CN104936260A - Method, device and system for wireless communication between vehicles - Google Patents
Method, device and system for wireless communication between vehicles Download PDFInfo
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- CN104936260A CN104936260A CN201410105542.5A CN201410105542A CN104936260A CN 104936260 A CN104936260 A CN 104936260A CN 201410105542 A CN201410105542 A CN 201410105542A CN 104936260 A CN104936260 A CN 104936260A
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Abstract
The invention provides a method, device and system for wireless communication between vehicles. The method includes: first sending a request message asking for spreading codes used for wireless communication between vehicles to a communication service platform of a network side, the request message including description information of vehicle-mounted devices; then receiving the spreading codes sent by the communication service platform, the spreading codes being allocated for the vehicle-mounted devices by the communication service platform according to the description information of the vehicle-mounted devices in the request message; and finally performing processing of wireless communication between vehicles based on the received spreading codes. The communication service platform can allocate different spreading codes used for wireless communication between vehicles for vehicle-mounted devices of adjacent vehicles, and orthogonal properties of the spreading codes can effectively avoid the problem of conflicts between signals of the vehicle-mounted devices.
Description
Technical field
The present invention relates to data service technical field, particularly relate to the method for radio communication (Vehicle-to-Vehicle, V2V) between a kind of vehicle, Apparatus and system.
Background technology
Existing V2V communication technology scheme mainly adopts Dedicated Short Range Communications, technology (Dedicated Short Range Communications, DSRC) communication technology, main flow be WAVE agreement, physical layer and MAC sublayer (Media Access Control, MAC) adopt IEEE802.11p standard, rely on the direct communication mode interactive information between vehicle and vehicle.
The existing V2V technology physics layer based on WAVE agreement adopts orthogonal frequency division multiplexi (OrthogonalFrequency Division Multiplexing, OFDM), the control message (such as: warning message) of vehicle shares Common transport channel (Common transport Channel, CCH), its frequency is 5.89GHz, csma/conflict is adopted to prevent agreement (Carrier Sense Multiple Access with CollisionAvoidance, CSMA/CA) mechanism from realizing the channel competition of user.
But the defect of prior art is increasing along with mobile unit quantity, in the communication channel competition process of mobile unit, the probability of the communication channel collision of mobile unit can be increased, thus affect success rate and the time delay of the signal transmitting and receiving of mobile unit.
Summary of the invention
In view of the above problems, propose the present invention to provide a kind of method, the Apparatus and system that overcome radio communication between the problems referred to above or the vehicle that solves the problem at least in part, the collision problem between the signal effectively can avoiding mobile unit.
According to one aspect of the present invention, provide the method for radio communication between a kind of vehicle, for mobile unit, described method comprises: the communication services platform to network side sends request the request message of the spreading code for radio communication between vehicle, and described request message comprises the descriptor of described mobile unit; Receive described communication services platform send spreading code, described spreading code by described communication services platform according to the descriptor of the mobile unit in described request message be described mobile unit distribute; The process of radio communication between vehicle is carried out based on the described spreading code received.
Alternatively, before the described communication services platform to network side sends the step of request message for asking spreading code, described method also comprises: the signal strength signal intensity obtaining the pilot signal of multiple base station near described mobile unit; Signal strength signal intensity according to pilot signal chooses resident base station from described neighbouring multiple base station; Set up wireless data with the resident base station chosen to be connected.
Alternatively, the step that the described described spreading code based on receiving carries out the process of radio communication between vehicle comprises:
Receive the broadcasting packet that other mobile units around described mobile unit send, described broadcasting packet comprises spreading code and the information of other mobile units described;
Multiuser Detection is carried out, to cancel the interference between mobile unit according to the spreading code of other mobile units described in the broadcasting packet received;
Dissection process is carried out to the described broadcasting packet received, the information that other mobile units obtaining surrounding send.
Alternatively, the step that the described described spreading code based on receiving carries out the process of radio communication between vehicle comprises:
The message related to calls of the called mobile unit of paging is sent to described communication services platform; Described message related to calls comprises: the identification information of the identification information of base station that described mobile unit connects, the positional information of described mobile unit and called mobile unit;
Receive the positional information of called mobile unit and the spreading code of described called mobile unit of the transmission of described communication services platform;
Set up wireless data according to the information received with described called mobile unit to be connected.
Alternatively, the descriptor of described mobile unit comprises: the time that the identification information of the base station that described mobile unit connects, the positional information of described mobile unit and described mobile unit and described base station connect.
According to another aspect of the present invention, additionally provide the device of radio communication between a kind of vehicle, for mobile unit, described appliance arrangement comprises: radio communication control module between wireless communication module and the vehicle that is connected with wireless communication module between described vehicle between vehicle, wireless communication module between wherein said vehicle, for sending request the request message of the spreading code for radio communication between vehicle to the communication services platform of network side, described request message comprises the descriptor of described mobile unit; And receive described communication services platform send spreading code, described spreading code by described communication services platform according to the descriptor of the mobile unit in described request message be described mobile unit distribute; The described spreading code that between described vehicle, radio communication control module is used for receiving based on wireless communication module between described vehicle carries out the process of radio communication between vehicle.
Alternatively, between described vehicle, radio communication control module is also for obtaining the signal strength signal intensity of the pilot signal of multiple base station near described mobile unit, and from described neighbouring multiple base station, chooses resident base station according to the signal strength signal intensity of pilot signal;
Between described vehicle, wireless communication module is also connected for setting up wireless data with the resident base station chosen.
Alternatively, between described vehicle, wireless communication module is also for the broadcasting packet that other mobile units received around described mobile unit send, and described broadcasting packet comprises spreading code and the information of other mobile units described;
Between described vehicle, radio communication control module is also for carrying out Multiuser Detection according to the spreading code of other mobile units described in the broadcasting packet that receives, to cancel presence of intercell interference, and dissection process is carried out to the described broadcasting packet received, the information that other mobile units obtaining surrounding send.
Alternatively, between described vehicle wireless communication module also for sending the message related to calls of the called mobile unit of paging to described communication services platform; Described message related to calls comprises: the identification information of the identification information of base station that described mobile unit connects, the positional information of described mobile unit and called mobile unit;
Between described vehicle, wireless communication module is also for receiving the positional information of called mobile unit, the spreading code of described called mobile unit that described communication services platform sends;
Between described vehicle, wireless communication module is also connected for setting up wireless data according to the information received with described called mobile unit.
Alternatively, the descriptor of described mobile unit comprises: the time that the identification information of the base station that described mobile unit connects, the positional information of described mobile unit and described mobile unit and described base station connect.
According to another aspect of the present invention, additionally provide the system of radio communication between a kind of vehicle, described system comprises: for distributing the device of radio communication between the communication services platform of spreading code and vehicle as above.
The invention has the beneficial effects as follows: the request message first sending request the spreading code for radio communication between vehicle to the communication services platform of network side; Then the spreading code that described communication services platform sends is received, spreading code by described communication services platform according to the descriptor of the mobile unit in described request message be described mobile unit distribute, finally carry out the process of radio communication between vehicle based on the described spreading code received.Owing to can all be assigned with different spreading codes for the mobile unit of the vehicle closed on, and the orthogonal property of spreading code effectively can avoid mobile unit signal between collision problem.
Accompanying drawing explanation
Fig. 1 represents one of method flow diagram of radio communication between vehicle in embodiments of the invention;
Fig. 2 represents the method flow diagram two of radio communication between vehicle in embodiments of the invention;
Fig. 3 represents the sequential chart that in embodiments of the invention, spreading code distributes;
Fig. 4 represents the method flow diagram three of radio communication between vehicle in embodiments of the invention;
Fig. 5 represents the sequential chart of broadcast communication in embodiments of the invention;
Fig. 6 represents the method flow diagram four of radio communication between vehicle in embodiments of the invention;
Fig. 7 represents the sequential chart of point-to-point communication in embodiments of the invention;
Fig. 8 represents the structured flowchart of the device of radio communication between vehicle in embodiments of the invention; And
Fig. 9 represents the structured flowchart of the system of radio communication between vehicle in embodiments of the invention.
Embodiment
Below with reference to accompanying drawings exemplary embodiment of the present disclosure is described in more detail.Although show exemplary embodiment of the present disclosure in accompanying drawing, however should be appreciated that can realize the disclosure in a variety of manners and not should limit by the embodiment set forth here.On the contrary, provide these embodiments to be in order to more thoroughly the disclosure can be understood, and complete for the scope of the present disclosure can be conveyed to those skilled in the art.
In an embodiment of the present invention, between vehicle, radio communication can adopt CDMA(Code DivisionMultiple Access, code division multiple access) agreement, WCDMA(Wideband Code Division MultipleAccess, Wideband Code Division Multiple Access (WCDMA)) agreement, or TD-SCDMA(Time Division-Synchronous CodeDivision Multiple Access, TD SDMA) agreement.Only adopt CDMA agreement to be introduced for radio communication between vehicle below, and adopt other agreements similar in this, no longer repeat at this.
As shown in Figure 1, for one of the method flow diagram of radio communication between vehicle in embodiments of the invention, for mobile unit, in the method, the executive agent of each step can be mobile unit, or the device for radio communication between vehicle in mobile unit, be certainly also not limited to this.The method comprises:
Step S101, send request the request message of the spreading code for radio communication between vehicle to the communication services platform of network side, this request message comprises the descriptor of mobile unit.
Mobile unit can be in-vehicle navigation apparatus, audio video-apparatus on board or train movement recording equipment etc. in an embodiment of the present invention, it is appreciated of course that, do not limit the particular type of this mobile unit in an embodiment of the present invention.This mobile unit can comprise: radio communication control module between wireless communication module and vehicle between mobile communication module, vehicle.Wherein, mobile communication module can adopt 2G, 3G or 4G technology and base station to set up wireless data to be connected.Between vehicle, wireless communication module can realize the process to base station CDMA pilot signal, also will support radio communication between the vehicle based on CDMA agreement simultaneously.Between vehicle, radio communication control module mainly realizes the control to wireless communication module between mobile communication module, vehicle, obtains spreading code from communication services platform, and calls radio communication function between vehicle for vehicular applications.
In an embodiment of the present invention, communication services platform can distribute spreading code for mobile unit, this spreading code is used for distinguishing a string binary code used for vehicle-carrying equipment in CDMA, spreading code is used for being multiplied with baseband digital signal, after baseband signal spread spectrum, bandwidth increases, and the average power in bandwidth declines.Alternatively, adopt the Walsh code (walsh code) of 64/128 as spreading code.
Step S103, received communication service platform send spreading code, spreading code by communication services platform according to the descriptor of the mobile unit in request message be mobile unit distribute.
Alternatively, the descriptor of mobile unit comprises: the time that the identification information of the base station that mobile unit connects, the positional information of mobile unit and mobile unit and base station connect.
Step S105, carry out the process of radio communication between vehicle based on the described spreading code received.
In an embodiment of the present invention, the sequencing of the time that communication services platform can connect according to mobile unit and base station is followed successively by mobile unit and distributes spreading code from the spread spectrum code character preset, spreading code starts anew again after distributing to distribute spreading code, and between the mobile unit that can ensure proximate vehicle to greatest extent, spreading code is not overlapping.Then, the spreading code of distribution is handed down to corresponding mobile unit by communication services platform can connect according to mobile unit the identification information of base station, the positional information of mobile unit.Because communication services platform can be assigned with different spreading codes for the mobile unit of proximate vehicle, and the orthogonal property of spreading code effectively can avoid the collision problem between subscriber signal, thus increasing because of mobile unit quantity in prior art can be solved, in the communication channel competition process of mobile unit, increase the probability of the communication channel collision of mobile unit, thus affect the success rate of signal transmitting and receiving and the problem of time delay.
As shown in Figure 2, for the method flow diagram two of radio communication between vehicle in embodiments of the invention, and between the vehicle shown in Fig. 1 radio communication method unlike, in Fig. 2, between vehicle, the method for radio communication also comprised the step set up wireless data with base station and be connected before step S101, and concrete steps are as follows:
Step S107, obtain the signal strength signal intensity of the pilot signal of multiple base station near this mobile unit.
Above-mentioned pilot signal in telecommunications network for measuring or the object of monitoring and the signal that sends.This signal is generally single-frequency.
Step S109, from neighbouring multiple base station, choose resident base station according to the signal strength signal intensity of pilot signal.
Step S111, set up wireless data with the resident base station chosen and be connected, then enter step S101.
As shown in Figure 3, be the sequential chart that spreading code of the present invention distributes, comprise the steps:
The signal strength signal intensity of the pilot signal of multiple base station near step S301, acquisition mobile unit;
In an embodiment of the present invention, carrier synchronization and clock synchronous can be realized by pilot channel, realize time synchronized by synchronizing channel.
Step S303, choose resident base station;
Step S305, set up wireless data connect;
Step S307, send request the request message of spreading code to communication services platform;
Step S309, communication services platform are that mobile unit distributes spreading code;
The sequencing of the time that communication services platform can connect according to mobile unit and base station is followed successively by mobile unit and distributes spreading code from the spread spectrum code character preset, spreading code starts anew again after distributing to distribute spreading code, and between the mobile unit that can ensure proximate vehicle to greatest extent, spreading code is not overlapping.
Step S311, communication services platform issue spreading code to mobile unit.
As shown in Figure 4, for the method flow diagram three of radio communication between vehicle in embodiments of the invention, and between the vehicle shown in Fig. 2 radio communication method unlike, the step S105 carrying out the process of radio communication between vehicle based on the spreading code received comprises broadcast communication step, and concrete steps are as follows:
The broadcasting packet that other mobile units around step S1051, reception mobile unit send, this broadcasting packet comprises: the spreading code of these other mobile units and information;
Alternatively, information can be the information such as positional information, warning message from other mobile units.
The spreading code of other mobile units in the broadcasting packet that step S1053, basis receive carries out Multiuser Detection;
Multiuser detection (MUD) improves performance by cancelling presence of intercell interference, increases power system capacity.
Step S1055, dissection process is carried out to the broadcasting packet received, the information that other mobile units obtaining surrounding send.
Alternatively, information can be processed by the vehicular applications module of mobile unit, such as, carry out alarm.
As shown in Figure 5, be the sequential chart of broadcast communication in embodiments of the invention, comprise the steps:
The broadcasting packet of step S501, reception other mobile units transmission around, the spreading code of other mobile units of broadcasting packet bag and information, this information can be the information such as positional information, warning message.
Step S503, Multiuser Detection;
If carry out traversal poll to multi-user, traversal poll amount of calculation can be caused larger, now can separate a timeslice, each timeslice divides 64/128 time slot, each mobile unit is at the spreading code of corresponding time slot broadcast oneself, and such mobile unit just can carry out Multiuser Detection according to the spreading code received.
Step S505, parse the broadcasting packet of mobile unit around;
Step S507, carry out vehicular applications process, such as vehicular applications carries out anticollision early warning according to information.
As shown in Figure 6, for the method flow diagram four of radio communication between vehicle in embodiments of the invention, and between the vehicle shown in Fig. 2 radio communication method unlike, the step S105 carrying out the process of radio communication between vehicle based on the spreading code received comprises the step of point-to-point communication, and concrete steps are as follows:
Step S1057, send the message related to calls of paging called mobile unit to communication services platform; Message related to calls comprises: the identification information of the identification information of base station that mobile unit connects, the positional information of mobile unit and called mobile unit;
The positional information of called mobile unit that step S1059, received communication service platform send and the spreading code of called mobile unit;
The positional information of called mobile unit that step S1061, basis receive is set up wireless data with the spreading code of called mobile unit with called mobile unit and is connected.
As shown in Figure 7, be the sequential chart of point-to-point communication in embodiments of the invention, comprise the steps:
Step S701, caller mobile unit send the beep-page message of the called mobile unit of paging to communication for service platform;
Step S703, communication for service platform judge whether communication can reach called mobile unit; If so, step S705 is entered;
Step S705, caller mobile unit receive the positional information of called mobile unit and the spreading code of called mobile unit of the transmission of communication for service platform;
Alternatively, caller mobile unit receives the positional information of the called mobile unit that communication for service platform sends, the spreading code of called mobile unit and the signal transmission power of suggestion.
Step S707, called mobile unit receive the positional information of caller mobile unit and the spreading code of caller mobile unit of the transmission of communication for service platform;
Alternatively, called mobile unit receives the positional information of the caller mobile unit that communication for service platform sends, the spreading code of caller mobile unit and the signal transmission power of suggestion.
In an embodiment of the present invention, radio communication coverage area between vehicle can be adjusted by the signal transmission power of suggestion, avoid the overlap of spreading code, reduce interference, such as: when vehicle is intensive, can transmitting power be reduced.In point-to-point communication, power controls suitably to improve transmission range, but will avoid the interference that may be formed other vehicles.
Step S709, caller mobile unit are set up wireless data with called mobile unit and are connected.
As shown in Figure 8, be the structured flowchart of the device 800 of radio communication between vehicle in embodiments of the invention, this device 800 comprises: radio communication control module 803 between wireless communication module 801 and the vehicle that is connected with wireless communication module between vehicle 801 between vehicle, wherein
Wireless communication module 801 between vehicle, for sending request the request message of the spreading code for radio communication between vehicle to the communication services platform of network side, described request message comprises the descriptor of described mobile unit; And receive described communication services platform send spreading code, described spreading code by described communication services platform according to the descriptor of the mobile unit in described request message be described mobile unit distribute;
Radio communication control module 803 between vehicle, the described spreading code for receiving based on wireless communication module 801 between described vehicle carries out the process of radio communication between vehicle.
Alternatively, in one embodiment of the invention, between described vehicle, radio communication control module 803 is also for obtaining the signal strength signal intensity of the pilot signal of multiple base station near described mobile unit, and from described neighbouring multiple base station, chooses resident base station according to the signal strength signal intensity of pilot signal; Between vehicle, wireless communication module 801 is also connected for setting up wireless data with the resident base station chosen.
Alternatively, in one embodiment of the invention, between described vehicle, wireless communication module 801 is also for the broadcasting packet that other mobile units received around described mobile unit send, and described broadcasting packet comprises spreading code and the information of other mobile units described;
Between described vehicle, radio communication control module 803 is also for carrying out Multiuser Detection according to the spreading code of other mobile units described in the broadcasting packet that receives; And dissection process is carried out to the described broadcasting packet received, the information that other mobile units obtaining surrounding send.
Alternatively, in one embodiment of the invention, between described vehicle wireless communication module 801 also for sending the message related to calls of the called mobile unit of paging to described communication services platform; Described message related to calls comprises: the identification information of the identification information of base station that described mobile unit connects, the positional information of described mobile unit and called mobile unit; Between described vehicle, wireless communication module 801 is also for receiving the positional information of called mobile unit, the spreading code of described called mobile unit that described communication services platform sends; Between described vehicle, wireless communication module 801 is also connected for setting up wireless data according to the information received with described called mobile unit.
Alternatively, in one embodiment of the invention, the descriptor of described mobile unit comprises: the time that the identification information of the base station that described mobile unit connects, the positional information of described mobile unit and described mobile unit and described base station connect.
Continue see Fig. 8, between this vehicle, the device 800 of radio communication also comprises: mobile communication module 807, GPS module 809 and vehicular applications module 805, and wherein mobile communication module 807 is connected with radio communication control module 803 between vehicle; GPS module 809 is connected with radio communication control module between vehicle, and vehicular applications module 805 is connected with radio communication control module 803 between vehicle, and this vehicular applications module 805 may be used for processing prompt message, such as warning message etc.
Fig. 9 represents the structured flowchart of the system of radio communication between vehicle in embodiments of the invention, and this system comprises: the device 800 of radio communication between communication services platform 901 and vehicle as above.Particularly, between vehicle, the device 800 of radio communication sends request the request message of the spreading code for radio communication between vehicle to the communication services platform 901 of network side by base station 903, and described request message comprises the descriptor of described mobile unit; Between described vehicle radio communication device 800 by base station 903 receive described communication services platform 901 send spreading code, described spreading code by described communication services platform according to the descriptor of the mobile unit in described request message be described mobile unit distribute.And, between two chassis the device 800 of radio communication vehicle between wireless communication module 801 also can carry out based on CDMA workshop radio communication.
Above-described is the preferred embodiment of the present invention; should be understood that the ordinary person for the art; can also make some improvements and modifications not departing under principle prerequisite of the present invention, these improvements and modifications are also in protection scope of the present invention.
Claims (11)
1. the method for radio communication between vehicle, for mobile unit, it is characterized in that, described method comprises:
Communication services platform to network side sends request the request message of the spreading code for radio communication between vehicle, and described request message comprises the descriptor of described mobile unit;
Receive described communication services platform send spreading code, described spreading code by described communication services platform according to the descriptor of the mobile unit in described request message be described mobile unit distribute;
The process of radio communication between vehicle is carried out based on the described spreading code received.
2. the method for claim 1, is characterized in that, before the described communication services platform to network side sends the step of request message for asking spreading code, described method also comprises:
Obtain the signal strength signal intensity of the pilot signal of multiple base station near described mobile unit;
Signal strength signal intensity according to pilot signal chooses resident base station from described neighbouring multiple base station;
Set up wireless data with the resident base station chosen to be connected.
3. the method for claim 1, is characterized in that, the step that the described described spreading code based on receiving carries out the process of radio communication between vehicle comprises:
Receive the broadcasting packet that other mobile units around described mobile unit send, described broadcasting packet comprises spreading code and the information of other mobile units described;
Multiuser Detection is carried out, to cancel the interference between mobile unit according to the spreading code of other mobile units described in the broadcasting packet received;
Dissection process is carried out to the described broadcasting packet received, the information that other mobile units obtaining surrounding send.
4. the method for claim 1, is characterized in that, the step that the described described spreading code based on receiving carries out the process of radio communication between vehicle comprises:
The message related to calls of the called mobile unit of paging is sent to described communication services platform; Described message related to calls comprises: the identification information of the identification information of base station that described mobile unit connects, the positional information of described mobile unit and called mobile unit;
Receive the positional information of called mobile unit and the spreading code of described called mobile unit of the transmission of described communication services platform;
Set up wireless data with the spreading code of described called mobile unit with described called mobile unit according to the positional information of the called mobile unit received to be connected.
5. the method as described in any one of Claims 1 to 4, it is characterized in that, the descriptor of described mobile unit comprises: the time that the identification information of the base station that described mobile unit connects, the positional information of described mobile unit and described mobile unit and described base station connect.
6. the device of radio communication between vehicle, for mobile unit, it is characterized in that, described device comprises: radio communication control module between wireless communication module and the vehicle that is connected with wireless communication module between described vehicle between vehicle, wherein
Wireless communication module between described vehicle, for sending request the request message of the spreading code for radio communication between vehicle to the communication services platform of network side, described request message comprises the descriptor of described mobile unit; And receive described communication services platform send spreading code, described spreading code by described communication services platform according to the descriptor of the mobile unit in described request message be described mobile unit distribute;
The described spreading code that between described vehicle, radio communication control module is used for receiving based on wireless communication module between described vehicle carries out the process of radio communication between vehicle.
7. device as claimed in claim 6, it is characterized in that, between described vehicle, radio communication control module is also for obtaining the signal strength signal intensity of the pilot signal of multiple base station near described mobile unit, and from described neighbouring multiple base station, chooses resident base station according to the signal strength signal intensity of pilot signal;
Between described vehicle, wireless communication module is also connected for setting up wireless data with the resident base station chosen.
8. device as claimed in claim 6, it is characterized in that, between described vehicle, wireless communication module is also for the broadcasting packet that other mobile units received around described mobile unit send, and described broadcasting packet comprises spreading code and the information of other mobile units described;
Between described vehicle, radio communication control module is also for carrying out Multiuser Detection according to the spreading code of other mobile units described in the broadcasting packet that receives, to cancel presence of intercell interference, and dissection process is carried out to the described broadcasting packet received, the information that other mobile units obtaining surrounding send.
9. device as claimed in claim 6, is characterized in that, between described vehicle, wireless communication module is also for sending the message related to calls of the called mobile unit of paging to described communication services platform; Described message related to calls comprises: the identification information of the identification information of base station that described mobile unit connects, the positional information of described mobile unit and called mobile unit;
Between described vehicle, wireless communication module is also for receiving the positional information of called mobile unit, the spreading code of described called mobile unit that described communication services platform sends;
Between described vehicle, wireless communication module is also connected for setting up wireless data according to the information received with described called mobile unit.
10. the device as described in any one of claim 6 ~ 9, it is characterized in that, the descriptor of described mobile unit comprises: the time that the identification information of the base station that described mobile unit connects, the positional information of described mobile unit and described mobile unit and described base station connect.
Between 11. 1 kinds of vehicles, the system of radio communication, is characterized in that, described system comprises: for distributing the device of radio communication between the communication services platform of spreading code and vehicle as described in any one of claim 6 ~ 10.
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| CN201410105542.5A CN104936260A (en) | 2014-03-20 | 2014-03-20 | Method, device and system for wireless communication between vehicles |
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| CN201410105542.5A CN104936260A (en) | 2014-03-20 | 2014-03-20 | Method, device and system for wireless communication between vehicles |
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Application publication date: 20150923 |