CN107734480B

CN107734480B - Switching method and system

Info

Publication number: CN107734480B
Application number: CN201610664209.7A
Authority: CN
Inventors: 周欣; 姜春霞; 李维娜; 吕征南
Original assignee: Putian Information Technology Co Ltd
Current assignee: Putian Information Technology Co Ltd
Priority date: 2016-08-12
Filing date: 2016-08-12
Publication date: 2020-01-17
Anticipated expiration: 2036-08-12
Also published as: CN107734480A

Abstract

The application discloses a switching method and a system, wherein the method comprises the following steps: when the base station eNDEB determines that user equipment UE with the vehicle near field communication function authorized by the cell needs to be switched, the UE is triggered to be switched to a target cell, and the available V2V sending resources used by the UE in the switching process and the available V2V sending resources after the switching is successful are notified to the UE; during the handover, the UE transmits a resource transmission V2V message using the V2V usable in the handover; after the handover is successful, the UE sends a resource transmission V2V message by using V2V which can be used after the handover is successful. By adopting the method and the device, the switching success rate of the UE with the authorized vehicle near field communication function can be improved, and the switching time delay is reduced.

Description

Switching method and system

Technical Field

The present invention relates to mobile communication technologies, and in particular, to a handover method and system.

Background

Vehicle to X (V2X) information exchange is a key technology of future intelligent transportation systems. V2X was approved at 3GPP RAN #68 conference, mainly studying vehicle data transmission schemes based on 3GPP communication protocols. Currently, in the existing report, V2X applications include Vehicle-to-Vehicle (V2V), Vehicle-to-Infrastructure (V2I), Vehicle-to-Pedestrian (V2P), and Vehicle-to-Network (V2N), as shown in fig. 1. The application of V2X will improve driving safety, reduce congestion and vehicle energy consumption, improve traffic efficiency and vehicle-mounted entertainment information, etc.

At present, a Dedicated Short Range Communications (DSRC) technology is usually adopted to transmit V2X traffic, but the transmission index, such as communication distance, time delay or reliability, cannot meet the technical requirement of V2X traffic on the transmission index. For V2X traffic, three V2X deployment scenarios are introduced by 3GPP TR36.885 to date: a scenario in which V2X transmission is supported based on only the PC5 port, a scenario in which V2X transmission is supported based on only the Uu port, and a scenario in which V2X transmission is supported based on the PC5 port and the Uu port.

When the User Equipment (UE) performs the V2X service, the location may move, and the cell may be changed. If the UE is in a Radio Resource Control (RRC) connected state, the UE needs to be handed over to a destination cell. How to implement and optimize the handover procedure for a UE transceiving V2X traffic is a problem to be considered.

For the switching process in the existing 3GPP protocol, a target eNB cannot identify the type of UE and know whether the UE authorizes the function of near field communication with a vehicle. Thus, the target eNB cannot guarantee access to the in-vehicle terminal/pedestrian terminal and allocate a PC5 pool for it to use during handover. Particularly, under the condition of a large cell load, the access of the vehicle-mounted terminal and the pedestrian terminal under the same condition cannot be ensured, so that an extra time delay is introduced in the switching process, and further the service delay of the V2X is increased.

Therefore, for the UE with authorized vehicle short-range communication function, the existing handover scheme has the problems of reducing the success rate of handover, increasing the time delay of handover, and affecting the normal operation of the V2X service.

Disclosure of Invention

In view of the above, the main objective of the present invention is to provide a handover method and system, which can improve the handover success rate of the UE with the authorized vehicle short-range communication function and reduce the handover delay.

In order to achieve the purpose, the technical scheme provided by the invention is as follows:

a method of handover, comprising:

when the base station eNDEB determines that user equipment UE with the vehicle near field communication function authorized by the cell needs to be switched, the UE is triggered to be switched to a target cell, and the available V2V sending resources used by the UE in the switching process and the available V2V sending resources after the switching is successful are notified to the UE;

during the handover, the UE transmits a resource transmission V2V message using the V2V usable in the handover;

after the handover is successful, the UE sends a resource transmission V2V message by using V2V which can be used after the handover is successful.

A handover system, comprising: a base station eNdeB and user equipment UE; wherein the content of the first and second substances,

the base station is used for triggering the UE to be switched to a target cell when the UE with the vehicle near field communication function authorized by the cell is judged to need switching, and informing the UE of available V2V sending resources in the switching process and available V2V sending resources after the switching is successful;

UE, for transmitting resource transmission V2V message by using the V2V usable in the switching process; after the switching is successful, a resource transmission V2V message is sent by using V2V which can be used after the switching is successful.

In summary, according to the handover method and system provided by the present invention, when the UE with authorized vehicle near field communication function is handed over, the network side configures the sending pool used in the handover process and the sending pool used in the target cell after the UE is handed over to the target cell for the UE, so that it can be effectively ensured that the UE can send the V2X information in the handover process, and thus the problems of long time delay in the handover process, influence on the V2X service, and the like due to the absence of sending pool resources can be avoided.

Drawings

FIG. 1 is a schematic diagram of a conventional V2X application type;

FIG. 2 is a schematic flow diagram of the process of the present invention;

FIG. 3 is a flow chart illustrating a method of an embodiment of an intra-base station handover in accordance with the present invention;

FIG. 4 is a flowchart illustrating a method for inter-base station handover with port X2 according to an embodiment of the present invention;

FIG. 5 is a flowchart illustrating a method for inter-base station handover at port S1 according to an embodiment of the present invention;

FIG. 6 is a flow chart of the system architecture of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

The core idea of the invention is as follows: when the UE with the authorized vehicle near field communication function is switched, the network side configures a sending pool used in a non-RRC connection state in the switching process and a sending pool used in a target cell after the UE is switched to the target cell for the UE, and notifies the UE. Therefore, the method and the device can effectively ensure that the V2X information can be sent in the switching process, thereby avoiding the problems of long time delay in the switching process, influence on V2X service and the like caused by no sending pool resource.

Fig. 2 is a schematic flow chart of the method of the present invention, and as shown in fig. 2, the method mainly includes:

step 201, when the base station eNdeB determines that the UE with the vehicle near field communication function authorized in the cell needs to be switched, the UE is triggered to be switched to the target cell, and the resource sent by the V2V and the resource sent by the V2V which can be used after the UE is successfully switched in the switching process are notified to the UE.

The difference between this step and the existing handover scheme is that when the UE with authorized vehicle short-range communication function is handed over, the network side needs to configure the V2V transmission resource that the UE can use during the handover process and the V2V transmission resource that can be used after the handover is successful for the UE, so that by using the V2V transmission resource that can be used during the handover process, the UE can transmit V2X information at the PC5 port when in the non-RRC connected state during the handover process, and after the UE is handed over to the target cell, can transmit V2X information by using the V2V transmission resource that can be used after the handover is successful. Therefore, the problems of long time delay of the switching process, influence on the V2X service and the like caused by no sending pool resource can be effectively avoided.

In order to make the UE in the non-RRC connected state conveniently use the allocated transmission pool, it is preferable that the V2V transmission resource available in the handover process is a transmission pool in a UE autonomous selection manner, so that the UE can autonomously select resource usage directly from the allocated transmission pool.

For the V2V transmission resources that can be used after the handover is successful, a V2V transmission pool of UE autonomous selection mode and/or scheduling mode can be configured.

Preferably, in this step, the notification may be performed by using a Radio Resource Control (RRC) connection reconfiguration message in the existing handover process, and the specific method is as follows:

the base station sends RRC connection reconfiguration information to the UE, wherein the RRC connection reconfiguration information carries mobile control information (MobilityControlInfo), a special V2V sending resource configuration cell (SL-V2 VTxPolExceptionConfig) and a target cell V2V sending resource configuration cell (SL-V2 VTxPolConfig).

The mobility control info is used to indicate a handover parameter, and the specific content is the same as that of the existing system and is not described herein again.

The special V2V transmission resource allocation information element is used to indicate the V2V transmission resource that can be used in the handover process, and the destination cell V2V transmission resource allocation information element is used to indicate the V2V transmission resource that can be used after the handover is successful. The two cells are newly added cells in the RRC connection reconfiguration message, and specifically can be implemented by using a reserved field in the RRC connection reconfiguration message.

Specifically, the SL-V2 vtxpoloxeceioncoconfig cell will include a secondary link V2V transmission pool list SL-V2 vtxpololist, in which at least one secondary link V2V resource pool SL-V2VResourcePool is included. The SL-V2VResourcePool mainly includes cells such as the length of the secondary link CP, the V2V control information transmission resource configuration, the V2V data transmission resource configuration of the UE autonomous selection mode, and the secondary link transmission power related configuration parameters. The sending resource allocation cell contains time domain indication information and frequency domain indication information, and the available time-frequency domain resources are obtained through the cell allocation.

The SL-V2VTxPoolConfig cell includes a V2V transmit resource V2 VTxResources. The V2VTxResources comprises the establishment/release of V2V transmission resource configuration, and the establishment of V2V transmission resource configuration comprises the V2V transmission resource configuration of a scheduling mode V2V transmission resource configuration and/or a UE autonomous selection mode. The scheduling mode V2V sending resource configuration mainly includes the secondary link CP length, V2V control information sending resource configuration, the relevant configuration of the Sidelink BSR, SL-RNTI, and optionally the SPSSL-RNTI and MCS. The V2V sending resource configuration of the UE autonomous selection mode includes V2V sending pool general proprietary configuration V2VTxPoolNormalDedicated, and V2VTxPoolNormalDedicated includes V2V resource pool add list V2vpooltoaddlist V2V and resource pool release list V2 VpoolToReleaseList. Wherein V2VpoolToAddList comprises at least one added secondary link V2V resource pool V2VpoolToAdd, and V2VpoolToAdd comprises V2V comprising a sending pool id (txpool identity) and a secondary link V2V resource pool SL-V2 VResourcePool. The V2VpoolToReleaseList contains at least one send pool ID that releases the resource pool.

Step 202, during the execution of the handover, the UE sends a resource transmission V2V message by using the V2V available in the handover process.

Step 203, after the switching is successful, the UE sends a resource transmission V2V message by using the V2V available after the switching is successful.

Further, when the handover is an inter-base station handover, the source base station needs to notify the destination eNB of the terminal type of the UE and the authorized vehicle near field communication function through source-to-destination RRC transparent transmission, so that the target eNB can configure corresponding resources capable of ensuring its access for the target eNB, so as to ensure the smooth access of the UE, reduce handover delay, and ensure the smooth proceeding of the V2X service. Specifically, the following method can be adopted:

the base station informs the destination base station of the terminal type of the UE and the Authorized Vehicle near field communication function by carrying a Vehicle near field communication Authorized (Vehicle-ProSe Authorized) cell in a Handover Request (Handover Request) message or a Handover required (Handover requested) message.

And the target base station allocates the V2V transmission resource which can be used in the switching process and the V2V transmission resource which can be used after the switching is successful to the UE according to the vehicle near field communication authorization information element, and informs the allocated result to the switching source base station through a switching request response message or a switching request response message.

In order to ensure the successful switching of the vehicle-mounted terminal, when the UE is the vehicle-mounted terminal, the destination base station allocates the two types of V2V transmission resources to the UE by using the principle of preferentially allocating the resources. Therefore, the access of the vehicle-mounted terminal can be preferentially ensured under the same condition, namely the access priority of the vehicle-mounted terminal is higher than that of the pedestrian terminal.

In practical applications, the terminal type of the UE may be notified by carrying different communication authorization cells in a Handover Request (Handover Request) message or a Handover Required (Handover Required) message, for example, for a Vehicle-mounted terminal, the Vehicle-ProSe Authorized cell is used to indicate that the terminal type of the UE is a Vehicle-mounted terminal and an Authorized Vehicle short-range communication function, and a newly added Pedestrian-Vehicle short-range communication authorization (Pedestrian-ProSe Authorized) cell is used to notify a destination eNB that the UE is a Pedestrian terminal and is Authorized to perform the Pedestrian-Vehicle short-range communication function.

Preferably, in order to further ensure that the UE accesses the destination cell smoothly, the destination base station may access the default bearer and allocate resources related to V2X for the UE according to the vehicle short-range communication authorization information element and on the basis of the principle of preferential admission and resource allocation. In this way, when handling the access of the terminal for handover, the destination eNB performs special processing on the terminal authorized for the vehicle short-range communication function in terms of the admission decision policy to ensure the access of the vehicle-mounted terminal and the pedestrian terminal and the allocation of the handover resources related to V2X.

By adopting the scheme, the V2V service of the UE can be effectively ensured not to be influenced in the switching process, and the method and the device are also suitable for ensuring the smooth operation of the V2P service in the switching process. In order to support the smooth proceeding of the V2P service in the Handover process, for the Handover between eNode bs, as described above, by expanding the X2 message Handover Request and the S1 message Handover Request, and adding a Pedestrian-vehicle near-field communication authorization (pest-prose authorized) cell, the target eNB may be notified that the UE is a Pedestrian terminal and has authorized the function of near-field communication between pedestrians and vehicles, so that the target eNB may ensure the configuration of its access and transmission pool for the Pedestrian terminal. Meanwhile, as with the above-described V2V service, a special V2P transmission resource configuration (SL-V2ptxpool expeceptionconfig) cell and a V2P transmission resource configuration (SL-V2PTxPoolConfig) cell of the destination cell are added to the RRC connection reconfiguration message. The contents of the two cells are similar to the V2V transmission resource configuration, that is, the special V2P transmission resource configuration is used to indicate the available V2P transmission resource during the handover process, and the V2P transmission resource configuration of the destination cell is used to indicate the available V2P transmission resource after the handover is successful. The two cells are newly added cells in the RRC connection reconfiguration message, and specifically can be implemented by using a reserved field in the RRC connection reconfiguration message.

For the convenience of understanding the above-described aspect of the present invention, the intra-eNodeB handover procedure, the inter-eNodeB handover procedure at X2 port, and the inter-eNodeB handover procedure at S1 port, to which the present invention is applied, will be described in detail below based on the conventional intra-eNodeB handover procedure, the inter-eNodeB handover procedure at X2 port, and the inter-eNodeB handover procedure at S1 port.

Fig. 3 is a schematic flowchart of an intra-eNodeB handover embodiment of the present invention, and as shown in fig. 3, the handover procedure includes the following steps:

step 301, the UE configures the V2V transmission pool of the UE according to the resource configuration information element sent by V2V in the RRC connection reconfiguration message of the source cell, and transmits the V2V message through the Sidelink link of PC5 interface.

In this step, the UE authorized for the vehicle short-range communication function transmits a V2V message using the PC5 port resource configured in the source cell before the handover.

Step 302, the UE performs corresponding measurement according to the measurement configuration provided by the eNB, and reports a measurement report according to a criterion.

And step 303, the eNodeB judges to perform the intra-eNodeB handover and determines the target cell of the UE handover.

Step 304, the eNodeB sends an RRC Connection reconfiguration message to the UE, where the message carries MobilityControlInfo, a special V2V sending resource, and a destination cell V2V sending resource configuration information element to instruct the UE to perform handover to the destination cell and to send a resource for V2V configured by the destination cell after the UE is successfully handed over.

Step 305, during the process of executing handover, the UE configures the V2V transmission pool of the UE according to the special V2V transmission resource configuration cell in step 304, and transmits the V2V message through the Sidelink link of the PC5 port.

Here, when the UE has a V2V message transmission via PC5 during the handover from the source cell to the destination cell, the UE uses the transmission resources configured in step 305, and the resources are selected by the UE.

Step 306, the UE executes the handover procedure, leaves the source cell, synchronizes with the destination cell, and starts the random access procedure.

Step 307, after the UE handover operation is completed, returning an RRC Connection reconfiguration Complete message to indicate that the eNodeB handover configuration is completed.

Step 308, after the handover is completed, the UE configures the V2V transmission pool of the UE by transmitting the resource configuration information element according to the destination cell V2V in step 304, and transmits the V2V message through the Sidelink link of the PC5 interface.

Step 309-.

Fig. 4 is a schematic flowchart of an exemplary inter-eNodeB handover with X2 according to the present invention, and as shown in fig. 4, the handover procedure includes the following steps:

step 401, the UE configures the V2V sending pool of the UE according to the resource configuration cell sent by V2V in the RRC connection reconfiguration message of the source cell, and transmits the V2V message through the Sidelink link of PC5 interface.

Step 402, the UE performs corresponding measurement according to the measurement configuration provided by the eNB, and reports a measurement report according to a criterion.

And step 403, the source eNodeB makes a decision according to the measurement report, and determines to trigger the X2 handover procedure.

Step 404, the source eNodeB sends a Handover Request message to the destination eNodeB. And instructing the target eNodeB to create the UE context of the UE to be switched, wherein the UE context comprises information of load bearing (QOS parameter, XGW address and TEID), security information context and the like, and a newly added Vehicle-ProSe Authorized information element.

Step 405, after the target eNodeB successfully allocates the resources on the target side, the target eNodeB sends a handover acknowledgement message to the source eNodeB.

Step 406, the source eNodeB sends an RRC Connection reconfiguration message to the UE, where the message carries MobilityControlInfo, a special V2V sending resource, and a destination cell V2V sending resource configuration information element to instruct the UE to perform handover to the target eNodeB and to send the resource for the V2V configured by the destination cell during the handover process and after the handover is successful.

Step 407, the source eNodeB sends an SN Status Transfer message to the destination eNodeB, which is used to Transfer the uplink PDCP-SN receiving end state and the downlink PDCP-SN sending end state on the X2 interface.

Step 408, during the handover procedure, the UE configures the V2V transmission pool of the UE according to the special V2V transmission resource configuration cell in step 406, and transmits the V2V message through the Sidelink link of the PC5 interface.

It should be noted that, in the process of switching the UE from the source cell to the destination cell, if the UE has V2V message transmission based on port PC5, the UE uses the transmission resource configured for the UE in step 406, and the resource is a resource autonomously selected by the UE.

Step 409, the UE executes the handover procedure, leaves the source cell, synchronizes with the destination cell, and starts the random access procedure.

Step 410, after the UE and the target cell are successfully synchronized, the UE sends an RRC connectionreconfiguration Complete message to the target eNodeB to indicate that the handover is completed. The forwarded downlink data packets from the source eNodeB are sent to the UE. Also, uplink packets are sent from the UE to the destination Serving GW and PDN GW.

Step 411, after the handover is completed, the UE configures the V2V transmission pool of the UE according to the resource configuration cell transmitted by the destination cell V2V in step 406, and transmits the V2V message through the Sidelink link of the PC5 interface.

Step 412, the destination eNodeB sends a Path Switch Request message to the EPC, informs the EPC that the UE has been handed over to the target eNodeB, and carries the Source MME UE S1AP ID, the UE security capability, the transport address of the T-eNodeB, and the TEID in the message.

Step 413, the EPC sends a Path Switch Request acknowledge message to the destination eNodeB to notify the destination eNodeB that the Path switching is successful, including bearer list information (XGW address and TEID)) that the EPC has been successfully established and a bearer list that needs to be deleted.

Step 414, the destination eNodeB sends a UE context release message to the source eNodeB to notify the source eNodeB to release the UE context. And the source eNodeB releases all signaling connections and related resources of an air interface of the control plane.

Fig. 5 is a schematic flowchart of an exemplary handover procedure between enodebs of S1 according to the present invention, and as shown in fig. 5, the handover procedure includes the following steps:

step 501, the UE configures the V2V transmission pool of the UE according to the resource configuration cell sent by V2V in the RRC connection reconfiguration message of the source cell, and transmits the V2V message through the Sidelink link of PC5 interface.

Step 502, the UE performs corresponding measurement according to the measurement configuration provided by the eNB, and reports a measurement report according to a criterion.

Step 503, the source eNodeB makes a decision according to the measurement report, and determines to trigger the S1 handover procedure.

And step 504, the source eNodeB sends a Handover Required message to the EPC. The message carries information elements such as a target eNodeB-ID, a bearer which needs data forwarding, an indication whether direct forwarding from the source eNB to the target eNB can be carried out, and a newly added Vehicle-ProSe Authorized information element.

And 505, the EPC sends a Handover Request message to the target eNodeB. And instructing the target eNodeB to create the UE context of the UE to be switched, wherein the UE context comprises information of bearer (QOS parameter, SGW address and TEID), security information context and the like.

Step 506, after the target eNodeB successfully allocates the resources on the target side, the target eNodeB sends a Handover request acknowledge message to the EPC. The EPC is informed that the destination eNodeB is ready for handover. The message includes the destination eNodeB assigning a downlink address and TEID for each bearer and the destination cell V2V sending a resource configuration information element.

And step 507, the EPC sends a Handover Command to the source eNodeB.

Step 508, the source eNodeB sends an RRC Connection reconfiguration message to the UE, where the message carries MobilityControlInfo, a special V2V sending resource, and a destination cell V2V sending resource configuration information element to instruct the UE to perform handover to the target eNodeB and to instruct the UE to perform the handover to the V2V sending resource configured for the destination cell after the UE is successfully handed over.

Step 509, the source eNodeB sends an eNB Status Transfer message to the EPC for transferring the uplink PDCP-SN receiving end state and the downlink PDCP-SN sending end state on the S1 interface.

Step 510, the EPC sends an MME Status Transfer message to the destination eNodeB.

In step 511, during the handover procedure, the UE configures the V2V transmission pool of the UE according to the special V2V transmission resource configuration cell in step 508, and transmits the V2V message through the Sidelink link of the PC5 interface.

Note: here, in the process of switching the UE from the source cell to the destination cell, if the UE has V2V message transmission based on PC5 port, the UE uses the transmission resource configured for the UE in step 508, and the resource is a resource autonomously selected by the UE.

Step 512, the UE executes the handover procedure, leaves the source cell, synchronizes with the destination cell, and starts the random access procedure.

Step 513, after the UE and the target cell are successfully synchronized, the UE sends an RRC connectionreconfiguration Complete message to the target eNodeB to indicate that the handover is completed. The forwarded downlink data packets from the source eNodeB are sent to the UE. Also, uplink packets are sent from the UE to the destination Serving GW and PDN GW.

Step 514, after the handover is completed, the UE configures the V2V transmission pool of the UE by transmitting the resource configuration information element according to the destination cell V2V in step 508, and transmits the V2V message through the Sidelink link of the PC5 interface.

Step 515, the destination eNodeB sends a HANDOVER NOTIFY message to the EPC to NOTIFY the EPC of the completion of the HANDOVER.

Step 516, the EPC sends a UE context release message to the source eNodeB to notify the source eNodeB to release the UE context.

Step 517, the source eNodeB releases all signaling connections and air interface related resources of the control plane, and returns a UE Context Release Complete message to the EPC.

The messages in the embodiments shown in fig. 3 to 5 are the same as the messages in the existing system Handover schemes, except that some messages (RRC connection reconfiguration message, Handover Request message, and Handover requested message) carry newly added information, and are not described herein again.

Fig. 6 is a schematic structural diagram of a switching system corresponding to the method shown in fig. 2, and as shown in fig. 6, the system includes: a base station eNdeB and user equipment UE; wherein the content of the first and second substances,

Preferably, the base station is configured to send a radio resource control, RRC, connection reconfiguration message to the UE, where the RRC connection reconfiguration message carries mobile control information, MobilityControlInfo, a special V2V sending resource configuration cell, and a target cell V2V sending resource configuration cell, where the special V2V sending resource configuration cell is used to indicate the V2V sending resource that can be used in the handover process, and the target cell V2V sending resource configuration cell is used to indicate the V2V sending resource that can be used after the handover is successful.

Preferably, the V2V transmission resource available in the handover process is a transmission pool of UE autonomous selection modes.

Preferably, when the handover is an inter-base station handover, the system further includes a destination base station;

the source base station for switching is used for notifying the terminal type of the UE and the short-range communication function of the authorized vehicle to the target base station by carrying the short-range communication authorization cell of the vehicle in the switching Request Handover Request message or the switching Request Handover Required message;

and the target base station is used for allocating the available V2V sending resources in the switching process and the available V2V sending resources after the switching is successful to the UE according to the vehicle near field communication authorization information element, and informing the allocated result to the switching source base station through a switching request response message or a switching request response message, wherein when the UE is a vehicle-mounted terminal, the target base station adopts the principle of preferentially allocating the resources to perform the allocation.

Preferably, the destination base station is configured to access a default bearer and allocate resources related to V2X for the UE according to the vehicle near field communication authorization information element and on the basis of a principle of preferential admission and resource allocation.

In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method of handover, comprising:

when the base station determines that the UE with the vehicle near field communication function authorized by the cell needs to be switched, the UE is triggered to be switched to a target cell, and the available V2V sending resources of the UE in the switching process and the available V2V sending resources after the UE is successfully switched are notified to the UE;

2. The method of claim 1, wherein the notifying comprises:

the base station sends a Radio Resource Control (RRC) connection reconfiguration message to the UE, wherein the RRC connection reconfiguration message carries mobile control information (MobilyControlInfo), a special resource configuration cell sent by V2V and a resource configuration cell sent by a target cell V2V, wherein the special resource configuration cell sent by V2V is used for indicating the usable V2V sending resource in the switching process, and the target cell V2V sending resource configuration cell is used for indicating the usable V2V sending resource after the switching is successful.

3. The method of claim 2, wherein the V2V transmission resource usable in the handover process is a transmission pool of UE autonomous selection modes.

4. The method of claim 1, wherein when the handover is an inter-base station handover, the method further comprises:

the base station informs the terminal type of the UE and the authorized vehicle near field communication function to the target base station by carrying a vehicle near field communication authorization cell in a Handover Request message or a Handover Request message;

and the target base station allocates the available V2V sending resources in the switching process and the available V2V sending resources after the switching is successful to the UE according to the vehicle near field communication authorization information element, and informs the allocated result to the switching source base station through a switching request response message or a switching request response message, wherein when the UE is a vehicle-mounted terminal, the target base station allocates the resources by adopting a principle of preferentially allocating the resources.

5. The method of claim 4, further comprising:

and the target base station accesses a default bearer and allocates V2X related resources for the UE according to the vehicle near field communication authorization information element and a principle of preferential admission and resource allocation.

6. A handover system, comprising: a base station and User Equipment (UE); wherein the content of the first and second substances,

7. The system of claim 6,

the base station is configured to send a radio resource control RRC connection reconfiguration message to the UE, where the RRC connection reconfiguration message carries mobility control information MobilityControlInfo, a special V2V sending resource configuration cell, and a target cell V2V sending resource configuration cell, where the special V2V sending resource configuration cell is used to indicate that the V2V that can be used in the handover process sends resources, and the target cell V2V sending resource configuration cell is used to indicate that the V2V that can be used after the handover is successful sends resources.

8. The system according to claim 7, wherein the V2V transmission resource available in the handover procedure is a transmission pool of UE autonomous selection mode.

9. The system of claim 6, wherein when the handover is an inter-base station handover, the system further comprises a destination base station;

10. The system of claim 9,

and the destination base station is used for accessing a default bearer and allocating V2X related resources for the UE according to the vehicle near field communication authorization information element and the principles of preferential admission and resource allocation.