CN110972104B - V2X communication method and device - Google Patents
V2X communication method and device Download PDFInfo
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- CN110972104B CN110972104B CN201811144434.3A CN201811144434A CN110972104B CN 110972104 B CN110972104 B CN 110972104B CN 201811144434 A CN201811144434 A CN 201811144434A CN 110972104 B CN110972104 B CN 110972104B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
Abstract
A V2X communication method and device, the V2X communication method comprising: receiving a V2X communication request sent by a terminal on a first frequency, wherein the V2X communication request is a request for V2X communication on a second frequency, and the second frequency is different from the first frequency; receiving a measurement report sent by the terminal; and if the measurement report shows that the terminal does not detect any cell on the second frequency and does not detect the synchronization information sent by other terminals on the second frequency, indicating the synchronization information of the adjacent cell on the second frequency to the terminal. The terminal may set the synchronization time of the terminal according to the synchronization information of the neighboring cell, so that the V2X communication quality of the terminal may be improved.
Description
Technical Field
The invention relates to the field of mobile communication, in particular to a V2X communication method and device.
Background
A direct communication mechanism is introduced in a Long Term Evolution (LTE) standard, that is, two terminals may communicate directly without a base station. The related standards also support Vehicle-to-event (V2X) based on direct communication, i.e., a certain terminal can transmit V2X messages directly to other terminals.
Currently, the third Generation Partnership Project (3 GPP) is investigating the introduction of V2X in the 5G New air interface (New Radio, NR). The 5G system can provide larger bandwidth and lower time delay, so that the service requirement of V2X can be better met.
The NR base station is only deployed in a hot spot area in the initial stage of 5G, and wide area coverage cannot be achieved on a certain frequency, so when a terminal expects to perform V2X on the frequency, if the terminal cannot detect any cell and cannot detect synchronization information sent by other terminals, the terminal autonomously sets the synchronization time of the terminal by using preconfigured parameters, and if the synchronization time is not properly set, the other terminals on the frequency may not correctly receive the V2X message of the terminal.
Therefore, a method that can improve the communication quality of V2X is required.
Disclosure of Invention
The embodiment of the invention provides a V2X communication method, which comprises the following steps: receiving a V2X communication request sent by a terminal on a first frequency, wherein the V2X communication request is a request for V2X communication on a second frequency, and the second frequency is different from the first frequency; receiving a measurement report sent by the terminal; and if the measurement report shows that the terminal does not detect any cell on the second frequency and does not detect the synchronization information sent by other terminals on the second frequency, indicating the synchronization information of the adjacent cell on the second frequency to the terminal.
Optionally, the synchronization information sent by the other terminal on the second frequency includes: and synchronizing information of the cell where the other terminal is located on the second frequency.
Optionally, the method further comprises: before receiving a V2X communication request sent by the terminal, configuring a Signaling Radio Bearer 3 (SRB 3) for the terminal to perform Signaling interaction with the terminal.
Optionally, the method further comprises: and after receiving the V2X communication request sent by the terminal, configuring the measurement configuration parameters on the second frequency for the terminal.
Optionally, the method further comprises: receiving a configuration request of a V2X time domain interval sent by the terminal, wherein the configuration request comprises configuration request parameters of a V2X time domain interval on the second frequency; and configuring configuration parameters of the V2X time domain interval for the terminal so that the terminal determines to carry out the V2X communication time domain interval.
Optionally, the configuration request parameter of the V2X time domain interval is determined by a parameter of the terminal performing V2X communication on the second frequency.
Optionally, the terminal is in a dual-connection state, the primary base station is an LTE base station, and the secondary base station is an NR base station; or the main base station is an NR base station, and the auxiliary base station is an LTE base station; or both the main base station and the secondary base station are NR base stations.
The embodiment of the invention provides a V2X communication method, which comprises the following steps: a terminal sends a V2X communication request to a base station on a first frequency, the V2X communication request is a request for V2X communication on a second frequency, the second frequency is different from the first frequency; making a measurement at the second frequency; monitoring the synchronous information of other terminals on the second frequency; transmitting a measurement report to the base station; and receiving synchronization information of the adjacent area on the second frequency from the base station so as to set synchronization time and carry out V2X communication with other terminals.
Optionally, the method further comprises: receiving SRB3 configured by the base station for signaling interaction with the base station before a V2X communication request sent to the base station.
Optionally, the method further comprises: after sending a V2X communication request to the base station, receiving a measurement configuration parameter configured by the base station on the second frequency, and performing measurement on the second frequency according to the measurement configuration parameter.
Optionally, the method further comprises: if cellular communication cannot be simultaneously conducted on the first frequency and V2X communication can be simultaneously conducted on the second frequency, sending a configuration request of a V2X time domain interval to the base station, wherein the configuration request comprises configuration request parameters of a V2X time domain interval; and receiving configuration parameters of a V2X time domain interval configured by the base station to determine a time domain interval for V2X communication on the second frequency.
Optionally, the configuration request parameter of the V2X time domain interval is determined by a parameter of the terminal performing V2X communication on the second frequency.
Optionally, the method further comprises: if at least one cell on the second frequency is detected in the measurement, selecting the cell with the strongest signal and acquiring the V2X communication resource thereof for V2X communication.
Optionally, if the synchronization information of the other terminal on the second frequency is detected in the measurement, the synchronization time of the terminal is set according to the synchronization information of the other terminal.
Optionally, the terminal is in a dual-connection state, the primary base station is an LTE base station, and the secondary base station is an NR base station; or the main base station is an NR base station, and the auxiliary base station is an LTE base station; or both the main base station and the secondary base station are NR base stations.
An embodiment of the present invention provides a V2X communication device, which is applicable to a secondary base station side, and includes: comprising a memory and a processor, said memory having stored thereon a computer program operable on said processor, wherein said processor, when executing said program, performs the steps of the V2X communication method described above.
An embodiment of the present invention provides a V2X communication device, which is suitable for a terminal side, and includes: comprising a memory and a processor, said memory having stored thereon a computer program operable on said processor, wherein said processor, when executing said program, performs the steps of the V2X communication method described above.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following advantages:
in this embodiment of the present invention, if the measurement report shows that the terminal does not detect any cell on the second frequency and does not detect synchronization information sent by other terminals on the second frequency, the base station indicates, to the terminal, synchronization information of a neighboring cell on the second frequency. Therefore, the terminal can set the synchronization time of the terminal according to the synchronization information of the neighboring cell, so that the V2X communication quality of the terminal can be improved.
Further, if a terminal is unable to simultaneously perform cellular communication on the first frequency and V2X communication on the second frequency, the base station configures a time domain interval to the terminal for the terminal to perform V2X communication within the time domain interval, and the base station avoids scheduling the terminal within the time domain interval, thereby further improving the V2X communication quality of the terminal.
Drawings
Fig. 1 is a signaling flow diagram of a V2X communication method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a V2X communication device according to an embodiment of the present invention; and
fig. 3 is a schematic structural diagram of a V2X communication device according to an embodiment of the present invention.
Detailed Description
In the initial stage of 5G, the NR base station is only deployed in a hotspot area, and the LTE base station already implements wide area coverage, so in 5G, the terminal is connected to the NR base station and the LTE base station simultaneously in a Dual Connectivity (E-UTRAN-NR Dual Connectivity, EN-DC) manner.
In an embodiment, the terminal first accesses a serving cell governed by an LTE base station, establishes Radio Resource Control (RRC) connection, and further establishes a data Radio bearer to start a data service. If the terminal has a high-speed data transmission requirement, and the LTE base station obtains that the terminal is simultaneously in the coverage range of a service cell controlled by an NR base station through the measurement of the terminal, the LTE base station negotiates with the NR base station to configure double connection for the terminal, and then sends the radio resource configured for UE by the NR base station to the UE through RRC connection reconfiguration, so that the terminal is accessed to the NR base station and is in a double connection state of LTE and NR. Because the NR base station and the LTE base station belong to different systems. Therefore, when the NR base station is used as a secondary base station, it needs to have a part of control functions, such as signaling that can be generated to configure parameters for the terminal.
When the terminal is in a dual connectivity state, the terminal may need to perform V2X communication on a certain NR frequency, the signaling transmission speed of the NR system is fast, and the communication quality of V2X can be better improved, and a specific V2X communication method is as follows.
Fig. 1 is a signaling flow diagram of a V2X communication method according to an embodiment of the present invention.
In S101, the base station configures SRB3 for the terminal. In this step, the base station is a secondary base station of the terminal in a dual connectivity state. And if the terminal is in an EN-DC state, the base station is an NR base station.
In some embodiments, the base station configures an SRB3 for the terminal so that the base station and the terminal perform signaling interaction, and RRC signaling sent by both sides may be carried by an SRB 3.
In S201, the terminal transmits a V2X communication request to the base station on a first frequency.
In some embodiments, after the terminal receives the SRB3 configured by the base station, a V2X communication request may be sent to the base station on the first frequency through SRB3, and the V2X communication request is a request for V2X communication on the second frequency.
In some embodiments, the first frequency is a frequency of a serving cell governed by a base station, and the second frequency is a target frequency that the terminal desires to perform V2X communication, where the second frequency is different from the first frequency.
In S102, the base station configures measurement configuration parameters on the second frequency for the terminal.
In some embodiments, the terminal may perform measurement on the second frequency by configuring measurement configuration parameters for the terminal, so as to expect to obtain synchronization information of a cell on the second frequency. Wherein the measurement configuration parameters may include: the time window for the terminal to measure, the reporting condition, the neighbor list and the like.
In S202, the terminal performs measurement on the second frequency.
In some embodiments, if the terminal detects an NR cell on the second frequency, and the signal quality of the NR cell exceeds a predetermined threshold, the NR cell acquires a system message configured by the NR cell with respect to V2X, and selects an appropriate resource from a V2X communication resource pool configured by the system message for V2X communication, where the terminal may select a partial resource to transmit a V2X message in an automatic resource selection manner. The system message includes synchronization information of the NR cell, such as system frame number and the like.
In some embodiments, if the terminal detects at least one NR cell on the second frequency, the terminal selects one of the at least one NR cell with the strongest signal strength and acquires its configured V2X communication resources for V2X communication.
In S203, the terminal listens for synchronization information of other terminals on the second frequency.
The terminal may acquire synchronization information by listening to other terminals on the second frequency. Since there may be other terminals also engaged in V2X communication on this frequency, these terminals may be within cell coverage and possibly outside cell coverage. For these terminals, it may become a synchronization source itself, and send synchronization signals to other terminals in the periphery so that other terminals can correctly receive V2X messages. For a terminal which becomes a synchronization source, if the terminal is within the cell coverage range, setting own synchronization time, such as the same system frame number and the same subframe starting position, by using the synchronization information of the cell; and if the terminal is out of the cell coverage range, the terminal sets the synchronization time by itself. The terminal that becomes the synchronization source can indicate whether its synchronization time originates from the serving cell in which it is located in the synchronization signal transmitted by itself. In this embodiment, the synchronization information of the other terminals on the second frequency includes: and the synchronization information of the cell in which the other terminal is located on the second frequency (that is, the synchronization time of the terminal serving as the synchronization source originates from the serving cell in which the terminal is located), where the cell is an NR cell. In some embodiments, the terminal monitors synchronization information of other terminals while performing measurement, and the present solution does not limit the sequence of S202 and S203, that is, can be implemented in parallel.
In some embodiments, if the terminal detects synchronization information of other terminals on the second frequency, the terminal configures a synchronization time of the terminal according to the synchronization information, and then selects an appropriate resource from the preconfigured V2X communication resources for V2X communication. In summary, after the terminal acquires the synchronization information by measuring or monitoring other terminals, V2X communication can be performed.
In S204, the terminal transmits a measurement report to the base station.
In some embodiments, the content of the measurement report comprises: whether the terminal detects an NR cell on the second frequency and whether synchronization information sent by other terminals is detected.
In S103, the base station determines whether the terminal detects synchronization information sent by any cell or other terminal on the second frequency.
In S104, if the measurement report shows that the terminal does not detect any cell on the second frequency and does not detect synchronization information sent by other terminals on the second frequency, the base station indicates the synchronization information of the neighboring cell on the second frequency to the terminal.
In some embodiments, when the terminal does not detect any cell on the second frequency and does not detect synchronization information sent by other terminals on the second frequency, the base station may indicate the synchronization information of the neighboring cell on the second frequency to the terminal through SRB 3. The synchronization information may include a starting position of a system frame number of a neighboring cell, and specifically, may include a system frame number deviation and a subframe deviation between a serving cell governed by the base station and the neighboring cell.
After receiving the neighbor synchronization information sent by the base station, the terminal may set the synchronization time of the terminal for V2X communication according to the neighbor synchronization information, and then select a suitable resource from the preconfigured V2X communication resources to perform V2X communication with other terminals. Compared with the mode of autonomously setting the synchronization time of the terminal by adopting the preconfigured parameters, the method provided by the embodiment of the invention can enable the terminal to obtain the proper synchronization reference, and avoid the situation that other terminals cannot correctly receive the V2X message of the terminal, thereby improving the V2X communication quality of the terminal.
In S205 the terminal determines whether it is capable of simultaneously cellular communication with the base station on the first frequency and V2X communication with other terminals on the second frequency.
In S206, the terminal sends a configuration request of V2X time domain interval to the base station, the configuration request including configuration request parameters of V2X time domain interval.
In some embodiments, after configuring the synchronization time, if the terminal finds that it cannot support cellular communication with the base station on the first frequency and V2X communication with other terminals on the second frequency at the same time, the terminal sends a configuration request for a V2X time domain interval to the base station, the configuration request including configuration request parameters for a V2X time domain interval. The configuration request parameters may include a start position, a duration, and a period of the time domain interval, and the like.
In some embodiments, the configuration request parameters for the V2X time domain interval are determined by parameters of the terminal for V2X communications on the second frequency. The parameters for V2X communication may be provided by NR cells on the second frequency or, when the terminal fails to detect any NR cells on the second frequency, the parameters for V2X communication may be determined according to preconfigured parameters. For terminals capable of V2X communication, V2X communication parameters including transmission resource pool and reception resource pool, etc. applied to outside of network coverage (i.e. no serving cell is detected) are always preconfigured.
It should be noted that the present solution does not limit the execution sequence of S205 and S204; even though the terminal has not transmitted the measurement report to the base station, the terminal may still perform S205 and transmit a configuration request of the V2X time domain interval to the base station.
In S105, the base station sends, to the terminal, a configuration parameter of a V2X time domain interval configured by the base station.
In some embodiments, upon receiving the configuration parameters, the terminal may determine a time domain interval for V2X communication on the second frequency. Therefore, the terminal can perform V2X communication on the second frequency within the time domain interval, perform data and signaling transmission with the base station on the first frequency outside the time domain interval, and the base station avoids scheduling the terminal within the time domain interval, thereby avoiding collision which may occur when performing cellular communication with the base station and further improving V2X communication quality of the terminal. Step S105 may optionally exist, and if the base station does not modify the V2X time domain interval requested by the terminal, this step may be omitted.
In some embodiments, when the terminal is in the dual connectivity state, the primary base station connected to the terminal may be an LTE base station, and the secondary base station may be an NR base station. In some embodiments, the primary base station connected with the terminal may be an NR base station, and the secondary base station may be an LTE base station. In some embodiments, the primary base station and the secondary base station connected to the terminal may both be NR base stations. In the embodiments provided by the present invention, the base stations are all NR base stations.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a V2X communication device according to an embodiment of the present invention, where the device is suitable for a secondary base station side. The device comprises a memory 31 and a processor 32, wherein the memory 31 stores a computer program which can run on the processor 32, the computer program stored on the memory 31 is a program for realizing the steps of the method, and the processor 32 realizes the steps when executing the program. The memory 31 may include: ROM, RAM, magnetic or optical disks, and the like. The steps are referred to above and are not described herein.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a V2X communication device provided in an embodiment of the present invention, where the device is suitable for a terminal side. The device comprises a memory 41 and a processor 42, wherein the memory 41 stores a computer program which can be run on the processor 42, the computer program stored on the memory 41 is a program for realizing the steps of the method, and the processor 42 realizes the steps when executing the program. The memory 41 may include: ROM, RAM, magnetic or optical disks, and the like. The steps are referred to above and are not described herein.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer-readable storage medium, and the storage medium may include: ROM, RAM, magnetic or optical disks, and the like.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (17)
1. A V2X communication method, comprising:
receiving a V2X communication request sent by a terminal on a first frequency, wherein the V2X communication request is a request for V2X communication on a second frequency, and the second frequency is different from the first frequency;
receiving a measurement report sent by the terminal; and
and if the measurement report shows that the terminal does not detect any cell on the second frequency and does not detect the synchronization information sent by other terminals on the second frequency, indicating the synchronization information of the adjacent cell on the second frequency to the terminal.
2. The V2X communication method according to claim 1, wherein the synchronization information transmitted by the other terminals on the second frequency includes: and synchronizing information of the cell where the other terminal is located on the second frequency.
3. The V2X communication method according to claim 1, further comprising: before receiving a V2X communication request sent by the terminal, configuring an SRB3 for the terminal to perform signaling interaction with the terminal.
4. The V2X communication method according to claim 1, further comprising: and after receiving the V2X communication request sent by the terminal, configuring the measurement configuration parameters on the second frequency for the terminal.
5. The V2X communication method according to claim 1, further comprising:
receiving a configuration request of a V2X time domain interval sent by the terminal, wherein the configuration request comprises configuration request parameters of a V2X time domain interval on the second frequency; and
and configuring configuration parameters of the V2X time domain interval for the terminal so that the terminal determines to carry out the V2X communication time domain interval.
6. The V2X communication method according to claim 5, wherein the configuration request parameters for the V2X time domain interval are determined by parameters of the terminal for V2X communication on the second frequency.
7. The V2X communication method according to claim 1, wherein the terminal is in dual connectivity state, the primary base station is an LTE base station, and the secondary base station is an NR base station; or the main base station is an NR base station, and the auxiliary base station is an LTE base station; or both the main base station and the secondary base station are NR base stations.
8. A V2X communication method, comprising:
a terminal sends a V2X communication request to a base station on a first frequency, the V2X communication request is a request for V2X communication on a second frequency, the second frequency is different from the first frequency;
making a measurement at the second frequency;
monitoring the synchronous information of other terminals on the second frequency;
transmitting a measurement report to the base station; and
and receiving the synchronization information of the adjacent area on the second frequency from the base station so as to set the synchronization time and carry out V2X communication with other terminals.
9. The V2X communication method according to claim 8, further comprising: receiving SRB3 configured by the base station for signaling interaction with the base station before a V2X communication request sent to the base station.
10. The V2X communication method according to claim 8, further comprising: after sending a V2X communication request to the base station, receiving a measurement configuration parameter configured by the base station on the second frequency, and performing measurement on the second frequency according to the measurement configuration parameter.
11. The V2X communication method according to claim 8 or 10, further comprising:
if cellular communication cannot be simultaneously conducted on the first frequency and V2X communication can be simultaneously conducted on the second frequency, sending a configuration request of a V2X time domain interval to the base station, wherein the configuration request comprises configuration request parameters of a V2X time domain interval; and
receiving configuration parameters of a V2X time domain interval configured by the base station to determine a time domain interval for V2X communication on the second frequency.
12. The V2X communication method according to claim 11, wherein the configuration request parameters for the V2X time domain interval are determined by parameters of the terminal for V2X communication on the second frequency.
13. The V2X communication method according to claim 8, further comprising: if at least one cell on the second frequency is detected in the measurement, selecting the cell with the strongest signal and acquiring the V2X communication resource thereof for V2X communication.
14. The V2X communication method according to claim 8, wherein if synchronization information of another terminal on the second frequency is detected in the measurement, the synchronization time of the terminal is set according to the synchronization information of the other terminal.
15. The V2X communication method according to claim 8, wherein the terminal is in dual connectivity state, the primary base station is an LTE base station, and the secondary base station is an NR base station; or the main base station is an NR base station, and the auxiliary base station is an LTE base station; or both the main base station and the secondary base station are NR base stations.
16. A V2X communication device, comprising a memory and a processor, the memory having stored thereon a computer program operable on the processor, wherein the processor, when executing the program, performs the steps in the V2X communication method of any one of claims 1 to 7.
17. A V2X communication device, comprising a memory and a processor, the memory having stored thereon a computer program operable on the processor, wherein the processor, when executing the program, performs the steps in the V2X communication method of any one of claims 8 to 15.
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