WO2022105785A1 - 无线连接建立方法及通信装置 - Google Patents

无线连接建立方法及通信装置 Download PDF

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Publication number
WO2022105785A1
WO2022105785A1 PCT/CN2021/131173 CN2021131173W WO2022105785A1 WO 2022105785 A1 WO2022105785 A1 WO 2022105785A1 CN 2021131173 W CN2021131173 W CN 2021131173W WO 2022105785 A1 WO2022105785 A1 WO 2022105785A1
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Prior art keywords
wireless connection
pdu session
request
establishment
network element
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PCT/CN2021/131173
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English (en)
French (fr)
Inventor
席国宝
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华为技术有限公司
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Publication of WO2022105785A1 publication Critical patent/WO2022105785A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections

Definitions

  • the present application relates to the field of communication technologies, and in particular, to a method and apparatus for establishing a wireless connection.
  • a wireless connection in a fifth-generation (5th-generation, 5G ) communication system may be a wireless connection of a protocol data unit (PDU) session.
  • the PDU session refers to a process of communication between a user equipment (user equipment, UE) and a data network (data network, DN), and the wireless connection of the PDU session refers to a data transmission channel between the UE and the DN.
  • the wireless connection of the PDU session may include data transmission channels between the UE and the access network and between the access network and the user plane function (UPF) network element .
  • SA access stratum
  • UPF user plane function
  • the 5G system establishes the wireless connection of the PDU session on demand.
  • the UE establishes the wireless connection of the PDU session related to the service according to the service requirements.
  • This mechanism of establishing a wireless connection of PDU sessions on demand may increase the delay.
  • the wireless connection of the PDU session of the data service has been established between the UE and the DN, but during the transmission of the data service through the wireless connection, the UE initiates the calling voice service, and the wireless connection of the PDU session of the voice service needs to be established. Thereby increasing the call delay.
  • the present application provides a method and a communication device for establishing a wireless connection, which can simplify the establishment process of multiple wireless connections, thereby reducing time delay.
  • the present application provides a method for establishing a wireless connection.
  • the method may be executed by an access management network element, or may also be executed by a chip configured in the access management network element, which is not limited in this application.
  • the method includes: the access management network element receives a first establishment request from the user equipment, where the first establishment request is used to request the establishment of the first wireless connection; determining that the second wireless connection with the persistent online attribute is not established; triggering the first establishment request The establishment of a wireless connection triggers the establishment of a second wireless connection.
  • the establishment of the second wireless connection with the permanent online attribute can be triggered, and the establishment of the second wireless connection does not need to be initiated by the user equipment, thereby simplifying the establishment of multiple wireless connections.
  • the connection establishment process reduces the delay.
  • the first wireless connection is a wireless connection of the first PDU session
  • the second wireless connection is a wireless connection of the second PDU session.
  • the first wireless connection is a wireless connection of a non-PDU session
  • the second wireless connection is a wireless connection of a PDU session.
  • Wireless connections for non-PDU sessions such as signaling connections.
  • the access management network element can automatically establish the wireless connection of the PDU session with the persistent online attribute, without the need for the user equipment to initiate the establishment of the wireless connection of the PDU session, thereby reducing the number of PDU sessions. How long the wireless connection was established.
  • the access management network element receives a session establishment request, the session establishment request is used to request the establishment of a PDU session, and when the identifier corresponding to the PDU session matches the specified identifier list, the The inbound management network element records that the PDU session has a permanent online attribute, and the wireless connection corresponding to the PDU session also has a permanent online attribute, so that when the user equipment initiates the first wireless connection, the establishment of the second wireless connection can be triggered.
  • the identifier corresponding to the PDU session is a data network name (data network name, DNN), and the above-mentioned designated identifier list is a designated DNN list.
  • DNN data network name
  • the wireless connection corresponding to the DNN included in the specified DNN list has the property of being permanently online.
  • the access management network element judges whether the wireless connection has a permanent online attribute according to the specified DNN list, which is easy to implement and has high accuracy.
  • the identifier corresponding to the PDU session is a PDU session identifier (PDU session identify, PSI), and the above-mentioned designated identifier list is a designated PSI list.
  • PSI PDU session identify
  • the wireless connection of the PDU session corresponding to the PSI included in the specified PSI list has a permanent online attribute.
  • the access management network element judges whether the wireless connection has a permanent online attribute according to the specified PSI list, which is easy to implement.
  • the access management network element sends a re-registration notification to the user equipment when it detects that the second session management network element corresponding to the second wireless connection is faulty, and re-registers
  • the notification is used to notify the user equipment to send a re-registration request; to receive a re-registration request from the user equipment, the re-registration request is used to request to re-establish the second wireless connection; according to the re-registration request, the establishment of the second wireless connection is re-triggered.
  • the access management network element detects that the second session management network element is faulty, it directly triggers the user equipment to send a re-registration request to re-establish the wireless connection of the second PDU session and ensure the normal progress of the second PDU session.
  • the access management network element sends a re-registration notification to the user equipment when receiving a re-registration notification from the session management network element, and the re-registration notification is used to notify the user
  • the device sends a re-registration request; receives a re-registration request from the user equipment, where the re-registration request is used to request re-establishment of the second wireless connection; and re-triggers establishment of the second wireless connection according to the re-registration request.
  • the session management network element sends a re-registration notification to the access management network element in the case of detecting a failure of the user plane network element to trigger the user equipment to send a re-registration request, thereby re-establishing the wireless connection of the second PDU session, Ensure the normal progress of the second PDU session.
  • the present application further provides a communication device.
  • the communication device has part or all of the functions of implementing the access management network element described in the first aspect.
  • the functions of the apparatus may have the functions of some or all of the embodiments of the access management network element in this application, and may also have the functions of independently implementing any one of the embodiments of this application.
  • the functions can be implemented by hardware, or can be implemented by hardware executing corresponding software.
  • the hardware or software includes one or more units or modules corresponding to the above functions.
  • the structure of the communication device may include a processing unit and a communication unit, and the processing unit is configured to support the communication device to perform the corresponding functions in the above method.
  • the communication unit is used to support communication between the communication device and other devices.
  • the communication device may also include a storage unit for coupling with the processing unit and the communication unit, which stores program instructions and data necessary for the communication device.
  • the communication device includes:
  • a communication unit configured to receive a first establishment request from the user equipment, where the first establishment request is used to request to establish a first wireless connection;
  • the processing unit is configured to determine that the second wireless connection with the permanent online attribute is not established; trigger the establishment of the first wireless connection, and trigger the establishment of the second wireless connection.
  • the communication device may include:
  • the processor is configured to receive, through the transceiver, a first establishment request from the user equipment, where the first establishment request is used to request the establishment of a first wireless connection; determine that a second wireless connection with a permanent online attribute is not established; trigger the first wireless connection is established, and triggers the establishment of a second wireless connection.
  • the processor may be used to perform, for example but not limited to, baseband related processing
  • the transceiver may be used to perform, for example but not limited to, radio frequency transceiving.
  • the above-mentioned devices may be respectively arranged on chips that are independent of each other, or at least part or all of them may be arranged on the same chip.
  • processors can be further divided into analog baseband processors and digital baseband processors.
  • the analog baseband processor can be integrated with the transceiver on the same chip, and the digital baseband processor can be set on a separate chip. With the continuous development of integrated circuit technology, more and more devices can be integrated on the same chip.
  • a digital baseband processor can be integrated with a variety of application processors (such as but not limited to graphics processors, multimedia processors, etc.) on the same chip.
  • application processors such as but not limited to graphics processors, multimedia processors, etc.
  • Such a chip may be called a System on Chip. Whether each device is independently arranged on different chips or integrated on one or more chips often depends on the needs of product design. The embodiments of the present application do not limit the implementation form of the foregoing device.
  • the present application further provides a processor for executing the above various methods.
  • the process of sending and receiving the above-mentioned information in the above-mentioned methods can be understood as the process of outputting the above-mentioned information by the processor and the process of receiving the above-mentioned information input by the processor.
  • the processor When outputting the above-mentioned information, the processor outputs the above-mentioned information to the transceiver for transmission by the transceiver. After the above-mentioned information is output by the processor, other processing may be required before reaching the transceiver.
  • the transceiver receives the above-mentioned information and inputs it into the processor. Furthermore, after the transceiver receives the above-mentioned information, the above-mentioned information may need to perform other processing before being input to the processor.
  • the sending of the establishment request mentioned in the foregoing method can be understood as the processor outputting the establishment request.
  • the above-mentioned processor may be a processor specially used to execute these methods, or may be a processor that executes computer instructions in a memory to execute these methods, such as a general-purpose processor.
  • the above-mentioned memory can be a non-transitory (non-transitory) memory, such as a read-only memory (Read Only Memory, ROM), which can be integrated with the processor on the same chip, or can be set on different chips respectively.
  • ROM read-only memory
  • the embodiment does not limit the type of the memory and the setting manner of the memory and the processor.
  • the present application provides a computer-readable storage medium for storing computer software instructions, and when the instructions are executed by a computer, the method described in the first aspect above is implemented.
  • the present application also provides a computer program product comprising instructions, which, when run on a computer, cause the computer to perform the method described in the first aspect.
  • the present application provides a chip system, the chip system including at least one processor and a communication interface for executing a computer program, the communication interface for inputting and/or outputting information such that The access management network element implements the functions involved in the first aspect.
  • the chip system further includes a memory for storing necessary program instructions and data for accessing the management network element.
  • the chip system may be composed of chips, or may include chips and other discrete devices.
  • Figure 1 is a schematic diagram of the network architecture of the 5G system
  • FIG. 2 is a schematic flowchart of establishing a wireless connection of a PDU session
  • 3 is a schematic flowchart of establishing a wireless connection of two PDU sessions
  • FIG. 4 is a schematic diagram of a network architecture applying the present application.
  • FIG. 5 is a schematic flowchart of a method for establishing a wireless connection provided by the present application.
  • FIG. 6 is a schematic flowchart of another method for establishing a wireless connection provided by the present application.
  • FIG. 7 is a schematic flowchart of another method for establishing a wireless connection provided by the present application.
  • FIG. 8 is a schematic flowchart of another method for establishing a wireless connection provided by the present application.
  • FIG. 9 is a schematic structural diagram of a communication device provided by the present application.
  • FIG. 10 is another schematic structural diagram of the communication device provided by the present application.
  • FIG. 1 is a schematic diagram of a network architecture of a 5G system.
  • the network architecture includes a UE, an access network (AN) device, a core network element, and a DN.
  • AN access network
  • DN DN
  • the access network device may also be a radio access network (radio access network, RAN) device.
  • the access network device may include a base station (base station, BS), which may be a device deployed in a wireless access network and capable of wirelessly communicating with terminal devices.
  • the base station may have various forms, such as a macro base station, a micro base station, a relay station, and an access point.
  • the access network equipment involved in the embodiments of the present application may be a base station in 5G or a base station in long term evolution (LTE), where the base station in 5G may also be referred to as a transmission and reception point (transmission and reception point). reception point, TRP) or next generation Node B (gNB).
  • LTE long term evolution
  • TRP transmission and reception point
  • gNB next generation Node B
  • the core network network elements may include these network elements: user plane function (UPF), access and mobility management function (AMF), session management function (session management function, SMF) , policy control function (PCF), application function (application, AF), authentication server function (authentication server function, AUSF), network slice selection function (network slice selection function, NSSF) and unified data management (unified data management).
  • UPF user plane function
  • AMF access and mobility management function
  • SMF session management function
  • PCF policy control function
  • application function application, AF
  • authentication server function authentication server function
  • NSSF network slice selection function
  • unified data management unified data management
  • AMF network element the termination point of non-access stratum (non-access stratum, NAS) signaling, is mainly responsible for user access and mobility management.
  • the UE and the AMF can communicate through the N1NAS message, and can also transfer through the N2 message of the RAN.
  • RAN and AMF communicate through N2 messages.
  • the SMF network element is responsible for managing the creation and deletion of user PDU sessions, and maintaining the PDU session context and user plane forwarding pipe information.
  • the NSSF network element is used to support information such as network slice selection assistance information (NSSAI), user location area, slice capacity, slice current load and other information based on user requests and subscriptions for flexible selection of slices.
  • NSSAI network slice selection assistance information
  • the PCF network element is used to generate and manage users, sessions, and quality of service (quality of service, QoS) flow processing policies.
  • the UDM network element is used to manage user subscription information and complete user authentication and authorization.
  • the AF network element which provides application services, can be located in the operator's network or outside the operator's network.
  • the schematic diagram of the network architecture shown in FIG. 1 also includes interfaces between various network elements.
  • N2 represents an interface between an AMF network element and a RAN device.
  • the process of communication between UE and DN the process of communication between UE and DN; wireless connection of PDU session, data transmission channel between UE and DN.
  • the establishment of the PDU session is the establishment of the wireless connection of the PDU.
  • the wireless connection of the PDU session may include data transmission channels between the UE and the AN and between the AN and the UPF network element.
  • the process of establishing a wireless connection of a PDU session can be referred to as shown in FIG. 2 , and the process shown in FIG. 2 may include but not limited to the following steps:
  • Step 1 the UE sends a PDU session establishment request to the AMF network element.
  • the AMF network element receives the PDU session establishment request from the UE.
  • the UE initiates a PDU session establishment process by sending a PDU session establishment request to the AMF network element.
  • the PDU session establishment request may include a PDU session identification (PDU session identify, PSI).
  • a PDU session establishment request may be a PDU Session Establishment Request.
  • the UE can send a PDU session establishment request to the AMF network element through a non-access stratum (NAS) message, that is, the UE sends a PDU session establishment request to the R(AN), and the R(AN) sends a PDU session to the AMF network element.
  • NAS non-access stratum
  • the UE directly requests the AMF network element PDU session establishment through the AS message.
  • Step 2 the AMF network element selects the SMF network element.
  • Step 3 the AMF network element sends a PDU session context information establishment request to the SMF network element.
  • the SMF network element receives the PDU session context information establishment request from the AMF network element.
  • the PDU session context information establishment request is used to request the SMF network element to establish the context information of the PDU session, which can be Nsmf_PDUSession_CreateSMContext Request.
  • Step 4 the SMF network element obtains subscription information or updates the subscription information from the UDM network element.
  • Step 5 the SMF network element sends a PDU session context information establishment response to the AMF network element.
  • the AMF network element receives the PDU session context information establishment response from the SMF network element.
  • the PDU session context information establishment response is used to respond to the PDU session context information establishment request, which may be Nsmf_PDUSession_CreateSMContext Response.
  • Step 6 the SMF network element selects the UPF network element.
  • Step 7 the SMF network element and the UPF network element create an N4 session.
  • Step 8 the SMF network element sends a N1N2 transfer message to the AMF network element.
  • the AMF network element receives the N1N2 transfer message from the SMF network element.
  • the N1N2 transfer message may be Namf_Communication_N1N2MessageTransfer.
  • Step 9 the AMF network element sends an N2 PDU session request to the R(AN).
  • the R(AN) receives the N2 PDU session request from the AMF network element.
  • the N2 PDU session request may be an N2 PDU Session Request.
  • the N2 PDU session request is a non-access stratum NAS message.
  • Step 10 the R(AN) and the UE perform special resource establishment.
  • the R(AN) sends a PDU session establishment acceptance to the UE for responding to the PDU session establishment request in step 1.
  • PDU Session Establishment Accept can be PDU Session Establishment Accept.
  • Step 11 the R(AN) sends an N2 PDU session response to the AMF network element.
  • the AMF network element receives the N2 PDU session response from the R(AN).
  • the N2 PDU Session Response may be an N2 PDU Session Response.
  • the data service of the UE is frequent.
  • the UE initiates the calling voice service and needs to establish a wireless connection for the PDU session of the voice service.
  • Figure 3 The shown process can include but is not limited to the following steps:
  • Step 301 the UE sends a first PDU session establishment request to the AMF network element.
  • the AMF network element receives the first PDU session establishment request from the UE.
  • uplink data status uplink data status
  • Step 302 the AMF network element sends a PDU session context information update request to the SMF network element.
  • the SMF network element receives the PDU session context information update request from the AMF network element.
  • the PDU session context information update request is used to request the SMF network element to update the context information of the PDU session, which may be Nsmf_PDUSession_UpdateSMContext Request.
  • step 302 The difference between step 302 and step 3 is that Fig. 2 requests to establish a PDU session that has not been established before, so step 3 is a request for establishing PDU session context information, and Fig. 3 requests to establish a PDU session of a previously established data service, so Step 302 is a PDU session context information update request.
  • Step 303 establishing a wireless connection of the first PDU session.
  • step 303 reference may be made to the process from step 4 to step 11 in FIG. 2, and details are not repeated here.
  • the first PDU session is the PDU session of the data service.
  • Step 304 the UE sends data service data.
  • the UE sends the data service data to the DN corresponding to the data service through the wireless connection of the first PDU session.
  • Step 305 the UE sends a second PDU session establishment request to the AMF network element.
  • the AMF network element receives the second PDU session establishment request from the UE.
  • Step 306 the AMF network element sends a PDU session context information update request to the SMF network element.
  • the SMF network element receives the PDU session context information update request from the AMF network element.
  • Step 307 establishing a wireless connection of the second PDU session.
  • step 307 reference may be made to the process from step 4 to step 11 in FIG. 2, and details are not described herein again.
  • the second PDU session is the PDU session of the voice service.
  • Step 308 the UE sends IP multimedia subsystem (IP multimedia subsystem, IMS) session initiation protocol (session initiation protocol, SIP) signaling data.
  • IP multimedia subsystem IP multimedia subsystem, IMS
  • IMS IP multimedia subsystem
  • SIP session initiation protocol
  • step 304 initiates a voice service for the UE. If the UE is called, the UE executes step 304 when receiving a call request from the network element of the AMF.
  • the PDU session with the always-on attribute is introduced, which is defined as: every time it transitions from the idle state to the connected state, it has an always-on Attributed PDU sessions are required to acquire user plane resources.
  • the first PDU session establishment request sent by the UE to the AMF network element may indicate a request to establish the first PDU session with the always-on attribute, and the core network network element (for example, the SMF network Element) records that the first PDU session has the always-on attribute in the context information of the first PDU session.
  • the AMF network element not only triggers the establishment of the wireless connection of the second PDU session, but also triggers the establishment of the wireless connection of the first PDU session.
  • the AMF network element not only triggers the establishment of the wireless connection of the non-PDU session, but also triggers the establishment of the wireless connection of the first PDU session. This implementation depends on the UE being able to instruct a request to establish a PDU session with the always-on attribute.
  • the UE when the data service is in the connected state, the UE initiates the wireless connection of the PDU session of the voice service to realize the simultaneous execution of the data service and the voice service, but at the expense of increasing the call delay of the voice service.
  • the AMF network element triggers the establishment of a PDU session with the always-on attribute, depending on the UE being able to instruct the request to establish a PDU session with the always-on attribute.
  • the present application provides a method and apparatus for establishing a wireless connection, which can simplify the establishment process of multiple wireless connections, thereby reducing the time delay.
  • the AMF network element can automatically trigger the establishment of the wireless connection of the PDU session of the voice service, without the need for the UE to initiate the establishment of the PDU session of the voice service, nor the need for the UE to indicate that the PDU session of the voice service has always -on attribute.
  • a, b, or c may represent: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, c Can be single or multiple.
  • words such as “first” and “second” are used to distinguish technical features with substantially the same or similar functions. Those skilled in the art can understand that the words “first”, “second” and the like do not limit the quantity and execution order, and the words “first”, “second” and the like are not necessarily different.
  • the techniques described in this application can be used in various communication systems, such as a 4th generation (4G) communication system, a 4.5G communication system, a 5G communication system, a system where multiple communication systems are converged, or a communication system that evolves in the future.
  • 4G 4th generation
  • 4.5G communication system
  • 5G 5th generation
  • LTE long term evolution
  • NR new radio
  • WiFi wireless-fidelity
  • 3GPP 3rd generation partnership project
  • the UE (also referred to as a terminal) involved in this application can be a device with wireless transceiver function, which can be deployed on land, including indoor or outdoor, handheld or vehicle-mounted; it can also be deployed on water (such as ships, etc.); It can also be deployed in the air (eg on airplanes, balloons, satellites, etc.).
  • UEs include handheld devices, in-vehicle devices, wearable devices or computing devices with wireless communication capabilities.
  • the UE may be a mobile phone, a tablet computer, or a computer with a wireless transceiver function.
  • the terminal device may also be a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a smart vehicle (smart vehicle) terminal device, a wireless terminal in industrial control, and a wireless terminal in driverless driving.
  • VR virtual reality
  • AR augmented reality
  • smart vehicle smart vehicle
  • wireless terminals in industrial control wireless terminals in smart homes, and so on.
  • the UE may be a wearable device.
  • Wearable devices can also be called wearable smart devices, which are the general term for the intelligent design of daily wear and the development of wearable devices using wearable technology, such as glasses, gloves, watches, clothing and shoes.
  • a wearable device is a portable device that is worn directly on the body or integrated into the user's clothing or accessories.
  • Wearable device is not only a hardware device, but also realizes powerful functions through software support, data interaction, and cloud interaction.
  • wearable smart devices include full-featured, large-scale, complete or partial functions without relying on smart phones, such as smart watches or smart glasses, and only focus on a certain type of application function, which needs to cooperate with other devices such as smart phones. Use, such as all kinds of smart bracelets, smart jewelry, etc. for physical sign monitoring.
  • UE may be a terminal in the Internet of Things (IoT) system.
  • IoT Internet of Things
  • the terminal in this application may be a terminal in machine type communication (MTC).
  • MTC machine type communication
  • the terminal of the present application may be an on-board module, on-board module, on-board component, on-board chip or on-board unit built into the vehicle as one or more components or units, and the vehicle passes through the built-in on-board module, on-board module, on-board component , on-board chip or on-board unit can implement the method of the present application. Therefore, the present application can be applied to the Internet of Vehicles, such as vehicle to everything (V2X), long term evolution vehicle (LTE-V), vehicle to vehicle (V2V), etc.
  • V2X vehicle to everything
  • LTE-V long term evolution vehicle
  • V2V vehicle to vehicle
  • FIG. 4 is a schematic diagram of a network architecture to which the present application is applied.
  • the network architecture shown in FIG. 4 includes an access management network element 401 and a UE 402.
  • the access management network element 401 may be the AMF network element in FIG. 1 , or may be a network element having the same function as the AMF network element in the future communication system.
  • the access management network element 401 receives the first establishment request from the UE 402, the first establishment request is used to request the establishment of the first wireless connection, and in response to the first establishment request, triggers the establishment of the first wireless connection;
  • the incoming management network element 401 determines that the second wireless connection with the persistent online attribute is not established, and triggers the establishment of the second wireless connection.
  • the second wireless connection may be established simultaneously with the first wireless connection, or the second wireless connection may be established during the establishment of the first wireless connection, or the second wireless connection may be established when the establishment of the first wireless connection is completed.
  • the first wireless connection and the second wireless connection may both be wireless connections of PDU sessions, but are wireless connections of different types of PDU sessions.
  • the first wireless connection may be a non-PDU session wireless connection
  • the second wireless connection may be a PDU session wireless connection.
  • the number of the second wireless connection is not limited to one, and the specific number depends on the situation.
  • the establishment of the second wireless connection is not triggered by the establishment request for the second wireless connection sent by the UE 402, so that the establishment process of multiple wireless connections can be simplified. There is no need for the UE 402 to indicate that the second wireless connection has a permanent online attribute, thereby realizing the decoupling of the UE 402 and having a wider application range.
  • the network architecture shown in FIG. 4 further includes an access network device 403, and the access network device 403 may be a gNB in a 5G system.
  • the access network device 403 is located between the UE 402 and the access management network element 401.
  • the access network device 403 is used to forward the message sent by the UE 402 to the access management network element 401, or the message forwarded by the access management network element 401 to the UE 402.
  • the network architecture shown in FIG. 4 further includes a session management network element 404.
  • the session management network element 404 may be the SMF network element in FIG. 1, or may be a network element having the same function as the SMF network element in the future communication system. Yuan. Applied in this application, when the access management network element 401 detects that the session management network element 404 corresponding to the second wireless connection is faulty, or the session management network element 404 is unreachable, it notifies the UE 402 to send a re-registration request; When receiving the re-registration request, the access management network element 401 re-triggers the establishment of the second wireless connection, so that the service corresponding to the second wireless connection can be quickly restored.
  • the network architecture shown in FIG. 4 further includes a user plane network element 405.
  • the user plane network element 405 may be the UPF network element in FIG. 1, or may be a network element having the same function as the UPF network element in the future communication system. Yuan. Applied in this application, when the session management network element 404 detects that the user plane network element 405 corresponding to the second wireless connection is faulty, or the user plane network element 405 is unreachable, it notifies the UE 402 through the access management network element 401. A re-registration request is sent; when receiving the re-registration request, the access management network element 401 re-triggers the establishment of the second wireless connection, so that the service corresponding to the second wireless connection can be quickly recovered.
  • the access management network element takes the AMF network element as an example. It should be noted that the names of information or data exchanged between network elements or between network elements and devices are used as examples, and do not constitute a limitation to this application.
  • FIG. 5 is a schematic flowchart of a method for establishing a wireless connection provided by the present application.
  • the process may include but is not limited to the following steps:
  • Step 500a the AMF network element determines the specified identifier list.
  • the specified identification list is used to determine whether the wireless connection has the always-on-line attribute.
  • the specified ID list can be preconfigured on the AMF network element, or set by the administrator of the AMF network element.
  • the specified identification list is a specified data network name (data network name, DNN) list
  • the specified DNN list may include one or more DNNs with a permanent online attribute.
  • the specified DNN list includes DNNs corresponding to voice services. A certain DNN has a permanently online attribute, and then its corresponding PDU session has a permanently online attribute, and the wireless connection corresponding to the PDU session also has a permanently online attribute.
  • the specified identifier list may be a specified PSI list, and the specified PSI list may include one or more PSIs of PDU sessions with the always-online attribute .
  • the specified PSI list includes the PSI corresponding to the PDU session of the voice service. A certain PSI has the always-on attribute, and thus the wireless connection of the identified PDU session has the always-on attribute.
  • the specified identifier list may also be a list of tunnel identifiers between the UPF network element and the DNN, or other information lists for identifying DNs.
  • Step 500b the UE sends a session establishment request to the AMF network element.
  • the AMF network element receives the session establishment request from the UE.
  • the session establishment request is used to request to establish a PDU session. Further, in the process of establishing the PDU session, a wireless connection of the PDU session may be established.
  • the session establishment request may carry the PSI of the PDU session to indicate the type of the PDU session.
  • a session establishment request is sent to the AMF network element to establish a PDU session.
  • the wireless connection of the PDU session can be continuously established or released.
  • the wireless connection of the PDU session can be established by opening the web page, and the wireless connection of the PDU session can be released by closing the web page;
  • the wireless connection of the PDU session can be established by making or connecting the phone, and the wireless connection of the PDU session can be released by hanging up the phone.
  • the UE may directly send the session establishment request to the AMF network element, or may send the session establishment request to the AMF network element through the access network device.
  • Step 500c when the identifier corresponding to the PDU session matches the specified identifier list, the AMF network element records that the PDU session has a permanent online attribute.
  • the AMF network element matches the identifier corresponding to the PDU session with the specified identifier list to identify whether the PDU session has the permanent online attribute, and when it identifies that the PDU session has the permanent online attribute next, record that the PDU session has the always-online attribute. Further, the AMF network element may record that the wireless connection corresponding to the PDU session has a permanent online attribute.
  • the designated identifier list is a designated DNN list
  • the second identifier corresponding to the PDU session is the DNN corresponding to the PDU session (one PDU session corresponds to one DNN).
  • the AMF network element judges whether the DNN is in the specified DNN list. If it is, the DNN matches the specified DNN list, the PDU session has the permanent online attribute, and the wireless connection corresponding to the PDU session has the permanent online attribute; The specified DNN list does not match, the PDU session does not have the permanently online attribute, and the wireless connection corresponding to the PDU session does not have the permanent online attribute.
  • steps 501 to 504 can be performed.
  • the wireless connection of the PDU session is established, thereby simplifying the establishment process of multiple wireless connections and reducing the delay.
  • the PDU session and the wireless connection of the PDU session are established according to the flow shown in FIG. 3 .
  • steps 500a to 500b are preconditions for performing steps 501 to 504, and steps 501 to 504 are to establish the first wireless connection and the second wireless connection when the UE requests to establish the first wireless connection.
  • the AMF network element sets the specified DNN list or the specified PSI list, and does not need the UE to indicate in the second establishment request that the second wireless connection has a permanent online attribute, and the application scope is wider.
  • Step 501 the UE sends a first establishment request to the AMF network element.
  • the AMF network element receives the first establishment request from the UE.
  • the first establishment request is used to request the establishment of a first wireless connection
  • the first wireless connection may be a wireless connection of a first PDU session, or a wireless connection of a non-PDU session, such as a signaling connection or a radio resource control (radio resource control) connection. , RRC) connection.
  • RRC radio resource control
  • the first establishment request may carry the PSI of the first PDU session to indicate the type of the first PDU session.
  • the UE may send a first establishment request to the AMF network element when it is powered on or started for the first time, where the first establishment request is used to request the establishment of the first PDU session and the wireless connection of the first PDU session.
  • the UE may send a first establishment request to the AMF network element when performing operations related to the first PDU session (such as opening a webpage or making a phone call, etc.), where the first establishment request is used to request to establish a wireless connection for the first PDU session.
  • the UE may directly send the first establishment request to the AMF network element, or may send the first establishment request to the AMF network element through the access network device.
  • Step 502 the AMF network element determines that the second wireless connection with the persistent online attribute is not established.
  • step 500b the AMF network element identifies and records that the wireless connection of the PDU session has a permanent online attribute, then the AMF network element can determine, according to its record information and the currently established wireless connection, that there is no permanent online connection established. Properties of the second wireless connection.
  • the DNNs corresponding to the currently established wireless connections include DNN 1 to DNN 3, and their record information indicates that DNN 1 to DNN 5 have permanent online attributes, then the AMF network element can determine that the wireless connections corresponding to DNN 4 and DNN 5 have not been established, And the two wireless connections have always-on properties. Then the second wireless connection includes the wireless connection corresponding to DNN4 and the wireless connection corresponding to DNN5.
  • the AMF network element determines that the second wireless connection with the permanently online attribute is not established according to the currently established wireless connection and the specified DNN list or the specified PSI list.
  • the DNNs corresponding to the currently established wireless connections include DNN 1 to DNN 3, and the specified DNN list includes DNN 1 to DNN 5, then the AMF network element can determine that the wireless connections corresponding to DNN 4 and DNN 5 have not been established, and the two Wireless connections have always-on properties. Then the second wireless connection includes the wireless connection corresponding to DNN4 and the wireless connection corresponding to DNN5.
  • the AMF network element When the AMF network element receives the first establishment request, it can immediately trigger the establishment of the first wireless connection, that is, step 503 is executed immediately; or it can trigger the first wireless connection when it is determined that the second wireless connection with the persistent online attribute is not established. Establishment of a wireless connection and a second wireless connection.
  • Step 503 the AMF network element triggers the establishment of the first wireless connection.
  • Step 504 the AMF network element triggers the establishment of the second wireless connection. It can be understood that the AMF network element triggers the restoration of the wireless connection corresponding to the second PDU session.
  • step 503 and step 504 may be performed simultaneously, or step 503 may be performed first and then step 504, or step 504 may be performed first and then step 503.
  • step 503 or step 504 may be performed simultaneously, or step 503 may be performed first and then step 504, or step 504 may be performed first and then step 503.
  • the SMF network element corresponding to the first wireless connection and the SMF network element corresponding to the second wireless connection may be the same or different, depending on the selection of the AMF network element.
  • the UPF network element corresponding to the first wireless connection and the UPF network element corresponding to the second wireless connection may be the same or different, depending on the selection of the SMF network element.
  • the AMF network element triggers the establishment of the second wireless connection when it is determined that the second wireless connection with the persistent online attribute is not established, without the UE sending a request for establishing the second wireless connection, This simplifies the process of establishing multiple wireless connections and reduces the delay.
  • FIG. 6 is a schematic flowchart of another method for establishing a wireless connection provided by the present application.
  • the first wireless connection is a wireless connection of a PDU session of a data service
  • the second wireless connection is a wireless connection of a PDU session of a voice service.
  • the process shown in FIG. 6 may include, but is not limited to, the following steps:
  • Step 601 the UE sends a first establishment request to the AMF network element.
  • the AMF network element receives the first establishment request from the UE.
  • Step 602 the AMF network element determines that the wireless connection of the PDU session of the voice service has not been established, and the wireless connection has a permanent online attribute.
  • Step 603 the AMF network element triggers the establishment of the wireless connection of the PDU session of the data service.
  • the UE may transmit the data service data or receive the data service data.
  • Step 604 the AMF network element triggers the establishment of the wireless connection of the PDU session of the voice service.
  • the UE may send IMS SIP data or receive IMS SIP data in the case where a wireless connection of a PDU session for voice services is established.
  • steps 602 to 604 reference may be made to the specific descriptions of steps 502 to 504 in FIG. 5 , which will not be repeated here.
  • the AMF network element determines that the wireless connection of the PDU session of the voice service has a permanent online attribute. During the process of the data service being in the connected state, the AMF network element can actively trigger the PDU session of the voice service. The establishment of the wireless connection, thereby reducing the call delay of the voice service.
  • FIG. 7 is a schematic flowchart of another method for establishing a wireless connection provided by the present application.
  • the process takes the wireless connection failure of the PDU session of the voice service as an example, and the wireless connection of the PDU session of the voice service has a permanent online attribute.
  • the flow shown in FIG. 7 may include, but is not limited to, the following steps:
  • Step 700 the SMF network element 1 corresponding to the PDU session of the voice service is faulty, or the SMF network element 1 is unreachable.
  • the SMF network element 1 may fail or the SMF network element 1 may be unreachable.
  • Step 701 the AMF network element detects that the SMF network element 1 is faulty.
  • the AMF network element When the data service is in the connected state, the AMF network element actively triggers the establishment of the wireless connection of the PDU session of the voice service. During the process of establishing the wireless connection, if the AMF network element cannot receive the message from the SMF network element 1 or the received message from the SMF network element 1 times out, it can be determined that the SMF network element 1 is faulty or the SMF network element 1 is unreachable.
  • Step 702 the AMF network element sends a re-registration notification to the UE.
  • the UE receives the re-registration notification from the AMF network element.
  • the re-registration notification is used to notify the UE to send a re-registration request.
  • the AMF network element may directly send a re-registration notification to the UE, or may send a re-registration notification to the UE through an access network device.
  • Step 703 the UE sends a re-registration request to the AMF network element.
  • the AMF network element receives the re-registration request from the UE.
  • the re-registration request is used for requesting to re-establish the wireless connection of the PDU session of the voice service.
  • the UE may directly send a re-registration request to the AMF network element, or may send a re-registration request to the AMF network element through an access network device.
  • Step 704 the AMF network element re-triggers the establishment of the wireless connection of the PDU session of the voice service.
  • the AMF network element When the AMF network element receives the re-registration request, it performs steps 2 to 11 in FIG. 2 to establish a wireless connection of the PDU session of the voice service.
  • the AMF network element when the AMF network element detects that the SMF network element 1 is faulty, it directly triggers the UE to send a re-registration request, so as to establish a wireless connection of the PDU session of the voice service and ensure the normal operation of the voice service. conduct.
  • the AMF network element detects whether the SMF network element 1 is faulty through the permanent online attribute.
  • the detection time can be reduced; when the AMF element detects that the SMF network element 1 is faulty, it directly Triggering the UE to send a re-registration request can reduce the user separation time compared to separating users one by one when a failure of the SMF network element 1 is detected; thus, the voice service can be quickly restored.
  • FIG. 8 is a schematic flowchart of another method for establishing a wireless connection provided by the present application.
  • the process takes the wireless connection failure of the PDU session of the voice service as an example, and the wireless connection of the PDU session of the voice service has a permanent online attribute.
  • the flow shown in FIG. 8 may include, but is not limited to, the following steps:
  • Step 800 the UPF network element 1 corresponding to the PDU session of the voice service is faulty, or the UPF network element 1 is unreachable.
  • the UPF network element 1 may fail or the UPF network element 1 may be unreachable.
  • Step 801 the SMF network element 1 detects that the UPF network element 1 is faulty.
  • the AMF network element When the data service is in the connected state, the AMF network element actively triggers the establishment of the wireless connection of the PDU session of the voice service. During the process of establishing the wireless connection, if SMF network element 1 cannot receive the message from UPF network element 1 or the received message from UPF network element 1 times out, it can be determined that UPF network element 1 is faulty or UPF network element 1 is unreachable .
  • the SMF network element 1 sends a wireless connection establishment failure message to the AMF network element.
  • the SMF network element 1 is the SMF network element corresponding to the PDU session of the voice service.
  • Step 802 the SMF network element 1 sends a re-registration notification to the AMF network element.
  • the AMF network element receives the re-registration notification from the SMF network element 1 .
  • Step 803 the AMF network element sends a re-registration notification to the UE.
  • the UE receives the re-registration notification from the AMF network element.
  • the re-registration notification is used to notify the UE to send a re-registration request.
  • the AMF network element may directly send a re-registration notification to the UE, or may send a re-registration notification to the UE through an access network device.
  • Step 804 the UE sends a re-registration request to the AMF network element.
  • the AMF network element receives the re-registration request from the UE.
  • the re-registration request is used for requesting to re-establish the wireless connection of the PDU session of the voice service.
  • the UE may directly send a re-registration request to the AMF network element, or may send a re-registration request to the AMF network element through an access network device.
  • Step 805 the AMF network element re-triggers the establishment of the wireless connection of the PDU session of the voice service.
  • the AMF network element When the AMF network element receives the re-registration request, it performs steps 2 to 11 in FIG. 2 to establish a wireless connection of the PDU session of the voice service.
  • the SMF network element 1 can quickly detect the failure of the UPF network element 1, and can also reduce the user separation time, so that the voice service can be quickly restored.
  • FIG. 7 shows that the AMF network element detects that the SMF network element 1 is faulty
  • FIG. 8 shows that the SMF network element 1 detects that the UPF network element 1 is faulty. Both Figures 7 and 8 can quickly restore voice services.
  • the faulty network element can be quickly detected through the permanent online attribute, and the The establishment of the second PDU session is quickly resumed.
  • the embodiments of the present application further provide corresponding apparatuses, including corresponding modules for executing the foregoing embodiments.
  • the modules may be software, hardware, or a combination of software and hardware.
  • FIG. 9 is a schematic structural diagram of a communication device.
  • the communication apparatus 900 may be an access management network element, or may be a chip, a chip system, or a processor that supports the access management network element to implement the above method.
  • the apparatus can be used to implement the methods described in the foregoing method embodiments, and for details, reference may be made to the descriptions in the foregoing method embodiments.
  • the communication apparatus 900 may include one or more processors 901, and the processors 901 may also be referred to as processing units or processing modules, etc., and may implement certain control functions.
  • the processor 901 may be a general-purpose processor or a special-purpose processor, or the like.
  • the general-purpose processor may be, for example, a central processing unit
  • the special-purpose processor may be, for example, a baseband processor.
  • the baseband processor can be used to process communication protocols and communication data
  • the central processing unit can be used to control communication devices (such as base stations, baseband chips, MT, DU, or CU, etc.), execute software programs, and process software programs. data.
  • the processor 901 may also store instructions 903, and the instructions 903 may be executed by the processor 901, so that the communication apparatus 900 executes the methods described in the above method embodiments.
  • the processor 901 may include a transceiver unit for implementing receiving and transmitting functions.
  • the transceiver unit may be a transceiver circuit, or an interface.
  • Transceiver circuits, interfaces or interface circuits used to implement receiving and transmitting functions may be separate or integrated.
  • the above-mentioned transceiver circuit or interface can be used for reading and writing instructions, or the above-mentioned transceiver circuit or interface can be used for signal transmission.
  • the communication apparatus 900 may include one or more memories 902 on which instructions 904 may be stored, and the instructions 904 may be executed on the processor 901, so that the communication apparatus 900 executes the methods described in the above method embodiments.
  • data may also be stored in the memory 902 .
  • instructions and/or data may also be stored in the processor 901 .
  • the processor 901 and the memory 902 can be provided separately or integrated together. For example, the corresponding relationship described in the above method embodiments may be stored in the memory 902 or in the processor 901 .
  • the communication device 900 may further include a transceiver 905 and/or an antenna 906 .
  • the transceiver 905 may be referred to as a transceiver unit, a transceiver, a transceiver circuit, a transceiver device, or a transceiver module, etc., and is used to implement a transceiver function.
  • the communication apparatus 900 when it is an access management network element, it may include various functional modules for executing steps 501 to 504 in FIG. 5 ; steps 601 to 604 in FIG. 6 . ; Steps 701 to 704 in FIG. 7 ; Steps 802 to 805 in FIG. 8 .
  • ICs may include analog ICs, radio frequency integrated circuits (RFICs), mixed-signal ICs, application specific integrated circuits (ASICs), and the like.
  • RFICs radio frequency integrated circuits
  • ASICs application specific integrated circuits
  • PCB printed circuit board
  • the communication apparatus described in the above embodiments may be network equipment or terminal equipment, but the scope of the apparatus described in this application is not limited thereto, and the structure of the communication apparatus may not be limited by FIG. 9 .
  • the communication means may be:
  • Receivers terminals, cellular phones, wireless equipment, handsets, mobile units, in-vehicle equipment, network equipment, cloud equipment, artificial intelligence equipment, machine equipment, home equipment, medical equipment, industrial equipment, etc.
  • the apparatus may be an access management network element, or may be a component (eg, an integrated circuit, a chip, etc.) of the access management network element.
  • the apparatus may also be other communication modules, which are used to implement the methods in the method embodiments of the present application.
  • the communication apparatus 1000 may include: a processing unit 1001 (or referred to as a processing module).
  • a communication unit 1002 (or referred to as a transceiver unit, a receiving unit and/or a sending unit) may also be included.
  • a storage unit (or referred to as a storage module) may also be included.
  • one or more units as in FIG. 10 may be implemented by one or more processors, or by one or more processors and memory; or by one or more processors and a transceiver; or implemented by one or more processors, a memory, and a transceiver, which is not limited in this embodiment of the present application.
  • the processor, memory, and transceiver can be set independently or integrated.
  • each module in the communication apparatus 1000 in the embodiment of the present application may be used to execute the method described by the AMF network element in FIG. 5 , FIG. 6 , FIG. 7 , or FIG. 8 in the embodiment of the present application, or may be used to execute the foregoing A method in which the methods described in two or more figures are combined with each other.
  • the processor in this embodiment of the present application may be an integrated circuit chip, which has signal processing capability.
  • each step of the above method embodiments may be completed by a hardware integrated logic circuit in a processor or an instruction in the form of software.
  • the above-mentioned processor may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other possible Programming logic devices, discrete gate or transistor logic devices, discrete hardware components.
  • a processing unit for performing the techniques at a communication device may be implemented in one or more general purpose processors, DSPs, digital signal processing devices, ASICs, A programmable logic device, FPGA, or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination of the above.
  • a general-purpose processor may be a microprocessor, or alternatively, the general-purpose processor may be any conventional processor, controller, microcontroller, or state machine.
  • a processor may also be implemented by a combination of computing devices, such as a digital signal processor and a microprocessor, multiple microprocessors, one or more microprocessors in combination with a digital signal processor core, or any other similar configuration. accomplish.
  • the memory in this embodiment of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically programmable Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory.
  • Volatile memory may be random access memory (RAM), which acts as an external cache.
  • RAM random access memory
  • DRAM dynamic random access memory
  • SDRAM synchronous DRAM
  • SDRAM double data rate synchronous dynamic random access memory
  • ESDRAM enhanced synchronous dynamic random access memory
  • SLDRAM synchronous link dynamic random access memory
  • direct ram bus RAM direct ram bus RAM
  • the corresponding relationships shown in each table in this application may be configured or predefined.
  • the values of the information in each table are only examples, and can be configured with other values, which are not limited in this application.
  • the corresponding relationships shown in some rows may not be configured.
  • appropriate deformation adjustments can be made based on the above table, for example, splitting, merging, and so on.
  • the names of the parameters shown in the headings in the above tables may also adopt other names that can be understood by the communication device, and the values or representations of the parameters may also be other values or representations that the communication device can understand.
  • other data structures can also be used, such as arrays, queues, containers, stacks, linear lists, pointers, linked lists, trees, graphs, structures, classes, heaps, hash tables, or hash tables. Wait.
  • Predefined in this application may be understood as defining, predefining, storing, pre-storing, pre-negotiating, pre-configuring, curing, or pre-firing.
  • the systems, devices and methods described in this application can also be implemented in other ways.
  • the apparatus embodiments described above are only illustrative.
  • the division of the units is only a logical function division. In actual implementation, there may be other division methods.
  • multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented.
  • the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.
  • the functions, if implemented in the form of software functional units and sold or used as independent products, may be stored in a computer-readable storage medium.
  • the technical solution of the present application can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution, and the computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application.
  • the aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk and other media that can store program codes .

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Abstract

本申请提供一种无线连接建立方法及通信装置，可应用于PDU会话的无线连接的建立过程。其中，该方法可包括：接入管理网元接收来自用户设备的第一建立请求，第一建立请求用于请求建立第一无线连接；确定未建立具有永久在线属性的第二无线连接；触发第一无线连接的建立，并触发第二无线连接的建立。采用本申请，可以精简多个无线连接的建立流程，从而减少时延。

Description

无线连接建立方法及通信装置
本申请要求于2020年11月23日提交中国专利局、申请号为202011325740.4、申请名称为“无线连接建立方法及通信装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信技术领域，尤其涉及一种无线连接建立方法及其装置。
背景技术
第五代(5 th-generation，5G)通信系统中的无线连接可以是协议数据单元(protocol data unit，PDU)会话(session)的无线连接。PDU会话指的是用户设备(user equipment，UE)与数据网络(data network，DN)之间进行通信的过程，PDU会话的无线连接指的是UE与DN之间的数据传输通道。对于接入层(access stratum，SA)而言，PDU会话的无线连接可以包括UE与接入网之间以及接入网与用户面功能(user plane function，UPF)网元之间的数据传输通道。
5G系统按需建立PDU会话的无线连接，例如UE按照业务需求，建立与业务相关的PDU会话的无线连接。这种按需建立PDU会话的无线连接的机制，可能会增加时延。例如，UE与DN之间已建立数据业务的PDU会话的无线连接，但在通过该无线连接进行数据业务的传输过程中，UE发起主叫语音业务，需要建立语音业务的PDU会话的无线连接，从而增加呼叫时延。
发明内容
本申请提供一种无线连接建立方法及通信装置，可以精简多个无线连接的建立流程，从而减少时延。
第一方面，本申请提供一种无线连接建立方法，该方法可以由接入管理网元执行，或者也可以由配置于接入管理网元的芯片执行，本申请对此不作限定。
具体的，该方法包括：接入管理网元接收来自用户设备的第一建立请求，第一建立请求用于请求建立第一无线连接；确定未建立具有永久在线属性的第二无线连接；触发第一无线连接的建立，并触发第二无线连接的建立。
可见，在用户设备发起或网络侧辅助发起第一无线连接的建立时，可触发具有永久在线属性的第二无线连接的建立，无需用户设备发起第二无线连接的建立，从而可以精简多个无线连接的建立流程，从而减少时延。
结合第一方面，在某些可能的实现方式中，第一无线连接为第一PDU会话的无线连接，第二无线连接为第二PDU会话的无线连接。在用户设备发起或网络侧辅助发起建立第一PDU会话的无线连接时，接入管理网元可自动建立第二PDU会话的无线连接，无需用户设备发起建立第二PDU会话的无线连接，从而减少第二PDU会话的无线连接的建立时长。
结合第一方面，在某些可能的实现方式中，第一无线连接为非PDU会话的无线连接，第二无线连接为PDU会话的无线连接。非PDU会话的无线连接，例如信令连接。在用户设备发起或网络侧辅助发起建立信令连接时，接入管理网元可自动建立具有永久在线属性的PDU会话的无线连接，无需用户设备发起建立PDU会话的无线连接，从而减少PDU会话的无线 连接的建立时长。
结合第一方面，在某些可能的实现方式中，接入管理网元接收会话建立请求，会话建立请求用于请求建立PDU会话，该PDU会话对应的标识与指定标识列表匹配的情况下，接入管理网元记录该PDU会话具有永久在线属性，进而该PDU会话对应的无线连接也具有永久在线属性，以便在用户设备发起第一无线连接时，可触发第二无线连接的建立。
结合第一方面，在某些可能的实现方式中，该PDU会话对应的标识为数据网络名称(data network name，DNN)，上述指定标识列表为指定DNN列表。可以理解的是，指定DNN列表所包括的DNN对应的无线连接具有永久在线属性。接入管理网元根据指定DNN列表判断无线连接是否具有永久在线属性，实现简便，准确性较高。
结合第一方面，在某些可能的实现方式中，该PDU会话对应的标识为PDU会话标识(PDU session identify，PSI)，上述指定标识列表为指定PSI列表。可以理解的是，在PSI与DNN之间的对应关系固定的情况下，指定PSI列表所包括的PSI对应的PDU会话的无线连接具有永久在线属性。接入管理网元根据指定PSI列表判断无线连接是否具有永久在线属性，实现简便。
结合第一方面，在某些可能的实现方式中，接入管理网元在检测到第二无线连接对应的第二会话管理网元存在故障的情况下，向用户设备发送重注册通知，重注册通知用于通知用户设备发送重注册请求；接收来自用户设备的重注册请求，重注册请求用于请求重新建立第二无线连接；根据重注册请求，重新触发第二无线连接的建立。
可见，接入管理网元在检测到第二会话管理网元存在故障的情况下，直接触发用户设备发送重注册请求，以重新建立第二PDU会话的无线连接，保证第二PDU会话的正常进行。
结合第一方面，在某些可能的实现方式中，接入管理网元在接收到来自会话管理网元的重注册通知的情况下，向用户设备发送重注册通知，重注册通知用于通知用户设备发送重注册请求；接收来自用户设备的重注册请求，重注册请求用于请求重新建立第二无线连接；根据重注册请求，重新触发第二无线连接的建立。
可见，会话管理网元在检测到用户面网元存在故障的情况下，向接入管理网元发送重注册通知，以触发用户设备发送重注册请求，从而重新建立第二PDU会话的无线连接，保证第二PDU会话的正常进行。
第二方面，本申请还提供一种通信装置。该通信装置具有实现上述第一方面所述的接入管理网元的部分或全部功能。比如，装置的功能可具备本申请中接入管理网元的部分或全部实施例中的功能，也可以具备单独实施本申请中的任一个实施例的功能。所述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。所述硬件或软件包括一个或多个与上述功能相对应的单元或模块。
在一种可能的设计中，该通信装置的结构中可包括处理单元和通信单元，所述处理单元被配置为支持通信装置执行上述方法中相应的功能。所述通信单元用于支持通信装置与其他设备之间的通信。所述通信装置还可以包括存储单元，所述存储单元用于与处理单元和通信单元耦合，其保存通信装置必要的程序指令和数据。
一种实施方式中，所述通信装置包括：
通信单元，用于接收来自用户设备的第一建立请求，第一建立请求用于请求建立第一无线连接；
处理单元，用于确定未建立具有永久在线属性的第二无线连接；触发第一无线连接的建立，并触发第二无线连接的建立。
该实施方式的相关内容可参见上述第一方面的相关内容，此处不再详述。
另一种实施方式中，所述通信装置可包括：
处理器，用于通过收发器接收来自用户设备的第一建立请求，第一建立请求用于请求建立第一无线连接；确定未建立具有永久在线属性的第二无线连接；触发第一无线连接的建立，并触发第二无线连接的建立。
该实施方式的相关内容可参见上述第一方面的相关内容，此处不再详述。
在实现过程中，处理器可用于进行，例如但不限于，基带相关处理，收发器可用于进行，例如但不限于，射频收发。上述器件可以分别设置在彼此独立的芯片上，也可以至少部分的或者全部的设置在同一块芯片上。例如，处理器可以进一步划分为模拟基带处理器和数字基带处理器。其中，模拟基带处理器可以与收发器集成在同一块芯片上，数字基带处理器可以设置在独立的芯片上。随着集成电路技术的不断发展，可以在同一块芯片上集成的器件越来越多。例如，数字基带处理器可以与多种应用处理器(例如但不限于图形处理器，多媒体处理器等)集成在同一块芯片之上。这样的芯片可以称为系统芯片(System on Chip)。将各个器件独立设置在不同的芯片上，还是整合设置在一个或者多个芯片上，往往取决于产品设计的需要。本申请实施例对上述器件的实现形式不做限定。
第三方面，本申请还提供一种处理器，用于执行上述各种方法。在执行这些方法的过程中，上述方法中有关发送上述信息和接收上述信息的过程，可以理解为由处理器输出上述信息的过程，以及处理器接收输入的上述信息的过程。在输出上述信息时，处理器将该上述信息输出给收发器，以便由收发器进行发射。该上述信息在由处理器输出之后，还可能需要进行其他的处理，然后才到达收发器。类似的，处理器接收输入的上述信息时，收发器接收该上述信息，并将其输入处理器。更进一步的，在收发器收到该上述信息之后，该上述信息可能需要进行其他的处理，然后才输入处理器。
基于上述原理，举例来说，前述方法中提及的发送建立请求可以理解为处理器输出建立请求。
对于处理器所涉及的发射、发送和接收等操作，如果没有特殊说明，或者，如果未与其在相关描述中的实际作用或者内在逻辑相抵触，则均可以更加一般性的理解为处理器输出和接收、输入等操作，而不是直接由射频电路和天线所进行的发射、发送和接收操作。
在实现过程中，上述处理器可以是专门用于执行这些方法的处理器，也可以是执行存储器中的计算机指令来执行这些方法的处理器，例如通用处理器。上述存储器可以为非瞬时性(non-transitory)存储器，例如只读存储器(Read Only Memory，ROM)，其可以与处理器集成在同一块芯片上，也可以分别设置在不同的芯片上，本申请实施例对存储器的类型以及存储器与处理器的设置方式不做限定。
第四方面，本申请提供了一种计算机可读存储介质，用于储存计算机软件指令，当所述指令被计算机执行时，实现上述第一方面所述的方法。
第五方面，本申请还提供了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第一方面所述的方法。
第六方面，本申请提供了一种芯片系统，该芯片系统包括至少一个处理器和通信接口，所述至少一个处理器用于执行计算机程序，所述通信接口用于输入和/或输出信息，使得接入管理网元实现第一方面所涉及的功能。
在一种可能的设计中，所述芯片系统还包括存储器，所述存储器，用于保存接入管理网元必要的程序指令和数据。该芯片系统，可以由芯片构成，也可以包括芯片和其他分立器件。
附图说明
图1为5G系统的网络架构示意图；
图2为建立一个PDU会话的无线连接的流程示意图；
图3为建立两个PDU会话的无线连接的流程示意图；
图4为应用本申请的网络架构示意图；
图5为本申请提供的一种无线连接建立方法的流程示意图；
图6为本申请提供的另一种无线连接建立方法的流程示意图；
图7为本申请提供的又一种无线连接建立方法的流程示意图；
图8为本申请提供的又一种无线连接建立方法的流程示意图；
图9为本申请提供的通信装置的结构示意图；
图10为本申请提供的通信装置的另一种结构示意图。
具体实施方式
为了更好地理解本申请实施例提供的技术方案，首先对本申请实施例涉及的技术术语进行介绍。
1、5G系统的网络架构
请参见图1，为5G系统的网络架构示意图，该网络架构包括UE、接入网(access network，AN)设备、核心网网元和DN。
其中，接入网设备也可以是无线接入网(radio access network，RAN)设备。接入网设备可以包括基站(base station，BS)，可以是一种部署在无线接入网络中能够和终端设备进行无线通信的设备。其中，基站可能有多种形式，比如宏基站、微基站、中继站和接入点等。示例性地，本申请实施例涉及到的接入网设备可以是5G中的基站或长期演进(long term evolution，LTE)中的基站，其中，5G中的基站还可以称为发送接收点(transmission reception point，TRP)或下一代基站节点(next generation Node B，gNB)。
其中，核心网网元可以包括这些网元：用户面功能(user plane function，UPF)、接入和移动性管理功能(access and mobility management function，AMF)、会话管理功能(session management function，SMF)、策略控制功能(policy control function，PCF)、应用功能(application，AF)、鉴权服务器功能(authentication server function，AUSF)、网络切片选择功能(network slice selection function，NSSF)和统一数据管理(unified data management，UDM)和应用功能(application，AF)。
AMF网元，非接入层(non-access stratum，NAS)信令的终结点，主要负责用户的接入和移动性管理。UE与AMF可以通过N1NAS消息进行通信，也可以通过RAN的N2消息进行中转。RAN与AMF通过N2消息进行通信。
SMF网元，负责管理用户PDU会话的创建、删除等，维护PDU会话上下文及用户面转发管道信息。
NSSF网元，用于支持基于用户请求的和签约的网络切片选择辅助信息(network slice selection assistance information，NSSAI)、用户位置区域、切片容量、切片当前负荷等信息，进行切片的灵活选择。
PCF网元，用于生成、管理用户、会话、服务质量(quality of service，QoS)流处理策略。
UDM网元，用于管理用户的签约信息，完成用户认证与授权。
AF网元，提供应用服务，可以位于运营商网络内，也可以位于运营商网络外。
图1所示的网络架构示意图中，还包括各个网元之间的接口，例如N2表示AMF网元与RAN设备之间的接口。
2、PDU会话和PDU会话的无线连接
PDU会话，UE与DN之间进行通信的过程；PDU会话的无线连接，UE与DN之间的数据传输通道。可以理解的是，建立了PDU会话即建立了PDU的无线连接。对SA而言，PDU会话的无线连接可以包括UE与AN之间以及AN与UPF网元之间的数据传输通道。
示例性的，建立一个PDU会话的无线连接的流程可参见图2所示，图2所示的流程可以包括但不限于如下步骤：
步骤1，UE向AMF网元发送PDU会话建立请求。相应的，AMF网元接收来自UE的PDU会话建立请求。
UE通过向AMF网元发送PDU会话建立请求，发起PDU会话建立流程。PDU会话建立请求可以包括PDU会话标识(PDU session identify，PSI)。PDU会话建立请求可以是PDU Session Establishment Request。
UE可通过非接入层(non-access stratum，NAS)消息向AMF网元发送PDU会话建立请求，即UE向R(AN)发送PDU会话建立请求，R(AN)向AMF网元发送PDU会话建立请求。或，UE直接通过AS消息向AMF网元PDU会话建立请求。
步骤2，AMF网元选择SMF网元。
步骤3，AMF网元向SMF网元发送PDU会话上下文信息建立请求。相应的，SMF网元接收来自AMF网元的PDU会话上下文信息建立请求。
PDU会话上下文信息建立请求用于请求SMF网元建立PDU会话的上下文信息，可以是Nsmf_PDUSession_CreateSMContext Request。
步骤4，SMF网元从UDM网元获取订阅信息或更新订阅信息。
步骤5，SMF网元向AMF网元发送PDU会话上下文信息建立响应。相应的，AMF网元接收来自SMF网元的PDU会话上下文信息建立响应。
其中，PDU会话上下文信息建立响应用于响应PDU会话上下文信息建立请求，可以是Nsmf_PDUSession_CreateSMContext Response。
步骤6，SMF网元选择UPF网元。
步骤7，SMF网元与UPF网元创建N4会话。
步骤8，SMF网元向AMF网元发送N1N2转移消息。相应的，AMF网元接收来自SMF网元的N1N2转移消息。
其中，N1N2转移消息可以是Namf_Communication_N1N2MessageTransfer。
步骤9，AMF网元向R(AN)发送N2 PDU会话请求。相应的，R(AN)接收来自AMF网元的N2 PDU会话请求。
其中，N2 PDU会话请求可以是N2 PDU Session Request。N2 PDU会话请求为非接入层NAS消息。
步骤10，R(AN)与UE执行特殊资源建立。
在这个过程中，R(AN)向UE发送PDU会话建立接受，用于响应步骤1的PDU会话建立请求。PDU会话建立接受可以是PDU Session Establishment Accept。
步骤11，R(AN)向AMF网元发送N2 PDU会话响应。相应的，AMF网元接收来自R(AN)的N2 PDU会话响应。
其中，N2 PDU会话响应可以是N2 PDU Session Response。
5G系统中，UE的数据业务频繁，在数据业务处于连接态的过程中，UE发起主叫语音业务，需要建立语音业务的PDU会话的无线连接，该过程可参见图3所示，图3所示的流程可以包括但不限于如下步骤：
步骤301，UE向AMF网元发送第一PDU会话建立请求。相应的，AMF网元接收来自UE的第一PDU会话建立请求。
其中，第一PDU会话建立请求可携带上行数据状态(uplink data status)为PSI＝1，用于指示请求建立数据业务的PDU会话的无线连接。
步骤302，AMF网元向SMF网元发送PDU会话上下文信息更新请求。相应的，SMF网元接收来自AMF网元的PDU会话上下文信息更新请求。
其中，PDU会话上下文信息更新请求用于请求SMF网元更新PDU会话的上下文信息，可以是Nsmf_PDUSession_UpdateSMContext Request。PDU会话上下文信息更新请求可携带PSI＝1，用于指示数据业务的PDU会话。
步骤302与步骤3的不同之处在于，图2请求建立之前未建立过的PDU会话，因此步骤3为PDU会话上下文信息建立请求，而图3请求建立之前建立过的数据业务的PDU会话，因此步骤302为PDU会话上下文信息更新请求。
步骤303，建立第一PDU会话的无线连接。步骤303可参考图2中步骤4-步骤11的过程，在此不再赘述。
其中，第一PDU会话即数据业务的PDU会话。
步骤304，UE发送数据业务数据。UE通过第一PDU会话的无线连接，向数据业务对应的DN发送数据业务数据。
步骤305，UE向AMF网元发送第二PDU会话建立请求。相应的，AMF网元接收来自UE的第二PDU会话建立请求。
其中，第二PDU会话建立请求可携带uplink data status为PSI＝2，用于指示请求建立语音业务的PDU会话的无线连接。
步骤306，AMF网元向SMF网元发送PDU会话上下文信息更新请求。相应的，SMF网元接收来自AMF网元的PDU会话上下文信息更新请求。
步骤306中的PDU会话上下文信息更新请求可携带PSI＝2，用于指示语音业务的PDU会话。
步骤307，建立第二PDU会话的无线连接。步骤307可参考图2中步骤4-步骤11的过程，在此不再赘述。
其中，第二PDU会话即语音业务的PDU会话。
步骤308，UE发送IP多媒体子系统(IP multimedia subsystem，IMS)会话初始协议(session initiation protocol，SIP)信令数据。UE通过第二PDU会话的无线连接，向语音业务对应的DN发送IMS SIP业务数据。
图3中，步骤304为UE发起语音业务，若UE被呼叫，则UE在接收到来自AMF的网元的呼叫请求时，执行步骤304。
3、具有永久在线(always-on)属性的PDU会话
在第三代合作伙伴计划(3 rd-generation partnership project，3GPP)23.501中引入具有always-on属性的PDU会话，其定义为：每次从空闲态转换至连接态的过程中，具有always-on属性的PDU会话需要获取用户面资源。
在建立第一PDU会话的无线连接的过程中，UE向AMF网元发送的第一PDU会话建立请求中可指示请求建立具有always-on属性的第一PDU会话，核心网网元(例如SMF网元)在第一PDU会话的上下文信息中记录第一PDU会话具有always-on属性。之后，在建立第二PDU会话的无线连接的过程中，AMF网元除了触发第二PDU会话的无线连接的建立，还触发第一PDU会话的无线连接的建立。或，在建立非PDU会话的无线连接的过程中，AMF网元除了触发非PDU会话的无线连接的建立，还触发第一PDU会话的无线连接的建立。该种实现方式，依赖UE能够指示请求建立具有always-on属性的PDU会话。
由图3可知，在数据业务处于连接态的过程中，UE通过发起语音业务的PDU会话的无线连接，以实现数据业务和语音业务的同时进行，但是以增加语音业务的呼叫时延为代价。AMF网元触发具有always-on属性的PDU会话的建立，依赖UE能够指示请求建立具有always-on属性的PDU会话。
鉴于此，本申请提供一种无线连接建立方法及其装置，可以精简多个无线连接的建立流程，从而减少时延。例如，在数据业务处于连接态时，AMF网元可以自动触发语音业务的PDU会话的无线连接的建立，无需UE发起语音业务的PDU会话的建立，也无需UE能够指示语音业务的PDU会话具有always-on属性。
下面将结合本申请中的附图，对本申请中的技术方案进行描述。其中，在本申请的描述中，除非另有说明，“/”表示前后关联的对象是一种“或”的关系，例如，A/B可以表示A或B。并且，在本申请的描述中，除非另有说明，“多个”是指两个或多于两个。“以下一项(个)或多项(个)”或其类似表达，是指的这些项中的任意组合，包括单项(个)或复数项(个)的任意组合。例如，a，b，或c中的一项或多项，可以表示：a，b，c，a和b，a和c，b和c，或a和b和c，其中a，b，c可以是单个，也可以是多个。另外，为了便于清楚描述本申请的技术方案，在本申请的实施例中，采用了“第一”、“第二”等字样对功能基本相同或相似的技术特征进行区分。本领域技术人员可以理解“第一”、“第二”等字样并不对数量和执行次序进行限定，并且“第一”、“第二”等字样也并不限定一定不同。
本申请描述的技术可用于各种通信系统，例如第四代(4th generation，4G)通信系统，4.5G通信系统，5G通信系统，多种通信系统融合的系统，或者未来演进的通信系统。例如长期演进(long term evolution，LTE)系统，新空口(new radio,NR)系统，无线保真(wireless-fidelity，WiFi)系统，以及第三代合作伙伴计划(3rd generation partnership project，3GPP)相关的通信系统等，以及其他此类通信系统。
本申请涉及的UE(也可称为终端)可以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)。UE包括具有无线通信功能的手持式设备、车载设备、穿戴式设备或计算设备。示例性地，UE可以是手机(mobile phone)、平板电脑或带无线收发功能的电脑。终端设备还可以是虚拟现实(virtual reality，VR)终端设备、增强现实(augmented reality，AR)终端设备、智能汽车(smart vehicle)终端设备、工业控制中的无线终端、无人驾驶中的无线终端、远程医疗中的无线终端、智能电网中的无线终端、智慧城市(smart city)中的无线终端、智慧家庭(smart home)中的无线终端、等等。
作为示例而非限定，在本申请中，UE可以是可穿戴设备。可穿戴设备也可以称为穿戴式智能设备，是应用穿戴式技术对日常穿戴进行智能化设计、开发出可以穿戴的设备的总称，如眼镜、手套、手表、服饰及鞋等。可穿戴设备即直接穿在身上，或是整合到用户的衣服或配件的一种便携式设备。可穿戴设备不仅仅是一种硬件设备，更是通过软件支持以及数据交 互、云端交互来实现强大的功能。广义穿戴式智能设备包括功能全、尺寸大、可不依赖智能手机实现完整或者部分的功能，例如：智能手表或智能眼镜等，以及只专注于某一类应用功能，需要和其它设备如智能手机配合使用，如各类进行体征监测的智能手环、智能首饰等。
在本申请中，UE可以是物联网(internet of things，IoT)系统中的终端，IoT是未来信息技术发展的重要组成部分，其主要技术特点是将物品通过通信技术与网络连接，从而实现人机互连，物物互连的智能化网络。本申请中的终端可以是机器类型通信(machine type communication，MTC)中的终端。本申请的终端可以是作为一个或多个部件或者单元而内置于车辆的车载模块、车载模组、车载部件、车载芯片或者车载单元，车辆通过内置的所述车载模块、车载模组、车载部件、车载芯片或者车载单元可以实施本申请的方法。因此，本申请可以应用于车联网，例如车辆外联(vehicle to everything，V2X)、车间通信长期演进技术(long term evolution vehicle，LTE-V)、车到车(vehicle to vehicle，V2V)等。
请参见图4，为应用本申请的网络架构示意图。图4所示的网络架构包括接入管理网元401和UE 402。接入管理网元401可以是图1中的AMF网元，也可以是未来通信系统中与AMF网元具有相同功能的网元。
应用在本申请中，接入管理网元401接收来自UE 402的第一建立请求，第一建立请求用于请求建立第一无线连接，响应第一建立请求，触发第一无线连接的建立；接入管理网元401确定未建立具有永久在线属性的第二无线连接，触发第二无线连接的建立。第二无线连接可与第一无线连接同时建立，或第二无线连接在第一无线连接建立的过程中建立，或第二无线连接在第一无线连接建立完成时建立。
其中，第一无线连接和第二无线连接可以均为PDU会话的无线连接，但为不同类型PDU会话的无线连接。第一无线连接可以是非PDU会话的无线连接，第二无线连接可以是PDU会话的无线连接。第二无线连接的数量不限定为一个，具体数量视情况而定。
可见，第二无线连接的建立并不是由UE 402发送的针对第二无线连接的建立请求触发的，从而可以精简多个无线连接的建立流程。无需UE 402指示第二无线连接具有永久在线属性，从而实现UE 402的解耦，适用范围更广。
可选的，图4所示的网络架构还包括接入网设备403，接入网设备403可以是5G系统中的gNB。接入网设备403位于UE 402与接入管理网元401之间。应用在本申请中，接入网设备403用于转发UE 402向接入管理网元401发送的消息，或接入管理网元401向UE 402转发的消息。
可选的，图4所示的网络架构还包括会话管理网元404，会话管理网元404可以是图1中的SMF网元，也可以是未来通信系统中与SMF网元具有相同功能的网元。应用在本申请中，接入管理网元401在检测出第二无线连接对应的会话管理网元404存在故障，或该会话管理网元404不可达的情况下，通知UE 402发送重注册请求；接入管理网元401在接收到该重注册请求时，重新触发第二无线连接的建立，以便第二无线连接对应的业务能够快速恢复。
可选的，图4所示的网络架构还包括用户面网元405，用户面网元405可以是图1中的UPF网元，也可以是未来通信系统中与UPF网元具有相同功能的网元。应用在本申请中，会话管理网元404在检测出第二无线连接对应的用户面网元405存在故障，或用户面网元405不可达的情况下，通过接入管理网元401通知UE 402发送重注册请求；接入管理网元401在接收到该重注册请求时，重新触发第二无线连接的建立，以便第二无线连接对应的业务能够快速恢复。
本申请描述的网络架构以及业务场景是为了更加清楚的说明本申请的技术方案，并不构 成对于本申请提供的技术方案的限定，本领域普通技术人员可知，随着网络架构的演变和新业务场景的出现，本申请提供的技术方案对于类似的技术问题，同样适用。
下面将对本申请提供的无线连接建立方法进行介绍。接入管理网元以AMF网元为例。需要说明的是，网元之间或网元与设备之间交互的信息或数据的名称用于举例，并不构成对本申请的限定。
在本申请实施例中的附图中，各个实施例所示的步骤，以及步骤之间的先后顺序用于举例，并不构成对本申请实施例的限定。应理解，执行图示中的部分步骤或调整步骤的顺序进行具体实施，均落在本申请的保护范围内。
请参见图5，为本申请提供的一种无线连接建立方法的流程示意图，该流程可以包括但不限于如下步骤：
步骤500a，AMF网元确定指定标识列表。
其中，指定标识列表用于确定无线连接是否具有永久在线属性。指定标识列表可以预配置在AMF网元上，或由AMF网元的管理员自行设置。
在一种实现方式中，指定标识列表为指定数据网络名称(data network name，DNN)列表，该指定DNN列表可以包括一个或多个具有永久在线属性的DNN。例如，该指定DNN列表包括语音业务对应的DNN。某个DNN具有永久在线属性，进而其对应的PDU会话具有永久在线属性，PDU会话对应的无线连接也具有永久在线属性。
在另一种实现方式中，在PSI与DNN之间的对应关系固定的情况下，指定标识列表可以是指定PSI列表，该指定PSI列表可以包括一个或多个具有永久在线属性的PDU会话的PSI。例如，该指定PSI列表包括语音业务的PDU会话对应的PSI。某个PSI具有永久在线属性，进而其标识的PDU会话的无线连接具有永久在线属性。
上述两种实现方式，用于举例，并不构成对本申请的限定，实际应用中，指定标识列表还可以是UPF网元与DNN之间的隧道标识列表、其他用于标识DN的信息列表等。
步骤500b，UE向AMF网元发送会话建立请求。相应的，AMF网元接收来自UE的会话建立请求。
其中，会话建立请求用于请求建立PDU会话。进一步的，在建立PDU会话的过程中，可建立PDU会话的无线连接。会话建立请求可携带PDU会话的PSI，以表明PDU会话的类型。
可以理解的是，UE在开机时，或首次启动时，向AMF网元发送会话建立请求，以建立PDU会话。后续对具有永久在线属性的PDU会话而言，可以不断地建立或释放PDU会话的无线连接。例如，对数据业务的PDU会话(具有永久在线属性)而言，可通过打开网页建立PDU会话的无线连接，可通过关闭网页释放PDU会话的无线连接；再例如，对语音业务的PDU会话(具有永久在线属性)而言，可通过拨打电话或接通电话建立PDU会话的无线连接，可通过挂断电话释放PDU会话的无线连接。
UE可直接向AMF网元发送会话建立请求，也可通过接入网设备向AMF网元发送会话建立请求。
步骤500c，在PDU会话对应的标识与指定标识列表匹配，AMF网元记录PDU会话具有永久在线属性。
AMF网元在建立PDU会话的过程中，将该PDU会话对应的标识与指定标识列表进行匹配，以识别出该PDU会话是否具有永久在线属性，并在识别出该PDU会话具有永久在线属性的情况下，记录该PDU会话具有永久在线属性。进一步的，AMF网元可记录该PDU会话 对应的无线连接具有永久在线属性。
在一种实现方式中，指定标识列表为指定DNN列表，该PDU会话对应的第二标识即为该PDU会话对应的DNN(一个PDU会话对应一个DNN)。AMF网元判断该DNN是否在指定DNN列表中，若在则该DNN与指定DNN列表匹配，该PDU会话具有永久在线属性，该PDU会话对应的无线连接具有永久在线属性；若不在则该DNN与指定DNN列表不匹配，该PDU会话不具有永久在线属性，该PDU会话对应的无线连接不具有永久在线属性。
在PDU会话具有永久在线属性的情况下，可按照步骤501至步骤504执行，在建立第一无线连接时，建立该PDU会话的无线连接，从而精简多个无线连接的建立流程，减少时延。在PDU会话不具有永久在线属性的情况下，按照图3所示的流程，建立PDU会话以及PDU会话的无线连接。
可以理解的是，步骤500a至步骤500b是执行步骤501至步骤504的前提条件，步骤501至步骤504为在UE请求建立第一无线连接的情况下，建立第一无线连接和第二无线连接。AMF网元设置指定DNN列表或指定PSI列表，无需UE在第二建立请求中指示第二无线连接具有永久在线属性，适用范围更广。
步骤501，UE向AMF网元发送第一建立请求。相应的，AMF网元接收来自UE的第一建立请求。
其中，第一建立请求用于请求建立第一无线连接，第一无线连接可以是第一PDU会话的无线连接，也可以是非PDU会话的无线连接，例如信令连接或无线资源控制(radio resource control，RRC)连接。
在第一无线连接为第一PDU会话的无线连接的情况下，第一建立请求可携带第一PDU会话的PSI，以表明第一PDU会话的类型。UE可以在开机或首次启动时，向AMF网元发送第一建立请求，第一建立请求用于请求建立第一PDU会话以及第一PDU会话的无线连接。或，UE可以在执行第一PDU会话的相关操作(例如打开网页或拨打电话等)时，向AMF网元发送第一建立请求，第一建立请求用于请求建立第一PDU会话的无线连接。
UE可直接向AMF网元发送第一建立请求，也可通过接入网设备向AMF网元发送第一建立请求。
步骤502，AMF网元确定未建立具有永久在线属性的第二无线连接。
在一种实现方式中，步骤500b中，AMF网元识别并记录PDU会话的无线连接具有永久在线属性，那么AMF网元可根据其记录信息以及当前已建立的无线连接，确定未建立具有永久在线属性的第二无线连接。
例如，当前已建立的无线连接对应的DNN包括DNN 1至DNN 3，其记录信息指示DNN 1至DNN 5具有永久在线属性，那么AMF网元可确定未建立DNN 4和DNN 5对应的无线连接，且这两个无线连接具有永久在线属性。那么第二无线连接包括DNN 4对应的无线连接，以及DNN5对应的无线连接。
在另一种实现方式中，不考虑步骤500b，AMF网元根据当前已建立的无线连接以及指定DNN列表或指定PSI列表，确定未建立具有永久在线属性的第二无线连接。
例如，当前已建立的无线连接对应的DNN包括DNN 1至DNN 3，指定DNN列表包括DNN 1至DNN 5，那么AMF网元可确定未建立DNN 4和DNN 5对应的无线连接，且这两个无线连接具有永久在线属性。那么第二无线连接包括DNN 4对应的无线连接，以及DNN5对应的无线连接。
AMF网元在接收到第一建立请求的情况下，可以立即触发第一无线连接的建立，即立即 执行步骤503；也可以在确定未建立具有永久在线属性的第二无线连接时，触发第一无线连接和第二无线连接的建立。
步骤503，AMF网元触发第一无线连接的建立。
步骤504，AMF网元触发第二无线连接的建立。可以理解的是，AMF网元触发第二PDU会话对应的无线连接的恢复。
需要说明的是，步骤503和步骤504可同时执行，也可以先执行步骤503再执行步骤504，或先执行步骤504再执行步骤503。步骤503或步骤504的具体实现过程可参见图2中步骤2至步骤11的描述，在此不再赘述。
第一无线连接对应的SMF网元与第二无线连接对应的SMF网元可以相同，也可以不相同，视AMF网元的选择而定。第一无线连接对应的UPF网元与第二无线连接对应的UPF网元可以相同，也可以不相同，视SMF网元的选择而定。
在图5所示的实施例中，AMF网元在确定未建立具有永久在线属性的第二无线连接的情况下，触发第二无线连接的建立，无需UE发送针对第二无线连接的建立请求，从而精简多个无线连接的建立流程，减少时延。
请参见图6，为本申请提供的另一种无线连接建立方法的流程示意图，该流程中第一无线连接以数据业务的PDU会话的无线连接，第二无线连接以语音业务的PDU会话的无线连接为例。图6所示的流程可以包括但不限于如下步骤：
步骤601，UE向AMF网元发送第一建立请求。相应的，AMF网元接收来自UE的第一建立请求。
其中，第一建立请求用于请求建立数据业务的PDU会话的无线连接，可携带PSI＝1。
步骤602，AMF网元确定未建立语音业务的PDU会话的无线连接，该无线连接具有永久在线属性。
步骤603，AMF网元触发数据业务的PDU会话的无线连接的建立。
在建立了数据业务的PDU会话的无线连接的情况下，UE可以发送数据业务数据或接收数据业务数据。
步骤604，AMF网元触发语音业务的PDU会话的无线连接的建立。
在建立了语音业务的PDU会话的无线连接的情况下，UE可以发送IMS SIP数据或接收IMS SIP数据。
步骤602至步骤604可参考图5中步骤502至步骤504的具体描述，在此不再赘述。
在图6所示的实施例中，AMF网元将语音业务的PDU会话的无线连接确定为具有永久在线属性，在数据业务处于连接态的过程中，AMF网元可以主动触发语音业务的PDU会话的无线连接的建立，从而减少语音业务的呼叫时延。
请参见图7，为本申请提供的又一种无线连接建立方法的流程示意图，该流程以语音业务的PDU会话的无线连接失败为例，语音业务的PDU会话的无线连接具有永久在线属性。图7所示的流程可以包括但不限于如下步骤：
步骤700，语音业务的PDU会话对应的SMF网元1存在故障，或SMF网元1不可达。
DN呼叫UE时，SMF网元1可能发生故障或SMF网元1不可达。
步骤701，AMF网元检测到SMF网元1存在故障。
在数据业务处于连接态的过程中，AMF网元主动触发语音业务的PDU会话的无线连接的建立。在建立该无线连接的过程中，AMF网元无法接收到来自SMF网元1的消息或接收的来自SMF网元1的消息超时，可确定SMF网元1存在故障或SMF网元1不可达。
步骤702，AMF网元向UE发送重注册通知。相应的，UE接收来自AMF网元的重注册通知。
其中，重注册通知用于通知UE发送重注册请求。
AMF网元可直接向UE发送重注册通知，也可以通过接入网设备向UE发送重注册通知。
步骤703，UE向AMF网元发送重注册请求。相应的，AMF网元接收来自UE的重注册请求。
其中，重注册请求用于请求重新建立语音业务的PDU会话的无线连接。
UE可直接向AMF网元发送重注册请求，也可以通过接入网设备向AMF网元发送重注册请求。
步骤704，AMF网元重新触发语音业务的PDU会话的无线连接的建立。
AMF网元在接收到重注册请求时，执行图2中的步骤2至步骤11，以建立语音业务的PDU会话的无线连接。
在图7所示的实施例中，AMF网元在检测到SMF网元1存在故障的情况下，直接触发UE发送重注册请求，以建立语音业务的PDU会话的无线连接，保证语音业务的正常进行。AMF网元通过永久在线属性检测SMF网元1是否存在故障，相比AMF网元通过图2所示流程检测，可减少检测时间；AMF元在检测到SMF网元1存在故障的情况下，直接触发UE发送重注册请求，相比在检测到SMF网元1存在故障时，逐个分离用户，可减少用户分离时间；从而可以快速恢复语音业务。
请参见图8，为本申请提供的又一种无线连接建立方法的流程示意图，该流程以语音业务的PDU会话的无线连接失败为例，语音业务的PDU会话的无线连接具有永久在线属性。图8所示的流程可以包括但不限于如下步骤：
步骤800，语音业务的PDU会话对应的UPF网元1存在故障，或UPF网元1不可达。
DN呼叫UE时，UPF网元1可能发生故障或UPF网元1不可达。
步骤801，SMF网元1检测到UPF网元1存在故障。
在数据业务处于连接态的过程中，AMF网元主动触发语音业务的PDU会话的无线连接的建立。在建立该无线连接的过程中，SMF网元1无法接收到来自UPF网元1的消息或接收的来自UPF网元1的消息超时，可确定UPF网元1存在故障或UPF网元1不可达。
可选的，SMF网元1向AMF网元发送无线连接建立失败消息。
其中，SMF网元1为语音业务的PDU会话对应的SMF网元。
步骤802，SMF网元1向AMF网元发送重注册通知。相应的，AMF网元接收来自SMF网元1的重注册通知。
步骤803，AMF网元向UE发送重注册通知。相应的，UE接收来自AMF网元的重注册通知。
其中，重注册通知用于通知UE发送重注册请求。
AMF网元可直接向UE发送重注册通知，也可以通过接入网设备向UE发送重注册通知。
步骤804，UE向AMF网元发送重注册请求。相应的，AMF网元接收来自UE的重注册请求。
其中，重注册请求用于请求重新建立语音业务的PDU会话的无线连接。
UE可直接向AMF网元发送重注册请求，也可以通过接入网设备向AMF网元发送重注册请求。
步骤805，AMF网元重新触发语音业务的PDU会话的无线连接的建立。
AMF网元在接收到重注册请求时，执行图2中的步骤2至步骤11，以建立语音业务的PDU会话的无线连接。
在图8所示的实施例中，SMF网元1可快速检测出UPF网元1存在故障，也可减少用户分离时间，从而可以快速恢复语音业务。
图8与图7的不同之处在于，图7为AMF网元检测出SMF网元1存在故障，而图8为SMF网元1检测出UPF网元1存在故障。图7和图8均能快速恢复语音业务。
进一步的，在通过第一PDU会话的无线连接进行通信的过程中，若第二PDU会话对应的SMF网元或UPF网元存在故障，通过永久在线属性可快速检测出存在故障的网元，并快速恢复第二PDU会话的建立。
相应于上述方法实施例给出的方法，本申请实施例还提供了相应的装置，包括用于执行上述实施例相应的模块。所述模块可以是软件，也可以是硬件，或者是软件和硬件结合。
图9给出了一种通信装置的结构示意图。通信装置900可以是接入管理网元，也可以是支持接入管理网元实现上述方法的芯片、芯片系统、或处理器等。该装置可用于实现上述方法实施例中描述的方法，具体可以参见上述方法实施例中的说明。
通信装置900可以包括一个或多个处理器901，处理器901也可以称为处理单元或处理模块等，可以实现一定的控制功能。处理器901可以是通用处理器或者专用处理器等。通用处理器例如可以是中央处理器，专用处理器例如可以是基带处理器。基带处理器可以用于对通信协议以及通信数据进行处理，中央处理器可以用于对通信装置(如，基站、基带芯片，MT、DU或CU等)进行控制，执行软件程序，处理软件程序的数据。
在一种可选的设计中，处理器901也可以存有指令903，所述指令903可以被处理器901运行，使得通信装置900执行上述方法实施例中描述的方法。
在另一种可选的设计中，处理器901中可以包括用于实现接收和发送功能的收发单元。例如该收发单元可以是收发电路，或者是接口。用于实现接收和发送功能的收发电路、接口或接口电路可以是分开的，也可以集成在一起。上述收发电路或接口可以用于指令的读写，或者，上述收发电路或接口可以用于信号的传输。
可选的，通信装置900中可以包括一个或多个存储器902，其上可以存有指令904，指令904可在处理器901上被运行，使得通信装置900执行上述方法实施例中描述的方法。可选的，存储器902中还可以存储有数据。可选的，处理器901中也可以存储指令和/或数据。处理器901和存储器902可以单独设置，也可以集成在一起。例如，上述方法实施例中所描述的对应关系可以存储在存储器902中，或者存储在处理器901中。
可选的，通信装置900还可以包括收发器905和/或天线906。收发器905可以称为收发单元、收发机、收发电路、收发装置或收发模块等，用于实现收发功能。
可选的，本申请实施例中，通信装置900为接入管理网元时，可以包含各种功能模块，用于执行图5中的步骤501至步骤504；图6中的步骤601至步骤604；图7中的步骤701至步骤704；图8中的步骤802至步骤805。
本申请中描述的处理器和收发器可实现在集成电路(integrated circuit，IC)上。IC可以包括模拟IC、射频集成电路RFIC、混合信号IC、专用集成电路(application specific integrated circuit，ASIC)等。印刷电路板(printed circuit board，PCB)上印刷电路可以实现IC。
以上实施例描述中的通信装置可以是网络设备或者终端设备，但本申请中描述的装置的范围并不限于此，而且通信装置的结构可以不受图9的限制。通信装置可以是：
(1)独立的集成电路IC，或芯片，或，芯片系统或其子系统；
(2)接收机、终端、蜂窝电话、无线设备、手持机、移动单元、车载设备、网络设备、云设备、人工智能设备、机器设备、家居设备、医疗设备、工业设备等等。
如图10所示，本申请又一实施例提供了一种通信装置1000。该装置可以是接入管理网元，也可以是接入管理网元的部件(例如，集成电路，芯片等等)。该装置也可以是其他通信模块，用于实现本申请方法实施例中的方法。该通信装置1000可以包括：处理单元1001(或称为处理模块)。可选的，还可以包括通信单元1002(或称为收发单元，接收单元和/或发送单元)。可选的，还可以包括存储单元(或称为存储模块)。
在一种可能的设计中，如图10中的一个或者多个单元可能由一个或者多个处理器来实现，或者由一个或者多个处理器和存储器来实现；或者由一个或多个处理器和收发器实现；或者由一个或者多个处理器、存储器和收发器实现，本申请实施例对此不作限定。所述处理器、存储器、收发器可以单独设置，也可以集成。
可选的，本申请实施例中的通信装置1000中各个模块可以用于执行本申请实施例中图5、图6、图7或图8中AMF网元描述的方法，也可以用于执行上述两个图或更多个图中描述的方法相互结合的方法。
可以理解的是，本申请实施例中的一些可选的特征，在某些场景下，可以不依赖于其他特征，比如其当前所基于的方案，而独立实施，解决相应的技术问题，达到相应的效果，也可以在某些场景下，依据需求与其他特征进行结合。相应的，本申请实施例中给出的装置也可以相应的实现这些特征或功能，在此不予赘述。
本领域技术人员还可以理解到本申请实施例列出的各种说明性逻辑块(illustrative logical block)和步骤(step)可以通过电子硬件、电脑软件，或两者的结合进行实现。这样的功能是通过硬件还是软件来实现取决于特定的应用和整个系统的设计要求。本领域技术人员对于相应的应用，可以使用各种方法实现所述的功能，但这种实现不应被理解为超出本申请实施例保护的范围。
可以理解，本申请实施例中的处理器可以是一种集成电路芯片，具有信号的处理能力。在实现过程中，上述方法实施例的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。上述的处理器可以是通用处理器、数字信号处理器(digital signal processor，DSP)、专用集成电路(application specific integrated circuit，ASIC)、现场可编程门阵列(field programmable gate array，FPGA)或者其它可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件。
本申请所描述的方案可通过各种方式来实现。例如，这些技术可以用硬件、软件或者硬件结合的方式来实现。对于硬件实现，用于在通信装置(例如，基站，终端、网络实体、或芯片)处执行这些技术的处理单元，可以实现在一个或多个通用处理器、DSP、数字信号处理器件、ASIC、可编程逻辑器件、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，或上述任何组合中。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。
可以理解，本申请实施例中的存储器可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(read-only memory，ROM)、可编程只读存储器(programmable ROM，PROM)、可擦除可编程只读存储器(erasable PROM，EPROM)、电可擦除可编程只读存储器(electrically EPROM，EEPROM)或闪存。 易失性存储器可以是随机存取存储器(random access memory，RAM)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的RAM可用，例如静态随机存取存储器(static RAM，SRAM)、动态随机存取存储器(dynamic RAM，DRAM)、同步动态随机存取存储器(synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(double data rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(synchlink DRAM，SLDRAM)和直接内存总线随机存取存储器(direct ram bus RAM，DR RAM)。应注意，本文描述的系统和方法的存储器旨在包括但不限于这些和任意其它适合类型的存储器。
可以理解，说明书通篇中提到的“实施例”意味着与实施例有关的特定特征、结构或特性包括在本申请的至少一个实施例中。因此，在整个说明书各个实施例未必一定指相同的实施例。此外，这些特定的特征、结构或特性可以任意适合的方式结合在一个或多个实施例中。可以理解，在本申请的各种实施例中，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
本申请中各表所示的对应关系可以被配置，也可以是预定义的。各表中的信息的取值仅仅是举例，可以配置为其他值，本申请并不限定。在配置信息与各参数的对应关系时，并不一定要求必须配置各表中示意出的所有对应关系。例如，本申请中的表格中，某些行示出的对应关系也可以不配置。又例如，可以基于上述表格做适当的变形调整，例如，拆分，合并等等。上述各表中标题示出参数的名称也可以采用通信装置可理解的其他名称，其参数的取值或表示方式也可以通信装置可理解的其他取值或表示方式。上述各表在实现时，也可以采用其他的数据结构，例如可以采用数组、队列、容器、栈、线性表、指针、链表、树、图、结构体、类、堆、散列表或哈希表等。
本申请中的预定义可以理解为定义、预先定义、存储、预存储、预协商、预配置、固化、或预烧制。
本领域普通技术人员可以理解，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
本领域普通技术人员可以理解，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
可以理解，本申请中描述的系统、装置和方法也可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(read-only memory，ROM)、随机存取存储器(random access memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
本申请中各个实施例之间相同或相似的部分可以互相参考。在本申请中各个实施例、以及各实施例中的各个实施方式/实施方法/实现方法中，如果没有特殊说明以及逻辑冲突，不同的实施例之间、以及各实施例中的各个实施方式/实施方法/实现方法之间的术语和/或描述具有一致性、且可以相互引用，不同的实施例、以及各实施例中的各个实施方式/实施方法/实现方法中的技术特征根据其内在的逻辑关系可以组合形成新的实施例、实施方式、实施方法、或实现方法。以上所述的本申请实施方式并不构成对本申请保护范围的限定。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。

Claims (27)

  1. 一种无线连接建立方法，其特征在于，所述方法包括：
    接收来自用户设备的第一建立请求，所述第一建立请求用于请求建立第一无线连接；
    确定未建立具有永久在线属性的第二无线连接；
    触发所述第一无线连接的建立，并触发所述第二无线连接的建立。
  2. 根据权利要求1所述的方法，其特征在于，所述第一无线连接为第一PDU会话对应的无线连接，所述第二无线连接为第二PDU会话对应的无线连接。
  3. 根据权利要求1所述的方法，其特征在于，所述第一无线连接为非PDU会话对应的无线连接，所述第二无线连接为PDU会话对应的无线连接。
  4. 根据权利要求1所述的方法，其特征在于，所述方法还包括：
    接收会话建立请求，所述会话建立请求用于请求所述第二无线连接对应的PDU会话；
    所述PDU会话对应的标识与指定标识列表匹配，记录所述PDU会话具有永久在线属性。
  5. 根据权利要求4所述的方法，其特征在于，所述PDU会话对应的标识为网络数据名称DNN，所述指定标识列表为指定DNN列表。
  6. 根据权利要求4所述的方法，其特征在于，所述PDU会话对应的标识为PDU会话标识PSI；所述指定标识列表为指定PSI列表。
  7. 根据权利要求1-6任一项所述的方法，其特征在于，所述方法还包括：
    检测到所述第二无线连接对应的第二会话管理网元存在故障，向所述用户设备发送重注册通知，所述重注册通知用于通知所述用户设备发送重注册请求；
    接收来自所述用户设备的所述重注册请求，所述重注册请求用于请求重新建立所述第二无线连接；
    根据所述重注册请求，重新触发所述第二无线连接的建立。
  8. 根据权利要求1-6任一项所述的方法，其特征在于，所述方法还包括：
    接收来自会话管理网元的重注册通知，并向所述用户设备发送所述重注册通知，所述重注册通知用于通知所述用户设备发送重注册请求；
    接收来自所述用户设备的所述重注册请求，所述重注册请求用于请求重新建立所述第二无线连接；
    根据所述重注册请求，重新触发所述第二无线连接的建立。
  9. 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，用于接收来自用户设备的第一建立请求，所述第一建立请求用于请求建立第一无线连接；
    所述处理单元，用于确定未建立具有永久在线属性的第二无线连接；触发所述第一无线连接的建立，并触发所述第二无线连接的建立。
  10. 根据权利要求9所述的装置，其特征在于，所述第一无线连接为第一PDU会话对应的无线连接，所述第二无线连接为第二PDU会话对应的无线连接。
  11. 根据权利要求9所述的装置，其特征在于，所述第一无线连接为非PDU会话对应的无线连接，所述第二无线连接为PDU会话对应的无线连接。
  12. 根据权利要求9所述的装置，其特征在于，
    所述通信单元，还用于接收会话建立请求，所述会话建立请求用于请求所述第二无线连接对应的PDU会话；
    所述处理单元，还用于所述PDU会话对应的标识与指定标识列表匹配，记录所述PDU 会话具有永久在线属性。
  13. 根据权利要求12所述的装置，其特征在于，所述PDU会话对应的标识为网络数据名称DNN，所述指定标识列表为指定DNN列表。
  14. 根据权利要求12所述的装置，其特征在于，所述PDU会话对应的标识为PDU会话标识PSI；所述指定标识列表为指定PSI列表。
  15. 根据权利要求9-12任一项所述的装置，其特征在于，
    所述通信单元，还用于在所述处理单元检测到所述第二无线连接对应的第二会话管理网元存在故障，向所述用户设备发送重注册通知，所述重注册通知用于通知所述用户设备发送重注册请求；接收来自所述用户设备的所述重注册请求，所述重注册请求用于请求重新建立所述第二无线连接；
    所述处理单元，还用于根据所述重注册请求，重新触发所述第二无线连接的建立。
  16. 根据权利要求9-12任一项所述的装置，其特征在于，
    所述通信单元，还用于接收来自会话管理网元的重注册通知，并向所述用户设备发送所述重注册通知，所述重注册通知用于通知所述用户设备发送重注册请求；接收来自所述用户设备的所述重注册请求，所述重注册请求用于请求重新建立所述第二无线连接；
    所述处理单元，还用于根据所述重注册请求，重新触发所述第二无线连接的建立。
  17. 一种通信装置，其特征在于，包括处理器和收发器；
    所述收发器，用于接收来自用户设备的第一建立请求，所述第一建立请求用于请求建立第一无线连接；
    所述处理单元，用于确定未建立具有永久在线属性的第二无线连接；触发所述第一无线连接的建立，并触发所述第二无线连接的建立。
  18. 根据权利要求17所述的装置，其特征在于，所述第一无线连接为第一PDU会话对应的无线连接，所述第二无线连接为第二PDU会话对应的无线连接。
  19. 根据权利要求17所述的装置，其特征在于，所述第一无线连接为非PDU会话对应的无线连接，所述第二无线连接为PDU会话对应的无线连接。
  20. 根据权利要求9所述的装置，其特征在于，
    所述收发器，还用于接收会话建立请求，所述会话建立请求用于请求所述第二无线连接对应的PDU会话；
    所述处理器，还用于所述PDU会话对应的标识与指定标识列表匹配，记录所述PDU会话具有永久在线属性。
  21. 根据权利要求20所述的装置，其特征在于，所述PDU会话对应的标识为网络数据名称DNN，所述指定标识列表为指定DNN列表。
  22. 根据权利要求20所述的装置，其特征在于，所述PDU会话对应的标识为PDU会话标识PSI；所述指定标识列表为指定PSI列表。
  23. 根据权利要求17-20任一项所述的装置，其特征在于，
    所述收发器，还用于在所述处理单元检测到所述第二无线连接对应的第二会话管理网元存在故障，向所述用户设备发送重注册通知，所述重注册通知用于通知所述用户设备发送重注册请求；接收来自所述用户设备的所述重注册请求，所述重注册请求用于请求重新建立所述第二无线连接；
    所述处理器，还用于根据所述重注册请求，重新触发所述第二无线连接的建立。
  24. 根据权利要求17-20任一项所述的装置，其特征在于，
    所述收发器，还用于接收来自会话管理网元的重注册通知，并向所述用户设备发送所述重注册通知，所述重注册通知用于通知所述用户设备发送重注册请求；接收来自所述用户设备的所述重注册请求，所述重注册请求用于请求重新建立所述第二无线连接；
    所述处理器，还用于根据所述重注册请求，重新触发所述第二无线连接的建立。
  25. 一种通信装置，其特征在于，所述通信装置包括处理器和存储器；
    所述存储器用于存储计算机程序；
    所述处理器用于执行所述存储器存储的计算机程序，使得所述装置实现如权利要求1至8任一项所述的方法。
  26. 一种通信装置，包括至少一个处理器和通信接口，所述至少一个处理器用于执行计算机程序，所述通信接口用于输入和/或输出信息，使得所述装置实现如权利要求1至8中任一项所述的方法。
  27. 一种计算机可读存储介质，其特征在于，用于存储计算机程序，当所述计算机程序在计算机上运行时，使得所述计算机执行如权利要求1至8中任一项所述的方法。
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