CN101287294B - Transfer method and system for mobility management entity and terminal - Google Patents

Abstract

The invention discloses a terminal transfer method. The method of the invention comprises the steps that: a mobile management entity monitors the time of a terminal staying in a home base station which belongs to a current internal subscriber group; when the time of the terminal staying in the home base station exceeds the preset time threshold, if the terminal and the home base station are in a connection state, the mobile management entity sends a request of switching to the home base station which is connected with the terminal to request the terminal to be switched to a target base station and carries the identifier of the terminal in the request of switching. The invention also discloses a mobile transfer system and the mobile management entity. By adopting the invention, the terminal in the current CSG is transferred to a base station which does not belong to the current CSG, thus resulting in that the normal operation of subscriber services can be guaranteed; the perception and the experience of subscribers can be improved for benefiting operators to maintain customers.

Description

Mobility management entity, terminal transfer method and system

technical field

The invention relates to the communication field, in particular to a mobile management entity and a terminal transfer method and system.

Background technique

In order to maintain the competitiveness of the third-generation mobile communication system in the communication field, and to provide users with faster speed, lower delay and more personalized mobile communication services at a lower operating cost, the third-generation partner The 3rd Generation Partnership Project (abbreviated as 3GPP) standard working group is working on the research of the evolved system (Evolved Packet System, abbreviated as EPS).

Figure 1 is a structural diagram of the EPS system. The EPS system is divided into two parts: Evolved Universal Terrestrial Radio Access Network (Evolved Universal Terrestrial Radio Access Network, referred to as E-UTRAN) and evolved network (Evolved Packet Core, referred to as EPC). It is called System Architecture Evolution (SAE for short). As shown in Figure 1, the EPS system includes the following network elements:

Among them, the EPC includes the following network elements:

Home Subscriber Server (HSS for short): Located in the home network of the user's subscription, it is a permanent storage point for saving the user's subscription data information;

Mobility Management Entity (MME for short): It is used to save the subscription data of the user in the current network, and is responsible for the signaling management of the terminal to the non-access stratum (Non-Access Stratum, NAS for short) of the network, and user idle time. Tracking, paging, and bearer management in this mode; among them, NAS signaling is located on the wireless network and is a high-level signaling between the terminal and the MME. It mainly deals with the mobility management and session management of the terminal. NAS signaling can only be transmitted when there is a NAS signaling connection between them;

Serving Gateway (S-GW for short): It is the gateway from the core network to the wireless system, responsible for the user plane bearer from the terminal to the core network, data caching in the terminal idle mode, service requests initiated by the network side, legal eavesdropping, grouping data routing and forwarding;

Packet data network gateway (PDN Gateway, referred to as P-GW): It is the gateway between the EPS system and the external network of the system, responsible for IP address allocation, billing, packet filtering, policy application, etc. of the terminal;

E-UTRAN includes a base station (E-UTRAN NodeB, referred to as eNB), and E-UTRAN communicates with the terminal through the air interface and is responsible for the transmission and reception of wireless signals;

The bearer is the data channel in the EPS system, used to transmit the data of the terminal and the packet data network.

The state of the terminal in the EPS system is divided into two types: EPS mobility management state and EPS connection management state. Among them, the EPS mobility management status is used to monitor information related to mobility management of the terminal on the network side. The status is divided into "registered" and "non-registered". The network side has the context information and location information of the terminal; the "non-registered" state indicates that the terminal is not registered in the EPS, and the network side has no context information and location information of the terminal. The EPS connection management state is used to monitor the signaling connection between the terminal and the MME. The state is divided into "idle" and "connected". The "idle" state indicates that there is no NAS signaling connection between the terminal and the MME, and NAS cannot be transmitted. Signaling, the terminal has no business in the network at this time; the "connected" state indicates that there is a NAS signaling connection between the terminal and the MME, and NAS signaling can be transmitted.

A cell is a small coverage area in a mobile communication network. Generally, a cell is the coverage of a base station. Due to wireless characteristics, each cell cannot cover a large area. In order to improve routing performance, multiple Two adjacent cells are combined to form a large Tracking Area (TA for short). The tracking area information of the cell is brought to the terminal through the cell broadcast sent by the base station (eNB) to the terminal. The area covered by it sends broadcast system information, the broadcast system information includes the TA code to which it belongs, and the internal user group identifier, and the user terminal in the cell can access the evolved network. Emergency call is a special service provided by the operator. When a terminal initiates an emergency call, even if the terminal is currently prohibited from accessing the cell, the terminal must be able to access the cell and make an emergency call.

Home base station (Home eNB, referred to as HNB) is a kind of eNB, which is an exclusive resource for private users. It is deployed in private places such as families, groups, companies or schools. Home base stations are owned by a few people. Features, some home base station owners form a basic subscriber group, which is called an internal subscriber group (Closed Subscriber Group, referred to as CSG). The scope of CSG can be a cell under one home base station, or it can be under multiple home base stations. For all cells, the area to which the CSG belongs only includes the cell of the home base station of the owner of the CSG user group.

For each CSG, there is a unique mark in the Public Land Mobile Network (PLMN) to identify it. The mark is CSG Identity (CSG ID), which is owned by the CSG user group The CSG identifiers of all the cells in the cell are the same.

Moreover, the area under the jurisdiction of CSG only allows authorized users to access. There are two types of such users: basic members of CSG users (that is, owners of home base stations) and temporary members (that is, guests). CSG only governs the basic members home base station.

A CSG user may register to multiple CSG user groups, so the CSG user needs to know the network to which it is currently registered, and which base stations the CSG belongs to have authorized the CSG user to access. In this way, the EPC assigns an internal user to the CSG user's terminal The group list (allowed CSG list, referred to as the CSG list for short), in which the CSG identifier represented by the CSG belongs to the area that allows the terminal of the CSG user to access. If a terminal does not have a certain CSG ID in its CSG list, it cannot access all the home base stations of the CSG. In this way, it is possible to effectively control non-CSG users' access to the CSG user group's exclusive resource - the home base station, to ensure the security of the CSG user group's resources, and to prevent the exclusive resources from being used by non-CSG users.

The owner of a femtocell (or CSG manager) may assign a guest (Guest) authority to one of his CSG users. For these users, the CSG owner or operator configures a timer as needed , named CSG Timer. If the CSG manager assigns a timer to the terminal and sets the duration of the timer (the duration may be several hours or several days) to monitor the time the terminal stays in the CSG, then when the terminal enters the CSG , the timer starts counting. If the terminal leaves the current CSG before the timer expires, the timer resets to zero; if the terminal stays longer than the timer, the timer expires and the terminal cannot continue Access to all cells in the current CSG. The purpose of this timer is to prevent CSG guest users from occupying CSG resources for a long time, so that the CSG owner can limit the time for CSG guest users to use the HNB.

A terminal in a CSG cell can be in an idle state or a connected state. In the idle state, the terminal has no service in the network. In the connected state, the terminal has service in the network. For a connected terminal that has ongoing services, if the timer expires, the evolution system will directly cut off the terminal's connection to the network, which will greatly reduce the user's perception and experience, which is not conducive to the operator's customer maintenance .

Contents of the invention

Considering the problem in the related art that the evolved system directly cuts off the network connection of the terminals in the connected state in the internal user group when the timer expires, the present invention is proposed. Therefore, the main purpose of the present invention is to provide a A mobile management entity, terminal transfer method and system are provided to solve the above problems.

According to one aspect of the present invention, a terminal transfer method is provided.

The terminal transfer method according to the embodiment of the present invention includes: the mobility management entity monitors the time that the terminal stays in the home base station belonging to the current internal user group; when the time that the terminal stays in the home base station exceeds a predetermined time threshold, if When the terminal is connected to the home base station, the mobility management entity sends a handover request to the home base station connected to the terminal, requesting that the terminal be handed over to the target base station, and the handover request carries the identifier of the terminal.

Further, the method further includes: setting a predetermined time threshold in advance.

Preferably, the mobility management entity sending the handover request to the home base station connected to the terminal further includes: the mobility management entity carries a handover cause identifier in the handover request, and the handover cause identifier is used to indicate that the terminal is not allowed to transfer to the home base station belonging to the current internal user group .

Further, the method further includes: deleting the identifier of the current internal user group in the internal user group list of the terminal.

Wherein, the operation of deleting the identifier of the current internal user group in the internal user group list of the terminal is one of the following: the mobility management entity sends non-access stratum signaling to the terminal, and deletes the current internal user group in the internal user group list of the terminal the identifier of the terminal; the home base station connected to the terminal sends wireless air interface information to the terminal, and deletes the identifier of the current internal user group in the internal user group list of the terminal.

Preferably, the above method further includes: the home base station receives the handover request, and handovers the terminal to the target base station according to the identifier of the terminal.

Wherein, the target base station is a home base station not belonging to the current internal user group or a base station not belonging to the handover restriction list of the terminal.

Preferably, the handover request includes one of the following: a handover trigger message, a system architecture evolution bearer release command (SAE bearer release command), a system architecture evolution bearer modification request (SAE bearer modification request), and a context release command of the terminal.

Wherein, when the time that the terminal resides in the home base station exceeds a predetermined time threshold, if the terminal is in an idle state, the above method further includes: deleting the current internal user group identifier in the internal user group list of the terminal.

According to another aspect of the present invention, a terminal transfer system is provided.

The terminal transfer system according to the embodiment of the present invention includes: a state monitoring module, used to monitor the state of the terminal; a handover request module, used when the terminal stays in the home base station belonging to the current internal user group for more than a predetermined time When the threshold is reached, if the terminal is connected to the home base station, a handover request is sent to the home base station connected to the terminal, and the terminal identifier is carried in the handover request. Wherein, the handover request module is used for requesting handover of the terminal to a home base station not belonging to the current internal user group; or requesting handover of the terminal to a base station in the handover restriction list not belonging to the terminal.

Further, the system further includes: a handover module, located in the home base station, configured to receive a handover request, and handover the terminal to the target base station according to the terminal identifier.

According to another aspect of the present invention, a mobility management entity is provided.

According to the mobility management entity of the embodiment of the present invention, the mobility management entity is used to monitor the time that the terminal stays in the home base station belonging to the current internal user group; when the time that the terminal stays in the home base station exceeds a predetermined time threshold, If the terminal is in a connected state with the home base station, a handover request is sent to the home base station to which the terminal is connected, and the identification of the terminal is carried in the handover request, and the terminal is requested to be handed over to a home base station not belonging to the current internal user group; or the terminal is switched to a base station not in the handover restriction list belonging to the terminal.

Through at least one of the above technical solutions of the present invention, terminals in the current CSG can be migrated to base stations not belonging to the current CSG, ensuring normal operation of user services and improving user perception and experience.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the description, and are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention. In the attached picture:

FIG. 1 is a structural diagram of an evolution system according to related technologies;

Fig. 2 is the flow chart of the terminal transfer method according to the method embodiment of the present invention;

Fig. 3 is a detailed processing flowchart of a terminal transfer method according to a method embodiment of the present invention;

Fig. 4 is a flow chart of a handover trigger flow terminal transfer method according to a method embodiment of the present invention;

Fig. 5 is a flow chart of the SAE bearer release process terminal transfer method according to the method embodiment of the present invention;

6 is a flow chart of a SAE bearer modification procedure terminal transfer method according to a method embodiment of the present invention;

7 is a flow chart of a terminal context release procedure and a terminal transfer method according to a method embodiment of the present invention;

8 is a flow chart of a method for transferring an idle state terminal according to a method embodiment of the present invention;

Fig. 9 is a structural block diagram of a terminal transfer system according to a system embodiment of the present invention.

Detailed ways

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

The internal subscriber group (CSG) cell is the cell of the home base station. Because of its small coverage, it is also called a micro cell (also called a pico cell). It corresponds to a macro cell, that is, a cell covered by a macro base station, CSG Cells generally provide hotspot coverage within the geographical range of macro cells to absorb traffic and provide users with exclusive services. When network conditions permit, migrating terminals in the current CSG to base stations not belonging to the current CSG is a better solution for both users and operators. Based on this, the basic idea of the present invention is: when the timer expires, the evolved system notifies the home base station connected to the terminal to switch the terminal to another base station, and sends the switching reason to the home base station, so that the home base station can be avoided Handover the terminal to the base station belonging to the current CSG; at the same time, for the terminal in the idle state, it is also necessary to notify the terminal to select a base station not belonging to the current CSG when the CSG timer expires.

method embodiment

According to an embodiment of the present invention, a terminal transfer method is provided. Fig. 2 is the flow chart of the terminal transfer method according to the embodiment of the present invention, as shown in Fig. 2, this method comprises the following steps:

Step S202, the MME monitors the residence time of the terminal in the home base station belonging to the current CSG;

Step S204, when the time that the terminal resides in the home base station exceeds the predetermined time threshold (at this time, the predetermined time threshold needs to be set in advance), if the terminal is connected to the home base station, the MME sends a handover request to the home base station to which the terminal is connected , to request handover of the terminal to the target base station, and carry the identity of the terminal in the handover request.

Next, the home base station can handover the terminal to the target base station according to the identifier of the terminal upon receiving the handover request.

Through the technical solutions provided by the embodiments of the present invention, the terminals in the current CSG are migrated to the base stations not belonging to the current CSG, which ensures normal operation of user services and improves user perception and experience.

The target base station mentioned here is a home base station that does not belong to the current CSG; or a base station that does not belong to the handover restriction list of the terminal, where the handover restriction list of the terminal is used to limit the cells or base stations that the terminal can handover to, and the terminal cannot handover Go to the cell or base station in the handover restriction list. For example, the MME may carry a handover cause identifier in the handover request, and the handover cause identifier is used to indicate that the terminal is not allowed to transfer to the HNB belonging to the current CSG.

Furthermore, after the handover is successful, the identifier of the current CSG in the CSG list of the terminal can be further deleted, which can be achieved in the following manner: the MME sends non-access stratum signaling to the terminal, and deletes the identifier of the current CSG in the CSG list of the terminal. or, the home base station connected to the terminal sends wireless air interface information to the terminal, and deletes the current CSG identifier in the CSG list of the terminal.

In addition, in step S204, when the terminal stays in the home base station for more than a predetermined time threshold, if the terminal is idle, the current internal user group identifier in the internal user group list of the terminal may also be deleted.

Preferably, a timer can be set in the MME to monitor the time that the terminal resides in the home base station belonging to the current CSG. In the connected state, the MME sends a handover request to the home base station to which the terminal is connected, requesting that the terminal be handed over to the target base station, and carries the identity of the terminal in the handover request; when the timer expires or the remaining predetermined duration, if the terminal is in an idle state, Delete the current CSG identifier in the terminal's CSG list.

Fig. 3 is a detailed processing flowchart of a method for terminal transfer according to a method embodiment of the present invention. As shown in Fig. 3, the method includes the following steps:

Step S301, set a CSG timer in the MME, and set the duration of the timer; the MME monitors in real time the location information of a certain terminal under the home base station belonging to the current CSG, and records the time when the terminal is under a certain CSG. When the terminal enters the current CSG, the MME starts the timer, and when the terminal leaves the current CSG, the MME closes the timer (that is, resets the timer to zero);

Step S302, when the terminal's CSG timer expires, if the terminal is still under the CSG, the MME prepares to move the terminal out and prevent it from continuing to access the current CSG;

Step S303, before migrating the terminal out of the home base station, the MME will check the connection status of the terminal to check whether the terminal has ongoing services. If the terminal is in the connected state, it means that the terminal has ongoing services. If it is allowed, switch it to another base station, and execute step S306; if the terminal is in an idle state, it means that the terminal has no business, and can directly migrate, and execute step S304;

Step S304, delete the current CSG identifier in the terminal's CSG list, so that the terminal cannot continue to access the current CSG, and only when the network re-adds the current CSG to the terminal's CSG list, the terminal can access the current CSG cell; where the current CSG identity of the terminal can be deleted in the following two ways:

The first method: MME sends NAS signaling to the terminal, and deletes the current CSG identifier in the CSG list of the terminal;

The second method: the home base station to which the terminal currently belongs sends wireless air interface information to the terminal, and deletes the current CSG identifier in the CSG list of the terminal;

Step S305, the terminal performs cell reselection according to its geographical location, and accesses a non-current CSG cell. For example, according to the configuration of the terminal, the operator's policy or the subscription data of the user, the terminal can access other CSG cells The cell can be connected to the cell of the macro cell, or can be connected to other wireless local area network cells, and step S308 is executed;

Step S306, the MME sends a handover request to the home base station connected to the terminal, the handover request carries the identifier of the terminal and the reason for the handover, the handover reason may include "CSG access is not allowed", the home base station according to the handover request Terminal ID, knowing the terminal that needs to be handed over, according to the reason for handover, the terminal can be handed over to the appropriate target base station, and the terminal will not be handed over to other home base stations in the prohibited CSG, where the target base station cannot be the home base station The home base station of the current CSG cannot be a base station in the handover restriction list of the terminal;

In step S307, after the home base station has successfully handed over the terminal to the target base station, the home base station deletes the current CSG identifier in the CSG list of the terminal, and the method for deleting the current CSG identifier is the same as step S304, and will not be repeated here;

If the terminal is not successfully handed over to the target base station, the current CSG identifier in the terminal's CSG list is also deleted. At this time, the MME can also wait for the terminal to transition from the connected state to the idle state, and then perform steps S304 to S305;

Step S308, the terminal is not allowed to continue to access any cell belonging to the current CSG. However, if the terminal is located in an area where there is only the signal of the CSG, when the terminal initiates an emergency call, the home base station of the CSG must Allow the terminal to access and make emergency calls.

Wherein, the handover request used above may be one of the following: handover trigger message, system architecture evolution bearer release command (SAE bearer release command), system architecture evolution bearer modification request (SAE bearer modification request), terminal context release command, etc. The following descriptions will be made respectively in conjunction with the accompanying drawings.

FIG. 4 is a flow chart of a terminal that uses a handover trigger process to transfer a connection state according to an embodiment of the present invention. As shown in FIG. 4 , it includes the following processing:

Step S401, when the CSG timer of a certain terminal in the MME expires and the terminal is in a connected state, the MME decides to let the home base station initiate a handover process, and handover the terminal to a suitable base station if conditions permit;

Step S402, the MME sends a handover trigger message to the home base station connected to the terminal, and the message carries the identity of the terminal and the reason for the handover;

Step S403, the home base station sends a handover trigger confirmation message to the MME, indicating that the handover trigger message is received;

Step S404, the home base station performs a handover process, and handovers the terminal to a suitable target base station. The target base station cannot be a home base station in the current CSG, nor can it be a base station or a cell in the handover restriction list of the terminal;

Step S405, delete the current CSG identifier in the CSG list of the terminal, this step is the same as step S304, and will not be repeated here.

In this embodiment, a terminal in a connected state in the CSG is transferred by using a handover triggering process, which ensures normal operation of user services and improves user perception and experience.

Fig. 5 is a flow chart of using the SAE bearer release process to transfer a connected state terminal according to an embodiment of the present invention, as shown in Fig. 5, including the following processing:

Step S501, the CSG timer of the terminal in the MME expires, and the terminal is in the connected state, then the MME decides to let the home base station initiate a handover process, and handover the terminal to a suitable base station;

Step S502, the MME sends an SAE bearer release command message to the home base station where the terminal is located, and the message carries the identification of the terminal and the reason for the handover;

Step S503, the home base station sends an SAE bearer release complete message to the MME, and prepares to initiate a handover procedure for the terminal;

Step S504, the home base station executes a handover process, and handovers the terminal to a suitable target base station, wherein the target base station cannot be a home base station in the current CSG, nor can it be a base station or a cell in the handover restriction list of the terminal;

Step S505, delete the current CSG identifier in the CSG list of the terminal, this step is the same as step S304, and will not be repeated here.

In this embodiment, the SAE bearer release process is used to transfer the terminal in the connected state in the CSG, which ensures the normal progress of the user service and improves the perception and experience of the user.

Fig. 5 is a flow chart of using the SAE bearer modification process to transfer a connected state terminal according to an embodiment of the present invention, as shown in Fig. 6, including the following processing:

Step S601, the CSG timer of the terminal in the MME expires, and the terminal is in the connected state, then the MME decides to let the home base station initiate a handover process, and handover the terminal to a suitable base station;

In step S602, the MME sends an SAE bearer modification request message to the home base station where the terminal is located. The message carries the identity of the terminal, and the cause value (Cause) in the message contains the reason "the current CSG is not allowed, and it is necessary to switch the Terminal” or similar reasons, the home base station receives the SAE bearer modification request message, determines the terminal that needs to be handed over, and the terminal is no longer allowed to access the current CSG;

Step S603, the home base station sends an SAE bearer modification response message to the MME, and prepares to initiate a handover procedure for the terminal;

Step S604, the home base station performs a handover process, and handovers the terminal to a suitable target base station, wherein the target base station cannot be the home base station in the current CSG, nor can it be a base station or a cell in the handover restriction list. At this time, the home base station Complete the switching process;

Step S605, delete the current CSG identifier in the CSG list of the terminal, this step is the same as step S304, and will not be repeated here.

In this embodiment, the SAE bearer modification process is used to transfer the terminal in the connected state in the CSG, which ensures normal operation of user services and improves user perception and experience.

FIG. 7 is a flow chart of a terminal that uses a terminal context release process to transfer a connection state according to an embodiment of the present invention. As shown in FIG. 7 , it includes the following processing:

Step S701, when the CSG timer of a certain terminal in the MME expires, and the terminal is in the connected state, the MME decides to let the home base station initiate a handover process, and handover the terminal to a suitable base station if conditions permit;

Step S702, the MME sends a terminal context release command message to the home base station connected to the terminal, and the message carries the identification of the terminal and the reason for the handover;

Step S703, the home base station sends a terminal context release complete message to the MME, and prepares to initiate a handover procedure for the terminal;

Step S704, the home base station performs a handover process, and switches the terminal to a suitable target base station. The target base station cannot be a home base station in the current CSG, nor can it be a base station or a cell in the terminal's handover restriction list;

Step S705, delete the current CSG identifier in the CSG list of the terminal, this step is the same as step S304, and will not be repeated here.

This embodiment utilizes the terminal context release process to transfer the terminal in the connected state in the CSG, which ensures the normal progress of the user service and improves the user's perception and experience.

FIG. 8 is a flow chart of a terminal transfer method when the terminal is in an idle state according to an embodiment of the present invention. As shown in FIG. 8 , it includes the following steps:

Step S801, the MME detects that the CSG timer of the terminal has expired, and the terminal is in an idle state, and the MME decides to delete the current CSG identifier in the CSG list of the terminal;

In step S802, the MME pages the terminal to make it enter the service request process. After the terminal establishes a signaling connection with the MME, delete the current CSG identifier in the terminal's CSG list. The method for deleting the current CSG identifier is the same as step S304, where No longer;

Step S803, the terminal disconnects from the current home base station;

Step S804, according to the cell selection criterion and the current situation, the terminal selects a suitable cell other than the current CSG to access, and executes a response process as required.

System embodiment

Fig. 9 shows a schematic diagram of a terminal transfer system according to an embodiment of the present invention, the system includes:

A state monitoring module 10, configured to monitor the state of the terminal;

The handover request module 20 is configured to send a request to the home base station if the state monitoring module 10 monitors that the terminal is in a connected state with the home base station when the terminal stays in the home base station belonging to the current internal user group for a time exceeding a predetermined time threshold. The base station sends a handover request, requesting the terminal to be handed over to the target base station (this can be indicated by the handover cause value), and carries the identifier of the terminal in the handover request. This module can be connected to the status monitoring module 10 . The target base station mentioned here is a home base station not belonging to the current CSG; or a base station not belonging to the handover restriction list of the terminal.

Further, the system further includes: a handover module (not shown in the figure), located in the home base station, used to receive the handover request, and handover the terminal to the target base station according to the identifier of the terminal, and this module can be connected to the handover request module 20 .

Through the terminal transfer system provided by the embodiment of the present invention, a terminal in the current CSG can be migrated to a base station not belonging to the current CSG, which improves user perception and experience.

According to an embodiment of the present invention, an MME is provided, and the MME is used to monitor the time that the terminal resides in the home base station belonging to the current CSG; when the time that the terminal resides in the home base station exceeds a predetermined time threshold, if the terminal In the connected state with the home base station, a handover request is sent to the home base station connected to the terminal, requesting the terminal to be handed over to the target base station, and the terminal identification is carried in the handover request.

The aforementioned target base station is a home base station not belonging to the current CSG; or a base station not belonging to the handover restriction list of the terminal.

As above, with the help of the MME, terminal transfer method and/or system provided by the present invention, the terminal in the current CSG is migrated to a base station not belonging to the current CSG, which ensures the normal operation of user services and improves user perception and experience, which is beneficial to the operator's customer maintenance.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (12)

1. A terminal transfer method, characterized in that, comprising: The mobility management entity monitors the residence time of the temporary user terminal in the home base station belonging to the current internal user group; When the time that the temporary user terminal resides in the home base station exceeds a predetermined time threshold, if the temporary user terminal is connected to the home base station, the mobility management entity sends a message to the temporary user terminal The connected home base station sends a handover request, requesting to handover the temporary user terminal to the target base station, and carries the identity of the temporary user terminal in the handover request. 2. The method according to claim 1, further comprising: The predetermined time threshold is preset. 3. The method according to claim 1, wherein the mobility management entity sending the handover request to the home base station connected to the temporary user terminal further comprises: The mobility management entity carries a handover cause identifier in the handover request, and the handover cause identifier is used to indicate that the temporary user terminal is not allowed to transfer to the home base station belonging to the current internal user group. 4. The method according to claim 1, wherein the method further comprises: Delete the identifier of the current internal user group in the internal user group list of the temporary user terminal. 5. The method according to claim 4, wherein the operation of deleting the identification of the current internal user group in the internal user group list of the temporary user terminal is one of the following: The mobility management entity sends non-access stratum signaling to the temporary user terminal, and deletes the identifier of the current internal user group in the internal user group list of the temporary user terminal; The home base station connected to the temporary user terminal sends wireless air interface information to the temporary user terminal, and deletes the identifier of the current internal user group in the internal user group list of the temporary user terminal. 6. The method according to any one of claims 1 to 5, further comprising: After receiving the handover request message, the home base station handovers the temporary user terminal to the target base station according to the identifier of the temporary user terminal. 7. The method according to any one of claims 1 to 5, characterized in that: The target base station is a home base station not belonging to the current internal user group or a base station not belonging to the handover restriction list of the temporary user terminal. 8. The method according to any one of claims 1 to 5, wherein the handover request includes one of the following: handover trigger message, system architecture evolution bearer release command (SAE bearer release command), system architecture evolution bearer The modification request is the SAE bearer modification request and the context release command of the temporary user terminal. 9. The method according to claim 1, wherein when the time that the temporary user terminal resides in the home base station exceeds a predetermined time threshold, if the temporary user terminal is in an idle state, the Methods also include: Delete the current internal user group identifier in the internal user group list of the temporary user terminal. 10. A terminal transfer system, characterized in that it comprises: A state monitoring module is used to monitor the state of the temporary user terminal; A handover request module, configured to send a request to The home base station sends a handover request, and carries the identity of the temporary user terminal in the handover request. 11. The system of claim 10, wherein: The handover request module is used to request handover of the temporary user terminal to a home base station not belonging to the current internal user group; or request handover of the temporary user terminal to a handover restriction not belonging to the temporary user terminal list of base stations. 12. The system according to claim 10 or 11, wherein the system further comprises: A handover module, located in the home base station, is configured to receive the handover request, and handover the temporary user terminal to a target base station according to the identity of the temporary user terminal.

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