WO2021042381A1 - 一种通信方法、装置及系统 - Google Patents

一种通信方法、装置及系统 Download PDF

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Publication number
WO2021042381A1
WO2021042381A1 PCT/CN2019/104752 CN2019104752W WO2021042381A1 WO 2021042381 A1 WO2021042381 A1 WO 2021042381A1 CN 2019104752 W CN2019104752 W CN 2019104752W WO 2021042381 A1 WO2021042381 A1 WO 2021042381A1
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WIPO (PCT)
Prior art keywords
information
wireless access
qos flow
network device
service
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PCT/CN2019/104752
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English (en)
French (fr)
Inventor
吴义壮
李永翠
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华为技术有限公司
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2019/104752 priority Critical patent/WO2021042381A1/zh
Publication of WO2021042381A1 publication Critical patent/WO2021042381A1/zh

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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
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria

Definitions

  • This application relates to the field of mobile communication technology, and in particular to a communication method, device and system.
  • the terminal device can perform service transmission with the network side through the access network node, including uplink transmission and downlink transmission.
  • one access network node can use one or more different wireless access technologies.
  • the wireless access technology used by an access network node is generally pre-configured through pre-configuration, that is, the services on an access network node are all transmitted using the same wireless access technology.
  • the method is not flexible enough.
  • This application provides a communication method, device, and system to realize flexible selection of wireless access technologies for establishing QoS flows.
  • the present application provides a communication method, the method includes: a session management network element determines wireless access priority information of a QoS flow, and the wireless access priority information of the QoS flow is used to indicate the use of the QoS flow The priority of the wireless access technology; the session management network element sends the wireless access priority information of the QoS flow to the access network device, and the wireless access priority information of the QoS flow is used for the access
  • the network equipment determines the radio access technology used to establish the QoS flow.
  • the session management network element determines the wireless access priority information of the QoS flow, and then sends the wireless access priority information of the QoS flow to the access network device, so that the access network device can access the wireless access according to the QoS flow
  • the priority information determines the wireless access technology used to establish the QoS flow, and realizes the dynamic selection of the wireless access technology according to the wireless access priority information of the QoS flow, which is more flexible.
  • the session management network element determining the wireless access priority information of the QoS flow includes: the session management network element controls the wireless access priority information of the service received from the policy control network element To determine wireless access priority information of the QoS flow, where the QoS flow is used to transmit the service.
  • the session management network element receives first information from the access network device, where the first information indicates the access network downlink tunnel information, and the access network downlink tunnel information Used to indicate the downlink tunnel information corresponding to the QoS flow, where the access network downlink tunnel information is the downlink of the access network device corresponding to the preferred radio access technology indicated by the radio access priority information of the QoS flow Tunnel information; the session management network element sends the access network downlink tunnel information to the user plane network element.
  • the session management network element sends core network uplink tunnel information to the access network device.
  • the determination of the wireless access priority information of the QoS flow by the session management network element includes: the session management network element obtains second information, and the second information is the session information of the terminal device DNN, the QoS flow is the QoS flow of the session; the session management network element determines the wireless access priority information of the QoS flow according to the wireless access priority information corresponding to the second information.
  • the session management network element sending wireless access priority information of the QoS flow to the access network device includes: the session management network element sending N2 session management to the access network device Information, the N2 session management information includes wireless access priority information of the QoS flow.
  • the session management network element receives capability indication information from the access network device, and the capability indication information is used to indicate that dual connectivity is supported; the session management network element indicates the capability according to the capability indication information.
  • Information determining the wireless access priority information of the QoS flow to be sent to the access network device.
  • the present application provides a communication method.
  • the method includes: a session management network element receives service wireless access priority information from a policy control network element, and the service wireless access priority information is used to indicate the The priority of the wireless access technology used by the service; the session management network element determines third information according to the wireless access priority information of the service, and the third information is access network tunnel information or indication information, so The indication information is used to indicate the radio access technology information selected for use; the session management network element sends the third information to the first access network device.
  • the policy control network element determines the wireless access priority information of the service and sends it to the session management network element.
  • the session management network element determines the third information according to the wireless access priority information of the service and sends it to the first access network.
  • the device sends the third information, that is, the session management network element determines the specific wireless access technology to use or determines the selected access network tunnel information, which realizes the dynamic selection of the wireless access technology based on the wireless access priority information, so it is more flexible .
  • the first access network device is the main access network device, and the second access network device is the auxiliary access network device;
  • the third information is the first access technology Access network tunnel information of the network access device; or, when the wireless access technology of the service indicated by the wireless access priority information of the service is the wireless access technology corresponding to the second access network device , The third information is the access network tunnel information of the second access network device; or,
  • the third information is the indication information
  • the indication information is used to indicate that the selected radio access technology information is the radio access technology information corresponding to the first access network device; or, when the radio access priority information of the service indicates the service
  • the radio access technology to be used preferentially is the radio access technology corresponding to the second access network device
  • the third information is the indication information
  • the indication information is used to indicate that the selected radio access technology information is Radio access technology information corresponding to the second access network device.
  • the third information is the indication information .
  • the indication information is used to indicate that the selected radio access technology information is the radio access technology information corresponding to the first access network device;
  • the third information is the indication
  • the indication information is used to indicate that the radio access technology information selected for use is target radio access technology information, and the target radio access technology information is different from the radio access technology information corresponding to the first access network device. the same.
  • the information of the wireless access technology selected for use is the wireless access technology selected for use or path information corresponding to the wireless access technology selected for use.
  • the present application provides a communication method, the method includes: a first access network device determines wireless access priority information of a quality of service QoS flow, and the wireless access priority information of the QoS flow is used to indicate all The priority of the wireless access technology used by the QoS flow; the first access network device determines the wireless access technology used to establish the QoS flow according to the wireless access priority information of the QoS flow.
  • the first access network device determines the wireless access priority information of the QoS flow, and determines the wireless access technology used to transmit the QoS flow according to the wireless access priority information, thereby realizing wireless access based on the QoS flow
  • the priority information dynamically selects the wireless access technology, so it is more flexible.
  • the wireless access technology used by the QoS flow determined by the first access network device is the same as the wireless access technology corresponding to the first access network device, then the The first access network device determines that the first access network device establishes the QoS flow; or, the radio access technology used by the QoS flow determined by the first access network device is the same as the first If the wireless access technologies corresponding to the access network devices are not the same, the first access network device determines that the second access network device establishes the QoS flow; the first access network device and the second access network device The network access devices are respectively the main access network device and the auxiliary access network device in the dual-connection scenario.
  • the first access network device sends first information to the session management network element, where the first information indicates the access network downlink tunnel information, and the access network downlink tunnel information uses
  • the access network downlink tunnel information is the downlink tunnel of the access network device corresponding to the radio access technology indicated by the radio access priority information of the QoS flow information.
  • the first access network device receives core network uplink tunnel information from the session management network element.
  • the first access network device determining the wireless access priority information of the QoS flow includes: the first access network device receives the wireless access priority information of the QoS flow from the session management network element. Access priority information; or, the first access network device obtains the 5G QoS identifier 5QI or QoS attribute value of the QoS flow, and according to the radio access priority information corresponding to the 5QI or the QoS attribute value The corresponding wireless access priority information determines the wireless access priority information of the QoS flow.
  • the radio access technology used by the QoS flow is EUTRA or NR.
  • the present application provides a communication device, which may be a session management network element, or a chip used for a session management network element.
  • the device has the function of realizing the above-mentioned first aspect or each embodiment of the first aspect, the second aspect or each embodiment of the second aspect. This function can be realized by hardware, or by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the above-mentioned functions.
  • the present application provides a communication device, which may be an access network device or a chip for the access network device.
  • the device has the function of realizing the foregoing third aspect or the embodiments of the third aspect. This function can be realized by hardware, or by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the above-mentioned functions.
  • the present application provides a communication device including a processor and a memory; the memory is used to store computer-executable instructions, and when the device is running, the processor executes the computer-executable instructions stored in the memory to make the device Perform the method as described above in each aspect or each embodiment of each aspect.
  • the present application provides a communication device, which includes units or means for executing the above aspects or steps in each aspect.
  • the present application provides a communication device including a processor and an interface circuit, where the processor is configured to communicate with other devices through the interface circuit and execute the methods of the above aspects or the embodiments of the aspects.
  • the processor includes one or more.
  • the present application provides a communication device including a processor, configured to be connected to a memory, and configured to call a program stored in the memory to execute the methods of the above aspects or the embodiments of the aspects.
  • the memory can be located inside the device or outside the device.
  • the processor includes one or more.
  • this application also provides a computer-readable storage medium that stores instructions in the computer-readable storage medium, which when run on a computer, causes a processor to execute the above aspects or embodiments of each aspect The method described.
  • the present application also provides a computer program product including instructions, which when run on a computer, cause the computer to execute the methods described in the above aspects or the embodiments of the aspects.
  • the present application also provides a chip system, including a processor, configured to execute the methods described in the foregoing aspects or the embodiments of the aspects.
  • this application provides a communication system, including a session management network element and an access network device; the session management network element is used to determine the wireless access priority information of a QoS flow, and the wireless access of the QoS flow
  • the access priority information is used to indicate the priority of the wireless access technology used by the QoS flow; and, the wireless access priority information of the QoS flow is sent to the access network device; the access network device uses According to the wireless access priority information of the QoS flow, the wireless access technology used to establish the QoS flow is determined.
  • the present application provides a communication system, including a session management network element and a policy control network element; the policy control network element is used to send service wireless access priority information to the session management network element,
  • the wireless access priority information of the service is used to indicate the priority of the wireless access technology used by the service;
  • the session management network element is used to determine the third Information, the third information is access network tunnel information or indication information, the indication information is used to indicate the radio access technology information selected for use; and the third information is sent to the first access network device.
  • this application provides a communication system, including a session management network element and a first access network device; the first access network device is used to determine wireless access priority information of a QoS flow, and the QoS flow
  • the wireless access priority information is used to indicate the priority of the wireless access technology used by the QoS flow; and, according to the wireless access priority information of the QoS flow, the wireless access used to establish the QoS flow is determined Access technology; session management network element for receiving first information from the first access network device, where the first information indicates access network downlink tunnel information, and the access network downlink tunnel information is used to indicate all
  • the downlink tunnel information corresponding to the QoS flow, and the access network downlink tunnel information is the downlink tunnel information of the access network device corresponding to the preferred radio access technology indicated by the radio access priority information of the QoS flow.
  • the present application provides a communication method, including: a session management network element determines wireless access priority information of a QoS flow, and the wireless access priority information of the QoS flow is used to indicate the wireless access used by the service. Priority of the access technology; the session management network element sends the wireless access priority information of the QoS flow to the access network device, and the wireless access priority information of the QoS flow is used by the access network device to determine the establishment of the The wireless access technology used by the QoS flow; the access network device determines the wireless access technology used to establish the QoS flow according to the wireless access priority information of the QoS flow.
  • the present application provides a communication method, including: a session management network element receives service wireless access priority information from a policy control network element, and the wireless access priority information of the service is used to indicate the service The priority of the wireless access technology used; the session management network element determines third information according to the wireless access priority information of the service, and the third information is access network tunnel information or indication information, the The indication information is used to indicate the selected radio access technology; the session management network element sends the third information to the first access network device.
  • the access network device receives the third information from the session management network element.
  • the present application provides a communication method, including: a first access network device determines wireless access priority information of a QoS flow, and the wireless access priority information of the QoS flow is used to indicate the QoS flow The priority of the wireless access technology used; the first access network device determines the wireless access technology used to establish the QoS flow according to the wireless access priority information of the QoS flow; the session management network element obtains information from the The first access network device receives first information, the first information indicating access network downlink tunnel information, the access network downlink tunnel information is used to indicate the downlink tunnel information corresponding to the QoS flow, and the access The network downlink tunnel information is the downlink tunnel information of the access network device corresponding to the preferred radio access technology indicated by the radio access priority information of the QoS flow.
  • FIG. 1A is a schematic diagram of a communication system provided by this application.
  • FIG. 1B is a schematic diagram of another communication system provided by this application.
  • Figure 2A is a schematic diagram of a 5G network architecture based on a service-oriented architecture
  • Figure 2B is a schematic diagram of a 5G network architecture based on a point-to-point interface
  • Figure 3 shows the dual connectivity architecture defined by 3GPP
  • FIG. 4 is a schematic diagram of the process of the wireless network side when the SN is inserted in the prior art
  • FIG. 5 is a schematic diagram of a flow on the core network side when inserting an SN in the prior art
  • FIG. 6A is a schematic flowchart of a communication method provided by this application.
  • FIG. 6B is a schematic flow diagram of another communication method provided by this application.
  • FIG. 7 is a schematic flowchart of another communication method provided by this application.
  • FIG. 8 is a schematic flowchart of another communication method provided by this application.
  • FIG. 9 is a schematic flowchart of another communication method provided by this application.
  • FIG. 10 is a schematic flowchart of another communication method provided by this application.
  • FIG. 11 is a schematic diagram of a communication device provided by this application.
  • FIG. 12 is a schematic diagram of another communication device provided by this application.
  • the present application provides a communication system, which includes a session management network element and an access network device.
  • the system further includes a policy control network element.
  • the system of Figure 1A there are two solutions.
  • the session management network element is used to determine the wireless access priority information of a Quality of Service (QoS) flow, and the wireless access priority information of the QoS flow is used to indicate the wireless access used by the QoS flow. And, sending wireless access priority information of the QoS flow to the access network device; and the access network device is configured to determine the establishment of the wireless access priority information of the QoS flow according to the wireless access priority information of the QoS flow.
  • QoS Quality of Service
  • the policy control network element is used to receive service wireless access tendency information from the application function network element, and the wireless access tendency information is used to indicate the wireless access technology that the service tends to use The priority; according to the wireless access tendency information, determine the wireless access priority information of the service; or, according to the subscription information of the service and/or the service corresponding to different wireless access technologies
  • the service experience information is used to determine the wireless access priority information of the service;
  • the session management network element is used to determine the wireless access priority information of the QoS flow, including: The wireless access priority information of the service determines the wireless access priority information of the QoS flow, and the QoS flow is used to transmit the service.
  • the policy control network element is further configured to receive capability indication information from the session management network element, the capability indication information is used to indicate that dual connectivity is supported; according to the capability indication information, Determine to send wireless access priority information of the service to the session management network element.
  • the session management network element is further configured to receive first information from the access network device, where the first information indicates downlink tunnel information of the access network, and the access
  • the network downlink tunnel information is used to indicate the downlink tunnel information corresponding to the QoS flow
  • the access network downlink tunnel information is the access corresponding to the preferred radio access technology indicated by the radio access priority information of the QoS flow
  • Downlink tunnel information of the network device sending the access network downlink tunnel information to the user plane network element.
  • the session management network element is also used to send core network uplink tunnel information to the access network device.
  • the session management network element is used to determine the wireless access priority information of the QoS flow, which specifically includes: used to obtain second information, where the second information is the session information of the terminal device Data Network Name (DNN), the QoS flow is the QoS flow of the session; and, according to the wireless access priority information corresponding to the second information, the wireless access priority of the QoS flow is determined Level information.
  • the second information is the session information of the terminal device Data Network Name (DNN)
  • the QoS flow is the QoS flow of the session
  • the wireless access priority of the QoS flow is determined Level information.
  • the session management network element is used to send the wireless access priority information of the QoS flow to the access network device, which specifically includes: is used to send N2 to the access network device. Session management information, where the N2 session management information includes wireless access priority information of the QoS flow.
  • the radio access technology used by the QoS flow is Evolved Universal Terrestrial Radio Access (EUTRA) or New Radio (NR).
  • EUTRA Evolved Universal Terrestrial Radio Access
  • NR New Radio
  • the access network device shown in FIG. 1A may also be referred to as a first access network device.
  • the first access network device is used to determine wireless access priority information of a QoS flow, and the wireless access priority of the QoS flow
  • the information is used to indicate the priority of the wireless access technology used by the QoS flow; the wireless access technology used to establish the QoS flow is determined according to the wireless access priority information of the QoS flow.
  • the session management network element is configured to receive first information from a first access network device, where the first information indicates access network downlink tunnel information, and the access network downlink tunnel information is used to indicate the corresponding QoS flow Downlink tunnel information, where the access network downlink tunnel information is the downlink tunnel information of the access network device corresponding to the preferred radio access technology indicated by the radio access priority information of the QoS flow.
  • the first access network device is further configured to receive core network uplink tunnel information from the session management network element.
  • the first access network device is used to determine the wireless access priority information of the QoS flow, which specifically includes: receiving the wireless access priority of the QoS flow from the session management network element Information; or, obtain the 5G QoS Identifier (5G QoS Identifier, 5QI) of the QoS flow, and determine the wireless access priority information of the QoS flow according to the wireless access priority information corresponding to the 5QI; or, obtain The QoS attribute value of the QoS flow determines the wireless access priority information of the QoS flow according to the corresponding relationship of the wireless access priority information corresponding to the QoS attribute value.
  • 5G QoS Identifier 5QI
  • the first access network device is also used for the wireless access technology used by the QoS flow determined by the first access network device to correspond to the first access network device If the wireless access technology is the same, it is determined that the first access network device establishes the QoS flow; or, the wireless access technology used by the QoS flow determined by the first access network device is the same as the If the radio access technologies corresponding to the first access network device are not the same, it is determined that the second access network device establishes the QoS flow; the first access network device and the second access network device are dual Connect the main access network device and the auxiliary access network device in the scenario.
  • the present application provides yet another communication system, which includes a session management network element and a policy control network element.
  • the system further includes an access network device (the access network device may also be referred to as a first access network device).
  • the policy control network element is used to send wireless access priority information of the service to the session management network element, and the wireless access priority information of the service is used to indicate the priority of the wireless access technology used by the service
  • the session management network element is used to determine third information according to the wireless access priority information of the service, the third information is access network tunnel information or indication information, and the indication information is used to indicate Information about the radio access technology selected for use; and sending the third information to the first access network device.
  • the first access network device is the main access network device, and the second access network device is the auxiliary access network device;
  • the third information is the first access technology Access network tunnel information of the network access device; or, when the wireless access technology of the service indicated by the wireless access priority information of the service is the wireless access technology corresponding to the second access network device , The third information is the access network tunnel information of the second access network device; or,
  • the third information is the indication information
  • the indication information is used to indicate that the selected radio access technology information is the radio access technology information corresponding to the first access network device; or, when the radio access priority information of the service indicates the service
  • the radio access technology to be used preferentially is the radio access technology corresponding to the second access network device
  • the third information is the indication information
  • the indication information is used to indicate that the selected radio access technology information is Radio access technology information corresponding to the second access network device.
  • the third information is the indication information .
  • the indication information is used to indicate that the selected radio access technology information is the radio access technology information corresponding to the first access network device;
  • the third information is the indication
  • the indication information is used to indicate that the radio access technology information selected for use is target radio access technology information, and the target radio access technology information is different from the radio access technology information corresponding to the first access network device. the same.
  • the policy control network element is also used to receive the wireless access tendency information of the service from the application function network element, and the wireless access tendency information is used to indicate the service tendency to use The priority of the wireless access technology; the wireless access priority information of the service is determined according to the wireless access tendency information; or, it is used to determine the wireless access priority information of the service according to the subscription information of the service and/or the service corresponds to different The service experience information of the wireless access technology determines the wireless access priority information of the service.
  • the information of the wireless access technology selected for use is the wireless access technology selected for use or path information corresponding to the wireless access technology selected for use.
  • FIG. 2A it is a schematic diagram of a fifth generation (5G) network architecture based on a service-oriented architecture.
  • the 5G network architecture shown in FIG. 2A may include three parts, namely, a terminal equipment part, a data network (DN), and an operator network part.
  • DN data network
  • the functions of some of the network elements are briefly introduced below.
  • the operator network may include one or more of the following network elements: network exposure function (NEF) network elements, policy control function (PCF) network elements, unified data management (unified data management) , UDM) network element, network storage function (Network Repository Function, NRF) network element, application function (AF) network element, access and mobility management function (access and mobility management function, AMF) network element, session Management function (session management function, SMF) network elements, radio access network (radioaccess network, RAN), and user plane function (user plane function, UPF) network elements, etc.
  • NRF network exposure function
  • PCF policy control function
  • UDM network management network element
  • NRF Network Repository Function
  • AF application function
  • AMF access and mobility management function
  • SMF session Management function
  • radio access network radio access network
  • RAN radio access network
  • UPF user plane function
  • Terminal device also called user equipment (user equipment, UE)
  • UE user equipment
  • UE user equipment
  • UE user equipment
  • UE wireless transceiver function
  • land including indoor or outdoor, handheld or vehicle-mounted; it can also be deployed on water On board (such as ships, etc.); it can also be deployed in the air (such as airplanes, balloons, and satellites, etc.).
  • the terminal device may be a mobile phone (mobile phone), a tablet computer (pad), a computer with wireless transceiver function, a virtual reality (VR) terminal, an augmented reality (AR) terminal, an industrial control (industrial control) Wireless terminals in ), wireless terminals in self-driving, wireless terminals in remote medical, wireless terminals in smart grid, and wireless terminals in transportation safety , Wireless terminals in smart cities, wireless terminals in smart homes, etc.
  • VR virtual reality
  • AR augmented reality
  • industrial control industrial control
  • Wireless terminals in wireless terminals in self-driving, wireless terminals in remote medical, wireless terminals in smart grid, and wireless terminals in transportation safety , Wireless terminals in smart cities, wireless terminals in smart homes, etc.
  • the above-mentioned terminal equipment can establish a connection with the operator's network through an interface (such as N1, etc.) provided by the operator's network, and use services such as data and/or voice provided by the operator's network.
  • the terminal device can also access the DN through the operator's network, and use the operator's service deployed on the DN and/or the service provided by a third party.
  • the above-mentioned third party may be a service party other than the operator's network and terminal equipment, and may provide other services such as data and/or voice for the terminal equipment.
  • the specific form of expression of the above-mentioned third party can be determined according to actual application scenarios, and is not limited here.
  • RAN is a sub-network of an operator's network, and an implementation system between core network nodes and terminal equipment in the operator's network.
  • the terminal device To access the operator's network, the terminal device first passes through the RAN, and then can be connected to the service node of the operator's network through the RAN.
  • the RAN device in this application is a device that provides wireless communication functions for terminal devices, and the RAN device is also called an access network device.
  • the RAN equipment in this application includes but is not limited to: next-generation base stations (gnodeB, gNB), evolved node B (evolved node B, eNB), radio network controller (RNC), node B in 5G (node B, NB), base station controller (BSC), base transceiver station (BTS), home base station (for example, home evolved nodeB, or home node B, HNB), baseband unit (baseBand) unit, BBU), transmission point (transmitting and receiving point, TRP), transmission point (transmitting point, TP), mobile switching center, etc.
  • next-generation base stations gnodeB, gNB
  • evolved node B evolved node B
  • RNC radio network controller
  • node B in 5G node B, NB
  • BSC base station controller
  • BTS base transceiver station
  • home base station for example, home evolved nodeB, or home node B, HNB
  • TRP transmission point
  • the AMF network element is a control plane network element provided by the operator's network. It is responsible for the access control and mobility management of terminal equipment accessing the operator's network, including mobile status management, allocation of temporary user identities, authentication and authorization of users, etc. Features.
  • the SMF network element is mainly responsible for session management in the mobile network, such as session establishment, modification, and release. Specific functions such as assigning IP addresses to users, selecting UPF that provides message forwarding functions, and so on.
  • the UPF network element is responsible for the forwarding and receiving of user data in the terminal equipment.
  • User data can be received from the data network and transmitted to the terminal device through the access network device; the UPF network element can also receive user data from the terminal device through the access network device and forward it to the data network.
  • the transmission resources and scheduling functions of the UPF network element that provide services for the terminal equipment are managed and controlled by the SMF network element.
  • a DN is a network located outside the operator's network.
  • the operator's network can access multiple DNs, and multiple services can be deployed on the DN, which can provide data and/or voice services for terminal devices.
  • DN is a private network of a smart factory.
  • the sensors installed in the workshop of the smart factory can be terminal devices.
  • a control server for the sensors is deployed in the DN, and the control server can provide services for the sensors.
  • the sensor can communicate with the control server, obtain instructions from the control server, and transmit the collected sensor data to the control server according to the instructions.
  • the DN is the internal office network of a company.
  • the mobile phones or computers of the employees of the company can be terminal devices, and the mobile phones or computers of the employees can access the information and data resources on the internal office network of the company.
  • UDM network element used to generate authentication credential, user identification processing (such as storage and management of user permanent identities, etc.), access authorization control and contract data management, etc.
  • NEF network elements are mainly used to support the opening of capabilities and events.
  • the AF network element mainly supports interaction with the 3rd generation partnership project (3rd generation partnership project, 3GPP) core network to provide services, such as influencing data routing decisions, policy control functions, or providing third-party services to the network side.
  • 3rd generation partnership project 3rd generation partnership project, 3GPP
  • the PCF network element mainly supports the provision of a unified policy framework to control network behavior, provides policy rules to the control layer network functions, and is responsible for obtaining user subscription information related to policy decisions.
  • the NRF network element can be used to provide the network element discovery function, and provide the network element information corresponding to the network element type based on the request of other network elements.
  • NRF also provides network element management services, such as network element registration, update, de-registration, and network element status subscription and push.
  • Nnef, Npcf, Nudm, Naf, Namf, Nsmf, N1, N2, N3, N4, and N6 are interface serial numbers.
  • the meaning of these interface serial numbers can be referred to the meaning defined in the 3GPP standard protocol, which is not limited here.
  • FIG. 2B it is a schematic diagram of a 5G network architecture based on a point-to-point interface.
  • the interfaces between the various network elements in FIG. 2B are point-to-point interfaces, rather than service-oriented interfaces.
  • the interface between the UE and the AMF network element is called the N1 interface
  • the interface between the AMF network element and the RAN device is called the N2 interface
  • the interface between the RAN device and the UPF network element It can be called N3 interface
  • the interface between SMF network element and UPF network element is called N4 interface
  • the interface between PCF network element and AF network element is called N5 interface
  • the interface between UPF network element and DN is called N6 Interface
  • the interface between SMF network element and PCF network element is called N7 interface
  • the interface between AMF network element and UDM network element is called N8 interface
  • the interface between different UPF network elements is called N9 interface
  • UDM network element The interface with the SMF network element is called the N10 interface
  • the interface between the AMF network element and the SMF network element is called the N11 interface
  • the interface between different AMF network elements is called the N14 interface.
  • the interface between is called N15 interface.
  • the aforementioned network elements or functions may be network elements in hardware devices, software functions running on dedicated hardware, or virtualization functions instantiated on a platform (for example, a cloud platform).
  • a platform for example, a cloud platform.
  • the foregoing network element or function may be implemented by one device, or jointly implemented by multiple devices, or may be a functional module in one device, which is not specifically limited in the embodiment of the present application.
  • the mobility management network element, session management network element, policy control network element, application function network element, access network device, network opening function network element, and user plane network element in this application may be those in FIG. 2A or FIG. 2B, respectively.
  • 6G 6th generation
  • mobility management network elements, session management network elements, policy control network elements, application function network elements, access network equipment, network open function network elements, and user plane network elements are respectively the above-mentioned AMF, SMF, and SMF.
  • the terminal device is referred to as UE for short in this application.
  • the dual connectivity architecture defined by 3GPP.
  • the UE can simultaneously transmit services through two access network nodes, one of which is a master node (Master Node, MN), and the other is a secondary node (Secondary Node, SN).
  • Master Node MN
  • secondary Node Secondary Node
  • Dual connectivity scenarios include EUTRA-NR dual connectivity (that is, MN is eNB, SN is gNB, where eNB and 5G core network (5G core, 5GC) establish a signaling plane connection, such as radio resource control (Radio Resource Control, RRC) connection) , NR-EUTRA dual connectivity (that is, MN is gNB, SN is eNB, where gNB and 5GC establish a signaling plane connection) and NR-NR dual connectivity (MN is gNB, SN is also gNB, as MN's gNB and 5GC establish communication ⁇ ).
  • EUTRA-NR dual connectivity that is, MN is eNB, SN is gNB, where eNB and 5G core network (5G core, 5GC) establish a signaling plane connection, such as radio resource control (Radio Resource Control, RRC) connection
  • NR-EUTRA dual connectivity that is, MN is gNB, SN is eNB, where gNB and 5GC establish a signaling plane connection
  • the control plane interface between MN and 5GC is NG-C
  • the user plane interface between MN and 5GC is NG-U
  • the user plane interface between SN and 5GC is NG-U.
  • the control plane interface between MN and SN is Xn-c
  • the user plane interface is Xn-U.
  • the access network node may also be referred to as an access network device, a site, a network device, and so on.
  • the two access network nodes in the DC scenario may also be referred to as the master radio access network (Master Radio Access Network, M-RAN) device and the secondary radio access network (Secondary Radio Access Network, S -RAN) equipment, or may also be referred to as a primary station and a secondary station, or may also be referred to as a primary network equipment station and a secondary network equipment, respectively.
  • MN and SN two access network nodes
  • FIG. 4 it is a schematic diagram of the process of the wireless network side when inserting the SN in the prior art, where the inserting of the SN is determined by the MN.
  • the process includes the following steps:
  • step 401 the MN determines that the SN requests the SN to allocate resources for one or more specific PDU sessions or QoS flows, and then sends an SN Addition Request (SN Addition Request) to the SN. Accordingly, the SN can receive the SN Addition Request.
  • SN Addition Request SN Addition Request
  • the request includes QoS flow-level QoS parameters, PDU-session-level transport network layer (Transport Network layer, TNL) address information, and PDU-session-level slice information.
  • PDU-session-level transport network layer Transport Network layer, TNL
  • PDU-session-level slice information PDU-session-level slice information.
  • step 402 the SN determines that the requested resource is supported, and then allocates the corresponding radio resource, and then the SN sends an SN Addition Request Acknowledge message to the MN. Accordingly, the MN can receive the SN Addition Request Acknowledge message.
  • This message contains SN RRC configuration message, NG-U DL TNL address information and security algorithm.
  • the message may also include Xn-U DL TNL address information.
  • Step 402a For the terminated bearer on the SN using the Master Cell Group (MCG) resource, the MN may provide the Xn-U DL TNL address information to the SN.
  • MCG Master Cell Group
  • This step is optional.
  • MCG is a cell group formed by cells on the MN.
  • Step 403 The MN sends a MN RRC reconfiguration message (RRC reconfiguration message) to the UE, and accordingly, the UE can receive the MN RRC reconfiguration message.
  • RRC reconfiguration message MN RRC reconfiguration message
  • the message includes the SN RRC configuration message in step 402 above.
  • step 404 the UE applies the new configuration and sends a MN RRC reconfiguration complete message (RRC reconfiguration complete message) to the MN. Accordingly, the MN can receive the MN RRC reconfiguration complete message.
  • RRC reconfiguration complete message MN RRC reconfiguration complete message
  • This message contains the SN RRC response message.
  • step 405 the MN sends an SN reconfiguration complete message (SN Reconfiguration Complete message) to the SN, and accordingly, the SN can receive the SN reconfiguration complete message.
  • SN Reconfiguration Complete message SN Reconfiguration Complete message
  • This message contains the SN RRC response message.
  • Step 406 If the configured resources require secondary cell group (Secondary Cell Group, SCG) radio resources, the UE initiates a random access procedure (Random Access Procedure), and the UE performs synchronization.
  • SCG Secondary Cell Group
  • This step is optional.
  • SCG is a cell group formed by cells on the SN.
  • Step 407 If the radio link control (Radio Link Control, RLC) Am is used on the bearer of the SN, the MN sends an SN Status Transfer (SN Status Transfer) to the SN.
  • RLC Radio Link Control
  • This step is optional.
  • Step 408 The MN sends a data packet (Data Forwarding) to the SN.
  • step 412 for the bearer terminated in the SN, the SN and the 5GC execute the PDU session path update process.
  • the specific process can refer to Figure 5).
  • FIG. 5 it is a schematic diagram of the flow on the core network side when the SN is inserted in the prior art.
  • the process includes the following steps:
  • step 501 the MN sends an N2 QoS flow mobility indication message to the AMF, and accordingly, the AMF can receive the N2 QoS flow mobility indication message.
  • the message contains PDU session ID (PDU session ID), one or more QoS flow IDs (QoS flow identity, QFI) and access network (Access Network, AN) tunnel information.
  • PDU session ID PDU session ID
  • QoS flow identity QoS flow identity, QFI
  • access network Access Network
  • step 502 the AMF sends a PDU session update request (Nsmf_PDUSession_UpdateSMContext request) message to the SMF, and accordingly, the SMF can receive the PDU session update request message.
  • PDU session update request Nsmf_PDUSession_UpdateSMContext request
  • This message contains the N2 QoS flow mobility indication (N2 QoS flow mobility indication) message.
  • Step 503 The SMF sends an N4 session modification request (N4 Session modification request) message to the UPF, and accordingly, the UPF can receive the N4 session modification request message.
  • N4 Session modification request N4 Session modification request
  • This message contains QFI and AN tunnel information.
  • step 504 the UPF sends an N4 session modification response (N4 Session modification response) message to the SMF, and accordingly, the SMF can receive the N4 session modification response message.
  • N4 Session modification response N4 Session modification response
  • This message contains CN tunnel information.
  • the CN tunnel information is UPF tunnel information.
  • Step 505 The SMF sends a PDU session update response (Nsmf_PDUSession_UpdateSMContext response) message to the AMF, and accordingly, the AMF can receive the PDU session update response message.
  • PDU session update response Nsmf_PDUSession_UpdateSMContext response
  • the message contains N2 SM information, and the N2 SM information contains CN tunnel information.
  • Step 506 in order to assist the reordering function of the MN and/or SN, for each affected N3 tunnel, when the QFI is switched to a new tunnel (that is, when the data corresponding to the QFI is used for transmission using a new path), the UPF sends an OR Multiple end marker data packets.
  • This step includes the following steps 506a and/or step 506b:
  • step 506a the UPF sends to the MN an end marking data packet for flow transfer to the SN, and the MN forwards the end marking data packet for flow transfer to the SN to the SN.
  • step 506b the UPF sends an end marking data packet for flow transfer to the MN to the SN, and the SN forwards the end marking data packet for flow transfer to the MN to the MN.
  • step 507 the AMF sends an N2 QoS flow mobility confirmation (N2 QoS flow mobility confirm) message to the MN, and accordingly, the MN can receive the N2 QoS flow mobility confirmation message.
  • N2 QoS flow mobility confirm N2 QoS flow mobility confirm
  • This message contains the aforementioned N2 SM information.
  • the SN insertion and whether the QoS flow data packet is transmitted on the MN or the SN are all made by the MN.
  • the embodiments of the present application can solve the above technical problems, so as to realize more flexible and effective use of EUTRA access and NR access.
  • FIG. 6A it is a schematic flowchart of a communication method provided in this application. The method includes the following steps:
  • step 601a the SMF determines the wireless access priority information of the QoS flow, and the wireless access priority information of the QoS flow is used to indicate the priority of the wireless access technology used by the QoS flow.
  • step 602a the SMF sends the wireless access priority information of the QoS flow to the RAN, and accordingly, the RAN can receive the wireless access priority information of the QoS flow.
  • the QoS flow here is used to transmit services.
  • the RAN After the RAN receives the wireless access priority information of the QoS flow, it determines the wireless access technology used to establish the QoS flow according to the wireless access priority information. For example, if the wireless access priority information of the QoS flow indicates that the priority of NR is higher than that of EUTRA, the RAN can determine that the wireless access technology used to establish the QoS flow is NR; for another example, the wireless access priority information of the QoS flow indicates The priority of EUTRA is higher than NR, then the RAN can determine that the radio access technology used to establish the QoS flow is EUTRA.
  • RAN here refers to MN.
  • the SMF determines the wireless access priority information of the QoS flow, and then sends the wireless access priority information of the QoS flow to the RAN, so that the RAN can determine the wireless access priority information of the QoS flow to use to establish the QoS flow
  • the wireless access technology realizes the dynamic selection of the wireless access technology according to the wireless access priority information of the QoS flow, so it is more flexible.
  • step 601a of the above solution the method for SMF to determine the wireless access priority information of the QoS flow includes but is not limited to:
  • Method 1 The SMF receives the wireless access priority information of the service from the PCF, and determines the wireless access priority information of the QoS flow according to the service.
  • the PCF determines the wireless access priority information of the service, for example: the PCF receives the wireless access priority tendency information from the AF, and determines the wireless access priority information according to the wireless access priority tendency information; or, the PCF may also base on the subscription information (For example, service policy contract information) and/or information provided by the network element of the network data analysis function (NetWork Data Analysis Function, NWDAF) (such as service experience information when the service is transmitted using EUTRA or NR respectively) determines the wireless access priority information.
  • the service policy subscription information indicates the preferred radio access technology, or the radio access technology with better service experience as the preferred radio access technology.
  • the wireless access priority information of the QoS flow determined by the SMF according to the wireless access priority information of the service may be different in form from the wireless access priority information of the received service, but the indicated wireless The priority of the access technology is the same. For example, if the wireless access priority information of the service indicates that the priority of NR is greater than the priority of EUTRA, the wireless access priority information of the QoS flow also indicates that the priority of NR is greater than the priority of EUTRA.
  • steps 603a to 605a may be further included:
  • step 603a the RAN sends the first information to the SMF, and accordingly, the SMF can receive the first information.
  • the first information indicates the access network downlink tunnel information
  • the access network downlink tunnel information is used to indicate the downlink tunnel information corresponding to the QoS flow
  • the access network downlink tunnel information is the priority use indicated by the wireless access priority information of the QoS flow
  • the downlink tunnel information of the RAN corresponding to the radio access technology.
  • the first information may have different implementation methods in different scenarios, which will be described separately below.
  • RAN here refers to MN.
  • the downlink tunnel information of the MN and the downlink tunnel information of the SN have been stored on the SMF.
  • the first information is the downlink tunnel information or the first indication of the MN . If the radio access technology determined by the MN according to the radio access priority information of the QoS flow is the same as the radio access technology corresponding to the SN, the first information is the downlink tunnel information or the second indication of the SN. Wherein, the first indication is 1-bit information "1", and the second indication is 1-bit information "0"; or, the first indication is 1-bit information "0", and the second indication is 1-bit information "1".
  • the first information is the downlink tunnel information or the first indication of the MN . If the wireless access technology determined by the MN according to the wireless access priority information of the QoS flow is the same as the wireless access technology corresponding to the SN, the first information is empty. Wherein, when the first information is predetermined to be empty, it means that the first information indicates the downlink tunnel information of the SN.
  • the first indication is 1-bit information, such as "1" or "0".
  • the first information is empty. If the radio access technology determined by the MN according to the radio access priority information of the QoS flow is the same as the radio access technology corresponding to the SN, the first information is the downlink tunnel information or the first indication of the SN. Wherein, when the first information is predetermined to be empty, it means that the first information indicates the downlink tunnel information of the MN.
  • the first indication is 1-bit information, such as "1" or "0".
  • the first information is the downlink tunnel information of the MN. If the wireless access technology determined by the MN according to the wireless access priority information of the QoS flow is not the same as the wireless access technology corresponding to the MN, the MN establishes a DC, that is, inserts the SN, and then sends the first information to the SMF, and the first information It is the downlink tunnel information of the SN.
  • step 604a the SMF sends the access network downlink tunnel information to the UPF.
  • the downlink tunnel information of the access network is the downlink tunnel information of the user plane, which is used by the UPF to send downlink data to the RAN.
  • step 605a the SMF sends the core network uplink tunnel information to the RAN.
  • the uplink tunnel information on the core network is the uplink tunnel information on the user plane, which is used by the RAN to send uplink data to the UPF.
  • a user plane tunnel can be established.
  • the first RAN determines that the first RAN establishes the QoS flow.
  • the radio access technology used by the QoS flow determined by the first RAN is different from the radio access technology corresponding to the first RAN, the first RAN determines that the second RAN establishes the QoS flow.
  • Method 2 The SMF obtains second information, the second information is the DNN of the UE's session, and the SMF determines the wireless access priority information of the QoS flow according to the wireless access priority information corresponding to the second information.
  • the SMF is pre-configured or predetermined in the protocol with second information, and radio access priority information corresponding to the second information
  • the second information is the DNN of the UE's session.
  • the SMF obtains the second information, it can determine the wireless access priority information corresponding to the second information based on the stored corresponding relationship, and then determine the wireless access priority information for the QoS flow based on the wireless access priority information corresponding to the second information.
  • the QoS flow is the QoS flow of the session.
  • the wireless access priority information corresponding to the second information can be used as the wireless access priority information of the QoS flow, or the wireless access priority information corresponding to the second information can be replaced with other expressions, but The priority order of the wireless access technologies corresponding to the wireless access priority information remains unchanged, so that the wireless access priority information of the QoS flow is obtained.
  • the SMF may also obtain the wireless access priority information corresponding to the second information from the UDM according to the second information. Furthermore, the wireless access priority information of the QoS flow is determined according to the wireless access priority information corresponding to the second information.
  • the foregoing step 602a may be specifically implemented as: SMF sends N2 session management information to the RAN, and the N2 session management information includes wireless access priority information of the QoS flow.
  • FIG. 6B it is a schematic flow diagram of another communication method provided in this application.
  • the method includes the following steps:
  • step 601b the SMF receives the wireless access priority information of the service from the PCF, and the wireless access priority information of the service is used to indicate the priority of the wireless access technology used by the service.
  • Step 602b The SMF determines third information according to the wireless access priority information of the service.
  • the third information is access network tunnel information or indication information, and the indication information is used to indicate the selected radio access technology information.
  • the wireless access technology information selected for use herein may be the wireless access technology selected for use, or may also be path information corresponding to the wireless access technology selected for use.
  • Step 603b the SMF sends the third information to the first RAN.
  • the first RAN can receive the third information.
  • the PCF determines the wireless access priority information of the service and sends it to the SMF.
  • the SMF determines the third information according to the wireless access priority information of the service and sends the third information to the first RAN, that is, the SMF determines the specific use Which type of wireless access technology or the selected access network tunnel information realizes the dynamic selection of the wireless access technology according to the wireless access priority information of the service, so it is more flexible.
  • the third information is the first RAN.
  • a RAN access network tunnel information when the radio access technology that the service preferentially uses indicated by the radio access priority information of the service is the radio access technology corresponding to the second RAN, the third information is the access network tunnel information of the second RAN.
  • the third information is indication information, and the indication information is used for Indicate that the radio access technology information selected for use is the radio access technology information corresponding to the first RAN.
  • the third information is indication information, and the indication information is used to indicate the selected radio access technology information is Radio access technology information corresponding to the second RAN.
  • the third information is indication information, and the indication information is used to indicate the selected wireless access.
  • the technical information is the radio access technical information corresponding to the first RAN.
  • the first RAN is established to establish the DC, that is, the second RAN is inserted, and the third information
  • the indication information is used to indicate that the selected radio access technology information is the target radio access technology information, and the target radio access technology information is different from the radio access technology information corresponding to the first RAN, that is, the target radio access technology information
  • the incoming technology information is the radio access technology information corresponding to the second RAN.
  • FIG. 7 it is a schematic flowchart of another communication method provided by this application. The method includes the following steps:
  • step 701a the AF sends the first information to the PCF, and accordingly, the PCF can receive the first information.
  • the first information is application information (Application information) or service information (service information), and the service information is used to indicate service type or service description information (such as service IP address, port) and other information.
  • Application information Application information
  • service information service information
  • service information is used to indicate service type or service description information (such as service IP address, port) and other information.
  • the first information may also include wireless access tendency information.
  • the wireless access tendency information is used to indicate the priority of different wireless accesses.
  • the wireless access tendency information may be: EUTRA, with a priority value of X; NR, with a priority value of Y.
  • EUTRA with a priority value of X
  • NR with a priority value of Y.
  • the smaller the priority value the higher the priority. Therefore, when X is less than Y, it indicates that EUTRA is preferred when both types of wireless access are available.
  • X is greater than Y, it indicates that when both wireless accesses are available, NR is preferred.
  • X is equal to Y, it indicates that when both wireless accesses are available, NR or EUTRA is randomly selected to use.
  • the higher the priority value the higher the priority.
  • the implementation method is similar to the above method, and will not be repeated here.
  • the wireless access tendency information may be 1-bit indication information.
  • the indication information is "1" it indicates that when both wireless accesses are available, NR is preferred; when the indication information is "0", it indicates that when both wireless accesses are available, NR is preferred.
  • EUTRA EUTRA.
  • the indication information is "0”, it indicates that when both wireless accesses are available, NR is preferred; when the indication information is "1”, it indicates that when both wireless accesses are available When, EUTRA is preferred.
  • 2 bits or more can be used to indicate wireless access tendency information.
  • the wireless access tendency information may be: (NR, EUTRA), indicating that when both types of wireless access are available, NR is preferred.
  • the wireless access tendency information may be: (EUTRA, NR), indicating that EUTRA is preferentially used when both types of wireless access are available.
  • this method can also be used to indicate wireless access tendency information.
  • the PCF determines a Policy and Charging Control (PCC) rule, and the PCC rule includes wireless access priority information.
  • PCC Policy and Charging Control
  • the PCF can be based on subscription information (such as service policy subscription information) and/or information provided by NWDAF network elements (such as service separate Use the service experience information during EUTRA or NR transmission) to determine the wireless access priority information of the service.
  • subscription information such as service policy subscription information
  • NWDAF network elements such as service separate Use the service experience information during EUTRA or NR transmission
  • the service policy subscription information indicates the preferred radio access technology, or the radio access technology with better service experience as the preferred radio access technology.
  • the PCF may determine wireless access priority information according to the wireless access tendency information, for example, the wireless access determined by the PCF The priority information may be the same as the wireless access tendency information.
  • the PCF may also determine wireless access priority information according to wireless access tendency information and subscription information (such as service policy subscription information).
  • the PCF may also determine the wireless access priority information based on the wireless access tendency information and the information provided by the NWDAF network element (for example, service experience information when the service is transmitted using EUTRA or NR respectively).
  • the PCF may also determine the wireless access priority information of the service according to the wireless access tendency information, subscription information, and information provided by the NWDAF network element (such as service experience information when the service uses EUTRA or NR transmission respectively).
  • step 701c the PCF sends a PCC rule containing wireless access priority information of the service to the SMF, and accordingly, the SMF can receive the PCC rule.
  • the PCF sends a PCF initiated SM Policy Association Modification message to the SMF, which contains the PCC rules.
  • the MN sends the MN's capability indication information to the SMF, and the capability indication information may be NR-EUTRA, NR-NR or EUTRA-NR.
  • the capability indication information may indicate that it supports NR-EUTRA or NR-NR; if the MN is EUTRA, the capability indication information may indicate that it supports EUTRA-NR.
  • the SMF sends capability indication information to the PCF. If the capability indication information indicates that the DC supports two different types of wireless access technologies, the PCF will include the wireless access priority information of the aforementioned services in the PCC rules.
  • Step 702 The SMF determines to initiate a PDU session modification process.
  • Step 703 The SMF sends a first request (such as Namf_Communication_N1N2MessageTransfer) to the AMF, and accordingly, the AMF can receive the first request.
  • a first request such as Namf_Communication_N1N2MessageTransfer
  • the first request includes the PDU session identifier, N1 SM container, and N2 SM information.
  • the N1 SM container is sent to the UE, and the N2 SM information is sent to the MN.
  • the N2 SM information includes the PDU session identifier, QFI, QoS profile, and wireless access priority information of the QoS flow.
  • the wireless access priority information of the QoS flow is determined according to the wireless access priority information of the service.
  • the priority of the wireless access technology indicated by the wireless access priority information of the QoS flow is the same as the priority of the wireless access technology indicated by the wireless access priority information of the service, but the wireless access priority information of the QoS flow is the same as that of the service.
  • the wireless access priority information can be different in form or expression.
  • the MN sends the MN's capability indication information to the SMF, and the capability indication information may be NR-EUTRA, NR-NR or EUTRA-NR.
  • the capability indication information may indicate that it supports NR-EUTRA or NR-NR; if the MN is EUTRA, the capability indication information may indicate that it supports EUTRA-NR. If the capability indication information indicates that the DC supports two different types of radio access technologies, the SMF includes the radio access priority information of the aforementioned QoS flow in the first request.
  • step 703a the AMF sends a first response (such as Namf_Communication_N1N2MessageTransfer response) to the SMF, and accordingly, the SMF can receive the first response.
  • a first response such as Namf_Communication_N1N2MessageTransfer response
  • step 704 the AMF sends an N2 session request (N2 session Request) message to the MN, and accordingly, the MN can receive the N2 session request message.
  • N2 session Request N2 session Request
  • the request message contains the aforementioned N1 SM container and the aforementioned N2 SM information.
  • Step 705 The MN determines the service transmission path according to the wireless access priority information of the QoS flow.
  • the MN determines that the MN establishes the QoS flow corresponding to the service.
  • the MN determines that the SN establishes the QoS flow corresponding to the service.
  • the MN determines that there is no need to establish a DC, that is, there is no need to insert an SN, and the MN determines that the MN will Establish the QoS flow corresponding to the business.
  • the MN determines that the DC needs to be established, that is, the SN needs to be inserted, and the MN determines that it is established by the SN QoS flow corresponding to the business.
  • the MN determines that it can use The wireless access with low priority establishes the QoS flow corresponding to the service.
  • Step 706 The MN and the UE perform An-specific resource modification (AN-specific resource modification) to establish air interface resources.
  • An-specific resource modification AN-specific resource modification
  • Step 707 The MN sends an N2 session response (N2 session response) message to the AMF, and accordingly, the AMF can receive the N2 session response message.
  • N2 session response N2 session response
  • the N2 session response message includes a non-access stratum (NAS) message and N2 SM information.
  • NAS non-access stratum
  • the N2 session response message may also carry a cause value for the establishment failure.
  • the AN DL tunnel information needs to be indicated through the N2 session response message, and the AN tunnel information is used to indicate the downlink tunnel information corresponding to the QoS flow.
  • the following describes two different implementation methods for indicating AN DL tunnel information through the N2 session response message.
  • N2 SM information contains AN tunnel information, and the AN tunnel information can be MN tunnel information or SN tunnel information.
  • This method is a method of displaying instructions, that is, displaying and indicating AN tunnel information in the N2 SM information.
  • N2 SM information contains AN tunnel information, indicating that the downlink tunnel information corresponding to QoS flow is MN tunnel information, and N2 SM information does not contain AN tunnel information, indicating that the downlink tunnel information corresponding to QoS flow is SN tunnel information.
  • N2 SM information contains AN tunnel information, indicating that the downlink tunnel information corresponding to the QoS flow is SN tunnel information, and the N2 SM information does not contain AN tunnel information, indicating that the downlink tunnel information corresponding to the QoS flow is MN tunnel information.
  • this method is for the scenario where DC has been established.
  • Two AN tunnel information are stored in SMF, namely MN tunnel information and SN tunnel information, and one of the default tunnel information, namely N2 SM information
  • the default tunnel information is determined to be the downlink tunnel information corresponding to the QoS flow.
  • the setting of the default tunnel information may be notified to the SMF by the MN during the DC establishment process, or the rules may be pre-configured on the SMF and the MN.
  • the first AN tunnel information established is the default tunnel information.
  • step 708a the AMF sends a second request (such as Nsmf_PDUSession_UpdateSMContextrequest) to the SMF, and accordingly, the SMF can receive the second request.
  • a second request such as Nsmf_PDUSession_UpdateSMContextrequest
  • the second request carries the aforementioned NAS message and the aforementioned N2 SM information.
  • step 708b the SMF sends a second response (such as Nsmf_PDUSession_UpdateSMContextresponse) to the AMF, and accordingly, the AMF can receive the second response.
  • a second response such as Nsmf_PDUSession_UpdateSMContextresponse
  • the second response may include CN UL tunnel information.
  • Step 708c If the second response received by the AMF contains CN UL tunnel information, the AMF sends the CN UL tunnel information to the MN, and accordingly, the MN can receive the CN UL tunnel information.
  • the AMF sends an N2 session notification (N2 Session notification) to the MN.
  • the N2 session notification includes N2 SM information, and the N2 SM information includes CN UL tunnel information.
  • This step is optional.
  • step 709 the SMF determines to execute the N4 session modification process.
  • step 705 DC needs to be established in step 705, that is, the AN DL tunnel in step 708a is the newly created SN tunnel information, and the UPF allocates the CN UL tunnel information, you need to perform step 710 and then perform step 708b, otherwise there is no The limit.
  • Step 710 SMF initiates N4 session modification to UPF.
  • the PCF generates PCC rules containing the wireless access priority information of the service according to the service requirements of the AF, and sends it to the SMF. Further, the SMF determines the wireless access priority of the QoS flow according to the wireless access priority information of the service. Level information, and send the wireless access priority information of the QoS flow to the RAN, so that the RAN can select the wireless access technology according to the priority information of the QoS flow, thereby helping to ensure that different services use the wireless access technology on demand .
  • FIG. 8 it is a schematic flowchart of another communication method provided by this application. The method includes the following steps:
  • Step 801a to step 802 are the same as step 701a to step 702 in the embodiment of FIG. 7, and reference may be made to the foregoing description.
  • step 803 the SMF sends a first request (such as Namf_Communication_N1N2MessageTransfer) to the AMF, and accordingly, the AMF can receive the first request.
  • a first request such as Namf_Communication_N1N2MessageTransfer
  • the first request includes the PDU session identifier, N1 SM container, and N2 SM information.
  • the N1 SM container is sent to the UE, and the N2 SM information is sent to the MN.
  • the N2 SM information includes the PDU session identifier, QFI, QoS profile, and second information.
  • the MN sends the capability indication information of the MN to the SMF, and the capability indication information may be NR-EUTRA, NR-NR or EUTRA-NR.
  • the capability indication information may indicate that it supports NR-EUTRA or NR-NR; if the MN is EUTRA, the capability indication information may indicate that it supports EUTRA-NR. If the capability indication information indicates that the DC supports two different types of radio access technologies, the SMF includes the above-mentioned second information in the first request.
  • the second information is AN tunnel information or indication information. That is, the SMF determines the selected wireless access technology type according to the wireless access priority information in the PCC rules, and then determines the AN tunnel information or determines the indication information according to the selected wireless access technology. The following two scenarios are explained separately.
  • ⁇ AN tunnel information 1, wireless technology type 1 ⁇ and ⁇ AN tunnel information 2, wireless technology type 2 ⁇ sent by the MN are stored on the SMF.
  • the SMF determines the AN tunnel information according to the PCC rules sent by the PCF. For example, if the selected wireless technology type is determined to be wireless technology type 1 (NR or EUTRA) according to the PCC rules, then the AN tunnel information is determined to be AN tunnel information 1. Therefore, the above second information It is AN tunnel information 1; for another example, if the selected wireless technology type is determined to be wireless technology type 2 according to the PCC rules, it is determined that the AN tunnel information is AN tunnel information 2, so the above second information is AN tunnel information 2.
  • pre-configured or agreed to use 1-bit indication information to indicate AN tunnel information for example, "1" indicates AN tunnel information 1, and "0" indicates AN tunnel information 2.
  • the above-mentioned second information is the indication information "1"; when it is determined that the AN tunnel information is the AN tunnel information 2, the above-mentioned second information is the indication information "0".
  • the wireless access technology type is wireless access technology type 1
  • the above second information is the indication information "1"
  • the above-mentioned second information is the indication information "0".
  • the above-mentioned second indication information is indication information, such as pre-configured or agreed to use 1-bit indication information to indicate the type of radio access technology used to establish the QoS flow transmission service. For example, “1" indicates wireless access technology type 1, and "0" indicates wireless access technology type 2.
  • the above second information is the indication information "1" ;
  • the above-mentioned second information is the indication information "0".
  • step 803a the AMF sends a first response (such as Namf_Communication_N1N2MessageTransfer response) to the SMF, and accordingly, the SMF can receive the first response.
  • a first response such as Namf_Communication_N1N2MessageTransfer response
  • step 804 the AMF sends an N2 session request (N2 session Request) message to the MN, and accordingly, the MN can receive the N2 session request message.
  • N2 session Request N2 session Request
  • the request message contains the aforementioned N1 SM container and the aforementioned N2 SM information.
  • Step 805 The MN determines the service transmission path according to the second information.
  • the MN determines that the MN establishes the QoS flow corresponding to the service; if the AN tunnel information is the SN tunnel information, the MN determines that the SN To establish the QoS flow corresponding to the business.
  • the second information is indication information
  • the indication information is used to indicate AN tunnel information
  • the MN determines that the MN establishes the QoS flow corresponding to the service; if the indication information indicates If it is the tunnel information of the SN, the MN determines that the SN establishes the corresponding QoS flow for the service.
  • the second information is indication information
  • the indication information indicates the type of radio access technology used to establish the QoS flow transmission service
  • the MN determines that the MN establishes the QoS flow corresponding to the service
  • the radio access technology type indicated by the indication information is the same as the radio access technology type corresponding to the SN
  • the MN determines that the SN establishes the QoS flow corresponding to the service.
  • the second information is indication information
  • the indication information indicates the type of radio access technology used to establish the QoS flow transmission service. If the type of radio access technology indicated by the indication information is the same as the type of radio access technology corresponding to the MN, the MN It is determined that the DC does not need to be established, that is, the SN does not need to be inserted, and the MN determines that the MN establishes the QoS flow corresponding to the service. If the radio access technology type indicated by the indication information is not the same as the radio access technology type corresponding to the MN, the MN determines that a DC needs to be established, that is, an SN needs to be inserted, and the MN determines that the SN establishes the QoS flow corresponding to the service.
  • the MN determines that it can use The wireless access with low priority establishes the QoS flow corresponding to the service.
  • Steps 806 to 810 are the same as steps 706 to 710 in the embodiment of FIG. 7, and reference may be made to the foregoing description.
  • the PCF generates the PCC rule containing the wireless access priority information of the service according to the service requirements of the AF and sends it to the SMF.
  • the further SMF sends AN tunnel information or instructions to the MN according to the wireless access priority information of the service.
  • Information, MN determines to establish QoS flow according to AN tunnel information or instruction information, or initiates a QoS flow establishment request to an already established SN, or inserts SN and sends a QoS flow establishment request to SN, so that services can be used preferentially according to requirements when conditions permit Appropriate wireless access technology.
  • FIG. 9 it is a schematic flowchart of another communication method provided by this application. The method includes the following steps:
  • Step 901 the UE sends an access stratum (access stratum, AS) message to the MN, and accordingly, the MN can receive the AS message.
  • AS access stratum
  • the AS message carries a NAS message
  • the NAS message includes a PDU session identifier, a data network name (DNN), a single network slice selection assistance information (S-NSSAI), and a session establishment request.
  • the session establishment request carries information such as the PDU session identifier and DNN.
  • step 902 the MN sends an N2 message to the AMF, and accordingly, the AMF can receive the N2 message.
  • the N2 message carries the above-mentioned NAS message and the location information of the UE.
  • the AMF selects the SMF according to the information such as DNN and S-NSSAI, and saves the correspondence between the PDU session identifier, S-NSSAI, DNN, and SMF ID.
  • step 904 the AMF sends a context establishment request (such as Nsmf_PDUSession_CreateSMContext request) to the SMF, and accordingly, the SMF can receive the context establishment request.
  • a context establishment request such as Nsmf_PDUSession_CreateSMContext request
  • the context establishment request carries a permanent subscription identifier (Subscription Permanent Identifier, SUPI), DNN, S-NSSAI, location information of the UE, and a session establishment request.
  • SUPI Subscriber Permanent Identifier
  • DNN DNN
  • S-NSSAI Session Permanent Identifier
  • location information of the UE location information of the UE
  • session establishment request carries a permanent subscription identifier (Subscription Permanent Identifier, SUPI), DNN, S-NSSAI, location information of the UE, and a session establishment request.
  • Step 905 SMF interacts with UDM to obtain session management subscription data (session management subscription data).
  • session management subscription data session management subscription data
  • SMF sends Nudm_SDM_Get Request to UDM, carrying UE identity, DNN, S-NSSAI and other information.
  • UDM returns Nudm_SDM_Get Response, which carries session management subscription data.
  • the session management subscription data includes wireless access priority information corresponding to the DNN.
  • step 906 the SMF sends a context establishment response (such as Nsmf_PDUSession_CreateSMContext Response) to the AMF, and accordingly, the AMF can receive the context establishment response.
  • a context establishment response such as Nsmf_PDUSession_CreateSMContext Response
  • step 907a if the PCC architecture is not used, the SMF determines the wireless access priority information of the QoS flow.
  • the session management subscription data in step 905 includes the wireless access priority information of the QoS flow corresponding to the DNN, and the SMF can determine the wireless access priority information of the QoS flow according to the DNN and the session management subscription data.
  • Method 2 The SMF is locally configured with the DNN and the wireless access priority information of the QoS flow corresponding to the DNN, and the SMF can determine the wireless access priority information of the QoS flow according to the DNN and the local configuration.
  • step 907b if the PCC architecture is used, the PCF determines the wireless access priority information of the service.
  • Method 1 The PCF obtains the wireless access priority information corresponding to the DNN from the UDR, and the PCF can determine the wireless access priority information of the service according to the wireless access priority information corresponding to the DNN and the DNN.
  • Method 2 The PCF is locally configured with the DNN and the wireless access priority information corresponding to the DNN, and the PCF can determine the wireless access priority information of the service according to the DNN and the local configuration.
  • steps 907a and step 907b are performed alternatively, that is, either step 907a is performed or step 907b is not performed.
  • step 907b is executed, after step 907b, the following step 908 is also executed.
  • Step 908 For the scenario using the PCC architecture, the SMF obtains the PDU session policy information from the PCF through the SM initiated SM policy Association establishment process, and the PDU session policy information includes wireless access priority information.
  • Step 909 SMF selects UPF.
  • step 910 the SMF sends an N4 session establishment request to the UPF, and accordingly, the UPF can receive the N4 session establishment request.
  • the N4 session establishment request carries an uplink forwarding rule
  • the uplink forwarding rule includes an N4 session identifier, message detection information, etc.
  • the uplink forwarding rule is used to instruct the UPF to process the uplink message according to the rule.
  • the UPF returns an N4 session establishment response to the SMF, and the N4 session establishment response carries CN accompanying information.
  • step 911 the SMF sends a first request (such as Namf_Communication_N1N2MessageTransfer request) to the AMF, and accordingly, the SMF can receive the first request.
  • a first request such as Namf_Communication_N1N2MessageTransfer request
  • the first request carries the PDU session identifier, N2 SM information, and N1 SM information.
  • the N2 SM information includes parameters such as CN tunnel information, QFI, 5G QoS identifier (5G QoS Identifier, 5QI), and wireless access priority information in step 910.
  • N1 The SM information includes a session establishment acceptance message.
  • the MN sends the capability indication information of the MN to the SMF, and the capability indication information may be NR-EUTRA, NR-NR or EUTRA-NR.
  • the capability indication information may indicate that it supports NR-EUTRA or NR-NR; if the MN is EUTRA, the capability indication information may indicate that it supports EUTRA-NR. If the capability indication information indicates that DCs of two different access network types are supported, the SMF includes the wireless access priority information of the above-mentioned QoS flow in the first request.
  • step 911a the AMF sends a first response (such as Namf_Communication_N1N2MessageTransfer response) to the SMF, and accordingly, the SMF can receive the first response.
  • a first response such as Namf_Communication_N1N2MessageTransfer response
  • step 912 the AMF sends an N2 session request to the MN, and accordingly, the MN can receive the N2 session request.
  • the N2 session request carries the NAS message and the N2 SM information in step 911.
  • the NAS message includes the PDU session identifier and the N1 SM information in step 911.
  • Step 912a the MN determines the PDU session transmission path according to the wireless access priority information of the QoS flow.
  • the MN determines that the core network side establishes a user plane link with the MN.
  • the MN determines that the core network side establishes a user plane link with the SN.
  • the MN determines that there is no need to establish a DC, that is, there is no need to insert an SN, and the MN determines the core network side Establish a user plane link with the MN.
  • the MN determines that the DC needs to be established, that is, the SN needs to be inserted, and the MN determines that the core network side and The newly created SN establishes a user plane link.
  • the SN insertion process can reuse the existing process.
  • the MN determines that the core network side establishes a user plane link with the AN corresponding to the wireless access type with a lower priority.
  • Any subsequent QoS flow for the PDU session is preferentially transmitted on the user plane link established above.
  • Step 913 The MN initiates a wireless connection establishment process with the UE. In this process, the MN sends a NAS message to the UE.
  • step 914 the MN sends an N2 session response to the AMF, and accordingly, the SMF can receive the N2 session response.
  • the N2 session response carries the PDU session identifier and N2 SM information.
  • the N2 SM information carries AN tunnel information.
  • Step 915 SMF establishes a user plane connection between AN and UPF.
  • the AN here refers to the AN corresponding to the PDU session transmission path determined in step 912a, that is, MN or SN.
  • the specific process includes the following:
  • Nsmf_PDUSession_UpdateSMContext Request to SMF, carrying N2 SM information in step 914.
  • the SMF sends an N4 session modification request to the UPF, carrying the downlink forwarding rule and the AN tunnel information in step 915.
  • the downlink forwarding rule includes the N4 session identifier, message detection information, etc.
  • the downlink forwarding rule is used to instruct the UPF to process the downlink message according to the rule.
  • This embodiment provides a method for wireless access selection with PDU session granularity.
  • the core network provides wireless access priority information according to the needs of the DNN, so that the MN selects the wireless access type according to the wireless access priority information provided by the core network. This ensures that different PDU sessions use wireless access technology on demand.
  • the 5QI and the wireless access priority information corresponding to the 5QI are pre-configured on the wireless access network.
  • the radio access priority information corresponding to 5QI and 5QI can be pre-configured on the radio access network, thereby according to the radio access priority corresponding to 5QI Information, determine the wireless access priority information of the QoS flow.
  • the QoS attribute value of the QoS flow is obtained, and the wireless access priority information of the QoS flow is determined according to the pre-configured QoS attribute value and the wireless access priority information corresponding to the QoS attribute value.
  • the 5QI here can be a standard 5QI, or a pre-configured 5QI, or a dynamic QoS attribute value, and each attribute value can be a range value.
  • the method includes the following steps:
  • step 1000 the MN determines to migrate the QoS flow to the SN according to the 5QI and the pre-configuration information.
  • the pre-configuration information includes 5QI and wireless access priority information corresponding to the 5QI.
  • the MN determines that the radio access technology with high priority (that is, preferential use) indicated by the radio access priority information corresponding to the 5QI is different from the radio access technology corresponding to the MN, and it is determined that the QoS needs to be changed.
  • the flow is migrated to SN. This triggers the process of inserting SN.
  • the pre-configuration information may also include QoS attribute values and wireless access priority information corresponding to the QoS attribute values.
  • the MN can also determine to migrate the QoS flow to the SN according to the QoS attribute value and pre-configuration information. That is, according to the QoS attribute value and the pre-configuration information, the MN determines that the wireless access technology with high priority (that is, preferential use) indicated by the wireless access priority information corresponding to the QoS attribute value is different from the wireless access technology corresponding to the MN, then Determine the need to migrate QoS flows to SN. This triggers the process of inserting SN.
  • Steps 1001 to 1012 are the same as steps 401 to 412 in the embodiment of FIG. 4, and reference may be made to the foregoing description.
  • the MN selects the SN according to the pre-configuration information and The corresponding QoS flow is migrated to the SN, so that the MN can select the wireless access network as needed as possible.
  • each network element described above includes hardware structures and/or software modules corresponding to each function.
  • the present invention can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed by hardware or computer software-driven hardware depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered as going beyond the scope of the present invention.
  • the device 1100 may exist in the form of software or hardware.
  • the apparatus 1100 may include: a communication unit 1101 and a processing unit 1102.
  • the communication unit 1101 may include a receiving unit and a sending unit.
  • the processing unit 1102 is used to control and manage the actions of the device 1100.
  • the communication unit 1101 is used to support communication between the device 1100 and other network entities.
  • the processing unit 1102 may be a processor or a controller, for example, a general-purpose central processing unit (CPU), a general-purpose processor, a digital signal processing (digital signal processing, DSP), and an application specific integrated circuit (application specific integrated circuit). circuits, ASIC), field programmable gate array (FPGA) or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute various exemplary logical blocks, modules, and circuits described in conjunction with the disclosure of this application.
  • the processor may also be a combination for realizing computing functions, for example, including a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and so on.
  • the communication unit 1101 is an interface circuit of the device for receiving signals from other devices or sending information to other devices.
  • the communication unit 1101 is an interface circuit used by the chip to receive signals from other chips or devices, and/or an interface circuit used to send signals to other chips or devices.
  • the apparatus 1100 may be the session management network element and the access network device in the foregoing embodiment, and may also be a chip used for the session management network element and the access network device.
  • the processing unit 1102 may be, for example, a processor
  • the communication unit 1101 may be, for example, a transmitter and/or a receiver.
  • the transmitter and receiver may include radio frequency circuits
  • the storage unit may be, for example, a memory.
  • the processing unit 1102 may be, for example, a processor, and the communication unit 1101 may be, for example, an input/output interface, a pin, or a circuit.
  • the processing unit 1102 can execute computer-executable instructions stored in the storage unit.
  • the storage unit is a storage unit in the chip, such as a register, a cache, etc., and the storage unit can also be the session management network element or the access network.
  • the storage unit outside the chip in the device such as read-only memory (ROM) or other types of static storage devices that can store static information and instructions, random access memory (RAM), etc. .
  • the device may be the session management network element in the above embodiment, then:
  • the processing unit 1102 is used to determine the wireless access priority information of the QoS flow, and the wireless access priority information of the QoS flow is used to indicate the priority of the wireless access technology used by the QoS flow Communication unit 1101, configured to send wireless access priority information of the QoS flow to an access network device, and the wireless access priority information of the QoS flow is used by the access network device to determine the establishment of the QoS The wireless access technology used by the stream.
  • the processing unit 1102 is specifically configured to determine the wireless access priority information of the QoS flow according to the wireless access priority information of the service received from the policy control network element, and the The QoS flow is used to transmit the service.
  • the communication unit 1101 is further configured to receive first information from the access network device, where the first information indicates downlink tunnel information of the access network, and the access network
  • the downlink tunnel information is used to indicate the downlink tunnel information corresponding to the QoS flow
  • the access network downlink tunnel information is the access network corresponding to the preferred radio access technology indicated by the radio access priority information of the QoS flow Downlink tunnel information of the device; and, sending the access network downlink tunnel information to the user plane network element.
  • the communication unit 1101 is further configured to send core network uplink tunnel information to the access network device.
  • the processing unit 1102 is specifically configured to obtain second information.
  • the second information is the DNN or subscription information of the session of the terminal device, and the QoS flow is the QoS flow of the session. ; Determine the wireless access priority information of the QoS flow according to the wireless access priority information corresponding to the second information.
  • the communication unit 1101 is used to send wireless access priority information of the QoS flow to the access network device, specifically including: used to send N2 session management information to the access network device
  • the N2 session management information includes wireless access priority information of the QoS flow.
  • the communication unit 1101 is further configured to receive capability indication information from the access network device, where the capability indication information is used to indicate that dual connectivity is supported; the processing unit 1102 further uses And determining the wireless access priority information for sending the QoS flow to the access network device according to the capability indication information.
  • the radio access technology used by the QoS flow is EUTRA or NR.
  • the communication unit 1101 is configured to receive service wireless access priority information from the policy control network element, and the wireless access priority information of the service is used to indicate the wireless access used by the service.
  • the priority of the access technology the processing unit 1102 is configured to determine third information according to the wireless access priority information of the service, where the third information is access network tunnel information or indication information, and the indication information It is used to indicate the radio access technology information selected for use; the communication unit 1101 is also used to send the third information to the first access network device.
  • the first access network device is the main access network device, and the second access network device is the auxiliary access network device;
  • the third information is the first access technology Access network tunnel information of the network access device; or, when the wireless access technology of the service indicated by the wireless access priority information of the service is the wireless access technology corresponding to the second access network device , The third information is the access network tunnel information of the second access network device; or,
  • the third information is the indication information
  • the indication information is used to indicate that the selected radio access technology information is the radio access technology information corresponding to the first access network device; or, when the radio access priority information of the service indicates the service
  • the radio access technology to be used preferentially is the radio access technology corresponding to the second access network device
  • the third information is the indication information
  • the indication information is used to indicate that the selected radio access technology information is Radio access technology information corresponding to the second access network device.
  • the third information is the indication information .
  • the indication information is used to indicate that the selected radio access technology information is the radio access technology information corresponding to the first access network device;
  • the third information is the indication
  • the indication information is used to indicate that the radio access technology information selected for use is target radio access technology information, and the target radio access technology information is different from the radio access technology information corresponding to the first access network device. the same.
  • the information of the wireless access technology selected for use is the wireless access technology selected for use or path information corresponding to the wireless access technology selected for use.
  • the device may also be the access network device in the above-mentioned embodiment.
  • the processing unit 1102 is configured to determine the wireless access priority information of the quality of service QoS flow, and the wireless access priority information of the QoS flow is used To indicate the priority of the wireless access technology used by the QoS flow; and determine the wireless access technology used to establish the QoS flow according to the wireless access priority information of the QoS flow.
  • the processing unit 1102 is further configured to: determine that the radio access technology used by the QoS flow is the same as the radio access technology corresponding to the first access network device, then it is determined that The first access network device establishes the QoS flow; or, if the determined radio access technology used by the QoS flow is different from the radio access technology corresponding to the first access network device, it is determined that the second access The network device establishes the QoS flow; the first access network device and the second access network device are respectively a primary access network device and a secondary access network device in a dual connectivity scenario.
  • the communication unit 1101 is configured to send first information to the session management network element, where the first information indicates the access network downlink tunnel information, and the access network downlink tunnel information uses
  • the access network downlink tunnel information is the downlink tunnel of the access network device corresponding to the radio access technology indicated by the radio access priority information of the QoS flow information.
  • the communication unit 1101 is further configured to receive core network uplink tunnel information from the session management network element.
  • the processing unit 1102 is configured to determine the wireless access priority information of the QoS flow, which specifically includes: receiving the wireless access of the QoS flow from the session management network element through the communication unit 1101; Incoming priority information; or, obtaining the 5G QoS identifier 5QI or QoS attribute value of the QoS flow through the communication unit 1101, and according to the wireless access priority information corresponding to the 5QI or the wireless access priority information corresponding to the QoS attribute value
  • the access priority information determines the wireless access priority information of the QoS flow.
  • the radio access technology used by the QoS flow is EUTRA or NR.
  • the apparatus 1100 is a session management network element or an access network device
  • the session management network element and the access network device are presented in the form of dividing each functional module in an integrated manner.
  • the "module” here may refer to a specific ASIC, a circuit, a processor and memory that executes one or more software or firmware programs, an integrated logic circuit, and/or other devices that can provide the above-mentioned functions.
  • the session management network element and the access network device can adopt the form shown in FIG. 12.
  • the processor 1202 in FIG. 12 may invoke the computer execution instructions stored in the memory 1201 to make the session management network element and the access network device execute the method in the foregoing method embodiment.
  • the functions/implementation process of the communication unit 1101 and the processing unit 1102 in FIG. 11 may be implemented by the processor 1202 in FIG. 12 calling a computer execution instruction stored in the memory 1201.
  • the function/implementation process of the processing unit 1102 in FIG. 11 may be implemented by the processor 1202 in FIG. 12 calling computer execution instructions stored in the memory 1201
  • the function/implementation process of the communication unit 1101 in FIG. 11 may be implemented as shown in FIG. 12 in the communication interface 1203 to achieve.
  • the function/implementation process of the communication unit 1101 may also be implemented through pins or circuits.
  • the device may be the session management network element or the access network device in the foregoing embodiment.
  • the device 1200 includes a processor 1202 and a communication interface 1203.
  • the device 1200 may further include a memory 1201.
  • the apparatus 1200 may further include a communication line 1204.
  • the communication interface 1203, the processor 1202, and the memory 1201 may be connected to each other through a communication line 1204;
  • the communication line 1204 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (extended industry standard architecture). , Referred to as EISA) bus and so on.
  • the communication line 1204 can be divided into an address bus, a data bus, a control bus, and so on. For ease of representation, only one thick line is used in FIG. 12 to represent it, but it does not mean that there is only one bus or one type of bus.
  • the processor 1202 may be a CPU, a microprocessor, an ASIC, or one or more integrated circuits used to control the execution of the program of the present application.
  • the communication interface 1203 uses any device such as a transceiver to communicate with other devices or communication networks, such as Ethernet, radio access network (RAN), wireless local area networks (WLAN), Wired access network, etc.
  • RAN radio access network
  • WLAN wireless local area networks
  • Wired access network etc.
  • the memory 1201 may be a ROM or other types of static storage devices that can store static information and instructions, RAM or other types of dynamic storage devices that can store information and instructions, or an electrically erasable programmable read-only memory (electrically erasable programmable read-only memory).
  • read-only memory EEPROM
  • compact disc read-only memory, CD-ROM
  • optical disc storage including compact discs, laser discs, optical discs, digital universal discs, Blu-ray discs, etc.
  • magnetic disks A storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program codes in the form of instructions or data structures and that can be accessed by a computer, but is not limited thereto.
  • the memory can exist independently and is connected to the processor through the communication line 1204. The memory can also be integrated with the processor.
  • the communication interface 1203 is used to receive and transmit code instructions to the processor 1202, and the processor 1202 controls execution, so as to implement the communication method provided by the above method embodiment of the present application.
  • the code instruction may come from the memory 1201, or it may be obtained from other places.
  • the memory 1201 is used to store computer execution instructions for executing the solution of the present application, and the processor 1202 controls the execution.
  • the processor 1202 is configured to execute computer-executable instructions stored in the memory 1201, so as to implement the communication method provided in the foregoing embodiment of the present application.
  • the function/implementation process of the communication interface 1203 can also be implemented through pins or circuits.
  • the memory may be a storage unit in the chip, such as a register, a cache, and the like.
  • the memory may also be a storage unit located outside the chip.
  • the computer-executable instructions in the embodiments of the present application may also be referred to as application program codes, which are not specifically limited in the embodiments of the present application.
  • At least one refers to any combination of these items, including any combination of a single item (a) or a plurality of items (a).
  • at least one (piece, species) of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or Multiple.
  • Multiple refers to two or more than two, and other quantifiers are similar.
  • a device means to one or more such devices.
  • the computer may be implemented in whole or in part by software, hardware, firmware, or any combination thereof.
  • software it can be implemented in the form of a computer program product in whole or in part.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium.
  • the computer instructions may be transmitted from a website, computer, server, or data center.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or a data center integrated with one or more available media.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, and a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (SSD)).
  • the various illustrative logic units and circuits described in the embodiments of this application can be implemented by general-purpose processors, digital signal processors, application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, Discrete gates or transistor logic, discrete hardware components, or any combination of the above are designed to implement or operate the described functions.
  • the general-purpose processor may be a microprocessor.
  • the general-purpose processor may also be any traditional processor, controller, microcontroller, or state machine.
  • the processor can also be implemented by a combination of computing devices, such as a digital signal processor and a microprocessor, multiple microprocessors, one or more microprocessors combined with a digital signal processor core, or any other similar configuration. achieve.
  • the steps of the method or algorithm described in the embodiments of the present application can be directly embedded in hardware, a software unit executed by a processor, or a combination of the two.
  • the software unit can be stored in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM or any other storage medium in the art.
  • the storage medium may be connected to the processor, so that the processor can read information from the storage medium, and can store and write information to the storage medium.
  • the storage medium may also be integrated into the processor.
  • the processor and the storage medium can be arranged in the ASIC.
  • These computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operation steps are executed on the computer or other programmable equipment to produce computer-implemented processing, so as to execute on the computer or other programmable equipment.
  • the instructions provide steps for implementing the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.

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Abstract

本申请提供一种通信方法、装置及系统。该方法包括：会话管理网元确定QoS流的无线接入优先级信息，该无线接入优先级信息用于指示QoS流使用的无线接入技术的优先级；会话管理网元向接入网设备发送QoS流的无线接入优先级信息，该无线接入优先级信息用于接入网设备确定建立QoS流所使用的无线接入技术。基于该方案，会话管理网元确定QoS流的无线接入优先级信息，然后向接入网设备发送该QoS流的无线接入优先级信息，从而接入网设备可以根据QoS流无线接入优先级信息确定建立QoS流所使用的无线接入技术，实现了根据QoS流的无线接入优先级信息动态选择无线接入技术，因而较为灵活。

Description

一种通信方法、装置及系统 技术领域
本申请涉及移动通信技术领域，尤其涉及一种通信方法、装置及系统。
背景技术
终端设备可以通过接入网节点与网络侧进行业务的传输，包括上行传输和下行传输。其中，一个接入网节点可以使用一种或多种不同的无线接入技术。
在目前技术中，一般是通过预先配置的方式，为一个接入网节点预配置使用的无线接入技术，即一个接入网节点上的业务均使用同一种无线接入技术进行传输，因而该方法不够灵活。
发明内容
本申请提供一种通信方法、装置及系统，用以实现灵活选择建立QoS流的无线接入技术。
第一方面，本申请提供一种通信方法，该方法包括：会话管理网元确定QoS流的无线接入优先级信息，所述QoS流的无线接入优先级信息用于指示所述QoS流使用的无线接入技术的优先级；所述会话管理网元向接入网设备发送所述QoS流的无线接入优先级信息，所述QoS流的无线接入优先级信息用于所述接入网设备确定建立所述QoS流所使用的无线接入技术。
基于上述方案，会话管理网元确定QoS流的无线接入优先级信息，然后向接入网设备发送该QoS流的无线接入优先级信息，从而接入网设备可以根据QoS流的无线接入优先级信息确定建立QoS流所使用的无线接入技术，实现了根据QoS流的无线接入优先级信息动态选择无线接入技术，因而较为灵活。
在一种可能的实现方法中，所述会话管理网元确定QoS流的无线接入优先级信息，包括：所述会话管理网元根据从策略控制网元接收的业务的无线接入优先级信息，确定所述QoS流的无线接入优先级信息，所述QoS流用于传输所述业务。
在一种可能的实现方法中，所述会话管理网元接收来自所述接入网设备的第一信息，所述第一信息指示了接入网下行隧道信息，所述接入网下行隧道信息用于指示所述QoS流对应的下行隧道信息，所述接入网下行隧道信息为所述QoS流的无线接入优先级信息指示的优先使用的无线接入技术对应的接入网设备的下行隧道信息；所述会话管理网元向用户面网元发送所述接入网下行隧道信息。
在一种可能的实现方法中，所述会话管理网元向所述接入网设备发送核心网上行隧道信息。
在一种可能的实现方法中，所述会话管理网元确定QoS流的无线接入优先级信息，包括：所述会话管理网元获取第二信息，所述第二信息为终端设备的会话的DNN，所述QoS流为所述会话的QoS流；所述会话管理网元根据所述第二信息对应的无线接入优先级信息，确定所述QoS流的无线接入优先级信息。
在一种可能的实现方法中，所述会话管理网元向接入网设备发送QoS流的无线接入优先级信息，包括：所述会话管理网元向所述接入网设备发送N2会话管理信息，所述N2会话管理信息包括所述QoS流的无线接入优先级信息。
在一种可能的实现方法中，所述会话管理网元从所述接入网设备接收能力指示信息，所述能力指示信息用于指示支持双连接；所述会话管理网元根据所述能力指示信息，确定向所述接入网设备发送所述QoS流的无线接入优先级信息。
第二方面，本申请提供一种通信方法，该方法包括：会话管理网元从策略控制网元接收业务的无线接入优先级信息，所述业务的无线接入优先级信息用于指示所述业务使用的无线接入技术的优先级；所述会话管理网元根据所述业务的无线接入优先级信息，确定第三信息，所述第三信息为接入网隧道信息或指示信息，所述指示信息用于指示选择使用的无线接入技术信息；所述会话管理网元向第一接入网设备发送所述第三信息。
基于上述方案，策略控制网元确定业务的无线接入优先级信息后发送给会话管理网元，会话管理网元根据该业务的无线接入优先级信息确定第三信息并向第一接入网设备发送第三信息，即由会话管理网元确定具体使用哪种无线接入技术或确定选择的接入网隧道信息，实现了根据无线接入优先级信息动态选择无线接入技术，因而较为灵活。
在一种可能的实现方法中，在已经建立双连接的情形下，所述第一接入网设备为主接入网设备，第二接入网设备为辅接入网设备；
当所述业务的无线接入优先级信息指示的所述业务优先使用的无线接入技术为所述第一接入网设备对应的无线接入技术，所述第三信息为所述第一接入网设备的接入网隧道信息；或，当所述业务的无线接入优先级信息指示的所述业务优先使用的无线接入技术为所述第二接入网设备对应的无线接入技术，所述第三信息为所述第二接入网设备的接入网隧道信息；或者，
当所述业务的无线接入优先级信息指示的所述业务优先使用的无线接入技术为所述第一接入网设备对应的无线接入技术，所述第三信息为所述指示信息，所述指示信息用于指示选择使用的无线接入技术信息为所述第一接入网设备对应的无线接入技术信息；或，当所述业务的无线接入优先级信息指示的所述业务优先使用的无线接入技术为所述第二接入网设备对应的无线接入技术，所述第三信息为所述指示信息，所述指示信息用于指示选择使用的无线接入技术信息为所述第二接入网设备对应的无线接入技术信息。
在一种可能的实现方法中，在未建立双连接的情形下；
当所述业务的无线接入优先级信息指示的所述业务优先使用的无线接入技术与所述第一接入网设备对应的无线接入技术相同，所述第三信息为所述指示信息，所述指示信息用于指示选择使用的无线接入技术信息为所述第一接入网设备对应的无线接入技术信息；
当所述业务的无线接入优先级信息指示的所述业务优先使用的无线接入技术与所述第一接入网设备对应的无线接入技术不相同，所述第三信息为所述指示信息，所述指示信息用于指示选择使用的无线接入技术信息为目标无线接入技术信息，所述目标无线接入技术信息与所述第一接入网设备对应的无线接入技术信息不相同。
在一种可能的实现方法中，所述选择使用的无线接入技术信息为选择使用的无线接入技术或选择使用的无线接入技术对应的路径信息。
第三方面，本申请提供一种通信方法，该方法包括：第一接入网设备确定服务质量QoS流的无线接入优先级信息，所述QoS流的无线接入优先级信息用于指示所述QoS流使用 的无线接入技术的优先级；所述第一接入网设备根据所述QoS流的无线接入优先级信息，确定建立所述QoS流所使用的无线接入技术。
基于上述方案，第一接入网设备确定QoS流的无线接入优先级信息，并根据无线接入优先级信息确定传输QoS流所使用的无线接入技术，实现了根据QoS流的无线接入优先级信息动态选择无线接入技术，因而较为灵活。
在一种可能的实现方法中，所述第一接入网设备确定的所述QoS流所使用的无线接入技术与所述第一接入网设备对应的无线接入技术相同，则所述第一接入网设备确定由所述第一接入网设备建立所述QoS流；或者，所述第一接入网设备确定的所述QoS流所使用的无线接入技术与所述第一接入网设备对应的无线接入技术不相同，则所述第一接入网设备确定由第二接入网设备建立所述QoS流；所述第一接入网设备和所述第二接入网设备分别为双连接场景中的主接入网设备和辅接入网设备。
在一种可能的实现方法中，所述第一接入网设备向会话管理网元发送第一信息，所述第一信息指示了接入网下行隧道信息，所述接入网下行隧道信息用于指示所述QoS流对应的下行隧道信息，所述接入网下行隧道信息为所述QoS流的无线接入优先级信息指示的优先使用的无线接入技术对应的接入网设备的下行隧道信息。
在一种可能的实现方法中，所述第一接入网设备从所述会话管理网元接收核心网上行隧道信息。
在一种可能的实现方法中，所述第一接入网设备确定QoS流的无线接入优先级信息，包括：所述第一接入网设备从会话管理网元接收所述QoS流的无线接入优先级信息；或者，所述第一接入网设备获取所述QoS流的5G QoS标识5QI或QoS属性值，根据所述5QI对应的无线接入优先级信息、或所述QoS属性值对应的无线接入优先级信息，确定所述QoS流的无线接入优先级信息。
基于上述第一方面至第三方面中的任一实施例：
在一种可能的实现方法中，在一种可能的实现方法中，所述QoS流使用的无线接入技术为EUTRA或NR。
第四方面，本申请提供一种通信装置，该装置可以是会话管理网元，还可以是用于会话管理网元的芯片。该装置具有实现上述第一方面或第一方面的各实施例、第二方面或第二方面的各实施例的功能。该功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的模块。
第五方面，本申请提供一种通信装置，该装置可以是接入网设备，还可以是用于接入网设备的芯片。该装置具有实现上述第三方面或第三方面的各实施例的功能。该功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的模块。
第六方面，本申请提供一种通信装置，包括处理器和存储器；该存储器用于存储计算机执行指令，当该装置运行时，该处理器执行该存储器存储的该计算机执行指令，以使该装置执行如上述各方面或各方面的各实施例的方法。
第七方面，本申请提供一种通信装置，包括用于执行上述各方面或各方面的各个步骤的单元或手段(means)。
第八方面，本申请提供一种通信装置，包括处理器和接口电路，所述处理器用于通过接口电路与其它装置通信，并执行上述各方面或各方面的各实施例的方法。该处理器包括 一个或多个。
第九方面，本申请提供一种通信装置，包括处理器，用于与存储器相连，用于调用所述存储器中存储的程序，以执行上述各方面或各方面的各实施例的方法。该存储器可以位于该装置之内，也可以位于该装置之外。且该处理器包括一个或多个。
第十方面，本申请还提供一种计算机可读存储介质，所述计算机可读存储介质中存储有指令，当其在计算机上运行时，使得处理器执行上述各方面或各方面的各实施例所述的方法。
第十一方面，本申请还提供一种包括指令的计算机程序产品，当其在计算机上运行时，使得计算机执行上述各方面或各方面的各实施例所述的方法。
第十二方面，本申请还提供一种芯片系统，包括：处理器，用于执行上述各方面或各方面的各实施例所述的方法。
第十三方面，本申请提供一种通信系统，包括会话管理网元和接入网设备；所述会话管理网元，用于确定QoS流的无线接入优先级信息，所述QoS流的无线接入优先级信息用于指示所述QoS流使用的无线接入技术的优先级；以及，向所述接入网设备发送QoS流的无线接入优先级信息；所述接入网设备，用于根据所述QoS流的无线接入优先级信息，确定建立所述QoS流所使用的无线接入技术。
第十四方面，本申请提供一种通信系统，包括会话管理网元和策略控制网元；所述策略控制网元，用于向所述会话管理网元发送业务的无线接入优先级信息，所述业务的无线接入优先级信息用于指示所述业务使用的无线接入技术的优先级；所述会话管理网元，用于根据所述业务的无线接入优先级信息，确定第三信息，所述第三信息为接入网隧道信息或指示信息，所述指示信息用于指示选择使用的无线接入技术信息；以及，向第一接入网设备发送所述第三信息。
第十五方面，本申请提供一种通信系统，包括会话管理网元和第一接入网设备；第一接入网设备，用于确定QoS流的无线接入优先级信息，所述QoS流的无线接入优先级信息用于指示所述QoS流使用的无线接入技术的优先级；以及，根据所述QoS流的无线接入优先级信息，确定建立所述QoS流所使用的无线接入技术；会话管理网元，用于从所述第一接入网设备接收第一信息，所述第一信息指示了接入网下行隧道信息，所述接入网下行隧道信息用于指示所述QoS流对应的下行隧道信息，所述接入网下行隧道信息为所述QoS流的无线接入优先级信息指示的优先使用的无线接入技术对应的接入网设备的下行隧道信息。
第十六方面，本申请提供一种通信方法，包括：会话管理网元确定QoS流的无线接入优先级信息，所述QoS流的无线接入优先级信息用于指示所述业务使用的无线接入技术的优先级；会话管理网元向接入网设备发送QoS流的无线接入优先级信息，所述QoS流的无线接入优先级信息用于所述接入网设备确定建立所述QoS流所使用的无线接入技术；接入网设备根据所述QoS流的无线接入优先级信息，确定建立所述QoS流所使用的无线接入技术。
第十七方面，本申请提供一种通信方法，包括：会话管理网元从策略控制网元接收业务的无线接入优先级信息，所述业务的无线接入优先级信息用于指示所述业务使用的无线接入技术的优先级；所述会话管理网元根据所述业务的无线接入优先级信息，确定第三信息，所述第三信息为接入网隧道信息或指示信息，所述指示信息用于指示选择使用的无线 接入技术；所述会话管理网元向第一接入网设备发送所述第三信息。接入网设备从所述会话管理网元接收所述第三信息。
第十八方面，本申请提供一种通信方法，包括：第一接入网设备确定QoS流的无线接入优先级信息，所述QoS流的无线接入优先级信息用于指示所述QoS流使用的无线接入技术的优先级；第一接入网设备根据所述QoS流的无线接入优先级信息，确定建立所述QoS流所使用的无线接入技术；会话管理网元从所述第一接入网设备接收第一信息，所述第一信息指示了接入网下行隧道信息，所述接入网下行隧道信息用于指示所述QoS流对应的下行隧道信息，所述接入网下行隧道信息为所述QoS流的无线接入优先级信息指示的优先使用的无线接入技术对应的接入网设备的下行隧道信息。
附图说明
图1A为本申请提供的一种通信系统示意图；
图1B为本申请提供的又一种通信系统示意图；
图2A为基于服务化架构的5G网络架构示意图；
图2B为基于点对点接口的5G网络架构示意图；
图3为3GPP定义了的双连接架构；
图4为现有技术中的插入SN时的无线网侧的流程示意图；
图5为现有技术中的插入SN时的核心网侧的流程示意图；
图6A为本申请提供的一种通信方法流程示意图；
图6B为本申请提供的又一种通信方法流程示意图；
图7为本申请提供的又一种通信方法流程示意图；
图8为本申请提供的又一种通信方法流程示意图；
图9为本申请提供的又一种通信方法流程示意图；
图10为本申请提供的又一种通信方法流程示意图；
图11为本申请提供的一种通信装置示意图；
图12为本申请提供的又一种通信装置示意图。
具体实施方式
为了使本申请的目的、技术方案和优点更加清楚，下面将结合附图对本申请作进一步地详细描述。方法实施例中的具体操作方法也可以应用于装置实施例或系统实施例中。其中，在本申请的描述中，除非另有说明，“多个”的含义是两个或两个以上。
为解决背景技术中提到的问题，如图1A所示，本申请提供一种通信系统，该系统包括会话管理网元和接入网设备。可选的，所述系统还包括策略控制网元。针对图1A的系统，有两种方案。
第一种方案：
所述会话管理网元，用于确定服务质量(Quality of Service，QoS)流的无线接入优先级信息，所述QoS流的无线接入优先级信息用于指示所述QoS流使用的无线接入技术的优先级；以及，向所述接入网设备发送QoS流的无线接入优先级信息；所述接入网设备，用于根据所述QoS流的无线接入优先级信息，确定建立所述QoS流所使用的无线接入技 术。
在一种可能的实现方法中，策略控制网元，用于从应用功能网元接收业务的无线接入倾向信息，所述无线接入倾向信息用于指示所述业务倾向使用的无线接入技术的优先级；根据所述无线接入倾向信息，确定所述业务的无线接入优先级信息；或者，用于根据所述业务的签约信息和/或所述业务对应于不同无线接入技术的业务体验信息，确定所述业务的无线接入优先级信息；所述会话管理网元，用于确定QoS流的无线接入优先级信息，具体包括：用于根据从所述策略控制网元接收的所述业务的无线接入优先级信息，确定所述QoS流的无线接入优先级信息，所述QoS流用于传输所述业务。
在一种可能的实现方法中，所述策略控制网元，还用于从所述会话管理网元接收能力指示信息，所述能力指示信息用于指示支持双连接；根据所述能力指示信息，确定向所述会话管理网元发送所述业务的无线接入优先级信息。
在一种可能的实现方法中，所述会话管理网元，还用于接收来自所述接入网设备的第一信息，所述第一信息指示了接入网下行隧道信息，所述接入网下行隧道信息用于指示所述QoS流对应的下行隧道信息，所述接入网下行隧道信息为所述QoS流的无线接入优先级信息指示的优先使用的无线接入技术对应的接入网设备的下行隧道信息；向用户面网元发送所述接入网下行隧道信息。
在一种可能的实现方法中，所述会话管理网元，还用于向所述接入网设备发送核心网上行隧道信息。
在一种可能的实现方法中，所述会话管理网元，用于确定QoS流的无线接入优先级信息，具体包括：用于获取第二信息，所述第二信息为终端设备的会话的数据网名称(Data Network Name，DNN)，所述QoS流为所述会话的QoS流；以及，根据所述第二信息对应的无线接入优先级信息，确定所述QoS流的无线接入优先级信息。
在一种可能的实现方法中，所述会话管理网元，用于向所述接入网设备发送QoS流的无线接入优先级信息，具体包括：用于向所述接入网设备发送N2会话管理信息，所述N2会话管理信息包括所述QoS流的无线接入优先级信息。
在一种可能的实现方法中，所述QoS流使用的无线接入技术为演进的统一陆地无线接入(Evolved Universal Terrestrial Radio Access，EUTRA)或新无线电(New radio，NR)。
第二种方案：
图1A所示的接入网设备也可以称为第一接入网设备，第一接入网设备，用于确定QoS流的无线接入优先级信息，所述QoS流的无线接入优先级信息用于指示所述QoS流使用的无线接入技术的优先级；根据所述QoS流的无线接入优先级信息，确定建立所述QoS流所使用的无线接入技术。会话管理网元，用于从第一接入网设备接收第一信息，所述第一信息指示了接入网下行隧道信息，所述接入网下行隧道信息用于指示所述QoS流对应的下行隧道信息，所述接入网下行隧道信息为所述QoS流的无线接入优先级信息指示的优先使用的无线接入技术对应的接入网设备的下行隧道信息。
在一种可能的实现方法中，所述第一接入网设备，还用于从所述会话管理网元接收核心网上行隧道信息。
在一种可能的实现方法中，所述第一接入网设备，用于确定QoS流的无线接入优先级信息，具体包括：从会话管理网元接收所述QoS流的无线接入优先级信息；或者，获取所述QoS流的5G QoS标识(5G QoS Identifier，5QI)，根据所述5QI对应的无线接入优先级 信息，确定所述QoS流的无线接入优先级信息；或者，获取所述QoS流的QoS属性值，根据QoS属性值对应的无线接入优先级信息的对应关系，确定所述QoS流的无线接入优先级信息。
在一种可能的实现方法中，第一接入网设备，还用于所述第一接入网设备确定的所述QoS流所使用的无线接入技术与所述第一接入网设备对应的无线接入技术相同，则确定由所述第一接入网设备建立所述QoS流；或者，所述第一接入网设备确定的所述QoS流所使用的无线接入技术与所述第一接入网设备对应的无线接入技术不相同，则确定由第二接入网设备建立所述QoS流；所述第一接入网设备和所述第二接入网设备分别为双连接场景中的主接入网设备和辅接入网设备。
为解决背景技术中提到的问题，如图1B所示，本申请提供又一种通信系统，该系统包括会话管理网元和策略控制网元。可选的，所述系统还包括接入网设备(该接入网设备也可以称为第一接入网设备)。
所述策略控制网元，用于向所述会话管理网元发送业务的无线接入优先级信息，所述业务的无线接入优先级信息用于指示所述业务使用的无线接入技术的优先级；所述会话管理网元，用于根据所述业务的无线接入优先级信息，确定第三信息，所述第三信息为接入网隧道信息或指示信息，所述指示信息用于指示选择使用的无线接入技术信息；以及，向第一接入网设备发送所述第三信息。
在一种可能的实现方法中，在已经建立双连接的情形下，所述第一接入网设备为主接入网设备，第二接入网设备为辅接入网设备；
当所述业务的无线接入优先级信息指示的所述业务优先使用的无线接入技术为所述第一接入网设备对应的无线接入技术，所述第三信息为所述第一接入网设备的接入网隧道信息；或，当所述业务的无线接入优先级信息指示的所述业务优先使用的无线接入技术为所述第二接入网设备对应的无线接入技术，所述第三信息为所述第二接入网设备的接入网隧道信息；或者，
当所述业务的无线接入优先级信息指示的所述业务优先使用的无线接入技术为所述第一接入网设备对应的无线接入技术，所述第三信息为所述指示信息，所述指示信息用于指示选择使用的无线接入技术信息为所述第一接入网设备对应的无线接入技术信息；或，当所述业务的无线接入优先级信息指示的所述业务优先使用的无线接入技术为所述第二接入网设备对应的无线接入技术，所述第三信息为所述指示信息，所述指示信息用于指示选择使用的无线接入技术信息为所述第二接入网设备对应的无线接入技术信息。
在一种可能的实现方法中，在未建立双连接的情形下；
当所述业务的无线接入优先级信息指示的所述业务优先使用的无线接入技术与所述第一接入网设备对应的无线接入技术相同，所述第三信息为所述指示信息，所述指示信息用于指示选择使用的无线接入技术信息为所述第一接入网设备对应的无线接入技术信息；
当所述业务的无线接入优先级信息指示的所述业务优先使用的无线接入技术与所述第一接入网设备对应的无线接入技术不相同，所述第三信息为所述指示信息，所述指示信息用于指示选择使用的无线接入技术信息为目标无线接入技术信息，所述目标无线接入技术信息与所述第一接入网设备对应的无线接入技术信息不相同。
在一种可能的实现方法中，所述策略控制网元，还用于从应用功能网元接收所述业务 的无线接入倾向信息，所述无线接入倾向信息用于指示所述业务倾向使用的无线接入技术的优先级；根据所述无线接入倾向信息，确定所述业务的无线接入优先级信息；或者，用于根据所述业务的签约信息和/或所述业务对应于不同无线接入技术的业务体验信息，确定所述业务的无线接入优先级信息。
在一种可能的实现方法中，所述选择使用的无线接入技术信息为选择使用的无线接入技术或选择使用的无线接入技术对应的路径信息。
如图2A所示，为基于服务化架构的第五代(5th generation，5G)网络架构示意图。图2A所示的5G网络架构中可包括三部分，分别是终端设备部分、数据网络(data network，DN)和运营商网络部分。下面对其中的部分网元的功能进行简单介绍说明。
其中，运营商网络可包括以下网元中的一个或多个：网络开放功能(network exposure function，NEF)网元、策略控制功能(policy control function，PCF)网元、统一数据管理(unified data management，UDM)网元、网络存储功能(Network Repository Function，NRF)网元、应用功能(application function，AF)网元、接入与移动性管理功能(access and mobility management function，AMF)网元、会话管理功能(session management function，SMF)网元、无线接入网(radioaccess network，RAN)以及用户面功能(user plane function，UPF)网元等。上述运营商网络中，除无线接入网部分之外的部分可以称为核心网络部分。
终端设备(terminal device)，也可以称为用户设备(user equipment，UE)，是一种具有无线收发功能的设备，可以部署在陆地上，包括室内或室外、手持或车载；也可以部署在水面上(如轮船等)；还可以部署在空中(例如飞机、气球和卫星上等)。所述终端设备可以是手机(mobile phone)、平板电脑(pad)、带无线收发功能的电脑、虚拟现实(virtual reality，VR)终端、增强现实(augmented reality，AR)终端、工业控制(industrial control)中的无线终端、无人驾驶(self driving)中的无线终端、远程医疗(remote medical)中的无线终端、智能电网(smart grid)中的无线终端、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端、智慧家庭(smart home)中的无线终端等。
上述终端设备可通过运营商网络提供的接口(例如N1等)与运营商网络建立连接，使用运营商网络提供的数据和/或语音等服务。终端设备还可通过运营商网络访问DN，使用DN上部署的运营商业务，和/或第三方提供的业务。其中，上述第三方可为运营商网络和终端设备之外的服务方，可为终端设备提供他数据和/或语音等服务。其中，上述第三方的具体表现形式，具体可根据实际应用场景确定，在此不做限制。
RAN是运营商网络的子网络，是运营商网络中核心网节点与终端设备之间的实施系统。终端设备要接入运营商网络，首先是经过RAN，进而可通过RAN与运营商网络的业务节点连接。本申请中的RAN设备，是一种为终端设备提供无线通信功能的设备，RAN设备也称为接入网设备。本申请中的RAN设备包括但不限于：5G中的下一代基站(g nodeB，gNB)、演进型节点B(evolved node B，eNB)、无线网络控制器(radio network controller，RNC)、节点B(node B，NB)、基站控制器(base station controller，BSC)、基站收发台(base transceiver station，BTS)、家庭基站(例如，home evolved nodeB，或home node B，HNB)、基带单元(baseBand unit，BBU)、传输点(transmitting and receiving point，TRP)、发射点(transmitting point，TP)、移动交换中心等。
AMF网元，是由运营商网络提供的控制面网元，负责终端设备接入运营商网络的接入 控制和移动性管理，例如包括移动状态管理，分配用户临时身份标识，认证和授权用户等功能。
SMF网元，主要负责移动网络中的会话管理，如会话建立、修改、释放。具体功能如为用户分配IP地址、选择提供报文转发功能的UPF等。
UPF网元，负责终端设备中用户数据的转发和接收。可以从数据网络接收用户数据，通过接入网设备传输给终端设备；UPF网元还可以通过接入网设备从终端设备接收用户数据，转发到数据网络。UPF网元中为终端设备提供服务的传输资源和调度功能由SMF网元管理控制的。
DN，是位于运营商网络之外的网络，运营商网络可以接入多个DN，DN上可部署多种业务，可为终端设备提供数据和/或语音等服务。例如，DN是某智能工厂的私有网络，智能工厂安装在车间的传感器可为终端设备，DN中部署了传感器的控制服务器，控制服务器可为传感器提供服务。传感器可与控制服务器通信，获取控制服务器的指令，根据指令将采集的传感器数据传送给控制服务器等。又例如，DN是某公司的内部办公网络，该公司员工的手机或者电脑可为终端设备，员工的手机或者电脑可以访问公司内部办公网络上的信息、数据资源等。
UDM网元，用于生成认证信任状，用户标识处理(如存储和管理用户永久身份等)，接入授权控制和签约数据管理等
NEF网元，主要用于支持能力和事件的开放。
AF网元，主要支持与第三代合作伙伴计划(3rd generation partnership project，3GPP)核心网交互来提供服务，例如影响数据路由决策，策略控制功能或者向网络侧提供第三方的一些服务。
PCF网元，主要支持提供统一的策略框架来控制网络行为，提供策略规则给控制层网络功能，同时负责获取与策略决策相关的用户签约信息。
NRF网元，可用于提供网元发现功能，基于其他网元的请求，提供网元类型对应的网元信息。NRF还提供网元管理服务，如网元注册、更新、去注册以及网元状态订阅和推送等。
图2A中Nnef、Npcf、Nudm、Naf、Namf、Nsmf、N1、N2、N3、N4，以及N6为接口序列号。这些接口序列号的含义可参见3GPP标准协议中定义的含义，在此不做限制。
如图2B所示，为基于点对点接口的5G网络架构示意图，其中的网元的功能的介绍可以参考图2A中对应的网元的功能的介绍，不再赘述。图2B与图2A的主要区别在于：图2B中的各个网元之间的接口是点对点的接口，而不是服务化的接口。
在图2B所示的架构中，其中，UE与AMF网元之间的接口称为N1接口，AMF网元与RAN设备之间的接口称为N2接口，RAN设备与UPF网元之间的接口可以称为N3接口，SMF网元与UPF网元之间的接口称为N4接口，PCF网元与AF网元之间的接口称为N5接口，UPF网元与DN之间的接口称为N6接口，SMF网元与PCF网元之间的接口称为N7接口，AMF网元与UDM网元之间的接口称为N8接口，不同UPF网元之间的接口称为N9接口，UDM网元与SMF网元之间的接口称为N10接口，AMF网元与SMF网元之间的接口称为N11接口，不同AMF网元之间的接口称为N14接口，AMF网元与PCF网元之间的接口称为N15接口。
可以理解的是，上述网元或者功能既可以是硬件设备中的网络元件，也可以是在专用硬件上运行软件功能，或者是平台(例如，云平台)上实例化的虚拟化功能。可选的，上述网元或者功能可以由一个设备实现，也可以由多个设备共同实现，还可以是一个设备内的一个功能模块，本申请实施例对此不作具体限定。
本申请中的移动性管理网元、会话管理网元、策略控制网元、应用功能网元、接入网设备、网络开放功能网元、用户面网元分别可以是图2A或图2B中的AMF、SMF、PCF、AF、RAN、NEF、UPF，也可以是未来通信如第六代(6th generation，6G)网络中具有上述AMF、SMF、PCF、AF、RAN、NEF、UPF的功能的网元，本申请对此不限定。为方便说明，本申请以移动性管理网元、会话管理网元、策略控制网元、应用功能网元、接入网设备、网络开放功能网元、用户面网元分别为上述AMF、SMF、PCF、AF、RAN、NEF、UPF为例进行说明。并且，本申请中将终端设备简称为UE。
如图3所示，为3GPP定义了的双连接架构。UE可以同时通过两个接入网节点传输业务，其中一个接入网节点为主节点(Master Node，MN)，另一个为从节点(Secondary Node，SN)。双连接场景包含EUTRA-NR双连接(即MN为eNB，SN为gNB，其中eNB与5G核心网(5G core，5GC)建立信令面连接，如无线资源控制(Radio Resource Control，RRC)连接)、NR-EUTRA双连接(即MN为gNB，SN为eNB，其中gNB与5GC建立信令面连接)和NR-NR双连接(MN为gNB,SN也为gNB,作为MN的gNB与5GC建立信令面连接)。MN和5GC之间的控制面接口为NG-C，MN和5GC之间的用户面接口为NG-U，SN和5GC之间的用户面接口为NG-U。MN和SN之间的控制面接口为Xn-c,用户面接口为Xn-U。
需要说明的是，接入网节点也可以称为接入网设备、站点、网络设备等。本申请实施例中，DC场景中的两个接入网节点也可以分别称为主无线接入网(Master Radio Access Network，M-RAN)设备和从无线接入网(Secondary Radio Access Network，S-RAN)设备，或者还可以分别称为主站和辅站，或者还可以分别称为主网络设备站和辅网络设备。本申请后续以两个接入网节点分别称为MN和SN为例进行说明。
如图4所示，为现有技术中的插入SN时的无线网侧的流程示意图，其中，SN的插入由MN来确定。该流程包括以下步骤：
步骤401，MN确定请求SN为一个或多个特定的PDU会话或QoS流(flow)分配资源，则向SN发送SN插入请求(SN Addition Request)，相应地，SN可以接收到该SN插入请求。
该请求中包含QoS flow级别的QoS参数，PDU会话级别的传输网层(Transport Network layer，TNL)地址信息和PDU会话级别的切片信息。
步骤402，SN确定支持请求的资源，则分配对应的无线资源，然后SN向MN发送SN插入请求确认(SN Addition Request Acknowledge)消息，相应地，MN可以接收到该SN插入请求确认消息。
该消息中包含SN RRC配置消息、NG-U DL TNL地址信息和安全算法。可选的，若SN确定需要Xn-U资源，则该消息中还可以包含Xn-U DL TNL地址信息。
步骤402a，对于SN上使用主小区组(Master Cell Group，MCG)资源的终结的承载， MN可以向SN提供Xn-U DL TNL地址信息。
该步骤可选。
其中，MCG为MN上的小区构成的小区组。
步骤403，MN向UE发送MN RRC重配置消息(RRC reconfiguration message)，相应地，UE可以接收到该MN RRC重配置消息。
该消息中包含上述步骤402中的SN RRC配置消息。
步骤404，UE应用新的配置，并向MN发送MN RRC重配置完成消息(RRC reconfiguration complete message)，相应地，MN可以接收到该MN RRC重配置完成消息。
该消息中包含SN RRC响应消息。
步骤405，MN向SN发送SN重配置完成消息(SN Reconfiguration Complete message)，相应地，SN可以接收到该SN重配置完成消息。
该消息中包含SN RRC响应消息。
步骤406，如果配置的资源需要辅小区组(Secondary Cell Group，SCG)无线资源，则UE发起随机接入流程(Random Access Procedure)，UE执行同步。
该步骤可选。
其中，SCG为SN上的小区构成的小区组。
步骤407，如果终结在SN的承载使用无线链路控制(Radio Link Control，RLC)Am，则MN向SN发送SN状态传输(SN Status Transfer)。
该步骤可选。
步骤408，MN向SN发送数据包(Data Forwarding)。
步骤409至步骤412，对于终结在SN的承载，SN与5GC执行PDU会话路径更新流程。(具体的流程可参考图5)。
如图5所示，为现有技术中的插入SN时的核心网侧的流程示意图。该流程包括以下步骤：
步骤501，MN向AMF发送N2 QoS流移动指示(N2 QoS flow mobility indication)消息，相应地，AMF可以接收到该N2 QoS流移动指示消息。
该消息中包含PDU会话标识(PDU session ID)，一个或多个QoS流标识(QoS flow identity，QFI)和接入网(Access Network，AN)隧道信息。该AN隧道信息包含新的SN隧道端点。
步骤502，AMF向SMF发送PDU会话更新请求(Nsmf_PDUSession_UpdateSMContext request)消息，相应地，SMF可以接收到该PDU会话更新请求消息。
该消息中包含N2 QoS流移动指示(N2 QoS flow mobility indication)消息。
步骤503，SMF向UPF发送N4会话修改请求(N4Session modification request)消息，相应地，UPF可以接收到该N4会话修改请求消息。
该消息中包含QFI和AN隧道信息。
步骤504，UPF向SMF发送N4会话修改响应(N4Session modification response)消息，相应地，SMF可以接收到该N4会话修改响应消息。
该消息中包含CN隧道信息。该CN隧道信息为UPF的隧道信息。
步骤505，SMF向AMF发送PDU会话更新响应(Nsmf_PDUSession_UpdateSMContext  response)消息，相应地，AMF可以接收到该PDU会话更新响应消息。
该消息中包含N2 SM信息，该N2 SM信息包含CN隧道信息。
步骤506，为了协助MN和/或SN的重排序功能，对于每一个受影响的N3隧道，当QFI切换到新的隧道(即使用对应QFI的数据使用新的路径传输时)，UPF发送一个或多个结束标记(end marker)数据包。
该步骤包括以下步骤506a和/或步骤506b：
步骤506a，UPF向MN发送用于流转移到SN的结束标记数据包，MN向SN转发该用于流转移到SN的结束标记数据包。
步骤506b，UPF向SN发送用于流转移到MN的结束标记数据包，SN向MN转发该用于流转移到MN的结束标记数据包。
步骤507，AMF向MN发送N2 QoS流移动确认(N2 QoS flow mobility confirm)消息，相应地，MN可以接收到该N2 QoS流移动确认消息。
该消息中包含上述N2 SM信息。
上述现有技术中，SN的插入，以及将QoS flow的数据包放在MN还是SN上传输，都是由MN来决策。
上述现有技术存在的问题是：对于EUTRA和NR共部署的DC场景下，运营商希望根据不同的应用或业务的需求，合理有效的利用EUTRA接入资源和NR接入资源，从而保证网络投资和价值的最大化。但是现有的技术中，无线接入网不支持根据业务的价值、偏好等将业务放在不同的无线网节点上进行传输。
本申请实施例可以解决上述技术问题，以实现更加灵活、有效的使用EUTRA接入和NR接入。
下面对本申请实施例进行介绍说明。基于图1A所述的系统、或图2A、图2B所示的网络架构，如图6A所示，为本申请提供的一种通信方法流程示意图。该方法包括以下步骤：
步骤601a，SMF确定QoS流的无线接入优先级信息，QoS流的无线接入优先级信息用于指示QoS流使用的无线接入技术的优先级。
步骤602a，SMF向RAN发送QoS流的无线接入优先级信息，相应地，RAN可以接收到QoS流的无线接入优先级信息。
这里的QoS流用于传输业务。
RAN接收到QoS流的无线接入优先级信息后，根据无线接入优先级信息确定建立QoS流所使用的无线接入技术。比如，QoS流的无线接入优先级信息指示NR的优先级高于EUTRA，则RAN可以确定建立QoS流所使用的无线接入技术为NR；再比如，QoS流的无线接入优先级信息指示EUTRA的优先级高于NR，则RAN可以确定建立QoS流QoS流的所使用的无线接入技术为EUTRA。
需要说明的是，在已经建立DC的场景中，这里RAN指的是MN。
基于上述方案，SMF确定QoS流的无线接入优先级信息，然后向RAN发送该QoS流的无线接入优先级信息，从而RAN可以根据QoS流的无线接入优先级信息确定建立QoS流所使用的无线接入技术，实现了根据QoS流的无线接入优先级信息动态选择无线接入技术，因而较为灵活。
在上述方案的步骤601a中，SMF确定QoS流的无线接入优先级信息的方法包括但不 限于：
方法1，SMF从PCF接收业务的无线接入优先级信息，根据业务的确定QoS流的无线接入优先级信息。
PCF确定业务的无线接入优先级信息比如可以是：PCF从AF接收无线接入优先级倾向信息，根据无线接入优先级倾向信息确定无线接入优先级信息；或者，PCF还可以根据签约信息(比如业务策略签约信息)和/或网络数据分析功能(NetWork Data Analysis Function，NWDAF)网元提供的信息(如业务分别使用EUTRA或NR传输时的业务体验信息)确定无线接入优先级信息。比如，业务策略签约信息指示了优先选择的无线接入技术，或者是业务体验更佳的无线接入技术作为优先选择的无线接入技术。对于PCF确定无线接入优先级信息的具体实现过程，后续具体实施例中会详细说明。
需要说明的是，SMF根据业务的无线接入优先级信息确定的QoS流的无线接入优先级信息，与接收到的业务的无线接入优先级信息，在形式上可以不同，但指示的无线接入技术的优先级的大小是相同的。比如，业务的无线接入优先级信息指示NR的优先级大于EUTRA的优先级，则QoS流的无线接入优先级信息也指示NR的优先级大于EUTRA的优先级。
基于该方法1，在上述步骤602a之后，还可以包括以下步骤603a至605a：
步骤603a，RAN向SMF发送第一信息，相应地，SMF可以接收到该第一信息。
该第一信息指示了接入网下行隧道信息，接入网下行隧道信息用于指示QoS流对应的下行隧道信息，接入网下行隧道信息为QoS流的无线接入优先级信息指示的优先使用的无线接入技术对应的RAN的下行隧道信息。
该第一信息在不同场景中，可以有不同实现方法，下面分别说明。
情形1，已经建立了DC。
此时，这里的RAN指的是MN。并且，SMF上已经存储有MN的下行隧道信息和SN的下行隧道信息。
在第一种实现方法中，MN若根据QoS流的无线接入优先级信息确定的无线接入技术与MN对应的无线接入技术相同，则第一信息是MN的下行隧道信息或第一指示。MN若根据QoS流的无线接入优先级信息确定的无线接入技术与SN对应的无线接入技术相同，则第一信息是SN的下行隧道信息或第二指示。其中，第一指示是1比特信息“1”，第二指示是1比特信息“0”；或者，第一指示是1比特信息“0”，第二指示是1比特信息“1”。
在第二种实现方法中，MN若根据QoS流的无线接入优先级信息确定的无线接入技术与MN对应的无线接入技术相同，则第一信息是MN的下行隧道信息或第一指示。MN若根据QoS流的无线接入优先级信息确定的无线接入技术与SN对应的无线接入技术相同，则第一信息为空。其中，预先预定第一信息为空时，表示第一信息指示了SN的下行隧道信息。第一指示是1比特信息，比如为“1”或“0”。
在第三种实现方法中，MN若根据QoS流的无线接入优先级信息确定的无线接入技术与MN对应的无线接入技术相同，则第一信息为空。MN若根据QoS流的无线接入优先级信息确定的无线接入技术与SN对应的无线接入技术相同，则第一信息是SN的下行隧道信息或第一指示。其中，预先预定第一信息为空时，表示第一信息指示了MN的下行隧道信息。第一指示是1比特信息，比如为“1”或“0”。
情形2，未建立DC。
MN若根据QoS流的无线接入优先级信息确定的无线接入技术与MN对应的无线接入技术相同，则第一信息是MN的下行隧道信息。MN若根据QoS流的无线接入优先级信息确定的无线接入技术与MN对应的无线接入技术不相同，则MN建立DC，即插入SN，然后向SMF发送第一信息，且第一信息是SN的下行隧道信息。
步骤604a，SMF向UPF发送接入网下行隧道信息。
接入网下行隧道信息即为用户面的下行隧道信息，用于UPF向RAN发送下行数据。
步骤605a，SMF向RAN发送核心网上行隧道信息。
核心网上行隧道信息即为用户面的上行隧道信息，用于RAN向UPF发送上行数据。
通过上述步骤603a至步骤605a，可以建立用户面隧道。
需要说明的是，当第一RAN确定的QoS流所使用的无线接入技术与第一RAN对应的无线接入技术相同，则第一RAN确定由第一RAN建立QoS流。当第一RAN确定的QoS流所使用的无线接入技术与第一RAN对应的无线接入技术不相同，则第一RAN确定由第二RAN建立QoS流。
方法2，SMF获取第二信息，第二信息为UE的会话的DNN，SMF根据第二信息对应的无线接入优先级信息，确定QoS流的无线接入优先级信息。
比如，SMF上预配置或协议预定有第二信息，以及第二信息对应的无线接入优先级信息，第二信息为UE的会话的DNN。当SMF获取到第二信息后，可以根据存储的上述对应关系，确定第二信息对应的无线接入优先级信息，进而根据第二信息对应的无线接入优先级信息，确定QoS流的无线接入优先级信息。该QoS流为所述会话的QoS流。其中，可以将第二信息对应的无线接入优先级信息，作为QoS流的无线接入优先级信息，或者，也可以对第二信息对应的无线接入优先级信息换成其他表达方式，但无线接入优先级信息对应的无线接入技术的优先级顺序不变，从而得到QoS流的无线接入优先级信息。
再比如，UDM存储有第二信息，以及第二信息对应的无线接入优先级信息，则SMF还可以根据第二信息从UDM获取第二信息对应的无线接入优先级信息。进而根据第二信息对应的无线接入优先级信息，确定QoS流的无线接入优先级信息。
基于该方法2，上述步骤602a具体实现可以为：SMF向RAN发送N2会话管理信息，N2会话管理信息包括QoS流的无线接入优先级信息。
基于图1B所述的系统、或图2A、图2B所示的网络架构，如图6B所示，为本申请提供的又一种通信方法流程示意图。该方法包括以下步骤：
步骤601b，SMF从PCF接收业务的无线接入优先级信息，业务的无线接入优先级信息用于指示业务使用的无线接入技术的优先级。
步骤602b，SMF根据业务的无线接入优先级信息，确定第三信息，第三信息为接入网隧道信息或指示信息，指示信息用于指示选择使用的无线接入技术信息。
这里的选择使用的无线接入技术信息可以是选择使用的无线接入技术，或者还可以是选择使用的无线接入技术对应的路径信息。
步骤603b，SMF向第一RAN发送第三信息。相应地，第一RAN可以接收到该第三信息。
基于上述方案，PCF确定业务的无线接入优先级信息后发送给SMF，SMF根据该业务的无线接入优先级信息确定第三信息并向第一RAN发送第三信息，即由SMF确定具体 使用哪种无线接入技术或确定选择的接入网隧道信息，实现了根据业务的无线接入优先级信息动态选择无线接入技术，因而较为灵活。
下面分两种情形，说明上述第三信息的具体实现：
情形1，已经建立DC，其中，第一RAN为主RAN(即MN)，第二RAN为辅RAN(即SN)。
在第一种实现方法中，当SMF从PCF接收到的业务的无线接入优先级信息指示的业务优先使用的无线接入技术为第一RAN对应的无线接入技术，则第三信息为第一RAN的接入网隧道信息。当业务的无线接入优先级信息指示的业务优先使用的无线接入技术为第二RAN对应的无线接入技术，则第三信息为第二RAN的接入网隧道信息。
在第二种实现方法中，当业务的无线接入优先级信息指示的业务优先使用的无线接入技术为第一RAN对应的无线接入技术，第三信息为指示信息，该指示信息用于指示选择使用的无线接入技术信息为第一RAN对应的无线接入技术信息。当无线接入优先级信息指示的业务优先使用的无线接入技术为第二RAN对应的无线接入技术，则第三信息为指示信息，指示信息用于指示选择使用的无线接入技术信息为第二RAN对应的无线接入技术信息。
情形2，未建立DC。
当业务的无线接入优先级信息指示的业务优先使用的无线接入技术与第一RAN对应的无线接入技术相同，则第三信息为指示信息，指示信息用于指示选择使用的无线接入技术信息为第一RAN对应的无线接入技术信息。当业务的无线接入优先级信息指示的业务优先使用的无线接入技术与第一RAN对应的无线接入技术不相同，则建第一RAN建立DC，即插入第二RAN，且第三信息为指示信息，指示信息用于指示选择使用的无线接入技术信息为目标无线接入技术信息，目标无线接入技术信息与第一RAN对应的无线接入技术信息不相同，即该目标无线接入技术信息为第二RAN对应的无线接入技术信息。
针对上述图6A至图6B所示的实施例，下面给出具体的不同实现方式。
如图7所示，为本申请提供的又一种通信方法流程示意图。该方法包括以下步骤：
步骤701a，AF向PCF发送第一信息，相应地，PCF可以接收到第一信息。
该第一信息为应用信息(Application information)或业务信息(service information)，该业务信息用于指示业务类型或者业务描述信息(如业务的IP地址、端口)等信息。
可选的，该第一信息中还可以包含无线接入倾向信息。该无线接入倾向信息用于指示不同无线接入的优先级。
比如，作为一种实现方式，无线接入倾向信息可以为：EUTRA，优先级值为X；NR，优先级值为Y。其中，优先级值越小，表明优先级越高。因此，当X小于Y时，表明当两种无线接入都可用时，优先选择使用EUTRA。当X大于Y时，表明当两种无线接入都可用时，优先选择使用NR。当X等于Y时，表明当两种无线接入都可用时，随机选择使用NR或EUTRA。当然，也可以是优先级值越大，表明优先级越高。其实现方式与上述方式类似，不再赘述。
再比如，作为又一种实现方式，无线接入倾向信息可以为1比特的指示信息。当该指示信息为“1”时，表明当两种无线接入都可用时，优先选择使用NR；当该指示信息为“0”时，表明当两种无线接入都可用时，优先选择使用EUTRA。当然，也可以是当该指示信 息为“0”时，表明当两种无线接入都可用时，优先选择使用NR；当该指示信息为“1”时，表明当两种无线接入都可用时，优先选择使用EUTRA。当然，若有三种或三种以上的无线接入技术，则可以使用2比特或2比特以上来指示无线接入倾向信息。
再比如，作为又一种实现方式，无线接入倾向信息可以为：(NR，EUTRA)，表明当两种无线接入都可用时，优先选择使用NR。或者，无线接入倾向信息可以为：(EUTRA，NR)，表明当两种无线接入都可用时，优先选择使用EUTRA。当然，若有三种或三种以上的无线接入技术，比如还可以加入卫星接入技术、微波技术等，则也可以采用此方法来指示无线接入倾向信息。
步骤701b，PCF确定策略计费控制(Policy and Charging Control，PCC)规则，该PCC规则包含无线接入优先级信息。
在一种实现方法中，若上述步骤701a的第一信息中不包含无线接入倾向信息，则PCF可以根据签约信息(比如业务策略签约信息)和/或NWDAF网元提供的信息(如业务分别使用EUTRA或NR传输时的业务体验信息)确定业务的无线接入优先级信息。比如，业务策略签约信息指示了优先选择的无线接入技术，或者是业务体验更佳的无线接入技术作为优先选择的无线接入技术。
在又一种实现方法中，若上述步骤701a的第一信息中包含无线接入倾向信息，则PCF可以根据无线接入倾向信息，确定无线接入优先级信息，比如，PCF确定的无线接入优先级信息可以与无线接入倾向信息相同。或者，PCF还可以根据无线接入倾向信息和签约信息(比如业务策略签约信息)确定无线接入优先级信息。或者，PCF还可以根据无线接入倾向信息和NWDAF网元提供的信息(如业务分别使用EUTRA或NR传输时的业务体验信息)确定无线接入优先级信息。或者，PCF还可以根据无线接入倾向信息、签约信息和NWDAF网元提供的信息(如业务分别使用EUTRA或NR传输时的业务体验信息)确定业务的无线接入优先级信息。
步骤701c，PCF向SMF发送包含业务的无线接入优先级信息的PCC规则，相应地，SMF可以接收到该PCC规则。
比如，PCF向SMF发送PCF initiated SM Policy Association Modification消息，该消息中包含PCC规则。
可选的，在PDU会话建立过程中，MN向SMF发送MN的能力指示信息，所述能力指示信息可以为NR-EUTRA，NR-NR或EUTRA-NR。具体的，若MN为NR，则能力指示信息可以指示支持NR-EUTRA或NR-NR；若MN为EUTRA，则能力指示信息可以指示支持EUTRA-NR。进一步的，SMF向PCF发送能力指示信息。若能力指示信息指示支持两种不同类型的无线接入技术的DC时，PCF才会在PCC规则中包含上述业务的无线接入优先级信息。
步骤702，SMF确定发起PDU会话修改流程。
步骤703，SMF向AMF发送第一请求(如Namf_Communication_N1N2MessageTransfer)，相应地，AMF可以接收到该第一请求。
该第一请求中包含PDU会话标识、N1 SM容器和N2 SM信息。其中，N1 SM容器是发给UE的，N2 SM信息是发给MN的，该N2 SM信息包含PDU会话标识、QFI、QoS profile和QoS流的无线接入优先级信息。
其中，QoS流的无线接入优先级信息是根据业务的无线接入优先级信息确定的。QoS 流的无线接入优先级信息指示的无线接入技术的优先级与业务的无线接入优先级信息指示的无线接入技术的优先级相同，但QoS流的无线接入优先级信息与业务的无线接入优先级信息在形式上或表达方式上可以不同。
可选的，在PDU会话建立过程中，MN向SMF发送MN的能力指示信息，所述能力指示信息可以为NR-EUTRA，NR-NR或EUTRA-NR。具体的，若MN为NR，则能力指示信息可以指示支持NR-EUTRA或NR-NR；若MN为EUTRA，则能力指示信息可以指示支持EUTRA-NR。若能力指示信息指示支持两种不同类型的无线接入技术的DC时，SMF在第一请求中包含上述QoS流的无线接入优先级信息。
步骤703a，AMF向SMF发送第一响应(如Namf_Communication_N1N2MessageTransfer response)，相应地，SMF可以接收到该第一响应。
步骤704，AMF向MN发送N2会话请求(N2 session Request)消息，相应地，MN可以接收到该N2会话请求消息。
该请求消息中包含上述N1 SM容器和上述N2 SM信息。
步骤705，MN根据QoS流的无线接入优先级信息确定业务传输路径。
下面分情形讨论。
情形一，已经建立DC。
当QoS流的无线接入优先级信息指示优先使用的无线接入类型与MN对应的无线接入技术类型相同时，则MN确定由MN来建立业务对应的QoS flow。
当QoS流的无线接入优先级信息指示优先使用的无线接入类型与SN对应的无线接入技术类型相同时，则MN确定由SN来建立业务对应的QoS flow。
情形二，未建立DC。
当QoS流的无线接入优先级信息指示优先使用的无线接入类型与MN对应的无线接入技术类型相同时，则MN确定不需要建立DC，即不需要插入SN，且MN确定由MN来建立业务对应的QoS flow。
当QoS流的无线接入优先级信息指示优先使用的无线接入类型与MN对应的无线接入技术类型不相同时，则MN确定需要建立DC，即需要插入SN，且MN确定由SN来建立业务对应的QoS flow。
需要说明的是，针对上述情形一或情形二，若无线接入信息指示可以使用低优先级的无线接入，则当QoS flow在优先级高的无线接入中建立失败时，MN确定可以使用优先级低的无线接入建立业务对应的QoS flow。
步骤706，MN与UE执行An-specific资源修改(AN-specific resource modification)，以建立空口资源。
步骤707，MN向AMF发送N2会话响应(N2 session response)消息，相应地，AMF可以接收到该N2会话响应消息。
该N2会话响应消息中包含非接入层(non access stratum，NAS)消息和N2 SM信息。可选的，若所述QoS flow未建立在优先级高的无线接入上，还可以在该N2会话响应消息中携带建立失败的原因值。
并且，还需要通过N2会话响应消息指示AN DL隧道信息，AN隧道信息用于指示QoS flow对应的下行隧道信息。下面介绍通过N2会话响应消息指示AN DL隧道信息的两种不同实现方法。
方法1，N2 SM信息包含AN隧道信息，该AN隧道信息可以是MN的隧道信息，或者是SN的隧道信息。
该方法为显示指示的方法，即在N2 SM信息中显示指示AN隧道信息。
方法2，N2 SM信息包含AN隧道信息，表明QoS flow对应的下行隧道信息为MN的隧道信息，N2 SM信息不包含AN隧道信息，表明QoS flow对应的下行隧道信息为SN的隧道信息。当然，也可以是N2 SM信息包含AN隧道信息，表明QoS flow对应的下行隧道信息为SN的隧道信息，N2 SM信息不包含AN隧道信息，表明QoS flow对应的下行隧道信息为MN的隧道信息。
需要说明的是，该方法是针对已经建立DC的场景，SMF中存储有两个AN隧道信息，即MN的隧道信息和SN的隧道信息，并且将其中一个默认的隧道信息，即当N2 SM信息中不包含AN隧道信息时，则确定默认的隧道信息为QoS flow对应的下行隧道信息。
其中，默认的隧道信息的设定，可以由MN在DC建立的过程中通知给SMF，或者规则预配置在SMF和MN上，如第一个建立的AN隧道信息为默认的隧道信息。
步骤708a，AMF向SMF发送第二请求(如Nsmf_PDUSession_UpdateSMContextrequest)，相应地，SMF可以接收到该第二请求。
该第二请求中携带上述NAS消息和上述N2 SM信息。
步骤708b，SMF向AMF发送第二响应(如Nsmf_PDUSession_UpdateSMContextresponse)，相应地，AMF可以接收到该第二响应。
可选的，若该流程触发DC的建立，则该第二响应中可以包含CN UL隧道信息。
步骤708c，若AMF接收到的第二响应中包含CN UL隧道信息，则AMF向MN发送该CN UL隧道信息，相应地，MN可以接收到该CN UL隧道信息。
比如，AMF向MN发送N2会话通知(N2 Session notification)，该N2会话通知中包含N2 SM信息，N2 SM信息中包含CN UL隧道信息。
该步骤可选。
步骤709，SMF确定执行N4会话修改流程。
需要说明的是，若步骤705中需要建立DC，即步骤708a中AN DL隧道为新建的SN隧道信息，且由UPF分配CN UL隧道信息时，则需要先执行步骤710再执行步骤708b，否则没有该限定。
步骤710，SMF向UPF发起N4会话修改。
基于上述实施例，PCF根据AF的业务需求生成包含业务的无线接入优先级信息的PCC规则，并发送给SMF，进一步的SMF根据业务的无线接入优先级信息确定QoS流的无线接入优先级信息，并将QoS流的无线接入优先级信息发送给RAN，使得RAN能够根据该QoS流的优先级信息选择无线接入技术，从而有助于保证不同的业务按需使用无线接入技术。
如图8所示，为本申请提供的又一种通信方法流程示意图。该方法包括以下步骤：
步骤801a至步骤802，同图7实施例的步骤701a至步骤702，可参考前述描述。
步骤803，SMF向AMF发送第一请求(如Namf_Communication_N1N2MessageTransfer)，相应地，AMF可以接收到该第一请求。
该第一请求中包含PDU会话标识、N1 SM容器和N2 SM信息。其中，N1 SM容器是 发给UE的，N2 SM信息是发给MN的，该N2 SM信息包含PDU会话标识、QFI、QoS profile和第二信息。
可选的，在PDU会话建立过程中，MN向SMF发送MN的能力指示信息，所述能力指示信息可以为NR-EUTRA，NR-NR或EUTRA-NR。具体的，若MN为NR，则能力指示信息可以指示支持NR-EUTRA或NR-NR；若MN为EUTRA，则能力指示信息可以指示支持EUTRA-NR。若能力指示信息指示支持两种不同类型的无线接入技术的DC时，SMF在第一请求中包含上述第二信息。
该第二信息为AN隧道信息或指示信息。即SMF根据PCC规则中的无线接入优先级信息，确定选择的无线接入技术类型，然后根据选择的无线接入技术确定AN隧道信息或确定指示信息。下面分两种情形分别说明。
情形一，已经建立DC。
对于已经建立DC的场景，SMF上保存有MN发送的{AN隧道信息1，无线技术类型1}和{AN隧道信息2，无线技术类型2}。SMF根据PCF发送的PCC规则确定AN隧道信息，比如，根据PCC规则确定选择的无线技术类型为无线技术类型1(NR或EUTRA)，则确定AN隧道信息为AN隧道信息1，因此上述第二信息为AN隧道信息1；再比如，根据PCC规则确定选择的无线技术类型为无线技术类型2，则确定AN隧道信息为AN隧道信息2，因此上述第二信息为AN隧道信息2。
或者，预先配置或约定用1比特的指示信息，来指示AN隧道信息，比如“1”指示AN隧道信息1，“0”指示AN隧道信息2，则确定AN隧道信息为AN隧道信息1时，则上述第二信息为指示信息“1”；确定AN隧道信息为AN隧道信息2时，则上述第二信息为指示信息“0”。
或者，预先配置或约定用1比特的指示信息，来指示用于建立QoS flow传输业务的无线接入技术类型。比如“1”指示无线接入技术类型1，“0”指示无线接入技术类型2，则确定无线接入技术类型为无线接入技术类型1时，则上述第二信息为指示信息“1”；确定无线接入技术类型为无线接入技术类型2时，则上述第二信息为指示信息“0”。
情形二，未建立DC。
对于未在两个无线接入建立两个用户面链路的场景，SMF仅保存一个{AN隧道信息1，无线接入技术类型1}。此时，上述第二指示信息为指示信息，比如预先配置或约定用1比特的指示信息，来指示用于建立QoS flow传输业务的无线接入技术类型。比如“1”指示无线接入技术类型1，“0”指示无线接入技术类型2，则当确定无线接入技术类型为无线接入技术类型1时，上述第二信息为指示信息“1”；当确定无线接入技术类型为无线接入技术类型2时，则上述第二信息为指示信息“0”。
步骤803a，AMF向SMF发送第一响应(如Namf_Communication_N1N2MessageTransfer response)，相应地，SMF可以接收到该第一响应。
步骤804，AMF向MN发送N2会话请求(N2 session Request)消息，相应地，MN可以接收到该N2会话请求消息。
该请求消息中包含上述N1 SM容器和上述N2 SM信息。
步骤805，MN根据第二信息确定业务传输路径。
下面分情形讨论。
情形一，已经建立DC。
当第二信息为AN隧道信息时，若该AN隧道信息是MN的隧道信息，则MN确定由MN来建立业务对应的QoS flow；若该AN隧道信息是SN的隧道信息，则MN确定由SN来建立业务对应的QoS flow。
当第二信息为指示信息时，且该指示信息用于指示AN隧道信息，若该指示信息指示的是MN的隧道信息，则MN确定由MN来建立业务对应的QoS flow；若该指示信息指示的是SN的隧道信息，则MN确定由SN来建立业务对应的QoS flow。
当第二信息为指示信息时，且该指示信息指示用于建立QoS flow传输业务的无线接入技术类型，若该指示信息指示的无线接入技术类型与MN对应的无线接入技术类型相同，则MN确定由MN来建立业务对应的QoS flow；若该指示信息指示的无线接入技术类型与SN对应的无线接入技术类型相同，则MN确定由SN来建立业务对应的QoS flow。
情形二，未建立DC。
第二信息为指示信息，且该指示信息指示用于建立QoS flow传输业务的无线接入技术类型，若该指示信息指示的无线接入技术类型与MN对应的无线接入技术类型相同，则MN确定不需要建立DC，即不需要插入SN，且MN确定由MN来建立业务对应的QoS flow。若该指示信息指示的无线接入技术类型与MN对应的无线接入技术类型不相同，则MN确定需要建立DC，即需要插入SN，且MN确定由SN来建立业务对应的QoS flow。
需要说明的是，针对上述情形一或情形二，若无线接入信息指示可以使用低优先级的无线接入，则当QoS flow在优先级高的无线接入中建立失败时，MN确定可以使用优先级低的无线接入建立业务对应的QoS flow。
步骤806至步骤810，同图7实施例的步骤706至步骤710，可参考前述描述。
基于上述实施例，PCF根据AF的业务需求生成包含业务的无线接入优先级信息的PCC规则，并发送给SMF，进一步的SMF根据业务的无线接入优先级信息向MN发送AN隧道信息或指示信息，MN根据AN隧道信息或指示信息确定建立QoS flow，或向已经建立的SN发起QoS flow建立请求，或者插入SN并向SN发送QoS flow建立请求，使得业务在条件允许时能够根据需求优先使用合适的无线接入技术。
如图9所示，为本申请提供的又一种通信方法流程示意图。该方法包括以下步骤：
步骤901，UE向MN发送接入层(access stratum，AS)消息，相应地，MN可以接收到该AS消息。
该AS消息中携带NAS消息，该NAS消息包含PDU会话标识、数据网名称(Data Network Name，DNN)、单网络切片选择辅助信息(single network slice selection assistance information，S-NSSAI)和会话建立请求。其中，会话建立请求携带PDU会话标识和DNN等信息。
步骤902，MN向AMF发送N2消息，相应地，AMF可以接收到该N2消息。
该N2消息携带上述NAS消息和UE的位置信息。
步骤903，AMF根据DNN、S-NSSAI等信息选择SMF，并保存PDU会话标识、S-NSSAI、DNN、SMF ID之间的对应关系。
步骤904，AMF向SMF发送上下文建立请求(如Nsmf_PDUSession_CreateSMContext request)，相应地，SMF可以接收到该上下文建立请求。
该上下文建立请求中携带永久签约标识(Subscription Permanent Identifier，SUPI)、DNN、 S-NSSAI、UE的位置信息和会话建立请求。
步骤905，SMF与UDM交互，从而获取到会话管理签约数据(session management subscription data)。具体的过程描述如下：
SMF向UDM发送Nudm_SDM_Get Request，携带UE标识、DNN、S-NSSAI等信息。UDM返回Nudm_SDM_Get Response，携带会话管理签约数据。
可选的，会话管理签约数据包含DNN对应的无线接入优先级信息。
步骤906，SMF向AMF发送上下文建立响应(如Nsmf_PDUSession_CreateSMContext Response)，相应地，AMF可以接收到该上下文建立响应。
步骤907a，若不使用PCC架构，则SMF确定QoS流的无线接入优先级信息。
SMF确定QoS流的无线接入优先级信息的方法包括但不限于：
方法1，上述步骤905的会话管理签约数据包含DNN对应的QoS流的无线接入优先级信息，则SMF可以根据DNN和会话管理签约数据，确定QoS流的无线接入优先级信息。
方法2，SMF本地配置有DNN和DNN对应的QoS流的无线接入优先级信息，则SMF可以根据DNN和本地配置，确定QoS流的无线接入优先级信息。
步骤907b，若使用PCC架构，则PCF确定业务的无线接入优先级信息。
PCF确定业务的无线接入优先级信息的方法包括但不限于：
方法1，PCF从UDR获取DNN对应的无线接入优先级信息，则PCF可以根据DNN和DNN对应的无线接入优先级信息，确定业务的无线接入优先级信息。
方法2，PCF本地配置有DNN和DNN对应的无线接入优先级信息，则PCF可以根据DNN和本地配置，确定业务的无线接入优先级信息。
需要说明的是，上述步骤907a与步骤907b为二选一执行，即要么执行步骤907a，要不执行步骤907b。
进一步的，若执行步骤907b，则在步骤907b之后，还执行以下步骤908。
步骤908，对于使用PCC架构的场景，SMF通过SM initiated SM policy Association建立流程从PCF获取PDU会话策略信息，且PDU会话策略信息中包含无线接入优先级信息。
步骤909，SMF选择UPF。
步骤910，SMF向UPF发送N4会话建立请求，相应地，UPF可以接收到该N4会话建立请求。
该N4会话建立请求中携带上行转发规则，该上行转发规则包含N4会话标识、报文检测信息等，该上行转发规则用于指示UPF对上行报文按照该规则进行处理。UPF向SMF返回N4会话建立响应，该N4会话建立响应中携带CN随带信息。
步骤911，SMF向AMF发送第一请求(如Namf_Communication_N1N2MessageTransfer request)，相应地，SMF可以接收到该第一请求。
该第一请求携带PDU会话标识、N2 SM信息和N1 SM信息。其中，N2 SM信息中包含步骤910中的CN隧道信息、QFI、5G QoS标识(5G QoS Identifier，5QI)和无线接入优先级信息等参数。N1 SM信息中包含会话建立接受消息。
可选的，在PDU会话建立过程中，MN向SMF发送MN的能力指示信息，所述能力指示信息可以为NR-EUTRA，NR-NR或EUTRA-NR。具体的，若MN为NR，则能力指示信息可以指示支持NR-EUTRA或NR-NR；若MN为EUTRA，则能力指示信息可以指示支持EUTRA-NR。若能力指示信息指示支持两种不同的接入网类型的DC时，SMF在第 一请求中包含上述QoS流的无线接入优先级信息。
步骤911a，AMF向SMF发送第一响应(如Namf_Communication_N1N2MessageTransfer response)，相应地，SMF可以接收到该第一响应。
步骤912，AMF向MN发送N2会话请求，相应地，MN可以接收到该N2会话请求。
该N2会话请求中携带NAS消息、步骤911中的N2 SM信息。该NAS消息包含PDU会话标识和步骤911中的N1 SM信息。
步骤912a，MN根据QoS流的无线接入优先级信息确定PDU会话传输路径。
下面分情形讨论。
情形一，已经建立DC。
当QoS流的无线接入优先级信息指示优先使用的无线接入类型与MN对应的无线接入技术类型相同时，则MN确定核心网侧与MN建立用户面链路。
当QoS流的无线接入优先级信息指示优先使用的无线接入类型与SN对应的无线接入技术类型相同时，则MN确定核心网侧与SN建立用户面链路。
情形二，未建立DC。
当QoS流的无线接入优先级信息指示优先使用的无线接入类型与MN对应的无线接入技术类型相同时，则MN确定不需要建立DC，即不需要插入SN，且MN确定核心网侧与MN建立用户面链路。
当QoS流的无线接入优先级信息指示优先使用的无线接入类型与MN对应的无线接入技术类型不相同时，则MN确定需要建立DC，即需要插入SN，且MN确定核心网侧与新建的SN建立用户面链路。
需要说明的是，若需要插入SN，则SN插入流程可以重用现有流程。
需要说明的是，针对上述情形一或情形二，若无线接入信息指示可以使用低优先级的无线接入，则当核心网侧与优先级高的无线接入类型对应的AN建立用户面链路失败时，则MN确定核心网侧与优先级低的无线接入类型对应的AN建立用户面链路。
后续对于该PDU会话的任何QoS flow优先在上述建立的用户面链路上传输。
步骤913，MN发起与UE之间的无线连接建立过程。在该过程中，MN将NAS消息发送至UE。
步骤914，MN向AMF发送N2会话响应，相应地，SMF可以接收到该N2会话响应。
该N2会话响应携带PDU会话标识和N2 SM信息。该N2 SM信息携带AN隧道信息。
步骤915，SMF建立AN与UPF之间的用户面连接。
这里的AN指的是上述步骤912a中确定的PDU会话传输路径对应的AN，即为MN或SN。
具体的包括如下过程：
-AMF向SMF发送Nsmf_PDUSession_UpdateSMContext Request，携带步骤914中的N2 SM信息。
-SMF向UPF发送N4会话修改请求，携带下行转发规则和步骤915中的AN隧道信息。下行转发规则包含N4会话标识、报文检测信息等，下行转发规则用于指示UPF对下行报文按照该规则进行处理。
-UPF向SMF返回N4会话修改响应。
-SMF向AMF返回Nsmf_PDUSession_UpdateSMContext Response。
该实施例提供有一种PDU会话粒度的无线接入选择的方法，核心网根据DNN的需求提供无线接入优先级信息，使得MN根据核心网提供的无线接入优先级信息选择无线接入类型，从而保证不同的PDU会话按需使用无线接入技术。
如图10所示，为本申请提供的又一种通信方法流程示意图。在无线接入网上预配置5QI以及5QI对应的无线接入优先级信息。可选的，可以在支持建立双连接且双连接对应的无线接入不同时，在无线接入网上预配置5QI及5QI对应的无线接入优先级信息，从而根据5QI对应的无线接入优先级信息，确定QoS流的无线接入优先级信息。或者，获取QoS流的QoS属性值，根据预配置的QoS属性值以及QoS属性值对应的无线接入优先级信息，确定QoS流的无线接入优先级信息。
需要说明的是，这里的5QI可以是标准的5QI，或者预配置的5QI，或者是动态的QoS属性值，每个属性值可以为一个范围值。
该方法包括以下步骤：
步骤1000，MN根据5QI和预配置信息，确定将QoS流迁移到SN。
预配置信息包括5QI以及5QI对应的无线接入优先级信息。
即MN根据5QI和预配置信息，确定该5QI对应的无线接入优先级信息指示的高优先级(即优先使用)的无线接入技术与MN对应的无线接入技术不同，则确定需要将QoS流迁移到SN。从而触发插入SN的流程。
作为该步骤的一种可替代实现方法，预配置信息也可以包括QoS属性值以及QoS属性值对应的无线接入优先级信息。MN也可以根据QoS属性值和预配置信息，确定将QoS流迁移到SN。即MN根据QoS属性值和预配置信息，确定该QoS属性值对应的无线接入优先级信息指示的高优先级(即优先使用)的无线接入技术与MN对应的无线接入技术不同，则确定需要将QoS流迁移到SN。从而触发插入SN的流程。
步骤1001至步骤1012，同图4实施例的步骤401至步骤412，可参考前述描述。
基于该实施例，通过在无线接入网上预配置5QI(或QoS属性值)，以及和5QI(或QoS属性值)对应的无线接入优先级信息，使得MN根据该预配置信息选择SN并将对应的QoS流迁移到SN上，从而使得MN能够尽可能的按需选择无线接入网。
上述主要从各个网元之间交互的角度对本申请提供的方案进行了介绍。可以理解的是，上述实现各网元为了实现上述功能，其包含了执行各个功能相应的硬件结构和/或软件模块。本领域技术人员应该很容易意识到，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，本发明能够以硬件或硬件和计算机软件的结合形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行，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发明的范围。
如图11所示，为本申请所涉及的通信装置的一种可能的示例性框图，该装置1100可以以软件或硬件的形式存在。装置1100可以包括：通信单元1101和处理单元1102。作为一种实现方式，通信单元1101可以包括接收单元和发送单元。处理单元1102用于对装置1100的动作进行控制管理。通信单元1101用于支持装置1100与其他网络实体的通信。
其中，处理单元1102可以是处理器或控制器，例如可以是通用中心处理器(central  processing unit，CPU)，通用处理器，数字信号处理(digital signal processing，DSP)，专用集成电路(application specific integrated circuits，ASIC)，现场可编程门阵列(field programmable gate array，FPGA)或者其他可编程逻辑器件、晶体管逻辑器件、硬件部件或者其任意组合。其可以实现或执行结合本申请公开内容所描述的各种示例性的逻辑方框，模块和电路。所述处理器也可以是实现计算功能的组合，例如包括一个或多个微处理器组合，DSP和微处理器的组合等等。通信单元1101是该装置的接口电路，用于从其它装置接收信号或向其它装置发送信息。例如，当该装置以芯片的方式实现时，该通信单元1101是该芯片用于从其它芯片或装置接收信号的接口电路，和/或用于向其它芯片或装置发送信号的接口电路。
该装置1100可以为上述实施例中的会话管理网元、接入网设备，还可以为用于会话管理网元、接入网设备的芯片。例如，当装置1100为会话管理网元、接入网设备时，该处理单元1102例如可以是处理器，该通信单元1101例如可以是发送器和/或接收器。可选的，该发送器和接收器可以包括射频电路，该存储单元例如可以是存储器。例如，当装置1100为用于会话管理网元、接入网设备的芯片时，该处理单元1102例如可以是处理器，该通信单元1101例如可以是输入/输出接口、管脚或电路等。该处理单元1102可执行存储单元存储的计算机执行指令，可选地，该存储单元为该芯片内的存储单元，如寄存器、缓存等，该存储单元还可以是该会话管理网元、接入网设备内的位于该芯片外部的存储单元，如只读存储器(read-only memory，ROM)或可存储静态信息和指令的其他类型的静态存储设备，随机存取存储器(random access memory，RAM)等。
该装置可以为上述实施例中的会话管理网元，则：
在第一个方案中，处理单元1102，用于确定QoS流的无线接入优先级信息，所述QoS流的无线接入优先级信息用于指示所述QoS流使用的无线接入技术的优先级；通信单元1101，用于向接入网设备发送所述QoS流的无线接入优先级信息，所述QoS流的无线接入优先级信息用于所述接入网设备确定建立所述QoS流所使用的无线接入技术。
在一种可能的实现方法中，所述处理单元1102，具体用于根据从策略控制网元接收的业务的无线接入优先级信息，确定所述QoS流的无线接入优先级信息，所述QoS流用于传输所述业务。
在一种可能的实现方法中，所述通信单元1101，还用于接收来自所述接入网设备的第一信息，所述第一信息指示了接入网下行隧道信息，所述接入网下行隧道信息用于指示所述QoS流对应的下行隧道信息，所述接入网下行隧道信息为所述QoS流的无线接入优先级信息指示的优先使用的无线接入技术对应的接入网设备的下行隧道信息；以及，向用户面网元发送所述接入网下行隧道信息。
在一种可能的实现方法中，所述通信单元1101，还用于向所述接入网设备发送核心网上行隧道信息。
在一种可能的实现方法中，所述处理单元1102，具体用于获取第二信息，所述第二信息为终端设备的会话的DNN或签约信息，所述QoS流为所述会话的QoS流；根据所述第二信息对应的无线接入优先级信息，确定所述QoS流的无线接入优先级信息。
在一种可能的实现方法中，所述通信单元1101，用于向接入网设备发送QoS流的无线接入优先级信息，具体包括：用于向所述接入网设备发送N2会话管理信息，所述N2会话管理信息包括所述QoS流的无线接入优先级信息。
在一种可能的实现方法中，所述通信单元1101，还用于从所述接入网设备接收能力指示信息，所述能力指示信息用于指示支持双连接；所述处理单元1102，还用于根据所述能力指示信息，确定向所述接入网设备发送所述QoS流的无线接入优先级信息。
在一种可能的实现方法中，所述QoS流使用的无线接入技术为EUTRA或NR。
在第二个方案中，所述通信单元1101，用于从策略控制网元接收业务的无线接入优先级信息，所述业务的无线接入优先级信息用于指示所述业务使用的无线接入技术的优先级；所述处理单元1102，用于根据所述业务的无线接入优先级信息，确定第三信息，所述第三信息为接入网隧道信息或指示信息，所述指示信息用于指示选择使用的无线接入技术信息；所述通信单元1101，还用于向第一接入网设备发送所述第三信息。
在一种可能的实现方法中，在已经建立双连接的情形下，所述第一接入网设备为主接入网设备，第二接入网设备为辅接入网设备；
当所述业务的无线接入优先级信息指示的所述业务优先使用的无线接入技术为所述第一接入网设备对应的无线接入技术，所述第三信息为所述第一接入网设备的接入网隧道信息；或，当所述业务的无线接入优先级信息指示的所述业务优先使用的无线接入技术为所述第二接入网设备对应的无线接入技术，所述第三信息为所述第二接入网设备的接入网隧道信息；或者，
当所述业务的无线接入优先级信息指示的所述业务优先使用的无线接入技术为所述第一接入网设备对应的无线接入技术，所述第三信息为所述指示信息，所述指示信息用于指示选择使用的无线接入技术信息为所述第一接入网设备对应的无线接入技术信息；或，当所述业务的无线接入优先级信息指示的所述业务优先使用的无线接入技术为所述第二接入网设备对应的无线接入技术，所述第三信息为所述指示信息，所述指示信息用于指示选择使用的无线接入技术信息为所述第二接入网设备对应的无线接入技术信息。
在一种可能的实现方法中，在未建立双连接的情形下；
当所述业务的无线接入优先级信息指示的所述业务优先使用的无线接入技术与所述第一接入网设备对应的无线接入技术相同，所述第三信息为所述指示信息，所述指示信息用于指示选择使用的无线接入技术信息为所述第一接入网设备对应的无线接入技术信息；
当所述业务的无线接入优先级信息指示的所述业务优先使用的无线接入技术与所述第一接入网设备对应的无线接入技术不相同，所述第三信息为所述指示信息，所述指示信息用于指示选择使用的无线接入技术信息为目标无线接入技术信息，所述目标无线接入技术信息与所述第一接入网设备对应的无线接入技术信息不相同。
在一种可能的实现方法中，所述选择使用的无线接入技术信息为选择使用的无线接入技术或选择使用的无线接入技术对应的路径信息。
该装置也可以为上述实施例中的接入网设备，则：所述处理单元1102，用于确定服务质量QoS流的无线接入优先级信息，所述QoS流的无线接入优先级信息用于指示所述QoS流使用的无线接入技术的优先级；根据所述QoS流的无线接入优先级信息，确定建立所述QoS流所使用的无线接入技术。
在一种可能的实现方法中，所述处理单元1102，还用于：确定的所述QoS流所使用的无线接入技术与第一接入网设备对应的无线接入技术相同，则确定由第一接入网设备建立所述QoS流；或者，确定的所述QoS流所使用的无线接入技术与第一接入网设备对应的无线接入技术不相同，则确定由第二接入网设备建立所述QoS流；所述第一接入网设备 和所述第二接入网设备分别为双连接场景中的主接入网设备和辅接入网设备。
在一种可能的实现方法中，所述通信单元1101，用于向会话管理网元发送第一信息，所述第一信息指示了接入网下行隧道信息，所述接入网下行隧道信息用于指示所述QoS流对应的下行隧道信息，所述接入网下行隧道信息为所述QoS流的无线接入优先级信息指示的优先使用的无线接入技术对应的接入网设备的下行隧道信息。
在一种可能的实现方法中，所述通信单元1101，还用于从所述会话管理网元接收核心网上行隧道信息。
在一种可能的实现方法中，所述处理单元1102，用于确定QoS流的无线接入优先级信息，具体包括：通过所述通信单元1101从会话管理网元接收所述QoS流的无线接入优先级信息；或者，通过所述通信单元1101获取所述QoS流的5G QoS标识5QI或QoS属性值，根据所述5QI对应的无线接入优先级信息、或所述QoS属性值对应的无线接入优先级信息，确定所述QoS流的无线接入优先级信息。
在一种可能的实现方法中，所述QoS流使用的无线接入技术为EUTRA或NR。
若该装置1100是会话管理网元、接入网设备，则会话管理网元、接入网设备以采用集成的方式划分各个功能模块的形式来呈现。这里的“模块”可以指特定ASIC，电路，执行一个或多个软件或固件程序的处理器和存储器，集成逻辑电路，和/或其他可以提供上述功能的器件。在一个简单的实施例中，本领域的技术人员可以想到该会话管理网元、接入网设备可以采用图12所示的形式。
比如，图12中的处理器1202可以通过调用存储器1201中存储的计算机执行指令，使得会话管理网元、接入网设备执行上述方法实施例中的方法。
具体的，图11中的通信单元1101和处理单元1102的功能/实现过程可以通过图12中的处理器1202调用存储器1201中存储的计算机执行指令来实现。或者，图11中的处理单元1102的功能/实现过程可以通过图12中的处理器1202调用存储器1201中存储的计算机执行指令来实现，图11中的通信单元1101的功能/实现过程可以通过图12中的通信接口1203来实现。
可选的，当该装置1200是芯片或电路时，则通信单元1101的功能/实现过程还可以通过管脚或电路等来实现。
如图12所示，为本申请提供的又一种通信装置示意图，该装置可以是上述实施例中的会话管理网元、接入网设备。该装置1200包括：处理器1202和通信接口1203，可选的，装置1200还可以包括存储器1201。可选的，装置1200还可以包括通信线路1204。其中，通信接口1203、处理器1202以及存储器1201可以通过通信线路1204相互连接；通信线路1204可以是外设部件互连标准(peripheral component interconnect，简称PCI)总线或扩展工业标准结构(extended industry standard architecture，简称EISA)总线等。所述通信线路1204可以分为地址总线、数据总线、控制总线等。为便于表示，图12中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。
处理器1202可以是一个CPU，微处理器，ASIC，或一个或多个用于控制本申请方案程序执行的集成电路。
通信接口1203，使用任何收发器一类的装置，用于与其他设备或通信网络通信，如以太网，无线接入网(radio access network，RAN)，无线局域网(wireless local area networks，WLAN)，有线接入网等。
存储器1201可以是ROM或可存储静态信息和指令的其他类型的静态存储设备，RAM或者可存储信息和指令的其他类型的动态存储设备，也可以是电可擦可编程只读存储器(electrically erasable programmable read-only memory，EEPROM)、只读光盘(compact disc read-only memory，CD-ROM)或其他光盘存储、光碟存储(包括压缩光碟、激光碟、光碟、数字通用光碟、蓝光光碟等)、磁盘存储介质或者其他磁存储设备、或者能够用于携带或存储具有指令或数据结构形式的期望的程序代码并能够由计算机存取的任何其他介质，但不限于此。存储器可以是独立存在，通过通信线路1204与处理器相连接。存储器也可以和处理器集成在一起。
其中，通信接口1203，用于接收代码指令并传输至处理器1202，并由处理器1202来控制执行，从而实现本申请上述方法实施例提供的通信方法。其中，代码指令可以是来自存储器1201，也可以是从其他地方获取。
其中，存储器1201用于存储执行本申请方案的计算机执行指令，并由处理器1202来控制执行。处理器1202用于执行存储器1201中存储的计算机执行指令，从而实现本申请上述实施例提供的通信方法。
可选的，当该装置1200是芯片时，那么通信接口1203的功能/实现过程还可以通过管脚或电路等来实现。可选地，当该装置1200是芯片时，所述存储器可以为所述芯片内的存储单元，如寄存器、缓存等。当然，当该装置1200是芯片时，所述存储器还可以是位于所述芯片外部的存储单元。
可选的，本申请实施例中的计算机执行指令也可以称之为应用程序代码，本申请实施例对此不作具体限定。
本领域普通技术人员可以理解：本申请中涉及的第一、第二等各种数字编号仅为描述方便进行的区分，并不用来限制本申请实施例的范围，也表示先后顺序。“和/或”，描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。字符“/”一般表示前后关联对象是一种“或”的关系。“至少一个”是指一个或者多个。至少两个是指两个或者多个。“至少一个”、“任意一个”或其类似表达，是指的这些项中的任意组合，包括单项(个)或复数项(个)的任意组合。例如，a,b,或c中的至少一项(个、种)，可以表示：a,b,c,a-b,a-c,b-c,或a-b-c，其中a,b,c可以是单个，也可以是多个。“多个”是指两个或两个以上，其它量词与之类似。此外，对于单数形式“a”，“an”和“the”出现的元素(element)，除非上下文另有明确规定，否则其不意味着“一个或仅一个”，而是意味着“一个或多于一个”。例如，“a device”意味着对一个或多个这样的device。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机程序指令时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用 介质或者是包括一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质，(例如，软盘、硬盘、磁带)、光介质(例如，DVD)、或者半导体介质(例如固态硬盘(Solid State Disk，SSD))等。
本申请实施例中所描述的各种说明性的逻辑单元和电路可以通过通用处理器，数字信号处理器，专用集成电路(ASIC)，现场可编程门阵列(FPGA)或其它可编程逻辑装置，离散门或晶体管逻辑，离散硬件部件，或上述任何组合的设计来实现或操作所描述的功能。通用处理器可以为微处理器，可选地，该通用处理器也可以为任何传统的处理器、控制器、微控制器或状态机。处理器也可以通过计算装置的组合来实现，例如数字信号处理器和微处理器，多个微处理器，一个或多个微处理器联合一个数字信号处理器核，或任何其它类似的配置来实现。
本申请实施例中所描述的方法或算法的步骤可以直接嵌入硬件、处理器执行的软件单元、或者这两者的结合。软件单元可以存储于RAM存储器、闪存、ROM存储器、EPROM存储器、EEPROM存储器、寄存器、硬盘、可移动磁盘、CD-ROM或本领域中其它任意形式的存储媒介中。示例性地，存储媒介可以与处理器连接，以使得处理器可以从存储媒介中读取信息，并可以向存储媒介存写信息。可选地，存储媒介还可以集成到处理器中。处理器和存储媒介可以设置于ASIC中。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
尽管结合具体特征及其实施例对本申请进行了描述，显而易见的，在不脱离本申请的精神和范围的情况下，可对其进行各种修改和组合。相应地，本说明书和附图仅仅是所附权利要求所界定的本申请的示例性说明，且视为已覆盖本申请范围内的任意和所有修改、变化、组合或等同物。显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包括这些改动和变型在内。

Claims (49)

  1. 一种通信方法，其特征在于，包括：
    会话管理网元确定服务质量QoS流的无线接入优先级信息，所述QoS流的无线接入优先级信息用于指示所述QoS流使用的无线接入技术的优先级；
    所述会话管理网元向接入网设备发送所述QoS流的无线接入优先级信息，所述QoS流的无线接入优先级信息用于所述接入网设备确定建立所述QoS流所使用的无线接入技术。
  2. 如权利要求1所述的方法，其特征在于，所述会话管理网元确定QoS流的无线接入优先级信息，包括：
    所述会话管理网元根据从策略控制网元接收的业务的无线接入优先级信息，确定所述QoS流的无线接入优先级信息，所述QoS流用于传输所述业务。
  3. 如权利要求1或2所述的方法，其特征在于，还包括：
    所述会话管理网元接收来自所述接入网设备的第一信息，所述第一信息指示了接入网下行隧道信息，所述接入网下行隧道信息用于指示所述QoS流对应的下行隧道信息，所述接入网下行隧道信息为所述QoS流的无线接入优先级信息指示的优先使用的无线接入技术对应的接入网设备的下行隧道信息；
    所述会话管理网元向用户面网元发送所述接入网下行隧道信息。
  4. 如权利要求1-3任一所述的方法，其特征在于，还包括：
    所述会话管理网元向所述接入网设备发送核心网上行隧道信息。
  5. 如权利要求1所述的方法，其特征在于，所述会话管理网元确定QoS流的无线接入优先级信息，包括：
    所述会话管理网元获取第二信息，所述第二信息为终端设备的会话的数据网络名称DNN，所述QoS流为所述会话的QoS流；
    所述会话管理网元根据所述第二信息对应的无线接入优先级信息，确定所述QoS流的无线接入优先级信息。
  6. 如权利要求5所述的方法，其特征在于，所述会话管理网元向接入网设备发送QoS流的无线接入优先级信息，包括：
    所述会话管理网元向所述接入网设备发送N2会话管理信息，所述N2会话管理信息包括所述QoS流的无线接入优先级信息。
  7. 如权利要求1-6任一所述的方法，其特征在于，还包括：
    所述会话管理网元从所述接入网设备接收能力指示信息，所述能力指示信息用于指示支持双连接；
    所述会话管理网元根据所述能力指示信息，确定向所述接入网设备发送所述QoS流的无线接入优先级信息。
  8. 如权利要求1-7任一所述的方法，其特征在于，所述QoS流使用的无线接入技术为演进的统一陆地无线接入EUTRA或新无线电NR。
  9. 一种通信方法，其特征在于，包括：
    会话管理网元从策略控制网元接收业务的无线接入优先级信息，所述业务的无线接入优先级信息用于指示所述业务使用的无线接入技术的优先级；
    所述会话管理网元根据所述业务的无线接入优先级信息，确定第三信息，所述第三信息为接入网隧道信息或指示信息，所述指示信息用于指示选择使用的无线接入技术信息；
    所述会话管理网元向第一接入网设备发送所述第三信息。
  10. 如权利要求9所述的方法，其特征在于，在已经建立双连接的情形下，所述第一接入网设备为主接入网设备，第二接入网设备为辅接入网设备；
    当所述业务的无线接入优先级信息指示的所述业务优先使用的无线接入技术为所述第一接入网设备对应的无线接入技术，所述第三信息为所述第一接入网设备的接入网隧道信息；或，当所述业务的无线接入优先级信息指示的所述业务优先使用的无线接入技术为所述第二接入网设备对应的无线接入技术，所述第三信息为所述第二接入网设备的接入网隧道信息；或者，
    当所述业务的无线接入优先级信息指示的所述业务优先使用的无线接入技术为所述第一接入网设备对应的无线接入技术，所述第三信息为所述指示信息，所述指示信息用于指示选择使用的无线接入技术信息为所述第一接入网设备对应的无线接入技术信息；或，当所述业务的无线接入优先级信息指示的所述业务优先使用的无线接入技术为所述第二接入网设备对应的无线接入技术，所述第三信息为所述指示信息，所述指示信息用于指示选择使用的无线接入技术信息为所述第二接入网设备对应的无线接入技术信息。
  11. 如权利要求9所述的方法，其特征在于，在未建立双连接的情形下；
    当所述业务的无线接入优先级信息指示的所述业务优先使用的无线接入技术与所述第一接入网设备对应的无线接入技术相同，所述第三信息为所述指示信息，所述指示信息用于指示选择使用的无线接入技术信息为所述第一接入网设备对应的无线接入技术信息；
    当所述业务的无线接入优先级信息指示的所述业务优先使用的无线接入技术与所述第一接入网设备对应的无线接入技术不相同，所述第三信息为所述指示信息，所述指示信息用于指示选择使用的无线接入技术信息为目标无线接入技术信息，所述目标无线接入技术信息与所述第一接入网设备对应的无线接入技术信息不相同。
  12. 如权利要求9-11任一所述的方法，其特征在于，所述选择使用的无线接入技术信息为选择使用的无线接入技术或选择使用的无线接入技术对应的路径信息。
  13. 一种通信方法，其特征在于，包括：
    第一接入网设备确定服务质量QoS流的无线接入优先级信息，所述QoS流的无线接入优先级信息用于指示所述QoS流使用的无线接入技术的优先级；
    所述第一接入网设备根据所述QoS流的无线接入优先级信息，确定建立所述QoS流所使用的无线接入技术。
  14. 如权利要求13所述的方法，其特征在于，还包括：
    所述第一接入网设备确定的所述QoS流所使用的无线接入技术与所述第一接入网设备对应的无线接入技术相同，则所述第一接入网设备确定由所述第一接入网设备建立所述QoS流；或者，
    所述第一接入网设备确定的所述QoS流所使用的无线接入技术与所述第一接入网设备对应的无线接入技术不相同，则所述第一接入网设备确定由第二接入网设备建立所述QoS流；所述第一接入网设备和所述第二接入网设备分别为双连接场景中的主接入网设备和辅接入网设备。
  15. 如权利要求13或14所述的方法，其特征在于，还包括：
    所述第一接入网设备向会话管理网元发送第一信息，所述第一信息指示了接入网下行隧道信息，所述接入网下行隧道信息用于指示所述QoS流对应的下行隧道信息，所述接入网下行隧道信息为所述QoS流的无线接入优先级信息指示的优先使用的无线接入技术对应的接入网设备的下行隧道信息。
  16. 如权利要求15所述的方法，其特征在于，还包括：
    所述第一接入网设备从所述会话管理网元接收核心网上行隧道信息。
  17. 如权利要求13-16任一所述的方法，其特征在于，所述第一接入网设备确定QoS流的无线接入优先级信息，包括：
    所述第一接入网设备从会话管理网元接收所述QoS流的无线接入优先级信息；或者，
    所述第一接入网设备获取所述QoS流的5G QoS标识5QI或QoS属性值，根据所述5QI对应的无线接入优先级信息、或所述QoS属性值对应的无线接入优先级信息，确定所述QoS流的无线接入优先级信息。
  18. 如权利要求13-17任一所述的方法，其特征在于，所述QoS流使用的无线接入技术为演进的统一陆地无线接入EUTRA或新无线电NR。
  19. 一种通信装置，其特征在于，包括：
    处理单元，用于确定QoS流的无线接入优先级信息，所述QoS流的无线接入优先级信息用于指示所述QoS流的使用的无线接入技术的优先级；
    通信单元，用于向接入网设备发送所述QoS流的无线接入优先级信息，所述QoS流的无线接入优先级信息用于所述接入网设备确定建立所述QoS流所使用的无线接入技术。
  20. 如权利要求19所述的装置，其特征在于，所述处理单元，具体用于根据从策略控制网元接收的业务的无线接入优先级信息，确定所述QoS流的无线接入优先级信息，所述QoS流用于传输所述业务。
  21. 如权利要求19或20所述的装置，其特征在于，所述通信单元，还用于接收来自所述接入网设备的第一信息，所述第一信息指示了接入网下行隧道信息，所述接入网下行隧道信息用于指示所述QoS流对应的下行隧道信息，所述接入网下行隧道信息为所述QoS流的无线接入优先级信息指示的优先使用的无线接入技术对应的接入网设备的下行隧道信息；以及，向用户面网元发送所述接入网下行隧道信息。
  22. 如权利要求19-21任一所述的装置，其特征在于，所述通信单元，还用于向所述接入网设备发送核心网上行隧道信息。
  23. 如权利要求19所述的装置，其特征在于，所述处理单元，具体用于获取第二信息，所述第二信息为终端设备的会话的DNN，所述QoS流为所述会话的QoS流；根据所述第二信息对应的无线接入优先级信息，确定所述QoS流的无线接入优先级信息。
  24. 如权利要求23所述的装置，其特征在于，所述通信单元，用于向接入网设备发送QoS流的无线接入优先级信息，具体包括：
    用于向所述接入网设备发送N2会话管理信息，所述N2会话管理信息包括所述QoS流的无线接入优先级信息。
  25. 如权利要求19-24任一所述的装置，其特征在于，所述通信单元，还用于从所述接入网设备接收能力指示信息，所述能力指示信息用于指示支持双连接；
    所述处理单元，还用于根据所述能力指示信息，确定向所述接入网设备发送所述QoS流的无线接入优先级信息。
  26. 一种通信装置，其特征在于，包括：处理单元和通信单元；
    所述通信单元，用于从策略控制网元接收业务的无线接入优先级信息，所述业务的无线接入优先级信息用于指示所述业务使用的无线接入技术的优先级；
    所述处理单元，用于根据所述业务的无线接入优先级信息，确定第三信息，所述第三信息为接入网隧道信息或指示信息，所述指示信息用于指示选择使用的无线接入技术信息；
    所述通信单元，还用于向第一接入网设备发送所述第三信息。
  27. 如权利要求26所述的装置，其特征在于，在已经建立双连接的情形下，所述第一接入网设备为主接入网设备，第二接入网设备为辅接入网设备；
    当所述业务的无线接入优先级信息指示的所述业务优先使用的无线接入技术为所述第一接入网设备对应的无线接入技术，所述第三信息为所述第一接入网设备的接入网隧道信息；或，当所述业务的无线接入优先级信息指示的所述业务优先使用的无线接入技术为所述第二接入网设备对应的无线接入技术，所述第三信息为所述第二接入网设备的接入网隧道信息；或者，
    当所述业务的无线接入优先级信息指示的所述业务优先使用的无线接入技术为所述第一接入网设备对应的无线接入技术，所述第三信息为所述指示信息，所述指示信息用于指示选择使用的无线接入技术信息为所述第一接入网设备对应的无线接入技术信息；或，当所述业务的无线接入优先级信息指示的所述业务优先使用的无线接入技术为所述第二接入网设备对应的无线接入技术，所述第三信息为所述指示信息，所述指示信息用于指示选择使用的无线接入技术信息为所述第二接入网设备对应的无线接入技术信息。
  28. 如权利要求26所述的装置，其特征在于，在未建立双连接的情形下；
    当所述业务的无线接入优先级信息指示的所述业务优先使用的无线接入技术与所述第一接入网设备对应的无线接入技术相同，所述第三信息为所述指示信息，所述指示信息用于指示选择使用的无线接入技术信息为所述第一接入网设备对应的无线接入技术信息；
    当所述业务的无线接入优先级信息指示的所述业务优先使用的无线接入技术与所述第一接入网设备对应的无线接入技术不相同，所述第三信息为所述指示信息，所述指示信息用于指示选择使用的无线接入技术信息为目标无线接入技术信息，所述目标无线接入技术信息与所述第一接入网设备对应的无线接入技术信息不相同。
  29. 如权利要求26-28任一所述的装置，其特征在于，所述选择使用的无线接入技术信息为选择使用的无线接入技术或选择使用的无线接入技术对应的路径信息。
  30. 一种通信装置，其特征在于，包括：处理单元和通信单元；
    所述处理单元，用于确定服务质量QoS流的无线接入优先级信息，所述QoS流的无线接入优先级信息用于指示所述QoS流使用的无线接入技术的优先级；根据所述QoS流的无线接入优先级信息，确定建立所述QoS流所使用的无线接入技术。
  31. 如权利要求30所述的装置，其特征在于，所述处理单元，还用于：
    确定的所述QoS流所使用的无线接入技术与第一接入网设备对应的无线接入技术相同，则确定由第一接入网设备建立所述QoS流；或者，
    确定的所述QoS流所使用的无线接入技术与第一接入网设备对应的无线接入技术不相同，则确定由第二接入网设备建立所述QoS流；所述第一接入网设备和所述第二接入网设备分别为双连接场景中的主接入网设备和辅接入网设备。
  32. 如权利要求30或31所述的装置，其特征在于，所述通信单元，用于向会话管理 网元发送第一信息，所述第一信息指示了接入网下行隧道信息，所述接入网下行隧道信息用于指示所述QoS流对应的下行隧道信息，所述接入网下行隧道信息为所述QoS流的无线接入优先级信息指示的优先使用的无线接入技术对应的接入网设备的下行隧道信息。
  33. 如权利要求32所述的装置，其特征在于，所述通信单元，还用于从所述会话管理网元接收核心网上行隧道信息。
  34. 如权利要求30-33任一所述的装置，其特征在于，所述处理单元，用于确定QoS流的无线接入优先级信息，具体包括：
    通过所述通信单元从会话管理网元接收所述QoS流的无线接入优先级信息；或者，
    通过所述通信单元获取所述QoS流的5G QoS标识5QI或QoS属性值，根据所述5QI对应的无线接入优先级信息、或所述QoS属性值对应的无线接入优先级信息，确定所述QoS流的无线接入优先级信息。
  35. 如权利要求30-34任一所述的装置，其特征在于，所述QoS流使用的无线接入技术为演进的统一陆地无线接入EUTRA或新无线电NR。
  36. 一种通信系统，其特征在于，包括会话管理网元和接入网设备；
    所述会话管理网元，用于确定QoS流的无线接入优先级信息，所述QoS流的无线接入优先级信息用于指示所述QoS流使用的无线接入技术的优先级；以及，向所述接入网设备发送QoS流的无线接入优先级信息；
    所述接入网设备，用于根据所述QoS流的无线接入优先级信息，确定建立所述QoS流所使用的无线接入技术。
  37. 如权利要求36所述的系统，其特征在于，所述系统还包括策略控制网元，用于从应用功能网元接收业务的无线接入倾向信息，所述无线接入倾向信息用于指示所述业务倾向使用的无线接入技术的优先级；根据所述无线接入倾向信息，确定所述业务的无线接入优先级信息；或者，用于根据所述业务的签约信息和/或所述业务对应于不同无线接入技术的业务体验信息，确定所述业务的无线接入优先级信息；
    所述会话管理网元，用于确定QoS流的无线接入优先级信息，具体包括：用于根据从所述策略控制网元接收的所述业务的无线接入优先级信息，确定所述QoS流的无线接入优先级信息，所述QoS流用于传输所述业务。
  38. 如权利要求37所述的系统，其特征在于，所述策略控制网元，还用于从所述会话管理网元接收能力指示信息，所述能力指示信息用于指示支持双连接；根据所述能力指示信息，确定向所述会话管理网元发送所述业务的无线接入优先级信息。
  39. 如权利要求36-38任一所述的系统，其特征在于，所述会话管理网元，还用于接收来自所述接入网设备的第一信息，所述第一信息指示了接入网下行隧道信息，所述接入网下行隧道信息用于指示所述QoS流对应的下行隧道信息，所述接入网下行隧道信息为所述QoS流的无线接入优先级信息指示的优先使用的无线接入技术对应的接入网设备的下行隧道信息；向用户面网元发送所述接入网下行隧道信息。
  40. 如权利要求36所述的系统，其特征在于，所述会话管理网元，用于确定QoS流的无线接入优先级信息，具体包括：用于获取第二信息，所述第二信息为终端设备的会话的数据网络名称DNN，所述QoS流为所述会话的QoS流；以及，根据所述第二信息对应的无线接入优先级信息，确定所述QoS流的无线接入优先级信息。
  41. 如权利要求40所述的系统，其特征在于，所述会话管理网元，用于向所述接入 网设备发送QoS流的无线接入优先级信息，具体包括：用于向所述接入网设备发送N2会话管理信息，所述N2会话管理信息包括所述QoS流的无线接入优先级信息。
  42. 一种通信系统，其特征在于，包括会话管理网元和策略控制网元；
    所述策略控制网元，用于向所述会话管理网元发送业务的无线接入优先级信息，所述业务的无线接入优先级信息用于指示所述业务使用的无线接入技术的优先级；
    所述会话管理网元，用于根据所述业务的无线接入优先级信息，确定第三信息，所述第三信息为接入网隧道信息或指示信息，所述指示信息用于指示选择使用的无线接入技术信息；以及，向第一接入网设备发送所述第三信息。
  43. 如权利要求42所述的系统，其特征在于，在已经建立双连接的情形下，所述第一接入网设备为主接入网设备，第二接入网设备为辅接入网设备；
    当所述业务的无线接入优先级信息指示的所述业务优先使用的无线接入技术为所述第一接入网设备对应的无线接入技术，所述第三信息为所述第一接入网设备的接入网隧道信息；或，当所述业务的无线接入优先级信息指示的所述业务优先使用的无线接入技术为所述第二接入网设备对应的无线接入技术，所述第三信息为所述第二接入网设备的接入网隧道信息；或者，
    当所述业务的无线接入优先级信息指示的所述业务优先使用的无线接入技术为所述第一接入网设备对应的无线接入技术，所述第三信息为所述指示信息，所述指示信息用于指示选择使用的无线接入技术信息为所述第一接入网设备对应的无线接入技术信息；或，当所述业务的无线接入优先级信息指示的所述业务优先使用的无线接入技术为所述第二接入网设备对应的无线接入技术，所述第三信息为所述指示信息，所述指示信息用于指示选择使用的无线接入技术信息为所述第二接入网设备对应的无线接入技术信息。
  44. 如权利要求42所述的系统，其特征在于，在未建立双连接的情形下；
    当所述业务的无线接入优先级信息指示的所述业务优先使用的无线接入技术与所述第一接入网设备对应的无线接入技术相同，所述第三信息为所述指示信息，所述指示信息用于指示选择使用的无线接入技术信息为所述第一接入网设备对应的无线接入技术信息；
    当所述业务的无线接入优先级信息指示的所述业务优先使用的无线接入技术与所述第一接入网设备对应的无线接入技术不相同，所述第三信息为所述指示信息，所述指示信息用于指示选择使用的无线接入技术为目标无线接入技术信息，所述目标无线接入技术信息与所述第一接入网设备对应的无线接入技术信息不相同。
  45. 如权利要求42-44任一所述的系统，其特征在于，所述策略控制网元，还用于从应用功能网元接收所述业务的无线接入倾向信息，所述无线接入倾向信息用于指示所述业务倾向使用的无线接入技术的优先级；根据所述无线接入倾向信息，确定所述业务的无线接入优先级信息；或者，用于根据所述业务的签约信息和/或所述业务对应于不同无线接入技术的业务体验信息，确定所述业务的无线接入优先级信息。
  46. 如权利要求42-45任一所述的系统，其特征在于，所述选择使用的无线接入技术信息为选择使用的无线接入技术或选择使用的无线接入技术对应的路径信息。
  47. 一种通信装置，其特征在于，包括：处理器和接口电路，所述处理器用于通过所述接口电路实现通信，并执行如权利要求1-18任一所述的方法。
  48. 一种通信装置，其特征在于，处理器和存储器，其中，所述存储器用于存储计算机可执行指令，当所述处理器执行所述计算机可执行指令时，使所述装置执行如权利要求 1-18任一所述的方法。
  49. 一种存储介质，其上存储有计算机程序或指令，其特征在于，所述计算机程序或指令被执行时使得处理器执行如权利要求1-18任一所述的方法。
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