CN113286338A

CN113286338A - Switching method, communication device, chip and module equipment thereof

Info

Publication number: CN113286338A
Application number: CN202110503516.8A
Authority: CN
Inventors: 倪金金; 金逸
Original assignee: Spreadtrum Communications Shanghai Co Ltd
Current assignee: Spreadtrum Communications Shanghai Co Ltd
Priority date: 2021-05-08
Filing date: 2021-05-08
Publication date: 2021-08-20
Anticipated expiration: 2041-05-08
Also published as: CN113286338B

Abstract

The application discloses a switching method, a communication device, a chip and module equipment thereof, wherein the method comprises the following steps: under the condition that the service of the terminal equipment is borne in the first network, the terminal equipment sends a first session switching request to the second network; the first session handover request may be for requesting a subsequent service of the terminal device to be carried over the second network; the terminal equipment receives switching indication information from the second network, wherein the switching indication information is used for indicating the terminal equipment to switch from an access network of the second network to an access network of a third network; the terminal equipment is switched from the access network of the second network to the access network of the third network according to the switching indication information; and under the condition that the terminal equipment is switched from the access network of the second network to the access network of the third network, the subsequent service of the terminal equipment is transmitted through the access network of the third network. By implementing the method provided by the application, the continuity of the service of the terminal equipment can be ensured.

Description

Switching method, communication device, chip and module equipment thereof

Technical Field

The present application relates to the field of communications technologies, and in particular, to a switching method, a communication device, a chip, and a module device thereof.

Background

Currently, a terminal device may be registered on both networks simultaneously. For example, the mobile communication terminal is registered on a Wireless Fidelity (WiFi) network and a fifth generation (5th generation, 5G) mobile communication network at the same time. The terminal device can initiate a voice service in a mode of providing voice over WiFi (VoWiFi) through a WiFi network, and in a VoWiFi call process, if a signal of the WiFi network is degraded, the terminal device can initiate a handover procedure from the WiFi network to a 5G network during the VoWiFi call.

However, if the 5G network cannot carry the voice service of the terminal device, the handover procedure may fail, which may cause service interruption of the terminal device.

Disclosure of Invention

The application discloses a switching method, a communication device, a chip and module equipment thereof, which can ensure the continuity of terminal equipment services.

In a first aspect, the present application provides a handover method, including: under the condition that the service of the terminal equipment is borne in the first network, the terminal equipment sends a first session switching request to the second network; the first session handover request may be for requesting a subsequent service of the terminal device to be carried over the second network; the terminal equipment receives switching indication information from the second network, wherein the switching indication information is used for indicating the terminal equipment to switch from an access network of the second network to an access network of a third network; the switching indication information is sent by the second network under the condition that the access network of the second network cannot bear the subsequent service of the terminal equipment; the terminal equipment is switched from the access network of the second network to the access network of the third network according to the switching indication information; and under the condition that the terminal equipment is switched from the access network of the second network to the access network of the third network, the subsequent service of the terminal equipment is transmitted through the access network of the third network.

In one implementation, the method further includes: the terminal device may receive a first session handover response from the third network, where the first session handover response is used to indicate that the terminal device successfully accesses the core network of the third network; and under the condition that the terminal equipment is successfully accessed to the core network of the third network, the subsequent service of the terminal equipment is transmitted through the core network of the third network.

In one implementation, before the terminal device receives the first session handover response from the third network, the method further includes: the terminal device may receive a second session handover response from the second network, where the second session handover response may be used to indicate that the second network cannot carry subsequent traffic of the terminal device.

In one implementation, before the terminal device receives the first session handover response from the third network, the method further includes: after the terminal device switches to the access network and the core network of the third network, the terminal device may send a second session switching request to the third network according to the second session switching response; the second session handover request is used to request the access network and the core network of the third network to carry the subsequent service of the terminal device.

In one implementation, the first network is a non-3 GPP network, and the second network and the third network are 3GPP networks.

In a second aspect, an embodiment of the present application provides another handover method, where the method includes: a core network element of the second network may receive the first session handover request from the terminal device; the first session switching request is used for requesting a subsequent service of the terminal equipment carried by a second network; the first session switching request is sent by the terminal equipment under the condition that the service of the terminal equipment is borne in the first network; when the access network of the second network cannot carry the subsequent service of the terminal device, the core network element of the second network may send switching indication information to the terminal device, where the switching indication information is used to indicate that the terminal device is switched from the access network of the second network to the access network of the third network.

In one implementation, the method further includes: the core network element of the second network may send a third session handover request to the core network element of the third network, where the third session handover request may be used to request that a subsequent service of the terminal device is carried through an access network and the core network of the third network.

In one implementation, the method further includes: and the core network element of the second network sends a second session switching response to the terminal equipment, wherein the second session switching response is used for indicating that the second network cannot bear the subsequent service of the terminal equipment.

In a third aspect, the present application provides a communication device comprising means for implementing the method of the first aspect and any of its possible implementations, or comprising means for implementing the method of the second aspect and any of its possible implementations.

In a fourth aspect, the present application provides a communication device comprising a processor configured to perform the method of the first aspect and any of its possible implementations or to implement the method of the second aspect and any of its possible implementations.

In a fifth aspect, the present application provides a communication device comprising a processor and a memory for storing computer-executable instructions; the processor is configured to invoke the program code from the memory to perform the method of the first aspect and any of its possible implementations, or to implement the method of the second aspect and any of its possible implementations.

In a sixth aspect, the present application provides a chip, configured to send a first session handover request to a second network; the first session switching request is used for requesting a subsequent service of the terminal equipment carried by a second network; the first session switching request is sent by the terminal equipment under the condition that the service of the terminal equipment is borne in the first network; receiving switching indication information from the second network, wherein the switching indication information is used for indicating the terminal equipment to be switched from an access network of the second network to an access network of a third network; the switching indication information is sent by the second network under the condition that the access network of the second network can not bear the subsequent service of the terminal equipment; switching from the access network of the second network to the access network of the third network according to the switching indication information; and under the condition that the terminal equipment is switched from the access network of the second network to the access network of the third network, the subsequent service of the terminal equipment is transmitted through the access network of the third network.

In a seventh aspect, the present application provides another chip, where the chip is configured to receive a first session switching request from a terminal device; the first session switching request is used for requesting a subsequent service of the terminal equipment carried by a second network; the first session switching request is sent by the terminal equipment under the condition that the service of the terminal equipment is borne in the first network; and under the condition that the access network of the second network cannot bear the subsequent service of the terminal equipment, sending switching indication information to the terminal equipment, wherein the switching indication information is used for indicating the terminal equipment to be switched from the access network of the second network to the access network of a third network.

In an eighth aspect, the present application provides a module device, which includes a communication module, a power module, a storage module, and a chip module, wherein: the power module is used for providing electric energy for the module equipment; the storage module is used for storing data and instructions; the communication module is used for carrying out internal communication of the module equipment or is used for carrying out communication between the module equipment and external equipment; this chip module is used for: sending a first session handover request to a second network; the first session switching request is used for requesting a subsequent service of the terminal equipment carried by a second network; the first session switching request is sent by the terminal equipment under the condition that the service of the terminal equipment is borne in the first network; receiving switching indication information from the second network, wherein the switching indication information is used for indicating the terminal equipment to be switched from an access network of the second network to an access network of a third network; the switching indication information is sent by the second network under the condition that the access network of the second network can not bear the subsequent service of the terminal equipment; switching from the access network of the second network to the access network of the third network according to the switching indication information; and under the condition that the terminal equipment is switched from the access network of the second network to the access network of the third network, the subsequent service of the terminal equipment is transmitted through the access network of the third network.

In a ninth aspect, the present application provides another module device, which includes a communication module, a power module, a storage module, and a chip module, wherein: the power module is used for providing electric energy for the module equipment; the storage module is used for storing data and instructions; the communication module is used for carrying out internal communication of the module equipment or is used for carrying out communication between the module equipment and external equipment; this chip module is used for: receiving a first session switching request from terminal equipment; the first session switching request is used for requesting a subsequent service of the terminal equipment carried by a second network; the first session switching request is sent by the terminal equipment under the condition that the service of the terminal equipment is borne in the first network; and under the condition that the access network of the second network cannot bear the subsequent service of the terminal equipment, sending switching indication information to the terminal equipment, wherein the switching indication information is used for indicating the terminal equipment to be switched from the access network of the second network to the access network of a third network.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is an architecture diagram of a communication system according to an embodiment of the present application;

fig. 2 is a schematic flowchart of a handover method according to an embodiment of the present application;

fig. 2A is a flowchart illustrating an exemplary handover method according to an embodiment of the present application.

Fig. 3 is a schematic flowchart of another handover method according to an embodiment of the present application;

fig. 3A is a schematic flowchart of another exemplary handover method provided in the embodiment of the present application;

fig. 4 is a schematic flowchart of another handover method according to an embodiment of the present application;

fig. 4A is a schematic flowchart of another exemplary handover method provided in the embodiment of the present application;

fig. 5 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of another communication device according to an embodiment of the present application;

fig. 7 is a schematic diagram of a communication device 70 according to an embodiment of the present application;

fig. 8 is a schematic diagram of a communication device 80 according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of a module device according to an embodiment of the present application

Fig. 10 is a schematic structural diagram of another module apparatus according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, fig. 1 is an architecture diagram of a communication system according to an embodiment of the present disclosure. As shown in fig. 1, the communication system may include a terminal device 101, an access network device 102 of a second network, and a core network device 103 of the second network. It should be noted that the terminal device provided in the embodiment of the present application is a terminal device that can be registered on two networks at the same time. Illustratively, in fig. 1, the terminal device 101 is registered on both the first network and the second network.

The terminal device 101 is an entity, such as a mobile phone, on the user side for receiving or transmitting signals. The terminal device may also be referred to as a terminal (terminal), a User Equipment (UE), a Mobile Station (MS), a Mobile Terminal (MT), or the like. The mobile device may be a mobile phone (mobile phone), a wearable device, a tablet (Pad), a computer with wireless transceiving function, a Virtual Reality (VR) terminal device, an Augmented Reality (AR) terminal device, a wireless terminal in industrial control (industrial control), a wireless terminal in self-driving (self-driving), a wireless terminal in remote surgery (remote surgery), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety (transportation safety), a wireless terminal in city (city), a wireless terminal in smart home (smart home), a device for supporting enhanced Machine-Type communication (eMTC), and/or a Long Term Evolution (LTE) terminal supporting general mobile communication technology, and so on. The embodiment of the present application does not limit the specific technology and the specific device form adopted by the terminal device.

The terminal device 101 may access a first Network in a non-3 GPP manner, where the first Network may be a Wireless Local Area Network (WLAN), a High Rate Packet Data (HRPD), or the like. The terminal device 101 may access a second network in a 3GPP manner, where the second network may be a fifth generation (5th generation, 5G) mobile communication network, a fourth generation (4th generation, 4G) mobile communication network, and the like. Optionally, in fig. 1, the network device corresponding to the second network (the access network device 102 of the second network and the core network device 103 of the second network) may be a network device corresponding to a 5G network, and may also be a network device corresponding to a 4G network, which is not limited in this application.

An access network device (e.g. the access network device 102 of the second network, hereinafter referred to as an access network device of a third network) is an entity on the network side for transmitting or receiving signals. For example, the access network device of the second network may be an evolved NodeB (eNB), a transmission point (TRP), a next generation base station (gNB) in the NR system, a base station in another future mobile communication system, and the like. The embodiment of the present application does not limit the specific technology and the specific device form adopted by the access network device.

A core network device (e.g. the second core network device 103, hereinafter referred to as a core network device of a third network) is a device on the network side for managing a user. For example, the core network device of the second network may be a Mobility Management function (AMF) network element or a Mobility Management Entity (MME) or the like. The embodiment of the present application does not limit the specific technology and the specific device form adopted by the core network device.

It should be noted that the technical solutions of the embodiments of the present application can be applied to various communication systems. For example: an LTE system, a 5G mobile communication system, and a 5G New Radio (NR) system. Optionally, the method of the embodiment of the present application is also applicable to various future communication systems, such as a 6G system or other communication networks.

Referring to fig. 2, fig. 2 is a schematic flow chart illustrating a handover method according to an embodiment of the present disclosure. The switching method may be implemented by the terminal device and a core network element of the second network, or may be implemented by a chip in the terminal device and a chip in the core network element of the second network. As shown in fig. 2, the switching method includes, but is not limited to, the following steps S201 to S203.

Step S201, under the condition that the service of the terminal equipment is borne in the first network, the terminal equipment sends a first session switching request to the second network; the first session handover request may be for requesting subsequent traffic for carrying the terminal device over the second network. Accordingly, the second network may receive the first session handoff request.

It should be noted that, in the embodiments of the present application, the receiving of some information (e.g., the first session handover request) by the network (e.g., the second network, the third network) may refer to: a core network element of the network receives the information. Similarly, the network (e.g., the second network, the third network) sending some information (e.g., the handover indication information) may refer to: the core network element of the network sends the information.

In one implementation, the sending, by the terminal device, the first session handover request to the second network may refer to: and the terminal equipment sends a first session switching request to a core network element of the second network. If the second network is 5G, the core network element of the second network may be an AMF. If the second network is 4G, the core network element of the second network may be an MME.

It should be noted that the terminal device may perform direct communication or indirect communication with a core network element of the second network. When the terminal device indirectly communicates with a core network element of the second network, the terminal device may send a first session handover request to the core network element of the second network through one or more network devices. For example, referring to fig. 2A, the terminal device may send the first session handover request to a core network element of the second network through an access network element of the second network. It is understood that step S201A and step S201B in fig. 2A are step S201 in fig. 2.

It should be noted that fig. 2A illustrates an example in which the second network is a 5G network, the third network is a 4G network, the access network of the second network is a next generation radio access network (NG RAN), the core network of the second network is a 5G core network (5G core network, 5GC), and the first session handover request is a Protocol Data Unit (PDU) handover request. The access network device of the second network may be a gNB, and the core network element of the second network may be an AMF network element in the 5 GC.

It can be understood that, if the second Network is a 4G Network, the Access Network of the second Network may be an Evolved Universal Terrestrial Radio Access Network (EUTRAN), the core Network of the second Network may be a 4G core Network (4G core Network, 4GC), correspondingly, the Access Network device of the second Network may be an Evolved nodeb (eNB), and the core Network element of the second Network may be an MME Network element in the 4G Network; the first session handover request may be a Packet Data Network (PDN) handover request, and is used to request to carry a subsequent service of the terminal device through the 4G Network, which is not limited in this application.

The service of the terminal device may be an IP Multimedia Subsystem (IMS) service, and the IMS service may include a voice or video call service. It should be noted that the service of the terminal device may also be another service that can be borne in the first network, which is not limited in this application.

Step S202, when the access network of the second network cannot carry the subsequent service of the terminal device, the second network may send switching indication information to the terminal device, where the switching indication information is used to indicate that the terminal device is switched from the access network of the second network to the access network of the third network. Correspondingly, the terminal equipment receives the switching indication information.

After receiving the first session switching request, the second network may determine whether the second network can carry subsequent services of the terminal device, and if the second network cannot carry the subsequent services of the terminal device, the second network sends switching indication information to the terminal device; and if the second network can bear the subsequent service of the terminal equipment, transmitting the subsequent service of the terminal equipment through the second network.

In one implementation, the sending, by the second network, the handover indication information to the terminal device may refer to: and the core network element of the second network sends the switching indication information to the terminal equipment.

Likewise, a core network element of the second network may communicate directly or indirectly with the terminal device. When the core network element of the second network indirectly communicates with the terminal device, the core network element of the second network may send the handover indication information to the terminal device through one or more network devices. For example, referring to fig. 2A, a core network element of the second network may send the handover indication information to the terminal device through an access network element of the second network. It is understood that step S202A and step S202B in fig. 2A are steps S202 in fig. 2.

It should be noted that the handover indication information may be a Radio Access Technology (RAT) handover indication, and the RAT handover indication may be used to instruct the terminal device to handover the Access network. In fig. 2A, the handover indication information is described by taking a RAT handover indication as an example.

In an implementation manner, the terminal device may access a third network in a 3GPP manner, where the third network may be a 5G network or a 4G network, and the present application is not limited thereto.

It should be noted that the second network and the third network may be networks of different communication systems, for example: if the second network is a 5G network, the third network may be a 4G network; if the second network is a 4G network, the third network may be a 5G network.

And step S203, the terminal equipment is switched from the access network of the second network to the access network of the third network according to the switching indication information. And under the condition that the terminal equipment is switched from the access network of the second network to the access network of the third network, the subsequent service of the terminal equipment is transmitted through the access network of the third network.

In one implementation, the second network may send a session handover response (e.g., referred to as session handover response 1) to the terminal device. Accordingly, the terminal device may receive the session switching response. After receiving the session handover response, the terminal device indicates that the subsequent service of the terminal device can be transmitted through the access network of the third network and the core network of the second network.

Wherein, when the second network is a 5G network, the session handover response may be a PDU handover response sent by the 5G network, where the PDU handover response is used to indicate that the PDU handover is completed. In fig. 2A, the session handover response 1 is described by taking a PDU handover response as an example.

By implementing the method provided by the embodiment of the application, under the condition that the signal quality of the first network is poor and the access network of the second network cannot bear the subsequent service of the terminal device, the second network switches from the access network of the second network to the access network of the third network according to the switching indication information by sending the switching indication information to the terminal device, so that the subsequent service of the terminal device can be transmitted through the access network of the third network, the continuity of the subsequent service of the terminal device is ensured, and the user experience is improved.

Referring to fig. 3, fig. 3 is a schematic flowchart of another handover method according to an embodiment of the present disclosure. The switching method may be implemented by the terminal device, a core network element of the second network, and a core network element of the third network, or may be implemented by a chip in the terminal device and a chip in the core network element. As shown in fig. 3, the switching method includes, but is not limited to, the following steps S301 to S305.

Step S301, under the condition that the service of the terminal equipment is borne in the first network, the terminal equipment can send a first session switching request to the second network; the first session handover request may be for requesting subsequent traffic for carrying the terminal device over the second network. Accordingly, the second network may receive the first session handoff request.

For example, referring to fig. 3A, in a case that a service of a terminal device is carried in a first network, the terminal device may send a first session handover request to a core network element of a second network through an access network element of the second network. It is understood that step S301A and step S301B in fig. 3A are step S301 in fig. 3.

Fig. 3A illustrates an example in which the second network is a 5G network, the third network is a 4G network, the access network of the second network is an NG RAN, the core network of the second network is a 5GC, and the first session handover request is a PDU handover request.

Step S302, when the access network of the second network cannot carry the subsequent service of the terminal device, the second network may send switching indication information to the terminal device, where the switching indication information is used to indicate that the terminal device is switched from the access network of the second network to the access network of the third network. Correspondingly, the terminal equipment receives the switching indication information.

For example, referring to fig. 3A, in a case that the access network of the second network cannot carry subsequent services of the terminal device, the core network element of the second network may send the handover indication information to the terminal device through the access network element of the second network. In fig. 3A, the handover indication information is described by taking a RAT handover indication as an example. It is understood that step S302A and step S302B in fig. 3A are steps S302 in fig. 3.

It should be noted that step S301 and step S302 are the same as the methods provided in the foregoing embodiments, and specific embodiments and detailed descriptions can be referred to the foregoing contents, which are not described herein again.

Optionally, in step S303, when the access network of the third network cannot be directly connected to the core network of the second network, the core network element of the second network may send a session handover request (for example, referred to as session handover request 1) to the core network element of the third network, where the session handover request may be used to request that the core network of the third network carries a subsequent service of the terminal device.

When the third Network is a 4G Network, the session handover request may be a Packet Data Network (PDN) handover request, where the PDN handover request is used to request that a subsequent service of the terminal device is carried through the 4G Network. In fig. 3A, a session handover request 1 is described by taking a PDN handover request as an example.

And step S304, the terminal equipment is switched from the access network of the second network to the access network of the third network according to the switching indication information, and is switched from the core network of the second network to the core network of the third network.

In the case where the access network of the third network cannot be directly connected to the core network of the second network, the terminal device may perform the handover of the core networks at the same time when performing the handover of the access networks.

Step S305, the core network element of the third network may send a first session switching response to the terminal device, where the first session switching response is used to indicate that the terminal device successfully accesses the core network of the third network; and under the condition that the terminal equipment is successfully accessed to the core network of the third network, the subsequent service of the terminal equipment is transmitted through the core network of the third network. Correspondingly, the terminal equipment receives the first session switching response.

For example, referring to fig. 3A, the core network element of the third network may send the first session handover response to the terminal device through the access network element of the third network. It is understood that step S305A and step S305B in fig. 3A are steps S305 in fig. 3.

When the third network is a 4G network, the first session handover response may be a PDN handover response sent by the 4G network, where the PDN handover response indicates that the PDN handover is completed. In fig. 3A, the first session handover response is illustrated by taking a PDN handover response as an example.

By implementing the method provided by the embodiment of the application, when the access network of the third network cannot be connected to the core network of the second network, the access network of the third network can be accessed, so that the subsequent service of the terminal device is transmitted on the core network of the third network.

Referring to fig. 4, fig. 4 is a schematic flowchart of another handover method according to an embodiment of the present disclosure. The switching method may be implemented by the terminal device, a core network element of the second network, and a core network element of the third network, or may be implemented by a chip in the terminal device and a chip in the core network element. As shown in fig. 4, the switching method includes, but is not limited to, the following steps S401 to S405.

Step S401, under the condition that the service of the terminal equipment is borne in the first network, the terminal equipment can send a first session switching request to the second network; the first session handover request may be for requesting subsequent traffic for carrying the terminal device over the second network. Accordingly, the second network may receive the first session handoff request.

For example, referring to fig. 4A, in a case that a service of a terminal device is carried in a first network, the terminal device may send a first session handover request to a core network element of a second network through an access network element of the second network. It is understood that step S401A and step S401B in fig. 4A are step S401 in fig. 4.

It should be noted that step S401 is the same as the method provided in the foregoing embodiment, and specific embodiments and detailed descriptions can be referred to the foregoing contents, which are not described herein again.

Step S402, in response to the first session handover request, the second network sends a second session handover response to the terminal device, where the second session handover response is used to indicate that the second network cannot carry subsequent services of the terminal device. Accordingly, the terminal device receives a second session handover response from the second network.

For example, referring to fig. 4A, a core network element of the second network may send a second session handover response to the terminal device through an access network element of the second network, where the second session handover response is used to indicate that the second network cannot carry subsequent traffic of the terminal device. In fig. 4A, the second session handover response is illustrated by taking a PDU handover response as an example, where the PDU handover response is used to indicate that the 5G network cannot carry subsequent traffic of the terminal device. It is understood that step S402A and step S402B in fig. 4A are step S402 in fig. 4.

By receiving the second session handover response from the second network, the first session handover request of the terminal device may be rejected through the second session handover response first, and then the access network of the second network is switched to the access network of the third network, and then the access network of the third network is connected to the core network of the third network, so as to complete the handover procedure from the second network to the third network.

Step S403, when the access network of the second network cannot carry the subsequent service of the terminal device, the core network element of the second network may send the handover indication information to the terminal device through the access network element of the second network; the handover indication information is used to indicate that the terminal device is handed over from the access network of the second network to the access network of the third network.

For example, referring to fig. 4A, in a case that the access network of the second network cannot carry subsequent services of the terminal device, the core network element of the second network may send the handover indication information to the terminal device through the access network element of the second network. In fig. 4A, the handover instruction information is described by taking a RAT handover instruction as an example. It is understood that step S403A and step S403B in fig. 4A are step S403 in fig. 4.

And step S404, the terminal device switches from the access network of the second network to the access network of the third network according to the switching indication information, and switches from the core network of the second network to the core network of the third network.

When the terminal device performs the handover of the access network, the terminal device may perform the handover of the core network at the same time. Specifically, the terminal device may initiate the handover procedure of the core network, or the network may directly initiate the handover procedure of the core network, which is not limited in this application. For specific steps of initiating the handover procedure of the core network, reference may be made to the detailed description in the foregoing embodiments, and details are not described herein again.

It should be further noted that step S403 and step S404 are the same as the methods provided in the foregoing embodiments, and specific embodiments and detailed descriptions can be referred to the foregoing contents, which are not described herein again.

Step S405, after the terminal device switches to the access network and the core network of the third network, the terminal device may send a second session switching request to the third network according to the second session switching response; the second session handover request is used to request the access network and the core network of the third network to carry the subsequent service of the terminal device. Accordingly, the third network receives the second session handoff request.

For example, referring to fig. 4A, after the terminal device switches to the access network and the core network of the third network, the terminal device may send a second session switching request to a core network element of the third network through an access network element of the third network. In fig. 4A, the second session handover request is described by taking a PDN handover request as an example, where the PDN handover request is used to request that a subsequent service of the terminal device is carried through the 4G network. It is understood that step S405A and step S405B in fig. 4A are steps S405 in fig. 4.

Step S406, in response to the second session switching request, the third network may send a first session switching response to the terminal device, where the first session switching response is used to indicate that the terminal device successfully accesses the core network of the third network, and the subsequent service of the terminal device is transmitted through the core network of the third network. Correspondingly, the terminal equipment receives the first session switching response.

For example, referring to fig. 4A, in a case that the second session handover is completed, the core network element of the third network may send a first session handover response to the terminal device through the access network element of the third network. In fig. 4A, the first session handover response is illustrated by taking a PDN handover response as an example, and the first session handover response is used to indicate that the PDN handover is completed. It is understood that step S406A and step S406B in fig. 4A are steps S406 in fig. 4.

By sending the second session handover request to the third network, the session handover procedure can be restarted after the terminal device completes handover from the second network to the third network, so that subsequent services of the terminal device are transmitted on the third network, thereby ensuring service continuity.

Referring to fig. 5, fig. 5 is a schematic structural diagram of a communication device according to an embodiment of the present disclosure. The communication device shown in fig. 5 may be used to perform some or all of the functions in the above-described method embodiments. The device may be a terminal device, or a device in the terminal device, or a device capable of being used in cooperation with the terminal device. The communication device shown in fig. 5 may comprise a communication unit 501 and a processing unit 502. The processing unit 502 is configured to perform data processing. The communication unit 501 is integrated with a receiving unit, a transmitting unit, and the like. The communication unit 501 may also be referred to as a transceiving unit. Alternatively, communication section 501 may be divided into a reception section and a transmission section. The processing unit 502 and the communication unit 501 are similar in structure, and are not described in detail below. Wherein, the detailed description of each unit is as follows:

a communication unit 501, configured to send a first session handover request to a second network when a service of a communication device is borne by a first network; the first session handover request may be for requesting subsequent traffic for carrying the communication device over the second network; the communication unit 501 is further configured to receive handover instruction information from the second network, where the handover instruction information is used to instruct the communication device to handover from an access network of the second network to an access network of a third network; the switching indication information is sent by the second network under the condition that the access network of the second network cannot bear the subsequent service of the communication device; the processing unit 502 is configured to switch from the access network of the second network to the access network of the third network according to the switching indication information; in the event that the communication device switches from the access network of the second network to the access network of the third network, subsequent traffic of the communication device is transmitted through the access network of the third network.

In one implementation, the communication unit 501 is further configured to receive a first session handover response from the third network, where the first session handover response is used to indicate that the communication apparatus successfully accesses the core network of the third network; and under the condition that the communication device is successfully accessed to the core network of the third network, the subsequent service of the communication device is transmitted through the core network of the third network.

In one implementation, the communication unit 501 is further configured to receive a second session handover response from the second network, where the second session handover response may be used to indicate that the second network cannot carry subsequent traffic of the communication device.

In an implementation manner, after the communication device is switched to the access network and the core network of the third network, the communication unit 501 is further configured to send a second session switching request to the third network according to the second session switching response; the second session handover request is for requesting a subsequent service of the communication device to be carried through an access network and a core network of the third network.

According to the embodiment of the present application, the units in the communication apparatus shown in fig. 5 may be respectively or entirely combined into one or several other units to form the unit, or some unit(s) therein may be further split into multiple units with smaller functions to form the unit(s), which may achieve the same operation without affecting the achievement of the technical effect of the embodiment of the present application. The units are divided based on logic functions, and in practical application, the functions of one unit can be realized by a plurality of units, or the functions of a plurality of units can be realized by one unit. In other embodiments of the present application, the communication device may also include other units, and in practical applications, the functions may also be implemented by being assisted by other units, and may be implemented by cooperation of a plurality of units.

The communication device may be, for example: a chip, or a chip module. Each module included in each apparatus and product described in the above embodiments may be a software module, a hardware module, or a part of the software module and a part of the hardware module. For example, for each device or product applied to or integrated in a chip, each module included in the device or product may be implemented by hardware such as a circuit, or at least a part of the modules may be implemented by a software program running on a processor integrated in the chip, and the rest (if any) part of the modules may be implemented by hardware such as a circuit; for each device and product applied to or integrated with the chip module, each module included in the device and product may be implemented in a hardware manner such as a circuit, and different modules may be located in the same component (e.g., a chip, a circuit module, etc.) or different components of the chip module, or at least a part of the modules may be implemented in a software program running on a processor integrated within the chip module, and the rest (if any) part of the modules may be implemented in a hardware manner such as a circuit; for each device and product applied to or integrated in the terminal, each module included in the device and product may be implemented by using hardware such as a circuit, different modules may be located in the same component (e.g., a chip, a circuit module, etc.) or different components in the terminal, or at least a part of the modules may be implemented by using a software program running on a processor integrated in the terminal, and the rest (if any) part of the modules may be implemented by using hardware such as a circuit.

The embodiments of the present application and the embodiments of the foregoing method are based on the same concept, and the technical effects thereof are also the same, and for the specific principle, reference is made to the description of the foregoing embodiments, which is not repeated herein.

Referring to fig. 6, fig. 6 is a schematic structural diagram of a communication device according to an embodiment of the present disclosure. The communication device shown in fig. 6 may be used to perform some or all of the functions in the above-described method embodiments. The apparatus may be a core network element of the second network, or an apparatus in the core network element of the second network, or an apparatus capable of being used in match with the core network element of the second network. The communication apparatus shown in fig. 6 may include a communication unit 601 and a processing unit 602. Wherein, the detailed description of each unit is as follows:

the processing unit 602 is configured to invoke the communication unit 601, and receive a first session switching request from the terminal device; the first session switching request is used for requesting a subsequent service of the terminal equipment carried by a second network; the first session switching request is sent by the terminal equipment under the condition that the service of the terminal equipment is borne in the first network; in a case that the access network of the second network cannot carry subsequent services of the terminal device, the communication unit 601 is further configured to send, to the terminal device, handover indication information, where the handover indication information is used to indicate that the terminal device is handed over from the access network of the second network to an access network of a third network.

In an implementation manner, the communication unit 601 is further configured to send a third session handover request to a core network element of a third network, where the third session handover request may be used to request that a subsequent service of the terminal device is carried through an access network and the core network of the third network.

In one implementation manner, the communication unit 601 is further configured to send a second session handover response to the terminal device, where the second session handover response is used to indicate that the second network cannot carry subsequent services of the terminal device.

According to the embodiment of the present application, the unit in the communication apparatus shown in fig. 6 may be configured by one or several additional units, or may be further configured by splitting into a plurality of units with smaller functions, which may achieve the same operation without affecting the achievement of the technical effect of the embodiment of the present application. The units are divided based on logic functions, and in practical application, the functions of one unit can be realized by a plurality of units, or the functions of a plurality of units can be realized by one unit. In other embodiments of the present application, the communication device may also include other units, and in practical applications, the functions may also be implemented by being assisted by other units, and may be implemented by cooperation of a plurality of units.

Referring to fig. 7, fig. 7 is a schematic diagram of a communication device 70 according to an embodiment of the present application, which can be used to implement the functions of the terminal device in the foregoing method embodiments. The communication means may be the aforementioned terminal device or means for a terminal device. The means for the terminal device may be a system of chips or a chip within the terminal device. The chip system may be composed of a chip, or may include a chip and other discrete devices. As shown in fig. 7, the communication device 70 may include a communication interface 701 and a processor 702. Optionally, the communication device may further include a memory 703. The communication interface 701, the processor 702, and the memory 703 may be connected by a bus 704 or by other means. The bus lines are shown in fig. 7 by thick lines, and the connection manner between other components is merely illustrative and not limited thereto. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 7, but this is not intended to represent only one bus or type of bus.

The coupling in the embodiments of the present application is an indirect coupling or a communication connection between devices, units or modules, and may be an electrical, mechanical or other form for information interaction between the devices, units or modules. In the embodiment of the present application, the specific connection medium among the communication interface 701, the processor 702, and the memory 703 is not limited.

Memory 703 may include both read-only memory and random-access memory, and provides instructions and data to processor 702. A portion of the memory 703 may also include non-volatile random access memory.

The Processor 702 may be a Central Processing Unit (CPU), and the Processor 702 may also be other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general-purpose processor may be a microprocessor, but in the alternative, the processor 702 may be any conventional processor or the like. Wherein:

a memory 703 for storing program instructions.

A processor 702 for invoking program instructions stored in memory 703 for:

under the condition that the service of the communication device is borne in the first network, calling a communication interface 701 to send a first session switching request to the second network; the first session handover request may be for requesting subsequent traffic for carrying the communication device over the second network; receiving handover indication information from the second network, the handover indication information being used to indicate that the communication device is handed over from an access network of the second network to an access network of a third network; the switching indication information is sent by the second network under the condition that the access network of the second network cannot bear the subsequent service of the communication device; the processor 702 is further configured to switch from the access network of the second network to the access network of the third network according to the switching indication information; in the event that the communication device switches from the access network of the second network to the access network of the third network, subsequent traffic of the communication device is transmitted through the access network of the third network.

In one implementation, the communication interface 701 is further configured to receive a first session handover response from the third network, where the first session handover response is used to indicate that the communication apparatus successfully accesses the core network of the third network; and under the condition that the communication device is successfully accessed to the core network of the third network, the subsequent service of the communication device is transmitted through the core network of the third network.

In one implementation, the communication interface 701 is further configured to receive a second session handover response from the second network, where the second session handover response may be used to indicate that the second network cannot carry subsequent traffic of the communication device.

In an implementation manner, after the communication device is switched to the access network and the core network of the third network, the communication interface 701 is further configured to send a second session switching request to the third network according to the second session switching response; the second session handover request is for requesting a subsequent service of the communication device to be carried through an access network and a core network of the third network.

It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process and effect of the communication device described in fig. 7 may refer to the corresponding process in the foregoing method embodiment, and are not described herein again.

Referring to fig. 8, fig. 8 is a schematic diagram of a communication device 80 according to an embodiment of the present application, which can be used to implement the functions of the core network element of the second network in the foregoing method embodiments. The communication means may be a core network element of the second network or means for a core network element of the second network. The means for the core network element of the second network may be a system-on-chip or a chip within the core network element of the second network. The chip system may be composed of a chip, or may include a chip and other discrete devices. As shown in fig. 8, the communication device 80 may include a communication interface 801 and a processor 802. Optionally, the communication device may also include a memory 803. The communication interface 801, the processor 802, and the memory 803 may be connected by a bus 804 or otherwise. The bus lines are shown in fig. 8 as thick lines, and the connection between other components is merely illustrative and not intended to be limiting. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 8, but this is not intended to represent only one bus or type of bus.

The coupling in the embodiments of the present application is an indirect coupling or a communication connection between devices, units or modules, and may be an electrical, mechanical or other form for information interaction between the devices, units or modules. The specific connection medium among the communication interface 801, the processor 802 and the memory 803 is not limited in the embodiments of the present application.

The memory 803 may include both read-only memory and random-access memory, and provides instructions and data to the processor 802. A portion of the memory 803 may also include non-volatile random access memory.

The Processor 802 may be a Central Processing Unit (CPU), and the Processor 802 may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, etc. A general purpose processor may be a microprocessor, but in the alternative, the processor 802 may be any conventional processor or the like. Wherein:

a memory 803 for storing program instructions.

A processor 802 for invoking program instructions stored in a memory 803 for:

calling a communication interface 801, and receiving a first session switching request from a terminal device; the first session switching request is used for requesting a subsequent service of the terminal equipment carried by a second network; the first session switching request is sent by the terminal equipment under the condition that the service of the terminal equipment is borne in the first network; and under the condition that the access network of the second network cannot bear the subsequent service of the terminal equipment, sending switching indication information to the terminal equipment, wherein the switching indication information is used for indicating the terminal equipment to be switched from the access network of the second network to the access network of a third network.

In an implementation manner, the communication interface 801 is further configured to send a third session handover request to a core network element of a third network, where the third session handover request may be used to request that a subsequent service of the terminal device is carried through an access network and the core network of the third network.

In one implementation, the communication interface 801 is further configured to send a second session handover response to the terminal device, where the second session handover response is used to indicate that the second network cannot carry subsequent services of the terminal device.

It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process and effect of the communication device described in fig. 8 may refer to the corresponding process in the foregoing method embodiment, and are not described herein again.

In the embodiment of the present application, the method provided by the embodiment of the present application may be implemented by running a computer program (including program codes) capable of executing the steps involved in the above method on a general-purpose computing device such as a computer including a Central Processing Unit (CPU), a random access storage medium (RAM), a read only storage medium (ROM), and the like as well as a storage element. The computer program may be recorded on a computer-readable recording medium, for example, and loaded and executed in the above-described computing apparatus via the computer-readable recording medium.

Based on the same inventive concept, the principle and the advantageous effect of the communication apparatus to solve the problem provided in the embodiment of the present application are similar to the principle and the advantageous effect of the communication apparatus to solve the problem in the embodiment of the method of the present application, and for brevity, the principle and the advantageous effect of the implementation of the method may be referred to, and are not described herein again.

The embodiment of the present application further provides a chip, where the chip may perform relevant steps of the terminal device in the foregoing method embodiment. The chip is used for: for sending a first session handover request to the second network; the first session switching request is used for requesting a subsequent service of the terminal equipment carried by a second network; the first session switching request is sent by the terminal equipment under the condition that the service of the terminal equipment is borne in the first network; receiving switching indication information from the second network, wherein the switching indication information is used for indicating the terminal equipment to be switched from an access network of the second network to an access network of a third network; the switching indication information is sent by the second network under the condition that the access network of the second network can not bear the subsequent service of the terminal equipment; switching from the access network of the second network to the access network of the third network according to the switching indication information; and under the condition that the terminal equipment is switched from the access network of the second network to the access network of the third network, the subsequent service of the terminal equipment is transmitted through the access network of the third network.

In one implementation, the chip is further configured to receive a first session handover response from the third network, where the first session handover response is used to indicate that the terminal device successfully accesses the core network of the third network; and under the condition that the terminal equipment is successfully accessed to the core network of the third network, the subsequent service of the terminal equipment is transmitted through the core network of the third network.

In one implementation, the chip is further configured to receive a second session handover response from the second network, where the second session handover response may be used to indicate that the second network cannot carry subsequent traffic of the terminal device.

In one implementation, after the terminal device is switched to an access network and a core network of a third network, a second session switching request is sent to the third network according to a second session switching response; the second session handover request is used to request the access network and the core network of the third network to carry the subsequent service of the terminal device.

In one implementation, the chip includes at least one processor, at least one first memory, and at least one second memory; the at least one first memory and the at least one processor are interconnected through a line, and instructions are stored in the first memory; the at least one second memory and the at least one processor are interconnected through a line, and the second memory stores the data required to be stored in the method embodiment.

For each device or product applied to or integrated in the chip, each module included in the device or product may be implemented by hardware such as a circuit, or at least a part of the modules may be implemented by a software program running on a processor integrated in the chip, and the rest (if any) part of the modules may be implemented by hardware such as a circuit.

The embodiment of the present application further provides another chip, where the chip may perform the relevant steps of the core network element of the second network in the foregoing method embodiment. The chip is used for: receiving a first session switching request from terminal equipment; the first session switching request is used for requesting a subsequent service of the terminal equipment carried by a second network; the first session switching request is sent by the terminal equipment under the condition that the service of the terminal equipment is borne in the first network; and under the condition that the access network of the second network cannot bear the subsequent service of the terminal equipment, sending switching indication information to the terminal equipment, wherein the switching indication information is used for indicating the terminal equipment to be switched from the access network of the second network to the access network of a third network.

In one implementation, a third session handover request is sent to a core network element of a third network, where the third session handover request may be used to request that a subsequent service of the terminal device is carried through an access network and a core network of the third network.

In one implementation, a second session handover response is sent to the terminal device, where the second session handover response is used to indicate that the second network cannot carry subsequent services of the terminal device.

Referring to fig. 9, fig. 9 is a schematic structural diagram of a module apparatus according to an embodiment of the present disclosure. The module device 90 can perform the steps related to the terminal device in the foregoing method embodiments, and the module device 90 includes: a communication module 901, a power module 902, a memory module 903 and a chip module 904.

The power module 902 is used for providing power for the module device; the storage module 903 is used for storing data and instructions; the communication module 901 is used for performing internal communication of a module device, or for performing communication between the module device and an external device; the chip module 904 is used for:

sending a first session handover request to a second network; the first session switching request is used for requesting a subsequent service of the terminal equipment carried by a second network; the first session switching request is sent by the terminal equipment under the condition that the service of the terminal equipment is borne in the first network; receiving switching indication information from the second network, wherein the switching indication information is used for indicating the terminal equipment to be switched from an access network of the second network to an access network of a third network; the switching indication information is sent by the second network under the condition that the access network of the second network can not bear the subsequent service of the terminal equipment; switching from the access network of the second network to the access network of the third network according to the switching indication information; and under the condition that the terminal equipment is switched from the access network of the second network to the access network of the third network, the subsequent service of the terminal equipment is transmitted through the access network of the third network.

In one implementation, a first session handover response from a third network is received, where the first session handover response is used to indicate that a terminal device successfully accesses a core network of the third network; and under the condition that the terminal equipment is successfully accessed to the core network of the third network, the subsequent service of the terminal equipment is transmitted through the core network of the third network.

In one implementation, a second session handover response from the second network is received, where the second session handover response may be used to indicate that the second network cannot carry subsequent traffic of the terminal device.

For each device and product applied to or integrated in the chip module, each module included in the device and product may be implemented by using hardware such as a circuit, and different modules may be located in the same component (e.g., a chip, a circuit module, etc.) or different components of the chip module, or at least some of the modules may be implemented by using a software program running on a processor integrated in the chip module, and the rest (if any) of the modules may be implemented by using hardware such as a circuit.

Referring to fig. 10, fig. 10 is a schematic structural diagram of another module apparatus according to an embodiment of the present disclosure. The module apparatus 100 may perform the steps related to the core network element of the second network in the foregoing method embodiment, where the module apparatus 100 includes: a communication module 1001, a power module 1002, a memory module 1003, and a chip module 1004.

The power module 1002 is used for providing power for the module device; the storage module 1003 is used for storing data and instructions; the communication module 1001 is used for performing internal communication of a module device, or for performing communication between the module device and an external device; the chip module 1004 is used for:

receiving a first session switching request from terminal equipment; the first session switching request is used for requesting a subsequent service of the terminal equipment carried by a second network; the first session switching request is sent by the terminal equipment under the condition that the service of the terminal equipment is borne in the first network; and under the condition that the access network of the second network cannot bear the subsequent service of the terminal equipment, sending switching indication information to the terminal equipment, wherein the switching indication information is used for indicating the terminal equipment to be switched from the access network of the second network to the access network of a third network.

The embodiment of the present application further provides a computer-readable storage medium, in which one or more instructions are stored, and the one or more instructions are adapted to be loaded by a processor and execute the method provided by the foregoing method embodiment.

Embodiments of the present application also provide a computer program product containing instructions, which when run on a computer, cause the computer to perform the method provided by the above method embodiments.

It should be noted that, for simplicity of description, the above-mentioned embodiments of the method are described as a series of acts or combinations, but those skilled in the art should understand that the present application is not limited by the order of acts described, as some steps may be performed in other orders or simultaneously according to the present application. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required in this application.

The steps in the method of the embodiment of the application can be sequentially adjusted, combined and deleted according to actual needs.

The modules in the device can be merged, divided and deleted according to actual needs.

Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, which may include: flash disks, Read-Only memories (ROMs), Random Access Memories (RAMs), magnetic or optical disks, and the like.

The above disclosure is only one preferred embodiment of the present invention, which is only a part of the present invention, and certainly not intended to limit the scope of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Claims

1. A method of handover, the method comprising:

under the condition that the service of the terminal equipment is borne in a first network, the terminal equipment sends a first session switching request to a second network; the first session switching request is used for requesting to bear the subsequent service of the terminal equipment through the second network;

the terminal equipment receives switching indication information from the second network, wherein the switching indication information is used for indicating the terminal equipment to switch from an access network of the second network to an access network of a third network; the switching indication information is sent by the second network under the condition that an access network of the second network cannot bear the subsequent service of the terminal equipment;

the terminal equipment is switched from the access network of the second network to the access network of the third network according to the switching indication information;

and under the condition that the terminal equipment is switched from the access network of the second network to the access network of the third network, the subsequent service of the terminal equipment is transmitted through the access network of the third network.

2. The method of claim 1, further comprising:

the terminal equipment receives a first session switching response from the third network, wherein the first session switching response is used for indicating that the terminal equipment successfully accesses the core network of the third network;

and under the condition that the terminal equipment is successfully accessed to the core network of the third network, the subsequent service of the terminal equipment is transmitted through the core network of the third network.

3. The method of claim 2, wherein before the terminal device receives the first session handover response from the third network, the method further comprises:

and the terminal equipment receives a second session switching response from the second network, wherein the second session switching response is used for indicating that the second network cannot bear subsequent services of the terminal equipment.

4. The method of claim 3, wherein before the terminal device receives the first session handover response from the third network, the method further comprises:

after the terminal equipment is switched to an access network and a core network of the third network, the terminal equipment sends a second session switching request to the third network according to the second session switching response; the second session handover request is used for requesting to carry subsequent services of the terminal device through an access network and a core network of the third network.

5. The method of any of claims 1 to 4, wherein the first network is a non-3 GPP network and the second and third networks are 3GPP networks.

6. A method of handover, the method comprising:

a core network element of a second network receives a first session switching request from a terminal device; the first session switching request is used for requesting to bear the subsequent service of the terminal equipment through the second network; the first session switching request is sent by the terminal equipment under the condition that the service of the terminal equipment is borne in a first network;

and under the condition that the access network of the second network cannot bear the subsequent service of the terminal equipment, sending switching indication information to the terminal equipment by a core network element of the second network, wherein the switching indication information is used for indicating the terminal equipment to be switched from the access network of the second network to the access network of a third network.

7. The method of claim 6, further comprising:

and the core network element of the second network sends a third session switching request to the core network element of the third network, where the third session switching request is used to request that the subsequent service of the terminal device is carried through the access network and the core network of the third network.

8. The method of claim 6, further comprising:

and the core network element of the second network sends a second session switching response to the terminal equipment, wherein the second session switching response is used for indicating that the second network cannot bear subsequent services of the terminal equipment.

9. A communication apparatus comprising means for performing the method of any of claims 1-8.

10. A communications apparatus, comprising a processor;

the processor is used for executing the method of any one of claims 1-8.

11. The communications apparatus of claim 10, the communications apparatus further comprising a memory:

the memory for storing a computer program;

the processor, in particular for calling the computer program from the memory, to perform the method according to any one of claims 1 to 8.

12. A chip, characterized in that,

the chip is used for sending a first session switching request to a second network; the first session switching request is used for requesting a subsequent service of the terminal equipment carried by the second network; the first session switching request is sent by the terminal equipment under the condition that the service of the terminal equipment is borne in a first network;

receiving switching indication information from the second network, wherein the switching indication information is used for indicating the terminal equipment to switch from an access network of the second network to an access network of a third network; the switching indication information is sent by the second network under the condition that an access network of the second network cannot bear the subsequent service of the terminal equipment;

switching from the access network of the second network to the access network of the third network according to the switching indication information;

13. A chip, characterized in that,

the chip is used for receiving a first session switching request from the terminal equipment; the first session switching request is used for requesting to bear the subsequent service of the terminal equipment through a second network; the first session switching request is sent by the terminal equipment under the condition that the service of the terminal equipment is borne in a first network;

and sending switching indication information to the terminal equipment under the condition that the access network of the second network cannot bear the subsequent service of the terminal equipment, wherein the switching indication information is used for indicating the terminal equipment to be switched from the access network of the second network to the access network of a third network.

14. The utility model provides a module equipment, its characterized in that, module equipment includes communication module, power module, storage module and chip module, wherein:

the power supply module is used for providing electric energy for the module equipment;

the storage module is used for storing data and instructions;

the communication module is used for carrying out internal communication of module equipment or is used for carrying out communication between the module equipment and external equipment;

the chip module is used for:

sending a first session handover request to a second network; the first session switching request is used for requesting a subsequent service of the terminal equipment carried by the second network; the first session switching request is sent by the terminal equipment under the condition that the service of the terminal equipment is borne in a first network;

15. The utility model provides a module equipment, its characterized in that, module equipment includes communication module, power module, storage module and chip module, wherein:

the storage module is used for storing data and instructions;

the chip module is used for:

receiving a first session switching request from terminal equipment; the first session switching request is used for requesting to bear the subsequent service of the terminal equipment through a second network; the first session switching request is sent by the terminal equipment under the condition that the service of the terminal equipment is borne in a first network;