CN108605258B

CN108605258B - Mobility management method, base station and wearable device

Info

Publication number: CN108605258B
Application number: CN201680080724.9A
Authority: CN
Inventors: 杨皓睿; 何岳; 金辉
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2016-11-30
Filing date: 2016-11-30
Publication date: 2021-02-12
Anticipated expiration: 2036-11-30
Also published as: WO2018098708A1; CN108605258A

Abstract

The embodiment of the invention discloses a mobility management method, a base station and wearable equipment, relates to the field of communication, and solves the problems that WD (wireless data device) consumes serious electric quantity and processing burden on a network side is increased. The specific scheme is as follows: the method comprises the steps that a source base station receives a measurement report sent by WD, determines that the WD needs to be switched when the signal quality of a current resident cell obtained by WD measurement is lower than a first measurement threshold and the signal quality of each adjacent cell is higher than a third measurement threshold, determines that the WD and UE need to be switched together according to the received signal quality indication obtained by the WD, determines a first target cell according to the identification of the adjacent cell, and sends a first switching request comprising a first relay indication to a first target base station corresponding to the first target cell. The embodiment of the invention is used in the process of mobility management.

Description

Mobility management method, base station and wearable device

Technical Field

The present invention relates to the field of communications, and in particular, to a mobility management method, a base station, and a wearable device.

Background

Wearable Devices (WD) refer to smart devices that are worn by the human body using an independent operating system and enable continuous interaction. And as the market of the smart phone industry is saturated, the trend of the future development of the WD directly connecting to the network to communicate with the network becomes. However, the WD has a small size, so that its battery is small and only a single antenna technology can be used, which results in a short standby time of the WD and a low transmission efficiency when communicating with the network.

In the prior art, in order to solve the above problems, and considering that a technology of a User Equipment (UE) connecting to a network has matured, a User plane of a WD may be indirectly connected to the network through the UE so as to interact with the network for uplink and downlink User plane data. However, in order to maximize the reuse of the existing control flow, WD may continue to use a direct connection with the network for the interaction of uplink and downlink signaling, and thus, WD remains directly connected to the network while it is indirectly connected to the network via UE. In such a scenario, since the WD performs uplink and downlink signaling transmission through direct connection with the network, the WD may autonomously measure the signal quality of the cell in which the current base station is located, and report a measurement report to the current base station when it is determined that the signal quality of the cell in which the current base station is located cannot meet the service requirement, so as to switch to another cell that can meet the service requirement.

The prior art has at least the following problems: in a scenario where the WD is indirectly connected to the network through the UE and is directly connected to the network at the same time, both the WD and the UE may autonomously measure the signal quality of the cell in which the current base station is located and report the measurement report to the current base station, so that the WD and the UE may be respectively handed over by the current base station during the movement of the WD and the UE. In this case, in order to keep the existing handover procedure as much as possible for WD and to ensure the continuity of WD service, before WD performs handover operation, it is necessary to first switch the indirect connection with the current base station through UE to the direct connection with the current base station, and this switching procedure is complicated, which results in heavy power consumption of WD and increases the processing burden on the network side.

Disclosure of Invention

Embodiments of the present invention provide a mobility management method, a base station, and a wearable device, which solve the problems of severe power consumption of a WD and heavy processing load on a network side caused by respective handover operations performed by a current base station during a process of moving the WD and the UE together.

In order to achieve the purpose, the embodiment of the invention adopts the following technical scheme:

in a first aspect of the embodiments of the present invention, a mobility management method is provided, including:

the source base station receives a measurement report transmitted by the WD, wherein the measurement report transmitted by the WD comprises: the method comprises the steps of obtaining a signal quality indication obtained by WD, obtaining the signal quality of a current resident cell obtained by WD measurement, and determining that the WD needs to be switched when the received signal quality of the current resident cell obtained by WD measurement is lower than a first measurement threshold and the received signal quality of each adjacent cell is higher than a third measurement threshold. And the source base station determines that WD and UE need to be switched together according to the received signal quality indication obtained by WD, and determines the cell to which WD and UE need to be switched together, namely the first target cell, according to the identification of the adjacent cell included in the measurement report sent by WD. At this time, the source base station transmits a first handover request including a first relay instruction to a first target base station corresponding to the first target cell. Wherein the first relay indication is used to instruct the first target base station to perform a common handover for the WD and the UE.

Wherein the signal quality indication is used to indicate a signal quality of a side link between the WD and the UE, and a trend of degradation of the signal quality; WD is directly connected to the source base station for signaling transmission, and indirectly connected to the source base station through UE for user plane data transmission, and the current camping cell refers to a cell where WD served by the source base station is located.

In the mobility management method provided by the embodiment of the invention, the source base station determines that WD needs to be switched, and determines that WD and UE need to be switched together according to the signal quality indication obtained by WD. After determining a cell to which WD and UE need to be jointly handed over, that is, a first target cell, the first target base station may perform a joint handover operation on WD and UE according to a first relay instruction by sending a first handover request including a first relay instruction to a first target base station corresponding to the first target cell. Because WD and UE can be switched together, the side link between WD and UE does not need to be disconnected, so that when WD is switched, the operation of converting the indirect connection with the source base station into the direct connection with the source base station does not need to be executed, and the problems that the WD is seriously consumed by the electric quantity of the WD and the processing load of the network side is increased due to the fact that the WD and the UE respectively execute the switching operation in the process of moving together are solved.

With reference to the first aspect, in a possible implementation manner, to ensure accuracy of co-handover between WD and UE, before the source base station determines the first target cell according to an identifier of a neighboring cell included in a measurement report sent by WD, the mobility management method provided in the embodiment of the present invention may further include: the source base station receives a measurement report sent by UE, and the measurement report sent by the UE comprises: the method comprises the steps that signal quality indication obtained by UE, the signal quality of a current resident cell measured by the UE and the signal quality of at least one adjacent cell are obtained, and when the signal quality of the current resident cell measured by the UE is lower than a first measurement threshold and the signal quality of each adjacent cell is higher than a second measurement threshold, the UE is determined to need to carry out switching operation. At this time, the source base station determines that WD and UE need to perform common handover according to the signal quality indication obtained by WD, which may specifically include: and the source base station determines that the WD and the UE need to be jointly switched according to the signal quality indication obtained by the WD and the signal quality indication obtained by the UE.

With reference to the first aspect and the foregoing possible implementation manners, in another possible implementation manner, when there are at least two WD that are indirectly connected to the source base station through the UE, the measurement report sent by the UE and received by the source base station further includes: side Link identification (Side Link ID, SLI). At this time, before determining that the WD and the UE need to perform a common handover, the mobility management method provided in the embodiment of the present invention may further include: and the source base station determines the WD corresponding to the SLI from the at least two WDs as the WD which needs to be jointly switched with the UE.

With reference to the first aspect and the foregoing possible implementation manners, in another possible implementation manner, the measurement report received by the source base station and sent by the UE further includes: an identity of at least one neighboring cell. At this time, the determining, by the source base station, the first target cell according to the identifier of the neighboring cell included in the measurement report sent by the WD may specifically include: the source base station selects an alternative cell group from at least one adjacent cell included in the measurement report sent by WD and at least one adjacent cell included in the measurement report sent by UE, wherein the alternative cell group comprises at least one alternative cell, and each alternative cell simultaneously belongs to at least one adjacent cell included in the measurement report sent by WD and at least one adjacent cell included in the measurement report sent by UE. When the candidate cell group comprises one candidate cell, the source base station determines the candidate cell as a first target cell, and when the candidate cell group comprises at least two candidate cells, the source base station determines a cell with the best signal quality measured by the UE in the at least two candidate cells as the first target cell.

With reference to the first aspect and the foregoing possible implementation manners, in another possible implementation manner, the sending, by the source base station, the first handover request to the first target base station may further include: the context of the UE and the context of the WD, where the context of the UE and the context of the WD are used for the first target base station to allocate resources required for accessing the first target base station and PC5 radio resources for the UE and the WD, so that the first target base station can multiplex the received context of the UE and the context of the WD, and allocate resources required for accessing the first target base station and PC5 radio resources for the UE and the WD, thereby further reducing the processing load of the first target base station. Wherein the PC5 radio resource is used for WD and UE to update the side link resource between WD and UE.

With reference to the first aspect and the foregoing possible implementation manners, in another possible implementation manner, after the source base station sends the first handover request to the first target base station corresponding to the first target cell, the mobility management method provided in the embodiment of the present invention may further include: the source base station receives a first switching request acknowledgement which is sent by the first target base station and comprises a second relay instruction, a first switching command and a second switching command, sends the first switching command to the UE, and sends the second switching command to the WD.

Wherein the second relay indication is for informing the source base station that the first handover request acknowledgement is an acknowledgement for a common handover of the UE and the WD, the first handover command includes resources required for the UE to access the first target base station and PC5 radio resources, and the second handover command includes resources required for the WD to access the first target base station and PC5 radio resources.

With reference to the first aspect and the foregoing possible implementation manners, in another possible implementation manner, when the WD performs a single handover, the WD needs to first switch an indirect connection with the source base station to a direct connection with the source base station to perform the handover, so that power consumption of the WD is serious, and a processing load on a network side is increased. In order to save the electric quantity of the WD and reduce the processing load on the network side in the case of single WD handover, the mobility management method provided in the embodiment of the present invention may further include: and the source base station determines that WD needs to be switched independently according to the signal quality indication obtained by WD. And determining the cell with the best signal quality as the cell to which the WD needs to be independently switched, namely the second target cell according to the cell with the best signal quality in the adjacent cells included in the measurement report sent by the WD. And the source base station sends a second handover request including a context of the WD to a second target base station corresponding to the second target cell.

With reference to the first aspect and the foregoing possible implementation manners, in another possible implementation manner, after the source base station sends the second handover request to the second target base station corresponding to the second target cell, the mobility management method provided in the embodiment of the present invention may further include: the source base station receives a second handover request acknowledgement sent by the second target base station, including resources required by the WD to access the second target base station. And sends a third handover command and indication information to the WD. The third handover command includes resources required by the WD to access the second target base station, and the indication information is used for indicating the WD to disconnect the side link with the UE.

With reference to the first aspect and the foregoing possible implementation manners, in another possible implementation manner, the determining, by the source base station, that the WD and the UE need to be jointly switched according to the signal quality indication obtained by the WD and the signal quality indication obtained by the UE may specifically include: the source base station determines that WD and UE need to be jointly switched according to the side link signal strength and a first indication obtained by WD and the side link signal strength and the first indication obtained by UE, wherein the side link signal strength is used for indicating the signal quality of the side link between WD and UE, and the first indication is used for indicating the deterioration trend of the signal quality of the side link between WD and UE; or the source base station determines that WD and the UE need to be jointly switched according to a second indication obtained by WD and a second indication obtained by the UE, wherein the second indication is used for indicating the signal quality of the side link between WD and the UE and the degradation trend of the signal quality of the side link between WD and the UE.

In a second aspect of the embodiments of the present invention, a mobility management method is provided, including:

the target base station receives a first handover request which is sent by the source base station and comprises a first relay instruction, wherein the first relay instruction is used for instructing the target base station to carry out common handover on WD and UE. And performing a common handover for the WD and the UE according to the first handover request. WD is directly connected to the source base station for signaling transmission, and indirectly connected to the source base station through UE for user plane data transmission.

In the mobility management method provided in the embodiment of the present invention, the target base station may receive the first handover request including the first relay instruction sent by the source base station, and perform a common handover operation on the WD and the UE according to the first relay instruction. Because WD and UE can be switched together, the side link between WD and UE does not need to be disconnected, so that when WD is switched, the operation of converting the indirect connection with the source base station into the direct connection with the source base station does not need to be executed, and the problems that the WD is seriously consumed by the electric quantity of the WD and the processing load of the network side is increased due to the fact that the WD and the UE respectively execute the switching operation in the process of moving together are solved.

With reference to the second aspect, in a possible implementation manner, in order to further reduce the processing load of the target base station, the first handover request received by the target base station may further include: context of UE and context of WD. At this time, the target base station performs a common handover to the WD and the UE according to the first handover request, which may specifically include: the target base station multiplexes the context of the UE and the context of the WD, allocates resources required for accessing the target base station and the wireless resources of the PC5 to the UE and the WD according to the context of the UE and the context of the WD, and transmits a first handover request acknowledgement including a second relay indication, a first handover command and a second handover command to the source base station.

Wherein the second relay indication is for informing the source base station that the first handover request acknowledgement is an acknowledgement for a common handover of the UE and the WD, the first handover command includes resources required for the UE to access the target base station and PC5 radio resources, and the second handover command includes resources required for the WD to access the target base station and PC5 radio resources.

With reference to the second aspect and the foregoing possible implementation manners, in another possible implementation manner, when the WD performs a single handover, the WD needs to first switch an indirect connection with the source base station to a direct connection with the source base station to perform the handover, so that power consumption of the WD is serious, and a processing load on a network side is increased. In order to save the electric quantity of the WD and reduce the processing load on the network side in the case of single WD handover, the mobility management method provided in the embodiment of the present invention may further include: the target base station receives a second handover request including a context of the WD sent by the source base station.

With reference to the second aspect and the foregoing possible implementation manners, in another possible implementation manner, after the receiving, by the target base station, the second handover request sent by the source base station, the method may further include: the target base station allocates, according to the context of the WD, Data Radio Bearer (DRB) resources required for Data transmission with the target base station and resources required for accessing the target base station to the WD. And transmitting a second handover request acknowledgement including resources required for WD access to the target base station to the source base station.

With reference to the second aspect and the foregoing possible implementation manners, in another possible implementation manner, the mobility management method provided in the embodiment of the present invention may further include: the target base station sends a direct path switching indication to a Mobility Management Entity (MME), where the direct path switching indication is used to notify the MME that WD has disconnected a side link with the UE.

In a third aspect of the embodiments of the present invention, a mobility management method is provided, including:

WD measures the signal quality of the current resident cell and measures the signal quality of at least one neighboring cell, and when WD determines that the measured signal quality of the current resident cell is lower than a first measurement threshold and the signal quality of a cell existing in the neighboring cell of the current resident cell is higher than a third measurement threshold, WD sends a measurement report to the source base station, where the measurement report sent by WD includes: WD, and signal quality and identity of at least one neighbor cell having a signal quality above a third measurement threshold. And the WD receives a second switching command which is sent by the source base station and comprises resources required by the WD to access the target base station and the wireless resources of the PC5, accesses the target base station according to the received resources required by the access of the target base station, and updates the side link resources between the WD and the UE according to the received wireless resources of the PC 5.

The WD is directly connected with the source base station for signaling transmission and indirectly connected with the source base station through the UE for user plane data transmission, the current camping cell refers to a cell where the source base station is located, and the signal quality indicator indicates the signal quality of the side link between the WD and the UE and the degradation trend of the signal quality.

In the mobility management method provided in the embodiment of the present invention, after determining that handover is required, the WD sends, to the source base station, a measurement report including a signal quality indication that is obtained by the WD and used for indicating the signal quality of a side link between the WD and the UE and a degradation trend of the signal quality, so that the source base station determines that the WD and the UE need to perform handover together according to the received signal quality indication obtained by the WD. Because WD and UE can be switched together, the side link between WD and UE does not need to be disconnected, so that when WD is switched, the operation of converting the indirect connection with the source base station into the direct connection with the source base station does not need to be executed, and the problems that the WD is seriously consumed by the electric quantity of the WD and the processing load of the network side is increased due to the fact that the WD and the UE respectively execute the switching operation in the process of moving together are solved.

With reference to the third aspect, in a possible implementation manner, after the WD transmits the second measurement report to the source base station, the method may further include: and the WD receives a third switching command and indication information which are sent by the source base station and comprise resources required by the WD to access the target base station, accesses the target base station according to the resources required by the access of the target base station, and disconnects the side link with the UE according to the indication information.

With reference to the third aspect and the foregoing possible implementation manners, in another possible implementation manner, before sending the measurement report to the source base station, the method further includes: WD obtaining a side link signal strength and a first indication to obtain a signal quality indication, the side link signal strength being used for representing the signal quality of a side link between WD and UE, the first indication being used for indicating the deterioration trend of the signal quality of the side link between WD and UE; alternatively, WD obtains a second indication to obtain a signal quality indication, the second indication indicating a trend of deterioration of the signal quality of the side link between WD and UE and the signal quality of the side link between WD and UE.

A fourth aspect of the present invention provides a source base station, including:

a receiving unit, configured to receive a measurement report sent by the wearable device WD; WD is directly connected to the source base station for signaling transmission, and indirectly connected to the source base station through UE for user plane data transmission, and the measurement report sent by WD includes: a signal quality indicator obtained by WD, a signal quality of a current resident cell measured by WD, and a signal quality and an identification of at least one neighboring cell, wherein the signal quality indicator is used for indicating the signal quality of a side link between WD and UE and the degradation trend of the signal quality; a determining unit, configured to determine that WD needs to perform handover operation when it is determined that signal quality of a current camped cell obtained by WD measurement received by the receiving unit is lower than a first measurement threshold and signal quality of each neighboring cell received by the receiving unit is higher than a third measurement threshold, determine that WD and UE need to perform common handover according to a signal quality indication obtained by WD received by the receiving unit, and determine a first target cell according to an identifier of a neighboring cell included in a measurement report sent by WD received by the receiving unit; the first target cell is a cell to which WD and UE need to be jointly switched; a sending unit, configured to send a first handover request to a first target base station corresponding to the first target cell determined by the determining unit, where the first handover request includes a first relay instruction, and the first relay instruction is used to instruct the first target base station to perform common handover on the WD and the UE.

With reference to the fourth aspect, in a possible implementation manner, the receiving unit is further configured to receive a measurement report sent by the UE; the measurement report sent by the UE includes: the signal quality indication obtained by the UE, the signal quality of the current resident cell measured by the UE and the signal quality of at least one adjacent cell; the determining unit is further configured to determine that the UE needs to perform a handover operation when it is determined that the signal quality of the current camped cell measured by the UE received by the receiving unit is lower than a first measurement threshold and the signal quality of each neighboring cell received by the receiving unit is higher than a second measurement threshold; and a determining unit, configured to determine that the WD and the UE need to perform a common handover according to the signal quality indication obtained by the WD and the signal quality indication obtained by the UE received by the receiving unit.

With reference to the fourth aspect and the foregoing possible implementation manners, in another possible implementation manner, when there are at least two WD that are indirectly connected to the source base station through the UE, the measurement report sent by the UE and received by the receiving unit further includes: side link identification, SLI; the determining unit is further configured to determine, from the at least two WDs, that the WD corresponding to the SLI is a WD to be jointly switched with the UE.

With reference to the fourth aspect and the foregoing possible implementation manners, in another possible implementation manner, the measurement report sent by the UE and received by the receiving unit further includes: an identity of at least one neighboring cell; a determining unit, configured to select, from at least one neighboring cell included in the measurement report received by the receiving unit and the at least one neighboring cell included in the measurement report sent by the UE, a candidate cell group including at least one candidate cell; when the alternative cell group comprises one alternative cell, determining the alternative cell as a first target cell; when the candidate cell group comprises at least two candidate cells, determining the cell with the best signal quality measured by the UE in the at least two candidate cells as a first target cell.

With reference to the fourth aspect and the foregoing possible implementation manners, in another possible implementation manner, the first handover request sent by the sending unit further includes: context of UE and context of WD; the context of the UE and the context of the WD are used for the first target base station to allocate resources required for accessing the first target base station and PC5 radio resources for the UE and WD, and the PC5 radio resources are used for the WD and the UE to update side link resources between the WD and the UE.

With reference to the fourth aspect and the foregoing possible implementation manners, in another possible implementation manner, the receiving unit is further configured to receive a first handover request acknowledgement sent by the first target base station; wherein the first handover request acknowledgement includes the second relay indication, the first handover command, and the second handover command; the second relay indication is for informing the source base station that the first handover request acknowledgement is an acknowledgement for a common handover of the UE and the WD, the first handover command includes resources required for the UE to access the first target base station and PC5 radio resources, and the second handover command includes resources required for the WD to access the first target base station and PC5 radio resources; and the sending unit is further configured to send the first handover command received by the receiving unit to the UE, and send the second handover command received by the receiving unit to the WD.

With reference to the fourth aspect and the foregoing possible implementation manners, in another possible implementation manner, the determining unit is further configured to determine that the WD needs to be switched separately according to a signal quality indication obtained by the WD received by the receiving unit; a determining unit, configured to determine, as a second target cell, a cell with the best signal quality in neighboring cells included in the measurement report sent by the WD and received by the receiving unit; the second target cell is a cell to which WD needs to be independently switched; and a sending unit, configured to send a second handover request to a second target base station corresponding to the second target cell determined by the determining unit, where the second handover request includes a context of the WD.

With reference to the fourth aspect and the foregoing possible implementation manners, in another possible implementation manner, the receiving unit is further configured to receive a second handover request acknowledgement sent by the second target base station; wherein the second handover request acknowledgement includes resources required for the WD to access the second target base station; and the sending unit is further configured to send a third handover command and indication information to the WD, where the third handover command includes the resource required by the WD to access the second target base station and received by the receiving unit, and the indication information is used to indicate that the WD disconnects the side link with the UE.

With reference to the fourth aspect and the foregoing possible implementation manners, in another possible implementation manner, the determining unit is specifically configured to determine that WD and UE need to perform common handover according to a side link signal strength and a first indication obtained by WD, and the side link signal strength and the first indication obtained by the UE, where the side link signal strength is used to indicate a signal quality of a side link between WD and UE, and the first indication is used to indicate a trend of degradation of the signal quality of the side link between WD and UE; or, according to a second indication obtained by WD and a second indication obtained by UE, determining that WD and UE need to be switched together, wherein the second indication is used for indicating the signal quality of the side link between WD and UE and the deterioration trend of the signal quality of the side link between WD and UE.

For a specific implementation manner, reference may be made to the behavior function of the source base station in the mobility management method provided in the first aspect or the possible implementation manners of the first aspect.

In a fifth aspect of the embodiments of the present invention, a target base station is provided, including:

the receiving unit is used for receiving a first switching request sent by a source base station, wherein the first switching request comprises a first relay instruction, the first relay instruction is used for indicating a target base station to execute common switching on wearable equipment WD and user equipment UE, and the WD is directly connected with the source base station, is used for transmitting signaling, is indirectly connected with the source base station through the UE and is used for transmitting user plane data; a handover unit configured to perform a common handover for the WD and the UE according to the first handover request received by the reception unit.

With reference to the fifth aspect, in a possible implementation manner, the receiving unit further includes, in the first handover request received, that: context of UE and context of WD, and a handover unit, specifically configured to: multiplexing the context of the UE and the context of the WD received by the receiving unit, and allocating resources and PC5 wireless resources required by accessing the target base station to the UE and the WD according to the context of the UE and the context of the WD; sending a first handover request acknowledgement to the source base station; wherein the first handover request acknowledgement includes the second relay indication, the first handover command, and the second handover command; the second relay indicates an acknowledgement for informing the source base station that the first handover request acknowledgement is for a common handover of the UE and the WD, the first handover command includes resources required for the UE to access the target base station and PC5 radio resources, and the second handover command includes resources required for the WD to access the target base station and PC5 radio resources.

With reference to the fifth aspect and the foregoing possible implementation manners, in another possible implementation manner, the receiving unit is further configured to receive a second handover request sent by the source base station, where the second handover request includes a context of the WD.

With reference to the fifth aspect and the foregoing possible implementation manners, in another possible implementation manner, the method further includes: an allocating unit, configured to allocate, according to the context of the WD received by the receiving unit, a data radio bearer DRB resource required for data transmission with the target base station and a resource required for accessing the target base station for the WD; a sending unit, configured to send a second handover request acknowledgement to the source base station; wherein the second handover request acknowledgement includes the resources allocated by the allocation unit and required by the WD to access the target base station.

With reference to the fifth aspect and the foregoing possible implementation manners, in another possible implementation manner, the sending unit is further configured to send a direct path switching indication to the mobility management entity MME, where the direct path switching indication is used to notify the MME that WD has disconnected side link with the UE.

The second aspect may refer to the second aspect or a behavior function of the target base station in the mobility management method provided in a possible implementation manner of the second aspect.

In a sixth aspect of embodiments of the present invention, there is provided a WD, including:

a measuring unit, configured to measure the signal quality of a currently camped cell, and measure the signal quality of at least one neighboring cell; WD is directly connected with the source base station, is used for transmitting signaling, is indirectly connected with the source base station through user equipment UE, and is used for transmitting user plane data; a sending unit, configured to send a measurement report to the source base station when it is determined that the signal quality of the current camped cell measured by the measuring unit is lower than the first measurement threshold and the signal quality of a cell existing in an adjacent cell of the current camped cell is higher than a third measurement threshold; wherein, the measurement report sent by WD includes: a signal quality indicator obtained by WD, the signal quality of the current resident cell measured by the measuring unit, and the signal quality and identification of at least one adjacent cell with the signal quality higher than a third measurement threshold, wherein the signal quality indicator is used for indicating the signal quality of a side link between WD and UE and the deterioration trend of the signal quality; a receiving unit, configured to receive a second handover command sent by the source base station, where the second handover command includes resources required by the WD to access the target base station and PC5 wireless resources; the access unit is used for accessing the target base station according to the resource required by the target base station accessed by the receiving unit; and an updating unit for updating the side link resource between the WD and the UE according to the PC5 wireless resource received by the receiving unit.

With reference to the sixth aspect and the foregoing possible implementation manners, in another possible implementation manner, the method further includes: a disconnection unit; a receiving unit, further configured to receive a third handover command and indication information sent by the source base station, where the third handover command includes resources required by the WD to access the target base station; the access unit is also used for accessing the target base station according to the resources required by the target base station accessed by the receiving unit; and the disconnection unit is used for disconnecting the side link with the UE according to the indication information received by the receiving unit.

With reference to the sixth aspect and the foregoing possible implementation manners, in another possible implementation manner, the method further includes: an acquisition unit configured to: acquiring a side link signal strength and a first indication to obtain a signal quality indication, wherein the side link signal strength is used for representing the signal quality of a side link between WD and UE, and the first indication is used for indicating the deterioration trend of the signal quality of the side link between WD and UE; alternatively, a second indication is obtained to obtain a signal quality indication, the second indication indicating a trend of deterioration of the signal quality of the side link between WD and UE and the signal quality of the side link between WD and UE.

Specific implementation manners may refer to the third aspect or a behavior function of the WD in the mobility management method provided in a possible implementation manner of the third aspect.

A seventh aspect of the present invention provides a source base station, including: a processor, a memory, and a transceiver;

the memory is configured to store computer executable instructions, and the processor executes the computer executable instructions stored by the memory when the source base station is running, so as to cause the source base station to perform the mobility management method according to the first aspect or any one of the possible implementation manners of the first aspect.

In an eighth aspect of the embodiments of the present invention, a target base station is provided, including: a processor, a memory, and a transceiver;

the memory is configured to store computer-executable instructions, and the processor executes the computer-executable instructions stored by the memory when the target base station is running, so as to cause the target base station to perform the mobility management method according to the second aspect or any one of the possible implementation manners of the second aspect.

In a ninth aspect of embodiments of the present invention, there is provided a WD, including: a processor, a memory, and a transceiver;

the memory is configured to store computer executable instructions, which when run by the WD, the processor executes the computer executable instructions stored by the memory to cause the WD to perform the mobility management method as described in the third aspect or any one of the possible implementations of the third aspect.

In a tenth aspect of the embodiments of the present invention, a computer storage medium is provided, for storing computer software instructions for the source base station, where the computer software instructions include a program designed to execute the mobility management method.

In an eleventh aspect of the embodiments of the present invention, a computer storage medium is provided, which is used for storing computer software instructions for the target base station, where the computer software instructions include a program designed to execute the mobility management method.

A twelfth aspect of embodiments of the present invention provides a computer storage medium for storing computer software instructions for the WD, the computer software instructions comprising a program designed to perform the mobility management method.

Drawings

Fig. 1 is a simplified schematic diagram of a system architecture to which an embodiment of the present invention is applied;

fig. 2 is a schematic diagram illustrating a base station according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a WD according to an embodiment of the present invention;

fig. 4 is a flowchart of a mobility management method according to an embodiment of the present invention;

fig. 5 is a flowchart of another mobility management method according to an embodiment of the present invention;

fig. 6 is a flowchart of another mobility management method according to an embodiment of the present invention;

fig. 7 is a flowchart of another mobility management method according to an embodiment of the present invention;

fig. 8 is a flowchart of another mobility management method according to an embodiment of the present invention;

fig. 9 is a schematic diagram illustrating a source base station according to another embodiment of the present invention;

fig. 10 is a schematic diagram illustrating a source base station according to another embodiment of the present invention;

fig. 11 is a schematic diagram illustrating another target base station according to an embodiment of the present invention;

fig. 12 is a schematic diagram illustrating another target base station according to an embodiment of the present invention;

fig. 13 is a schematic diagram illustrating another target base station according to an embodiment of the present invention;

FIG. 14 is a schematic illustration of the composition of another WD according to an embodiment of the present invention;

FIG. 15 is a schematic illustration of the composition of another WD according to an embodiment of the present invention;

fig. 16 is a schematic diagram of another WD composition provided by an embodiment of the present invention.

Detailed Description

The terms "system" and "network" are often used interchangeably herein. The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

In order to solve the problems of severe power consumption of WD and heavy processing load on a network side caused by the fact that handover operations are respectively executed by a current base station in the process of moving WD and UE together, an embodiment of the present invention provides a mobility management method, which has the following basic principle: the method comprises the steps that a source base station receives a measurement report sent by WD, determines that the WD needs to be switched when the signal quality of a current resident cell obtained by WD measurement is lower than a first measurement threshold and the signal quality of each adjacent cell in the measurement report is higher than a third measurement threshold, determines that the WD and UE need to be switched together according to a signal quality indication obtained by the WD, determines a first target cell according to an identifier of the adjacent cell in the measurement report sent by the WD, and sends a first switching request comprising a first relay indication to a first target base station corresponding to the first target cell.

In this way, the source base station transmits a first handover request including the first relay indication to the first target base station, so that the first target base station can perform a common handover operation for WD and UE according to the first relay indication. Because WD and UE can be switched together, the side link between WD and UE does not need to be disconnected, so that when WD is switched, the operation of converting the indirect connection with the source base station into the direct connection with the source base station does not need to be executed, and the problems that the WD is seriously consumed by the electric quantity of the WD and the processing load of the network side is increased due to the fact that the WD and the UE respectively execute the switching operation in the process of moving together are solved.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a simplified schematic diagram of a system architecture to which embodiments of the present invention may be applied. As shown in fig. 1, the system architecture may include: a source base station 11, a WD12, a UE13, an MME14, a Serving GateWay (S-GW) 15, and a target base station 16.

WD12 establishes a direct connection with source base station 11 and performs uplink and downlink signaling interaction through the direct connection, and WD12 establishes an indirect connection with source base station 11 through UE13 and performs user plane data interaction through the indirect connection. After the WD12 and the UE13 are jointly handed over to the target base station 16, the WD12 establishes a direct connection with the target base station 16 and performs interaction of uplink and downlink signaling through the direct connection, and the WD12 establishes an indirect connection with the target base station 16 through the UE13 and performs interaction of user plane data through the indirect connection.

The Base Station (the Base Station may be the source Base Station 11 in the embodiment of the present invention, or may be the target Base Station 16 in the embodiment of the present invention) may be a Base Station (BS) or a Base Station controller (bsc) in wireless communication.

A base station is a device deployed in a radio access network to provide wireless communication functions for WD12 or UE13, and its main functions are: management of radio resources, compression of Internet Protocol (IP) headers and encryption of user data streams, selection of MME14 when a user equipment is attached, routing of user plane data to S-GW15, organization and transmission of paging messages, organization and transmission of broadcast messages, configuration of measurement and measurement reports for mobility or scheduling, and the like.

The base stations may include various forms of macro base stations, micro base stations, relay stations, access points, and the like. In systems using different radio access technologies, names of devices having a base station function may be different, for example, in an LTE system, The device is called an evolved NodeB (eNB or eNodeB), and in a 3rd Generation Telecommunication (3G) system, The device is called a base station (Node B), and so on. The name "base station" may change as communication technology evolves. Further, the base station may be other apparatus providing wireless communication functionality for the WD12 or the UE13, among other possible scenarios. For convenience of description, in the embodiment of the present invention, a device providing a wireless communication function for the WD12 or the UE13 is referred to as a base station.

WD12, including but not limited to smart watches, smart hands, smart wristbands, smart glasses, smart necklaces, smart rings, smart earrings, smart phones, and other types of smart wearable devices. In practical applications, the WD12 may provide various available network connection capabilities such as Bluetooth (BT), Wireless-Fidelity (Wi-Fi), Near Field Communication (NFC), Infrared (Infrared), and the like.

The WD12 may include various sensors such as an accelerometer, a gyroscope, a magnetometer, a light sensor, and a Global Positioning System (GPS), and Input/Output (I/O) components such as a microphone and a speaker. WD12 may effectively detect user actions (e.g., running, walking, etc.), user vital sign data (e.g., heart rate, blood pressure, etc.), and the current location of the user (i.e., the current location of the user), etc. using the various sensors described above.

The UE13 is a wireless terminal that itself may provide various available network connection capabilities such as BT, Wi-Fi, NFC, infrared, and the like. A wireless terminal may refer to a device that provides voice and/or data connectivity to a user, a handheld device having wireless connection capability, or other processing device connected to a wireless modem.

A wireless terminal may communicate with one or more core networks via a Radio Access Network (RAN). The Wireless terminals may be mobile terminals such as mobile phones (or "cellular" phones) and computers with mobile terminals, as well as portable, pocket, hand-held, computer-included, or vehicle-mounted mobile devices that exchange language and/or data with the RAN, such as Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs), and the like. Wireless terminals may also be referred to as User agents (User agents), User devices (User devices).

The MME14 is mainly responsible for functions of Non-Access-Stratum (NAS) signaling transmission, NAS signaling encryption, roaming, tracking, user temporary identity assignment, and the like.

The S-GW15 is responsible for providing capabilities such as service gateway functions, mobility anchor functions, policy enforcement functions, etc. for the WD12 and the UE 13.

Fig. 2 is a schematic composition diagram of a base station according to an embodiment of the present invention, where the base station may be a source base station in the embodiment of the present invention or a target base station in the embodiment of the present invention, and as shown in fig. 2, the base station may include at least one processor 21, a memory 22, and a transceiver 23.

The following describes each component of the base station in detail with reference to fig. 2:

the processor 21 may be a single processor or may be a collective term for a plurality of processing elements. For example, the processor 21 may be a general processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the program according to the present invention, such as: one or more microprocessors (digital signal processors, DSPs), or one or more Field Programmable Gate Arrays (FPGAs). The processor 21 may perform various functions of the base station by running or executing software programs stored in the memory 22, and calling data stored in the memory 22, among other things.

In particular implementations, processor 21 may include one or more CPUs such as CPU0 and CPU1 shown in fig. 2, for example, as an example.

In particular implementations, the base station may include multiple processors, such as processor 21 and processor 24 shown in fig. 2, for one embodiment. Each of these processors may be a single-Core Processor (CPU) or a multi-Core Processor (CPU). A processor herein may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).

The memory 22 may be, but is not limited to, a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a Random Access Memory (RAM) or other type of dynamic storage device that can store information and instructions, an electrically erasable programmable read-only memory (EEPROM), a compact disk read-only memory (CD-ROM) or other optical disk storage, optical disk storage (including compact disk, laser disk, optical disk, digital versatile disk, blu-ray disk, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.

The memory may be self-contained and coupled to the processor via a bus. The memory may also be integral to the processor.

The memory 22 is used for storing application program codes for executing the scheme of the invention, and the processor 21 controls the execution. The processor 21 is operative to execute application program code stored in the memory 22.

A transceiver 23 for communicating with other devices or communication networks, such as ethernet, RAN, Wireless Local Area Networks (WLAN), etc. In embodiments of the present invention, the transceiver 23 may include all or part of a baseband processor, and may also optionally include a Radio Frequency (RF) processor. The RF processor is used for transceiving RF signals, and the baseband processor is used for processing baseband signals converted from RF signals or baseband signals to be converted into RF signals.

Fig. 3 is a schematic diagram illustrating the composition of a WD according to an embodiment of the present invention, and as shown in fig. 3, the WD may include at least one processor 31, a memory 32 and a transceiver 33.

The processor 31 may be a single processor or may be a collective term for a plurality of processing elements. For example, the processor 31 may be a CPU, an ASIC, or one or more integrated circuits for controlling the execution of the programs according to the present invention, such as: one or more DSPs, or one or more FPGAs.

The processor 31 may perform various functions of the WD by, among other things, running or executing software programs stored in the memory 32, and invoking data stored in the memory 32.

In particular implementations, processor 31 may include one or more CPUs such as CPU0 and CPU1 in fig. 3, for example, as one embodiment.

In a particular implementation, WD may include multiple processors, such as processor 31 and processor 34 in fig. 3, as an example. Each of these processors may be a single core processor or a multi-core processor. A processor herein may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).

Memory 32 may be, but is not limited to, ROM or other type of static storage device that can store static information and instructions, RAM or other type of dynamic storage device that can store information and instructions, EEPROM, CD-ROM or other optical disk storage, optical disk storage (including compact disk, laser disk, optical disk, digital versatile disk, blu-ray disk, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.

A transceiver 33 for communicating with other devices or a communication network, such as ethernet, RAN, WLAN, etc. The transceiver 33 may include a receiving unit implementing a receiving function and a transmitting unit implementing a transmitting function.

Fig. 4 is a flowchart of a mobility management method according to an embodiment of the present invention, and as shown in fig. 4, the method may include:

401. WD measures the signal quality of the currently camped cell and measures the signal quality of at least one neighboring cell.

The current resident cell refers to a cell where a WD served by the source base station is located, and at least one adjacent cell is a cell which is obtained by the WD and is adjacent to the current resident cell. In a scenario that WD is directly connected to a source base station and indirectly connected to the source base station through UE and there is traffic currently being transmitted by WD, if WD moves, signal quality of a currently camped cell may be measured and signal quality of at least one neighboring cell may be measured.

402. And the WD sends a measurement report to the source base station when the signal quality of the current resident cell obtained by measurement is lower than the first measurement threshold and the signal quality of the cell existing in the adjacent cell of the current resident cell is higher than the third measurement threshold.

After WD measures the signal quality of the current camped cell and measures the signal quality of the neighboring cell of the current camped cell, WD may send a measurement report to the source base station when determining that the measured signal quality of the current camped cell is lower than a first measurement threshold, which indicates that the signal quality of the current camped cell cannot meet the service requirement of WD, and that a cell with a signal quality higher than a third measurement threshold exists in the neighboring cell of the current camped cell, which indicates that the signal quality of the neighboring cell can meet the service requirement of WD, where the measurement report sent by WD includes: the signal quality indication obtained by WD, the signal quality of the current resident cell measured by WD, and the signal quality and identification of at least one neighboring cell (the at least one neighboring cell refers to a cell with the signal quality higher than the third measurement threshold in the neighboring cells of the current resident cell).

Wherein the signal quality indication obtained by WD is used to indicate the signal quality of the side link between WD and UE, and the tendency of deterioration of the signal quality.

For example, WD may periodically measure the signal quality of the side link between WD and UE, and a degradation trend of the signal quality may be determined according to the measured change of the signal quality within a preset time period. For example, WD may determine that the signal quality is deteriorating as being lower when measured a second time than the first time and a third time than the second time.

403. The source base station receives the measurement report sent by WD.

404. And the source base station determines that WD needs to be switched according to the measurement report sent by WD, determines that WD and UE need to be switched together, and determines a first target cell.

The first target cell is a cell to which WD and UE need to be jointly handed over.

After the source base station receives the measurement report sent by the WD, the source base station may determine that the WD needs to perform a handover operation when determining that the signal quality of the current camped cell measured by the WD is lower than a first measurement threshold and determining that the signal quality of each neighboring cell is higher than a third measurement threshold, according to the signal quality of the current camped cell and the signal quality of at least one neighboring cell measured by the WD, which are included in the measurement report sent by the WD.

And can determine that WD and UE need to be switched together according to the signal quality indication obtained by WD.

And the source base station may determine the first target cell according to an identifier of at least one neighboring cell included in a measurement report sent by the WD.

For example, when the signal quality of the side link between WD and UE is above a threshold and there is no tendency for the signal quality to deteriorate, it is determined that WD and UE need to be co-handed over. WD and UE do not need to perform a common handover when the signal quality of the side link between WD and UE is below a threshold and/or the signal quality tends to deteriorate.

405. The source base station sends a first handover request to a first target base station corresponding to a first target cell.

The first handover request includes a first relay indication, where the first relay indication is used to indicate the first target base station to perform common handover on the WD and the UE. After the source base station determines that WD needs to be handed over, determines that WD and UE need to be handed over together, and determines a first target cell, the source base station may send a first handover request including a first relay indication to a first target base station corresponding to the first target cell through an X2 interface.

406. The target base station receives a first handover request sent by the source base station.

407. The target base station performs a common handover to the WD and the UE according to the first handover request.

It should be noted that, in order to facilitate understanding of those skilled in the art, in the following, the mobility management method provided in the embodiment of the present invention is specifically described by taking the measurement report sent by the UE as the first measurement report and the measurement report sent by the WD as the second measurement report.

Fig. 5 is a flowchart of a mobility management method according to an embodiment of the present invention, in a scenario where a WD is indirectly connected to a network through a UE (where the UE and the WD currently reside in the same cell), and is directly connected to the network, and there is a service being transmitted by the WD currently, if the UE and the WD move together, a situation that the currently-residing cell cannot meet a service requirement of the WD may occur, and at this time, in order to ensure service continuity of the WD, and in order to reduce power consumption of the WD as much as possible, the UE and the WD may be jointly switched to another cell that can meet the service requirement of the WD, so as to continue to provide a service for the WD through the cell. As shown in fig. 5, the method may include:

501. the source base station sends a first measurement control signaling to the UE.

The first Measurement Control (Measurement Control) signaling may include: the method comprises a first measurement threshold and a second measurement threshold, wherein the first measurement threshold is used for judging whether the Signal quality (Signal Strength) of the current resident cell meets the service requirement of the UE.

The second measurement threshold is used for judging whether the signal quality of a first adjacent cell included in the first adjacent cell group meets the service requirement of the UE, the first adjacent cell group may include at least one first adjacent cell, and the first adjacent cell is a cell adjacent to a currently camped cell of the UE.

In order that when the UE moves and a current resident cell cannot meet a service requirement of the UE due to the movement, the UE may switch to another cell capable of meeting the service requirement in time, the source base station may send, to the UE, a first measurement control signaling for determining whether the current resident cell and a cell adjacent to the current resident cell meet the service requirement of the UE in advance.

It should be noted that, the source base station may configure different measurement thresholds for each first neighboring cell included in the first neighboring cell group, may also configure the same measurement threshold for all first neighboring cells included in the first neighboring cell group, and may also configure the same measurement threshold for some first neighboring cells included in the first neighboring cell group.

502. The UE receives a first measurement control signaling sent by a source base station.

503. The UE sends a first measurement report to the source base station.

After the UE receives a first measurement control signaling sent by a source base station, if the UE moves, the UE can measure the signal quality of the current resident cell and the signal quality of each first adjacent cell in a first adjacent cell group, judge whether the signal quality of the current resident cell meets the current service requirement according to a first measurement threshold included in the received first measurement control signaling, judge whether the signal quality of each first adjacent cell meets the current service requirement according to a second measurement threshold included in the first measurement control signaling, and when the UE determines that the signal quality of the current resident cell is lower than the first measurement threshold, the signal quality of the current resident cell cannot meet the current service requirement, and determine that the signal quality of the first adjacent cell existing in the first adjacent cell group is higher than the second measurement threshold, that is, when it is indicated that the signal quality of the first neighboring cell can meet the current service requirement, the UE may send a first Measurement Report (Measurement Report) to the source base station. Wherein the first neighbor cell in the first neighbor cell group having a signal quality above the second measurement threshold is included in a third neighbor cell group.

In a first possible implementation manner, the first measurement report may include: SLI, Signal quality of a currently camped cell measured by the UE, Signal quality and identification of each first neighboring cell in the third neighboring cell group, Side Link Signal Strength (Side Link Signal Strength), and a first indication (the first indication may be a Side Link Signal Strength Deterioration indication, that is, a Side Link Signal Strength determination Indicator); in a second possible implementation manner, the first measurement report may include: SLI, signal quality of the currently camped cell measured by the UE, signal quality and identity of each first neighboring cell in the third set of neighboring cells, and a second indication.

Where SLI refers to the identity of a Side Link (Side Link) bearer between the WD and the UE. The SLI is used for determining WDs which need to be switched together in WDs connected with the UE.

When the first measurement report comprises the side link signal strength and a first indication, the side link signal strength is used for indicating the signal quality of the side link between WD and the UE, and the first indication is used for indicating the deterioration trend of the signal quality of the side link between WD and the UE, so that whether the UE and WD need to be jointly switched or not is determined according to the signal quality of the side link between the UE and WD and the deterioration trend of the signal quality. The value of the first indication may be: 0 or 1, in one possible implementation, 0 may represent that the signal quality of the side link is not deteriorating, and 1 may represent that the signal quality of the side link is deteriorating, in another possible implementation, 1 may represent that the signal quality of the side link is not deteriorating, and 0 may represent that the signal quality of the side link is deteriorating, or other values may be used to represent the deterioration trend of the signal quality of the side link.

It should be noted that the specific value of the first indication may be set according to the requirement of the actual application scenario, and the embodiment of the present invention is not limited specifically here.

In the embodiment of the present invention, the value of the first indication is 0 or 1, where 0 represents that the signal quality of the side link is not deteriorating, and 1 represents that the signal quality of the side link is deteriorating.

There may be four cases where the sidelink signal strength and the first indication included in the first measurement report sent by the UE to the source base station:

the side link signal strength is above the threshold and the first indication is 0, where the side link signal strength and the first indication indicate that the signal quality condition of the side link between WD and UE satisfies the condition for common handover.

The side link signal strength is above the threshold and the first indication is 1, where the side link signal strength and the first indication indicate that the signal quality condition of the side link between the UE and the WD does not satisfy the condition for the common handover.

The side link signal strength is below the threshold and the first indication is 0, where the side link signal strength and the first indication indicate that the signal quality condition of the side link between the UE and the WD does not satisfy the condition for the common handover.

The side link signal strength is below the threshold and the first indication is 1, where the side link signal strength and the first indication indicate that the signal quality condition of the side link between the UE and the WD does not satisfy the condition for the common handover.

Illustratively, it is assumed that the side link signal strength included in the first measurement report sent by the UE to the source base station is higher than the threshold, and the first indication is 0, and both are used to indicate that the signal quality condition of the side link between the UE and the WD meets the condition of common handover.

When the first measurement report comprises a second indication, the second indication is used for indicating the signal quality of the side link between WD and UE and the degradation trend of the signal quality, so that whether the UE and WD need to be jointly switched or not is determined according to the signal quality of the side link between the UE and WD and the degradation trend of the signal quality.

In a possible implementation manner, the value of the second indication may be: 00. 01, 10, 11.

00 represents that the signal quality of the side link is above the threshold and the signal quality of the side link is not deteriorating, when the second indication indicates that the signal quality condition of the side link between the UE and the WD satisfies the condition for the common handover.

01 represents that the signal quality of the side link is above the threshold and the signal quality of the side link is deteriorating, at which time the second indication indicates that the signal quality condition of the side link between the UE and WD does not satisfy the condition for common handover.

10 represents that the signal quality of the side link is below the threshold and the signal quality of the side link is not deteriorating, when the second indication indicates that the signal quality condition of the side link between the UE and the WD does not satisfy the condition for the common handover.

11 represents that the signal quality of the side link is below the threshold and the signal quality of the side link is deteriorating, when the second indication indicates that the signal quality condition of the side link between the UE and the WD does not satisfy the condition for common handover.

Illustratively, it is assumed that the second indication included in the first measurement report sent by the UE to the source base station is 00, that is, the signal strength quality of the side link is higher than the threshold, the signal quality of the side link is not deteriorating, and the second indication is used to indicate that the signal quality condition of the side link between the UE and the WD meets the condition of common handover.

It should be noted that, the side link signal strength and the first indication, or the second indication may be obtained by the UE detecting the signal quality of the side link between the UE and the WD. The UE may periodically measure the signal quality of the side link between the UE and the WD to obtain the side link signal strength and the first indication, or obtain the second indication. For example, the UE may measure the signal quality of the side link between the UE and WD once every 1s (second).

504. The source base station sends second measurement control signaling to the WD.

Wherein, the second measurement control signaling may include: the method comprises the steps of determining whether the signal quality of a currently camped cell meets the service requirement of WD, determining whether the signal quality of a second adjacent cell included in a second adjacent cell group meets the service requirement of WD, wherein the second adjacent cell group may include at least one second adjacent cell, and the second adjacent cell is a cell adjacent to the currently camped cell of WD.

Since WD performs transmission of uplink and downlink signaling through direct connection with the network, in order that WD may be timely switched to another cell that can meet the service requirement of WD when WD moves and the current camped cell cannot meet the service requirement of WD due to the movement, the source base station may send a second measurement control signaling for determining whether the current camped cell and a cell adjacent to the current camped cell meet the service requirement of WD to WD in advance through direct connection with WD.

It should be noted that the source base station may configure different measurement thresholds for each second neighboring cell included in the second neighboring cell group, may also configure the same measurement threshold for all second neighboring cells included in the second neighboring cell group, and may also configure the same measurement threshold for a part of second neighboring cells included in the second neighboring cell group.

505. The WD receives second measurement control signaling sent by the source base station.

506. WD sends a second measurement report to the source base station.

After receiving the second measurement control signaling sent by the source base station, if the WD moves, the WD may measure the signal quality of the current camped cell and the signal quality of each second neighbor cell in the second neighbor cell group.

And judging whether the signal quality of the current resident cell meets the current service requirement according to a first measurement threshold included in the received second measurement control signaling, and judging whether the signal quality of each second adjacent cell meets the current service requirement according to a third measurement threshold included in the second measurement control signaling.

When WD determines that the signal quality of the current resident cell is lower than the first measurement threshold, i.e. it indicates that the signal quality of the current resident cell cannot meet the current service requirement, and determines that the signal quality of the second neighboring cell in the second neighboring cell group is higher than the third measurement threshold, i.e. it indicates that the signal quality of the second neighboring cell can meet the current service requirement, WD may send a second measurement report to the source base station.

Wherein the second neighboring cell in the second neighboring cell group having a signal quality above the third measurement threshold is included in a fourth neighboring cell group.

In a first possible implementation manner, the second measurement report may include: the signal quality of the current resident cell, the signal quality and the identification of each second adjacent cell in the fourth adjacent cell group, the side link signal strength and the first indication which are obtained by WD measurement; in a second possible implementation manner, the second measurement report may include: WD, the signal quality of the currently camped cell, the signal quality and identity of each second neighbor cell in the fourth set of neighbor cells, and a second indication.

It should be noted that, the specific description of the parameter included in the second measurement report is similar to the specific description of the parameter included in the first measurement report, and for the specific description of the parameter included in the second measurement report, reference may be made to the specific description of the corresponding parameter included in the first measurement report in step 503, which is not repeated herein.

When the side link signal strength and the first indication are included in the second measurement report, for example, the first indication is 0, assuming that the side link signal strength included in the second measurement report sent by the WD to the source base station is higher than the threshold, and both are used to indicate that the signal quality condition of the side link between the UE and the WD meets the condition of common handover.

When the second indication is included in the second measurement report, it is assumed that the second indication included in the second measurement report sent by the WD to the source base station is 00, that is, the signal quality of the side link is higher than the threshold, and the signal quality of the side link is not deteriorating, which indicates that the signal quality condition of the side link between the UE and the WD meets the condition of the common handover.

It should be noted that, the side link signal strength and the first indication, or the second indication may be obtained by detecting, by the WD, the signal quality of the side link between the UE and the WD. WD may periodically measure the signal quality of the side link between UE and WD to obtain a side link signal strength and a first indication, or obtain a second indication. For example, WD may measure the signal quality of the side link between UE and WD once every 2s (seconds).

It should be noted that, in the embodiment of the present invention, the steps 501 to 503 have no precedence relationship with the execution of the steps 504 to 506, that is, the steps 501 to 503 may be executed first, and then the steps 504 to 506 are executed, or the steps 504 to 506 may be executed first, and then the steps 501 to 503 are executed, where the execution sequence of the steps 501 to 503 and the steps 504 to 506 is not specifically limited in the embodiment of the present invention.

507. The source base station receives a first measurement report sent by the UE and receives a second measurement report sent by the WD.

508. And the source base station determines that the UE and the WD need to be jointly switched according to the first measurement report and the second measurement report, and determines a target cell.

Wherein, the target cell refers to a neighboring cell of a current resident cell to which the UE and WD need to be jointly handed over.

Corresponding to the first possible implementation manner of the first measurement report in step 503, after the source base station receives the first measurement report sent by the UE, the source base station may determine whether the signal quality of the current camped cell measured by the UE included in the first measurement report is lower than a first measurement threshold, and determine whether the signal quality of each first neighboring cell in the third neighboring cell group included in the first measurement report is higher than a second measurement threshold.

And then determining that the UE needs to be switched according to the fact that the signal quality of the current resident cell is lower than a first measurement threshold and the signal quality of each first adjacent cell in the third adjacent cell group is higher than a second measurement threshold.

And the source base station may determine whether the signal quality condition of the side link between the UE and the WD meets the condition of the common handover according to the side link signal strength and the first indication included in the first measurement report, so that it may be determined whether the UE and the WD need to perform the common handover according to whether the signal quality condition of the side link between the UE and the WD meets the condition of the common handover.

Illustratively, according to the example in step 503, the source base station may determine that the signal quality condition of the side link between the UE and the WD satisfies the condition of the common handover according to that the side link signal strength included in the first measurement report is higher than the threshold and the first indication is 0, and then the source base station may determine that the UE and WD need to be jointly handed over according to that the obtained signal quality condition of the side link between the UE and WD satisfies the condition of the common handover.

Corresponding to the second possible implementation manner of the first measurement report in step 503, after the source base station receives the first measurement report sent by the UE, the source base station may determine whether the signal quality of the current camped cell measured by the UE included in the first measurement report is lower than a first measurement threshold.

And determining whether the signal quality of each first neighbor cell in the third set of neighbor cells included in the first measurement report is above a second measurement threshold.

And the source base station may determine whether the signal quality condition of the side link between the UE and the WD meets the condition of the common handover according to the second indication included in the first measurement report, so that it may be determined whether the UE and the WD need to perform the common handover according to whether the signal quality condition of the side link between the UE and the WD meets the condition of the common handover.

Illustratively, according to the example in step 503, the source base station may determine that the signal quality condition of the side link between the UE and the WD satisfies the common handover condition according to the second indication 00 included in the first measurement report, that is, the signal quality of the side link is higher than the threshold, and the signal quality of the side link is not deteriorating. At this time, the source base station may determine that the UE and WD need to be jointly switched according to the condition that the obtained signal quality of the side link between the UE and WD meets the joint switching condition.

Corresponding to the first possible implementation manner of the second measurement report in step 506, after the source base station receives the second measurement report sent by the WD, the source base station may determine whether the signal quality of the currently camped cell measured by the WD, which is included in the second measurement report, is lower than the first measurement threshold.

And determining whether the signal quality of each second neighboring cell in the fourth set of neighboring cells included in the second measurement report is above a third measurement threshold.

And then determining that the WD needs to be switched according to the fact that the signal quality of the current resident cell is lower than the first measurement threshold and the signal quality of each second adjacent cell in the fourth adjacent cell group is higher than the third measurement threshold.

And the source base station may determine whether the signal quality condition of the side link between the UE and the WD meets the condition of the common handover according to the side link signal strength and the first indication included in the second measurement report, so that it may be determined whether the UE and the WD need to perform the common handover according to whether the signal quality condition of the side link between the UE and the WD meets the condition of the common handover.

Illustratively, according to the example in step 506, the source base station may determine that the signal quality condition of the side link between the UE and the WD satisfies the condition of the common handover according to that the side link signal strength included in the second measurement report is higher than the threshold, and the first indication is 0, and at this time, the source base station may determine that the UE and the WD need to be jointly handed over according to that the obtained signal quality condition of the side link between the UE and the WD satisfies the condition of the common handover.

Corresponding to the second possible implementation manner of the second measurement report in step 506, after the source base station receives the second measurement report sent by the WD, the source base station may determine whether the signal quality of the currently camped cell measured by the WD, which is included in the second measurement report, is lower than the first measurement threshold.

And the source base station may determine whether the signal quality condition of the side link between the UE and the WD meets the condition of the common handover according to the second indication included in the second measurement report, so that it may be determined whether the UE and the WD need to perform the common handover according to whether the signal quality condition of the side link between the UE and the WD meets the condition of the common handover.

Illustratively, according to the example in step 506, the source base station may determine that the signal quality condition of the side link between the UE and the WD satisfies the condition for common handover according to the second indication 00 included in the second measurement report, that is, the signal quality of the side link is higher than the threshold and the signal quality of the side link is not deteriorating, and then the source base station may determine that the UE and WD need to be commonly handed over according to the obtained signal quality condition of the side link between the UE and WD satisfying the condition for common handover.

After the source base station determines that the UE and the WD need to be jointly switched according to the first measurement report and the second measurement report, because the UE may be simultaneously connected with a plurality of WDs, the source base station may also determine, according to the SLI included in the first measurement report, the WD that needs to be jointly switched in the WD connected with the UE.

Specifically, the source base station may allocate a Layer 2ID (L2 ID) of a packet for distinguishing the WD from the UE to the WD, according to the context of the WD. And the L2 IDs allocated by the source base station for different WDs are different, and are allocated with SLI for identifying the side link bearer between the UE and the WD, and the L2 ID, the SLI, and the corresponding relationship between the SLI and the L2 ID are also stored. Therefore, after the source base station receives the first measurement report sent by the UE, the source base station may determine the L2 ID corresponding to the SLI included in the first measurement report by searching the stored correspondence between the SLI and the L2 ID according to the SLI included in the first measurement report, so as to determine which WD of the plurality of WDs connected to the UE needs to be jointly switched with the UE.

After the source base station determines the WD to be co-handed over with the UE, the source base station may determine the target cell according to the identifier of each first neighboring cell in the third neighboring cell group included in the first measurement report and the identifier of each second neighboring cell in the fourth neighboring cell group included in the second measurement report.

The specific determination method may be: the source base station may select, according to the identifier of each first neighboring cell in the third neighboring cell group and the identifier of each second neighboring cell in the fourth neighboring cell group, a neighboring cell with the same identifier from the third neighboring cell group and the fourth neighboring cell group as a candidate cell group, where the candidate cell group may include at least one candidate cell, and if only one candidate cell is included in the candidate cell group, the source base station determines that the candidate cell is a target cell, and if the candidate cell group includes a plurality of candidate cells, the source base station may select, according to the signal quality of each first neighboring cell in the third neighboring cell group included in the first measurement report, a neighboring cell with the best signal quality measured by the UE from the candidate cell group as the target cell.

Of course, when there is only one WD connected to the UE, the first measurement report does not need to include the SLI, and the source base station does not need to perform the operation of determining which WD is co-handed over to the UE according to the SLI, but directly performs the operation of determining the target cell after determining that the UE and WD need to be co-handed over.

It should be noted that, if the source base station does not receive the first measurement report and the second measurement report at the same time, the source base station may determine whether the UE and the WD need to perform a common handover according to the measurement report received first. If it is determined that the UE and the WD need to be jointly switched, the source base station may determine whether another measurement report is received within a preset time period after it is determined that the UE and the WD need to be jointly switched. If another measurement report is received within the preset time period, after determining that the UE and the WD need to perform the common handover according to the another measurement report, performing step 509; and if another measurement report is not received in the preset time period or another measurement report is received in the preset time period, but the UE and the WD do not need to be switched together according to the another measurement report, determining that the UE and the WD do not need to be switched together.

509. And the source base station sends a switching request to a target base station corresponding to the target cell.

After the source base station determines that the UE and the WD need to be jointly switched according to the first measurement report and the second measurement report, and determines the target cell, the source base station may send a Handover Request (Handover Request) to the target base station corresponding to the target cell through an X2 interface. The handover request may include: a Relay Indicator (Relay Indicator), a Context of the UE (UE Context Information), and a Context of WD (WD Context Information).

Wherein the relay indication is used for indicating the target base station to perform common handover on the UE and the WD. The context of the UE may include: a first Radio Resource Control (RRC) context (the first RRC context may include a Radio Bearer ID (RB ID)), a corresponding relationship between L2 ID, SLI, and L2 ID, and a corresponding relationship between SLI and RB ID, where RB ID is an identifier of a DRB between the UE and the source base station, L2 ID is an identifier allocated by the source base station for WD, and SLI is an identifier of a side link between WD and the UE. The WD may include a second RRC context that may include an EBI that is an identification of an Evolved Packet System (EPS) bearer between the WD and the core network.

510. And the target base station receives the switching request sent by the source base station.

Wherein, the target base station can receive the handover request sent by the source base station through the X2 interface.

511. And the target base station multiplexes the context of the UE and the context of the WD according to the switching request, and allocates resources for transmitting the service data, the wireless resources of the PC5 and the access resources.

After the target base station receives the handover request sent by the source base station, the target base station may determine that the WD and the UE need to be jointly handed over to the coverage area of the target base station, that is, the target cell, according to the relay indication included in the handover request. And the source base station may determine that the side link between the UE and the WD still exists according to the SLI included in the context of the UE, so that the PC5 radio resources required for the WD and the UE to update the side link between the WD and the UE may be allocated, where the PC5 refers to an interface between the UE and the WD. The target base station may also directly multiplex the L2 ID, SLI, correspondence of SLI and L2 ID, and correspondence of SLI and RB ID included in the context of the UE without regeneration.

The target base station may further allocate and reserve resources for transmitting service data for the common handover between the UE and the WD according to the context of the UE and the context of the WD included in the handover request, and the target base station may allocate access resources, where the access resources may include: the first identifier, the second identifier, the first preamble and the second preamble. The first identity may be a first C-RNTI, and the second identity may be a second C-RNTI.

The first identifier is used for identifying the UE, the first preamble is used for accessing the UE to the target base station, the second identifier is used for identifying the WD, and the second preamble is used for accessing the WD to the target base station.

512. And the target base station sends a switching request confirmation to the source base station.

After the target base station multiplexes the context of the UE and the context of the WD and allocates resources for transmitting traffic data, PC5 radio resources, and access resources according to the Handover Request, the target base station may transmit a Handover Request acknowledgement (Handover Request Ack) to the source base station. The handover request acknowledgement may include: a relay indication, a first Handover Command (Handover Command), and a second Handover Command, wherein the relay indication is used to inform the source base station that the Handover request is confirmed to be confirmation of a common Handover between the UE and the WD, the first Handover Command is included in first information, the first information may specifically be a first Target to source transparent container (Target to source transparent container), the second Handover Command is included in second information, the second information may specifically be a second Target to source transparent container, the first Handover Command may include a first identifier, a first Preamble (Preamble), and a PC5 radio resource, and the second Handover Command may include a second identifier, a second Preamble, and a PC5 radio resource.

513. And the source base station receives the switching request confirmation sent by the target base station.

514. The source base station sends the first handover command included in the handover request acknowledgement to the UE.

After the source base station receives the handover request acknowledgement sent by the target base station, the source base station may send the first handover command included in the handover request acknowledgement to the UE. For example, the source base station may send the first handover command to the UE in RRC Connection Reconfiguration (RRC Connection Reconfiguration).

515. The UE receives a first handover command sent by a source base station.

516. And the UE disconnects with the source base station according to the first switching command and accesses the target base station.

After the UE receives the first handover command sent by the source base station, the UE may disconnect the connection with the source base station according to the first handover command, synchronize with the target base station, access the target base station according to the first preamble included in the first handover command, and carry the first identifier when accessing the target base station, so that the target base station determines, according to the first identifier, that the UE is accessing the target base station, determines, according to the first identifier, a context of the UE, and then establishes, according to the context of the UE in step 511, a DRB that satisfies QoS with the UE.

517. The source base station sends a second handover command included in the handover request acknowledgement to the WD.

Wherein, after the source base station receives the handover request acknowledgement sent by the target base station, the source base station may send a second handover command included in the handover request acknowledgement to the WD. For example, the source base station may send the WD with the second handover command in an RRC link reconfiguration.

518. The WD receives the second handover command sent by the source base station.

It should be noted that, in the embodiment of the present invention, the steps 514 to 515 have no precedence in the execution of the steps 517 to 518, that is, after the step 513 is executed, the steps 514 to 515 may be executed first, and then the steps 517 to 518 are executed, or the steps 517 to 518 may be executed first, and then the steps 514 to 515 may be executed, where the execution sequence of the steps 514 to 515 and the steps 517 to 518 is not specifically limited in the embodiment of the present invention.

519. WD disconnects from the source base station according to the second handover command and accesses the target base station.

After receiving the second handover command sent by the source base station, the WD may disconnect the connection with the source base station according to the second handover command, synchronize with the target base station, access the target base station according to the second preamble included in the second handover command, and carry the second identifier when accessing the target base station, so that the target base station determines that the WD is accessing the target base station according to the second identifier, finds out the context of the WD according to the second identifier, and then establishes a direct connection with the WD according to the context of the WD in step 511.

520. The UE updates the side link resources according to the PC5 radio resources included in the first handover command.

After the UE disconnects from the source base station according to the first handover command and accesses the target base station, the UE may update the side link resource according to the PC5 wireless resource included in the first handover command so as to successfully switch to the target cell, and at this time, if the UE has uplink data to send, the UE may directly send the uplink data to the target base station, so that the target base station forwards the received uplink data to the S-GW, thereby completing transmission of the uplink data.

521. WD updates the side link resource according to the PC5 radio resource included in the second handover command.

After the WD disconnects from the source base station according to the second handover command and accesses the target base station, the WD may update the side link resource according to the PC5 wireless resource included in the second handover command so as to successfully handover to the target cell, and at this time, if there is uplink data to be sent by the WD, the uplink data may be forwarded to the target base station by the UE, so that the target base station forwards the received uplink data to the S-GW, thereby completing transmission of the uplink data.

It should be noted that, in order to implement common handover between WD and UE and ensure service continuity of WD, in the embodiment of the present invention, preferably, step 516 and step 519 may be executed simultaneously, and step 520 and step 521 may also be executed simultaneously.

522. The UE sends a first handover acknowledgement to the target base station.

In order to enable the target base station to know that the UE has successfully handed over to the target cell, after the sidelink resource update of the UE is completed, the UE may send a first Handover confirmation (Handover Confirm) for notifying that the UE has successfully handed over to the target cell to the target base station.

523. The target base station receives a first handover confirmation sent by the UE.

After receiving the first handover confirmation sent by the UE, the target base station may determine that the UE has been successfully handed over to the target cell according to the received first handover confirmation.

524. WD sends a second handover acknowledgement to the target base station.

Wherein, in order to enable the target base station to know that the WD has been successfully handed over to the target cell, after the update of the side link resources of the WD is completed, the WD may send a second handover confirmation to the target base station to notify that the WD has been successfully handed over to the target cell.

525. The target base station receives the second handover acknowledgement sent by WD.

Wherein, after receiving the second handover confirmation sent by the WD, the target base station may determine that the WD has been successfully handed over to the target cell according to the received second handover confirmation.

It should be noted that, in the embodiment of the present invention, step 522 to step 523 have no precedence relationship with the execution of step 524 to step 525, that is, step 522 to step 523 may be executed first, and then step 524 to step 525 may be executed, or step 524 to step 525 may be executed first, and then step 522 to step 523 may be executed, where the execution sequence of step 522 to step 523 and step 524 to step 525 is not specifically limited in the embodiment of the present invention.

After steps 501 to 525 are completed, the uplink data channel between the UE and the target base station and the uplink data channel between the WD and the target base station are successfully established, but the downlink data channel is not established yet, and the S-GW can only transmit the downlink data to the target base station through the source base station, so that the target base station transmits the downlink data to the UE and the WD, and at this time, in order to enable the downlink data to be directly transmitted to the target base station by the SGW, the following steps 526 to 537 may be performed:

526. and the target base station sends a first path switching request to the MME.

After the target base station determines, according to the received first handover confirmation, that the UE has been successfully handed over to the target cell, the target base station may send a Path Switch Request (Path Switch Request) of the UE to the MME, that is, a first Path Switch Request, where the first Path Switch Request may include: identification of the target base station, EBI of S1-U needing to be modified and UE ID, wherein the target base station identification can be TEID, and S1-U refers to connection between the target base station and S-GW.

527. And the MME receives a first path switching request sent by the target base station.

528. And the target base station sends a second path switching request to the MME.

After the target base station determines that the WD has been successfully switched to the target cell according to the received second handover confirmation, the target base station may send a path switching request of the WD, that is, a second path switching request, to the MME, where the second path switching request may include: TEID, EBI and WD ID of S1-U that needs modification.

529. And the MME receives a second path switching request sent by the target base station.

It should be noted that, in the embodiment of the present invention, step 526 to step 527 have no precedence in the execution of step 528 to step 529, that is, step 526 to step 527 may be executed first, and then step 528 to step 529 are executed, or step 528 to step 529 may be executed first, and then step 526 to step 527 are executed, where the execution sequence of step 526 to step 527 and step 528 to step 529 is not specifically limited in the embodiment of the present invention.

530. And the MME sends a bearer modification request to the S-GW according to the first path switching request and the second path switching request.

The Modify Bearer Request (Modify Bearer Request) may include: TEID and EBI of S1-U that needs modification. After the MME receives the first path switching request and the second path switching request sent by the target base station, the MME may carry the TEID included in the first path switching request and the second path switching request and the EBI of the S1-U to be modified in the modify bearer request and send the modified bearer request to the S-GW.

531. And the S-GW receives the bearer modification request sent by the MME and modifies the bearer according to the bearer modification request.

After receiving the bearer modification request sent by the MME, the S-GW may determine, according to the TEID included in the bearer modification request, downlink data to be sent to the UE or WD to be forwarded by the target base station, instead of the source base station, that is, when the SGW has downlink data to send to the UE or WD, the S-GW sends the downlink data to the target base station. And the S-GW performs bearer modification according to the EBI of the S1-U to be modified included in the bearer modification request, and specifically may modify the physical channel for sending the downlink data, that is, the S-GW may modify a first physical channel (the first physical channel is a channel through which the S-GW sends the downlink data to the source base station) into a second physical channel (the second physical channel is a channel through which the S-GW sends the downlink data to the target base station).

532. The S-GW sends a modify bearer reply to the MME.

After the S-GW receives the Bearer modification request sent by the MME and modifies the Bearer according to the Bearer modification request, the S-GW may send a Bearer modification reply (Modify Bearer Response) to the MME.

533. And the MME receives the modified bearer reply sent by the S-GW.

534. The MME sends a path switch acknowledgement to the target base station.

After the MME receives the modify bearer reply sent by the S-GW, the MME may send a Path Switch Ack (Path Switch Ack) to the target base station.

535. And the target base station receives the path switching confirmation sent by the MME.

536. The target base station sends Iu release command to the source base station.

537. And the source base station receives the Iu release command sent by the target base station.

Wherein, the source base station may Release the related resources of the UE and the WD after receiving an Iu Release Command (Iu Release Command) sent by the target base station.

And the source base station determines that WD and UE need to be switched together according to the signal quality indication obtained by the UE and the signal quality indication obtained by the WD in the measurement report of the UE, and determines that WD and UE need to be switched together, so that the accuracy of the common switching of WD and UE is ensured, and the source base station further reduces the processing burden of the first target base station by sending a first switching request which also comprises the context of the UE and the context of WD to the first target base station.

Fig. 6 is a flowchart of another mobility management method according to an embodiment of the present invention, in a scenario where a WD is indirectly connected to a network through a UE (where the UE and the WD currently reside in the same cell), and the WD is directly connected to the network, and there is a service currently being transmitted by the WD, if the UE and the WD move together, a situation that the currently residing cell cannot meet a service requirement of the WD may occur, and at this time, in order to ensure service continuity of the WD, and in order to reduce power consumption of the WD as much as possible, the UE and the WD may be jointly switched to another cell that can meet the service requirement of the WD, so as to continue to provide a service for the WD through the cell. As shown in fig. 6, the method may include:

601. the source base station sends a first measurement control signaling to the UE.

The first measurement control signaling may include: a first measurement threshold and a second measurement threshold.

602. The UE receives a first measurement control signaling sent by a source base station.

603. The UE sends a first measurement report to the source base station.

In a first possible implementation manner, the first measurement report may include: SLI, the signal quality of the current resident cell measured by the UE, the signal quality and identification of each first adjacent cell in the third adjacent cell group, the side link signal strength and a first indication; in a second possible implementation manner, the first measurement report may include: SLI, signal quality of the currently camped cell measured by the UE, signal quality and identity of each first neighboring cell in the third set of neighboring cells, and a second indication.

604. The source base station sends second measurement control signaling to the WD.

Wherein, the second measurement control signaling may include: a first measurement threshold and a third measurement threshold.

605. The WD receives second measurement control signaling sent by the source base station.

606. WD sends a second measurement report to the source base station.

It should be noted that, in the embodiment of the present invention, the steps 601 to 603 have no precedence in the execution of the steps 604 to 606, that is, the steps 601 to 603 may be executed first, and then the steps 604 to 606 are executed, or the steps 604 to 606 may be executed first, and then the steps 601 to 603 are executed, where the execution sequence of the steps 601 to 603 and the steps 604 to 606 is not specifically limited in the embodiment of the present invention.

607. The source base station receives a first measurement report sent by the UE and receives a second measurement report sent by the WD.

608. And the source base station determines that the UE and the WD need to be jointly switched according to the first measurement report and the second measurement report, and determines a target cell.

609. The source base station sends a first handover request to a target base station corresponding to the target cell.

After the source base station determines that the UE and the WD need to perform a common handover according to the first measurement report and the second measurement report, and determines the target cell, the source base station may send a handover request of the UE, that is, a first handover request, to the target base station corresponding to the target cell through an X2 interface, where the first handover request may include: the relay indication and the context of the UE may include a first RRC context (the first RRC context may include an RB ID), a L2 ID, a SLI, a correspondence between the SLI and the L2 ID, and a correspondence between the SLI and the RB ID, where the RB ID is an identifier of a data radio bearer between the UE and the source base station, the L2 ID is an identifier allocated by the source base station for WD, and the SLI is an identifier of a side link between WD and the UE.

610. The target base station receives a first handover request sent by the source base station.

Wherein, the target base station can receive the first switching request sent by the source base station through an X2 interface.

611. And the source base station sends a second switching request to the target base station corresponding to the target cell.

After the source base station determines that the UE and the WD need to perform a common handover according to the first measurement report and the second measurement report, and determines the target cell, the source base station may send a handover request of the WD, that is, a second handover request, to the target base station corresponding to the target cell, where the second handover request may include: the relay indication and the context of the WD, the context of the WD may include a second RRC context, and the second RRC context may include an EBI, which is an identification of the EPS bearer between the WD and the core network.

612. And the target base station receives a second switching request sent by the source base station.

Wherein, the target base station can receive the second handover request sent by the source base station through the X2 interface.

It should be noted that, in the embodiment of the present invention, the steps 609 to 610 have no precedence in the execution of the steps 611 to 612, that is, after the step 608 is executed, the steps 609 to 610 may be executed first, and then the steps 611 to 612 may be executed, or the steps 611 to 612 may be executed first, and then the steps 609 to 610 may be executed, where the execution sequence of the steps 609 to 610, and the steps 611 to 612 is not specifically limited in the embodiment of the present invention.

613. The target base station multiplexes the context of the UE and the context of the WD, and allocates resources for transmitting traffic data, PC5 radio resources, and access resources according to the first handover request and the second handover request.

Wherein, the access resource may include: the first identifier, the second identifier, the first preamble and the second preamble.

614. The target base station sends a first handover request acknowledgement to the source base station.

After the target base station multiplexes the context of the UE and the context of the WD and allocates resources for transmitting traffic data, PC5 radio resources, and access resources according to the handover request, the target base station may send a handover request acknowledgement of the UE, i.e., a first handover request acknowledgement, to the source base station. The first handover request acknowledgement may include: the relay device comprises a relay instruction and a first switching command, wherein the first switching command is included in first information, the first information may specifically be a first Target to source transmission provider, and the first switching command may include a first identifier, a first preamble and a PC5 wireless resource.

615. The source base station receives the first switching request confirmation sent by the target base station.

616. And the target base station sends a second switching request confirmation to the source base station.

After the target base station multiplexes the context of the UE and the context of the WD according to the handover request and allocates the resource for transmitting the traffic data, the PC5 radio resource, and the access resource, the target base station may transmit a handover request acknowledgement of the WD, that is, a second handover request acknowledgement, to the source base station. The second handover request acknowledgement may include: the relay instruction and the second handover command, where the second handover command is included in the second information, and the second information may specifically be a second Target to source transit provider, and the second handover command may include a second identifier, a second preamble, and a PC5 radio resource.

617. And the source base station receives the second switching request confirmation sent by the target base station.

It should be noted that, in the embodiment of the present invention, step 614 to step 615 have no precedence in execution of step 616 to step 617, that is, after step 613 is executed, step 614 to step 615 may be executed first, and then step 616 to step 617 are executed, or step 616 to step 617 may be executed first, and then step 614 to step 615 are executed, where the execution sequence of step 614 to step 615, and step 616 to step 617 is not specifically limited in this embodiment of the present invention.

618. The source base station transmits a first handover command included in the first handover request acknowledgement to the UE.

619. The UE receives a first handover command sent by a source base station.

620. And the UE disconnects with the source base station according to the first switching command and accesses the target base station.

621. The source base station sends a second handover command included in the second handover request acknowledgement to the WD.

622. The WD receives the second handover command sent by the source base station.

It should be noted that, in the embodiment of the present invention, the execution sequence of steps 618 to 619 and steps 621 to 622 is not specifically limited, that is, step 618 to step 619 may be executed first, and then step 621 to step 622 is executed, or step 621 to step 622 may be executed first, and then step 618 to step 619 is executed.

623. WD disconnects from the source base station according to the second handover command and accesses the target base station.

624. The UE updates the side link resources according to the PC5 radio resources included in the first handover command.

625. WD updates the side link resource according to the PC5 radio resource included in the second handover command.

It should be noted that, in order to implement common handover between WD and UE and ensure service continuity of WD, in the embodiment of the present invention, preferably, step 620 and step 623 may be performed simultaneously, and step 624 and step 625 may also be performed simultaneously.

626. The UE sends a first handover acknowledgement to the target base station.

627. The target base station receives a first handover confirmation sent by the UE.

628. WD sends a second handover acknowledgement to the target base station.

629. The target base station receives the second handover acknowledgement sent by WD.

After steps 601-629 are performed, the uplink data channel between the UE and the target base station and the uplink data channel between the WD and the target base station are successfully established, but the downlink data channel is not established, and the S-GW can only transmit downlink data to the target base station through the source base station, so that the target base station transmits downlink data to the UE and WD, at this time, in order to enable the downlink data to be directly transmitted to the target base station by the SGW, the following steps 630-641 may be performed:

it should be noted that, in the embodiment of the present invention, steps 626 to 627 have no precedence in execution of steps 628 to 629, that is, step 626 to 627 may be executed first, and then step 628 to 629 may be executed, or step 628 to 629 may be executed first, and then step 626 to 627 may be executed, where the execution sequence of step 626 to 627 and step 628 to 629 is not specifically limited in the embodiment of the present invention.

630. And the target base station sends a first path switching request to the MME.

Wherein, the first path conversion request may include: identification of the target base station, EBI of S1-U needing to be modified and UE ID, the target base station identification can be TEID, S1-U refers to the connection between the target base station and S-GW.

631. And the MME receives a first path switching request sent by the target base station.

632. And the target base station sends a second path switching request to the MME.

Wherein, the second path conversion request may include: TEID, EBI and WD ID of S1-U that needs modification.

633. And the MME receives a second path switching request sent by the target base station.

It should be noted that, in the embodiment of the present invention, the steps 630 to 631 have no precedence relationship with the execution of the steps 632 to 633, that is, the steps 630 to 631 are executed first, and then the steps 632 to 633 are executed, or the steps 632 to 633 are executed first, and then the steps 630 to 631 are executed, where the execution sequence of the steps 630 to 631 and the steps 632 to 633 is not specifically limited in the embodiment of the present invention.

634. And the MME sends a bearer modification request to the S-GW according to the first path switching request and the second path switching request.

Wherein, modifying the bearer request may include: TEID and EBI of S1-U that needs modification. After the MME receives the first path switching request and the second path switching request sent by the target base station, the MME may carry the TEID included in the first path switching request and the second path switching request and the EBI of the S1-U to be modified in the modify bearer request and send the modified bearer request to the S-GW.

635. And the S-GW receives the bearer modification request sent by the MME and modifies the bearer according to the bearer modification request.

636. The S-GW sends a modify bearer reply to the MME.

637. And the MME receives the modified bearer reply sent by the S-GW.

638. The MME sends a path switch acknowledgement to the target base station.

639. And the target base station receives the path switching confirmation sent by the MME.

640. The target base station sends Iu release command to the source base station.

641. And the source base station receives the Iu release command sent by the target base station.

It should be noted that, the detailed descriptions of steps 601 to 641 in the embodiment of the present invention are similar to the detailed descriptions of corresponding steps in steps 501 to 537 in another embodiment of the present invention, and for the detailed descriptions of steps 601 to 641 in the embodiment of the present invention, the detailed descriptions of corresponding steps in steps 501 to 537 in another embodiment may be referred to, and the embodiments of the present invention are not repeated herein.

Fig. 7 is a flowchart of another mobility management method according to an embodiment of the present invention, in a scenario where a WD is indirectly connected to a network through a UE (where the UE and the WD currently reside in the same cell), and is directly connected to the network, and there is a service being transmitted by the WD currently, if the UE and the WD move together, a situation that the currently-residing cell cannot meet a service requirement of the WD may occur, and at this time, in order to ensure service continuity of the WD, and in order to reduce power consumption of the WD as much as possible, the WD may be switched to another cell that can meet the service requirement of the WD, so as to continue to provide the service for the WD through the cell. As shown in fig. 7, the method may include:

701. the source base station sends second measurement control signaling to the WD.

702. The WD receives second measurement control signaling sent by the source base station.

703. WD sends a second measurement report to the source base station.

After WD receives a second measurement control signaling sent by the source base station, if WD moves, the WD can measure the signal quality of the current resident cell and the signal quality of each second adjacent cell in the second adjacent cell group, and judge whether the signal quality of the current resident cell meets the current service requirement according to a first measurement threshold included in the received second measurement control signaling, judge whether the signal quality of each second adjacent cell meets the current service requirement according to a third measurement threshold included in the second measurement control signaling, when WD determines that the signal quality of the current resident cell is lower than the first measurement threshold, namely, the signal quality of the current resident cell cannot meet the current service requirement, and determine that the signal quality of the second adjacent cell in the second adjacent cell group is higher than the third measurement, i.e. it indicates that there is a second neighbouring cell whose signal quality can meet the current traffic demand, the WD may send a second measurement report to the source base station.

It should be noted that, the specific description of the parameter included in the second measurement report is similar to the specific description of the parameter included in the first measurement report in step 503 in another embodiment of the present invention, and for the specific description of the parameter included in the second measurement report, reference may be made to the specific description of the corresponding parameter included in the first measurement report in step 503 in another embodiment of the present invention, and the embodiments of the present invention are not described in detail here.

When the side link signal strength and the first indication are included in the second measurement report, for example, the first indication is 1, assuming that the side link signal strength included in the second measurement report sent by the WD to the source base station is lower than the threshold, and both are used to indicate that the signal quality condition of the side link between the UE and the WD does not satisfy the condition of common handover.

When the second indication is included in the second measurement report, it is assumed that the second indication included in the second measurement report sent by WD to the source base station is 11, that is, the signal quality of the side link is lower than the threshold, and the signal quality of the side link is deteriorating, which is used to indicate that the signal quality condition of the side link between the UE and WD does not satisfy the condition of common handover.

704. The source base station receives the second measurement report sent by WD.

705. And the source base station determines that WD needs to be switched independently according to the second measurement report, deletes the association relation between the UE and the WD and determines the target cell.

Wherein the target cell refers to a neighboring cell of the currently camped cell to which WD needs to be individually handed over. Corresponding to the first possible implementation manner of the second measurement report in step 703, after the source base station receives the second measurement report sent by the WD, the source base station may determine whether the signal quality of the current camped cell obtained by the WD measurement included in the second measurement report is lower than the first measurement threshold, determine whether the signal quality of each second neighboring cell in the fourth neighboring cell group included in the second measurement report is higher than the third measurement threshold, then determine that the WD needs to be handed over according to the determination that the signal quality of the current camped cell is lower than the first measurement threshold, and determine whether the signal quality of each second neighboring cell in the fourth neighboring cell group is higher than the third measurement threshold, and the source base station may determine whether the signal quality of the side link between the UE and the WD meets the condition of the common handover according to the side link signal strength and the first indication included in the second measurement report, therefore, whether the UE and the WD need to be jointly switched can be determined according to whether the signal quality condition of the side link between the UE and the WD meets the condition of joint switching. Illustratively, according to the example in step 703, the source base station may determine that the signal quality of the side link between the UE and the WD does not satisfy the condition for the common handover according to that the side link signal strength included in the second measurement report is lower than the threshold, and the first indication is 1, and at this time, the source base station may determine that the WD needs to be switched separately according to that the obtained signal quality of the side link between the UE and the WD does not satisfy the condition for the common handover.

Corresponding to the second possible implementation manner of the second measurement report in step 703, after the source base station receives the second measurement report sent by the WD, the source base station may determine whether the signal quality of the current camped cell obtained by the WD measurement included in the second measurement report is lower than the first measurement threshold, determine whether the signal quality of each second neighboring cell in the fourth neighboring cell group included in the second measurement report is higher than the third measurement threshold, then determine that the WD needs to be handed over according to the determination that the signal quality of the current camped cell is lower than the first measurement threshold, and determine whether the signal quality of each second neighboring cell in the fourth neighboring cell group is higher than the third measurement threshold, and according to the second indication included in the second measurement report, the source base station may determine whether the signal quality of the side link between the UE and the WD meets the condition of common handover, therefore, whether the UE and the WD need to be jointly switched can be determined according to whether the signal quality condition of the side link between the UE and the WD meets the condition of joint switching. Illustratively, according to the example in step 703, the source base station may determine that the signal quality condition of the side link between the UE and the WD does not satisfy the condition of the common handover according to the second indication 11 included in the second measurement report, that is, the signal quality of the side link is lower than the threshold and the signal quality of the side link is deteriorating. At this time, the source base station may determine that WD needs to be switched separately according to the fact that the obtained signal quality of the side link between UE and WD does not satisfy the common switching condition.

After the source base station determines that WD needs to be switched separately according to the second measurement report, the source base station may determine that the UE and WD need to be instructed to disconnect the side link therebetween, and further, the source base station determines that an instruction message for instructing to disconnect the side link between the UE and WD needs to be sent to the UE and WD, respectively. And the source base station may delete the association between the UE and the WD, specifically delete the correspondence between SLI, L2 ID, SLI, and L2 ID, and the correspondence between SLI and RB ID included in the context of the UE, the ID of the WD (the WD is a device that receives UE relay) in the context of the UE, and may also delete the ID of the UE (the UE is a device that provides relay service for the WD) in the context of the WD. The source base station may further select, as the target cell, the neighboring cell with the best signal quality measured by WD from the fourth neighboring cell group according to the signal quality and the identity of each second neighboring cell in the fourth neighboring cell group included in the second measurement report, so as to handover WD to the target cell individually.

706. And the source base station sends a second switching request to the target base station corresponding to the target cell.

After the source base station determines that WD needs to be switched separately according to the second measurement report, deletes the association relationship between UE and WD, and determines the target cell, the source base station may send a second switching request to the target base station corresponding to the target cell through an X2 interface, where the second switching request may include: context of WD, context of WD may include a second RRC context, which may include EBI, which is an identification of EPS bearers between WD and core network.

707. And the target base station receives a second switching request sent by the source base station.

708. And the target base station allocates new DRB related resources for WD according to the second switching request, and allocates access resources and resources for transmitting service data.

Since there is no DRB related resource in the second RRC context included in the second handover request, after the target base station receives the second handover request sent by the source base station, the target base station may allocate a new DRB related resource for WD, and may allocate an access resource, where the access resource may include: a second identity and a second preamble, and the target base station may allocate and reserve resources for transmitting traffic data for individual handover of the WD, according to a context of the WD included in the second handover request.

709. And the target base station sends a second switching request confirmation to the source base station.

The second handover request acknowledgement may include a second handover command, where the second handover command may include a second identifier and a second preamble.

710. And the source base station receives the second switching request confirmation sent by the target base station.

711. The source base station sends a second RRC link reconfiguration to the WD.

After the source base station receives the second handover request acknowledgement sent by the target base station, the source base station may carry the second handover command included in the second handover request acknowledgement and the indication information described in step 705 together in the second RRC link reconfiguration and send the second RRC link reconfiguration to the WD.

712. The WD receives a second RRC link reconfiguration transmitted by the source base station.

713. WD reconfigures to disconnect the connection with the UE according to the second RRC link, deletes the corresponding relation between the EBI and the SLI, disconnects the connection with the source base station, and accesses the target base station.

After receiving the second RRC link reconfiguration sent by the source base station, the WD may disconnect the connection with the UE according to the indication information included in the second RRC link reconfiguration, delete the correspondence between the EBI and the SLI, disconnect the connection with the source base station according to the second handover command, synchronize with the target base station, access the target base station according to the second preamble included in the second handover command, and carry the second identifier when accessing the target base station, so that the target base station determines that the access to the target base station is the WD according to the second identifier, and establish the DRB between the target base station and the WD according to the new DRB related resource allocated to the WD in step 708.

714. WD sends a second handover acknowledgement to the target base station.

715. The target base station receives the second handover acknowledgement sent by WD.

After steps 701 to 715, the WD and the target base station have successfully established the uplink data channel, but the downlink data channel has not been established, and the S-GW can only transmit downlink data to the target base station through the source base station, so that the target base station transmits the downlink data to the WD, and at this time, in order to enable the downlink data to be directly transmitted to the target base station from the SGW, the following steps 716 to 726 may be performed:

716. and the target base station sends a second path switching request to the MME.

After the target base station determines that the WD has been successfully switched to the target cell according to the received second handover confirmation, the target base station may send a path switching request of the WD, that is, a second path switching request, to the MME, where the second path switching request may include: TEID, EBI of S1-U requiring modification, WD ID, and Direct Path Switch Indicator (Direct Path Switch Indicator). The direct path switch indication is used to inform the MME that WD has disconnected from the UE.

717. And the MME receives a second path switching request sent by the target base station.

718. The MME deletes the WD ID in the context of the UE and the UE ID in the context of the WD according to the second path switch request.

After the MME receives the second path switch request sent by the target base station, the MME may delete the ID of the WD (the WD is a device that accepts UE relaying) in the context of the UE and may also delete the ID of the UE (the UE is a device that provides a relay service for the WD) in the context of the WD according to the direct path switch indication included in the second path switch request.

719. And the MME sends a bearer modification request to the S-GW according to the second path switching request.

Wherein, modifying the bearer request may include: TEID and EBI of S1-U that needs modification. After the MME deletes the WD ID in the context of the UE and the UE ID in the context of the WD according to the second path switch request, the MME may send the modified bearer request including the TEID included in the second path switch request and the EBI of S1-U that needs to be modified to the S-GW, with the TEID and the EBI.

720. And the S-GW receives the bearer modification request sent by the MME and modifies the bearer according to the bearer modification request.

After receiving the bearer modification request sent by the MME, the S-GW may determine, according to the TEID included in the bearer modification request, that the downlink data to be sent to the WD needs to be forwarded by the target base station, instead of being forwarded by the source base station, that is, when the SGW has downlink data to send to the WD, the S-GW sends the downlink data to the target base station. And the S-GW performs bearer modification according to the EBI of the S1-U to be modified included in the bearer modification request, and specifically may modify the physical channel for sending the downlink data, that is, the S-GW may modify a first physical channel (the first physical channel is a channel through which the S-GW sends the downlink data to the source base station) into a second physical channel (the second physical channel is a channel through which the S-GW sends the downlink data to the target base station).

721. The S-GW sends a modify bearer reply to the MME.

After the S-GW receives the bearer modification request sent by the MME and modifies the bearer according to the bearer modification request, the S-GW may send a bearer modification reply to the MME.

722. And the MME receives the modified bearer reply sent by the S-GW.

723. The MME sends a path switch acknowledgement to the target base station.

724. And the target base station receives the path switching confirmation sent by the MME.

725. The target base station sends Iu release command to the source base station.

726. And the source base station receives the Iu release command sent by the target base station.

After receiving the Iu release command sent by the target base station, the source base station may release the resources related to the WD according to the Iu release command.

727. The source base station sends a first RRC link reconfiguration to the UE.

After the source base station releases the resources related to WD, the source base station may send the indication information and the configuration parameter carried in the first RRC link reconfiguration to the UE, where the indication information and the configuration parameter are used for the UE to restore the connection configuration between the UE and the source base station to the connection configuration before the UE relays for WD.

728. The UE receives the first RRC link reconfiguration sent by the source base station.

729. And the UE disconnects the WD according to the first RRC link reconfiguration, and deletes the corresponding relation between the SLI and the L2 ID and the corresponding relation between the SLI and the RB ID.

After the UE receives the first RRC link reconfiguration sent by the source base station, the UE may disconnect the connection with the WD according to the indication information included in the first RRC link reconfiguration, and delete the corresponding relationship between the SLI and the L2 ID and the corresponding relationship between the SLI and the RB ID. In addition, the UE may also restore the connection configuration between itself and the source base station to the connection configuration before itself is the WD relay according to the configuration parameters included in the first RRC link reconfiguration.

730. The UE sends RRC link reconfiguration complete to the source base station.

After the UE disconnects the WD according to the first RRC link Reconfiguration, and deletes the correspondence between the SLI and the L2 ID and the correspondence between the SLI and the RB ID, the UE may send an RRC link Reconfiguration Complete (RRC Connection Reconfiguration Complete) to the source base station.

731. And the source base station receives the RRC link reconfiguration completion sent by the UE.

After receiving the RRC link reconfiguration complete sent by the UE, the source base station may release the sidelink resource.

It should be noted that, the detailed descriptions of steps 701 to 731 in the embodiment of the present invention are similar to the detailed descriptions of corresponding steps in steps 501 to 537 in another embodiment of the present invention, and for the detailed descriptions of steps 701 to 731 in the embodiment of the present invention, reference may be made to the detailed descriptions of corresponding steps in steps 501 to 537 in another embodiment, which is not repeated herein.

In the mobility management method provided in the embodiment of the present invention, the source base station may determine that the WD needs to be handed over according to the received second measurement report, determine that the WD needs to be handed over individually according to a signal quality indication obtained by the WD, and send a second handover request including a context of the WD to a second target base station corresponding to a second target cell after determining the cell to which the WD needs to be handed over individually, that is, the second target cell. Since the WD does not need to perform the operation of converting the indirect connection with the source base station into the direct connection with the source base station when the WD is switched independently, the problems that the WD consumes a large amount of power and the processing load on the network side is increased are solved.

Fig. 8 is a flowchart of another mobility management method according to an embodiment of the present invention, where a WD is indirectly connected to a network through a UE (where the UE and the WD currently reside in the same cell), and is directly connected to the network, and there is a service being transmitted by the WD currently, if the UE and the WD move together, a situation that the currently residing cell cannot meet a service requirement of the UE may occur, and at this time, to ensure service continuity of the UE, the UE may switch to another cell that can meet the service requirement of the UE, so as to continue to provide a service for the UE through the cell. As shown in fig. 8, the method may include:

801. the source base station sends a first measurement control signaling to the UE.

802. The UE receives a first measurement control signaling sent by a source base station.

803. The UE sends a first measurement report to the source base station.

After the UE receives a first measurement control signaling sent by a source base station, if the UE moves, the UE can measure the signal quality of the current resident cell and the signal quality of each first adjacent cell in a first adjacent cell group, judge whether the signal quality of the current resident cell meets the current service requirement according to a first measurement threshold included in the received first measurement control signaling, judge whether the signal quality of each first adjacent cell meets the current service requirement according to a second measurement threshold included in the first measurement control signaling, and when the UE determines that the signal quality of the current resident cell is lower than the first measurement threshold, the signal quality of the current resident cell cannot meet the current service requirement, and determine that the signal quality of the first adjacent cell existing in the first adjacent cell group is higher than the second measurement threshold, i.e. it indicates that there is a first neighboring cell whose signal quality can meet the current traffic demand, the UE may send a first measurement report to the source base station.

In a first possible implementation manner, the first measurement report may include: SLI, the signal quality of the current resident cell, the signal quality and the identification of each first adjacent cell in the third adjacent cell group, the side link signal strength and the first indication which are measured by the UE; in a second possible implementation manner, the first measurement report may include: SLI, the signal quality of the current resident cell, the signal quality and the identification of each first adjacent cell in the third adjacent cell group, and a second indication.

It should be noted that, the specific description of the parameter included in the first measurement report is similar to the specific description of the parameter included in the first measurement report in step 503 in another embodiment of the present invention, and for the specific description of the parameter included in the first measurement report, reference may be made to the specific description of the corresponding parameter included in the first measurement report in step 503 in another embodiment of the present invention, and the embodiments of the present invention are not described in detail here.

When the first measurement report includes the side link signal strength and the first indication, for example, it is assumed that the side link signal strength included in the first measurement report sent by the UE to the source base station is lower than the threshold, and the first indication is 1, where the first indication and the first indication are used to indicate that the signal quality condition of the side link between the UE and the WD does not satisfy the condition of the common handover, and it is determined that the UE needs to perform the individual handover according to the condition that the signal quality condition of the side link between the UE and the WD does not satisfy the condition of the common handover.

When the second indication is included in the first measurement report, it is assumed that the second indication included in the first measurement report sent by the UE to the source base station is 11, that is, the signal quality of the side link is lower than the threshold, and the signal quality of the side link is deteriorating, which is used to indicate that the signal quality condition of the side link between the UE and the WD does not satisfy the condition of the common handover.

804. The source base station receives a first measurement report sent by the UE.

805. And the source base station determines that the UE needs to be switched independently according to the first measurement report, deletes the association relation between the UE and the WD, allocates new DRB related resources for the WD and determines a target cell.

Wherein, the target cell refers to a neighboring cell of a currently camped cell to which the UE needs to be individually handed over. Corresponding to the first possible implementation manner of the first measurement report in step 803, after the source base station receives the first measurement report sent by the UE, the source base station may determine whether the signal quality of the current camped cell measured by the UE included in the first measurement report is lower than a first measurement threshold, and determine whether the signal quality of each first neighboring cell in the third neighboring cell group included in the first measurement report is higher than a second measurement threshold, and then determine that the UE needs to perform handover according to that the signal quality of the current camped cell is lower than the first measurement threshold, and the signal quality of each first neighboring cell in the third neighboring cell group is higher than the second measurement threshold, and the source base station may determine whether the signal quality condition of the sidelink between the UE and the WD meets the condition of common handover according to the sidelink signal strength and the first indication included in the first measurement report, therefore, whether the UE and the WD need to be jointly switched can be determined according to whether the signal quality condition of the side link between the UE and the WD meets the condition of joint switching. Illustratively, according to the example in step 803, the source base station may determine that the signal quality of the side link between the UE and the WD does not satisfy the condition for the common handover according to that the side link signal strength included in the first measurement report is lower than the threshold, and the first indication is 1, and at this time, the source base station may determine that the UE needs to perform the individual handover according to that the obtained signal quality of the side link between the UE and the WD does not satisfy the condition for the common handover.

Corresponding to the second possible implementation manner of the first measurement report in step 803, after the source base station receives the first measurement report sent by the UE, the source base station may determine whether the signal quality of the current camped cell measured by the UE included in the first measurement report is lower than a first measurement threshold, and determine whether the signal quality of each first neighboring cell in the third neighboring cell group included in the first measurement report is higher than a second measurement threshold, and then determine that the UE needs to perform handover according to that the signal quality of the current camped cell is lower than the first measurement threshold, and the signal quality of each first neighboring cell in the third neighboring cell group is higher than the second measurement threshold, and the source base station may determine whether the signal quality condition of the side link between the UE and WD meets the condition of common handover according to a second indication included in the first measurement report, therefore, whether the UE and the WD need to be jointly switched can be determined according to whether the signal quality condition of the side link between the UE and the WD meets the condition of joint switching. Illustratively, according to the example in step 803, the source base station may determine that the signal quality of the side link between the UE and the WD does not satisfy the condition for the common handover according to the second indication 11 included in the first measurement report, that is, the signal quality of the side link is lower than the threshold and the signal quality of the side link is deteriorating, and then the source base station may determine that the UE needs to perform the individual handover according to the obtained signal quality of the side link between the UE and the WD that does not satisfy the condition for the common handover.

After the source base station determines that the UE needs to perform the individual handover according to the second measurement report, the source base station may determine that the UE and the WD need to be instructed to disconnect the side link therebetween, and further, the source base station determines that an instruction information for instructing to disconnect the side link between the UE and the WD needs to be sent to the UE and the WD, respectively. And the source base station may delete the association between the UE and the WD, specifically delete the correspondence between SLI, L2 ID, SLI, and L2 ID, and the correspondence between SLI and RB ID included in the context of the UE, the ID of the WD (the WD is a device that receives UE relay) in the context of the UE, and may also delete the ID of the UE (the UE is a device that provides relay service for the WD) in the context of the WD. The source base station may further allocate new DRB-related resources to the WD, and select, from the third neighboring cell group, a neighboring cell with the best signal quality measured by the UE as a target cell according to the signal quality and the identity of each first neighboring cell in the third neighboring cell group included in the first measurement report, so as to facilitate individual handover of the UE to the target cell.

806. The source base station sends a first handover request to a target base station corresponding to the target cell.

After the source base station determines, according to the first measurement report, that the UE needs to perform an individual handover, deletes an association relationship between the UE and the WD, allocates a new DRB related configuration to the WD, and determines the target cell, the source base station may send a first handover request to the target base station corresponding to the target cell through an X2 interface, where the first handover request may include: the context of the UE, in which the first RRC context may be included.

807. The target base station receives a first handover request sent by the source base station.

808. And the target base station allocates the access resource and the resource for transmitting the service data according to the first switching request.

Since the first handover request includes no correspondence between SLI and L2 ID and no correspondence between SLI and RB ID in the context of the UE, after the target base station receives the first handover request sent by the source base station, the target base station may determine that the UE is switched to the single UE, and may allocate access resources, where the access resources may include: the target base station can allocate and reserve resources for transmitting the service data for the individual handover of the UE according to the context of the UE included in the first handover request.

809. The target base station sends a first handover request acknowledgement to the source base station.

The first handover request acknowledgement may include a first handover command, where the first handover command may include a first identifier and a first preamble.

810. The source base station receives the first switching request confirmation sent by the target base station.

811. The source base station sends a first RRC link reconfiguration to the UE.

After the source base station receives the first handover request acknowledgement sent by the target base station, the source base station may carry the first handover command included in the first handover request acknowledgement and the indication information described in step 805 together in the first RRC link reconfiguration and send the first RRC link reconfiguration to the UE.

812. The UE receives the first RRC link reconfiguration sent by the source base station.

813. The source base station sends a second RRC link reconfiguration to the WD.

Wherein, the source base station may send the indication information described in step 805 to the WD in the second RRC link reconfiguration.

814. The WD receives a second RRC link reconfiguration transmitted by the source base station.

It should be noted that, in the embodiment of the present invention, the steps 811 to 812 have no precedence in the execution of the steps 813 to 814, that is, after the step 810 is executed, the steps 811 to 812 may be executed first, and then the steps 813 to 814 are executed, or the steps 813 to 814 may be executed first, and then the steps 811 to 812 are executed, where the execution sequence of the steps 811 to 812 and the steps 813 to 814 is not specifically limited in the embodiment of the present invention.

815. And the WD is reconfigured according to the second RRC link, the connection with the UE is disconnected, the corresponding relation between the EBI and the SLI is deleted, and the DRB between the WD and the source base station is established.

After receiving the second RRC link reconfiguration sent by the source base station, the WD may disconnect the connection with the UE and delete the corresponding relationship between the EBI and the SLI according to the indication information included in the second RRC link reconfiguration. In addition, the WD may also establish a DRB between the WD and the source base station according to the new DRB related resources allocated for the WD in step 805 (the new DRB related resources allocated for the WD in step 805 may be carried by the source base station into a second RRC connection reconfiguration and sent to the WD), so as to restore the connection configuration between the WD and the source base station to the connection configuration before the WD accepts the UE relay.

816. WD sends RRC link reconfiguration complete to the source base station.

Wherein, after the WD disconnects from the UE according to the second RRC link reconfiguration, deletes the correspondence between the EBI and the SLI, and establishes the DRB between the WD and the source base station, the WD may send an RRC link reconfiguration complete to the source base station.

817. The source base station receives the RRC link reconfiguration complete sent by WD.

Wherein the source base station may release the side link resource after receiving the RRC link reconfiguration complete sent by the WD.

818. And the UE reconfigures according to the first RRC link to disconnect the connection with the WD, deletes the corresponding relation between the SLI and the L2 ID and the corresponding relation between the SLI and the RB ID, disconnects the connection with the source base station and accesses the target base station.

After step 812 is executed, that is, after the UE receives the first RRC link reconfiguration sent by the source base station, the UE may disconnect the connection with the WD according to the indication information included in the first RRC link reconfiguration, delete the corresponding relationship between the SLI and the L2 ID and the corresponding relationship between the SLI and the RB ID, disconnect the connection with the source base station according to the first handover command, synchronize with the target base station, access the target base station according to the first preamble included in the first handover command, and carry the first identifier when accessing the target base station, so that the target base station determines that the UE accessing the target base station is the UE according to the first identifier, and establish the direct connection between the target base station and the UE according to the context of the UE included in the first handover request.

819. The UE sends a first handover acknowledgement to the target base station.

820. The target base station receives a first handover confirmation sent by the UE.

After steps 801 to 820 are performed, the uplink data channel between the UE and the target base station is successfully established, but the downlink data channel is not established yet, the S-GW can transmit downlink data to the target base station only through the source base station, so that the target base station transmits downlink data to the UE, and at this time, in order to enable the downlink data to be directly transmitted to the target base station from the SGW, the following steps 821 to 831 may be performed:

821. and the target base station sends a first path switching request to the MME.

After the target base station determines that the UE has been successfully switched to the target cell according to the received first handover confirmation, the target base station may send a path switching request of the UE, that is, a first path switching request, to the MME, where the first path switching request may include: TEID, EBI of S1-U that needs modification, UE ID and direct path switch indication. The direct path switch indication is used to inform the MME that the UE has disconnected from the WD.

822. And the MME receives a first path switching request sent by the target base station.

823. The MME deletes the WD ID in the context of the UE and the UE ID in the context of the WD according to the first path switch request.

After receiving the first path switch request sent by the target base station, the MME may delete the ID of the WD (the WD is a device that receives the UE relay) in the context of the UE and may also delete the ID of the UE (the UE is a device that provides the WD with the relay service) in the context of the WD according to the direct path switch indication included in the first path switch request.

824. And the MME sends a bearer modification request to the S-GW according to the first path switching request.

Wherein, modifying the bearer request may include: TEID and EBI of S1-U that needs modification. After the MME deletes the WD ID in the context of the UE and the UE ID in the context of the WD according to the first path switch request, the MME may send the modified bearer request including the TEID included in the first path switch request and the EBI of S1-U that needs to be modified to the S-GW with the TEID and the EBI.

825. And the S-GW receives the bearer modification request sent by the MME and modifies the bearer according to the bearer modification request.

After receiving the bearer modification request sent by the MME, the S-GW may determine, according to the TEID included in the bearer modification request, that the downlink data to be sent to the UE needs to be forwarded by the target base station, instead of being forwarded by the source base station, that is, when the SGW has downlink data to send to the UE, the SGW sends the downlink data to the target base station. And the S-GW performs bearer modification according to the EBI of the S1-U to be modified included in the bearer modification request, and specifically may modify the physical channel for sending the downlink data, that is, the S-GW may modify a first physical channel (the first physical channel is a channel through which the S-GW sends the downlink data to the source base station) into a second physical channel (the second physical channel is a channel through which the S-GW sends the downlink data to the target base station).

826. The S-GW sends a modify bearer reply to the MME.

827. And the MME receives the modified bearer reply sent by the S-GW.

828. The MME sends a path switch acknowledgement to the target base station.

829. And the target base station receives the path switching confirmation sent by the MME.

830. The target base station sends Iu release command to the source base station.

831. And the source base station receives the Iu release command sent by the target base station.

After receiving the Iu release command sent by the target base station, the source base station may release the relevant resources of the UE according to the Iu release command.

It should be noted that, the detailed descriptions of steps 801 to 831 in the embodiment of the present invention are similar to the detailed descriptions of the corresponding steps in steps 501 to 537 in another embodiment of the present invention, and for the detailed descriptions of steps 801 to 831 in the embodiment of the present invention, reference may be made to the detailed descriptions of the corresponding steps in steps 501 to 537 in another embodiment, which is not repeated herein.

The above-mentioned scheme provided by the embodiment of the present invention is introduced mainly from the perspective of interaction between network elements. It will be appreciated that the various network elements, such as the source base station, the target base station and the WD, for implementing the above-described functions, comprise corresponding hardware structures and/or software modules for performing the respective functions. Those of skill in the art will readily appreciate that the present invention can be implemented in hardware or a combination of hardware and computer software, in conjunction with the exemplary algorithm steps described in connection with the embodiments disclosed herein. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

The embodiment of the present invention may perform the division of the functional modules on the source base station, the target base station and the WD according to the above method examples, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It should be noted that, the division of the modules in the embodiment of the present invention is schematic, and is only a logic function division, and there may be another division manner in actual implementation.

In the case of dividing the functional modules according to the respective functions, fig. 9 shows a schematic diagram of a possible composition of the source base station mentioned above and in the embodiment, as shown in fig. 9, the source base station may include: a receiving unit 91, a determining unit 92, and a transmitting unit 93.

The receiving unit 91 is configured to support the source base station to perform step 403 in the mobility management method shown in fig. 4, step 507, step 513, and step 537 in the mobility management method shown in fig. 5, step 607, step 615, step 617, and step 641 in the mobility management method shown in fig. 6, step 704, step 710, step 726, and step 731 in the mobility management method shown in fig. 7, and step 804, step 810, step 817, and step 831 in the mobility management method shown in fig. 8.

A determining unit 92, configured to support the source base station to perform step 404 in the mobility management method shown in fig. 4, step 508 in the mobility management method shown in fig. 5, step 608 in the mobility management method shown in fig. 6, step 705 in the mobility management method shown in fig. 7, where WD needs to be switched separately and a target cell is determined, and step 805 in the mobility management method shown in fig. 8, where UE needs to be switched separately and a target cell is determined.

A sending unit 93, configured to support the source base station to perform step 405 in the mobility management method shown in fig. 4, step 501, step 504, step 509, step 514, and step 517 in the mobility management method shown in fig. 5, step 601, step 604, step 609, step 611, step 618, and step 621 in the mobility management method shown in fig. 6, step 701, step 706, step 711, and step 727 in the mobility management method shown in fig. 7, and step 801, step 806, step 811, and step 813 in the mobility management method shown in fig. 8.

It should be noted that all relevant contents of each step related to the above method embodiment may be referred to the functional description of the corresponding functional module, and are not described herein again.

The source base station provided by the embodiment of the invention is used for executing the mobility management method, so that the same effect as the mobility management method can be achieved.

In case of an integrated unit, fig. 10 shows another possible composition diagram of the source base station involved in the above embodiment. As shown in fig. 10, the source base station includes: a processing module 1001 and a communication module 1002.

Processing module 1001 is configured to control and manage actions of the source base station, for example, processing module 1001 is configured to support the source base station to perform step 404 in fig. 4, step 508 in fig. 5, step 608 in fig. 6, step 705 in fig. 7, to determine that WD requires an individual handover and determine the target cell, step 805 in fig. 8, to determine that UE requires an individual handover and determine the target cell, and/or other processes for the techniques described herein. The communication module 1002 is used for supporting communication between the source base station and other network entities, for example, communication between network entities or functional modules shown in fig. 1 or fig. 3. For example, the communication module 1002 is configured to support the source base station to execute step 403 and step 405 in fig. 4, step 501, step 504, step 507, step 509, step 513, step 514, step 517 and step 537 in fig. 5, step 601, step 604, step 607, step 609, step 611, step 615, step 617, step 618, step 621 and step 641 in fig. 6, step 701, step 704, step 706, step 710, step 711, step 726, step 727 and step 731 in fig. 7, and step 801, step 804, step 806, step 810, step 811, step 813, step 817 and step 831 in fig. 8. The source base station may also include a storage module 1003 for storing program codes and data for the source base station.

The processing module 1001 may be a processor or a controller. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, DSPs, and microprocessors, among others. The communication module 1002 may be a transceiver, a transceiver circuit or a communication interface, etc. The storage module 1003 may be a memory.

When the processing module 1001 is a processor, the communication module 1002 is a transceiver, and the storage module 1003 is a memory, the source base station according to the embodiment of the present invention may be the source base station shown in fig. 2.

In the case of dividing the function modules according to the respective functions, fig. 11 shows a possible composition diagram of the target base station mentioned above and in the embodiment, as shown in fig. 11, the target base station may include: receiving section 1101 and switching section 1102.

Wherein, the receiving unit 1101 is configured to support the target base station to perform step 406 in the mobility management method shown in fig. 4, step 510, step 523, step 525, and step 535 in the mobility management method shown in fig. 5, step 610, step 612, step 627, step 629, step 639 in the mobility management method shown in fig. 6, step 707, step 715, and step 724 in the mobility management method shown in fig. 7, and step 807, step 820, and step 829 in the mobility management method shown in fig. 8.

A handover unit 1102, configured to support the target base station to perform step 407 in the mobility management method shown in fig. 4.

In this embodiment of the present invention, as shown in fig. 12, the target base station may further include: distribution section 1103, and transmission section 1104.

An allocating unit 1103, configured to support the target base station to perform allocating resources, PC5 radio resources, and access resources for transmitting traffic data, which are described in step 511 of the mobility management method shown in fig. 5, allocating resources, PC5 radio resources, and access resources for transmitting traffic data, which are described in step 613 of the mobility management method shown in fig. 6, step 708 of the mobility management method shown in fig. 7, and step 808 of the mobility management method shown in fig. 8.

A sending unit 1104, configured to support the target base station to perform step 512, step 528, and step 536 in the mobility management method shown in fig. 5, step 614, step 616, step 632, and step 640 in the mobility management method shown in fig. 6, step 709, step 716, and step 725 in the mobility management method shown in fig. 7, and step 809, step 821, and step 830 in the mobility management method shown in fig. 8.

The target base station provided by the embodiment of the invention is used for executing the mobility management method, so that the same effect as the mobility management method can be achieved.

In case of an integrated unit, fig. 13 shows another possible composition diagram of the target base station involved in the above embodiment. As shown in fig. 13, the target base station includes: a processing module 1201 and a communication module 1202.

The processing module 1201 is configured to control and manage actions of the target base station, for example, the processing module 1201 is configured to support the target base station to perform the allocating resources for transmitting traffic data, PC5 radio resources and access resources as described in step 511 of fig. 5, the allocating resources for transmitting traffic data, PC5 radio resources and access resources as described in step 613 of the mobility management method shown in fig. 6, step 708 of the mobility management method shown in fig. 7, step 808 of the mobility management method shown in fig. 8, and/or other processes for the technology described herein. The communication module 1202 is configured to support communication between the target base station and other network entities, such as the network entities or functional modules shown in fig. 1 or fig. 3. For example, the communication module 1202 is configured to support the target base station to perform step 406 in fig. 4, step 510, step 512, step 523, step 525, step 528, step 535, step 536 in fig. 5, step 610, step 612, step 614, step 616, step 627, step 629, step 632, step 639, step 640 in fig. 6, step 707, step 709, step 715, step 716, step 724, step 725 in fig. 7, step 807, step 809, step 820, step 821, step 829, step 830 in fig. 8. The target base station may also include a storage module 1203 for storing the program code and data of the source base station.

The processing module 1201 may be a processor or a controller. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, DSPs, and microprocessors, among others. The communication module 1202 may be a transceiver, a transceiver circuit or a communication interface, etc. The storage module 1203 may be a memory.

When the processing module 1201 is a processor, the communication module 1202 is a transceiver, and the storage module 1203 is a memory, the source base station according to the embodiment of the present invention may be the target base station shown in fig. 2.

In the case of the respective functional modules divided with corresponding respective functions, fig. 14 shows a possible schematic composition diagram of the WD referred to above and in the embodiments, as shown in fig. 14, the WD may include: measurement section 1301, transmission section 1302, reception section 1303, access section 1304, and update section 1305.

Wherein, the measurement unit 1301 is configured to support WD to perform step 401 in the mobility management method shown in fig. 4.

A sending unit 1302, configured to support the WD to perform step 402 in the mobility management method shown in fig. 4, step 506 and step 524 in the mobility management method shown in fig. 5, step 606 and step 628 in the mobility management method shown in fig. 6, step 703 and step 714 in the mobility management method shown in fig. 7, and step 816 in the mobility management method shown in fig. 8.

Receiving unit 1303 is configured to support WD to perform step 504 and step 518 in the mobility management method shown in fig. 5, step 605 and step 622 in the mobility management method shown in fig. 6, step 702 and step 712 in the mobility management method shown in fig. 7, and step 814 in the mobility management method shown in fig. 8.

An accessing unit 1304, configured to support the WD to execute the access target base station in step 519 of the mobility management method shown in fig. 5, the access target base station in step 623 of the mobility management method shown in fig. 6, the access target base station in step 713 of the mobility management method shown in fig. 7, and the access target base station in step 818 of the mobility management method shown in fig. 8.

An updating unit 1305, configured to support the WD to execute step 521 in the mobility management method shown in fig. 5 and step 625 in the mobility management method shown in fig. 6.

In an embodiment of the present invention, further, as shown in fig. 15, the WD may further include: disconnection unit 1306, acquisition unit 1307.

A disconnecting unit 1306, configured to support the WD to perform the disconnection from the source base station in step 519 of the mobility management method shown in fig. 5, the disconnection from the source base station in step 623 of the mobility management method shown in fig. 6, the disconnection from the source base station in step 713 of the mobility management method shown in fig. 7, the disconnection from the UE in step 815 of the mobility management method shown in fig. 8, and the access to the target base station in step 818.

An obtaining unit 1307 is configured to support the WD to perform the obtaining of the side link signal strength and the first indication, or the second indication in the mobility management methods shown in fig. 5-8.

The WD provided by the embodiments of the present invention is configured to execute the mobility management method, and therefore, may achieve the same effect as the mobility management method.

In case an integrated unit is employed, fig. 16 shows another possible schematic composition of the WD involved in the above described embodiment. As shown in fig. 16, the WD includes: a processing module 1401 and a communication module 1402.

Processing module 1401 is configured to control and manage an action of the WD, for example, processing module 1401 is configured to support the WD to perform the disconnecting from the source base station according to step 401 in fig. 4, step 519 in fig. 5, access the target base station, step 521, access the target base station according to step 623 in fig. 6, step 625, disconnecting from the source base station according to step 713 in fig. 7, access the target base station, disconnecting from the UE according to step 815 in fig. 8, accessing the target base station according to step 818, and/or other processes for the techniques described herein. The communication module 1402 is used to support communication of the WD with other network entities, such as with the network entities or functional modules shown in fig. 1 or fig. 2. For example, the communication module 1402 is configured to support the WD to perform step 402 in fig. 4, step 504, step 506, step 518, step 524 in fig. 5, step 605, step 606, step 622, step 628 in fig. 6, step 702, step 703, step 712, step 714 in the mobility management method shown in fig. 7, and step 814, step 816 in the mobility management method shown in fig. 8. WD may also include a storage module 1403 for storing program codes and data of the source base station.

The processing module 1401 may be a processor or a controller, among others. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, DSPs, and microprocessors, among others. The communication module 1402 may be a transceiver, a transceiving circuit, a communication interface, or the like. The storage module 1403 may be a memory.

When the processing module 1401 is a processor, the communication module 1402 is a communication interface, and the storage module 1403 is a memory, the WD according to the embodiment of the present invention may be the WD shown in fig. 3.

Through the above description of the embodiments, it is clear to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional modules is merely used as an example, and in practical applications, the above function distribution may be completed by different functional modules according to needs, that is, the internal structure of the device may be divided into different functional modules to complete all or part of the above described functions.

In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described device embodiments are merely illustrative, and for example, the division of the modules or units is only one logical functional division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another device, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may be one physical unit or a plurality of physical units, that is, may be located in one place, or may be distributed in a plurality of different places. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a readable storage medium. Based on such understanding, the technical solution of the present invention may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in the form of a software product, where the software product is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A mobility management method, comprising:

the source base station receives a measurement report sent by the wearable device WD; the WD is directly connected to the source base station, configured to transmit signaling, and indirectly connected to the source base station through a UE, and configured to transmit user plane data, where a measurement report sent by the WD includes: a signal quality indication obtained by the WD, a signal quality of a current camped cell measured by the WD, and a signal quality and an identity of at least one neighboring cell, the signal quality indication indicating a signal quality of a side link between the WD and the UE, and a trend of degradation of the signal quality;

the source base station determines that the WD needs to be switched when the signal quality of the current resident cell obtained by WD measurement is lower than a first measurement threshold and the signal quality of each adjacent cell is higher than a third measurement threshold;

the source base station determines that the WD and the UE need to be jointly switched according to the signal quality indication obtained by the WD;

the source base station determines a first target cell according to the identifier of the adjacent cell included in the measurement report sent by the WD; the first target cell is a cell to which the WD and the UE need to be jointly switched;

the source base station sending a first handover request to a first target base station corresponding to the first target cell, the first handover request including a first relay indication, a context of the UE and a context of the WD, the first relay indication being used for indicating the first target base station to perform a common handover to the WD and the UE, the context of the UE and the context of the WD being used for the first target base station to allocate resources and PC5 wireless resources required for the UE and the WD to access the first target base station, the PC5 wireless resources being used for the WD and the UE to update side link resources between the WD and the UE;

wherein the context of the UE comprises a first Radio Resource Control (RRC) context, an L2 ID allocated by the source base station to the WD for distinguishing data packets of the WD and the UE, an identifier of a side link between the WD and the UE, a corresponding relationship between the L2 ID and the identifier of the side link, and a corresponding relationship between the identifier of the side link and an identifier of a radio bearer resource, and the identifier of the radio bearer resource is an identifier of a radio bearer resource between the UE and the source base station;

the context of the WD comprises a second radio resource control, RRC, context comprising an identity carried for an evolved packet system between the WD and a core network.

2. The method according to claim 1, further comprising, before the source base station determining the first target cell based on the identity of the neighbor cells included in the measurement report sent by the WD:

the source base station receives a measurement report sent by the UE; the measurement report sent by the UE comprises: the signal quality indication obtained by the UE, the signal quality of the current resident cell measured by the UE, and the signal quality of at least one adjacent cell;

the source base station determines that the UE needs to perform switching operation when the signal quality of the current resident cell measured by the UE is lower than the first measurement threshold and the signal quality of each adjacent cell is higher than a second measurement threshold;

the source base station determines that the WD and the UE need to be jointly switched according to the signal quality indication obtained by the WD, and the method comprises the following steps:

and the source base station determines that the WD and the UE need to be jointly switched according to the signal quality indication obtained by the WD and the signal quality indication obtained by the UE.

3. The method according to claim 2, wherein when there are at least two WDs indirectly connected to the source base station through the UE, the measurement report sent by the UE further comprises: before determining that the WD and the UE need to perform a common handover, the side link identification SLI further includes:

and the source base station determines the WD corresponding to the SLI from the at least two WDs as the WD needing to be jointly switched with the UE.

4. The method according to claim 2 or 3, wherein the measurement report sent by the UE further comprises: an identity of the at least one neighboring cell;

the determining, by the source base station, a first target cell according to an identifier of a neighboring cell included in a measurement report sent by the WD includes:

the source base station selects an alternative cell group from at least one adjacent cell included in the measurement report sent by the WD and at least one adjacent cell included in the measurement report sent by the UE, wherein the alternative cell group includes at least one alternative cell;

when the alternative cell group comprises one alternative cell, the source base station determines the alternative cell as the first target cell;

when the candidate cell group comprises at least two candidate cells, the source base station determines the cell with the best signal quality measured by the UE in the at least two candidate cells as the first target cell.

5. The method of claim 1, further comprising, after the source base station sends a first handover request to a first target base station corresponding to the first target cell:

the source base station receives a first switching request confirmation sent by the first target base station; wherein the first handover request acknowledgement includes a second relay indication, a first handover command, and a second handover command; the second relay indicating an acknowledgement to inform the source base station that the first handover request acknowledgement is for a common handover of the UE and the WD, the first handover command including resources required by the UE to access the first target base station and the PC5 radio resources, the second handover command including resources required by the WD to access the first target base station and the PC5 radio resources;

the source base station sends the first handover command to the UE and sends the second handover command to the WD.

6. The method of claim 1, further comprising:

the source base station determines that the WD needs to be switched independently according to the signal quality indication obtained by the WD;

the source base station determines a cell with the best signal quality in adjacent cells included in the measurement report sent by the WD as a second target cell; the second target cell is a cell to which the WD needs to be independently switched;

the source base station sends a second handover request to a second target base station corresponding to the second target cell, where the second handover request includes a context of the WD.

7. The method of claim 6, further comprising, after the source base station sends a second handover request to a second target base station corresponding to the second target cell:

the source base station receives a second switching request confirmation sent by the second target base station; wherein the second handover request acknowledgement includes resources required by the WD to access the second target base station;

the source base station sends a third handover command and indication information to the WD, wherein the third handover command comprises resources required by the WD to access the second target base station, and the indication information is used for indicating the WD to disconnect the side link with the UE.

8. The method according to any of claims 2-3 and 5-7, wherein the determining, by the source base station, that the WD and the UE need to be jointly switched according to the signal quality indication obtained by the WD and the signal quality indication obtained by the UE comprises:

the source base station determines that the WD and the UE need to be jointly switched according to side link signal strength and a first indication obtained by the WD and the side link signal strength and the first indication obtained by the UE, wherein the side link signal strength is used for representing the signal quality of a side link between the WD and the UE, and the first indication is used for indicating the degradation trend of the signal quality of the side link between the WD and the UE; alternatively, the first and second electrodes may be,

and the source base station determines that the WD and the UE need to be jointly switched according to a second indication obtained by the WD and the second indication obtained by the UE, wherein the second indication is used for indicating the degradation trend of the signal quality of the side link between the WD and the UE and the signal quality of the side link between the WD and the UE.

9. A mobility management method, comprising:

a target base station receives a first switching request sent by a source base station, wherein the first switching request comprises a first relay instruction, a context of UE and a context of WD, the first relay instruction is used for instructing the target base station to execute common switching on wearable equipment WD and user equipment UE, and the WD is directly connected with the source base station, is used for transmitting signaling, is indirectly connected with the source base station through the UE and is used for transmitting user plane data; the context of the UE and the context of the WD are used for the target base station to allocate resources required for accessing the target base station and PC5 radio resources for the UE and the WD, the PC5 radio resources are used for the WD and the UE to update side link resources between the WD and the UE;

the target base station performing a common handover to the WD and the UE according to the first handover request;

10. The method of claim 9, wherein the target base station performs a common handover for the WD and the UE according to the first handover request, comprising:

the target base station multiplexes the context of the UE and the context of the WD, and allocates resources and PC5 wireless resources required for accessing the target base station to the UE and the WD according to the context of the UE and the context of the WD;

the target base station sends a first switching request confirmation to the source base station; wherein the first handover request acknowledgement includes a second relay indication, a first handover command, and a second handover command; the second relay indication is to inform the source base station that the first handover request acknowledgement is an acknowledgement for a common handover of the UE and the WD, the first handover command includes resources required by the UE to access the target base station and the PC5 radio resources, and the second handover command includes resources required by the WD to access the target base station and the PC5 radio resources.

11. The method of claim 9, further comprising:

the target base station receives a second handover request sent by the source base station, wherein the second handover request comprises the context of the WD.

12. The method of claim 11, further comprising, after the target base station receives the second handover request sent by the source base station:

the target base station allocates DRB resources required by data transmission with the target base station and resources required by accessing the target base station for the WD according to the context of the WD;

the target base station sends a second switching request confirmation to the source base station; wherein the second handover request acknowledgement includes resources required by the WD to access the target base station.

13. The method according to claim 11 or 12, characterized in that the method further comprises:

the target base station sends a direct path switching indication to a Mobility Management Entity (MME), wherein the direct path switching indication is used for informing the MME that the WD is disconnected from a side link between the WD and the UE.

14. A mobility management method, comprising:

the wearable device WD measures the signal quality of the current resident cell and measures the signal quality of at least one neighboring cell; the WD is directly connected with a source base station, is used for transmitting signaling, is indirectly connected with the source base station through User Equipment (UE) and is used for transmitting user plane data;

the WD sends a measurement report to the source base station when the WD determines that the measured signal quality of the current resident cell is lower than a first measurement threshold and the signal quality of a cell existing in a neighboring cell of the current resident cell is higher than a third measurement threshold; wherein the measurement report sent by the WD includes: a signal quality indication obtained by the WD, a signal quality of the current camped cell measured by the WD, and a signal quality and an identity of at least one neighboring cell having a signal quality higher than the third measurement threshold, the signal quality indication indicating a signal quality of a side link between the WD and the UE and a trend of degradation of the signal quality;

the WD receives a second handover command sent by the source base station, wherein the second handover command comprises resources required by the WD to access a target base station and PC5 wireless resources, the resources required by the WD to access the target base station comprise an L2 ID and a preamble used for accessing the WD to the target base station, and the L2 ID is an identifier allocated by the source base station to the WD;

the WD accesses the target base station according to the lead code and carries the L2 ID when accessing the target base station;

the WD updates side link resources between the WD and the UE based on the PC5 radio resources.

15. The method of claim 14, wherein after the sending the measurement report to the source base station, further comprising:

the WD receives a third handover command and indication information sent by the source base station, wherein the third handover command comprises resources required by the WD to access the target base station;

and the WD accesses the target base station according to the resources required by accessing the target base station and disconnects the side link with the UE according to the indication information.

16. The method according to claim 14 or 15, wherein before said sending the measurement report to the source base station, further comprising:

the WD obtaining a side link signal strength representing a signal quality of a side link between the WD and the UE and a first indication indicating a trend of degradation of the signal quality of the side link between the WD and the UE to obtain the signal quality indication; alternatively, the first and second electrodes may be,

the WD obtains a second indication to obtain the signal quality indication, the second indication indicating a trend of degradation of signal quality of a side link between the WD and the UE and a side link between the WD and the UE.

17. A source base station, comprising:

a receiving unit, configured to receive a measurement report sent by the wearable device WD; the WD is directly connected to the source base station, configured to transmit signaling, and indirectly connected to the source base station through a UE, and configured to transmit user plane data, where a measurement report sent by the WD includes: a signal quality indication obtained by the WD, a signal quality of a current camped cell measured by the WD, and a signal quality and an identity of at least one neighboring cell, the signal quality indication indicating a signal quality of a side link between the WD and the UE, and a trend of degradation of the signal quality;

a determining unit, configured to determine that, when it is determined that the signal quality of the current camped cell obtained by the WD measurement received by the receiving unit is lower than a first measurement threshold and that the signal quality of each of the neighboring cells received by the receiving unit is higher than a third measurement threshold, the WD needs to perform a handover operation, determine that the WD and the UE need to perform a common handover according to a signal quality indication obtained by the WD received by the receiving unit, and determine a first target cell according to an identifier of a neighboring cell included in a measurement report sent by the WD received by the receiving unit; the first target cell is a cell to which the WD and the UE need to be jointly switched;

a sending unit, configured to send a first handover request to a first target base station corresponding to the first target cell determined by the determining unit, where the first handover request includes a first relay indication, a context of the UE, and a context of the WD, the first relay indication is used to indicate the first target base station to perform a common handover to the WD and the UE, the context of the UE and the context of the WD are used for the first target base station to allocate, to the UE and the WD, resources and PC5 radio resources required for accessing the first target base station, and the PC5 radio resources are used for the WD and the UE to update side link resources between the WD and the UE;

18. The source base station of claim 17,

the receiving unit is further configured to receive a measurement report sent by the UE; the measurement report sent by the UE comprises: the signal quality indication obtained by the UE, the signal quality of the current resident cell measured by the UE, and the signal quality of at least one adjacent cell;

the determining unit is further configured to determine that the UE needs to perform a handover operation when it is determined that the signal quality of the current camped cell measured by the UE received by the receiving unit is lower than the first measurement threshold and the signal quality of each of the neighboring cells received by the receiving unit is higher than a second measurement threshold;

the determining unit is specifically configured to determine that the WD and the UE need to perform a common handover according to the signal quality indication obtained by the WD and the signal quality indication obtained by the UE that are received by the receiving unit.

19. The source base station according to claim 18, wherein when there are at least two WDs indirectly connected to the source base station through the UE, the measurement report transmitted by the UE received by the receiving unit further comprises: side link identification, SLI;

the determining unit is further configured to determine, from the at least two WDs, that the WD corresponding to the SLI is a WD to be jointly switched with the UE.

20. The source base station according to claim 18 or 19, wherein the measurement report sent by the UE and received by the receiving unit further comprises: an identity of the at least one neighboring cell;

the determining unit is specifically configured to:

selecting an alternative cell group from at least one neighboring cell included in the measurement report sent by the WD and at least one neighboring cell included in the measurement report sent by the UE, wherein the alternative cell group includes at least one alternative cell;

when the alternative cell group comprises one alternative cell, determining the alternative cell as the first target cell;

when the candidate cell group comprises at least two candidate cells, determining a cell with the best signal quality measured by the UE in the at least two candidate cells as the first target cell.

21. The source base station of claim 17,

the receiving unit is further configured to receive a first handover request acknowledgement sent by the first target base station; wherein the first handover request acknowledgement includes a second relay indication, a first handover command, and a second handover command; the second relay indicating an acknowledgement to inform the source base station that the first handover request acknowledgement is for a common handover of the UE and the WD, the first handover command including resources required by the UE to access the first target base station and the PC5 radio resources, the second handover command including resources required by the WD to access the first target base station and the PC5 radio resources;

the sending unit is further configured to send the first handover command received by the receiving unit to the UE, and send the second handover command received by the receiving unit to the WD.

22. The source base station of claim 17,

the determining unit is further configured to determine that the WD needs to be switched independently according to the signal quality indication obtained by the WD and received by the receiving unit;

the determining unit is further configured to determine, as a second target cell, a cell with the best signal quality in neighboring cells included in the measurement report sent by the WD and received by the receiving unit; the second target cell is a cell to which the WD needs to be independently switched;

the sending unit is further configured to send a second handover request to a second target base station corresponding to the second target cell determined by the determining unit, where the second handover request includes a context of the WD.

23. The source base station of claim 22,

the receiving unit is further configured to receive a second handover request acknowledgement sent by the second target base station; wherein the second handover request acknowledgement includes resources required by the WD to access the second target base station;

the sending unit is further configured to send a third handover command and indication information to the WD, where the third handover command includes a resource required by the WD to access the second target base station and received by the receiving unit, and the indication information is used to indicate that the WD disconnects a side link with the UE.

24. The source base station according to any of claims 18-19 and 21-23, wherein the determining unit is specifically configured to:

determining that the WD and the UE need to be jointly switched according to a side link signal strength and a first indication obtained by the WD and the side link signal strength and the first indication obtained by the UE, wherein the side link signal strength is used for representing the signal quality of a side link between the WD and the UE, and the first indication is used for indicating the degradation trend of the signal quality of the side link between the WD and the UE; alternatively, the first and second electrodes may be,

and determining that the WD and the UE need to be jointly switched according to a second indication obtained by the WD and the second indication obtained by the UE, wherein the second indication is used for indicating the deterioration trend of the signal quality of the side link between the WD and the UE and the signal quality of the side link between the WD and the UE.

25. A target base station, comprising:

a receiving unit, configured to receive a first handover request sent by a source base station, where the first handover request includes a first relay indication, a context of a UE, and a context of a WD, where the first relay indication is used to indicate a target base station to perform a common handover on a wearable device WD and a user equipment UE, and the WD is directly connected to the source base station, is used to transmit a signaling, is indirectly connected to the source base station through the UE, and is used to transmit user plane data; the context of the UE and the context of the WD are used for the target base station to allocate resources required for accessing the target base station and PC5 radio resources for the UE and the WD, the PC5 radio resources are used for the WD and the UE to update side link resources between the WD and the UE;

a handover unit configured to perform a common handover for the WD and the UE according to the first handover request received by the reception unit;

26. The target base station of claim 25, wherein the handover unit is specifically configured to:

multiplexing the context of the UE and the context of the WD received by the receiving unit, and allocating resources required for accessing the target base station and PC5 wireless resources for the UE and the WD according to the context of the UE and the context of the WD;

sending a first handover request acknowledgement to the source base station; wherein the first handover request acknowledgement includes a second relay indication, a first handover command, and a second handover command; the second relay indication is to inform the source base station that the first handover request acknowledgement is an acknowledgement for a common handover of the UE and the WD, the first handover command includes resources required by the UE to access the target base station and the PC5 radio resources, and the second handover command includes resources required by the WD to access the target base station and the PC5 radio resources.

27. The target base station of claim 25,

the receiving unit is further configured to receive a second handover request sent by the source base station, where the second handover request includes a context of the WD.

28. The target base station of claim 27, further comprising:

an allocating unit, configured to allocate, according to the context of the WD received by the receiving unit, a data radio bearer DRB resource required for data transmission with the target base station and a resource required for accessing the target base station for the WD;

a sending unit, configured to send a second handover request acknowledgement to the source base station; wherein the second handover request acknowledgement includes the resources allocated by the allocation unit and required by the WD to access the target base station.

29. The target base station of claim 28,

the sending unit is further configured to send a direct path switching indication to a mobility management entity MME, where the direct path switching indication is used to notify the MME that the WD has disconnected a side link with the UE.

30. A Wearable Device (WD) comprising:

a measuring unit, configured to measure the signal quality of a currently camped cell, and measure the signal quality of at least one neighboring cell; the WD is directly connected with a source base station, is used for transmitting signaling, is indirectly connected with the source base station through User Equipment (UE) and is used for transmitting user plane data;

a sending unit, configured to send a measurement report to the source base station when it is determined that the signal quality of the current camped cell measured by the measuring unit is lower than a first measurement threshold and the signal quality of a cell existing in a neighboring cell of the current camped cell is higher than a third measurement threshold; wherein the measurement report sent by the WD includes: a signal quality indication obtained by the WD, a signal quality of the currently camped cell measured by the measurement unit, and a signal quality and an identity of at least one neighboring cell having a signal quality higher than the third measurement threshold, the signal quality indication indicating a signal quality of a side link between the WD and the UE and a trend of degradation of the signal quality;

a receiving unit, configured to receive a second handover command sent by the source base station, where the second handover command includes resources required by the WD to access a target base station and PC5 wireless resources, the resources required by the WD to access the target base station include an L2 ID and a preamble used by the WD to access the target base station, and the L2 ID is an identifier allocated by the source base station to the WD; the access unit is used for accessing the target base station according to the lead code and carrying the L2 ID when accessing the target base station;

an updating unit, configured to update the side link resource between the WD and the UE according to the PC5 wireless resource received by the receiving unit.

31. The WD of claim 30, further comprising: a disconnection unit;

the receiving unit is further configured to receive a third handover command and indication information sent by the source base station, where the third handover command includes a resource required by the WD to access the target base station;

the access unit is further configured to access the target base station according to the resource received by the receiving unit and required for accessing the target base station;

the disconnection unit is configured to disconnect the side link with the UE according to the indication information received by the receiving unit.

32. The WD of claim 30 or 31, further comprising: an acquisition unit configured to:

obtaining a side link signal strength representing a signal quality of a side link between the WD and the UE and a first indication indicating a trend of degradation of the signal quality of the side link between the WD and the UE to obtain the signal quality indication; alternatively, the first and second electrodes may be,

obtaining a second indication to obtain the signal quality indication, the second indication indicating a trend of degradation of a signal quality of a side link between the WD and the UE and a signal quality of a side link between the WD and the UE.

33. A source base station, comprising: a processor, a memory, and a transceiver;

the memory is configured to store computer-executable instructions, and when the source base station is running, the processor executes the computer-executable instructions stored by the memory to cause the source base station to perform the mobility management method according to any one of claims 1 to 8.

34. A target base station, comprising: a processor, a memory, and a transceiver;

the memory is configured to store computer-executable instructions, and when the target base station is running, the processor executes the computer-executable instructions stored in the memory to cause the target base station to perform the mobility management method according to any one of claims 9 to 13.

35. A Wearable Device (WD) comprising: a processor, a memory, and a transceiver;

the memory is configured to store computer-executable instructions that, when the WD is operating, the processor executes to cause the WD to perform the mobility management method of any of claims 14-16.