Mobility management method, apparatus, electronic device, and storage medium

Abstract

The application provides a mobility management method and device, electronic equipment and storage medium, and relates to the technical field of communication. The method comprises the following steps: a gateway performs a cell switching operation based on a target super link, so that a UE is switched from a macro base station to a target small base station, the target super link is a link established between the gateway and a core network element according to a first macro base station identifier corresponding to a target super cell; when a first switching notification message sent by the target small base station is received, the gateway determines a second switching notification message according to the first switching notification message, the first switching notification message carries a base station identifier corresponding to the target small base station, and the second switching notification message is used for notifying the core network element that the UE has been switched to the target small base station; and the gateway sends the second switching notification message to the core network element through the target super link, the core network element provides services for the UE through the target small base station, and the successful switching of the UE from the macro base station to the small base station under the super cell scheme is realized.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a mobility management method, device, electronic device, and storage medium. Background Art

[0002] Base stations are an integral part of mobile communication networks, responsible for signal transmission and coverage. Small base stations are smaller than traditional macrocells in terms of form, transmission power, and coverage. They are typically used to precisely supplement weak macrocell coverage areas or increase network capacity in hotspots.

[0003] Currently, when implementing the handover of user equipment (UE) from a macro base station to a small base station, the handover operation is usually performed collaboratively by the UE, the macro base station, the core network, and the target small base station. When the UE switches to the target small base station, the target small base station sends a handover notification message to the core network through the gateway based on the S1 application protocol (S1AP) link or the next generation application protocol (NGAP) link. The S1AP link or NGAP link is a link established in advance between the gateway and the core network based on the real logical macro base station identity (ID) corresponding to the target small base station, so that the core network is informed that the UE has accessed the target small base station and the handover of the UE from the macro base station to the small base station is completed.

[0004] However, if the super cell solution is used, that is, the super cell is used to perform the switching operation by broadcasting a switching request, then after the UE switches to the target small base station, the target small base station cannot send a switching notification message to the core network based on the above-mentioned S1AP link or NGAP link, resulting in a switching failure. Summary of the Invention

[0005] The present application provides a mobility management method, apparatus, electronic device, and storage medium to solve the problem that, when a super cell solution is used, that is, a super cell is used to initiate a handover request by broadcasting to perform a handover operation, after the UE switches to a target small base station, the target small base station cannot send a handover notification message to the core network based on the above-mentioned S1AP link or NGAP link, resulting in a handover failure. This solves the problem that the UE can successfully switch from a macro base station to a small base station under the super cell solution.

[0006] In a first aspect, the present application provides a mobility management method, comprising:

[0007] The gateway performs a cell switching operation based on the target super link to switch the terminal device from the macro base station to the target small base station; wherein the target super link is a link established between the gateway and the core network element according to the first macro base station identifier corresponding to the target super cell, and the target super link is used for communication between the gateway and the core network element; the target super cell is a cell composed of multiple small base stations whose virtual logical macro base station identifiers are all the first macro base station identifiers; the target small base station belongs to the target super cell; the first macro base station identifier is different from the second macro base station identifier corresponding to the target small base station, and the second macro base station identifier is the real logical macro base station identifier of the target small base station; the target small base station accesses the core network element;

[0008] Upon receiving the first handover notification message sent by the target small base station, the gateway determines the second handover notification message according to the first handover notification message; wherein the first handover notification message carries the base station identifier corresponding to the target small base station, the base station identifier corresponding to the target small base station includes the second macro base station identifier, the first handover notification message is used to notify the gateway that the terminal device has been switched to the target small base station, and the second handover notification message is used to notify the core network element that the terminal device has been switched to the target small base station;

[0009] The gateway sends the second switching notification message to the core network element through the target super link, so that the core network element provides services for the terminal device through the target small base station.

[0010] In one possible design, the base station identifier corresponding to the target small base station also includes a small base station identifier, where the small base station identifier is used to identify the target small base station under the logical macro base station indicated by the second macro base station identifier, and the gateway determines the second switching notification message according to the first switching notification message, including:

[0011] The gateway determines that the second switching notification message carries the base station identifier corresponding to the target small base station.

[0012] In one possible design, the base station identifier corresponding to the target small base station also includes a small base station identifier, where the small base station identifier is used to identify the target small base station under the logical macro base station indicated by the second macro base station identifier, and the gateway determines the second switching notification message according to the first switching notification message, including:

[0013] The gateway replaces the second macro base station identifier in the base station identifier corresponding to the target small base station with the first macro base station identifier, and determines that the second switching notification message carries the replaced base station identifier corresponding to the target small base station.

[0014] In one possible design, the method further includes:

[0015] The gateway sends location information to the lawful interception gateway LIG, where the location information carries the identifier of the terminal device and the location of the terminal device.

[0016] In one possible design, the location of the terminal device includes at least one of the following:

[0017] The evolved terrestrial radio access network cell global identifier (ECGI) of the target small base station;

[0018] The serial number SN of the target small base station;

[0019] The installation location of the target small base station;

[0020] The measurement location of the terminal device is obtained by measurement performed by the terminal device, and the measurement location of the terminal device is a location obtained according to a minimization of drive tests (MDT) result of the terminal device or a measurement report of the terminal device.

[0021] In one possible design, the identifier of the terminal device includes a terminal identifier and a network element identifier, the terminal identifier is used to identify the terminal device, and the network element identifier is used to identify the core network network element.

[0022] In one possible design, the terminal identifier includes at least one of the following:

[0023] a temporary identifier of the terminal device, wherein the temporary identifier is used to identify the terminal device in the target hyperlink;

[0024] Internet Protocol address IP of the terminal device;

[0025] The user plane full tunnel endpoint identifier F-TEID of the terminal device.

[0026] According to the method provided in the first aspect, the gateway performs a cell handover operation based on the target super link to enable the UE to switch from the macro base station to the target small base station. The target small base station sends a first handover notification message to the gateway. After receiving the first handover notification message, the gateway obtains the base station identifier corresponding to the target small base station and the information that the UE has switched to the target small base station. The gateway can forward this information to the core network element. The gateway determines a second handover notification message based on the first handover notification message, so as to inform the core network element that the UE has switched to the target small base station through the second handover notification message, and sends the base station identifier corresponding to the target small base station to the core network element. The core network element can perform location management and other services based on the base station identifier corresponding to the target small base station. The gateway sends the second handover notification message to the core network element via the super link. The gateway sends the second handover notification message using the target super link used in the process of performing the cell handover operation, ensuring that the core network element receives the second handover notification message through the same link as the link used when performing the cell handover operation, avoiding the problem of handover failure caused by link inconsistency, thereby ensuring that the UE can successfully switch from the macro base station to the small base station in the super cell solution.

[0027] In a second aspect, the present application provides a mobility management device, comprising: a module for executing the method in the above-mentioned first aspect and any possible design of the first aspect.

[0028] In a third aspect, the present application provides an electronic device comprising a memory and a first processor, wherein the memory stores a computer executable program or instructions, and when the first processor executes the computer executable program or instructions, it implements the mobility management method as in the first aspect and any possible design of the first aspect.

[0029] In a fourth aspect, the present application provides an electronic device, comprising a second processor, which implements the mobility management method in the first aspect and any possible design of the first aspect when executing a computer executable program or instruction in a memory.

[0030] In a fifth aspect, the present application provides a computer-readable storage medium, on which a computer-executable program or instruction is stored. When the computer-executable program or instruction is executed by a processor, a mobility management method as in the first aspect and any possible design of the first aspect is implemented.

[0031] In the sixth aspect, the present application provides a chip, including: an interface circuit and a logic circuit, the interface circuit is used to receive signals from other chips outside the chip and transmit them to the logic circuit, or send signals from the logic circuit to other chips outside the chip, and the logic circuit is used to implement the mobility management method in the first aspect and any possible design of the first aspect.

[0032] In the seventh aspect, the present application provides a computer program product, including: execution instructions, the execution instructions are stored in a readable storage medium, at least one processor of the electronic device can read the execution instructions from the readable storage medium, and at least one processor executes the execution instructions so that the electronic device implements the mobility management method in the first aspect and any possible design of the first aspect.

[0033] The above description is only an overview of the technical solutions of the embodiments of the present application. In order to more clearly understand the technical means of the embodiments of the present application, they can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiments of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A signaling interaction diagram of a switching method provided in one embodiment of the present application.

[0035] Figure 2 A signaling interaction diagram of a mobility management method provided in one embodiment of the present application.

[0036] Figure 3 A signaling interaction diagram of a cell switching operation method provided in one embodiment of the present application.

[0037] Figure 4 A flowchart of a method for determining a second switching notification message provided in one embodiment of the present application.

[0038] Figure 5 A flowchart of a method for determining a second switching notification message provided in one embodiment of the present application.

[0039] Figure 6 A signaling interaction diagram of a mobility management method provided in one embodiment of the present application.

[0040] Figure 7 A signaling interaction diagram of a method for determining a measurement location of a UE provided in one embodiment of the present application.

[0041] Figure 8 A schematic diagram of the structure of a mobility management device provided in one embodiment of the present application.

[0042] Figure 9 A schematic structural diagram of an electronic device provided in one embodiment of the present application.

[0043] Figure 10 A schematic structural diagram of an electronic device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0044] In this application, "at least one" means one or more, and "more" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can mean: the existence of A alone, the existence of A and B at the same time, and the existence of B alone, where A and B can be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a alone, b alone, or c alone can mean: a alone, b alone, c alone, a and b combined, a and c combined, b and c combined, or a, b, and c combined, where a, b, and c can be single or plural. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0045] The directions or positional relationships indicated by terms such as "center", "longitudinal", "lateral", "up", "down", "left", "right", "front", and "back" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present application.

[0046] The terms "connected" and "connect" should be interpreted broadly. For example, "connected" or "connected" in a circuit structure can refer not only to a physical connection, but also to an electrical connection or a signal connection. For example, it can be a direct connection, i.e., a physical connection, or an indirect connection through at least one intermediate component, as long as the circuit is interconnected. It can also refer to internal connectivity between two components. Signal connection can refer not only to signal connection through circuits but also to signal connection through media, such as radio waves. Those skilled in the art will understand the specific meanings of the above terms in this application on a case-by-case basis.

[0047] First, several terms appearing in this application are explained.

[0048] 1. Small base station.

[0049] Small base stations, also known as home eNode Bs, are primarily used in homes and businesses, enhancing wireless network capacity and coverage by being deployed in hotspots. Specifically, based on their power, small base stations can be categorized as microcells, picocells, and femtocells. Microcells are small base stations with a limited coverage range, typically used for indoor or small area coverage. Picocells have a wider coverage range than microcells and are suitable for medium-sized areas, such as small offices and shopping malls. Femtocells are primarily used in homes and small businesses, with a very small coverage range, typically within tens of meters.

[0050] 2. Global eNodeB identity (Global eNodeB ID).

[0051] The Global eNodeB ID is used to identify a base station globally.

[0052] When a base station or gateway initially establishes a communication link with a core network element, the base station or gateway sends a link establishment request to the core network element that carries the Global eNodeB ID.

[0053] For example, when the core network element is a mobility management entity (MME), an S1AP link can be established between the base station or gateway and the core network element. The S1APRequest sent by the base station or gateway to the core network element carries the Global eNodeB ID.

[0054] For another example, when the core network element is the access and mobility management function (AMF), a base station or gateway can establish an NGAP link with the core network element, and the NGAP Request sent by the base station or gateway to the core network element carries the Global eNodeB ID.

[0055] The Global eNodeB ID includes the public land mobile network (PLMN) identifier and the base station identifier. A base station can be a macro base station or a small base station. If the base station is a macro base station, the base station identifier in the Global eNodeB ID is 20 bits and is identical to the first 20 bits of the cell ID in the evolved universal mobile telecommunications system terrestrial radio access network cell global identifier (ECGI). If the base station is a small base station, the base station identifier in the Global eNodeB ID is the same as the cell ID in the ECGI, which is 28 bits.

[0056] 3. The base station identifier, real logical macro base station identifier and small base station identifier corresponding to the small base station.

[0057] When establishing a communication network, it is necessary to group multiple small base stations in the network to obtain multiple groups of small base stations, and logically combine each group of small base stations into a logical macro base station, that is, a logical macro base station includes a group of small base stations.

[0058] In addition, each small base station needs to be encoded according to the hierarchical coding rules to obtain the base station identifier corresponding to the small base station (that is, the base station identifier in point 2 when the base station is a small base station), which is used to distinguish each small base station globally.

[0059] The base station identifier corresponding to a small base station can include two parts: one part is the actual logical macro base station identifier, which is used to identify the logical macro base station corresponding to the small base station, thereby distinguishing different logical macro base stations. The other part is the small base station identifier, which is used to identify a small base station under a logical macro base station, thereby distinguishing different small base stations under the same logical macro base station. In 4G, the base station identifier corresponding to a small base station can be 28 bits. The actual logical macro base station identifier is the first 20 bits of the base station identifier corresponding to the small base station, and the small base station identifier is the last 8 bits of the base station identifier corresponding to the small base station.

[0060] Therefore, the small base stations belonging to the same logical macro base station have the same real logical macro base station identifier, but different small base station identifiers.

[0061] It should be noted that the "real" in the above real logical macro base station identifier is used to distinguish the virtual logical macro base station identifier corresponding to the super cell in the following text and has no other meaning.

[0062] 4. Target ID.

[0063] During a UE handover from a source base station to a target base station, the source base station sends a Handover Required message to the core network element, which carries a target identifier. The target identifier is used to indicate the UE's handover target.

[0064] The target identifier includes the Global eNodeB ID corresponding to the target base station and the selected tracking area identity (Selected TAI).

[0065] 5.ECGI.

[0066] During handover of a UE from a source base station to a target base station, the target base station or gateway sends a handover notification message to a core network element. The handover notification message carries an ECGI.

[0067] The ECGI includes the PLMN identifier and cell identifier. When the target base station is a small base station in 4G, the cell identifier can be 28 bits. The first 20 bits are the actual logical macro base station identifier corresponding to the small base station, which is consistent with the first 20 bits of the base station identifier in the Global eNodeB ID. The last 8 bits are the small base station identifier corresponding to the small base station, which is consistent with the last 8 bits of the base station identifier in the Global eNodeB ID. That is, when the target base station is a small base station, the cell identifier in the ECGI is consistent with the base station identifier in the Global eNodeB ID corresponding to the small base station.

[0068] 6. Super community.

[0069] In the super cell solution, multiple small base stations in the communication network are pre-divided into multiple groups according to certain rules, and the small base stations in each group correspond to different logical macro base stations.

[0070] Each of the above-mentioned groups of small base stations forms a super cell. The group of small base stations is encoded according to certain rules. For each small base station, the super cell base station identifier corresponding to the small base station is obtained. The super cell base station identifier corresponding to the small base station is an identifier that is different from the base station identifier corresponding to the above-mentioned small base station. It is only used in the super cell, but the encoding logic is similar to the base station identifier corresponding to the above-mentioned small base station.

[0071] For example, in 4G, a super cell base station identifier can be 28 bits. A super cell base station identifier consists of two parts: one is a virtual logical macro base station identifier, which is the first 20 bits of the super cell base station identifier and is used to distinguish different super cells. Each super cell has a corresponding virtual logical macro base station identifier. All small base stations within the same super cell have the same virtual logical macro base station identifier. The real logical macro base station identifier and the virtual logical macro base station identifier corresponding to a small base station should be different. The other part is a super cell small base station identifier, which is the last 8 bits of the super cell base station identifier and is used to distinguish different small base stations within the same super cell.

[0072] It should be noted that the "virtual" in the above virtual logical macro base station identifier is to distinguish the real logical macro base station identifier in the base station identifier corresponding to the small base station in the previous text, and has no other meaning.

[0073] Combined with the introduction in point 3, each small base station corresponds to a real logical macro base station identifier and a virtual logical macro base station identifier.

[0074] In the non-super cell solution, the base station identifier in the Global eNodeB ID corresponding to the small base station is the base station identifier corresponding to the small base station, and the cell identifier in the ECGI corresponding to the small base station is consistent with the base station identifier corresponding to the small base station.

[0075] In the super cell solution, the base station identifier in the Global eNodeB ID corresponding to the small base station is the super cell base station identifier corresponding to the small base station, and the cell identifier in the ECGI corresponding to the small base station is consistent with the base station identifier corresponding to the small base station.

[0076] The non-super cell solution refers to a solution that does not utilize a super cell, for example, a solution that utilizes a base station identifier corresponding to a small base station when a UE is switched from a macro base station to a small base station.

[0077] The super cell solution refers to a solution using a super cell, for example, when a UE is switched from a macro base station to a small base station, the super cell base station identifier corresponding to the small base station is used for switching.

[0078] 7. Terminal device.

[0079] In the present application, a terminal device may be a mobile terminal. A terminal device may refer to user equipment, access terminal, subscriber unit, subscriber station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, wireless communication device, user agent or user device. The terminal device may also be a satellite phone, a cellular phone, a smart phone, a wireless data card, a wireless modem, a machine type communication device, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device or a wearable device, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, a terminal device in a 5G mobile communication system, a terminal device in a 6G mobile communication system, or a terminal device in a future mobile communication system, etc.

[0080] 8. Core network element.

[0081] The core network refers to core network equipment, which can be, for example, equipment in the core network (CN) of an existing mobile communication architecture or equipment in the core network of a future mobile communication architecture. As a bearer network, the core network provides an interface to the data network, offering communication connectivity, authentication, management, policy control, and data service bearer functions for terminal devices. Core network elements may include: mobility management entity (MME), serving gateway (SGW), packet data network gateway (PGW), home subscriber server (HSS), access and mobility management function (AMF), session management function (SMF), authentication server function (AUSF), policy control function (PCF), user plane function (UPF), and other network elements.

[0082] In related technologies, the UE can Figure 1 The method shown is to switch from a macro base station to a small base station.

[0083] Figure 1 This is a signaling interaction diagram of a switching method provided in one embodiment of the present application. Figure 1 As shown, this method is a non-super cell solution, that is, a solution for switching using the base station identifier corresponding to the small base station. The method includes:

[0084] S0. The gateway establishes an S1AP link or an NGAP link with a core network element according to each of the multiple third macro base station identifiers.

[0085] Among them, the core network element is MME or AMF.

[0086] Among them, multiple third macro base station identifiers refer to the real logical macro base station identifiers corresponding to multiple small base stations in the communication network, that is, the first 20 bits of the base station identifier in the Global eNodeB ID corresponding to the small base station. Multiple third macro base station identifiers are pre-stored in the gateway.

[0087] For each third macro base station identifier, the gateway establishes an S1AP link or NGAP link corresponding to the third macro base station identifier, obtaining multiple S1AP links or multiple NGAP links. During link establishment, the gateway sends a link setting to the core network element, carrying the Global eNodeB IDs corresponding to the multiple small base stations.

[0088] S1. The UE sends a Handover Prepare message to the source macro base station, so that the source macro base station prepares for handover.

[0089] The source macro base station is the macro base station that the UE currently accesses.

[0090] S2. The source macro base station sends a handover required message to the core network element, requesting to initiate a cell handover.

[0091] The handover request message carries a target ID, which is used to indicate the handover target of the UE.

[0092] The target identifier may be the base station identifier in the Global eNodeB ID corresponding to the target small base station. The base station identifier in the Global eNodeB ID corresponding to the target small base station includes the real logical macro base station identifier of the target small base station and the small base station identifier of the target small base station.

[0093] Based on this, the core network element learns the target small base station to which the UE will switch, and can thereby notify the target small base station that the UE will switch to the target small base station.

[0094] S3. The core network element sends a handover request message to the target small base station through the gateway, thereby informing the target small base station that the UE is about to initiate a handover.

[0095] When the target identifier is the base station identifier in the Global eNodeB ID corresponding to the target small base station, the core network element queries the corresponding link from the multiple S1AP links or multiple NGAP links established in S0 based on the first 20 bits of the base station identifier in the Global eNodeB ID, and sends a switching request message to the gateway / target small base station through the corresponding link.

[0096] S4. The target small base station sends a handover request confirmation (Handover RequestAck) message to the core network element through the gateway, informing the core network element that the UE can be handed over to the target small base station.

[0097] S5. The core network element sends a handover command (Handover Command) message to the source macro base station, instructing the UE to start handover.

[0098] S6. The source macro base station sends a handover command (Handover Command) message to the UE, instructing the UE to start handover.

[0099] The source macro base station forwards the handover instruction message to the UE, so that the UE knows that it needs to start handover.

[0100] S7. The UE sends a Handover Confirm message to the target small cell to confirm whether to switch to the target small cell.

[0101] S8. The target small base station sends a handover notification (Handover Notify) message to the core network element through the gateway, informing the core network element that the UE has been handed over to the target small base station.

[0102] The switching notification message carries the ECGI corresponding to the target small base station, and the cell identifier in the ECGI corresponding to the target small base station is consistent with the base station identifier corresponding to the target small base station.

[0103] When sending a handover notification message to the core network element, the gateway selects the corresponding S1AP link or NGAP link based on the first 20 bits of the cell identifier in the ECGI corresponding to the target small base station. Since the cell identifier in the ECGI corresponding to the target small base station is consistent with the base station identifier corresponding to the target small base station, the link is consistent with the link selected by the core network element in S3. The core network element / gateway can send a handover request message / handover notification message based on the same link, so that the core network element can match the handover request message sent in S3 with the handover notification message when receiving the handover notification message, ensuring that the core network element can determine that the UE has completed the handover. If it does not match, the handover may fail.

[0104] In addition, after completing the handover from the source macro base station to the target small base station, the method further includes:

[0105] S9. The lawful interception gateway (LIG) obtains the UE's location from the core network element.

[0106] However, if the super cell solution is used, according to the above-mentioned switching process, the base station identifier in the target identifier carried in the switching request message in S2 is the super cell base station identifier corresponding to the target small base station. The cell identifier in the ECGI in the switching notification message in S8 is the base station identifier corresponding to the target small base station. The virtual logical macro base station identifier in the super cell base station identifier corresponding to the target small base station is inconsistent with the real logical macro base station identifier in the base station identifier corresponding to the target small base station. Then, after the UE switches to the target small base station, the target small base station cannot select the S1AP link or NGAP link based on the above method to send a switching notification message to the core network. In other words, when sending the switching request message and the switching notification message, they will be two different links, which will cause the UE to be unable to correctly switch from the macro base station to the small base station.

[0107] Based on this, the present application provides a mobility management method, apparatus, electronic device, and storage medium. The gateway performs a cell switching operation according to a target superlink corresponding to a target small base station. After the UE switches to the target small base station, the gateway sends a switching notification message to the core network element based on the target superlink, rather than determining the link for sending the switching notification message based on the ECGI corresponding to the target small base station, thereby ensuring that the core network element receives the switching notification message through the same link as the link used when performing the cell switching operation, thereby ensuring that in the super cell solution, the UE can successfully switch from the macro base station to the small base station.

[0108] The mobility management method provided in this application can be executed by an electronic device, such as a gateway, such as a small cell gateway. Alternatively, the mobility management method provided in this application can be executed by a mobility management device in an electronic device, which can be implemented through a combination of software and / or hardware. For simplicity of description, the embodiments of this application are described using a gateway as an example.

[0109] Below, the following embodiments of this application will be combined with Figures 2 to 7 , the mobility management method provided in this application is elaborated in detail.

[0110] See also Figure 2 , Figure 2 This is a signaling interaction diagram of a mobility management method provided in one embodiment of the present application. Figure 2 As shown, the method includes:

[0111] S101. The gateway performs a cell switching operation based on a target super link to enable the UE to switch from a macro base station to a target small base station.

[0112] Among them, the macro base station is the base station that the UE currently accesses. When the quality of the signal provided by the macro base station to the UE decreases, or when load balancing is required, or when network resource utilization needs to be optimized, the UE needs to switch from the macro base station to the target small base station to ensure that normal services can be provided to the UE.

[0113] Before the UE switches from the macro base station to the target small base station, if the super cell solution is used, the gateway and the core network element will pre-establish a super link between the gateway and the core network element. The super link is used for communication between the gateway and the core network element. The super link can be an S1AP link or an NGAP link.

[0114] The gateway pre-stores multiple virtual logical macro base station identifiers corresponding to different super cells. The gateway establishes a corresponding super link for each super cell. For a super cell, when there is a service related to the small base station belonging to the super cell, the gateway and the core network element can use the super link corresponding to the super cell to communicate.

[0115] When the UE switches from the macro base station to the target small base station, the gateway can perform a cell switching operation based on the target super link corresponding to the target small base station.

[0116] The target super link is a link established between the gateway and the core network element according to the first macro base station identifier corresponding to the target super cell, and the target super link is used for communication between the gateway and the core network element.

[0117] The target super cell is composed of multiple small base stations, each with a first macro base station identifier. The target small base station belongs to the target super cell. The first macro base station identifier is the virtual logical macro base station identifier corresponding to the target small base station. The first macro base station identifier is different from the second macro base station identifier corresponding to the target small base station. The second macro base station identifier is the actual logical macro base station identifier of the target small base station.

[0118] Among them, the target small base station accesses the core network element, which can be MME or AMF.

[0119] Next, combine Figure 3 , which details the specific process of performing cell switching operations.

[0120] See also Figure 3 , Figure 3 This is a signaling interaction diagram of a cell switching operation method provided in one embodiment of the present application. Figure 3 As shown, the method includes:

[0121] S1011. UE sends first information to the macro base station.

[0122] Correspondingly, the macro base station receives the first information sent by the UE.

[0123] The first information is used to instruct the macro base station to perform handover preparation. The first information may be carried in a Handover Prepare message.

[0124] S1012. The macro base station sends second information to the core network element.

[0125] Correspondingly, the core network element receives the second information sent by the macro base station.

[0126] The second information is used to initiate a cell handover request to a core network element. The second information may be carried in a Handover Required message.

[0127] The second information may carry a target ID. In a super cell solution, the target ID indicates the target super cell and may be the identifier of the first macro base station. Based on this, the core network element may initiate a handover request to the first candidate small base station, which includes a small base station in the target super cell.

[0128] S1013. The core network element selects a target hyperlink according to the target identifier, and sends the third information to the gateway through the target hyperlink.

[0129] Correspondingly, the gateway receives the third information sent by the core network element through the target hyperlink.

[0130] The third information is used to initiate a handover request to the first candidate small base station. The third information may be carried in a handover request message.

[0131] S1014. The gateway broadcasts fourth information to the first candidate small base station.

[0132] Correspondingly, the first candidate small base station receives the fourth information broadcast by the gateway.

[0133] The fourth information is used to initiate a handover request to the first candidate small base station. The fourth information may be carried in a handover request message.

[0134] S1015. The second candidate small base station sends fifth information to the core network element through the gateway.

[0135] Correspondingly, the core network element receives the fifth information sent by the second candidate small base station through the gateway.

[0136] The small base station that responds to the fourth information among the first candidate small base stations (the small base station that allows the UE to be switched) is the second candidate small base station.

[0137] The fifth information is used to indicate that the second candidate small base station has confirmed that the UE can be handed over to the second candidate small base station. The fifth information can be carried in a Handover Request Ack message.

[0138] S1016. The core network element sends sixth information to the macro base station.

[0139] Correspondingly, the macro base station receives the sixth information sent by the core network network element.

[0140] The sixth information is used to instruct the UE to start cell handover. The sixth information may be carried in a handover command message.

[0141] S1017. The macro base station sends seventh information to the UE.

[0142] Correspondingly, the UE receives the seventh information sent by the macro base station.

[0143] The seventh information is used to instruct the UE to start cell handover. The seventh information may be carried in a handover command message.

[0144] S1018. The UE determines a target small base station from the second candidate small base stations, starts air interface switching with the target small base station, and sends eighth information to the target small base station.

[0145] Correspondingly, the target small base station receives the eighth information sent by the UE.

[0146] The eighth information is used to confirm whether to switch to the target small base station. The eighth information can be carried in a Handover Confirm message.

[0147] As a result, the UE switches to the target small base station.

[0148] Based on this, the gateway performs a cell switching operation based on the target super link to enable the UE to switch from the macro base station to the target small base station.

[0149] S102. The target small base station sends a first switching notification message to the gateway.

[0150] Correspondingly, the gateway receives the first switching notification message sent by the target small base station.

[0151] After the UE switches to the target small base station, the target small base station sends a first switching notification message to the gateway, thereby notifying the gateway that the UE has switched to the target small base station.

[0152] The first handover notification message is used to notify the gateway terminal device that it has switched to the target small base station. The first handover notification message carries a base station identifier corresponding to the target small base station. The base station identifier corresponding to the target small base station includes a second macro base station identifier.

[0153] In some examples, the base station identifier corresponding to the target small base station may be the ECGI corresponding to the target small base station. The ECGI includes the PLMN identifier and cell identifier corresponding to the target small base station, wherein the cell identifier may include the real logical macro base station identifier corresponding to the target small base station, i.e., the second macro base station identifier, and the small base station identifier corresponding to the target small base station. For example, in 4G, the cell identifier is 28 bits, the first 20 bits are the real logical macro base station identifier corresponding to the target small base station, and the last 8 bits are the small base station identifier corresponding to the target small base station.

[0154] Based on this, the gateway receives the first switching notification message, learns the base station identifier corresponding to the target small base station, and the information that the UE has switched to the target small base station, and the gateway can forward this information to the core network element.

[0155] S103: The gateway determines a second switching notification message according to the first switching notification message.

[0156] Among them, the second switching notification message is used to notify the core network element terminal device that it has switched to the target small base station.

[0157] The gateway may determine the second switching notification message in various ways.

[0158] In some examples, the gateway can directly determine the first switching notification message as the second switching notification message, and the second switching notification message also carries the base station identifier corresponding to the target small base station, that is, the gateway can directly forward the first switching notification message to the core network network element, so as to inform the core network network element through the second switching notification message that the UE has switched to the target small base station, and send the base station identifier corresponding to the target small base station to the core network network element. The core network network element can perform location management and other services based on the base station identifier corresponding to the target small base station.

[0159] In other examples, the gateway can replace the second macro base station identifier in the base station identifier corresponding to the target small base station carried in the first handover notification message with the first macro base station identifier, that is, replace the real logical macro base station identifier with the virtual logical macro base station identifier, and obtain the second handover notification message. Based on this, after receiving the second handover notification message, the core network element can match the first macro base station identifier in the second handover notification message with the first macro base station identifier in the target identifier received by the core network element during the above-mentioned cell handover operation, ensuring that the second handover notification message is consistent with the identifier in the handover requirement (Handover Required) message, avoiding the core network element releasing the UE due to the inability to match the two, and ensuring that the UE can successfully switch to the target small base station.

[0160] S104. The gateway sends a second switching notification message to the core network element through the target hyperlink.

[0161] Correspondingly, the core network element receives the second switching notification message sent by the gateway through the target hyperlink.

[0162] The gateway sends a second switching notification message by using the target super link used in the process of performing the cell switching operation, ensuring that the core network network element receives the second switching notification message through the same link as the link used when performing the cell switching operation, avoiding the problem of switching failure caused by link inconsistency, thereby ensuring that the UE successfully switches to the target small base station.

[0163] Thus, the core network element can correctly receive the second switching notification message, and learn that the UE has switched to the target small base station, and learn the base station identifier corresponding to the target small base station. The core network element can identify the corresponding target small base station based on the base station identifier corresponding to the target small base station, and identify which small base station the UE is accessing. Furthermore, the core network element can correctly identify and process the signaling and data from the target small base station to ensure that the UE correctly accesses the target small base station. Furthermore, the core network element or other gateways such as LIG can perform location management and other services based on the base station identifier corresponding to the target small base station.

[0164] In an embodiment of the present application, the gateway performs a cell switching operation based on the target super link to enable the UE to switch from the macro base station to the target small base station. The target small base station sends a first switching notification message to the gateway. After receiving the first switching notification message, the gateway learns the base station identifier corresponding to the target small base station and the information that the UE has switched to the target small base station. The gateway can forward this information to the core network element. The gateway determines the second switching notification message based on the first switching notification message, so as to inform the core network element through the second switching notification message that the UE has switched to the target small base station, and sends the base station identifier corresponding to the target small base station to the core network element. The core network element can perform location management and other services based on the base station identifier corresponding to the target small base station. The gateway sends the second switching notification message to the core network element through the super link. The gateway sends the second switching notification message using the target super link used in the process of performing the cell switching operation, ensuring that the core network element receives the second switching notification message through the same link as the link used when performing the cell switching operation, avoiding the problem of switching failure caused by link inconsistency, thereby ensuring that the UE can successfully switch from the macro base station to the small base station in the super cell solution.

[0165] Based on the above exemplary description, the gateway can determine the second switching notification message according to the first switching notification message in a variety of ways. Figure 4 and Figure 5 , introduces a method for determining the second switching notification message.

[0166] See also Figure 4 , Figure 4 A flow chart of a method for determining a second switching notification message provided in an embodiment of the present application. Figure 4 As shown, the method includes:

[0167] S201. The gateway determines that the second handover notification message carries a base station identifier corresponding to the target small base station.

[0168] That is to say, the gateway can directly determine the first switching notification message as the second switching notification message, and the second switching notification message also carries the base station identifier corresponding to the target small base station, that is, the gateway can directly forward the first switching notification message to the core network element.

[0169] The base station identifier corresponding to the target small base station may be the cell identifier in the ECGI corresponding to the target small base station.

[0170] Based on this, the core network network element can receive the base station identifier corresponding to the target small base station, and obtain the second macro base station identifier through the base station identifier corresponding to the target small base station, that is, obtain the real logical macro base station identifier of the target small base station, so that the core network network element or LIG can know the target small base station providing services for the UE, thereby providing location management and other services for the UE.

[0171] See also Figure 5 , Figure 5 A flow chart of a method for determining a second switching notification message provided in an embodiment of the present application. Figure 5 As shown, the method includes:

[0172] S301. The gateway replaces the second macro base station identifier in the base station identifier corresponding to the target small base station with the first macro base station identifier, and determines that the second switching notification message carries the base station identifier corresponding to the replaced target small base station.

[0173] The gateway can replace the second macro base station identifier in the base station identifier corresponding to the target small base station carried in the first switching notification message with the first macro base station identifier, that is, replace the real logical macro base station identifier with the virtual logical macro base station identifier, thereby obtaining the base station identifier corresponding to the replaced target small base station, and determine that the second switching notification message carries the base station identifier corresponding to the replaced target small base station.

[0174] Based on this, after receiving the second handover notification message, the core network network element can match the first macro base station identifier in the second handover notification message with the first macro base station identifier in the target identifier received by the core network network element during the above-mentioned cell handover operation, ensuring that the second handover notification message is consistent with the identifier in the handover requirement (Handover Required) message, avoiding the core network network element releasing the UE due to the inability to match the two, ensuring that the UE can successfully switch to the target small base station, and improving the handover success rate.

[0175] Based on the above exemplary description, Figure 2 Based on the embodiment, after the core network element learns that the UE has switched to the target small base station, the gateway may also send location information to the lawful interception gateway LIG.

[0176] See also Figure 6 , Figure 6 This is a signaling interaction diagram of a mobility management method provided in one embodiment of the present application. Figure 6 As shown, the method further includes:

[0177] S105. The gateway sends location information to the LIG.

[0178] Correspondingly, LIG ​​receives the location information sent by the gateway.

[0179] Based on this, LIG ​​can successfully obtain the information of the target small base station accessed by the UE and the location information of the UE through location information, thereby providing location management services.

[0180] The location information carries the UE identifier and the UE location.

[0181] The UE identifier includes a terminal identifier and a network element identifier.

[0182] The terminal identifier is used to identify the UE. After receiving the terminal identifier, the LIG can distinguish different UEs based on the terminal identifier.

[0183] The network element identifier is used to identify the core network element. After receiving the network element identifier, the LIG can distinguish the core network element that provides services to the UE based on the network element identifier.

[0184] For example, when the core network element is an MME, the network element identifier may be (global unique MME identifier, GUMMEI).

[0185] GUMMEI is a unique identifier used to identify MME, so that LIG can know which MME in the core network the target small base station accesses through GUMMEI.

[0186] The terminal identifier may include at least one of the following:

[0187] ①. Temporary identifier of UE.

[0188] The temporary identifier is used to identify the UE in the target hyperlink.

[0189] For example, when the target hyperlink is an S1AP link, the temporary identifier may be the MME UE S1AP ID.

[0190] The MME UE S1AP ID can uniquely identify the UE in the S1AP link. After receiving the terminal identifier, the LIG can identify the UE in the S1AP link through the MME UE S1AP ID.

[0191] ②. UE's internet protocol address (IP).

[0192] Among them, the IP of the UE can uniquely identify the location of the UE in the wireless network. After receiving the terminal identifier, the LIG can identify the UE through the IP of the UE.

[0193] ③、Full qualified tunnel endpoint identifier (F-TEID) of the UE's user plane

[0194] Among them, F-TEID is used to uniquely identify the endpoint of a tunnel, which corresponds to a UE or a UE session, so that LIG can distinguish UEs by their F-TEID.

[0195] The UE location may include multiple situations, and the UE location includes at least one of the following:

[0196] The UE location includes at least one of the following:

[0197] ①. ECGI corresponding to the target small base station.

[0198] Among them, the ECGI corresponding to the target small base station can uniquely identify the target small base station in the PLMN. Based on this, the LIG can obtain the location of the target small base station through the ECGI corresponding to the target small base station. Furthermore, since the UE has switched to the target small base station, that is, the UE is within the coverage range of the target small base station signal, the location of the target small base station can also represent the location of the UE, that is, the LIG can obtain the location of the UE through the ECGI corresponding to the target small base station.

[0199] ②. Serial number (SN) of the target small base station.

[0200] The serial number of the target small base station is the unique identification code of the target small base station, which is used to identify the identity of the target small base station. Through the serial number of the target small base station, LIG ​​can track and manage the target small base station. Since the UE has been switched to the target small base station, LIG ​​can know the location of the UE through the serial number of the target small base station.

[0201] ③. Installation location of the target small base station.

[0202] The installation location of the target small cell can be an installation address of the target small cell, such as a geographic location, or can be coordinates in a global navigation satellite system (GNSS). Since the UE has already been handed over to the target small cell, the LIG can obtain the UE's location based on the installation location of the target small cell.

[0203] ④. Measurement location of UE.

[0204] The UE's measurement location is obtained by the UE through measurement. The UE's measurement location may be a location obtained based on the UE's minimization of drive-test (MDT) results or the UE's measurement report (MR). The UE's measurement location can indicate the UE's precise location, thereby improving the accuracy of LIG location management.

[0205] Next, combine Figure 7 , introduces a method for determining the measurement location of a UE.

[0206] See also Figure 7 , Figure 7 This is a signaling interaction diagram of a method for determining a measurement location of a UE provided in one embodiment of the present application. Figure 7 As shown, the method includes:

[0207] S401: The target small base station sends a measurement instruction to the UE.

[0208] Correspondingly, the UE receives the measurement instruction sent by the target small base station.

[0209] The measurement instruction is used to instruct the UE to perform measurement.

[0210] S402: The UE performs measurement to obtain a measurement result, and sends the measurement result to the target small base station.

[0211] Correspondingly, the target small base station receives the measurement result sent by the UE.

[0212] The measurement result may include an MDT result or an MR.

[0213] S403: The target small base station obtains the measurement location of the UE based on the measurement result, and sends the measurement location of the UE to the gateway.

[0214] Correspondingly, the gateway receives the measurement location of the UE sent by the target small base station.

[0215] Based on this, the gateway can determine the measurement location of the UE.

[0216] The following describes a mobility management device provided in an embodiment of the present application.

[0217] Figure 8 This is a schematic diagram of the structure of a mobility management device provided in one embodiment of the present application. Figure 8 As shown, the device includes: a switching module 101, a determining module 102 and a sending module 103.

[0218] A switching module 101 is configured to perform a cell switching operation based on a target superlink, so that a terminal device switches from a macro base station to a target small base station; wherein the target superlink is a link established between the gateway and the core network element based on a first macro base station identifier corresponding to the target super cell, and the target superlink is used for communication between the gateway and the core network element; the target super cell is a cell composed of multiple small base stations whose virtual logical macro base station identifiers are all the first macro base station identifiers; the target small base station belongs to the target super cell; the first macro base station identifier is different from the second macro base station identifier corresponding to the target small base station, and the second macro base station identifier is the real logical macro base station identifier of the target small base station; the target small base station accesses the core network element;

[0219] The determination module 102 is configured to determine a second handover notification message based on the first handover notification message upon receiving the first handover notification message sent by the target small base station; wherein the first handover notification message carries a base station identifier corresponding to the target small base station, and the base station identifier corresponding to the target small base station includes a second macro base station identifier. The first handover notification message is used to notify the gateway terminal device that the handover has been made to the target small base station, and the second handover notification message is used to notify the core network element terminal device that the handover has been made to the target small base station;

[0220] The sending module 103 is configured to send a second switching notification message to a core network element through a target super link, so that the core network element provides services to the terminal device through the target small base station.

[0221] It should be noted that the mobility management device of the embodiment of the present application can be used to execute the technical solution of the above-mentioned method embodiment. Its implementation principle and technical effects are similar and will not be repeated here.

[0222] In some examples, the base station identifier corresponding to the target small base station also includes a small base station identifier, and the small base station identifier is used to identify the target small base station under the logical macro base station indicated by the second macro base station identifier. The determination module 102 is specifically configured to:

[0223] It is determined that the second switching notification message carries the base station identifier corresponding to the target small base station.

[0224] In some examples, the base station identifier corresponding to the target small base station also includes a small base station identifier, and the small base station identifier is used to identify the target small base station under the logical macro base station indicated by the second macro base station identifier. The determination module 102 is specifically configured to:

[0225] The second macro base station identifier in the base station identifier corresponding to the target small base station is replaced with the first macro base station identifier, and the second switching notification message is determined to carry the base station identifier corresponding to the replaced target small base station.

[0226] In some examples, the sending module 103 is further configured to:

[0227] The location information is sent to the lawful interception gateway LIG, where the location information carries the identifier and location of the terminal device.

[0228] In some examples, the location of the terminal device includes at least one of the following:

[0229] Evolved Terrestrial Radio Access Network Cell Global Identifier (ECGI) of the target small base station;

[0230] SN of the target small cell;

[0231] The installation location of the target small base station;

[0232] The measurement location of the terminal device is obtained by measurement by the terminal device, and the measurement location of the terminal device is a location obtained based on the Minimization of Drive Test (MDT) result of the terminal device or the measurement report of the terminal device.

[0233] In some examples, the identifier of the terminal device includes a terminal identifier and a network element identifier, where the terminal identifier is used to identify the terminal device and the network element identifier is used to identify a core network element.

[0234] In some examples, the terminal identification includes at least one of the following:

[0235] A temporary identifier of the terminal device, where the temporary identifier is used to identify the terminal device in the target hyperlink;

[0236] Internet Protocol address (IP) of the terminal device;

[0237] User plane full tunnel endpoint identifier F-TEID of the terminal device.

[0238] Illustratively, the present application also provides an electronic device. Figure 9 This is a schematic diagram of the structure of an electronic device provided in one embodiment of the present application. Figure 9 As shown, the electronic device may include: a first processor 201 and a memory 202, wherein the memory 202 stores a computer program, and when the first processor 201 executes the computer program, the embodiment of the present application is implemented. Figures 2 to 7 The mobility management method shown.

[0239] Illustratively, the present application also provides an electronic device. Figure 10 This is a schematic diagram of the structure of an electronic device provided in one embodiment of the present application. Figure 10 As shown, the electronic device may include: a second processor 301, when the second processor 301 executes the computer executable program or instruction in the memory, the embodiment of the present application is implemented Figures 2 to 7 The mobility management method shown.

[0240] Exemplarily, the present application further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the embodiments of the present application can be implemented. Figures 2 to 7 The mobility management method shown.

[0241] Illustratively, the present application further provides a computer program product, comprising execution instructions stored in a computer-readable storage medium. At least one processor of an electronic device can read the execution instructions from the computer-readable storage medium, and at least one processor executes the execution instructions so that the electronic device implements the mobility management method in the above method embodiment.

[0242] Exemplarily, the present application also provides a chip, which includes an interface circuit and a logic circuit. The interface circuit is used to receive signals from other chips outside the chip and transmit them to the logic circuit, or to send signals from the logic circuit to other chips outside the chip. The logic circuit is used to implement the mobility management method in the above method embodiment.

[0243] The processor mentioned in any of the above may be a general-purpose central processing unit, a microprocessor, a baseband processor, an application-specific integrated circuit (ASIC), or one or more integrated circuits used to control the execution of the program of the method of the above embodiments. The memory mentioned in any of the above may be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (RAM), etc.

[0244] Those skilled in the art will clearly understand that, for the sake of convenience and brevity of description, the explanation and beneficial effects of the relevant contents in any of the communication devices provided above may refer to the corresponding method embodiments provided above, and will not be repeated here.

[0245] In this application, an electronic device may include a hardware layer, an operating system layer running on top of the hardware layer, and an application layer running on top of the operating system layer. The hardware layer may include hardware such as a central processing unit (CPU), a memory management unit (MMU), and memory (also known as main memory). The operating system in the operating system layer may be any one or more computer operating systems that implement business processing through processes, such as the Linux operating system, Unix operating system, Android operating system, iOS operating system, or Windows operating system. The application layer may include applications such as browsers, address books, word processing software, and instant messaging software.

[0246] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interface, device or unit, which can be electrical, mechanical or other forms.

[0247] Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0248] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0249] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the part that essentially contributes to the technical solution of this application or all or part of the technical solution can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes a number of instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the process of each embodiment of the method of this application. The aforementioned storage medium includes: USB flash drives, mobile hard drives, read-only memories, random access memories, magnetic disks, optical disks, and other media that can store program code.

[0250] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A mobility management method, characterized in that: The method comprises: The gateway performs a cell switching operation based on the target super link to switch the terminal device from the macro base station to the target small base station; wherein the target super link is a link established between the gateway and the core network element according to the first macro base station identifier corresponding to the target super cell, and the target super link is used for communication between the gateway and the core network element; the target super cell is a cell composed of multiple small base stations whose virtual logical macro base station identifiers are all the first macro base station identifiers; the target small base station belongs to the target super cell; the first macro base station identifier is different from the second macro base station identifier corresponding to the target small base station, and the second macro base station identifier is the real logical macro base station identifier of the target small base station; the target small base station accesses the core network element; Upon receiving the first handover notification message sent by the target small base station, the gateway determines the second handover notification message according to the first handover notification message; wherein the first handover notification message carries the base station identifier corresponding to the target small base station, the base station identifier corresponding to the target small base station includes the second macro base station identifier, the first handover notification message is used to notify the gateway that the terminal device has been switched to the target small base station, and the second handover notification message is used to notify the core network element that the terminal device has been switched to the target small base station; The gateway sends the second handover notification message to the core network element through the target super link, so that the core network element provides services for the terminal device through the target small base station; The base station identifier corresponding to the target small base station also includes a small base station identifier, and the small base station identifier is used to identify the target small base station under the logical macro base station indicated by the second macro base station identifier, and the gateway determines the second switching notification message according to the first switching notification message, including: The gateway replaces the second macro base station identifier in the base station identifier corresponding to the target small base station with the first macro base station identifier, and determines that the second switching notification message carries the replaced base station identifier corresponding to the target small base station.

2. The method according to claim 1, characterized in that The method further comprises: The gateway sends location information to the lawful interception gateway LIG, where the location information carries the identifier of the terminal device and the location of the terminal device.

3. The method according to claim 2, characterized in that The location of the terminal device includes at least one of the following: The evolved terrestrial radio access network cell global identifier (ECGI) of the target small base station; The serial number SN of the target small base station; The installation location of the target small base station; The measurement location of the terminal device is obtained by measurement performed by the terminal device, and the measurement location of the terminal device is a location obtained according to a minimization of drive tests (MDT) result of the terminal device or a measurement report of the terminal device.

4. The method according to claim 2, characterized in that The identifier of the terminal device includes a terminal identifier and a network element identifier, the terminal identifier is used to identify the terminal device, and the network element identifier is used to identify the core network network element.

5. The method according to claim 4, characterized in that The terminal identification includes at least one of the following: a temporary identifier of the terminal device, wherein the temporary identifier is used to identify the terminal device in the target hyperlink; Internet Protocol address IP of the terminal device; The user plane full tunnel endpoint identifier F-TEID of the terminal device.

6. A mobility management device, characterized in that: The apparatus includes: a module for executing the mobility management method according to any one of claims 1-5.

7. An electronic device, characterized in that: include: A memory and a first processor, wherein the memory stores a computer program, and when the first processor executes the computer program, the mobility management method according to any one of claims 1 to 5 is implemented.

8. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the mobility management method according to any one of claims 1 to 5 is implemented.

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