CN107770829A

CN107770829A - A kind of terminal switching method, device and equipment

Info

Publication number: CN107770829A
Application number: CN201610685363.2A
Authority: CN
Inventors: 吴昊
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2016-08-17
Filing date: 2016-08-17
Publication date: 2018-03-06
Also published as: WO2018032741A1

Abstract

The embodiment of the invention discloses a kind of terminal switching method, device and equipment, methods described includes：First opposite end receives the first handover request；First opposite end performs the switching flow of the terminal according to first handover request；Wherein, first handover request at least includes：The network burst information that the mark of the terminal and the terminal have selected.

Description

Terminal switching method, device and equipment

Technical Field

The present invention relates to the field of wireless communications technologies, and in particular, to a method, an apparatus, and a device for terminal handover.

Background

Currently, 3GPP organization is discussing next generation network technology, and in a network architecture, a concept of network slice (i.e. a concept of a logical network is introduced in an entity network), and each network slice can provide a set of complete user plane and control panel functions facing a certain type of service or a certain type of scene. Through the network fragmentation technology, the terminal can select to use one network fragment according to the own service, and can also select to use a plurality of network fragments to enjoy the service provided by the network.

Since the concept of network fragmentation is introduced and the functions provided by the network are logically divided, when the terminal performs a handover operation, compared with the conventional mobility management, the mobility management process is more complicated because it needs to determine whether to consider the service continuity by considering the characteristics of the fragmentation, and at the same time, it needs to consider whether the target network element can support the service supported by the fragmentation of the source network element. Therefore, the problem of handover of the terminal under the network fragmentation architecture needs to be solved urgently.

Disclosure of Invention

The embodiment of the invention provides a terminal switching method, a device and equipment, which can enable a terminal to complete switching under a network fragmentation architecture.

The embodiment of the invention provides a terminal switching method, which comprises the following steps:

the first peer receives a first handover message;

the first opposite terminal executes the switching process of the terminal according to the first switching message;

wherein the first handover message comprises at least: the identifier of the terminal and the network fragmentation information selected by the terminal.

In the embodiment of the present invention, the network fragmentation information selected by the terminal is in any one of the following manners:

network fragment identification or combination of the network fragment identification and terminal information specific to the network fragment; or,

network fragment names or the combination of the network fragment names and terminal information specific to the network fragments; or,

network fragmentation capability, or a combination of network fragmentation capability and terminal information specific to network fragmentation; or,

information required for network fragmentation selection includes one or more of the following: the type of the terminal, the type of the service, and the subscription data of the terminal.

In this embodiment of the present invention, the receiving, by the first peer end, a first handover message and executing a handover procedure of the terminal includes:

the first peer end receives the first switching message sent by a source wireless access network;

and the first peer end establishes connection or interface with a network fragment corresponding to the network fragment information selected by the terminal in a core network element according to the network fragment information selected by the terminal in the first switching message.

In the embodiment of the present invention, the method further includes:

the first opposite terminal receives data sent by the terminal after moving to the target wireless access network;

and the first opposite end sends the received data through the established connection or interface.

The embodiment of the invention also provides a terminal switching method, which comprises the following steps:

the second opposite end receives a second switching message;

the second terminal obtains the network fragmentation information selected by the terminal according to the second switching message;

the second terminal executes the switching process of the terminal according to the network fragmentation information selected by the terminal;

wherein the second handover message comprises at least: and the identification of the terminal.

In this embodiment of the present invention, the obtaining, by the second peer, the network fragmentation information selected by the terminal according to the second handover message includes:

and the second opposite terminal acquires the network fragmentation information selected by the terminal from locally stored terminal information according to the identifier of the terminal in the second switching message.

In this embodiment of the present invention, the second handover message further includes: network fragmentation information selected by the terminal; accordingly, the method can be used for solving the problems that,

the second peer obtains the network fragmentation information selected by the terminal according to the second switching message, including:

and the second terminal reads the network fragmentation information selected by the terminal in the received second switching message.

In this embodiment of the present invention, the executing, by the second peer, the handover procedure of the terminal according to the network fragmentation information selected by the terminal includes:

the second terminal selects a target core network element according to the network fragmentation information selected by the terminal;

and the second opposite terminal sends a re-allocation request message to the target core network element, wherein the re-allocation request message comprises the network fragmentation information selected by the terminal.

the third opposite terminal receives a third switching message;

the third opposite terminal executes the switching process of the terminal according to the third switching message;

wherein the third handover message comprises at least: network fragmentation information that the terminal has selected.

In this embodiment of the present invention, the executing, by the third peer end, the handover procedure of the terminal according to the third handover message includes:

after receiving the third switching message, the third opposite terminal selects a network fragment for the terminal according to the network fragment information selected by the terminal in the third switching message;

the third opposite terminal sends a fourth switching message to the radio access network element, wherein the fourth switching message is used for informing the radio access network element of the change of the core network element serving the terminal;

and the third opposite terminal receives the data transmitted by the terminal and forwarded by the network element of the wireless access network.

The embodiment of the invention also provides a terminal switching device, which comprises:

a first receiving unit for receiving a first handover message;

a first processing unit, configured to execute a handover procedure of the terminal according to the first handover message;

In this embodiment of the present invention, the first receiving unit is configured to receive the first handover message sent by the source radio access network;

a first processing unit, configured to establish a connection or an interface with a network slice in a core network element corresponding to the network slice information selected by the terminal according to the network slice information selected by the terminal in the first handover message.

In the embodiment of the present invention, the apparatus further includes:

a second receiving unit, configured to receive data sent after the terminal moves to the target radio access network;

a first sending unit, configured to send the received data through the established connection or interface.

The embodiment of the invention provides a wireless access network element, which comprises: the terminal switching device described above.

a third receiving unit, configured to receive a second handover message;

a first obtaining unit, configured to obtain network fragmentation information selected by the terminal according to the second handover message;

the second processing unit is used for executing the switching process of the terminal according to the network fragmentation information selected by the terminal;

a first obtaining unit, configured to read the network fragmentation information selected by the terminal in the received second handover message.

In an embodiment of the present invention, the second processing unit includes:

the first selection subunit is used for selecting a target core network element according to the network fragmentation information selected by the terminal;

and the first sending subunit is configured to send a reallocation request message to the target core network element, where the reallocation request message includes network fragmentation information that has been selected by the terminal.

An embodiment of the present invention provides a core network element, where the core network element includes: the terminal switching device described above.

a fourth receiving unit, configured to receive a third handover message;

a third processing unit, configured to execute a handover procedure of the terminal according to the third handover message;

In an embodiment of the present invention, the third processing unit includes:

a second selecting subunit, configured to select a network segment for the terminal according to the network segment information selected by the terminal in the third handover message after receiving the third handover message;

a second sending subunit, configured to send a fourth handover message to a radio access network element, where the fourth handover message is used to notify the radio access network element of a change of a core network element serving the terminal;

and the first receiving subunit is configured to receive the data sent by the terminal and forwarded by the radio access network element.

Compared with the prior art, the invention comprises the following steps: the first peer receives a first handover message; the first opposite terminal executes the switching process of the terminal according to the first switching message; wherein the first handover message comprises at least: the identifier of the terminal and the network fragmentation information selected by the terminal. In the terminal switching process, the network fragmentation information selected by the terminal is exchanged between the wireless access network elements or the core network elements, and the appropriate target wireless access network element or the core network element can be selected through the information source wireless access network elements or the core network elements, so that the terminal is switched under the framework of network fragmentation.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.

FIG. 1 is a schematic diagram of the general architecture of a next generation mobile communication network;

fig. 2 is a first schematic flow chart of a terminal switching method according to an embodiment of the present invention;

fig. 3 is a schematic flow chart of a terminal switching method according to an embodiment of the present invention;

fig. 4 is a third schematic flowchart of a terminal switching method according to an embodiment of the present invention;

fig. 5 is a first schematic structural diagram of a terminal switching device according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a terminal switching device according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a terminal switching device according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a second processing unit according to an embodiment of the present invention;

fig. 9 is a fourth schematic structural diagram of the terminal switching device according to the embodiment of the present invention;

fig. 10 is a schematic structural diagram of a third processing unit according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.

First, the general architecture of the next generation mobile communication network is briefly introduced, as shown in fig. 1:

NextGen UE refers to a next generation terminal, NextGen RAN refers to a next generation radio access Network, NextGencore refers to a next generation core Network, and Data Network is a Data Network. In the embodiment of the present invention, the above three entities are referred to by a terminal, a radio access network element, and a core network element, respectively.

In the above general architecture, the core network elements are further fragmented, that is, a set is formulated according to a certain criterion, and is used for managing and serving a certain type of terminals. After network fragmentation is performed, combination can be performed according to different types of terminals or different types of services, and configuration and use of resources are reasonably optimized, for example: the terminal only having the calling service is configured with one network fragment, so that the paging resource is not configured, the bearing resource with higher QoS is distributed to the terminal of the high-reliability service, and the service time delay is ensured to be as short as possible and the service continuity is not damaged. Therefore, the terminal can select to use one network segment according to the own service, and can also select to use a plurality of network segments to enjoy the service provided by the network.

In a mobile communication network, cells have a certain coverage, that is, each physical network element can only provide service within a certain range, when a terminal crosses the service range of the physical network element during moving, other network elements are required to provide service, and the process of replacing the service network element is called handover. The handover is to ensure that the terminal can continuously receive the service provided by the network.

An embodiment of the present invention provides a terminal switching method, as shown in fig. 2, the method includes:

step 201: the first peer receives a first handover message; the first handover message comprises at least: the identifier of the terminal and the network fragmentation information selected by the terminal;

step 202: and the first opposite terminal executes the switching process of the terminal according to the first switching message.

Here, the first peer may include: a target radio access network element; correspondingly, in the embodiments of the present invention, the terminal is handed over from one radio access network element to another (target) radio access network element.

In the embodiment of the present invention, the network segment information selected by the terminal refers to a network segment that is selected by the current network for providing a service for the terminal, and may be one network segment or multiple network segments.

The network fragmentation information selected by the terminal may be in any one of the following manners:

1) network fragment identification or combination of the network fragment identification and terminal information specific to the network fragment;

here, when the network has only one fragment, the network fragment identifier is an ID, and when there are multiple fragments, the network fragment identifier is an ID list. When network fragment identities are used, different identities may represent network fragments providing different services. For example, the ID NS001 indicates a network fragment providing only the calling service; the ID NS002 indicates a network segment providing a high delay service.

When the network fragment identifier is used, the network fragment identifier may be classified according to different company logical private networks except for service classification, where a logical private network refers to a network resource allocated according to the requirement of the private network and a certain access criterion under the same physical network element and is only used by a terminal specified by the company, for example, the network fragment identifier identifies a chinese power grid with an ID of NS 003; and (5) identifying the Chinese petroleum by ID (NS 004).

In addition to the network segment identifier, the identifier corresponding to each network segment may also contain "network segment specific terminal information". The terminal information specific to the network fragment refers to the relevant parameters of the terminal in different network fragments. For example, the ID is NS0001+ "terminal reachability detection period", which refers to a parameter specified in the network segment with the ID of NS0001 in the present embodiment.

Or,

2) network fragment names or the combination of the network fragment names and terminal information specific to the network fragments;

for example, a network segment Name (Name) identifies a service providing only a calling service, and a Name identifies a network segment providing a High latency service. Like 1), when Name is a chinese power grid, it may represent that this is a logical private network of the chinese power grid, and when Name is a chinese oil, it represents that this is a logical private network of the chinese oil; the terminal information "specific to the network segment" is the same as that in 1), and detailed description is omitted.

Or,

3) network fragmentation capability, or a combination of network fragmentation capability and terminal information specific to network fragmentation;

examples are similar to 2), e.g. the same as in network fragmentation Capability (Capability) ═ MO only or Capability ═ highltransency, the network fragmentation specific terminal information "follows 1).

Or,

4) information required for network fragmentation selection includes one or more of the following: the type of the terminal, the type of the service and the subscription data of the terminal;

the operator can select the required information according to the network fragments, and decide which network fragment or fragments to use for providing service for the terminal.

In the embodiment of the present invention, the method further includes:

In the terminal switching process, the network fragmentation information selected by the terminal is exchanged between the wireless access network elements or the core network elements, and the appropriate target wireless access network element or the core network element can be selected through the information source wireless access network elements or the core network elements, so that the terminal is switched under the framework of network fragmentation.

An embodiment of the present invention further provides a terminal switching method, as shown in fig. 3, the method includes:

step 301: the second opposite end receives a second switching message; the second handover message comprises at least: an identity of the terminal;

step 302: the second terminal obtains the network fragmentation information selected by the terminal according to the second switching message;

step 303: and the second opposite terminal executes the switching process of the terminal according to the network fragmentation information selected by the terminal.

Here, the second peer may include: a source core network element, and correspondingly, the terminal will switch from one (source) core network element to another (target) core network element.

In the embodiment of the present invention, the network fragmentation information selected by the terminal may be in any one of the following manners:

Or,

Here, the selecting a target core network element according to the network fragmentation information selected by the terminal includes:

selecting a core network element supporting all network fragments indicated in the network fragment information selected by the terminal as a target core network element; or,

and if the core network elements which can support all the network fragments cannot be found, selecting the core network element which supports the most network fragments selected by the terminal as the target core network element. For example: the network segments selected by the terminal are NS1, NS2 and NS3, and the network elements of the alternative core network are network element 1: support NS1, network element 2: supporting NS1, NS2, then network element 2 is selected as the target core network element.

An embodiment of the present invention further provides a terminal switching method, as shown in fig. 4, the method includes:

step 401: the third opposite terminal receives a third switching message; the third handover message comprises at least: network fragmentation information selected by the terminal;

step 402: and the third opposite terminal executes the switching process of the terminal according to the third switching message.

In this embodiment of the present invention, the third peer end may include: and the target core network element, correspondingly, the terminal is switched from one core network element to another (target) core network element.

Or,

the third opposite terminal sends a fourth switching message (for example, a state updating notification message) to the radio access network element, where the fourth switching message is used to notify the radio access network element of the change of the core network element serving the terminal;

The embodiment of the invention also provides a storage medium. Optionally, in this embodiment, the storage medium may be configured to store data for performing the above steps of the embodiment of the present invention, and will not be described in detail here. The storage medium may include, but is not limited to: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk, which can store program codes.

The following description of the embodiments of the apparatus is similar to the above description of the method and has the same beneficial effects as the embodiments of the method, and therefore, the description thereof is omitted. For technical details that are not disclosed in the embodiments of the apparatus of the present invention, those skilled in the art should refer to the description of the embodiments of the method of the present invention to understand, and for brevity, will not be described again here.

An embodiment of the present invention further provides a terminal switching device, as shown in fig. 5, the device includes:

a first receiving unit 501, configured to receive a first handover message;

a first processing unit 502, configured to execute a handover procedure of the terminal according to the first handover message;

In an embodiment of the present invention, the terminal is handed over from one radio access network element to another (target) radio access network element.

Or,

the operator can select the required information according to the network fragments, and decide which network fragment or fragments to use for providing service for the terminal. In this embodiment of the present invention, the first receiving unit 501 is configured to receive the first handover message sent by a source radio access network;

a first processing unit 502, configured to establish a connection or an interface with a network slice in a core network element corresponding to the network slice information selected by the terminal according to the network slice information selected by the terminal in the first handover message.

In the embodiment of the present invention, as shown in fig. 6, the apparatus further includes:

a second receiving unit 503, configured to receive data sent after the terminal moves to the target radio access network;

a first sending unit 504, configured to send the received data through the established connection or interface.

An embodiment of the present invention further provides a terminal switching device, as shown in fig. 7, the device includes:

a third receiving unit 701, configured to receive a second handover message;

a first obtaining unit 702, configured to obtain network fragmentation information selected by the terminal according to the second handover message;

a second processing unit 703, configured to execute a handover procedure of the terminal according to the network fragmentation information selected by the terminal;

In the embodiment of the present invention, the terminal switches from one (source) core network element to another (target) core network element.

Or,

a first obtaining unit 702, configured to read the network fragmentation information selected by the terminal in the received second handover message.

In this embodiment of the present invention, as shown in fig. 8, the second processing unit 703 includes:

a first selecting subunit 7031, configured to select a target core network element according to the network fragmentation information selected by the terminal;

a first sending subunit 7032, configured to send a reallocation request message to the target core network element, where the reallocation request message includes network fragmentation information that has been selected by the terminal.

An embodiment of the present invention further provides a terminal switching device, as shown in fig. 9, the terminal switching device includes:

a fourth receiving unit 901, configured to receive a third handover message;

a third processing unit 902, configured to execute a handover procedure of the terminal according to the third handover message;

In the embodiments of the present invention, the terminal switches from one core network element to another (target) core network element.

Or,

In this embodiment of the present invention, as shown in fig. 10, the third processing unit 902 includes:

a second selecting subunit 9021, configured to select a network segment for the terminal according to the network segment information that is selected by the terminal in the third handover message after the third handover message is received;

a second sending subunit 9022, configured to send a fourth handover message to the radio access network element, where the fourth handover message is used to notify the radio access network element of a change of a core network element serving the terminal;

a first receiving subunit 9023, configured to receive the data sent by the terminal and forwarded by the radio access network element.

An embodiment of the present invention further provides a radio access network element, where the radio access network element includes: the terminal switching device described in fig. 5 or fig. 6.

An embodiment of the present invention further provides a core network element, where the core network element includes: the terminal switching device described in fig. 7 or fig. 8.

An embodiment of the present invention further provides a core network element, where the core network element includes: the terminal switching device described in fig. 9 or fig. 10.

The present invention will be described in detail with reference to specific embodiments.

Embodiment one (exchange fragment information between wireless access network elements)

In the embodiment of the invention, when the terminal moves to the edge of the wireless access network element, the terminal needs to be switched to another wireless access network element, but is still in the service range of the same core network element, and the original wireless access network element selects the target wireless access network element according to the moving direction of the terminal and the position of the target wireless access network element.

The method comprises the following steps: the original wireless access network element sends a switching request to a target access network element, and the request message contains the identifier of the terminal to be switched and 'network fragmentation information selected by the terminal'.

The "network fragment information selected by the terminal" refers to a network fragment which is selected by the current network for providing a service for the terminal, and may be one network fragment or a plurality of network fragments. The "network fragmentation information selected by the terminal" may have the following forms:

A) the method comprises the following steps Network segment identity or (network segment identity + network segment specific terminal information):

when only one fragment exists, the network fragment identifier is an ID, and when a plurality of fragments exist, the network fragment identifier is a list;

when network fragment identities are used, different identities may represent network fragments providing different services. For example, ID NS001 identifies a network segment providing only the originating service, and ID NS002 identifies a network segment providing a high latency service.

When the network fragment identifier is used, it may be a logical private network according to different companies besides the service classification, where the logical private network refers to a network resource allocated according to the requirement of the private network and a certain access criterion under the same physical network element and is only used by a terminal specified by the company, for example, the network fragment identifier identifies a chinese power grid, and the network fragment identifier identifies chinese oil, where the network fragment identifier is ID NS 003.

In addition to the network segment identifier, the identifier corresponding to each network segment may also contain "network segment specific terminal information". The "network slice specific terminal information" refers to the relevant parameters of the terminal in different network slices. For example, (ID ═ NS0001+ "terminal reachability detection period"), here "terminal reachability detection period" refers to a parameter specified in the network segment whose ID is NS 0001.

Or,

B) the method comprises the following steps Network segment name or (network segment name + network segment specific terminal information):

for example, the Name only Slice identifies a service providing only a calling service, and the Name High latency Slice identifies a network Slice providing a High latency service. Like a), when Name is a chinese power grid, it may represent that this is a logical private network of the chinese power grid, and when Name is a chinese oil, it represents that this is a logical private network of the chinese oil. The "network slice specific terminal information" is the same as in a).

Or,

C) the method comprises the following steps Network fragmentation capability or (network fragmentation capability + network fragmentation specific terminal information):

examples are similar to B), for example Capability — MO only or Capability — High latency. The "network slice specific terminal information" is the same as in a).

Or,

D) the method comprises the following steps The information required by network fragment selection is as follows: one or more of these pieces of information may be: the type of the terminal, the type of the service, the subscription data of the terminal, and the operator can determine which network segment or network segments to use to provide service for the terminal.

Step two: and after receiving the switching request message, the target radio access network element establishes a connection or an interface of the network fragment corresponding to the network fragment information selected by the terminal in the core network element according to the received network fragment information selected by the terminal.

Step three: and after the terminal moves to the target wireless access network element, sending the data to the target access network element, so that the target access network element can send the data of the terminal to the core network according to the connection or interface which is established in the last step and is fragmented with the network of the core network to realize communication.

Embodiment two (exchange fragmentation information between core network elements)

Compared with the first embodiment, the terminal in this embodiment moves not only to the edge of the cell, but also to the edge of the service range of the core network element, and needs to perform handover across the core network elements.

The method comprises the following steps: the network element of the wireless access network sends a switching request to the network element of the prokaryotic core network which provides service for the terminal at present, and the request message comprises the identification of the terminal which needs to be switched.

Step two: the original core network element obtains 'network fragmentation information selected by a terminal' from locally stored terminal information according to the identifier of the terminal. The specific form of the network fragmentation information selected by the terminal is the same as that in the first embodiment. The description is not repeated here.

Step three: and the original core network element selects the target core network element according to the network fragmentation information selected by the terminal. The selection method comprises the following steps:

1) selecting a core network element supporting all network fragments indicated in the 'network fragment information selected by the terminal' as a target core network element; or,

2) and if the core network elements which can support all the network fragments cannot be found, selecting the core network element which supports the most network fragments selected by the terminal as the target core network element. For example, the network segments selected by the terminal are NS1, NS2 and NS3, and the network elements of the alternative core network are network element 1: support NS1, network element 2: supporting NS1, NS2, then network element 2 is selected as the target core network element.

Step four: the original core network element sends a redistribution request to the target core network element, and the request message contains the network fragmentation information selected by the terminal.

Step five: after receiving the reallocation request message, the target core network element selects network fragments for the terminal according to the network fragment information selected by the terminal;

here, if the target core network element cannot provide the network slice information that all terminals have selected, the terminal is served using the default network slice.

Step six: and the target core network element sends a state updating notification message to the wireless access network element to notify that the core network element serving the terminal is changed, and then the wireless access network element sends the data of the terminal to the target core network element to realize communication.

Embodiment three (exchange of fragmentation information between core network elements, but fragmentation information is provided by radio access network elements)

The method comprises the following steps: the network element of the wireless access network sends a switching request to the network element of the prokaryotic core network which provides service for the terminal at present, and the request message comprises the identification of the terminal to be switched and the 'network fragmentation information selected by the terminal'.

Step two: after receiving the switching request message, the original core network element reads the 'network fragmentation information selected by the terminal'.

Step five: and after receiving the reallocation request message, the target core network element selects the network fragment for the terminal according to the network fragment information selected by the terminal.

Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A terminal switching method is characterized by comprising the following steps:

the first peer receives a first handover message;

2. The terminal switching method according to claim 1, wherein the network fragmentation information selected by the terminal is any one of the following modes:

3. The method according to claim 1, wherein the first peer end receives a first handover message and performs a handover procedure of the terminal, comprising:

4. The terminal switching method according to claim 3, wherein the method further comprises:

5. A terminal switching method is characterized by comprising the following steps:

the second opposite end receives a second switching message;

6. The terminal switching method according to claim 5, wherein the network fragmentation information selected by the terminal is any one of the following modes:

7. The terminal switching method according to claim 5, wherein the second peer obtains the network fragmentation information selected by the terminal according to the second switching message, and includes:

8. The terminal handover method according to claim 5, wherein the second handover message further comprises: network fragmentation information selected by the terminal; accordingly, the method can be used for solving the problems that,

9. The terminal switching method according to claim 5, wherein the second peer performs the switching process of the terminal according to the network fragmentation information selected by the terminal, and the method comprises:

10. A terminal switching method is characterized by comprising the following steps:

the third opposite terminal receives a third switching message;

11. The terminal switching method according to claim 10, wherein the network fragmentation information selected by the terminal is any one of the following modes:

12. The terminal handover method according to claim 10, wherein the third peer performs the handover procedure of the terminal according to the third handover message, including:

13. A terminal switching apparatus, comprising:

a first receiving unit for receiving a first handover message;

14. The apparatus according to claim 13, wherein the network fragmentation information selected by the terminal is any of the following:

15. The terminal switching device according to claim 13,

a first receiving unit, configured to receive the first handover message sent by a source radio access network;

16. The terminal switching device according to claim 15, further comprising:

17. A terminal switching apparatus, comprising:

a third receiving unit, configured to receive a second handover message;

18. The apparatus according to claim 17, wherein the network fragmentation information selected by the terminal is any of the following:

19. The terminal switching apparatus according to claim 17, wherein the second handover message further comprises: network fragmentation information selected by the terminal; accordingly, the method can be used for solving the problems that,

20. The terminal switching device according to claim 17, wherein the second processing unit comprises:

21. A terminal switching apparatus, comprising:

a fourth receiving unit, configured to receive a third handover message;

22. The apparatus according to claim 21, wherein the network fragmentation information selected by the terminal is any of the following:

23. The terminal switching device according to claim 21, wherein the third processing unit comprises:

24. A radio access network element, wherein the radio access network element comprises: the terminal switching device of any one of claims 13-16.

25. A core network element, wherein the core network element comprises: the terminal switching device of any one of claims 17-20; or, the terminal switching device of any of claims 21-23.