CN115967995A

CN115967995A - Cell switching method and device

Info

Publication number: CN115967995A
Application number: CN202111178190.2A
Authority: CN
Inventors: 韩立锋
Original assignee: Spreadtrum Communications Shanghai Co Ltd
Current assignee: Spreadtrum Communications Shanghai Co Ltd
Priority date: 2021-10-09
Filing date: 2021-10-09
Publication date: 2023-04-14

Abstract

The embodiment of the application provides a cell switching method and a device, wherein the method comprises the following steps: a first network device sends a first message to a second network device, wherein the first message is used for requesting to switch a first terminal device to a target cell in the second network device, the first message comprises backup information, the backup information comprises first indication information, and the first indication information is used for indicating that the first terminal device is configured with the backup terminal device; the first network device receives a response message from the second network device. The method provided by the embodiment of the application effectively provides the reliability of data transmission.

Description

Cell switching method and device

Technical Field

The present application relates to the field of communications technologies, and in particular, to a cell switching method and apparatus.

Background

In a wireless communication system, when a terminal device moves from one cell (which refers to a base station or the coverage area of a base station) to another cell, a cell handover is required in order to maintain uninterrupted communication of the terminal device service.

Meanwhile, for the main terminal device bearing the backup service, one or more backup terminal devices may exist in the main terminal device, so that backup is realized, and the reliability of data transmission is improved.

Therefore, how to maintain the reliability of data transmission of the terminal equipment needs to be solved when the terminal equipment performs cell switching.

Disclosure of Invention

The embodiment of the application provides a cell switching method and a cell switching device, which effectively improve the reliability of data transmission.

In a first aspect, an embodiment of the present application provides a cell handover method, where the method includes:

a first network device sends a first message to a second network device, wherein the first message is used for requesting to switch a first terminal device to a target cell in the second network device, the first message comprises backup information, the backup information comprises first indication information, and the first indication information is used for indicating that the first terminal device is configured with a backup terminal device; the first network device receives a response message from the second network device.

In this embodiment, the first network device may be understood as a source base station or a base station to which a source cell belongs, and the second network device may be understood as a target base station or a base station to which a target cell belongs.

In the embodiment of the application, the first terminal equipment is considered to be configured with the backup terminal equipment in the handover preparation process, so that the handover preparation can be better carried out in the target cell, and the handover with better performance is realized. If the first terminal equipment is switched to the target cell, the backup terminal equipment can still be kept, so that the reliability of data transmission is improved, and the data transmission rate can also be improved.

In a possible implementation manner, the backup information further includes role information of the first terminal device, and the role information of the first terminal device includes a main terminal device.

In a possible implementation manner, the first indication information is further used to indicate that backup terminal devices are configured for the first terminal device according to different services.

In one possible implementation, the response message includes any one of:

a second message, where the second message is used to indicate that handover preparation fails, where the second message carries a reason for the handover preparation failure, and the reason for the handover preparation failure includes that a backup terminal device fails to be configured for the first terminal device;

a third message, where the third message is used to indicate that a handover preparation is successful, and the third message carries indication information indicating that configuring a backup terminal device for the first terminal device fails;

in a possible implementation manner, the third message further carries a service identifier indicating that the configuration of the backup terminal device for the first terminal device fails.

In a possible implementation manner, before the first network device sends the first message to the second network device, the method further includes:

receiving a seventh message reported by the first terminal device, wherein the seventh message carries cell information of the backup terminal device;

and determining a target cell switched by the first terminal equipment according to the cell information.

In a possible implementation manner, before receiving the cell information of the backup terminal device, which is reported by the first terminal device, the method further includes:

and sending an eighth message to the first terminal device, where the eighth message is used to trigger the first terminal device to report the cell information.

In a possible implementation manner, the eighth message carries second indication information, where the second indication information is used to indicate that the first terminal device reports a measurement result of a cell where a backup terminal device exists.

In a possible implementation manner, the backup information further includes role information of the first terminal device, and the role information of the first terminal device includes the backup terminal device.

In one possible implementation, the method further includes:

and the first network equipment sends a fourth message to the second terminal equipment, wherein the fourth message is used for informing the second terminal equipment that the backup terminal equipment of the second terminal equipment needs to carry out cell switching.

In one possible implementation, the method further includes:

the first network equipment configures backup terminal equipment for the second terminal equipment;

and the first network equipment sends a sixth message to the second terminal equipment, wherein the sixth message comprises the configured identifier of the backup terminal equipment.

In a second aspect, an embodiment of the present application provides a cell handover method, where the method includes:

the method comprises the steps that a second network device receives a first message from a first network device, wherein the first message is used for requesting to switch a first terminal device to a target cell in the second network device, the first message comprises backup information, the backup information comprises first indication information, and the first indication information is used for indicating that the first terminal device is configured with a backup terminal device;

and the second network equipment performs switching preparation according to the backup information and sends a response message to the first network equipment.

In a possible implementation manner, the backup information further includes role information of the first terminal device, and the role information of the first terminal device includes a master terminal device.

In a possible implementation manner, the first indication information is further used to indicate that backup terminal devices are respectively configured for the first terminal device according to different services.

In one possible implementation, the response message includes any one of:

a second message, where the second message is used to indicate that a handover preparation fails, and the second message carries a reason for the handover preparation failure, where the reason for the handover preparation failure includes a failure to configure a backup terminal device for the first terminal device;

a third message, where the third message is used to indicate that the handover preparation is successful, and the third message carries indication information that the configuration of the backup terminal device for the first terminal device is failed;

In one possible implementation, the service identifier includes any one or more of the following:

an identification of a protocol data unit, PDU, session, an identification of a quality of service, qoS, flow, an identification of a data radio bearer, DRB.

In a third aspect, an embodiment of the present application provides a cell handover method, where the method includes:

the first terminal device receives an eighth message from the first network device, wherein the eighth message is used for triggering the first terminal device to report the cell information;

and the first terminal equipment reports a seventh message to the first network equipment, wherein the seventh message carries the cell information of the backup terminal equipment.

In a fourth aspect, an embodiment of the present application provides a cell handover method, where the method includes:

the second terminal device receives a fourth message from the first network device, where the fourth message is used to notify the second terminal device that its backup terminal device needs to perform cell switching.

In one possible implementation, the method further includes:

the second terminal device sends a discovery signal, wherein the discovery signal is used for discovering the backup terminal device;

and the second terminal equipment receives a fifth message from the backup terminal equipment, wherein the fifth message is used for confirming the backup terminal equipment.

In one possible implementation, the method further includes:

and the second terminal equipment receives a sixth message from the first network equipment, wherein the sixth message comprises the configured identifier of the backup terminal equipment.

In a fifth aspect, an embodiment of the present application provides a communication apparatus, which includes means for implementing the method in the first aspect, the second aspect, the third aspect, or the fourth aspect, or any possible implementation manner thereof.

In a sixth aspect, embodiments of the present application provide a communication device, which includes a processor and a memory, the processor and the memory being connected to each other, the memory being used for storing a computer program, the computer program including program instructions, the processor being configured to invoke the program instructions to perform the method according to the first aspect, or to perform the method according to the second aspect, or to perform the method according to the third aspect, or to perform the method according to the fourth aspect.

In a seventh aspect, an embodiment of the present application provides a chip, where the chip includes a processor and an interface, where the processor and the interface are coupled; the interface is adapted to receive or output signals and the processor is adapted to execute code instructions to perform a method according to the first aspect, or to perform a method according to the second aspect, or to perform a method according to the third aspect, or to perform a method according to the fourth aspect.

In an eighth aspect, an embodiment of the present application provides a module device, where the module device includes a communication module, a power module, a storage module, and a chip module, where: 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; the chip module is configured to perform the method according to the first aspect, or perform the method according to the second aspect, or perform the method according to the third aspect, or perform the method according to the fourth aspect.

In a ninth aspect, embodiments of the present application provide a computer-readable storage medium storing a computer program comprising program instructions that, when executed by a processor, cause the processor to perform the method according to the first aspect, or perform the method according to the second aspect, or perform the method according to the third aspect, or perform the method according to the fourth aspect.

In a tenth aspect, embodiments of the present application provide a computer program product comprising program instructions that, when executed by a processor, cause the processor to perform the method according to the first aspect, or perform the method according to the second aspect, or perform the method according to the third aspect, or perform the method according to the fourth aspect.

In an eleventh aspect, an embodiment of the present application provides a communication system, where the communication system includes a first network device and a second network device, the first network device is configured to perform the method in the first aspect, and the second network device is configured to perform the method in the second aspect.

In a possible implementation manner, the communication system further includes a first terminal device, and the first terminal device is configured to execute the method according to the third aspect.

In a possible implementation manner, the communication system further includes a second terminal device, and the second terminal device is configured to execute the method according to the fourth aspect.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the background art of the present application, the drawings used in the embodiments or the background art of the present application will be briefly described below.

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

Fig. 2 is a flowchart illustrating a cell handover method according to an embodiment of the present application;

fig. 3 is a flowchart illustrating another cell handover method according to an embodiment of the present application;

fig. 4 is a flowchart illustrating another cell handover method according to an 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 provided in an embodiment of the present application;

fig. 7 is a schematic structural diagram of a module apparatus according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described with reference to the accompanying drawings.

The terms "first" and "second," and the like in the description, claims, and drawings of the present application are used only for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. Such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements recited, but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those skilled in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In this application, "at least one" means one or more, "a plurality" means two or more, "at least two" means two or three and three or more, "and/or" for describing an association relationship of associated objects, which means that there may be three relationships, for example, "a and/or B" may mean: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b," a and c, "" b and c, "or" a and b and c.

First, terms related to the present application will be explained.

1. Terminal device

The terminal device in the embodiment of the present application is a device having a wireless communication function, and may be referred to as a terminal (terminal), a User Equipment (UE), a Mobile Station (MS), a Mobile Terminal (MT), an access terminal device, a vehicle-mounted terminal device, an industrial control terminal device, a UE unit, a UE station, a mobile station, a remote terminal device, a mobile device, a UE terminal device, a wireless communication device, a UE agent, or a UE apparatus. The terminal device may be fixed or mobile. It should be noted that the terminal device may support at least one wireless communication technology, such as LTE, new Radio (NR), and the like. For example, the terminal device may be a mobile phone (mobile phone), a tablet (pad), a desktop, a notebook, a kiosk, a vehicle-mounted terminal, 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, a wireless terminal in remote surgery (remote management), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety, a wireless terminal in city (city), a wireless terminal in smart home (smart home), a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a wireless local loop (wireless local, local) phone, a wireless personal station (wldi), a wireless terminal with a function of being connected to a wireless network, a mobile phone with a function, a wireless communication network, a wireless communication terminal with a function in future, a mobile communication terminal with a Public Land Mobile Network (PLMN), or other mobile network, a mobile communication device with a function, a wireless network, a wireless communication terminal with a function in future, or a mobile network. In some embodiments of the present application, the terminal device may also be an apparatus having a transceiving function, such as a system-on-chip. The chip system may include a chip and may also include other discrete devices.

2. Access network device

In the embodiment of the present application, the access network device is a device that provides a wireless communication function for the terminal device, and may also be referred to as a Radio Access Network (RAN) device or an access network element. The access network device may support at least one wireless communication technology, such as LTE, NR, etc., among others. By way of example, access network devices include, but are not limited to: a next generation base station (generation node B, gNB), evolved node B (eNB), radio Network Controller (RNC), node B (NB), base Station Controller (BSC), base Transceiver Station (BTS), home base station (e.g., home evolved node B or home node B, HNB), base Band Unit (BBU), transceiving point (TRP), transmitting Point (TP), mobile switching center, etc., in a fifth generation mobile communication system (5 th-generation, 5G). The network device may also be a wireless controller, a Centralized Unit (CU), and/or a Distributed Unit (DU) in a Cloud Radio Access Network (CRAN) scenario, or the access network device may be a relay station, an access point, a vehicle-mounted device, a terminal device, a wearable device, and an access network device in future mobile communication or an access network device in a PLMN for future evolution, and the like. In some embodiments, the access network device may also be an apparatus, such as a system-on-a-chip, that provides wireless communication functionality for the end device. For example, a system of chips may include chips and may include other discrete devices.

In some embodiments, the access network device may also communicate with an Internet Protocol (IP) network, such as the Internet (Internet), a private IP network, or other data network.

3. Core network

The core network in the embodiment of the application is composed of core network elements. The core network element may also be referred to as a core network device, and is a network element deployed in a core network, such as a core network control plane network element or a core network user plane network element. The core network in the embodiment of the present application may be an Evolved Packet Core (EPC), a 5G core network (5G core network), or may be a new core network in a future communication system. For example, a 5G core network is composed of a set of network elements, and implements access and mobility management functions (AMF) for functions such as mobility management, a User Plane Function (UPF) for providing functions such as packet routing and forwarding and quality of service (QoS) management, a Session Management Function (SMF) for providing functions such as session management, IP address allocation and management, and the like. The EPC may be composed of a Mobility Management Entity (MME) providing functions such as mobility management and gateway selection, a serving gateway (S-GW) providing functions such as packet forwarding, and a PDN gateway (P-GW) providing functions such as terminal address allocation and rate control. For Multicast Broadcast Service (MBS), the core network may include several new network elements to implement functions such as packet forwarding, MBS conference management, qoS management, and transmission mode switching (switching between unicast and multicast/broadcast transmission modes). Alternatively, the functions may be implemented by existing core network elements.

4. Uplink communication

In the embodiment of the present application, uplink communication may also be referred to as uplink transmission, which refers to unidirectional communication from a terminal device to an access network device, where a communication link for uplink communication is an uplink. The data transmitted on the uplink is uplink data. The transmission direction of the uplink data is the uplink direction. For example, the message sent by the first terminal device to the first network device is uplink data.

5. Downlink communication

In this embodiment of the present application, downlink communication may also be referred to as downlink transmission, which refers to unidirectional communication from an access network device to a terminal device, where a communication link used for the downlink communication is a downlink. The data transmitted on the downlink is downlink data. The transmission direction of the downlink data is the downlink direction. Illustratively, the message sent by the first network device to the first terminal device is downlink data.

6. Hot backup

The hot backup referred to in this application can be understood as: and the main terminal equipment and the backup terminal equipment transmit the data of the same service. The hot backup service can be understood as follows: the hot backup is carried out on the service which needs hot backup, and the robustness of service data transmission is improved through the hot backup.

The main terminal device related to the present application can be understood as: the main terminal device carrying the hot backup service performs service data transmission, such as a terminal device receiving or sending data. And backup transmission refers to transmission through backup terminal equipment. The backup terminal device related to the present application may be understood as: and the terminal equipment can perform backup transmission on the hot backup service of the main equipment. Illustratively, the backup terminal device and the main terminal device are in a hot backup relationship, and both devices can transmit the same data packet of the same task/service. For example, the backup terminal device and the main terminal device may transmit different data packets of the same task/service, so as to increase the uplink and downlink data rates, and in this scenario, a cooperative relationship may also be defined between the main terminal device and the backup terminal device. It is understood that the present application is not limited to whether the same data packet is transmitted between the main terminal device and the backup terminal device.

Fig. 1 is a schematic architecture diagram of a communication system according to an embodiment of the present application. As shown in fig. 1, the communication system includes one or more terminal devices, one or more access network devices. Optionally, the communication system may further include one or more core network devices.

Illustratively, the interface between the terminal device and the access network device is an air interface, and a terminal device may be coupled to one or more access network devices. One access network device can connect and manage a plurality of terminal devices. The access network equipment and the access network equipment have an interface, which may be an X2 interface (such as an X2 interface in a 4G system), an Xn interface (such as an Xn interface in a 5G system), or other types of interfaces. An interface exists between the access network device and the core network device, and the interface can be an S1 interface (such as an S1 interface in a 4G system), an NG interface (such as an NG interface in a 5G system), and the like.

It is understood that reference is made to the above for the description of the terminal device, the access network device and the core network device, which are not described in detail here. It is understood that the access network device and the core network device are collectively referred to as a network device hereinafter. For example, a first network device shown below may also be referred to as a first access network device, a second network device may also be referred to as a second access network device, and the like.

The technical scheme of the application can be suitable for a third generation mobile communication (3 th generation, 3G) system, a fourth generation mobile communication (45th generation, 4G) system, a fifth generation mobile communication (5th generation, 5G) system, a New Radio (NR) system, a sixth generation mobile communication (6 th generation, 6G) system or other future communication systems.

The solution of the present application may also be applied to different network architectures, including but not limited to a terrestrial communication network architecture, a non-terrestrial communication network architecture, a relay network architecture, a dual-link architecture, a vehicle-to-eventing architecture, etc.

Generally, for a main terminal device carrying a hot backup service, there are one or more backup terminal devices, and the one or more backup terminal devices and the main terminal device may exist in the same cell, thereby implementing hot backup, improving reliability of data transmission, and also improving data rate. However, when the primary device moves (for example, it can also be understood as performing cell handover), if the primary terminal device moves to a new cell, and if there is no backup terminal device in the target cell, there is no backup terminal device to perform backup when hot backup needs to be performed. Therefore, the packet loss rate may not meet the requirement during the service data transmission, thereby affecting the user experience.

In view of this, embodiments of the present application provide a cell switching method and apparatus, which can effectively solve the problem that when a main terminal device switches a cell, there is no backup terminal device, improve robustness and reliability of data transmission, and also improve a data rate. For example, for a main terminal device carrying a hot backup service, the hot backup can be still maintained during moving, and the robustness of service data transmission is effectively improved.

Fig. 2 is a schematic flowchart of a cell handover method provided in an embodiment of the present application, and as shown in fig. 2, the method includes:

in one possible implementation, the method shown in fig. 2 includes step 201.

201. The first network device determines to handover the first terminal device to the target cell.

In this embodiment of the present application, the first network device may be understood as a first access network device, a source base station, or a base station to which a source cell belongs, and a specific name of the first network device is not limited in this embodiment of the present application. The source base station refers to a source base station for handover, and for example, when handover does not occur, the source base station is a serving base station of the first terminal device. The first terminal device may be understood as a master terminal device, and reference may be made to the above for a description of the master terminal device and the like, which is not described in detail here.

For example, if the Reference Signal Receiving Power (RSRP) of the cell in which the first terminal device is located is lower than a certain threshold (e.g. threshold 1), and/or the Reference Signal Receiving Power (RSRP) of the target cell measured by the first terminal device is higher than a certain threshold (e.g. threshold 2), the first network device may determine that the first terminal device needs to perform cell handover. Also for example, if the Reference Signal Receiving Quality (RSRQ) of the first terminal device is below a certain threshold (e.g., threshold 3) and/or the Reference Signal Receiving Quality (RSRQ) of the target cell measured by the first terminal device is above a certain threshold (e.g., threshold 4), then the first network device may determine that the first terminal device needs to perform handover. The embodiment of the present application does not limit a specific method for determining, by a first network device, that a first terminal device performs cell handover. It will be appreciated that the threshold 1 and threshold 2 shown above may be the same or different; similarly, the threshold 3 and the threshold 4 shown above may be the same or different, and the embodiment of the present application is not limited to this.

It is understood that the step 201 can also be understood as: the first network device decides (or decides) to handover the first terminal device to the target cell.

202. The first network device sends a first message to a second network device, wherein the first message is used for requesting to switch a first terminal device to a target cell in the second network device, the first message comprises backup information, the backup information comprises first indication information, and the first indication information is used for indicating that the backup terminal device is configured for the first terminal device.

Correspondingly, the second network device receives the first message.

In this embodiment of the present application, the second network device may be understood as a second access network device, a target base station, or a base station to which a target cell belongs, and a specific name of the second network device is not limited in this embodiment of the present application. For example, the first network device may send a first message of a handover request to the second network device, requesting to handover the first terminal device to the target cell.

The first indication information may also be understood as an indication that a backup terminal device needs to be configured for the first terminal device. For example, the first indication information may indicate that the first terminal device needs to have a paired backup terminal device. Optionally, the first indication information may also be used to indicate that the backup terminal devices are configured for the first terminal device according to different services. That is, the first indication information is used to indicate that the backup terminal device needs to be configured for the first terminal device according to different services. For example, the first indication information may be used to indicate that different services that need to be hot backed up configure the backup terminal device for the first terminal device. Optionally, the first indication information may further indicate whether each PDU session (PDU session), qoS flow (QoS flow), data Radio Bearer (DRB), or the like needs to configure the backup user equipment. It is understood that the service shown above is only an example, and the embodiment of the present application is not limited to the type of the service.

Optionally, the backup information further includes role information of the first terminal device. For example, the role information of the first terminal device includes a primary terminal device (also referred to as a primary user device, etc.) or a backup terminal device (also referred to as a backup user device, etc.). The role information may also be understood as the identity of the first terminal device, for example, the identity of the first terminal device may be a backup terminal device or a master terminal device. Optionally, the role information of the first terminal device may also indicate the role information for the first terminal device according to different services, for example, the role of the first terminal device may be indicated according to each PDU session, qoS flow, DRB, and the like. For example, for a certain PDU session service, the role of the first terminal device is the master terminal device. For another example, for a certain QoS flow service, the role of the first terminal device is a master terminal device, and the like, which is not described in detail herein. It is understood that the roles of different services may be the same or different, and the embodiments of the present application are not limited.

203. And the second network equipment performs switching preparation according to the backup information.

Illustratively, the second network device receives the first message and performs handover preparation based on the backup information. If the first message includes an indication that the backup terminal device needs to be configured or the role of the first terminal device is the master terminal device, the second network device configures the backup terminal device for the first terminal device.

For example, if the configuration of the backup terminal device in the target cell fails, for example, there is no corresponding backup terminal device or the configuration is unsuccessful, the handover preparation may be considered as a failure.

It can be understood that, if the role information of the first terminal device is the backup terminal device, the second network device does not need to configure the backup terminal device for the first terminal device, that is, the second network device may not perform the process of configuring the backup terminal device. In this case, if other handover preparation conditions, such as resource allocation, are satisfied, the second network device may directly send a handover request confirmation message to the first network device, and the like, which is not limited in the embodiment of the present application.

204. The second network device sends a response message to the first network device. Correspondingly, the first network device receives the response message.

Illustratively, the response message includes a second message indicating a handover preparation failure. For example, if the second network device fails to configure the backup terminal device for the first terminal device, the second network device may be considered as a failure in handover preparation, and thus sends the second message. Optionally, the second message carries a reason for the handover failure, where the reason for the handover failure includes that the configuration of the backup terminal device for the first terminal device fails.

Illustratively, the response message includes a third message indicating that the handover preparation was successful. Optionally, the third message carries indication information indicating that configuring the backup terminal device for the first terminal device fails. That is, when other conditions such as the second network device allocating resources to the first terminal device are satisfied, the second network device may send a third message of the handover request acknowledgement to the first network device, where the third message includes an indication that the corresponding backup terminal device has failed to be configured.

Optionally, the third message further carries a service identifier indicating that the configuration of the backup terminal device for the first terminal device fails. For example, the third message may also carry any one or more of an identifier of a PDU session, an identifier of a QoS flow, or an identifier of a DRB. Optionally, the third message may further carry a failure reason, for example, the failure reason is that the configuration of the backup terminal device fails. Optionally, if the configuration of the backup terminal device of all services (such as PDU session, qoS flow, DRB, or the like) fails, the response message may include a second message (that is, the second message may be sent), where the second message carries a failure reason, and the failure reason may be that the configuration of the backup terminal device fails.

Illustratively, the first message shown in the embodiments of the present application includes, but is not limited to, a HANDOVER REQUEST message, such as HANDOVER REQUEST, HANDOVER REQUEST; the second message includes but is not limited to HANDOVER PREPARATION FAILURE (HANDOVER FAILURE) message, HANDOVER FAILURE (HANDOVER FAILURE) message; the third message includes, but is not limited to, a HANDOVER REQUEST ACKNOWLEDGE (HANDOVER REQUEST ACKNOWLEDGE) message.

In the embodiment of the application, the backup terminal device is considered to be configured for the first terminal device in the handover preparation process of the first terminal device, so that the handover preparation can be better performed in the target cell, and the handover with better performance is realized. If the first terminal device is switched to the target cell, the backup terminal device can still be maintained, so that the reliability of data transmission is improved, and the data transmission rate can also be improved.

Fig. 3 is a schematic flowchart of another cell handover method provided in an embodiment of the present application, and as shown in fig. 3, the method includes:

301. and the first network equipment sends an eighth message to the first terminal equipment, wherein the eighth message is used for triggering the first terminal equipment to report the cell information of the backup terminal equipment.

Correspondingly, the first terminal device receives the eighth message. Optionally, the eighth message carries second indication information, where the second indication information is used to indicate that the first terminal device reports a measurement result of a cell where the backup terminal device exists. That is to say, the eighth message carries an indication that the first terminal device reports the cell information of the backup terminal device, that is, the indication indicates that the first terminal device needs to report the cell information of the backup terminal device according to the eighth message. It can be understood that the role of the first terminal device shown in the embodiment of the present application is a main terminal device.

302. And the first terminal equipment sends a seventh message to the first network equipment, wherein the seventh message carries the cell information of the backup terminal equipment.

Correspondingly, the first network device receives the seventh message.

For example, the first terminal device may report, to the first network device, cell information where the backup terminal device is located, for example, the cell information may be reported through a seventh message. For example, the seventh message may be Radio Resource Control (RRC) signaling, media Access Control (MAC) element (MAC CE) signaling, downlink Control Information (DCI), or the like, which is not limited in this embodiment of the present invention. For example, the seventh message may also carry a cell identity (cell ID) where one or more backup terminal devices are located.

Optionally, when the eighth message may indicate that the first terminal device reports the measurement result, the measurement result of the cell where the backup terminal device exists is reported. Thereby indicating in the seventh message that the cell of the backup terminal device is present. If the first terminal device reports the measurement report, the reported cell measurement result indicates the cell with the backup terminal device. Optionally, when reporting the measurement report, the first terminal device only reports the measurement result of the cell in which the backup terminal device exists. That is, only the measurement result of the cell having the backup terminal device is reported in the seventh message.

Optionally, in the measurement configuration in the ninth message sent by the source base station to the main terminal device, the measured target cell may only include the cell of the backup terminal device.

Further, the measurement configuration in the ninth message sent by the source base station to the master terminal device includes an indication that only the cell of the backup terminal device is measured.

303. And the first network equipment determines to switch the first terminal equipment to the target cell according to the seventh message.

For example, the source base station may select a suitable target cell for the primary terminal device according to the received cell identifier where the backup terminal device is located, which is reported by the first terminal device. That is to say, when the main terminal device performs cell switching, the main terminal device can be switched to a cell with a backup terminal device as much as possible, thereby ensuring the reliability of service data transmission.

In the measuring process, only the cell of the backup terminal device is measured or reported, so that the measuring target and the reported information of the terminal device can be reduced, and the power saving performance of the terminal device can be improved. And when the first network device selects the target cell of the first terminal device, a more appropriate cell can be selected, so that the mobility performance is improved, and the service requirement is met.

In one possible implementation, the method shown in fig. 3 further includes steps 304-306.

304. The first network device sends a first message to a second network device, wherein the first message is used for requesting to switch a first terminal device to a target cell in the second network device, the first message comprises backup information, the backup information comprises first indication information, and the first indication information is used for indicating that the backup terminal device is configured for the first terminal device.

305. And the second network equipment performs switching preparation according to the backup information.

306. The second network device sends a response message to the first network device. Correspondingly, the first network device receives the response message.

It is understood that the detailed description of step 304 to step 306 may refer to the method shown in fig. 2, and will not be described in detail here.

In the embodiment of the application, the first terminal equipment is considered to be configured with the backup terminal equipment in the handover preparation process, so that the handover preparation can be better carried out in the target cell, and the handover with better performance is realized. If the first terminal device is switched to the target cell, the backup terminal device can still be maintained, so that the reliability of data transmission is improved, and the data transmission rate can also be improved.

Fig. 4 is a flowchart illustrating another cell handover method according to an embodiment of the present application, and as shown in fig. 4, the method includes:

401. and the first network equipment sends a fourth message to the second terminal equipment, wherein the fourth message is used for informing the second terminal equipment that the backup terminal equipment of the second terminal equipment needs to carry out cell switching.

Correspondingly, the second terminal device receives the fourth message.

In this embodiment, the second terminal device may be understood as a master terminal device. For example, if the backup terminal device needs to be handed over from the source base station to the target base station, the source base station (which may also be the serving base station of the primary terminal device) sends a fourth message to the primary terminal device (i.e., the second terminal device), so as to notify the primary terminal device that there is a departure of the backup terminal device. Illustratively, the fourth message may be RRC signaling, MAC CE signaling, DCI, or the like. For example, the fourth message includes an identifier of the backup terminal device, where the identifier of the terminal device may be an identifier allocated by a base station or a core network device, and the identifier of the backup terminal device is not limited in this embodiment of the application.

For example, the master terminal device may trigger the searching or configuring method of its backup terminal device when receiving the fourth message. It can be understood that, in the embodiment of the present application, the method for searching or configuring the backup terminal device is not limited. The methods shown in steps 402 and 403 shown below are merely examples.

402. The second terminal device transmits a discovery signal for discovering the backup terminal device.

For example, the second terminal device sends a discovery signal, and after receiving the discovery signal, the third terminal device may send a fifth message to the second terminal device, where the fifth message is used to confirm that the third terminal device may serve as a backup terminal device.

403. And the first network equipment sends a sixth message to the second terminal equipment, wherein the sixth message comprises the configured identifier of the backup terminal equipment.

Correspondingly, the second terminal device receives the sixth message.

For example, the source base station may configure the backup terminal device for the primary terminal device. The sixth message may be RRC signaling, MAC CE signaling, or DCI. For example, the sixth message includes an identifier of the configured backup terminal device.

It is understood that, after receiving the sixth message, the second terminal device may store the identifier of the backup terminal device according to the sixth message, and configure the backup terminal device. Specifically, the second terminal device includes backup configuration information indicating a backup terminal device identifier for a certain service. Further, the backup configuration information may further include a DRB (data radio bearer) identifier for carrying the same service.

Optionally, the first network device may configure the backup terminal device for the second terminal device according to the backup terminal device information sent by the core network device. For example, the backup terminal device information may include information of one or more backup terminal devices. For example, the source base station receives backup terminal device information about the primary terminal device from the core network device, so that the source base station may select one or more backup terminal devices. For example, the backup terminal device information may be an identifier of a group of backup terminal devices, may be an identifier representing a group of terminal devices in a list form, or an identifier of each backup terminal device in one or more backup terminal devices, and the like, which is not limited in this embodiment of the present application.

In the embodiment of the application, the master terminal device can rapidly configure the backup terminal device through the notification or configuration of the source base station, so that the transmission reliability or the data rate of the service is improved.

Fig. 5 is a schematic structural diagram of a communication device according to an embodiment of the present application. The apparatus may be a network device, an apparatus in a network device, or an apparatus capable of being used with a network device. The communication device 500 shown in fig. 5 may comprise a processing unit 501 and a communication unit 502. The processing unit 501 is configured to perform data processing. The communication unit 502 may be integrated with a receiving unit and a transmitting unit. The communication unit 502 may also be referred to as a transceiving unit. Alternatively, communication section 502 may be divided into a reception section and a transmission section. The processing unit 501 and the communication unit 502 are the same, and are not described in detail below.

In some embodiments of the present application, when the communication apparatus is configured to perform a post-step function performed by a first network device, the communication unit 502 is configured to send a first message to a second network device, where the first message is used to request that a first terminal device is handed over to a target cell in the second network device, and the first message includes backup information, where the backup information includes first indication information, and the first indication information is used to indicate that a backup terminal device is configured for the first terminal device;

the communication unit 502 is further configured to receive a response message from the second network device.

It is to be understood that the processing unit 501 is adapted to determine the first message. Or, the processing unit 501 is configured to process the response message.

In a possible implementation manner, the backup information further includes role information of the first terminal device, and the role information of the first terminal device includes the master terminal device.

In a possible implementation manner, the first indication information is further used to indicate that the backup terminal devices are respectively configured for the first terminal device according to different services.

In one possible implementation, the response message includes any one of:

a second message, where the second message is used to indicate that the handover preparation fails, and the second message carries a reason for the handover preparation failure, where the reason for the handover preparation failure includes that the configuration of the backup terminal device for the first terminal device fails;

a third message, configured to indicate that the handover preparation is successful, where the third message carries indication information indicating that configuring the backup terminal device for the first terminal device fails;

In a possible implementation manner, the communication unit 502 is further configured to receive a seventh message reported by the first terminal device, where the seventh message carries cell information of the backup terminal device;

a processing unit 501, configured to determine to switch the first terminal device to the target cell according to the cell information.

In a possible implementation manner, the communication unit 502 is further configured to send an eighth message to the first terminal device, where the eighth message is used to trigger the first terminal device to report the cell information.

In a possible implementation manner, the eighth message carries second indication information, where the second indication information is used to indicate that the first terminal device reports a measurement result of a cell where the backup terminal device exists.

In a possible implementation manner, the communication unit 502 is further configured to send a fourth message to the second terminal device, where the fourth message is used to notify the second terminal device that the backup terminal device needs to perform cell handover.

In a possible implementation manner, the processing unit 501 is configured to configure a backup terminal device for the second terminal device;

the communication unit 502 is further configured to send a sixth message to the second terminal device, where the sixth message includes an identifier of the configured backup terminal device.

In other embodiments of the present application, when the communication apparatus is configured to perform the post-step function performed by the second network device, the communication unit 502 is configured to receive a first message from the first network device, where the first message is used to request that the first terminal device is handed over to a target cell in the second network device, and the first message includes backup information, where the backup information includes first indication information, and the first indication information is used to indicate that a backup terminal device is configured for the first terminal device;

a processing unit 501, configured to perform a switching preparation according to the backup information; the communication unit 502 is further configured to send a response message to the first network device.

In one possible implementation, the response message includes any one of: the second message is used for indicating the failure of the switching preparation, and carries the reason of the failure of the switching preparation, wherein the reason of the failure of the switching preparation comprises the failure of configuring backup terminal equipment for the first terminal equipment; a third message, wherein the third message is used for indicating that the switching preparation is successful, and the third message carries indication information of failure of configuring the backup terminal device for the first terminal device;

In one possible implementation, the service identifier includes any one or more of the following: identification of protocol data unit PDU conversation, identification of QoS flow and identification of data radio bearer DRB.

It is understood that the above descriptions of the processing unit 501 and the communication unit 502 are only examples, and reference may also be made to the above descriptions for the specific descriptions of the respective units, which are not repeated herein.

Referring to fig. 5 again, fig. 5 is a schematic structural diagram of a communication device according to an embodiment of the present application. 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 500 shown in fig. 5 may comprise a processing unit 501 and a communication unit 502. The processing unit 501 is configured to perform data processing. The communication unit 502 is integrated with a receiving unit and a transmitting unit. The communication unit 502 may also be referred to as a transceiving unit. Alternatively, communication section 502 may be divided into a reception section and a transmission section. The following processing unit 501 and communication unit 502 are similar, and are not described in detail below.

In some embodiments of the present application, when the communication apparatus is configured to perform a function or a step performed by the first terminal device, the communication unit 502 is configured to receive an eighth message from the first network device, where the eighth message is used to trigger the communication apparatus to report cell information of the backup terminal device;

the communication unit 502 is further configured to report a seventh message to the first network device, where the seventh message carries the cell information of the backup terminal device.

A processing unit 501, configured to process the eighth message. The processing unit 501 is further configured to determine a seventh message, and the like.

In a possible implementation manner, the eighth message carries second indication information, where the second indication information is used to indicate the communication device to report a measurement result of a cell where the backup terminal device exists.

In some embodiments of the present application, when the communication apparatus is configured to perform the function or step performed by the second terminal device, the communication unit 502 is configured to receive a fourth message from the first network device, where the fourth message is used to notify the communication apparatus that the backup terminal device of the communication apparatus needs to perform cell handover.

In a possible implementation manner, the communication unit 502 is further configured to send a discovery signal, where the discovery signal is used to discover the backup terminal device; and receiving a fifth message from the backup terminal device, wherein the fifth message is used for confirming the backup terminal device.

In a possible implementation manner, the communication unit 502 is further configured to receive a sixth message from the first network device, where the sixth message includes an identifier of the configured backup terminal device.

It is understood that the product form of the communication device shown in fig. 5 is not limited to the embodiment of the present application. For example, the communication device may be a device having a processor, a memory, and a transceiver. Also for example, the communication device may be a chip having a memory and a communication interface. For example, the communication device may be a system-on-chip having a chip.

Fig. 6 is a schematic structural diagram of another communication device according to an embodiment of the present application. In some embodiments of the present application, the communication apparatus may be configured to perform the function of the first network device in the foregoing method embodiments, for example, the first network device may be a first network device or a system of chips or a chip, and the system of chips may be formed by a chip, and may also include a chip and other devices. In other embodiments of the present application, the communication device may be configured to perform the functions of the second network device in the above method embodiments, for example, the second network device may be a second network device or a system-on-chip or a chip, and the system-on-chip may be formed by a chip, and may also include a chip and other devices. In further embodiments of the present application, the communication device may be configured to perform the function of the first terminal device in the above method embodiments, such as may be the first terminal device or a system of chips or a chip, and the system of chips may be formed by a chip, and may also include a chip and other devices. In still other embodiments of the present application, the communication device is configured to perform the function of the second terminal device in the above method embodiments, for example, the second terminal device may be a second terminal device or a system of chips or a chip, and the system of chips may be formed by a chip, and may also include a chip and other devices.

The communication device 600 includes at least one processor 620 for implementing the methods provided by the embodiments of the present application. The apparatus 600 may further include a communication interface 610 for implementing transceiving operations in the methods provided by the embodiments of the present application. It is to be appreciated that specific reference can be made above to processor 620 and communication interface 610. Illustratively, the communication interface 610 is configured to receive the eighth message, and to transmit the seventh message (e.g., the communication interface is implemented by a transceiver), etc., when the communication apparatus is configured to perform a function or a step performed by the first terminal device. Alternatively, the communication interface 610 is used for inputting the eighth message and outputting the seventh message (for example, the communication interface is implemented by a pin or an interface of the chip).

In the embodiment of the present Application, the Processor 620 may be a Central Processing Unit (CPU), and the Processor 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, and the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. In an embodiment of the present application, the communication interface 610 may be a transceiver, circuit, bus, module, or other type of communication interface for communicating with other devices over a transmission medium. For example, communication interface 610 enables an apparatus in apparatus 600 to communicate with other devices. The processor 620 utilizes the communication interface 610 to send and receive data and is configured to implement the methods described in the above-described method embodiments.

The communications apparatus 600 can also include at least one memory 630 for storing program instructions and/or data. The memory 630 is coupled to the processor 620. 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 processor 620 may operate in conjunction with the memory 630. Processor 620 may execute program instructions stored in memory 630. At least one of the at least one memory may be included in the processor.

When the communication device 600 is powered on, the processor 620 can read the software program in the memory 630, interpret and execute the instructions of the software program, and process the data of the software program. When data needs to be sent wirelessly, the processor 620 performs baseband processing on the data to be sent, and outputs a baseband signal to a radio frequency circuit (not shown in fig. 6), and the radio frequency circuit performs radio frequency processing on the baseband signal and sends the radio frequency signal to the outside in the form of electromagnetic waves through an antenna. When data is transmitted to the apparatus 600, the rf circuit receives an rf signal through the antenna, converts the rf signal into a baseband signal, and outputs the baseband signal to the processor 620, and the processor 620 converts the baseband signal into data and processes the data.

In another implementation, the rf circuitry and antennas may be provided independently of the processor 620 performing baseband processing, for example in a distributed scenario, the rf circuitry and antennas may be in a remote arrangement independent of the communication device.

The specific connection medium among the communication interface 610, the processor 620 and the memory 630 is not limited in the embodiments of the present application. In the embodiment of the present application, the memory 630, the processor 620, and the communication interface 610 are connected by the bus 640 in fig. 6, the bus is represented by a thick line in fig. 6, and the connection manner between other components is merely illustrative and not limited. 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. 6, but this is not intended to represent only one bus or type of bus.

When the communication apparatus 600 is specifically used in a terminal device, for example, when the communication apparatus 600 is specifically a chip or a chip system, the output or the reception of the communication interface 610 may be a baseband signal. When the communication device 600 is a terminal device, the communication interface 610 may output or receive a radio frequency signal.

It should be noted that, the communication apparatus may perform the relevant steps of the terminal device in the foregoing method embodiments, and specific reference may be made to implementation manners provided in the foregoing steps, which are not described herein again.

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

The memory may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The non-volatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable Programmable ROM (EPROM), an Electrically Erasable Programmable ROM (EEPROM), or a flash memory. Volatile memory can be Random Access Memory (RAM), which acts as external cache memory. By way of example, but not limitation, many forms of Random Access Memory (RAM) are available, such as Static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), synchronous Dynamic Random Access Memory (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), and direct bus RAM (DR RAM).

The embodiment of the application provides a chip. The chip includes: a processor and a memory. The number of processors may be one or more, and the number of memories may be one or more. The processor may perform the steps performed by the above-described methods, and related embodiments, by reading instructions and data stored on the memory. Of course, there may be no memory in the chip.

As shown in fig. 7, fig. 7 is a schematic structural diagram of a module device according to an embodiment of the present disclosure. The module device 700 can perform the steps related to the terminal device in the foregoing method embodiments, and the module device 700 includes: a communication module 701, a power module 702, a memory module 703 and a chip module 704. The power module 702 is used for providing power for the module device; the storage module 703 is used for storing data and instructions; the communication module 701 is used for performing internal communication of the module equipment or performing communication between the module equipment and external equipment; the chip module 704 may perform the above-described method and the steps performed by the related embodiments.

It is understood that the detailed description of the chip module 704 may refer to the method shown in fig. 2 to 4, or may refer to the communication device shown in fig. 5, and will not be described in detail here.

It should be noted that, for simplicity of description, the above-mentioned method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present application is not limited by the order of acts described, as some steps may occur in other orders or concurrently depending on the application. Further, those skilled in the art will recognize that the embodiments described in this specification are preferred embodiments and that acts or modules referred to are not necessarily required for this application.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The steps of a method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software elements in a processor. The software elements may be located in ram, flash, rom, prom, or eprom, registers, among other storage media that are well known in the art. The storage medium is located in a memory, and a processor executes instructions in the memory, in combination with hardware thereof, to perform the steps of the above-described method. To avoid repetition, it is not described in detail here.

In the embodiment of the present application, the processor of the above apparatus may be a Central Processing Unit (CPU), and the processor may also be other general processors, digital Signal Processors (DSP), application Specific Integrated Circuits (ASIC), field Programmable Gate Arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

Embodiments of the present application also provide a computer storage medium, wherein the computer storage medium stores a computer program for electronic data exchange, and the computer program enables a computer to execute part or all of the steps of any one of the methods as described in the above method embodiments.

Embodiments of the present application also provide a computer program product comprising a non-transitory computer readable storage medium storing a computer program operable to cause a computer to perform some or all of the steps of any of the methods as described in the above method embodiments. The computer program product may be a software installation package.

In the several embodiments provided in the present application, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the above-described units is only one type of logical functional division, and other division manners may be possible in actual implementation, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of some interfaces, devices or units, and may be an electric or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiments of the present application.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit may be stored in a computer readable memory if it is implemented in the form of a software functional unit and sold or used as a stand-alone product. Based on such understanding, the technical solutions of the present application, in essence or part of the technical solutions contributing to the prior art, or all or part of the technical solutions, can be embodied in the form of a software product, which is stored in a memory and includes several instructions for causing a computer device (which may be a personal computer, a server, or a TRP, etc.) to execute all or part of the steps of the methods of the embodiments of the present application. And the aforementioned memory comprises: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.

The foregoing embodiments have been described in detail, and specific examples are used herein to explain the principles and implementations of the present application, where the above description of the embodiments is only intended to help understand the method and its core ideas of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. A method of cell handover, the method comprising:

a first network device sends a first message to a second network device, wherein the first message is used for requesting to switch a first terminal device to a target cell in the second network device, the first message comprises backup information, the backup information comprises first indication information, and the first indication information is used for indicating that the first terminal device is configured with the backup terminal device;

the first network device receives a response message from the second network device.

2. The method of claim 1, wherein the backup information further comprises role information of the first terminal device, and wherein the role information of the first terminal device comprises a master terminal device.

3. The method according to claim 1 or 2, wherein the first indication information is further used for indicating that backup terminal devices are respectively configured for the first terminal device according to different services.

4. A method according to any of claims 1-3, wherein the response message comprises any of:

and a third message, where the third message is used to indicate that the handover preparation is successful, and the third message carries indication information indicating that configuring the backup terminal device for the first terminal device fails.

5. The method of claim 4, wherein the third message further carries a service identifier indicating that the configuration of the backup terminal device for the first terminal device has failed.

6. The method of any of claims 1-5, wherein prior to the first network device sending the first message to the second network device, the method further comprises:

and determining to switch the first terminal equipment to the target cell according to the cell information.

7. The method according to claim 6, wherein before receiving the cell information of the backup terminal device reported by the first terminal device, the method further comprises:

8. The method of claim 7, wherein the eighth message carries second indication information, and the second indication information is used to indicate that the first terminal device reports a measurement result of a cell where a backup terminal device exists.

9. The method of claim 1, wherein the backup information further comprises role information of the first terminal device, and wherein the role information of the first terminal device comprises a backup terminal device.

10. The method of claim 9, further comprising:

11. The method according to claim 9 or 10, further comprising:

12. A method of cell handover, the method comprising:

13. The method of claim 12, wherein the backup information further comprises role information of the first terminal device, and wherein the role information of the first terminal device comprises a master terminal device.

14. The method according to claim 12 or 13, wherein the first indication information is further used to indicate that backup terminal devices are configured for the first terminal device according to different services, respectively.

15. The method according to any of claims 12-14, wherein the response message comprises any of:

16. The method of claim 15, wherein the third message further carries a service identifier indicating that the configuration of the backup terminal device for the first terminal device has failed.

17. The method of claim 16, wherein the service identifier comprises any one or more of the following:

18. A method of cell handover, the method comprising:

the first terminal device receives an eighth message from the first network device, wherein the eighth message is used for triggering the first terminal device to report cell information of the backup terminal device;

19. The method of claim 18, wherein the eighth message carries second indication information, and the second indication information is used to indicate that the first terminal device reports a measurement result of a cell where a backup terminal device exists.

20. A method for cell handover, the method comprising:

21. The method of claim 20, further comprising:

22. The method of claim 20, further comprising:

23. A communication apparatus, comprising means for performing the method of any of claims 1-22.

24. A communication apparatus, characterized in that the communication apparatus comprises a processor and a memory, the processor and the memory being interconnected, wherein the memory is configured to store a computer program comprising program instructions, the processor being configured to invoke the program instructions to perform the method of any one of claims 1 to 22.

25. A chip, wherein the chip comprises a processor and an interface, the processor and the interface being coupled; the interface is configured to receive or output a signal, and the processor is configured to execute code instructions to cause the method of any one of claims 1 to 22 to be performed.

26. 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 configured to perform the method of any one of claims 1 to 22.

27. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program comprising program instructions that, when executed by a processor, cause the processor to carry out the method according to any one of claims 1 to 22.