WO2022205453A1 - Procédé et appareil de sélection de réseau - Google Patents

Procédé et appareil de sélection de réseau Download PDF

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Publication number
WO2022205453A1
WO2022205453A1 PCT/CN2021/085392 CN2021085392W WO2022205453A1 WO 2022205453 A1 WO2022205453 A1 WO 2022205453A1 CN 2021085392 W CN2021085392 W CN 2021085392W WO 2022205453 A1 WO2022205453 A1 WO 2022205453A1
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Prior art keywords
network
layer network
indication information
terminal device
message
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PCT/CN2021/085392
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English (en)
Chinese (zh)
Inventor
朱强华
时书锋
Original Assignee
华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN202180034099.5A priority Critical patent/CN115552928A/zh
Priority to PCT/CN2021/085392 priority patent/WO2022205453A1/fr
Publication of WO2022205453A1 publication Critical patent/WO2022205453A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services

Definitions

  • the present application relates to the field of communications, and, more particularly, to methods and apparatus for network selection.
  • a non-public network is a non-public 5G network that can rely on the network function implementation of a public land mobile network (PLMN), such as public network integrated NPN (public network integrated NPN). , PNI-NPN), can also be implemented without relying on PLMN network functions, such as independent deployment of NPN (standalone NPN, SNPN).
  • PLMN public land mobile network
  • SNPN standalone NPN
  • the 3rd generation partnership project (3GPP) uses the non- 3rd generation partnership project interworking function (N3IWF) architecture in R16 to support the interworking between SNPN and PLMN, that is, user equipment (user equipment, UE) double subscription, respectively subscribed to the SNPN and the PLMN.
  • N3IWF non- 3rd generation partnership project interworking function
  • the UE performs 3GPP registration in the lower-layer network (the lower-layer network can be an SNPN) (access through the access network of the lower-layer network), establishes a protocol data unit (PDU) session in the SNPN, and then selects the N3IWF of the upper-layer network and The Internet Protocol Security (IPSec) connection of the N3IWF connected to the upper-layer network (the upper-layer network can be PLMN) is established through the PDU session in the SNPN, and the registration request is sent to the upper-layer network through the IPSec connection, so that the The upper layer network PLMN performs registration.
  • the lower-layer network can be an SNPN
  • PDU protocol data unit
  • IPSec Internet Protocol Security
  • the UE After the UE accesses the upper-layer network from the lower-layer network, when the UE initiates the IMS (IP multimedia core network subsystem, IMS) voice service through the upper-layer network, the service quality of the voice service is sometimes not guaranteed.
  • IMS IP multimedia core network subsystem
  • the present application provides a method and device for network selection, so that a terminal device can select a lower-layer network or an upper-layer network that can provide IMS voice service according to the indication information, and ensure the service quality of the terminal device using the Internet Protocol Multimedia Network Subsystem IMS voice service. .
  • a method for network selection is provided.
  • the method may be performed by a mobility management network element of the first upper layer network.
  • the method includes: acquiring second indication information, the second indication information indicating whether the first lower layer network can provide the Internet Protocol multimedia network through a packet switched (PS) session accessed by a new radio (new radio, NR) cell Subsystem IMS voice service; first indication information is determined according to the second indication information, and the first indication information indicates whether the first upper layer network can support the provision of IMS voice service through PS sessions accessed through non-3rd Generation Partnership Project N3GPP ; Send the first indication information to the terminal device.
  • PS packet switched
  • NR new radio
  • the mobility management network element of the first upper-layer network can know that the terminal device accesses the first upper-layer network through the first lower-layer network, and whether the first lower-layer network supports IMS voice services, and further determines the first upper-layer network. Whether the network can provide IMS voice service support for the terminal equipment, and notify the terminal equipment of this information, so that the terminal equipment can choose the network that can support the IMS voice service to initiate the IMS voice service, so as to obtain normal and guaranteed voice call quality.
  • the mobility management network element of the first upper layer network receives a registration request message from the terminal device or an N2 message from the N3GPP interworking function network element, where the registration request message or the N2 message includes the second indication information.
  • the mobility management network element of the first upper layer network acquires the second indication information according to local configuration.
  • the local configuration further includes an identifier of the first lower-layer network.
  • the mobility management network element of the first upper layer network receives a registration request message from the terminal device or an N2 message from the N3GPP interworking function network element, where the registration request message or the N2 message includes third indication information, the The third indication information indicates whether the terminal device accesses the first upper layer network through the protocol data unit PDU session of the first lower layer network, or the third indication information indicates the network identifier of the first lower layer network.
  • the mobility management network element of the first upper-layer network can determine the second indication information according to the locally configured service-level agreement (SLA) and the third indication information.
  • SLA service-level agreement
  • an SLA is configured in the N3GPP interworking function network element, the N3GPP interworking function network element receives an IPSec message from the terminal device, the IPSec message includes a registration request message, and the IPSec message also includes third indication information, the first The third indication information indicates whether the terminal device accesses the first upper layer network through the protocol data unit PDU session of the first lower layer network, or the third indication information indicates the network identifier of the first lower layer network, or the N3GPP interworking function
  • the network element is a dedicated N3GPP interworking function network element, and the third indication information is determined according to the local configuration. According to the third indication information and the SLA, the second indication information is determined, and then the second indication information is sent to the mobility management network element of the first upper layer network through the N2 message.
  • a method for network selection is provided.
  • the method may be performed by a mobility management network element of the first underlying network.
  • the method includes: determining second indication information, the second indication information indicating whether the first lower layer network can provide the Internet Protocol Multimedia Network Subsystem IMS voice service through the packet-switched PS session accessed by the new air interface NR cell; the second indication information.
  • the mobility management network element of the first lower-layer network informs the mobility management network element of the first upper-layer network whether the first lower-layer network can support the IMS voice service through the second indication information, so that the mobility of the first upper-layer network
  • the performance management network element may further determine whether the first upper layer network can provide support for the IMS voice service for the terminal device accessing the first upper layer network through the first lower layer network, and notify the terminal device of this information. It enables the terminal device to select a network that can support the provision of IMS voice services to initiate IMS voice services, so as to obtain normal and guaranteed voice call quality.
  • the second indication information is determined according to the local configuration and the capability of the terminal device.
  • the second indication information may also be determined according to the data network name DNN of the session of the terminal device, and the single network slice selection auxiliary information S-NSSAI.
  • the second message further includes the capability of the terminal device.
  • the second message does not carry the capability of the terminal device, receive a first message from the access network device of the first lower layer network, where the first message includes the capability of the terminal device.
  • the second indication information from the access network device may be carried in the first message.
  • a method for network selection is provided.
  • the method may be executed by a terminal device, or may also be executed by a chip or circuit configured in the terminal device, which is not limited in this application.
  • the method includes: receiving second indication information from a mobility management network element of a first lower layer network, the second indication information indicating that the first lower layer network can provide the Internet through a packet-switched PS session accessed by a new air interface NR cell Protocol multimedia network subsystem IMS voice service; according to the second indication information, select the non-third generation partnership plan of the first upper layer network to access the N3GPP interworking function network element and pass the first lower layer network and the N3GPP interworking function network element Accessing the first upper layer network; receiving first indication information from a mobility management network element of the first upper layer network, where the first indication information indicates whether the first upper layer network can support providing IMS voice services through N3GPP PS sessions.
  • the terminal device after receiving the first indication information and the second indication information, selects the upper-layer network access that can support the IMS voice service according to the first indication information. If the first upper-layer network does not support the IMS voice service, select other The upper layer network that can support the IMS voice service is accessed, so that after the terminal device accesses the first lower layer network that can provide the IMS voice service, the service quality of the terminal device using the IMS voice service in the upper layer network is guaranteed.
  • the terminal device Select the first lower-level network.
  • the terminal device selects the second lower network before selecting the first lower network to access, and learns from the second lower network that the second lower network cannot provide IMS through the PS session accessed by the NR cell. Voice service, so choose to access the first lower layer network.
  • the terminal device when the second indication information indicates that the first lower-layer network can provide the IMS voice service through the PS session accessed by the NR cell, the terminal device will only send the second indication information to the mobility management network element of the first upper-layer network. .
  • the first indication information is determined by the mobility management network element of the first upper layer network. If the first lower layer network cannot provide the IMS voice service through the PS session accessed by the NR cell, the terminal device selects the lower layer network that can provide the IMS voice service through the PS session accessed by the NR cell.
  • the terminal device selects the N3GPP interworking function network element of the second upper layer network, and passes the N3GPP interworking function network element through the first layer network.
  • the lower-layer network and the N3GPP interworking function network element access the second upper-layer network; or, the terminal device accesses a third network through a 3GPP access type, where the third network includes the first upper-layer network.
  • the first indication information indicates that the first upper-layer network cannot support the PS session accessed through N3GPP to provide the IMS voice service.
  • the first lower-layer network supports the IMS voice service, but the first The upper-layer network does not support the IMS voice service.
  • the first lower-layer network does not support the IMS voice service, but the first upper-layer network supports the IMS voice service.
  • the terminal device needs to select the N3GPP interworking function network element of the third upper-layer network, and access the third upper-layer network through the first lower-layer network and the N3GPP interworking function network element of the third upper-layer network or directly through the network.
  • the terminal device needs to select the second lower layer network that can provide IMS voice service through the PS session accessed by the NR cell, or directly access the third network through the 3GPP access type (through the access network device).
  • the terminal device when the terminal device sends a registration request message to the mobility management network element of the first upper layer network or sends an Internet security protocol message to the N3GPP interworking function network element of the first upper layer network, it means that the first lower layer network
  • the IMS voice service can be provided through the PS session accessed by the NR cell. That is to say, the registration request message or the Internet security protocol message may implicitly indicate that the first lower-layer network can provide the IMS voice service through the PS session accessed by the NR cell.
  • this solution saves more signaling overhead.
  • the terminal device saves the first indication information; and selects the N3GPP interworking function network element of the first upper layer network according to the first indication information.
  • the terminal device determines according to the first indication information that the first upper layer network cannot support the PS session accessed through N3GPP to provide IMS voice services; the terminal device does not select the N3GPP interworking function network element of the first upper layer network.
  • a method for network selection is provided.
  • the method may be executed by an access network device of the first lower-layer network, or may also be executed by a chip or circuit configured in the access network device, which is not limited in this application.
  • the method includes: determining second indication information according to the local configuration and the capability of the terminal device, the second indication information indicating whether the first lower-layer network can provide the Internet Protocol Multimedia Network Subsystem through the packet-switched PS session accessed by the new air interface NR cell IMS voice service; the access network device of the first lower layer network sends the second indication information to the mobility management network element of the first lower layer network.
  • the access network device sends the second indication information of whether the first lower layer network can support the IMS voice service to the mobility management network element of the first lower layer network, so that the mobility management of the first lower layer network is enabled.
  • the network element can determine whether the first lower-layer network can support IMS voice services, and notify the terminal device whether the first lower-layer network can support IMS voice services, so that the terminal device can select a network that can support IMS voice services to access, ensuring the terminal The quality of service of the device using the IMS voice service.
  • the access network device of the first lower layer network accepts a second message from the mobility management network element of the first lower layer network, where the second message is used to query whether the first lower layer network can pass through
  • the PS session accessed by the NR cell provides IMS voice services.
  • the second message further includes the capability of the terminal device.
  • the access network device of the lower layer network sends a first message to the mobility management network element of the first lower layer network, where the first message includes the terminal device. device capability.
  • the access network device of the lower layer network sends capability request information to the terminal device, and the capability request information is used to request the capability of the terminal device; the lower layer network The access network device receives a third message from the terminal device, where the third message includes the capabilities of the terminal device.
  • an apparatus for network selection may be a mobility management network element of a first upper layer network.
  • the device includes a processing unit and a transceiver unit: the processing unit is configured to obtain second indication information, the second indication information indicating whether the first lower layer network can provide the Internet Protocol multimedia network through the packet-switched PS session accessed by the new air interface NR cell Subsystem IMS voice service; the processing unit is further configured to determine first indication information according to the second indication information, where the first indication information indicates whether the first upper-layer network can support access through non-3rd Generation Partnership Project N3GPP The PS session provides the IMS voice service; the transceiver unit sends the first indication information to the terminal device.
  • the apparatus can know whether the terminal device accesses the first upper layer network through the first lower layer network, and whether the first lower layer network supports the IMS voice service, and further determines whether the first upper layer network can provide the terminal device with Support IMS voice service, and notify the terminal equipment of this information, so that the terminal equipment can choose the network that can support the IMS voice service to initiate the IMS voice service, so as to obtain the normal and guaranteed voice call quality.
  • the transceiver unit is further configured to receive a registration request message from the terminal device or an N2 message from an N3GPP interworking function network element, where the registration request message or the N2 message includes the second indication information.
  • the processing unit is specifically configured to acquire the second indication information according to the local configuration.
  • the local configuration further includes an identifier of the first lower-layer network.
  • the transceiver unit is further configured to receive a registration request message from the terminal device or an N2 message from an N3GPP interworking function network element, where the registration request message or the N2 message includes third indication information, and the third indication information indicates Whether the terminal device accesses the first upper layer network through the protocol data unit PDU session of the first lower layer network, or the third indication information indicates the network identifier of the first lower layer network.
  • the mobility management network element of the upper layer network can determine the second indication information according to the locally configured service level agreement SLA and the third indication information.
  • the solution has a simple process, saves signaling overhead, and is easier to implement.
  • an SLA is configured in the N3GPP interworking function network element, the N3GPP interworking function network element receives an IPSec message from the terminal device, the IPSec message includes a registration request message, and the IPSec message also includes third indication information, the first The third indication information indicates whether the terminal device accesses the first upper layer network through the protocol data unit PDU session of the first lower layer network, or the third indication information indicates the network identifier of the first lower layer network, or the N3GPP interworking function
  • the network element is a dedicated N3GPP interworking function network element, and the third indication information is determined according to the local configuration.
  • the second indication information is determined according to the third indication information and the service level agreement SLA, and then the second indication information is sent to the mobility management network element of the first upper layer network through an N2 message.
  • an apparatus for network selection is provided, where the apparatus may be a mobility management network element of a first lower layer network.
  • the device includes a processing unit and a transceiver unit: the processing unit is configured to determine second indication information, the second indication information indicating whether the first lower layer network can provide the Internet Protocol multimedia network through the packet-switched PS session accessed by the NR cell of the new air interface Subsystem IMS voice service; the transceiver unit is used to send the second indication information to the terminal device.
  • the device informs the mobility management network element of the first upper-layer network through the second indication information whether the first lower-layer network supports the IMS voice service, so that the mobility management network element of the first upper-layer network can further determine the first Whether the upper-layer network can provide IMS voice service support for terminal equipment accessing the first upper-layer network through the first lower-layer network, and notify the terminal equipment of this information. It enables the terminal device to select a network that can support the provision of IMS voice services to initiate IMS voice services, so as to obtain normal and guaranteed voice call quality.
  • the processing unit is specifically configured to determine the second indication information according to the local configuration and the capability of the terminal device.
  • the processing unit may also determine the second indication information according to the data network name DNN of the session of the terminal device, and the single network slice selection auxiliary information S-NSSAI.
  • the transceiver unit is further configured to receive a first message from an access network device of the first lower layer network, where the first message includes the capability of the terminal device.
  • the transceiver unit is further configured to send a second message to the access network device of the first lower layer network, where the second message is used to query whether the first lower layer network can access the PS session through the NR cell
  • the IMS voice service is provided; the transceiver unit is further configured to receive second indication information from the access network device.
  • the second message further includes the capability of the terminal device.
  • the second indication information from the access network device may be carried in the first message.
  • an apparatus for network selection is provided, and the apparatus may be a terminal device, or may also be a chip or circuit configured in the terminal device, which is not limited in this application.
  • the device includes a processing unit and a transceiving unit: the transceiving unit is configured to receive second indication information from a mobility management network element of the first lower layer network, where the second indication information indicates that the first lower layer network can pass the new air interface NR
  • the packet-switched PS session accessed by the cell provides the IMS voice service of the Internet Protocol Multimedia Network Subsystem;
  • the processing unit is configured to select, according to the second indication information, a non-third-generation partnership project of the first upper-layer network to access the N3GPP interworking function network element and access the first upper layer network through the first lower layer network and the N3GPP interworking function network element;
  • the transceiver unit is further configured to receive first indication information from the mobility management network element of the first upper layer network, the first The indication information indicates whether the first upper layer network can support providing IMS voice
  • the apparatus selects an upper-layer network access capable of supporting IMS voice service according to the first indication information, and if the first upper-layer network does not support IMS voice service, selects other The upper layer network that can support the IMS voice service is accessed, so that after the terminal device accesses the first lower layer network that can provide the IMS voice service, the service quality of the terminal device using the IMS voice service in the upper layer network is guaranteed.
  • the transceiver unit is further configured to receive fourth indication information from a mobility management network element of the second lower layer network, where the fourth indication information indicates that the second lower layer network cannot provide IMS through the PS session accessed by the NR cell. voice service; the processing unit is also used for selecting the first lower layer network.
  • the transceiver unit is further configured to send second indication information to the mobility management network element of the first upper layer network, where the second indication information is used for the mobility management network element of the first upper layer network to determine the first Instructions.
  • the terminal device when the second indication information indicates that the first lower-layer network can provide the IMS voice service through the PS session accessed by the NR cell, the terminal device will only send the second indication information to the mobility management network element of the first upper-layer network. .
  • the first indication information is determined by the mobility management network element of the first upper layer network. If the first lower layer network cannot provide the IMS voice service through the PS session accessed by the NR cell, the terminal device selects the lower layer network that can provide the IMS voice service through the PS session accessed by the NR cell.
  • the processing unit is configured to select the N3GPP interworking function network element of the second upper layer network, and pass the N3GPP interworking function network element.
  • the first lower-layer network and the N3GPP interworking function network element access the second upper-layer network; or, the processing unit is configured to access a third network through a 3GPP access type, where the third network includes the first upper-layer network.
  • the first indication information indicates that the first upper-layer network cannot support the PS session accessed through N3GPP to provide the IMS voice service.
  • the first lower-layer network supports the IMS voice service, but the first The upper-layer network does not support the IMS voice service.
  • the first lower-layer network does not support the IMS voice service, but the first upper-layer network supports the IMS voice service.
  • the processing unit needs to select the N3GPP interworking function network element of the third upper layer network, and access the third upper layer network through the N3GPP interworking function network element of the first lower layer network and the third upper layer network or directly.
  • the third network is accessed through the 3GPP access type (through the access network equipment).
  • the processing unit needs to select the second lower layer network that can provide IMS voice services through the PS session accessed by the NR cell, or directly access the third network through the 3GPP access type (through access network equipment). .
  • the transceiver unit is specifically configured to send a registration request message to the mobility management network element of the first upper layer network or send an Internet security protocol message to the N3GPP interworking function network element of the first upper layer network, the registration request message or The Internet Security Protocol message includes the second indication information.
  • the transceiver unit when the transceiver unit sends a registration request message to the mobility management network element of the first upper layer network or sends an Internet security protocol message to the N3GPP interworking function network element of the first upper layer network, it means that the first lower layer
  • the network can provide IMS voice services through the PS session accessed by the NR cell. That is to say, the registration request message or the Internet security protocol message may implicitly indicate that the first lower-layer network can provide the IMS voice service through the PS session accessed by the NR cell.
  • this solution saves more signaling overhead.
  • the transceiver unit is specifically configured to send a registration request message to the mobility management network element of the first upper layer network or send an Internet security protocol message to the N3GPP interworking function network element of the first upper layer network, the registration request message or
  • the Internet Security Protocol message includes third indication information, the third indication information indicates whether the terminal device accesses the first upper layer network through the protocol data unit PDU session of the first lower layer network, or the third indication information indicates the first upper layer network.
  • the network identifier of the underlying network is specifically configured to send a registration request message to the mobility management network element of the first upper layer network or send an Internet security protocol message to the N3GPP interworking function network element of the first upper layer network, the registration request message or
  • the Internet Security Protocol message includes third indication information, the third indication information indicates whether the terminal device accesses the first upper layer network through the protocol data unit PDU session of the first lower layer network, or the third indication information indicates the first upper layer network.
  • the network identifier of the underlying network is specifically configured to send a registration
  • the apparatus further includes a storage unit configured to store the first indication information; the processing unit is further configured to select an N3GPP interworking function network element of the first upper layer network according to the first indication information.
  • the processing unit is configured to determine, according to the first indication information, that the first upper layer network cannot support the PS session accessed through N3GPP to provide the IMS voice service; the processing unit does not select the N3GPP interworking function network element of the first upper layer network .
  • the transceiver unit is further configured to receive capability request information from the access network device of the lower layer network, where the capability request information is used to request the capability of the terminal device; the transceiver unit is further configured to access the lower layer network
  • the network device sends a third message, where the third message includes the capabilities of the terminal device.
  • an apparatus for network selection may be an access network device of the first lower-layer network, or may also be a chip or circuit configured in the access network device, which is not limited in this application.
  • the apparatus includes a processing unit and a transceiver unit: the processing unit is configured to determine the second indication information according to the local configuration and the capability of the terminal device, where the second indication information indicates whether the first lower layer network can access the packet through the new air interface NR cell
  • the PS session is exchanged to provide the Internet Protocol Multimedia Network Subsystem IMS voice service;
  • the transceiver unit is configured to send the second indication information to the mobility management network element of the first lower layer network.
  • the device sends the second indication information of whether the first lower layer network can support the IMS voice service to the mobility management network element of the first lower layer network, thereby enabling the mobility management network element of the first lower layer network to It can judge whether the first lower layer network can support IMS voice service, and notify the terminal device whether the first lower layer network can support IMS voice service, so that the terminal device can choose the network access that can support IMS voice service, and ensure the use of the terminal device. Quality of service for IMS voice services.
  • the transceiver unit is further configured to accept a second message from the mobility management network element of the first lower layer network, where the second message is used to query whether the first lower layer network can be accessed through the NR cell.
  • PS sessions provide IMS voice services.
  • the transceiver unit is further configured to send a first message to a mobility management network element of the first lower layer network, where the first message includes the capability of the terminal device.
  • the transceiver unit is further configured to send capability request information to the terminal device, where the capability request information is used to request the capability of the terminal device; the transceiver unit is further configured to receive a third message from the terminal device, the first Three messages include the capabilities of the terminal device.
  • the second message further includes the capability of the terminal device.
  • a communication device including a processor.
  • the processor is coupled to the memory and can be used to execute instructions in the memory, so as to implement any one of the above-mentioned first to fourth aspects and any one of possible implementations of any of the first to fourth aspects method.
  • the communication device further includes a memory.
  • the communication device further includes a communication interface to which the processor is coupled, and the communication interface is used for inputting and/or outputting information.
  • the information includes at least one of instructions and data.
  • the communication apparatus is a mobility management network element, an access network device or a terminal device.
  • the communication interface may be a transceiver, or an input/output interface.
  • the communication device is a chip or a system of chips.
  • the communication interface may be an input/output interface, an interface circuit, an output circuit, an input circuit, a pin or a related circuit on the chip or a chip system.
  • the processor may also be embodied as processing circuitry or logic circuitry.
  • the communication apparatus is a chip or a chip system configured in a mobility management network element, an access network device or a terminal device.
  • the transceiver may be a transceiver circuit.
  • the input/output interface may be an input/output circuit.
  • a processor comprising: an input circuit, an output circuit and a processing circuit.
  • the processing circuit is configured to receive a signal through the input circuit and transmit a signal through the output circuit, so that the processor performs the method of the first aspect to the fourth aspect and any one of possible implementations of the first aspect to the fourth aspect .
  • the above-mentioned processor may be one or more chips
  • the input circuit may be input pins
  • the output circuit may be output pins
  • the processing circuit may be transistors, gate circuits, flip-flops and various logic circuits, etc. .
  • the input signal received by the input circuit may be received and input by, for example, but not limited to, a receiver
  • the signal output by the output circuit may be, for example, but not limited to, output to and transmitted by a transmitter
  • the circuit can be the same circuit that acts as an input circuit and an output circuit at different times.
  • the embodiments of the present application do not limit the specific implementation manners of the processor and various circuits.
  • a processing apparatus including a processor and a memory.
  • the processor is configured to read the instructions stored in the memory, and can receive signals through the receiver and transmit signals through the transmitter, so as to execute the first aspect to the fourth aspect and any possible implementation manner of the first aspect to the fourth aspect method in .
  • the processor is one or more, and the memory is one or more.
  • the memory may be integrated with the processor, or the memory may be provided separately from the processor.
  • the memory can be a non-transitory memory, such as a read only memory (ROM), which can be integrated with the processor on the same chip, or can be separately set in different On the chip, the embodiment of the present application does not limit the type of the memory and the setting manner of the memory and the processor.
  • ROM read only memory
  • the relevant data interaction process such as sending indication information
  • receiving capability information may be a process of receiving input capability information by the processor.
  • the data output by the processor can be output to the transmitter, and the input data received by the processor can be from the receiver.
  • the transmitter and the receiver may be collectively referred to as a transceiver.
  • the processing device in the eleventh aspect above may be one or more chips.
  • the processor in the processing device may be implemented by hardware or by software.
  • the processor can be a logic circuit, an integrated circuit, etc.; when implemented by software, the processor can be a general-purpose processor, implemented by reading software codes stored in a memory, which can Integrated in the processor, can be located outside the processor, independent existence.
  • a twelfth aspect provides a computer program product, the computer program product comprising: a computer program (also referred to as code, or instructions), when the computer program is executed, causes the computer to execute the above-mentioned first to fourth aspects Aspects and methods of any possible implementations of the first to fourth aspects.
  • a computer program also referred to as code, or instructions
  • a computer-readable storage medium stores a computer program (also referred to as code, or instruction), when it runs on a computer, causing the computer to execute the above-mentioned first aspect
  • a computer program also referred to as code, or instruction
  • the method in any one of the possible implementation manners of the fourth aspect and the first aspect to the fourth aspect.
  • a communication system including the above-mentioned mobility management network element of the first lower layer network and an access network device of the first lower layer network.
  • the communication system further includes a mobility management network element and a terminal device of the first upper layer network.
  • FIG. 1 is a schematic diagram of a network architecture provided by an embodiment of the present application.
  • FIG. 2 is a schematic diagram of a network scenario architecture applicable to an embodiment of the present application.
  • FIG. 3 is a schematic diagram of another network scenario architecture applicable to the embodiment of the present application.
  • FIG. 4 is a schematic flowchart of a method 200 for network selection provided by an embodiment of the present application.
  • FIG. 5 is a schematic flowchart of another method 300 for network selection provided by an embodiment of the present application.
  • FIG. 6 is a schematic flowchart of a method for obtaining whether an underlying network supports an IMS voice service according to an embodiment of the present application.
  • FIG. 7 is a schematic flowchart of another method for obtaining whether an underlying network supports an IMS voice service according to an embodiment of the present application.
  • FIG. 8 is a schematic flowchart of another method 400 for network selection provided by an embodiment of the present application.
  • FIG. 9 is a schematic flowchart of another method 500 for network selection provided by an embodiment of the present application.
  • FIG. 10 is a schematic flowchart of another method 600 for network selection provided by an embodiment of the present application.
  • FIG. 11 is a schematic flowchart of another method 700 for network selection provided by an embodiment of the present application.
  • FIG. 12 is a schematic flowchart of another method 800 for network selection provided by an embodiment of the present application.
  • FIG. 13 is a schematic flowchart of another method 900 for network selection provided by an embodiment of the present application.
  • FIG. 14 is a schematic block diagram of a communication apparatus provided by an embodiment of the present application.
  • FIG. 15 is a schematic block diagram of another communication apparatus provided by an embodiment of the present application.
  • FIG. 16 is a schematic diagram of a communication apparatus provided by an embodiment of the present application.
  • FIG. 17 is a schematic diagram of another communication apparatus provided by an embodiment of the present application.
  • FIG. 1 is a schematic diagram of a network architecture provided by an embodiment of the present application.
  • the network architecture may include user equipment 110, (wireless) access network equipment 120, user plane network element 130, data network 140, authentication server 150, mobility management network element 160, session management network element 170.
  • Application network element 180 unified data management network element 190, policy control network element 191, network function storage library function network element 192, network opening network element 193, network slice selection function network element 194, and the like.
  • Each network element involved in the network architecture will be described separately below.
  • User equipment may also be referred to as terminal, access terminal, subscriber unit, subscriber station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, wireless communication device, user agent, or user device.
  • the terminal in the embodiments 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, an augmented reality (AR) terminal, an industrial Wireless terminal in industrial control, wireless terminal in self driving, wireless terminal in remote medical, wireless terminal in smart grid, transportation safety wireless terminal in smart city, wireless terminal in smart home, wireless terminal in smart home, cellular phone, cordless phone, session initiation protocol (SIP) phone, wireless local loop ( wireless local loop (WLL) stations, personal digital assistants (PDAs), handheld devices with wireless communication capabilities, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, in 5G networks Terminals or terminals in future evolution networks, etc.
  • SIP session initiation protocol
  • wearable devices can also be called wearable smart devices, which is a general term for the intelligent design of daily wear and the development of wearable devices using wearable technology, such as glasses, gloves, watches, clothing and shoes.
  • a wearable device is a portable device that is worn directly on the body or integrated into the user's clothing or accessories.
  • Wearable device is not only a hardware device, but also realizes powerful functions through software support, data interaction, and cloud interaction.
  • wearable smart devices include full-featured, large-scale, complete or partial functions without relying on smart phones, such as smart watches or smart glasses, and only focus on a certain type of application function, which needs to cooperate with other devices such as smart phones. Use, such as all kinds of smart bracelets, smart jewelry, etc. for physical sign monitoring.
  • (wireless) access network equipment (radio access network, (R)AN) 120 access network equipment can also be called access equipment, (R)AN can manage wireless resources and provide access services for user equipment, After completing the forwarding of user equipment data between the user equipment and the core network, the (R)AN can also be understood as a base station in the network.
  • the access network device in this embodiment of the present application may be any communication device having a wireless transceiver function for communicating with user equipment.
  • the access network equipment includes but is not limited to: evolved Node B (evolved Node B, eNB), radio network controller (radio network controller, RNC), Node B (Node B, NB), base station controller (base station controller) , BSC), base transceiver station (base transceiver station, BTS), home base station (home evolved NodeB, HeNB, or home Node B, HNB), baseband unit (baseBand unit, BBU), wireless fidelity (wireless fidelity, WIFI)
  • the access point (AP), wireless relay node, wireless backhaul node, transmission point (TP) or transmission and reception point (TRP) in the system can also be 5G,
  • a gNB may include a centralized unit (CU) and a DU.
  • the gNB may also include an active antenna unit (AAU).
  • the CU implements some functions of the gNB, and the DU implements some functions of the gNB.
  • the CU is responsible for processing non-real-time protocols and services, and implementing functions of radio resource control (RRC) and packet data convergence protocol (PDCP) layers.
  • RRC radio resource control
  • PDCP packet data convergence protocol
  • the DU is responsible for processing physical layer protocols and real-time services, and implementing the functions of the radio link control (RLC) layer, the media access control (MAC) layer and the physical (PHY) layer.
  • RLC radio link control
  • MAC media access control
  • PHY physical layer
  • the information of the RRC layer is generated by the CU, and will eventually become the PHY layer information through the PHY layer encapsulation of the DU, or is converted from the information of the PHY layer. Therefore, under this architecture, higher-layer signaling, such as RRC layer signaling, can also be considered to be sent by DU, or sent by DU+AAU.
  • the access network device may be a device including one or more of a CU node, a DU node, and an AAU node.
  • the CU can be divided into access network equipment in the access network (radio access network, RAN), and the CU can also be divided into the access network equipment in the core network (core network, CN), this application does not Do limit.
  • User plane network element 130 As an interface with the data network, it completes functions such as user plane data forwarding, session/stream level-based charging statistics, and bandwidth limitation. That is, packet routing and forwarding and quality of service (QoS) processing of user plane data.
  • QoS quality of service
  • the user plane network element may be a user plane function (UPF) network element.
  • UPF user plane function
  • Data network 140 Provides, for example, operator services, Internet access or third-party services, including a server, which implements video source encoding, rendering, and the like.
  • the data network may be a data network (DN).
  • Authentication server 150 Perform user security authentication.
  • the authentication server may be an authentication server function (authentication server function, AUSF).
  • Mobility management network element 160 mainly used for mobility management and access management.
  • the access management network element may be an access and mobility management function (AMF), which mainly performs functions such as mobility management and access authentication/authorization. In addition, it is also responsible for transferring user policies between terminals and policy control function (PCF) network elements.
  • AMF access and mobility management function
  • PCF policy control function
  • Session management network element 170 mainly used for session management, network interconnection protocol (IP) address allocation and management of user equipment, selection and management of user plane functions, policy control and charging function interface termination point and downlink data notification, etc.
  • IP network interconnection protocol
  • the session management network element may be a session management function (SMF) network element, which completes terminal IP address allocation, UPF selection, and charging and QoS policy control.
  • SMF session management function
  • Application network element 180 In the 5G communication system, the application network element may be an application function (AF) network element, which represents the application function of a third party or an operator, and is an interface for the 5G network to obtain external application data. It is mainly used to transmit the requirements of the application side to the network side.
  • AF application function
  • Unified data management network element 190 responsible for the management of user identification, subscription data, authentication data, and registration management of user service network elements.
  • the unified data management network element may be unified data management (UDM).
  • Policy control network element 191 including user subscription data management functions, policy control functions, charging policy control functions, quality of service (quality of service, QoS) control, etc., a unified policy framework for guiding network behavior, and is a control plane.
  • Functional network elements such as AMF, SMF network elements, etc. provide policy rule information and the like.
  • the policy control network element may be a PCF.
  • Network slice selection function network element 194 responsible for selecting network slices for the UE.
  • the application network element may be a network slice selection function (NSSF) network element.
  • NSSF network slice selection function
  • the network function storage library function network element 192 provides a storage function and a selection function of network function entity information for other core network elements.
  • the network element may be a network function repository function (NRF).
  • Network open network element 193 In the 5G communication system, the network open network element can be a network element function (NEF) network element, which is mainly used to expose the services and capabilities of the 3GPP network function to the AF, and also AF can be made to provide information to 3GPP network functions.
  • NEF network element function
  • the above-mentioned network elements or devices may still use their names in the 5G communication system, or may have other names, which are not limited in this embodiment of the present application.
  • the functions of the above network elements or devices may be performed by an independent network element, or may be performed jointly by several network elements.
  • network elements in the core network may be deployed on the same or different physical devices.
  • AMF and SMF can be deployed on the same physical device.
  • the network elements of the 5G core network can be deployed on the same physical device as the network elements of the 4G core network. This embodiment of the present application does not limit this.
  • FIG. 1 is only an example, and does not constitute any limitation to the protection scope of the present application.
  • the communication method provided by the embodiment of the present application may also involve network elements not shown in FIG. 1 .
  • the communication method provided by the embodiment of the present application may also only include some of the network elements shown in FIG. 1 .
  • the terminal is connected to the AMF through the N1 interface
  • the (R)AN is connected to the AMF through the N2 interface
  • the (R)AN is connected to the UPF through the N3 interface.
  • the UPFs are connected through the N9 interface, and the UPFs are interconnected with the DN through the N6 interface.
  • the SMF controls the UPF through the N4 interface.
  • FIG. 2 and FIG. 3 are schematic structural diagrams of a dual user subscription provided by an embodiment of the present application.
  • R16 uses the N3IWF architecture to support the intercommunication between SNPN and PLMN, that is, the UE double-subscribes and subscribes to the SNPN and PLMN respectively.
  • the UE accesses the PLMN through the 3GPP access type, that is, the UE accesses the PLMN through the access network device of the PLMM.
  • the UE establishes a PDU session in the PLMN, selects the N3IWF network element of the SNPN network, and establishes an N3IWF network element that accesses the SNPN through the PDU session in the PLMN, and establishes an IPSec connection with the N3IWF of the SNPN, so as to access the N3GPP access type.
  • Access through the N3GPP access type refers to that the UE accesses the network through the N3IWF network element with the N3GPP access type.
  • FIG. 3 and FIG. 2 is that the UE first accesses the SNPN through the 3GPP access type, and then accesses the PLMN through the N3GPP access type.
  • the network accessed by the UE through the 3GPP access type is used as the underlying network, which is also referred to as the lower layer network in this embodiment, and the network accessed through the N3GPP access type is used in this implementation.
  • the upper network it is also called the upper network.
  • the upper layer network in FIG. 2 is SNPN and the lower layer network is PLMN
  • the upper layer network in FIG. 3 is PLMN and the lower layer network is SNPN.
  • the lower layer network can also be called the bottom layer network
  • the upper layer network can also be called the overlay network.
  • Fig. 2 and Fig. 3 are only an example, the upper-layer network and the lower-layer network can also be other networks, or the upper-layer network and the lower-layer network can also be the same, which is not limited in this application.
  • the non-public network PNI-NPN can be implemented using network slicing in the PLMN.
  • the closed access group (CAG) function is used.
  • the CAG can identify a group of users who are allowed to access the cell associated with the CAG, ie the CAG cell.
  • the CAG cell broadcasts one or more CAG identities, and the available CAG list and indication information are configured on the UE.
  • the indication information indicates whether the UE is only allowed to pass through the CAG cell.
  • the UE subscription data on the UDM includes the available CAG list and the indication information.
  • the SNPN network is independently deployed and does not depend on the PLMN network. It uses a common identifier of PLMN identifier + network identifier, where the PLMN identifier can be an inherent value reserved by a third-party operator, or it can be a specific value of the PLMN operator that deploys the SNPN.
  • the SNPN network its cell broadcasts the PLMN identity + network identity, and the UE selects the NPN network to access according to the broadcast information and the configured network selection information. If the UE finds that the configured network selection information (PLMN ID + network ID) is different from the PLMN ID or PLMN ID + network ID broadcast by the network, the UE will not select this network to access.
  • the PLMN can support IMS voice service.
  • the AMF can provide the service according to the local policy, UE capability, roaming agreement, whether to support single radio voice call continuity (SRVCC) and the (R)AN
  • At least one of the voice support matching indication information determines whether the voice service is supported, and sends the indication information (IMS voice over PS Session Supported) to the UE whether it can support the IMS voice service provided by the PS session accessed through 3GPP Indication over 3GPP) and the indication information (IMS voice over PS Session Supported Indication over N3GPP) and whether it can support the PS session accessed through N3GPP to provide IMS voice service, so that the subsequent UE can initiate IMS voice service in the PLMN network according to the indication information.
  • the AMF does not have voice support matching indication information locally, the information can be obtained from the (R)AN, and the (R)AN can determine the
  • the voice-centric UE needs to reselect a network capable of supporting the IMS voice service.
  • the AMF can directly send the indication information to the UE whether the PS session accessed through the N3GPP can provide the IMS voice service according to the local configuration. If the local configuration indicates that the PLMN can provide IMS voice services through the N3IWF/trusted non-3GPP gateway function (TNGF), the AMF instructs the UE to support the provision of IMS voice services through the PS session accessed through N3GPP.
  • TNGF non-3GPP gateway function
  • the upper-layer network is a PLMN, and the PLMN can support the provision of IMS voice services.
  • the PLMN can support the provision of IMS voice services.
  • the UE initiates IMS voice services
  • the lower-layer network does not support IMS voice services
  • the UE cannot guarantee the quality of service when performing IMS voice services. , which cannot provide users with a normal calling experience.
  • FIG. 4 is a schematic flowchart of a method 200 for network selection provided by an embodiment of the present application.
  • the method 200 includes:
  • Step S210 the mobility management network element #1 of the first upper layer network acquires second indication information, the second indication information indicates whether the first lower layer network can provide IMS voice service through the PS session accessed by the NR cell.
  • the mobility management network element #1 of the first upper layer network receives a registration request message from the terminal device or an N2 message from the N3GPP interworking function network element, where the registration request message or the N2 message includes
  • the second indication information indicates whether the first lower layer network can provide the IMS voice service through the PS session accessed by the NR cell.
  • the mobility management network element #1 of the first upper layer network receives the registration request message from the terminal device or the N2 message from the N3GPP interworking function network element, the registration request message or the N2 message Including third indication information, the third indication information indicates whether the terminal device accesses the first upper-layer network through the protocol data unit PDU session of the first lower-layer network, or the third indication information indicates that the first lower-layer network network identity.
  • the mobility management network element #1 of the upper layer network determines the second indication information according to the locally configured SLA and the third indication information.
  • the local configuration of the mobility management network element #1 of the upper layer network further includes the identifier of the first lower layer network.
  • the N3GPP interworking function network element is configured with an SLA
  • the N3GPP interworking function network element receives an IPSec message from the terminal device
  • the IPSec message includes a registration request message
  • the IPSec message further includes a third indication information
  • the third indication information indicates whether the terminal device accesses the first upper layer network through the protocol data unit PDU session of the first lower layer network, or the third indication information indicates the network identifier of the first lower layer network
  • the N3GPP interworking function network element is a dedicated N3GPP interworking function network element, and the N3GPP interworking function network element determines the third indication information according to the local configuration.
  • the N3GPP interworking function network element determines the second indication information according to the third indication information and the SLA, and then sends the second indication information to the mobility management network element #1 of the first upper layer network through an N2 message.
  • Step S220 the mobility management network element #1 of the first upper layer network determines first indication information according to the second indication information, where the first indication information indicates whether the first upper layer network can support the PS session accessed through N3GPP to provide IMS voice business.
  • the mobility management network element #1 of the first upper-layer network determines the first lower-layer network according to the second indication information. Indication information, the first indication information indicates that the first upper layer network cannot support the PS session accessed through the N3GPP to provide the IMS voice service. If the second indication information indicates that the first lower-layer network can provide the IMS voice service through the PS session accessed by the NR cell, the mobility management network element #1 of the first upper-layer network determines the first Indication information, where the first indication information indicates whether the first upper layer network can support providing IMS voice services through a PS session accessed through N3GPP.
  • the second indication information indicates that the first lower-layer network can provide the IMS voice service through the PS session accessed by the NR cell
  • the mobility management network element #1 of the first upper-layer network determines the first upper-layer network according to the local configuration If the IMS voice service can be supported
  • the first indication information indicates that the first upper-layer network can support the PS session accessed through N3GPP to provide the IMS voice service
  • the mobility management network element #1 of the first upper-layer network determines the first An upper layer network cannot support the IMS voice service
  • the first indication information indicates that the first upper layer network cannot support the provision of the IMS voice service through the PS session accessed through N3GPP.
  • Step S230 the mobility management network element #1 of the first upper layer network sends the first indication information to the terminal device.
  • the mobility management network element #1 of the first upper layer network sends the first indication information to the terminal device through a registration response message or a NAS transmission message.
  • the terminal device receives the first indication information. If the first indication information indicates that the first upper layer network can support the PS session accessed through N3GPP to provide the IMS voice service, the terminal device can subsequently initiate the IMS voice service on the first upper layer network.
  • the first indication information indicates that the first upper-layer network cannot support the PS session accessed through N3GPP to provide IMS voice services: the first indication information indicates that the first upper-layer network cannot support the PS session accessed through N3GPP to provide IMS voice services.
  • the first lower-layer network supports the IMS voice service, but the first upper-layer network does not support the IMS voice service; in the second case, the first lower-layer network does not support the IMS voice service, but the first The upper layer network supports IMS voice services.
  • the terminal device needs to select the N3GPP interworking function network element of other upper-layer network that can support the IMS voice service, and access the upper-layer network through the first lower-layer network and the N3GPP interworking function network element of the upper-layer network or directly.
  • the third network is accessed through the 3GPP access type, and the third network includes the first upper layer network.
  • the terminal device needs to select the second lower layer network that can provide IMS voice service through the PS session accessed by the NR cell, or directly access the third network through the 3GPP access type. The terminal device can distinguish the above two situations according to the first indication information.
  • the first indication information may be indicated by 2 bits.
  • the first bit indicates whether the first upper layer network can support the PS session accessed through N3GPP to provide IMS voice services
  • the second bit indicates the first lower layer network. Whether the layer network can provide IMS voice services through the PS session accessed by the NR cell.
  • the value of the first bit is set to 1, indicating that the first upper-layer network can support the PS session accessed through N3GPP to provide IMS voice services, and the value of the first bit is set to 0, indicating that the first upper-layer network cannot support N3GPP access. PS sessions provide IMS voice services.
  • the value of the second bit is set to 1, indicating that the first lower-layer network can provide IMS voice services through the PS session accessed by the NR cell, and the value of the second bit is set to 0, indicating that the first lower-layer network cannot be accessed through the NR cell.
  • the incoming PS session provides IMS voice services.
  • the first bit can also indicate whether the first lower-layer network can provide IMS voice services through the PS session accessed by the NR cell
  • the second bit can indicate whether the first upper-layer network can support providing IMS through the PS session accessed through N3GPP. voice business.
  • the value of the bit is set to 0 to indicate that the IMS voice service is supported.
  • the mobility management network element of the first upper layer network can know whether the first lower layer network can support the IMS voice service, further determine whether the first upper layer network can support the IMS voice service, and notify this information
  • the terminal device enables the terminal device to select a network that can support the provision of IMS voice services to initiate IMS voice services, so as to obtain normal and guaranteed voice call quality.
  • FIG. 5 is a schematic flowchart of another method 300 for network selection provided by an embodiment of the present application.
  • the method 300 includes:
  • Step S310 the terminal device registers with the first lower-layer network through the access network device.
  • the terminal device will obtain an indication that the first lower layer network sends to the terminal device during this registration process to provide an IMS voice service (IMS voice over PS session support indication) through the PS session, and this instruction represents the first lower layer.
  • IMS voice over PS session support indication IMS voice over PS session support indication
  • the network can provide IMS voice services for terminal devices through NR cells or fallback to evolved universal terrestrial radio access network (E-UTRAN).
  • E-UTRAN evolved universal terrestrial radio access network
  • the terminal device establishes a PDU session in the lower-layer network, and establishes an IPSec connection to the N3IWF of the target upper-layer network through the PDU session.
  • Step S320 the terminal device sends a registration request message to the N3IWF through the IPSec connection, and the N3IWF forwards the registration request message to the mobility management network element #1 of the first upper layer network through the N2 message.
  • Step S330 the mobility management network element #1 of the first upper layer network determines whether it can support the PS session accessed through the N3GPP to provide the indication information of the IMS voice service.
  • the mobility management network element #1 of the first upper layer network determines, according to the local configuration, whether it can support the indication information of whether the PS session accessed through the N3GPP can provide the IMS voice service.
  • Step S340 the mobility management network element #1 of the first upper layer network sends the indication information to the terminal device.
  • the indication information may be carried in the registration response message.
  • the indication information is different from the first indication information in the method 200.
  • the indication information is only determined according to the configuration of the first upper layer network, while the first indication information is jointly determined according to the first lower layer network and the first upper layer network.
  • Step S350 the terminal device acquires the second indication information.
  • the second indication information indicates whether the first lower-layer network can provide the IMS voice service through the PS session accessed by the NR cell.
  • step S350 includes:
  • Step S351 the terminal device sends NR capability query information to the access network device to query whether the access network device can support providing IMS voice services through the PS session of the NR cell.
  • the NR capability inquiry information may be an RRC NR Capability Enquiry message.
  • the terminal device can learn from step S340 that the terminal device is registered with the first upper layer network through the N3GPP of the first lower layer network, and the mobility management network element #1 of the first upper layer network determines to support access through N3GPP according to the local configuration
  • the PS session provides IMS voice services.
  • Step S352 the terminal device receives the NR capability information sent by the access network device, where the capability information carries the second indication information whether the PS session accessed through the NR cell can provide the IMS voice service.
  • the NR capability information may be an RRC NR Capability Information message.
  • the terminal device selects a lower layer network that can support the PS session accessed through the NR cell to provide the IMS voice service. If the lower-layer network that can support the IMS voice service provided by the PS session accessed through the NR cell is not successfully selected, the terminal device can also reside on a lower-layer network that does not support the IMS voice service, and then create an IMS voice service on the upper-layer network. QoS flow, but the terminal equipment resides in a certain lower layer network that does not support the IMS voice service, and the service quality of the IMS voice service cannot be guaranteed.
  • step S350 includes:
  • Step S351' the terminal device sends a registration request message to the mobility management network element #2 of the first lower-layer network, where the registration request message carries a query whether the access network device can support providing IMS voice services through the PS session of the NR cell instructions.
  • the terminal device can learn from step S340 that the terminal device is registered with the first upper layer network through the N3GPP of the first lower layer network, and the mobility management network element #1 of the first upper layer network determines the first upper layer network according to the local configuration Supports PS sessions accessed through N3GPP to provide IMS voice services.
  • Step S357 the mobility management network element #2 of the first lower layer network determines the second indication information.
  • the mobility management network element #2 of the first lower layer network is based on the above-mentioned instructions, local configuration, terminal capabilities, voice support matching indication information, data network name (DNN) of the terminal device session and a single network
  • At least one of slice selection assistance information (single network slice selection assistance information, S-NSSAI) and the like determines the second indication information.
  • Step S358 the mobility management network element #2 of the first lower-layer network sends the second indication information to the terminal device.
  • the mobility management network element #2 of the first lower layer network acquires the voice support matching indication information of the access network device of the first lower layer network.
  • the voice support of the access network device matches the indication information to determine the second indication information. Then, before step S357 and step S358, it also includes:
  • Step S352' the mobility management network element #2 of the first lower layer network sends a second message, the second message is used to request the access network device of the first lower layer network to check whether the PS accessed through the NR cell can be supported
  • the session provides an indication of IMS voice services.
  • the indication may be carried in an N2 message, such as a UE Capability Match Request message.
  • the second message may also carry the capability of the terminal device.
  • Step S353 if the second message does not carry the capability of the terminal device, the access network device of the first lower layer network sends capability inquiry information to the terminal device, for example, the access network device sends an RRC UE Capability Enquiry message to the terminal device. , to request the capabilities of the end device.
  • Step S354 the terminal device sends a third message to the access network device of the first lower-layer network, where the third message includes the capability of the terminal device.
  • the third message may be an RRC UE Capability Information message.
  • Step S355 the access network device determines the second indication information according to the local configuration and the capability of the terminal device.
  • Step S356 the access network device sends the second indication information to the mobility management network element #2 of the first lower-layer network.
  • the second indication information may be carried in the first message.
  • the first message may be a UE Capability Match Request message. If the second message in step S352' does not carry the capability of the terminal device, the first message also needs to carry the capability of the terminal device.
  • the second indication information determined by the access network device in the above steps sends the second indication information to the mobility management network element #2 of the first lower-layer network, and the mobility management network of the first lower-layer network
  • the second indication information sent by element #2 to the terminal equipment all indicate whether the first lower-layer network can support the PS session accessed through the NR cell to provide IMS voice services, but the forms may be the same or different.
  • step S350 the terminal device obtains the second indication information in step S310, and the obtaining method is the same as that in FIG. 6 or FIG. Figures 6 and 7 are respectively two ways in which the terminal device obtains the second indication information in step S350 in Figure 5, and the steps in Figures 8 to 13 related to the terminal device obtaining the second indication information can refer to the above-mentioned diagrams. 6 or the description of Figure 7.
  • FIG. 8 is a schematic flowchart of another method 400 for network selection provided by an embodiment of the present application.
  • the method 400 includes:
  • Step S410 is the same as step S310 in FIG. 5 .
  • Step S420 the terminal device sends a registration request to the mobility management network element #1 of the first upper layer network.
  • the terminal device sends the registration request message to the N3IWF through the IPSec connection, and the N3IWF forwards the registration request message to the mobility management network element #1 of the first upper layer network through the N2 message.
  • the registration request message or the N2 message carries an indication that the terminal device registers with the first lower-layer network. Therefore, the mobility management network element #1 of the first upper-layer network can learn that the terminal device accesses the N3IWF through the first lower-layer network (through the above-mentioned instruction).
  • the mobility management network element #1 of the first upper layer network can learn that the terminal device accesses the N3IWF through the first lower layer network through a dedicated N3IWF (referring to a specific N3IWF, corresponding to a specific lower layer network).
  • the mobility management network element #1 of the first upper layer network sends a message for querying whether the first lower layer network can support the provision of IMS voice services through the PS session accessed by the NR cell.
  • the mobility management network element #1 of the first upper layer network sends a NAS message to the terminal device, and the NAS message carries an instruction requesting whether the first lower layer network supports IMS voice over PS session over NR cell.
  • the NAS message may be a registration response message or a NAS transport message.
  • the mobility management network element #1 of the first upper layer network sends an N2 message to the N3IWF, and the N2 message carries an instruction requesting whether the first lower layer network supports IMS voice over PS session over NR cell.
  • the N3IWF sends an IPSec message to the terminal device, and the IPSec message carries an instruction requesting whether the first lower layer network supports IMS voice over PS session over NR cell.
  • Step S430 is optional.
  • Step S440 the terminal device acquires the second indication information.
  • the second indication information indicates whether the first lower-layer network can provide the IMS voice service through the PS session accessed by the NR cell.
  • Step S440 may refer to the description of step S350.
  • Step S450 after acquiring the second indication information, the terminal device sends the second indication information to the mobility management network element #1 of the first upper layer network.
  • the second indication information may be carried in a NAS message.
  • the NAS message may be a registration request message or a NAS transport message.
  • the terminal device sends an IPSec message to the N3IWF, where the IPSec message includes the second indication information.
  • the N3IWF carries the second indication information in the N2 message and sends it to the mobility management network element #1 of the first upper layer network.
  • the terminal device sends the first lower-layer network to the mobility management network element #1 of the first upper-layer network. 2. Instruction information.
  • Step S460 the mobility management network element #1 of the first upper layer network determines the first indication information according to the second indication information and the local configuration.
  • the first indication information indicates whether the first upper layer network can support providing IMS voice services through a PS session accessed through N3GPP.
  • the second indication information indicates that the first lower-layer network can support the PS session accessed through the NR cell to provide the IMS voice service, if the mobility management network element #1 of the first upper-layer network is configured according to the local configuration It is determined that the first upper layer network does not support the IMS voice service, and the first indication information indicates that the first upper layer network cannot support the PS session accessed through N3GPP to provide the IMS voice service; if the mobility management network element #1 of the first upper layer network according to If the local configuration determines that the first upper layer network supports the IMS voice service, the first indication information indicates that the first upper layer network can support the PS session accessed through the N3GPP to provide the IMS voice service.
  • the second indication information indicates that the first lower-layer network cannot support the PS session accessed through the NR cell to provide IMS voice services.
  • the first indication information indicates that the first upper-layer network cannot support the provision of the IMS voice service through the PS session accessed through N3GPP.
  • Step S470 the mobility management network element #1 of the first upper layer network sends the first indication information to the terminal device.
  • the first indication information is sent through a registration request message or a response message of a NAS transmission message.
  • the terminal device if the terminal device receives the first indication information indicating that the first upper layer network supports the provision of IMS voice services through a PS session accessed through N3GPP, the terminal device initiates an IMS voice service request on the first upper layer network.
  • the terminal device may re-select the network.
  • the first indication information indicates that the first upper-layer network cannot support the PS session accessed through N3GPP to provide the IMS voice service.
  • the first lower-layer network supports the IMS voice service, but the first The upper-layer network does not support the IMS voice service.
  • the first lower-layer network does not support the IMS voice service, but the first upper-layer network supports the IMS voice service.
  • the terminal device needs to select the N3GPP interworking function network element of other upper-layer network capable of supporting the IMS voice service, and access the upper-layer network through the first lower-layer network and the N3GPP interworking function network element of the upper-layer network.
  • the terminal device selects the N3GPP interworking function network element of the second upper layer network, and accesses the second upper layer network through the first lower layer network and the N3GPP interworking function network element. It should be noted that the terminal device may also perform steps S410-S470 of the method 400 to obtain an indication of whether the second upper layer network can support providing IMS voice services through a PS session accessed through N3GPP. Optionally, if the second upper-layer network can support providing IMS voice services through a PS session accessed through N3GPP, the terminal device initiates an IMS voice service request on the second upper-layer network after accessing the second upper-layer network through the first lower-layer network.
  • the terminal device needs to select the second lower layer network that can provide the IMS voice service through the PS session accessed by the NR cell.
  • the terminal device may perform some steps of the method in this embodiment to obtain an indication of whether the second lower layer network can provide the IMS voice service through the PS session accessed by the NR cell.
  • steps S410-S470 will be performed again, wherein the first lower layer network is replaced with the second lower layer network.
  • the terminal device obtains the first indication information.
  • the terminal device may execute S440 to obtain an indication of whether the second lower layer network can provide the IMS voice service through the PS session accessed by the NR cell.
  • the terminal device may also perform S450-S470 to send an indication of whether the second lower-layer network can provide IMS voice services through the PS session accessed by the NR cell to the mobility management network element #1 of the first upper-layer network, to obtain first indication information.
  • the terminal device may also access a third network through a 3GPP access type, where the third network includes the first upper-layer network.
  • the terminal device initiates an IMS voice service request in the third network.
  • the terminal device may repeat the process of network selection until it selects a lower-layer network or an upper-layer network that supports providing IMS voice services through a PS session accessed through an NR cell.
  • the terminal device may choose to use the above-mentioned yet another possible manner, that is, Access the first upper layer network through the 3GPP access type. It should be understood that in step S440, the terminal device obtains the second indication information in step S410, and the obtaining method is the same as that in FIG. 6 or FIG. This application does not impose any restrictions on the timing of acquiring the first indication information and the second indication information by the terminal device.
  • the terminal device can choose to access the lower-layer network and the upper-layer network that can support the IMS voice service, so that the terminal device can register to the upper-layer network supporting the IMS voice service, so as to ensure that the subsequent terminal device can initiate the IMS voice service on the upper-layer network, ensuring that The terminal equipment uses the QoS of the IMS voice service in the upper layer network.
  • FIG. 9 is a schematic flowchart of another method 500 for network selection provided by an embodiment of the present application.
  • the method 500 includes:
  • Step S510 the terminal device initiates a registration request at the mobility management network element #2 of the first lower layer network, refer to step S310.
  • step S520 the terminal device acquires the second indication information, and the flow of this step refers to step S350, which is not repeated here.
  • Step S530 the terminal device sends a registration request to the mobility management network element #1 of the first upper layer network.
  • the terminal device sends the registration request message to the N3IWF through the IPSec connection, and the N3IWF forwards the registration request message to the mobility management network element #1 of the first upper layer network through the N2 message.
  • the registration request message or the N2 message carries the second indication information.
  • the terminal device may also implicitly indicate through the registration request message that the first lower-layer network can support the PS session accessed through the NR cell to provide the IMS voice service.
  • the terminal device sends a registration message to the mobility management network element #1 of the first upper-layer network. ask.
  • Step S540 the mobility management network element #1 of the first upper layer network determines the first indication information according to the second indication information and the local configuration.
  • the first indication information indicates whether the first upper layer network can support providing IMS voice services through a PS session accessed through N3GPP.
  • S540 may refer to the description of S460.
  • Step S550 the mobility management network element #1 of the first upper layer network sends the first indication information to the terminal device.
  • the first indication information is carried in a registration response message.
  • the terminal device if the terminal device receives the first indication information indicating that the first upper layer network supports the provision of IMS voice services through a PS session accessed through N3GPP, the terminal device initiates an IMS voice service request on the first upper layer network.
  • the terminal device may re-select the network.
  • the terminal device selects the N3GPP interworking function network element of the second upper layer network, and accesses the second upper layer network through the first lower layer network and the N3GPP interworking function network element; or, the terminal device accesses the second upper layer network through the 3GPP access type.
  • the third network includes the first upper layer network.
  • the terminal device selects the N3GPP interworking function network element of the second upper layer network, and accesses the second upper layer network through the first lower layer network and the N3GPP interworking function network element. It should be noted that the terminal device may perform some steps of the method in this embodiment, for example, steps S530-S550 of method 500, to obtain an indication of whether the second upper layer network can support providing IMS voice services through a PS session accessed through N3GPP. Optionally, if the second upper-layer network can support providing IMS voice services through a PS session accessed through N3GPP, the terminal device initiates an IMS voice service request on the second upper-layer network after accessing the second upper-layer network through the first lower-layer network.
  • the terminal device can access the third network through the 3GPP access type, and the third network
  • the network includes the first upper layer network.
  • the terminal device can choose to access the lower-layer network and the upper-layer network that can support the IMS voice service, so that the terminal device can register to the upper-layer network supporting the IMS voice service, and it is ensured that the subsequent terminal device can initiate the IMS voice service on the upper-layer network.
  • the terminal equipment uses the QoS of the IMS voice service in the upper layer network.
  • FIG. 10 is a schematic flowchart of another method 600 for network selection provided by an embodiment of the present application.
  • the method 600 includes:
  • Step S610 the terminal device sends a registration request to the mobility management network element #1 of the first upper layer network.
  • the terminal device sends the registration request message to the N3IWF through the IPSec connection, and the N3IWF forwards the registration request message to the mobility management network element #1 of the first upper layer network through the N2 message.
  • the terminal device may carry an indication of registering through the first lower-layer network or an identifier of the first lower-layer network in the registration request message; or the N3IWF may carry an indication of registering through the first lower-layer network in the N2 message or The identity of the first lower layer network.
  • the N3IWF may determine the second indication information according to the locally configured SLA and carry the second indication information in the N2 message, where the second indication information indicates whether the first lower-layer network can pass the NR cell.
  • the accessed PS session provides IMS voice services.
  • Step S620 the mobility management network element #1 of the first upper layer network determines the first indication information.
  • the mobility management network element #1 of the first upper-layer network may acquire the second indication information according to the SLA, so as to determine the first indication information.
  • the SLA may be configured on the mobility management network element #1 of the first upper layer network.
  • the mobility management network element #1 of the first upper layer network may obtain the second indication information from the N2 message, so as to determine the first indication information.
  • the SLA may be configured on the N3IWF, and the N3IWF carries the second indication information in the N2 message and sends it to the mobility management network element #1 of the first upper layer network.
  • the mobility management network element #1 of the first upper layer network may learn the indication that the terminal device registers through the first lower layer network or the identifier of the first lower layer network from the registration request or the N2 message.
  • the mobility management network element #1 of the first upper layer network may query the second indication information from the SLA according to the instruction of the first lower layer network to register or the identifier of the first lower layer network.
  • Step S630 the mobility management network element #1 of the first upper layer network sends the first indication information to the terminal device.
  • the first indication information is carried in a registration response message.
  • the terminal device receives the first indication information indicating that the first upper layer network cannot support the PS session accessed through the N3GPP to provide the IMS voice service. Then the terminal device selects the N3GPP interworking function network element of the second upper layer network, and accesses the second upper layer network through the first lower layer network and the N3GPP interworking function network element; or, the terminal device accesses the second upper layer network through the 3GPP access type.
  • the third network includes the first upper layer network.
  • the terminal device selects the N3GPP interworking function network element of the second upper layer network, and accesses the second upper layer network through the first lower layer network and the N3GPP interworking function network element. Similar to the above, the terminal device may perform some steps of the method in this embodiment, for example, steps S610-S630 of method 600, to obtain an indication of whether the second upper layer network can support providing IMS voice services through a PS session accessed through N3GPP. Optionally, if the second upper-layer network can support providing IMS voice services through a PS session accessed through N3GPP, the terminal device initiates an IMS voice service request on the second upper-layer network after accessing the second upper-layer network through the first lower-layer network.
  • the terminal device can access the third network through the 3GPP access type, and the third network
  • the network includes the first upper layer network.
  • the terminal device can select the lower-layer network and the upper-layer network that can support the IMS voice service to access, so that the terminal device can register to the network supporting the IMS voice service, and ensure that the subsequent terminal device can initiate the IMS voice service in the selected network, Guarantee the service quality of terminal equipment using IMS voice service.
  • FIG. 11 is a schematic flowchart of another method 700 for network selection provided by an embodiment of the present application.
  • the method 700 includes:
  • Step S710 the terminal device sends a registration request to the mobility management network element #1 of the first upper layer network.
  • the terminal device sends the registration request message to the N3IWF through the IPSec connection, and the N3IWF forwards the registration request message to the mobility management network element #1 of the first upper layer network through the N2 message.
  • step S710 the terminal device is registered in the first lower-layer network, and the registration steps are the same as those of S510, which are not repeated here.
  • the mobility management network element #1 of the first upper layer network can learn the indication that the terminal device registers through the first lower layer network or the identifier of the first lower layer network in the registration request or the N2 message.
  • Step S720 the mobility management network element #1 of the first upper layer network queries the NEF #2 of the lower layer network whether the first lower layer network can support the PS session accessed through the NR cell to provide the IMS voice service.
  • the mobility management network element #1 of the first upper layer network sends a message to query whether the first lower layer network can support the PS session accessed through the NR cell to provide the IMS voice service to the NEF #2 of the lower layer network.
  • the message may carry the identifier of the terminal device.
  • Step S730 NEF#2 inquires from mobility management network element #2 whether the first lower layer network can support the PS session accessed through the NR cell to provide the IMS voice service.
  • the NEF#2 may learn that the mobility management network element providing the service for the terminal device is the mobility management network element #2.
  • NEF#2 queries the UDM for a mobility management network element that provides services for the terminal device.
  • NEF#2 sends a query message to the UDM, where the query message carries the identifier of the terminal device.
  • the mobility management network element that NEF#2 receives feedback from the UDM is, for example, mobility management network element #2.
  • the NEF #2 queries the mobility management network element #2 through the PCF whether the first lower layer network can support the PS session accessed through the NR cell to provide the IMS voice service.
  • NEF#2 can determine the second indication information according to the local configuration, and at this time, it is not necessary to query mobility management network element #2 whether the first lower-layer network can support passing through.
  • the PS session accessed by the NR cell provides IMS voice services.
  • Step S740 the mobility management network element #2 of the first lower-layer network determines the second indication information.
  • step S740 reference may be made to the description of step S357 in FIG. 7 , which is not repeated here.
  • Step S750 the mobility management network element #2 of the first lower-layer network sends the second indication information to the NEF #2.
  • the mobility management network element #2 of the first lower layer network sends a response message to the NEF #2 to query whether the first lower layer network can support the IMS voice service provided by the PS session accessed through the NR cell, the The response message carries the second indication information.
  • the mobility management network element #2 of the first lower layer network may send the second indication information to the NEF #2 through the PCF.
  • Step S760 NEF#2 sends second indication information to mobility management network element #1 of the first upper layer network.
  • the response message is sent to the mobility management network element #1 of the first upper layer network, and the response message carries the second indication information.
  • Step S770 the mobility management network element #1 of the first upper layer network determines the first indication information according to the second indication information and the local configuration. Step S770 may refer to the description of S460.
  • Step S780 the mobility management network element #1 of the first upper layer network sends the first indication information to the terminal device.
  • the first indication information is carried in a registration response message.
  • the mobility management network element #1 of the first upper layer network sends an N2 message to the N3IWF, the N2 message includes a registration response message, and the N3IWF sends an IPSec message to the terminal device to forward the registration response message.
  • the terminal device receives the first indication information indicating that the first upper layer network cannot support the PS session accessed through the N3GPP to provide the IMS voice service. Then the terminal device selects the N3GPP interworking function network element of the second upper layer network, and accesses the second upper layer network through the first lower layer network and the N3GPP interworking function network element; or, the terminal device accesses the second upper layer network through the 3GPP access type.
  • the third network includes the first upper layer network.
  • the terminal device selects the N3GPP interworking function network element of the second upper layer network, and accesses the second upper layer network through the first lower layer network and the N3GPP interworking function network element.
  • the terminal device may perform some steps of the method in this embodiment, for example, steps S710-S780 of method 700, to obtain an indication of whether the second upper layer network can support the provision of IMS voice services through a PS session accessed through N3GPP.
  • the terminal device initiates an IMS voice service request on the second upper-layer network after accessing the second upper-layer network through the first lower-layer network.
  • the terminal device can access the third network through the 3GPP access type, and the third network
  • the network includes the first upper layer network.
  • the terminal device can choose to access the lower-layer network and the upper-layer network that can support the IMS voice service, so that the terminal device can register to the upper-layer network supporting the IMS voice service, so as to ensure that the subsequent terminal device can initiate the IMS voice service on the upper-layer network, ensuring that The terminal equipment uses the QoS of the IMS voice service in the upper layer network.
  • FIG. 12 is a schematic flowchart of another method 800 for network selection provided by an embodiment of the present application.
  • the method 800 includes:
  • Step S810 the terminal device is registered in the first lower-layer network.
  • S810 reference may be made to the description of S510, which is not repeated here.
  • Step S820 the SMF#2 of the first lower layer network learns according to the local configuration that the terminal device is accessing the first upper layer network using a specific DNN/S-NSSAI PDU session, thereby determining the NEF#1 of the first upper layer network.
  • Step S830 the SMF #2 of the first lower layer network sends a message to the mobility management network element #2 of the first lower layer network to query whether the first lower layer network can support the PS session accessed through the NR cell to provide the IMS voice service .
  • the message may carry the identifier of the terminal device.
  • Step S840 is the same as step S357 in FIG. 7 , the mobility management network element #2 of the first lower layer network determines the second indication information. and send the second indication information to SMF#2 of the first lower layer network.
  • Step S850 the SMF#2 of the first lower-layer network sends the second indication information to the NEF#1 of the first upper-layer network.
  • the mobility management network element #2 of the first lower-layer network directly sends the second indication information to the NEF#1 of the first upper-layer network.
  • the identifier of the carrying terminal device may also be sent to the NEF#1 of the first upper layer network.
  • Step S860 the terminal device sends a registration request to the mobility management network element #1 of the first upper layer network.
  • the terminal device sends the registration request message to the N3IWF through the IPSec connection, and the N3IWF forwards the registration request message to the mobility management network element #1 of the first upper layer network through the N2 message.
  • the terminal device may carry the identifier of the first lower-layer network in the registration request message; or the N3IWF may carry the identifier of the first lower-layer network in the N2 message.
  • the mobility management network element #1 of the first upper layer network determines the identity of the first lower layer network through the dedicated N3IWF
  • Step S870 the mobility management network element #1 of the first upper layer network queries the NEF #1 of the first upper layer network whether the first lower layer network can support the PS session accessed through the NR cell to provide the IMS voice service.
  • the mobility management network element #1 of the first upper layer network sends a query message to the NEF #1 of the first upper layer network to query whether the first lower layer network can support the PS session accessed through the NR cell to provide the IMS voice service .
  • the query message carries the identifier of the first lower-layer network.
  • the query message can be forwarded to NEF#1 through the PCF of the first upper-layer network.
  • the query message also carries the identifier of the terminal device.
  • Step S880 the NEF #1 of the first upper layer network sends a response message of the query message to the mobility management network element #1, where the response message carries the second indication information.
  • the NEF#1 of the first upper layer network may directly transfer the No.
  • the second indication information is sent to the mobility management network element #1.
  • Step S890 the mobility management network element #1 of the first upper layer network determines the first indication information according to the second indication information and the local configuration.
  • the first indication information indicates whether the first upper layer network can support providing IMS voice services through a PS session accessed through N3GPP.
  • the mobility management network element #1 of the first upper layer network sends the first indication information to the terminal device.
  • the first indication information is carried in the registration response message.
  • the second indication information indicates that the first lower-layer network can support the PS session accessed through the NR cell to provide the IMS voice service, if the mobility management network element #1 of the first upper-layer network is configured according to the local configuration It is determined that the first upper layer network does not support the IMS voice service, and the first indication information indicates that the first upper layer network cannot support the PS session accessed through N3GPP to provide the IMS voice service; if the mobility management network element #1 of the first upper layer network according to If the local configuration determines that the first upper layer network supports the IMS voice service, the first indication information indicates that the first upper layer network can support the PS session accessed through the N3GPP to provide the IMS voice service.
  • the second indication information indicates that the first lower-layer network cannot support the PS session accessed through the NR cell to provide IMS voice services.
  • the first indication information indicates that the first upper-layer network cannot support the provision of the IMS voice service through the PS session accessed through N3GPP.
  • the first indication information indicates that the first upper-layer network cannot support the PS session accessed through N3GPP to provide the IMS voice service.
  • the first lower-layer network supports the IMS voice service, but the first The upper-layer network does not support the IMS voice service.
  • the first lower-layer network does not support the IMS voice service, but the first upper-layer network supports the IMS voice service.
  • the terminal device needs to select the N3GPP interworking function network element of other upper-layer network capable of supporting the IMS voice service, and access the upper-layer network through the first lower-layer network and the N3GPP interworking function network element of the upper-layer network.
  • the terminal device selects the N3GPP interworking function network element of the second upper layer network, and accesses the second upper layer network through the first lower layer network and the N3GPP interworking function network element. It should be noted that the terminal device may perform some steps of the method in this embodiment, for example, steps S860-S890 of method 800, to obtain an indication of whether the second upper layer network can support providing IMS voice services through a PS session accessed through N3GPP. Optionally, if the second upper-layer network can support providing IMS voice services through a PS session accessed through N3GPP, the terminal device initiates an IMS voice service request on the second upper-layer network after accessing the second upper-layer network through the first lower-layer network.
  • the terminal device needs to select the second lower layer network that can provide the IMS voice service through the PS session accessed by the NR cell.
  • the terminal device can obtain an indication of whether the second lower layer network can provide the IMS voice service through the PS session accessed by the NR cell.
  • steps S810-S890 may be performed again, wherein the first lower layer network is replaced with the second lower layer network.
  • the terminal device obtains the first indication information.
  • the terminal device may also access a third network through a 3GPP access type, where the third network includes the first upper-layer network.
  • the terminal device initiates an IMS voice service request in the third network.
  • the terminal device can select the lower layer network and/or the upper layer network that can support the IMS voice service to access, so that the terminal device can register to the network supporting the IMS voice service, and ensure that the subsequent terminal device can initiate the IMS voice service on the network, Guarantee the service quality of terminal equipment using IMS voice service.
  • FIG. 13 is a schematic flowchart of another method 900 for network selection provided by an embodiment of the present application.
  • the method 900 includes:
  • Steps S910-S940 are the same as steps S810-S840, and will not be repeated here.
  • Step S950 the SMF#2 of the first lower layer network instructs the access network equipment to start to send the general packet radio service tunneling protocol user plane (general packet radio service tunneling protocol user plane, GTP of one or more data packets to the terminal equipment) -U)
  • the second indication information is added to the packet header, or the SMF#2 of the first lower-layer network indicates that the UPF#2 of the first lower-layer network is in the IPSec header of one or more data packets sent to the terminal device Add the second indication information in .
  • Step S960 Send a registration request to the mobility management network element #1 of the first upper layer network.
  • the terminal device sends the registration request message to the N3IWF through the IPSec connection, and the N3IWF forwards the registration request message to the mobility management network element #1 of the first upper layer network through the N2 message.
  • the N2 message carries the second indication information.
  • the N3IWF learns the second indication information according to the IPSec header and carries the second indication information in the N2 message.
  • Step S970 the mobility management network element #1 of the first upper layer network determines the first indication information according to the second indication information and the local configuration.
  • the mobility management network element #1 of the first upper layer network sends the first indication information to the terminal device.
  • the first indication information is carried in the registration response message.
  • the second indication information indicates that the first lower-layer network can support the PS session accessed through the NR cell to provide the IMS voice service, if the mobility management network element #1 of the first upper-layer network is configured according to the local configuration It is determined that the first upper layer network does not support the IMS voice service, and the first indication information indicates that the first upper layer network cannot support the PS session accessed through N3GPP to provide the IMS voice service; if the mobility management network element #1 of the first upper layer network according to If the local configuration determines that the first upper layer network supports the IMS voice service, the first indication information indicates that the first upper layer network can support the PS session accessed through the N3GPP to provide the IMS voice service.
  • the second indication information indicates that the first lower-layer network cannot support the PS session accessed through the NR cell to provide IMS voice services.
  • the first indication information indicates that the first upper-layer network cannot support the provision of the IMS voice service through the PS session accessed through N3GPP.
  • the first indication information indicates that the first upper-layer network cannot support the PS session accessed through N3GPP to provide the IMS voice service.
  • the first lower-layer network supports the IMS voice service, but the first The upper-layer network does not support the IMS voice service.
  • the first lower-layer network does not support the IMS voice service, but the first upper-layer network supports the IMS voice service.
  • the terminal device needs to select the N3GPP interworking function network element of other upper-layer network capable of supporting the IMS voice service, and access the upper-layer network through the first lower-layer network and the N3GPP interworking function network element of the upper-layer network.
  • the terminal device selects the N3GPP interworking function network element of the second upper layer network, and accesses the second upper layer network through the first lower layer network and the N3GPP interworking function network element. It should be noted that the terminal device may perform some steps of the method in this embodiment, for example, steps S960-S970 of method 900, to obtain an indication of whether the second upper layer network can support providing IMS voice services through a PS session accessed through N3GPP. Optionally, if the second upper layer network can support providing IMS voice services through the PS session accessed through N3GPP, after the terminal device accesses the second upper layer network through the first lower layer network, it initiates an IMS voice service request on the second upper layer network.
  • the terminal device needs to select the second lower layer network that can provide the IMS voice service through the PS session accessed by the NR cell.
  • the terminal device can obtain an indication of whether the second lower layer network can provide the IMS voice service through the PS session accessed by the NR cell.
  • steps S910-S970 may be performed again, wherein the first lower layer network is replaced with the second lower layer network.
  • the terminal device obtains the first indication information.
  • the terminal device may also access a third network through a 3GPP access type, where the third network includes the first upper-layer network.
  • the terminal device initiates an IMS voice service request in the third network.
  • the terminal device can choose to access the lower-layer network and the upper-layer network that can support the IMS voice service, so that the terminal device can register to the network supporting the IMS voice service, so as to ensure that the subsequent terminal device can initiate the IMS voice service on the network, and the terminal device can be guaranteed The quality of service of the device using the IMS voice service.
  • execution bodies shown in FIG. 2 to FIG. 13 are only examples, and the execution bodies may also be chips, chip systems, or processors that support the execution bodies to implement the methods 200 to 900 , which are not described in this application. limit.
  • the methods and operations implemented by the access network equipment may also be implemented by components (such as chips or circuits) that can be used in the access network equipment, and implemented by core network elements or terminals.
  • the methods and operations can also be implemented by components (such as chips or circuits) that can be used for core network elements or terminals.
  • each network element such as a transmitter device or a receiver device
  • each network element includes hardware structures and/or software modules corresponding to performing each function in order to implement the above functions.
  • Those skilled in the art should realize that the present application can be implemented in hardware or a combination of hardware and computer software with the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein. Whether a function is performed by hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this application.
  • the transmitting-end device or the receiving-end device may be divided into functional modules according to the foregoing method examples.
  • each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. middle.
  • the above-mentioned integrated modules can be implemented in the form of hardware, and can also be implemented in the form of software function modules. It should be noted that, the division of modules in the embodiments of the present application is schematic, and is only a logical function division, and there may be other division manners in actual implementation. The following description will be given by taking as an example that each function module is divided corresponding to each function.
  • FIG. 14 is a schematic block diagram of a communication apparatus provided by an embodiment of the present application.
  • the communication device 1400 includes a transceiver unit 1410 and a processing unit 1420 .
  • the transceiver unit 1410 can communicate with the outside, and the processing unit 1420 is used for data processing.
  • Transceiver unit 1410 may also be referred to as a communication interface or a communication unit.
  • the communication device 1400 may further include a storage unit, which may be used to store instructions or and/or data, and the processing unit 1420 may read the instructions or and/or data in the storage unit.
  • a storage unit which may be used to store instructions or and/or data
  • the processing unit 1420 may read the instructions or and/or data in the storage unit.
  • the communication device 1400 may be the mobility management network element #1 of the first upper layer network, wherein the transceiver unit 1410 is configured to perform the receiving or sending of the mobility management network element #1 in the above method embodiments. Operation, the processing unit 1420 is configured to perform the operation of the internal processing of the mobility management network element #1 in the above method embodiment.
  • the processing unit 1420 is configured to obtain second indication information, where the second indication information indicates whether the first lower-layer network can provide the Internet Protocol Multimedia Network Subsystem IMS through the packet-switched PS session accessed by the new air interface NR cell voice service; the processing unit is further configured to determine first indication information according to the second indication information, where the first indication information indicates whether the first upper layer network can support the provision of PS sessions accessed through non-3rd Generation Partnership Project N3GPP IMS voice service;
  • the transceiver unit 1410 is configured to send the first indication information to the terminal device.
  • the transceiver unit 1410 is further configured to receive a registration request message from the terminal device or an N2 message from an N3GPP interworking function network element, where the registration request message or the N2 message includes the second indication information.
  • the processing unit 1420 is specifically configured to acquire the second indication information according to the local configuration.
  • the local configuration further includes an identifier of the first lower-layer network.
  • the transceiver unit 1410 is further configured to receive a registration request message from the terminal device or an N2 message from the N3GPP interworking function network element, where the registration request message or the N2 message includes third indication information, and the third indication information Indicates whether the terminal device accesses the first upper layer network through the protocol data unit PDU session of the first lower layer network, or the third indication information indicates the network identifier of the first lower layer network.
  • the mobility management network element #1 of the first upper layer network may determine the second indication information according to the locally configured SLA and the third indication information.
  • an SLA is configured in the N3GPP interworking function network element, and the N3GPP interworking function network element receives an IPSec message from the terminal device, and the IPSec message includes third indication information, and the third indication information indicates whether the terminal device passes the first IPSec message.
  • the protocol data unit PDU session of the lower-layer network accesses the first upper-layer network, or the third indication information indicates the network identifier of the first lower-layer network, or the N3GPP interworking function network element is a dedicated N3GPP interworking function network element , and determine the third indication information according to the local configuration.
  • the second indication information is determined, and then the second indication information is sent to the transceiver unit 1410 through an N2 message.
  • the communication device 1400 may be the mobility management network element #2 of the first lower layer network
  • the transceiver unit 1410 is configured to execute the mobility management network element of the first lower layer network in the above method embodiments
  • the processing unit 1420 is configured to perform the operation of the internal processing of the mobility management network element #2 of the first lower-layer network in the above method embodiment.
  • the processing unit 1420 is configured to determine second indication information, where the second indication information indicates whether the first underlying network can provide the Internet Protocol Multimedia Network Subsystem through the packet-switched PS session accessed by the new air interface NR cell IMS voice service.
  • the transceiver unit 1410 is configured to send the second indication information to the terminal device.
  • the processing unit 1420 is specifically configured to determine the second indication information according to the local configuration and the capability of the terminal device.
  • the processing unit 1420 may further determine the second indication information according to the data network name DNN of the session of the terminal device, and the single network slice selection auxiliary information S-NSSAI.
  • the transceiver unit 1410 is further configured to receive a first message from an access network device of the first lower layer network, where the first message includes the capability of the terminal device.
  • the transceiver unit 1410 is further configured to send a second message to the access network device of the first lower layer network, where the second message is used to query whether the first lower layer network can access the PS through the NR cell
  • the second message further includes the capability of the terminal device.
  • the second indication information from the access network device may be carried in the first message.
  • the communication apparatus 1400 may be an access network device of the first lower layer network, or may also be a chip or circuit configured in the access network device of the first lower layer network. Not limited.
  • the transceiver unit 1410 is configured to perform the operation of receiving or sending the access network device of the first lower layer network in the above method embodiment, and the processing unit 1420 is configured to perform the operation of internal processing of the access network device in the above method embodiment.
  • the processing unit 1420 is configured to determine the second indication information according to the local configuration and the capability of the terminal device, where the second indication information indicates whether the first lower layer network can access the packet-switched PS through the new air interface NR cell
  • the session provides Internet Protocol Multimedia Network Subsystem IMS voice services.
  • the transceiver unit 1410 is configured to send the second indication information to the mobility management network element of the first lower layer network.
  • the transceiver unit 1410 is further configured to accept a second message from the mobility management network element of the first lower layer network, where the second message is used to query whether the first lower layer network can be accessed through the NR cell
  • the PS session provides IMS voice services.
  • the transceiver unit 1410 is further configured to send a first message to the mobility management network element of the first lower layer network, where the first message includes the capability of the terminal device.
  • the transceiver unit 1410 is further configured to send capability request information to the terminal device, where the capability request information is used to request the capability of the terminal device; the transceiver unit 1410 is further configured to receive a third message from the terminal device, The third message includes the capabilities of the terminal device.
  • the second message further includes the capability of the terminal device.
  • the communication apparatus 1400 may be a component configured in an access network device, for example, a chip in the access network device.
  • the transceiver unit 1410 may be an interface circuit, a pin or the like.
  • the interface circuit may include an input circuit and an output circuit
  • the processing unit 1420 may include a processing circuit.
  • the transceiver unit 1410 may also be a radio frequency module.
  • the processing unit 1420 may be a baseband module.
  • the radio frequency module is mainly used for transmitting and receiving radio frequency signals and the conversion of radio frequency signals and baseband signals; the baseband module is mainly used for baseband processing and so on.
  • FIG. 15 is a schematic block diagram of another communication apparatus provided by an embodiment of the present application.
  • the communication device 1500 includes a transceiver unit 1510 and a processing unit 1520 .
  • the transceiver unit 1510 can communicate with the outside, and the processing unit 1520 is used for data processing.
  • Transceiver unit 1510 may also be referred to as a communication interface or a communication unit.
  • the communication apparatus 1500 may further include a storage unit, which may be used to store instructions or/or data, and the processing unit 1520 may read the instructions or/or data in the storage unit.
  • a storage unit which may be used to store instructions or/or data
  • the processing unit 1520 may read the instructions or/or data in the storage unit.
  • the communication apparatus 1500 may be a terminal device, and the transceiver unit 1510 is configured to perform the operation of receiving or sending the terminal device in the above method embodiments.
  • the transceiver unit 1510 is configured to receive second indication information from the mobility management network element of the first lower layer network, where the second indication information indicates that the first lower layer network can provide a packet-switched PS session accessed by the new air interface NR cell.
  • Internet Protocol Multimedia Network Subsystem IMS Voice Service is configured to receive second indication information from the mobility management network element of the first lower layer network, where the second indication information indicates that the first lower layer network can provide a packet-switched PS session accessed by the new air interface NR cell.
  • the processing unit 1520 is configured to select, according to the second indication information, a non-third-generation partnership project of the first upper layer network to access the N3GPP interworking function network element, and to access the first lower layer network and the N3GPP interworking function network element. an upper-layer network.
  • the transceiver unit 1510 is further configured to receive first indication information from the mobility management network element of the first upper layer network, where the first indication information indicates whether the first upper layer network can support providing IMS voice services through the N3GPP PS session.
  • the transceiver unit 1510 is further configured to receive fourth indication information from the mobility management network element of the second lower layer network, where the fourth indication information indicates that the second lower layer network cannot be provided by the PS session accessed by the NR cell. IMS voice service; the processing unit 1520 is further configured to select the first lower layer network.
  • the transceiver unit 1510 is further configured to send second indication information to the mobility management network element of the first upper layer network, where the second indication information is used by the mobility management network element of the first upper layer network to determine the first an instruction message.
  • the first indication information indicates that the first upper layer network cannot support the PS session accessed through N3GPP to provide the IMS voice service
  • the processing unit 1520 is configured to select the N3GPP interworking function network element of the second upper layer network, and pass the N3GPP interworking function network element.
  • the first lower-layer network and the N3GPP interworking function network element access the second upper-layer network; or, the processing unit 1520 is configured to access a third network through a 3GPP access type, where the third network includes the first upper-layer network.
  • the transceiver unit 1510 is specifically configured to send a registration request message to the mobility management network element of the first upper layer network or send an Internet security protocol message to the N3GPP interworking function network element of the first upper layer network, the registration request message.
  • the Internet security protocol message includes the second indication information.
  • the transceiver unit 1510 is specifically configured to send a registration request message to the mobility management network element of the first upper layer network or send an Internet security protocol message to the N3GPP interworking function network element of the first upper layer network, the registration request message.
  • the Internet security protocol message includes third indication information, the third indication information indicates whether the terminal device accesses the first upper layer network through the protocol data unit PDU session of the first lower layer network, or the third indication information indicates the The network identifier of the first lower layer network.
  • the apparatus further includes a storage unit configured to store the first indication information; the 1520 processing unit is further configured to select an N3GPP interworking function network element of the first upper layer network according to the first indication information.
  • the processing unit 1520 is configured to determine, according to the first indication information, that the first upper layer network cannot support the PS session accessed through N3GPP to provide IMS voice services; the processing unit 1520 does not select the N3GPP interworking function of the first upper layer network network element.
  • the transceiver unit 1510 is further configured to receive capability request information from the access network device of the lower layer network, where the capability request information is used to request the capability of the terminal device;
  • the access network device sends a third message, where the third message includes the capabilities of the terminal device.
  • the communication apparatus 1500 may also be a component configured in a terminal device, for example, a chip in the terminal device.
  • the transceiver unit 1510 may be an interface circuit, a pin or the like.
  • the interface circuit may include an input circuit and an output circuit
  • the processing unit 1520 may include a processing circuit.
  • the transceiver unit 1510 may also be a radio frequency module.
  • the processing unit 1520 may be a baseband module.
  • the radio frequency module is mainly used for transmitting and receiving radio frequency signals and the conversion of radio frequency signals and baseband signals; the baseband module is mainly used for baseband processing and so on.
  • an embodiment of the present application further provides a communication apparatus 1600 .
  • the communication device 1600 includes a processor 1610 coupled to a memory 1620 for storing computer programs or instructions or/or data, and the processor 1610 for executing the computer programs or instructions and/or data stored in the memory 1620 , so that the methods in the above method embodiments are executed.
  • the communication apparatus 1600 includes one or more processors 1610 .
  • the communication apparatus 1600 may further include a memory 1620 .
  • the communication device 1600 may include one or more memories 1620 .
  • the memory 1620 may be integrated with the processor 1610, or provided separately.
  • the communication apparatus 1600 may further include a transceiver 1630, and the transceiver 1630 is used for signal reception and/or transmission.
  • the processor 1610 is used to control the transceiver 1630 to receive and/or transmit signals.
  • the communication apparatus 1600 is configured to implement the operations performed by the mobility management network element #1, the mobility management network element #2, or the access network device in the above method embodiments.
  • the processor 1610 is used to implement the processing operations performed by the mobility management network element #1, the mobility management network element #2, or the access network device in the above method embodiments, and the transceiver 1630 is used to implement the above method
  • the receiving or sending operation is performed by the mobility management network element #1, the mobility management network element #2, or the access network equipment.
  • the processing unit 1420 in the apparatus 1400 may be the processor in FIG. 16
  • the transceiver unit 1410 may be the transceiver in FIG. 16 .
  • the operations performed by the processor 1610 may refer to the description of the processing unit 1420 above, and the operations performed by the transceiver 1630 may be referred to the description of the transceiver unit 1410, which will not be repeated here.
  • an embodiment of the present application further provides a communication apparatus 1700 .
  • the communication device 1700 includes a processor 1710 coupled to a memory 1720 for storing computer programs or instructions or/or data, and the processor 1710 for executing the computer programs or instructions and/or data stored in the memory 1720 , so that the methods in the above method embodiments are executed.
  • the communication apparatus 1700 includes one or more processors 1710 .
  • the communication apparatus 1700 may further include a memory 1720 .
  • the communication device 1700 may include one or more memories 1720 .
  • the memory 1720 may be integrated with the processor 1710, or provided separately.
  • the communication apparatus 1700 may further include a transceiver 1730, and the transceiver 1730 is used for signal reception and/or transmission.
  • the processor 1710 is used to control the transceiver 1730 to receive and/or transmit signals.
  • the communication apparatus 1700 is configured to implement the operations performed by the terminal device in the above method embodiments.
  • the processor 1710 is configured to implement the operations performed internally by the terminal device in the above method embodiments
  • the transceiver 1730 is configured to implement the receive or send operations performed by the terminal device in the above method embodiments.
  • the processing unit 1520 in the apparatus 1500 may be the processor in FIG. 17
  • the transceiver unit 1510 may be the transceiver in FIG. 17 .
  • the operations performed by the processor 1710 may refer to the description of the processing unit 1520 above
  • the operations performed by the transceiver 1730 may be referred to the description of the transceiver unit 1510, which will not be repeated here.
  • Embodiments of the present application further provide a computer-readable storage medium, on which is stored a method for implementing the method performed by the mobility management network element #1 or the method performed by the mobility management network element #2 in the foregoing method embodiments, Or computer instructions for a method performed by an access network device or terminal device.
  • the computer when the computer program is executed by a computer, the computer can implement the method executed by the core network element in the above method embodiments, or the method executed by the access network device or the terminal device.
  • the embodiments of the present application further provide a computer program product including instructions, when the instructions are executed by a computer, the instructions cause the computer to implement the method executed by the mobility management network element #1 in the above method embodiments, or the mobility management network element #1 2.
  • An embodiment of the present application further provides a communication system, where the communication system includes the mobility management network element #2 in the above embodiment and an access network device.
  • the communication system further includes a mobility management network element #1 or a terminal device.
  • the core network element and the access network device or terminal device may include a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer.
  • the hardware layer may include hardware such as a central processing unit (CPU), a memory management unit (MMU), and memory (also called main memory).
  • the operating system of the operating system layer may be any one or more computer operating systems that implement business processing through processes, such as a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a Windows operating system.
  • the application layer may include applications such as browsers, address books, word processing software, and instant messaging software.
  • the embodiments of the present application do not specifically limit the specific structure of the execution body of the methods provided by the embodiments of the present application, as long as the program in which the codes of the methods provided by the embodiments of the present application are recorded can be executed to execute the methods according to the embodiments of the present application.
  • the execution subject of the method provided by the embodiment of the present application may be a core network element and an access network device or a terminal device, or, a core network element and an access network device or a terminal device that can call a program and execute the program functional module.
  • Computer readable media may include, but are not limited to, magnetic storage devices (eg, hard disks, floppy disks, or magnetic tapes, etc.), optical disks (eg, compact discs (CDs), digital versatile discs (DVDs), etc. ), smart cards and flash memory devices (eg, erasable programmable read-only memory (EPROM), cards, stick or key drives, etc.).
  • magnetic storage devices eg, hard disks, floppy disks, or magnetic tapes, etc.
  • optical disks eg, compact discs (CDs), digital versatile discs (DVDs), etc.
  • smart cards and flash memory devices eg, erasable programmable read-only memory (EPROM), cards, stick or key drives, etc.
  • Various storage media described herein may represent one or more devices and/or other machine-readable media for storing information.
  • the term "machine-readable medium” may include, but is not limited to, wireless channels and various other media capable of storing, containing, and/or carrying instructions and/or data.
  • processors mentioned in the embodiments of the present application may be a central processing unit (central processing unit, CPU), and may also be other general-purpose processors, digital signal processors (digital signal processors, DSP), application-specific integrated circuits ( application specific integrated circuit, ASIC), off-the-shelf programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.
  • a general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
  • the memory mentioned 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 (PROM), erasable programmable read-only memory (EPROM), electrically programmable Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory.
  • Volatile memory may be random access memory (RAM).
  • RAM can be used as an external cache.
  • RAM may include the following forms: static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (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 link dynamic random access memory (synchlink DRAM, SLDRAM) and Direct memory bus random access memory (direct rambus RAM, DR RAM).
  • SRAM static random access memory
  • DRAM dynamic random access memory
  • SDRAM synchronous dynamic random access memory
  • SDRAM double data rate synchronous dynamic random access memory
  • ESDRAM enhanced synchronous dynamic random access memory
  • SLDRAM synchronous link dynamic random access memory
  • Direct memory bus random access memory direct rambus RAM, DR RAM
  • the processor is a general-purpose processor, DSP, ASIC, FPGA or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components
  • the memory storage module
  • memory described herein is intended to include, but not be limited to, these and any other suitable types of memory.
  • the disclosed apparatus and method may be implemented in other manners.
  • the apparatus embodiments described above are only illustrative.
  • the division of the units is only a logical function division. In actual implementation, there may be other division methods.
  • multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented.
  • the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, which may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.
  • the computer may be implemented in whole or in part by software, hardware, firmware or any combination thereof.
  • software it can be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general purpose computer, special purpose computer, computer network, or other programmable device.
  • the computer may be a personal computer, a server, or a network device or the like.
  • the computer instructions may be stored in or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be downloaded from a website site, computer, server or data center Transmission to another website site, computer, server, or data center by wire (eg, coaxial cable, optical fiber, digital subscriber line) or wireless (eg, 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, data center, etc. that includes an integration of one or more available media.
  • the usable media may be magnetic media (eg, floppy disks, hard disks, magnetic tapes), optical media, or semiconductor media (eg, solid state disks (SSDs)), etc.
  • the foregoing usable media may include but not It is limited to: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or CD and other media that can store program codes.

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  • Engineering & Computer Science (AREA)
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  • Computer Networks & Wireless Communication (AREA)
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  • Mobile Radio Communication Systems (AREA)

Abstract

La présente demande concerne un procédé de sélection de réseau. Le procédé peut comprendre les étapes suivantes : un élément de réseau de gestion de mobilité d'un premier réseau de couche supérieure acquiert des secondes informations d'indication, les secondes informations d'indication indiquant si un premier réseau de couche inférieure peut fournir un service vocal de sous-système multimédia de protocole Internet (IMS) au moyen d'une session à commutation de paquets (PS) à laquelle accède une cellule de nouvelle radio (NR) ; déterminer des premières informations d'indication selon les secondes informations d'indication, les premières informations d'indication indiquant si le premier réseau de couche supérieure peut prendre en charge la fourniture du service vocal IMS au moyen d'une session PS à laquelle accède un projet de partenariat non de troisième génération (N3GPP) ; et envoyer les premières informations d'indication à un dispositif terminal. Au moyen de la solution de la présente demande, un dispositif terminal peut sélectionner, en fonction d'informations d'indication, un réseau de couche inférieure en mesure de fournir un service vocal IMS et accéder à celui-ci, ce qui permet d'assurer la qualité de service lorsque le dispositif terminal utilise le service vocal IMS dans un réseau de couche supérieure.
PCT/CN2021/085392 2021-04-02 2021-04-02 Procédé et appareil de sélection de réseau WO2022205453A1 (fr)

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PCT/CN2021/085392 WO2022205453A1 (fr) 2021-04-02 2021-04-02 Procédé et appareil de sélection de réseau

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CN110583047A (zh) * 2018-04-09 2019-12-17 联发科技股份有限公司 语音域选择的方法及其装置
CN111567068A (zh) * 2018-08-09 2020-08-21 联发科技股份有限公司 互联网协议多媒体子系统基于分组交换的语音指示处理

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CN110583047A (zh) * 2018-04-09 2019-12-17 联发科技股份有限公司 语音域选择的方法及其装置
CN111567068A (zh) * 2018-08-09 2020-08-21 联发科技股份有限公司 互联网协议多媒体子系统基于分组交换的语音指示处理

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