CN110972316A - Transmission resource scheduling method for V2X terminal - Google Patents
Transmission resource scheduling method for V2X terminal Download PDFInfo
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- CN110972316A CN110972316A CN201811139090.7A CN201811139090A CN110972316A CN 110972316 A CN110972316 A CN 110972316A CN 201811139090 A CN201811139090 A CN 201811139090A CN 110972316 A CN110972316 A CN 110972316A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/14—Reselecting a network or an air interface
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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]
Abstract
The application discloses a transmission resource scheduling method of a V2X terminal, which comprises the following steps: when the mode 3V2X terminal is switched to the 5G network from the LTE network, the switched target base station receives the V2X transmission resource pool configuration of the PC5 interface sent by the source base station directly or through the core network; after the V2X terminal is successfully switched to the 5G network, the target base station receives a sidelink sensing result of the PC5 measured and reported by the V2X terminal; and the target base station allocates scheduling transmission resources for the V2X terminal according to the V2X transmission resource pool configuration and the sidelink sensing result of the PC5 interface. By the application, the service quality of V2X can be improved.
Description
Technical Field
The present application relates to V2X (Vehicle to evolution) technology, and in particular, to a method for scheduling V2X transmission resources.
Background
In an LTE system, data transmission can be performed between V2X terminals using a PC5 interface Sidelink (Sidelink), and an LTE network configures a radio resource pool on a PC5 interface for V2X traffic transmission. For the transmission based on the PC5 interface, there are two resource allocation methods: one is that the LTE base station allocates corresponding radio resources for PC5 transmission scheduling of the connected V2X terminal, which is called Mode 3(Mode 3); another is that the V2X terminal autonomously selects the required time-frequency domain radio resource from the transmission resource pool configured by the network based on the measurement sensing result of the resource pool, which is called Mode 4(Mode 4).
For V2X terminals that use mode 3 for resource allocation on the PC5 interface, the LTE base station uses dci (downlink control information) format 5A to schedule pscch (physical downlink control channel) channel transmission on the PC5 interface. Specifically, DCI format 5A contains the following information:
-carrier indication
-lowest index of subchannel assigned to initial transmission
SCI (Sidelink Control Information) format 1 Information, including:
frequency domain resource location of initial transmission and retransmission
-time interval between initial transmission and retransmission
-secondary link index
-sidelink semi-persistent scheduling configuration index
-activation/release indication
After receiving the DCI format 5A, the V2X terminal in mode 3 transmits SCI format 1 on the configured time-frequency domain resource location using PSCCH for scheduling V2X data transmission on the PSCCH channel.
In addition, the mode 3V2X terminal may perform sensing measurement on the transmission resource pool configured by the network, that is, perform reference signal measurement on sub-channels in the transmission resource pool within a sensing time window configured by the network, and determine whether each sub-channel is occupied according to a threshold configured by the network. The V2X terminal in mode 3 reports the sensing measurement result to the serving base station, so that the base station can schedule transmission resources more effectively and reduce the occurrence of resource collision.
However, after the 5G network is introduced, it is found that when the V2X terminal is switched from the LTE network to the 5G network, the problem of the quality of the V2X service is reduced
Disclosure of Invention
The application provides a transmission resource scheduling method of a V2X terminal, which can improve the service quality of V2X.
A transmission resource scheduling method for a V2X terminal comprises the following steps:
when the mode 3V2X terminal is switched to the 5G network from the LTE network, the switched target base station receives the V2X transmission resource pool configuration of the PC5 interface sent by the source base station directly or through the core network;
after the V2X terminal is successfully switched to the 5G network, the target base station receives a sidelink sensing result of the PC5 interface measured and reported by the V2X terminal;
and the target base station allocates scheduling transmission resources for the V2X terminal according to the V2X transmission resource pool configuration and the sidelink sensing result of the PC5 interface.
Preferably, when an Xn interface exists between the target base station and the source base station, the target base station and the source base station interact with the PC5V2X transmission resource information respectively allocated to the target base station and the source base station through the Xn interface, so as to coordinate and schedule the V2X transmission resource of the PC5 interface.
Preferably, the allocating, by the target base station, the scheduling transmission resource for the V2X terminal includes:
and the target base station sends the scheduled transmission resources to the V2X terminal through a preset DCI format X, so that the V2X terminal sends SCI format 1 information on a PSCCH channel of a PC5 interface and schedules actual V2X message transmission.
Preferably, the DCI format X includes: a carrier indication, a lowest index allocated to a subchannel for initial transmission, SCI format 1 information, a sidelink index, a sidelink semi-persistent scheduling configuration index, and an activation/release indication;
wherein the SCI format 1 information includes: frequency domain resource locations for initial transmission and retransmission, time interval between initial transmission and retransmission.
Preferably, when an Xn interface exists between the source base station and the target base station, the configuration of the V2X transmission resource pool of the PC5 interface sent by the source base station includes: and the target base station directly receives the V2X transmission resource pool configuration of the PC5 interface sent by the source base station through the Xn interface.
Preferably, when there is no Xn interface between the source base station and the target base station, the receiving of the V2X transmission resource pool configuration of the PC5 interface sent by the source base station includes: and the target base station receives the V2X transmission resource pool configuration of the PC5 interface forwarded by the source base station through the core network through an Ng interface between the target base station and the core network.
Preferably, the V2X transmission resource pool information of the PC5 interface is included in a handover request message sent by a source base station to a target base station.
Preferably, the V2X transmission resource pool information of the PC5 interface is included in a message requiring handover, which is sent by a source base station to a core network.
Preferably, the result of the sidelink awareness of the PC5 interface is included in a handover complete message or a new message sent by the V2X terminal to the target base station, and the corresponding message further includes a V2X transmission indication and a corresponding V2X service type.
Preferably, the LTE base station or the 5G base station transmits a PC5 sidelink resource indication message on the Xn interface, which includes the PC5V2X transmission resource information allocated by the base station.
According to the technical scheme, in the application, when the mode 3V2X terminal is switched to the 5G network from the LTE network, the switched target base station receives the V2X transmission resource pool configuration of the PC5 interface sent by the source base station directly or through the core network; and after the V2X terminal is successfully switched to the 5G network, the target base station receives the sidelink sensing result of the PC5 interface measured and reported by the V2X terminal. And after the target base station acquires the V2X transmission resource pool configuration and the sidelink sensing result of the PC5 interface, allocating scheduling transmission resources for the V2X terminal by using the information. By the mode, the V2X terminal switched to the 5G network can still use the mode 3 to schedule transmission resources, so that the service quality of the V2X can be improved.
Drawings
Fig. 1 is a basic flowchart of a transmission resource scheduling method of a V2X terminal in the present application;
fig. 2 is a flowchart illustrating a method for scheduling transmission resources according to an embodiment of the present invention;
fig. 3 is a specific flowchart of a method for scheduling transmission resources according to a second embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical means and advantages of the present application more apparent, the present application will be described in further detail with reference to the accompanying drawings.
Currently, when a Mode 3V2X terminal supporting LTE PC5 communication is switched from an LTE network to a 5G network, because LTE network connection does not exist, the Mode 3V2X terminal can only switch to the Mode 4 Mode to continue to use the LTE PC5 interface to transmit V2X service data, and because the Mode 4V 2X terminal autonomously selects a transmission resource in a configured resource pool, the probability of resource collision is higher than that of Mode 3, which results in an increase in data transmission error rate and a decrease in V2X service quality. Based on the above analysis, the present application provides a method for scheduling transmission resources of a V2X terminal, so that after the V2X terminal is switched to a 5G network, the mode 3 is still adopted for resource scheduling, thereby reducing the probability of resource collision and improving the service quality of V2X.
Specifically, when a Mode 3V2X terminal is handed over from the LTE network to the 5G network, the LTE source base station transfers the configuration information of the PC5V2X transmission resource pool to the target 5G base station, and after the handover is completed, the 5G serving base station may avoid the occupied resources in the sensing result and schedule the resources in the transmission resource pool for the Mode 3 terminal based on the configuration information and the sensing result reported by the Mode 3 terminal.
Fig. 1 is a basic flowchart of a transmission resource scheduling method of a V2X terminal in the present application. As shown in fig. 1, the method includes:
When the V2X terminal is handed over from the LTE network to the 5G network, the source base station may send the V2X transmission resource pool configuration of the PC5 interface to the target base station through the Xn interface or the S1 interface.
And step 102, after the V2X terminal is successfully switched to the 5G network, the target base station receives a sidelink sensing result of the PC5 interface, which is measured and reported by the V2X terminal.
When the V2X terminal is successfully switched to the 5G network, the V2X reports the newly measured sidelink sensing result of the PC5 interface to the target base station, so that the target base station can obtain the occupation situation of the transmission resource on the current PC5 interface.
And 103, the target base station allocates scheduling transmission resources for the V2X terminal according to the V2X transmission resource pool configuration and the sidelink sensing result of the PC5 interface.
Through the processing of the above steps 101 and 102, the target base station has acquired the V2X transmission resource pool configuration and the sidelink awareness result of the PC5 interface, and can allocate transmission resources to the V2X terminal based on the above information, while avoiding occupied resources. The resource allocation method of the target base station is substantially the same as the resource allocation method of the mode 3 of the V2X terminal in the LTE network, and compared with the resource allocation method of the mode 4, the resource collision probability can be reduced, the data transmission error can be reduced, and the service quality of the V2X can be improved.
Specifically, when the target base station 5G serving cell allocates V2X transmission resources of the PC5 interface to the V2X terminal, it may preferably send DCI format X to the terminal, schedule the terminal to transmit on the PSCCH of the PC5 interface, and after receiving the DCI format, send SCI format 1 information carried in the DCI format X on the PSCCH channel of the PC5 interface, and schedule actual V2X message transmission. Wherein, the SCI format 1 information includes frequency domain resource locations of initial transmission and retransmission and time intervals between the initial transmission and the retransmission indicated in DCI format X. In the 5G system, a DCI format X may be newly added for allocating V2X transmission resources of the PC5 interface, and the DCI format X may include the following information:
-carrier indication
-lowest index of subchannel assigned to initial transmission
SCI format 1 information, including:
frequency domain resource location of initial transmission and retransmission
-time interval between initial transmission and retransmission
-secondary link index
-sidelink semi-persistent scheduling configuration index
-activation/release indication
So far, the most basic transmission resource scheduling method in the present application is finished. On the basis of the above flow, preferably, when an Xn interface exists between the 5G target base station and the LTE source base station, the 5G target base station and the LTE source base station may interact with the PC5V2X transmission resource information respectively allocated to them through the Xn interface, so that the 5G network and the LTE network can more coordinately schedule the V2X transmission resource of the PC5 interface.
The following two examples illustrate specific implementations of the present application.
The first embodiment is as follows:
an Xn interface is arranged between the LTE base station and the 5G base station, and the UE1 is a Mode 3V2X terminal supporting the transmission of LTE PC 5.
Fig. 2 is a flowchart illustrating a method for scheduling transmission resources according to an embodiment. As shown in fig. 2, the process includes:
1) UE1 is connected to an LTE network and carries out V2X service transmission according to time-frequency domain transmission resources of a PC5 secondary link which are scheduled and distributed by an LTE service cell;
2) as UE1 moves and enters a 5G network coverage range, UE1 triggers a measurement report, and an LTE service base station judges to perform inter-RAT switching;
3) an Xn interface is established between the target 5G base station and the source LTE service base station, and the source LTE base station sends a switching request message to the target 5G base station through the Xn interface, wherein the switching request message comprises V2X transmission resource pool information of a PC5 interface configured for a source cell;
4) after receiving the switching request, the target 5G base station allocates context and local wireless resources to the UE1, saves a transmission resource pool of a PC5 interface configured by the source LTE base station, and then returns a switching response to the source LTE base station;
5) after receiving the switching response, the source LTE base station sends a switching command message to the UE 1;
6) after receiving the switching command, UE1 tries to access the target 5G base station, and after successful access, sends a switching completion message to the target 5G base station, wherein the switching completion message comprises a V2X transmission indication, a corresponding V2X service type and a secondary link resource sensing result of a PC5 interface obtained by latest measurement of UE 1;
7) after receiving the switching completion message sent by the UE1, the target 5G base station allocates a sidelink time-frequency domain resource of the PC5 required for transmitting the V2X service to the UE1 based on the transmission resource pool configuration of the PC5 and the sensing result reported by the UE 1;
8) the 5G base station and the source LTE base station interact PC5 sidelink resource indication message through an Xn interface, wherein the PC5 sidelink resource indication message comprises transmission resources of PC5 interfaces distributed by all LTE V2X terminals currently served by the 5G cell/LTE cell, so that the 5G cell and the LTE cell can avoid resources distributed by an opposite terminal cell when the PC5 transmission resources are distributed in subsequent scheduling;
9) the 5G base station sends DCI format X to UE1 to schedule transmission resources of PC5 for UE1, and UE1 continues to transmit V2X traffic data on the PC5 interface according to the scheduling of the 5G serving base station.
As in the above flow, an Xn interface exists between the LTE base station and the 5G base station, and the source base station may send the configuration of the V2X transmission resource pool of the PC5 interface to the 5G base station, and preferably, after the handover is successful, the source base station and the target base station may further interact with the PC5V2X transmission resource information respectively allocated thereto, so as to better coordinate and schedule the PC5V2X resources.
Example two:
there is no Xn interface between the LTE base station and the 5G base station, and UE2 is a Mode 3V2X terminal supporting LTE PC5 transmission.
Fig. 3 is a flowchart illustrating a method for scheduling transmission resources according to a second embodiment. As shown in fig. 3, the process includes:
1) about 2) in the same manner as in example 1
3) The method comprises the steps that an Xn interface does not exist between a target 5G base station and a source LTE service base station, the source LTE base station triggers a switching preparation process, and sends a message requiring switching to a core network through an S1 interface, wherein the message comprises V2X transmission resource pool information of a PC5 interface configured by a source LTE cell, and the core network forwards a switching request message to the target 5G base station through an Ng interface after receiving the message;
4) after receiving the switching request, the target 5G base station allocates context and local wireless resources to the UE2, stores a transmission resource pool of the PC5 configured by the source LTE base station, then returns a switching request response to the core network, and after receiving the switching request response, the core network sends a switching command to the source LTE base station as a response of the source base station requiring the switching message in the step 3);
5) 7) 5) to 7) of the same embodiment one);
8) the 5G base station sends DCI format X to UE2 to schedule transmission resources of PC5 for UE1, and UE2 continues to transmit V2X traffic data on the PC5 interface according to the scheduling of the 5G serving base station.
As in the above procedure, there is no Xn interface between the LTE base station and the 5G base station, and the source base station needs to send the configuration of the V2X transmission resource pool of the PC5 interface to the core network through the S1 interface, and then the core network forwards the configuration to the 5G base station through the Ng interface.
The foregoing is a specific implementation of the transmission resource scheduling method for the V2X terminal in this application. In the technical scheme, when a Mode 3V2X terminal is switched to a 5G network from an LTE network, an LTE source base station transfers PC5V2X transmission resource pool configuration information to a target 5G base station, after the switching is completed, the terminal reports a newly measured sidelink sensing result of a PC5 interface to the target 5G base station, and a 5G serving cell allocates PC5V2X transmission resources to the terminal based on the configuration of a PC5V2X transmission resource pool and the sensing result reported by the terminal; in addition, the 5G base station and the source LTE base station may also interact with the PC5 sidelink resource indication message through an Xn interface, where the PC5 sidelink resource indication message includes transmission resources of a PC5 interface allocated by the 5G cell/LTE cell to the LTE mode 3V2X terminal respectively serving the 5G cell/LTE cell, so that the 5G cell and the LTE cell can avoid resources already allocated by the opposite cell when allocating PC5 transmission resources in subsequent scheduling. Through the processing, the 5G service base station can continue to schedule and allocate the V2X transmission resources of the LTEPC5 interface, so that the collision probability of data transmission is not increased, and the service quality of the original V2X can be guaranteed.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method for scheduling transmission resources of a V2X terminal, comprising:
when the mode 3V2X terminal is switched to the 5G network from the LTE network, the switched target base station receives the V2X transmission resource pool configuration of the PC5 interface sent by the source base station directly or through the core network;
after the V2X terminal is successfully switched to the 5G network, the target base station receives a sidelink sensing result of the PC5 interface measured and reported by the V2X terminal;
and the target base station allocates scheduling transmission resources for the V2X terminal according to the V2X transmission resource pool configuration and the sidelink sensing result of the PC5 interface.
2. The method of claim 1, wherein when an Xn interface exists between the target base station and the source base station, the target base station and the source base station interact with the respectively allocated PC5V2X transmission resource information through the Xn interface for coordinating and scheduling the V2X transmission resources of the PC5 interface.
3. The method of claim 1, wherein the target base station allocating scheduling transmission resources for the V2X terminal comprises:
and the target base station sends the scheduled transmission resources to the V2X terminal through a preset DCI format X, so that the V2X terminal sends SCI format 1 information on a PSCCH channel of a PC5 interface and schedules actual V2X message transmission.
4. The method of claim 3, wherein the DCI format X comprises: a carrier indication, a lowest index allocated to a subchannel for initial transmission, SCI format 1 information, a sidelink index, a sidelink semi-persistent scheduling configuration index, and an activation/release indication;
wherein the SCI format 1 information includes: frequency domain resource locations for initial transmission and retransmission, time interval between initial transmission and retransmission.
5. The method as claimed in claim 1, wherein when an Xn interface exists between the source base station and the target base station, the receiving the V2X transmission resource pool configuration of the PC5 interface sent by the source base station comprises: and the target base station directly receives the V2X transmission resource pool configuration of the PC5 interface sent by the source base station through the Xn interface.
6. The method as claimed in claim 1, wherein when there is no Xn interface between the source base station and the target base station, the receiving the V2X transmission resource pool configuration of the PC5 interface sent by the source base station comprises: and the target base station receives the V2X transmission resource pool configuration of the PC5 interface forwarded by the source base station through the core network through an Ng interface between the target base station and the core network.
7. The method of claim 5, wherein the V2X transport resource pool information of the PC5 interface is included in a handover request message sent by a source base station to a target base station.
8. The method of claim 6, wherein the V2X transport resource pool information of the PC5 interface is included in a message sent by a source base station to a core network that requires handover.
9. The method as claimed in claim 1, wherein the sidelink awareness result of the PC5 interface is included in a handover complete message or a new addition message sent by the V2X terminal to the target base station, and further includes a V2X transmission indication and a corresponding V2X service type in the corresponding message.
10. The method of claim 2, wherein an LTE base station or a 5G base station transmits a PC5 sidelink resource indication message over an Xn interface, including PC5V2X transmission resource information that the base station has allocated.
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