to the T-S fuzzy model to determine fusion information; wherein the T-S fuzzy model comprises:

u₁+u₂+.....+u_m-1+u_m＝1；

9. A method of data transmission, comprising:

the second vehicle-mounted terminal receives second information sent by the base station; the second information is used for indicating the second vehicle-mounted terminal to send shared information to the first vehicle-mounted terminal, and the second vehicle-mounted terminal is located in the coverage range of the first vehicle-mounted terminal;

and the second vehicle-mounted terminal sends the shared information to the first vehicle-mounted terminal according to the second information.

10. A base station, comprising:

the processing unit is used for determining that the first vehicle-mounted terminal is a cluster head; the first vehicle-mounted terminal is located in the coverage range of the base station;

the processing unit is further configured to determine that a second vehicle-mounted terminal and the first vehicle-mounted terminal belong to the same cluster; wherein the second vehicle-mounted terminal is within a coverage area of the first vehicle-mounted terminal;

a sending unit, configured to send first information to the first vehicle-mounted terminal determined by the processing unit, and send second information to the second vehicle-mounted terminal determined by the processing unit; the first information is used for indicating that the first vehicle-mounted terminal is a cluster head, and the second information is used for indicating that the second vehicle-mounted terminal sends shared information to the first vehicle-mounted terminal;

the receiving unit is used for receiving the fusion information sent by the first vehicle-mounted terminal determined by the processing unit;

the sending unit is further configured to send the fusion information received by the receiving unit; the fusion information is obtained by processing the shared information by the first vehicle-mounted terminal, and the byte number of the fusion information is smaller than that of the shared information.

11. The vehicle-mounted terminal is characterized in that the vehicle-mounted terminal is a first vehicle-mounted terminal, and the first vehicle-mounted terminal comprises:

the receiving unit is used for receiving first information sent by a base station; the first vehicle-mounted terminal is located within a coverage range of the base station, and the first information is used for indicating that the first vehicle-mounted terminal is a cluster head;

the receiving unit is further configured to receive shared information sent by a second vehicle-mounted terminal; wherein the second vehicle-mounted terminal is within a coverage area of the first vehicle-mounted terminal;

the processing unit is used for processing the shared information received by the receiving unit and determining fusion information; wherein the byte number of the fusion information is smaller than the byte number of the shared information;

and the sending unit is used for sending the fusion information obtained by the processing unit to the base station.

12. A vehicle-mounted terminal, characterized in that the vehicle-mounted terminal is a second vehicle-mounted terminal, the second vehicle-mounted terminal comprising:

the receiving unit is used for receiving second information sent by the base station; the second information is used for indicating the second vehicle-mounted terminal to send shared information to the first vehicle-mounted terminal, and the second vehicle-mounted terminal is located in the coverage range of the first vehicle-mounted terminal;

and the sending unit is used for sending the shared information to the first vehicle-mounted terminal according to the second information received by the receiving unit.

13. A computer-readable storage medium comprising instructions which, when executed on a computer, cause the computer to perform the data transmission method of any one of claims 1 to 5.

14. A base station, comprising: communication interface, processor, memory, bus; the memory is used for storing computer execution instructions, and the processor is connected with the memory through a bus;

the processor executes computer-executable instructions stored in the memory to cause the base station to perform the data transmission method of any one of claims 1 to 5 when the base station is operating.

15. A computer-readable storage medium comprising instructions which, when executed on a computer, cause the computer to perform the data transmission method of any one of claims 6 to 8.

16. A vehicle-mounted terminal characterized by comprising: communication interface, processor, memory, bus; the memory is used for storing computer execution instructions, and the processor is connected with the memory through a bus;

when the vehicle-mounted terminal runs, the processor executes the computer execution instructions stored in the memory so as to enable the vehicle-mounted terminal to execute the data transmission method according to any one of the claims 6-8.

17. A computer-readable storage medium comprising instructions which, when run on a computer, cause the computer to perform the data transmission method of claim 9.

18. A vehicle-mounted terminal characterized by comprising: communication interface, processor, memory, bus; the memory is used for storing computer execution instructions, and the processor is connected with the memory through a bus;

when the vehicle-mounted terminal runs, the processor executes the computer execution instructions stored by the memory to cause the vehicle-mounted terminal to execute the data transmission method according to the claim 9.