CN117042071A

CN117042071A - Mobility management method, device and equipment

Info

Publication number: CN117042071A
Application number: CN202311296141.8A
Authority: CN
Inventors: 沈睿
Original assignee: New H3C Technologies Co Ltd
Current assignee: New H3C Technologies Co Ltd
Priority date: 2023-09-28
Filing date: 2023-09-28
Publication date: 2023-11-10

Abstract

The invention provides a mobility management method, a mobility management device and mobility management equipment. According to the invention, the first gNB of the target cell sends the error indication message to the first AMF accessed by the first gNB through the NG interface, so that the first AMF forwards the first switching report message to the second gNB of the source cell, and the second gNB adjusts the switching parameters between the source cell and the target cell according to the indication of the first switching report message, thereby realizing the purpose of sending the error indication message to the source cell and enabling the source cell to perform self-optimization of the switching parameters in the scene of NG switching failure between stations.

Description

Mobility management method, device and equipment

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a mobility management method, apparatus, and device.

Background

In 5G mobile network construction, mobility management functions play an increasingly important role. In mobility management, if the configuration of the handover parameters is not reasonable, handover failure occurs when the terminal device is handed over from the source cell to the target cell, so that radio link failure (Radio Link Failure, RLF) occurs in the terminal device, which seriously affects user experience and wastes system resources. In this scenario, network maintenance personnel can reduce the probability of handover failure by setting a reasonable neighbor cell offset. However, in the existing network, network maintenance personnel often cannot set reasonable adjacent cell offset or the adjacent cell offset is modified inappropriately, so that the network maintenance is difficult, the manual intervention degree is high, the labor cost is high, and the like.

In the case of an XN handover failure, the target cell may send an error indication message to the source cell through the XN link, and the source cell performs handover failure detection and handover parameter optimization according to the error indication message, thereby reducing RLF caused by unreasonable handover parameter setting, dynamically improving the handover success rate in the network, and reducing the labor maintenance cost in the network optimization process. However, in the case of NG handover failure between stations, the source cell cannot perform handover parameter optimization because the target cell cannot send the error indication message to the source cell. However, when the terminal device is handed over from the source cell to the target cell, a handover failure often occurs, however, the prior art does not have a processing manner when NG the handover failure.

Disclosure of Invention

In order to overcome the problems in the prior art, the invention provides a mobility management method, a mobility management device and mobility management equipment, which are used for solving the problem that a source cell cannot perform self-optimization of a handover parameter under a NG handover failure scene.

According to a first aspect of an embodiment of the present invention, there is provided a mobility management method applied to a first gNB, the method including:

receiving a Radio Resource Control (RRC) reestablishment request sent by a first terminal device, wherein the RRC reestablishment request is initiated to a first gNB for providing service for a first cell after the first terminal device fails to switch from a second cell to the first cell;

Based on the RRC reestablishment request, sending an error indication message to a first access mobile management function network element AMF accessed by the first gNB through an NG interface; the error indication message carries a physical cell identifier PCI corresponding to a second cell, so that the first AMF sends a first switching report message to a second gNB corresponding to the PCI and serving the second cell; the first handover report message is configured to instruct the second gNB to adjust a handover parameter between the second cell and the first cell, so that other terminal devices are successfully handed over from the second cell to the first cell based on the adjusted handover parameter.

In some embodiments, the NG interface binds a plurality of stream control transmission protocol SCTP links;

the sending, by the NG interface, an error indication message to a first AMF accessed by the first gNB includes: selecting a target link from a plurality of SCTP links bound by the NG interface; and sending the error indication message to a first AMF accessed by the first gNB through the target link.

In some embodiments, selecting a target link from a plurality of SCTP links bound by the NG interface comprises:

Acquiring the number of link configuration update messages corresponding to each SCTP link in a set time period; when any SCTP link changes, the first AMF sends a link configuration update message to the first gNB through the SCTP link, so that the first gNB updates the recorded times of the link configuration update message corresponding to the SCTP link after receiving the link configuration update message through the SCTP link;

and determining the SCTP link with the least frequency of receiving the configuration update message as a target link according to the frequency of the configuration update message corresponding to each SCTP link.

In some embodiments, after receiving the RRC reestablishment request sent by the first terminal device, the method further includes:

determining a first switching failure type when the first terminal equipment fails to switch from the second cell to a first cell according to the RRC reestablishment request; the first switching failure type is switching too late, switching to an error cell or switching in a ping-pong manner;

the first handover report message carries a first handover failure type, so that when the occurrence frequency of the handover failure type in a set time period meets a preset adjustment condition, a second gNB adjusts handover parameters between the second cell and the first cell based on the first handover failure type, so that other terminal equipment is successfully handed over from the second cell to the first cell based on the adjusted handover parameters.

In some embodiments, the method further comprises:

the first gNB receives a second switching report message sent by the first AMF, wherein the second switching report message carries a second switching failure type; the second switching failure type is switching too late, switching to an error cell or switching in a ping-pong manner; after the second terminal equipment fails to switch from the first cell to the third cell, triggering the first AMF to be sent to the first gNB by the third gNB serving the third cell;

and if the occurrence times of the second switching failure type in the set time period meets a preset adjustment condition, adjusting switching parameters between the first cell and the third cell based on the second switching failure type, so that other terminal equipment is successfully switched from the first cell to the third cell based on the adjusted switching parameters.

According to a second aspect of an embodiment of the present invention, there is provided a mobility management method applied to a first AMF, the method including:

receiving an error indication message sent by the first gNB, and searching a physical cell identifier PCI of a second cell in the error indication message in a cell management list, wherein the error indication message is sent by the first cell when an RRC reestablishment request sent by first terminal equipment is received, and the RRC reestablishment request is initiated to the first gNB for providing service for the first cell after the first terminal equipment fails to switch from the second cell to the first cell;

If the PCI of the second cell is found, a first switching report message is sent to a second gNB for providing service for the second cell based on the PCI;

if the PCI of the second cell is not found, determining a second AMF for providing service for the second cell corresponding to the PCI from a 5G network so as to trigger the second AMF to send a first handover report message to a second gNB for providing service for the second cell; the first handover report message is configured to instruct the second gNB to adjust a handover parameter between the second cell and the first cell, so that other terminal devices are successfully handed over from the second cell to the first cell based on the adjusted handover parameter.

In some embodiments, the PCI corresponds to a plurality of cells; the error indication message also comprises a radio network temporary identifier RNTI of the first terminal equipment;

the sending, based on the PCI, a first handover report message to a second gNB serving the second cell, including:

selecting a cell matched with the RNTI from a plurality of cells corresponding to the PCI as a second cell according to the RNTI, and sending a first switching report message to a second gNB serving the second cell;

The determining, from the 5G network, a second AMF for providing services for the second cell corresponding to the PCI, including:

and selecting an AMF matched with the RNTI from the AMFs for providing service for a plurality of cells corresponding to the PCI as a second AMF according to the RNTI.

According to a third aspect of embodiments of the present invention, there is provided a mobility management device, the device being applied to a first gNB, the device comprising:

a first receiving unit, configured to receive a radio resource control RRC reestablishment request sent by a first terminal device, where the RRC reestablishment request is initiated to a first gNB that provides a service for a first cell after a failure of the first terminal device to switch from a second cell to the first cell;

a first management unit, configured to send an error indication message to a first access mobility management function network element AMF accessed by the first gNB through an NG interface based on the RRC reestablishment request; the error indication message carries a second physical cell identifier PCI corresponding to a second cell, so that the first AMF sends a first switching report message to a second gNB corresponding to the second PCI and providing service for the second cell; the first handover report message is configured to instruct the second gNB to adjust a handover parameter between the second cell and the first cell, so that other terminal devices are successfully handed over from the second cell to the first cell based on the adjusted handover parameter.

According to a fourth aspect of embodiments of the present invention, there is provided a mobility management device applied to a first access mobility management function, AMF, accessed by a first gNB, the device comprising:

a second receiving unit, configured to receive an error indication message sent by the first gNB, and find a physical cell identifier PCI of a second cell in the error indication message in a cell management list, where the error indication message is sent by a first cell when receiving an RRC reestablishment request sent by a first terminal device, and the RRC reestablishment request is initiated to a first gNB that provides a service for the first cell after a failure of the first terminal device to switch from the second cell to the first cell;

a second management unit, configured to send a first handover report message to a second gNB that provides a service for the second cell based on the PCI, if the PCI of the second cell is found; under the condition that the PCI of the second cell is not found, determining a second AMF (advanced mobile switching center) for providing service for the second cell corresponding to the PCI from a 5G networking to trigger the second AMF to send a first switching report message to a second gNB for providing service for the second cell; the first handover report message is configured to instruct the second gNB to adjust a handover parameter between the second cell and the first cell, so that other terminal devices are successfully handed over from the second cell to the first cell based on the adjusted handover parameter.

According to a fifth aspect of embodiments of the present invention there is provided an apparatus comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor performs a method as described in any of the above.

According to a sixth aspect of embodiments of the present invention there is provided a computer readable storage medium having stored thereon computer instructions which when executed by a processor perform the steps of a method as described in any of the above.

According to one or more embodiments of the present disclosure, a first gNB of a target cell sends an error indication message to a first AMF accessed by the first gNB through an NG interface, so that the first AMF forwards a first handover report message to a second gNB of a source cell, and the second gNB adjusts handover parameters between the source cell and the target cell according to an indication of the first handover report message, thereby achieving the purpose of sending the error indication message to the source cell and performing handover parameter self-optimization in a situation of failure of NG handover between stations.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

Fig. 1a is a schematic diagram of a 5G network according to an exemplary embodiment of the present invention.

Fig. 1b is a schematic diagram of a framework of another 5G network according to an exemplary embodiment of the present invention.

Fig. 2 is a flow chart illustrating a mobility management method applied to a first gNB according to an exemplary embodiment of the invention.

Fig. 3 is a flowchart illustrating a mobility management method applied to a first AMF according to an exemplary embodiment of the invention.

Fig. 4 is a schematic diagram illustrating a method of transmitting a handover report message according to an exemplary embodiment of the present invention.

Fig. 5 is a schematic diagram illustrating another method of transmitting a handover report message according to an exemplary embodiment of the present invention.

Fig. 6 is a schematic diagram of an apparatus according to an exemplary embodiment of the present invention.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the invention. Rather, they are merely examples of apparatus and methods consistent with aspects of the invention as detailed in the accompanying claims.

It should be noted that: in other embodiments, the steps of the corresponding method are not necessarily performed in the order shown and described. In some other embodiments, the method may include more or fewer steps than described herein. Furthermore, individual steps described in this disclosure may be broken down into multiple steps in other embodiments; while various steps described in this invention may be combined into a single step in other embodiments.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.

It should be understood that although the terms first, second, third, etc. may be used herein to describe various information, these information should not be limited by these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the invention. The word "if" as used herein may be interpreted as "at … …" or "at … …" or "responsive to a determination", depending on the context.

In the case of NG handover failure between stations, since there is no XN link between the target cell and the source cell, the target cell cannot send an error indication message to the source cell, and thus the source cell cannot perform handover parameter optimization.

In view of this, the present invention provides a mobility management method to solve the problem that the source cell cannot perform the self-optimization of the handover parameters in the NG handover failure scenario.

The following examples are presented to illustrate the method of the present invention with reference to the accompanying drawings.

Fig. 1a and fig. 1b are schematic diagrams of the frames of two 5G networks according to an exemplary embodiment of the present invention, and as shown in fig. 1a, a terminal device 101 moves from a source cell to a target cell, a first base station 102 provides communication resources for the target cell, a second base station 103 provides communication resources for the source cell, and the second base station 102 and the first base station 103 access a first access mobility management function network element (Access and Mobility Management Function, AMF) 104. As shown in fig. 1b, the first base station 102 accesses a first AMF and the second base station 103 accesses a second AMF. That is, fig. 1a and 1b differ in that the first base station 102 and the second base station 103 access the same AMF in fig. 1a, and the first base station 102 and the second base station 103 access different AMFs in fig. 1 b. The inter-station NG handover in this embodiment means that seamless handover from the second base station 103 to the first base station 102 is achieved through the NG interface during the movement of the terminal device 101.

In the NG handover scenario, the terminal device may handover from cell a (source cell) to cell B (target cell); the terminal device may also be handed over from cell B (source cell) to cell C (target cell). That is, the cell B may be a source cell or a target cell. In this embodiment, for convenience of description, the cell B is represented by a first cell, the cell a is represented by a second cell in the handover from the cell a to the cell B, and the cell C is represented by a third cell in the handover from the cell B to the cell C. It should be understood by those skilled in the art that the third cell may also be cell a, where the first cell, the second cell, and the cell referred to by the third cell need to be determined according to a specific handover scenario. In the following embodiments, in order to facilitate understanding of the first cell and the target cell, and the second cell and the source cell may alternate, it will be understood by those skilled in the art that they have the same meaning.

The following embodiments will describe steps performed in a first gNB serving a first cell in conjunction with fig. 2.

Fig. 2 is a flow chart illustrating a mobility management method applied to a first gNB according to an exemplary embodiment of the present invention, and as shown in fig. 2, the mobility management method includes the following steps 201 to 202.

In step 201, a radio resource control RRC reestablishment request sent by a first terminal device is received.

A radio resource control (Radio Resource Control, RRC) reestablishment request is initiated to a first gNB serving a first cell after a failure of the first terminal device to handover from a second cell to the first cell.

In the present embodiment, in order to distinguish from the terminal apparatuses mentioned later, the terminal apparatus handed over from the second cell (source cell) to the first cell (target cell) is referred to as a first terminal apparatus.

In step 202, based on the RRC reestablishment request, an error indication message is sent to a first access mobility management function network element AMF accessed by the first gNB through an NG interface.

Under the condition that the first terminal equipment reestablishes the target cell, the target cell generates an error indication message according to a source cell physical cell identifier PCI carried in a reestablishment request sent by the first terminal equipment, and performs integrity protection and encryption processing on a message carrying active cell information to generate a section of code stream information. That is, the error indication message carries a PCI corresponding to a second cell, so that the first AMF sends a first handover report message to a second gNB corresponding to the PCI and serving the second cell; the first handover report message is configured to instruct the second gNB to adjust a handover parameter between the second cell and the first cell, so that other terminal devices are successfully handed over from the second cell to the first cell based on the adjusted handover parameter. The handover parameter may be a neighbor offset (CellIndividualOffset, CIO).

Under the condition that no XN link exists between the target cell and the source cell, the invention can send error indication information to the AMF where the target cell is located through the NG interface and forward the error indication information to the source cell, thereby enabling the source cell to successfully adjust the switching parameters so as to solve the problem that the mobility management cannot be carried out in the current NG switching.

In the present network, the NG interface between the AMF and the base station gNB may bind multiple stream control transmission protocol (Stream Control Transmission Protocol, SCTP) links, which is a protocol that transmits multiple data streams simultaneously between the two ends of the network connection. If the first gNB of the target cell sends the error indication message to all the SCTP links, great signaling overhead is brought, and certain waste is caused to network resources, so that the first gNB can select one of the SCTP links to send the error indication message. To avoid selecting an aged SCTP link to send an error indication message, a target link may be selected from among the plurality of SCTP links bound by the NG interface, and the error indication message may be sent over the selected target link.

In this case, the sending, by the NG interface, an error indication message to the first AMF accessed by the first gNB may include: selecting a target link from a plurality of SCTP links bound by the NG interface; and sending the error indication message to a first AMF accessed by the first gNB through the target link.

And the first AMF sends a link configuration update message to the first gNB under the condition that the first AMF detects that an SCTP link between the first gNB and the first AMF is unstable. That is, the state of the SCTP link may change UP-DOWN, DOWN-UP. Taking UP-DOWN as an example, the first AMF sends a link configuration update message to the first gNB before DOWN if it detects that an SCTP link between the first gNB and the first AMF is about to have an UP-DOWN event. In other words, if the number of times the first gNB receives the link configuration update message of the SCTP link is greater, it is indicated that the SCTP link is unstable, that is, there is a possibility of aging, so the first gNB may select the target link by counting the number of times the link configuration update message is received on each SCTP link.

In some embodiments, selecting the target link from the plurality of SCTP links bound by the NG interface may include: acquiring the number of link configuration update messages corresponding to each SCTP link in a set time period; when any SCTP link changes, the first AMF sends a link configuration update message to the first gNB through the SCTP link, so that the first gNB updates the recorded times of the link configuration update message corresponding to the SCTP link after receiving the link configuration update message through the SCTP link; and determining the SCTP link with the least frequency of receiving the configuration update message as a target link according to the frequency of the configuration update message corresponding to each SCTP link.

For example, when it is detected that the selection switch of the SCTP link is in an on state, aging statistics is performed on each SCTP in a preset period of time, that is, the number of times of link configuration update messages (AMF CONFIGURATION UPDATE) corresponding to each SCTP is counted in a period, then the SCTPs with the least number of times are sorted from low to high and selected for message transmission, and AMF CONFIGURATION UPDATE times corresponding to all SCTPs after the period arrives are set to 0. That is, the first cell may sort according to the number of times of the received link configuration update message, and select the SCTP link with the least number of times to transmit the error indication message.

According to the invention, the first gNB orders the times of receiving the link configuration update message and selects the target link to send the error indication message to the first AMF, so that excessive signaling overhead and resource waste are avoided.

In other embodiments, if the SCTP link selection switch defaults to off, an error indication message may be sent to the first AMF according to the SCTP link selected in the handover procedure.

In order to prevent the second gNB from frequently adjusting the handover parameters, the second gNB may count handover failure types, and enable the second gNB to adjust the handover parameters between the second cell and the first cell based on the handover failure types when a preset adjustment condition is satisfied. Therefore, after receiving the RRC reestablishment request sent by the first terminal device, the method of this embodiment further includes:

For example, the second gNB may record the number of times of handover too late, handover to the wrong cell and ping-pong handover occurring in the set period of time, for example, if the number of times of handover too late and the handover too late rate reach the adjustment threshold at the same time, the second gNB performs handover parameter optimization, that is, adjusts the handover parameters between the source cell and the target cell based on the handover too late type.

The first cell may send a first handover report message as a target cell to the second cell (source cell), and the first cell may also receive a second handover report message sent by the third cell (target cell) as a source cell, so the method may further include:

The first gNB receives a second switching report message sent by the first AMF, wherein the second switching report message carries a second switching failure type; the second switching failure type is switching too late, switching to an error cell or switching in a ping-pong manner; and if the occurrence times of the second switching failure type in the set time period meets a preset adjustment condition, adjusting switching parameters between the first cell and the third cell based on the second switching failure type, so that other terminal equipment is successfully switched from the first cell to the third cell based on the adjusted switching parameters.

In the present embodiment, a terminal device handed over from a third cell (target cell) to a first cell (source cell) is referred to as a second terminal device.

And triggering the first AMF to be sent to the first gNB by the third gNB serving the third cell after the second terminal equipment fails to switch from the first cell to the third cell.

It will be appreciated by those skilled in the art that the first gcb serving the first cell and the third gcb serving the third cell may access the same AMF (i.e., the first AMF) or may access different AMFs. And if the first gNB and the third gNB access the same AMF, triggering the first AMF to send a second switching report message to the first gNB by the third gNB. If the first gNB and the third gNB access different AMFs, that is, the first gNB accesses the first AMF and the third gNB accesses the third AMF, in this case, the third gNB triggers the third AMF to send an error indication message to the first AMF, so that the first AMF sends a second handover report message to the first gNB.

According to the method and the device, according to the switching failure rate threshold and the switching failure frequency threshold which are set to be too late and switched to the wrong cell and under the different switching failure types of ping-pong switching and the failure statistics modes under different scenes, the switching parameters can be effectively optimized according to the different switching failure types, and the instability of the switching model caused by frequent modification of the switching parameters is effectively avoided.

The following embodiments will describe the steps performed in a first access mobility management function network element AMF accessed by a first gNB in connection with fig. 3.

Fig. 3 is a flow chart illustrating a mobility management method applied to a first AMF according to an exemplary embodiment of the invention, as shown in fig. 3, the mobility management method includes:

in step 301, an error indication message sent by the first gNB is received, and a physical cell identifier PCI of a second cell in the error indication message is searched in a cell management list.

The error indication message is sent by a first cell when receiving an RRC reestablishment request sent by a first terminal device, and the RRC reestablishment request is initiated to a first gNB for providing service for the first cell after the first terminal device fails to switch from a second cell to the first cell.

In step 302a, if the PCI of the second cell is found, a first handover report message is sent to a second gNB serving the second cell based on the PCI.

In step 302b, if the PCI of the second cell is not found, determining a second AMF serving the second cell corresponding to the PCI from the 5G network, so as to trigger the second AMF to send a first handover report message to a second gNB serving the second cell.

The first handover report message is configured to instruct the second gNB to adjust a handover parameter between the second cell and the first cell, so that other terminal devices are successfully handed over from the second cell to the first cell based on the adjusted handover parameter.

In the NG handover failure scenario, the first gNB forwards the error indication message to the first AMF where the first gNB is located through the NG interface, and the first AMF performs intermediate forwarding, so as to forward the error indication message to the second gNB corresponding to the second cell.

When the method is implemented, if the first AMF searches the PCI of the second cell in the cell management list, the first gNB and the second gNB are accessed to the same AMF. For example, as shown in fig. 1a, the first gNB102 and the second gNB103 access the first AMF104. In this case, as shown in fig. 4, after the first AMF finds the source cell according to the PCI of the source cell in the error indication message, a handover report message is issued to the second gNB through the NG interface.

If the first AMF does not find the PCI of the second cell in the cell management list, the first gNB and the second gNB are accessed into different AMFs. For example, as shown in fig. 1b, the first gNB102 accesses the first AMF104 and the second gNB103 accesses the second AMF106. As shown in fig. 5, the first AMF obtains the PCI information of the second cell in the error indication message, determines a second AMF corresponding to the second cell according to the PCI information of the second cell, and sends a handover report message to a second gNB of the second cell through the second AMF.

For example, when the first terminal is switched, the second AMF where the source cell is located sends a switching request message to the first AMF where the target cell is located through the NG interface, where the switching request message includes PCI information of the source cell. Therefore, the first AMF can find the second AMF where the source cell is located through the PCI information of the source cell, and then send an error indication message to the second AMF where the source cell is located through the NG interface, so that the second AMF where the source cell is located sends a handover report message to the source cell through the NG interface.

Since the number of PCIs is limited, there is a case where a plurality of cells share the same PCI, in which case the source cell can be further determined from the radio network temporary identity (Radio Network Temporary Indentifier, RNTI) of the terminal device.

In some embodiments, the PCI corresponds to a plurality of cells, and the error indication message further includes a radio network temporary identifier RNTI of the first terminal device;

the sending, based on the PCI, a first handover report message to a second gNB serving the second cell may include: and selecting a cell matched with the RNTI from a plurality of cells corresponding to the PCI as a second cell according to the RNTI, and sending a first switching report message to a second gNB serving the second cell.

For example, when the PCI of the source cell in the error indication message is found in the cell management list, if the number of cells corresponding to the PCI is found to be greater than 1, the RNTI in the error indication message is matched with the RNTI in the handover request message sent by the other gnbs, a second gNB corresponding to the handover request message when the RNTI is matched is obtained, and a handover report message is sent to the second gNB.

In the case that the first gNB and the second gNB access different AMFs, the determining, from the 5G network, the second AMF that serves the second cell corresponding to the PCI may include: and selecting an AMF matched with the RNTI from the AMFs for providing service for a plurality of cells corresponding to the PCI as a second AMF according to the RNTI.

For example, if the first AMF does not find the PCI of the second cell in the cell management list, it indicates that the first gNB and the second gNB access different AMFs. In this case, the first AMF matches the PCI of the source cell with PCIs of source cells in handover request messages sent by other AMFs, if the number of second AMFs corresponding to the handover request messages is greater than 1 during matching, then matches the RNTI in the error indication message with the RNTIs in the handover request messages sent by the plurality of second AMFs, obtains the second AMFs corresponding to the handover request messages during matching, and sends the error indication information to the second AMFs, so that the second AMFs determine the second gnbs corresponding to the source cells and send the handover report messages to the second gnbs according to the PCIs of the source cells in the error indication messages.

The foregoing embodiments illustrate mobility management methods from the perspective of a first gNB and a first AMF, respectively, and for better understanding of the present solution, the following embodiments provide a mobility management system, which includes the first gNB and the first AMF;

the first gNB is configured to receive a radio resource control RRC reestablishment request sent by a first terminal device, and send an error indication message to a first AMF accessed by the first gNB through an NG interface based on the RRC reestablishment request; the RRC reestablishment request is initiated to a first gNB for providing service for the first cell after the first terminal equipment fails to switch from the second cell to the first cell, and the error indication message carries the PCI of the second cell;

The first AMF is configured to receive an error indication message sent by the first gNB, search a cell management list for a PCI of a second cell in the error indication message, and if the PCI of the second cell is found, send a first handover report message to a second gNB that provides a service for the second cell based on the PCI; if the PCI of the second cell is not found, determining a second AMF for providing service for the second cell corresponding to the PCI from a 5G network so as to trigger the second AMF to send a first handover report message to a second gNB for providing service for the second cell;

The mobility management method is described above, and a mobility management device corresponding to the method will be described in detail below.

The invention provides a mobility management device, which is applied to a first gNB, and comprises:

In some embodiments, the NG interface binds a plurality of stream control transmission protocol SCTP links; the first management unit is specifically configured to: selecting a target link from a plurality of SCTP links bound by the NG interface; and sending the error indication message to a first AMF accessed by the first gNB through the target link.

In some embodiments, the first management unit is specifically configured to:

In some embodiments, after receiving the RRC reestablishment request sent by the first terminal device, the first receiving unit further includes:

In some embodiments, the apparatus further comprises an adjustment unit for:

The invention provides a mobility management device, which is applied to a first access mobility management function network element AMF accessed by a first gNB, and comprises:

The implementation process of the functions and roles of each module in the above device is specifically shown in the implementation process of the corresponding steps in the above method, and will not be described herein again.

For the device embodiments, reference is made to the description of the method embodiments for the relevant points, since they essentially correspond to the method embodiments. The apparatus embodiments described above are merely illustrative, wherein the modules illustrated as separate components may or may not be physically separate, and the components shown as modules may or may not be physical, i.e., may be located in one place, or may be distributed over a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purposes of the present invention. Those of ordinary skill in the art will understand and implement the present invention without undue burden.

The apparatus, module or unit set forth in the above embodiments may be implemented in particular by a computer chip or entity, or by a product having a certain function. One typical implementation is a computer. In a typical configuration, a computer includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.

The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of computer-readable media.

Correspondingly, the invention also provides equipment, which comprises a processor; a memory for storing processor-executable instructions; wherein the processor is configured to perform the method as described in any of the above.

Fig. 6 is a schematic block diagram of an apparatus provided in an exemplary embodiment. Referring to fig. 6, at the hardware level, the device includes a processor 602, an internal bus 604, a network interface 606, a memory 608, and a non-volatile storage 610, although other hardware required by other services is possible. One or more embodiments of the invention may be implemented in a software-based manner, such as by the processor 602 reading a corresponding computer program from the non-volatile memory 610 into the memory 608 and then running. Of course, in addition to software implementation, one or more embodiments of the present invention do not exclude other implementation, such as a logic device or a combination of software and hardware, etc., that is, the execution subject of the following process flows is not limited to each logic unit, but may also be hardware or a logic device.

The invention also provides a computer readable storage medium having stored thereon computer instructions which when executed by a processor perform the steps of a method as claimed in any one of the preceding claims.

Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, read only compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic disk storage, quantum memory, graphene-based storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by the computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.

The foregoing describes certain embodiments of the present invention. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims can be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.

It is to be understood that the invention is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the invention.

Claims

1. A mobility management method, wherein the method is applied to a first base station gNB, the method comprising:

based on the RRC reestablishment request, sending an error indication message to a first access mobile management function network element AMF accessed by the first gNB through an NG interface; the error indication message carries a physical cell identifier PCI corresponding to a second cell, so that a first AMF sends a first switching report message to a second gNB corresponding to the PCI and serving the second cell; the first handover report message is configured to instruct the second gNB to adjust a handover parameter between the second cell and the first cell, so that other terminal devices are successfully handed over from the second cell to the first cell based on the adjusted handover parameter.

2. The method according to claim 1, wherein the NG interface binds a plurality of stream control transmission protocol SCTP links;

the sending, by the NG interface, an error indication message to a first AMF accessed by the first gNB includes:

Selecting a target link from a plurality of SCTP links bound by the NG interface;

and sending the error indication message to a first AMF accessed by the first gNB through the target link.

3. The method of claim 1, wherein selecting a target link from a plurality of SCTP links bound by the NG interface comprises:

4. The method according to claim 1, wherein after receiving the RRC reestablishment request sent by the first terminal device, the method further comprises:

5. The method according to claim 1, wherein the method further comprises:

6. A mobility management method, characterized in that the method is applied to a first access mobility management function network element AMF accessed by a first gNB, the method comprising:

7. The method of claim 6, wherein the PCI corresponds to a plurality of cells; the error indication message also comprises a radio network temporary identifier RNTI of the first terminal equipment;

8. A mobility management device, the device being applied to a first gNB, the device comprising:

A first management unit, configured to send an error indication message to a first access mobility management function network element AMF accessed by the first gNB through an NG interface based on the RRC reestablishment request; the error indication message carries a second physical cell identifier PCI corresponding to a second cell, so that a first AMF sends a first handover report message to a second gNB corresponding to the second PCI and serving the second cell; the first handover report message is configured to instruct the second gNB to adjust a handover parameter between the second cell and the first cell, so that other terminal devices are successfully handed over from the second cell to the first cell based on the adjusted handover parameter.

9. A mobility management device, characterized in that the device is applied to a first access mobility management function network element AMF accessed by a first gNB, the device comprising:

10. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of claims 1-5 or the steps of the method according to any of claims 6-7 when the program is executed.