WO2019101074A1 - 一种通信方法、装置及系统 - Google Patents

一种通信方法、装置及系统 Download PDF

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Publication number
WO2019101074A1
WO2019101074A1 PCT/CN2018/116535 CN2018116535W WO2019101074A1 WO 2019101074 A1 WO2019101074 A1 WO 2019101074A1 CN 2018116535 W CN2018116535 W CN 2018116535W WO 2019101074 A1 WO2019101074 A1 WO 2019101074A1
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WIPO (PCT)
Prior art keywords
information
terminal
dnn
amf
core network
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PCT/CN2018/116535
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English (en)
French (fr)
Inventor
刘睿智
吴义壮
熊春山
周铮
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华为技术有限公司
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Publication of WO2019101074A1 publication Critical patent/WO2019101074A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/02—Arrangements for increasing efficiency of notification or paging channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/26—Network addressing or numbering for mobility support

Definitions

  • the embodiments of the present application relate to the field of communications technologies, and in particular, to a communication method, apparatus, and system.
  • the system architecture of the fifth generation (5th generation, 5G) communication system is divided into two parts: the access network and the core network.
  • the access network is used to implement functions related to wireless access.
  • the core network includes a plurality of network elements, wherein a unified data management (UDM) entity is used to manage the subscription data of the terminal and the registration information related to the terminal.
  • the UDM stores the identifier (DN number, DNN) of the data network (DN), and the DNN is used to identify different DNs.
  • the subscription data corresponding to the contract between the user who uses the terminal and the operator can be identified by the DNN and the user ID.
  • the access and mobility management function (AMF) entity in the core network is responsible for terminal registration, mobility management, tracking area update process, and the like.
  • the SMF entity acquires the subscription data of the terminal from the UDM entity. Specifically, the SMF entity sends a subscription data request message to the UDM entity, and the UDM entity returns a subscription data response message carrying the subscription data to the SMF entity. Then, the communication system performs session authentication, and the SMF selects a policy control function (PCF) entity for the terminal, and obtains a policy and charging control (PCC) rule from the PCF entity. The SMF entity selects an appropriate UPF entity for the terminal according to the location information of the terminal, the subscription data, and the SSC mode(s), and assigns an IP address to the terminal for the session.
  • PCF policy control function
  • PCC policy and charging control
  • the subscription change of the DNN refers to the change of the subscription identified by the DNN.
  • the subscription of the DNN changes if the terminal has established a session with the DN of the DNN, the session needs to be released. If the terminal does not establish a session with the DN identified by the DNN, Then the terminal cannot establish a session with the DN identified by the DNN.
  • the embodiment of the present application provides a communication method, device, and system for notifying a terminal of information about a subscription change of a terminal and a DNN.
  • the first aspect provides a communication method, where the communication method includes the following steps: the first core network element receives the notification information of the second core network element, and the notification information is used to indicate the subscription change of the DNN; After receiving the notification information, the core network element sends the first information to the terminal, where the first information is used to notify the terminal of the subscription change of the DNN. In this way, by transmitting the information of the subscription change carrying the DNN to the terminal through the core network element, the purpose of notifying the subscription change of the terminal DNN can be achieved.
  • the subscription change of the DNN is the subscription data deletion of the DNN, or the subscription data of the DNN is added.
  • the subscription change of the DNN can be understood as a change in the subscription data of the DNN.
  • the DNN subscription change can also be unavailable for the DNN.
  • the DNN is a local area data network LADN DNN
  • the first core network element may notify the terminal of the subscription change of the LADN DNN by implicitly carrying information.
  • the following manner may be adopted. Any one of the service areas that carry the LADN DNN and does not carry the LADN; or the first information carries the service area list of the LADN DNN and the LADN, and the LADN
  • the service area list is empty; or the first information carries the service area of the LADN DNN and the LADN, and the service area size of the LADN is 0; in this application scenario, the first information is further used.
  • the terminal is instructed to set the LADN DNN to be unavailable or delete the LADN DNN or delete the LADN information. In this way, by notifying the terminal by means of implicitly carrying information, it is possible to save the indication information in the first information, which helps to save signaling overhead.
  • the first core network element sending the first information to the terminal may be implemented by: The first core network element sends the first information to the terminal when the condition is met; wherein the condition is that the terminal does not establish a packet data unit PDU session with the data network DN identified by the DNN. That is, if the terminal has established a PDU session with the DN identified by the DNN, the AMF does not send the first information to the terminal according to the notification information of the UDM, and the SMF sends the first information to the terminal according to the notification information of the UDM.
  • the first information sent by the SMF to the terminal by the AMF and the access network device after receiving the first information sent by the SMF, the AMF forwards the first information sent by the SMF, where the first information carries the subscription change of the DNN. Information.
  • the UDM sends the notification information to the AMF and the SMF respectively
  • the AMF can only notify the terminal of the subscription change by sending the information to the terminal only once, which saves the network side signaling overhead and the air interface signaling overhead.
  • the network side is prevented from initiating at least two pagings, thereby further saving signaling overhead.
  • the first core network element if the first core network element is an AMF, the first core network element sends the first information to the terminal, which can be implemented in the following manner: the AMF is in the receiving session management. After the second information sent by the function SMF, the first information is sent to the terminal.
  • the UDM sends the notification information to the AMF and the SMF respectively
  • the AMF can only notify the terminal of the subscription change by sending the information to the terminal only once, which saves the network side signaling overhead and the air interface signaling overhead.
  • the network side is prevented from initiating at least two pagings, thereby further saving signaling overhead.
  • the first core network element if the first core network element is an AMF and the second core network element is a unified data management UDM, the first core network element sends the first information to the terminal.
  • the AMF determines that the terminal has established a PDU session with the DN identified by the DNN, and starts a timer; when the timer expires, the AMF sends the First information; or, the AMF, before the expiration of the timer, determines that the number of second information received by the SMF reaches a predetermined value, and sends the first information to the terminal.
  • the AMF waits to receive the second information sent by the SMF.
  • the AMF can only notify the terminal of the subscription change by sending the information to the terminal only once, which saves the network side signaling overhead and the air interface signaling overhead.
  • the terminal is in the idle state, the network side is prevented from initiating at least two pagings, thereby further saving signaling overhead.
  • the signaling waste caused by sending the PDU session related information in each release PDU process is avoided, the subscription change information sent by the AMF to the terminal, the subscription change information sent by the SMF to the terminal, and the SMF sending to the terminal are mostly sent.
  • the secondary PDU session related information is sent to the terminal at one time, which helps to save the air interface signaling overhead. If the indication of the subscription change is carried in the PDU session related information, the system resources are further saved.
  • the AMF entity sends the first information to the terminal according to the second information if the second information sent by the SMF entity has been received when the timer expires,
  • the first information is further used to instruct the terminal to delete PDU session information.
  • the AMF can only notify the terminal of the subscription change by sending the information to the terminal once, which saves the network side signaling overhead and the air interface signaling overhead.
  • the second information is PDU session related information
  • the first information is used to instruct the terminal to delete PDU session information. In this way, the information about the contract change of the terminal DNN can be notified in the PDU session release process, and system resources are saved.
  • the first core network element is an AMF
  • the second core network element is a UDM
  • the first information is further used to indicate that the terminal deletes PDU session information
  • the method may further include the following steps: the first core network element receives the third information sent by the SMF, and the third information is used to instruct the access network device to delete the PDU session established by the terminal and the data network DN identified by the DNN.
  • the first core network element sends the fourth information to the access network device according to the third information, where the fourth information is used to instruct the access network device to delete the PDU session context.
  • the SMF side not only informs the access network device of the information of the DNN subscription change, but does not notify the terminal, thereby saving the access network device to the terminal.
  • Air interface signaling overhead when the UDM sends the notification information of the DNN subscription change to the AMF and the SMF respectively, the SMF side not only informs the access network device of the information of the DNN subscription change, but does not notify the terminal, thereby saving the access network device to the terminal.
  • the third information is further used to indicate to the first core network element that if the terminal is in an idle state, the terminal is not paged.
  • the method further includes the following steps: the first core network element to the policy control
  • the function PCF notifies that the subscription change is used to instruct the PCF to update the user equipment UE routing policy URSP; the first information carries the updated URSP, and is used to instruct the terminal to update the URSP. In this way, when the subscription of the DNN changes, the updated URSP can be notified to the terminal.
  • the second core network element may be a UDM or an AMF.
  • a communication method may comprise the steps of: the session management function SMF receiving notification information, the notification information being used to indicate a subscription change of the data network name DNN; the SMF sending to the access network device Information for indicating that the access network device deletes a context of a packet data unit PDU session established by the terminal with a data network DN identified by the DNN.
  • the UDM sends the notification information of the DNN subscription change to the AMF and the SMF respectively
  • the AMF notifies the terminal of the subscription change of the DNN, and the SMF side not only informs the access network device of the information of the DNN subscription change, but does not notify the terminal.
  • the notification saves the air interface signaling overhead of the access network device to the terminal.
  • the SMF also indicates an access and mobility management function AMF: if the terminal is in an idle state, the terminal is not paged.
  • a communication method comprising the steps of: a unified data management UDM determining a subscription change of a data network name DNN; the UDM transmitting notification information to a session management function SMF, and/or the UDM
  • the access and mobility management function AMF sends notification information; wherein the notification information is used to indicate a subscription change of the data network name DNN.
  • the notification information is used to indicate a subscription change of the data network name DNN.
  • the UDM when the terminal has established a packet data unit PDU session with the data network DN identified by the DNN, the UDM sends notification information to the SMF, or the UDM respectively goes to the SMF and The AMF sends the notification information; when the terminal does not establish a PDU session with the DN identified by the DNN, the UDM only sends the notification information to the AMF.
  • a fourth aspect provides a communication method, where the method includes the following steps: the terminal receives the first information sent by the core network element, where the core network element is an access and mobility management function AMF, or a session management function SMF.
  • the first information is used to indicate a subscription change of the data network name DNN; the terminal deletes the data and context of the DNN according to the first information, or adds DNN data.
  • the terminal can notify the terminal DNN of the subscription change by receiving the information of the subscription change of the DNN transmitted by the core network element.
  • the core network element is a PCF
  • the terminal updates the user equipment UE routing policy URSP according to the first information.
  • a communication apparatus having the function of implementing the behavior of the first core network element in any of the possible aspects of the first aspect and the first aspect.
  • the functions may be implemented by hardware or by corresponding software implemented by hardware.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the structure of the apparatus includes a transceiver and a processor, wherein the processor is configured to invoke a set of programs to perform any of the possible designs as in the first aspect and the first aspect described above. The method described.
  • the apparatus further includes a memory for storing a program executed by the processor.
  • an AMF having the functionality to implement the AMF behavior of any of the possible aspects of any of the above aspects and any of the aspects.
  • the functions may be implemented by hardware or by corresponding software implemented by hardware.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the structure of the apparatus includes a transceiver and a processor, wherein the processor is configured to invoke a set of programs to perform any of the possible designs as in the first aspect and the first aspect described above. The method described.
  • the apparatus further includes a memory for storing a program executed by the processor.
  • an SMF having a function of implementing SMF behavior in any of the possible designs of any of the above aspects and any of the aspects.
  • the functions may be implemented by hardware or by corresponding software implemented by hardware.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the structure of the apparatus includes a transceiver and a processor, wherein the processor is configured to invoke a set of programs to perform any of the possible designs as in the first aspect and the first aspect described above. The method described.
  • the apparatus further includes a memory for storing a program executed by the processor.
  • a UDM having the functionality to implement the UDM behavior of any of the possible aspects of any of the above aspects and any of the aspects.
  • the functions may be implemented by hardware or by corresponding software implemented by hardware.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the structure of the apparatus includes a transceiver and a processor, wherein the processor is configured to invoke a set of programs to perform any of the possible designs as in the first aspect and the first aspect described above. The method described.
  • the apparatus further includes a memory for storing a program executed by the processor.
  • a PCF having the functionality to implement PCF behavior in any of the possible aspects of any of the above aspects and any of the aspects.
  • the functions may be implemented by hardware or by corresponding software implemented by hardware.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the structure of the apparatus includes a transceiver and a processor, wherein the processor is configured to invoke a set of programs to perform any of the possible designs as in the first aspect and the first aspect described above. The method described.
  • the apparatus further includes a memory for storing a program executed by the processor.
  • a communication apparatus having a function of realizing terminal behavior in any of the possible aspects of the first aspect and the first aspect described above.
  • the functions may be implemented by hardware or by corresponding software implemented by hardware.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the structure of the apparatus includes a transceiver and a processor, wherein the processor is configured to invoke a set of programs to perform any of the possible designs as in the first aspect and the first aspect described above. The method described.
  • the apparatus further includes a memory for storing a program executed by the processor.
  • a communication system comprising a unified data management UDM for transmitting notification information to an access and mobility management function AMF and/or a session management function SMF, the notification information being used to indicate a data network a subscription change of the name DNN, the AMF or the SMF, configured to receive the notification information of the UDM, and send the first information to the terminal, where the first information is used to notify the terminal of the subscription change of the DNN
  • the terminal is configured to receive first information sent by the AMF and/or the SMF, delete data and context of the DNN according to the first information, or add DNN data.
  • the communication system further includes a PCF for performing the functions performed by the UDM in any of the possible aspects of any of the above aspects and any of the aspects.
  • the UDM in the communication system is configured to perform the functions performed by the UDM in any of the above aspects and any of the possible aspects of the SMF, the SMF in the communication system is used to perform any of the above aspects And a function performed by the SMF in any of the possible designs of any of the aspects, the terminal in the communication system for performing the functions performed by the terminal in any of the possible aspects of any of the above aspects and any of the aspects.
  • a computer storage medium storing a computer program comprising instructions for performing the method of the above aspects.
  • a computer program product comprising instructions for causing a computer to perform the methods described in the above aspects when run on a computer is provided.
  • FIG. 1 is a schematic structural diagram of a communication system in an embodiment of the present application.
  • FIG. 2 is a schematic diagram of a PDU session release process in an embodiment of the present application.
  • FIG. 3 is a schematic diagram of a LADN application scenario in an embodiment of the present application.
  • FIG. 4 is a schematic flowchart of a communication method in an embodiment of the present application.
  • FIG. 5 is a schematic diagram of a main process of implementing manner 1 in the embodiment of the present application.
  • FIG. 5b is a schematic diagram of a signaling interaction process of implementation manner 1 in the embodiment of the present application.
  • 6a is a schematic diagram of a main process of implementing mode 2 in the embodiment of the present application.
  • FIG. 6b is a schematic diagram of a signaling interaction process of implementation manner 2 in the embodiment of the present application.
  • FIG. 7a is a schematic diagram of a main process of implementing mode 3 in the embodiment of the present application.
  • FIG. 7b is a schematic diagram of a third signaling interaction process in the embodiment of the present application.
  • FIG. 8 is a schematic diagram of a main process of implementing method 4 in the embodiment of the present application.
  • FIG. 8b is a schematic diagram of a signaling interaction process of implementation manner 4 in the embodiment of the present application.
  • 9a is a schematic diagram of a main process of implementing manner 5 in the embodiment of the present application.
  • FIG. 9b is a schematic diagram of an implementation manner 5 signaling interaction process in the embodiment of the present application.
  • 10a is a schematic diagram of a main process of implementing manner 6 in the embodiment of the present application.
  • FIG. 10b is a schematic diagram of a method 6 for implementing signaling interaction in the embodiment of the present application.
  • 11a is a schematic diagram of a main process of implementing manner 7 in the embodiment of the present application.
  • FIG. 11b is a schematic diagram of a signaling interaction process of implementation manner 7 in the embodiment of the present application.
  • FIG. 12 is a schematic structural diagram of a communication device according to an embodiment of the present application.
  • FIG. 13 is a schematic structural diagram of an AMF according to an embodiment of the present application.
  • FIG. 14 is a schematic structural diagram of an SMF according to an embodiment of the present application.
  • 16 is a second schematic structural diagram of a communication device according to an embodiment of the present application.
  • FIG. 17 is a schematic structural diagram of a core network element in the embodiment of the present application.
  • FIG. 18 is a schematic structural diagram of an AMF in an embodiment of the present application.
  • FIG. 19 is a schematic structural diagram of an SMF according to an embodiment of the present application.
  • FIG. 21 is a third schematic structural diagram of a communication device according to an embodiment of the present application.
  • the present application provides a communication method, apparatus, and system for implementing notification of information about a subscription change of a DNN to a terminal.
  • the method and the device are based on the same inventive concept. Since the principles of the method and the device for solving the problem are similar, the implementation of the device and the method can be referred to each other, and the repeated description is not repeated.
  • Figure 1 shows an architecture of an optional communication system to which the communication method provided by the embodiment of the present application is applicable.
  • the communication system includes: a terminal 101, an access network (AN) Device 102, access and mobility management function (AMF) 103, session management function (SMF) 104, PCF 105, application function (AF) 106, user plane function (user) A plane function (UPF) 107, a data network (DN) 108, a unified data management (UDM) 110, and an authentication server function (AUSF) 110.
  • AN access network
  • AMF access and mobility management function
  • SMF session management function
  • AF application function
  • UPF user plane function
  • DN data network
  • UDM unified data management
  • AUSF authentication server function
  • the terminal 101 which is also referred to as a user equipment (UE), a mobile station (MS), a mobile terminal (MT), etc., is a voice and/or data connectivity provided to the user. device of.
  • the terminal device includes a handheld device having a wireless connection function, an in-vehicle device, and the like.
  • the terminal devices can be: mobile phones, tablets, laptops, PDAs, mobile internet devices (MIDs), wearable devices, virtual reality (VR) devices, augmented reality ( Augmented reality, AR) wireless terminal in equipment, industrial control, wireless terminal in self driving, wireless terminal in remote medical surgery, smart grid
  • a wireless terminal in a transportation safety a wireless terminal in a smart city, or a wireless terminal in a smart home.
  • the AN device 102 is a device in the communication system that connects the terminal 101 to a wireless network.
  • the AN device is a node in a radio access network, and may also be referred to as a base station, and may also be referred to as a radio access network (RAN) node (or device).
  • RAN radio access network
  • AN devices are: gNB, transmission reception point (TRP), evolved Node B (eNB), radio network controller (RNC), and Node B (Node).
  • B, NB transmission reception point (TRP), evolved Node B (eNB), radio network controller (RNC), and Node B (Node).
  • B, NB base station controller
  • BTS base transceiver station
  • home base station for example, home evolved NodeB, or home Node B, HNB
  • BBU wireless fidelity (Wifi) access point (AP).
  • the DN 108 may be the Internet, an IP Multi-media Service (IMS) network, a regional network (ie, a local network such as a mobile edge computing (MEC) network).
  • IMS IP Multi-media Service
  • MEC mobile edge computing
  • the DN includes an application server, and the application server provides a service service for the terminal 101 by performing data transmission with the terminal 101.
  • the core network is used to connect the terminal 101 to the DN 108 that can implement the service of the terminal 101.
  • the function of each network element in the core network is described below.
  • the AMF 103 can be used to be responsible for registration of the terminal 101, mobility management, tracking area update procedure, reachability detection, selection of the SMF 104, and mobile state transition management.
  • the SMF 104 can be used to be responsible for session management (including establishment, modification, and release of sessions) of the terminal 101, selection and reselection of the UPF 107, IP address allocation of the terminal 101, QoS control, and the like.
  • the PCF 105 can be used to perform policy control decisions, provide services based on traffic and application detection, gating, QoS, and flow-based charging control.
  • the main function is to interact with the 3rd generation partnership project (3GPP core network to provide services to influence service flow routing, access network capability opening, policy control, etc.).
  • 3GPP core network 3rd generation partnership project
  • the UDM 109 can be used to manage subscription data of the terminal device 101 and registration information related to the terminal device 101.
  • the main function is to provide authentication services.
  • the UPF 107 can be used to forward the user plane data of the terminal 101.
  • the main functions are packet routing and forwarding, mobility anchors, and uplink classifiers to support routing traffic to data networks and branch points to support multi-homed Packet Data Unit (PDU) sessions.
  • PDU Packet Data Unit
  • DN108 such as carrier services, Internet access or third party services.
  • Each of the above network element functions may also be referred to as a functional entity, or a network element.
  • the AMF 103 is referred to as an AMF entity 103.
  • the network element function can be either a network component implemented on dedicated hardware, an instance of software running on dedicated hardware, or an instance of virtualization function on an appropriate platform.
  • the virtualization platform can be a cloud platform.
  • the embodiment of the present application does not limit the distribution manner of each network element function in the core network.
  • the network element function in the core network may also include other functions formed by combining any of the foregoing multiple network element functions.
  • An entity for example, a functional entity having both session management and policy control functions, or a functional entity having three functions of session management, access and mobility management, and policy control.
  • the communication system shown in Fig. 1 does not constitute a limitation of the communication system to which the embodiment of the present application can be applied.
  • the communication system architecture shown in FIG. 1 is a non-roaming 5G system architecture.
  • the method in the embodiment of the present application is also applicable to a roaming 5G system architecture and various communication networks suitable for the future.
  • a PDU session is a connection between a terminal and a DN, and provides a PDU connectivity service.
  • the type of connection can be Internet Protocol (IP), Ethernet or unstructured data.
  • IP Internet Protocol
  • the PDU connection service supported by the core network refers to a service that provides PDU exchange between the terminal and the DN determined by the DN identifier (DNNN).
  • the terminal can establish multiple PDU sessions to connect to the same DN or different DNs.
  • the terminal can establish a PDU session served by different UPFs to connect to the same DN.
  • the active state of the PDU session refers to the state in which the user plane resources of the PDU session have been established.
  • An end-to-end connection is established between the terminal and the DN, and data can be transmitted.
  • the deactivated state of the PDU session means that only a part of the user plane is reserved for the PDU session.
  • the resource, the user plane air interface resource between the UE and the (R) AN, and the connection between the (R) AN and the UPF are not established, and data cannot be transmitted between the UE and the DN.
  • Some information of the PDU session is still reserved in the SMF and the UPF.
  • PDU session release process An optional PDU session release procedure is illustrated in FIG. 2.
  • the SMF receives a request from another network device and decides to release a PDU session. For example, a request for a DN is received, or a request for a UDM is received, or a request for an online charging system (OCS) is received.
  • OCS online charging system
  • the condition or cause that triggers the release of the PDU session is included in the request, for example, the subscription change of the terminal with the DNN.
  • the SMF releases the IP address/prefix assigned to the PDU session and the corresponding user plane resource.
  • the SMF sends an N4 Session Release Request (including an N4 Session Identification (ID)) message to the UPF.
  • the UPF discards the remaining data packets of any PDU session and releases all tunnel resources and contexts associated with the N4 session.
  • UPF responds to the N4 session release request by sending an N4 Session Release Response (including N4 Session ID) message to the SMF.
  • N4 Session Release Response including N4 Session ID
  • the SMF responds to the AMF by the Namf_Communication_N1N2 Information Transformation (Namf_Communication_N1N2MessageTransfer) service operation.
  • the Namf_Communication_N1N2MessageTransfer includes an N1SM information (Information) and an N2 SM resource release request.
  • the N1 SM Information includes a PDU Session Release Command.
  • the PDU Session Release Command contains the PDU Session ID and the reason for the release.
  • Namf_Communication_N1N2MessageTransfer includes N1 SM Information, skip indicator.
  • the N1SM Information contains the PDU Session Release Command.
  • the Skip indicator is used to indicate whether the AMF may skip the AMF to send the N1SM container to the terminal.
  • the SMF needs to carry the N2 Resource Release request in the Namf_Communication_N1N2MessageTransfer, and the N2 Resource Release request carries the PDU Session ID, which is used to release the (R) associated with the PDU session.
  • AN resources
  • the AMF sends an N11 message to the terminal, and the N11 message carries the skip indicator. Steps 205-207 are skipped.
  • the AMF initiates a network-triggered service request procedure to send the non-access stratum (Non-Access Stratum, NAS).
  • the message is sent to the terminal, and the NAS message carries the PDU session ID and N1 SM information.
  • the AMF forwards the SM message (including the N2 SM Resource Release request, N1 SM information) received from the SMF to the (R) AN.
  • the (R)AN receives the SM message (including the N2 SM Resource Release request, N1 SM information) sent by the AMF, and releases the air interface resource of the (R) AN side related to the PDU session, and deletes the PDU session context.
  • the SM message including the N2 SM Resource Release request, N1 SM information
  • the (R)AN and the terminal exchange AN-specific signaling (such as an AN-specific resource modification) to release the air interface resource on the (R) AN side related to the PDU session, for example, in the case of the 3GPP RAN, through the radio resource.
  • the radio resource control connection reconfiguration (RRC) is used to release the air interface resources on the (R) AN side related to the PDU session.
  • the (R)AN may carry any NAS message received from the AMF in the RRC signaling, for example, the N1SM PDU Session Release Command.
  • the terminal feedback NAS message (including PDU session ID, N1 SM information (PDU Session Release Ack)) responds to the PDU session release command, for example, through the (1) N1SM signaling of the AN.
  • the (R)AN If the (R)AN receives an N2SM request to release the AN resource, the (R)AN responds to the N2 SM resource release request to the AMF by sending an N2 SM Resource Release Ack message.
  • the N2 SM Resource Release Ack message includes N1SM information (PDU Session Release Ack) and User Location Information.
  • the (R)AN only forwards the NAS message (PDU Session Release Ack) from the terminal to the AMF.
  • the PDU session release process further includes more signaling interactions, and only the interaction process related to the embodiment of the present application is shown in FIG. 2 .
  • LADN Local data network
  • SA The service area (SA) of the LADN includes a tracking area (TA) list, and the LADN can be accessed only when the terminal is located in the SA of the LADN.
  • TA tracking area
  • the network should release the PDU session (LADN PDU session) for which the terminal accesses the LADN or deactivate the user plane of the PDU session.
  • the LADN SA includes three TAs, which are represented by TA1, TA2, and TA3, respectively.
  • RAN1 Since RAN1 is within the LADN SA coverage, when the terminal moves to RAN1, a session to access the LADN can be established through RAN1. When the terminal moves to RAN2, since RAN2 is not within the LADN SA coverage, the terminal cannot access the LADN through RAN2.
  • DNN used to identify different DNs.
  • the storage and notification of the subscription data in the network side and the terminal side can be identified by the ID of the terminal and the DNN.
  • the contract data refers to the data related to the contract stored on the network side and the terminal side respectively.
  • the UDM stores and manages the subscription data related to the terminal for each terminal.
  • the subscription data related to the terminal (which may be simply referred to as the subscription data of the terminal) includes using the terminal to access all the subscription authorizations.
  • the contract data on which the DN is based, the DN is identified by the DNN.
  • the subscription data of the UDM to the terminal can be stored and managed in a DNN granularity.
  • the subscription data of one terminal includes subscription data of one or more DNNs, and the subscription data of one DNN is performed by the terminal and the DN identified by the DNN.
  • the contract data on which the communication is based.
  • the subscription data may also be stored in other functional entities/network elements. Among them, the subscription data in the UDM exists for a long time; other network elements or terminals may obtain the subscription data directly or indirectly from the UDM when the terminal registers the network or establishes a PDU session or other related processes.
  • the signing of the DNN may refer to the signing data of the DNN, and may also refer to the signing of the DN that the terminal identifies to access the DNN.
  • the signing change refers to the change of the contract between the user who uses the terminal and the operator.
  • the subscription change of the DNN refers to the contract change of the DNN, or the subscription change that needs to be observed by using the terminal to access the DN identified by the DNN.
  • DNN's contract changes can include the following: DNN's subscription data deletion, DNN's subscription data addition, DNN's subscription deletion, and DNN's subscription.
  • the new signing of the DNN refers to the signing of the contract that needs to be complied with by using the terminal to access the DN identified by the new DNN.
  • the new contract data of DNN refers to the increased contract data based on the addition of new DNN.
  • DNN's subscription data deletion means that all DNN contract data is deleted.
  • the DNN may also be unavailable, for example, the user who uses the terminal cannot use the DNN, or the user who uses the terminal cannot access the DN identified by the DNN, and the like.
  • the terminal may not be able to establish a PDU session with the DN identified by the DNN in which the subscription change occurs, or the terminal needs to delete the PDU session information that has been established between the terminal and the DN identified by the DNN in which the subscription change occurs. , or the terminal needs to delete the data and context of the DNN, or the terminal needs to add DNN data.
  • the change of the contract data refers to the change of the data related to the subscription stored in the network side and the terminal side.
  • the contract data change can include: signing data deletion and signing data addition.
  • the deletion of subscription data may also result in some old subscription data being unavailable, and the deletion of subscription data may be caused by the deletion of the subscription.
  • the subscription change described in the following description of the present application is a contract change in a broad sense, including the contract change described in the above 8) and the contract data change described in the above point 9).
  • the contracted change refers to a broad meaning.
  • the contract change refers to a change in the contract between the user who uses the terminal and the operator, or the user and operation of the terminal that is stored on the network side or the terminal side.
  • the contract data of the business has changed.
  • the embodiment of the present application provides a communication method for notifying the terminal of the subscription change information of the DNN by the core network element when the subscription change of the DNN occurs.
  • the contract change of the DNN can be briefly described as a contract change.
  • the communication method provided by the embodiment of the present application is applicable to the communication system shown in FIG. 1. Referring to FIG. 4, the process of the method includes:
  • the second core network element sends the notification information to the first core network element, where the first core network element receives the notification information of the second core network element, where the notification information is used to indicate the subscription change.
  • the first core network element sends the first information to the terminal, where the terminal receives the first information sent by the first core network element, where the first information is used to notify the terminal DNN of the subscription change.
  • the terminal deletes data and a context of the DNN in which the subscription change occurs, or adds data of the DNN.
  • the terminal needs to delete the LADN DNN information.
  • the terminal may also delete the PDU session information.
  • the core network element sends a message carrying the information indicating the change of the subscription to the terminal, so that the purpose of notifying the terminal of the subscription change can be achieved.
  • the UDM stores the subscription data, and the UDM can determine whether a subscription change occurs.
  • the UDM can send the notification information to the AMF, or send the notification information to the SMF, or send the notification information to both the AMF and the SMF.
  • the notification information is used to indicate a contract change.
  • the UDM notifies the SMF of the subscription change when the terminal establishes a PDU session with the DN identified by the DNN according to the context of the stored terminal regarding the session management or the PDU session, or the UDM notifies the SMF and the AMF of the subscription change.
  • the notification can be sent via a notification message or can be carried in other messages.
  • the SMF After receiving the notification, the SMF triggers the PDU session release process, and the SMF sends the subscription change information to the terminal in the PDU session release process.
  • the subscription change may be specifically for the subscription data deletion or the subscription data addition, and the specific transmission form is The text is described in detail.
  • the UDM determines that the terminal does not establish a PDU session with the DN identified by the DNN according to the stored terminal regarding the session management context or the context of the PDU session, the UDM may only notify the AMF of the subscription change, and may not notify the SMF of the subscription change, and the AMF receives After the notification, the information of the contract change is sent to the terminal.
  • the UDM notifies the AMF and the SMF of the subscription change, the signaling on the network side will be wasted.
  • the AMF and the SMF will notify the terminal of the subscription change, which will result in waste of air interface signaling. Synchronization, when the terminal is in the idle state, will cause repeated triggering of paging and increase signaling overhead.
  • the selected core network element such as SMF or AMF
  • the selected core network element notifies the terminal of the change of the subscription information, which can help reduce signaling. Overhead, avoiding wasted resources.
  • the solid line with no arrow in the following figure 5a, 6a, 7a, 8a, 9a, 10a, and 11a identifies the interface between the network elements, and the solid line with an arrow indicates that the information is transmitted through the interface for convenience. It is shown that only some of the network elements or devices in the communication system architecture are shown in Figures 5a, 6a, 7a, 8a, 9a, 10a and 11a.
  • the implementation method 1 can be applied to the application scenario in which the DNN is the LADN DNN.
  • FIG. 5a is a schematic diagram of a main flow of implementation 1.
  • the first core network element is an AMF entity
  • the second core network element is a UDM entity.
  • the UDM sends the notification information for indicating the subscription change to the AMF.
  • the AMF sends the first information to the terminal, and the terminal receives the first information sent by the AMF, where the first information is used to notify the terminal of the subscription change.
  • FIG. 5b shows a schematic diagram of a signaling interaction procedure of implementation 1. As shown in Figure 5b:
  • the UDM sends notification information to the AMF, where the notification information is used to indicate a subscription change to the AMF.
  • the notification information may include an indication of a DNN, a subscription change of the DNN, and a subscriber permanent identifier (SUPI).
  • the indication of the contract change of the DNN may include at least one of the following: a DNN unavailable indication, a DNN deleted indication, a DNN subscription data deletion indication, a DNN subscription data addition indication, and a new DNN.
  • Contract data contract data type (such as mobile subscription, or session management contract). If the DNN is a LADN DNN, the notification includes: LADN DNN, an indication that the LADN DNN has changed, SUPI.
  • the indication that the LADN DNN changes may include at least one of the following: a LADN DNN unavailable indication, a LADN DNN deleted indication, a LADN DNN subscription data deletion indication, and a LADN DNN subscription data addition. Indication, new LADN DNN subscription data, contract data type (for example, mobile subscription, or session management subscription).
  • the content of the notification information may also be applied to the notification information used to indicate the subscription change of the DNN in other implementations.
  • the AMF performs a certain operation according to the received notification information, for example, setting the DNN to be unavailable, or deleting the data of the DNN, or saving the information of the newly added DNN.
  • the AMF sends the first information to the terminal, where the first information is used to notify the terminal of the subscription change.
  • the sending, by the AMF, the first information to the terminal may carry an indication information, where the indication information is used to indicate that the terminal subscribes to the change.
  • the first information may carry an indication information, which is used to notify the terminal of the subscription change; or the AMF may notify the terminal of the subscription change by means of an implicit indication, for example, only the first information is carried.
  • the service area of the DNN and LADN, and the service area size of the LADN is 0.
  • the AMF sends a LADN DNN and a service area of the LADN of the size 0 to the terminal, and notifies the LADN and the service area that the terminal can use. If the implicit carrying indication is used, the terminal can be notified to the terminal of the LADN-related subscription. Variety.
  • the terminal After receiving the first information, the terminal determines, according to the first information, a subscription change of the DNN. And determining, according to the first information, the specific type of the subscription change of the DNN. If the subscription data of the specific type is DNN is deleted, the terminal deletes the data and the context of the DNN, and if the subscription data of the specific type is DNN is added, the terminal saves the new one. DNN data. If the specific type is DNN is not available, the terminal sets DNN to be unavailable.
  • the terminal deletes the LADN DNN information after receiving the first information.
  • the terminal After receiving the first information, if the first information carries only the LADN DNN, the service area that does not carry the LADN or the service area of the carried LADN is 0, or the first information carries the LADN DNN and A list of service areas of the LADN, and the list of service areas of the LADN is empty. Then, the contract change of the LADN DNN is determined, and the terminal deletes the LADN DNN information.
  • S503 and S504 have no sequential execution order, and the two steps can also be performed simultaneously.
  • the AMF determines that the terminal configuration needs to be updated or the terminal needs to initiate a registration process based on one or more reasons (eg, terminal mobility change, network policy, subscription data change). Specifically, the AMF sends a terminal configuration update command to the terminal, including parameters of the terminal: 5G globally unique temporary identity (5G-GUTI), tracking area identifier list (TAI List), LADN information (LADN information), network Network identity and time zone (NITZ), UE configuration update cause. If the terminal configuration update reason requires a response from the terminal configuration update command, the terminal sends a terminal configuration update completion message to the AMF.
  • 5G-GUTI 5G globally unique temporary identity
  • TAI List tracking area identifier list
  • LADN information LADN information
  • NITZ network Network identity and time zone
  • the first information may be a terminal configuration update command (UE configuration update command), that is, the AMF carries an indication of the subscription change in the UE configuration update command sent to the terminal.
  • UE configuration update command UE configuration update command
  • the first core network element is an SMF
  • the second core network element is a UDM.
  • the UDM notifies the SMF of the subscription change of the DNN.
  • the SMF sends the first information to the terminal, and the terminal receives the first information sent by the SMF, where the first information is used to notify the terminal DNN of the subscription change.
  • FIG. 6b is a signaling diagram of notifying a first information of a terminal by using a PDU session release procedure. As shown in Figure 6b, the specific signaling process includes:
  • the UDM determines the subscription change of the DNN.
  • the UDM determines, according to the stored terminal about the session management context or the context information about the PDU session, that the terminal has established a PDU session with the DN identified by the DNN, and the UDM determines that the terminal may notify the terminal of the subscription change information through the SMF. For example, it can be notified through the PDU session release process. Alternatively, the UDM may only notify the SMF and not notify the AMF.
  • the UDM sends a notification to the SMF, where the notification information is used to indicate a subscription change of the DNN.
  • the SMF determines to release the PDU session established by the terminal with the DN identified by the DNN.
  • the reason for triggering the release of the PDU session is the subscription change.
  • the SMF sends the first information to the terminal, where the first information is used to notify the terminal DNN of the subscription change.
  • the first information sent by the SMF to the terminal is sent to the terminal by using the AMF and the access network device. Specifically, after the SMF decides to release the PDU session, the AMF and the access network device send information to the terminal in the PDU session release process, and the information sent in each step carries the indication of the subscription change, and finally the DNN subscription change information is obtained. Notify the terminal.
  • the SMF sends the subscription change information to the AMF through 3a or 3b, and specifically carries information for indicating the subscription change in the Namf_Communication_N1N2 MessageTransfer operation service.
  • the AMF sends the information about the subscription change to the access network device in step 204.
  • the information indicating the subscription change may be carried in the N2 SM Resource Release request.
  • the access network device sends the information about the subscription change to the terminal in step 205, and the information indicating the subscription change may be carried by the AN-specific resource modification.
  • the AMF After receiving the information sent by the SMF to indicate the subscription change, the AMF needs to perform some operations. For example, if the specific type of the contract change is DNN's subscription data deletion, the AMF deletes the DNN data, and if the specific type DDN subscription data is added, the AMF saves the newly added DNN data. If the specific type is DNN not available, AMF sets DNN to be unavailable.
  • the terminal After receiving the first information, the terminal determines the subscription change, and determines the subscription change of the DNN according to the first information. And determining, according to the first information, the specific type of the subscription change of the DNN. If the subscription data of the specific type is DNN is deleted, the terminal deletes the data and the context of the DNN, and if the subscription data of the specific type is DNN is added, the terminal saves the new one. DNN data. If the specific type is DNN is not available, the terminal sets DNN to be unavailable.
  • FIG. 7a is a schematic diagram of a main process of implementing mode 3.
  • the first core network element is an SMF
  • the second core network element is an AMF.
  • the UDM sends notification information for indicating the subscription change to the AMF
  • the AMF receives the notification information sent by the UDM
  • the AMF sends the notification information to the SMF.
  • Notification information indicating the change of the contract.
  • the specific process includes: after the UDM determines the subscription change, the UDM chooses to notify the AMF only of the subscription change, and the UDM does not notify the SMF of the subscription change; after receiving the notification information of the UDM, the AMF notifies the SMF of the subscription change, and after receiving the notification, the SMF sends the notification to the SMF.
  • the terminal sends the first information, and the terminal receives the first information sent by the SMF, where the first information is used to notify the terminal of the subscription change.
  • FIG. 7b is a signaling diagram of notifying a first information of a terminal by using a PDU session release procedure. As shown in Figure 7b, the specific signaling process includes:
  • the UDM determines the subscription change of the DNN.
  • UDM send notification information to the AMF
  • the AMF receives the notification information sent by the UDM, and the notification information is used to indicate the subscription change of the DNN.
  • the AMF After receiving the notification information sent by the UDM, the AMF performs certain operations, such as deleting the subscription data and the context of the DNN, or setting the DNN to be unavailable, or saving the information of the newly added DNN.
  • the AMF sends the notification information to the SMF, and the AMF receives the notification information sent by the UDM, where the notification information is used to indicate the subscription change.
  • the steps S704 to S706 are the same as the steps of S603 to S605, and will not be described again.
  • FIG. 8a is a schematic diagram of a main process of implementation mode 4.
  • the first core network element is an AMF
  • the second core network element is a UDM
  • the system further includes a third core network element
  • the second core network element further sends a notification to the third core network element.
  • the third core network element receives the notification information of the second core network element, where the notification information is used to indicate the subscription change
  • the third core network element is the SMF.
  • the specific process includes: after the UDM determines the contract change, the UDM chooses to notify the AMF and the SMF of the contract change. After receiving the notification information of the UDM, the AMF sends the first information to the terminal, where the first information is used to indicate the subscription change.
  • the terminal receives the first information sent by the AMF, determines the subscription change, deletes the subscription data and context of the DNN, or sets the DNN to be unavailable. In addition, if the terminal has established a PDU session with the DN identified by the DNN, the first information is further used to instruct the terminal to delete the PDU session information.
  • the SMF After receiving the notification information of the UDM, the SMF sends the indication information (which may be referred to as information) to the access network device, where the indication information is used to indicate that the access network device deletes the PDU session context established by the terminal and the DN identified by the DNN.
  • FIG. 8b is a schematic diagram of specific signaling in this application scenario. As shown in Figure 8b, the specific signaling process includes:
  • the UDM determines the subscription change of the DNN.
  • S802a and UDM send notification information to the AMF, and the AMF receives the notification information sent by the AMF, and the notification information is used to indicate the subscription change of the DNN.
  • S802b and UDM send notification information to the SMF, and the SMF receives the notification information sent by the AMF, and the notification information is used to indicate the subscription change of the DNN.
  • the AMF sends the first information to the terminal, where the first information is used to notify the terminal DNN of the subscription change.
  • the terminal After receiving the first information, the terminal determines, according to the first information, a subscription change of the DNN. And determining, according to the first information, the specific type of the subscription change of the DNN. If the subscription data of the specific type is DNN is deleted, the terminal deletes the data and the context of the DNN, and if the subscription data of the specific type is DNN is added, the terminal saves the new one. DNN data. If the specific type is DNN is not available, the terminal sets DNN to be unavailable.
  • the terminal deletes the LADN DNN information after receiving the first information.
  • the SMF decides to release the PDU session established by the terminal with the DN identified by the DNN.
  • the reason for triggering the release of the PDU session is the subscription change.
  • S803c and S803a have no sequential execution order
  • S803c and S803b have no sequential execution order
  • the SMF sends the indication information to the access network device, where the indication is used to delete the PDU session context and release the air interface resource of the PDU session of the access network device side.
  • the SMF does not send N1 SM information to the terminal.
  • the indication information is further used to indicate the access network device: if the terminal is in an idle state, the terminal is not paged.
  • the indication information sent by the SMF to the access network device is sent to the access network device by using the AMF. Specifically, after the SMF decides to release the PDU session, the AMF sends the indication information to the access network device in the PDU session release process.
  • the SMF may send the indication information (which may be referred to as the third information) to the AMF through 3a or 3b, and may specifically carry the indication information in the Namf_Communication_N1N2 MessageTransfer operation service.
  • the AMF sends the indication information (which may be referred to as the fourth information) to the access network device in step 204, and the indication information may be carried in the N2 SM Resource Release request.
  • the access network device After receiving the indication information, the access network device deletes the PDU session context, and releases the air interface resource of the PDU session on the access network device side.
  • FIG. 9a is a schematic diagram of a main process of implementation manner 5.
  • the first core network element is AMF
  • the second core network element is UDM
  • the system further includes a third core network element
  • the second core network element further sends a notification to the third core network element.
  • the third core network element receives the notification information of the second core network element, where the notification information is used to indicate the subscription change of the DNN
  • the third core network element is the SMF.
  • the specific process includes: after the UDM determines the contract change of the DNN, the UDM chooses to notify the AMF and the SMF of the contract change respectively. After receiving the notification information of the UDM, the AMF sends the first information to the terminal when the certain condition is met.
  • the first information is used to indicate the subscription change. Specifically, after receiving the notification information of the UDM, the AMF determines whether the terminal establishes a PDU session with the DN identified by the DNN, and sends the first information to the terminal when the PDU session is not established between the terminal and the DN identified by the DNN. When the PDU session is established between the terminal and the DN identified by the DNN, the AMF does not send the first information to the terminal. The AMF forwards the first information sent by the SMF.
  • the UDM sends a notification to the SMF, so that the SMF notifies the terminal of the change of the subscription; if the terminal and the DNN identify The PDU session is not established between the DNs, and the UDM does not send a notification to the SMF.
  • the AMF needs to send the first information to the terminal to notify the subscription change.
  • the terminal determines the subscription change, deletes the DNN or sets the DNN as unavailable, or saves the information of the newly added DNN.
  • the SMF sends the indication information (which may be referred to as information) to the terminal, and the indication information is used to notify the terminal of the subscription change.
  • FIG. 9b is a schematic diagram of a specific signaling process in the application scenario. As shown in Figure 9b, the specific signaling process includes:
  • UDM determine the subscription change of the DNN.
  • S902a and UDM send notification information to the AMF, and the AMF receives the notification information sent by the UDM, and the notification information is used to indicate the subscription change of the DNN.
  • the AMF After receiving the notification information sent by the UDM, the AMF performs certain operations, such as deleting the subscription data and context of the DNN, or setting the DNN to be unavailable, or saving the information of the newly added DNN.
  • S902b and UDM send notification information to the SMF, and the SMF receives the notification information sent by the AMF, and the notification information is used to indicate the subscription change.
  • the AMF when establishing a PDU session between the terminal and the DN identified by the DNN, the AMF does not send the first information to the terminal according to the notification information of the UDM, and the SMF sends the first information to the terminal according to the notification information of the UDM, where the SMF passes The AMF and the first information sent by the access network device to the terminal, after receiving the first information sent by the SMF, the AMF forwards the first information sent by the SMF, where the first information carries the information of the subscription change of the DNN.
  • the AMF sends the first information to the terminal, where the first information is used to notify the terminal DNN of the subscription change.
  • the SMF decides to release the PDU session established by the terminal with the DN identified by the DNN.
  • the reason for triggering the release of the PDU session is the subscription change.
  • FIG. 10a is a schematic diagram of a main process of implementation manner 6.
  • the first core network element is an AMF
  • the second core network element is a UDM
  • the system further includes a third core network element
  • the second core network element further sends a notification to the third core network element.
  • the third core network element receives the notification information of the second core network element, where the notification information is used to indicate the subscription change of the DNN, and the third core network element is the SMF.
  • the specific process includes: after determining the subscription change of the DNN, the UDM selects to send notification information to both the AMF and the SMF respectively, and the notification information is used to indicate the subscription change of the DNN.
  • the AMF After receiving the notification information of the UDM, the AMF determines whether there is a PDU session established by the terminal and the DN identified by the DNN. If yes, the AMF waits to receive the second information sent by the SMF. In practical applications, if the terminal has established a PDU session with the DN identified by the DNN, the UDM will notify the terminal of the subscription change information through the SMF. Here, if the AMF determines that the PDU session exists, indicating that the UDM will send the notification information to the SMF, the AMF does not immediately indicate the information of the subscription change to the terminal.
  • the second information is PDU session related information, and the PDU session related information refers to information that is exchanged between devices in the PDU session release process.
  • the second information is information sent by the SMF to the terminal and transparently transmitted through the AMF.
  • the AMF After receiving the second information sent by the SMF, the AMF sends the first information to the terminal.
  • the AMF sends the second information and the first information to the terminal, or carries the indication of the subscription change in one of the first information and the second information, and sends a message carrying the subscription change indication to the terminal.
  • the terminal After receiving the first information and/or the second information sent by the AMF, the terminal deletes the PDU session information and performs other operations of the subscription change, for example, deleting the DNN information, and setting the DNN to be unavailable.
  • the AMF can only notify the terminal of the subscription change by sending the information to the terminal only once, which saves the network side signaling overhead and the air interface signaling overhead.
  • the network side is prevented from initiating at least two pagings, thereby further saving signaling overhead.
  • the signaling process in a specific application scenario includes:
  • UDM determine the subscription change of the DNN.
  • UDM send a notification to the AMF
  • the SMF receives the notification information sent by the UDM, and the notification information is used to indicate the subscription change of the DNN.
  • the UDM sends a notification to the SMF, and the AMF receives the notification information sent by the UDM, and the notification information is used to indicate the subscription change of the DNN.
  • the S1003a After receiving the notification information sent by the UDM, the S1003a waits to receive the second information sent by the SMF when the terminal establishes a PDU session with the DN identified by the DNN, and the second information may be PDU session related information.
  • the AMF after receiving the notification information sent by the UDM, the AMF performs certain operations, such as deleting the subscription data and context of the DNN, or setting the DNN to be unavailable, or saving the information of the newly added DNN.
  • the S1003b and the SMF After receiving the notification information sent by the UDM, the S1003b and the SMF decide to release the PDU session established by the terminal and the DN identified by the DNN.
  • the SMF sends the second information to the AMF, where the AMF receives the second information sent by the SMF, where the second information includes the information about the subscription change.
  • the SMF sends the second information to the AMF through 3a or 3b, and specifically carries the second information in the Namf_Communication_N1N2 MessageTransfer operation service.
  • the AMF After receiving the second information sent by the SMF, the AMF sends the first information to the terminal. Optionally, at least one of the first information or the second information is sent. Both the first information and the second information are used to indicate a contract change. It is also considered that the second information is equivalent to the first information, that is, the AMF transmitting the first information to the terminal is equivalent to the AMF transmitting the second information to the terminal.
  • the AMF sends the first information and the second information to the access network device in step 204, where the first information and/or the second information may be carried in the N2 SM Resource Release request. information.
  • the access network device sends the first information and/or the second information to the terminal by using the step 205, and the first information and/or the second information may be carried by the AN-specific resource modification.
  • the AMF stores the DNN and the PDU session ID, and the AMF determines whether the second information is related to the PDU session when receiving the second information. information.
  • the SMF may trigger multiple notifications after receiving the notification information sent by the UDM.
  • the PDU session release process that is, the SMF may send multiple second information to the AMF.
  • the AMF after receiving the notification information sent by the UDM, the AMF starts a timer and keeps silent before the timer expires.
  • the silent definition is that the AMF does not send the subscription change information to the terminal, and waits for the SMF to be sent.
  • the second information when the timer expires, the first information may be sent to the terminal regardless of whether the second information sent by the SMF is received.
  • the predetermined value is the agreement or the UDM notifies the AMF.
  • the AMF determines that all the second information for releasing the PDU session has been received, the first information and/or the at least one second information are sent to the terminal at one time.
  • the signaling waste caused by sending the PDU session related information in each release PDU process is avoided, the subscription change information sent by the AMF to the terminal, the subscription change information sent by the SMF to the terminal, and the SMF sending to the terminal are mostly sent.
  • the secondary PDU session related information is sent to the terminal at one time, which helps to save the air interface signaling overhead. If the indication of the subscription change is carried in the PDU session related information, the system resources are further saved.
  • the terminal After receiving the first information, the terminal determines the subscription change, deletes the data and the context of the DNN, or sets the DNN as unavailable, or saves the information of the newly added DNN.
  • the terminal deletes the LADN DNN information after receiving the first information.
  • Figure 11a shows a schematic diagram of the main flow of implementation seventh.
  • the first core network element is an AMF entity
  • the second core network element is a UDM entity.
  • the UDM notifies the AMF of the subscription change.
  • the AMF sends notification information for indicating the subscription change to the PCF.
  • the PCF updates the UE Route Selection Policy (URSP) and sends the updated URSP to the AMF.
  • URSP UE Route Selection Policy
  • the AMF sends the first information to the terminal, and the terminal receives the first information sent by the AMF, where the first information is used to notify the terminal of the subscription change, and the updated URSP.
  • URSP UE Route Selection Policy
  • FIG. 11 is a schematic diagram of a signaling interaction process of implementation manner 7.
  • the first core network element is an AMF entity
  • the second core network element is a UDM entity. As shown in Figure 11a:
  • UDM determines the contract change.
  • the UDM sends a notification to the AMF, which is used to indicate a subscription change to the AMF.
  • the AMF performs certain operations according to the received notification information, such as deleting the subscription data and context of the DNN, or setting the DNN to be unavailable, or saving the information of the newly added DNN.
  • the S1104 and the AMF After receiving the notification, the S1104 and the AMF send notification information for indicating the subscription change to the PCF, and the PCF receives the notification information sent by the AMF.
  • the S1105 and the PCF After receiving the notification information sent by the AMF, the S1105 and the PCF update the URSP.
  • S1106 The PCF sends the updated URSP to the AMF, and the AMF receives the URSP sent by the PCF.
  • the S1107 After receiving the URSP sent by the PCF, the S1107 sends the first information to the terminal, where the first information is used to notify the terminal of the subscription change, and the terminal is instructed to update the URSP.
  • the terminal After receiving the first information, the terminal determines the subscription change, and determines the URSP update. The terminal determines the specific type of the subscription change of the DNN according to the first information. If the subscription data of the specific type is DNN is deleted, the terminal deletes the data and the context of the DNN. If the subscription data of the specific type DNN is added, the terminal saves the newly added DNN. data. If the specific type is DNN is not available, the terminal sets DNN to be unavailable. The terminal updates the URSP according to the first information.
  • the present application further provides a communication device 1200, which can be applied to the communication system shown in FIG. 1 for implementing the communication method shown in FIG. .
  • the communication device 1200 is a first core network element.
  • the communication device 1200 includes: a receiving unit 1201, a sending unit 1202, where:
  • the receiving unit 1201 is configured to receive notification information of the second core network element, where the notification information is used to indicate a subscription change.
  • the sending unit 1202 is configured to send, to the terminal, first information, where the first information is used to notify the terminal of the subscription change.
  • the core network element 1200 provided by the embodiment of the present invention transmits the information for indicating the subscription change to the terminal through the core network element 1200, and can achieve the purpose of notifying the terminal of the subscription change.
  • the present application further provides an AMF 1300, which can be applied to the communication system shown in FIG. 1 for implementing the functions performed by the AMF in any of the foregoing implementation manners.
  • the AMF 1300 can perform all functions performed by the core network element 1200.
  • the second core network element can be a UDM.
  • the AMF 1300 includes a receiving unit 1301 and a transmitting unit 1302.
  • the receiving unit 1301 performs the steps performed by the receiving unit 1201 in FIG. 12, and the transmitting unit 1302 performs the steps performed by the transmitting unit 1202 in FIG.
  • receiving unit 1301 and the sending unit 1302 in the AMF 1300 can also implement other operations or functions of the AMF in any implementation manner of the foregoing embodiments, and details are not described herein again.
  • the present application further provides an SMF 1400, which can be applied to the communication system shown in FIG. 1 for implementing the functions performed by the SMF in any of the foregoing implementation manners.
  • the SMF 1400 can perform all functions performed by the core network element 1200.
  • the second core network element may be a UDM or an AMF.
  • the SMF 1400 includes a receiving unit 1401 and a transmitting unit 1402.
  • the receiving unit 1401 executes the receiving unit 1201 to execute the steps in FIG. 12, and the transmitting unit 1402 performs the steps performed by the transmitting unit 1202 in FIG.
  • receiving unit 1401 and the sending unit 1402 in the SMF 1400 can also implement other operations or functions of the SMF in any implementation manner of the foregoing embodiments, and details are not described herein again.
  • the present application further provides a PCF 1500, which can be applied to the communication system shown in FIG. 1 for implementing the functions performed by the PCF in Embodiment 7 of the foregoing embodiment.
  • the PCF 1500 is capable of performing all functions performed by the core network element 1200.
  • the second core network element may be an AMF.
  • the PCF 1500 includes a receiving unit 1501, a processing unit 1502, and a transmitting unit 1503.
  • the receiving unit 1501 executes the receiving unit 1201 to execute the steps in FIG. 12, and the transmitting unit 1502 executes the transmitting unit 1202 to perform the steps in FIG.
  • the receiving unit 1501 is configured to receive notification information of the subscription change sent by the AMF.
  • the processing unit 1502 is configured to update the URSP according to the notification information.
  • the sending unit 1502 is configured to send the updated URSP to the terminal by using the AMF and the access network device.
  • the receiving unit 1501, the processing unit 1502, and the sending unit 1503 in the PCF 1500 can also implement other operations or functions of the PCF in the seventh embodiment of the foregoing embodiment, and details are not described herein again.
  • the present application further provides a communication device 1600, which can be applied to the communication system shown in FIG. 1 for implementing the functions performed by the terminal in any of the implementation manners in the foregoing embodiments.
  • the communication device 1600 includes a receiving unit 1601 and a processing unit 1602.
  • the receiving unit 1601 is configured to receive first information sent by a core network element, where the core network element is an access and mobility management function AMF, or a session management function SMF, where the first information is used to indicate a data network name DNN.
  • the signing change; the processing unit 1602 deletes the data and context of the DNN according to the first information, or adds DNN data.
  • receiving unit 1601 and the processing unit 1602 in the communication device 1600 can also implement other operations or functions of the terminal in any implementation manner of the foregoing embodiments, and details are not described herein again.
  • each functional unit in each embodiment of the present application may be used. It can be integrated in one processing unit, or it can exist physically alone, or two or more units can be integrated in one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
  • a computer readable storage medium A number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) or a processor to perform all or part of the steps of the methods described in various embodiments of the present application.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program code. .
  • the present application further provides a core network element 1700, which can be applied to the communication system shown in FIG. The communication method shown.
  • the core network element 1700 is recorded as the first core network element.
  • the core network element 1700 includes a transceiver 1701 and a processor 1702, and optionally a memory 1703. among them:
  • the transceiver 1701 is configured to receive and transmit data to implement communication with other devices in the communication system.
  • the processor 1702 is configured to execute a set of programs. When the program is executed, the execution is caused by the processor 1702 to implement the communication method provided by the embodiment shown in FIG. 4. For details, refer to the description in the foregoing embodiment. Narration.
  • the memory 1703 is configured to store a program executed by the processor 1702.
  • the program can include program code, the program code including computer operating instructions.
  • the memory 1703 may include a random access memory (RAM), and may also include a non-volatile memory such as at least one disk storage.
  • the processor 1702 executes the program stored in the memory 1703 to implement the above functions, thereby implementing the communication method provided by the above embodiments.
  • the present application further provides an AMF 1800, which can be applied to the communication system shown in FIG. 1 for implementing the functions performed by the AMF in any of the foregoing implementation manners.
  • the AMF 1800 includes a transceiver 1801 and a processor 1802, and optionally a memory 1803. among them:
  • the transceiver 1801 is configured to receive and transmit data to implement communication with other devices in the communication system.
  • the processor 1802 is configured to execute a set of programs. When the program is executed, the execution is performed by the processor 1802 to implement the functions performed by the AMF in any one of the foregoing implementation manners. For details, refer to the description in the foregoing embodiment. I won't go into details here.
  • the memory 1803 is configured to store a program executed by the processor 1802.
  • the program can include program code, the program code including computer operating instructions.
  • the memory 1803 may include a random access memory (RAM), and may also include a non-volatile memory such as at least one disk storage.
  • the processor 1802 executes the program stored in the memory 1803 to implement the above functions, thereby implementing the method of AMF execution in any of the above embodiments.
  • the present application further provides an SMF 1900, which can be applied to the communication system shown in FIG. 1 for implementing the functions performed by the SMF in any of the foregoing implementation manners.
  • the SMF 1900 includes a transceiver 1901 and a processor 1902, optionally including a memory 1903. among them:
  • the transceiver 1901 is configured to receive and transmit data to implement communication with other devices in the communication system.
  • the processor 1902 is configured to execute a set of programs. When the program is executed, the execution is performed by the processor 1902 to implement the functions performed by the SMF in any one of the foregoing implementation manners. For details, refer to the description in the foregoing embodiment. I won't go into details here.
  • the memory 1903 is configured to store a program executed by the processor 1902.
  • the program can include program code, the program code including computer operating instructions.
  • the memory 1903 may include a random access memory (RAM), and may also include a non-volatile memory such as at least one disk storage.
  • the processor 1902 executes the program stored in the memory 1903 to implement the above functions, thereby implementing the method of SMF execution in any of the above embodiments.
  • the present application further provides a PCF2000, which can be applied to the communication system shown in FIG. 1 for implementing the functions performed by the PCF in the implementation manner 7 in the foregoing embodiment.
  • the PCF 2000 includes a transceiver 2001 and a processor 2002, and optionally a memory 2003. among them:
  • the transceiver 2001 is configured to receive and transmit data to implement communication with other devices in the communication system.
  • the processor 2002 is configured to execute a set of programs. When the program is executed, the processor is configured to implement the functions performed by the PCF in the implementation manner in the foregoing embodiment. For details, refer to the description in the foregoing embodiment. Let me repeat.
  • the memory 2003 is configured to store a program executed by the processor 2002.
  • the program can include program code, the program code including computer operating instructions.
  • the memory 2003 may include a random access memory (RAM), and may also include a non-volatile memory such as at least one disk storage.
  • the processor 2002 executes the program stored in the memory 2003 to implement the above functions, thereby implementing the method performed by the PCF in the seventh embodiment of the above embodiment.
  • the present application further provides a communication device 2100, which can be applied to the communication system shown in FIG. 1 for implementing the functions performed by the terminal in the foregoing embodiment.
  • the communication device 2100 includes a transceiver 2101 and a processor 2102, and optionally a memory 2103. among them:
  • the transceiver 2101 is configured to receive and transmit data to implement communication with other devices in the communication system.
  • the processor 2102 is configured to execute a set of programs. When the program is executed, the execution is performed by the processor 2102. For details, refer to the description in the foregoing embodiment, and details are not described herein.
  • the memory 2103 is configured to store a program executed by the processor 2102.
  • the program can include program code, the program code including computer operating instructions.
  • the memory 2103 may include a random access memory (RAM), and may also include a non-volatile memory such as at least one disk storage.
  • the processor 2102 executes the program stored in the memory 2103 to implement the above functions, thereby implementing the method executed by the terminal in the above embodiment.
  • the embodiment of the present application provides a computer storage medium, which stores a computer program, and the computer program includes a method for performing the communication method described in FIG. 4 and any implementation manner of the foregoing embodiments.
  • the embodiment of the present application provides a computer program product comprising instructions, which when executed on a computer, causes the computer to perform the communication method described in FIG. 4 and the method provided by any one of the foregoing embodiments.
  • embodiments of the present application can be provided as a method, system, or computer program product.
  • the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment in combination of software and hardware.
  • the application can take the form of a computer program product embodied on one or more computer usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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Abstract

一种通信方法、装置及系统，用以实现将DNN的签约变化的信息通知给终端。该方法为：第一核心网网元接收第二核心网网元的通知信息，所述通知信息用于指示数据网络名称DNN的签约变化；所述第一核心网网元向终端发送第一信息，所述第一信息用于通知所述终端所述DNN的签约变化。

Description

一种通信方法、装置及系统
本申请要求在2017年11月21日提交中国专利局、申请号为201711168911.5、发明名称为“一种通信方法、装置及系统”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
本申请实施例涉及通信技术领域，尤其涉及一种通信方法、装置及系统。
背景技术
第五代(5th generation，5G)通信系统的系统架构分为接入网和核心网两部分。接入网用于实现无线接入有关的功能。核心网中包括多个网元，其中，统一数据管理(unified data management，UDM)实体用于管理终端的签约数据和与终端相关的注册信息。UDM中存储数据网络(data network，DN)的标识(DN number，DNN)，DNN用于标识不同的DN。不同使用终端的用户与运营商之间的签约对应的签约数据可以用DNN和用户ID来标识。核心网中的接入和移动性管理功能(access and mobility management function，AMF)实体用于负责终端的注册、移动性管理、跟踪区更新流程等。在终端建立会话流程中，SMF实体从UDM实体获取终端的签约数据。具体地，SMF实体向UDM实体发送签约数据请求消息，UDM实体向SMF实体返回携带有签约数据的签约数据响应消息。然后，通信系统执行会话鉴权，SMF为终端选择策略控制功能(policy control function，PCF)实体，并从PCF实体获取策略和计费控制(policy and charging control，PCC)规则。SMF实体根据终端的位置信息、签约数据和SSC mode(s)等信息，为终端选择合适的UPF实体，并针对会话为终端分配IP地址。
DNN的签约变化是指DNN所标识的签约发生变化，当DNN的签约变化时，若终端已经与该DNN标识的DN建立会话，则需要释放会话，若终端未与该DNN标识的DN建立会话，则终端不能与该DNN标识的DN建立会话。
如何将终端与DNN的签约变化的信息通知给终端是需要解决的技术问题。
发明内容
本申请实施例提供一种通信方法、装置及系统，用以实现将终端与DNN的签约变化的信息通知给终端。
本申请实施例提供的具体技术方案如下：
第一方面，提供一种通信方法，该通信方法可以包括以下步骤：第一核心网网元接收第二核心网网元的通知信息，所述通知信息用于指示DNN的签约变化；所述第一核心网网元在接收到通知信息后，向终端发送第一信息，所述第一信息用于通知所述终端所述DNN的签约变化。这样，通过核心网网元向终端发送携带DNN的签约变化的信息，能够达到通知终端DNN的签约变化的目的。
在一个可能的设计中，所述DNN的签约变化为DNN的签约数据删除，或DNN的签约数据新增。
在一个可能的设计中，所述DNN的签约变化可以理解为DNN的签约数据变化。
可选的，DNN的签约变化还可以为DNN不可用。
在一个可能的设计中，所述DNN为局部区域数据网络LADN DNN，所述第一核心网网元可以通过隐式携带信息的方式向终端通知LADN DNN的签约变化，具体的，可以通过以下方式的任意一种：所述第一信息中携带所述LADN DNN、且不携带LADN的服务区域；或者，所述第一信息中携带所述LADN DNN和LADN的服务区域列表、且所述LADN的服务区域列表为空；或者，所述第一信息中携带所述LADN DNN和LADN的服务区域、且所述LADN的服务区域大小为0；在这种应用场景下，所述第一信息还用于指示所述终端将所述LADN DNN置为不可用或删除所述LADN DNN或删除LADN信息。这样，通过隐式携带信息的方式通知终端，能够省去在第一信息中携带指示信息，有助于节省信令开销。
在一个可能的设计中，若所述第一核心网网元为接入和移动管理功能AMF，则所述第一核心网网元向所述终端发送第一信息可以通过以下方式实现：所述第一核心网网元在满足条件时，向所述终端发送第一信息；其中，所述条件为：所述终端与所述DNN所标识的数据网络DN未建立分组数据单元PDU会话。也就是说，若所述终端与所述DNN所标识的DN已建立PDU会话，则AMF不会根据UDM的通知信息向终端发送第一信息，SMF会根据UDM的通知信息向终端发送第一信息，其中，SMF通过AMF、接入网设备向终端发送的第一信息，AMF会在接收到SMF发送的第一信息后，转发SMF发送的第一信息，该第一信息中携带DNN的签约变化的信息。这样，在UDM分别向AMF和SMF发送通知信息的情况下，AMF向终端只发送一次信息，就能够实现向终端通知该签约变化，节省了网络侧信令开销和空口信令开销。且对于终端处于空闲态的场景，避免了网络侧发起至少两次寻呼，从而进一步节省了信令开销。
在一个可能的设计中，若所述第一核心网网元为AMF，则所述第一核心网网元向所述终端发送第一信息，可以通过以下方式实现：所述AMF在接收会话管理功能SMF发送的第二信息后，向所述终端发送第一信息。这样，在UDM分别向AMF和SMF发送通知信息的情况下，AMF向终端只发送一次信息，就能够实现向终端通知该签约变化，节省了网络侧信令开销和空口信令开销。且对于终端处于空闲态的场景，避免了网络侧发起至少两次寻呼，从而进一步节省了信令开销。
在一个可能的设计中，若所述第一核心网网元为AMF，所述第二核心网网元为统一数据管理UDM，则所述第一核心网网元向所述终端发送第一信息，可以通过以下方式实现：所述AMF确定所述终端与所述DNN所标识的DN已建立PDU会话，启动定时器；所述AMF在所述定时器到期时，向所述终端发送所述第一信息；或者，所述AMF在所述定时器到期之前，确定接收到SMF发送的第二信息的数目达到预定值，则向所述终端发送所述第一信息。可选的，在所述定时器到期前，AMF等待接收SMF发送的第二信息。这样，在UDM分别向AMF和SMF发送通知信息的情况下，AMF向终端只发送一次信息，就能够实现向终端通知该签约变化，节省了网络侧信令开销和空口信令开销。且对于终端处于空闲态的场景，避免了网络侧发起至少两次寻呼，从而进一步节省了信令开销。并且，避免了每一个释放PDU流程发送一次PDU会话相关信息而造成的信令浪费，将AMF向终端发送的签约变化的信息、SMF向终端发送的签约变化的信息、和SMF向终端发送的多次PDU会话相关信息一次性发送给终端，有助于节省空口信令开销，若将签约变化的指 示携带在PDU会话相关信息中，进一步节省系统资源。
在一个可能的设计中，所述AMF实体在所述定时器到期时，若已接收到所述SMF实体发送的第二信息，根据所述第二信息，向所述终端发送第一信息，所述第一信息还用于指示所述终端删除PDU会话信息。这样，AMF向终端只发送一次信息，就能够实现向终端通知该签约变化，节省了网络侧信令开销和空口信令开销。
在一个可能的设计中，所述第二信息为PDU会话相关信息，所述第一信息用于指示所述终端删除PDU会话信息。这样，能够在PDU会话释放流程中通知终端DNN的签约变化的信息，节省系统资源。
在一个可能的设计中，若所述第一核心网网元为AMF，所述第二核心网网元为UDM，所述第一信息还用于指示所述终端删除PDU会话信息；所述方法还可以包括以下步骤：所述第一核心网网元接收SMF发送的第三信息，所述第三信息用于指示接入网设备删除所述终端与DNN所标识的数据网络DN建立的PDU会话的上下文；所述第一核心网网元根据所述第三信息，向所述接入网设备发送第四信息，所述第四信息用于指示所述接入网设备删除PDU会话上下文。这样，在UDM分别向AMF和SMF均发送DNN签约变化的通知信息时，SMF侧只将DNN签约变化的信息通知到接入网设备，而不向终端通知，节省了接入网设备到终端的空口信令开销。
在一个可能的设计中，所述第三信息还用于向所述第一核心网网元指示若所述终端处于空闲态，不对所述终端进行寻呼。
在一个可能的设计中，若所述第一核心网网元为AMF，所述第二核心网网元为UDM，则所述方法还包括以下步骤：所述第一核心网网元向策略控制功能PCF通知：所述签约变化，用于指示所述PCF更新用户设备UE路由选择策略URSP；所述第一信息中携带更新后的URSP，用于指示所述终端更新URSP。这样，在DNN的签约变化时，能够将更新的URSP通知给终端。
在一个可能的设计中，若所述第一核心网网元为SMF，所述第二核心网元可以为UDM或AMF。
第二方面，提供了一种通信方法，该方法可以包括以下步骤：会话管理功能SMF接收通知信息，所述通知信息用于指示数据网络名称DNN的签约变化；所述SMF向接入网设备发送信息，所述信息用于指示所述接入网设备删除所述终端与DNN所标识的数据网络DN建立的分组数据单元PDU会话的上下文。这样，在UDM分别向AMF和SMF均发送DNN签约变化的通知信息时，由AMF向终端通知DNN的签约变化，而SMF侧只将DNN签约变化的信息通知到接入网设备，而不向终端通知，节省了接入网设备到终端的空口信令开销。
在一个可能的设计中，所述SMF还会指示接入和移动管理功能AMF：若所述终端处于空闲态，不对所述终端进行寻呼。
第三方面，提供了一种通信方法，该方法包括以下步骤：统一数据管理UDM确定数据网络名称DNN的签约变化；所述UDM向会话管理功能SMF发送通知信息，和/或，所述UDM向接入和移动管理功能AMF发送通知信息；其中，所述通知信息用于指示数据网络名称DNN的签约变化。这样，通过核心网网元向终端发送携带DNN的签约变化的信息，能够达到通知终端DNN的签约变化的目的。当UDM选择其中一个核心网网元通知签约变化，通过选择的核心网网元(如SMF或AMF)，将签约变化的信息通知给终端，能 够有助于减少信令的开销，避免资源浪费。
在一个可能的设计中，当终端与所述DNN所标识的数据网络DN已建立分组数据单元PDU会话时，所述UDM向所述SMF发送通知信息，或者，所述UDM分别向所述SMF和所述AMF均发送通知信息；当终端与所述DNN所标识的DN未建立PDU会话时，所述UDM仅向所述AMF发送通知信息。
第四方面，提供一种通信方法，该方法包括以下步骤：终端接收核心网网元发送的第一信息，所述核心网网元为接入和移动管理功能AMF、或会话管理功能SMF，所述第一信息用于指示数据网络名称DNN的签约变化；所述终端根据所述第一信息，删除DNN的数据和上下文，或新增DNN数据。这样，终端通过接收核心网网元发送的携带DNN的签约变化的信息，能够达到通知终端DNN的签约变化的目的。
可选的，所述核心网网元为PCF，所述终端根据第一信息更新用户设备UE路由选择策略URSP。
第五方面，提供一种通信装置，该装置具有实现上述第一方面和第一方面的任一种可能的设计中第一核心网网元行为的功能。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模块。
在一个可能的设计中，该装置的结构包括收发器和处理器，其中，所述处理器用于调用一组程序，以执行如上述第一方面和第一方面的任一种可能的设计中所述的方法。
可选的，该装置还包括存储器，用于存储所述处理器执行的程序。
第六方面，提供一种AMF，该AMF具有实现上述任一方面和任一方面的任一种可能的设计中AMF行为的功能。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模块。
在一个可能的设计中，该装置的结构包括收发器和处理器，其中，所述处理器用于调用一组程序，以执行如上述第一方面和第一方面的任一种可能的设计中所述的方法。
可选的，该装置还包括存储器，用于存储所述处理器执行的程序。
第七方面，提供一种SMF，该SMF具有实现上述任一方面和任一方面的任一种可能的设计中SMF行为的功能。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模块。
在一个可能的设计中，该装置的结构包括收发器和处理器，其中，所述处理器用于调用一组程序，以执行如上述第一方面和第一方面的任一种可能的设计中所述的方法。
可选的，该装置还包括存储器，用于存储所述处理器执行的程序。
第八方面，提供一种UDM，该UDM具有实现上述任一方面和任一方面的任一种可能的设计中UDM行为的功能。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模块。
在一个可能的设计中，该装置的结构包括收发器和处理器，其中，所述处理器用于调用一组程序，以执行如上述第一方面和第一方面的任一种可能的设计中所述的方法。
可选的，该装置还包括存储器，用于存储所述处理器执行的程序。
第九方面，提供一种PCF，该PCF具有实现上述任一方面和任一方面的任一种可能的设计中PCF行为的功能。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模块。
在一个可能的设计中，该装置的结构包括收发器和处理器，其中，所述处理器用于调 用一组程序，以执行如上述第一方面和第一方面的任一种可能的设计中所述的方法。
可选的，该装置还包括存储器，用于存储所述处理器执行的程序。
第十方面，提供一种通信装置，该装置具有实现上述第一方面和第一方面的任一种可能的设计中终端行为的功能。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模块。
在一个可能的设计中，该装置的结构包括收发器和处理器，其中，所述处理器用于调用一组程序，以执行如上述第一方面和第一方面的任一种可能的设计中所述的方法。
可选的，该装置还包括存储器，用于存储所述处理器执行的程序。
第十一方面，提供一种通信系统，该通信系统包括统一数据管理UDM，用于向接入和移动管理功能AMF和/或会话管理功能SMF发送通知信息，所述通知信息用于指示数据网络名称DNN的签约变化；所述AMF或所述SMF，用于接收所述UDM的通知信息，向所述终端发送第一信息，所述第一信息用于通知所述终端所述DNN的签约变化；所述终端，用于接收所述AMF和/或所述SMF发送的第一信息，根据所述第一信息，删除DNN的数据和上下文，或新增DNN数据。
在一个可能的设计中，该通信系统还包括PCF，该PCF用于执行上述任一方面和任一方面的任一种可能的设计中UDM执行的功能。
在一个可能的设计中，该通信系统中的UDM用于执行上述任一方面和任一方面的任一种可能的设计中UDM执行的功能，该通信系统中的SMF用于执行上述任一方面和任一方面的任一种可能的设计中SMF执行的功能，该通信系统中的终端用于执行上述任一方面和任一方面的任一种可能的设计中终端执行的功能。
第十二方面，提供了一种计算机存储介质，存储有计算机程序，该计算机程序包括用于执行上述各方面所述的方法的指令。
第十三方面，提供了一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机执行上述各方面所述的方法。
附图说明
图1为本申请实施例中通信系统架构示意图；
图2为本申请实施例中PDU会话释放流程示意图；
图3为本申请实施例中LADN应用场景示意图；
图4为本申请实施例中通信方法流程示意图；
图5a为本申请实施例中实现方式一的主要流程的示意图；
图5b为本申请实施例中实现方式一信令交互流程的示意图；
图6a为本申请实施例中实现方式二的主要流程的示意图；
图6b为本申请实施例中实现方式二信令交互流程的示意图；
图7a为本申请实施例中实现方式三的主要流程的示意图；
图7b为本申请实施例中实现方式三信令交互流程的示意图；
图8a为本申请实施例中实现方式四的主要流程的示意图；
图8b为本申请实施例中实现方式四信令交互流程的示意图；
图9a为本申请实施例中实现方式五的主要流程的示意图；
图9b为本申请实施例中实现方式五信令交互流程的示意图；
图10a为本申请实施例中实现方式六的主要流程的示意图；
图10b为本申请实施例中实现方式六信令交互流程的示意图；
图11a为本申请实施例中实现方式七的主要流程的示意图；
图11b为本申请实施例中实现方式七信令交互流程的示意图；
图12为本申请实施例中通信装置结构示意图之一；
图13为本申请实施例中AMF结构示意图；
图14为本申请实施例中SMF结构示意图；
图15为本申请实施例中PCF结构示意图；
图16为本申请实施例中通信装置结构示意图之二；
图17为本申请实施例中核心网网元结构示意图；
图18为本申请实施例中AMF结构示意图；
图19为本申请实施例中SMF结构示意图；
图20为本申请实施例中PCF结构示意图；
图21为本申请实施例中通信装置结构示意图之三。
具体实施方式
本申请提供一种通信方法、装置及系统，用于实现将DNN的签约变化的信息通知给终端。其中，方法和设备是基于同一发明构思的，由于方法及设备解决问题的原理相似，因此装置与方法的实施可以相互参见，重复之处不再赘述。
需要说明的是，本申请实施例的描述中，“和/或”，描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。字符“/”一般表示前后关联对象是一种“或”的关系。本申请中所涉及的至少一个是指一个或多个；多个，是指两个或两个以上。另外，需要理解的是，在本申请的描述中，“第一”、“第二”等词汇，仅用于区分描述的目的，而不能理解为指示或暗示相对重要性，也不能理解为指示或暗示顺序。
下面结合附图对本申请实施例做进行具体说明。
图1示出了本申请实施例提供的通信方法适用的一种可选的通信系统的架构，参阅图1所示，所述通信系统中包括：终端101、接入网(access network，AN)设备102、接入和移动性管理功能(access and mobility management function，AMF)103、会话管理功能(session management function，SMF)104、PCF105、应用功能(application function，AF)106，用户面功能(user plane function，UPF)107、数据网络(data network，DN)108、统一数据管理(unified data management，UDM)110、和鉴权服务器功能(authentication server function，AUSF)110。
其中，终端101，又称之为用户设备(user equipment，UE)、移动台(mobile station，MS)、移动终端(mobile terminal，MT)等，是一种向用户提供语音和/或数据连通性的设备。例如，终端设备包括具有无线连接功能的手持式设备、车载设备等。目前，终端设备可以是：手机(mobile phone)、平板电脑、笔记本电脑、掌上电脑、移动互联网设备(mobile internet device，MID)、可穿戴设备，虚拟现实(virtual reality，VR)设备、增强现实(augmented reality，AR)设备、工业控制(industrial control)中的无线终端、无人驾驶(self driving) 中的无线终端、远程手术(remote medical surgery)中的无线终端、智能电网(smart grid)中的无线终端、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端，或智慧家庭(smart home)中的无线终端等。下面将结合附图，对本申请实施例进行详细描述。
AN设备102是所述通信系统中将终端101接入到无线网络的设备。所述AN设备为无线接入网中的节点，又可以称为基站，还可以称为无线接入网(radio access network，RAN)节点(或设备)。目前，一些AN设备的举例为：gNB、传输接收点(transmission reception point，TRP)、演进型节点B(evolved Node B，eNB)、无线网络控制器(radio network controller，RNC)、节点B(Node B，NB)、基站控制器(base station controller，BSC)、基站收发台(base transceiver station,BTS)、家庭基站(例如，home evolved NodeB，或home Node B，HNB)、基带单元(base band unit，BBU)，或无线保真(wireless fidelity，Wifi)接入点(access point，AP)等。
DN108可以是因特网(Internet)、IP多媒体业务(IP Multi-media Service，IMS)网络、区域网络(即本地网络，例如移动边缘计算(mobile edge computing，MEC)网络)等。DN中包括应用服务器，所述应用服务器通过与所述终端101进行数据传输，为所述终端101提供业务服务。
核心网用于将终端101接入可以实现终端101的业务的DN108。下面对所述核心网中各网元功能进行描述。
AMF103，可用于负责终端101的注册、移动性管理、跟踪区更新流程、可达性检测、SMF104的选择、移动状态转换管理等。
SMF104，可用于负责终端101的会话管理(包括会话的建立、修改和释放)，UPF107的选择和重选、终端101的IP地址分配、QoS控制等。
PCF105，可用于负责策略控制决策、提供基于业务数据流和应用检测、门控、QoS和基于流的计费控制等功能。
AF106，主要功能是与第三代合作伙伴计划(the 3rd generation partnership project，3GPP核心网交互来提供服务，来影响业务流路由、接入网能力开放、策略控制等。
UDM109，可用于管理终端设备101的签约数据、与终端设备101相关的注册信息。
AUSF110，主要功能是提供鉴权服务。
UPF107，可用于转发终端101的用户面数据。主要功能是数据包路由和转发、移动性锚点、上行分类器来支持路由业务流到数据网络、分支点来支持多归属分组数据单元(Packet Data Unit，PDU)会话等。
DN108，例如运营商服务，互联网接入或者第三方服务。
以上各个网元功能也可以称为功能实体、或网元，例如，AMF103称为AMF实体103。网元功能既可以是在专用硬件上实现的网络元件，也可以是在专用硬件上运行的软件实例，或者是在适当平台上虚拟化功能的实例，例如，上述虚拟化平台可以为云平台。
需要说明的是，本申请实施例并不限定核心网中各个网元功能的分布形式，可选的，核心网中的网元功能也可以包含上述任意多种网元功能融合后形成的其他功能实体，例如，具有会话管理和策略控制两种功能的功能实体，或者具有会话管理、接入与移动性管理和策略控制三种功能的功能实体等。
需要说明的是，图1所示的通信系统并不构成本申请实施例能够适用的通信系统的限 定。图1所示的通信系统架构为非漫游的5G系统架构，可选的，本申请实施例的方法还适用于漫游的5G系统架构、以及适用于未来的各种通信网络。
基于图1所示的通信系统的架构，以下对本申请实施例的部分用语进行解释说明，以便于本领域技术人员理解。
1)、PDU会话，是终端和DN之间的连接，提供PDU连接性服务。连接的类型可以是互联网协议(Internet Protocol，IP)，以太网或者非结构数据。核心网支持的PDU连接服务，是指提供终端和由DN的标识(DN number，DNN)确定的DN之间PDU交换的服务。终端可以建立多个PDU会话，来连接到相同的DN或者不同的DN。终端可以建立由不同的UPF提供服务的PDU会话，来连接到相同的DN。PDU会话的激活态是指PDU会话的用户面资源已经建立起来的状态，终端和DN之间建立了端到端的连接，可以传递数据；PDU会话的去激活态是指PDU会话仅保留部分用户面资源，UE和(R)AN之间的用户面空口资源，以及(R)AN和UPF之间的连接都没有建立起来，UE和DN之间不能传递数据。SMF和UPF中仍保留PDU会话的部分信息。
2)、PDU会话释放流程。一种可选的PDU会话释放流程如图2所述。
201、SMF接收到其他网络设备的请求，会决定释放一个PDU会话。例如，接收到DN的请求，或者接收到UDM的请求，或者接收到在线计费系统(online charging system，OCS)的请求。在该请求中包含触发PDU会话释放的条件或原因，例如，终端与DNN的签约变化。
202、SMF释放分配给PDU会话的IP地址/前缀和相应的用户面资源。
具体的，通过2a和2b两个步骤完成。
2a.SMF发送N4会话释放请求(包括N4会话标识(Identification，ID))消息给UPF，UPF丢弃任何PDU会话剩余的数据包并释放所有的与N4会话相关的隧道资源和上下文。
2b.UPF通过发送一个N4会话释放响应(包括N4会话ID)消息给SMF来应答N4会话释放请求。
203、包括3a和3b两个步骤。
3a.SMF通过Namf_通信_N1N2信息转换(Namf_Communication_N1N2MessageTransfer)服务操作响应AMF。其中，Namf_Communication_N1N2MessageTransfer包括N1SM信息(Information)、N2 SM资源释放请求。N1 SM Information包含PDU会话释放命令(PDU Session Release Command)。PDU Session Release Command中包含PDU会话ID(PDU Session ID)，释放的原因。
3b.如果PDU会话释放由SMF发起，SMF通过Namf_Communication_N1N2MessageTransfer)服务操作响应AMF。Namf_Communication_N1N2MessageTransfer包括N1 SM Information、跳转指示(skip indicator)。N1SM Information包含PDU Session Release Command。其中，Skip indicator用于指示AMF是否可能跳过AMF发送N1SM容器给终端。
如果PDU会话的数据面连接是激活的，SMF在Namf_Communication_N1N2MessageTransfer中还需携带N2资源释放请求(N2 Resource Release request)，N2 Resource Release request中携带PDU Session ID、用于释放与PDU会话相关的(R)AN资源。
204、如果终端处于CM-空闲(CM-IDLE)状态，而且skip indicator包含在 Namf_Communication_N1N2MessageTransfer服务操作中，AMF向终端发送一个N11消息，N11消息中携带skip indicator。步骤205-207跳过。
如果终端处于CM-IDLE状态，并且Namf_Communication_N1N2MessageTransfer服务操作中不包含skip indicator，即没有指示N1SM发送可以被跳过，则AMF发起网络触发的服务请求流程来发送非接入层面(Non-Access Stratum，NAS)消息给终端，NAS消息中携带PDU session ID和N1 SM information。
如果终端处于CM-连接(CM-CONNECTED)状态，AMF将从SMF收到的SM消息(包含N2 SM Resource Release request,N1 SM information)转发给(R)AN。
205、(R)AN接收AMF发送的SM消息(包含N2 SM Resource Release request,N1 SM information)，释放PDU会话相关的(R)AN侧的空口资源，删除PDU会话上下文。
具体的，(R)AN和终端交换AN特有的信令(如AN-specific resource modification)来释放PDU会话相关的(R)AN侧的空口资源，例如，在3GPP RAN的情况下，通过无线资源控制连接重配置(radio resource control Connection Reconfiguration，RRC)来释放PDU会话相关的(R)AN侧的空口资源。(R)AN在RRC信令中可携带任何从AMF收到的NAS消息，例如，N1SM PDU Session Release Command。
终端反馈NAS消息(包含PDU session ID,N1 SM information(PDU Session Release Ack))响应PDU会话释放命令，例如，通过(R)AN的N1SM信令。
206、如果(R)AN收到了一个N2SM请求来释放AN资源，则(R)AN通过发送N2 SM Resource Release Ack消息来响应N2 SM资源释放请求给AMF。N2 SM Resource Release Ack消息中包含N1SM information(PDU Session Release Ack)、用户地址信息(User Location Information)。
否则，(R)AN仅仅转发从终端到AMF的NAS消息(PDU session ID,N1 SM information(PDU Session Release Ack))。
实际应用中，PDU会话释放流程还包括更多的信令交互，图2中仅示出了与本申请实施例相关的交互过程。
3)、本地数据网络(local area data network，LADN)，是DN的一种具体形式。主要为企业、体育场活动、音乐厅等场景而部署的网络。LADN的服务区域(service area，SA)中包括跟踪区域(tracking area，TA)列表，只有当终端位于LADN的SA时，才能访问该LADN。当终端离开LADN SA时，网络应该释放该终端访问LADN的PDU会话(LADN PDU session)或者去激活该PDU会话的用户面。例如，如图3所示：假设LADN SA包括三个TA，分别用TA1、TA2和TA3来表示。因为RAN1在LADN SA覆盖范围内，所以终端移动至RAN1下时，可以通过RAN1建立访问LADN的会话。当终端移动至RAN2时，由于RAN2不在LADN SA覆盖范围内，则终端不能通过RAN2访问LADN。
4)、签约：是指使用终端的用户与运营商之间的签约。
5)、DNN，用于标识不同的DN。签约数据在网络侧和终端侧中的存储和通知，可以用终端的ID和DNN来进行标识。
6)、签约数据，是指分别存储在网络侧和终端侧的跟签约相关的数据。UDM中针对每一个终端存储并管理与该终端有关的签约数据，对于每一个终端来说，与终端有关的签约数据(可简称为终端的签约数据)中包括使用该终端接入所有签约授权的DN所依据的签约数据，DN通过DNN来标识。UDM对终端的签约数据可以以DNN为粒度进行存储 和管理，例如，一个终端的签约数据中包含一个或多个DNN的签约数据，一个DNN的签约数据为该终端与该DNN所标识的DN进行通信所依据的签约数据。签约数据还可能在其它功能实体/网元中存储。其中，UDM中的签约数据长期存在；其它网元或者终端会在终端注册网络时或者建立PDU会话时或其它相关流程，从UDM直接或间接的获得签约数据。
7)、DNN的签约，可以是指DNN的签约数据，也可以指该使用终端接入DNN所标识的DN需要遵守的签约。
8)、签约变化，是指使用终端的用户与运营商之间的签约发生变化。
DNN的签约变化是指DNN的签约数据变化、或使用终端接入该DNN所标识的DN需要遵守的签约变化。DNN的签约变化可以包含以下几种情况：DNN的签约数据删除、DNN的签约数据新增、DNN的签约删除、DNN的签约新增。DNN的签约新增是指增加使用终端接入新的DNN所标识的DN需要遵守的签约。DNN的签约数据新增是指在增加新的DNN的基础上所增加的签约数据。DNN的签约数据删除是指将DNN的签约数据全部删除。可选的，还可以包括DNN不可用，例如，使用终端的用户无法使用DNN、或使用终端的用户无法接入DNN所标识的DN等。当发生DNN的签约变化时，可能会导致终端不能与发生签约变化的DNN所标识的DN建立PDU会话，或者终端需要将该终端与发生签约变化的DNN所标识的DN已建立的PDU会话信息删除，或者终端需要删除DNN的数据和上下文，或者终端需要新增DNN数据。
9)、签约数据变化，是指存储在网络侧和终端侧中的跟签约相关的数据发生变化。签约数据变化可以包含：签约数据删除、签约数据新增。签约数据删除也可能导致某些旧的签约数据不可用，签约数据删除可能是由于签约删除导致的。
本申请实施例以下描述中所述的签约变化为广义上的签约变化，包括上述第8)所述的签约变化和上述第9)点所述的签约数据变化。当提及签约变化时，所指签约变化为广义的含义，签约变化是指使用终端的用户与运营商之间的签约发生变化，或者存储在网络侧或终端侧的、使用终端的用户与运营商的签约数据发生变化。
本申请实施例提供了一种通信方法，用以在发生DNN的签约变化时，通过核心网网元将该DNN的签约变化的信息通知给终端。以下叙述中，为方便描述，DNN的签约变化可以简述为签约变化。本申请实施例提供的通信方法适用于如图1所示的通信系统，参阅图4所示，该方法的流程包括：
S401、第二核心网网元向第一核心网网元发送通知信息，第一核心网网元接收第二核心网网元的通知信息，该通知信息用于指示签约变化。
S402、第一核心网网元向终端发送第一信息，终端接收第一核心网网元发送的第一信息，第一信息用于通知终端DNN的签约变化。
S403、终端删除发生签约变化的DNN的数据和上下文，或新增DNN的数据。
若DNN为LADN DNN，则终端需要删除LADN DNN信息。
本步骤中，若终端已建立与该DNN所标识的DN的PDU会话，则终端还可将PDU会话信息删除。
通过以上方法，通过核心网网元向终端发送携带用于指示签约变化的信息，能够达到通知终端签约变化的目的。
以下根据第一核心网网元和第二核心网网元具体指代的功能实体不同，介绍一下图4 所示方法的几种可能的实现方式。
首先说明的是，UDM存储签约数据，且UDM能够判断是否发生签约变化，当UDM确定签约变化时，可以向AMF发送通知信息，或者向SMF发送通知信息，或者向AMF和SMF均发送通知信息，该通知信息用于指示签约变化。具体的，UDM根据存储的终端关于会话管理或PDU会话的上下文，确定终端与DNN所标识的DN已建立PDU会话时，UDM向SMF通知签约变化，或者，UDM向SMF和AMF均通知签约变化，该通知可通过通知消息发送，也可以携带于其它消息中。SMF接收到通知后，触发PDU会话释放流程，SMF在PDU会话释放流程中将签约变化的信息发送给终端，例如，签约变化可以具体为签约数据删除、或签约数据新增，具体发送的形式在下文中具体描述。当UDM根据存储的终端关于会话管理上下文或关于PDU会话的上下文，确定终端与DNN所标识的DN未建立PDU会话时，UDM可仅向AMF通知签约变化，可以不向SMF通知签约变化，AMF接收到通知后将签约变化的信息发送给终端。若UDM分别向AMF和SMF均通知签约变化，会造成网络侧信令浪费，AMF和SMF在接收到通知后，均会向终端通知该签约变化，会造成空口信令浪费，若二者通知不同步，在终端处于空闲态时会导致重复触发寻呼，增大信令开销。本申请实施例中，当UDM选择其中一个核心网网元通知签约变化，通过选择的核心网网元(如SMF或AMF)，将签约变化的信息通知给终端，能够有助于减少信令的开销，避免资源浪费。
以下图5a、图6a、图7a、图8a、图9a、图10a和图11a中不带箭头的实线标识网元之间的接口，带箭头的实线表示通过该接口发送信息，为方便示意，图5a、图6a、图7a、图8a、图9a、图10a和图11a中仅示出了通信系统架构中的部分网元或设备。
实现方式一、
实现方式一可以适用于DNN为LADN DNN的应用场景。
图5a为实现方式一的主要流程的示意图。如图5a所示，第一核心网网元为AMF实体，第二核心网网元为UDM实体。UDM向AMF发送用于指示签约变化的通知信息，AMF接收到该通知信息后，向终端发送第一信息，终端接收AMF发送的第一信息，第一信息用于通知终端签约变化。图5b示出了实现方式一的一种信令交互流程的示意图。如图5b所示：
S501、UDM确定签约变化；
S502、UDM向AMF发送通知信息，该通知信息用于向AMF指示签约变化。
可选的，该通知信息中可包含DNN，DNN的签约变化的指示，用户永久标识(subscriber permanent identifier，SUPI)。DNN的签约变化的指示可包括以下至少一项：DNN不可用指示(DNN unavailable indication)、DNN被删除指示(DNN deleted indication)、DNN签约数据删除指示、DNN签约数据新增指示、新增的DNN签约数据、签约数据类型(例如移动性签约、或会话管理签约)。若该DNN为LADN DNN，则该通知中包含：LADN DNN，LADN DNN发生变化的指示，SUPI。LADN DNN发生变化的指示可包括以下至少一项：LADN DNN不可用指示(LADN DNN unavailable indication)、LADN DNN被删除指示(LADN DNN deleted indication)、LADN DNN签约数据删除指示、LADN DNN签约数据新增指示、新增的LADN DNN签约数据、签约数据类型(例如移动性签约、或会话管理签约)。该通知信息的内容也可适用于发申请其它实现方式中用于指示DNN的签约变化的通知信息。
S503、AMF根据接收到的通知信息，执行一定的操作，例如将该DNN置为不可用，或者删除DNN的数据、或者保存新增的DNN的信息。
S504、AMF向终端发送第一信息，该第一信息用于通知终端签约变化。
可选的，AMF向终端发送第一信息可以携带一个指示(indication)信息，该指示信息用于指示终端签约变化。
若DNN为LADN DNN，则第一信息可以携带一个指示信息，该指示信息用于通知终端签约变化；或者，AMF还可以通过隐式指示的方式通知终端签约变化，例如，第一信息中只携带LADN DNN、且不携带LADN的服务区域；或者，所述第一信息中携带所述LADN DNN和LADN的服务区域列表、且所述LADN的服务区域列表为空；或者，第一信息中携带LADN DNN和LADN的服务区域、且LADN的服务区域大小为0。通常AMF会向终端发送LADN DNN和大小不为0的LADN的服务区域，通知终端能够使用的LADN和服务区域，若通过上述隐式携带指示的方式，可以向终端通知终端与该LADN相关的签约变化。
S505、终端接收到第一信息后，根据第一信息确定DNN的签约变化。并且，根据第一信息确定DNN的签约变化的具体类型，若具体类型为DNN的签约数据删除，则终端删除DNN的数据和上下文，若具体类型为DNN的签约数据新增，则终端保存新增DNN数据。若具体类型为DNN不可用，则终端将DNN置为不可用。
若DNN为LADN DNN，则终端接收到第一信息后，删除LADN DNN信息。
终端在接收到第一信息后，若第一信息中只携带LADN DNN，未携带LADN的服务区域或携带的LADN的服务区域大小为0，或者，所述第一信息中携带所述LADN DNN和LADN的服务区域列表、且所述LADN的服务区域列表为空。则确定LADN DNN的签约变化，终端删除LADN DNN信息。
需要说明的是，S503和S504没有先后的执行顺序，两个步骤还可以同时进行。
AMF根据某种或多种原因(例如终端移动性改变、网络策略、签约数据改变)，确定终端配置需要更新或者终端需要发起一个注册流程。具体的，AMF发送终端配置更新命令给终端，包含终端的参数：5G全球唯一临时标识(globally unique temporary identity，5G-GUTI),跟踪区标识列表(TAI List)、LADN信息(LADN information),网络标识和时区(network identity and time zone，NITZ)，终端配置更新原因(UE configuration update cause)。如果终端配置更新原因需要终端配置更新命令的响应，终端会发送一个终端配置更新完成消息给AMF。在终端配置需要更新或者终端需要发起注册流程的应用场景下，第一信息可以是终端配置更新命令(UE configuration update command)，即，AMF在向终端发送的UE configuration update command中携带签约变化的指示。
实现方式二、
如图6a所示，第一核心网网元为SMF，第二核心网网元为UDM。UDM向SMF通知DNN的签约变化，SMF接收到通知信息后，向终端发送第一信息，终端接收SMF发送的第一信息，第一信息用于通知终端DNN的签约变化。
基于实现方式二，若终端与DNN所标识的DN已建立PDU会话，则第一信息可以通过PDU会话释放流程来通知给终端。图6b为通过PDU会话释放流程来通知终端第一信息的信令示意图。如图6b所示，具体信令流程包括：
S601、UDM确定DNN的签约变化。
可选的，UDM根据存储的终端关于会话管理上下文或关于PDU会话的上下文信息，确定终端与该DNN所标识的DN已建立PDU会话，则UDM确定可以通过SMF向终端通知签约变化的信息。例如，可以通过PDU会话释放流程来通知。可选的，UDM可以仅通知给SMF，不通知给AMF。
S602、UDM向SMF发送通知，该通知信息用于指示DNN的签约变化。
S603、SMF决定释放终端与DNN所标识的DN建立的PDU会话。
触发释放PDU会话的原因是签约变化。
S604、SMF向终端发送第一信息，第一信息用于通知终端DNN的签约变化。
其中，SMF向终端发送的第一信息是通过AMF、接入网设备发送给终端的。具体的，在SMF决定释放PDU会话后，在PDU会话释放流程中通过AMF、接入网设备向终端发送信息，在各个步骤发送的信息中携带签约变化的指示，最终将DNN的签约变化的信息通知给终端。
结合图2所示的PDU会话释放流程，具体的，SMF通过3a或3b将签约变化的信息发送给AMF，具体的可在Namf_Communication_N1N2MessageTransfer操作服务中携带用于指示签约变化的信息。AMF通过步骤204将签约变化的信息发送给接入网设备，具体的可在N2 SM Resource Release request中携带用于指示签约变化的信息。接入网设备通过步骤205将签约变化的信息发送给终端，具体的可通过AN-specific resource modification携带用于指示签约变化的信息。
AMF在接收SMF发送的用于指示签约变化的信息后，需要执行一些操作。例如，若签约变化的具体类型为DNN的签约数据删除，则AMF删除DNN的数据，若具体类型为DNN的签约数据新增，则AMF保存新增的DNN数据。若具体类型为DNN不可用，则AMF将DNN置为不可用。
S605、终端接收到第一信息后，确定签约变化，根据第一信息确定DNN的签约变化。并且，根据第一信息确定DNN的签约变化的具体类型，若具体类型为DNN的签约数据删除，则终端删除DNN的数据和上下文，若具体类型为DNN的签约数据新增，则终端保存新增DNN数据。若具体类型为DNN不可用，则终端将DNN置为不可用。
实现方式三、
图7a为实现方式三的主要流程示意图。如图7a所示，第一核心网网元为SMF，第二核心网网元为AMF，UDM向AMF发送用于指示签约变化的通知信息，AMF接收UDM发送的通知信息，AMF向SMF发送用于指示签约变化的通知信息。具体流程包括：UDM在确定签约变化后，UDM选择只向AMF通知签约变化，UDM不向SMF通知签约变化；AMF接收到UDM的通知信息后，向SMF通知签约变化，SMF接收到通知后，向终端发送第一信息，终端接收SMF发送的第一信息，第一信息用于通知终端签约变化。
基于实现方式三，若终端与DNN所标识的DN已建立PDU会话，则第一信息可以通过PDU会话释放流程来通知给终端。图7b为通过PDU会话释放流程来通知终端第一信息的信令示意图。如图7b所示，具体信令流程包括：
S701、UDM确定DNN的签约变化。
S702a、UDM向AMF发送通知信息，AMF接收UDM发送的通知信息，该通知信息用于指示DNN的签约变化。
S702b、AMF接收UDM发送的通知信息后，执行一定的操作，例如删除DNN的签约数据和上下文，或者将DNN置为不可用，或者保存新增的DNN的信息。
S703、AMF向SMF发送通知信息，AMF接收UDM发送的通知信息，该通知信息用于指示签约变化。
S704～S706的步骤与S603～S605的步骤相同，不再赘述。
实现方式四、
图8a为实现方式四的主要流程示意图。如图8a所示，第一核心网网元为AMF，第二核心网网元为UDM，系统还包括第三核心网网元，第二核心网网元还向第三核心网网元发送通知，第三核心网网元接收第二核心网网元的通知信息，该通知信息用于指示签约变化，第三核心网网元为SMF。具体流程包括：UDM在确定签约变化后，UDM选择分别向AMF和SMF均通知签约变化。AMF接收到UDM的通知信息后，向终端发送第一信息，第一信息用于指示该签约变化。终端接收AMF发送的第一信息，确定签约变化，删除DNN的签约数据和上下文，或者将DNN置为不可用。另外若终端与DNN所标识的DN已建立PDU会话，则第一信息还用于指示终端删除PDU会话信息。SMF接收到UDM的通知信息后，向接入网设备发送指示信息(可简称信息)，该指示信息用于指示接入网设备删除终端与DNN所标识的DN建立的PDU会话上下文。
基于实现方式四，实际应用中，若终端与DNN所标识的DN已建立PDU会话，则SMF可以通过PDU会话释放流程来通知接入网设备。图8b为这种应用场景下具体的信令示意图。如图8b所示，具体信令流程包括：
S801、UDM确定DNN的签约变化。
S802a、UDM向AMF发送通知信息，AMF接收AMF发送的通知信息，该通知信息用于指示DNN的签约变化。
S802b、UDM向SMF发送通知信息，SMF接收AMF发送的通知信息，该通知信息用于指示DNN的签约变化。
S803a、AMF向终端发送第一信息，第一信息用于通知终端DNN的签约变化。
S803b、终端接收第一信息后，根据第一信息确定DNN的签约变化。并且，根据第一信息确定DNN的签约变化的具体类型，若具体类型为DNN的签约数据删除，则终端删除DNN的数据和上下文，若具体类型为DNN的签约数据新增，则终端保存新增DNN数据。若具体类型为DNN不可用，则终端将DNN置为不可用。
若DNN为LADN DNN，则终端接收到第一信息后，删除LADN DNN信息。
S803c、SMF决定释放终端与DNN所标识的DN建立的PDU会话。
触发释放PDU会话的原因是签约变化。
S803c和S803a没有先后的执行顺序，S803c和S803b也没有先后的执行顺序。
S804、SMF向接入网设备发送指示信息，用于向接入网设备指示删除PDU会话上下文并释放接入网设备侧PDU会话的空口资源。
在本步骤中，SMF不发送N1 SM信息给终端。可选的，该指示信息还用于指示接入网设备：若终端处于空闲态，不对该终端进行寻呼。
其中，SMF向接入网设备发送的指示信息是通过AMF发送给接入网设备的。具体的，在SMF决定释放PDU会话后，在PDU会话释放流程中通过AMF向接入网设备发送指示信息。
结合图2所示的PDU会话释放流程，具体的，SMF通过3a或3b将该指示信息(可称为第三信息)发送给AMF，具体的可在Namf_Communication_N1N2MessageTransfer操作服务中携带该指示信息。AMF通过步骤204将该指示信息(可称为第四信息)发送给接入网设备，具体的可在N2 SM Resource Release request中携带该指示信息。
S805、接入网设备接收到指示信息后，删除PDU会话上下文，释放接入网设备侧的PDU会话的空口资源。
实现方式五、
图9a为实现方式五的主要流程示意图。如图9a所示，第一核心网网元为AMF，第二核心网网元为UDM，系统还包括第三核心网网元，第二核心网网元还向第三核心网网元发送通知，第三核心网网元接收第二核心网网元的通知信息，该通知信息用于指示DNN的签约变化，第三核心网网元为SMF。具体流程包括：UDM在确定DNN的签约变化后，UDM选择分别向AMF和SMF均通知签约变化。AMF接收到UDM的通知信息后，在满足一定条件时才会向终端发送第一信息，第一信息用于指示该签约变化。具体的，AMF接收到UDM的通知信息后，判断终端是否与DNN所标识的DN之间建立PDU会话，当终端与DNN所标识的DN之间未建立PDU会话时，才向终端发送第一信息，当终端与DNN所标识的DN之间已建立PDU会话时，AMF不向终端发送第一信息。AMF会转发SMF发送的第一信息因为若终端与DNN所标识的DN之间已建立PDU会话，UDM会通过向SMF发送通知，使得SMF向终端通知签约变化的信息；若终端与DNN所标识的DN之间未建立PDU会话，UDM不会向SMF发送通知，这时AMF需要向终端发送第一信息来通知签约变化。终端接收第一信息后，确定签约变化，删除DNN或将DNN置为不可用，或者保存新增DNN的信息。SMF接收到UDM的通知信息后，向终端发送指示信息(可简称信息)，该指示信息用于通知终端签约变化。
基于实现方式五，实际应用中，该指示信息可以通过PDU会话释放流程来通知给终端。图9b为这种应用场景下的具体信令流程示意图。如图9b所示，具体信令流程包括：
S901、UDM确定DNN的签约变化。
S902a、UDM向AMF发送通知信息，AMF接收UDM发送的通知信息，该通知信息用于指示DNN的签约变化。
AMF接收UDM发送的通知信息后，执行一定的操作，例如删除DNN的签约数据和上下文，或者将DNN置为不可用，或者保存新增的DNN的信息。
S902b、UDM向SMF发送通知信息，SMF接收AMF发送的通知信息，该通知信息用于指示签约变化。
S903a、在终端与DNN所标识的DN之间建立PDU会话时，AMF不会根据UDM的通知信息向终端发送第一信息，SMF会根据UDM的通知信息向终端发送第一信息，其中，SMF通过AMF、接入网设备向终端发送的第一信息，AMF会在接收到SMF发送的第一信息后，转发SMF发送的第一信息，该第一信息中携带DNN的签约变化的信息。在终端与DNN所标识的DN之间未建立PDU会话时，AMF向终端发送第一信息，第一信息用于通知终端DNN的签约变化。
S903b、SMF决定释放终端与DNN所标识的DN建立的PDU会话。
触发释放PDU会话的原因是签约变化。
S904～S905的步骤与S604～S605的步骤相同，不再赘述。
实现方式六、
图10a为实现方式六的主要流程示意图。如图10a所示，第一核心网网元为AMF，第二核心网网元为UDM，系统还包括第三核心网网元，第二核心网网元还向第三核心网网元发送通知，第三核心网网元接收第二核心网网元的通知信息，该通知信息用于指示DNN 的签约变化，第三核心网网元为SMF。具体流程包括：UDM在确定DNN的签约变化后，UDM选择分别向AMF和SMF均发送通知信息，通过该通知信息来指示DNN的签约变化。AMF接收到UDM的通知信息后，判断是否存在终端与DNN所标识的DN建立的PDU会话，若存在，则AMF等待接收SMF发送的第二信息。实际应用中，若终端与DNN所标识的DN已建立PDU会话，则UDM会通过SMF通知给终端该签约变化的信息。于此，AMF若判断出存在该PDU会话，表明UDM会向SMF发送通知信息，则AMF不会立即向终端指示该签约变化的信息。第二信息为PDU会话相关信息，所述PDU会话相关信息是指在PDU会话释放流程中各个设备之间交互的信息。第二信息为SMF向终端发送的信息，通过AMF透传。AMF在接收到SMF发送的第二信息后，向终端发送第一信息。可选的，AMF将第二信息与第一信息发送给终端，或者将签约变化的指示携带在第一信息和第二信息中的其中一个信息，将携带签约变化指示的一个信息发送给终端。终端在接收到AMF发送的第一信息和/或第二信息后，删除PDU会话信息并执行该签约变化的其它操作，例如，删除DNN信息，将DNN置为不可用。这样，在UDM分别向AMF和SMF发送通知信息的情况下，AMF向终端只发送一次信息，就能够实现向终端通知该签约变化，节省了网络侧信令开销和空口信令开销。且对于终端处于空闲态的场景，避免了网络侧发起至少两次寻呼，从而进一步节省了信令开销。
图10b所示，一种具体应用场景下的信令流程包括：
S1001、UDM确定DNN的签约变化。
S1002a、UDM向AMF发送通知，SMF接收UDM发送的通知信息，该通知信息用于指示DNN的签约变化。
S1002b、UDM向SMF发送通知，AMF接收UDM发送的通知信息，该通知信息用于指示DNN的签约变化。
S1003a、AMF接收UDM发送的通知信息后，在终端与DNN所标识的DN之间建立PDU会话时，等待接收SMF发送的第二信息，第二信息可以是PDU会话相关信息。
并且，AMF接收UDM发送的通知信息后，执行一定的操作，例如删除DNN的签约数据和上下文，或者将DNN置为不可用，或者保存新增的DNN的信息。
S1003b、SMF接收UDM发送的通知信息后，决定释放终端与DNN所标识的DN建立的PDU会话。
S1004、SMF向AMF发送第二信息，AMF接收SMF发送的第二信息，该第二信息中包含该签约变化的信息。
结合图2所示的PDU会话释放流程，SMF通过3a或3b将第二信息发送给AMF，具体的可在Namf_Communication_N1N2MessageTransfer操作服务中携带第二信息。
S1005、AMF接收到SMF发送的第二信息后，将第一信息发送给终端。可选的，发送第一信息或第二信息中的至少一个。第一信息和第二信息均用于指示签约变化。也可以认为第二信息等同于第一信息，即，AMF向终端发送第一信息等同于AMF向终端发送第二信息。
结合图2所示的PDU会话释放流程，AMF通过步骤204将第一信息和第二信息发送给、接入网设备，具体的可在N2 SM Resource Release request中携带第一信息和/或第二信息。接入网设备通过步骤205将第一信息和/或第二信息发送给终端，具体的可通过AN-specific resource modification携带第一信息和/或第二信息。
本申请实施例中，AMF在终端与DNN所标识的DN之间的PDU会话建立后，存储DNN与PDU session ID，用于AMF在接收到第二信息时，判断第二信息是否为PDU会话相关信息。
实际应用中，终端与DNN所标识的DN之间建立的PDU会话可能不止一个，当终端与DN之间建立多个PDU会话时，SMF在接收到UDM发送的通知信息后，可能会触发多个PDU会话释放流程，也就是SMF可能会向AMF发送多个第二信息。可选的，在S1004a中，AMF接收UDM发送的通知信息后，开启定时器，在定时器到期之前保持静默，该静默的定义为AMF不向终端发送该签约变化的信息，等待接收SMF发送的第二信息；在定时器到期时，无论是否接收到SMF发送的第二信息，均可以向终端发送第一信息。或者在定时器到期之前保持静默，在静默期间等待接收SMF发送的第二信息，若接收到SMF发送的第二信息达到预定值，则向终端一次性发送第一信息和/或至少一个第二信息，该预定值为协议规定或UDM向AMF通知的。也可以，在定时器到期之前，若AMF确定已接收到全部的用于释放PDU会话的第二信息，则向终端一次性发送第一信息和/或至少一个第二信息。这样，避免了每一个释放PDU流程发送一次PDU会话相关信息而造成的信令浪费，将AMF向终端发送的签约变化的信息、SMF向终端发送的签约变化的信息、和SMF向终端发送的多次PDU会话相关信息一次性发送给终端，有助于节省空口信令开销，若将签约变化的指示携带在PDU会话相关信息中，进一步节省系统资源。
S1006、终端接收到第一信息后，确定签约变化，则删除DNN的数据和上下文，或者将DNN置为不可用，或者保存新增DNN的信息。
若DNN为LADN DNN，则终端在接收第一信息后，将LADN DNN信息删除。
实现方式七、
图11a示出了实现方式七的主要流程示意图。如图11a所示，第一核心网网元为AMF实体，第二核心网网元为UDM实体。UDM向AMF通知签约变化，AMF接收到该通知后，向PCF发送用于指示签约变化的通知信息，PCF更新UE路由选择策略(UE Route Selection Policy，URSP)，并将更新的URSP发送给AMF，AMF接收到更新的URSP后，向终端发送第一信息，终端接收AMF发送的第一信息，第一信息用于通知终端签约变化、以及更新的URSP。
图11为实现方式七的一种信令交互流程的示意图。第一核心网网元为AMF实体，第二核心网网元为UDM实体。如图11a所示：
S1101、UDM确定签约变化。
S1102、UDM向AMF发送通知，该通知用于向AMF指示签约变化。
S1103、AMF根据接收到的通知信息，执行一定的操作，例如删除DNN的签约数据和上下文，或者将DNN置为不可用，或者保存新增的DNN的信息。
S1104、AMF接收到该通知后，向PCF发送用于指示签约变化的通知信息，PCF接收AMF发送的通知信息。
S1105、PCF接收AMF发送的通知信息后，更新URSP。
例如，删除URSP中与该DNN相关的内容，或者，增加URSP中与新增DNN相关的内容。
S1106、PCF将更新的URSP发送给AMF，AMF接收PCF发送的URSP。
S1107、AMF接收PCF发送的URSP后，向终端发送第一信息，第一信息用于通知终端签约变化，以及向终端指示更新的URSP。
S1108、终端接收到第一信息后，确定签约变化，以及确定URSP更新。终端根据第一信息确定DNN的签约变化的具体类型，若具体类型为DNN的签约数据删除，则终端删 除DNN的数据和上下文，若具体类型为DNN的签约数据新增，则终端保存新增DNN数据。若具体类型为DNN不可用，则终端将DNN置为不可用。终端根据第一信息更新URSP。
基于图4所示的通信方法同一发明构思，本申请还提供了一种通信装置1200，该通信装置1200可以应用于如图1所示的通信系统，用于实现如图4所示的通信方法。该通信装置1200为第一核心网网元。参阅图12所示，所述通信装置1200包括：接收单元1201、发送单元1202，其中：
接收单元1201，用于接收第二核心网网元的通知信息，该通知信息用于指示签约变化。
发送单元1202，用于向终端发送第一信息，第一信息用于通知终端签约变化。
本申请实施例提供的核心网网元1200，通过核心网网元1200向终端发送携带用于指示签约变化的信息，能够达到通知终端签约变化的目的。
基于以上实施例，本申请还提供了一种AMF 1300，该AMF1300可以应用于如图1所示的通信系统，用于实现上述实施例中任意一种实现方式中AMF执行的功能。该AMF1300能够执行核心网网元1200所执行的所有功能，在AMF1300执行图4所示的方法时，第二核心网网元可以是UDM。该AMF1300包括接收单元1301、发送单元1302。接收单元1301执行图12中接收单元1201执行的步骤，发送单元1302执行图12中发送单元1202执行的步骤。
此外，AMF 1300中的接收单元1301和发送单元1302还可实现上述实施例的任意一种实现方式中AMF的其他操作或功能，此处不再赘述。
基于以上实施例，本申请还提供了一种SMF 1400，该SMF1400可以应用于如图1所示的通信系统，用于实现上述实施例中任意一种实现方式中SMF执行的功能。该SMF1400能够执行核心网网元1200所执行的所有功能，在SMF1400执行图4所示的方法时，第二核心网网元可以是UDM，也可以是AMF。该SMF1400包括接收单元1401、发送单元1402。接收单元1401执行接收单元1201执行图12中的步骤，发送单元1402执行图12中发送单元1202执行的步骤。
此外，SMF 1400中的接收单元1401和发送单元1402还可实现上述实施例的任意一种实现方式中SMF的其他操作或功能，此处不再赘述。
基于以上实施例，本申请还提供了一种PCF1500，该PCF1500可以应用于如图1所示的通信系统，用于实现上述实施例中实现方式七中PCF执行的功能。该PCF1500能够执行核心网网元1200所执行的所有功能，在PCF1500执行图4所示的方法时，第二核心网网元可以是AMF。该PCF1500包括接收单元1501、处理单元1502和发送单元1503。接收单元1501执行接收单元1201执行图12中的步骤，发送单元1502执行发送单元1202执行图12中的步骤。
具体的，接收单元1501，用于接收AMF发送的签约变化的通知信息；
处理单元1502，用于根据通知信息更新URSP。
发送单元1502，用于通过AMF、接入网设备向终端发送更新的URSP。
此外，PCF1500中的接收单元1501、处理单元1502和发送单元1503还可实现上述实施例的实现方式七中PCF的其他操作或功能，此处不再赘述。
基于以上实施例，本申请还提供了一种通信装置1600，该通信装置1600可以应用于如图1所示的通信系统，用于实现上述实施例中任意一种实现方式中终端执行的功能。该通信装置1600包括接收单元1601、处理单元1602。接收单元1601，用于接收核心网网元发送的第一信息，所述核心网网元为接入和移动管理功能AMF、或会话管理功能SMF，所述第一信息用于指示数据网络名称DNN的签约变化；处理单元1602根据所述第一信息，删除DNN的数据和上下文，或新增DNN数据。
此外，通信装置1600中的接收单元1601和处理单元1602还可实现上述实施例的任意一种实现方式中终端的其他操作或功能，此处不再赘述。
需要说明的是，本申请实施例中对模块的划分是示意性的，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，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。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
所述集成的单元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全部或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)或处理器(processor)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。
基于图4所示的通信方法同一发明构思，本申请还提供了一种核心网网元1700，该核心网网元1700可以应用于如图1所示的通信系统，用于实现如图4所示的通信方法。该核心网网元1700记为第一核心网网元。参阅图17所示，所述核心网网元1700包括：收发器1701和处理器1702，可选的还包括存储器1703。其中：
收发器1701，用于接收和发送数据，实现与所述通信系统中其他设备之间的通信。
处理器1702，用于执行一组程序，当程序被执行时，该执行使得处理器1702实现图4所示的实施例提供的通信方法，具体可以参见上述实施例中的描述，此处不再赘述。
所述存储器1703，用于存储处理器1702执行的程序。具体地，程序可以包括程序代码，该程序代码包括计算机操作指令。存储器1703可能包含随机存取存储器(random access memory，RAM)，也可能还包括非易失性存储器(non-volatile memory)，例如至少一个磁盘存储器。处理器1702执行存储器1703所存放的程序，实现上述功能，从而实现上述实施例提供的通信方法。
基于上述实施例，本申请还提供了一种AMF1800，该AMF1800可以应用于如图1所示的通信系统，用于实现上述实施例中任意一种实现方式中AMF执行的功能。参阅图18所示，该AMF1800包括：收发器1801和处理器1802，可选的还包括存储器1803。其中：
收发器1801，用于接收和发送数据，实现与所述通信系统中其他设备之间的通信。
处理器1802，用于执行一组程序，当程序被执行时，该执行使得处理器1802实现上述实施例中任意一种实现方式中AMF执行的功能，具体可以参见上述实施例中的描述，此处不再赘述。
所述存储器1803，用于存储处理器1802执行的程序。具体地，程序可以包括程序代码，该程序代码包括计算机操作指令。存储器1803可能包含随机存取存储器(random access memory，RAM)，也可能还包括非易失性存储器(non-volatile memory)，例如至少一个磁盘存储器。处理器1802执行存储器1803所存放的程序，实现上述功能，从而实现上述实施例中任意一种实现方式中AMF执行的方法。
基于上述实施例，本申请还提供了一种SMF1900，该SMF1900可以应用于如图1所示的通信系统，用于实现上述实施例中任意一种实现方式中SMF执行的功能。参阅图19 所示，该SMF1900包括：收发器1901和处理器1902，可选的还包括存储器1903。其中：
收发器1901，用于接收和发送数据，实现与所述通信系统中其他设备之间的通信。
处理器1902，用于执行一组程序，当程序被执行时，该执行使得处理器1902实现上述实施例中任意一种实现方式中SMF执行的功能，具体可以参见上述实施例中的描述，此处不再赘述。
所述存储器1903，用于存储处理器1902执行的程序。具体地，程序可以包括程序代码，该程序代码包括计算机操作指令。存储器1903可能包含随机存取存储器(random access memory，RAM)，也可能还包括非易失性存储器(non-volatile memory)，例如至少一个磁盘存储器。处理器1902执行存储器1903所存放的程序，实现上述功能，从而实现上述实施例中任意一种实现方式中SMF执行的方法。
基于上述实施例，本申请还提供了一种PCF2000，该PCF2000可以应用于如图1所示的通信系统，用于实现上述实施例中实现方式七中PCF执行的功能。参阅图20所示，该PCF2000包括：收发器2001和处理器2002，可选的还包括存储器2003。其中：
收发器2001，用于接收和发送数据，实现与所述通信系统中其他设备之间的通信。
处理器2002，用于执行一组程序，当程序被执行时，该执行使得处理器2002实现上述实施例中实现方式七中PCF执行的功能，具体可以参见上述实施例中的描述，此处不再赘述。
所述存储器2003，用于存储处理器2002执行的程序。具体地，程序可以包括程序代码，该程序代码包括计算机操作指令。存储器2003可能包含随机存取存储器(random access memory，RAM)，也可能还包括非易失性存储器(non-volatile memory)，例如至少一个磁盘存储器。处理器2002执行存储器2003所存放的程序，实现上述功能，从而实现上述实施例中实现方式七中PCF执行的方法。
基于上述实施例，本申请还提供了一种通信装置2100，该通信装置2100可以应用于如图1所示的通信系统，用于实现上述实施例中终端执行的功能。参阅图21所示，该通信装置2100包括：收发器2101和处理器2102，可选的还包括存储器2103。其中：
收发器2101，用于接收和发送数据，实现与所述通信系统中其他设备之间的通信。
处理器2102，用于执行一组程序，当程序被执行时，该执行使得处理器2102实现上述实施例中终端执行的功能，具体可以参见上述实施例中的描述，此处不再赘述。
所述存储器2103，用于存储处理器2102执行的程序。具体地，程序可以包括程序代码，该程序代码包括计算机操作指令。存储器2103可能包含随机存取存储器(random access memory，RAM)，也可能还包括非易失性存储器(non-volatile memory)，例如至少一个磁盘存储器。处理器2102执行存储器2103所存放的程序，实现上述功能，从而实现上述实施例中终端执行的方法。
本申请实施例提供了一种计算机存储介质，存储有计算机程序，该计算机程序包括用于执行图4所述的通信方法和上述实施例任意一种实现方式提供的方法。
本申请实施例提供了一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机执行图4所述的通信方法和上述实施例任意一种实现方式提供的方法。
本领域内的技术人员应明白，本申请的实施例可提供为方法、系统、或计算机程序产品。因此，本申请可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本申请可采用在一个或多个其中包含有计算机可用程序代码的 计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
本申请是参照根据本申请实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
尽管已描述了本申请的优选实施例，但本领域内的技术人员一旦得知了基本创造性概念，则可对这些实施例作出另外的变更和修改。所以，所附权利要求意欲解释为包括优选实施例以及落入本申请范围的所有变更和修改。
显然，本领域的技术人员可以对本申请实施例进行各种改动和变型而不脱离本申请实施例的精神和范围。这样，倘若本申请实施例的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (29)

  1. 一种通信方法，其特征在于，包括：
    第一核心网网元接收第二核心网网元的通知信息，所述通知信息用于指示数据网络名称DNN的签约变化；
    所述第一核心网网元向终端发送第一信息，所述第一信息用于通知所述终端所述DNN的签约变化。
  2. 如权利要求1所述的方法，其特征在于，所述DNN的签约变化为DNN的签约数据删除，或DNN的签约数据新增。
  3. 如权利要求1或2所述的方法，其特征在于，所述DNN为局部区域数据网络LADN DNN；
    所述第一信息中携带所述LADN DNN、且不携带LADN的服务区域；或者，所述第一信息中携带所述LADN DNN和LADN的服务区域列表、且所述LADN的服务区域列表为空；或者，所述第一信息中携带所述LADN DNN和LADN的服务区域、且所述LADN的服务区域大小为0；
    所述第一信息还用于指示所述终端将所述LADN DNN置为不可用或删除所述LADN DNN或删除LADN信息。
  4. 如权利要求1～3任一项所述的方法，其特征在于，所述第一核心网网元为接入和移动管理功能AMF；
    所述第一核心网网元向所述终端发送第一信息，包括：
    所述第一核心网网元在满足条件时，向所述终端发送第一信息；其中，所述条件为：所述终端与所述DNN所标识的数据网络DN未建立分组数据单元PDU会话。
  5. 如权利要求1～3任一项所述的方法，其特征在于，所述第一核心网网元为AMF；
    所述第一核心网网元向所述终端发送第一信息，包括：
    所述AMF在接收会话管理功能SMF发送的第二信息后，向所述终端发送第一信息。
  6. 如权利要求1～3任一项所述的方法，其特征在于，所述第一核心网网元为AMF，所述第二核心网网元为统一数据管理UDM；
    所述第一核心网网元向所述终端发送第一信息，包括：
    所述AMF确定所述终端与所述DNN所标识的DN已建立PDU会话，启动定时器；
    所述AMF在所述定时器到期时，向所述终端发送所述第一信息；或者，所述AMF在所述定时器到期之前，确定接收到SMF发送的第二信息的数目达到预定值，则向所述终端发送所述第一信息。
  7. 如权利要求5或6所述的方法，其特征在于，所述第二信息为PDU会话相关信息，所述第一信息用于指示所述终端删除PDU会话信息。
  8. 如权利要求1～3任一项所述的方法，其特征在于，所述第一核心网网元为AMF，所述第二核心网网元为UDM；
    所述第一信息还用于指示所述终端删除PDU会话信息；
    所述方法还包括：
    所述第一核心网网元接收SMF发送的第三信息，所述第三信息用于指示接入网设备删除所述终端与DNN所标识的数据网络DN建立的PDU会话的上下文；
    所述第一核心网网元根据所述第三信息，向所述接入网设备发送第四信息，所述第四信息用于指示所述接入网设备删除PDU会话上下文。
  9. 如权利要求8所述的方法，其特征在于，所述第三信息还用于向所述第一核心网网元指示若所述终端处于空闲态，不对所述终端进行寻呼。
  10. 如权利要求1～3任一项所述的方法，其特征在于，所述第一核心网网元为AMF，所述第二核心网网元为UDM；
    所述方法还包括：
    所述第一核心网网元向策略控制功能PCF通知：所述签约变化，用于指示所述PCF更新用户设备UE路由选择策略URSP；
    所述第一信息中携带更新后的URSP，用于指示所述终端更新URSP。
  11. 如权利要求1～3任一项所述的方法，其特征在于，所述第一核心网网元为SMF，所述第二核心网元为UDM或AMF。
  12. 一种通信方法，其特征在于，包括：
    统一数据管理UDM确定数据网络名称DNN的签约变化；
    所述UDM向会话管理功能SMF发送通知信息，和/或，所述UDM向接入和移动管理功能AMF发送通知信息；
    其中，所述通知信息用于指示数据网络名称DNN的签约变化。
  13. 如权利要求12所述的方法，其特征在于，当终端与所述DNN所标识的数据网络DN已建立分组数据单元PDU会话时，所述UDM向所述SMF发送通知信息，或者，所述UDM分别向所述SMF和所述AMF均发送通知信息；
    当终端与所述DNN所标识的DN未建立PDU会话时，所述UDM仅向所述AMF发送通知信息。
  14. 一种通信方法，其特征在于，包括：
    终端接收核心网网元发送的第一信息，所述核心网网元为接入和移动管理功能AMF、或会话管理功能SMF，所述第一信息用于指示数据网络名称DNN的签约变化；
    所述终端根据所述第一信息，删除DNN的数据和上下文，或新增DNN数据。
    可选的，所述核心网网元为PCF，所述终端根据第一信息更新用户设备UE路由选择策略URSP。
  15. 一种通信装置，其特征在于，所述装置应用于第一核心网网元，所述装置包括收发器和处理器，所述处理器用于调用一组程序，当程序被执行时，所述处理器用于执行以下操作：
    通过所述收发器接收第二核心网网元的通知信息，所述通知信息用于指示数据网络名称DNN的签约变化；
    通过所述收发器向终端发送第一信息，所述第一信息用于通知所述终端所述DNN的签约变化。
  16. 如权利要求15所述的装置，其特征在于，所述DNN的签约变化为DNN的签约数据删除，或DNN的签约数据新增。
  17. 如权利要求15或16所述的装置，其特征在于，所述DNN为局部区域数据网络LADN DNN；
    所述第一信息中携带所述LADN DNN、且不携带LADN的服务区域；或者，所述第 一信息中携带所述LADN DNN和LADN的服务区域列表、且所述LADN的服务区域列表为空；或者，所述第一信息中携带所述LADN DNN和LADN的服务区域、且所述LADN的服务区域大小为0；
    所述第一信息还用于指示所述终端将所述LADN DNN置为不可用或删除所述LADN DNN或删除LADN信息。
  18. 如权利要求15～17任一项所述的装置，其特征在于，所述装置为接入和移动管理功能AMF；
    所述处理器具体用于：
    在满足条件时，通过所述收发器向所述终端发送第一信息；其中，所述条件为：所述终端与所述DNN所标识的数据网络DN未建立分组数据单元PDU会话。
  19. 如权利要求15～17任一项所述的装置，其特征在于，所述装置为AMF；
    所述处理器具体用于：
    在接收会话管理功能SMF发送的第二信息后，通过所述收发器向所述终端发送第一信息。
  20. 如权利要求15～17任一项所述的装置，其特征在于，所述装置为AMF，所述第二核心网网元为统一数据管理UDM；
    所述处理器具体用于：
    确定所述终端与所述DNN所标识的DN已建立PDU会话，启动定时器；
    在所述定时器到期时，通过所述收发器向所述终端发送所述第一信息；或者，在所述定时器到期之前，确定接收到SMF发送的第二信息的数目达到预定值，则通过所述收发器向所述终端发送所述第一信息。
  21. 如权利要求19或20所述的装置，其特征在于，所述第二信息为PDU会话相关信息，所述第一信息用于指示所述终端删除PDU会话信息。
  22. 如权利要求15～17任一项所述的装置，其特征在于，所述装置为AMF，所述第二核心网网元为UDM；
    所述第一信息还用于指示所述终端删除PDU会话信息；
    所述处理器还用于：
    通过所述收发器接收SMF发送的第三信息，所述第三信息用于指示接入网设备删除所述终端与DNN所标识的数据网络DN建立的PDU会话的上下文；
    根据所述第三信息，通过所述收发器向所述接入网设备发送第四信息，所述第四信息用于指示所述接入网设备删除PDU会话上下文。
  23. 如权利要求22所述的装置，其特征在于，所述第三信息还用于向所述第一核心网网元指示若所述终端处于空闲态，不对所述终端进行寻呼。
  24. 如权利要求15～17任一项所述的装置，其特征在于，所述装置为AMF，所述第二核心网网元为UDM；
    所述处理器还用于：
    通过所述收发器向策略控制功能PCF通知：所述签约变化，用于指示所述PCF更新用户设备UE路由选择策略URSP；
    所述第一信息中携带更新后的URSP，用于指示所述终端更新URSP。
  25. 如权利要求15～17任一项所述的装置，其特征在于，所述装置为SMF，所述第二 核心网元为UDM或AMF。
  26. 一种统一数据管理UDM，其特征在于，所述UDM包括收发器和处理器，所述处理器用于调用一组程序，当程序被执行时，所述处理器用于执行以下操作：包括：
    确定数据网络名称DNN的签约变化；
    通过所述收发器向会话管理功能SMF发送通知信息，和/或，向接入和移动管理功能AMF发送通知信息；
    其中，所述通知信息用于指示数据网络名称DNN的签约变化。
  27. 如权利要求26所述的UDM，其特征在于，所述处理器具体用于：
    当终端与所述DNN所标识的数据网络DN已建立分组数据单元PDU会话时，通过所述收发器向所述SMF发送通知信息，或者，分别向所述SMF和所述AMF均发送通知信息；
    当终端与所述DNN所标识的DN未建立PDU会话时，仅向所述AMF发送通知信息。
  28. 一种通信装置，其特征在于，所述装置包括收发器和处理器，所述处理器用于调用一组程序，当程序被执行时，所述处理器用于执行以下操作：
    通过所述收发器接收核心网网元发送的第一信息，所述核心网网元为接入和移动管理功能AMF、或会话管理功能SMF，所述第一信息用于指示数据网络名称DNN的签约变化；
    根据所述第一信息，删除DNN的数据和上下文，或新增DNN数据。
  29. 一种通信系统，其特征在于，包括：
    统一数据管理UDM，用于向接入和移动管理功能AMF和/或会话管理功能SMF发送通知信息，所述通知信息用于指示数据网络名称DNN的签约变化；
    所述AMF或所述SMF，用于接收所述UDM的通知信息，向所述终端发送第一信息，所述第一信息用于通知所述终端所述DNN的签约变化；
    所述终端，用于接收所述AMF和/或所述SMF发送的第一信息，根据所述第一信息，删除DNN的数据和上下文，或新增DNN数据。
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