WO2021197160A1 - 通信方法及通信装置 - Google Patents

通信方法及通信装置 Download PDF

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Publication number
WO2021197160A1
WO2021197160A1 PCT/CN2021/082694 CN2021082694W WO2021197160A1 WO 2021197160 A1 WO2021197160 A1 WO 2021197160A1 CN 2021082694 W CN2021082694 W CN 2021082694W WO 2021197160 A1 WO2021197160 A1 WO 2021197160A1
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WO
WIPO (PCT)
Prior art keywords
access network
network device
capability information
communication
service type
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PCT/CN2021/082694
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English (en)
French (fr)
Inventor
强鹂
谭佳瑶
张向东
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华为技术有限公司
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Publication of WO2021197160A1 publication Critical patent/WO2021197160A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00835—Determination of neighbour cell lists
    • H04W36/008355—Determination of target cell based on user equipment [UE] properties, e.g. UE service capabilities

Definitions

  • This application relates to the field of communication, and in particular to a communication method and communication device.
  • the access network device (that is, the source access network device) to which the terminal device is connecting selects the target access network device for the terminal device. If there is no directly connected interface between the source access network device and the target access network device, such as X2 interface or Xn interface, you can use the interface between the access network device and the core network, such as S1 interface or N2 interface, to switch .
  • the specific process is: the source access network device selects the target access network device according to the signal strength of other access network devices, and sends a handover request to the target access network device through the core network, and then receives it from the target access network device through the core network Switch response.
  • the source access network device may send the configuration information of the wireless resource included in the handover response to the terminal device, so that the terminal device can access the target access network device. That is to say, the foregoing handover procedure involves complex signaling interaction between the access network device and the core network, and the signaling overhead is relatively large.
  • the target access network equipment selected only based on signal strength may not support the service of the terminal equipment, that is, the target access network equipment selection is unreasonable .
  • the success rate of the above handover process is low, which results in the need to perform the above handover process multiple times to successfully handover, wastes a lot of signaling resources, low handover efficiency, and even executes the above handover process multiple times may fail the handover, eventually leading to the terminal The communication of the device is interrupted.
  • the embodiments of the present application provide a communication method and a communication device, which can improve the accuracy of target base station selection and improve handover efficiency.
  • a communication method includes: receiving a first handover request from a source access network device, determining first capability information, and determining whether at least one first candidate access network device can provide a service for the terminal device according to the first capability information.
  • the first handover request includes the identification of at least one first candidate access network device and service type information of the terminal device, and the first capability information is used to indicate the service capability of the at least one first candidate access network device.
  • the first network element receives a first handover request from a source access network device, and the first handover request includes an identifier of at least one first candidate access network device And the service type information of the terminal device, and then determine the first capability information used to indicate the service capability of the at least one first candidate access network device, and the first network element determines the at least one first candidate access network device according to the first capability information Whether the networked device can provide services for the terminal device, or if the terminal device cannot provide the service, the first network element sends a handover response indicating that the terminal device cannot be provided with the service to the source access network device.
  • the first network element determines whether the first candidate access network device can be a legal target access network device, which can reduce the complicated signaling interaction between the first network element and the first candidate access network device, and save A large amount of signaling resources, and the first network element considers the capability information of the first candidate access network device in the judgment process, which can improve the handover success rate and reliability, thereby improving the handover efficiency.
  • the service type of the terminal device may include one or more of the following: reduced capacity (REDCAP), multicast broadcast service (MBS), vehicle-to-everything (V2X) ), non-public network (NPN).
  • REDCAP reduced capacity
  • MBS multicast broadcast service
  • V2X vehicle-to-everything
  • NPN non-public network
  • the first capability information comes from the second network element. That is, the first network element can determine whether it has the first capability information, and if there is no or lack of the first capability information of some of the first candidate access network devices, it can interact with the second network element to obtain the first capability. information.
  • the communication method described in the first aspect may further include: receiving second capability information from a second network element.
  • the second capability information is used to determine at least one second candidate access network device. That is, the first network element may also interact with the second network element to obtain second capability information, so as to provide at least one second candidate access network device for the source access network device.
  • the communication method described in the first aspect may further include: sending a handover response to the source access network device.
  • the handover response includes the identification of at least one second candidate access network device, and the at least one second candidate access network device is determined according to the service type of the terminal device.
  • the first network element determines that the target access network device selection is unreasonable, it can provide the source access network device with a suggested list of target access network devices, that is, at least one second candidate access network device for the source
  • the access network device reselects the target access network device, thereby further improving the handover efficiency.
  • a communication method includes: sending a first handover request to a first network element, and receiving a handover response from the first network element.
  • the first handover request includes the identification of at least one first candidate access network device and service type information of the terminal device, and the handover response is used to indicate that the at least one first candidate access network device cannot provide service for the terminal device.
  • the service type of the terminal device may include one or more of the following: capacity reduction, multicast broadcast service, vehicle-connected everything, and non-public network.
  • the handover response may include the identification of at least one second candidate access network device, and the at least one second candidate access network device is determined according to the service type of the terminal device. That is, the source access network device can receive at least one second candidate access network device that is recommended by the first network element and supports the service of the terminal device.
  • the communication method described in the second aspect may further include: determining the target access network device according to the identifier of the at least one second candidate access network device. In this way, the source access network device can select the target access network device from the at least one second candidate access network device suggested by the first network element, which can improve the success rate of handover of the terminal device.
  • the communication method described in the second aspect may further include: sending a second handover request to the first network element.
  • the second handover request includes the identifier of the target access network device.
  • the source access network device may also send a second handover request to the first network element, and the target access network device is at least one second candidate from the service corresponding to the service type of the terminal device. The one selected from the access network equipment can increase the handover success rate, thereby improving the handover efficiency.
  • a communication method includes: determining first capability information, and selecting a target access network device based on the signal strength of at least one first candidate access network device and the first capability information.
  • the first capability information is used to indicate the service capability of at least one first candidate access network device.
  • the source access network device considers the service capability of the first candidate access network device when determining the target access network device, which can solve the problem of selecting only based on signal strength
  • the target access network device does not support the service of the terminal device, which can improve the handover success rate and reliability, save a large amount of signaling resources, and thereby improve the handover efficiency.
  • the foregoing determining the first capability information includes: sending a capability information request to the first network element or the terminal device.
  • the capability information request may include the identification and/or service type information of at least one first candidate access network device, the capability information request is used to request the first capability information, and the service type information is used to indicate the scope of the first capability information.
  • the method for the source access network device to obtain the first capability information includes: obtaining the first capability information from the first network element and obtaining the first capability information from the terminal device.
  • the capability information request is used to instruct the terminal device to monitor system messages of at least one first candidate access network device and determine the first capability information.
  • the service type information may include the service type of the terminal device, and the service type of the terminal device may include one or more of the following: capacity reduction, multicast broadcast service, vehicle-linked everything, and non-public network.
  • a communication method includes: a first network element receives a capability information request from a source access network device, and sends the first capability information to the source access network device.
  • the capability information request includes the identification and/or service type information of at least one first candidate access network device, the capability information request is used to request the first capability information, and the service type information is used to indicate the scope of the first capability information.
  • the first capability information comes from the second network element. That is, the first network element can determine whether it has the first capability information, and if there is no or lack of the first capability information of some of the first candidate access network devices, it can interact with the second network element to obtain the first capability. information.
  • the communication method described in the fourth aspect may further include: the first network element receives second capability information from the second network element.
  • the second capability information is used to determine at least one second candidate access network device. That is, the first network element may also interact with the second network element to obtain second capability information, so as to provide at least one second candidate access network device for the source access network device.
  • the service type information may include the service type of the terminal device, and the service type of the terminal device may include one or more of the following: capacity reduction, multicast broadcast service, vehicle-linked everything, and non-public network.
  • a communication method includes: a terminal device receives a capability information request from a source access network device, and sends first capability information to the source access network device.
  • the capability information request includes the identification and/or service type information of at least one first candidate access network device, the capability information request is used to request the first capability information, and the service type information is used to indicate the scope of the first capability information.
  • the communication method described in the fifth aspect may further include: the terminal device monitors the system message of at least one first candidate access network device and determines the first capability information. In this way, the terminal device can obtain the first capability information by monitoring system messages of several cells.
  • the service type information may include the service type of the terminal device, and the service type of the terminal device may include one or more of the following: capacity reduction, multicast broadcast service, vehicle-linked everything, and non-public network.
  • a communication device in a sixth aspect, includes: a transceiver module and a processing module.
  • the transceiver module is used to receive the first handover request from the source access network device.
  • the first handover request includes the identification of at least one first candidate access network device and the service type information of the terminal device.
  • the processing module is used to determine the first capability information.
  • the first capability information is used to indicate the service capability of at least one first candidate access network device.
  • the processing module is further configured to determine whether at least one first candidate access network device can provide a service for the terminal device according to the first capability information.
  • the service type of the terminal device may include one or more of the following: capacity reduction, multicast broadcast service, vehicle-connected everything, and non-public network.
  • the first capability information comes from the second network element.
  • the transceiver module is also used to receive second capability information from the second network element.
  • the second capability information is used to determine at least one second candidate access network device.
  • the transceiver module is also used to send a handover response to the source access network device.
  • the handover response may include the identification of at least one second candidate access network device, and the at least one second candidate access network device is determined according to the service type of the terminal device.
  • the transceiver module described in the sixth aspect may include a receiving module and a sending module.
  • the receiving module is used to receive data and/or signaling from the source access network device and/or the second network element; the sending module is used to send data and/or signaling to the source access network device and/or the second network element Signaling.
  • This application does not specifically limit the specific implementation of the transceiver module.
  • the communication device of the sixth aspect may further include a storage module, and the storage module stores a program or instruction.
  • the processing module executes the program or instruction
  • the communication device described in the sixth aspect can execute the method described in the first aspect.
  • the communication device described in the sixth aspect may be a first network element, such as an access and mobility management function (core access and mobility management function, AMF) network element, or it may be set in an access network.
  • AMF access and mobility management function
  • the chip (system) or other components or components of the device are not limited in this application.
  • a communication device in a seventh aspect, includes: a receiving module and a sending module. Wherein, the sending module is used to send the first handover request to the first network element. Wherein, the first handover request includes the identification of at least one first candidate access network device and service type information of the terminal device. The receiving module is further configured to receive a handover response from the first network element, where the handover response is used to indicate that at least one first candidate access network device cannot provide service for the terminal device.
  • the service type of the terminal device may include one or more of the following: capacity reduction, multicast broadcast service, vehicle-connected everything, and non-public network.
  • the handover response may include the identification of at least one second candidate access network device, and the at least one second candidate access network device is determined according to the service type of the terminal device.
  • the communication device described in the seventh aspect may further include a processing module.
  • the processing module is configured to determine the target access network device according to the identifier of the at least one second candidate access network device.
  • the sending module is also used to send the second handover request to the first network element.
  • the second handover request includes the identifier of the target access network device.
  • the receiving module and the sending module can be set separately or integrated into one module, namely the transceiver module. This application does not specifically limit the specific implementation of the receiving module and the sending module.
  • the communication device of the seventh aspect may further include a storage module, and the storage module stores a program or instruction.
  • the processing module executes the program or instruction
  • the communication device described in the seventh aspect can execute the method described in the second aspect.
  • the communication device described in the seventh aspect may be a source access network device, or a chip (system) or other components or components that can be set in the source access network device, which is not limited in this application. .
  • a communication device includes: a processing module. Among them, the determining module and the selecting module are used to determine the first capability information.
  • the first capability information is used to indicate the service capability of at least one first candidate access network device.
  • the selection module is configured to select the target access network device according to the signal strength and first capability information of the at least one first candidate access network device.
  • the communication device described in the eighth aspect may further include a transceiver module.
  • the transceiver module is used to send a capability information request to the first network element or terminal device.
  • the capability information request includes the identification and/or service type information of at least one first candidate access network device, the capability information request is used to request the first capability information, and the service type information is used to indicate the scope of the first capability information.
  • the capability information request is used to instruct the terminal device to monitor system messages of at least one first candidate access network device and determine the first capability information.
  • the service type information may include the service type of the terminal device, and the service type of the terminal device may include one or more of the following: capacity reduction, multicast broadcast service, vehicle-linked everything, and non-public network.
  • the transceiver module of the eighth aspect may include a receiving module and a sending module.
  • the receiving module is used to receive data and/or signaling from the first network element and/or terminal device;
  • the transmitting module is used to send data and/or signaling to the first network element and/or terminal device.
  • This application does not specifically limit the specific implementation of the transceiver module.
  • the determination module and the selection module described in the eighth aspect both perform processing functions, which can be set separately or integrated into one module, that is, the processing module. This application does not specifically limit the specific implementation of the determination module and the selection module.
  • the communication device of the eighth aspect may further include a storage module that stores programs or instructions.
  • the processing module executes the program or instruction
  • the communication device described in the eighth aspect can execute the method described in the third aspect.
  • the communication device described in the eighth aspect may be a source access network device, or a chip (system) or other components or components that can be set in the source access network device, which is not limited in this application. .
  • the technical effect of the communication device described in the eighth aspect may refer to the technical effect of the communication method described in any one of the possible implementation manners of the third aspect, which will not be repeated here.
  • a communication device in a ninth aspect, includes: a receiving module and a sending module.
  • the receiving module is used to receive the capability information request from the source access network device.
  • the capability information request includes the identification and/or service type information of at least one first candidate access network device, the capability information request is used to request the first capability information, and the service type information is used to indicate the scope of the first capability information.
  • the sending module is used to send the first capability information to the source access network device.
  • the first capability information comes from the second network element.
  • the receiving module is also used to receive second capability information from the second network element.
  • the second capability information is used to determine at least one second candidate access network device.
  • the service type information may include the service type of the terminal device, and the service type of the terminal device may include one or more of the following: capacity reduction, multicast broadcast service, vehicle-linked everything, and non-public network.
  • the receiving module and the sending module can be set separately or integrated into one module, namely the transceiver module. This application does not specifically limit the specific implementation of the receiving module and the sending module.
  • the communication device of the ninth aspect may further include a processing module and a storage module, and the storage module stores programs or instructions.
  • the processing module executes the program or instruction
  • the communication device described in the ninth aspect can execute the method described in the fourth aspect.
  • the communication device described in the ninth aspect may be the first network element, or may be a chip (system) or other components or components that can be installed in the first network element, which is not limited in this application.
  • a communication device in a tenth aspect, includes: a receiving module and a sending module.
  • the receiving module is used to receive the capability information request from the source access network device.
  • the capability information request includes the identification and/or service type information of at least one first candidate access network device, the capability information request is used to request the first capability information, and the service type information is used to indicate the scope of the first capability information.
  • the sending module is also used to send the first capability information to the source access network device.
  • the communication device described in the tenth aspect may further include a processing module.
  • the processing module is configured to monitor system messages of at least one first candidate access network device and determine the first capability information.
  • the service type information may include the service type of the communication device, and the service type of the communication device may include one or more of the following: capacity reduction, multicast broadcast service, vehicle-linked everything, and non-public network.
  • the receiving module and the sending module can be set separately or integrated into one module, namely the transceiver module. This application does not specifically limit the specific implementation of the receiving module and the sending module.
  • the communication device of the tenth aspect may further include a storage module, and the storage module stores a program or instruction.
  • the processing module executes the program or instruction
  • the communication device described in the tenth aspect can execute the method described in the fifth aspect.
  • the communication device described in the tenth aspect may be a terminal device, or a chip (system) or other components or components that can be installed in the terminal device, which is not limited in this application.
  • a communication device in an eleventh aspect, includes a processor and a communication interface.
  • the processor is configured to communicate with other devices through a communication interface, and execute the communication method described in any one of the possible implementation manners of the first aspect to the fifth aspect.
  • the communication interface may be a transceiver circuit for the communication device to communicate with other communication devices.
  • the communication device described in the eleventh aspect may further include a memory.
  • the memory is used to store computer programs.
  • the transceiver can be used for the communication device to communicate with other communication devices.
  • the communication device described in the eleventh aspect may be a first network element or a source access network device or terminal device, or may be provided in a chip of the first network element or source access network device or terminal device ( System) or other components or components.
  • the twelfth aspect provides a communication system.
  • the system includes a first network element, source access network equipment, target access network equipment, and terminal equipment.
  • the first network element may be an AMF network element.
  • the system may also include a second network element, such as an AMF network element, a unified data management (UDM) network element, and an operation, administration and maintenance (OAM) network element.
  • AMF AMF network element
  • UDM unified data management
  • OAM operation, administration and maintenance
  • a computer-readable storage medium including: the computer-readable storage medium includes a computer program or instruction; when the computer program or instruction runs on a computer, the computer executes the first to fifth aspects.
  • a computer program product including a computer program or instruction.
  • the computer program or instruction runs on a computer, the computer can execute any one of the possible implementation manners of the first aspect to the fifth aspect.
  • FIG. 1 is a schematic diagram of the architecture of a communication system provided by an embodiment of the application
  • FIG. 2 is a first structural diagram of a communication device provided by an embodiment of this application.
  • FIG. 3 is a first flowchart of a communication method provided by an embodiment of this application.
  • FIG. 4 is a schematic diagram 2 of the flow of the communication method provided by an embodiment of this application.
  • FIG. 5 is a third schematic flowchart of a communication method provided by an embodiment of this application.
  • FIG. 6 is a fourth flowchart of a communication method provided by an embodiment of this application.
  • FIG. 7 is a second structural diagram of a communication device provided by an embodiment of this application.
  • FIG. 8 is a third structural diagram of a communication device provided by an embodiment of this application.
  • FIG. 9 is a fourth structural diagram of a communication device provided by an embodiment of this application.
  • FIG. 10 is a fifth structural schematic diagram of a communication device provided by an embodiment of this application.
  • FIG. 11 is a sixth structural diagram of a communication device provided by an embodiment of this application.
  • WiFi wireless fidelity
  • V2X vehicle-to-everything
  • D2D device-todevie
  • Communication systems vehicle networking communication systems
  • 4th generation (4G) mobile communication systems such as long term evolution (LTE) systems
  • WiMAX worldwide interoperability for microwave access
  • 5G fifth generation mobile communication system
  • NR new radio
  • 6G sixth generation
  • FIG. 1 is a schematic diagram of the architecture of a communication system to which the communication method provided in an embodiment of the application is applicable.
  • the communication system shown in FIG. 1 is taken as an example to describe in detail the communication system applicable to the embodiments of the present application.
  • the solutions in the embodiments of the present application can also be applied to other mobile communication systems, and the corresponding names can also be replaced with the names of corresponding functions in other mobile communication systems.
  • the communication system includes a first network element, a source access network device, a target access network device, and terminal devices.
  • the communication system may further include a second network element.
  • the first network element is a device that is located on the network side of the communication system and provides network services for terminal devices, or a chip (system) or other components or components that can be installed in the device.
  • the first network element may be a core network element, such as an access and mobility management function (core access and mobility management function, AMF) network element.
  • AMF access and mobility management function
  • the second network element is a device located on the network side of the communication system and can communicate with the first network element, or a chip (system) or other components or components that can be installed in the device.
  • the second network element may be a core network element, such as an AMF network element or a unified data management (UDM) network element.
  • the second network element may also be other network elements, such as operations, administration and maintenance (OAM) network elements.
  • OAM operations, administration and maintenance
  • the first network element and the second network element are both AMF network elements
  • the first network element and the second network element may be the same AMF network element, that is, the source access network device and the target access network
  • the devices are all access network devices managed by the same AMF network element, or different AMF network elements, that is, the source access network device and the target access network device are managed by different AMF network elements.
  • the aforementioned source access network equipment and target access network equipment may also be collectively referred to as access network equipment.
  • the access network device is a device that is located on the network side of the above-mentioned communication system and has a wireless transceiver function, or a chip (system) or other components or components that can be installed in the device.
  • Access network equipment includes but is not limited to: access points (AP) in wireless fidelity (WiFi) systems, such as home gateways, routers, servers, switches, bridges, etc., evolved node B ( evolved Node B (eNB), radio network controller (RNC), node B (Node B, NB), base station controller (BSC), base transceiver station (base transceiver station, BTS), Home base station (for example, home evolved NodeB, or home Node B, HNB), baseband unit (BBU), wireless relay node, wireless backhaul node, transmission point (transmission and reception point, TRP or transmission point, TP) ), etc., can also be 5G, such as gNB in the new radio (NR) system, or transmission point (TRP or TP), one or a group of base stations in the 5G system (including multiple antenna panels)
  • the antenna panel or, can also be a network node that constitutes a gNB or transmission point, such as a baseband unit (BBU), or a
  • the above-mentioned OAM network element may also be referred to as an OAM device.
  • the foregoing AMF network elements, UDM network elements, OAM network elements, and access network devices may also be collectively referred to as network devices.
  • the embodiment of this application does not specifically limit the specific names of the foregoing first network element and second network element. .
  • the above-mentioned terminal equipment is a terminal that is connected to the above-mentioned communication system and has a wireless transceiver function, or a chip (system) or other components or components that can be installed in the terminal.
  • the terminal device may also be called a user device, an access terminal, a user unit, a user station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, or a user device.
  • the terminal device in the embodiment of the present application may be a mobile phone (mobile phone), a tablet computer (Pad), a computer with a wireless transceiver function, a virtual reality (VR) terminal device, and an augmented reality (AR) terminal Equipment, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical, wireless terminals in smart grid, transportation safety ( Wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, vehicle-mounted terminals, RSUs with terminal functions, etc.
  • the terminal device of the present application may also be a vehicle-mounted module, vehicle-mounted module, vehicle-mounted component, vehicle-mounted chip, or vehicle-mounted unit that is built into a vehicle as one or more components or units. The vehicle passes through the built-in vehicle-mounted module, vehicle-mounted module, The on-board component, on-board chip or on-board unit can implement the communication method provided in this application.
  • the communication method provided in the embodiment of the present application may be applicable to the communication between the source access network device and the first network element shown in FIG. 1.
  • the communication method can also be used for the communication between the source access network device and the terminal device shown in FIG. 1.
  • FIG. 1 is only a simplified schematic diagram of an example for ease of understanding, and the communication system may also include other network devices and/or other terminal devices, which are not shown in FIG. 1.
  • FIG. 2 is a first structural diagram of a communication device that can be used to implement the communication method provided by an embodiment of the present application.
  • the communication device may be the first network element, or a chip (system) or other components or components applicable to the first network element.
  • the communication device may be a source access network device, or a chip (system) or other components or components applicable to the source access network device.
  • the communication device may also be a terminal device, or a chip (system) or other components or components applicable to the terminal device.
  • the communication device 200 includes a processor 201 and a communication interface 202.
  • the processor 201 may be integrated with the communication interface 202, or may exist independently.
  • the communication device 200 may further include a memory 203, and the memory 203 may be integrated with the processor 201 or may exist independently, which is not specifically limited in the embodiment of the present application.
  • each component of the communication device 200 will be specifically introduced with reference to FIG. 2:
  • the processor 201 is the control center of the communication device 200, and may be a processor or a collective name for multiple processing elements.
  • the processor 201 is one or more central processing units (CPU), or an application specific integrated circuit (ASIC), or is configured to implement one or more of the embodiments of the present application.
  • An integrated circuit for example: one or more microprocessors (digital signal processors, DSP), or one or more field programmable gate arrays (FPGA).
  • the processor 201 can execute various functions of the communication device 200 by running or executing a software program stored in the memory 203 and calling data stored in the memory 203.
  • the processor 201 may include one or more CPUs, such as CPU0 and CPU1 shown in FIG. 2.
  • the communication device 200 may also include multiple processors, such as the processor 201 and the processor 204 shown in FIG. 2. Each of these processors can be a single-core processor (single-CPU) or a multi-core processor (multi-CPU).
  • the processor here may refer to one or more communication devices, circuits, and/or processing cores for processing data (for example, computer program instructions).
  • the memory 203 can be a read-only memory (ROM) or other types of static storage communication devices that can store static information and instructions, a random access memory (RAM), or other types that can store information and instructions.
  • the type of dynamic storage communication equipment can also be electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disk storage, Optical disc storage (including compact disc, laser disc, optical disc, digital universal disc, Blu-ray disc, etc.), magnetic disk storage media or other magnetic storage communication devices, or can be used to carry or store desired program codes in the form of instructions or data structures. Any other medium that can be accessed by the computer, but not limited to this.
  • the memory 203 is used to store a software program for executing the solution of the present application, and the processor 201 controls the execution.
  • the processor 201 controls the execution.
  • the communication interface 202 may be a transceiver circuit for communication with other communication devices.
  • the communication apparatus 200 is a first network element, and the communication interface 202 may be used to communicate with a source access network device or communicate with a second network element.
  • the communication apparatus 200 is a source access network device, and the communication interface 202 may be used to communicate with a terminal device or communicate with a first network element.
  • the communication apparatus 200 is a terminal device, and the communication interface 202 may be used to communicate with a source access network device.
  • the transceiver circuit may be a device such as a transceiver or a transceiver.
  • the communication interface 202 may also be an input/output (I/O) circuit of the processor 201 to implement signal input and signal output of the processor 201.
  • I/O input/output
  • the structure of the communication device 200 shown in FIG. 2 does not constitute a limitation on the communication device.
  • the actual communication device may include more or less components than those shown in the figure, or combine certain components, or Different component arrangements.
  • FIG. 3 is a first schematic flowchart of a communication method provided by an embodiment of this application. This communication method can be applied to the communication between the first network element and the source access network device shown in FIG. 1.
  • the communication method includes the following steps:
  • the source access network device sends a first handover request to the first network element.
  • the first network element receives the first handover request from the source access network device.
  • the first handover request includes the identification of at least one first candidate access network device and service type information of the terminal device.
  • the terminal device may send a measurement report to the source access network device.
  • the source access network device can receive the measurement report from the terminal device.
  • the measurement report may include measurement results of at least one access network device, such as signal strength, channel status, and so on.
  • the source access network device may select at least one first candidate access network device from at least one access network device according to the signal strength as the candidate target access network device of the terminal device. That is, the source access network device can select the access network device whose signal strength meets the requirements of the terminal device as the candidate target access network device.
  • the service type of terminal equipment may include one or more of the following: reduced capability (REDCAP), multicast broadcast service (MBS), vehicle-to-everything (V2X) ), non-public network (NPN). It should be noted that the terminal device may also include other types of services, which are not limited in this application.
  • REDCAP reduced capability
  • MMS multicast broadcast service
  • V2X vehicle-to-everything
  • NPN non-public network
  • the first network element determines first capability information.
  • the first capability information is used to indicate the service capability of at least one first candidate access network device.
  • the first capability information may include: the identification of at least one first candidate access network device and whether it supports the service type of the terminal device.
  • the first capability information may also include: specific capabilities of the access network device.
  • the first capability information may include: access network device 1, supporting REDCAP, and the maximum access bandwidth value of the supported REDCAP terminal device.
  • the first capability information may include: the access network device 1, which supports MBS, and which MBS services are specifically supported.
  • the first capability information may include: access network device 1, supporting V2X, and whether the scheduling mode of the PC5 port is mode 2 (mode 2) or mode 3 (mode 3).
  • the first capability information may include: access network device 1, supporting NPN, and supporting closed access group ID (CAG ID).
  • CAG ID closed access group ID
  • the first capability information may include: access network device 2 does not support REDCAP, does not support MBS, does not support V2X, and does not support NPN.
  • the first capability information may also include other types of capability information of at least one first candidate access network device, such as current load conditions, congestion control strategies, security control strategies, and subscription conditions (such as the use of access network devices). Rights), other management and control strategies, etc.
  • the first network element determining the first capability information may include: the first network element determines the first capability information according to known information, and/or the first network element obtains the first capability information from the second network element.
  • the second network element may be an AMF network element, a UDM network element, or an OAM network element.
  • the embodiment of the present application does not specifically limit the source of the first capability information.
  • the specific principle for the first network element to determine the first capability information using the above-mentioned method is as follows.
  • the first network element may determine the first capability information only based on the known information.
  • the first network element can only determine the first capability information of part of the first candidate access network device or the first capability information of the first candidate access network device based on the known information, the first network element A part of the first capability information may be determined based on the known information, and another part of the first capability information may be obtained from the second network element.
  • the first network element may also omit the step of determining the first capability information based on known information, and directly obtain all the first capability information from the second network element.
  • the foregoing first network element obtains the first capability information from the second network element, which may specifically include the following S303 to S304.
  • the first network element sends a first capability request to the second network element.
  • the second network element receives the first capability request from the first network element.
  • the first capability request may include: an identifier of at least one first candidate access network device.
  • the first capability request includes the identification of the access network device 1 and the identification of the access network device 2, so that the first network element can request the second network element for the access network device 1, the access network device mastered by the second network element. All service capabilities of networked device 2.
  • the first capability request may include: the identification of the at least one first candidate access network device and the service type information of the terminal device.
  • the first capability request includes the identifier of the access network device 1, the identifier of the access network device 2, and the MBS, and the first network element requests the second network element for the MBS service capability of the access network device 1 for the terminal device. , The service capability of the access network device 2 to the MBS of the terminal device.
  • the second network element sends a first capability response to the first network element.
  • the first network element receives the first capability response from the second network element.
  • the first capability response includes first capability information.
  • the first capability request includes: the identity of access network device 1, the identity of access network device 2, and MBS
  • the first capability information may have the following Several ways to achieve it.
  • the first capability information may include: access network device 1.
  • the first capability information may include: the access network device 1 supports MBS. That is, the second network element may only return the capability information of the access network device that supports the service type requested in the first capability request.
  • the first capability information may include: access network device 1, which supports MBS; and access network device 2, which does not support MBS. That is to say, which access network equipment and which service types of terminal equipment are requested by the first network element, and which capability information is returned by the second network element.
  • the first capability information may also include capability information not requested by the first network element.
  • the first capability information may include: access network device 1, which supports MBS; access network device 2, which does not support MBS; access network device 3, which supports MBS; and access network device 4, which does not support MBS. That is, the second network element can return the MBS service capability of the access network device to the terminal device that is not requested by the first network element.
  • the first capability information may further include: access network device 1, which supports MBS, but does not support NPN; and access network device 2, which does not support MBS, but supports NPN. That is to say, in addition to the information about whether the first candidate access network device supports MBS, the second network element can also return other service capabilities of the first candidate access network device, and can also return the current load situation, congestion control strategy, etc. Other types of capability information.
  • the first capability information may further include: access network device 1, which supports MBS, but does not support NPN; access network device 2, which does not support MBS, but supports NPN; and access network device 3, which supports MBS, but supports NPN; Access network equipment 4 does not support MBS but supports NPN. That is, in addition to the MBS service capability of the first candidate access network device to the terminal device requested by the first network element, the second network element may also return other service capabilities of the first candidate access network device, and/or, The service capability of the access network device not requested by the first network element may also return other types of capability information such as the current load situation and congestion control strategy.
  • the first network element can determine whether at least one first candidate access network device can provide a service for the terminal device.
  • the first network element determines whether at least one first candidate access network device can provide a service for the terminal device according to the first capability information.
  • the first network element determines that at least one first candidate access network device can provide services for the terminal device according to the first capability information.
  • the element sends an N2 handover message (N2 handover) to complete the handover of the terminal device from the source access network device to the target access network device.
  • N2 handover N2 handover message
  • the first capability information includes: access network equipment 1, which supports MBS; access network equipment 2, which supports MBS, then access network equipment 1, access network equipment 2 If both can provide the MBS service for the terminal device, the first network element can perform the following S308.
  • the first capability information includes: access network equipment 1, which supports MBS; access network equipment 2, which does not support MBS, then access network equipment 1 can provide terminal equipment service. That is, as long as any one of the plurality of first candidate access network devices can provide a service for the terminal device, the first network element can perform the following S308.
  • the service type requested by the terminal device is MBS and V2X
  • the priority of MBS is higher than the priority of V2X
  • the first capability information includes: access network device 1, which supports MBS but does not support V2X; Device 2, does not support MBS, does not support V2X, you can determine whether the access network device can provide services for the terminal device according to the priority of the service type, which is not limited in this application.
  • the first network element may determine the second capability information , And determine at least one second candidate access network device according to the second capability information.
  • at least one second candidate access network device is an access network device that can provide services for terminal devices.
  • the second capability information may be used to determine at least one second candidate access network device.
  • the second capability information may include capability information of an access network device that can provide services for the terminal device, which is determined according to the service type of the terminal device.
  • the second capability information includes at least one capability information of an access network device that can provide services for the terminal device, so that the first network element can determine the second candidate access network device.
  • the specific content of the second capability information reference may be made to the specific content of the first capability information in S302, which will not be repeated here.
  • the first capability information includes: access network device 1, which does not support MBS; access network device 2, which does not support MBS, that is, access network device 1, access network If neither device 2 can provide a service for the terminal device, the first network element may determine the second capability information, and determine at least one second candidate access network device according to the second capability information.
  • the first network element may also determine a suggested target-RAN-list for the source access network device. ), that is, at least one second candidate access network device, the source access network device can select the target access network device based on the at least one second candidate access network device, and initiate a handover request again, thereby improving the handover success rate and reliability .
  • At least one first candidate access network device is a candidate access network device determined by the source access network device, and the first network element determines whether it can be used as a target access network device, and at least one second candidate access network device
  • the network access device is an access network device that is determined by the first network element and can provide services for the terminal device, and the source access network device determines the target access network device from it.
  • the at least one second candidate access network device does not include at least one first network element.
  • a candidate access network device that is, when the first network element determines the second candidate access network device list, it excludes at least one first candidate access network device that has been determined to be unable to provide services for the terminal device, and narrows the selection range of the second candidate access network device. , Thereby improving switching efficiency.
  • determining the second capability information by the first network element may include: the first network element determines the second capability information according to known information, and/or the second capability information may also come from the second network element.
  • the first network element can determine the second capability information only based on known information, the first network element can also obtain the second capability information from the second network element, and the first network element can also be combined with the first network element.
  • the known information and the information fed back by the second network element determine the second capability information.
  • the embodiment of the present application does not specifically limit the source of the second capability information.
  • the first network element obtains the second capability information from the second network element, which may specifically include the following steps 1 to 2:
  • Step 1 The first network element sends a second capability request to the second network element.
  • the second network element receives the second capability request from the first network element.
  • the second capability request may include: service type information of the terminal device, that is, the first network element may request a second candidate access network device that can provide services for the terminal device from the second network element.
  • the second capability request includes MBS.
  • the second capability request includes MBS and NPN.
  • Step 2 The second network element sends a second capability response to the first network element.
  • the first network element receives the second capability response from the second network element.
  • the second capability response includes second capability information.
  • the second capability request includes MBS, V2X, NPN, and second capability information
  • the second capability information may include: access network device 5, supporting MBS, supporting V2X, and supporting NPN; and access network device 6, supporting MBS, supporting V2X, and supporting NPN.
  • the second network element may only return the capability information of the access network devices that support all service types requested in the second capability request, that is, the second network element only returns the access network devices that support MBS, V2X, and NPN at the same time 5.
  • the second capability information may include: access network equipment 5, supporting MBS, supporting V2X, and supporting NPN; access network equipment 6, supporting MBS, supporting V2X, and supporting NPN; access network equipment 7, not supporting MBS , Support V2X, support NPN. That is, when the second capability request includes multiple service types, the second network element may also return the capability information of the access network device that supports part of the service types included in the second capability request, that is, the second network element may return The capability information of the access network device 5 and the access network device 6 that support MBS, V2X, and NPN at the same time, and the capability information of the access network device 7 that does not support MBS but supports V2X and NPN can also be returned.
  • the second capability information may include: access network equipment 5, support MBS, support V2X, support NPN, but not REDCAP; access network equipment 6, support MBS, support V2X, support NPN, support REDCAP; access; Network equipment 7, does not support MBS, supports V2X, supports NPN, and supports REDCAP. That is to say, the second network element can also return other service capabilities of the access network device that supports part or all of the service type information included in the second capability request, such as whether to support REDCAP, and can also return the current load status, congestion control strategy, etc. Other types of capability information.
  • this application does not limit the implementation manner of the second capability information, and it is subject to the ability to determine at least one second candidate access network device.
  • the first network element may also obtain the second capability information during the interaction between the first network element and the second network element in S303 to S304, and this application does not limit when to obtain the second capability information.
  • the following specifically describes the determination of at least one second candidate access network device by the first network element according to the second capability information.
  • the second capability information includes: access network device 5, which supports MBS; access network device 6, which supports MBS; and access network device 7, which does not support MBS, at least A second candidate access network device includes an access network device 5 and an access network device 6.
  • the access network device that supports all the services requested by the terminal device at the same time can be selected first as the second candidate access network device, and the number of service types requested by the terminal device can also be selected.
  • the most access network device is used as the second candidate access network device, and the second candidate access network device may also be selected according to the priority of the service type.
  • the second candidate access network device may be selected based on the following rules:
  • the second candidate access network device can also be selected according to the priority of the service type.
  • the access network device that supports MBS and V2X can be selected first as the second candidate access network device, and the access network that supports MBS and NPN can also be selected.
  • the device serves as the second candidate access network device, and an access network device that supports MBS can also be selected as the second candidate access network device.
  • the first network element may determine at least one second candidate access network device according to the actual needs of the terminal device, which is not limited in this application.
  • the first network element sends a handover response to the source access network device.
  • the source access network device receives the handover response from the first network element.
  • the handover response is used to indicate that at least one first candidate access network device cannot provide service for the terminal device.
  • the service type requested by the terminal device is MBS
  • the first capability information includes: the access network device 1 does not support MBS
  • the handover response indicates that the access network device 1 cannot provide services for the terminal device.
  • the handover response may include the identification of at least one second candidate access network device, and the at least one second candidate access network device is determined according to the service type of the terminal device.
  • the handover response may also include a list of target access network devices, that is, the identification of at least one second candidate access network device, for use by the source access network device when selecting the target access network device again. The device may select the target access network device based on the at least one second candidate access network device, and initiate the second handover request.
  • the source access network device may also send a second handover request to the first network element.
  • the first network element may also receive the second handover request from the source access network device.
  • the second handover request includes the identification of the target access network device, and the identification of the target access network device may be determined from at least one second candidate access network device.
  • the source access network device may determine the target access network device from the at least one second candidate access network device according to the signal strength. That is to say, when the source access network device re-determines the target access network device, it can select the access network device with the strongest signal strength from the access network devices suggested by the first network element that can provide services for the terminal device.
  • the target access network equipment eliminates the access network equipment that cannot provide services for the terminal equipment, which can improve the selection efficiency of the target access network equipment.
  • the source access network device can also select the target access network device from at least one second candidate access network device according to other types of capability information of the access network device.
  • select the access network device with the lightest current load as the target access network device and select the access network device with the fastest transmission rate as the target access network device according to the access bandwidth of the access network device.
  • the specific implementation method can be set according to actual needs. This is not limited.
  • N2 handover message N2 handover
  • the first network element after the first network element receives the second handover request from the source access network device, it can also determine whether the target access network device included in the second handover request can provide services to the terminal device, or it can no longer be performed. Judging, this application does not limit this.
  • the first network element After the first network element determines that the selected target access network device can provide services for the terminal device, the first network element sends an N2 handover message to the second network element.
  • the specific implementation method can refer to the prior art, and this application will not Go into details.
  • the source access network device sends a first handover request to the first network element, where the first handover request includes the identification of at least one first candidate access network device and service type information of the terminal device, Then the first network element determines the first capability information used to indicate the service capability of the at least one first candidate access network device, and the first network element determines the capability of the at least one first candidate access network device according to the first capability information. Whether to provide service for the terminal device, if the terminal device cannot be provided with the service, the first network element sends a handover response indicating that the terminal device cannot be provided with the service to the source access network device.
  • the first network element judges whether the first candidate access network device can be the target access network device, which can reduce the complicated signaling interaction between the first network element and the first candidate access network device, and save a lot of money. Signaling resources, and the first network element considers the capability information of the first candidate access network device in the judgment process, which can improve the handover success rate and reliability, thereby improving the handover efficiency.
  • the capability judgment of the access network device is performed by the first network element. In the embodiment of the present application, the judgment may also be performed by the source access network device. For details, refer to the communication method shown in Figure 4 to Figure 6 below.
  • FIG. 4 is a second schematic diagram of the flow of the communication method provided by an embodiment of the application. This communication method can be applied to the communication system shown in FIG. 1 to perform the function of the source access network device. As shown in Figure 4, the communication method includes the following steps:
  • S401 The source access network device determines first capability information.
  • the first capability information is used to indicate the service capability of at least one first candidate access network device.
  • the specific content of the first capability information refer to the above S302, which will not be repeated here.
  • the source access network device determining the first capability information may include the following S501-S505, the source access network device obtaining the first capability information from the first network element, or the following S601-S603 source access The network device obtains the first capability information from the terminal device.
  • the terminal device may send a measurement report to the source access network device.
  • the source access network device can receive the measurement report from the terminal device.
  • the measurement report may include measurement results of at least one access network device, such as signal strength, channel status, and so on.
  • the source access network device selects a target access network device according to the signal strength of the at least one first candidate access network device and the first capability information.
  • the source access network device may select an access network device that can provide a service for the terminal device according to the signal strength of the at least one first candidate access network device and the first capability information.
  • the source access network device can select from at least one first candidate access network device according to the signal strength the access network device whose signal strength meets the terminal device demand, and according to the first capability information from the signal strength to meet the terminal device demand
  • the access network equipment that can provide services for the service type of the terminal equipment is determined from the access network equipment as the target access network equipment.
  • the source access network device can also select the target access network device from the access network devices that can provide services for the service type of the terminal device according to other types of capability information of the access network device. For example, you can According to the current load situation of each access network device, the access network device with the lightest current load is selected as the target access network device, and the access network device with the fastest transmission rate can be selected as the target according to the access bandwidth of the access network device
  • the access network equipment can also comprehensively consider the current load situation of the access network equipment, congestion control strategy, security control strategy, contract status, other management and control strategies, signal strength and other information to determine the target access network equipment.
  • the specific implementation method can be It is set according to actual needs, and this application does not limit it.
  • the access network device that supports all the services requested by the terminal device can be selected first as the target access network device, or the one with the largest number of service types requested by the terminal device can be selected.
  • the target access network device can also be selected according to the priority of the service type. For a specific example, refer to the example of selecting the second candidate access network device in S305, which will not be repeated here.
  • the source access network device sends a handover request to the first network element.
  • the first network element receives the handover request sent by the source access network device.
  • the handover request includes the identification of the target access network device.
  • the source access network device determines the target access network device for the terminal device, it can send a handover request to the first network element.
  • the first network element can directly execute the above S308, and the first network element sends an N2 handover message to the second network element.
  • the first network element may also first determine whether the selected target access network device is reasonable, and if it is reasonable, execute the foregoing S308. If it is unreasonable, the first network element may execute the above S306, and the first network element sends a handover response to the source access network device, instructing the source access network device to reselect the target access network device.
  • the source access network device considers the service capability of the first candidate access network device when determining the target access network device, which can solve the problem that the target access network device selected based on signal strength does not support
  • the service problem of the terminal equipment can improve the handover success rate and reliability, save a large amount of signaling resources, and thereby improve the handover efficiency.
  • the source access network device determining the first capability information may include: the source access network device obtains the first capability information from the first network element. For details, refer to FIG. 5 below. Out of the communication method.
  • the source access network device determining the first capability information may include: the source access network device obtains the first capability information from the terminal device.
  • the source access network device obtains the first capability information from the terminal device.
  • FIG. 5 is a third schematic flowchart of a communication method provided by an embodiment of this application. This communication method may be applicable to the communication between the source access network device and the first network element shown in FIG. 1. As shown in Figure 5, the communication method includes the following steps:
  • the source access network device sends a capability information request to the first network element.
  • the first network element receives the capability information request from the source access network device.
  • the capability information request includes the identification and/or service type information of at least one first candidate access network device, the capability information request is used to request the first capability information, and the service type information is used to indicate the scope of the first capability information.
  • the service type information includes the service type of the terminal device.
  • the specific content included in the service type of the terminal device refer to the foregoing S302, which will not be repeated here.
  • the capability information request may include the identification of the access network device 1 and the identification of the access network device 2, and the source access network device may request all of the access network device 1 and the access network device 2 from the first network element. Service capabilities.
  • the capability information request may include MBS, and the source access network device may request the first network element for the MBS service capability of one or more access network devices for the terminal device.
  • the capability information request may include the identifier of the access network device 1, the identifier of the access network device 2, and the MBS.
  • the source access network device may request the first network element for the MBS of the access network device 1 for the terminal device.
  • Service capability the service capability of the access network device 2 to the MBS of the terminal device.
  • the first network element determines first capability information.
  • the first network element determining the first capability information may include: the first network element determines the first capability information according to known information, and/or the first network element obtains the first capability information from the second network element.
  • Ability information may include: the first network element determines the first capability information according to known information, and/or the first network element obtains the first capability information from the second network element.
  • the foregoing first network element obtains the first capability information from the second network element, which may specifically include the following S503 to S504.
  • S503 The first network element sends a third capability request to the second network element.
  • the second network element receives the third capability request from the first network element.
  • the third capability request may include the identification of at least one first candidate access network device.
  • the identification of at least one first candidate access network device may include the identification of at least one first candidate access network device.
  • the third capability request may include the identification and service type information of at least one first candidate access network device.
  • the identification and service type information may include the identification and service type information of at least one first candidate access network device.
  • the third capability request may include service type information.
  • the first network element may request the MBS service capability of one or more access network devices to the terminal device from the second network element, including access network devices that support MBS and access network devices that do not support MBS. .
  • the second network element sends a third capability response to the first network element.
  • the first network element receives the third capability response from the second network element.
  • the third capability response includes first capability information.
  • the third capability request includes: the identity of the access network device 1, the identity of the access network device 2, and the MBS, the first capability
  • the third capability request includes: the identity of the access network device 1, the identity of the access network device 2, and the MBS, the first capability
  • the first capability information may include: access network device 1, which supports MBS; access Network equipment 2, does not support MBS.
  • the first network element may determine the second capability information, and the second capability information includes at least one capability information of an access network device that can provide a service for the terminal device.
  • the second capability information includes at least one capability information of an access network device that can provide a service for the terminal device.
  • the specific content of the second capability information reference may be made to the specific content of the first capability information in S302, which will not be repeated here.
  • the second capability information is used to determine at least one second candidate access network device, and at least one second candidate access network device is an access network device that can provide services for the terminal device, so that the source access network device
  • the target access network device can be selected from at least one second candidate access network device to avoid selecting the target access network device from the access network devices that cannot provide services for the terminal device, thereby improving the handover success rate and reliability.
  • this application does not limit the implementation manner of the second capability information, and it is subject to the ability to determine at least one second candidate access network device.
  • the first network element sends the first capability information to the source access network device.
  • the source access network device receives the first capability information from the first network element.
  • the first network element may also send the second capability information to the source access network device.
  • the source access network device receives the second capability information from the first network element. That is to say, the first network element can only send the capability information of the access network equipment that supports the service type information to the source access network equipment, exclude the access network equipment that cannot provide services for the terminal equipment, and reduce the target access network equipment. The range of choice to improve switching efficiency.
  • the source access network device selects the target access network device according to the signal strength of the at least one first candidate access network device and the first capability information.
  • the source access network device selects the target access network device according to the signal strength of at least one first candidate access network device and the first capability information for a specific implementation manner of S402, which will not be repeated here.
  • the source access network device may determine the target access network device according to the signal strength and second capability information of the at least one first candidate access network device.
  • the specific implementation manner is the same as that of the source access network device according to the at least one first candidate
  • the signal strength of the access network device is similar to the specific implementation manner of selecting the target access network device by the first capability information, and details are not described herein again.
  • the source access network device obtains first capability information including the service capability of at least one first candidate access network device from the first network element, and according to the at least one first candidate access network device Selecting the target access network device based on the signal strength and first capability information can solve the problem that the target access network device selected only based on the signal strength does not support the service of the terminal device, and can improve the accuracy of the target access network device selection, thereby Improve switching efficiency.
  • FIG. 6 is a fourth flowchart of a communication method provided by an embodiment of this application. This communication method can be applied to the communication between the source access network device and the terminal device shown in FIG. 1. As shown in Figure 6, the communication method includes the following steps:
  • the source access network device sends a capability information request to the terminal device.
  • the terminal device receives the capability information request from the source access network device.
  • the capability information request includes the identification and/or service type information of at least one first candidate access network device, the capability information request is used to request the first capability information, and the service type information is used to indicate the scope of the first capability information.
  • the capability information request refer to the foregoing S501, which will not be repeated here.
  • the capability information request is used to instruct the terminal device to monitor system messages of at least one first candidate access network device and determine the first capability information.
  • the service type information includes the service type of the terminal device.
  • the specific content included in the service type of the terminal device refer to the foregoing S302, which will not be repeated here.
  • the terminal device monitors the system message of at least one first candidate access network device and determines first capability information.
  • the terminal device determines the first capability information according to the capability information request, that is, the terminal device monitors the system message of at least one first candidate access network device according to the instruction of the source access network device, from the monitored system message
  • the first capability information requested by the source access network device is determined in.
  • the terminal device may also monitor system messages of at least one access network device other than the first candidate access network device that the source access network device instructs it to monitor, and determine other access network devices from the monitored system messages.
  • the capability information of the device may be used to determine other access network devices from the monitored system messages.
  • the terminal device sends the first capability information to the source access network device.
  • the source access network device receives the first capability information from the terminal device.
  • the first capability information may also include capability information not requested by the source access network device.
  • capability information not requested by the source access network device.
  • the terminal device can filter out the capability information of the access network device that supports the service type information of the terminal device from the monitored system message, and return it to the source access network device.
  • the source access network device selects a target access network device according to the signal strength of the at least one first candidate access network device and the first capability information.
  • the source access network device selects the target access network device according to the signal strength of at least one first candidate access network device and the first capability information for a specific implementation manner of S402, which is not repeated here.
  • the source access network device obtains first capability information including the service capability of at least one first candidate access network device from the terminal device, and according to the signal of the at least one first candidate access network device Strength and first capability information to select the target access network device can solve the problem that the target access network device selected only based on the signal strength does not support the service of the terminal device, and can improve the accuracy of the target access network device selection, thereby improving handover efficient.
  • the communication method provided by the embodiment of the present application is described in detail above with reference to FIGS. 3 to 6.
  • the communication device provided by the embodiment of the present application will be described in detail below with reference to FIGS. 7-11.
  • FIG. 7 is a second structural diagram of a communication device provided by an embodiment of the present application.
  • the communication device can be applied to the communication system shown in FIG. 1 to perform the function of the first network element in the communication method shown in FIG. 3.
  • FIG. 7 only shows the main components of the communication device.
  • the communication device 700 includes: a transceiver module 701 and a processing module 702.
  • the transceiver module 701 is configured to receive the first handover request from the source access network device.
  • the first handover request includes the identification of at least one first candidate access network device and service type information of the terminal device.
  • the processing module 702 is used to determine the first capability information.
  • the first capability information is used to indicate the service capability of at least one first candidate access network device.
  • the processing module 702 is further configured to determine whether at least one first candidate access network device can provide a service for the terminal device according to the first capability information.
  • the service type of the terminal device may include one or more of the following: capacity reduction, multicast broadcast service, vehicle-connected everything, and non-public network.
  • the first capability information comes from the second network element.
  • the transceiver module 701 is also configured to receive second capability information from the second network element. Wherein, the second capability information is used to determine at least one second candidate access network device.
  • the transceiver module 701 is also used to send a handover response to the source access network device.
  • the handover response may include the identification of at least one second candidate access network device, and the at least one second candidate access network device is determined according to the service type of the terminal device.
  • the transceiver module 701 may include a receiving module and a sending module (not shown in FIG. 7).
  • the receiving module is used to receive data and/or signaling from the source access network device and/or the second network element; the sending module is used to send data and/or signaling to the source access network device and/or the second network element Signaling.
  • This application does not specifically limit the specific implementation of the transceiver module 701.
  • the communication device 700 may further include a storage module (not shown in FIG. 7), and the storage module stores programs or instructions.
  • the processing module 702 executes the program or instruction
  • the communication device 700 can execute the function of the first network element in the communication method shown in FIG. 3.
  • the communication device 700 may be the first network element shown in FIG. 1 or the communication device 200 shown in FIG. 2, such as an access and mobility management function (core access and mobility management function, AMF) network element, It may also be a chip (system) or other components or components that can be installed in the access network device, which is not limited in this application.
  • AMF access and mobility management function
  • AMF core access and mobility management function
  • the technical effects of the communication device 700 shown in FIG. 7 may refer to the technical effects of the communication method shown in FIG. 3, which will not be repeated here.
  • FIG. 8 is a third structural diagram of a communication device provided by an embodiment of the present application.
  • the communication device can be applied to the communication system shown in FIG. 1 to perform the function of the source access network device in the communication method shown in FIG. 3.
  • FIG. 8 only shows the main components of the communication device.
  • the communication device 800 includes: a receiving module 801 and a sending module 802.
  • the sending module 802 is configured to send the first handover request to the first network element.
  • the first handover request includes the identification of at least one first candidate access network device and the service type information of the terminal device.
  • the receiving module 801 is further configured to receive a handover response from the first network element, where the handover response is used to indicate that at least one first candidate access network device cannot provide a service for the terminal device.
  • the service type of the terminal device may include one or more of the following: capacity reduction, multicast broadcast service, vehicle-connected everything, and non-public network.
  • the handover response may include the identification of at least one second candidate access network device, and the at least one second candidate access network device is determined according to the service type of the terminal device.
  • the communication device 800 may further include: a processing module 803.
  • the processing module 803 is configured to determine the target access network device according to the identifier of the at least one second candidate access network device.
  • the sending module 802 is further configured to send a second handover request to the first network element.
  • the second handover request includes the identifier of the target access network device.
  • receiving module 801 and the sending module 802 can be provided separately or integrated into one module, namely the transceiver module (not shown in FIG. 8). This application does not specifically limit the specific implementation of the receiving module 801 and the sending module 802.
  • the communication device 800 may further include a storage module (not shown in FIG. 8), and the storage module stores programs or instructions.
  • the processing module 803 executes the program or instruction
  • the communication apparatus 800 can execute the function of the source access network device in the communication method shown in FIG. 3.
  • the communication device 800 may be the source access network device shown in FIG. 1 or the communication device 200 shown in FIG. Components, this application does not limit this.
  • the technical effect of the communication device 800 shown in FIG. 8 may refer to the technical effect of the communication method shown in FIG. 3, which will not be repeated here.
  • Fig. 9 is a fourth structural diagram of a communication device provided by an embodiment of the present application.
  • the communication device can be applied to the communication system shown in FIG. 1 to perform the function of the source access network device in the communication method shown in FIG. 4.
  • FIG. 9 only shows the main components of the communication device.
  • the communication device 900 includes: a determination module 901 and a selection module 902.
  • the determining module 901 is used to determine the first capability information.
  • the first capability information is used to indicate the service capability of at least one first candidate access network device.
  • the selection module 902 is further configured to select a target access network device according to the signal strength and first capability information of the at least one first candidate access network device.
  • the communication device 900 may further include: a transceiver module 903.
  • the transceiver module 903 is configured to send a capability information request to the first network element or terminal device.
  • the capability information request includes the identification and/or service type information of at least one first candidate access network device, the capability information request is used to request the first capability information, and the service type information is used to indicate the scope of the first capability information.
  • the capability information request is used to instruct the terminal device to monitor system messages of at least one first candidate access network device and determine the first capability information.
  • the service type information may include the service type of the terminal device, and the service type of the terminal device may include one or more of the following: capacity reduction, multicast broadcast service, vehicle-linked everything, and non-public network.
  • the transceiver module 903 may include a receiving module and a sending module (not shown in FIG. 9).
  • the receiving module is used to receive data and/or signaling from the first network element and/or terminal device; the transmitting module is used to send data and/or signaling to the first network element and/or terminal device.
  • This application does not specifically limit the specific implementation of the transceiver module 903.
  • both the determination module 901 and the selection module 902 perform processing functions, which can be set separately or integrated into one module, that is, a processing module (not shown in FIG. 9). This application does not specifically limit the specific implementation of the determination module 901 and the selection module 902.
  • the communication device 900 may further include a storage module (not shown in FIG. 9), and the storage module stores programs or instructions.
  • the processing module executes the program or instruction
  • the communication apparatus 900 can perform the functions of the source access network device in the communication methods shown in FIG. 4, FIG. 5, and FIG. 6.
  • the communication device 900 may be the source access network device shown in FIG. 1 or the communication device 200 shown in FIG. Components, this application does not limit this.
  • the technical effects of the communication device 900 shown in FIG. 9 may refer to the technical effects of the communication methods shown in FIG. 4, FIG. 5, and FIG. 6, which will not be repeated here.
  • FIG. 10 is a fifth structural diagram of a communication device provided by an embodiment of the present application.
  • the communication device can be applied to the communication system shown in FIG. 1 to perform the function of the first network element in the communication method shown in FIG. 5.
  • FIG. 10 only shows the main components of the communication device.
  • the communication device 1000 includes: a receiving module 1001 and a sending module 1002.
  • the receiving module 1001 is configured to receive a capability information request from a source access network device.
  • the capability information request includes the identification and/or service type information of at least one first candidate access network device, the capability information request is used to request the first capability information, and the service type information is used to indicate the scope of the first capability information.
  • the sending module 1002 is configured to send the first capability information to the source access network device.
  • the first capability information comes from the second network element.
  • the receiving module 1001 is also used to receive the second capability information from the second network element.
  • the second capability information is used to determine at least one second candidate access network device.
  • the service type information may include the service type of the terminal device, and the service type of the terminal device may include one or more of the following: capacity reduction, multicast broadcast service, vehicle-linked everything, and non-public network.
  • the receiving module 1001 and the sending module 1002 can be provided separately or integrated into one module, namely the transceiver module (not shown in FIG. 10). This application does not specifically limit the specific implementation of the receiving module 1001 and the sending module 1002.
  • the communication device 1000 may further include a processing module 1003 and a storage module (not shown in FIG. 10), and the storage module stores programs or instructions.
  • the processing module 1003 executes the program or instruction
  • the communication device 1000 can execute the function of the first network element in the communication method shown in FIG. 5.
  • the communication device 1000 may be the first network element shown in FIG. 1 or the communication device 200 shown in FIG. This application does not limit this.
  • the technical effect of the communication device 1000 shown in FIG. 10 may refer to the technical effect of the communication method shown in FIG. 5, which will not be repeated here.
  • FIG. 11 is a sixth structural diagram of a communication device provided by an embodiment of the present application.
  • the communication device can be applied to the communication system shown in FIG. 1 to perform the functions of the terminal device in the communication method shown in FIG. 6.
  • FIG. 11 only shows the main components of the communication device.
  • the communication device 1100 includes: a receiving module 1101 and a sending module 1102.
  • the receiving module 1101 is configured to receive a capability information request from the source access network device.
  • the capability information request includes the identification and/or service type information of at least one first candidate access network device, the capability information request is used to request the first capability information, and the service type information is used to indicate the scope of the first capability information.
  • the sending module 1102 is also used to send the first capability information to the source access network device.
  • the communication device 1100 may further include: a processing module 1103.
  • the processing module 1103 is configured to monitor system messages of at least one first candidate access network device and determine the first capability information.
  • the service type information may include the service type of the communication device 1100, and the service type of the communication device 1100 may include one or more of the following: capacity reduction, multicast broadcast service, vehicle-linked everything, and non-public network.
  • receiving module 1101 and the sending module 1102 can be provided separately or integrated into one module, namely the transceiver module (not shown in FIG. 11). This application does not specifically limit the specific implementation of the receiving module 1101 and the sending module 1102.
  • the communication device 1100 may further include a storage module (not shown in FIG. 11, the storage module stores a program or instruction.
  • the processing module 1103 executes the program or instruction
  • the communication device 1100 can execute the program or instruction shown in FIG. 6 The function of the terminal device in the communication method.
  • the communication device 1100 may be the terminal device shown in FIG. 1 or the communication device 200 shown in FIG. Not limited.
  • the technical effect of the communication device 1100 shown in FIG. 11 may refer to the technical effect of the communication method shown in FIG. 6, which will not be repeated here.
  • the embodiment of the present application provides a communication system.
  • the system includes a first network element, source access network equipment, target access network equipment, and terminal equipment.
  • the first network element may be an AMF network element.
  • the system may also include a second network element, such as an AMF network element, a UDM network element, and an OAM network element.
  • the embodiment of the present application provides a computer-readable storage medium, including: the computer-readable storage medium includes a computer program or instruction; when the computer program or instruction runs on a computer, the computer is caused to execute the method described in the foregoing method embodiment Communication method.
  • the embodiment of the present application provides a computer program product, including a computer program or instruction, when the computer program or instruction runs on a computer, the computer is caused to execute the communication method described in the foregoing method embodiment.
  • the processor in the embodiment of the present application may be a central processing unit (central processing unit, CPU), and the processor may also be other general-purpose processors, digital signal processors (digital signal processors, DSP), and dedicated integration Circuit (application specific integrated circuit, ASIC), ready-made programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc.
  • the general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like.
  • the memory in the embodiments of the present application may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory may be read-only memory (ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), and electrically accessible Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory.
  • the volatile memory may be random access memory (RAM), which is used as an external cache.
  • RAM random access memory
  • static random access memory static random access memory
  • DRAM dynamic random access memory
  • DRAM synchronous dynamic random access memory
  • Access memory synchronous DRAM, SDRAM
  • double data rate synchronous dynamic random access memory double data rate SDRAM, DDR SDRAM
  • enhanced synchronous dynamic random access memory enhanced SDRAM, ESDRAM
  • synchronous connection dynamic random access memory Take memory (synchlink DRAM, SLDRAM) and direct memory bus random access memory (direct rambus RAM, DR RAM).
  • the foregoing embodiments may be implemented in whole or in part by software, hardware (such as circuits), firmware, or any other combination.
  • the above-mentioned embodiments may be implemented in the form of a computer program product in whole or in part.
  • the computer program product includes one or more computer instructions or computer programs.
  • the processes or functions described in the embodiments of the present application are generated in whole or in part.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium.
  • the computer instructions may be transmitted from a website, computer, server, or data center. Transmission to another website, computer, server or data center via wired (such as infrared, wireless, microwave, etc.).
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or a data center that includes one or more sets of available media.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium.
  • the semiconductor medium may be a solid state drive.
  • At least one refers to one or more, and “multiple” refers to two or more.
  • the following at least one item (a)” or similar expressions refers to any combination of these items, including any combination of a single item (a) or a plurality of items (a).
  • at least one item (a) of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple .
  • the size of the sequence number of the above-mentioned processes does not mean the order of execution, and the execution order of each process should be determined by its function and internal logic, and should not correspond to the embodiments of the present application.
  • the implementation process constitutes any limitation.
  • the disclosed system, device, and method can be implemented in other ways.
  • the above-described device embodiments are only illustrative.
  • the division of the above-mentioned units or modules is only a logical function division.
  • there may be other division methods for example, multiple units or modules may be combined.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units/modules, and may be in electrical, mechanical or other forms.
  • the units/modules described as separate parts may or may not be physically separated, and the parts displayed as units/modules may or may not be physical units/modules, that is, they may be located in one place, or they may be distributed to Multiple network units/modules. Some or all of the units/modules can be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
  • each functional unit/module in each embodiment of the present application can be integrated into one processing unit/module, or each unit/module can exist alone physically, or two or more units/modules can be integrated into one. Unit/module.
  • the function is implemented in the form of a software function unit/module and sold or used as an independent product, it can be stored in a computer readable storage medium.
  • the technical solution of the present application essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (read-only memory, ROM), random access memory (random access memory, RAM), magnetic disks or optical disks and other media that can store program codes. .

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Abstract

本申请提供一种通信方法及通信装置，能够解决接入网设备与核心网之间的接口进行切换的过程中，目标接入网设备选择不合理的问题，并提升资源利用率和切换效率。该方法包括：第一网元接收来自源接入网设备的第一切换请求，确定第一能力信息，并根据第一能力信息确定至少一个第一候选接入网设备能否为终端设备提供服务，若不能为终端设备提供服务，第一网元向源接入网设备发送的切换响应中包括能够为终端设备提供服务的至少一个第二候选接入网设备的标识。其中，第一切换请求包括至少一个第一候选接入网设备的标识和终端设备的业务类型信息，切换响应用于指示至少一个第一候选接入网设备是否能为终端设备提供服务。

Description

通信方法及通信装置
本申请要求于2020年03月31日提交国家知识产权局、申请号为202010247497.2、申请名称为“通信方法及通信装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信领域，尤其涉及一种通信方法及通信装置。
背景技术
在终端设备移动的过程中，终端设备正在连接的接入网设备(即源接入网设备)为终端设备选择目标接入网设备。若源接入网设备和目标接入网设备之间没有直接相连的接口，如X2接口或Xn接口，则可以利用接入网设备与核心网之间的接口，如S1接口或N2接口进行切换。具体过程为：源接入网设备根据其它接入网设备的信号强度选择目标接入网设备，并通过核心网向目标接入网设备发送切换请求，然后通过核心网从目标接入网设备接收切换响应。若目标接入网设备能够为终端设备提供服务，则源接入网设备可以向终端设备发送切换响应中包括的无线资源的配置信息，以便终端设备接入目标接入网设备。也就是说，上述切换流程涉及接入网设备与核心网之间的复杂的信令交互，信令开销较大。
然而，随着终端设备的业务类型和接入网设备能力的多样化，仅根据信号强度选择的目标接入网设备可能不支持该终端设备的业务的情况，即目标接入网设备选择不合理，上述切换流程的成功率低下，从而导致需要多次执行上述切换流程方能切换成功，浪费了大量的信令资源，切换效率低，甚至多次执行上述切换流程也可能切换失败，最终导致终端设备的通信中断。
发明内容
本申请实施例提供一种通信方法及通信装置，能够提升目标基站选择准确性，提升切换效率。
为达到上述目的，本申请采用如下技术方案：
第一方面，提供一种通信方法。该通信方法包括：接收来自源接入网设备的第一切换请求，确定第一能力信息，根据第一能力信息，确定至少一个第一候选接入网设备能否为终端设备提供服务。其中，第一切换请求包括至少一个第一候选接入网设备的标识和终端设备的业务类型信息，第一能力信息用于指示至少一个第一候选接入网设备的服务能力。
基于第一方面至下述第二方面所述的通信方法，第一网元接收来自源接入网设备的第一切换请求，该第一切换请求包括至少一个第一候选接入网设备的标识和终端设备的业务类型信息，然后确定用于指示至少一个第一候选接入网设备的服务能力的第一能力信息，并由第一网元根据该第一能力信息确定至少一个第一候选接入网设备能否为终端设备提供服务，若不能为终端设备提供服务，第一网元向源接入网设备发送 指示不能为终端设备提供服务的切换响应。如此，由第一网元判断第一候选接入网设备能否作为合法的目标接入网设备，可以减少第一网元与第一候选接入网设备之间的复杂的信令交互，节省大量的信令资源，并且第一网元在判断过程中考虑了第一候选接入网设备的能力信息，可以提高切换成功率和可靠性，从而提高切换效率。
可选地，终端设备的业务类型可以包括如下一项或多项：能力降低(reduced capablity，REDCAP)、多播广播服务(multicast broadcast service，MBS)、车联万物(vehicle-to-everything，V2X)、非公共网络(non-public network，NPN)。
可选地，第一能力信息来自第二网元。也就是说，第一网元可以确定自身是否有第一能力信息，若没有或缺少部分第一候选接入网设备的第一能力信息，可以与第二网元进行交互，以获得第一能力信息。
在一种可能的设计方案中，第一方面所述的通信方法还可以包括：接收来自第二网元的第二能力信息。其中，第二能力信息用于确定至少一个第二候选接入网设备。也就是说，第一网元还可以与第二网元交互，获得第二能力信息，从而为源接入网设备提供至少一个第二候选接入网设备。
在一种可能的设计方案中，第一方面所述的通信方法还可以包括：向源接入网设备发送切换响应。其中，切换响应包括至少一个第二候选接入网设备的标识，至少一个第二候选接入网设备是根据终端设备的业务类型确定的。也就是说，第一网元判断目标接入网设备选择不合理后，可以向源接入网设备提供建议的目标接入网设备列表，即至少一个第二候选接入网设备，以供源接入网设备重新选择目标接入网设备，从而进一步提高切换效率。
第二方面，提供一种通信方法。该通信方法包括：向第一网元发送第一切换请求，并接收来自第一网元的切换响应。其中，第一切换请求包括至少一个第一候选接入网设备的标识和终端设备的业务类型信息，切换响应用于指示至少一个第一候选接入网设备不能为终端设备提供服务。
可选地，终端设备的业务类型可以包括如下一项或多项：能力降低、多播广播服务、车联万物、非公共网络。
可选地，切换响应可以包括至少一个第二候选接入网设备的标识，至少一个第二候选接入网设备是根据终端设备的业务类型确定的。也就是说，源接入网设备可以接收第一网元建议的支持终端设备的业务的至少一个第二候选接入网设备。
在一种可能的设计方案中，第二方面所述的通信方法还可以包括：根据至少一个第二候选接入网设备的标识确定目标接入网设备。如此，源接入网设备可以从第一网元建议的至少一个第二候选接入网设备中选择目标接入网设备，可以提高终端设备切换的成功率。
在一种可能的设计方案中，第二方面所述的通信方法还可以包括：向第一网元发送第二切换请求。其中，第二切换请求包括目标接入网设备的标识。如此，第一切换请求失败后，源接入网设备还可以向第一网元发送第二切换请求，目标接入网设备是从能够支持终端设备的业务类型对应的业务的至少一个第二候选接入网设备中选择的，可以提高切换成功率，进而提高切换效率。
第三方面，提供一种通信方法。该通信方法包括：确定第一能力信息，根据至少 一个第一候选接入网设备的信号强度和第一能力信息选择目标接入网设备。其中，第一能力信息用于指示至少一个第一候选接入网设备的服务能力。
基于第三方面至下述第五方面所述的通信方法，源接入网设备在确定目标接入网设备时考虑了第一候选接入网设备的服务能力，可以解决仅根据信号强度选择的目标接入网设备不支持该终端设备的业务的问题，可以提高切换成功率和可靠性，节省大量的信令资源，从而提高切换效率。
可选地，上述确定第一能力信息，包括：向第一网元或终端设备发送能力信息请求。其中，能力信息请求可以包括至少一个第一候选接入网设备的标识和/或业务类型信息，能力信息请求用于请求第一能力信息，业务类型信息用于指示第一能力信息的范围。如此，源接入网设备获得第一能力信息的方法有：从第一网元获得第一能力信息、从终端设备获得第一能力信息。
可选地，能力信息请求用于指示终端设备监听至少一个第一候选接入网设备的系统消息并确定第一能力信息。
可选地，业务类型信息可以包括终端设备的业务类型，终端设备的业务类型可以包括如下一项或多项：能力降低、多播广播服务、车联万物、非公共网络。
第四方面，提供一种通信方法。该通信方法包括：第一网元接收来自源接入网设备的能力信息请求，并向源接入网设备发送第一能力信息。其中，能力信息请求包括至少一个第一候选接入网设备的标识和/或业务类型信息，能力信息请求用于请求第一能力信息，业务类型信息用于指示第一能力信息的范围。
可选地，第一能力信息来自第二网元。也就是说，第一网元可以确定自身是否有第一能力信息，若没有或缺少部分第一候选接入网设备的第一能力信息，可以与第二网元进行交互，以获得第一能力信息。
在一种可能的设计方案中，第四方面所述的通信方法还可以包括：第一网元接收来自第二网元的第二能力信息。其中，第二能力信息用于确定至少一个第二候选接入网设备。也就是说，第一网元还可以与第二网元交互，获得第二能力信息，从而为源接入网设备提供至少一个第二候选接入网设备。
可选地，业务类型信息可以包括终端设备的业务类型，终端设备的业务类型可以包括如下一项或多项：能力降低、多播广播服务、车联万物、非公共网络。
第五方面，提供一种通信方法。该通信方法包括：终端设备接收来自源接入网设备的能力信息请求，并向源接入网设备发送第一能力信息。其中，能力信息请求包括至少一个第一候选接入网设备的标识和/或业务类型信息，能力信息请求用于请求第一能力信息，业务类型信息用于指示第一能力信息的范围。
在一种可能的设计方案中，第五方面所述的通信方法还可以包括：终端设备监听至少一个第一候选接入网设备的系统消息并确定第一能力信息。如此，终端设备可以通过监听若干小区的系统消息获取第一能力信息。
可选地，业务类型信息可以包括终端设备的业务类型，终端设备的业务类型可以包括如下一项或多项：能力降低、多播广播服务、车联万物、非公共网络。
第六方面，提供一种通信装置。该通信装置包括：收发模块和处理模块。其中，收发模块，用于接收来自源接入网设备的第一切换请求。其中，第一切换请求包括至 少一个第一候选接入网设备的标识和终端设备的业务类型信息。处理模块，用于确定第一能力信息。其中，第一能力信息用于指示至少一个第一候选接入网设备的服务能力。处理模块，还用于根据第一能力信息，确定至少一个第一候选接入网设备能否为终端设备提供服务。
可选地，终端设备的业务类型可以包括如下一项或多项：能力降低、多播广播服务、车联万物、非公共网络。
可选地，第一能力信息来自第二网元。
在一种可能的设计方案中，收发模块，还用于接收来自第二网元的第二能力信息。其中，第二能力信息用于确定至少一个第二候选接入网设备。
在一种可能的设计方案中，收发模块，还用于向源接入网设备发送切换响应。其中，切换响应可以包括至少一个第二候选接入网设备的标识，至少一个第二候选接入网设备是根据终端设备的业务类型确定的。
需要说明的是，第六方面所述的收发模块可以包括接收模块和发送模块。其中，接收模块用于接收来自源接入网设备和/或第二网元的数据和/或信令；发送模块用于向源接入网设备和/或第二网元发送数据和/或信令。本申请对于收发模块的具体实现方式，不做具体限定。
可选地，第六方面所述的通信装置还可以包括存储模块，该存储模块存储有程序或指令。当处理模块执行该程序或指令时，使得第六方面所述的通信装置可以执行第一方面所述的方法。
需要说明的是，第六方面所述的通信装置可以是第一网元，如接入和移动性管理功能(core access and mobility management function，AMF)网元，也可以是可设置于接入网设备的芯片(系统)或其他部件或组件，本申请对此不做限定。
此外，第六方面所述的通信装置的技术效果可以参考第一方面中任一种可能的实现方式所述的通信方法的技术效果，此处不再赘述。
第七方面，提供一种通信装置。该通信装置包括：接收模块和发送模块。其中，发送模块，用于向第一网元发送第一切换请求。其中，第一切换请求包括至少一个第一候选接入网设备的标识和终端设备的业务类型信息。接收模块，还用于接收来自第一网元的切换响应，切换响应用于指示至少一个第一候选接入网设备不能为终端设备提供服务。
可选地，终端设备的业务类型可以包括如下一项或多项：能力降低、多播广播服务、车联万物、非公共网络。
可选地，切换响应可以包括至少一个第二候选接入网设备的标识，至少一个第二候选接入网设备是根据终端设备的业务类型确定的。
在一种可能的设计方案中，第七方面所述的通信装置还可以包括：处理模块。其中，处理模块，用于根据至少一个第二候选接入网设备的标识确定目标接入网设备。
在一种可能的设计方案中，发送模块，还用于向第一网元发送第二切换请求。其中，第二切换请求包括目标接入网设备的标识。
需要说明的是，接收模块和发送模块可以分开设置，也可以集成在一个模块中，即收发模块。本申请对于接收模块和发送模块的具体实现方式，不做具体限定。
可选地，第七方面所述的通信装置还可以包括存储模块，该存储模块存储有程序或指令。当处理模块执行该程序或指令时，使得第七方面所述的通信装置可以执行第二方面所述的方法。
需要说明的是，第七方面所述的通信装置可以是源接入网设备，也可以是可设置于源接入网设备的芯片(系统)或其他部件或组件，本申请对此不做限定。
此外，第七方面所述的通信装置的技术效果可以参考第二方面中任一种可能的实现方式所述的通信方法的技术效果，此处不再赘述。
第八方面，提供一种通信装置。该通信装置包括：处理模块。其中，确定模块和选择模块，用于确定第一能力信息。其中，第一能力信息用于指示至少一个第一候选接入网设备的服务能力。选择模块，用于根据至少一个第一候选接入网设备的信号强度和第一能力信息选择目标接入网设备。
在一种可能的设计方案中，第八方面所述的通信装置还可以包括：收发模块。其中，收发模块，用于向第一网元或终端设备发送能力信息请求。其中，能力信息请求包括至少一个第一候选接入网设备的标识和/或业务类型信息，能力信息请求用于请求第一能力信息，业务类型信息用于指示第一能力信息的范围。
可选地，能力信息请求用于指示终端设备监听至少一个第一候选接入网设备的系统消息并确定第一能力信息。
可选地，业务类型信息可以包括终端设备的业务类型，终端设备的业务类型可以包括如下一项或多项：能力降低、多播广播服务、车联万物、非公共网络。
可选地，第八方面所述的收发模块可以包括接收模块和发送模块。其中，接收模块用于接收来自第一网元和/或终端设备的数据和/或信令；发送模块用于向第一网元和/或终端设备发送数据和/或信令。本申请对于收发模块的具体实现方式，不做具体限定。
需要说明的是，第八方面所述的确定模块和选择模块执行的都是处理功能，可以分开设置，也可以集成在一个模块中，即处理模块。本申请对于确定模块和选择模块的具体实现方式，不做具体限定。
可选地，第八方面所述的通信装置还可以包括存储模块，该存储模块存储有程序或指令。当处理模块执行该程序或指令时，使得第八方面所述的通信装置可以执行第三方面所述的方法。
需要说明的是，第八方面所述的通信装置可以是源接入网设备，也可以是可设置于源接入网设备的芯片(系统)或其他部件或组件，本申请对此不做限定。
此外，第八方面所述的通信装置的技术效果可以参考第三方面中任一种可能的实现方式所述的通信方法的技术效果，此处不再赘述。
第九方面，提供一种通信装置。该通信装置包括：接收模块和发送模块。其中，接收模块，用于接收来自源接入网设备的能力信息请求。其中，能力信息请求包括至少一个第一候选接入网设备的标识和/或业务类型信息，能力信息请求用于请求第一能力信息，业务类型信息用于指示第一能力信息的范围。发送模块，用于向源接入网设备发送第一能力信息。
可选地，第一能力信息来自第二网元。
在一种可能的设计方案中，接收模块，还用于接收来自第二网元的第二能力信息。其中，第二能力信息用于确定至少一个第二候选接入网设备。
可选地，业务类型信息可以包括终端设备的业务类型，终端设备的业务类型可以包括如下一项或多项：能力降低、多播广播服务、车联万物、非公共网络。
需要说明的是，接收模块和发送模块可以分开设置，也可以集成在一个模块中，即收发模块。本申请对于接收模块和发送模块的具体实现方式，不做具体限定。
可选地，第九方面所述的通信装置还可以包括处理模块和存储模块，该存储模块存储有程序或指令。当处理模块执行该程序或指令时，使得第九方面所述的通信装置可以执行第四方面所述的方法。
需要说明的是，第九方面所述的通信装置可以是第一网元，也可以是可设置于第一网元的芯片(系统)或其他部件或组件，本申请对此不做限定。
第九方面所述的通信装置的技术效果可以参考第四方面中任一种可能的实现方式所述的通信方法的技术效果，此处不再赘述。
第十方面，提供一种通信装置。该通信装置包括：接收模块和发送模块。其中，接收模块，用于接收来自源接入网设备的能力信息请求。其中，能力信息请求包括至少一个第一候选接入网设备的标识和/或业务类型信息，能力信息请求用于请求第一能力信息，业务类型信息用于指示第一能力信息的范围。发送模块，还用于向源接入网设备发送第一能力信息。
在一种可能的设计方案中，第十方面所述的通信装置还可以包括：处理模块。其中，处理模块，用于监听至少一个第一候选接入网设备的系统消息并确定第一能力信息。
可选地，业务类型信息可以包括通信装置的业务类型，通信装置的业务类型可以包括如下一项或多项：能力降低、多播广播服务、车联万物、非公共网络。
需要说明的是，接收模块和发送模块可以分开设置，也可以集成在一个模块中，即收发模块。本申请对于接收模块和发送模块的具体实现方式，不做具体限定。
可选地，第十方面所述的通信装置还可以包括存储模块，该存储模块存储有程序或指令。当处理模块执行该程序或指令时，使得第十方面所述的通信装置可以执行第五方面所述的方法。
需要说明的是，第十方面所述的通信装置可以是终端设备，也可以是可设置于终端设备的芯片(系统)或其他部件或组件，本申请对此不做限定。
此外，第十方面所述的通信装置的技术效果可以参考第五方面中任一种可能的实现方式所述的通信方法的技术效果，此处不再赘述。
第十一方面，提供一种通信装置。该通信装置包括：处理器和通信接口。该处理器用于通过通信接口与其它装置通信，并执行如第一方面至第五方面中任意一种可能的实现方式所述的通信方法。该通信接口可以是收发电路，用于该通信装置与其他通信装置通信。
在一种可能的设计中，第十一方面所述的通信装置还可以包括存储器。该存储器用于存储计算机程序。所述收发器可以用于该通信装置与其他通信装置通信。
在本申请中，第十一方面所述的通信装置可以为第一网元或源接入网设备或终端 设备，或者可设置于第一网元或源接入网设备或终端设备的芯片(系统)或其他部件或组件。
此外，第十一方面所述的通信装置的技术效果可以参考第一方面至第五方面中的任意一种实现方式所述的通信方法的技术效果，此处不再赘述。
第十二方面，提供一种通信系统。该系统包括第一网元、源接入网设备、目标接入网设备、终端设备。其中，第一网元可以是AMF网元。可选地，该系统还可以包括第二网元，如AMF网元，统一数据管理(unified data management，UDM)网元，操作、管理和维护(operations,administration and maintenance，OAM)网元。
第十三方面，提供一种计算机可读存储介质，包括：该计算机可读存储介质包括计算机程序或指令；当该计算机程序或指令在计算机上运行时，使得该计算机执行第一方面至第五方面中任意一种可能的实现方式所述的通信方法。
第十四方面，提供一种计算机程序产品，包括计算机程序或指令，当该计算机程序或指令在计算机上运行时，使得该计算机执行第一方面至第五方面中任意一种可能的实现方式所述的通信方法。
附图说明
图1为本申请实施例提供的通信系统的架构示意图；
图2为本申请实施例提供的通信装置的结构示意图一；
图3为本申请实施例提供的通信方法的流程示意图一；
图4为本申请实施例提供的通信方法的流程示意图二；
图5为本申请实施例提供的通信方法的流程示意图三；
图6为本申请实施例提供的通信方法的流程示意图四；
图7为本申请实施例提供的通信装置的结构示意图二；
图8为本申请实施例提供的通信装置的结构示意图三；
图9为本申请实施例提供的通信装置的结构示意图四；
图10为本申请实施例提供的通信装置的结构示意图五；
图11为本申请实施例提供的通信装置的结构示意图六。
具体实施方式
下面将结合附图，对本申请中的技术方案进行描述。
本申请实施例的技术方案可以应用于各种通信系统，例如无线保真(wireless fidelity，WiFi)系统，车到任意物体(vehicle to everything，V2X)通信系统、设备间(device-todevie，D2D)通信系统、车联网通信系统、第4代(4th generation，4G)移动通信系统，如长期演进(long term evolution，LTE)系统、全球互联微波接入(worldwide interoperability for microwave access，WiMAX)通信系统、第五代(5th generation，5G)移动通信系统，如新空口(new radio，NR)系统，以及未来的通信系统，如第六代(6th generation，6G)移动通信系统等。
本申请将围绕可包括多个设备、组件、模块等的系统来呈现各个方面、实施例或特征。应当理解和明白的是，各个系统可以包括另外的设备、组件、模块等，并且/或者可以并不包括结合附图讨论的所有设备、组件、模块等。此外，还可以使用这些方案的组合。
另外，在本申请实施例中，“示例地”、“例如”等词用于表示作例子、例证或说明。本申请中被描述为“示例”的任何实施例或设计方案不应被解释为比其它实施例或设计方案更优选或更具优势。确切而言，使用示例的一词旨在以具体方式呈现概念。
本申请实施例中，“信息(information)”，“信号(signal)”，“消息(message)”，“信道(channel)”、“信令(singalling)”有时可以混用，应当指出的是，在不强调其区别时，其所要表达的含义是一致的。“的(of)”，“相应的(corresponding，relevant)”和“对应的(corresponding)”有时可以混用，应当指出的是，在不强调其区别时，其所要表达的含义是一致的。
本申请实施例描述的网络架构以及业务场景是为了更加清楚的说明本申请实施例的技术方案，并不构成对于本申请实施例提供的技术方案的限定，本领域普通技术人员可知，随着网络架构的演变和新业务场景的出现，本申请实施例提供的技术方案对于类似的技术问题，同样适用。
图1为本申请实施例提供的通信方法所适用的一种通信系统的架构示意图。为便于理解本申请实施例，首先以图1中示出的通信系统为例详细说明适用于本申请实施例的通信系统。应当指出的是，本申请实施例中的方案还可以应用于其他移动通信系统中，相应的名称也可以用其他移动通信系统中的对应功能的名称进行替代。
如图1所示，该通信系统包括第一网元、源接入网设备、目标接入网设备和终端设备。可选地，该通信系统还可以包括第二网元。
其中，上述第一网元为位于上述通信系统的网络侧，且为终端设备提供网络服务的设备或可设置于该设备的芯片(系统)或其他部件或组件。该第一网元可以为核心网网元，如接入和移动性管理功能(core access and mobility management function，AMF)网元。
上述第二网元为位于上述通信系统的网络侧，且可以与第一网元通信的设备或可设置于该设备的芯片(系统)或其他部件或组件。该第二网元可以为核心网网元，如AMF网元或统一数据管理(unified data management，UDM)网元。该第二网元还可以为其它网元，如操作、管理和维护(operations,administration and maintenance，OAM)网元。
需要说明的是，当第一网元和第二网元均为AMF网元时，第一网元和第二网元可以为同一个AMF网元，即源接入网设备和目标接入网设备均为同一个AMF网元管理的接入网设备，也可以是不同的AMF网元，即源接入网设备和目标接入网设备是由不同的AMF网元管理的。
上述源接入网设备、目标接入网设备也可以统称为接入网设备。接入网设备为位于上述通信系统的网络侧，且具有无线收发功能的设备或可设置于该设备的芯片(系统)或其他部件或组件。接入网设备包括但不限于：无线保真(wireless fidelity，WiFi)系统中的接入点(access point，AP)，如家庭网关、路由器、服务器、交换机、网桥等，演进型节点B(evolved Node B，eNB)、无线网络控制器(radio network controller，RNC)、节点B(Node B，NB)、基站控制器(base station controller，BSC)、基站收发台(base transceiver station，BTS)、家庭基站(例如，home evolved NodeB，或home Node B，HNB)、基带单元(baseband unit，BBU)，无线中继节点、无线回传 节点、传输点(transmission and reception point，TRP或者transmission point，TP)等，还可以为5G，如，新空口(new radio，NR)系统中的gNB，或，传输点(TRP或TP)，5G系统中的基站的一个或一组(包括多个天线面板)天线面板，或者，还可以为构成gNB或传输点的网络节点，如基带单元(BBU)，或，分布式单元(distributed unit，DU)、具有基站功能的路边单元(road side unit，RSU)等。
本申请实施例中，上述OAM网元也可以称之为OAM设备。进一步地，上述AMF网元、UDM网元、OAM网元、接入网设备也可以统称为网络设备，本申请实施例对上述第一网元、第二网元的具体名称，不做具体限定。
上述终端设备为接入上述通信系统，且具有无线收发功能的终端或可设置于该终端的芯片(系统)或其他部件或组件。该终端设备也可以称为用户装置、接入终端、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端、无线通信设备、用户代理或用户装置。本申请的实施例中的终端设备可以是手机(mobile phone)、平板电脑(Pad)、带无线收发功能的电脑、虚拟现实(virtual reality，VR)终端设备、增强现实(augmented reality，AR)终端设备、工业控制(industrial control)中的无线终端、无人驾驶(self driving)中的无线终端、远程医疗(remote medical)中的无线终端、智能电网(smart grid)中的无线终端、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端、智慧家庭(smart home)中的无线终端、车载终端、具有终端功能的RSU等。本申请的终端设备还可以是作为一个或多个部件或者单元而内置于车辆的车载模块、车载模组、车载部件、车载芯片或者车载单元，车辆通过内置的所述车载模块、车载模组、车载部件、车载芯片或者车载单元可以实施本申请提供的通信方法。
需要说明的是，本申请实施例提供的通信方法，可以适用于图1所示的源接入网设备与第一网元之间的通信。可选地，该通信方法还可以用于图1所示的源接入网设备与终端设备之间的通信。
应理解，图1仅为便于理解而示例的简化示意图，该通信系统中还可以包括其他网络设备，和/或，其他终端设备，图1中未予以画出。
图2为可用于执行本申请实施例提供的通信方法的通信装置的结构示意图一。该通信装置可以是第一网元，也可以是可应用于第一网元的芯片(系统)或其他部件或组件。或者，该通信装置可以是源接入网设备，也可以是可应用于源接入网设备的芯片(系统)或其他部件或组件。或者，该通信装置还可以是终端设备，也可以是可应用于终端设备的芯片(系统)或其他部件或组件。
如图2所示，通信装置200包括处理器201和通信接口202。其中，处理器201可以与通信接口202集成在一起，也可以独立存在。可选地，通信装置200还可以包括存储器203，存储器203可以和处理器201集成在一起，也可以独立存在，本申请实施例对此不作具体限定。
下面结合图2对通信装置200的各个构成部件进行具体的介绍：
处理器201是通信装置200的控制中心，可以是一个处理器，也可以是多个处理元件的统称。例如，处理器201是一个或多个中央处理器(central processing unit，CPU)，也可以是特定集成电路(application specific integrated circuit，ASIC)，或者是被配置 成实施本申请实施例的一个或多个集成电路，例如：一个或多个微处理器(digital signal processor，DSP)，或，一个或者多个现场可编程门阵列(field programmable gate array，FPGA)。
其中，处理器201可以通过运行或执行存储在存储器203内的软件程序，以及调用存储在存储器203内的数据，执行通信装置200的各种功能。
在具体实现中，作为一种实施例，处理器201可以包括一个或多个CPU，例如图2中所示的CPU0和CPU1。
在具体实现中，作为一种实施例，通信装置200也可以包括多个处理器，例如图2中所示的处理器201和处理器204。这些处理器中的每一个可以是一个单核处理器(single-CPU)，也可以是一个多核处理器(multi-CPU)。这里的处理器可以指一个或多个通信设备、电路、和/或用于处理数据(例如计算机程序指令)的处理核。
存储器203可以是只读存储器(read-only memory，ROM)或可存储静态信息和指令的其他类型的静态存储通信设备，随机存取存储器(random access memory，RAM)或者可存储信息和指令的其他类型的动态存储通信设备，也可以是电可擦可编程只读存储器(electrically erasable programmable read-only memory，EEPROM)、只读光盘(compact disc read-only memory，CD-ROM)或其他光盘存储、光碟存储(包括压缩光碟、激光碟、光碟、数字通用光碟、蓝光光碟等)、磁盘存储介质或者其他磁存储通信设备、或者能够用于携带或存储具有指令或数据结构形式的期望的程序代码并能够由计算机存取的任何其他介质，但不限于此。
其中，所述存储器203用于存储执行本申请方案的软件程序，并由处理器201来控制执行。上述具体实现方式可以参考下述方法实施例，此处不再赘述。
通信接口202，可以是收发电路，用于与其他通信装置之间的通信。例如，通信装置200为第一网元，通信接口202可以用于与源接入网设备通信，或者与第二网元通信。又例如，通信装置200为源接入网设备，通信接口202可以用于与终端设备通信，或者与第一网元通信。再例如，通信装置200为终端设备，通信接口202可以用于与源接入网设备通信。此外，所述收发电路可以是收发器、收发机一类的装置。通信接口202也可以是处理器201的输入/输出(input/output，I/O)电路，用以实现处理器201的信号输入和信号输出。
需要说明的是，图2中示出的通信装置200的结构并不构成对该通信装置的限定，实际的通信装置可以包括比图示更多或更少的部件，或者组合某些部件，或者不同的部件布置。
下面将结合图3-图6对本申请实施例提供的通信方法进行具体阐述。
图3为本申请实施例提供的通信方法的流程示意图一。该通信方法可以适用于图1所示的第一网元与源接入网设备之间的通信。
如图3所示，该通信方法包括如下步骤：
S301，源接入网设备向第一网元发送第一切换请求。相应地，第一网元接收来自源接入网设备的第一切换请求。
其中，第一切换请求包括至少一个第一候选接入网设备的标识和终端设备的业务类型信息。
在上述S301，源接入网设备向第一网元发送第一切换请求之前，终端设备可以向源接入网设备发送测量报告。相应地，源接入网设备可以接收来自终端设备的测量报告。
其中，测量报告中可以包括至少一个接入网设备的测量结果，如信号强度、信道状态等。
可选地，源接入网设备可以根据信号强度从至少一个接入网设备中选择至少一个第一候选接入网设备，作为该终端设备的候选目标接入网设备。也就是说，源接入网设备可以选择信号强度满足终端设备需求的接入网设备作为候选目标接入网设备。
示例性地，终端设备的业务类型可以包括如下一项或多项：能力降低(reduced capability，REDCAP)、多播广播服务(multicast broadcast service，MBS)、车联万物(vehicle-to-everything，V2X)、非公共网络(non-public network，NPN)。需要说明的是，终端设备还可以包括其它类型的业务，本申请对此不进行限定。
S302，第一网元确定第一能力信息。
可选地，第一能力信息用于指示至少一个第一候选接入网设备的服务能力。
示例性地，第一能力信息可以包括：至少一个第一候选接入网设备的标识、是否支持终端设备的业务类型。
若第一候选接入网设备支持终端设备的业务类型，第一能力信息还可以包括：接入网设备的具体能力。
例如，第一能力信息可以包括：接入网设备1，支持REDCAP，支持的REDCAP终端设备的最大接入带宽值。
又例如，第一能力信息可以包括：接入网设备1，支持MBS，具体支持哪些MBS业务。
再例如，第一能力信息可以包括：接入网设备1，支持V2X，PC5口的调度模式是模式2(mode 2)还是模式3(mode 3)。
再例如，第一能力信息可以包括：接入网设备1，支持NPN，支持接入的封闭访问组标识(closed access group ID，CAG ID)。
再例如，第一能力信息可以包括：接入网设备2，不支持REDCAP，不支持MBS，不支持V2X，不支持NPN。
需要说明的是，第一能力信息还可以包括至少一个第一候选接入网设备其它类型的能力信息，如当前负载情况、拥塞控制策略、安全控制策略、签约情况(如接入网设备的使用权)、其它管理和控制策略等。
上述S302，第一网元确定第一能力信息，可以包括：第一网元根据已知的信息确定第一能力信息，和/或，第一网元从第二网元获得第一能力信息。其中，第二网元可以为AMF网元、UDM网元、或OAM网元等。本申请实施例对于第一能力信息的来源，不做具体限定。
具体地，第一网元使用上述方式确定第一能力信息的具体原则如下。
可选地，若第一网元根据已知的信息能确定全部第一候选接入网设备的第一能力信息，第一网元可以只根据已知的信息确定第一能力信息。
可选地，若第一网元根据已知的信息只能确定部分第一候选接入网设备的第一能 力信息，或者第一候选接入网设备的部分第一能力信息，第一网元可以根据已知的信息确定一部分第一能力信息，且从第二网元获得另一部分第一能力信息。
或者，可选地，第一网元也可以省去根据已知的信息确定第一能力信息的步骤，直接从第二网元获得全部第一能力信息。
具体地，上述第一网元从第二网元获得第一能力信息，具体可以包括下述S303至S304。
S303，第一网元向第二网元发送第一能力请求。相应地，第二网元接收来自第一网元的第一能力请求。
其中，该第一能力请求可以包括：至少一个第一候选接入网设备的标识。
示例性地，第一能力请求包括接入网设备1的标识、接入网设备2的标识，从而第一网元可以向第二网元请求第二网元掌握的接入网设备1、接入网设备2的所有服务能力。
或者，第一能力请求可以包括：至少一个第一候选接入网设备的标识和终端设备的业务类型信息。
示例性地，第一能力请求包括接入网设备1的标识、接入网设备2的标识和MBS，第一网元向第二网元请求接入网设备1对终端设备的MBS的服务能力、接入网设备2对终端设备的MBS的服务能力。
S304，第二网元向第一网元发送第一能力响应。相应地，第一网元接收来自第二网元的第一能力响应。其中，该第一能力响应包括第一能力信息。
假设接入网设备1支持MBS，接入网设备2不支持MBS，且第一能力请求包括：接入网设备1的标识、接入网设备2的标识和MBS，第一能力信息可以有以下几种实现方式。
示例性地，第一能力信息可以包括：接入网设备1。或者，第一能力信息可以包括：接入网设备1，支持MBS。也就是说，第二网元可以只返回支持第一能力请求中请求的业务类型的接入网设备的能力信息。
示例性地，第一能力信息可以包括：接入网设备1，支持MBS；接入网设备2，不支持MBS。也就是说，第一网元请求哪些接入网设备、终端设备的哪些业务类型，第二网元便返回哪些能力信息。
可选地，第一能力信息中还可以包括第一网元未请求的能力信息。
示例性地，第一能力信息可以包括：接入网设备1，支持MBS；接入网设备2，不支持MBS；接入网设备3，支持MBS；接入网设备4，不支持MBS。也就是说，第二网元可以返回第一网元未请求的接入网设备的对终端设备的MBS的服务能力。
示例性地，第一能力信息还可以包括：接入网设备1，支持MBS，不支持NPN；接入网设备2，不支持MBS，支持NPN。也就是说，除第一候选接入网设备是否支持MBS的信息之外，第二网元还可以返回第一候选接入网设备的其它服务能力，还可以返回当前负载情况、拥塞控制策略等其它类型的能力信息。
示例性地，第一能力信息还可以包括：接入网设备1，支持MBS，不支持NPN；接入网设备2，不支持MBS，支持NPN；接入网设备3，支持MBS，支持NPN；接入网设备4，不支持MBS，支持NPN。也就是说，除了第一网元请求的第一候选接入网 设备对终端设备的MBS的服务能力，第二网元还可以返回第一候选接入网设备的其它服务能力，和/或，第一网元未请求的接入网设备的服务能力，还可以返回当前负载情况、拥塞控制策略等其它类型的能力信息。
需要说明的是，本申请不对第一能力信息的实现方式进行限定，以能实现第一网元确定至少一个第一候选接入网设备能否为终端设备提供服务为准。
S305，第一网元根据第一能力信息，确定至少一个第一候选接入网设备能否为终端设备提供服务。
在一种可能的设计方案中，第一网元根据第一能力信息，确定至少一个第一候选接入网设备能为终端设备提供服务，第一网元可以执行下述S308，向第二网元发送N2切换消息(N2 handover)，以便完成终端设备从源接入网设备向目标接入网设备的切换。
示例性地，假设终端设备请求的业务类型为MBS，第一能力信息包括：接入网设备1，支持MBS；接入网设备2，支持MBS，则接入网设备1、接入网设备2均能为终端设备提供MBS服务，则第一网元可以执行下述S308。
示例性地，假设终端设备请求的业务类型为MBS，第一能力信息包括：接入网设备1，支持MBS；接入网设备2，不支持MBS，则接入网设备1能为终端设备提供服务。也就是说，只要多个第一候选接入网设备中的任意一个第一候选接入网设备能为终端设备提供服务，第一网元即可以执行下述S308。
示例性地，假设终端设备请求的业务类型为MBS和V2X，MBS的优先级高于V2X的优先级，且第一能力信息包括：接入网设备1，支持MBS，不支持V2X；接入网设备2，不支持MBS，不支持V2X，则可以根据业务类型的优先级判断该接入网设备能否为终端设备提供服务，本申请对此不进行限定。
在另一种可能的设计方案中，若第一网元根据第一能力信息，确定至少一个第一候选接入网设备均不能为终端设备提供服务，则第一网元可以确定第二能力信息，并根据第二能力信息确定至少一个第二候选接入网设备。其中，至少一个第二候选接入网设备均为能够为终端设备提供服务的接入网设备。
可选地，第二能力信息可以用于确定至少一个第二候选接入网设备。
可选地，第二能力信息可以包括根据终端设备的业务类型确定的能为终端设备提供服务的接入网设备的能力信息。
可选地，第二能力信息至少包括一个能为终端设备提供服务的接入网设备的能力信息，以便第一网元确定第二候选接入网设备。关于第二能力信息的具体内容可以参照上述S302中第一能力信息的具体内容，此处不再赘述。
示例性地，假设终端设备请求的业务类型为MBS，第一能力信息包括：接入网设备1，不支持MBS；接入网设备2，不支持MBS，即接入网设备1、接入网设备2均不能为终端设备提供服务，则第一网元可以确定第二能力信息，并根据第二能力信息确定至少一个第二候选接入网设备。
也就是说，若确定至少一个第一候选接入网设备不能为终端设备提供服务，第一网元还可以为源接入网设备确定建议的目标接入网设备列表(suggested target-RAN-list)，即至少一个第二候选接入网设备，源接入网设备可以基于至少一个 第二候选接入网设备选择目标接入网设备，并再次发起切换请求，从而提高切换成功率和可靠性。
需要说明的是，至少一个第一候选接入网设备为源接入网设备确定的候选接入网设备，由第一网元确定其能否作为目标接入网设备，至少一个第二候选接入网设备为第一网元确定的能够为终端设备提供服务的接入网设备，由源接入网设备从中确定目标接入网设备，至少一个第二候选接入网设备不包括至少一个第一候选接入网设备。也就是说，第一网元确定第二候选接入网设备列表时，排除已确定不能为终端设备提供服务的至少一个第一候选接入网设备，缩小第二候选接入网设备的选择范围，从而提高切换效率。
下面对上述第一网元确定第二能力信息进行具体阐述。
可选地，上述第一网元确定第二能力信息，可以包括：第一网元根据已知的信息确定第二能力信息，和/或，第二能力信息还可以来自第二网元。
也就是说，第一网元可以只根据已知的信息能确定第二能力信息，第一网元也可以从第二网元获得第二能力信息，第一网元还可以结合第一网元已知的信息和第二网元反馈的信息确定第二能力信息。本申请实施例对于第二能力信息的来源，不做具体限定。
具体地，第一网元从第二网元获得第二能力信息，具体可以包括如下步骤一至步骤二：
步骤一，第一网元向第二网元发送第二能力请求。相应地，第二网元接收来自第一网元的第二能力请求。
其中，该第二能力请求可以包括：终端设备的业务类型信息，即第一网元可以向第二网元请求能够为该终端设备提供服务的第二候选接入网设备。
示例性地，假设终端设备请求的业务类型为MBS，则第二能力请求包括MBS。
示例性地，假设终端设备请求的业务类型为MBS、NPN，则第二能力请求包括MBS、NPN。
步骤二，第二网元向第一网元发送第二能力响应。相应地，第一网元接收来自第二网元的第二能力响应。其中，该第二能力响应包括第二能力信息。
假设至少一个第一候选接入网设备包括接入网设备1、接入网设备2、接入网设备3、接入网设备4，第二能力请求包括MBS、V2X、NPN，第二能力信息可以有以下几种实现方式。
示例性地，第二能力信息可以包括：接入网设备5，支持MBS，支持V2X，支持NPN；接入网设备6，支持MBS，支持V2X，支持NPN。也就是说，第二网元可以只返回支持第二能力请求中请求的全部业务类型的接入网设备的能力信息，即第二网元只返回同时支持MBS、V2X、NPN的接入网设备5、接入网设备6的能力信息。
示例性地，第二能力信息可以包括：接入网设备5，支持MBS，支持V2X，支持NPN；接入网设备6，支持MBS，支持V2X，支持NPN；接入网设备7，不支持MBS，支持V2X，支持NPN。也就是说，第二能力请求包括的业务类型为多个时，第二网元也可以返回支持第二能力请求包括的部分业务类型的接入网设备的能力信息，即第二网元可以返回同时支持MBS、V2X、NPN的接入网设备5、接入网设备6的能力信息， 还可以返回不支持MBS、支持V2X和NPN的接入网设备7的能力信息。
示例性地，第二能力信息可以包括：接入网设备5，支持MBS，支持V2X，支持NPN，不支持REDCAP；接入网设备6，支持MBS，支持V2X，支持NPN，支持REDCAP；接入网设备7，不支持MBS，支持V2X，支持NPN，支持REDCAP。也就是说，第二网元也可以返回支持第二能力请求包括的部分或全部业务类型信息的接入网设备的其它服务能力，如是否支持REDCAP，还可以返回当前负载情况、拥塞控制策略等其它类型的能力信息。
需要说明的是，本申请不对第二能力信息的实现方式进行限定，以能实现确定至少一个第二候选接入网设备为准。
需要说明的是，第一网元也可以在上述S303至S304第一网元与第二网元交互的过程中获得第二能力信息，本申请对何时获得第二能力信息不进行限定。
下面对上述第一网元根据第二能力信息确定至少一个第二候选接入网设备进行具体阐述。
示例性地，假设终端设备请求的业务类型为MBS，第二能力信息包括：接入网设备5，支持MBS；接入网设备6，支持MBS；接入网设备7，不支持MBS，则至少一个第二候选接入网设备包括接入网设备5、接入网设备6。
当终端设备请求的业务类型为多个时，可以优先选择同时支持终端设备请求的全部业务的接入网设备作为第二候选接入网设备，也可以选择支持的终端设备请求的业务类型的数量最多的接入网设备作为第二候选接入网设备，还可以根据业务类型的优先级选择第二候选接入网设备。
示例性地，假设终端设备请求的业务类型为MBS、V2X、NPN，可以基于如下规则选择第二候选接入网设备：
优先选择同时支持MBS、V2X、NPN的接入网设备；
若不存在同时支持MBS、V2X、NPN的接入网设备，可以选择支持其中部分业务的接入网设备，如选择同时支持MBS和V2X，和/或同时支持MBS和NPN，和/或同时支持V2X和NPN的接入网设备；
若不存在同时支持MBS、V2X、NPN的接入网设备，还可以根据业务类型的优先级选择第二候选接入网设备。
例如，假设MBS的优先级>V2X的优先级>NPN的优先级，可以优先选择支持MBS和V2X的接入网设备作为第二候选接入网设备，还可以选择支持MBS和NPN的接入网设备作为第二候选接入网设备，还可以选择支持MBS的接入网设备作为第二候选接入网设备。
需要说明的是，第一网元可以根据终端设备的实际需求确定至少一个第二候选接入网设备，本申请对此不进行限定。
S306，第一网元向源接入网设备发送切换响应。相应地，源接入网设备接收来自第一网元的切换响应。
其中，切换响应用于指示至少一个第一候选接入网设备不能为终端设备提供服务。
示例性地，假设终端设备请求的业务类型为MBS，第一能力信息包括：接入网设备1，不支持MBS，则切换响应指示接入网设备1不能为该终端设备提供服务。
可选地，切换响应可以包括至少一个第二候选接入网设备的标识，至少一个第二候选接入网设备是根据终端设备的业务类型确定的。确定至少一个第二候选接入网设备的具过程可参照上述S305，此处不再赘述。也就是说，切换响应还可以包括目标接入网设备列表，即至少一个第二候选接入网设备的标识，以供源接入网设备再次选择目标接入网设备时使用，源接入网设备可以基于至少一个第二候选接入网设备选择目标接入网设备，并发起第二切换请求。
S307，源接入网设备还可以向第一网元发送第二切换请求。相应地，第一网元还可以接收来自源接入网设备的第二切换请求。
其中，第二切换请求包括目标接入网设备的标识，该目标接入网设备的标识可以是从至少一个第二候选接入网设备中确定的。
可选地，源接入网设备可以根据信号强度从至少一个第二候选接入网设备中确定目标接入网设备。也就是说，源接入网设备在重新确定目标接入网设备时，可以从第一网元建议的能为终端设备提供服务的接入网设备中选择信号强度最强的接入网设备作为目标接入网设备，排除了不能为终端设备提供服务的接入网设备，可以提高目标接入网设备的选择效率。
可选地，源接入网设备还可以根据接入网设备的其它类型的能力信息从至少一个第二候选接入网设备中选择目标接入网设备，如，可以根据各个接入网设备的当前负载情况，选择当前负载最轻的接入网设备作为目标接入网设备，可以根据接入网设备的接入带宽选择传输速率最快的接入网设备作为目标接入网设备，还可以综合考虑接入网设备的当前负载情况、拥塞控制策略、安全控制策略、签约情况、其它管理和控制策略等信息确定目标接入网设备，具体实现方式可根据实际需求进行设定，本申请对此不进行限定。
S308，第一网元向第二网元发送N2切换消息(N2 handover)。
需要说明的是，第一网元接收来自源接入网设备的第二切换请求后，还可以确定第二切换请求包括的目标接入网设备能否为终端设备提供服务，也可以不再进行判断，本申请对此不进行限定。
具体地，第一网元确定选择的目标接入网设备能够为终端设备提供服务后，第一网元向第二网元发送N2切换消息，具体实现方式可参照现有技术，本申请不再赘述。
基于图3所示的通信方法，源接入网设备向第一网元发送第一切换请求，该第一切换请求包括至少一个第一候选接入网设备的标识和终端设备的业务类型信息，然后第一网元确定用于指示至少一个第一候选接入网设备的服务能力的第一能力信息，并由第一网元根据该第一能力信息确定至少一个第一候选接入网设备能否为终端设备提供服务，若不能为终端设备提供服务，第一网元向源接入网设备发送指示不能为终端设备提供服务的切换响应。如此，由第一网元判断第一候选接入网设备能否作为目标接入网设备，可以减少第一网元与第一候选接入网设备之间的复杂的信令交互，节省大量的信令资源，并且第一网元在判断过程中考虑了第一候选接入网设备的能力信息，可以提高切换成功率和可靠性，从而提高切换效率。
需要说明的是，在上述图3所示出的通信方法中，接入网设备的能力判断是由第一网元执行的。本申请实施例中，该判断也可以由源接入网设备来执行，具体参见下 述图4-图6中所示出的通信方法。
图4为本申请实施例提供的通信方法的流程示意图二。该通信方法可以适用于图1所示的通信系统中，执行源接入网设备的功能。如图4所示，该通信方法包括如下步骤：
S401，源接入网设备确定第一能力信息。
其中，第一能力信息用于指示至少一个第一候选接入网设备的服务能力。关于第一能力信息的具体内容可参照上述S302，此处不再赘述。
具体地，上述S401，源接入网设备确定第一能力信息，可以包括：下述S501-S505源接入网设备从第一网元获得第一能力信息、或下述S601-S603源接入网设备从终端设备获得第一能力信息。
可选地，在上述S401，源接入网设备确定第一能力信息之前，终端设备可以向源接入网设备发送测量报告。相应地，源接入网设备可以接收来自终端设备的测量报告。
其中，测量报告中可以包括至少一个接入网设备的测量结果，如信号强度、信道状态等。
S402，源接入网设备根据至少一个第一候选接入网设备的信号强度和第一能力信息选择目标接入网设备。
具体地，源接入网设备可以根据至少一个第一候选接入网设备的信号强度和第一能力信息选择能为终端设备提供服务的接入网设备。
也就是说，源接入网设备可以根据信号强度从至少一个第一候选接入网设备中选择信号强度满足终端设备需求的接入网设备，并根据第一能力信息从信号强度满足终端设备需求的接入网设备中确定出能为终端设备的业务类型提供服务的接入网设备作为目标接入网设备。
需要说明的是，源接入网设备还可以根据接入网设备的其它类型的能力信息，从能为终端设备的业务类型提供服务的接入网设备中选择目标接入网设备，如，可以根据各个接入网设备的当前负载情况，选择当前负载最轻的接入网设备作为目标接入网设备，可以根据接入网设备的接入带宽选择传输速率最快的接入网设备作为目标接入网设备，还可以综合考虑接入网设备的当前负载情况、拥塞控制策略、安全控制策略、签约情况、其它管理和控制策略、信号强度等信息确定目标接入网设备，具体实现方式可根据实际需求进行设定，本申请对此不进行限定。
当终端设备请求的业务类型为多个时，可以优先选择同时支持终端设备请求的全部业务的接入网设备作为目标接入网设备，也可以选择支持的终端设备请求的业务类型的数量最多的接入网设备作为目标接入网设备，还可以根据业务类型的优先级选择目标接入网设备。具体示例可参照上述S305中选择第二候选接入网设备的示例，此处不再赘述。
可选地，源接入网设备向第一网元发送切换请求。相应地，第一网元接收源接入网设备发送的切换请求。其中，切换请求包括目标接入网设备的标识。
也就是说，源接入网设备为终端设备确定目标接入网设备后，可以向第一网元发送切换请求。第一网元可以直接执行上述S308，第一网元向第二网元发送N2切换消息。第一网元也可以先判断选择的目标接入网设备是否合理，若合理，执行上述S308。 若不合理，第一网元可以执行上述S306，第一网元向源接入网设备发送切换响应，指示源接入网设备重新选择目标接入网设备。
基于图4所示的通信方法，源接入网设备在确定目标接入网设备时考虑了第一候选接入网设备的服务能力，可以解决仅根据信号强度选择的目标接入网设备不支持该终端设备的业务的问题，可以提高切换成功率和可靠性，节省大量的信令资源，从而提高切换效率。
在一种可能的设计方法中，上述S401，源接入网设备确定第一能力信息，可以包括：源接入网设备从第一网元获取第一能力信息，具体参见下述图5所示出的通信方法。
在另一种可能的设计方法中，上述S401，源接入网设备确定第一能力信息，可以包括：源接入网设备从终端设备获取第一能力信息，具体参见下述图6所示出的通信方法。
图5为本申请实施例提供的通信方法的流程示意图三。该通信方法可以适用于图1所示的源接入网设备与第一网元之间的通信。如图5所示，该通信方法包括如下步骤：
S501，源接入网设备向第一网元发送能力信息请求。相应地，第一网元接收来自源接入网设备的能力信息请求。
其中，能力信息请求包括至少一个第一候选接入网设备的标识和/或业务类型信息，能力信息请求用于请求第一能力信息，业务类型信息用于指示第一能力信息的范围。
可选地，业务类型信息包括终端设备的业务类型，终端设备的业务类型包括的具体内容可参照上述S302，此处不再赘述。
示例性地，能力信息请求可以包括接入网设备1的标识、接入网设备2的标识，源接入网设备可以向第一网元请求接入网设备1、接入网设备2的所有服务能力。
示例性地，能力信息请求可以包括MBS，源接入网设备可以向第一网元请求一个或多个接入网设备对终端设备的MBS的服务能力。
示例性地，能力信息请求可以包括接入网设备1的标识、接入网设备2的标识和MBS，源接入网设备可以向第一网元请求接入网设备1对终端设备的MBS的服务能力、接入网设备2对终端设备的MBS的服务能力。
S502，第一网元确定第一能力信息。
具体地，上述S502，第一网元确定第一能力信息，可以包括：第一网元根据已知的信息确定第一能力信息，和/或，第一网元从第二网元获得第一能力信息。
具体地，第一网元使用上述方式确定第一能力信息的具体原则可参照上述S302中对该具体原则的具体阐述，此处不再赘述。
可选地，上述第一网元从第二网元获得第一能力信息，具体可以包括下述S503至S504。
S503，第一网元向第二网元发送第三能力请求。相应地，第二网元接收来自第一网元的第三能力请求。
可选地，第三能力请求可以包括至少一个第一候选接入网设备的标识。具体示例可参照上述S303中第一能力请求的示例，此处不再赘述。
可选地，第三能力请求可以包括至少一个第一候选接入网设备的标识和业务类型信息。具体示例可参照上述S303中第一能力请求的示例，此处不再赘述。
可选地，第三能力请求可以包括业务类型信息。也就是说，第一网元可以向第二网元请求一个或多个接入网设备对终端设备的MBS的服务能力，包括支持MBS的接入网设备，和不支持MBS的接入网设备。
S504，第二网元向第一网元发送第三能力响应。相应地，第一网元接收来自第二网元的第三能力响应。其中，该第三能力响应包括第一能力信息。
示例性地，假设接入网设备1支持MBS，接入网设备2不支持MBS，且第三能力请求包括：接入网设备1的标识、接入网设备2的标识和MBS，第一能力信息的实现方式可参照上述S304中第一能力信息的具体实现方式，此处不再赘述。
示例性地，假设接入网设备1支持MBS，接入网设备2不支持MBS，且第三能力请求包括：MBS，则第一能力信息可以包括：接入网设备1，支持MBS；接入网设备2，不支持MBS。
需要说明的是，本申请不对第一能力信息的实现方式进行限定，以能表达至少一个第一候选接入网设备的服务能力为准。
在一种可能的设计方案中，第一网元可以确定第二能力信息，第二能力信息至少包括一个能为终端设备提供服务的接入网设备的能力信息。关于第二能力信息的具体内容可以参照上述S302中第一能力信息的具体内容，此处不再赘述。
可选地，第二能力信息用于确定至少一个第二候选接入网设备，至少一个第二候选接入网设备均为能够为终端设备提供服务的接入网设备，从而源接入网设备可以从至少一个第二候选接入网设备中选择目标接入网设备，避免从不能为终端设备提供服务的接入网设备中选择目标接入网设备，从而提高切换成功率和可靠性。
关于第一网元确定第二能力信息的具体实现方式可参照上述S305中第一网元确定第二能力信息的具体阐述，此处不再赘述。
需要说明的是，本申请不对第二能力信息的实现方式进行限定，以能实现确定至少一个第二候选接入网设备为准。
S505，第一网元向源接入网设备发送第一能力信息。相应地，源接入网设备接收来自第一网元的第一能力信息。
可选地，第一网元还可以向源接入网设备发送第二能力信息。相应地，源接入网设备接收来自第一网元的第二能力信息。也就是说，第一网元可以只将支持业务类型信息的接入网设备的能力信息发送给源接入网设备，排除不能为终端设备提供服务的接入网设备，缩小目标接入网设备的选择范围，从而提高切换效率。
S506，源接入网设备根据至少一个第一候选接入网设备的信号强度和第一能力信息选择目标接入网设备。
具体地，S506，源接入网设备根据至少一个第一候选接入网设备的信号强度和第一能力信息选择目标接入网设备的具体实现方式可参照上述S402，此处不再赘述。
可选地，源接入网设备可以根据至少一个第一候选接入网设备的信号强度和第二能力信息确定目标接入网设备，具体实现方式与源接入网设备根据至少一个第一候选接入网设备的信号强度和第一能力信息选择目标接入网设备的具体实现方式类似，此 处不再赘述。
基于图5所示的通信方法，源接入网设备从第一网元获得包括至少一个第一候选接入网设备的服务能力的第一能力信息，并根据至少一个第一候选接入网设备的信号强度和第一能力信息选择目标接入网设备，可以解决仅根据信号强度选择的目标接入网设备不支持该终端设备的业务的问题，可以提高目标接入网设备选择准确性，从而提高切换效率。
图6为本申请实施例提供的通信方法的流程示意图四。该通信方法可以适用于图1所示的源接入网设备与终端设备之间的通信。如图6所示，该通信方法包括如下步骤：
S601，源接入网设备向终端设备发送能力信息请求。相应地，终端设备接收来自源接入网设备的能力信息请求。
其中，能力信息请求包括至少一个第一候选接入网设备的标识和/或业务类型信息，能力信息请求用于请求第一能力信息，业务类型信息用于指示第一能力信息的范围。关于能力信息请求的实现方式可参照上述S501，此处不再赘述。
可选地，能力信息请求用于指示终端设备监听至少一个第一候选接入网设备的系统消息并确定第一能力信息。
可选地，业务类型信息包括终端设备的业务类型，终端设备的业务类型包括的具体内容可参照上述S302，此处不再赘述。
S602，终端设备监听至少一个第一候选接入网设备的系统消息并确定第一能力信息。
可选地，终端设备根据能力信息请求确定第一能力信息，也就是说，终端设备根据源接入网设备的指示监听至少一个第一候选接入网设备的系统消息，从监听到的系统消息中确定源接入网设备请求的第一能力信息。
可选地，终端设备还可以监听源接入网设备指示其监听的至少一个第一候选接入网设备以外的其他接入网设备的系统消息，从监听到的系统消息中确定其他接入网设备的能力信息。
S603，终端设备向源接入网设备发送第一能力信息。相应地，源接入网设备接收来自终端设备的第一能力信息。
可选地，第一能力信息中还可以包括源接入网设备未请求的能力信息。具体实现方式可参照上述S304。
需要说明的是，终端设备可以从监听的系统消息中，筛选出支持终端设备的业务类型信息的接入网设备的能力信息，并返回给源接入网设备。
S604，源接入网设备根据至少一个第一候选接入网设备的信号强度和第一能力信息选择目标接入网设备。
具体地，S604，源接入网设备根据至少一个第一候选接入网设备的信号强度和第一能力信息选择目标接入网设备的具体实现方式可参照上述S402，此处不再赘述。
基于图6所示的通信方法，源接入网设备从终端设备获得包括至少一个第一候选接入网设备的服务能力的第一能力信息，并根据至少一个第一候选接入网设备的信号强度和第一能力信息选择目标接入网设备，可以解决仅根据信号强度选择的目标接入 网设备不支持该终端设备的业务的问题，可以提高目标接入网设备选择准确性，从而提高切换效率。
以上结合图3-图6详细说明了本申请实施例提供的通信方法。以下结合图7-图11详细说明本申请实施例提供的通信装置。
图7是本申请实施例提供的通信装置的结构示意图二。该通信装置可适用于图1所示出的通信系统中，执行图3所示的通信方法中第一网元的功能。为了便于说明，图7仅示出了该通信装置的主要部件。
如图7所示，通信装置700包括：收发模块701和处理模块702。
其中，收发模块701，用于接收来自源接入网设备的第一切换请求。其中，第一切换请求包括至少一个第一候选接入网设备的标识和终端设备的业务类型信息。处理模块702，用于确定第一能力信息。其中，第一能力信息用于指示至少一个第一候选接入网设备的服务能力。处理模块702，还用于根据第一能力信息，确定至少一个第一候选接入网设备能否为终端设备提供服务。
可选地，终端设备的业务类型可以包括如下一项或多项：能力降低、多播广播服务、车联万物、非公共网络。
可选地，第一能力信息来自第二网元。
在一种可能的设计方案中，收发模块701，还用于接收来自第二网元的第二能力信息。其中，第二能力信息用于确定至少一个第二候选接入网设备。
在一种可能的设计方案中，收发模块701，还用于向源接入网设备发送切换响应。其中，切换响应可以包括至少一个第二候选接入网设备的标识，至少一个第二候选接入网设备是根据终端设备的业务类型确定的。
需要说明的是，收发模块701可以包括接收模块和发送模块(图7中未示出)。其中，接收模块用于接收来自源接入网设备和/或第二网元的数据和/或信令；发送模块用于向源接入网设备和/或第二网元发送数据和/或信令。本申请对于收发模块701的具体实现方式，不做具体限定。
可选地，通信装置700还可以包括存储模块(图7中未示出)，该存储模块存储有程序或指令。当处理模块702执行该程序或指令时，使得通信装置700可以执行图3所示的通信方法中第一网元的功能。
需要说明的是，通信装置700可以是图1所示的第一网元或图2所示的通信装置200，如接入和移动性管理功能(core access and mobility management function，AMF)网元，也可以是可设置于接入网设备的芯片(系统)或其他部件或组件，本申请对此不做限定。
此外，图7所示的通信装置700的技术效果可以参考图3所示的通信方法的技术效果，此处不再赘述。
图8是本申请实施例提供的通信装置的结构示意图三。该通信装置可适用于图1所示出的通信系统中，执行图3所示的通信方法中源接入网设备的功能。为了便于说明，图8仅示出了该通信装置的主要部件。
如图8所示，通信装置800包括：接收模块801和发送模块802。
其中，发送模块802，用于向第一网元发送第一切换请求。其中，第一切换请求 包括至少一个第一候选接入网设备的标识和终端设备的业务类型信息。接收模块801，还用于接收来自第一网元的切换响应，切换响应用于指示至少一个第一候选接入网设备不能为终端设备提供服务。
可选地，终端设备的业务类型可以包括如下一项或多项：能力降低、多播广播服务、车联万物、非公共网络。
可选地，切换响应可以包括至少一个第二候选接入网设备的标识，至少一个第二候选接入网设备是根据终端设备的业务类型确定的。
在一种可能的设计方案中，通信装置800还可以包括：处理模块803。其中，处理模块803，用于根据至少一个第二候选接入网设备的标识确定目标接入网设备。
在一种可能的设计方案中，发送模块802，还用于向第一网元发送第二切换请求。其中，第二切换请求包括目标接入网设备的标识。
需要说明的是，接收模块801和发送模块802可以分开设置，也可以集成在一个模块中，即收发模块(图8中未示出)。本申请对于接收模块801和发送模块802的具体实现方式，不做具体限定。
可选地，通信装置800还可以包括存储模块(图8中未示出)，该存储模块存储有程序或指令。当处理模块803执行该程序或指令时，使得通信装置800可以执行图3所示的通信方法中源接入网设备的功能。
需要说明的是，通信装置800可以是图1所示的源接入网设备或图2所示的通信装置200，也可以是可设置于源接入网设备的芯片(系统)或其他部件或组件，本申请对此不做限定。
此外，图8所示的通信装置800的技术效果可以参考图3所示的通信方法的技术效果，此处不再赘述。
图9是本申请实施例提供的通信装置的结构示意图四。该通信装置可适用于图1所示出的通信系统中，执行图4所示的通信方法中源接入网设备的功能。为了便于说明，图9仅示出了该通信装置的主要部件。
如图9所示，通信装置900包括：确定模块901和选择模块902。
其中，确定模块901，用于确定第一能力信息。其中，第一能力信息用于指示至少一个第一候选接入网设备的服务能力。选择模块902，还用于根据至少一个第一候选接入网设备的信号强度和第一能力信息选择目标接入网设备。
在一种可能的设计方案中，通信装置900还可以包括：收发模块903。其中，收发模块903，用于向第一网元或终端设备发送能力信息请求。其中，能力信息请求包括至少一个第一候选接入网设备的标识和/或业务类型信息，能力信息请求用于请求第一能力信息，业务类型信息用于指示第一能力信息的范围。
可选地，能力信息请求用于指示终端设备监听至少一个第一候选接入网设备的系统消息并确定第一能力信息。
可选地，业务类型信息可以包括终端设备的业务类型，终端设备的业务类型可以包括如下一项或多项：能力降低、多播广播服务、车联万物、非公共网络。
可选地，收发模块903可以包括接收模块和发送模块(图9中未示出)。其中，接收模块用于接收来自第一网元和/或终端设备的数据和/或信令；发送模块用于向 第一网元和/或终端设备发送数据和/或信令。本申请对于收发模块903的具体实现方式，不做具体限定。
需要说明的是，确定模块901和选择模块902执行的都是处理功能，可以分开设置，也可以集成在一个模块中，即处理模块(图9中未示出)。本申请对于确定模块901和选择模块902的具体实现方式，不做具体限定。
可选地，通信装置900还可以包括存储模块(图9中未示出)，该存储模块存储有程序或指令。当处理模块执行该程序或指令时，使得通信装置900可以执行图4、图5和图6所示的通信方法中源接入网设备的功能。
需要说明的是，通信装置900可以是图1所示的源接入网设备或图2所示的通信装置200，也可以是可设置于源接入网设备的芯片(系统)或其他部件或组件，本申请对此不做限定。
此外，图9所示的通信装置900的技术效果可以参考图4、图5和图6所示的通信方法的技术效果，此处不再赘述。
图10是本申请实施例提供的通信装置的结构示意图五。该通信装置可适用于图1所示出的通信系统中，执行图5所示的通信方法中第一网元的功能。为了便于说明，图10仅示出了该通信装置的主要部件。
如图10所示，通信装置1000包括：接收模块1001和发送模块1002。
其中，接收模块1001，用于接收来自源接入网设备的能力信息请求。其中，能力信息请求包括至少一个第一候选接入网设备的标识和/或业务类型信息，能力信息请求用于请求第一能力信息，业务类型信息用于指示第一能力信息的范围。发送模块1002，用于向源接入网设备发送第一能力信息。
可选地，第一能力信息来自第二网元。
在一种可能的设计方案中，接收模块1001，还用于接收来自第二网元的第二能力信息。其中，第二能力信息用于确定至少一个第二候选接入网设备。
可选地，业务类型信息可以包括终端设备的业务类型，终端设备的业务类型可以包括如下一项或多项：能力降低、多播广播服务、车联万物、非公共网络。
需要说明的是，接收模块1001和发送模块1002可以分开设置，也可以集成在一个模块中，即收发模块(图10中未示出)。本申请对于接收模块1001和发送模块1002的具体实现方式，不做具体限定。
可选地，通信装置1000还可以包括处理模块1003和存储模块(图10中未示出)，该存储模块存储有程序或指令。当处理模块1003执行该程序或指令时，使得通信装置1000可以执行图5所示的通信方法中第一网元的功能。
需要说明的是，通信装置1000可以是图1所示的第一网元或图2所示的通信装置200，也可以是可设置于第一网元的芯片(系统)或其他部件或组件，本申请对此不做限定。
此外，图10所示的通信装置1000的技术效果可以参考图5所示的通信方法的技术效果，此处不再赘述。
图11是本申请实施例提供的通信装置的结构示意图六。该通信装置可适用于图1所示出的通信系统中，执行图6所示的通信方法中终端设备的功能。为了便于说明， 图11仅示出了该通信装置的主要部件。
如图11所示，通信装置1100包括：接收模块1101和发送模块1102。
其中，接收模块1101，用于接收来自源接入网设备的能力信息请求。其中，能力信息请求包括至少一个第一候选接入网设备的标识和/或业务类型信息，能力信息请求用于请求第一能力信息，业务类型信息用于指示第一能力信息的范围。发送模块1102，还用于向源接入网设备发送第一能力信息。
在一种可能的设计方案中，通信装置1100还可以包括：处理模块1103。其中，处理模块1103，用于监听至少一个第一候选接入网设备的系统消息并确定第一能力信息。
可选地，业务类型信息可以包括通信装置1100的业务类型，通信装置1100的业务类型可以包括如下一项或多项：能力降低、多播广播服务、车联万物、非公共网络。
需要说明的是，接收模块1101和发送模块1102可以分开设置，也可以集成在一个模块中，即收发模块(图11中未示出)。本申请对于接收模块1101和发送模块1102的具体实现方式，不做具体限定。
可选地，通信装置1100还可以包括存储模块(图11中未示出，该存储模块存储有程序或指令。当处理模块1103执行该程序或指令时，使得通信装置1100可以执行图6所示的通信方法中终端设备的功能。
需要说明的是，通信装置1100可以是图1所示的终端设备或图2所示的通信装置200，也可以是可设置于终端设备的芯片(系统)或其他部件或组件，本申请对此不做限定。
此外，图11所示的通信装置1100的技术效果可以参考图6所示的通信方法的技术效果，此处不再赘述。
本申请实施例提供一种通信系统。该系统包括第一网元、源接入网设备、目标接入网设备、终端设备。其中，第一网元可以是AMF网元。可选地，该系统还可以包括第二网元，如AMF网元，UDM网元，OAM网元。
本申请实施例提供一种计算机可读存储介质，包括：该计算机可读存储介质包括计算机程序或指令；当该计算机程序或指令在计算机上运行时，使得该计算机执行上述方法实施例所述的通信方法。
本申请实施例提供一种计算机程序产品，包括计算机程序或指令，当该计算机程序或指令在计算机上运行时，使得该计算机执行上述方法实施例所述的通信方法。
应理解，在本申请实施例中的处理器可以是中央处理单元(central processing unit，CPU)，该处理器还可以是其他通用处理器、数字信号处理器(digital signal processor，DSP)、专用集成电路(application specific integrated circuit，ASIC)、现成可编程门阵列(field programmable gate array，FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。
还应理解，本申请实施例中的存储器可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(read-only memory，ROM)、可编程只读存储器(programmable ROM，PROM)、 可擦除可编程只读存储器(erasable PROM，EPROM)、电可擦除可编程只读存储器(electrically EPROM，EEPROM)或闪存。易失性存储器可以是随机存取存储器(random access memory，RAM)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的随机存取存储器(random access memory，RAM)可用，例如静态随机存取存储器(static RAM，SRAM)、动态随机存取存储器(DRAM)、同步动态随机存取存储器(synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(double data rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(synchlink DRAM，SLDRAM)和直接内存总线随机存取存储器(direct rambus RAM，DR RAM)。
上述实施例，可以全部或部分地通过软件、硬件(如电路)、固件或其他任意组合来实现。当使用软件实现时，上述实施例可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令或计算机程序。在计算机上加载或执行所述计算机指令或计算机程序时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以为通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集合的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质(例如，软盘、硬盘、磁带)、光介质(例如，DVD)、或者半导体介质。半导体介质可以是固态硬盘。
应理解，本文中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况，其中A,B可以是单数或者复数。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系，但也可能表示的是一种“和/或”的关系，具体可参考前后文进行理解。
本申请中，“至少一个”是指一个或者多个，“多个”是指两个或两个以上。“以下至少一项(个)”或其类似表达，是指的这些项中的任意组合，包括单项(个)或复数项(个)的任意组合。例如，a,b,或c中的至少一项(个)，可以表示：a,b,c,a-b,a-c,b-c,或a-b-c，其中a,b,c可以是单个，也可以是多个。
应理解，在本申请的各种实施例中，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元或模块及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、 装置和单元或模块的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，上述单元或模块的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或模块可以结合或者可以集成到另一个系统，或一些单元或模块可以忽略，或其对应的功能不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元/模块的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元/模块可以是或者也可以不是物理上分开的，作为单元/模块显示的部件可以是或者也可以不是物理单元/模块，即可以位于一个地方，或者也可以分布到多个网络单元/模块上。可以根据实际的需要选择其中的部分或者全部单元/模块来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元/模块可以集成在一个处理单元/模块中，也可以是各个单元/模块单独物理存在，也可以两个或两个以上单元/模块集成在一个单元/模块中。
所述功能如果以软件功能单元/模块的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(read-only memory，ROM)、随机存取存储器(random access memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (35)

  1. 一种通信方法，其特征在于，包括：
    接收来自源接入网设备的第一切换请求；其中，所述第一切换请求包括至少一个第一候选接入网设备的标识和终端设备的业务类型信息；
    确定第一能力信息；其中，所述第一能力信息用于指示所述至少一个第一候选接入网设备的服务能力；
    根据所述第一能力信息，确定所述至少一个第一候选接入网设备能否为所述终端设备提供服务。
  2. 根据权利要求1所述的通信方法，其特征在于，所述终端设备的业务类型包括如下一项或多项：能力降低、多播广播服务、车联万物、非公共网络。
  3. 根据权利要求1或2所述的通信方法，其特征在于，所述第一能力信息来自第二网元。
  4. 根据权利要求1-3中任一项所述的通信方法，其特征在于，所述方法还包括：
    接收来自所述第二网元的第二能力信息；其中，所述第二能力信息用于确定至少一个第二候选接入网设备。
  5. 根据权利要求1-4中任一项所述的通信方法，其特征在于，所述方法还包括：
    向所述源接入网设备发送切换响应；其中，所述切换响应包括所述至少一个第二候选接入网设备的标识，所述至少一个第二候选接入网设备是根据所述终端设备的业务类型确定的。
  6. 一种通信方法，其特征在于，包括：
    向第一网元发送第一切换请求；其中，所述第一切换请求包括至少一个第一候选接入网设备的标识和终端设备的业务类型信息；
    接收来自所述第一网元的切换响应；其中，所述切换响应用于指示所述至少一个第一候选接入网设备不能为所述终端设备提供服务。
  7. 根据权利要求6所述的通信方法，其特征在于，所述终端设备的业务类型包括如下一项或多项：能力降低、多播广播服务、车联万物、非公共网络。
  8. 根据权利要求6或7所述的通信方法，其特征在于，所述方法还包括：
    所述切换响应包括至少一个第二候选接入网设备的标识，所述至少一个第二候选接入网设备是根据所述终端设备的业务类型确定的。
  9. 根据权利要求8所述的通信方法，其特征在于，所述方法还包括：
    根据所述至少一个第二候选接入网设备的标识确定目标接入网设备。
  10. 根据权利要求9所述的通信方法，其特征在于，所述方法还包括：
    向所述第一网元发送第二切换请求；其中，所述第二切换请求包括所述目标接入网设备的标识。
  11. 一种通信方法，其特征在于，包括：
    确定第一能力信息；其中，所述第一能力信息用于指示至少一个第一候选接入网设备的服务能力；
    根据所述至少一个第一候选接入网设备的信号强度和所述第一能力信息确定目标接入网设备。
  12. 根据权利要求11所述的通信方法，其特征在于，所述确定第一能力信息，包括：
    向第一网元或终端设备发送能力信息请求；其中，所述能力信息请求包括所述至少一个第一候选接入网设备的标识和/或业务类型信息，所述能力信息请求用于请求所述第一能力信息，所述业务类型信息用于指示所述第一能力信息的范围。
  13. 根据权利要求12所述的通信方法，其特征在于，所述能力信息请求用于指示所述终端设备监听所述至少一个第一候选接入网设备的系统消息并确定所述第一能力信息。
  14. 根据权利要求12或13所述的通信方法，其特征在于，所述业务类型信息包括终端设备的业务类型，所述终端设备的业务类型包括如下一项或多项：能力降低、多播广播服务、车联万物、非公共网络。
  15. 一种通信方法，其特征在于，包括：
    接收来自源接入网设备的能力信息请求；其中，所述能力信息请求包括至少一个第一候选接入网设备的标识和/或业务类型信息，所述能力信息请求用于请求第一能力信息，所述业务类型信息用于指示所述第一能力信息的范围；
    向所述源接入网设备发送所述第一能力信息。
  16. 根据权利要求15所述的通信方法，其特征在于，所述第一能力信息来自第二网元。
  17. 根据权利要求15或16所述的通信方法，其特征在于，所述方法还包括：
    接收来自所述第二网元的第二能力信息；其中，所述第二能力信息用于确定至少一个第二候选接入网设备。
  18. 根据权利要求15-17中任一项所述的通信方法，其特征在于，所述业务类型信息包括终端设备的业务类型，所述终端设备的业务类型包括如下一项或多项：能力降低、多播广播服务、车联万物、非公共网络。
  19. 一种通信装置，其特征在于，包括：收发模块和处理模块；其中，
    所述收发模块，用于接收来自源接入网设备的第一切换请求；其中，所述第一切换请求包括至少一个第一候选接入网设备的标识和终端设备的业务类型信息；
    所述处理模块，用于确定第一能力信息；其中，所述第一能力信息用于指示所述至少一个第一候选接入网设备的服务能力；
    所述处理模块，还用于根据所述第一能力信息，确定所述至少一个第一候选接入网设备能否为所述终端设备提供服务。
  20. 根据权利要求19所述的通信装置，其特征在于，所述终端设备的业务类型包括如下一项或多项：能力降低、多播广播服务、车联万物、非公共网络。
  21. 根据权利要求19或20所述的通信装置，其特征在于，所述第一能力信息来自第二网元。
  22. 根据权利要求19-21中任一项所述的通信装置，其特征在于，
    所述收发模块，还用于接收来自第二网元的第二能力信息；其中，所述第二能力信息用于确定至少一个第二候选接入网设备。
  23. 根据权利要求19-22中任一项所述的通信装置，其特征在于，
    所述收发模块，还用于向所述源接入网设备发送切换响应；其中，所述切换响应包括所述至少一个第二候选接入网设备的标识，所述至少一个第二候选接入网设备是根据所述终端设备的业务类型确定的。
  24. 一种通信装置，其特征在于，包括：接收模块和发送模块；其中，
    所述发送模块，用于向第一网元发送第一切换请求；其中，所述第一切换请求包括至少一个第一候选接入网设备的标识和终端设备的业务类型信息；
    所述接收模块，还用于接收来自所述第一网元的切换响应；其中，所述切换响应用于指示所述至少一个第一候选接入网设备不能为所述终端设备提供服务。
  25. 根据权利要求24所述的通信装置，其特征在于，所述终端设备的业务类型包括如下一项或多项：能力降低、多播广播服务、车联万物、非公共网络。
  26. 根据权利要求24或25所述的通信装置，其特征在于，
    所述切换响应包括至少一个第二候选接入网设备的标识，所述至少一个第二候选接入网设备是根据所述终端设备的业务类型确定的。
  27. 根据权利要求26所述的通信装置，其特征在于，还包括：处理模块；其中，
    所述处理模块，用于根据所述至少一个第二候选接入网设备的标识确定目标接入网设备。
  28. 根据权利要求27所述的通信装置，其特征在于，
    所述发送模块，还用于向所述第一网元发送第二切换请求；其中，所述第二切换请求包括所述目标接入网设备的标识。
  29. 一种通信装置，其特征在于，包括：确定模块和选择模块；其中，
    所述确定模块，用于确定第一能力信息；其中，所述第一能力信息用于指示至少一个第一候选接入网设备的服务能力；
    所述选择模块，用于根据所述至少一个第一候选接入网设备的信号强度和所述第一能力信息选择目标接入网设备。
  30. 根据权利要求29所述的通信装置，其特征在于，还包括：收发模块；其中，
    所述收发模块，用于向第一网元或终端设备发送能力信息请求；其中，所述能力信息请求包括所述至少一个第一候选接入网设备的标识和/或业务类型信息，所述能力信息请求用于请求所述第一能力信息，所述业务类型信息用于指示所述第一能力信息的范围。
  31. 根据权利要求30所述的通信装置，其特征在于，所述能力信息请求用于指示所述终端设备监听所述至少一个第一候选接入网设备的系统消息并确定所述第一能力信息。
  32. 根据权利要求30或31所述的通信装置，其特征在于，所述业务类型信息包括终端设备的业务类型，所述终端设备的业务类型包括如下一项或多项：能力降低、多播广播服务、车联万物、非公共网络。
  33. 一种通信装置，其特征在于，包括：接收模块和发送模块；其中，
    所述接收模块，用于接收来自源接入网设备的能力信息请求；其中，所述能力信息请求包括至少一个第一候选接入网设备的标识和/或业务类型信息，所述能力信息请求用于请求第一能力信息，所述业务类型信息用于指示所述第一能力信息的范围；
    所述发送模块，用于向所述源接入网设备发送所述第一能力信息。
  34. 一种通信装置，其特征在于，所述通信装置包括：处理器和通信接口；其中，
    所述处理器，用于通过所述通信接口与其它装置通信，并执行如权利要求1-18中任一项所述的通信方法。
  35. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质包括计算机程序或指令，当所述计算机程序或指令在计算机上运行时，使得所述计算机执行如权利要求1-18中任一项所述的通信方法。
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