CN111093233A - A handover control method, device and base station - Google Patents

Abstract

The invention provides a switching control method, a device and a base station, wherein the method comprises the following steps: sending a switching request message to a target base station, and receiving a switching request confirmation message sent by the target base station or receiving a switching rejection message sent by the target base station; after receiving a switching request confirmation message sent by a target base station, sending a switching command for indicating the terminal to switch to the target base station to the terminal, and sending an SN state report to the target base station according to a first mapping relation and a second mapping relation, wherein the SN state report carries the SN of the next protocol data unit PDU to be transmitted; the embodiment of the invention acquires the second mapping relation through the switching request confirmation message and sends the SN state report to the target base station according to the first mapping relation and the second mapping relation, thereby ensuring the continuity of data transmission by using the same SN for the target base station and realizing the lossless switching among the base stations.

Description

A handover control method, device and base station

technical field

The present invention relates to the field of communication technologies, and in particular, to a handover control method, device and base station.

Background technique

The concept of end-to-end bearer is used in LTE (Long Term Evolution), wherein the EPS (Evolved Packet System, Evolved Packet System) bearer and E-RAB (Evolved Radio Access Bearer, Evolved Radio Access Bearer) are in a one-to-one correspondence. The management mechanism of QoS (Quality of Service, quality of service) in LTE takes the bearer as the smallest granularity.

In order to achieve more fine-grained QoS management in 5G, a management mechanism based on QoS flow is introduced. The 5G system architecture and process protocols TS 23.501 and 23.502 that have been completed by 3GPP form the following conclusions: the concept of canceling the bearer on the core network side, introducing QoS flow, However, the RAN (Radio Access Network, radio access network) side still retains the concept of DRB (Data Resource Bearer, data bearer); the terminal can establish one or more PDU (Protocol Data Unit, protocol data unit) sessions at the same time, each PDU session Contains one or more QoS flows (QoS Flow), and multiple QoS flows can be mapped to a DRB.

Due to the different RRM (Radio Resource Management, Radio Resource Management) policies and channel conditions of different base stations, after the introduction of the flow-based QoS management mechanism in 5G, there is a different mapping relationship between the QoS flows supported by the source base station and the target base station to the DRB during handover. Therefore, the existing LTE handover mechanism and process cannot be supported.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a handover control method, device and base station to solve the problem that the existing handover mechanism and process between base stations cannot support the 5G system.

In order to solve the above problem, an embodiment of the present invention provides a handover control method, which is applied to a source base station, including:

sending a handover request message to the target base station, where the handover request message carries the first mapping relationship between the quality of service flow of the source base station and the wireless data bearer;

Receive a handover request confirmation message sent by the target base station, or receive a handover rejection message sent by the target base station; the handover request confirmation message carries a first indication of the first mapping relationship between the quality of service flow and the wireless data bearer used by the target base station information or carrying second indication information used to indicate the second mapping relationship between the quality of service flow of the target base station and the wireless data bearer; the handover rejection message is used to indicate that the target base station does not have a wireless data bearer that can meet the handover requirement.

Wherein, the handover request message also includes at least one of the following information:

The identification information of the quality of service flow;

Reflect the configuration information of the quality of service flow and the wireless data bearer mapping;

And, the configuration information of the mapping of the uplink quality of service flow and the wireless data bearer.

Wherein, the handover request message further includes:

PDU session-based data forwarding proposal; or,

Data fronthaul proposal based on wireless data bearer; or,

Data forwarding proposal based on quality of service flow.

Wherein, when the handover request message includes a PDU session-based data forwarding proposal, the handover request confirmation message further includes: address information of the first data forwarding tunnel allocated by the target base station for the PDU session;

The method also includes:

According to the address information of the first data forwarding tunnel, data packets are forwarded to the target base station on the first data forwarding tunnel, wherein each data packet forwarded on the first data forwarding tunnel carries a service Identification information for the mass flow.

Wherein, when the handover request message includes a data forwarding proposal based on the wireless data bearer, the handover request confirmation message further includes: address information of the second data forwarding tunnel allocated by the target base station for the wireless data bearer;

When the handover request message includes a data forwarding proposal based on the quality of service flow, the handover request confirmation message further includes: address information of a third data forwarding tunnel allocated by the target base station for the quality of service flow.

Wherein, the method also includes:

After receiving the handover request confirmation message sent by the target base station, a handover command instructing the terminal to switch to the target base station is sent to the terminal, and a sequence number SN status report is sent to the target base station.

Wherein, the sending the sequence number SN status report to the target base station includes:

When the first mapping relationship is the same as the second mapping relationship, and the data forwarding between the source base station and the target base station is based on a PDU session, a sequence number SN status report is sent to the target base station, and the SN The status report carries the SN of the next PDU to be transmitted;

In the case that the first mapping relationship is the same as the second mapping relationship, and the data forwarding between the source base station and the target base station is based on the service data unit SDU, the sequence number SN status report is sent to the target base station. The SN status report carries the SN of the next PDU to be transmitted and the identification information of the quality of service flow corresponding to the SN of the next PDU to be transmitted.

Wherein, the sending the sequence number SN status report to the target base station includes:

In the case that the first mapping relationship is different from the second mapping relationship, and the SNs of multiple PDUs included in different radio data bearers of the source base station are duplicated, the PDUs included in at least one radio data bearer of the source base station are repeated Allocate SNs so that the SNs of PDUs included in different wireless data bearers of the source base station do not overlap;

A sequence number SN status report is sent to the target base station, where the SN status report carries the SN after the reassignment of the next PDU to be transmitted and the SN reassignment information.

Wherein, the sending the sequence number SN status report to the target base station includes:

In the case that the first mapping relationship is different from the second mapping relationship, and the SNs of PDUs included in different wireless data bearers of the target base station are discontinuous, a sequence number SN status report is sent to the target base station, and the SN status report The SN of the next to-be-transmitted PDU carried by different wireless data bearers of the target base station is carried.

An embodiment of the present invention further provides a handover control method, which is applied to a target base station, including:

receiving a handover request message sent by the source base station, where the handover request message carries the first mapping relationship between the quality of service flow of the source base station and the wireless data bearer;

Send a handover request confirmation message to the source base station, or send a handover rejection message to the source base station; the handover request confirmation message carries the first mapping relationship between the target base station using the quality of service flow and the wireless data bearer. One indication information or second indication information carrying the second mapping relationship between the quality of service flow of the target base station and the wireless data bearer; the handover rejection message is used to indicate that the target base station does not have a wireless data bearer that can meet the handover requirement.

Wherein, the handover request message also includes at least one of the following information:

The identification information of the quality of service flow;

Reflect the configuration information of the quality of service flow and the wireless data bearer mapping;

And, the configuration information of the mapping of the uplink quality of service flow and the wireless data bearer.

Wherein, the handover request message further includes:

PDU session-based data forwarding proposal; or,

Data fronthaul proposal based on wireless data bearer; or,

Data forwarding proposal based on quality of service flow.

Wherein, when the handover request message includes a PDU session-based data forwarding proposal, the handover request confirmation message further includes: address information of the first data forwarding tunnel allocated by the target base station for the PDU session;

The method also includes:

Receive a data packet forwarded by the source base station on the first data forwarding tunnel, wherein each data packet forwarded on the first data forwarding tunnel carries identification information of a quality of service flow.

Wherein, when the handover request message includes a data forwarding proposal based on the wireless data bearer, the handover request confirmation message further includes: address information of the second data forwarding tunnel allocated by the target base station for the wireless data bearer;

When the handover request message includes a data forwarding proposal based on the quality of service flow, the handover request confirmation message further includes: address information of a third data forwarding tunnel allocated by the target base station for the quality of service flow.

Wherein, the method also includes:

After sending the handover request confirmation message to the source base station, receive the sequence number SN status report sent by the source base station.

An embodiment of the present invention further provides a handover control device, which is applied to a source base station, including:

a request sending module, configured to send a handover request message to the target base station, where the handover request message carries a first mapping relationship between the quality of service flow of the source base station and the wireless data bearer;

a receiving module, configured to receive a handover request confirmation message sent by the target base station, or receive a handover rejection message sent by the target base station; the handover request confirmation message carries the first mapping between the quality of service flow used by the target base station and the wireless data bearer The first indication information of the relationship or the second indication information that is used to indicate the second mapping relationship between the quality of service flow of the target base station and the wireless data bearer; the handover rejection message is used to indicate that the target base station does not have wireless data that can meet the handover requirement. bear.

An embodiment of the present invention further provides a base station, including a processor and a transceiver, the base station is a source base station currently accessed by a terminal, and the processor is configured to control the transceiver to perform the following processes:

sending a handover request message to the target base station, where the handover request message carries the first mapping relationship between the quality of service flow of the source base station and the wireless data bearer;

Receive a handover request confirmation message sent by the target base station, or receive a handover rejection message sent by the target base station; the handover request confirmation message carries a first indication of the first mapping relationship between the quality of service flow and the wireless data bearer used by the target base station information or carrying second indication information used to indicate the second mapping relationship between the quality of service flow of the target base station and the wireless data bearer; the handover rejection message is used to indicate that the target base station does not have a wireless data bearer that can meet the handover requirement.

Wherein, the handover request message also includes at least one of the following information:

The identification information of the quality of service flow;

Reflect the configuration information of the quality of service flow and the wireless data bearer mapping;

And, the configuration information of the mapping of the uplink quality of service flow and the wireless data bearer.

Wherein, the handover request message further includes:

PDU session-based data forwarding proposal; or,

Data fronthaul proposal based on wireless data bearer; or,

Data forwarding proposal based on quality of service flow.

Wherein, when the handover request message includes a PDU session-based data forwarding proposal, the handover request confirmation message further includes: address information of the first data forwarding tunnel allocated by the target base station for the PDU session;

The processor is also used to:

According to the address information of the first data forwarding tunnel, data packets are forwarded to the target base station on the first data forwarding tunnel, wherein each data packet forwarded on the first data forwarding tunnel carries a service Identification information for the mass flow.

Wherein, when the handover request message includes a data forwarding proposal based on the wireless data bearer, the handover request confirmation message further includes: address information of the second data forwarding tunnel allocated by the target base station for the wireless data bearer;

When the handover request message includes a data forwarding proposal based on the quality of service flow, the handover request confirmation message further includes: address information of a third data forwarding tunnel allocated by the target base station for the quality of service flow.

Wherein, the processor is also used for:

After receiving the handover request confirmation message sent by the target base station, a handover command instructing the terminal to switch to the target base station is sent to the terminal, and a sequence number SN status report is sent to the target base station.

Wherein, the transceiver is also used for:

When the first mapping relationship is the same as the second mapping relationship, and the data forwarding between the source base station and the target base station is based on a PDU session, a sequence number SN status report is sent to the target base station, and the SN The status report carries the SN of the next PDU to be transmitted;

In the case that the first mapping relationship is the same as the second mapping relationship, and the data forwarding between the source base station and the target base station is based on the service data unit SDU, the sequence number SN status report is sent to the target base station. The SN status report carries the SN of the next PDU to be transmitted and the identification information of the quality of service flow corresponding to the SN of the next PDU to be transmitted.

Wherein, the processor is also used for:

In the case that the first mapping relationship is different from the second mapping relationship, and the SNs of multiple PDUs included in different radio data bearers of the source base station are duplicated, the PDUs included in at least one radio data bearer of the source base station are repeated Allocate SNs so that the SNs of PDUs included in different wireless data bearers of the source base station do not overlap;

A sequence number SN status report is sent to the target base station, where the SN status report carries the SN after the reassignment of the next PDU to be transmitted and the SN reassignment information.

Wherein, the transceiver is also used for:

In the case that the first mapping relationship is different from the second mapping relationship, and the SNs of PDUs included in different wireless data bearers of the target base station are discontinuous, a sequence number SN status report is sent to the target base station, and the SN status report The SN of the next to-be-transmitted PDU carried by different wireless data bearers of the target base station is carried.

An embodiment of the present invention further provides a handover control device, which is applied to a target base station, including:

a request receiving module, configured to receive a handover request message sent by the source base station, where the handover request message carries the first mapping relationship between the quality of service flow of the source base station and the wireless data bearer;

A sending module, configured to send a handover request confirmation message to the source base station, or send a handover rejection message to the source base station; the handover request confirmation message carries the first information about the quality of service flow used by the target base station and the wireless data bearer. The first indication information of a mapping relationship or the second indication information carrying the second indication information used to indicate the second mapping relationship between the quality of service flow of the target base station and the wireless data bearer; the handover rejection message is used to indicate that the target base station does not have any data that can meet the handover requirement. Wireless data bearer.

An embodiment of the present invention further provides a base station, including a processor and a transceiver, the base station is a target base station to be handed over by a terminal, and the processor is configured to control the transceiver to perform the following processes:

receiving a handover request message sent by the source base station, where the handover request message carries the first mapping relationship between the quality of service flow of the source base station and the wireless data bearer;

Send a handover request confirmation message to the source base station, or send a handover rejection message to the source base station; the handover request confirmation message carries the first mapping relationship between the target base station using the quality of service flow and the wireless data bearer. One indication information or second indication information carrying the second mapping relationship between the quality of service flow of the target base station and the wireless data bearer; the handover rejection message is used to indicate that the target base station does not have a wireless data bearer that can meet the handover requirement.

Wherein, the handover request message also includes at least one of the following information:

The identification information of the quality of service flow;

Reflect the configuration information of the quality of service flow and the wireless data bearer mapping;

And, the configuration information of the mapping of the uplink quality of service flow and the wireless data bearer.

Wherein, the handover request message further includes:

PDU session-based data forwarding proposal; or,

Data fronthaul proposal based on wireless data bearer; or,

Data forwarding proposal based on quality of service flow.

Wherein, when the handover request message includes a PDU session-based data forwarding proposal, the handover request confirmation message further includes: address information of the first data forwarding tunnel allocated by the target base station for the PDU session;

The processor is also used to:

Receive a data packet forwarded by the source base station on the first data forwarding tunnel, wherein each data packet forwarded on the first data forwarding tunnel carries identification information of a quality of service flow.

Wherein, when the handover request message includes a data forwarding proposal based on the wireless data bearer, the handover request confirmation message further includes: address information of the second data forwarding tunnel allocated by the target base station for the wireless data bearer;

When the handover request message includes a data forwarding proposal based on the quality of service flow, the handover request confirmation message further includes: address information of a third data forwarding tunnel allocated by the target base station for the quality of service flow.

Wherein, the transceiver is also used for:

After sending the handover request confirmation message to the source base station, receive the sequence number SN status report sent by the source base station.

Embodiments of the present invention further provide a computer-readable storage medium on which a computer program is stored, characterized in that, when the program is executed by a processor, the steps in the above switching control method are implemented.

The above-mentioned technical scheme of the present invention has at least the following beneficial effects:

In the handover control method, device and base station of the embodiments of the present invention, the target base station obtains the second mapping relationship between the quality of service flow of the target base station and the wireless data bearer through the handover request confirmation message, and according to the quality of service flow of the source base station and the wireless data bearer The first mapping relationship and the second mapping relationship are sent to the target base station for an SN status report, so that the target base station uses the same SN to ensure the continuity of data transmission and achieve lossless handover between base stations.

Description of drawings

FIG. 1 shows one of the flow charts of the steps of a handover control method provided by an embodiment of the present invention;

FIG. 2 shows one of the signaling diagrams of negotiation between base stations in the handover control method provided by the embodiment of the present invention;

FIG. 3 shows the second negotiation signaling diagram between base stations in the handover control method provided by the embodiment of the present invention;

FIG. 4 shows a schematic diagram of a scheme 1 of data forward transmission in the handover control method provided by the embodiment of the present invention;

FIG. 5 shows a schematic diagram of a second scheme of data forward transmission in the handover control method provided by the embodiment of the present invention;

FIG. 6 shows a schematic diagram of a third scheme of data forward transmission in the handover control method provided by the embodiment of the present invention;

FIG. 7 shows a schematic diagram of scenario 1 of SN status report in the handover control method provided by the embodiment of the present invention;

FIG. 8 is a schematic diagram of scenario 2 of the SN status report in the handover control method provided by the embodiment of the present invention;

FIG. 9 is a schematic diagram of scenario three of the SN status report in the handover control method provided by the embodiment of the present invention;

FIG. 10 shows the second flowchart of the steps of the handover control method provided by the embodiment of the present invention;

FIG. 11 shows one of the schematic structural diagrams of the switching control apparatus provided by the embodiment of the present invention;

FIG. 12 shows a schematic structural diagram of a base station provided by an embodiment of the present invention;

FIG. 13 shows the second schematic structural diagram of the switching control apparatus provided by the embodiment of the present invention.

Detailed ways

In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, the following will be described in detail with reference to the accompanying drawings and specific embodiments.

As shown in FIG. 1 , an embodiment of the present invention provides a handover control method, which is applied to a source base station, including:

Step 11: Send a handover request message to the target base station, where the handover request message carries the first mapping relationship between the quality of service flow of the source base station and the wireless data bearer.

Preferably, step 11 is performed only when the source base station determines to hand over the terminal to the target base station.

Step 12: Receive a handover request confirmation message sent by the target base station, or receive a handover rejection message sent by the target base station; the handover request confirmation message carries the first mapping relationship between the quality of service flow used by the target base station and the wireless data bearer. The first indication information or the second indication information carrying the second mapping relationship between the quality of service flow of the target base station and the wireless data bearer; the handover rejection message is used to indicate that the target base station does not have a wireless data bearer that can meet the handover requirement.

In the above-mentioned embodiment of the present invention, steps 11 and 12 are the handover negotiation mechanism between base stations in the accurate handover stage based on the quality of service (QoS) flow granularity, mainly including two cases, case 1: the target base station rejects; case 2: the target base station accepts .

Specifically, for the first case, as shown in FIG. 2 , the source base station makes a handover decision according to the measurement report reported by the terminal, and when the source base station determines to switch the terminal to the target base station, it sends a handover request message to the target base station , after receiving the handover request message, the target base station determines that none of the radio data bearer DRBs meets the requirement, and then sends a handover rejection message to the source base station.

Wherein, no DRB meets the requirement specifically refers to no non-GBR (non-Guaranteed Bit Rate, no guaranteed bit rate) type DRB meets the requirement.

Preferably, the handover request message sent by the source base station further includes at least one of the following information:

The identification information QFI of the quality of service flow;

Configuration information of reflective QoS flow and radio data bearer mapping (DRB);

And, configuration information for mapping an uplink quality of service flow (UL QoS flow) to a radio data bearer (DRB).

Specifically, for the second case, as shown in FIG. 3 , the source base station makes a handover decision according to the measurement report reported by the terminal, and when the source base station determines to switch the terminal to the target base station, it sends a handover request message to the target base station , after receiving the handover request message, the target base station determines that there is a DRB that meets the conditions, and sends a handover request confirmation message to the source base station.

Preferably, the handover request confirmation message may directly carry the second mapping relationship between the quality of service flow of the target base station and the wireless data bearer, or may carry other information to indicate the second mapping relationship. In a specific application, if the second mapping relationship is the same as the first mapping relationship, generally the second mapping relationship or the indication information indicating the second mapping relationship may not be carried in the handover request confirmation message. After the source base station receives the handover request confirmation message, if If the handover request confirmation message does not carry the information related to the second mapping relationship, the default target base station uses the same mapping relationship as the source base station.

Preferably, the handover request message sent by the source base station further includes at least one of the following information:

The identification information QFI of the quality of service flow;

Configuration information of reflective QoS flow and radio data bearer mapping (DRB);

And, configuration information for mapping an uplink quality of service flow (UL QoS flow) to a radio data bearer (DRB).

Correspondingly, the handover request confirmation message sent by the target base station also includes at least one of the following information:

Configuration information of reflective QoS flow and radio data bearer mapping (DRB);

And, configuration information for mapping an uplink quality of service flow (UL QoS flow) to a radio data bearer (DRB).

Further, in order to realize lossless handover between base stations, the embodiment of the present invention also provides a data forward transmission scheme between base stations. Specifically, the handover request message further includes:

PDU session-based data forwarding proposal; or,

Data fronthaul proposal based on wireless data bearer; or,

Data forwarding proposal based on quality of service flow.

The embodiments of the present invention provide three data forwarding schemes, including: scheme 1, a data forwarding scheme based on PDU session granularity; scheme 2, a data forwarding scheme based on DRB granularity; scheme 3, a data forwarding scheme based on QoS flow granularity.

As shown in FIG. 4 , for scheme 1: the target base station establishes a first data forwarding tunnel (GTP tunnel) with a PDU session as the granularity; that is, when the handover request message includes a PDU session-based data forwarding proposal, the handover The request confirmation message further includes: address information of the first data fronthaul tunnel allocated by the target base station for the PDU session; each first data fronthaul tunnel includes multiple QoS Flows mapped to multiple DRBs.

Under this scheme, the method further includes:

According to the address information of the first data forwarding tunnel, data packets are forwarded to the target base station on the first data forwarding tunnel, wherein each data packet forwarded on the first data forwarding tunnel carries a service Identification information for the mass flow. For example, the identification information of the quality of service flow (ie, QoS flow ID information) is added to the header of the first data forwarding tunnel for each data packet of the first data forwarding tunnel.

As shown in FIG. 5 , for scheme 2: the target base station establishes a second data fronthaul tunnel (GTP tunnel) with DRB as the granularity, that is, in the case that the handover request message includes a wireless data bearer-based data fronthaul proposal, the handover The request confirmation message further includes: address information of the second data fronthaul tunnel allocated by the target base station for the wireless data bearer; each second data fronthaul tunnel includes multiple QoS Flows.

In this solution, no additional identification information indicating QoS Flow is required, but the source base station needs to be informed of the second mapping relationship between the QoS flow of the target base station and the radio bearer through a handover request confirmation message.

As shown in FIG. 6 , for solution three: the target base station establishes a third data fronthaul tunnel with a QoS flow as the granularity, and each QoS flow establishes a third data fronthaul tunnel. That is, when the handover request message includes a data forwarding proposal based on the quality of service flow, the handover request confirmation message further includes: address information of the third data forwarding tunnel allocated by the target base station for the quality of service flow. In this solution, no additional identification information indicating QoS Flow is required.

Further, the embodiment of the present invention further provides corresponding lossless handover modes according to various mapping situations of the QoS flows of the source base station and the target base station to the DRB.

Further, in the above-mentioned embodiment of the present invention, the method further includes:

After receiving the handover request confirmation message sent by the target base station, a handover command instructing the terminal to switch to the target base station is sent to the terminal, and a sequence number SN status report is sent to the target base station.

That is, after the source base station receives the handover request confirmation message sent by the target base station, it sends a handover command to the terminal to instruct the terminal to switch to the target base station, and sends a sequence number SN status report to the target base station according to the first mapping relationship and the second mapping relationship, wherein , the SN status report carries the SN of the next protocol data unit PDU to be transmitted.

On the one hand, as shown in FIG. 7 , when the first mapping relationship is the same as the second mapping relationship, and the data forwarding between the source base station and the target base station is based on a PDU session, send the data to the target base station. Sequence number SN status report, the SN status report carries the SN of the next PDU to be transmitted;

Or, as shown in FIG. 7 , in the case that the first mapping relationship is the same as the second mapping relationship, and the data forwarding between the source base station and the target base station is based on the service data unit SDU, send the data to the target base station A sequence number SN status report is sent, where the SN status report carries the SN of the next PDU to be transmitted and the identification information of the quality of service flow corresponding to the SN of the next PDU to be transmitted.

On the other hand, in the case that the first mapping relationship is different from the second mapping relationship, and the SNs of multiple PDUs included in different radio data bearers of the source base station are duplicated, it is at least one radio data bearer of the source base station. The included PDUs are reassigned SNs, so that the SNs of the PDUs included in different wireless data bearers of the source base station are not duplicated;

A sequence number SN status report is sent to the target base station, where the SN status report carries the SN after the reassignment of the next PDU to be transmitted and the SN reassignment information.

As shown in Figure 8, this situation is applicable to the scenario where different QoS Flows of the source base station are mapped to different DRBs, and the target base station is mapped to the same DRB. lead to data loss. The source base station reassigns the allocated SN, for example, source PDU2->target PDU5, source PDU3->target PDU6, and the corresponding information needs to be transmitted in the SN status report.

The reassignment information of the SN may specifically be: the reassignment principle of the SN, the correspondence between the SN after the reassignment and the source SN, etc. For example, as shown in Figure 8, the SN number of the PDU with the assigned SN number in QoS Flow2 starts from the last of QoS Flow1. A SN number +1 starts.

In short, the target base station can determine the correspondence between the source SN and the SN of the target base station according to the SN reassignment information, so as to realize the continuity of data transmission and avoid data loss.

On the other hand, when the first mapping relationship is different from the second mapping relationship, and the SNs of PDUs included in different radio data bearers of the target base station are discontinuous, a sequence number SN status report is sent to the target base station. The SN status report carries the SN of the next to-be-transmitted PDU of different wireless data bearers of the target base station. As shown in FIG. 9 , the SN status report includes the following contents: the SN of the next PDU of DRB1; and the SN of the next PDU of DRB2.

As shown in Figure 9, this situation is applicable to the scenario where different QoS Flows of the base station are mapped to the same DRB, and different QoS Flows of the target base station are mapped to different DRBs. In this scenario, there may be a problem of discontinuous SN numbers within the DRB of the target base station. Knowing whether packets with discontinuous SN numbers are lost or has been allocated another DRB for transmission may trigger a PDCP (Packet Data Convergence Protocol) status report on the terminal side. At this time, the target base station can determine that the packet has been transmitted in another DRB. , no additional action is required.

To sum up, the above-mentioned embodiments of the present invention provide a mode of interaction between the source base station and the target base station through the interface between the base stations in the handover preparation stage, a lossless handover mode in the case of multiple mappings of the QoS flow of the source base station and the target base station to the DRB, and the source base station. The data fronthauler method with the target base station based on PDU session, DRB and QoS flow granularity can solve the problem of lossless handover between the source base station and the target base station QoS flow to the base station in different mappings in the 5G system.

As shown in FIG. 10 , an embodiment of the present invention further provides a handover control method, which is applied to a target base station, including:

Step 101: Receive a handover request message sent by a source base station, where the handover request message carries a first mapping relationship between a quality of service flow of the source base station and a wireless data bearer;

Step 102: Send a handover request confirmation message to the source base station, or send a handover rejection message to the source base station; the handover request confirmation message carries the first mapping between the quality of service flow used by the target base station and the wireless data bearer The first indication information of the relationship or the second indication information that is used to indicate the second mapping relationship between the quality of service flow of the target base station and the wireless data bearer; the handover rejection message is used to indicate that the target base station does not have wireless data that can meet the handover requirement. bear.

In the above-mentioned embodiment of the present invention, step 101 and step 102 are the handover negotiation mechanism between base stations based on the quality of service QoS flow granularity in the handover accurate stage, mainly including two cases, case 1: the target base station rejects; case 2: the target base station accepts .

Specifically, for the first case, as shown in FIG. 2 , the source base station makes a handover decision according to the measurement report reported by the terminal, and when the source base station determines to switch the terminal to the target base station, it sends a handover request message to the target base station , after receiving the handover request message, the target base station determines that none of the radio data bearer DRBs meets the requirement, and then sends a handover rejection message to the source base station.

Wherein, no DRB meets the requirement specifically refers to no non-GBR (non-Guaranteed Bit Rate, no guaranteed bit rate) type DRB meets the requirement.

Preferably, the handover request message sent by the source base station further includes at least one of the following information:

The identification information QFI of the quality of service flow;

Configuration information of reflective QoS flow and radio data bearer mapping (DRB);

And, configuration information for mapping an uplink quality of service flow (UL QoS flow) to a radio data bearer (DRB).

Specifically, for the second case, as shown in FIG. 3 , the source base station makes a handover decision according to the measurement report reported by the terminal, and when the source base station determines to switch the terminal to the target base station, it sends a handover request message to the target base station , after receiving the handover request message, the target base station determines that there is a DRB that meets the conditions, and sends a handover request confirmation message to the source base station.

Preferably, the handover request confirmation message may directly carry the second mapping relationship between the quality of service flow of the target base station and the wireless data bearer, or may carry other information to indicate the second mapping relationship. In a specific application, if the second mapping relationship is the same as the first mapping relationship, generally the second mapping relationship or the indication information indicating the second mapping relationship may not be carried in the handover request confirmation message. After the source base station receives the handover request confirmation message, if If the handover request confirmation message does not carry the information related to the second mapping relationship, the default target base station uses the same mapping relationship as the source base station.

Preferably, the handover request message sent by the source base station further includes at least one of the following information:

The identification information QFI of the quality of service flow;

Configuration information of reflective QoS flow and radio data bearer mapping (DRB);

And, configuration information for mapping an uplink quality of service flow (UL QoS flow) to a radio data bearer (DRB).

Correspondingly, the handover request confirmation message sent by the target base station also includes at least one of the following information:

Configuration information of reflective QoS flow and radio data bearer mapping (DRB);

And, configuration information for mapping an uplink quality of service flow (UL QoS flow) to a radio data bearer (DRB).

Further, in order to realize lossless handover between base stations, the embodiment of the present invention also provides a data forward transmission scheme between base stations. Specifically, the handover request message further includes:

PDU session-based data forwarding proposal; or,

Data fronthaul proposal based on wireless data bearer; or,

Data forwarding proposal based on quality of service flow.

The embodiments of the present invention provide three data forwarding schemes, including: scheme 1, a data forwarding scheme based on PDU session granularity; scheme 2, a data forwarding scheme based on DRB granularity; scheme 3, a data forwarding scheme based on QoS flow granularity.

As shown in FIG. 4 , for scheme 1: the target base station establishes a first data forwarding tunnel (GTP tunnel) with a PDU session as the granularity; that is, when the handover request message includes a PDU session-based data forwarding proposal, the handover The request confirmation message further includes: address information of the first data fronthaul tunnel allocated by the target base station for the PDU session; each first data fronthaul tunnel includes multiple QoS Flows mapped to multiple DRBs.

Under this scheme, the method further includes:

Receive a data packet forwarded by the source base station on the first data forwarding tunnel, wherein each data packet forwarded on the first data forwarding tunnel carries identification information of a quality of service flow. For example, identification information (ie, QoS flowID information) of the quality of service flow is added to the header of the first data forwarding tunnel for each data packet of the first data forwarding tunnel.

As shown in FIG. 5 , for scheme 2: the target base station establishes a second data fronthaul tunnel (GTP tunnel) with DRB as the granularity, that is, in the case that the handover request message includes a wireless data bearer-based data fronthaul proposal, the handover The request confirmation message further includes: address information of the second data fronthaul tunnel allocated by the target base station for the wireless data bearer; each second data fronthaul tunnel includes multiple QoS Flows.

In this solution, no additional identification information indicating QoS Flow is required, but the source base station needs to be informed of the second mapping relationship between the QoS flow of the target base station and the radio bearer through a handover request confirmation message.

As shown in FIG. 6 , for solution three: the target base station establishes a third data fronthaul tunnel with a QoS flow as the granularity, and each QoS flow establishes a third data fronthaul tunnel. That is, when the handover request message includes a data forwarding proposal based on the quality of service flow, the handover request confirmation message further includes: address information of the third data forwarding tunnel allocated by the target base station for the quality of service flow. In this solution, no additional identification information indicating QoS Flow is required.

Further, the method also includes:

After sending the handover request confirmation message to the source base station, receive the sequence number SN status report sent by the source base station.

To sum up, the above-mentioned embodiments of the present invention provide a mode of interaction between the source base station and the target base station through the interface between the base stations in the handover preparation stage, and the data fronthauler mode of the source base station and the target base station based on PDU session, DRB and QoS flow granularity, which can solve the problem. In the 5G system, the source base station and the target base station QoS flow to the base station is different from the mapping lossless handover problem.

As shown in FIG. 11 , an embodiment of the present invention further provides a handover control apparatus, which is applied to a source base station, including:

a request sending module 111, configured to send a handover request message to the target base station, where the handover request message carries a first mapping relationship between the quality of service flow of the source base station and the wireless data bearer;

The receiving module 112 is configured to receive a handover request confirmation message sent by the target base station, or receive a handover rejection message sent by the target base station; the handover request confirmation message carries the first information about the quality of service flow used by the target base station and the wireless data bearer. The first indication information of the mapping relationship or the second indication information that carries the second mapping relationship used to indicate the quality of service flow of the target base station and the wireless data bearer; the handover rejection message is used to indicate that the target base station does not have a wireless radio that can meet the handover requirement data bearer.

To sum up, the above-mentioned embodiments of the present invention provide a mode of interaction between the source base station and the target base station through the interface between the base stations in the handover preparation stage, a lossless handover mode in the case of multiple mappings of the QoS flow of the source base station and the target base station to the DRB, and the source base station. The data fronthauler method with the target base station based on PDU session, DRB and QoS flow granularity can solve the problem of lossless handover between the source base station and the target base station QoS flow to the base station in different mappings in the 5G system.

It should be noted that the handover control device provided by the embodiment of the present invention is a device capable of executing the above handover control method, and all the above embodiments of the handover control method are applicable to the device, and can achieve the same or similar beneficial effects.

As shown in FIG. 12 , an embodiment of the present invention further provides a base station, including a processor 1200 and a transceiver 1210, where the base station is a source base station currently accessed by a terminal, and the processor 1200 is configured to control the transceiver 1210 Perform the following process:

sending a handover request message to the target base station, where the handover request message carries the first mapping relationship between the quality of service flow of the source base station and the wireless data bearer;

Receive a handover request confirmation message sent by the target base station, or receive a handover rejection message sent by the target base station; the handover request confirmation message carries a first indication of the first mapping relationship between the quality of service flow and the wireless data bearer used by the target base station information or carrying second indication information used to indicate the second mapping relationship between the quality of service flow of the target base station and the wireless data bearer; the handover rejection message is used to indicate that the target base station does not have a wireless data bearer that can meet the handover requirement.

Preferably, in the above-mentioned embodiment of the present invention, the handover request message further includes at least one of the following information:

The identification information of the quality of service flow;

Reflect the configuration information of the quality of service flow and the wireless data bearer mapping;

And, the configuration information of the mapping of the uplink quality of service flow and the wireless data bearer.

Preferably, in the above embodiment of the present invention, the handover request message further includes:

PDU session-based data forwarding proposal; or,

Data fronthaul proposal based on wireless data bearer; or,

Data forwarding proposal based on quality of service flow.

Preferably, in the above-mentioned embodiment of the present invention, when the handover request message includes a PDU session-based data forwarding proposal, the handover request confirmation message further includes: the first data forwarding allocated by the target base station for the PDU session. address information of the tunnel;

The processor 1200 is also used for:

According to the address information of the first data forwarding tunnel, data packets are forwarded to the target base station on the first data forwarding tunnel, wherein each data packet forwarded on the first data forwarding tunnel carries a service Identification information for the mass flow.

Preferably, in the above-mentioned embodiment of the present invention, in the case that the handover request message includes a data forwarding proposal based on the wireless data bearer, the handover request confirmation message further includes: the second target base station allocated for the wireless data bearer. address information of the data forwarding tunnel;

When the handover request message includes a data forwarding proposal based on the quality of service flow, the handover request confirmation message further includes: address information of a third data forwarding tunnel allocated by the target base station for the quality of service flow.

Preferably, in the above embodiment of the present invention, the processor 1200 is further configured to:

After receiving the handover request confirmation message sent by the target base station, a handover command instructing the terminal to switch to the target base station is sent to the terminal, and a sequence number SN status report is sent to the target base station.

Preferably, in the above-mentioned embodiment of the present invention, the transceiver 1210 is further used for:

When the first mapping relationship is the same as the second mapping relationship, and the data forwarding between the source base station and the target base station is based on a PDU session, a sequence number SN status report is sent to the target base station, and the SN The status report carries the SN of the next PDU to be transmitted;

In the case that the first mapping relationship is the same as the second mapping relationship, and the data forwarding between the source base station and the target base station is based on the service data unit SDU, the sequence number SN status report is sent to the target base station. The SN status report carries the SN of the next PDU to be transmitted and the identification information of the quality of service flow corresponding to the SN of the next PDU to be transmitted.

Preferably, in the above embodiment of the present invention, the processor 1200 is further configured to:

In the case that the first mapping relationship is different from the second mapping relationship, and the SNs of multiple PDUs included in different radio data bearers of the source base station are duplicated, the PDUs included in at least one radio data bearer of the source base station are repeated Allocate SNs so that the SNs of PDUs included in different wireless data bearers of the source base station do not overlap;

A sequence number SN status report is sent to the target base station, where the SN status report carries the SN after the reassignment of the next PDU to be transmitted and the SN reassignment information.

Preferably, in the above-mentioned embodiment of the present invention, the transceiver 1210 is further used for:

In the case that the first mapping relationship is different from the second mapping relationship, and the SNs of PDUs included in different wireless data bearers of the target base station are discontinuous, a sequence number SN status report is sent to the target base station, and the SN status report The SN of the next to-be-transmitted PDU carried by different wireless data bearers of the target base station is carried.

To sum up, the above-mentioned embodiments of the present invention provide a mode of interaction between the source base station and the target base station through the interface between the base stations in the handover preparation stage, a lossless handover mode in the case of multiple mappings of the QoS flow of the source base station and the target base station to the DRB, and the source base station. The data fronthauler method with the target base station based on PDU session, DRB and QoS flow granularity can solve the problem of lossless handover between the source base station and the target base station QoS flow to the base station in different mappings in the 5G system.

It should be noted that the base station provided by the embodiment of the present invention is a base station capable of executing the above handover control method, and all the above embodiments of the handover control method are applicable to the base station, and can achieve the same or similar beneficial effects.

As shown in FIG. 13 , an embodiment of the present invention further provides a handover control device, which is applied to a target base station, including:

The request receiving module 131 is configured to receive a handover request message sent by the source base station, where the handover request message carries the first mapping relationship between the quality of service flow of the source base station and the wireless data bearer;

The sending module 132 is configured to send a handover request confirmation message to the source base station, or send a handover rejection message to the source base station; the handover request confirmation message carries the information about the quality of service flow and the wireless data bearer used by the target base station. The first indication information of the first mapping relationship or the second indication information carrying the second mapping relationship used to indicate the quality of service flow of the target base station and the wireless data bearer; the handover rejection message is used to indicate that the target base station cannot meet the handover requirement wireless data bearer.

To sum up, the above-mentioned embodiments of the present invention provide a mode of interaction between the source base station and the target base station through the interface between the base stations in the handover preparation stage, and the data fronthauler mode of the source base station and the target base station based on PDU session, DRB and QoS flow granularity, which can solve the problem. In the 5G system, the source base station and the target base station QoS flow to the base station is different from the mapping lossless handover problem.

It should be noted that the handover control device provided by the embodiment of the present invention is a device capable of executing the above handover control method, and all the above embodiments of the handover control method are applicable to the device, and can achieve the same or similar beneficial effects.

As shown in FIG. 12 , an embodiment of the present invention further provides a base station, including a processor 1200 and a transceiver 1210, where the base station is a target base station to be handed over by a terminal, and the processor 1200 is configured to control the transceiver 1210 to execute Process as follows:

receiving a handover request message sent by the source base station, where the handover request message carries the first mapping relationship between the quality of service flow of the source base station and the wireless data bearer;

Send a handover request confirmation message to the source base station, or send a handover rejection message to the source base station; the handover request confirmation message carries the first mapping relationship between the target base station using the quality of service flow and the wireless data bearer. One indication information or second indication information carrying the second mapping relationship between the quality of service flow of the target base station and the wireless data bearer; the handover rejection message is used to indicate that the target base station does not have a wireless data bearer that can meet the handover requirement.

Preferably, in the above-mentioned embodiment of the present invention, the handover request message further includes at least one of the following information:

The identification information of the quality of service flow;

Reflect the configuration information of the quality of service flow and the wireless data bearer mapping;

And, the configuration information of the mapping of the uplink quality of service flow and the wireless data bearer.

Preferably, in the above embodiment of the present invention, the handover request message further includes:

PDU session-based data forwarding proposal; or,

Data fronthaul proposal based on wireless data bearer; or,

Data forwarding proposal based on quality of service flow.

Preferably, in the above-mentioned embodiment of the present invention, when the handover request message includes a PDU session-based data forwarding proposal, the handover request confirmation message further includes: the first data forwarding allocated by the target base station for the PDU session. address information of the tunnel;

The processor 1200 is also used for:

Receive a data packet forwarded by the source base station on the first data forwarding tunnel, wherein each data packet forwarded on the first data forwarding tunnel carries identification information of a quality of service flow.

Preferably, in the above-mentioned embodiment of the present invention, in the case that the handover request message includes a data forwarding proposal based on the wireless data bearer, the handover request confirmation message further includes: the second target base station allocated for the wireless data bearer. address information of the data forwarding tunnel;

When the handover request message includes a data forwarding proposal based on the quality of service flow, the handover request confirmation message further includes: address information of a third data forwarding tunnel allocated by the target base station for the quality of service flow.

Preferably, in the above-mentioned embodiment of the present invention, the transceiver 1210 is further used for:

After sending the handover request confirmation message to the source base station, receive the sequence number SN status report sent by the source base station.

To sum up, the above-mentioned embodiments of the present invention provide a mode of interaction between the source base station and the target base station through the interface between the base stations in the handover preparation stage, and the data fronthauler mode of the source base station and the target base station based on PDU session, DRB and QoS flow granularity, which can solve the problem. In the 5G system, the source base station and the target base station QoS flow to the base station is different from the mapping lossless handover problem.

It should be noted that the base station provided by the embodiment of the present invention is a base station capable of executing the above handover control method, and all the above embodiments of the handover control method are applicable to the base station, and can achieve the same or similar beneficial effects.

Embodiments of the present invention further provide a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, each process in the above-mentioned embodiments of the switching control method can be implemented, and the same technical effect can be achieved. , in order to avoid repetition, it will not be repeated here. The computer-readable storage medium is, for example, a read-only memory (Read-Only Memory, ROM for short), a random access memory (Random Access Memory, RAM for short), a magnetic disk, or an optical disk.

As will be appreciated by one skilled in the art, the embodiments of the present application may be provided as a method, a system or a computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-readable storage media having computer-usable program code embodied therein, including but not limited to disk storage, optical storage, and the like.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the present application. It will be understood that each flow and/or block in the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in a flow or flow and/or a block or blocks of the flowchart.

These computer program instructions may also be stored in a computer-readable storage medium capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce a paper product comprising the instruction means, The instruction means implements the functions specified in the flow or flows of the flowcharts and/or the block or blocks of the block diagrams.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing the computer or other programmable device to perform a series of operational steps to produce a computer-implemented process, thereby causing the instructions to be executed on the computer or other programmable data processing device Steps are provided for implementing the functions specified in a flow or flows of the flowcharts and/or a block or blocks of the block diagrams.

The above are the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can be made. These improvements and modifications It should also be regarded as the protection scope of the present invention.

Claims (33)

1. A handover control method, applied to a source base station, is characterized in that, comprising: sending a handover request message to the target base station, where the handover request message carries the first mapping relationship between the quality of service flow of the source base station and the wireless data bearer; Receive a handover request confirmation message sent by the target base station, or receive a handover rejection message sent by the target base station; the handover request confirmation message carries a first indication of the first mapping relationship between the quality of service flow and the wireless data bearer used by the target base station information or carrying second indication information used to indicate the second mapping relationship between the quality of service flow of the target base station and the wireless data bearer; the handover rejection message is used to indicate that the target base station does not have a wireless data bearer that can meet the handover requirement. 2. The method according to claim 1, wherein the handover request message further comprises at least one of the following information: The identification information of the quality of service flow; Reflect the configuration information of the quality of service flow and the wireless data bearer mapping; And, the configuration information of the mapping of the uplink quality of service flow and the wireless data bearer. 3. The method according to claim 1, wherein the handover request message further comprises: PDU session-based data forwarding proposal; or, Data fronthaul proposal based on wireless data bearer; or, Data forwarding proposal based on quality of service flow. 4. The method according to claim 3, wherein, in the case that the handover request message includes a data forwarding proposal based on a PDU session, the handover request confirmation message further comprises: the first number allocated by the target base station for the PDU session. 1. address information of the data forwarding tunnel; The method also includes: According to the address information of the first data forwarding tunnel, data packets are forwarded to the target base station on the first data forwarding tunnel, wherein each data packet forwarded on the first data forwarding tunnel carries a service Identification information for the mass flow. 5. The method of claim 3, wherein When the handover request message includes a data forwarding proposal based on the wireless data bearer, the handover request confirmation message further includes: address information of the second data forwarding tunnel allocated by the target base station for the wireless data bearer; When the handover request message includes a data forwarding proposal based on the quality of service flow, the handover request confirmation message further includes: address information of a third data forwarding tunnel allocated by the target base station for the quality of service flow. 6. The method of claim 1, wherein the method further comprises: After receiving the handover request confirmation message sent by the target base station, a handover command instructing the terminal to switch to the target base station is sent to the terminal, and a sequence number SN status report is sent to the target base station. 7. The method according to claim 6, wherein the sending a sequence number SN status report to the target base station comprises: When the first mapping relationship is the same as the second mapping relationship, and the data forwarding between the source base station and the target base station is based on a PDU session, a sequence number SN status report is sent to the target base station, and the SN The status report carries the SN of the next PDU to be transmitted; In the case that the first mapping relationship is the same as the second mapping relationship, and the data forwarding between the source base station and the target base station is based on the service data unit SDU, the sequence number SN status report is sent to the target base station. The SN status report carries the SN of the next PDU to be transmitted and the identification information of the quality of service flow corresponding to the SN of the next PDU to be transmitted. 8. The method according to claim 6, wherein the sending a sequence number SN status report to the target base station comprises: In the case that the first mapping relationship is different from the second mapping relationship, and the SNs of multiple PDUs included in different radio data bearers of the source base station are duplicated, the PDUs included in at least one radio data bearer of the source base station are repeated Allocate SNs so that the SNs of PDUs included in different wireless data bearers of the source base station do not overlap; A sequence number SN status report is sent to the target base station, where the SN status report carries the SN after the reassignment of the next PDU to be transmitted and the SN reassignment information. 9. The method according to claim 6, wherein the sending a sequence number SN status report to the target base station comprises: In the case that the first mapping relationship is different from the second mapping relationship, and the SNs of PDUs included in different wireless data bearers of the target base station are discontinuous, a sequence number SN status report is sent to the target base station, and the SN status report The SN of the next to-be-transmitted PDU carried by different wireless data bearers of the target base station is carried. 10. A handover control method, applied to a target base station, characterized by comprising: receiving a handover request message sent by the source base station, where the handover request message carries the first mapping relationship between the quality of service flow of the source base station and the wireless data bearer; Send a handover request confirmation message to the source base station, or send a handover rejection message to the source base station; the handover request confirmation message carries the first mapping relationship between the target base station using the quality of service flow and the wireless data bearer. One indication information or second indication information carrying the second mapping relationship between the quality of service flow of the target base station and the wireless data bearer; the handover rejection message is used to indicate that the target base station does not have a wireless data bearer that can meet the handover requirement. 11. The method according to claim 10, wherein the handover request message further comprises at least one of the following information: The identification information of the quality of service flow; Reflect the configuration information of the quality of service flow and the wireless data bearer mapping; And, the configuration information of the mapping of the uplink quality of service flow and the wireless data bearer. 12. The method according to claim 10, wherein the handover request message further comprises: PDU session-based data forwarding proposal; or, Data fronthaul proposal based on wireless data bearer; or, Data forwarding proposal based on quality of service flow. 13 . The method according to claim 12 , wherein, when the handover request message includes a data forwarding proposal based on a PDU session, the handover request confirmation message further includes: the first number allocated by the target base station for the PDU session. 14 . 1. address information of the data forwarding tunnel; The method also includes: Receive a data packet forwarded by the source base station on the first data forwarding tunnel, wherein each data packet forwarded on the first data forwarding tunnel carries identification information of a quality of service flow. 14. The method of claim 12, wherein When the handover request message includes a data forwarding proposal based on the wireless data bearer, the handover request confirmation message further includes: address information of the second data forwarding tunnel allocated by the target base station for the wireless data bearer; When the handover request message includes a data forwarding proposal based on the quality of service flow, the handover request confirmation message further includes: address information of a third data forwarding tunnel allocated by the target base station for the quality of service flow. 15. The method of claim 10, wherein the method further comprises: After sending the handover request confirmation message to the source base station, receive the sequence number SN status report sent by the source base station. 16. A handover control device, applied to a source base station, characterized by comprising: a request sending module, configured to send a handover request message to the target base station, where the handover request message carries a first mapping relationship between the quality of service flow of the source base station and the wireless data bearer; a receiving module, configured to receive a handover request confirmation message sent by the target base station, or receive a handover rejection message sent by the target base station; the handover request confirmation message carries the first mapping between the quality of service flow used by the target base station and the wireless data bearer The first indication information of the relationship or the second indication information that is used to indicate the second mapping relationship between the quality of service flow of the target base station and the wireless data bearer; the handover rejection message is used to indicate that the target base station does not have wireless data that can meet the handover requirement. bear. 17. A base station, comprising a processor and a transceiver, the base station being a source base station currently accessed by a terminal, wherein the processor is configured to control the transceiver to perform the following process: sending a handover request message to the target base station, where the handover request message carries the first mapping relationship between the quality of service flow of the source base station and the wireless data bearer; Receive a handover request confirmation message sent by the target base station, or receive a handover rejection message sent by the target base station; the handover request confirmation message carries a first indication of the first mapping relationship between the quality of service flow and the wireless data bearer used by the target base station information or carrying second indication information used to indicate the second mapping relationship between the quality of service flow of the target base station and the wireless data bearer; the handover rejection message is used to indicate that the target base station does not have a wireless data bearer that can meet the handover requirement. 18. The base station according to claim 17, wherein the handover request message further comprises at least one of the following information: The identification information of the quality of service flow; Reflect the configuration information of the quality of service flow and the wireless data bearer mapping; And, the configuration information of the mapping of the uplink quality of service flow and the wireless data bearer. 19. The base station according to claim 17, wherein the handover request message further comprises: PDU session-based data forwarding proposal; or, Data fronthaul proposal based on wireless data bearer; or, Data forwarding proposal based on quality of service flow. 20 . The base station according to claim 19 , wherein, when the handover request message includes a data forwarding proposal based on a PDU session, the handover request confirmation message further comprises: the first data allocated by the target base station for the PDU session. 21 . 1. address information of the data forwarding tunnel; The processor is also used to: According to the address information of the first data forwarding tunnel, data packets are forwarded to the target base station on the first data forwarding tunnel, wherein each data packet forwarded on the first data forwarding tunnel carries a service Identification information for the mass flow. 21. The base station of claim 19, wherein, When the handover request message includes a data forwarding proposal based on the wireless data bearer, the handover request confirmation message further includes: address information of the second data forwarding tunnel allocated by the target base station for the wireless data bearer; When the handover request message includes a data forwarding proposal based on the quality of service flow, the handover request confirmation message further includes: address information of a third data forwarding tunnel allocated by the target base station for the quality of service flow. 22. The base station of claim 17, wherein the processor is further configured to: After receiving the handover request confirmation message sent by the target base station, a handover command instructing the terminal to switch to the target base station is sent to the terminal, and a sequence number SN status report is sent to the target base station. 23. The base station according to claim 22, wherein the transceiver is further configured to: When the first mapping relationship is the same as the second mapping relationship, and the data forwarding between the source base station and the target base station is based on a PDU session, a sequence number SN status report is sent to the target base station, and the SN The status report carries the SN of the next PDU to be transmitted; In the case that the first mapping relationship is the same as the second mapping relationship, and the data forwarding between the source base station and the target base station is based on the service data unit SDU, the sequence number SN status report is sent to the target base station. The SN status report carries the SN of the next PDU to be transmitted and the identification information of the quality of service flow corresponding to the SN of the next PDU to be transmitted. 24. The base station according to claim 22, wherein the processor is further configured to: In the case that the first mapping relationship is different from the second mapping relationship, and the SNs of multiple PDUs included in different radio data bearers of the source base station are duplicated, the PDUs included in at least one radio data bearer of the source base station are repeated Allocate SNs so that the SNs of PDUs included in different wireless data bearers of the source base station do not overlap; A sequence number SN status report is sent to the target base station, where the SN status report carries the SN after the reassignment of the next PDU to be transmitted and the SN reassignment information. 25. The base station of claim 22, wherein the transceiver is further configured to: In the case that the first mapping relationship is different from the second mapping relationship, and the SNs of PDUs included in different wireless data bearers of the target base station are discontinuous, a sequence number SN status report is sent to the target base station, and the SN status report The SN of the next to-be-transmitted PDU carried by different wireless data bearers of the target base station is carried. 26. A handover control device, applied to a target base station, characterized by comprising: a request receiving module, configured to receive a handover request message sent by the source base station, where the handover request message carries the first mapping relationship between the quality of service flow of the source base station and the wireless data bearer; A sending module, configured to send a handover request confirmation message to the source base station, or send a handover rejection message to the source base station; the handover request confirmation message carries the first information about the quality of service flow used by the target base station and the wireless data bearer. The first indication information of a mapping relationship or the second indication information carrying the second indication information used to indicate the second mapping relationship between the quality of service flow of the target base station and the wireless data bearer; the handover rejection message is used to indicate that the target base station does not have any data that can meet the handover requirement. Wireless data bearer. 27. A base station, comprising a processor and a transceiver, the base station being a target base station to be handed over by a terminal, wherein the processor is configured to control the transceiver to perform the following process: receiving a handover request message sent by the source base station, where the handover request message carries the first mapping relationship between the quality of service flow of the source base station and the wireless data bearer; Send a handover request confirmation message to the source base station, or send a handover rejection message to the source base station; the handover request confirmation message carries the first mapping relationship between the target base station using the quality of service flow and the wireless data bearer. One indication information or second indication information carrying the second mapping relationship between the quality of service flow of the target base station and the wireless data bearer; the handover rejection message is used to indicate that the target base station does not have a wireless data bearer that can meet the handover requirement. 28. The base station according to claim 27, wherein the handover request message further comprises at least one of the following information: Identification information of the quality of service flow; Reflect the configuration information of the quality of service flow and the wireless data bearer mapping; And, the configuration information of the mapping of the uplink quality of service flow and the wireless data bearer. 29. The base station according to claim 27, wherein the handover request message further comprises: PDU session-based data forwarding proposal; or, Data fronthaul proposal based on wireless data bearer; or, Data forwarding proposal based on quality of service flow. 30. The base station according to claim 29, wherein, in the case that the handover request message includes a data forwarding proposal based on a PDU session, the handover request confirmation message further comprises: the first number allocated by the target base station for the PDU session. 1. address information of the data forwarding tunnel; The processor is also used to: Receive a data packet forwarded by the source base station on the first data forwarding tunnel, wherein each data packet forwarded on the first data forwarding tunnel carries identification information of a quality of service flow. 31. The base station of claim 29, wherein, When the handover request message includes a data forwarding proposal based on the wireless data bearer, the handover request confirmation message further includes: address information of the second data forwarding tunnel allocated by the target base station for the wireless data bearer; When the handover request message includes a data forwarding proposal based on the quality of service flow, the handover request confirmation message further includes: address information of a third data forwarding tunnel allocated by the target base station for the quality of service flow. 32. The base station of claim 27, wherein the transceiver is further configured to: After sending the handover request confirmation message to the source base station, receive the sequence number SN status report sent by the source base station. 33. A computer-readable storage medium on which a computer program is stored, characterized in that, when the program is executed by a processor, the steps in the switching control method according to any one of claims 1-9 are implemented; Or, when the program is executed by the processor, the steps in the handover control method according to any one of claims 10-15 are implemented.

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