WO2019085970A1 - 通信方法、网元、终端装置和*** - Google Patents

通信方法、网元、终端装置和*** Download PDF

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Publication number
WO2019085970A1
WO2019085970A1 PCT/CN2018/113435 CN2018113435W WO2019085970A1 WO 2019085970 A1 WO2019085970 A1 WO 2019085970A1 CN 2018113435 W CN2018113435 W CN 2018113435W WO 2019085970 A1 WO2019085970 A1 WO 2019085970A1
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WIPO (PCT)
Prior art keywords
information
network element
session
network
terminal device
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PCT/CN2018/113435
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English (en)
French (fr)
Inventor
吴义壮
熊春山
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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 EP18874016.1A priority Critical patent/EP3700256B1/en
Priority to BR112020008694-0A priority patent/BR112020008694A2/pt
Priority to EP23192875.5A priority patent/EP4325938A3/en
Publication of WO2019085970A1 publication Critical patent/WO2019085970A1/zh
Priority to US16/864,385 priority patent/US11558783B2/en
Priority to US18/151,783 priority patent/US11997543B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/24—Negotiating SLA [Service Level Agreement]; Negotiating QoS [Quality of Service]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0268—Traffic management, e.g. flow control or congestion control using specific QoS parameters for wireless networks, e.g. QoS class identifier [QCI] or guaranteed bit rate [GBR]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
    • H04W36/0044—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information of quality context information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/11—Allocation or use of connection identifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/02—Inter-networking arrangements

Definitions

  • the present application relates to the field of communications and, more particularly, to communication methods, network elements, terminal devices and systems.
  • the interworking network architecture may include a 5G system and an Evolved Packet System (EPS), and a communication interface exists between the 5G system and the EPS system for interoperation between the communication systems.
  • EPS Evolved Packet System
  • the network can establish a context in multiple communication systems for the terminal at the same time, for example, establishing a context in the 5G system and establishing a context in the EPS system.
  • the context that may be established in a certain communication system is not used, so establishing a context for multiple communication systems will reduce the utilization of communication resources and increase system overhead.
  • the present application provides a communication method, a network element, a terminal device, and a system, which can improve communication efficiency.
  • a communication method including: receiving, by a first network element, first indication information from a second network element, where the first indication information is used to indicate that a current condition supports establishing a session of the first network for the terminal device; After receiving the first indication information, the first network element acquires first quality of service QoS control information of the first session of the terminal device, where the first session is that the terminal device passes the second network Establishing a session; the first network element sending the first QoS control information to the second network element.
  • the first session may be established while establishing the second network session of the first session, if the condition indicated by the first indication information is met.
  • the session of the first network can determine the session of the first network establishing the first session according to the current condition, avoiding establishing an unnecessary session of the first network, and improving communication efficiency.
  • the first indication information includes first information, where the first information is used to indicate that the current condition is a mobility management entity of the second network and the first network. There is a communication interface between the mobility management entities.
  • the first network element determines, according to the first information included in the first indication information, the first quality of service QoS control information of the first session of the terminal device of the first network, so as to be determined according to the first indication information. Establishing a session of the first network avoids establishing an unnecessary first network session and improves communication efficiency.
  • the first information includes a default bearer identifier of the first network of the terminal device.
  • the content of the first information is implicitly indicated by carrying the default bearer identifier of the first network of the terminal device in the first information, thereby saving overhead.
  • the first indication information further includes second information, where the second information is used to indicate that the current condition is that the terminal device is in a single registration state.
  • the first indication information includes the first information and the second information, and may establish the first time while establishing the second network session of the first session, if the condition indicated by the first indication information is met.
  • the session of the first network of the session avoids establishing an unnecessary session of the first network and improves communication efficiency.
  • the method further includes: the first network element acquiring third information, where the third information is used to indicate that the attribute of the first session is to ensure continuity; After the first indication information, the first network element acquires the first QoS control information of the terminal device, including: after acquiring the first indication information and the third information, the first network element acquiring The first QoS control information is described.
  • the first network of the first session may be established while establishing the second network session of the first session, if the network requirement indicated by the first indication information and the condition indicated by the third information are met.
  • the session avoids the establishment of unnecessary first network sessions and improves communication efficiency.
  • the acquiring, by the first network element, the first QoS control information of the terminal device includes: sending, by the first network element, subscription data acquisition of the first session to a third network element a request message, the subscription data acquisition request message includes fourth information, the fourth information is used to request to provide subscription data of the first network, and the first network element receives the first information from the third network element a contracted data response message of a session, the subscription data response message including second QoS control information, wherein the second QoS control information is subscription data of the first network provided by the fourth information request.
  • the acquiring, by the first network element, the first QoS control information according to the second QoS control information includes: determining, by the first network element, the second QoS control information The first QoS control information; or the first network element sends the second QoS control information to a policy control network element; the first network element receives the first QoS from the policy control network element Control information, wherein the first QoS control information is based on the second QoS control information, and the first QoS control information is information authorized by the policy control network element.
  • the fourth information includes an access point name APN of the first network.
  • the acquiring, by the first network element, the first QoS control information of the terminal device includes: the first network element receiving the first QoS control information from the policy control network element Wherein the first QoS control information is authorized.
  • the method further includes: the first network element sends a setup request message of the first session to a policy control network element, where the setup request message of the first session includes a fifth information.
  • the fifth information is used to indicate that the policy control network element establishes a session of the first network; the first network element receives the first QoS control information from the policy control network element, including: The first network element receives the setup response message of the first session from the policy control network element, where the setup response message of the first session includes the first QoS control information.
  • the first QoS control information includes at least one of the following: a QoS parameter, an identifier of the QoS parameter, a packet filter, and priority information of the packet filter.
  • the first network element receives the first indication information from the second network element, where the first network element receives the management request of the first session from the second network element.
  • the message that the management request message of the first session includes the first indication information.
  • the first QoS control information is carried in a first session management message, where the first session management message is used to indicate to modify or establish QoS control in the first network of the terminal device. information.
  • the second aspect provides a communication method, including: sending, by the second network element, the first indication information to the first network element, where the first indication information is used to indicate that the current condition supports establishing a session of the first network for the terminal device; Receiving, by the second network element, the first quality of service QoS control information of the first session of the terminal device from the first network element, where the first session is a session established by the terminal device through the second network .
  • the first session may be established while establishing the second network session of the first session, if the condition indicated by the first indication information is met.
  • the session of the first network can determine the session of the first network establishing the first session according to the current condition, avoiding establishing an unnecessary session of the first network, and improving communication efficiency.
  • the method further includes: the second network element receives the second indication information from the terminal device, where the second indication information is used to indicate that the current condition supports establishing the first network for the terminal device.
  • the second network element determines the first indication information according to the second indication information.
  • the first indication information includes first information, where the first information is used to indicate that the current condition is a mobility management entity of the second network and the first network. There is a communication interface between the mobility management entities.
  • the first information includes a default bearer identifier of the first network of the terminal device.
  • the first indication information further includes second information, where the second information is used to indicate that the current condition is that the terminal device is in a single registration state.
  • the first QoS control information includes at least one of the following: a QoS parameter, an identifier of the QoS parameter, a packet filter, and priority information of the packet filter.
  • the sending, by the second network element, the first indication information to the first network element the second network element sending the management request of the first session to the first network element
  • the message that the management request message of the first session includes the first indication information.
  • the third aspect provides a communication method, including: the terminal device sends the second indication information to the second network element, where the second indication information is used to indicate that the current condition supports establishing a session of the first network for the terminal device; The terminal device receives first quality of service QoS control information of the first session of the terminal device, where the first session is a session established by the terminal device through the second network.
  • the terminal device sends the second indication information to the second network element to indicate that the current condition supports establishing a session of the first network for the terminal device, so that the second network element determines the first indication according to the second indication information.
  • the information can be configured to enable the network side to determine the session of the first network that establishes the first session according to the current condition, thereby avoiding establishing an unnecessary session of the first network, and improving communication efficiency.
  • the second indication information includes first information, where the first information is used to indicate that the current condition is a mobility management entity of the second network and the first network. There is a communication interface between the mobility management entities.
  • the first information includes a default bearer identifier of the first network of the terminal device.
  • the second indication information further includes second information, where the second information is used to indicate that the current condition is that the terminal device is in a single registration state.
  • the first QoS control information includes at least one of the following: a QoS parameter, an identifier of the QoS parameter, a packet filter, and priority information of the packet filter.
  • the first QoS control information is carried in a second session management message, where the second session management message is used to indicate to modify or establish QoS control in the first network of the terminal device. information.
  • the fourth aspect provides a network element, including: a receiving unit, configured to receive first indication information from a second network element, where the first indication information is used to indicate that the current condition supports establishing a session of the first network for the terminal device.
  • Obtaining unit configured to acquire first quality of service QoS control information of the first session of the terminal device after receiving the first indication information, where the first session is that the terminal device passes the second network
  • the sending unit is configured to send the first QoS control information to the second network element.
  • the first indication information includes first information, where the first information is used to indicate that the current condition is a mobility management entity of the second network and the first network. There is a communication interface between the mobility management entities.
  • the first information includes a default bearer identifier of the first network of the terminal device.
  • the first indication information further includes second information, where the second information is used to indicate that the current condition is that the terminal device is in a single registration state.
  • the acquiring unit is further configured to acquire third information, where the third information is used to indicate that the attribute of the first session is to ensure continuity; After obtaining the first QoS control information of the terminal device, the acquiring unit is configured to acquire the first QoS control information after acquiring the first indication information and the third information.
  • the acquiring unit is specifically configured to send, by the third network element, a subscription data acquisition request message of the first session, in the acquiring the first QoS control information of the terminal device, where
  • the subscription data acquisition request message includes fourth information, the fourth information is used to request to provide subscription data of the first network, and the subscription data response message of the first session is received from the third network element,
  • the subscription data response message includes second QoS control information for the first network, wherein the subscription data of the first network is provided for the fourth information request.
  • the acquiring unit is specifically configured to determine, according to the second QoS control information, the first QoS control information, First QoS control information; or transmitting the second QoS control information to a policy control network element; and receiving the first QoS control information from the policy control network element, wherein the first QoS control information is based on
  • the second QoS control information is information that is authorized by the policy control network element.
  • the fourth information includes an access point name APN of the first network.
  • the acquiring unit is specifically configured to receive the first QoS control information from the policy control network element, where the acquiring the first QoS control information of the terminal device, where The first QoS control information is information that the policy controls network element authorization.
  • the sending unit is further configured to send, to the policy control network element, the setup request message of the first session, where the setup request message of the first session includes fifth information, where the fifth The information is used to indicate that the policy control network element establishes a session of the first network; in the receiving the first QoS control information from the policy control network element, the acquiring unit is specifically configured to use the policy The control network element receives the setup response message of the first session, where the setup response message of the first session includes the first QoS control information.
  • the first QoS control information includes at least one of the following: a QoS parameter, an identifier of the QoS parameter, a packet filter, and priority information of the packet filter.
  • the receiving unit is configured to receive, by the second network element, a management request message of the first session, where the first indication information is received from the second network element, where The management request message of a session includes the first indication information.
  • the first QoS control information is carried in a first session management message, where the first session management message is used to indicate to modify or establish QoS control in the first network of the terminal device. information.
  • the fifth aspect provides a network element, including: a sending unit, configured to send first indication information to the first network element, where the first indication information is used to indicate that the current condition supports establishing a session of the first network for the terminal device. a receiving unit, configured to receive first quality of service QoS control information of the first session of the terminal device from the first network element, where the first session is a session established by the terminal device through a second network .
  • the receiving unit is further configured to receive, by the terminal device, the second indication information, where the second indication information is used to indicate that the current condition supports establishing a session of the first network for the terminal device;
  • the element further includes a determining unit, and the determining unit is configured to determine the first indication information according to the second indication information.
  • the first indication information includes first information, where the first information is used to indicate that the current condition is a mobility management entity of the second network and the first network. There is a communication interface between the mobility management entities.
  • the first information includes a default bearer identifier of the first network of the terminal device.
  • the first indication information further includes second information, where the second information is used to indicate that the current condition is that the terminal device is in a single registration state.
  • the first QoS control information includes at least one of the following: a QoS parameter, an identifier of the QoS parameter, a packet filter, and priority information of the packet filter.
  • the sending unit is specifically configured to send, to the first network element, a management request message of the first session, in the sending the first indication information to the first network element, where The management request message of the first session includes the first indication information.
  • the first QoS control information is carried in a first session management message, where the first session management message is used to indicate to modify or establish QoS control in the first network of the terminal device. information.
  • the sixth aspect provides a terminal device, including: a sending unit, configured to send second indication information to a second network element, where the second indication information is used to indicate that the current condition supports establishing a first network for the terminal device. a receiving unit, configured to receive first quality of service QoS control information of the first session of the terminal device, where the first session is a session established by the terminal device through the second network.
  • the second indication information includes first information, where the first information is used to indicate that the current condition is a mobility management entity of the second network and the first network. There is a communication interface between the mobility management entities.
  • the first information includes a default bearer identifier of the first network of the terminal device.
  • the second indication information further includes second information, where the second information is used to indicate that the current condition is that the terminal device is in a single registration state.
  • the first QoS control information includes at least one of the following: a QoS parameter, an identifier of the QoS parameter, a packet filter, and priority information of the packet filter.
  • the first QoS control information is carried in a second session management message, where the second session management message is used to indicate to modify or establish QoS control in the first network of the terminal device. information.
  • the seventh aspect provides a communication system, which includes the network element according to the fourth aspect and the fifth aspect.
  • the communication system may further include the terminal device according to the sixth aspect.
  • a network element comprising: a communication interface, a memory, a processor, and a bus system.
  • the communication interface, the memory and the processor are connected by the bus system, the memory is for storing instructions, the processor is configured to execute instructions stored by the memory to control the communication interface to receive signals and/or transmit signals, and When the processor executes the instructions stored by the memory, the execution causes the processor to perform the method of the first aspect or any of the possible implementations of the first aspect.
  • a network element comprising: a communication interface, a memory, a processor, and a bus system.
  • the communication interface, the memory and the processor are connected by the bus system, the memory is for storing instructions, the processor is configured to execute instructions stored by the memory to control the communication interface to receive signals and/or transmit signals, and When the processor executes the instructions stored by the memory, the execution causes the processor to perform the method of any of the possible implementations of the second aspect or the second aspect.
  • a terminal device comprising: a communication interface, a memory, a processor, and a bus system.
  • the communication interface, the memory and the processor are connected by the bus system, the memory is for storing instructions, the processor is configured to execute instructions stored by the memory to control the communication interface to receive signals and/or transmit signals, and
  • the processor executes the instructions stored by the memory, the execution causes the processor to perform the method of any of the possible implementations of the third aspect or the third aspect.
  • a communication system comprising the network element according to the eighth aspect, the ninth aspect, and optionally the terminal system.
  • a twelfth aspect a computer readable medium for storing a computer program comprising instructions for performing the method of the first aspect or any of the possible implementations of the first aspect.
  • a thirteenth aspect a computer readable medium for storing a computer program, the computer program comprising instructions for performing the method of the second aspect or any of the possible implementations of the second aspect.
  • a fourteenth aspect a computer readable medium for storing a computer program, the computer program comprising instructions for performing the method of any of the third or third aspect of the third aspect.
  • FIG. 1 is a schematic diagram of a possible application environment of an embodiment of the present application.
  • FIG. 2 is a schematic diagram of a possible application environment of still another embodiment of the present application.
  • FIG. 3 is a schematic diagram of a possible application environment of still another embodiment of the present application.
  • FIG. 4 is a schematic flowchart diagram of a communication method according to an embodiment of the present application.
  • FIG. 5 is a schematic diagram of interaction of a communication method according to another embodiment of the present application.
  • FIG. 6 is a schematic diagram of interaction of a communication method according to another embodiment of the present application.
  • FIG. 7 is a schematic diagram of interaction of a communication method according to another embodiment of the present application.
  • FIG. 8 is a schematic diagram of interaction of a communication method according to another embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of a network element according to an embodiment of the present application.
  • FIG. 10 is a schematic structural diagram of a network element according to another embodiment of the present application.
  • FIG. 11 is a schematic structural diagram of a terminal device according to an embodiment of the present application.
  • FIG. 12 is a schematic structural diagram of a network element according to another embodiment of the present application.
  • FIG. 13 is a schematic structural diagram of a network element according to another embodiment of the present application.
  • FIG. 14 is a schematic structural diagram of a terminal device according to another embodiment of the present application.
  • GSM Global System of Mobile communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • UMTS Universal Mobile Telecommunication System
  • WiMAX Worldwide Interoperability for Microwave Access
  • Evolved Packet System Evolved Packet System, EPS
  • 5G 5th Generation
  • NR New Radio
  • the terminal device in the embodiment of the present application may refer to a user equipment, an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, or User device.
  • the terminal device may also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), with wireless communication.
  • SIP Session Initiation Protocol
  • WLL Wireless Local Loop
  • PDA Personal Digital Assistant
  • the base station in this embodiment of the present application may be a device for communicating with a terminal device, which may be in a Global System of Mobile communication (GSM) system or in Code Division Multiple Access (CDMA).
  • Base station Base Transceiver Station, BTS
  • BTS Base Transceiver Station
  • NodeB, NB base station
  • WCDMA Wideband Code Division Multiple Access
  • Evolutional NodeB evolved base station
  • the eNB or the eNodeB may also be a wireless controller in a cloud radio access network (CRAN) scenario, and the embodiment of the present application is not limited.
  • CRAN cloud radio access network
  • the network element in the embodiment of the present application may include a network device in a 5G system architecture and/or a 4G system architecture.
  • the 4G system architecture may include an EPS system architecture.
  • the network element may include an Access and Mobility Management Function (AMF) entity, a Mobility Management Entity (MME), a Session Management Function (SMF) entity, and a unified data management.
  • AMF Access and Mobility Management Function
  • MME Mobility Management Entity
  • SMF Session Management Function
  • UDM Unified Data Management
  • PCF Policy Control Function
  • PCF Policy and Charging Rule Function
  • PDN Packet Data Network
  • PDU Packet Data Unit
  • PDU Packet Data Unit
  • PGW-C PDN Gateway-Control Plane
  • PGW-User plane PDN Gateway-User plane
  • HSS Home Subscriber Server
  • AF Application Function
  • QoS flow The minimum QoS forwarding processing granularity in a 5G system. All services mapped to the same QoS flow receive the same forwarding processing, such as packet loss rate and packet delay budget. Different QoS forwarding processes require different 5G QoS flows.
  • FIG. 1 shows an interworking architecture 100 between a 5G system and an EPS system in a non-roaming scenario.
  • Figure 2 illustrates an interworking architecture 200 for a 5G system and an EPS system in a local breakout roaming scenario.
  • 3 shows an interworking architecture 300 between a 5G system and an EPS system in a home-route or home-routed roaming scenario.
  • a first interface in order to support the interworking of the 5G system and the EPS system, a first interface is introduced.
  • the first interface refers to a communication interface between a mobility management entity of the 5G system and a mobility management entity of the EPS system.
  • the mobility management entity of the 5G system may be an AMF
  • the mobility management entity of the EPS system may be an MME.
  • the foregoing first interface may be represented by an N26 interface.
  • the interworking architecture can support switching between 5G and EPS systems. It should be noted that, in the interworking architecture, the support for the N26 interface is optional. Only in the interworking network supporting the N26 interface can the switching process be used to ensure service continuity.
  • the network element in the EPS system and the network element in the 5G system may be included.
  • Some of the modules in architectures 100-300 include the functionality of network elements in the EPS system and network elements in the 5G system.
  • HSS+UDM module, PCF+PDRF module, SMF+PGW-C module, UPF+PGW-U module, the modules and communication interfaces involved in architecture 100-300 are described below.
  • UPF+PGW-U module used for transmission and management of user data.
  • this module can be used for both EPS data transmission and 5G data transmission.
  • SMF+PGW-C module used for session establishment, deletion and modification management.
  • this module can not only provide EPS session management functions, but also provide 5G session management functions.
  • PCF+PCRF module used in the policy and charging control entity.
  • the module can provide EPS policy and charging control for terminal devices, and provide 5G policy and charging control.
  • HSS+UDM module used to store subscription data of a user.
  • the module stores both the subscription information of the EPS of the terminal device and the subscription information of the 5G of the terminal device.
  • 5G radio access network Provides a wireless air interface for the terminal device to access the core network to obtain the corresponding service.
  • Application Function (Application Function, AF), interacts with the core network to provide services or services, supports access capability open functions, interacts with the policy architecture, and provides application information.
  • AF Application Function
  • N5 interface An interface between the PCF and the AF.
  • the AF directly interacts with the PCF to transmit information related to the service.
  • NEF Network Exposure Function
  • Pnt interface An interface between the PCF and the NEF for the interaction between the NEF and the PCF.
  • Third-party AF can interact with PCF through NEF.
  • An evolved universal terrestrial radio access network (E-UTRAN) is used for radio resource management to establish, modify, or delete air interface resources for a terminal device. Provides transmission of data and signaling to the terminal device, and the like.
  • AMF module for user access and mobility management, mainly including user registration management, reachability management mobility management, paging management, access authentication, and encryption and integrity protection for authorized non-access layer signaling. Wait.
  • MME module Mobility management for users. For example, it mainly includes user attachment management, reachability management, mobility management, paging management, access authentication, and encryption and integrity protection for authorizing non-access stratum signaling.
  • SGW module the gateway of the user plane, and the user plane endpoint of E-UTRAN.
  • SGW module the gateway of the user plane, and the user plane endpoint of E-UTRAN.
  • S1-MME interface A control plane interface between the MME and the E-UTRAN.
  • S1-U interface User plane interface between S-GW and E-UTRAN.
  • S5-U interface A user plane interface between the SGW and the PGW-U for transmitting user plane data of the UE.
  • the S5-C interface is a control plane management interface between the SGW and the PGW-U, and is used to establish an SGW and a PGW-U user plane connection for the UE.
  • S6a interface An interface between the MME and the HSS, configured to acquire subscription data of the user and perform authentication and authorization functions for the UE.
  • S11 interface An interface between the SGW and the MME, used to establish a bearer of the user plane.
  • N1 interface interface between the UE and the AMF, signaling management and transmission of the user non-access stratum.
  • N2 interface (R) The interface between AN and AMF for signaling transmission.
  • N3 interface A direct interface between UPF and (R)AN for transmitting user data.
  • N4 interface An interface between the SMF and the UPF to establish a transmission channel for the user plane.
  • N7 interface An interface between the SMF and the PCF. It is used to formulate and deliver policy control and accounting information.
  • N8 interface An interface between the AMF and the UDM, which is used to obtain the mobility related subscription information of the user.
  • N10 interface An interface between the SMF and the UDM. It is used to obtain the session management related subscription information of the user.
  • N11 interface An interface between SMF and AMF for the transmission of session management information.
  • N15 interface An interface between AMF and PCF for obtaining access and mobility related policy information.
  • h-PCF+h-PCRF indicates the policy control body that supports interworking in the home network or the home network. It supports both 4G policy and charging control functions, and 5G policy and charging control functions.
  • the S9/N15 interface represents the interface between the home network or the PCF in the home network.
  • v-PCF+v-PCRF indicates the policy control body that supports interworking in the roaming network or the visited network. It supports both 4G policy and charging control functions, and 5G policy and charging control functions.
  • v-SMF represents the SMF in the roaming network.
  • v-PCF represents a PCF in a roaming network.
  • HPLMN in FIGS. 2 and 3 represents a local network
  • the VPLMN represents an access network or a roaming network.
  • HPLMN stands for public land mobile network (HPLMN)
  • VPLMN stands for visit or roaming PLMN.
  • the terminal device may access the EPS system by using a Tracking Area Update (TAU).
  • TAU Tracking Area Update
  • the switching process between the 5G system and the EPS system mainly includes the following two methods: First, mobility management/session management during the interoperation of the 5G system and the EPS system (Mobility Management) /Session Management, MM/SM) Context mapping. Second, support the solution of reconstructing the MM/SM context during EPS and 5G handover.
  • the process of the 5G system switching to the EPS system specifically includes: establishing an EPS QoS parameter and an EPS bearer identifier (ID) when establishing a 5G QoS flow in the 5G network.
  • the establishing the EPS QoS parameter and the EPS bearer identifier includes: establishing a default EPS bearer corresponding to the QoS of the 5G default rule; and further comprising: establishing a corresponding corresponding to the 5G Guaranteed Bit Rate (GBR) QoS flow.
  • GBR Guaranteed Bit Rate
  • the embodiment of the present application is based on the interworking architecture of the 5G system and the EPS system, and proposes a communication method, which can establish a session of the EPS system while establishing a 5G system session according to the network requirement, thereby being able to determine whether to establish an EPS session according to current conditions. , avoiding the establishment of unnecessary EPS sessions and improving communication efficiency.
  • the communication method of the embodiment of the present application will be described below with reference to FIG. 4.
  • the method 400 of FIG. 4 can be applied to any of the architectures of FIGS. 1-3.
  • the method of Figure 4 can be applied to other similar architectures as well.
  • the first network may include an EPS system network or a 4G system network
  • the second network may include a 5G system network.
  • the first network element may be an SMF or an entity having SMF functionality.
  • it may be an SMF+PGW-C module in the architecture 100-300
  • the second network element may be an AMF or an AMF-capable entity.
  • the third network element may be a UDM or an entity having UDM functionality, such as may be an HSS+UDM module in architecture 100-300.
  • the policy control network element may be a PCF or an entity having a PCF function, such as a PCF+PCRF module in the architecture 100-300.
  • Method 400 includes:
  • the second network element sends the first indication information to the first network element, and the first network element receives the first indication information from the second network element, where the first indication information is used by the first network element.
  • the foregoing current condition supports establishing a session of the first network for the terminal device, and may include: an N26 interface exists between the 5G system and the EPS system in the current network. In other words, there is a communication interface between the AMF in the 5G system and the MME in the EPS system.
  • the foregoing current condition supports establishing a session of the first network for the terminal device, and may further include: the terminal device is in a single registration state.
  • the first indication information may include first information, and the first information may indicate, in an explicit or implicit manner, that the current condition supports establishing a session of the first network for the terminal device.
  • the first information may directly indicate that the mobility management entity of the second network has a communication interface with the mobility management entity of the first network.
  • the first information is used to indicate that the current network supports the N26 interface between the AMF and the MME, or that the 5G network supports interworking with the 4G network.
  • the first information may be a default bearer identifier of the first network of the terminal device, and the bearer identifier of the first network of the terminal device may be used to implicitly indicate that the current condition supports establishing the first device for the terminal device. Network session.
  • the bearer identifier of the first network may be a dedicated bearer identifier of the first network, or may be a default bearer identifier of the first network.
  • the default bearer identifier of the first network may be an EPS default bearer identifier of the terminal device
  • the dedicated bearer identifier of the first network may be an EPS dedicated bearer identifier of the terminal device.
  • the first network element determines, according to the first information included in the first indication information, the first quality of service QoS control information of the first session of the terminal device that needs to acquire the first network, so that the first indication information is obtained according to the first indication information. Determining the establishment of the session of the first network avoids establishing an unnecessary first network session and improves communication efficiency.
  • the content of the first information is implicitly indicated by carrying the default bearer identifier of the first network of the terminal device in the first information, thereby saving overhead.
  • the current condition supports the establishment of the session of the first network for the terminal device, and may further include: the terminal device is in a single registration state.
  • the terminal device is in a single registration state, it means that the terminal device can only register in one of the first network or the second network at the same time, for example, can only be registered in the 5G system or can only be in the EPS system. Registered in.
  • the terminal device is in the dual registration state, it indicates that the terminal device can be registered in the first network and the second network at the same time, for example, can be registered in both the 5G network and the EPS network.
  • the first network element determines that a session of the first network needs to be established for the terminal device. If the terminal device is in the dual registration state, that is, the terminal device establishes a context with the first network and the second network at the same time, the terminal device can select any network to perform service transmission at any time. For example, the terminal device is established in the 5G system and the EPS system at the same time. Context.
  • the first indication information may further include second information, where the second information is used to indicate that the terminal device is in a single registration state.
  • the first indication information includes the first information and the second information, and may establish the first time while establishing the second network session of the first session, if the condition indicated by the first indication information is met.
  • the session of the first network of the session avoids establishing an unnecessary session of the first network and improves communication efficiency.
  • the receiving, by the first network element, the first indication information from the second network element may include: the first network element receiving, from the second network element, a management request message of the first session, where The management request message of a session includes the first indication information.
  • the management request message of the first session described above may include multiple types.
  • the management request message of the first session may include any one of the following: a PDU session establishment request message of the first session, and a PDU session modification request message of the first session.
  • the management request message of the first session may be a service request of a serviced interface, such as a Namf communication (communication) or an Nsmf_PDU session service.
  • Namf refers to the service provided by AMF, which includes the communication or session management provided by SMF, that is, the service.
  • Step 402 After receiving the first indication information, the first network element acquires first QoS control information of the first session of the terminal device, where the first session is the terminal device The second network established session.
  • the first QoS control information may be used to control the quality of service of the service transmitted in the first network.
  • the first QoS control information may be control information related to the quality of service of the traffic transmitted in the first network.
  • the first QoS control information may include at least one of the following: a QoS parameter, an identifier of a QoS parameter, a packet filter, and priority information of a packet filter.
  • the first network element may determine, according to the first indication information, whether a session of the first network needs to be established for the terminal device. For example, after receiving the first indication information, the first network element may directly determine that a session of the first network needs to be established for the terminal device. Alternatively, after receiving the first indication information, the first network element may synthesize the first indication information and other information to determine whether a session of the first network needs to be established for the terminal device. For example, the other information described above may be the following third information.
  • the method 400 further includes: the first network element acquiring third information, where the third information is used to indicate that the attribute of the first session is to ensure continuity.
  • the third information may be session continuity mode information of the first session or service and session continuity mode (SSC_mode) information of the first session.
  • the foregoing third information may indicate that the attribute of the first session is to ensure continuity or to indicate that the attribute of the first session is not guaranteed to be continuous.
  • the first network element itself stores the third information, or the first network element may obtain the subscription data from the UDM, and the third information may be included in the subscription data obtained from the UDM.
  • the third information may be SSC_mode information.
  • the first network element obtains the SSC_mode information of the first session from the UDM. If the SSC_mode indicates that the session mode is the first mode, the first session may be used to ensure continuity. If the SSC_mode indicates that the session mode is the second mode, it may indicate that the first session is not guaranteed to be continuous.
  • the first network element may further determine whether the attribute of the first session is guaranteed continuity. If the attribute of the first session is to ensure continuity, the first network element may determine that a session of the first network needs to be established for the terminal device. If the attribute of the first session is that continuity is not guaranteed, the first network element may determine that the session of the first network does not need to be established for the terminal device.
  • the first network of the first session may be established while establishing the second network session of the first session, if the network requirement indicated by the first indication information and the condition indicated by the third information are met.
  • the session avoids the establishment of unnecessary first network sessions and improves communication efficiency.
  • the third information indicates that the attribute of the first session is that continuity is not required, the first network element does not need to establish a session of the first network for the terminal device, which saves communication resources.
  • the first network element may acquire the first QoS control information of the terminal device.
  • the first QoS control information is QoS control information of a service transmitted in an EPS system.
  • the first QoS control information may include at least one of the following: a QoS parameter, an identifier of the QoS parameter, a packet filter, and priority information of the packet filter.
  • the QoS parameter in the first QoS control information may be the QoS parameter of the EPS default bearer of the terminal device, or may be the QoS parameter of the EPS dedicated bearer of the terminal device, and the priority information of the packet filter and the packet filter is
  • the EPS carries a corresponding Traffic Flow Template (TFT), and the service flow template includes at least one packet filter.
  • TFT Traffic Flow Template
  • the acquiring, by the first network element, the first QoS control information of the terminal device may include at least two modes.
  • the first network element may obtain second QoS control information from the third network element, and determine the first QoS control information according to the second QoS control information.
  • the first network element can determine the first QoS control information in two ways. In the first path, the first network element may not modify the second QoS control information, and determine the second QoS control information as the first QoS control information.
  • the first network element may send the second QoS control information to the policy control network element, and after receiving the second QoS control information, the policy control network element may be configured according to the second QoS control information. Determining first QoS control information, the first QoS control information being information authorized by a policy control unit.
  • the policy control network element may modify the second QoS control information to obtain the authorized first QoS control information. Alternatively, the policy control network element may not modify the second QoS control information to obtain the authorized first QoS control information.
  • the policy control network element may send the first QoS control information of the authorization to the first network element.
  • the first network element may receive the first QoS control information from a policy control network element, where the first QoS control information is information that is authorized by the policy control network element.
  • the policy control network element can obtain the first QoS control information in two ways. In the first approach, the policy control network element can generate the first QoS control information. In the second method, the policy control network element may obtain the subscribed third QoS control information from the fourth network element, where the policy control network element may determine the first QoS control information according to the third QoS control information. . Specifically, the policy control unit may select to modify or not modify the third QoS control information to obtain the first QoS control information.
  • the first network element sends a subscription data acquisition request message of the first session to a third network element, where the subscription data acquisition request message includes fourth information, where The fourth information is used to request to provide subscription data of the first network; the first network element receives a subscription data response message of the first session from the third network element, where the subscription data response message includes a second QoS And control information, wherein the second QoS control information is contracted; and the first network element acquires the first QoS control information according to the second QoS control information.
  • the fourth information may include a data network name (DNN) and indicate that subscription data of the first network needs to be acquired.
  • the fourth information may further include an access point name (APN) of the first network to indicate that subscription data of the first network needs to be acquired.
  • DNN data network name
  • API access point name
  • the acquiring, by the first network element, the first QoS control information according to the second QoS control information may include: determining, by the first network element, the second QoS control information as the first QoS control information; or, the first network element sends the second QoS control information to the policy control network element; the first network element receives the first QoS control information from the policy control network element, where The first QoS control information is based on the second QoS control information, and the first QoS control information is information authorized by the policy control network element.
  • the method 400 further includes: the first network element sending the setup request message of the first session to a policy control network element, where the setup request message of the first session includes a fifth Information, the fifth information is used to indicate that the policy control network element establishes a session of the first network; the first network element receives the first QoS control information from the policy control network element, including: The first network element receives the setup response message of the first session from the policy control network element, where the setup response message of the first session includes the first QoS control information.
  • Step 403 The first network element sends the first QoS control information to the second network element, and correspondingly, the second network element receives the first QoS control information from the first network element. .
  • the foregoing first QoS control information may be carried in a first session management message, where the first session management message may be used to indicate to modify or establish QoS control information in the first network of the terminal device.
  • the foregoing first session management message may include multiple types.
  • the foregoing first session management message may include any one of the following: a session establishment message, a session modification message.
  • the first session management message may be a service interface based message.
  • a communication method is proposed.
  • the second network session of the first session may be established. And establishing a session of the first network of the first session, so that the session of the first network establishing the first session is determined according to the current condition, thereby avoiding establishing an unnecessary session of the first network, and improving communication efficiency.
  • method 400 further includes a portion of step 404.
  • the terminal device sends the second indication information to the second network element, and the second network element receives the second indication information, where the second indication information is used to indicate that the current condition is supported by the The terminal device establishes a session of the first network.
  • the second network element may have at least two ways to determine the first indication information.
  • the second network element may receive the second indication information from the terminal device, and may determine the first indication information according to the second indication information.
  • the second network element determines, by using the second indication information, that the current network condition indicates that the terminal device establishes the session of the first network, and may send the first indication information to the first network element to indicate that the current condition is supported as the terminal device. Establish a session for the first network.
  • the second indication information may include the foregoing first information, and further, the second indication information may further include the foregoing second information.
  • the terminal device may acquire the fifth information from the second network element in the process of registering the network, where the fifth information is used to indicate that a communication interface exists between the mobility management entity of the second network and the mobility management entity of the first network. And determining the first information according to the fifth information.
  • the first information can be either explicit or implicit.
  • the second network element may generate the first indication information by itself.
  • the second network element may acquire the fifth information by itself, and then determine the first information according to the fifth information, and generate the first indication information.
  • the terminal device may send the second information to the second network element, so that the second network element adds the second information to the first indication information.
  • the first information is usually explicit.
  • the second network element can be an AMF. Therefore, the second network element is a mobility management entity of the second network, and the second network element can determine that a communication interface exists between the mobility management entity of the second network and the mobility management entity of the first network. Thus, in the presence of the communication interface, the second network element can generate the first indication information.
  • the second network element may send the first QoS control information to the base station, where the base station receives the After the first QoS control information, the first QoS control information may be sent to the terminal device.
  • method 400 also includes a portion of step 405.
  • Step 405 The second network element sends the first QoS control information to the terminal device by using a base station, and correspondingly, the terminal device receives first QoS control information of the first session of the terminal device.
  • the first session is a session established by the terminal device through the second network.
  • the first QoS control information may be used to control the quality of service of the service transmitted in the first network.
  • the first QoS control information may be control information related to the quality of service of the traffic transmitted in the first network.
  • the first QoS control information may include at least one of the following: a QoS parameter, an identifier of a QoS parameter, a packet filter, and priority information of a packet filter.
  • the first QoS control information may be carried in a second session management message, where the second session management message is used to indicate to modify or establish QoS in the first network of the terminal device. Control information.
  • the second session management message can include multiple types.
  • the second session management message may include at least one of the following: a PDU session establishment accept message, an AN-specific resource steup message, and a session modification message.
  • the foregoing message may acquire an interaction for a service of the serviced interface.
  • FIG. 5 and 6 show the communication flow of the session establishment process.
  • Figure 7 shows the communication flow during the session modification process.
  • Fig. 8 shows a communication flow in which a terminal device registers with a network.
  • the first indication information in FIG. 5 is determined according to the second indication information sent by the terminal device.
  • the first indication information in Fig. 6 is generated by the AMF.
  • the (R)AN in FIG. 5 to FIG. 8 represents an access network (AN) entity or a radio access network (RAN) entity.
  • the (R)AN may include a base station.
  • FIG. 5 shows a process in which the first indication information is determined based on the second indication information.
  • the method of Figure 5 includes:
  • the terminal device acquires, in the process of registering to the network, fifth information, where the fifth information is used to indicate that a communication interface exists between the mobility management entity of the second network and the mobility management entity of the first network.
  • the foregoing fifth information may indicate that the AMF supports the N26 interface (that is, the message interaction between the AMF and the MME) or the AMF support and the 4G interworking.
  • the terminal device sends a first PDU session establishment request to the AMF, where the first PDU session establishment request is used to request to establish a first session of the terminal device in the 5G system.
  • the first PDU session establishment request includes second indication information.
  • the second indication information may include first information, where the first information is used to indicate that the AMF supports the N26 interface or the AMF supports the 4G interworking.
  • the first information may be an EPS default bearer identifier of the terminal device.
  • the terminal device determines to initiate a session request to the network, if the AMF supports the N26 interface, it may determine that the EPS default bearer identifier is allocated.
  • the first information may be used to directly indicate that an N26 interface exists between the AMF and the MME of the EPS system.
  • the first information may be determined according to the fifth information in S501.
  • the second indication information may further include second information, where the second information is used to indicate that the current condition is that the terminal device is in a single registration state.
  • determining the condition that the EPS session needs to be established may further include: the mode of the first session of the terminal device is to maintain continuity, or the DNN indicates a voice network or other network that needs to ensure session continuity.
  • the PDU session establishment request message includes a DNN. If the terminal device has an EPS APN corresponding to the DNN, the first indication information may further include an EPS APN.
  • the AMF may acquire the subscribed UE-AMBR of the user EPS network.
  • the AMF may perform SMF selection based on the PDU session establishment request received from the terminal device.
  • the AMF sends a second PDU session establishment request to the SMF+PGW-C according to the first PDU session establishment request, where the second PDU session establishment request message includes first indication information.
  • the AMF may determine the second indication information as the first indication information.
  • the first indication information For a detailed description of the first indication information, reference may be made to the related content in FIG.
  • the second PDU session establishment request is generated according to the first PDU session request.
  • the session request of the first PDU may be carried in the second session establishment request message.
  • the first indication information may further include an EPS APN.
  • SMF+PGW-C sends a subscription data acquisition request to the UDM+HSS, where the subscription data acquisition request includes fourth information, and the fourth information is used to request to provide subscription data of the first network.
  • the fourth information may be added in the subscription data acquisition request sent to the UDM+HSS.
  • the fourth information may include DNN/APN information for instructing the UDM+HSS to simultaneously provide subscription data of the EPS when providing 5G subscription data.
  • the DNN/APN is used to indicate that the subscription data of the corresponding DNN/APN is obtained.
  • UDM+HSS sends a subscription data response message to the SMF+PGW-C.
  • the subscription data response message includes second QoS control information.
  • the second QoS control information may include EPS subscription data of the terminal device.
  • the EPS subscription data is the subscription data of a specific APN corresponding to the DNN, and includes the QoS text of the EPS subscription and the contracted APN-AMBR.
  • the QoS text of the above EPS subscription may include: a QoS class identifier (QCI), an allocation and an retention priority (ARP).
  • QCI QoS class identifier
  • ARP retention priority
  • the SMF+PGW-C sends a third PDU session establishment request to the PCF+PCRF.
  • the third PDU session request includes second QoS control information.
  • SMF+PGW-C can perform PCF selection. After selecting the PCF, the SMF+PGW-C sends a PDU session establishment request to the PCF+PCRF.
  • the PCF+PCRF sends a third PDU session setup response to the SMF+PGW-C.
  • the third PDU session setup response corresponds to the third PDU session request, and the third PDU session setup response includes the subscribed first QoS control information.
  • the first QoS control information is determined according to the second QoS control information.
  • details about the first QoS control information refer to related content in FIG. 4, and details are not described herein again.
  • the PDU session setup response can include an authorized default PCC rule.
  • the authorized default PCC rules contain authorized 5G default QoS rules and EPS default bearer information.
  • the first signed QoS control information may include the EPS default bearer information.
  • the PCF+PCRF determines that a session of the EPS system needs to be established for the terminal device. It may be indication information transmitted according to the received SMF+PGW-C.
  • the second QoS control parameter may include an EPS default bearer QoS parameter.
  • the SMF+PGW-C can allocate a 5G QoS flow ID and store the 5G QoS flow ID and the corresponding QoS flow parameters. Further, the SMF+PGW-C can store corresponding EPS default bearer information.
  • the EPS default bearer information may include a default EPS bearer ID and a default EPS QoS text. For example, the above default EPS QoS text includes QCI or ARP.
  • the EPS default bearer information and the 5G default QoS flow related information may be correspondingly stored.
  • the EPS default bearer information includes an EPS default bearer QoS parameter obtained by the SMF+PGW-C according to the obtained from the UDM+HSS and determined according to the local policy; or an EPS default bearer QoS parameter acquired by the SMF+PGW-C from the PCF+PCRF;
  • the SMF+PGW-C sends a fourth session establishment request message to the UPF+PGW-U.
  • the fourth session establishment request message is a session establishment request of the N4 interface.
  • the N4 interface is a communication interface between UPF+PGW-U and SMF+PGW-C.
  • the UPF+PGW sends a fourth session setup response message to the SMF+PGW-C.
  • the fourth session establishment response is a session establishment response message of the N4 interface.
  • the SMF+PGW-C sends a session management request determination message to the AMF, where the session management request determination message includes a second PDU session establishment response message, where the second PDU session establishment response message includes the first QoS control information.
  • the first QoS control information may include, for example, a QoS parameter of an EPS default bearer. Further, the first QoS control information includes a corresponding EPS bearer ID.
  • the AMF sends a first PDU session request response message to the 5G AN.
  • the first QoS session request response message includes the first QoS control information.
  • the foregoing first QoS control information may include a QoS parameter of an EPS default bearer. Further, the first QoS control information may further include a corresponding EPS bearer ID.
  • the first PDU session request message is a PDU session request message of the N2 interface.
  • the N2 interface is a communication interface between the AMF and the 5G RAN.
  • the AN sends an AN-dedicated resource setup message to the terminal device, where the AN-dedicated resource setup message includes the first QoS control information.
  • the establishment process of the air interface resource may be performed between the AN and the terminal device, and the first QoS control information is carried in the flow.
  • the terminal device performs uplink and downlink data transmission with the network device.
  • the AMF determines and sends the first indication information according to the second indication information sent by the terminal device, so that the network side determines the session for generating the EPS system according to the first indication information, and does not need to establish the EPS system at any time.
  • Sessions before certain conditions, send pre-established processes to minimize system overhead. Reduce unnecessary overhead caused by initiating an EPS system session at any time.
  • FIG. 6 shows a process in which the first indication information is generated by the AMF.
  • the method of Figure 6 includes:
  • the terminal device sends a first PDU session establishment request to the AMF, where the first PDU session establishment request is used to request to establish a first session of the terminal device in the 5G system.
  • the terminal device determines that a session needs to be established, and the terminal device sends the first PDU session establishment request to the AMF.
  • the AMF sends a second PDU session establishment request to the selected SMF+PGW-C according to the first PDU session establishment request, where the second PDU session establishment request message includes first indication information.
  • the second PDU session establishment request is generated according to the first PDU session establishment request.
  • the AMF generates the first indication information, and includes the first indication information in the second PDU session establishment request.
  • the first indication information may include first information, where the first information is used to indicate that the AMF supports N26 interface information or AMF supports interworking with 4G.
  • the first information may be an EPS default bearer identifier of the terminal device.
  • the terminal device determines to initiate a session request to the network, if the AMF supports the N26 interface, it may determine that the EPS default bearer identifier is allocated.
  • the first information may be used to directly indicate that an N26 interface exists between the AMF and the MME of the EPS system.
  • the AMF since the AMF itself can determine the first information, that is, the interface capability information of the N26. Therefore, the AMF may generate first indication information according to the first information, where the first indication information includes the first information. Further, the AMF may receive the second information from the terminal device, that is, the terminal device is in a single registration state. Therefore, the AMF may also add the above second information to the first indication information.
  • the optional AMF according to its own capability of supporting the N26 interface, the terminal device is in a single registration state, and includes the indication information, which is used to indicate that the session management function establishes an EPS network session, such as EPS bearer information, including QoS parameters, and the like. information.
  • SMF+PGW-C sends a subscription data acquisition request to the UDM+HSS, where the subscription data acquisition request includes fourth information, and the fourth information is used to request to provide subscription data of the first network.
  • the fourth information may be added in the subscription data acquisition request sent to the UDM+HSS.
  • the fourth information may include DNN/APN information for instructing the UDM+HSS to simultaneously provide subscription data of the EPS when providing 5G subscription data.
  • the DNN/APN is used to indicate that the subscription data of the corresponding DNN/APN is obtained.
  • UDM+HSS sends a subscription data response message to the SMF+PGW-C.
  • the subscription data response message includes second QoS control information.
  • the second QoS control information may include EPS subscription data of the terminal device.
  • the EPS subscription data is the subscription data of a specific APN corresponding to the DNN, and includes the QoS text of the EPS subscription and the contracted APN-AMBR.
  • the QoS text of the above EPS subscription may include: a QoS class identifier (QCI), an allocation and an retention priority (ARP).
  • QCI QoS class identifier
  • ARP retention priority
  • the SMF+PGW-C sends a third PDU session establishment request to the PCF+PCRF.
  • the third PDU session request includes second QoS control information.
  • SMF+PGW-C can perform PCF selection. After selecting the PCF, the SMF+PGW-C sends a PDU session establishment request to the PCF+PCRF.
  • the PCF+PCRF sends a third PDU session setup response to the SMF+PGW-C.
  • the third PDU session setup response corresponds to a third PDU session request, and the third PDU session setup response includes the subscribed first QoS control information.
  • the first QoS control information is determined according to the second QoS control information.
  • details about the first QoS control information refer to related content in FIG. 4, and details are not described herein again.
  • the PDU session setup response can include an authorized default PCC rule.
  • the authorized default PCC rules contain authorized 5G default QoS rules and EPS default bearer information.
  • the first signed QoS control information may include the EPS default bearer information.
  • the PCF+PCRF determines that a session of the EPS system needs to be established for the terminal device. It may be indication information transmitted according to the received SMF+PGW-C.
  • the second QoS control parameter may include an EPS default bearer QoS parameter.
  • the SMF+PGW-C can allocate a 5G QoS flow ID and store the 5G QoS flow ID and the corresponding QoS flow parameters. Further, the SMF+PGW-C can store corresponding EPS default bearer information.
  • the EPS default bearer information can include a default EPS bearer ID and a default EPS QoS rule. The EPS default bearer information and the 5G default QoS flow can be stored correspondingly.
  • the EPS default bearer information includes an EPS default bearer QoS parameter obtained by the SMF+PGW-C according to the obtained from the UDM+HSS and determined according to the local policy; or an EPS default bearer QoS parameter acquired by the SMF+PGW-C from the PCF+PCRF;
  • the SMF+PGW-C sends a fourth session establishment request message to the UPF+PGW-U.
  • the fourth session establishment request message is a session establishment request of the N4 interface.
  • the N4 interface is a communication interface between UPF+PGW-U and SMF+PGW-C.
  • the UPF+PGW sends a fourth session establishment response message to the SMF+PGW-C.
  • the fourth session establishment response is a session establishment response message of the N4 interface.
  • the SMF+PGW-C sends a session management request determining message to the AMF.
  • the session management request determining message includes a second PDU session setup response message, where the second PDU session setup response message includes the first QoS control information.
  • the first QoS control information may include, for example, a QoS parameter of an EPS default bearer. Further, the first QoS control information includes a corresponding EPS bearer ID. Optionally, the QoS control information may further include TFT information.
  • the AMF sends a first PDU session request response message to the 5G AN.
  • the first QoS session request response message includes the first QoS control information.
  • the foregoing first QoS control information may include a QoS parameter of an EPS default bearer. Further, the first QoS control information may further include a corresponding EPS bearer ID.
  • the first PDU session request message is a PDU session request message of the N2 interface.
  • the N2 interface is a communication interface between the AMF and the 5G RAN.
  • the method further includes: the terminal device allocates a default EPS bearer identifier.
  • the AN sends an AN-dedicated resource setup message to the terminal device, where the AN-dedicated resource setup message includes the first QoS control information.
  • the establishment process of the air interface resource may be performed between the AN and the terminal device, and the first QoS control information is carried in the flow.
  • the terminal device performs uplink and downlink transmission with the network device.
  • the AMF autonomously generates the first indication information, so that the network side determines the session for generating the EPS system according to the first indication information, and does not need to establish the session of the EPS system at any time, and sends the pre-established session under certain conditions.
  • Figure 7 shows the communication flow of session modification.
  • S701, S702, and S703 are three parallel steps, and when executed, any one of steps S701, S702, and S703 can be executed.
  • the first QoS control information may include established or modified EPS bearer information.
  • the method of Figure 7 includes:
  • the terminal device sends a PDU session modification request to the AMF. Further, after receiving the PDU modification request, the AMF sends the PDU session modification request to the SMF+PGW-C.
  • the PDU session modification request is used to indicate that the QoS parameters of the 5G are modified, and the EPS session bearer parameters are instructed to be modified.
  • the terminal device when the terminal device determines that it is necessary to modify an existing PDU session, the terminal device transmits a PDU session modification request to the AMF, and the AMF sends a PDU session modification request to the SMF+PGW-C.
  • the terminal device can use the flow to modify an existing QoS resource, or delete an already established QoS resource or delete a service on a QoS resource.
  • S702 The AF sends a session establishment request to the PCF+PCRF, and simultaneously establishes an EPS session bearer.
  • the session establishment request is a session establishment request of the N5 interface.
  • the N5 interface is a communication interface between the AF and the PCF+PCRF.
  • the AF may actively request the network to establish resources for the service, and when needed, initiate an N5 session establishment process to the PCF+PCRF to provide service information and service QoS requirements.
  • the PCF+PCRF determines according to the previous SMF request service transmission indication, and when determining the 5G QoS rule, simultaneously establishes the EPS QoS rule, and sends the determined 5G QoS to the SMF+PGW-C. PDU-CAN modification request for rules and EPS QoS rules.
  • S703, SMF+PGW-C determines that the QoS parameters of the 5G QoS flow need to be modified, and determines that the QoS parameters of the EPS bearer need to be modified.
  • the SMF+PGW-C determines to modify the QoS parameters of the 5G QoS flow according to the local policy, and determines to modify the QoS parameters of the EPS bearer according to the first indication information received during the session establishment process.
  • S704 SMF+PGW-C and PCF+PCRF perform a PDU session modification process.
  • the PDU session modification process is similar to the PDU session establishment process. For details, refer to S506-S507 in FIG. 5 and S605-S606 in FIG. 6.
  • SMF+PGW-C stores or updates the QoS parameters of the EPS bearer.
  • the SMF+PGW-C saves the updated new 5G QoS flow parameters while saving the QoS parameters of the corresponding EPS bearer.
  • the network determines to establish a proprietary EPS bearer, and the SMF saves the established EPS bearer when the +PGW-C saves the new 5G QoS flow information.
  • the SMF+PGW-C sends a PDU session modification request to the AMF, where the PDU session modification request includes the established or modified EPS bearer information.
  • the SMF+PGW-C sends a session management request to the AMF, and the session management request includes a PDU session modification request, and the PDU session modification request includes the established or modified EPS bearer information.
  • the AMF sends a PDU session request to the (R)AN, where the PDU session request includes the established or modified EPS bearer information.
  • the PDU session request in S707 is a PDU session request of the N2 interface.
  • the N2 interface is the communication interface between the AMF and the AN.
  • the AN sends an AN dedicated resource modification message to the terminal device, where the AN dedicated resource modification message includes the established or modified EPS bearer information.
  • an AN dedicated resource modification procedure is performed between the terminal device and the AN, and in the process, the AN sends the established or modified EPS bearer information to the terminal device. If the terminal device determines to create new EPS bearer information, the EPS bearer identifier is allocated for the bearer information.
  • the AN sends a PDU session request confirmation message to the AMF.
  • the PDU session request acknowledgement message in S709 is a PDU session request acknowledgement message of the N2 interface.
  • the AN sends an N2 PDU session request acknowledgement to the AMF.
  • the terminal device allocates an EPS bearer identifier
  • the PDU session request acknowledgement message may include an EPS bearer identifier.
  • the AMF sends a session right request to the SMF+PGW-C.
  • the session rights request includes an EPS bearer identifier.
  • the bearer parameters of the EPS system can be modified according to network requirements. In other words, only when certain conditions are met, the system will modify and establish the bearer parameters of the EPS system in the process of modifying the 5G session, thereby avoiding unnecessary overhead and improving communication efficiency.
  • the network side may according to whether the network supports the N26 interface, the registration mode of the terminal device, and the session mode. Determine whether to establish a session for the EPS system.
  • the SMF obtains the contracted PDN context of the EPS system while acquiring the context of the subscription of the 5G session from the UDM+HSS according to the received fourth information, and the PDN context includes the first QoS control information, for example, EPS subscribed QoS profile (subscribe access point name aggregate maximum bit rate, subscribed APN-AMBR).
  • EPS subscribed QoS profile subscribe access point name aggregate maximum bit rate, subscribed APN-AMBR
  • the SMF+PGW-C provides authorized default 5G QoS rules and authorized EPS default bearer information to the terminal device.
  • the SMF+PGW-C interacts with the PCF to obtain the authorized default 5G QoS rules and authorized EPS default bearer information. Otherwise the SMF can perform authorization according to the local policy.
  • the PCF/SMF+PGW-C determines the QoS rule of the EPS system while determining the 5G QoS rule according to the indication information. It is determined by SMF+PGW-C whether to establish a new EPS bearer bearer context. When a new EPS bearer bearer needs to be established, the EPS bearer information is sent to the terminal device and the EPS bearer ID assigned by the terminal device is received.
  • the network side may synchronously modify or delete the corresponding EPS bearer information.
  • FIG. 8 shows a communication flow of the terminal device registering to the network, and shows a process in which the terminal device acquires the fifth information when registering to the network, and the method of FIG. 8 includes:
  • the terminal device sends a registration request (register request) to the (R) AN, and accordingly, the (R) AN receives the registration request.
  • the (R)AN sends the registration request to the AMF.
  • the (R)AN can perform AMF selection and send the above registration request to the selected AMF.
  • the AMF sends a register accept message to the terminal device by using the (R)AN, where the registration accept message includes the fifth information.
  • the fifth information can be used to indicate that the mobility management entity of the second network has a communication interface with the mobility management entity of the first network.
  • the fifth information is used to indicate that the current network supports the N26 interface between the AMF and the MME.
  • the fifth information is used to indicate that the mobility management entity of the second network has communication with the mobility management entity of the first network. interface. In order to communicate according to the fifth information, the communication efficiency is improved.
  • the communication method of the embodiment of the present application is described in detail above with reference to FIG. 1 to FIG. 8.
  • the network element and the terminal device of the embodiment of the present application are described in detail below with reference to FIG. 9 to FIG.
  • FIG. 9 is a schematic block diagram of a network element 900 in the embodiment of the present application. It should be understood that the network element 900 can perform the steps performed by the first network element in the methods of FIGS. 1-8, and is not detailed herein to avoid repetition.
  • the network element 900 includes a receiving unit 910, an obtaining unit 920, and a transmitting unit 930.
  • the receiving unit 910 is configured to receive first indication information from the second network element, where the first indication information is used to indicate that the current condition supports establishing a session of the first network for the terminal device;
  • the acquiring unit 920 is configured to acquire first quality of service QoS control information of the first session of the terminal device after receiving the first indication information, where the first session is the terminal device a session established by the network;
  • the sending unit 930 is configured to send the first QoS control information to the second network element.
  • FIG. 10 is a schematic block diagram of a network element 1000 in the embodiment of the present application. It should be understood that the network element 1000 can perform the steps performed by the second network element in the methods of FIGS. 1-8, and is not detailed herein to avoid repetition.
  • the network element 1000 includes a transmitting unit 1010 and a receiving unit 1020.
  • the sending unit 1010 is configured to send first indication information to the first network element, where the first indication information is used to indicate that the current condition supports establishing a session of the first network for the terminal device;
  • the receiving unit 1020 is configured to receive first quality of service QoS control information of the first session of the terminal device from the first network element, where the first session is established by the terminal device by using a second network. Conversation.
  • FIG. 11 is a schematic block diagram of a terminal device 1100 according to an embodiment of the present application. It should be understood that the terminal device 1100 can perform the steps performed by the terminal device in the methods of FIGS. 1 to 8, and is not described in detail herein in order to avoid redundancy.
  • the terminal device 1100 includes a transmitting unit 1110 and a receiving unit 1120.
  • the sending unit 1110 is configured to send second indication information to the second terminal device, where the second indication information is used to indicate that the current condition supports establishing a session of the first network for the terminal device;
  • the receiving unit 1120 is configured to receive first quality of service QoS control information of the first session of the terminal device, where the first session is a session established by the terminal device by using the second network.
  • FIG. 12 is a schematic block diagram of a network element 1200 in the embodiment of the present application. It should be understood that the network element 1200 can perform the steps performed by the first network element in the methods of FIG. 1 to FIG. 8. To avoid repetition, details are not described herein.
  • the network element 1200 includes:
  • a memory 1210 configured to store a program
  • a communication interface 1220 configured to communicate with other devices
  • the processor 1230 is configured to execute a program in the memory 1210, when the program is executed, the processor 1230 is configured to receive, by using the communication interface 1220, first indication information from a second network element, where the first indication is The information is used to indicate that the current condition supports establishing a session of the first network for the terminal device; and after receiving the first indication information, acquiring first quality of service QoS control information of the first session of the terminal device, where The first session is a session established by the terminal device through the second network; and the first QoS control information is sent to the second network element by using the communication interface 1220.
  • FIG. 13 is a schematic block diagram of a network element 1300 in the embodiment of the present application. It should be understood that the network element 1300 can perform the steps performed by the second network element in the methods of FIG. 1 to FIG. 8. To avoid repetition, details are not described herein.
  • the network element 1300 includes:
  • a memory 1310 configured to store a program
  • a communication interface 1320 configured to communicate with other devices
  • the processor 1330 is configured to execute a program in the memory 1310, when the program is executed, the processor 1330 is configured to send, by using the communication interface 1320, first indication information to the first network element, where the first indication is The information is used to indicate that the current condition supports establishing a session of the first network for the terminal device; and receiving, by the communication interface 1320, the first quality of service QoS control information of the first session of the terminal device from the first network element, where The first session is a session established by the terminal device through the second network.
  • FIG. 14 is a schematic block diagram of a terminal device 1400 according to an embodiment of the present application. It should be understood that the terminal device 1400 can perform the various steps performed by the terminal device in the methods of FIGS. 1 through 8, and in order to avoid repetition, it will not be described in detail herein.
  • the terminal device 1400 includes:
  • a memory 1410 configured to store a program
  • a communication interface 1420 configured to communicate with other devices
  • the processor 1430 is configured to execute a program in the memory 1410, when the program is executed, the processor 1430 is configured to send, by using the communication interface 1420, second indication information to the second terminal device, where the second indication is The information is used to indicate that the current condition supports establishing a session of the first network for the terminal device; and receiving, by the communication interface 1420, first quality of service QoS control information of the first session of the terminal device, where the first The session is a session established by the terminal device through the second network.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the 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 of the embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product.
  • the technical solution of the present application which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including
  • the instructions are used to cause a computer device (which may be a personal computer, server, or network element, etc.) to perform all or part of the steps of the methods described in various embodiments of the present application.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. medium.

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Abstract

本申请提供了一种通信方法、网元、终端装置和***。该通信方法包括：第一网元从第二网元接收第一指示信息，第一指示信息用于指示当前条件支持为终端装置建立第一网络的会话；在接收第一指示信息之后，第一网元获取终端装置的第一会话的第一服务质量QoS控制信息，其中，第一会话为终端装置通过第二网络建立的会话；第一网元向第二网元发送第一QoS控制信息。本申请实施例的通信方法能够提高通信效率。

Description

通信方法、网元、终端装置和***
本申请要求于2017年11月03日提交中国专利局、申请号为201711069131.5、申请名称为“通信方法、网元、终端装置和***”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信领域，并且更具体地，涉及通信方法、网元、终端装置和***。
背景技术
在未来第五代(the fifth generation,5G)通信***的网络建设中，将存在多个网络***之间互通的网络架构。例如，该互通的网络架构可以包括5G***与演进的分组***(Evolved Packet System,EPS)，并且5G***与EPS***之间存在通信接口，以进行通信***之间的互操作。终端在接入网络的时候，网络可以为终端同时建立多个通信***中的上下文，例如，既建立5G***中的上下文，也建立EPS***中的上下文。但是，在实际通信中，可能在某个通信***中建立的上下文并不会被使用，因此为多个通信***建立上下文，将降低通信资源的利用率，增加***开销。
发明内容
本申请提供一种通信方法、网元、终端装置和***，能够提高通信效率。
第一方面，提供了一种通信方法，包括：第一网元从第二网元接收第一指示信息，所述第一指示信息用于指示当前条件支持为终端装置建立第一网络的会话；在接收所述第一指示信息之后，所述第一网元获取所述终端装置的第一会话的第一服务质量QoS控制信息，其中，所述第一会话为所述终端装置通过第二网络建立的会话；所述第一网元向所述第二网元发送所述第一QoS控制信息。
在本申请实施例中，基于第一网络和第二网络的互通架构，可以在满足第一指示信息指示的条件的情况下，在建立第一会话的第二网络会话的同时，建立第一会话的第一网络的会话，从而能够根据当前条件确定建立第一会话的第一网络的会话，避免了建立不必要的第一网络的会话，提高了通信效率。
在一种可能的实现方式中，所述第一指示信息包括第一信息，所述第一信息用于指示所述当前条件为所述第二网络的移动性管理实体与所述第一网络的移动性管理实体之间存在通信接口。
在本申请实施例中，第一网元根据第一指示信息包括的第一信息，确定获取第一网络的终端装置的第一会话的第一服务质量QoS控制信息，从而根据第一指示信息确定建立第一网络的会话，避免了建立不必要的第一网络会话，提高了通信效率。
在一种可能的实现方式中，所述第一信息包括所述终端装置的所述第一网络的默认承 载标识。
在本申请实施例中，通过在第一信息中携带终端装置的第一网络的默认承载标识，以隐式指示第一信息的内容，从而节约了开销。
在一种可能的实现方式中，所述第一指示信息还包括第二信息，所述第二信息用于指示所述当前条件为所述终端装置为单注册态。
在本申请实施例中，第一指示信息包括第一信息和第二信息，可以在满足第一指示信息指示的条件的情况下，在建立第一会话的第二网络会话的同时，建立第一会话的第一网络的会话，避免了建立不必要的第一网络的会话，提高了通信效率。
在一种可能的实现方式中，所述方法还包括：所述第一网元获取第三信息，所述第三信息用于指示所述第一会话的属性为保证连续性；在接收所述第一指示信息之后，所述第一网元获取所述终端装置的第一QoS控制信息，包括：在获取所述第一指示信息和所述第三信息之后，所述第一网元获取所述第一QoS控制信息。
在本申请实施例中，可以在满足第一指示信息指示的网络需要以及第三信息指示的条件的情况下，在建立第一会话的第二网络会话的同时，建立第一会话的第一网络的会话，避免了建立不必要的第一网络的会话，提高了通信效率。
在一种可能的实现方式中，所述第一网元获取所述终端装置的第一QoS控制信息，包括：所述第一网元向第三网元发送所述第一会话的签约数据获取请求消息，所述签约数据获取请求消息包括第四信息，所述第四信息用于请求提供所述第一网络的签约数据；所述第一网元从所述第三网元接收所述第一会话的签约数据响应消息，所述签约数据响应消息包括第二QoS控制信息，其中所述第二QoS控制信息为所述第四信息请求提供的所述第一网络的签约数据；。
在一种可能的实现方式中，所述第一网元根据所述第二QoS控制信息，获取所述第一QoS控制信息，包括：所述第一网元将所述第二QoS控制信息确定为所述第一QoS控制信息；或，所述第一网元向策略控制网元发送所述第二QoS控制信息；所述第一网元从所述策略控制网元接收所述第一QoS控制信息，其中，所述第一QoS控制信息基于所述第二QoS控制信息，所述第一QoS控制信息为被所述策略控制网元授权的信息。
在一种可能的实现方式中，所述第四信息包括所述第一网络的接入点名称APN。
在一种可能的实现方式中，所述第一网元获取所述终端装置的第一QoS控制信息，包括：所述第一网元从所述策略控制网元接收所述第一QoS控制信息，其中，所述第一QoS控制信息是授权的。
在一种可能的实现方式中，所述方法还包括：所述第一网元向策略控制网元发送所述第一会话的建立请求消息，所述第一会话的建立请求消息包括第五信息，所述第五信息用于指示所述策略控制网元建立所述第一网络的会话；所述第一网元从所述策略控制网元接收所述第一QoS控制信息，包括：所述第一网元从所述策略控制网元接收所述第一会话的建立响应消息，所述第一会话的建立响应消息包括所述第一QoS控制信息。
在一种可能的实现方式中，所述第一QoS控制信息包括以下至少一个：QoS参数、QoS参数的标识、包过滤器、包过滤器的优先级信息。
在一种可能的实现方式中，所述第一网元从第二网元接收第一指示信息，包括：所述第一网元从所述第二网元接收所述第一会话的管理请求消息，所述第一会话的管理请求消 息包括所述第一指示信息。
在一种可能的实现方式中，所述第一QoS控制信息携带于第一会话管理消息中，所述第一会话管理消息用于指示修改或建立所述终端装置的第一网络中的QoS控制信息。
第二方面，提供了一种通信方法，包括：第二网元向第一网元发送第一指示信息，所述第一指示信息用于指示当前条件支持为终端装置建立第一网络的会话；所述第二网元从所述第一网元接收所述终端装置的第一会话的第一服务质量QoS控制信息，其中，所述第一会话为所述终端装置通过第二网络建立的会话。
在本申请实施例中，基于第一网络和第二网络的互通架构，可以在满足第一指示信息指示的条件的情况下，在建立第一会话的第二网络会话的同时，建立第一会话的第一网络的会话，从而能够根据当前条件确定建立第一会话的第一网络的会话，避免了建立不必要的第一网络的会话，提高了通信效率。
在一种可能的实现方式中，所述方法还包括：所述第二网元从终端装置接收第二指示信息，所述第二指示信息用于指示当前条件支持为终端装置建立第一网络的会话；所述第二网元根据所述第二指示信息，确定所述第一指示信息。
在一种可能的实现方式中，所述第一指示信息包括第一信息，所述第一信息用于指示所述当前条件为所述第二网络的移动性管理实体与所述第一网络的移动性管理实体之间存在通信接口。
在一种可能的实现方式中，所述第一信息包括所述终端装置的所述第一网络的默认承载标识。
在一种可能的实现方式中，所述第一指示信息还包括第二信息，所述第二信息用于指示所述当前条件为所述终端装置为单注册态。
在一种可能的实现方式中，所述第一QoS控制信息包括以下至少一个：QoS参数、QoS参数的标识、包过滤器、包过滤器的优先级信息。
在一种可能的实现方式中，所述第二网元向第一网元发送第一指示信息，包括：所述第二网元向所述第一网元发送所述第一会话的管理请求消息，所述第一会话的管理请求消息包括所述第一指示信息。
在一种可能的实现方式中，所述第一QoS控制信息携带于第一会话管理消息中，所述第一会话管理消息用于指示修改或建立所述终端装置的第一网络中的QoS控制信息。
第三方面，提供了一种通信方法，包括：终端装置向第二网元发送第二指示信息，所述第二指示信息用于指示当前条件支持为所述终端装置建立第一网络的会话；所述终端装置接收所述终端装置的第一会话的第一服务质量QoS控制信息，其中，所述第一会话为所述终端装置通过第二网络建立的会话。
在本申请实施例中，终端装置向第二网元发送第二指示信息，以指示当前条件支持为终端装置建立第一网络的会话，以便于第二网元根据第二指示信息确定第一指示信息，从而能够使网络侧根据当前条件确定建立第一会话的第一网络的会话，避免了建立不必要的第一网络的会话，提高了通信效率。
在一种可能的实现方式中，所述第二指示信息包括第一信息，所述第一信息用于指示所述当前条件为所述第二网络的移动性管理实体与所述第一网络的移动性管理实体之间存在通信接口。
在一种可能的实现方式中，所述第一信息包括所述终端装置的所述第一网络的默认承载标识。
在一种可能的实现方式中，所述第二指示信息还包括第二信息，所述第二信息用于指示所述当前条件为所述终端装置为单注册态。
在一种可能的实现方式中，所述第一QoS控制信息包括以下至少一个：QoS参数、QoS参数的标识、包过滤器、包过滤器的优先级信息。
在一种可能的实现方式中，所述第一QoS控制信息携带于第二会话管理消息中，所述第二会话管理消息用于指示修改或建立所述终端装置的第一网络中的QoS控制信息。
第四方面，提供了一种网元，包括：接收单元，用于从第二网元接收第一指示信息，所述第一指示信息用于指示当前条件支持为终端装置建立第一网络的会话；获取单元，用于在接收所述第一指示信息之后，获取所述终端装置的第一会话的第一服务质量QoS控制信息，其中，所述第一会话为所述终端装置通过第二网络建立的会话；发送单元，用于向所述第二网元发送所述第一QoS控制信息。
在一种可能的实现方式中，所述第一指示信息包括第一信息，所述第一信息用于指示所述当前条件为所述第二网络的移动性管理实体与所述第一网络的移动性管理实体之间存在通信接口。
在一种可能的实现方式中，所述第一信息包括所述终端装置的所述第一网络的默认承载标识。
在一种可能的实现方式中，所述第一指示信息还包括第二信息，所述第二信息用于指示所述当前条件为所述终端装置为单注册态。
在一种可能的实现方式中，所述获取单元还用于获取第三信息，所述第三信息用于指示所述第一会话的属性为保证连续性；在所述在接收所述第一指示信息之后，获取所述终端装置的第一QoS控制信息方面，所述获取单元具体用于在获取所述第一指示信息和所述第三信息之后，获取所述第一QoS控制信息。
在一种可能的实现方式中，在所述获取所述终端装置的第一QoS控制信息方面，所述获取单元具体用于向第三网元发送所述第一会话的签约数据获取请求消息，所述签约数据获取请求消息包括第四信息，所述第四信息用于请求提供所述第一网络的签约数据；以及从所述第三网元接收所述第一会话的签约数据响应消息，所述签约数据响应消息包括用于所述第一网络的第二QoS控制信息，其中为所述第四信息请求提供的所述第一网络的签约数据。
在一种可能的实现方式中，在所述根据所述第二QoS控制信息，获取所述第一QoS控制信息方面，所述获取单元具体用于将所述第二QoS控制信息确定为所述第一QoS控制信息；或，向策略控制网元发送所述第二QoS控制信息；以及从所述策略控制网元接收所述第一QoS控制信息，其中，所述第一QoS控制信息基于所述第二QoS控制信息，所述第一QoS控制信息为被所述策略控制网元授权的信息。。
在一种可能的实现方式中，所述第四信息包括所述第一网络的接入点名称APN。
在一种可能的实现方式中，在所述获取所述终端装置的第一QoS控制信息方面，所述获取单元具体用于从所述策略控制网元接收所述第一QoS控制信息，其中，所述第一QoS控制信息是所述策略控制网元授权的信息。
在一种可能的实现方式中，所述发送单元还用于向策略控制网元发送所述第一会话的建立请求消息，所述第一会话的建立请求消息包括第五信息，所述第五信息用于指示所述策略控制网元建立所述第一网络的会话；在所述从所述策略控制网元接收所述第一QoS控制信息方面，所述获取单元具体用于从所述策略控制网元接收所述第一会话的建立响应消息，所述第一会话的建立响应消息包括所述第一QoS控制信息。
在一种可能的实现方式中，所述第一QoS控制信息包括以下至少一个：QoS参数、QoS参数的标识、包过滤器、包过滤器的优先级信息。
在一种可能的实现方式中，在从第二网元接收第一指示信息方面，所述接收单元具体用于从所述第二网元接收所述第一会话的管理请求消息，所述第一会话的管理请求消息包括所述第一指示信息。
在一种可能的实现方式中，所述第一QoS控制信息携带于第一会话管理消息中，所述第一会话管理消息用于指示修改或建立所述终端装置的第一网络中的QoS控制信息。
第五方面，提供了一种网元，包括：发送单元，用于向第一网元发送第一指示信息，所述第一指示信息用于指示当前条件支持为终端装置建立第一网络的会话；接收单元，用于从所述第一网元接收所述终端装置的第一会话的第一服务质量QoS控制信息，其中，所述第一会话为所述终端装置通过第二网络建立的会话。
在一种可能的实现方式中，所述接收单元还用于从终端装置接收第二指示信息，所述第二指示信息用于指示当前条件支持为终端装置建立第一网络的会话；所述网元还包括确定单元，所述确定单元用于根据所述第二指示信息，确定所述第一指示信息。
在一种可能的实现方式中，所述第一指示信息包括第一信息，所述第一信息用于指示所述当前条件为所述第二网络的移动性管理实体与所述第一网络的移动性管理实体之间存在通信接口。
在一种可能的实现方式中，所述第一信息包括所述终端装置的所述第一网络的默认承载标识。
在一种可能的实现方式中，所述第一指示信息还包括第二信息，所述第二信息用于指示所述当前条件为所述终端装置为单注册态。
在一种可能的实现方式中，所述第一QoS控制信息包括以下至少一个：QoS参数、QoS参数的标识、包过滤器、包过滤器的优先级信息。
在一种可能的实现方式中，，在所述向第一网元发送第一指示信息方面，所述发送单元具体用于向所述第一网元发送所述第一会话的管理请求消息，所述第一会话的管理请求消息包括所述第一指示信息。
在一种可能的实现方式中，所述第一QoS控制信息携带于第一会话管理消息中，所述第一会话管理消息用于指示修改或建立所述终端装置的第一网络中的QoS控制信息。
第六方面，提供了一种终端装置，包括：发送单元，用于向第二网元发送第二指示信息，所述第二指示信息用于指示当前条件支持为所述终端装置建立第一网络的会话；接收单元，用于接收所述终端装置的第一会话的第一服务质量QoS控制信息，其中，所述第一会话为所述终端装置通过第二网络建立的会话。
在一种可能的实现方式中，所述第二指示信息包括第一信息，所述第一信息用于指示所述当前条件为所述第二网络的移动性管理实体与所述第一网络的移动性管理实体之间 存在通信接口。
在一种可能的实现方式中，所述第一信息包括所述终端装置的所述第一网络的默认承载标识。
在一种可能的实现方式中，所述第二指示信息还包括第二信息，所述第二信息用于指示所述当前条件为所述终端装置为单注册态。
在一种可能的实现方式中，所述第一QoS控制信息包括以下至少一个：QoS参数、QoS参数的标识、包过滤器、包过滤器的优先级信息。
在一种可能的实现方式中，所述第一QoS控制信息携带于第二会话管理消息中，所述第二会话管理消息用于指示修改或建立所述终端装置的第一网络中的QoS控制信息。
第七方面，提供了一种通信***，该通信***包括上述第四方面、第五方面所述的网元，可选地，该通信***还可以包括上述第六方面所述的终端装置。
第八方面，提供了一种网元，该网元包括：通信接口、存储器、处理器和总线***。其中，该通信接口、该存储器和该处理器通过该总线***相连，该存储器用于存储指令，该处理器用于执行该存储器存储的指令，以控制该通信接口接收信号和/或发送信号，并且当该处理器执行该存储器存储的指令时，该执行使得该处理器执行第一方面或第一方面的任意可能的实现方式中的方法。
第九方面，提供了一种网元，该网元包括：通信接口、存储器、处理器和总线***。其中，该通信接口、该存储器和该处理器通过该总线***相连，该存储器用于存储指令，该处理器用于执行该存储器存储的指令，以控制该通信接口接收信号和/或发送信号，并且当该处理器执行该存储器存储的指令时，该执行使得该处理器执行第二方面或第二方面的任意可能的实现方式中的方法。
第十方面，提供了一种终端装置，该终端装置包括：通信接口、存储器、处理器和总线***。其中，该通信接口、该存储器和该处理器通过该总线***相连，该存储器用于存储指令，该处理器用于执行该存储器存储的指令，以控制该通信接口接收信号和/或发送信号，并且当该处理器执行该存储器存储的指令时，该执行使得该处理器执行第三方面或第三方面的任意可能的实现方式中的方法。
第十一方面，提供了一种通信***，该通信***包括上述第八方面、第九方面所述的网元，可选地，该通信***还可以包括上述第十方面所述的终端装置。
第十二方面，提供了一种计算机可读介质，用于存储计算机程序，该计算机程序包括用于执行第一方面或第一方面的任意可能的实现方式中的方法的指令。
第十三方面，提供了一种计算机可读介质，用于存储计算机程序，该计算机程序包括用于执行第二方面或第二方面的任意可能的实现方式中的方法的指令。
第十四方面，提供了一种计算机可读介质，用于存储计算机程序，该计算机程序包括用于执行第三方面或第三方面的任意可能的实现方式中的方法的指令。
附图说明
图1是本申请实施例的可能的应用环境的示意图。
图2是本申请又一实施例的可能的应用环境的示意图。
图3是本申请又一实施例的可能的应用环境的示意图。
图4是本申请实施例的通信方法的流程示意图。
图5是本申请另一实施例的通信方法的交互示意图。
图6是本申请另一实施例的通信方法的交互示意图。
图7是本申请另一实施例的通信方法的交互示意图。
图8是本申请另一实施例的通信方法的交互示意图。
图9是本申请实施例的网元的结构示意图。
图10是本申请另一实施例的网元的结构示意图。
图11是本申请实施例的终端装置的结构示意图。
图12是本申请另一实施例的网元的结构示意图。
图13是本申请另一实施例的网元的结构示意图。
图14是本申请另一实施例的终端装置的结构示意图。
具体实施方式
下面将结合附图，对本申请中的技术方案进行描述。
本申请实施例的技术方案可以应用于各种通信***，例如：全球移动通讯(Global System of Mobile communication，GSM)***、码分多址(Code Division Multiple Access，CDMA)***、宽带码分多址(Wideband Code Division Multiple Access，WCDMA)***、通用分组无线业务(General Packet Radio Service，GPRS)、长期演进(Long Term Evolution，LTE)***、LTE频分双工(Frequency Division Duplex，FDD)***、LTE时分双工(Time Division Duplex，TDD)、通用移动通信***(Universal Mobile Telecommunication System，UMTS)、全球互联微波接入(Worldwide Interoperability for Microwave Access，WiMAX)通信***、演进的分组***(Evolved Packet System,EPS)，未来的第五代(5th Generation，5G)***或新无线(New Radio，NR)等。
本申请实施例中的终端装置可以指用户设备、接入终端、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端、无线通信设备、用户代理或用户装置。终端装置还可以是蜂窝电话、无绳电话、会话启动协议(Session Initiation Protocol，SIP)电话、无线本地环路(Wireless Local Loop，WLL)站、个人数字处理(Personal Digital Assistant，PDA)、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备，未来5G网络中的终端装置或者未来演进的公用陆地移动通信网络(Public Land Mobile Network，PLMN)中的终端装置等，本申请实施例对此并不限定。
本申请实施例中的基站可以是用于与终端装置通信的设备，该基站可以是全球移动通讯(Global System of Mobile communication，GSM)***或码分多址(Code Division Multiple Access，CDMA)中的基站(Base Transceiver Station，BTS)，也可以是宽带码分多址(Wideband Code Division Multiple Access，WCDMA)***中的基站(NodeB，NB)，还可以是LTE***中的演进型基站(Evolutional NodeB，eNB或eNodeB)，还可以是云无线接入网络(Cloud Radio Access Network，CRAN)场景下的无线控制器等，本申请实施例并不限定。
本申请实施例中的网元可以包括5G***架构和/或4G***架构中的网络设备。其中4G***架构可以包括EPS***架构。例如，网元可以包括接入和移动性管理功能(Access and Mobility Management function,AMF)实体、移动管理实体(Mobility Management Entity,MME)、会话管理功能(Session Management function,SMF)实体、统一数据管理(Unified Data Management，UDM)、策略控制功能(Policy Control Function,PCF)实体、策略和计费规则功能(Policy and Charging Rule Function,PCRF)实体、分组数据网络(Packet Data Network,PDN)、分组数据单元(Packet Data Unit,PDU)、控制面网关(PDN Gateway-Control plane，PGW-C)、用户面网关(PDN Gateway-User plane，PGW-U)、归属签约用户服务器(home Subscriber Server,HSS)、应用功能实体(Application Function,AF)等。
为了便于理解，首先介绍本申请实施例涉及的相关术语。
服务质量(quality of service,QoS)流(flow)：5G***中最小的QoS转发处理粒度，映射到同一个QoS流的所有业务接收相同的转发处理，如丢包率，包延时预算等。不同的QoS转发处理需要不同的5G QoS流。
下文结合图1-图3，介绍本申请实施例的应用环境。图1-3分别是本申请实施例的可能的***架构100-300的示意图。其中，图1示出了在非漫游场景下的5G***与EPS***的互通架构100。图2示出了在本地疏导(local breakout)漫游场景下的5G***与EPS***的互通架构200。图3示出了在家乡路由或者归属地路由(home-routed)漫游场景下的5G***与EPS***的互通架构300。
在架构100-300中，为了支持5G***和EPS***的互通，引入了第一接口。上述第一接口是指5G***的移动性管理实体与EPS***的移动性管理实体之间的通信接口。其中，5G***的移动性管理实体可以是AMF，EPS***的移动性管理实体可以是MME。在本申请实施例中，上述第一接口可以用N26接口表示。在该***架构支持N26接口的情况下，该互通架构能够支持5G和EPS***之间切换。需要说明的是，在该互通架构中，对N26接口的支持是可选的，只有在支持N26接口的互通网络中才能使用切换的流程来保证业务的连续性。
具体地，架构100-300中，可以包括EPS***中的网元和5G***中的网元。架构100-300中的某些模块包含了有EPS***的网元和5G***中的网元的功能。例如，HSS+UDM模块、PCF+PDRF模块、SMF+PGW-C模块、UPF+PGW-U模块，下文介绍架构100-300中涉及的模块和通信接口。
UPF+PGW-U模块：用于用户数据的传输管理，互通架构中，该模块既能用于EPS的数据传输，又能提供5G的数据传输功能。
SMF+PGW-C模块：用于会话的建立、删除和修改管理，互通架构中，该模块既能提EPS的会话管理功能，又能提供5G的会话管理功能。
PCF+PCRF模块：用于策略和计费控制实体，互通架构中，该模块既能为终端装置提供EPS的策略和计费控制，又能提供5G的策略和计费控制。
HSS+UDM模块：用于存储用户的签约数据，互通架构中，该模块既存储有终端装置的EPS的签约信息，又存储有终端装置的5G的签约信息。
5G无线接入网(radio access network,RAN)：为终端装置提供无线空口接入核心网络，从而获取对应的业务。
应用功能：(Application Function,AF)，与核心网交互提供业务或者服务，支持接入能力开放功能，与策略架构交互，提供应用信息等。
N5接口：PCF与AF之间的接口，用于AF直接与PCF交互，传输业务相关的信息。
能力开放功能(Network Exposure Function,NEF)：安全的开放网络功能提供的业务(或者服务)和能力，支持AF通过NEF与内部网络的交互等。
Pnt接口：PCF与NEF之间的接口，用于NEF与PCF的交互。第三方的AF可以通过NEF与PCF进行交互。
演进的通用陆地无线接入网络(evolved universal terrestrial radio access network,E-UTRAN)：用于无线资源管理，为终端装置建立、修改或删除空口资源。为终端装置提供数据和信令的传输等。
AMF模块：用于用户的接入和移动性管理，主要包含用户的注册管理、可达性管理移动性管理、寻呼管理、接入认证和授权非接入层信令的加密和完整性保护等。
MME模块：用于用户的移动性管理。例如，主要包含用户的附着管理、可达性管理、移动性管理、寻呼管理、接入认证和授权非接入层信令的加密和完整性保护等。
SGW模块:用户面的网关，与E-UTRAN的用户面终结点。作为基站之间切换的本地移动锚点。管理数据包的路由和传输，添加传输层的包标签等。
S1-MME接口：MME和E-UTRAN之间的控制面接口。
S1-U接口：S-GW和E-UTRAN之间的用户面接口。
S5-U接口：SGW和PGW-U之间的用户面接口，用于传输UE的用户面数据。
S5-C接口：SGW和PGW-U之间的控制面管理接口，用于为UE建立SGW和PGW-U用户面连接。
S6a接口：MME与HSS之间的接口，用于获取用户的签约数据和为UE执行认证和授权功能。
S11接口：SGW和MME之间的接口，用于建立用户面的承载。
N1接口：UE和AMF之间的接口，用户非接入层的信令管理和传输。
N2接口：(R)AN和AMF之间的接口，用于信令的传输。
N3接口：UPF和(R)AN直接的接口，用于传输用户的数据。
N4接口：SMF和UPF之间的接口，用于建立用户面的传输通道。
N7接口：SMF和PCF之间的接口，用于策略控制和计费信息的制定和下发。
N8接口：AMF与UDM之间的接口，用于获取用户的移动性相关签约信息等。
N10接口：SMF和UDM之间的接口，用于获取用户的会话管理相关签约信息等。
N11接口：SMF和AMF之间的接口，用于会话管理信息的传输等。
N15接口：AMF和PCF之间的接口，用于获取接入和移动性相关的策略信息。
另外架构200中：
h-PCF+h-PCRF表示家乡网络或者归属网络中的支持互通的策略控制体，既支持提供4G的策略和计费控制等功能，又支持提供5G的策略和计费控制等功能。
S9/N15接口表示家乡网络或者归属网络中的PCF之间的接口。
在架构300中：
v-PCF+v-PCRF表示漫游网络或者拜访网络中的支持互通的策略控制体，既支持提供 4G的策略和计费控制等功能，又支持提供5G的策略和计费控制等功能。
v-SMF表示漫游网络中的SMF。
v-PCF表示漫游网络中的PCF。
另外，图2和图3中的HPLMN表示本地网络，VPLMN表示访问网络或漫游网络。例如，HPLMN表示(home)公共陆地移动网络(public land mobile network，HPLMN)，VPLMN表示访问(visit)或漫游PLMN。
可以理解的是，上述对各个模块的功能介绍仅仅是一些举例说明，各个模块还可以具有其他功能，本发明实施例并不限定。
在一些实施例中，在5G***与EPS***互操作的过程中，当终端装置处于空闲态时，终端装置可以采用跟踪区更新(Tracking area update,TAU)的方式接入EPS***。当终端装置处于连接态时，5G***和EPS***之间的切换流程主要包括以下两种方式：第一种，在5G***和EPS***互操作过程中，进行移动性管理/会话管理(Mobility Management/Session Management,MM/SM)上下文相互映射。第二种，支持EPS和5G切换过程中重建MM/SM上下文的方案。
在一些实施例中，5G***切换到EPS***的流程，具体包括：在5G网络中建立5G QoS流时，同时建立EPS QoS参数和EPS承载标识(identifier,ID)。上述建立EPS QoS参数和EPS承载标识，包括：建立与5G默认规则对应的QoS的默认EPS承载；进一步地，还可以包括：建立与5G保证比特速率(Guaranteed Bit Rate,GBR)QoS流对应的专有EPS承载。
本申请实施例基于5G***和EPS***的互通架构，提出了一种通信方法，可以根据网络需要，在建立5G***会话的同时，建立EPS***的会话，从而能够根据当前条件确定是否建立EPS会话，避免了建立不必要的EPS会话，提高了通信效率。
下面结合图4，介绍本申请实施例的通信方法。图4的方法400可以应用于图1-图3的任一架构中。或者，图4的方法也可以应用于其他相似的架构中。其中，第一网络可以包括EPS***网络或4G***网络，第二网络可以包括5G***网络。第一网元可以为SMF或具有SMF功能的实体。例如，可以是架构100-300中的SMF+PGW-C模块，第二网元可以为AMF或具有AMF功能的实体。第三网元可以是UDM或具有UDM功能的实体，例如可以是架构100-300中的HSS+UDM模块。策略控制网元可以是PCF或者具有PCF功能的实体，例如可以是架构100-300中的PCF+PCRF模块。方法400包括：
步骤401部分，第二网元向第一网元发送第一指示信息，相应地，所述第一网元从所述第二网元接收所述第一指示信息，所述第一指示信息用于指示当前条件支持为终端装置建立第一网络的会话。
在一些示例中，上述当前条件支持为终端装置建立第一网络的会话，可以包括：当前网络中的5G***与EPS***之间存在N26接口。或者说，5G***中的AMF与EPS***中的MME之间存在通信接口。另外，上述当前条件支持为终端装置建立第一网络的会话，还可以包括：所述终端装置为单注册态。
例如，第一指示信息可以包括第一信息，第一信息可以采用显式或隐式的方式指示当前条件支持为终端装置建立第一网络的会话。在显式的方式中，所述第一信息可以直接指示所述第二网络的移动性管理实体与所述第一网络的移动性管理实体有通信接口。例如， 所述第一信息用于指示当前网络支持AMF与MME之间的N26接口，或者指示5G网络支持与4G网络互通。在隐式的方式中，第一信息可以为所述终端装置的第一网络的默认承载标识，可以采用所述终端装置的第一网络的承载标识隐式指示当前条件支持为终端装置建立第一网络的会话。上述第一网络的承载标识可以是第一网络的专用承载标识，也可以是第一网络的默认承载标识。例如，第一网络的默认承载标识可以为所述终端装置的EPS默认承载标识，第一网络的专用承载标识可以为所述终端装置的EPS专用承载标识。
在本申请实施例中，第一网元根据第一指示信息包括的第一信息，确定需要获取第一网络的终端装置的第一会话的第一服务质量QoS控制信息，从而根据第一指示信息确定建立第一网络的会话，避免了建立不必要的第一网络会话，提高了通信效率。
在本申请实施例中，通过在第一信息中携带终端装置的第一网络的默认承载标识，以隐式指示第一信息的内容，从而节约了开销。
在前文中提到上述当前条件支持为终端装置建立第一网络的会话，还可以包括：所述终端装置为单注册态。其中，若终端装置为单注册态，表示在同一时间所述终端装置只能在第一网络或第二网络中的其中一个网络注册，例如，只能在5G***中注册或只能在EPS***中注册。若终端装置为双注册态，表示所述终端装置可以同时在第一网络和第二网络中注册，例如，可以同时在5G网络和EPS网络中注册。若当前网络支持N26接口，且终端装置为单注册态，则第一网元确定需要为终端装置建立第一网络的会话。若终端装置为双注册态，即终端装置同时与第一网络和第二网络建立上下文，在任意时刻终端装置可以选择任意一个网络进行业务传输，例如，终端装置同时在5G***和EPS***中建立上下文。
在上述情况下，第一指示信息还可以包括第二信息，所述第二信息用于指示终端装置为单注册态。
在本申请实施例中，第一指示信息包括第一信息和第二信息，可以在满足第一指示信息指示的条件的情况下，在建立第一会话的第二网络会话的同时，建立第一会话的第一网络的会话，避免了建立不必要的第一网络的会话，提高了通信效率。
在一些示例中，所述第一网元从第二网元接收第一指示信息，可以包括：所述第一网元从第二网元接收所述第一会话的管理请求消息，所述第一会话的管理请求消息包括所述第一指示信息。
上述第一会话的管理请求消息可以包括多种类型。例如，第一会话的管理请求消息可以包括以下任意一种：第一会话的会话建立请求(PDU session establishment request)消息、第一会话的修改请求消息(PDU session modification request)。进一步的，上述第一会话的管理请求消息可以是服务化接口的服务请求，如Namf通信(communication)、Nsmf_PDU会话服务。其中，Namf是指AMF提供的服务，其中包含SMF提供的通信或会话管理，即服务。
步骤402部分，在接收所述第一指示信息之后，所述第一网元获取所述终端装置的第一会话的第一QoS控制信息，其中，所述第一会话为所述终端装置通过第二网络建立的会话。
其中，上述所述第一QoS控制信息可以用于控制所述第一网络中传输的业务的服务质量。换句话说，上述第一QoS控制信息可以是与第一网络中传输的业务的服务质量相 关的控制信息。例如，所述第一QoS控制信息可以包括以下至少一项：QoS参数、QoS参数的标识、包过滤器、包过滤器的优先级信息。
可选地，第一网元在获取第一指示信息之后，可以根据第一指示信息，确定是否需要为终端装置建立第一网络的会话。例如，第一网元在接收到第一指示信息之后，可以直接确定需要为终端装置建立第一网络的会话。或者，第一网元在接收到第一指示信息之后，可以综合第一指示信息和其他信息，确定是否需要为终端装置建立第一网络的会话。例如，上述其他信息可以是下述第三信息。
可选地，方法400还包括：所述第一网元获取第三信息，所述第三信息用于指示所述第一会话的属性为保证连续性。其中，上述第三信息可以是第一会话的会话连续性模式信息或第一会话的业务与会话连续性模式(service and session continuity mode,SSC_mode)信息。
可选地，上述第三信息可以指示该第一会话的属性为保证连续性或者指示该第一会话的属性为无需保证连续性。在一些示例中，第一网元自身存储有第三信息，或者第一网元可以从UDM获取签约数据，上述从UDM获取的签约数据中可以包括该第三信息。例如，第三信息可以是SSC_mode信息。第一网元从UDM获取第一会话的SSC_mode信息，若SSC_mode指示会话模式为第一模式，则可以表示第一会话为保证连续性。若SSC_mode指示会话模式为第二模式，则可以表示第一会话为无需保证连续性
在一些示例中，第一网元在获取第一指示信息之后，还可以进一步确定所述第一会话的属性是否为保证连续性。若所述第一会话的属性为保证连续性，则第一网元可以确定需要为终端装置建立第一网络的会话。若所述第一会话的属性为无需保证连续性，则第一网元可以确定无需为终端装置建立第一网络的会话。
在本申请实施例中，可以在满足第一指示信息指示的网络需要以及第三信息指示的条件的情况下，在建立第一会话的第二网络会话的同时，建立第一会话的第一网络的会话，避免了建立不必要的第一网络的会话，提高了通信效率。在第三信息指示第一会话的属性为无需保证连续性的情况下，第一网元无需为终端装置建立第一网络的会话，节约了通信资源。
在第一网元根据第一指示信息，确定需要为所述终端装置建立第一网络的会话之后，所述第一网元可以获取所述终端装置的第一QoS控制信息。例如，所述第一QoS控制信息是EPS***中传输的业务的QoS控制信息。其中，所述第一QoS控制信息可以包括以下至少一项：QoS参数、QoS参数的标识、包过滤器、包过滤器的优先级信息。例如，所述第一QoS控制信息中的QoS参数可以是终端装置的EPS默认承载的QoS参数，也可以是终端装置的EPS专用承载的QoS参数，包过滤器和包过滤器的优先级信息为EPS承载对应的业务流模板(Traffic Flow Template，TFT)，业务流模板包含至少一个包过滤器。
所述第一网元获取所述终端装置的第一QoS控制信息可以至少包括两种方式。
在第一种方式中，所述第一网元可以从第三网元获取第二QoS控制信息，并根据所述第二QoS控制信息，确定第一QoS控制信息。第一网元可以采用两种途径确定第一QoS控制信息。在第一种途径中，第一网元可以不对所述第二QoS控制信息进行修改，将所述第二QoS控制信息确定为所述第一QoS控制信息。在第二种途径中，第一网元可以向策略控制网元发送所述第二QoS控制信息，策略控制网元在接收所述第二QoS控制信息 之后，可以根据所述第二QoS控制信息确定第一QoS控制信息，所述第一QoS控制信息是策略控制单元授权的信息。所述策略控制网元可以修改所述第二QoS控制信息，以得到所述授权的第一QoS控制信息。或者，策略控制网元可以不修改所述第二QoS控制信息，以得到授权的第一QoS控制信息。策略控制网元可以向第一网元发送所述授权的第一QoS控制信息。
在第二种方式中，所述第一网元可以从策略控制网元接收所述第一QoS控制信息，其中，所述第一QoS控制信息是所述策略控制网元授权的信息。策略控制网元可以采用两种途径获取第一QoS控制信息。在第一种途径中，策略控制网元可以生成该第一QoS控制信息。在第二种途径中，策略控制网元可以从第四网元获取签约的第三QoS控制信息，所述策略控制网元可以根据所述第三QoS控制信息，确定所述第一QoS控制信息。具体地，所述策略控制单元可以选择修改或不修改所述第三QoS控制信息，以得到所述第一QoS控制信息。
针对第一种方式，在一些示例中，所述第一网元向第三网元发送所述第一会话的签约数据获取请求消息，所述签约数据获取请求消息包括第四信息，所述第四信息用于请求提供所述第一网络的签约数据；所述第一网元从所述第三网元接收所述第一会话的签约数据响应消息，所述签约数据响应消息包括第二QoS控制信息，其中所述第二QoS控制信息是签约的；所述第一网元根据所述第二QoS控制信息，获取所述第一QoS控制信息。
在一些示例中，上述第四信息可以包括数据网名称(data network name,DNN)，并指示需要获取第一网络的签约数据。在另一些示例中，第四信息还可以包括第一网络的接入点名称(access point name,APN)，以指示需要获取第一网络的签约数据。
进一步地，所述第一网元根据所述第二QoS控制信息，获取所述第一QoS控制信息，可以包括：所述第一网元将所述第二QoS控制信息确定为所述第一QoS控制信息；或，所述第一网元向策略控制网元发送所述第二QoS控制信息；所述第一网元从所述策略控制网元接收所述第一QoS控制信息，其中，所述第一QoS控制信息基于所述第二QoS控制信息，所述第一QoS控制信息为被所述策略控制网元授权的信息。。
针对第二种方式，在一些示例中，方法400还包括：所述第一网元向策略控制网元发送所述第一会话的建立请求消息，所述第一会话的建立请求消息包括第五信息，所述第五信息用于指示所述策略控制网元建立所述第一网络的会话；所述第一网元从所述策略控制网元接收所述第一QoS控制信息，包括：所述第一网元从所述策略控制网元接收所述第一会话的建立响应消息，所述第一会话的建立响应消息包括所述第一QoS控制信息。
步骤403部分，所述第一网元向所述第二网元发送所述第一QoS控制信息，相应地，所述第二网元从所述第一网元接收所述第一QoS控制信息。
在一些示例中，上述第一QoS控制信息可以携带于第一会话管理消息中，所述第一会话管理消息可以用于指示修改或建立所述终端装置的第一网络中的QoS控制信息。
例如，上述第一会话管理消息可以包括多种类型，例如，上述第一会话管理消息可以包括以下任意一项：会话建立(session establishment)消息、会话修改(session modification)消息。或者，上述第一会话管理消息可以是基于服务化接口的消息。
在本申请实施例中，基于第一网络和第二网络的互通架构，提出了一种通信方法，在支持第一指示信息指示的条件的情况下，可以既建立第一会话的第二网络会话，又建立第 一会话的第一网络的会话，从而能够根据当前条件确定建立第一会话的第一网络的会话，避免了建立不必要的第一网络的会话，提高了通信效率。
可选地，在步骤401部分之前，方法400还包括步骤404部分。
步骤404部分，所述终端装置向第二网元发送第二指示信息，相应地，所述第二网元接收所述第二指示信息，所述第二指示信息用于指示当前条件支持为所述终端装置建立第一网络的会话。
在步骤401部分之前，第二网元可以有至少两种途径确定第一指示信息。例如，在第一种途径中，第二网元可以从终端装置接收第二指示信息，并可以根据所述第二指示信息，确定第一指示信息。例如，第二网元通过第二指示信息，确定当前网络条件指示为所述终端装置建立第一网络的会话，则可以向第一网元发送第一指示信息，以指示当前条件支持为终端装置建立第一网络的会话。
其中，第二指示信息可以包括上述第一信息，进一步地，第二指示信息还可以包括上述第二信息。例如，终端装置可以在注册网络的过程中从第二网元获取第五信息，该第五信息用于指示第二网络的移动管理实体与第一网络的移动管理实体之间存在通信接口。并根据该第五信息确定上述第一信息。在第一种途径中，第一信息既可以是显式的也可以是隐式的。
在第二种途径中，第二网元可以自己生成第一指示信息。例如，第二网元可以自己获取第五信息，然后根据第五信息确定第一信息，并生成第一指示信息。进一步地，终端装置可以向第二网元发送上述第二信息，以便于第二网元在第一指示信息中添加第二信息。在第二种途径中，第一信息通常是显式的。
例如，第二网元可以是AMF。因此，第二网元是第二网络的移动性管理实体，第二网元可以确定所述第二网络的移动性管理实体与所述第一网络的移动性管理实体之间存在通信接口。从而在存在通信接口的情况下，第二网元可以生成第一指示信息。
可选地，在步骤403部分之后，第二网元在获取所述第一QoS控制信息之后，所述第二网元可以向基站发送所述第一QoS控制信息，所述基站在接收所述第一QoS控制信息之后，可以向所述终端装置发送所述第一QoS控制信息。在这种情况下，方法400还包括步骤405部分。
步骤405部分，所述第二网元通过基站向所述终端装置发送所述第一QoS控制信息，相应地，所述终端装置接收所述终端装置的第一会话的第一QoS控制信息。其中，所述第一会话为所述终端装置通过第二网络建立的会话。
其中，上述所述第一QoS控制信息可以用于控制所述第一网络中传输的业务的服务质量。换句话说，上述第一QoS控制信息可以是与第一网络中传输的业务的服务质量相关的控制信息。例如，所述第一QoS控制信息可以包括以下至少一项：QoS参数、QoS参数的标识、包过滤器、包过滤器的优先级信息。
可选地，在步骤405部分，所述第一QoS控制信息可以携带于第二会话管理消息中，所述第二会话管理消息用于指示修改或建立所述终端装置的第一网络中的QoS控制信息。
所述第二会话管理消息可以包括多种类型。例如，所述第二会话管理消息可以包括以下至少一项：会话建立接受(PDU session establishment accept)消息、接入点专用资源建立(AN-specific resource steup)消息、会话修改(session modification)消息。进一步的， 上述消息可以为服务化接口的服务获取交互。
下文结合图5至图8，介绍本申请实施例的通信方法的具体例子。其中，图5和图6示出了会话建立过程的通信流程。图7示出了会话修改过程中的通信流程。图8示出了终端装置注册到网络的通信流程。图5中的第一指示信息根据终端装置发送的第二指示信息确定。图6中的第一指示信息由AMF生成。另外图5-图8中的(R)AN表示接入网(access network,AN)实体或无线接入网(radio access network,RAN)实体。例如，(R)AN可以包括基站。
下面参见图5，图5的方法可以应用于架构100-300。图5示出了第一指示信息根据第二指示信息确定的过程。图5的方法包括：
S501、终端装置在注册到网络的过程中获取第五信息，该第五信息用于指示第二网络的移动管理实体与第一网络的移动管理实体之间存在通信接口。
例如，上述第五信息可以指示AMF支持N26接口(即AMF与MME之间能够进行消息交互)或者AMF支持与4G互通。
S502、终端装置向AMF发送第一PDU会话建立请求，该第一PDU会话建立请求用于请求在5G***建立终端装置的第一会话。第一PDU会话建立请求包括第二指示信息。
其中，所述第二指示信息的具体描述可以参见图4的相关内容。例如，第二指示信息可以包括第一信息，所述第一信息用于指示AMF支持N26接口或者AMF支持与4G互通。
例如，在隐式的指示方式中，所述第一信息可以为所述终端装置的EPS默认承载标识。例如，终端装置确定向网络发起会话请求时，若AMF支持N26接口，则可以确定分配EPS默认承载标识。
在显示的指示方式中，该第一信息可以用于直接指示所述AMF与EPS***的MME之间存在N26接口。
其中，可以根据S501中的第五信息确定上述第一信息。
进一步地，所述第二指示信息还可以包括第二信息，所述第二信息用于指示所述当前条件为所述终端装置处于单注册态。
进一步地，确定需要建立EPS会话的条件还可以包含：终端装置的第一会话的模式为保持连续性，或者，DNN指示的是一个语音网络或者其他需要保证会话连续性的网络。
进一步地，PDU会话建立请求消息中包含DNN，若终端装置上保存有DNN对应的EPS APN，则可选地，第一指示信息还可以包含EPS APN。
可选地，AMF可以获取用户EPS网络的签约的UE-AMBR。
可选地，AMF可以根据从终端装置接收的PDU会话建立请求，执行SMF选择。
S503、AMF根据所述第一PDU会话建立请求，向SMF+PGW-C发送第二PDU会话建立请求，所述第二PDU会话建立请求消息中包括第一指示信息。
可选地，AMF可以将所述第二指示信息确定为所述第一指示信息。该第一指示信息的具体描述可以参见图4中的相关内容。
可选地，所述第二PDU会话建立请求根据所述第一PDU会话请求生成。
该第一PDU的会话请求可以携带于第二会话建立请求消息之中。
可选地，第一指示信息还可以包括EPS APN。
S504、SMF+PGW-C向UDM+HSS发送签约数据获取请求，所述签约数据获取请求包括第四信息，所述第四信息用于请求提供所述第一网络的签约数据。
其中，关于第四信息的具体描述可以参见图4的例子中的相关内容。
例如，SMF+PGW-C接收到的PDU会话建立请求消息之后，若检测到PDU会话建立请求消息包括第一指示信息，则可以在向UDM+HSS发送的签约数据获取请求中添加第四信息。
第四信息中可以包含DNN/APN信息，以用于指示UDM+HSS在提供5G的签约数据时，同时提供EPS的签约数据。DNN/APN用于指示获取的是对应的DNN/APN的签约数据。
S505、UDM+HSS向SMF+PGW-C发送签约数据响应消息。上述签约数据响应消息包括第二QoS控制信息。
其中，上述签约数据响应消息和第二QoS控制信息的具体描述可以参见图4中的相关内容。
例如，上述第二QoS控制信息可以包括终端装置的EPS签约数据。EPS签约数据为某个对应DNN的特定APN的签约数据，包含EPS签约的QoS文本和签约的APN-AMBR。例如，上述EPS签约的QoS文本可以包括：QoS分类标识(QoS class identifier,QCI)，分配和预留优先级(Allocation and Retention Priority,ARP)。
S506、SMF+PGW-C向PCF+PCRF发送第三PDU会话建立请求。该第三PDU会话请求中包含第二QoS控制信息。
可选地，SMF+PGW-C可以执行PCF选择。在选择PCF之后，SMF+PGW-C向PCF+PCRF发送PDU会话建立请求。
S507、PCF+PCRF向SMF+PGW-C发送第三PDU会话建立响应，第三PDU会话建立响应对应于第三PDU会话请求，该第三PDU会话建立响应包括签约的第一QoS控制信息。
其中，该第一QoS控制信息是根据第二QoS控制信息确定的。关于第一QoS控制信息的具体内容可以参见图4中的相关内容，此处不再赘述。
例如，如果网络部署了动态PCC架构，该PDU会话建立响应可以包括授权的默认PCC规则。授权的默认PCC规则中包含授权的5G默认QoS规则以及EPS默认承载信息。上述签约的第一QoS控制信息可以包括上述EPS默认承载信息。
进一步地，在步骤S507中，PCF+PCRF确定需要为终端装置建立EPS***的会话。可以是根据接收到的SMF+PGW-C发送的指示信息。
可选地，第二QoS控制参数可以包括EPS默认承载QoS参数。SMF+PGW-C可以分配5G QoS流ID，并将5G QoS流ID和对应QoS流参数对应存储。进一步地，SMF+PGW-C可以存储对应的EPS默认承载信息。EPS默认承载信息可以包含默认EPS bearer ID，默认EPS QoS文本(profile)。例如，上述默认EPS QoS文本包括QCI或ARP。其中EPS默认承载信息和5G默认QoS flow相关信息可以对应存储。所述EPS默认承载信息，包含SMF+PGW-C根据从UDM+HSS获取并根据本地策略确定的EPS默认承载QoS参数；或者为SMF+PGW-C从PCF+PCRF获取的EPS默认承载QoS参数；
S508、SMF+PGW-C向UPF+PGW-U发送第四会话建立请求消息。
其中，该第四会话建立请求消息为N4接口的会话建立请求。N4接口为UPF+PGW-U与SMF+PGW-C之间的通信接口。
S509、UPF+PGW向SMF+PGW-C发送第四会话建立响应消息。
其中，该第四会话建立响应为N4接口的会话建立响应消息。
S510、SMF+PGW-C向AMF发送会话管理请求确定消息，会话管理请求确定消息中包含第二PDU会话建立响应消息，第二PDU会话建立响应消息中包含第一QoS控制信息。
该第一QoS控制信息例如可以包括EPS默认承载的QoS参数。进一步地，该第一QoS控制信息包含对应的EPS承载ID。
S511、AMF向5G AN发送第一PDU会话请求响应消息。第一PDU会话请求响应消息中包括第一QoS控制信息。
例如，上述第一QoS控制信息可以包含EPS默认承载的QoS参数。进一步地，第一QoS控制信息还可以包含对应EPS承载ID。
上述第一PDU会话请求消息为N2接口的PDU会话请求消息。N2接口为AMF与5G RAN之间的通信接口。
S512、可选地，AN向终端装置发送AN-专用资源建立消息，该AN-专用资源建立消息中包括第一QoS控制信息。
例如，AN和终端装置之间可以执行空口资源的建立流程，并在此流程中携带第一QoS控制信息。
S513、终端装置与网络设备进行上下行数据传输。
在图5的例子中，AMF根据终端装置发送的第二指示信息，确定并发送第一指示信息，以便于网络侧根据第一指示信息确定生成EPS***的会话，无需任意时刻都建立EPS***的会话，在一定条件下才发送预建立的流程，从而尽可能的减少***的开销。减少了任何时候都发起建立EPS***会话时造成的不必要的开销。
下面参见图6，图6的方法可以应用于架构100-300。图6示出了第一指示信息由AMF生成的过程。图6的方法包括：
S601、终端装置向AMF发送第一PDU会话建立请求，该第一PDU会话建立请求用于请求在5G***建立终端装置的第一会话。
例如，终端装置确定需要建立会话，终端装置向AMF向发送上述第一PDU会话建立请求。
S602、AMF根据所述第一PDU会话建立请求，向选择的SMF+PGW-C发送第二PDU会话建立请求，所述第二PDU会话建立请求消息中包括第一指示信息。
可选地，所述第二PDU会话建立请求根据所述第一PDU会话建立请求生成。
可选地，AMF生成第一指示信息，并将所述第一指示信息包含在第二PDU会话建立请求。
第一指示信息可以包括第一信息，该第一信息用于指示AMF支持N26接口信息或者AMF支持与4G互通。
例如，在隐式的指示方式中，所述第一信息可以为所述终端装置的EPS默认承载标识。例如，终端装置确定向网络发起会话请求时，若AMF支持N26接口，则可以确定分配 EPS默认承载标识。
在显示的指示方式中，该第一信息可以用于直接指示所述AMF与EPS***的MME之间存在N26接口。
例如，由于AMF自身可以确定第一信息，即N26的接口能力信息。因而，AMF可以根据第一信息生成第一指示信息，第一指示信息包括第一信息。进一步地，AMF可以从终端装置接收第二信息，即终端装置为单注册态的信息。从而AMF也可以在第一指示信息中添加上述第二信息。或者，可选的AMF根据自身支持N26接口的能力，终端装置为单注册态，确定包含指示信息，该指示信息用于指示会话管理功能建立EPS网络的会话，如EPS承载信息，包含QoS参数等信息。
S603、SMF+PGW-C向UDM+HSS发送签约数据获取请求，所述签约数据获取请求包括第四信息，所述第四信息用于请求提供所述第一网络的签约数据。
其中，关于第四信息的具体描述可以参见图4的例子中的相关内容。
例如，SMF+PGW-C接收到的PDU会话建立请求消息之后，若检测到PDU会话建立请求消息包括第一指示信息，则可以在向UDM+HSS发送的签约数据获取请求中添加第四信息。
第四信息中可以包含DNN/APN信息，以用于指示UDM+HSS在提供5G的签约数据时，同时提供EPS的签约数据。DNN/APN用于指示获取的是对应的DNN/APN的签约数据。
S604、UDM+HSS向SMF+PGW-C发送签约数据响应消息。上述签约数据响应消息包括第二QoS控制信息。
其中，上述签约数据响应消息和第二QoS控制信息的具体描述可以参见图4中的相关内容。
例如，上述第二QoS控制信息可以包括终端装置的EPS签约数据。EPS签约数据为某个对应DNN的特定APN的签约数据，包含EPS签约的QoS文本和签约的APN-AMBR。例如，上述EPS签约的QoS文本可以包括：QoS分类标识(QoS class identifier,QCI)，分配和预留优先级(Allocation and Retention Priority,ARP)。
S605、SMF+PGW-C向PCF+PCRF发送第三PDU会话建立请求。该第三PDU会话请求中包含第二QoS控制信息。
可选地，SMF+PGW-C可以执行PCF选择。在选择PCF之后，SMF+PGW-C向PCF+PCRF发送PDU会话建立请求。
S606、PCF+PCRF向SMF+PGW-C发送第三PDU会话建立响应，第三PDU会话建立响应对应于第三PDU会话请求，该第三PDU会话建立响应包括签约的第一QoS控制信息。
其中，该第一QoS控制信息是根据第二QoS控制信息确定的。关于第一QoS控制信息的具体内容可以参见图4中的相关内容，此处不再赘述。
例如，如果网络部署了动态PCC架构，该PDU会话建立响应可以包括授权的默认PCC规则。授权的默认PCC规则中包含授权的5G默认QoS规则以及EPS默认承载信息。上述签约的第一QoS控制信息可以包括上述EPS默认承载信息。
进一步地，在步骤S507中，PCF+PCRF确定需要为终端装置建立EPS***的会话。 可以是根据接收到的SMF+PGW-C发送的指示信息。
可选地，第二QoS控制参数可以包括EPS默认承载QoS参数。SMF+PGW-C可以分配5G QoS流ID，并将5G QoS流ID和对应QoS流参数对应存储。进一步地，SMF+PGW-C可以存储对应的EPS默认承载信息。EPS默认承载信息可以包含默认EPS bearer ID，默认EPS QoS规则。其中EPS默认承载信息和5G默认QoS flow可以对应存储。所述EPS默认承载信息，包含SMF+PGW-C根据从UDM+HSS获取并根据本地策略确定的EPS默认承载QoS参数；或者为SMF+PGW-C从PCF+PCRF获取的EPS默认承载QoS参数；
S607、SMF+PGW-C向UPF+PGW-U发送第四会话建立请求消息。
其中，该第四会话建立请求消息为N4接口的会话建立请求。N4接口为UPF+PGW-U与SMF+PGW-C之间的通信接口。
S608、UPF+PGW向SMF+PGW-C发送第四会话建立响应消息。
其中，该第四会话建立响应为N4接口的会话建立响应消息。
S609、SMF+PGW-C向AMF发送会话管理请求确定消息，会话管理请求确定消息中包含第二PDU会话建立响应消息，第二PDU会话建立响应消息中包含第一QoS控制信息。
该第一QoS控制信息例如可以包括EPS默认承载的QoS参数。进一步地，该第一QoS控制信息包含对应的EPS承载ID。可选地，该QoS控制信息还可以包括TFT信息。
S610、AMF向5G AN发送第一PDU会话请求响应消息。第一PDU会话请求响应消息中包括第一QoS控制信息。
例如，上述第一QoS控制信息可以包含EPS默认承载的QoS参数。进一步地，第一QoS控制信息还可以包含对应EPS承载ID。
上述第一PDU会话请求消息为N2接口的PDU会话请求消息。N2接口为AMF与5G RAN之间的通信接口。
可选地，在S610中，还包括：终端装置分配默认EPS承载标识。
S611、可选地，AN向终端装置发送AN-专用资源建立消息，该AN-专用资源建立消息中包括第一QoS控制信息。
例如，AN和终端装置之间可以执行空口资源的建立流程，并在此流程中携带第一QoS控制信息。
S612、终端装置与网络设备进行上下行传输。
在本申请实施例中，AMF自主生成第一指示信息，以便于网络侧根据第一指示信息确定生成EPS***的会话，无需任意时刻都建立EPS***的会话，在一定条件下才发送预建立的流程，从而尽可能的减少***的开销。减少了任何时候都发起建立时造成的不必要的开销。
下面参见图7，图7的方法可以应用于架构100-300。图7示出了会话修改的通信流程。其中，S701、S702、S703为三个并列的步骤，在执行时，可以执行S701、S702、S703中的任意一个步骤。在图7中，第一QoS控制信息可以包括建立或者修改的EPS承载信息。图7的方法包括：
S701、终端装置向AMF发送PDU会话修改请求，进一步地，AMF在接收该PDU修改请求之后，向SMF+PGW-C发送该PDU会话修改请求。该PDU会话修改请求用于指 示修改5G的QoS参数，同时指示修改EPS会话承载参数。
例如，当终端装置确定需要修改现有的PDU会话时，终端装置向AMF发送PDU会话修改请求，AMF向SMF+PGW-C发送PDU会话修改请求。终端装置可以使用该流程修改现有的QoS资源、或删除已经建立的QoS资源或者删除QoS资源上的业务。
S702、AF向PCF+PCRF发送会话建立请求，并同时建立EPS会话承载。
所述会话建立请求为N5接口的会话建立请求。所述N5接口为AF与PCF+PCRF之间的通信接口。
例如，AF可以主动向网络请求为业务建立资源，当需要时，向确定需要向PCF+PCRF发起N5会话建立流程，提供业务信息和业务的QoS需求。PCF+PCRF根据接收到N5会话请求时，根据之前的SMF请求业务发送的指示确定，在确定5G的QoS规则时，同时建立EPS的QoS规则，并向SMF+PGW-C发送包含确定的5G QoS规则和EPS QoS规则的PDU-CAN修改请求。
S703、SMF+PGW-C确定需要修改5G QoS流的QoS参数，并确定需要修改EPS承载的QoS参数。
例如，SMF+PGW-C根据本地策略确定修改5G QoS flow的QoS参数，根据会话建立过程中收到的第一指示信息确定同时修改EPS承载的QoS参数。
S704、SMF+PGW-C与PCF+PCRF之间执行PDU会话修改流程。
其中，PDU会话修改流程与PDU会话建立流程相似，可以参见图5中的S506-S507，图6中的S605-S606的相关内容。
S705、SMF+PGW-C存储或更新EPS承载的QoS参数。
例如，若终端装置和网络侧发起的会话修改流程用于修改现有的5G QoS流的参数，SMF+PGW-C保存更新的新的5G QoS流参数，同时保存对应的EPS承载的QoS参数。若终端装置和网络发起会话修改时新建一个5G QoS流，则网络确定建立专有EPS承载，SMF在+PGW-C保存新的5G QoS流信息时，同时对应保存建立的专有EPS承载。
S706、SMF+PGW-C向AMF发送PDU会话修改请求，该PDU会话修改请求包含建立或者修改的EPS承载信息。
例如，SMF+PGW-C向AMF发送的会话管理请求，会话管理请求包含PDU会话修改请求，该PDU会话修改请求包含建立或者修改的EPS承载信息。
S707、AMF向(R)AN发送PDU会话请求，PDU会话请求中包含建立或者修改的EPS承载信息。
其中，S707中的PDU会话请求为N2接口的PDU会话请求。N2接口为AMF和AN之间的通信接口。
S708、AN向终端装置发送AN专用资源修改消息，所述AN专用资源修改消息包括建立或者修改的EPS承载信息。
例如，终端装置和AN之间执行建立AN专用资源修改流程，在流程中AN向终端装置发送建立或者修改的EPS承载信息。若终端装置确定为新建EPS承载信息，则为该承载信息分配EPS承载标识。
S709、AN向AMF发送PDU会话请求确认消息。
其中，S709中的PDU会话请求确认消息为N2接口的PDU会话请求确认消息。
例如，AN向AMF发送N2PDU会话请求确认，若终端装置分配了EPS承载标识，则PDU会话请求确认消息可以包含EPS承载标识。
S710、AMF向SMF+PGW-C发送会话权利请求。
可选地，若终端装置分配了EPS承载标识，会话权利请求中包含EPS承载标识。
在本申请实施例中，修改现有5G会话的过程中，能够根据网络需要修改EPS***的承载参数。换句话说，只有符合特定条件，***才会在修改5G会话的过程中，同时修改和建立EPS***的承载参数，从而避免了不必要的开销，提高了通信效率。
在图5-图7的示例中，终端装置接入5G网络并与5G网络建立会话或者建立专有的QoS流时，网络侧可以根据网络是否支持N26接口、终端装置的注册模式和会话的模式确定是否建立EPS***的会话。例如，在会话建立过程中，SMF根据接收到的第四信息确定从UDM+HSS中获取5G会话的签约的上下文的同时获取EPS***的签约的PDN上下文，PDN上下文包括第一QoS控制信息，例如EPS签约QoS规则(EPS subscribed QoS profile)，签约接入点名称聚合的最大比特率(subscribed access point name aggregate maximum bit rate,subscribed APN-AMBR)等。SMF+PGW-C提供授权的默认5G QoS规则和授权的EPS默认承载信息给终端装置。当部署策略和计费控制(policy and charging control,PCC)时，SMF+PGW-C与PCF交互获取授权的默认5G QoS规则和授权的EPS默认承载信息。否则SMF可以根据本地策略执行授权。
可选地，在网络发起的专有承载建立或者终端装置发起的专有承载过程中，PCF/SMF+PGW-C根据指示信息在确定5G QoS规则的同时，确定EPS***的QoS规则。并由SMF+PGW-C确定是否建立新的EPS bearer承载上下文。当需要建立新的EPS bearer承载时，向终端装置发送EPS bearer信息并接收终端装置分配的EPS bearer ID。
可选地，当删除或修改某个QoS流时,网络侧可以同步修改或者删除对应的EPS bearer信息。
下面参见图8，图8的方法可以应用于架构100-300。图8示出了终端装置注册到网络的通信流程，并示出了终端装置在注册到网络时获取第五信息的过程，图8的方法包括：
S801、终端装置向(R)AN发送注册请求(register request)，相应地，(R)AN接收注册请求。
S802、(R)AN向AMF发送上述注册请求。
例如，(R)AN可以进行AMF选择，并向选择的AMF发送上述注册请求。
S803、AMF通过(R)AN向终端装置发送注册接受(register accept)消息，上述注册接受消息中包括第五信息。
关于第五信息的具体内容可以参考图4中的相关描述。例如，第五信息可以用于指示所述第二网络的移动性管理实体与所述第一网络的移动性管理实体有通信接口。例如，所述第五信息用于指示当前网络支持AMF与MME之间的N26接口。
在本申请实施例中，AMF向终端装置发送注册接受消息时携带第五信息，第五信息用于指示所述第二网络的移动性管理实体与所述第一网络的移动性管理实体有通信接口。以便于根据第五信息进行通信，提高了通信效率。
上文结合图1至图8详细描述了本申请实施例的通信方法，下文将结合图9至图14详细描述本申请实施例的网元和终端装置。
图9是本申请实施例的网元900的示意性框图。应理解，网元900能够执行图1至图8的方法中由第一网元执行的各个步骤，为了避免重复，此处不再详述。网元900包括：接收单元910、获取单元920和发送单元930。
所述接收单元910，用于从第二网元接收第一指示信息，所述第一指示信息用于指示当前条件支持为终端装置建立第一网络的会话；
所述获取单元920，用于在接收所述第一指示信息之后，获取所述终端装置的第一会话的第一服务质量QoS控制信息，其中，所述第一会话为所述终端装置通过第二网络建立的会话；
所述发送单元930，用于向所述第二网元发送所述第一QoS控制信息。
图10是本申请实施例的网元1000的示意性框图。应理解，网元1000能够执行图1至图8的方法中由第二网元执行的各个步骤，为了避免重复，此处不再详述。网元1000包括：发送单元1010和接收单元1020。
所述发送单元1010，用于向第一网元发送第一指示信息，所述第一指示信息用于指示当前条件支持为终端装置建立第一网络的会话；
所述接收单元1020，用于从所述第一网元接收所述终端装置的第一会话的第一服务质量QoS控制信息，其中，所述第一会话为所述终端装置通过第二网络建立的会话。
图11是本申请实施例的终端装置1100的示意性框图。应理解，终端装置1100能够执行图1至图8的方法中由终端装置执行的各个步骤，为了避免重复，此处不再详述。终端装置1100包括：发送单元1110和接收单元1120。
所述发送单元1110，用于向第二终端装置发送第二指示信息，所述第二指示信息用于指示当前条件支持为所述终端装置建立第一网络的会话；
所述接收单元1120，用于接收所述终端装置的第一会话的第一服务质量QoS控制信息，其中，所述第一会话为所述终端装置通过第二网络建立的会话。
图12是本申请实施例的网元1200的示意性框图。应理解，网元1200能够执行图1至图8的方法中由第一网元执行的各个步骤，为了避免重复，此处不再详述。网元1200包括：
存储器1210，用于存储程序；
通信接口1220，用于和其他设备进行通信；
处理器1230，用于执行存储器1210中的程序，当所述程序被执行时，所述处理器1230用于通过所述通信接口1220从第二网元接收第一指示信息，所述第一指示信息用于指示当前条件支持为终端装置建立第一网络的会话；以及在接收所述第一指示信息之后，获取所述终端装置的第一会话的第一服务质量QoS控制信息，其中，所述第一会话为所述终端装置通过第二网络建立的会话；以及通过所述通信接口1220向所述第二网元发送所述第一QoS控制信息。
图13是本申请实施例的网元1300的示意性框图。应理解，网元1300能够执行图1至图8的方法中由第二网元执行的各个步骤，为了避免重复，此处不再详述。网元1300包括：
存储器1310，用于存储程序；
通信接口1320，用于和其他设备进行通信；
处理器1330，用于执行存储器1310中的程序，当所述程序被执行时，所述处理器1330用于通过所述通信接口1320向第一网元发送第一指示信息，所述第一指示信息用于指示当前条件支持为终端装置建立第一网络的会话；以及通过所述通信接口1320从所述第一网元接收所述终端装置的第一会话的第一服务质量QoS控制信息，其中，所述第一会话为所述终端装置通过第二网络建立的会话。
图14是本申请实施例的终端装置1400的示意性框图。应理解，终端装置1400能够执行图1至图8的方法中由终端装置执行的各个步骤，为了避免重复，此处不再详述。终端装置1400包括：
存储器1410，用于存储程序；
通信接口1420，用于和其他设备进行通信；
处理器1430，用于执行存储器1410中的程序，当所述程序被执行时，所述处理器1430用于通过所述通信接口1420向第二终端装置发送第二指示信息，所述第二指示信息用于指示当前条件支持为所述终端装置建立第一网络的会话；以及通过所述通信接口1420接收所述终端装置的第一会话的第一服务质量QoS控制信息，其中，所述第一会话为所述终端装置通过第二网络建立的会话。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的***、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的***、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个***，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网元等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(Read-Only Memory,ROM))、随机存 取存储器(Random Access Memory,RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (35)

  1. 一种通信方法，其特征在于，包括：
    第一网元从第二网元接收第一指示信息，所述第一指示信息用于指示当前条件支持为终端装置建立第一网络的会话；
    在接收所述第一指示信息之后，所述第一网元获取所述终端装置的第一会话的第一服务质量QoS控制信息，其中，所述第一会话为所述终端装置通过第二网络建立的会话；
    所述第一网元向所述第二网元发送所述第一QoS控制信息。
  2. 如权利要求1所述的通信方法，其特征在于，所述第一指示信息包括第一信息，所述第一信息用于指示所述当前条件为所述第二网络的移动性管理实体与所述第一网络的移动性管理实体之间存在通信接口。
  3. 如权利要求2所述的通信方法，其特征在于，所述第一信息包括所述终端装置的所述第一网络的默认承载标识。
  4. 如权利要求1至3中任一项所述的通信方法，其特征在于，所述第一指示信息还包括第二信息，所述第二信息用于指示所述当前条件为所述终端装置为单注册态。
  5. 如权利要求1至4中任一项所述的通信方法，其特征在于，所述方法还包括：
    所述第一网元获取第三信息，所述第三信息用于指示所述第一会话的属性为保证连续性；
    在获取所述第一指示信息和所述第三信息之后，所述第一网元获取所述第一QoS控制信息。
  6. 如权利要求1至5中任一项所述的通信方法，其特征在于，所述第一网元获取所述终端装置的第一QoS控制信息，包括：
    所述第一网元向第三网元发送所述第一会话的签约数据获取请求消息，所述签约数据获取请求消息包括第四信息，所述第四信息用于请求提供所述第一网络的签约数据；
    所述第一网元从所述第三网元接收所述第一会话的签约数据响应消息，所述签约数据响应消息包括第二QoS控制信息，其中所述第二QoS控制信息为所述第四信息请求提供的所述第一网络的签约数据；
    所述第一网元根据所述第二QoS控制信息，获取所述第一QoS控制信息。
  7. 如权利要求6所述的通信方法，其特征在于，所述第一网元根据所述第二QoS控制信息，获取所述第一QoS控制信息，包括：
    所述第一网元将所述第二QoS控制信息确定为所述第一QoS控制信息；或，
    所述第一网元向策略控制网元发送所述第二QoS控制信息；
    所述第一网元从所述策略控制网元接收所述第一QoS控制信息，其中，所述第一QoS控制信息基于所述第二QoS控制信息，所述第一QoS控制信息为被所述策略控制网元授权的信息。
  8. 如权利要求6或7所述的通信方法，其特征在于，所述第四信息包括所述第一网络的接入点名称APN。
  9. 如权利要求1至5中任一项所述的通信方法，其特征在于，所述第一网元获取所 述终端装置的第一QoS控制信息，包括：
    所述第一网元从所述策略控制网元接收所述第一QoS控制信息，其中，所述第一QoS控制信息是所述策略控制网元授权的信息。
  10. 如权利要求9所述的通信方法，其特征在于，所述方法还包括：所述第一网元向策略控制网元发送所述第一会话的建立请求消息，所述第一会话的建立请求消息包括第五信息，所述第五信息用于指示所述策略控制网元建立所述第一网络的会话；
    所述第一网元从所述策略控制网元接收所述第一QoS控制信息，包括：
    所述第一网元从所述策略控制网元接收所述第一会话的建立响应消息，所述第一会话的建立响应消息包括所述第一QoS控制信息。
  11. 如权利要求1至10中任一项所述的通信方法，其特征在于，所述第一QoS控制信息包括以下至少一个：
    QoS参数、QoS参数的标识、包过滤器、包过滤器的优先级信息。
  12. 根据权利要求1至11中任一项所述的通信方法，其特征在于，所述第一网元从第二网元接收第一指示信息，包括：
    所述第一网元从所述第二网元接收所述第一会话的管理请求消息，所述第一会话的管理请求消息包括所述第一指示信息。
  13. 如权利要求1至12中任一项所述的通信方法，其特征在于，所述第一QoS控制信息携带于第一会话管理消息中，所述第一会话管理消息用于指示修改或建立所述终端装置的第一网络中的QoS控制信息。
  14. 一种通信方法，其特征在于，包括：
    第二网元向第一网元发送第一指示信息，所述第一指示信息用于指示当前条件支持为终端装置建立第一网络的会话；
    所述第二网元从所述第一网元接收所述终端装置的第一会话的第一服务质量QoS控制信息，其中，所述第一会话为所述终端装置通过第二网络建立的会话。
  15. 如权利要求14所述的通信方法，其特征在于，所述方法还包括：
    所述第二网元从终端装置接收第二指示信息，所述第二指示信息用于指示当前条件支持为终端装置建立第一网络的会话；
    所述第二网元根据所述第二指示信息，确定所述第一指示信息。
  16. 如权利要求14或15所述的通信方法，其特征在于，所述第一指示信息包括第一信息，所述第一信息用于指示所述当前条件为所述第二网络的移动性管理实体与所述第一网络的移动性管理实体之间存在通信接口。
  17. 如权利要求16所述的通信方法，其特征在于，所述第一信息包括所述终端装置的所述第一网络的默认承载标识。
  18. 如权利要求14至17中任一项所述的通信方法，其特征在于，所述第一指示信息还包括第二信息，所述第二信息用于指示所述当前条件为所述终端装置为单注册态。
  19. 如权利要求14至18中任一项所述的通信方法，其特征在于，所述第一QoS控制信息包括以下至少一个：QoS参数、QoS参数的标识、包过滤器、包过滤器的优先级信息。
  20. 根据权利要求14至19中任一项所述的通信方法，其特征在于，所述第二网元向 第一网元发送第一指示信息，包括：
    所述第二网元向所述第一网元发送所述第一会话的管理请求消息，所述第一会话的管理请求消息包括所述第一指示信息。
  21. 如权利要求14至20中任一项所述的通信方法，其特征在于，所述第一QoS控制信息携带于第一会话管理消息中，所述第一会话管理消息用于指示修改或建立所述终端装置的第一网络中的QoS控制信息。
  22. 一种通信方法，其特征在于，包括：
    终端装置向第二网元发送第二指示信息，所述第二指示信息用于指示当前条件支持为所述终端装置建立第一网络的会话；
    所述终端装置接收所述终端装置的第一会话的第一服务质量QoS控制信息，其中，所述第一会话为所述终端装置通过第二网络建立的会话。
  23. 如权利要求22所述的通信方法，其特征在于，所述第二指示信息包括第一信息，所述第一信息用于指示所述当前条件为所述第二网络的移动性管理实体与所述第一网络的移动性管理实体之间存在通信接口。
  24. 如权利要求23所述的通信方法，其特征在于，所述第一信息包括所述终端装置的所述第一网络的默认承载标识。
  25. 如权利要求22至24中任一项所述的通信方法，其特征在于，所述第二指示信息还包括第二信息，所述第二信息用于指示所述当前条件为所述终端装置为单注册态。
  26. 如权利要求22至25中任一项所述的通信方法，其特征在于，所述第一QoS控制信息包括以下至少一个：
    QoS参数、QoS参数的标识、包过滤器、包过滤器的优先级信息。
  27. 如权利要求22至26中任一项所述的通信方法，其特征在于，所述第一QoS控制信息携带于第二会话管理消息中，所述第二会话管理消息用于指示修改或建立所述终端装置的第一网络中的QoS控制信息。
  28. 一种网元，其特征在于，包括：
    存储器，用于存储计算机指令；
    处理器，用于执行所述存储器中存储的计算机指令，当所述计算机指令被执行时，所述处理器用于执行如权利要求1-13中任一项所述方法。
  29. 一种网元，其特征在于，包括：
    存储器，用于存储计算机指令；
    处理器，用于执行所述存储器中存储的计算机指令，当所述计算机指令被执行时，所述处理器用于执行如权利要求14-21中任一项所述方法。
  30. 一种终端装置，其特征在于，包括：
    存储器，用于存储计算机指令；
    处理器，用于执行所述存储器中存储的计算机指令，当所述计算机指令被执行时，所述处理器用于执行如权利要求22-27中任一项所述方法。
  31. 一种通信***，其特征在于，包括：
    如权利要求1-13中任一项所述的网元以及如权利要求14-21中任一项所述的网元。
  32. 一种通信***，其特征在于，包括：
    如权利要求1-13中任一项所述的网元；
    如权利要求14-21中任一项所述的网元以及如权利要求22-27中任一项所述的终端装置。
  33. 一种计算机存储介质，其特征在于，包括计算机指令，当所述计算机指令在计算机上运行时，使得所述计算机执行如权利要求1-13中任一项所述的方法。
  34. 一种计算机存储介质，其特征在于，包括计算机指令，当所述计算机指令在计算机上运行时，使得所述计算机执行如权利要求14-21中任一项所述的方法。
  35. 一种计算机存储介质，其特征在于，包括计算机指令，当所述计算机指令在计算机上运行时，使得所述计算机执行如权利要求22-27中任一项所述的方法。
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