WO2020057179A1 - 策略控制方法、设备及系统 - Google Patents

策略控制方法、设备及系统 Download PDF

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Publication number
WO2020057179A1
WO2020057179A1 PCT/CN2019/090433 CN2019090433W WO2020057179A1 WO 2020057179 A1 WO2020057179 A1 WO 2020057179A1 CN 2019090433 W CN2019090433 W CN 2019090433W WO 2020057179 A1 WO2020057179 A1 WO 2020057179A1
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WIPO (PCT)
Prior art keywords
network element
policy control
session
terminal
nssai
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PCT/CN2019/090433
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English (en)
French (fr)
Inventor
阎亚丽
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP19861348.1A priority Critical patent/EP3684100B1/en
Priority to US16/825,537 priority patent/US11102844B2/en
Publication of WO2020057179A1 publication Critical patent/WO2020057179A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/08—Upper layer protocols
    • H04W80/10—Upper layer protocols adapted for application session management, e.g. SIP [Session Initiation Protocol]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/12—Setup of transport tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M15/00—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP
    • H04M15/66—Policy and charging system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/04—Error control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/11—Allocation or use of connection identifiers

Definitions

  • the present application relates to the field of communications technologies, and in particular, to a method, device, and system for policy control.
  • the terminal requests to establish the same single network slice selection assistance information (single information selection (S-NSSAI) and data network name (DNN)
  • S-NSSAI single information selection
  • DNN data network name
  • S-NSSAI single information selection
  • DNN data network name
  • S-NSSAI single information selection
  • DNN data network name
  • S-NSSAI single information selection
  • DNN data network name
  • the contract information may include, for example, the maximum guaranteed bandwidth that the PCF is authorized to grant to the terminal, or the remaining usage of the PCF network element that is authorized to the terminal.
  • multiple PCF network elements make policy decisions based on the subscription information, which may cause the policies formulated for multiple PDU sessions of the same terminal with the same S-NSSAI and DNN to conflict with the contract information.
  • the total maximum guaranteed bandwidth authorized for multiple PDU sessions with the same S-NSSAI and DNN of the same terminal exceeds the maximum guaranteed bandwidth authorized by the PCF network element to the terminal in the contract information
  • the same S- for the same terminal has the same S-
  • the total accumulated usage of multiple PDU sessions of NSSAI and DNN exceeds the remaining usage authorized by the PCF network element to the terminal in the contract information.
  • the embodiments of the present application provide a method, a device, and a system for policy control, which can avoid the problem that the policies formulated for multiple PDU sessions with the same S-NSSAI and DNN of the same terminal conflict with the contract information obtained from the unified database network element.
  • a policy control method includes: a mobile management network element sending a first request message for creating a first session to a first session management network element, the first request message including an identifier of a terminal, A single network slice selects auxiliary information S-NSSAI and data network name DNN; the first session management network element receives a first request message from the mobile management network element, and sends a second request message to the binding support network element, the second request The message includes the identity of the terminal, the S-NSSAI, and the DNN; the first session management network element receives the identity of the policy control network element from the binding support network element, and selects the policy control network according to the identity of the policy control network element yuan.
  • the mobile management network element may send a first request message for creating a first session to the first session management network element, the first request message includes a terminal identifier, an S-NSSAI And DNN. Further, the first session management network element may obtain the identity of the corresponding policy control network element from the binding support network element according to the identity of the terminal, S-NSSAI, and DNN, and select the policy control network element according to the identity of the policy control network element.
  • the policy control network element may be a policy control network element corresponding to the second session.
  • the same policy control network element can be selected for multiple sessions of the same terminal with the same S-NSSAI and DNN, so multiple PDU sessions with the same S-NSSAI and DNN for the same terminal can be avoided.
  • the method further includes: the mobile management network element determines the first session and the established first terminal of the terminal.
  • the two sessions have the same S-NSSAI and DNN; correspondingly, the first request message further includes indication information, which is used to instruct the first session management network element to obtain the identity of the policy control network element from the binding support network element Or, the indication information is used to indicate that a session of the terminal having the same S-NSSAI and DNN as the first session has been established; or, the indication information is used to indicate that there is corresponding binding information for the first session.
  • the mobile management network element may send to the first session management network element.
  • the first request message includes instruction information, so that the first session management network element can obtain the identity of the policy control network element from the binding support network element according to the instruction information.
  • the method before the mobile management network element sends the first request message to the first session management network element, the method further includes: the mobile management network element determines that the terminal establishes the terminal in a non-roaming or home routing scenario First conversation.
  • the method further includes: during the establishment of the second session, the second session management network element selects the policy control network element, and sends a registration request to the binding support network element, where the registration request Including the identity of the terminal, the S-NSSAI, the DNN, and the identity of the policy control network element.
  • the binding-supporting network element can store the correspondence between the identity of the terminal, the S-NSSAI, the DNN, and the identity of the policy-controlling network element, and then the subsequent binding-supporting network element can determine the relationship with the identity based on the correspondence.
  • the identity of the terminal, the S-NSSAI, and the identity of the policy control network element corresponding to the DNN.
  • a policy control method includes: the mobile management network element determines that the first session of the terminal being established and the established second session of the terminal have the same single network slice selection assistance information S- NSSAI and data network name DNN; the mobile management network element sends a first request message to the first session management network element for creating the first session, the first request message includes the terminal's identity, the S-NSSAI, and the DNN And indication information, the indication information is used to instruct the first session management network element to obtain the identity of the policy control network element from the binding support network element; or, the indication information is used to indicate that the same S with the first session has been established A session of the terminal of the NSSAI and the DNN; or the indication information is used to indicate that the first session has corresponding binding information.
  • the mobile management network element may send a first request message for creating a first session to the first session management network element
  • the first request message includes a terminal identifier, an S-NSSAI And DNN.
  • the first session management network element can obtain the identity of the corresponding policy control network element from the binding support network element according to the instruction information, the S-NSSAI, DNN, and the indication information, so that the first session management network element can obtain the corresponding policy control network element from the binding support network element according to the indication information.
  • selecting the policy control network element according to the identity of the policy control network element, and the policy control network element may be a policy control network element corresponding to the second session.
  • the same policy control network element can be selected for multiple sessions of the same terminal with the same S-NSSAI and DNN, so multiple PDU sessions with the same S-NSSAI and DNN for the same terminal can be avoided.
  • the mobile management network element determines that the first session of the terminal being established and the established second session of the terminal have the same S-NSSAI and DNN, specifically: the mobile management network element according to the terminal Determine at least one of the contract data, the operator policy, and the session establishment request from the terminal, and determine that the first session of the terminal being established and the established second session of the terminal have the same S-NSSAI and DNN.
  • the method before the mobile management network element sends the first request message to the first session management network element, the method further includes: the mobile management network element determines that the terminal is established in a non-roaming or home routing scenario The first conversation.
  • a policy control method includes: the network device determines that the first session of the terminal being established and the established second session of the terminal have the same single network slice selection assistance information S-NSSAI and Data network name DNN; the network device sends the identity of the policy control network element selected by the second session management network element corresponding to the second session to the first session management network element corresponding to the first session, and the identity of the policy control network element is Selecting the policy control network element in the first session management network element.
  • the network device manages the network element to the first session.
  • the identity of the policy control network element selected by the second session management network element corresponding to the second session is sent, so that the second session management network element can select the corresponding policy control network element according to the identity of the policy control network element.
  • the same policy control network element can be selected for multiple sessions of the same terminal with the same S-NSSAI and DNN, so multiple PDU sessions with the same S-NSSAI and DNN for the same terminal can be avoided.
  • the method further includes: during the establishment of the second session, the network device receives an identity of the policy control network element from the second session management network element.
  • the network device is a unified data management network element; the method further includes: during the establishment of the second session, the unified data management network element sends a subscription request for notification of a change in binding information to the unified database network element ;
  • the unified data management network element receives a binding information change notification from the unified database network element, and the binding information change notification includes an identifier of the terminal, an S-NSSAI, and an identity of a policy control network element corresponding to the DNN.
  • the unified data management network element can obtain the identity of the terminal, the S-NSSAI, and the identity of the policy control network element corresponding to the DNN.
  • the method further includes: the network device stores a correspondence between the identity of the terminal, the S-NSSAI, the DNN, and the identity of the policy control network element. In this way, subsequent network devices can determine the identity of the policy control network element corresponding to the identity of the terminal, the S-NSSAI, and the DNN according to the corresponding relationship.
  • the method before the network device sends the identity of the policy control network element to the first session management network element, the method further includes: the network device according to the identity of the terminal, the S-NSSAI, the DNN, and The corresponding relationship determines the identity of the policy control network element.
  • the network device is a unified data management network element; before the network device sends the identity of the policy control network element to the first session management network element, the method further includes: the unified data management network element sends to the unified database network Meta-send request message, the request message includes the identity of the terminal, the S-NSSAI, and the DNN; the unified data management network element receives the identity corresponding to the terminal, the S-NSSAI, and the DNN from the unified database network element Controls the identity of the network element. Based on this solution, the unified data management network element can obtain the identity of the terminal, the S-NSSAI, and the identity of the policy control network element corresponding to the DNN.
  • the method before the network device sends the identity of the policy control network element to the first session management network element, the method further includes: the network device determines that the terminal establishes the first connection under a non-roaming or home routing scenario. A conversation.
  • the network device is a mobile management network element; the network device determines that the first session of the terminal being established and the established second session of the terminal have the same S-NSSAI and DNN, specifically: The mobile management network element determines, according to at least one of the terminal's subscription data, operator policy, and session establishment request from the terminal, that the first session of the terminal being established has the same S-NSSAI and DNN.
  • the network device is a mobile management network element; the method further includes: the mobile management network element sends indication information to the first session management network element, the indication information is used to indicate an identity of the policy control network element
  • the corresponding policy control network element is the policy control network element selected by the session management network element; or, the indication information is used to instruct the first session management network element to select the policy control network element corresponding to the identity of the policy control network element;
  • the indication information is used to indicate that corresponding binding information exists in the first session. In this way, the first session management network element can select the policy control network element corresponding to the identity of the policy control network element according to the instruction information.
  • the network device is a mobile management network element; the method further includes: the mobile management network element carries an identification of the policy control network element in a special field, and the special field is used to indicate the policy control network element
  • the policy control network element corresponding to the identifier is the policy control network element selected by the session management network element.
  • the first session management network element may select a policy control network element corresponding to the identity of the policy control network element according to the field carrying the identity of the policy control network element.
  • the network device is a unified data management network element; before the network device determines that the first session of the terminal being established and the established second session of the terminal have the same S-NSSAI and DNN, the The method further includes: the unified data management network element receives a registration request from the first session management network element, the registration request including an identity of the terminal, the S-NSSAI, and the DNN; and accordingly, the network device determines the The first session has the same S-NSSAI and DNN as the established second session of the terminal. Specifically, the unified data management network element determines the terminal being established according to the terminal's identity, the S-NSSAI, and the DNN. The first session of has the same S-NSSAI and DNN as the established second session of the terminal. Based on this solution, the network device may determine that the first session of the terminal being established and the established second session of the terminal have the same S-NSSAI and DNN.
  • a policy control method includes: a first session management network element receiving a first request message from a mobility management network element for creating a first session, the first request message including an identifier of a terminal; The single network slice selects the auxiliary information S-NSSAI and the data network name DNN; the first session management network element sends a second request message to the binding support network element, the second request message includes the identity of the terminal, the S-NSSAI and The DNN is used to request an identity of a corresponding policy control network element, where the policy control network element is a policy control network element corresponding to a second session, and the second session is an established S-NSSAI and The session of the terminal of the DNN; the first session management network element receives the identity of the policy control network element from the binding support network element, and selects the policy control network element according to the identity of the policy control network element.
  • the mobile management network element may send a first request message for creating a first session to the first session management network element, the first request message includes a terminal identifier, an S-NSSAI And DNN. Further, the first session management network element may obtain the identity of the corresponding policy control network element from the binding support network element according to the identity of the terminal, S-NSSAI, and DNN, and select the policy control network element according to the identity of the policy control network element.
  • the policy control network element may be a policy control network element corresponding to the second session.
  • the same policy control network element can be selected for multiple sessions of the same terminal with the same S-NSSAI and DNN, so multiple PDU sessions with the same S-NSSAI and DNN for the same terminal can be avoided.
  • the first request message further includes indication information
  • the indication information is used to instruct the first session management network element to obtain an identity of the policy control network element from the binding support network element; or, the The indication information is used to indicate that a session of the terminal having the same S-NSSAI and DNN as the first session has been established; or the indication information is used to indicate that the first session has corresponding binding information.
  • the mobile management network element may include indication information in the first request message sent to the first session management network element, so that the first session management network element may Supports network element acquisition policy control network element identification.
  • the method may further include: the first session management network element sends a registration request to the unified data management network element, the The registration request includes an identifier of the terminal, a single network slice selection auxiliary information S-NSSAI corresponding to the first session of the terminal being established, and a data network name DNN; the first session management network element receives instruction information from the unified data management network element, The indication information is used to instruct the first session management network element to obtain the identity of the policy control network element from the binding support network element; or, the indication information is used to indicate that all addresses having the same S-NSSAI and DNN as the first session have been established.
  • the session of the terminal; or the indication information is used to indicate that there is corresponding binding information for the first session; correspondingly, the first session management network element sends a second request message to the binding support network element, including: first session management The network element sends a second request message to the binding support network element according to the instruction information. That is to say, in the embodiment of the present application, when the first session management network element is registered in the unified data management network element for the first session, the first session management network element may obtain the instruction information from the instruction information, The binding supports the network element to obtain the identity of the policy control network element.
  • a policy control method includes: a first session management network element receiving a first request message from a mobility management network element for creating a first session, the first request message including an identifier of a terminal; The single network slice selects the auxiliary information S-NSSAI and the data network name DNN; the first session management network element sends a second request message to the binding support network element, the second request message includes the identity of the terminal, the S-NSSAI And the DNN, for requesting an identity of a corresponding policy control network element, the policy control network element is a policy control network element corresponding to a second session, and the second session is an established S-NSSAI that has the same S-NSSAI as the first session A session with the terminal of the DNN; if the first session management network element determines that it cannot receive the identity of the policy control network element from the binding support network element, the first session management network element provides the mobile management network element according to the local configuration At least one of the identification of the policy control network element or the
  • the first session management network element if the first session management network element cannot obtain the identity of the policy control network element from the binding support network element, other selection methods of the policy control network element may be executed, such as moving according to the local configuration
  • At least one of the identity of the policy control network element provided by the management network element or the identity of the policy control network element provided by the network storage function network element is the first session selection policy control network element, which is not specifically limited in this embodiment of the present application.
  • a policy control method includes: in a process of establishing a second session of a terminal, a second session management network element corresponding to the second session selects a policy control network element; the second session management network The element sends the identity of the policy control network element to the network device, and the identity of the policy control network element is used by the first session management network element to select the policy control network element, and the first session management network element is a session management corresponding to the first session.
  • the first session is a session of the terminal to be established that has the same single network slice selection assistance information S-NSSAI and data network name DNN as the second session.
  • the same policy control network element can be selected for multiple sessions of the same terminal with the same S-NSSAI and DNN, so multiple PDU sessions with the same S-NSSAI and DNN for the same terminal can be avoided.
  • the network device is a mobile management network element or a unified data management network element.
  • the second session is the first session that the second session management network element processes for the terminal with the S-NSSAI and the DNN.
  • the second session management network element receives instruction information from the mobile management network element, and the instruction information is used to indicate that the selection of the network element is preferentially performed by the policy control. For example, after the second session management network element selects the policy control network element, it sends a registration request including the identity of the policy control network element to the unified data management network element.
  • a mobility management network element has a function of implementing the method described in the second aspect above.
  • This function can be realized by hardware, and can also be implemented by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the above functions.
  • a mobile management network element including: a processor and a memory; the memory is configured to store a computer execution instruction, and when the mobile management network element is running, the processor executes the computer execution instruction stored in the memory To enable the mobility management network element to execute the policy control method according to any one of the second aspects.
  • a mobile management network element including: a processor; the processor is configured to be coupled to a memory and read an instruction in the memory, and then execute any one of the foregoing second aspects according to the instruction.
  • the strategy control method is provided, including: a processor; the processor is configured to be coupled to a memory and read an instruction in the memory, and then execute any one of the foregoing second aspects according to the instruction.
  • a computer-readable storage medium stores instructions that, when run on a computer, enable the computer to execute the policy control according to any one of the second aspects. method.
  • a computer program product containing instructions which, when run on a computer, enables the computer to execute the policy control method according to any one of the foregoing second aspects.
  • a device for example, the device may be a chip system
  • the device includes a processor for supporting a mobile management network element to implement the functions involved in the second aspect, for example, determining that The first session of the terminal has the same S-NSSAI and DNN as the established second session of the terminal.
  • the device further includes a memory, which is configured to store program instructions and data necessary for the mobile management network element.
  • the device is a chip system, it may be composed of a chip, or it may include a chip and other discrete devices.
  • the technical effects brought by any one of the design methods in the seventh aspect to the twelfth aspect may refer to the technical effects brought by the different design methods in the second aspect, and will not be repeated here.
  • a network device in a thirteenth aspect, has a function of implementing the method described in the third aspect or the following thirty-fourth aspect.
  • This function can be realized by hardware, and can also be implemented by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the above functions.
  • a network device including: a processor and a memory; the memory is configured to store computer execution instructions, and when the network device is running, the processor executes the computer execution instructions stored in the memory so that The network device executes the policy control method according to any one of the third aspect or the thirty-fourth aspect described below.
  • a network device including: a processor; the processor is configured to be coupled to a memory and read an instruction in the memory, and then execute the third aspect as described above or the third aspect described below according to the instruction.
  • the policy control method according to any one of fourteen aspects.
  • a computer-readable storage medium stores instructions that, when run on a computer, enable the computer to execute the third aspect or the thirty-fourth aspect described below.
  • a computer program product containing instructions which, when run on a computer, enables the computer to execute the policy control method described in the third aspect or any one of the following thirty-fourth aspects .
  • an apparatus for example, the apparatus may be a chip system
  • the apparatus includes a processor, and is configured to support a network device to implement the functions described in the third aspect or the thirty-fourth aspect described below. For example, it is determined that the first session of the terminal being established and the established second session of the terminal have the same S-NSSAI and DNN.
  • the device further includes a memory, and the memory is configured to store program instructions and data necessary for the network device.
  • the device is a chip system, it may be composed of a chip, or it may include a chip and other discrete devices.
  • the technical effects brought by any one of the design methods in the thirteenth aspect to the eighteenth aspect can refer to the technical effects brought by the different design methods in the third aspect or the following thirty-fourth aspect. More details.
  • a first session management network element is provided, and the first session management network element has a function of implementing the method described in the fourth aspect or the fifth aspect.
  • This function can be realized by hardware, and can also be implemented by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the above functions.
  • a first session management network element including: a processor and a memory; the memory is configured to store computer execution instructions, and when the first session management network element is running, the processor executes the memory storage The computer executes instructions to cause the first session management network element to execute the policy control method according to any one of the fourth aspect or the fifth aspect.
  • a first session management network element including: a processor; the processor is configured to be coupled to a memory and read an instruction in the memory, and then execute the fourth aspect as described above according to the instruction. Or the policy control method according to any one of the fifth aspects.
  • a computer-readable storage medium stores instructions that, when run on a computer, enable the computer to execute any one of the fourth or fifth aspects described above. Item described in the policy control method.
  • a computer program product containing instructions which, when run on a computer, enables the computer to execute the policy control method according to any one of the fourth aspect or the fifth aspect.
  • an apparatus for example, the apparatus may be a chip system
  • the apparatus includes a processor, and is configured to support a first session management network element to implement the fourth or fifth aspect.
  • a function for example, selecting the policy control network element according to the identity of the policy control network element.
  • the device further includes a memory, which is configured to store program instructions and data necessary for the first session management network element.
  • the device is a chip system, it may be composed of a chip, or it may include a chip and other discrete devices.
  • a second session management network element is provided, and the second session management network element has a function of implementing the method described in the sixth aspect.
  • This function can be realized by hardware, and can also be implemented by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the above functions.
  • a second session management network element including: a processor and a memory; the memory is configured to store computer execution instructions, and when the second session management network element is running, the processor executes the memory The stored computer executes instructions to cause the second session management network element to execute the policy control method according to any one of the sixth aspects.
  • a second session management network element including: a processor; the processor is configured to be coupled to a memory, and after reading an instruction in the memory, execute the sixth aspect as described above according to the instruction.
  • a computer-readable storage medium stores instructions that, when run on a computer, enable the computer to execute any one of the sixth aspects. Strategy control methods.
  • a computer program product containing instructions which when run on a computer, enables the computer to execute the policy control method according to any one of the sixth aspects.
  • a device for example, the device may be a chip system
  • the device includes a processor, and is configured to support a second session management network element to implement the functions involved in the sixth aspect, for example, determining The first session of the established terminal has the same S-NSSAI and DNN as the second session of the established terminal.
  • the device further includes a memory, which is configured to store program instructions and data necessary for the second session management network element.
  • the device is a chip system, it may be composed of a chip, or it may include a chip and other discrete devices.
  • a policy control system including: a mobility management network element and a first session management network element; a mobility management network element for sending a first session management network element to a first session management network element A request message, the first request message includes a terminal identification, a single network slice selection auxiliary information S-NSSAI, and a data network name DNN; a first session management network element, configured to receive a first request message from a mobile management network element, And sending a second request message to the binding support network element, where the second request message includes the identity of the terminal, S-NSSAI, and DNN; the first session management network element is further configured to receive a policy control network from the binding support network element The identity of the control element is selected according to the identity of the policy control network element.
  • the mobile management network element is further configured to determine that the first session has the same S-NSSAI and DNN as the second session of the established terminal; correspondingly, the first request message further includes indication information, The indication information is used to instruct the first session management network element to obtain an identity of the policy control network element from the binding support network element; or, the indication information is used to indicate that a session of a terminal having the same S-NSSAI and DNN as the first session has been established Or, the indication information is used to indicate that the first session has corresponding binding information.
  • the policy control system further includes a second session management network element; the second session management network element is used to select a policy control network element during the establishment of the second session, and support the binding
  • the network element sends a registration request.
  • the registration request includes the identity of the terminal, S-NSSAI, DNN, and the identity of the policy control network element.
  • a policy control system including a network device and a first session management network element; the network device is used to determine that the first session of the terminal being established and the second session of the established terminal have the same A single network slice selects auxiliary information S-NSSAI and data network name DNN; the network device is further configured to send a policy control network selected by the second session management network element corresponding to the second session to the first session management network element corresponding to the first session Element identification; the first session management network element is configured to receive an identity of a policy control network element from a network device, and select the policy control network element according to the identity of the policy control network element.
  • the policy control system further includes a second session management network element; the second session management network element is used to select a policy control network element during the establishment of the second session, and send it to the network device The policy controls the identity of the network element; the network device is configured to receive the identity of the policy control network element from the second session management network element.
  • a policy control method includes: a first session management network element receiving instruction information from a unified data management network element, the instruction information used to instruct the first session management network element to bind from Support the network element to obtain the identity of the policy control network element; or, the indication information is used to indicate that the terminal of the terminal that has the same single network slice selection auxiliary information S-NSSAI and data network name DNN as the first session of the terminal being established is established.
  • the first session management network element sends a request message to the binding support network element according to the instruction information, the request message includes an identifier of the terminal, the S-NSSAI and the DNN; the first session management network element receives the identity of the policy control network element from the binding support network element, and selects the policy control network element according to the identity of the policy control network element. Based on the policy control method provided in the embodiment of the present application, since the unified data management network element sends instruction information to the first session management network element, the first session management network element can obtain the connection information from the binding support network element according to the instruction information.
  • the identity of the terminal, the identity of the policy control network element corresponding to the S-NSSAI and the DNN, and the policy control network element is selected according to the identity of the policy control network element.
  • the policy control network element may be a policy control network corresponding to the second session. yuan.
  • the same policy control network element can be selected for multiple sessions of the same terminal with the same S-NSSAI and DNN, so multiple PDU sessions with the same S-NSSAI and DNN for the same terminal can be avoided.
  • the method before the first session management network element receives the indication information from the unified data management network element, the method further includes: the unified data management network element determines that the first session of the terminal being established and the established session are The second session of the terminal has the same S-NSSAI and DNN; the unified data management network element sends instruction information to the first session management network element corresponding to the first session.
  • the method further includes: the unified data management network element determines that the terminal establishes a first session in a non-roaming or hometown routing scenario. A conversation.
  • a policy control method includes: a unified data management network element receives a registration request from a first session management network element, the registration request including an identifier of a terminal, a first A single network slice corresponding to a session selects auxiliary information S-NSSAI and data network name DNN; the unified data management network element sends instruction information to the first session management network element, and the instruction information is used to instruct the first session management network element to Support the network element to acquire the identity of the policy control network element; or, the indication information is used to indicate that a session of the terminal having the same S-NSSAI and DNN as the first session has been established; or, the indication information is used to indicate the Corresponding binding information exists in the first session.
  • the method further includes: the unified data management network element determines that the first session of the terminal being established and the established session are The second session of the terminal has the same S-NSSAI and DNN.
  • the method further includes: the unified data management network element determines that the terminal establishes the terminal in a non-roaming or home routing scenario First conversation.
  • a policy control system including: a unified data management network element and a first session management network element; a unified data management network element, configured to send instruction information to the first session management network element, the instruction information It is used to instruct the first session management network element to obtain the identity of the policy control network element from the binding support network element; or, the indication information is used to indicate that the first session of the first session of the terminal being established has the same single network slice selection assistance A session between the information S-NSSAI and the terminal of the data network name DNN; or, the indication information is used to indicate that the first session has corresponding binding information; the first session management network element is configured to receive the data from the unified data management network element.
  • the first session management network element is further configured to receive a request from the binding support
  • the strategy of the network element controls the identity of the network element, and the strategy controls the network element according to the identity of the strategy control network element.
  • the unified data management network element is further configured to determine that the first session of the terminal being established and the second session of the established terminal have the same S-NSSAI and DNN.
  • the unified data management network element is further used to determine that the terminal establishes the first session in a non-roaming or home routing scenario.
  • a policy control system including: a first session management network element and a first policy control network element; a first session management network element for receiving a mobile management network element for creating a first A first request message for a session, the first request message including an identifier of a terminal, a single network slice selection auxiliary information S-NSSAI, and a data network name DNN; a first session management network element is further configured to select a first for the first session
  • the policy control network element sends a policy control creation request to the first policy control network element, where the policy control creation request includes the identity of the terminal, the S-NSSAI, and the DNN; the first policy control network element is configured to receive the A session management network element's policy control creation request, and sends the identification of the terminal, the S-NSSAI, the DNN, and the first policy control network element to the binding support network element; the first policy control network element, and It is used to receive a rejection indication from the binding support network element, and send the rejection indication to
  • a policy control method includes: a first policy control network element receiving a policy control creation request from a first session management management network element, the policy control creation request including an identifier of a terminal, a single The network slice selects the auxiliary information S-NSSAI and the data network name DNN; the first policy control network element sends the identification of the terminal, the S-NSSAI, the DNN, and the first policy control network element to the binding support network element; The first policy control network element receives the identity of the second policy control network element from the binding support network element, and sends the identity of the second policy control network element to the first session management network element, the second policy control network The identity of the element is the identity of the terminal supported by the binding support network element, the identity of the policy control network element corresponding to the S-NSSAI and the DNN.
  • the same policy control network element can be selected for multiple sessions of the same terminal with the same S-NSSAI and DNN, so it can be avoided that the same terminal has the same S-NSSAI
  • the policy control network element may be a network function instance of a policy control function or a network function service instance of a policy control function.
  • the identity of the policy control network element may be the network function instance ID of the policy control network element or the network function service instance ID of the policy control network element, which is not specifically limited herein. .
  • the method further includes: the first policy control network element determines that the same policy control network element needs to be selected for the combination of the terminal's identity, the S-NSSAI, and the DNN; the first policy control network element Send instruction information to the binding support network element, where the instruction information is used to indicate that the same policy control network element is selected for the combination of the identity of the terminal, the S-NSSAI, and the DNN.
  • the binding supporting network element can select the same policy control network element for the combination of the terminal's identity, the S-NSSAI, and the DNN according to the instruction information.
  • a policy control method includes: binding a support network element to receive an identification of a terminal from the first policy control network element, a single network slice selection auxiliary information S-NSSAI, and a data network name DNN And the identity of the first policy control network element; the binding support network element determines that an identity of the second policy control network element corresponding to the combination of the terminal's identity, the S-NSSAI, and the DNN already exists; the binding support network The element sends the identity of the second policy control network element to the first policy control network element.
  • the same policy control network element can be selected for multiple sessions of the same terminal with the same S-NSSAI and DNN, so it can be avoided that the same terminal has the same S-NSSAI
  • the method further includes: during the establishment of the second session, the binding support network element receives the identity of the terminal, the S-NSSAI, the DNN and the The second policy controls the identity of the network element; the binding support network element stores the correspondence between the identity of the terminal, the S-NSSAI, the DNN, and the identity of the second policy control network element.
  • the method further includes: binding the supporting network element to receive instruction information from the first policy control network element, where the instruction information is used to indicate the identity of the terminal, the S-NSSAI, and the DNN
  • the combination selects the same policy control network element; the binding support network element determines to send the identity of the second policy control network element to the first policy control network element according to the instruction information.
  • a policy control method including: a first session management network element sending a policy control creation request to the first policy control network element, the policy control creation request including a terminal identification, a single network slice selection assistance Information S-NSSAI and data network name DNN; the first policy control network element receives the policy control creation request from the first session management network element, and sends the terminal identification, the S-NSSAI to the binding support network element The DNN and the identity of the first policy control network element; the first policy control network element receives the identity of the second policy control network element from the binding support network element, and sends the first policy management network element to the first session management network element The identity of the policy control network element, the identity of the second policy control network element is the identity of the terminal supported by the binding support network element, the identity of the policy control network element corresponding to the S-NSSAI and the DNN; The session management network element receives the identity of the second policy control network element from the first policy control network element, and selects the second policy control for the first
  • the same policy control network element can be selected for multiple sessions of the same terminal with the same S-NSSAI and DNN, so it can be avoided that the same terminal has the same S-NSSAI
  • the method further includes: the first session management network element receives a first request message for creating a first session from the first mobility management network element, the first request message includes an identifier of the terminal , The S-NSSAI and the DNN; the first session management network element selects the first policy control network element for the first session.
  • the method further includes: the first policy control network element determines that the same policy control network element needs to be selected for the combination of the terminal's identity, the S-NSSAI, and the DNN; the first policy control network element Send instruction information to the binding support network element, where the instruction information is used to indicate that the same policy control network element is selected for the combination of the identity of the terminal, the S-NSSAI, and the DNN.
  • the binding supporting network element can select the same policy control network element for the combination of the terminal's identity, the S-NSSAI, and the DNN according to the instruction information.
  • the first policy control network element sends indication information to the binding support network element, including: the first policy control network element establishes the first session of the terminal in a non-roaming or home routing scenario In the case, the instruction information is sent to the binding supporting network element.
  • the method further includes: the second session management network element receiving a second request message for creating a second session from the second mobility management network element, the second request message including an identifier of the terminal The S-NSSAI and the DNN; the second session management network element selects the second policy control network element for the second session, and sends a policy control creation request to the second policy control network element, where the policy control creation request includes The identity of the terminal, the S-NSSAI, and the DNN; the second policy control network element receives the policy control creation request from the second session management network element, and sends the terminal identification, the S-NSSAI, the DNN, and the identity of the second policy control network element; the binding support network element receives the identity of the terminal from the second policy control network element, the S-NSSAI, the DNN, and the second policy control The identity of the network element, and the correspondence between the identity of the terminal, the S-NSSAI, the DNN, and the identity of the second policy control network element is stored.
  • a policy control system including: a first session management network element and a first policy control network element; the first session management network element for sending a policy control to the first policy control network element Creation request, the policy control creation request includes a terminal identification, a single network slice selection auxiliary information S-NSSAI, and a data network name DNN; a first policy control network element for receiving the policy control from the first session management network element Create a request, and send the identification of the terminal, the S-NSSAI, the DNN, and the identification of the first policy control network element to the binding support network element; the first policy control network element is configured to receive the binding support The identity of the second policy control network element of the network element, and sending the identity of the second policy control network element to the first session management network element, where the identity of the second policy control network element is saved by the binding support network element The identity of the terminal, the S-NSSAI, and the identity of the policy control network element corresponding to the DNN; the first session management network element is configured to
  • the first session management network element is further configured to receive a first request message from the first mobile management network element for creating a first session, where the first request message includes an identifier of the terminal, The S-NSSAI and the DNN; the first session management network element is further configured to select the first policy control network element for the first session.
  • the first policy control network element is further used to determine that the same policy control network element needs to be selected for the combination of the identity of the terminal, the S-NSSAI, and the DNN; the first policy control network element, It is also used to send instruction information to the binding support network element, and the instruction information is used to indicate that the same policy control network element is selected for the combination of the terminal's identity, the S-NSSAI, and the DNN.
  • the binding supporting network element can select the same policy control network element for the combination of the terminal's identity, the S-NSSAI, and the DNN according to the instruction information.
  • the first policy control network element is further configured to send indication information to the binding support network element, including: the first policy control network element is further configured to determine whether the terminal is in a non-roaming or hometown In a case where a first session is established in a routing scenario, instruction information is sent to the binding supporting network element.
  • the policy control system further includes a second session management network element, the second policy control network element, and the binding support network element; a second session management network element, configured to receive a second mobile network element A second request message for managing a network element for creating a second session, the second request message including an identifier of the terminal, the S-NSSAI, and the DNN; a second session management network element for selecting the second session
  • the second policy control network element sends a policy control creation request to the second policy control network element, where the policy control creation request includes the identity of the terminal, the S-NSSAI, and the DNN; the second policy control network element uses the Receiving the policy control creation request from the second session management network element, and sending the identification of the terminal, the S-NSSAI, the DNN, and the identification of the second policy control network element to the binding support network element;
  • a support network element for receiving the identity of the terminal from the second policy control network element, the S-NSSAI, the DNN, and the identity of the second policy control network element, and
  • a policy control method includes: a first policy control network element receiving a policy control creation request from a first session management network element, the policy control creation request including an identifier of a terminal, a single network The slice selection auxiliary information S-NSSAI and the data network name DNN; the first policy control network element sends the terminal identification, the S-NSSAI, the DNN, and the first policy control network element to the binding support network element.
  • Policy control network element group identifier the first policy control network element receives a second policy control network element group identifier from the binding support network element, and sends the second policy control network element group identifier to the first session management network element.
  • the second policy control NE group identifier is an identifier of the policy control network element group corresponding to the terminal, the S-NSSAI, and the DNN stored by the binding support network element. Based on the policy control method provided in the embodiment of the present application, the same policy control network element group can be selected for multiple sessions of the same terminal with the same S-NSSAI and DNN, so it can be avoided that the same terminal has the same S- NSSAI and DNN's multiple PDU sessions make conflicts with the policies established by the unified database network elements.
  • the policy control network element group is a network function set of the policy control network element or a network function service set of the policy control network element.
  • the policy control network element group identifier is the network function group identifier (network function group ID) of the policy control network element or the network function service group identifier (network service group ID) of the policy control network element, which is not specifically limited herein.
  • the method further includes: the first policy control network element determines that the same policy control network element group needs to be selected for the combination of the terminal's identity, the S-NSSAI, and the DNN; the first policy control network The element sends instruction information to the binding support network element, and the instruction information is used to indicate that the same policy control network element group is selected for the combination of the identity of the terminal, the S-NSSAI, and the DNN.
  • the binding supporting network element can select the same policy control network element group for the combination of the terminal's identity, the S-NSSAI, and the DNN according to the instruction information.
  • a policy control method includes: binding a supporting network element to receive an identification of a terminal from the first policy control network element, a single network slice selection auxiliary information S-NSSAI, and a data network name DNN And the first policy control network element group identifier to which the first policy control network element belongs; the binding support network element determines that a second policy control network corresponding to the combination of the terminal's identification, the S-NSSAI, and the DNN already exists Tuple identification; the binding support network element sends the second policy control network element identification to the first policy control network element.
  • the same policy control network element group can be selected for multiple sessions of the same terminal with the same S-NSSAI and DNN, so it can be avoided that the same terminal has the same S- NSSAI and DNN's multiple PDU sessions make conflicts with the policies established by the unified database network elements.
  • the method further includes: during the establishment of the second session, the binding support network element receives the identity of the terminal, the S-NSSAI, the DNN, and the second policy control network element.
  • the method further includes: binding the supporting network element to receive instruction information from the first policy control network element, where the instruction information is used to indicate the identity of the terminal, the S-NSSAI, and the DNN The combination selects the same policy control network element group; the binding support network element determines to send the second policy control network element group identifier to the first policy control network element according to the instruction information.
  • a policy control method including: the first session management network element sends a policy control creation request to the first policy control network element, and the policy control creation request includes a terminal identifier and a single network slice selection assistance Information S-NSSAI and data network name DNN; the first policy control network element receives the policy control creation request from the first session management network element, and sends the terminal identification, the S-NSSAI to the binding support network element The DNN and the first policy control network element group identifier to which the first policy control network element belongs; the first policy control network element receives the second policy control network element group identifier from the binding supporting network element, and sends the A session management network element sends the second policy control network element group identifier, and the second policy control network element group identifier is a policy corresponding to the terminal identifier, the S-NSSAI, and the DNN stored by the binding support network element.
  • the first session management network element receives the second policy control network element group identification from the first policy control network element, and according to the second policy control network element group identification, it is the first The session selects a second policy control network element, and the second policy control network element belongs to the second policy control network element group.
  • the same policy control network element group can be selected for multiple sessions of the same terminal with the same S-NSSAI and DNN, so it can be avoided that the same terminal has the same S- NSSAI and DNN's multiple PDU sessions make conflicts with the policies established by the unified database network elements.
  • the method further includes: the first session management network element receives a first request message for creating a first session from the first mobility management network element, the first request message includes an identifier of the terminal , The S-NSSAI and the DNN; the first session management network element selects the first policy control network element for the first session.
  • the method further includes: the first policy control network element determines that the same policy control network element group needs to be selected for the combination of the terminal's identity, the S-NSSAI, and the DNN; the first policy The control network element sends instruction information to the binding support network element, and the instruction information is used to indicate that the same policy control network element group is selected for the combination of the identity of the terminal, the S-NSSAI, and the DNN.
  • the binding supporting network element can select the same policy control network element group for the combination of the terminal's identity, the S-NSSAI, and the DNN according to the instruction information.
  • the first policy control network element sends indication information to the binding support network element, including: the first policy control network element establishes the first session of the terminal in a non-roaming or home routing scenario In the case, the instruction information is sent to the binding supporting network element.
  • the method further includes: the second session management network element receiving a second request message for creating a second session from the second mobility management network element, the second request message including an identifier of the terminal The S-NSSAI and the DNN; the second session management network element selects the second policy control network element for the second session, and sends a policy control creation request to the second policy control network element, where the policy control creation request includes The identity of the terminal, the S-NSSAI, and the DNN; the second policy control network element receives the policy control creation request from the second session management network element, and sends the terminal identification, the S-NSSAI, the DNN, and the second policy control network element group identifier to which the second policy control network element belongs; the binding support network element receives the identifier of the terminal from the second policy control network element, the S-NSSAI, The DNN and the second policy control network element group identifier, and store a correspondence between the terminal's identification, the S-NSSAI, the DNN, and the second policy control network element
  • a policy control system including: a first session management network element and a first policy control network element; a first session management network element for sending a policy control creation to the first policy control network element Request, the policy control creation request includes a terminal identification, a single network slice selection auxiliary information S-NSSAI, and a data network name DNN; a first policy control network element for receiving the policy control creation from the first session management network element Request, and send the terminal identification, the S-NSSAI, the DNN, and the first policy control network element group ID to which the first policy control network element belongs to the binding support network element; the first policy control network element uses After receiving a second policy control NE group identifier from the binding supporting network element, and sending the second policy control NE group identifier to the first session management network element, the second policy control NE group identifier is the Binding support for the identity of the terminal, the S-NSSAI, and the policy control network element group ID corresponding to the DNN saved by the network element;
  • the first session management network element is further configured to receive a first request message from the first mobile management network element for creating a first session, where the first request message includes an identifier of the terminal, The S-NSSAI and the DNN; the first session management network element is further configured to select the first policy control network element for the first session.
  • the first policy control network element is further configured to determine that the same policy control network element group needs to be selected for the combination of the terminal's identity, the S-NSSAI, and the DNN; the first policy control network element; The network element is further configured to send instruction information to the binding-supporting network element, where the instruction information is used to indicate that the same policy control network element group is selected for the combination of the terminal identifier, the S-NSSAI, and the DNN.
  • the binding supporting network element can select the same policy control network element group for the combination of the terminal's identity, the S-NSSAI, and the DNN according to the instruction information.
  • the first policy control network element is further configured to send indication information to the binding support network element, including: the first policy control network element is further configured to determine whether the terminal is in a non-roaming or hometown In a case where a first session is established in a routing scenario, instruction information is sent to the binding supporting network element.
  • the policy control system further includes a second session management network element, the second policy control network element, and the binding support network element; a second session management network element, configured to receive a second mobile network element A second request message for managing a network element for creating a second session, the second request message including an identifier of the terminal, the S-NSSAI, and the DNN; a second session management network element for selecting the second session
  • the second policy control network element sends a policy control creation request to the second policy control network element, where the policy control creation request includes the identity of the terminal, the S-NSSAI, and the DNN; the second policy control network element uses the Receiving the policy control creation request from the second session management network element, and sending the terminal identification, the S-NSSAI, the DNN, and the second policy control network element to the binding support network element Identity of the policy control network element; binding support network element for receiving the identity of the terminal, the S-NSSAI, the DNN, and the identity of the second policy control network element from the second policy control network element, and
  • a communication device for implementing the foregoing methods.
  • the communication device may be the first policy control network element in the thirty-seventh or forty-first aspect, or a device including the first policy control network element; or the communication device may be the thirty-eighth In the aspect or the forty-second aspect, the binding support network element, or the device including the foregoing binding support network element.
  • the communication device includes a corresponding module, unit, or means for implementing the above method.
  • the module, unit, or means can be implemented by hardware, software, or by executing corresponding software by hardware.
  • the hardware or software includes one or more modules or units corresponding to the above functions.
  • a communication device including: a processor and a memory; the memory is configured to store computer instructions, and when the processor executes the instructions, to cause the communication device to execute any one of the foregoing aspects method.
  • the communication device may be the first policy control network element in the thirty-seventh or forty-first aspect, or a device including the first policy control network element; or the communication device may be the thirty-eighth In the aspect or the forty-second aspect, the binding support network element, or the device including the foregoing binding support network element.
  • a communication device including: a processor; the processor is configured to be coupled to a memory and read an instruction in the memory, and then execute the method according to any one of the foregoing aspects according to the instruction.
  • the communication device may be the first policy control network element in the thirty-seventh or forty-first aspect, or a device including the first policy control network element; or the communication device may be the thirty-eighth In the aspect or the forty-second aspect, the binding support network element, or the device including the foregoing binding support network element.
  • a computer-readable storage medium stores instructions that, when run on a computer, enable the computer to execute the method according to any one of the above aspects.
  • a computer program product containing instructions which when run on a computer, enables the computer to execute the method described in any of the above aspects.
  • a communication device for example, the communication device may be a chip or a chip system
  • the communication device includes a processor, and is configured to implement a function involved in any one of the foregoing aspects.
  • the communication device further includes a memory, and the memory is configured to store necessary program instructions and data.
  • the communication device is a chip system, it may be constituted by a chip, or it may include a chip and other discrete devices.
  • the technical effects brought by any one of the design methods in the forty-fifth aspect to the fiftieth aspect can refer to the technical effects brought by the different design methods in the thirty-eighth aspect to the forty-fourth aspect. I will not repeat them here.
  • FIG. 1 is a first schematic architecture diagram of a policy control system according to an embodiment of the present application
  • FIG. 2 is a second schematic architecture diagram of a policy control system according to an embodiment of the present application.
  • FIG. 2a is a third schematic architecture diagram of a policy control system according to an embodiment of the present application.
  • FIG. 2b is a fourth schematic diagram of an architecture of a policy control system according to an embodiment of the present application.
  • 3a is a schematic diagram of an application of a policy control system provided in an embodiment of the present application in a non-roaming 5G network architecture;
  • 3b is a schematic diagram of an application of a policy control system provided in an embodiment of the present application in a hometown routing 5G network architecture;
  • FIG. 4 is a schematic diagram of a hardware structure of a communication device according to an embodiment of the present application.
  • FIG. 5 is a first schematic flowchart of a policy control method according to an embodiment of the present application.
  • FIG. 6 is a second schematic flowchart of a policy control method according to an embodiment of the present application.
  • FIG. 7 is a third flowchart of a policy control method according to an embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of a mobility management network element according to an embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of a network device according to an embodiment of the present application.
  • FIG. 10 is a schematic structural diagram of a first session management network element according to an embodiment of the present application.
  • FIG. 11 is a schematic structural diagram of a second session management network element according to an embodiment of the present application.
  • FIG. 12 is a fourth flowchart of a policy control method according to an embodiment of the present application.
  • FIG. 13 is a schematic flowchart of a policy control method according to an embodiment of the present application.
  • FIG. 14 is a schematic flowchart of a policy control method according to an embodiment of the present application.
  • 15 is a schematic structural diagram of a unified data management network element according to an embodiment of the present application.
  • 16 is a schematic structural diagram of a first policy control network element according to an embodiment of the present application.
  • FIG. 17 is a schematic structural diagram of a binding support network element according to an embodiment of the present application.
  • At least one or more of the following or similar expressions refers to any combination of these items, including any combination of single or plural items.
  • at least one (a), a, b, or c can be expressed as: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple .
  • words such as “first” and “second” are used to distinguish between the same or similar items having substantially the same functions and functions. Those skilled in the art can understand that the words “first”, “second” and the like do not limit the number and execution order, and the words “first” and “second” are not necessarily different.
  • the network architecture and service scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. With the evolution of the network architecture and the emergence of new service scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.
  • the policy control system 10 includes a mobile management network element 101 and a first session management network element 102.
  • the mobility management network element 101 is configured to send a first request message for creating a first session to the first session management network element 102, where the first request message includes an identifier of the terminal, S-NSSAI, and DNN.
  • the first session management network element 102 is configured to receive a first request message from the mobility management network element 101 for creating a first session, and send a second request message to the binding support network element, where the second request message includes a terminal , S-NSSAI and DNN.
  • the first session management network element 102 is further configured to receive an identity of a policy control network element from a binding support network element, and select the policy control network element according to the identity of the policy control network element.
  • the request message is used to request an identity of a corresponding policy control network element
  • the policy control network element may be a policy control network element corresponding to a second session, which is not specifically limited in this embodiment of the present application.
  • the mobile management network element 101 is further configured to determine the first session of the terminal being established and the established terminal before sending the first request message for creating the first session to the first session management network element 102.
  • the second session has the same S-NSSAI and DNN.
  • the first request message further includes indication information, which is used to instruct the first session management network element 102 to obtain an identity of the policy control network element from the binding support network element; or, the indication information is used to indicate that the The first session has a session of a terminal of the same S-NSSAI and DNN.
  • the session in this embodiment of the present application may be, for example, a PDU session, and it is uniformly described herein that this embodiment of the present application does not specifically limit this.
  • the mobile management network element 101 and the first session management network element 102 may communicate directly, or may communicate through forwarding by other devices, which is not specifically limited in this embodiment of the present application.
  • the mobile management network element may send a first request message for creating a first session to the first session management network element
  • the first request message includes a terminal identifier, an S-NSSAI And DNN.
  • the first session management network element may obtain the identity of the corresponding policy control network element from the binding support network element according to the identity of the terminal, S-NSSAI, and DNN, and select the policy control network element according to the identity of the policy control network element.
  • the policy control network element may be a policy control network element corresponding to the second session. In other words, the same policy control network element can be selected for multiple sessions of the same terminal with the same S-NSSAI and DNN. Therefore, multiple PDU sessions with the same S-NSSAI and DNN for the same terminal can be avoided.
  • the policy control system 10 provided in the embodiment of the present application may further include a second session management network element 103.
  • the mobility management network element 101 is further configured to send a third request message for creating a second session to the second session management network element 103.
  • the second session management network element 103 is configured to receive a third request message from the mobile management network element 101 for creating a second session, select a policy control network element, and send a registration request to the binding support network element, where the registration The request includes the identity of the terminal, S-NSSAI, DNN, and the identity of the policy control network element.
  • the mobile management network element 101 and the second session management network element 103 may communicate directly, or may communicate through forwarding by other devices, which is not specifically limited in this embodiment of the present application.
  • the policy control system 20 includes a network device 201 and a first session management network element 202.
  • the network device 201 is configured to determine that the first session of the terminal being established and the second session of the established terminal have the same S-NSSAI and DNN, and then send the second session to the first session management network element 202 corresponding to the first session.
  • the policy selected by the second session management network element corresponding to the session controls the identity of the network element.
  • the first session management network element 202 is configured to receive an identity of a policy control network element from the network device 201, and select a policy control network element according to the identity of the policy control network element.
  • the network device in the embodiment of the present application may be, for example, a unified data management network element or a mobile management network element, which is not specifically limited in this embodiment of the present application.
  • the network device 201 and the first session management network element 202 may communicate directly, or may communicate through the forwarding of other devices, which is not specifically limited in the embodiment of the present application.
  • the network device manages the network element to the first session.
  • the identity of the policy control network element selected by the second session management network element corresponding to the second session is sent, so that the second session management network element can select the corresponding policy control network element according to the identity of the policy control network element.
  • the same policy control network element can be selected for multiple sessions of the same terminal with the same S-NSSAI and DNN, so multiple PDU sessions with the same S-NSSAI and DNN for the same terminal can be avoided.
  • the policy control system 20 provided in the embodiment of the present application may further include a second session management network element 203.
  • the second session management network element 203 is configured to select a policy control network element during the process of establishing the second session, and send an identity of the policy control network element to the network device 201.
  • the network device 201 is configured to receive an identity of a policy control network element from a second session management network element.
  • the network device 201 and the second session management network element 203 may directly communicate with each other, or may communicate through forwarding by other devices, which is not specifically limited in this embodiment of the present application.
  • the policy control system 20a includes a unified data management network element 204 and a first session management network element 205.
  • the unified data management network element 204 is used to determine that the first session of the terminal being established and the second session of the established terminal have the same S-NSSAI and DNN.
  • the unified data management network element 204 is further configured to send instruction information to the first session management network element 205 corresponding to the first session, and the instruction information is used to instruct the first session management network element 205 to obtain the policy control network from the binding support network element.
  • the indication information is used to indicate that a session of a terminal having the same S-NSSAI and DNN as the first session has been established; or the indication information is used to indicate that the first session has corresponding binding information.
  • the first session management network element 205 is configured to receive the instruction information from the unified data management network element 204 and send a request message to the binding support network element according to the instruction information, where the request message includes the identifier of the terminal, the S- NSSAI and the DNN.
  • the first session management network element 205 is further configured to receive an identity of a policy control network element from a binding support network element, and select the policy control network element according to the identity of the policy control network element.
  • the unified data management network element 204 and the first session management network element 205 may communicate directly, or may communicate through forwarding by other devices, which is not specifically limited in this embodiment of the present application.
  • the unified data management network element may report to the first
  • the session management network element sends instruction information, so that the first session management network element can obtain the identifier of the terminal, the identity of the S-NSSAI, and the policy control network element corresponding to the DNN from the binding support network element according to the instruction information.
  • the policy control network element is selected according to the identity of the policy control network element, and the policy control network element may be a policy control network element corresponding to the second session.
  • the same policy control network element can be selected for multiple sessions of the same terminal with the same S-NSSAI and DNN, so multiple PDU sessions with the same S-NSSAI and DNN for the same terminal can be avoided.
  • the policy control system 20b includes a first policy control network element 206 and a first session management network element 207.
  • the first session management network element 207 is configured to receive a first request message for creating a first session from the mobile management network element, where the first request message includes an identifier of the terminal, S -NSSAI and DNN.
  • the first session management network element 207 is further configured to select a first policy control network element 206 for the first session, and send a policy control creation request to the first policy control network element 206, where the policy control creation request includes an identifier of the terminal. , The S-NSSAI, and the DNN.
  • the first policy control network element 206 is configured to receive a policy control creation request from the first session management network element 207 and send the terminal identification, the S-NSSAI, the DNN, and the first policy to the binding support network element. The identity of the control network element 206.
  • the first policy control network element 206 is further configured to receive a rejection indication from the binding support network element and send the rejection indication to the first session management network element 207, where the rejection indication includes an identifier of the terminal, the S-NSSAI, The DNN and the second policy control the identification of the network element.
  • the first session management network element 207 is configured to receive the rejection indication and select the second policy control network element for the first session according to the identity of the second policy control network element.
  • the first session management network element 207 is configured to send a policy control creation request to the first policy control network element 206, where the policy control creation request includes an identifier of the terminal, S-NSSAI, and DNN
  • a first policy control network element 206 configured to receive the policy control creation request from the first session management network element 207, and send an identification of the terminal, the S-NSSAI, the DNN, and the An identification of a first policy control network element
  • a first policy control network element 206 for receiving an identification of a second policy control network element from a binding support network element, and sending the second policy control element 207 to the first session management network element 207
  • the identity of the policy control network element, the identity of the second policy control network element is the identity of the terminal supported by the binding support network element, the identity of the policy control network element corresponding to the S-NSSAI and the DNN
  • the first session The management network element 207 is configured to receive an identity of a second policy control network element from the first policy control network element 206, and select
  • the first session management network element 207 is configured to send a policy control creation request to the first policy control network element 206, where the policy control creation request includes an identifier of the terminal, S-NSSAI, and DNN
  • a first policy control network element 206 configured to receive a policy control creation request from the first session management network element 207, and send the terminal identification, the S-NSSAI, the DNN, and the first policy to the binding support network element
  • the first policy control network element group identifier to which the control network element 206 belongs; the first policy control network element 206 is configured to receive the second policy control network element group identifier from the binding support network element and manage the network element to the first session.
  • a first session management network element 207 for receiving a second policy control network element group identifier from the first policy control network element 206 and selecting a second policy control network for the first session according to the second policy control network element group identifier Yuan, the Two policy control network element belonging to the second group policy control network element.
  • the first policy control network element 206 and the first session management network element 207 may communicate directly, or may communicate through forwarding by other devices, which is not specifically limited in this embodiment of the present application. .
  • the policy control system shown in FIG. 1 or FIG. 2 or FIG. 2 a or FIG. 2 b may be applied to the current 5G network architecture and other network architectures in the future, which are not specifically limited in the embodiments of the present application.
  • the network element or entity corresponding to the first session management network element or the second session management network element may be an SMF network element in the non-roaming 5G network architecture;
  • the network element or entity corresponding to the data management network element may be a unified data management (UDM) network element in the non-roaming 5G network architecture;
  • the network element or entity corresponding to the above mobile management network element may be the AMF network element in a non-roaming 5G network architecture;
  • the network element or entity corresponding to the above binding support network element may be a binding support function (BSF) network element in the non-roaming 5G network architecture.
  • the network element or entity corresponding to the first policy control network element may be a PCF network element in the non-roaming 5G network architecture.
  • the non-roaming 5G network architecture may further include an access device, a user plane function (UPF) network element, or a UDR network element, which is not specifically limited in this embodiment of the application .
  • UPF user plane function
  • the terminal communicates with the AMF network element through the Next Generation Network (N) 1 interface (N1)
  • the access device communicates with the AMF network element through the N2 interface (N2)
  • the access device communicates with the N3 interface (N3) )
  • UPF network elements communicate with UPF network elements.
  • AMF network elements communicate with SMF network elements through the N11 interface (referred to as N11)
  • AMF network elements communicate with UDM network elements through the N8 interface (referred to as N8)
  • SMF network elements communicate with the UDM interface via the N7 interface (referred to as N7).
  • SMF network element communicates with UPF network element through N4 interface (referred to as N4)
  • SMF network element communicates with UDM network element through N10 interface (referred to as N10)
  • UDM network element communicates with UDR network element
  • PCF network element Communication with UDR network elements BSF network elements communicate with PCF network elements and SMF network elements.
  • FIG. 3a is only an example of an SMF network element and a UPF network element.
  • the non-roaming 5G network architecture may include multiple SMF network elements and UPF network elements, such as including SMF1 network elements and SMF2 network elements.
  • SMF1 network elements communicate with UPF1 network elements
  • SMF2 network elements communicate with UPF2 network elements. This embodiment of the present application does not specifically limit this.
  • the policy control system 10 shown in FIG. 1 or the policy control system 20 shown in FIG. 2 or the policy control system 20a shown in FIG. 2a or the policy control system 20b shown in FIG. 2b is applied to the current
  • the home route 5G network architecture as shown in FIG. 3b, the network element or entity corresponding to the first session management network element or the second session management network element may be the home SMF (home) in the home route 5G network architecture.
  • the network element or entity corresponding to the above unified data management network element may be a UDM network element in the hometown routing 5G network architecture; the network element or entity corresponding to the above mobile management network element
  • the AMF network element in the 5G network architecture may be routed for the hometown; the network element or entity corresponding to the binding support network element may be the BSF network element in the hometown routed 5G network architecture; the first policy control network element described above
  • the corresponding network element or entity may be a PCF network element in the hometown routing 5G network architecture.
  • the home router 5G network architecture may further include access devices, visited SMF (V-SMF) network elements, home UPF (H-UPF) network elements, The visited UPF (visited UPF, V-UPF) network element, or UDR network element, etc., is not specifically limited in this embodiment of the present application.
  • the terminal, access device, AMF network element, V-SMF network element and V-UPF network element belong to the visited public land mobile network (VPLMN); UDM network element, UDR network element, The H-SMF network element, PCF network element, H-UPF network element and BSF network element belong to a home public land mobile network (HPLMN).
  • VPN visited public land mobile network
  • HPLMN home public land mobile network
  • the terminal communicates with the AMF network element through N1, the access device communicates with the AMF network element through N2, the access device communicates with the V-UPF network element through N3, and the V-UPF network element communicates through the N9 interface (referred to as N9 )
  • N9 Communicate with H-UPF network elements
  • AMF network elements communicate with V-SMF network elements through N11
  • AMF network elements communicate with UDM network elements through N8
  • V-SMF network elements communicate with H-SMF network through N16 interface (referred to as N16) Element communication
  • H-SMF network element communicates with PCF network element through N7
  • H-SMF network element communicates with H-UPF network element through N4
  • V-SMF network element communicates with V-UPF network element through N4
  • H-SMF network Elements communicate with UDM network elements through N10
  • PCF network elements communicate with UDR network elements
  • BSF network elements communicate with PCF network elements and H-SMF network elements.
  • FIG. 3b only schematically illustrates one V-SMF network element, one H-SMF network element, one H-UPF network element, and one V-UPF network element.
  • the hometown routing 5G network architecture may include multiple V-SMF network elements, multiple H-SMF network elements, multiple V-UPF network elements, and multiple H-UPF network elements, such as including the V-SMF1 network element.
  • H-SMF1 network elements that communicate with V-SMF1 network elements, V-SMF2 network elements, and H-SMF2 network elements that communicate with V-SMF2 network elements, etc., among which, V-SMF1 network element and V-UPF1 network
  • the V-SMF2 network element communicates with the V-UPF2 network element
  • the H-SMF1 network element communicates with the H-UPF1 network element
  • the H-SMF2 network element communicates with the H-UPF2 network element.
  • This embodiment of the present application does not specifically address this. limited.
  • For the connection mode of each network element refer to the home router 5G network architecture shown in FIG. 3b, which will not be described one by one here.
  • each network element in FIG. 3a or FIG. 3b or the interface name between each network element is only an example.
  • the network element name or the interface name may be other names, and this embodiment of the present application does not make this specific. limited.
  • AMF network element SMF network element, H-SMF network element, V-SMF network element in the non-roaming 5G network architecture shown in FIG. 3a or the home route 5G network architecture shown in FIG. 3b
  • Control plane network elements such as UDM network elements, UDR network elements, or PCF network elements may also use service-oriented interfaces for interaction.
  • the external service interface provided by the AMF network element may be Namf; the external service interface provided by the SMF network element may be Nsmf; the external service interface provided by the H-SMF network element may be Nhsmf; the V-SMF network element may provide external service
  • the service-oriented interface provided by the UDM network element can be Nudm; the service-oriented interface provided by the UDM network element can be Nudr; the service-oriented interface provided by the PCF network element can be Npcf; BSF network element
  • the external service interface can be Nbsf.
  • the terminals involved in the embodiments of the present application may include various handheld devices with wireless communication functions, vehicle-mounted devices, wearable devices, computing devices, or other processing devices connected to a wireless modem; Including subscriber unit, cellular phone, smart phone, wireless data card, personal digital assistant (PDA) computer, tablet computer, wireless modem (modem), handheld device (handheld), laptop (computer), cordless phone (wireless local phone) or wireless local loop (WLL) station, machine type communication (MTC) terminal, user equipment (user equipment) , UE), mobile station (MS), terminal device (terminal device) or relay user equipment.
  • the relay user equipment may be, for example, a 5G residential gateway (RG).
  • RG 5G residential gateway
  • the access device referred to in the embodiments of the present application refers to a device that accesses a core network.
  • the access device may be a base station, a broadband network service gateway (BNG), an aggregation switch, or non-third-generation cooperation.
  • BNG broadband network service gateway
  • 3GPP 3rd generation partnership project
  • the base station may include various forms of base stations, such as: macro base stations, micro base stations (also called small stations), relay stations, access points, and the like.
  • the first session management network element, or the first policy control network element or the first session management network element in FIG. 2b may be implemented by one device, may also be implemented by multiple devices, and may also be a functional module in one device.
  • This embodiment of the present application does not specifically limit this. It can be understood that the foregoing functions may be network elements in hardware devices, software functions running on dedicated hardware, or virtualized functions instantiated on a platform (for example, a cloud platform).
  • FIG. 4 is a schematic diagram of a hardware structure of a communication device according to an embodiment of the present application.
  • the communication device 400 includes a processor 401, a communication line 402, a memory 403, and at least one communication interface.
  • the processor 401 may be a general-purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more processors for controlling the execution of the program of the solution of the present application. integrated circuit.
  • CPU central processing unit
  • ASIC application-specific integrated circuit
  • the communication line 402 may include a path for transmitting information between the aforementioned components.
  • the communication interface 404 uses any device such as a transceiver to communicate with other devices or communication networks, such as Ethernet, radio access network (RAN), wireless local area networks (WLAN), etc. .
  • RAN radio access network
  • WLAN wireless local area networks
  • the memory 403 may be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a random access memory (RAM) or other types that can store information and instructions
  • the dynamic storage device can also be electrically erasable programmable read-only memory (EEPROM-ready-only memory (EEPROM)), compact disc (read-only memory (CD-ROM)) or other optical disk storage, optical disk storage (Including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or can be used to carry or store desired program code in the form of instructions or data structures and can be used by a computer Any other media accessed, but not limited to this.
  • the memory may exist independently, and is connected to the processor through the communication line 402. The memory can also be integrated with the processor.
  • the memory 403 is configured to store a computer execution instruction for executing the solution of the present application, and the processor 401 controls execution.
  • the processor 401 is configured to execute computer execution instructions stored in the memory 403, so as to implement the policy control method provided in the following embodiments of the present application.
  • the computer-executable instructions in the embodiments of the present application may also be referred to as application program codes, which are not specifically limited in the embodiments of the present application.
  • the processor 401 may include one or more CPUs, such as CPU0 and CPU1 in FIG. 4.
  • the communication device 400 may include multiple processors, such as the processor 401 and the processor 408 in FIG. 4. Each of these processors may be a single-CPU processor or a multi-CPU processor.
  • a processor herein may refer to one or more devices, circuits, and / or processing cores for processing data (such as computer program instructions).
  • the communication device 400 may further include an output device 405 and an input device 406.
  • the output device 405 communicates with the processor 401 and can display information in a variety of ways.
  • the output device 405 may be a liquid crystal display (LCD), a light emitting diode (LED) display device, a cathode ray tube (CRT) display device, or a projector. Wait.
  • the input device 406 is in communication with the processor 401 and can receive user input in a variety of ways.
  • the input device 406 may be a mouse, a keyboard, a touch screen device, or a sensing device.
  • the above-mentioned communication device 400 may be a general-purpose device or a special-purpose device.
  • the communication device 400 may be a desktop computer, a portable computer, a network server, a personal digital assistant (PDA), a mobile phone, a tablet computer, a wireless terminal device, an embedded device, or a device having a similar structure in FIG. 4. device.
  • PDA personal digital assistant
  • the embodiment of the present application does not limit the type of the communication device 400.
  • the policy control system shown in FIG. 1 or the policy control system shown in FIG. 2a is applied to the non-roaming 5G network architecture shown in FIG. 3a.
  • the first session management network element is an SMF2 network element, and the second session management network element.
  • the element is an SMF1 network element as an example.
  • this embodiment provides a policy control method.
  • the policy control method includes the following steps:
  • the terminal sends a PDU session establishment request (PDU session establishment request) 1 to the AMF network element, so that the AMF network element receives the PDU session establishment request 1 from the terminal.
  • PDU session establishment request PDU session establishment request
  • the PDU session establishment request 1 includes a PDU session identifier 2 for requesting establishment of a second session.
  • the PDU session establishment request 1 in the embodiment of the present application may further include at least one of S-NSSAI or DNN, which is not specifically limited in the embodiment of the present application.
  • the AMF network element may determine the S-NSSAI and DNN corresponding to the second session according to at least one of the subscription data of the terminal, the operator policy, or the PDU session establishment request 1 from the terminal.
  • the AMF network element may determine the S-NSSAI and DNN corresponding to the second session according to the PDU session establishment request 1.
  • the AMF network element may obtain the DNN corresponding to the second session from the terminal's subscription data or operator policy; or, for example, if the PDU session The establishment request 1 includes a DNN, and the AMF network element may obtain the S-NSSAI corresponding to the second session from the terminal's subscription data or the operator policy. That is, the AMF network element may determine the S-NSSAI and DNN corresponding to the second session according to the PDU session establishment request 1 in combination with the terminal's subscription data or operator policy.
  • the AMF network element may obtain the DNN and S- corresponding to the second session from at least one of the subscription data of the terminal or the operator policy.
  • NSSAI that is, the AMF network element may determine the S-NSSAI and DNN corresponding to the second session according to at least one of the subscription data of the terminal or the operator policy.
  • This embodiment of the present application does not limit the manner in which the AMF network element determines the S-NSSAI and DNN corresponding to the second session.
  • the AMF network element selects the SMF1 network element for the second session.
  • the AMF network element may also select a PCF network element for the second session, which is not specifically limited in this embodiment of the present application.
  • the AMF network element selects the SMF1 network element and the PCF network element for the second session, refer to the prior art, and details are not described herein again.
  • the AMF network element sends a creation request message 1 for creating a second session to the SMF1 network element, so that the SMF1 network element receives the creation request message 1 from the AMF network element.
  • the creation request message 1 includes an identifier of the terminal, an S-NSSAI, a DNN, and a PDU session identifier 2.
  • the creation request message 1 may further include an identifier of the PCF network element selected by the AMF network element for the second session, which is expressed as PCF Ida.
  • PCF Ida an identifier of the PCF network element selected by the AMF network element for the second session.
  • the identifier of the terminal may be, for example, a subscriber permanent identifier (SUPI), which is uniformly described herein, and is not specifically limited in this embodiment of the present application.
  • SUPI subscriber permanent identifier
  • the creation request message 1 in the embodiment of the present application may be, for example, a PDU session creation session management (SM) context request (PDU, session creation, SM, context request) message 1.
  • SM PDU session creation session management
  • PDU session creation, SM, context request
  • the S504 and SMF1 network elements are registered in the UDM network element for the second session, and the SMF1 network element obtains the identity of the terminal from the UDM network element, and the session management subscription data corresponding to the combination of DNN and S-NSSAI. .
  • the SMF1 network element may also subscribe to the UDM network element to notify the change of the subscription data, which is not specifically limited in the embodiment of the present application.
  • step S504 For related implementation of step S504, reference may be made to the prior art, and details are not described herein again.
  • the SMF1 network element After the SMF1 network element selects the PCF network element for the second session, it sends a policy control creation request 1 to the PCF network element, so that the PCF network element receives the policy control creation request 1 from the SMF1 network element.
  • the policy control creation request 1 may include an identifier of the terminal, a PDU session identifier 2, a DNN, an S-NSSAI, and an Internet Protocol (IP) address 2 assigned by the SMF1 network element for the second session.
  • IP Internet Protocol
  • the SMF1 network element may interact with the network storage function (NRF) network element according to the local policy, the identity of the PCF network element (PCF IDa) sent by the AMF network element.
  • NRF network storage function
  • PCF IDa the identity of the PCF network element
  • a PCF network element is selected for the second session.
  • the PCF network element sends a query request 1 to the UDR network element, so that the UDR network element receives the query request 1 from the PCF network element.
  • the query request 1 includes the identity of the terminal, S-NSSAI and DNN, which are used to query the subscription information related to the session policy, such as PDU session policy control data (PDU session policy control data), and the remaining maximum allowed data amount (remaining allowed) usage data).
  • PDU session policy control data may include, for example, a contracted guaranteed bit rate (GBR), and the contracted GBR indicates the maximum guaranteed bandwidth that the PCF network element is allowed to authorize to the terminal.
  • the remaining allowable maximum data amount indicates the remaining usage amount that the PCF network element is allowed to authorize to the terminal.
  • the PCF network element may also subscribe to the UDR network element to notify the change of the data. After receiving the subscription request, the UDR network element returns a confirmation message to the PCF network element.
  • the data change here refers to the change of the contract information related to the session policy, which will be described collectively here, and will not be described in detail below.
  • the UDR network element sends a query response 1 to the PCF network element, so that the PCF network element receives the query response 1 from the UDR network element.
  • the query response 1 includes contract information related to the session policy.
  • the PCF network element makes policy decisions based on the obtained contract policy-related contract information, formulates PCC rules and other PDU session-related policies, and sends a policy control creation response (policy control created response) 1 to the SMF1 network element, so that SMF1 The network element receives a policy control creation response 1 from the PCF network element.
  • the policy control creation response includes a session policy formulated by the PCF network element.
  • management registration is performed between the PCF network element and the BSF network element.
  • the PCF network element may send a management registration request (management register request) to the BSF network element, and the management registration request includes the identity of the terminal, DNN, S-NSSAI, and SMF1.
  • a management registration response is sent to the PCF network element.
  • S510 and SMF1 network elements formulate related user plane policies (such as PDR and associated QER, URR, FAR, etc.) according to the received session policy.
  • the SMF1 network element selects the UPF1 network element for the second session, interacts with the UPF1 network element, establishes an N4 session, and sends the formulated user plane execution strategy to the UPF1 network element.
  • related implementation refer to the existing technology. More details.
  • the SMF1 network element sends a creation response message 1 to the AMF network element, so that the AMF network element receives the creation response message 1 from the SMF1 network element.
  • the creation response message 1 includes the IP address 2 and other information allocated by the SMF1 network element for the second session. For details, refer to the existing technology, and details are not described herein again.
  • the creation response message 1 in the embodiment of the present application may be, for example, a PDU session creation SM context response (PDU session creation SM context response message 1), which is not specifically limited in this embodiment of the present application.
  • PDU session creation SM context response message 1 PDU session creation SM context response message 1
  • S512 and the AMF network element interact with the access device or terminal to complete the subsequent establishment process of the second session.
  • the access device or terminal For related implementation, refer to the existing technology, and details are not described herein again.
  • the terminal determines that a first session having the same S-NSSAI and DNN as the second session of the established terminal needs to be established.
  • the terminal may determine that it needs to establish a first session with the same S-NSSAI and DNN as the second session of the established terminal after receiving the network trigger or the own trigger.
  • This application The embodiment does not specifically limit this.
  • the terminal sends a PDU session establishment request 2 to the AMF network element, so that the AMF network element receives the PDU session establishment request 2 from the terminal.
  • the PDU session establishment request 2 includes a PDU session identifier 1 for requesting establishment of a first session.
  • the PDU session establishment request 2 in the embodiment of the present application may further include at least one of S-NSSAI and DNN, which is not specifically limited in the embodiment of the present application.
  • the AMF network element determines the S-NSSAI and DNN corresponding to the first session.
  • the AMF network element determines the S-NSSAI and DNN corresponding to the first session in step S501, and details are not described herein again.
  • the AMF network element selects an SMF2 network element for the first session.
  • the AMF network element may also select a PCF network element for the first session, which is not specifically limited in this embodiment of the present application.
  • the AMF network element selects the SMF1 network element and the PCF network element for the first session.
  • the reason why the AMF network element selects different SMF network elements for different sessions of the terminal may be to consider the load balancing of the SMF network elements and the need to shut down the SMF network elements. Not specifically limited.
  • the AMF network element sends a creation request message 2 for creating a first session to the SMF2 network element, so that the SMF2 network element receives the creation request message 2 from the AMF network element.
  • the creation request message 2 includes an identifier of the terminal, an S-NSSAI, a DNN, and a PDU session identifier 1.
  • the creation request message 2 may further include an identifier of the PCF network element selected by the AMF network element for the first session, which is expressed as PCF Ida.
  • PCF Ida an identifier of the PCF network element selected by the AMF network element for the first session
  • the creation request message 2 may also be Including instruction information, the instruction information is used to instruct the SMF2 network element to obtain the identity of the PCF network element from the BSF network element; or, the instruction information is used to indicate that a session of a terminal having the same S-NSSAI and DNN as the first session has been established Or, the indication information is used to indicate that there is corresponding PCF binding information for the first session, and the PCF binding information is a correspondence between the identifier of the terminal, the S-NSSAI, the DNN, and the identifier of the PCF network element.
  • the SMF2 network element may request the identity of the terminal, the identity of the PCF network element corresponding to the S-NSSAI, and the DNN from the BSF network element, which is not specifically limited in this embodiment of the present application.
  • the AMF network element may carry the foregoing indication information in a creation request message 2 sent to the SMF2 network element.
  • the AMF network element determining that the terminal establishes the first session in a non-roaming scenario may be, for example, the AMF network element determining that the terminal establishing the first session is located in a home network, which is described here in a unified manner, and is not described in detail below.
  • the AMF network element determines that the first session of the terminal being established and the second session of the established terminal have the same S-NSSAI and DNN, which may specifically include: the AMF network element according to the terminal ’s At least one of the subscription data, the operator policy, and the PDU session establishment request 2 from the terminal determines that the first session of the terminal being established and the second session of the established terminal have the same S-NSSAI and DNN.
  • the AMF network element may determine the S-NSSAI and DNN corresponding to the first session according to at least one of the subscription data of the terminal, the operator policy, or the PDU session establishment request 2 from the terminal; further, the AMF network element may The corresponding S-NSSAI and DNN and the corresponding S-NSSAI and DNN of the second session determine that the first session of the terminal being established has the same S-NSSAI and DNN as the second session of the established terminal.
  • the manner in which the AMF network element determines the S-NSSAI and DNN corresponding to the first session according to at least one of the terminal's subscription data, the operator's policy, or the PDU session establishment request 2 from the terminal can refer to the foregoing embodiment, and is not described here. More details.
  • the creation request message 2 in the embodiment of the present application may be, for example, a PDU session creation session management SM context request message 2, which is not specifically limited in the embodiment of the present application.
  • the AMF network element determines that the first session of the terminal being established has the same S-NSSAI and DNN as the second session of the established terminal, and may also be replaced by the AMF network element to determine the first Corresponding PCF binding information exists in the session, and the PCF binding information is the correspondence between the identity of the terminal, the S-NSSAI, the DNN, and the identity of the PCF network element, which is not specifically limited in this embodiment of the present application.
  • S517 and SMF2 network elements are registered in the UDM network element for the first session, and the SMF2 network element obtains the session management contract data corresponding to the terminal identity, DNN and S-NSSAI combination from the UDM network element.
  • the SMF2 network element may also subscribe to the UDM network element to notify the change of the subscription data, which is not specifically limited in the embodiment of the present application.
  • the UDM network element if the UDM network element determines that the first session of the terminal being established and the second session of the established terminal have the same S-NSSAI and DNN, the UDM network element further reports to the SMF2 network element Sending instruction information, the instruction information is used to instruct the SMF2 network element to obtain the identity of the PCF network element from the BSF network element; or, the instruction information is used to indicate that a session of a terminal having the same S-NSSAI and DNN as the first session has been established Or, the indication information is used to indicate that there is corresponding PCF binding information for the first session, and the PCF binding information is a correspondence between the identifier of the terminal, the S-NSSAI, the DNN, and the identifier of the PCF network element. In this way, after receiving the indication information, the SMF2 network element may request the identity of the terminal, the identity of the PCF network element corresponding to the S-NSSAI and DNN from the BSF network element.
  • the UDM network element may determine whether the terminal is in a non- After the first session is established in the roaming scenario, the foregoing indication information is sent to the SMF2 network element, which is not specifically limited in this embodiment of the present application.
  • the UDM network element determining that the terminal establishes the first session in a non-roaming scenario may be, for example, the UDM network element determining that the terminal establishing the first session is located in the home network, which will be described collectively here, and will not be described in detail below.
  • the UDM network element determines that the first session of the terminal being established has the same S-NSSAI and DNN as the second session of the established terminal, and may also be replaced with the first session of the UDM network element There is corresponding PCF binding information, and the PCF binding information is the correspondence between the identifier of the terminal, the S-NSSAI, the DNN, and the identifier of the PCF network element, which is not specifically limited in this embodiment of the present application.
  • step S517 For related implementation of step S517, reference may be made to the prior art, and details are not described herein again.
  • the SMF2 network element sends a management discovery request (management discovery request) to the BSF network element according to the configuration, so that the BSF network element receives the management discovery request from the SMF2 network element.
  • management discovery request management discovery request
  • the management discovery request includes an identifier of the terminal, S-NSSAI, and DNN, and is used to request an identifier of the PCF network element corresponding to the identifier of the terminal, S-NSSAI, and DNN.
  • the BSF network element sends a management discovery response (management discovery response) to the SMF2 network element, so that the SMF2 network element receives the management discovery response from the BSF network element.
  • the management discovery response includes the identity of the terminal, the identity of the PCF network element corresponding to the S-NSSAI, and the DNN.
  • the BSF network element may combine the pre-stored terminal identity, S-NSSAI, DNN, and the correspondence of the PCF network element according to the terminal identifier, S-NSSAI, and DNN carried in the management discovery request. Relationship to determine the identity of the PCF network element corresponding to the identity of the terminal, S-NSSAI, and DNN, which is not specifically limited in this embodiment of the present application.
  • the SMF2 network element may always interact with the BSF network element according to the configuration described above, and try to obtain the identity of the terminal, the identity of the PCF network element corresponding to the S-NSSAI, and the DNN. If there is no session with the terminal with the same DNN and S-NSSAI, the BSF network element does not return any PCF network element identification. At this time, the SMF2 network element can select the PCF network element by other methods, for example, according to the local configuration, the AMF network element
  • the identity of the provided PCF network element or the identity of the PCF network element provided by the NRF network element is a PCF network element, which is not specifically limited in this embodiment of the present application.
  • the SMF2 network element may use the above instruction information
  • the management discovery request is sent to the BSF network element to obtain the identity of the corresponding PCF network element, which is not specifically limited in this embodiment of the present application.
  • S520 and SMF2 network elements send a policy control creation request 2 to the corresponding PCF network element according to the identity of the PCF network element, so that the PCF network element receives the policy control creation request 2 from the SMF2 network element.
  • the policy control creation request 2 may include an identifier of the terminal, a PDU session identifier 1, a DNN, an S-NSSAI, and an IP address 1 assigned by the SMF2 network element for the first session.
  • the PCF network element sends a policy control creation response 2 to the SMF2 network element, so that the SMF2 network element receives the policy control creation response 2 from the PCF network element.
  • the policy control creation response includes a session policy formulated by the PCF network element.
  • S522 and SMF2 network elements formulate policies (such as PDR and associated QER, URR, FAR, etc.) to be executed by the relevant user plane according to the received session policy.
  • the SMF2 network element selects the UPF2 network element for the first session, interacts with the UPF2 network element, establishes an N4 session, and sends the formulated user plane implementation strategy to the UPF2 network element.
  • policies such as PDR and associated QER, URR, FAR, etc.
  • the SMF2 network element sends a creation response message 2 to the AMF network element, so that the AMF network element receives the creation response message 2 from the SMF2 network element.
  • the creation response message 2 includes the IP address 1 and other information allocated by the SMF2 network element for the first session. For details, refer to the existing technology, and details are not described herein again.
  • the creation response message 2 in the embodiment of the present application may be, for example, a PDU session creation SM context response message 2, which is not specifically limited in this embodiment of the present application.
  • the AMF network element interacts with the access device or terminal to complete the subsequent establishment process of the first session.
  • the access device or terminal For related implementation, refer to the existing technology, and details are not described herein again.
  • the same PCF network element can be selected for multiple sessions with the same S-NSSAI and DNN of the same terminal, so it can be avoided that the same S-NSSAI and The problem that the policies formulated by multiple PDU sessions of the DNN conflict with the contract information obtained from the UDR network element.
  • the part of the strategy control system mentioned above please refer to the part of the strategy control system mentioned above, which will not be repeated here.
  • the actions of the AMF network element or the SMF2 network element in the above steps S501 to S524 may be executed by the processor 401 in the communication device 400 shown in FIG. 4 calling the application program code stored in the memory 403. This embodiment deals with this. Without any restrictions.
  • the policy control system shown in FIG. 1 is applied to the home routing 5G network architecture shown in FIG. 3b.
  • the first session management network element is an H-SMF2 network element
  • the second session management network element is an H-SMF1.
  • the network element is taken as an example.
  • a policy control method similar to the embodiment shown in FIG. 5 may be provided. The difference is, for example, that the SMF1 network element in the embodiment shown in FIG. 5 is replaced by the implementation of the present application.
  • the H-SMF1 network element in the example is replaced by the SMF2 network element shown in FIG. 5 as the H-SMF2 network element in the embodiment of the present application
  • the UPF1 network element in the embodiment shown in FIG. 5 is replaced by the implementation of this application.
  • the UPF2 network element in the embodiment shown in FIG. 5 is replaced with the H-UPF2 network element in the embodiment of the present application.
  • the AMF network element needs to select a visiting V-SMF1 network element.
  • Information exchanged between AMF network element and H-SMF1 network element needs to be forwarded through V-SMF1 network element;
  • AMF network element needs to select a visiting V-SMF2 network element (V-SMF1 network element) when selecting H-SMF2 network element. It may be the same or different from the V-SMF2 network element, which is not specifically limited in the embodiment of the present application.
  • the information that the AMF network element interacts with the H-SMF2 network element needs to be forwarded through the V-SMF2 network element.
  • the AMF network element sends a creation request message 1 for creating a second session to the H-SMF1 network element through the V-SMF1 network element, so that the H-SMF1 network element receives the creation request message 1 from the AMF network element;
  • the AMF network The element sends the creation request message 2 for creating the first session to the H-SMF2 network element through the V-SMF2 network element, so that the H-SMF2 network element receives the creation request message 2 from the AMF network element.
  • the H-SMF1 network element and the H-SMF2 network element interact with the UDM network element and register for the second session and the first session, respectively.
  • the creation request message 2 sent by the V-SMF2 network element to the H-SMF2 network element carries indication information, and the indication information is used To instruct the H-SMF2 network element to obtain the identity of the PCF network element from the BSF network element; or, the indication information is used to indicate that a session of a terminal having the same S-NSSAI and DNN as the first session has been established; or, the indication information It is used to indicate that there is corresponding binding information in the first session.
  • the AMF network element determining that the terminal establishes the first session in the hometown routing scenario may be, for example, determining the terminal's hometown routing scenario according to at least one of the terminal's subscription data, operator policy, and PDU session establishment request 2 from the terminal. To establish the first session.
  • the AMF network element determining that the terminal establishes the first session in the hometown routing scenario may be, for example, determining the terminal's hometown routing scenario according to at least one of the terminal's subscription data, operator policy, and PDU session establishment request 2 from the terminal. To establish the first session.
  • the response message of the registration request sent to the H-SMF2 network element carries indication information, and the indication information is used to indicate the H-SMF2
  • the network element obtains the identity of the PCF network element from the BSF network element; or the indication information is used to indicate that a session of a terminal having the same S-NSSAI and DNN as the first session has been established; or the indication information is used to indicate the first Corresponding binding information exists in the session.
  • the UDM network element determining that the terminal establishes the first session in the hometown routing scenario may be, for example, that the UDM network element determines that the H-SMF2 network element requesting registration is an SMF network element located in the home network.
  • the UDM network element determines that the H-SMF2 network element requesting registration is an SMF network element located in the home network.
  • the policy control system shown in FIG. 2 is applied to the 5G network shown in FIG. 3a.
  • the first session management network element is an SMF2 network element
  • the second session management network element is an SMF1 network element
  • the network device is an AMF.
  • a network element is taken as an example.
  • FIG. 6 a policy control method according to an embodiment of the present application is provided. The policy control method includes the following steps:
  • S601-S608 are the same as steps S501-S508 in the embodiment shown in FIG. 5.
  • steps S501-S508 are the same as steps S501-S508 in the embodiment shown in FIG. 5.
  • FIG. 5 For related descriptions, refer to the embodiment shown in FIG. 5, and details are not described herein again.
  • step S609 It is the same as step S510 in the embodiment shown in FIG. 5.
  • step S510 in the embodiment shown in FIG. 5.
  • step S610 is similar to step S511 in the embodiment shown in FIG. 5, and the difference is that, for example, in the embodiment of the present application, the identity of the PCF network element selected by the SMF1 network element for the second session needs to be carried in the creation response message 1.
  • the AMF network element can save the correspondence between the identity of the terminal, the S-NSSAI, the DNN, and the identity of the PCF network element.
  • S611-S614 are the same as steps S512-S515 in the embodiment shown in FIG. 5. For related description, refer to the embodiment shown in FIG. 5, and details are not described herein again.
  • the AMF network element determines that the terminal establishes a first session in a non-roaming scenario.
  • step S516 in the embodiment shown in FIG. 5, and details are not described herein again.
  • the AMF network element determines that the first session of the terminal being established has the same S-NSSAI and DNN as the second session of the established terminal, the AMF network element sends a creation request to the SMF2 network element to create the first session. Message 2, so that the SMF2 network element receives the creation request message 2 from the AMF network element.
  • the creation request message 2 includes the identifier of the terminal, the identifier of the PCF network element selected by the S-NSSAI, DNN, and SMF1 network element for the second session, and the PDU session identifier 1.
  • the AMF network element determines that the first session of the terminal being established has the same S-NSSAI and DNN as the second session of the established terminal, reference may be made to the embodiment shown in FIG. 5, and details are not described herein again.
  • the AMF network element may determine the relationship with the corresponding relationship of the pre-stored terminal identifier, S-NSSAI, DNN, and PCF network element according to the obtained terminal identifier, S-NSSAI, and DNN.
  • the identity of the terminal and the identity of the PCF network element corresponding to the S-NSSAI and DNN, that is, the identity of the PCF network element selected by the SMF1 network element for the second session, are not specifically limited in this embodiment of the present application.
  • the creation request message 2 may further include an identifier of the PCF network element selected by the AMF network element for the first session, which is expressed as PCF Ida.
  • PCF Ida an identifier of the PCF network element selected by the AMF network element for the first session
  • the identifier of the PCF network element selected by the SMF1 network element for the second session is not the identifier of the PCF network element selected by the AMF in the prior art.
  • the SMF1 is carried in a special field in the message.
  • the identifier of the PCF network element selected by the network element for the second session indicates that the identifier of the PCF network element is the PCF network element selected by the SMF network element, which is not specifically limited in this embodiment of the present application.
  • the special field may be an existing field in the message or a newly added field, which is not limited here.
  • the creation request message 2 may carry indication information
  • the instruction information is used to indicate that the PCF network element corresponding to the identifier of the PCF network element is the PCF network element selected by the SMF1 network element; or the instruction information is used to instruct the SMF2 network element to select the PCF network corresponding to the identifier of the PCF network element. This is not specifically limited in the embodiments of the present application.
  • step S617 It is the same as step S517 in the embodiment shown in FIG. 5.
  • step S617 For related description, refer to the embodiment shown in FIG. 5, and details are not described herein again.
  • S618-S622 are the same as steps S520-S524 in the embodiment shown in FIG. 5. For related description, refer to the embodiment shown in FIG. 5, and details are not described herein again.
  • the same PCF network element can be selected for multiple sessions with the same S-NSSAI and DNN of the same terminal, so it can be avoided that the same S-NSSAI and The problem that the policies formulated by multiple PDU sessions of the DNN conflict with the contract information obtained from the UDR network element.
  • the part of the strategy control system mentioned above please refer to the part of the strategy control system mentioned above, which will not be repeated here.
  • the actions of the AMF network element or the SMF2 network element in the above steps S601 to S622 can be executed by the processor 401 in the communication device 400 shown in FIG. 4 calling the application program code stored in the memory 403. This embodiment deals with this. Without any restrictions.
  • the policy control system shown in FIG. 2 is applied to the home routing 5G network architecture shown in FIG. 3b.
  • the first session management network element is the H-SMF2 network element
  • the second session management network element is the H-SMF1.
  • the network element and the network device are AMF network elements as an example.
  • This embodiment of the present application may also provide a policy control method similar to the embodiment shown in FIG. 6. The difference is, for example, that SMF1 in the embodiment shown in FIG. 6 is used.
  • the network element is replaced by the H-SMF1 network element in the embodiment of the present application
  • the SMF2 network element shown in FIG. 6 is replaced by the H-SMF2 network element in the embodiment of the present application
  • the network element is replaced with the H-UPF1 network element in the embodiment of the present application, and the UPF2 network element in the embodiment shown in FIG. 6 is replaced with the H-UPF2 network element in the embodiment of the present application.
  • the AMF network element when selecting the H-SMF1 network element, the AMF network element needs to select a visiting V-SMF1 network element. Information exchanged between AMF network element and H-SMF1 network element needs to be forwarded through V-SMF1 network element; AMF network element needs to select a visiting V-SMF2 network element (V-SMF1 network element) when selecting H-SMF2 network element. It may be the same or different from the V-SMF2 network element, which is not specifically limited in the embodiment of the present application.
  • the information that the AMF network element interacts with the H-SMF2 network element needs to be forwarded through the V-SMF2 network element.
  • the AMF network element sends a creation request message 1 for creating a second session to the H-SMF1 network element through the V-SMF1 network element, so that the H-SMF1 network element receives the creation request message 1 from the AMF network element;
  • the AMF network The element sends the creation request message 2 for creating the first session to the H-SMF2 network element through the V-SMF2 network element, so that the H-SMF2 network element receives the creation request message 2 from the AMF network element.
  • the AMF network element may perform steps similar to step S616 after determining that the terminal establishes the first session in the home routing scenario.
  • the AMF network element determining that the terminal requests to establish the first session in the hometown routing scenario may be, for example, determining the terminal's hometown routing according to at least one of the terminal's subscription data, operator policy, and PDU session establishment request 2 from the terminal.
  • the first session is established in the scenario.
  • the policy control system shown in FIG. 2 is applied to the 5G network shown in FIG. 3a.
  • the first session management network element is an SMF2 network element
  • the second session management network element is an SMF1 network element
  • the network device is a UDM.
  • the network element is taken as an example.
  • this embodiment provides a policy control method.
  • the policy control method includes the following steps:
  • S701-S703 are the same as steps S501-S503 in the embodiment shown in FIG. 5.
  • steps S501-S503 are the same as steps S501-S503 in the embodiment shown in FIG. 5.
  • FIG. 5 For related description, refer to the embodiment shown in FIG. 5, and details are not described herein again.
  • the AMF network element may include indication information in step S703, where the indication information is used to instruct the SMF1 network element to preferentially perform the selection of the PCF network element, which is not specifically limited in this embodiment of the present application.
  • step S704. Similar to step S504 in the embodiment shown in FIG. 5, except that in the embodiment of the present application, SMF1 selects a PCF network element according to the configuration, and when the SMF1 network element registers with the UDM network element, it needs to carry the SMF1 network. The identity of the PCF network element selected by the element for the second session. In this way, the UDM network element can save the correspondence between the identity of the terminal, S-NSSAI, DNN and the identity of the PCF network element. For other related descriptions, reference may be made to the embodiment shown in FIG. 5, and details are not described herein again.
  • the SMF1 network element may perform the selection of the PCF network element first according to the instruction information, and then execute step S704. This embodiment of the present application does not do this. Specific limitations.
  • the request message that the SMF1 network element registers with the UDM network element does not carry the identity of the PCF network element, but the SMF network element is performing the PCF
  • the identifier of the PCF network element that carries the SMF1 network element for the second session is sent to the UDM network element, which is not specifically limited in this embodiment of the present application.
  • S705-S708 are the same as steps S505-S508 in the embodiment shown in FIG. 5.
  • steps S505-S508 are the same as steps S505-S508 in the embodiment shown in FIG. 5.
  • FIG. 5 For related description, refer to the embodiment shown in FIG. 5, and details are not described herein again.
  • S709-S714 are the same as steps S510-S515 in the embodiment shown in FIG. 5.
  • steps S510-S515 in the embodiment shown in FIG. 5.
  • the AMF network element sends a creation request message 2 for creating a first session to the SMF2 network element, so that the SMF2 network element receives the creation request message 2 from the AMF network element.
  • the creation request message 2 includes an identifier of the terminal, an S-NSSAI, a DNN, and a PDU session identifier 1.
  • the creation request message 2 may further include an identifier of the PCF network element selected by the AMF network element for the first session, which is expressed as PCF Ida.
  • PCF Ida an identifier of the PCF network element selected by the AMF network element for the first session
  • step S716 Similar to step S517 in the embodiment shown in FIG. 5, except that, in the embodiment of the present application, when the SMF2 network element registers with the UDM network element, if the UDM network element determines the first session of the terminal being established The second session with the established terminal has the same S-NSSAI and DNN, then the UDM network element may combine the pre-stored terminal identification, S-NSSAI according to the terminal identification, S-NSSAI, and DNN carried in the registration request. , DNN and PCF network element correspondence, determine the identity of the PCF network element corresponding to the identity of the terminal, S-NSSAI and DNN, and then send the identity of the PCF network element to the SMF2 network element, this embodiment of the application is not specific limited.
  • the UDM network element may determine the first session of the terminal being established according to the terminal identifier, S-NSSAI, and DNN carried in the registration request sent when the SMF2 network element registers with the UDM network element.
  • the second session with the established terminal has the same S-NSSAI and DNN, which is not specifically limited in this embodiment of the present application.
  • the UDM network element may send to the SMF2 network element the PCF network element corresponding to the terminal identifier, S-NSSAI, and DNN. Identification, this embodiment of the present application does not specifically limit this.
  • the UDM network element determines that the terminal establishes the first session in a non-roaming scenario.
  • the UDM network element may determine that the SMF2 network element that is requested to be registered is an SMF network element located in the home network, which is described here in a unified manner, and will not be described in detail below. .
  • the UDM network element determines that the first session of the terminal being established has the same S-NSSAI and DNN as the second session of the established terminal, and may also be replaced by the UDM network element to determine the first Corresponding PCF binding information exists in the session, and the PCF binding information is the correspondence between the identity of the terminal, the S-NSSAI, the DNN, and the identity of the PCF network element, which is not specifically limited in this embodiment of the present application.
  • S717-S721 are the same as steps S520-S524 in the embodiment shown in FIG. 5.
  • steps S520-S524 are the same as steps S520-S524 in the embodiment shown in FIG. 5.
  • steps S520-S524 are the same as steps S520-S524 in the embodiment shown in FIG. 5.
  • steps S520-S524 are the same as steps S520-S524 in the embodiment shown in FIG. 5.
  • details are not described herein again.
  • the same PCF network element can be selected for multiple sessions with the same S-NSSAI and DNN of the same terminal, so it can be avoided that the same S-NSSAI and The problem that the policies formulated by multiple PDU sessions of the DNN conflict with the contract information obtained from the UDR network element.
  • the part of the strategy control system mentioned above please refer to the part of the strategy control system mentioned above, which will not be repeated here.
  • the actions of the UDM network element or the SMF2 network element in the above steps S701 to S721 may be executed by the processor 401 in the communication device 400 shown in FIG. 4 calling the application program code stored in the memory 403. This embodiment deals with this. Without any restrictions.
  • the policy control system shown in FIG. 2 is applied to the home routing 5G network architecture shown in FIG. 3b.
  • the first session management network element is the H-SMF2 network element
  • the second session management network element is the H-SMF1.
  • the network element and the network device are UDM network elements as an example.
  • This embodiment of the present application may also provide a policy control method similar to the embodiment shown in FIG. 7. The difference is, for example, that SMF1 in the embodiment shown in FIG. 7 is used.
  • the network element is replaced by the H-SMF1 network element in the embodiment of the present application
  • the SMF2 network element shown in FIG. 7 is replaced by the H-SMF2 network element in the embodiment of the present application
  • the network element is replaced with the H-UPF1 network element in the embodiment of the present application, and the UPF2 network element in the embodiment shown in FIG. 7 is replaced with the H-UPF2 network element in the embodiment of the present application.
  • the AMF network element when selecting the H-SMF1 network element, the AMF network element needs to select a visiting V-SMF1 network element. Information exchanged between AMF network element and H-SMF1 network element needs to be forwarded through V-SMF1 network element; AMF network element needs to select a visiting V-SMF2 network element (V-SMF1 network element) when selecting H-SMF2 network element. It may be the same or different from the V-SMF2 network element, which is not specifically limited in the embodiment of the present application.
  • the information that the AMF network element interacts with the H-SMF2 network element needs to be forwarded through the V-SMF2 network element.
  • the AMF network element sends a creation request message 1 for creating a second session to the H-SMF1 network element through the V-SMF1 network element, so that the H-SMF1 network element receives the creation request message 1 from the AMF network element;
  • the AMF network The element sends the creation request message 2 for creating the first session to the H-SMF2 network element through the V-SMF2 network element, so that the H-SMF2 network element receives the creation request message 2 from the AMF network element.
  • the UDM network element sends the identity of the terminal, the identity of the PCF network element corresponding to S-NSSAI, and DNN to the H-SMF2 network element.
  • the UDM network element determining that the terminal establishes the first session in the hometown routing scenario may be, for example, that the UDM network element determines that the H-SMF2 network element requesting registration is an SMF network element located in the home network.
  • FIG. 7 the policy control system shown in FIG. 2 is applied to the 5G network shown in FIG. 3a and the difference between the home routing 5G network structure shown in FIG. 3b is also applicable to the following FIG. 12 In FIG. 14, the description is unified here, and details are not described below.
  • the policy control system shown in FIG. 2 is applied to the 5G network shown in FIG. 3a.
  • the first session management network element is an SMF2 network element
  • the second session management network element is an SMF1 network element
  • the network device is a UDM.
  • a network element is taken as an example.
  • this embodiment of the present application provides a policy control method.
  • the policy control method includes the following steps:
  • S1201-S1203 are the same as steps S501-S503 in the embodiment shown in FIG. 5.
  • steps S501-S503 are the same as steps S501-S503 in the embodiment shown in FIG. 5.
  • FIG. 5 For related description, refer to the embodiment shown in FIG. 5, and details are not described herein again.
  • the SMF1 network element is registered in the UDM network element for the second session, and the SMF1 network element obtains the terminal identification, the session management contract data corresponding to the combination of DNN and S-NSSAI from the UDM network element.
  • the UDM network element if there is no corresponding session management contract data in the UDM network element, the UDM network element further queries the UDR network element, and the UDR network element returns the identification with the terminal to the UDM network element, DNN and S -The session management contract data corresponding to the NSSAI combination, so that the UDM network element further returns to the SMF1 network element the session management contract data corresponding to the terminal identity, DNN, and S-NSSAI combination.
  • the SMF1 network element may also subscribe to the UDM network element to notify the change of the subscription data.
  • the UDM network element may further subscribe to the UDR network element for notification of a change in contract data.
  • the SMF1 network element may also subscribe to the UDM network element to be notified of the PCF binding information change.
  • the UDM network element may further subscribe to the UDR network element for notification of the PCF binding information change.
  • the PCF binding information is the correspondence between the identity of the terminal, DNN, S-NSSAI, and the identity of the corresponding PCF network element.
  • step S1205. Same as step S505 in the embodiment shown in FIG. 5.
  • step S1205. Same as step S505 in the embodiment shown in FIG. 5.
  • step S1205. same as step S505 in the embodiment shown in FIG. 5.
  • the PCF network element sends a query request 1 to the UDR network element, so that the UDR network element receives the query request 1 from the PCF network element.
  • the query request 1 carries the identity of the terminal, S-NSSAI and DNN, and is used to query the contract information related to the session policy.
  • the subscription information related to the session policy reference may be made to step S506 in the embodiment shown in FIG. 5, and details are not described herein again.
  • the query request 1 carries the identifier of the PCF network element selected by the SMF1 network element for the second session.
  • the PCF network element may also subscribe to the UDR network element to notify the change of the data, and after receiving the subscription request, the UDR network element returns a confirmation message.
  • the UDR network element sends a query response 1 to the PCF network element, so that the PCF network element receives the query response 1 from the UDR network element.
  • the query response 1 carries the contract information related to the identity of the terminal, the session policy corresponding to the combination of DNN and S-NSSAI.
  • the UDR network element obtains the identity of the PCF network element selected by the SMF1 network element for the second session, the identity of the terminal, the correspondence between DNN, S-NSSAI, and the identity of the PCF network element, that is, Save PCF binding information.
  • step S1208 It is the same as step S508 in the embodiment shown in FIG. 5. For related description, refer to the embodiment shown in FIG. 5, and details are not described herein again.
  • Steps S1209-S1214 are the same as steps S510-515 in the embodiment shown in FIG. 5. For related description, refer to the embodiment shown in FIG. 5, and details are not described herein again.
  • the AMF network element sends a creation request message 2 for creating a first session to the SMF2 network element, so that the SMF2 network element receives the creation request message 2 from the AMF network element.
  • the creation request message 2 includes an identifier of the terminal, an S-NSSAI, a DNN, and a PDU session identifier 1.
  • the creation request message 2 may further include an identifier of the PCF network element selected by the AMF network element for the first session, which is expressed as PCF Ida.
  • PCF Ida an identifier of the PCF network element selected by the AMF network element for the first session
  • S1216 and SMF2 network elements are registered in the UDM network element for the first session, and the SMF2 network element obtains from the UDM network element the identifier of the terminal and the session management contract data corresponding to the combination of DNN and S-NSSAI.
  • the UDM network element may also return PCF binding information to the SMF2 network element, where the PCF binding information is the identifier of the terminal, Correspondence between the IDs of the PCF network elements selected by the DNN, S-NSSAI, and SMF1 network elements.
  • the UDM network element may obtain the PCF binding information in the following manner: If the UDM network element determines that there are other SMF network elements (that is, the SMF1 network element) as having the terminal ID, DNN, and S-NSSAI After the PDU session is registered, the UDM network element sends a query request 2 to the UDR network element.
  • the query request 2 includes the terminal identifier, DNN, and S-NSSAI to request to obtain the PCF binding information. Further, the UDR network element sends the PCF binding information to the UDM network element, and the UDM network element receives the PCF binding information.
  • the UDM network element may obtain the PCF binding information in the following manner: If the PCF binding information change notification is subscribed in step S1204, then in step S1207, the UDR network element saves the terminal After the correspondence between the identifier of DNN, S-NSSAI and the identity of the PCF network element, the UDR network element sends a PCF binding information change notification to the UDM network element, and the PCF binding information change notification carries the PCF binding information. Further, the UDM network element receives the PCF binding information.
  • S1217-S1221 are the same as steps S520-S524 in the embodiment shown in FIG. 5.
  • steps S520-S524 are the same as steps S520-S524 in the embodiment shown in FIG. 5.
  • steps S520-S524 are the same as steps S520-S524 in the embodiment shown in FIG. 5.
  • FIG. 5 For related description, refer to the embodiment shown in FIG. 5, and details are not described herein again.
  • the same PCF network element can be selected for multiple sessions with the same S-NSSAI and DNN of the same terminal, so it can be avoided that the same S-NSSAI and The problem that the policies formulated by multiple PDU sessions of the DNN conflict with the contract information obtained from the UDR network element.
  • the part of the strategy control system mentioned above please refer to the part of the strategy control system mentioned above, which will not be repeated here.
  • the actions of the UDM network element or the SMF2 network element in the above steps S1201 to S1221 can be executed by the processor 401 in the communication device 400 shown in FIG. 4 calling the application program code stored in the memory 403. This embodiment deals with this. Without any restrictions.
  • the policy control system shown in FIG. 2 is applied to the 5G network shown in FIG. 3a.
  • the first session management network element is an SMF2 network element
  • the second session management network element is an SMF1 network element
  • the network device is a UDM.
  • the network element is taken as an example.
  • this embodiment provides a policy control method.
  • the policy control method includes the following steps:
  • S1301-S1303 are the same as steps S501-S503 in the embodiment shown in FIG. 5.
  • steps S501-S503 are the same as steps S501-S503 in the embodiment shown in FIG. 5.
  • steps S501-S503 are the same as steps S501-S503 in the embodiment shown in FIG. 5.
  • details are not described herein again.
  • S1304-S1305 are the same as steps S804-S805 in the embodiment shown in FIG. 8. For related description, refer to the embodiment shown in FIG. 5, and details are not described herein again.
  • S1306-S1309 are the same as steps S506-S509 in the embodiment shown in FIG. 5.
  • steps S506-S509 are the same as steps S506-S509 in the embodiment shown in FIG. 5.
  • FIG. 5 For related description, refer to the embodiment shown in FIG. 5, and details are not described herein again.
  • the BSF network element sends a data update request message to the UDR network element, so that the UDR network element receives the data update request message from the BSF network element.
  • the data update request message includes PCF binding information, where the PCF binding information is a correspondence between a terminal identifier, a DNN, an S-NSSAI, and a PCF network element identifier. After the UDR network element obtains the PCF binding information, it saves the PCF binding information.
  • S1311-S1316 are the same as steps S510-515 in the embodiment shown in FIG. 5. For related description, refer to the embodiment shown in FIG. 5, and details are not described herein again.
  • the AMF network element sends a creation request message 2 for creating a first session to the SMF2 network element, so that the SMF2 network element receives the creation request message 2 from the AMF network element.
  • the creation request message 2 includes an identifier of the terminal, an S-NSSAI, a DNN, and a PDU session identifier 1.
  • the creation request message 2 may further include an identifier of the PCF network element selected by the AMF network element for the first session, which is expressed as PCF Ida.
  • PCF Ida an identifier of the PCF network element selected by the AMF network element for the first session
  • step S1318 similar to step S1216 in the embodiment shown in FIG. 12, except that in the embodiment of the present application, in step S1310, the UDR network element includes the PCF binding information.
  • the UDR network element includes the PCF binding information.
  • S1319-S1323 are the same as steps S520-S524 in the embodiment shown in FIG. 5.
  • steps S520-S524 are the same as steps S520-S524 in the embodiment shown in FIG. 5.
  • steps S520-S524 are the same as steps S520-S524 in the embodiment shown in FIG. 5.
  • the same PCF network element can be selected for multiple sessions with the same S-NSSAI and DNN of the same terminal, so it can be avoided that the same S-NSSAI and The problem that the policies formulated by multiple PDU sessions of the DNN conflict with the contract information obtained from the UDR network element.
  • the part of the strategy control system mentioned above please refer to the part of the strategy control system mentioned above, which will not be repeated here.
  • the actions of the UDM network element or SMF2 network element in the above steps S1301 to S1323 can be executed by the processor 401 in the communication device 400 shown in FIG. 4 calling the application program code stored in the memory 403. This embodiment deals with this. Without any restrictions.
  • the policy control system shown in FIG. 2b is applied to the 5G network shown in FIG. 3a.
  • the first session management network element is an SMF2 network element
  • the second session management network element is an SMF1 network element
  • the network device is a UDM.
  • the network element is taken as an example.
  • this embodiment of the present application provides a policy control method.
  • the policy control method includes the following steps:
  • S1401-S1417 are the same as steps S501-S517 in the embodiment shown in FIG. 5.
  • steps S501-S517 are the same as steps S501-S517 in the embodiment shown in FIG. 5.
  • FIG. 5 For related description, refer to the embodiment shown in FIG. 5, and details are not described herein again.
  • the SMF2 network element selects the PCFx network element for the first session, it sends a policy control creation request 2 to the PCFx network element, so that the PCFx network element receives the policy control creation request 2 from the SMF2 network element.
  • the policy control creation request 2 may include an identifier of the terminal, a PDU session identifier 2, a DNN, an S-NSSAI, and an IP address 1 allocated by the SMF2 network element for the first session.
  • the SMF2 network element may select the PCFx network for the first session according to the local policy, the identity of the PCF network element (PCF IDa here) sent by the AMF network element, or interaction with the NRF network element.
  • PCF IDa the identity of the PCF network element sent by the AMF network element
  • interaction with the NRF network element please refer to the existing implementation manner, which will not be repeated here.
  • management registration is performed between the PCFx network element and the BSF network element.
  • the PCFx network element may send a management registration request to the BSF network element.
  • the management registration request includes the identity of the terminal, the DNN, S-NSSAI, and SMF2 network element.
  • the BSF network element determines that the identity of the PCF network element (that is, the SMF1 network element and the PCF network element selected by the second session) corresponding to the terminal identity, DNN, and S-NSSAI already exists.
  • the BSF network element returns a refusal indication to the PCFx, and the refusal indication carries the identity of the terminal, the identity of the PCF network element corresponding to the DNN and the S-NSSAI.
  • the PCFx network element sends the foregoing rejection instruction to the SMF2 network element, so that the SMF2 network element receives the rejection instruction from the PCFx network element.
  • SMF2 sends a policy control creation request 3 to a PCF network element corresponding to the identity of the PCF network element, so that the PCF network element receives the policy control creation request 3 from the SMF1 network element.
  • management registration is performed between the PCF network element and the BSF network element.
  • the PCF network element may send a management registration request to the BSF network element.
  • the management registration request includes the identity of the terminal, the DNN, S-NSSAI, and the identity of the PCF network element selected by the SMF1 network element for the second session and the SMF2 network element. IP address 1 assigned for the first session.
  • the BSF network element saves the correspondence between the terminal's identity, DNN, S-NSSAI, PCF network element's identity, and IP address 1, it sends a management registration response to the PCF network element.
  • S1423-S1426 are the same as steps S521-524 in the embodiment shown in FIG. 5.
  • steps S521-524 in the embodiment shown in FIG. 5.
  • details are not described herein again.
  • the same PCF network element can be selected for multiple sessions with the same S-NSSAI and DNN of the same terminal, so it can be avoided that the same S-NSSAI and The problem that the policies formulated by multiple PDU sessions of the DNN conflict with the contract information obtained from the UDR network element.
  • the part of the strategy control system mentioned above please refer to the part of the strategy control system mentioned above, which will not be repeated here.
  • the policy control system shown in FIG. 2b is applied to the 5G network shown in FIG. 3a.
  • the first session management network element is an SMF2 network element
  • the second session management network element is an SMF1 network element
  • the network device is taken as an example.
  • this embodiment of the present application provides a policy control method.
  • the policy control method includes the following steps:
  • S1401-S1408 are the same as steps S501-S508 in the embodiment shown in FIG. 5.
  • steps S501-S508 are the same as steps S501-S508 in the embodiment shown in FIG. 5.
  • FIG. 5 For related description, refer to the embodiment shown in FIG. 5, and details are not described herein again.
  • management registration is performed between the PCF network element and the BSF network element.
  • the PCF network element may send a management registration request (management register request) to the BSF network element, and the management registration request includes the identity of the terminal, DNN, S-NSSAI, and SMF1. The identifier and the IP address 2 allocated by the SMF1 network element for the second session. Further, after the BSF network element stores the correspondence between the terminal identification, DNN, S-NSSAI, PCF network element identification, and IP address 2, a management registration response (management register response) is sent to the PCF network element.
  • the PCF network element may be a PCF network function instance (PCF network function instance) or a PCF network function service instance (PCF network function service instance).
  • the identifier of the PCF network element may be the network function instance identifier (network instance identifier) of the PCF network element or the network function service instance identifier (Id) of the PCF network element, which is not specifically limited herein.
  • the SMF1 network element may also include the identity of the terminal, the DNN, S-NSSAI, and the SMF1 network element as the PCF network selected for the second session in the management registration request.
  • the identity of the element (optional), the identity of the PCF network element group 1 to which the PCF network element selected by the SMF1 network element for the second session belongs, and the IP address 2 allocated by the SMF1 network element for the second session.
  • the BSF network element stores the correspondence between the terminal identification, DNN, S-NSSAI, PCF network element identification (optional), PCF network element group identification 1 and IP address 2
  • the management registration response is sent to the PCF network element. .
  • a PCF network element group usually includes multiple PCF network elements, and the multiple PCF network elements share an unstructured data storage function (UDSF) network element.
  • the UDSF network element can ensure that the contract data allocated to different PCF network elements does not conflict.
  • the PCF network element group is a network function set of the PCF network element or a network function service set of the PCF network element.
  • the identity of the PCF network element group is the network function group identifier (network ID) of the PCF network element or the network function service group ID of the PCF network element, which is not specifically limited herein.
  • the PCF network element may also be based on the operator's policy, configuration, and / or user subscription (for example, the user subscription indicates that the usage monitoring is to be applied For the user, the user signing up is obtained in step 1407) It is determined that the same PCF network element is to be selected for the terminal identification, DNN, S-NSSAI combination.
  • the PCF network element also carries an instruction for selecting the same PCF network element in the management registration request message sent to the BSF network element. However, because the BSF network element does not yet have the binding relationship corresponding to the terminal identification, DNN, and S-NSSAI combination, the BSF network element returns a successful response to the PCF network element.
  • the management registration request message carries an instruction for selecting the same PCF network element.
  • the PCF network element may also be based on the operator policy, configuration, and / or user subscription (for example, the user subscription indicates that usage monitoring is to be applied to the user, The user signing up is obtained in step 1407) It is determined that the same PCF network element group is to be selected for the terminal identification, DNN, S-NSSAI combination.
  • the PCF network element also carries an instruction for selecting the same PCF network element group in the management registration request message sent to the BSF network element. However, because the BSF network element does not yet have the binding relationship corresponding to the terminal identification, DNN, and S-NSSAI combination, the BSF network element returns a successful response to the PCF network element.
  • the management registration request message carries an instruction for selecting the same PCF network element group.
  • S1410-S1417 are the same as steps S510-S517 in the embodiment shown in FIG. 5. For related description, refer to the embodiment shown in FIG. 5, and details are not described herein again.
  • the AMF network element in step S1414 and the AMF network element in step 1401 may be the same or different.
  • the embodiment of the present application is only exemplary by using the same AMF network element as an example. Description, here unified description, will not repeat them below.
  • the SMF2 network element selects the PCFx network element for the first session, it sends a policy control creation request 2 to the PCFx network element, so that the PCFx network element receives the policy control creation request 2 from the SMF2 network element.
  • the policy control creation request 2 may include an identifier of the terminal, a PDU session identifier 2, a DNN, an S-NSSAI, and an IP address 1 allocated by the SMF2 network element for the first session.
  • the SMF2 network element may select the PCFx network for the first session according to the local policy, the identity of the PCF network element (PCF IDa here) sent by the AMF network element, or interaction with the NRF network element.
  • PCF IDa the identity of the PCF network element sent by the AMF network element
  • interaction with the NRF network element please refer to the existing implementation manner, which will not be repeated here.
  • management registration is performed between the PCFx network element and the BSF network element.
  • the PCFx network element may send a management registration request to the BSF network element.
  • the management registration request includes the identity of the terminal, the DNN, S-NSSAI, and SMF2 network element.
  • the BSF network element determines that the identity of the PCF network element (that is, the PCF network element selected by the SMF1 network element for the second session) corresponding to the terminal identity, DNN, and S-NSSAI, then, The BSF network element returns a refusal instruction to the PCFx network element, and the refusal instruction carries the identity of the terminal, the identity of the PCF network element corresponding to the DNN and the S-NSSAI.
  • the SMF2 network element may also include the identity of the terminal, the DNN, S-NSSAI, and SMF2 network element PCFx selected for the first session in the management registration request.
  • the identity of the network element (optional), the identity of the PCF network element group 2 to which the PCFx network element selected by the SMF2 network element for the first session, and the IP address 1 allocated by the SMF2 network element for the first session.
  • the BSF network element determines that a PCF network element group identifier corresponding to the terminal identifier, DNN, and S-NSSAI already exists (that is, the PCF network element group identifier 1 selected by the SMF1 network element for the second session). ), The BSF network element returns a refusal indication to the PCFx network element, and the refusal indication carries the identity of the PCF network element group 1 corresponding to the identity of the terminal, DNN, and S-NSSAI.
  • the PCFx network element may also be based on the operator's policy, configuration, and / or user subscription (for example, the user subscription indicates that usage monitoring is to be applied For this user, the user signs a contract and obtains the interaction between PCFx and UDR.) It is determined that the same PCF network element is selected for the terminal identification, DNN, and S-NSSAI combination. Then, the management registration request message sent by the PCFx network element to the BSF network element also carries an instruction for selecting the same PCF network element.
  • the BSF network element selects the same PCF network element according to the received instruction, and the BSF network element already has the binding relationship corresponding to the terminal identification, DNN, and S-NSSAI combination (the binding relationship registered in step 1409), Therefore, the BSF network element returns a refusal instruction to the PCFx network element, and the refusal instruction carries the identity of the terminal, the identity of the PCF network element corresponding to the DNN and the S-NSSAI.
  • the management registration request message carries an instruction for selecting the same PCF network element.
  • the PCFx network element may also be based on the operator's policy, configuration, and / or user subscription (such as The user signing indicates that the usage monitoring should be applied to the user, and the user signing up is obtained by interacting with the PCFx and UDR.) It is determined that the same PCF network element group is selected for the terminal identification, DNN, and S-NSSAI combination. Then, the management registration request message sent by the PCFx network element to the BSF network element also carries an instruction for selecting the same PCF network element group.
  • the BSF network element selects the same PCF network element group according to the received instruction, and the BSF network element already has the binding relationship corresponding to the terminal identification, DNN, and S-NSSAI combination (the binding relationship registered in step 1409) Therefore, the BSF network element returns a refusal instruction to the PCFx network element, and the refusal instruction carries the identity of the PCF network element group 1 corresponding to the identity of the terminal, DNN, and S-NSSAI.
  • the management registration request message carries an instruction for selecting the same PCF network element group.
  • the refusal indication may be expressed by carrying the identity of the PCF network element; or by carrying a refusal HyperText Transfer Protocol (HTTP) status code and the identity of the PCF network element, It is unified here and will not be described in detail below.
  • HTTP HyperText Transfer Protocol
  • the refusal indication may be indicated by carrying a PCF network element identifier; or by carrying a rejected HyperText transfer protocol (HTTP) status code and It is indicated by the identity of the PCF network element group, which is described here in a unified manner and will not be described in detail below.
  • HTTP HyperText transfer protocol
  • the PCFx network element sends the foregoing rejection instruction to the SMF2 network element, so that the SMF2 network element receives the rejection instruction from the PCFx network element.
  • the SMF2 network element sends a policy control creation request 3 to the PCF network element corresponding to the identity of the PCF network element, so that the PCF network element receives the policy control creation request 3 from the SMF2 network element.
  • the SMF2 network element selects a PCF network element in the PCF network element group identifier 1 and sends a policy control creation request 3 to the PCF network element, so that the The PCF network element receives a policy control creation request 3 from the SMF2 network element.
  • the SMF2 network element interacts with the PCFx network element to terminate the policy association established in step S1418.
  • management registration is performed between the PCF network element and the BSF network element.
  • the PCF network element may send a management registration request to the BSF network element.
  • the management registration request includes the identity of the terminal, the DNN, S-NSSAI, and the identity of the PCF network element selected by the SMF1 network element for the second session and the SMF2 network element. IP address 1 assigned for the first session.
  • the BSF network element saves the correspondence between the terminal's identity, DNN, S-NSSAI, PCF network element's identity, and IP address 1, it sends a management registration response to the PCF network element.
  • the PCF network element may send a management registration request to the BSF network element, and the management registration request includes a terminal identifier, DNN, S-NSSAI, and SMF2 network elements selected for the first session.
  • the identity of the PCF network element (optional), the group identity to which the PCF network element belongs, and the IP address 1 assigned by the SMF2 network element to the first session.
  • the BSF network element stores the correspondence between the terminal identity, DNN, S-NSSAI, PCF network element identity (optional), PCF network element group identity, and IP address 1
  • a management registration response is sent to the PCF network element.
  • S1423-S1426 are the same as steps S521-524 in the embodiment shown in FIG. 5.
  • steps S521-524 in the embodiment shown in FIG. 5.
  • details are not described herein again.
  • the same PCF network element or the same PCF network element group can be selected for multiple sessions with the same S-NSSAI and DNN of the same terminal, so it can be avoided for the same terminal.
  • the part of the strategy control system mentioned above please refer to the part of the strategy control system mentioned above, which will not be repeated here.
  • the actions of the BSF network element or the SMF2 network element in the above steps S1401 to S1426 can be executed by the processor 401 in the communication device 400 shown in FIG. 4 calling the application program code stored in the memory 403. This embodiment deals with this. Without any restrictions.
  • functional modules may be divided according to the foregoing method examples for a mobile management network element, a network device, a first session management network element or a second session management network element, or a first policy control network element or a binding support network element.
  • each function module may be divided corresponding to each function, or two or more functions may be integrated into one processing module.
  • the above integrated modules may be implemented in the form of hardware or software functional modules. It should be noted that the division of the modules in the embodiments of the present application is schematic, and is only a logical function division. In actual implementation, there may be another division manner.
  • FIG. 8 shows a schematic structural diagram of a mobility management network element 80.
  • the mobility management network element 80 includes a processing module 801 and a transceiver module 802.
  • the processing module 801 is configured to determine that the first session of the terminal being established and the second session of the established terminal have the same S-NSSAI and DNN.
  • the transceiver module 802 is configured to send a first request message for creating a first session to a first session management network element, where the first request message includes a terminal identifier, S-NSSAI, DNN, and indication information, and the indication information is used to indicate the first
  • a session management network element obtains the identity of the policy control network element from the binding support network element; or, the indication information is used to indicate that a session of a terminal having the same S-NSSAI and DNN as the first session has been established; or, the indication information It is used to indicate that there is corresponding binding information in the first session.
  • the processing module 801 is specifically configured to determine a first session of the terminal being established and a second session of the established terminal according to at least one of the terminal's subscription data, operator policy, and session establishment request from the terminal. Have the same S-NSSAI and DNN.
  • the processing module 801 is further configured to determine that the terminal establishes a first session in a non-roaming or home routing scenario.
  • the mobility management network element 80 is presented in the form of dividing each functional module in an integrated manner.
  • the "module” herein may refer to a specific ASIC, a circuit, a processor and a memory executing one or more software or firmware programs, an integrated logic circuit, and / or other devices that can provide the above functions.
  • the mobility management network element 80 may adopt the form shown in FIG. 4.
  • the processor 401 in FIG. 4 may cause the mobile management network element 80 to execute the policy control method in the foregoing method embodiment by calling a computer execution instruction stored in the memory 403.
  • the function / implementation process of the transceiver module 802 and the processing module 801 in FIG. 8 may be implemented by the processor 401 in FIG. 4 calling a computer execution instruction stored in the memory 403.
  • the function / implementation process of the processing module 801 in FIG. 8 may be implemented by the processor 401 in FIG. 4 calling a computer execution instruction stored in the memory 403, and the function / implementation process of the transceiver module 802 in FIG. 8 may be performed through the graph.
  • the communication interface 404 in 4 is implemented.
  • the mobile management network element 80 provided in this embodiment can execute the foregoing policy control method, the technical effects that can be obtained can refer to the foregoing method embodiments, and details are not described herein again.
  • an embodiment of the present application further provides a device (for example, the device may be a chip system).
  • the device includes a processor, and is configured to support a mobile management network element to implement the foregoing policy control method, such as determining a terminal being established.
  • the first session of has the same S-NSSAI and DNN as the second session of the established terminal.
  • the device further includes a memory. This memory is used to store program instructions and data necessary for the mobile management network element. Of course, the memory may not be in the device.
  • the device is a chip system, the device may be composed of a chip, and may also include a chip and other discrete devices, which are not specifically limited in the embodiments of the present application.
  • FIG. 9 shows a schematic structural diagram of a network device 90.
  • the network device 90 includes a processing module 901 and a transceiver module 902.
  • the processing module 901 is configured to determine that the first session of the terminal being established and the second session of the established terminal have the same S-NSSAI and name DNN.
  • the transceiver module 902 is configured to send an identity of a policy control network element selected by the second session management network element corresponding to the second session to the first session management network element corresponding to the first session, and the identity of the policy control network element is used for the first session.
  • the management network element selection policy controls the network elements.
  • the transceiver module 902 is further configured to receive an identity of a policy control network element from the second session management network element during the establishment of the second session.
  • the network device 90 may be a unified data management network element.
  • the transceiver module 902 is further configured to send a subscription request for notification of a change in binding information to the unified database network element during the establishment of the second session.
  • the transceiver module 902 is further configured to receive a binding information change notification from a unified database network element, where the binding information change notification includes an identifier of the terminal, a policy control network element corresponding to the S-NSSAI, and a DNN.
  • the network device 90 further includes: a storage module 903.
  • the storage module 903 is configured to store a correspondence between the identifier of the terminal, the S-NSSAI, the DNN, and the identifier of the policy control network element.
  • the processing module 901 is further configured to determine the identity of the policy control network element according to the identity of the terminal, the S-NSSAI, the DNN, and the corresponding relationship.
  • the network device 90 may be a unified data management network element.
  • the transceiver module 902 is further configured to send a request message to the unified database network element, where the request message includes the identifier of the terminal, S-NSSAI, and DNN; the transceiver module 902 is further configured to receive the identifier of the terminal and the terminal from the unified database network element, S -The policy corresponding to the NSSAI and DNN controls the identity of the network element.
  • the processing module 901 is further configured to determine that the terminal establishes a first session in a non-roaming or home routing scenario.
  • the network device 90 is a mobile management network element; a processing module 901 is configured to determine that the first session of the terminal being established and the second session of the established terminal have the same S-NSSAI and DNN, specifically: It is determined that the first session of the terminal being established and the second session of the established terminal have the same S-NSSAI and DNN according to at least one of the subscription data of the terminal, the operator policy, and the session establishment request from the terminal.
  • the network device 90 is a mobile management network element; the transceiver module 902 is further configured to send instruction information to the first session management network element, where the instruction information is used to indicate that the policy control network element corresponding to the identity of the policy control network element is a session The policy control network element selected by the management network element; or, the instruction information is used to instruct the first session management network element to select the policy control network element corresponding to the identifier of the policy control network element; or the instruction information is used to indicate that the first session has a corresponding Binding information.
  • the network device 90 is a mobile management network element; the transceiver module 902 is further configured to carry the identifier of the policy control network element in a special field, and the special field is used to indicate that the policy control network element corresponding to the identifier of the policy control network element is The selection of the session management network element controls the network element.
  • the network device 90 is a unified data management network element; the transceiver module 902 is further configured to receive a registration request from the first session management network element, where the registration request includes the identity of the terminal, S-NSSAI, and DNN; correspondingly, processing Module 901, configured to determine that the first session of the terminal being established has the same S-NSSAI and DNN as the second session of the established terminal, and is specifically: used to determine that the current session is based on the identity of the terminal, S-NSSAI, and DNN.
  • the first session of the established terminal has the same S-NSSAI and DNN as the second session of the established terminal.
  • the network device 90 is presented in the form of dividing each functional module in an integrated manner.
  • the "module” herein may refer to a specific ASIC, a circuit, a processor and a memory executing one or more software or firmware programs, an integrated logic circuit, and / or other devices that can provide the above functions.
  • the network device 90 may take the form shown in FIG. 4.
  • the processor 401 in FIG. 4 may cause the network device 90 to execute the policy control method in the foregoing method embodiment by calling a computer execution instruction stored in the memory 403.
  • the function / implementation process of the transceiver module 902, the processing module 901, and the storage module 903 in FIG. 9 may be implemented by the processor 401 in FIG. 4 calling a computer execution instruction stored in the memory 403.
  • the function / implementation process of the processing module 901 in FIG. 9 may be implemented by the processor 401 in FIG. 4 calling a computer execution instruction stored in the memory 403, and the function / implementation process of the transceiver module 902 in FIG. 9 may be performed through the graph.
  • the communication interface 404 in FIG. 4 is implemented, and the function / implementation process of the storage module 903 in FIG. 9 may be implemented through the memory 403 in FIG. 4.
  • the network device 90 provided in this embodiment can execute the foregoing policy control method, the technical effects that can be obtained can refer to the foregoing method embodiments, and details are not described herein again.
  • an embodiment of the present application further provides an apparatus (for example, the apparatus may be a chip system).
  • the apparatus includes a processor, and is configured to support a network device to implement the foregoing policy control method, for example, determining a first terminal of a terminal being established.
  • One session has the same S-NSSAI and DNN as the second session of the established terminal.
  • the device further includes a memory. This memory is used to store the necessary program instructions and data of the network equipment. Of course, the memory may not be in the device.
  • the device is a chip system, the device may be composed of a chip, and may also include a chip and other discrete devices, which are not specifically limited in the embodiments of the present application.
  • FIG. 10 shows a schematic structural diagram of a first session management network element 100.
  • the first session management network element 100 includes a processing module 1001 and a transceiver module 1002.
  • the transceiver module 1002 is configured to receive a first request message from a mobility management network element for creating a first session, where the first request message includes an identifier of the terminal, S-NSSAI, and DNN.
  • the transceiver module 1002 is further configured to send a second request message to the binding support network element, where the second request message includes the identity of the terminal, S-NSSAI, and DNN, and is used to request the identity of the corresponding policy control network element, and the policy control network element A policy control network element corresponding to a second session, which is an established session of a terminal having the same S-NSSAI and DNN as the first session.
  • the transceiver module 1002 is further configured to receive an identity of a policy control network element from a binding support network element.
  • the processing module 1001 is configured to select a policy control network element according to the identity of the policy control network element.
  • the first request message further includes indication information, the indication information is used to instruct the first session management network element to obtain an identity of the policy control network element from the binding support network element; or, the indication information is used to indicate that the first session management network element has been established with the first The sessions of the terminals having the same S-NSSAI and DNN sessions; or the indication information is used to indicate that the first session has corresponding binding information.
  • the transceiver module 1002 is further configured to send a registration request to the unified data management network element, where the registration request includes the identifier of the terminal, the S-NSSAI and DNN corresponding to the first session of the terminal being established, and the transceiver module 1002, It is also used to receive instruction information from the unified data management network element, where the instruction information is used to instruct the first session management network element to obtain the identity of the policy control network element from the binding support network element; or, the instruction information is used to indicate that it has been established A session of the terminal having the same S-NSSAI and DNN as the first session; or, the indication information is used to indicate that the first session has corresponding binding information.
  • the transceiver module 1002 is configured to send a second request message to the binding support network element, and includes: sending a second request message to the binding support network element according to the instruction information.
  • the transceiver module 1002 is configured to receive a first request message from a mobility management network element for creating a first session, where the first request message includes an identifier of the terminal, S-NSSAI, and DNN.
  • the transceiver module is further configured to send a second request message to the binding support network element.
  • the second request message includes the identifier of the terminal, S-NSSAI, and DNN, and is used to request the identity of the corresponding policy control network element.
  • the policy control network element is The policy control network element corresponding to the second session is a session of an established terminal that has the same S-NSSAI and DNN as the first session.
  • a processing module 1001 is configured to, if it is determined that the identity of the policy control network element from the binding support network element is not received, according to the local configuration, the identity of the policy control network element provided by the mobile management network element, or the policy provided by the network storage function network element At least one of the identifications of the control network element selects a policy control network element for the first session.
  • the first session management network element 100 is presented in the form of dividing each functional module in an integrated manner.
  • the "module” herein may refer to a specific ASIC, a circuit, a processor and a memory executing one or more software or firmware programs, an integrated logic circuit, and / or other devices that can provide the above functions.
  • the first session management network element 100 may adopt the form shown in FIG. 4.
  • the processor 401 in FIG. 4 may cause the first session management network element 100 to execute the policy control method in the foregoing method embodiment by calling a computer execution instruction stored in the memory 403.
  • the function / implementation process of the transceiver module 1002 and the processing module 1001 in FIG. 10 may be implemented by the processor 401 in FIG. 4 calling a computer execution instruction stored in the memory 403.
  • the function / implementation process of the processing module 1001 in FIG. 10 may be implemented by the processor 401 in FIG. 4 calling a computer execution instruction stored in the memory 403, and the function / implementation process of the transceiver module 1002 in FIG. 10 may be performed through the graph.
  • the communication interface 404 in 4 is implemented.
  • the first session management network element 100 provided in this embodiment can execute the foregoing policy control method, the technical effects that can be obtained can refer to the foregoing method embodiments, and details are not described herein again.
  • an embodiment of the present application further provides a device (for example, the device may be a chip system).
  • the device includes a processor, and is configured to support a first session management network element to implement the foregoing policy control method, for example, to determine a policy according to a policy.
  • the identity selection policy of the control network element controls the network element.
  • the device further includes a memory.
  • the memory is used to store program instructions and data necessary for the first session management network element. Of course, the memory may not be in the device.
  • the device is a chip system, the device may be composed of a chip, and may also include a chip and other discrete devices, which are not specifically limited in the embodiments of the present application.
  • FIG. 11 shows a schematic structural diagram of a second session management network element 110.
  • the second session management network element 110 includes a processing module 1101 and a transceiver module 1102.
  • the processing module 1101 is configured to select a policy control network element during the process of establishing the second session of the terminal.
  • the transceiver module 1102 is configured to send the identity of the policy control network element to the network device.
  • the identity of the policy control network element is used by the first session management network element to select the policy control network element.
  • the first session management network element is a session corresponding to the first session.
  • the management network element, the first session is a session to be established for a terminal having the same S-NSSAI and DNN as the second session.
  • the network device is a mobile management network element or a unified data management network element.
  • the second session is the first session with S-NSSAI and DNN processed by the second session management network element for the terminal.
  • the transceiver module 1102 is further configured to receive instruction information from a mobile management network element, where the instruction information is used to indicate that a policy control network element is preferentially selected. For example, after the second session management network element selects the policy control network element, it sends a registration request including the identity of the policy control network element to the unified data management network element.
  • the second session management network element 110 is presented in the form of dividing each functional module in an integrated manner.
  • the "module” herein may refer to a specific ASIC, a circuit, a processor and a memory executing one or more software or firmware programs, an integrated logic circuit, and / or other devices that can provide the above functions.
  • the second session management network element 110 may adopt the form shown in FIG. 4.
  • the processor 401 in FIG. 4 may cause the second session management network element 110 to execute the policy control method in the foregoing method embodiment by calling a computer execution instruction stored in the memory 403.
  • the function / implementation process of the transceiver module 1102 and the processing module 1101 in FIG. 11 may be implemented by the processor 401 in FIG. 4 calling a computer execution instruction stored in the memory 403.
  • the function / implementation process of the processing module 1101 in FIG. 11 may be implemented by the processor 401 in FIG. 4 calling a computer execution instruction stored in the memory 403, and the function / implementation process of the transceiver module 1102 in FIG.
  • the communication interface 404 in 4 is implemented.
  • the second session management network element 110 provided in this embodiment can execute the foregoing policy control method, the technical effects that can be obtained can refer to the foregoing method embodiments, and details are not described herein again.
  • an embodiment of the present application further provides a device (for example, the device may be a chip system).
  • the device includes a processor, and is configured to support a second session management network element to implement the foregoing policy control method, for example, when establishing a terminal. During the second session, a policy control network element is selected.
  • the device further includes a memory.
  • the memory is used to store program instructions and data necessary for the second session management network element. Of course, the memory may not be in the device.
  • the device is a chip system, the device may be composed of a chip, and may also include a chip and other discrete devices, which are not specifically limited in the embodiments of the present application.
  • FIG. 15 shows a schematic structural diagram of a unified data management network element 150.
  • the unified data management network element 150 includes a receiving module 1501 and a sending module 1502.
  • the receiving module 1501 is configured to receive a registration request from a first session management network element, where the registration request includes an identifier of a terminal, and an S-NSSAI and a DNN corresponding to the first session of the terminal being established.
  • the sending module 1502 is configured to send indication information to the first session management network element, where the indication information is used to instruct the first session management network element to obtain an identity of a policy control network element from a binding support network element; or, the indication information is used For indicating that a session of the terminal having the same S-NSSAI and DNN as the first session has been established; or, the indication information is used to indicate that the first session has corresponding binding information.
  • the unified data management network element 150 may further include a processing module 1503.
  • the processing module 1503 is configured to determine that the first session of the terminal being established and the established second session of the terminal have the same S-NSSAI and DNN.
  • the processing module 1501 is further configured to determine that the terminal establishes the first session in a non-roaming or home routing scenario.
  • the unified data management network element 150 is presented in the form of dividing each functional module in an integrated manner.
  • the "module” herein may refer to a specific ASIC, a circuit, a processor and a memory executing one or more software or firmware programs, an integrated logic circuit, and / or other devices that can provide the above functions.
  • the unified data management network element 150 may adopt the form shown in FIG. 4.
  • the processor 401 in FIG. 4 may cause the unified data management network element 150 to execute the policy control method in the foregoing method embodiment by calling a computer execution instruction stored in the memory 403.
  • the function / implementation process of the receiving module 1501, the sending module 1502, and the processing module 1503 in FIG. 15 may be implemented by the processor 401 in FIG. 4 calling a computer execution instruction stored in the memory 403.
  • the function / implementation process of the processing module 1503 in FIG. 15 may be implemented by the processor 401 in FIG. 4 calling a computer execution instruction stored in the memory 403, and the function / implementation of the receiving module 1501 and the sending module 1502 in FIG. 15
  • the process may be implemented through the communication interface 404 in FIG. 4.
  • the unified data management network element 150 provided in this embodiment can execute the foregoing policy control method, the technical effects that can be obtained can refer to the foregoing method embodiments, and details are not described herein again.
  • an embodiment of the present application further provides a device (for example, the device may be a chip system).
  • the device includes a processor, and is configured to support a unified data management network element to implement the foregoing policy control method, for example, determining a The first session of the terminal has the same S-NSSAI and DNN as the established second session of the terminal.
  • the device further includes a memory. This memory is used to store the necessary program instructions and data of the unified data management network element. Of course, the memory may not be in the device.
  • the device is a chip system, the device may be composed of a chip, and may also include a chip and other discrete devices, which are not specifically limited in the embodiments of the present application.
  • FIG. 16 shows a schematic structural diagram of a first policy control network element 160.
  • the first policy control network element 160 includes a receiving module 1601 and a sending module 1602.
  • the receiving module 1601 is configured to receive a policy control creation request from a first session management management network element, where the policy control creation request includes a terminal identifier, an S-NSSAI, and a DNN; a sending module 1602 is configured to: For sending the identification of the terminal, the S-NSSAI, the DNN and the identification of the first policy control network element 160 to the binding support network element; the receiving module 1601 is further configured to receive the second policy control network element from the binding support network element.
  • the identification and sending module 1602 is further configured to send the identification of the second policy control network element to the first session management network element.
  • the identification of the second policy control network element is the identification of the binding support terminal and the S-NSSAI stored in the network element.
  • the policy corresponding to the DNN controls the identification of the network element.
  • the first policy control network element 160 further includes a processing module 1603.
  • the processing module 1603 is used to determine that the same policy control network element needs to be selected for the combination of the terminal's identity, S-NSSAI, and DNN.
  • the sending module 1602 is also used to send instruction information to the binding support network element. It is used to indicate that the same policy control network element is selected for the combination of the terminal's identification, S-NSSAI, and DNN.
  • the receiving module 1601 is configured to receive a policy control creation request from a first session management network element, and the policy control creation request includes an identifier of the terminal, S-NSSAI, and DNN; and a sending module 1602 is configured to: Sending the identification of the terminal, the S-NSSAI, the DNN, and the identification of the first policy control network element group to which the first policy control network element belongs to the binding supporting network element; the receiving module 1601 is further configured to receive the first Two policy control NE group identifiers; a sending module 1602 is further configured to send the second policy control NE group identifiers to the first session management network element, and the second policy control NE group identifiers are bound to the terminals that support the preservation of the network elements. , The S-NSSAI and the DNN corresponding to the policy control network element group.
  • the first policy control network element 160 further includes: a processing module 1603.
  • a processing module 1603 is used to determine that the same policy control network element group needs to be selected for the combination of the terminal identification, S-NSSAI, and DNN;
  • a sending module 1602 is used to send instruction information to the binding support network element, and the instruction information is used to indicate Select the same policy control network element group for the combination of terminal identification, S-NSSAI, and DNN.
  • the first policy control network element 160 is presented in the form of dividing each functional module in an integrated manner.
  • the "module” herein may refer to a specific ASIC, a circuit, a processor and a memory executing one or more software or firmware programs, an integrated logic circuit, and / or other devices that can provide the above functions.
  • the first policy control network element 160 may adopt the form shown in FIG. 4.
  • the processor 401 in FIG. 4 may cause the first policy control network element 160 to execute the policy control method in the foregoing method embodiment by calling a computer execution instruction stored in the memory 403.
  • the function / implementation process of the receiving module 1601, the sending module 1602, and the processing module 1603 in FIG. 16 may be implemented by the processor 401 in FIG. 4 calling a computer execution instruction stored in the memory 403.
  • the function / implementation process of the processing module 1603 in FIG. 16 may be implemented by the processor 401 in FIG. 4 calling a computer execution instruction stored in the memory 403, and the function / implementation of the receiving module 1601 and the sending module 1602 in FIG. 16
  • the process may be implemented through the communication interface 404 in FIG. 4.
  • the first policy control network element 160 provided in this embodiment can execute the foregoing policy control method, the technical effects that can be obtained can refer to the foregoing method embodiments, and details are not described herein again.
  • an embodiment of the present application further provides a device (for example, the device may be a chip system).
  • the device includes a processor, and is configured to support a first policy control network element to implement the foregoing policy control method.
  • the combination of terminal identification, S-NSSAI, and DNN selects the same policy control network element.
  • the device further includes a memory.
  • the memory is used to store program instructions and data necessary for the first policy control network element. Of course, the memory may not be in the device.
  • the device is a chip system, the device may be composed of a chip, and may also include a chip and other discrete devices, which are not specifically limited in the embodiments of the present application.
  • FIG. 17 shows a schematic structural diagram of a binding support network element 170.
  • the bonding support network element 170 includes a processing module 1701 and a transceiver module 1702.
  • the transceiver module 1702 is configured to receive the identifier of the terminal from the first policy control network element, the S-NSSAI, the DNN, and the identifier of the first policy control network element; the processing module 1701 is configured to determine that There is an identity of the second policy control network element corresponding to the identity of the terminal, the combination of S-NSSAI and DNN; the transceiver module 1702 is further configured to send the identity of the second policy control network element to the first policy control network element.
  • the binding support network element 170 further includes: a storage module 1703.
  • the transceiver module 1702 is further configured to receive the identifier of the terminal from the second policy control network element, the S-NSSAI, DNN, and the identifier of the second policy control network element during the second session establishment process;
  • the storage module 1703 is configured to store The correspondence between the identity of the terminal, the S-NSSAI, the DNN, and the identity of the second policy control network element.
  • the transceiver module 1702 is further configured to receive instruction information from the first policy control network element, and the instruction information is used to indicate that the same policy control network element is selected for the combination of the terminal identifier, S-NSSAI, and DNN; the processing module 1701. It is further configured to determine, according to the instruction information, an identifier of sending the second policy control network element to the first policy control network element.
  • the transceiver module 1702 is configured to receive the identifier of the terminal from the first policy control network element, the S-NSSAI, the DNN, and the first policy control network element group identifier to which the first policy control network element belongs.
  • a processing module 1701 configured to determine that a second policy control network element group identifier corresponding to a combination of the terminal identifier, S-NSSAI, and DNN already exists; a transceiver module 1702, further configured to send a second policy control network element to the second Policy control network element group identification.
  • the binding support network element 170 further includes: a storage module 1703.
  • the transceiver module 1702 is further configured to receive, during the establishment of the second session, the identifier of the terminal from the second policy control network element, the S-NSSAI, the DNN, and the identifier of the second policy control network element group to which the second policy control network element belongs.
  • a storage module 1703 configured to store a correspondence between the identifier of the terminal, the S-NSSAI, the DNN, and the identifier of the second policy control network element group.
  • the transceiver module 1702 is further configured to receive instruction information from the first policy control network element, and the instruction information is used to indicate that the same policy control network element group is selected for the combination of the terminal identifier, S-NSSAI, and DNN; processing Module 1701 is further configured to determine to send the second policy control network element group identifier to the first policy control network element according to the instruction information.
  • the binding support network element 170 is presented in the form of dividing each functional module in an integrated manner.
  • the "module” herein may refer to a specific ASIC, a circuit, a processor and a memory executing one or more software or firmware programs, an integrated logic circuit, and / or other devices that can provide the above functions.
  • the binding support network element 170 may take the form shown in FIG. 4.
  • the processor 401 in FIG. 4 may call a computer execution instruction stored in the memory 403 to cause the binding support network element 170 to execute the policy control method in the foregoing method embodiment.
  • the function / implementation process of the transceiver module 1702, the processing module 1701, and the storage module 1703 in FIG. 17 may be implemented by the processor 401 in FIG. 4 calling a computer execution instruction stored in the memory 403.
  • the function / implementation process of the processing module 1701 in FIG. 17 may be implemented by the processor 401 in FIG. 4 calling a computer execution instruction stored in the memory 403, and the function / implementation process of the transceiver module 1702 in FIG. 17 may be performed through the graph.
  • the communication interface 404 in FIG. 4 is implemented, and the function / implementation process of the storage module 1703 in FIG. 17 may be implemented through the memory 403 in FIG. 4.
  • binding support network element 170 provided in this embodiment can execute the foregoing policy control method, the technical effects that can be obtained can refer to the foregoing method embodiments, and details are not described herein again.
  • an embodiment of the present application further provides a device (for example, the device may be a chip system), and the device includes a processor, which is configured to support a binding support network element to implement the foregoing policy control method, for example, determining that an existing The identity of the terminal and the identity of the second policy control network element corresponding to the combination of S-NSSAI and DNN.
  • the device further includes a memory. This memory is used to store program instructions and data necessary for binding support network elements. Of course, the memory may not be in the device.
  • the device is a chip system, the device may be composed of a chip, and may also include a chip and other discrete devices, which are not specifically limited in the embodiments of the present application.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be from a website site, a computer, a server, or a data center.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device including one or more servers, data centers, and the like that can be integrated with the medium.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (SSD)).

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Abstract

本申请实施例提供策略控制方法、设备及系统，可以避免为同一个终端的具有相同S-NSSAI和DNN的多个PDU会话制定的策略与从统一数据库网元获取的签约信息相冲突的问题。方法包括：移动管理网元向第一会话管理网元发送用于创建第一会话的第一请求消息，该第一请求消息包括终端的标识、单个网络切片选择辅助信息S-NSSAI和数据网络名称DNN；第一会话管理网元接收来自移动管理网元的第一请求消息，并向绑定支持网元发送第二请求消息，该第二请求消息包括该终端的标识、该S-NSSAI和该DNN；第一会话管理网元接收来自绑定支持网元的策略控制网元的标识，并根据该策略控制网元的标识选择该策略控制网元。

Description

策略控制方法、设备及系统
本申请要求于2018年9月19日提交国家知识产权局、申请号为201811096126.8、申请名称为“策略控制方法、设备及系统”，以及于2018年10月31日提交国家知识产权局、申请号为201811288799.3、申请名称为“策略控制方法、设备及系统”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
本申请涉及通信技术领域，尤其涉及策略控制方法、设备及系统。
背景技术
现有的第五代(5th generation，5G)网络中，终端请求建立到相同单个网络切片选择辅助信息(single network slice selection assistance information，S-NSSAI)和数据网络名称(data network name，DNN)的多个协议数据单元(protocol data unit，PDU)会话的流程中，对于不同的PDU会话，接入和移动性管理功能(access and mobility management function，AMF)网元选择不同的会话管理功能(session management function，SMF)网元，并且不同的SMF网元选择不同的策略控制功能(policy control function，PCF)网元，以便从相应的PCF网元获取策略计费控制(policy and charging control，PCC)规则和其他PDU会话相关的策略。
然而，由于PCF网元中在制定PCC规则和其他PDU会话相关的策略时，是根据从统一数据库(unified data repository，UDR)网元中获取的签约信息制定的。签约信息例如可以包括允许PCF授权给终端的最大保证带宽，或者PCF网元授权给终端的剩余用量等。这样，多个PCF网元分别根据该签约信息进行策略决策，有可能导致为同一个终端的具有相同S-NSSAI和DNN的多个PDU会话制定的策略与该签约信息相冲突。比如，为同一个终端的具有相同S-NSSAI和DNN的多个PDU会话授权的总最大保证带宽超过签约信息中允许PCF网元授权给终端的最大保证带宽，为同一个终端的具有相同S-NSSAI和DNN的多个PDU会话使用的总累计用量超过签约信息中PCF网元授权给终端的剩余用量。
因此，如何避免为同一个终端的具有相同S-NSSAI和DNN的多个PDU会话制定的策略与从UDR网元获取的签约信息相冲突的问题，是目前亟待解决的问题。
发明内容
本申请实施例提供策略控制方法、设备及系统，可以避免为同一个终端的具有相同S-NSSAI和DNN的多个PDU会话制定的策略与从统一数据库网元获取的签约信息相冲突的问题。
为达到上述目的，本申请的实施例采用如下技术方案：
第一方面，提供了一种策略控制方法，该方法包括：移动管理网元向第一会话管理网元发送用于创建第一会话的第一请求消息，该第一请求消息包括终端的标识、单个网络切片选择辅助信息S-NSSAI和数据网络名称DNN；第一会话管理网元接收来自移动管理网元的第一请求消息，并向绑定支持网元发送第二请求消息，该第二请求消 息包括该终端的标识、该S-NSSAI和该DNN；第一会话管理网元接收来自绑定支持网元的策略控制网元的标识，并根据该策略控制网元的标识选择该策略控制网元。基于本申请实施例提供的策略控制方法，由于移动管理网元可以向第一会话管理网元发送用于创建第一会话的第一请求消息，该第一请求消息包括终端的标识、S-NSSAI和DNN。进而，第一会话管理网元可以根据终端的标识、S-NSSAI和DNN，从绑定支持网元获取对应的策略控制网元的标识，并根据策略控制网元的标识选择该策略控制网元，该策略控制网元可以为第二会话对应的策略控制网元。也就是说，可以保证为同一个终端的具有相同S-NSSAI和DNN的多个会话选择相同的策略控制网元，因此可以避免为同一个终端的具有相同S-NSSAI和DNN的多个PDU会话制定的策略与从统一数据库网元获取的签约信息相冲突的问题。
在一种可能的设计中，在移动管理网元向第一会话管理网元发送该第一请求消息之前，该方法还包括：移动管理网元确定该第一会话与已建立的该终端的第二会话具有相同的S-NSSAI和DNN；相应的，该第一请求消息还包括指示信息，该指示信息用于指示该第一会话管理网元从绑定支持网元获取策略控制网元的标识；或者，该指示信息用于指示已建立与该第一会话具有相同的S-NSSAI和DNN的该终端的会话；或者，该指示信息用于指示该第一会话存在对应的绑定信息。也就是说，本申请实施例中，移动管理网元在确定该第一会话与已建立的该终端的第二会话具有相同的S-NSSAI和DNN之后，可以在向第一会话管理网元发送的第一请求消息中包括指示信息，使得第一会话管理网元可以根据该指示信息，从绑定支持网元获取策略控制网元的标识。
在一种可能的设计中，在移动管理网元向第一会话管理网元发送第一请求消息之前，该方法还包括：该移动管理网元确定该终端在非漫游或家乡路由场景下建立该第一会话。
在一种可能的设计中，该方法还包括：在建立该第二会话的过程中，第二会话管理网元选择该策略控制网元，并向绑定支持网元发送注册请求，该注册请求包括该终端的标识、该S-NSSAI、该DNN和该策略控制网元的标识。这样，绑定支持网元可以存储该终端的标识、该S-NSSAI、该DNN和该策略控制网元的标识的对应关系，进而后续绑定支持网元根据该对应关系，可以确定出与该终端的标识、该S-NSSAI、该DNN对应的该策略控制网元的标识。
第二方面，提供了一种策略控制方法，该方法包括：移动管理网元确定正在建立的终端的第一会话与已建立的该终端的第二会话具有相同的单个网络切片选择辅助信息S-NSSAI和数据网络名称DNN；移动管理网元向第一会话管理网元发送用于创建该第一会话的第一请求消息，该第一请求消息包括该终端的标识、该S-NSSAI、该DNN和指示信息，该指示信息用于指示该第一会话管理网元从绑定支持网元获取策略控制网元的标识；或者，该指示信息用于指示已建立与该第一会话具有相同的S-NSSAI和DNN的该终端的会话；或者，该指示信息用于指示该第一会话存在对应的绑定信息。基于本申请实施例提供的策略控制方法，由于移动管理网元可以向第一会话管理网元发送用于创建第一会话的第一请求消息，该第一请求消息包括终端的标识、S-NSSAI和DNN。进而，第一会话管理网元可以根据终端的标识、S-NSSAI、DNN和指示信息，使得第一会话管理网元可以根据该指示信息从绑定支持网元获取对应的策略控制网元 的标识，并根据策略控制网元的标识选择该策略控制网元，该策略控制网元可以为第二会话对应的策略控制网元。也就是说，可以保证为同一个终端的具有相同S-NSSAI和DNN的多个会话选择相同的策略控制网元，因此可以避免为同一个终端的具有相同S-NSSAI和DNN的多个PDU会话制定的策略与从统一数据库网元获取的签约信息相冲突的问题。
在一种可能的设计中，移动管理网元确定正在建立的终端的第一会话与已建立的该终端的第二会话具有相同的S-NSSAI和DNN，具体为：移动管理网元根据该终端的签约数据、运营商策略和来自该终端的会话建立请求中的至少一个，确定正在建立的该终端的第一会话与已建立的该终端的第二会话具有相同的S-NSSAI和DNN。
在一种可能的设计中，在该移动管理网元向第一会话管理网元发送该第一请求消息之前，该方法还包括：移动管理网元确定该终端在非漫游或家乡路由场景下建立该第一会话。
第三方面，提供了一种策略控制方法，该方法包括：网络设备确定正在建立的终端的第一会话与已建立的该终端的第二会话具有相同的单个网络切片选择辅助信息S-NSSAI和数据网络名称DNN；网络设备向该第一会话对应的第一会话管理网元发送该第二会话对应的第二会话管理网元选择的策略控制网元的标识，该策略控制网元的标识用于该第一会话管理网元选择该策略控制网元。基于本申请实施例提供的策略控制方法，由于网络设备在确定正在建立的终端的第一会话与已建立的终端的第二会话具有相同的S-NSSAI和DNN之后，向第一会话管理网元发送第二会话对应的第二会话管理网元选择的策略控制网元的标识，使得第二会话管理网元可以根据该策略控制网元的标识选择对应的策略控制网元。也就是说，可以保证为同一个终端的具有相同S-NSSAI和DNN的多个会话选择相同的策略控制网元，因此可以避免为同一个终端的具有相同S-NSSAI和DNN的多个PDU会话制定的策略与从统一数据库网元获取的签约信息相冲突的问题。
在一种可能的设计中，该方法还包括：在建立该第二会话的过程中，该网络设备接收来自该第二会话管理网元的该策略控制网元的标识。
在一种可能的设计中，网络设备为统一数据管理网元；该方法还包括：在建立第二会话的过程中，统一数据管理网元向统一数据库网元发送绑定信息改变通知的订阅请求；统一数据管理网元接收来自统一数据库网元的绑定信息改变通知，该绑定信息改变通知包括与该终端的标识、该S-NSSAI和该DNN对应的策略控制网元的标识。基于该方案，统一数据管理网元可以获取与该终端的标识、该S-NSSAI和该DNN对应的策略控制网元的标识。
在一种可能的设计中，该方法还包括：该网络设备存储该终端的标识、该S-NSSAI、该DNN和该策略控制网元的标识的对应关系。这样，后续网络设备根据该对应关系，可以确定出与该终端的标识、该S-NSSAI、该DNN对应的该策略控制网元的标识。
在一种可能的设计中，在网络设备向该第一会话管理网元发送该策略控制网元的标识之前，该方法还包括：网络设备根据该终端的标识、该S-NSSAI、该DNN和该对应关系，确定该策略控制网元的标识。
在一种可能的设计中，网络设备为统一数据管理网元；在网络设备向第一会话管 理网元发送策略控制网元的标识之前，该方法还包括：统一数据管理网元向统一数据库网元发送请求消息，该请求消息包括该终端的标识、该S-NSSAI和该DNN；统一数据管理网元接收来自统一数据库网元的与该终端的标识、该S-NSSAI和该DNN对应的策略控制网元的标识。基于该方案，统一数据管理网元可以获取与该终端的标识、该S-NSSAI和该DNN对应的策略控制网元的标识。
在一种可能的设计中，在网络设备向该第一会话管理网元发送该策略控制网元的标识之前，该方法还包括：网络设备确定该终端在非漫游或家乡路由场景下建立该第一会话。
在一种可能的设计中，该网络设备为移动管理网元；网络设备确定正在建立的终端的第一会话与已建立的该终端的第二会话具有相同的S-NSSAI和DNN，具体为：移动管理网元根据该终端的签约数据、运营商策略和来自该终端的会话建立请求中的至少一个，确定正在建立的该终端的第一会话与已建立的该终端的第二会话具有相同的S-NSSAI和DNN。
在一种可能的设计中，该网络设备为移动管理网元；该方法还包括：移动管理网元向第一会话管理网元发送指示信息，该指示信息用于指示该策略控制网元的标识对应的该策略控制网元是会话管理网元选择的策略控制网元；或者，该指示信息用于指示该第一会话管理网元选择该策略控制网元的标识对应的该策略控制网元；或者，该指示信息用于指示该第一会话存在对应的绑定信息。这样，第一会话管理网元根据该指示信息，可以选择该策略控制网元的标识对应的策略控制网元。
在一种可能的设计中，该网络设备为移动管理网元；该方法还包括：移动管理网元在特殊字段中携带该策略控制网元的标识，该特殊字段用于指示该策略控制网元的标识对应的该策略控制网元是会话管理网元选择的策略控制网元。这样，第一会话管理网元根据该携带该策略控制网元的标识的字段，可以选择该策略控制网元的标识对应的策略控制网元。
在一种可能的设计中，网络设备为统一数据管理网元；在网络设备确定正在建立的终端的第一会话与已建立的该终端的第二会话具有相同的S-NSSAI和DNN之前，该方法还包括：统一数据管理网元接收来自该第一会话管理网元的注册请求，该注册请求包括该终端的标识、该S-NSSAI和该DNN；相应的，网络设备确定正在建立的终端的第一会话与已建立的该终端的第二会话具有相同的S-NSSAI和DNN，具体为：统一数据管理网元根据该终端的标识、该S-NSSAI和该DNN，确定正在建立的该终端的第一会话与已建立的该终端的第二会话具有相同的S-NSSAI和DNN。基于该方案，网络设备可以确定正在建立的终端的第一会话与已建立的该终端的第二会话具有相同的S-NSSAI和DNN。
第四方面，提供了一种策略控制方法，该方法包括：第一会话管理网元接收来自移动管理网元的用于创建第一会话的第一请求消息，该第一请求消息包括终端的标识、单个网络切片选择辅助信息S-NSSAI和数据网络名称DNN；第一会话管理网元向绑定支持网元发送第二请求消息，该第二请求消息包括该终端的标识、该S-NSSAI和该DNN，用于请求对应的策略控制网元的标识，该策略控制网元为第二会话对应的策略控制网元，该第二会话为已建立的与该第一会话具有相同S-NSSAI和DNN的该终端的会话； 第一会话管理网元接收来自该绑定支持网元的该策略控制网元的标识，并根据该策略控制网元的标识选择该策略控制网元。基于本申请实施例提供的策略控制方法，由于移动管理网元可以向第一会话管理网元发送用于创建第一会话的第一请求消息，该第一请求消息包括终端的标识、S-NSSAI和DNN。进而，第一会话管理网元可以根据终端的标识、S-NSSAI和DNN，从绑定支持网元获取对应的策略控制网元的标识，并根据策略控制网元的标识选择该策略控制网元，该策略控制网元可以为第二会话对应的策略控制网元。也就是说，可以保证为同一个终端的具有相同S-NSSAI和DNN的多个会话选择相同的策略控制网元，因此可以避免为同一个终端的具有相同S-NSSAI和DNN的多个PDU会话制定的策略与从统一数据库网元获取的签约信息相冲突的问题。
在一种可能的设计中，该第一请求消息还包括指示信息，该指示信息用于指示该第一会话管理网元从该绑定支持网元获取该策略控制网元的标识；或者，该指示信息用于指示已建立与该第一会话具有相同的S-NSSAI和DNN的该终端的会话；或者，该指示信息用于指示该第一会话存在对应的绑定信息。也就是说，本申请实施例中，移动管理网元可以在向第一会话管理网元发送的第一请求消息中包括指示信息，使得第一会话管理网元可以根据该指示信息，从绑定支持网元获取策略控制网元的标识。
在一种可能的设计中，在该第一会话管理网元向绑定支持网元发送第二请求消息之前，还可以包括：第一会话管理网元向统一数据管理网元发送注册请求，该注册请求包括终端的标识、正在建立的该终端的第一会话对应的单个网络切片选择辅助信息S-NSSAI和数据网络名称DNN；第一会话管理网元接收来自统一数据管理网元的指示信息，该指示信息用于指示第一会话管理网元从绑定支持网元获取策略控制网元的标识；或者，该指示信息用于指示已建立与第一会话具有相同的S-NSSAI和DNN的所述终端的会话；或者，该指示信息用于指示第一会话存在对应的绑定信息；相应的，第一会话管理网元向绑定支持网元发送第二请求消息，包括：第一会话管理网元根据该指示信息，向绑定支持网元发送第二请求消息。也就是说，本申请实施例中，第一会话管理网元可以在为第一会话在统一数据管理网元中进行注册时，获取指示信息使得第一会话管理网元可以根据该指示信息，从绑定支持网元获取策略控制网元的标识。
第五方面，提供了一种策略控制方法，该方法包括：第一会话管理网元接收来自移动管理网元的用于创建第一会话的第一请求消息，该第一请求消息包括终端的标识、单个网络切片选择辅助信息S-NSSAI和数据网络名称DNN；该第一会话管理网元向绑定支持网元发送第二请求消息，该第二请求消息包括该终端的标识、该S-NSSAI和该DNN，用于请求对应的策略控制网元的标识，该策略控制网元为第二会话对应的策略控制网元，该第二会话为已建立的与该第一会话具有相同S-NSSAI和DNN的该终端的会话；若第一会话管理网元确定接收不到来自该绑定支持网元的该策略控制网元的标识，第一会话管理网元根据本地配置，移动管理网元提供的策略控制网元的标识或者网络存储功能网元提供的策略控制网元的标识中的至少一个为第一会话选择策略控制网元。也就是说，本申请实施例中，若第一会话管理网元无法从绑定支持网元获取策略控制网元的标识，则可以执行其他策略控制网元的选择方法，如根据本地配置，移动管理网元提供的策略控制网元的标识或者网络存储功能网元提供的策略控制网元的标识中的至少一个为第一会话选择策略控制网元，本申请实施例对此不作具体限定。
第六方面，提供了一种策略控制方法，该方法包括：在建立终端的第二会话的过程中，该第二会话对应的第二会话管理网元选择策略控制网元；第二会话管理网元向网络设备发送该策略控制网元的标识，该策略控制网元的标识用于第一会话管理网元选择该策略控制网元，该第一会话管理网元为第一会话对应的会话管理网元，该第一会话为待建立的与该第二会话具有相同的单个网络切片选择辅助信息S-NSSAI和数据网络名称DNN的该终端的会话。也就是说，可以保证为同一个终端的具有相同S-NSSAI和DNN的多个会话选择相同的策略控制网元，因此可以避免为同一个终端的具有相同S-NSSAI和DNN的多个PDU会话制定的策略与从统一数据库网元获取的签约信息相冲突的问题。
在一种可能的设计中，该网络设备为移动管理网元或者统一数据管理网元。
在一种可能的设计中，该第二会话为该第二会话管理网元为该终端处理的第一个具有该S-NSSAI和该DNN的会话。
在一种可能的设计中，第二会话管理网元接收来自移动管理网元的指示信息，该指示信息用于指示优先执行策略控制网元的选择。比如，第二会话管理网元在选择策略控制网元之后，再向该统一数据管理网元发送包括该策略控制网元的标识的注册请求。
第七方面，提供了一种移动管理网元，该移动管理网元具有实现上述第二方面所述的方法的功能。该功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的模块。
第八方面，提供了一种移动管理网元，包括：处理器和存储器；该存储器用于存储计算机执行指令，当该移动管理网元运行时，该处理器执行该存储器存储的该计算机执行指令，以使该移动管理网元执行如上述第二方面中任一项所述的策略控制方法。
第九方面，提供了一种移动管理网元，包括：处理器；所述处理器用于与存储器耦合，并读取存储器中的指令之后，根据所述指令执行如上述第二方面中任一项所述的策略控制方法。
第十方面，提供了一种计算机可读存储介质，该计算机可读存储介质中存储有指令，当其在计算机上运行时，使得计算机可以执行上述第二方面中任一项所述的策略控制方法。
第十一方面，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，使得计算机可以执行上述第二方面中任一项所述的策略控制方法。
第十二方面，提供了一种装置(例如，该装置可以是芯片系统)，该装置包括处理器，用于支持移动管理网元实现上述第二方面中所涉及的功能，例如确定正在建立的终端的第一会话与已建立的该终端的第二会话具有相同的S-NSSAI和DNN。在一种可能的设计中，该装置还包括存储器，该存储器，用于保存移动管理网元必要的程序指令和数据。该装置是芯片系统时，可以由芯片构成，也可以包含芯片和其他分立器件。
其中，第七方面至第十二方面中任一种设计方式所带来的技术效果可参见第二方面中不同设计方式所带来的技术效果，此处不再赘述。
第十三方面，提供了一种网络设备，该网络设备具有实现上述第三方面或者下述 第三十四方面所述的方法的功能。该功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的模块。
第十四方面，提供了一种网络设备，包括：处理器和存储器；该存储器用于存储计算机执行指令，当该网络设备运行时，该处理器执行该存储器存储的该计算机执行指令，以使该网络设备执行如上述第三方面或者下述第三十四方面中任一项所述的策略控制方法。
第十五方面，提供了一种网络设备，包括：处理器；所述处理器用于与存储器耦合，并读取存储器中的指令之后，根据所述指令执行如上述第三方面或者下述第三十四方面中任一项所述的策略控制方法。
第十六方面，提供了一种计算机可读存储介质，该计算机可读存储介质中存储有指令，当其在计算机上运行时，使得计算机可以执行上述第三方面或者下述第三十四方面中任一项所述的策略控制方法。
第十七方面，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，使得计算机可以执行上述第三方面或者下述第三十四方面中任一项所述的策略控制方法。
第十八方面，提供了一种装置(例如，该装置可以是芯片系统)，该装置包括处理器，用于支持网络设备实现上述第三方面或者下述第三十四方面中所涉及的功能，例如确定正在建立的终端的第一会话与已建立的该终端的第二会话具有相同的S-NSSAI和DNN。在一种可能的设计中，该装置还包括存储器，该存储器，用于保存网络设备必要的程序指令和数据。该装置是芯片系统时，可以由芯片构成，也可以包含芯片和其他分立器件。
其中，第十三方面至第十八方面中任一种设计方式所带来的技术效果可参见第三方面或者下述第三十四方面中不同设计方式所带来的技术效果，此处不再赘述。
第十九方面，提供了一种第一会话管理网元，该第一会话管理网元具有实现上述第四方面或第五方面所述的方法的功能。该功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的模块。
第二十方面，提供了一种第一会话管理网元，包括：处理器和存储器；该存储器用于存储计算机执行指令，当该第一会话管理网元运行时，该处理器执行该存储器存储的该计算机执行指令，以使该第一会话管理网元执行如上述第四方面或第五方面中任一项所述的策略控制方法。
第二十一方面，提供了一种第一会话管理网元，包括：处理器；所述处理器用于与存储器耦合，并读取存储器中的指令之后，根据所述指令执行如上述第四方面或第五方面中任一项所述的策略控制方法。
第二十二方面，提供了一种计算机可读存储介质，该计算机可读存储介质中存储有指令，当其在计算机上运行时，使得计算机可以执行上述第四方面或第五方面中任一项所述的策略控制方法。
第二十三方面，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，使得计算机可以执行上述第四方面或第五方面中任一项所述的策略控制方法。
第二十四方面，提供了一种装置(例如，该装置可以是芯片系统)，该装置包括 处理器，用于支持第一会话管理网元实现上述第四方面或第五方面中所涉及的功能，例如根据该策略控制网元的标识选择该策略控制网元。在一种可能的设计中，该装置还包括存储器，该存储器，用于保存第一会话管理网元必要的程序指令和数据。该装置是芯片系统时，可以由芯片构成，也可以包含芯片和其他分立器件。
其中，第十九方面至第二十四方面中任一种设计方式所带来的技术效果可参见第四方面或第五方面中不同设计方式所带来的技术效果，此处不再赘述。
第二十五方面，提供了一种第二会话管理网元，该第二会话管理网元具有实现上述第六方面所述的方法的功能。该功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的模块。
第二十六方面，提供了一种第二会话管理网元，包括：处理器和存储器；该存储器用于存储计算机执行指令，当该第二会话管理网元运行时，该处理器执行该存储器存储的该计算机执行指令，以使该第二会话管理网元执行如上述第六方面中任一项所述的策略控制方法。
第二十七方面，提供了一种第二会话管理网元，包括：处理器；所述处理器用于与存储器耦合，并读取存储器中的指令之后，根据所述指令执行如上述第六方面中任一项所述的策略控制方法。
第二十八方面，提供了一种计算机可读存储介质，该计算机可读存储介质中存储有指令，当其在计算机上运行时，使得计算机可以执行上述第六方面中任一项所述的策略控制方法。
第二十九方面，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，使得计算机可以执行上述第六方面中任一项所述的策略控制方法。
第三十方面，提供了一种装置(例如，该装置可以是芯片系统)，该装置包括处理器，用于支持第二会话管理网元实现上述第六方面中所涉及的功能，例如确定正在建立的终端的第一会话与已建立的该终端的第二会话具有相同的S-NSSAI和DNN。在一种可能的设计中，该装置还包括存储器，该存储器，用于保存第二会话管理网元必要的程序指令和数据。该装置是芯片系统时，可以由芯片构成，也可以包含芯片和其他分立器件。
其中，第二十五方面至第三十方面中任一种设计方式所带来的技术效果可参见第六方面中不同设计方式所带来的技术效果，此处不再赘述。
第三十一方面，提供一种策略控制系统，包括：移动管理网元和第一会话管理网元；移动管理网元，用于向第一会话管理网元发送用于创建第一会话的第一请求消息，该第一请求消息包括终端的标识、单个网络切片选择辅助信息S-NSSAI和数据网络名称DNN；第一会话管理网元，用于接收来自移动管理网元的第一请求消息，并向绑定支持网元发送第二请求消息，该第二请求消息包括终端的标识、S-NSSAI和DNN；第一会话管理网元，还用于接收来自绑定支持网元的策略控制网元的标识，并根据该策略控制网元的标识选择该策略控制网元。
在一种可能的设计中，移动管理网元，还用于确定第一会话与已建立的终端的第二会话具有相同的S-NSSAI和DNN；相应的，第一请求消息还包括指示信息，指示信息用于指示第一会话管理网元从绑定支持网元获取策略控制网元的标识；或者，指示 信息用于指示已建立与第一会话具有相同的S-NSSAI和DNN的终端的会话；或者，该指示信息用于指示该第一会话存在对应的绑定信息。
在一种可能的设计中，该策略控制系统还包括第二会话管理网元；第二会话管理网元，用于在建立第二会话的过程中，选择策略控制网元，并向绑定支持网元发送注册请求，注册请求包括终端的标识、S-NSSAI、DNN和策略控制网元的标识。
其中，第三十一方面中任一种设计方式所带来的技术效果可参见上述第一方面中不同设计方式所带来的技术效果，此处不再赘述。
第三十二方面，提供一种策略控制系统，包括网络设备和第一会话管理网元；网络设备，用于确定正在建立的终端的第一会话与已建立的终端的第二会话具有相同的单个网络切片选择辅助信息S-NSSAI和数据网络名称DNN；网络设备，还用于向第一会话对应的第一会话管理网元发送第二会话对应的第二会话管理网元选择的策略控制网元的标识；第一会话管理网元，用于接收来自网络设备的策略控制网元的标识，并根据该策略控制网元的标识选择该策略控制网元。
在一种可能的设计中，该策略控制系统还包括第二会话管理网元；第二会话管理网元，用于在建立第二会话的过程中，选择策略控制网元，并向网络设备发送该策略控制网元的标识；网络设备，用于接收来自第二会话管理网元的该策略控制网元的标识。
其中，第三十二方面中任一种设计方式所带来的技术效果可参见上述第三方面中不同设计方式所带来的技术效果，此处不再赘述。
第三十三方面，提供了一种策略控制方法，该方法包括：第一会话管理网元接收来自统一数据管理网元的指示信息，该指示信息用于指示第一会话管理网元从绑定支持网元获取策略控制网元的标识；或者，该指示信息用于指示已建立与正在建立的终端的第一会话具有相同的单个网络切片选择辅助信息S-NSSAI和数据网络名称DNN的终端的会话；或者，该指示信息用于指示第一会话存在对应的绑定信息；第一会话管理网元根据该指示信息向绑定支持网元发送请求消息，该请求消息包括该终端的标识、该S-NSSAI和该DNN；第一会话管理网元接收来自绑定支持网元的策略控制网元的标识，并根据该策略控制网元的标识选择该策略控制网元。基于本申请实施例提供的策略控制方法，由于统一数据管理网元向第一会话管理网元发送指示信息，使得第一会话管理网元可以根据该指示信息，从绑定支持网元获取与该终端的标识、该S-NSSAI和该DNN对应的策略控制网元的标识，并根据策略控制网元的标识选择该策略控制网元，该策略控制网元可以为第二会话对应的策略控制网元。也就是说，可以保证为同一个终端的具有相同S-NSSAI和DNN的多个会话选择相同的策略控制网元，因此可以避免为同一个终端的具有相同S-NSSAI和DNN的多个PDU会话制定的策略与从统一数据库网元获取的签约信息相冲突的问题。
在一种可能的设计中，在第一会话管理网元接收来自统一数据管理网元的指示信息之前，该方法还包括：统一数据管理网元确定正在建立的终端的第一会话与已建立的终端的第二会话具有相同的S-NSSAI和DNN；统一数据管理网元向第一会话对应的第一会话管理网元发送指示信息。
在一种可能的设计中，在统一数据管理网元向第一会话管理网元发送该指示信息 之前，该方法还包括：统一数据管理网元确定该终端在非漫游或家乡路由场景下建立第一会话。
第三十四方面，提供了一种策略控制方法，该方法包括：统一数据管理网元接收来自第一会话管理网元的注册请求，该注册请求包括终端的标识、正在建立的该终端的第一会话对应的单个网络切片选择辅助信息S-NSSAI和数据网络名称DNN；统一数据管理网元向第一会话管理网元发送指示信息，该指示信息用于指示该第一会话管理网元从绑定支持网元获取策略控制网元的标识；或者，该指示信息用于指示已建立与该第一会话具有相同的S-NSSAI和DNN的该终端的会话；或者，该指示信息用于指示该第一会话存在对应的绑定信息。
在一种可能的设计中，在统一数据管理网元向该第一会话管理网元发送该指示信息之前，该方法还包括：统一数据管理网元确定正在建立的终端的第一会话与已建立的该终端的第二会话具有相同的S-NSSAI和DNN。
在一种可能的设计中，在统一数据管理网元向该第一会话管理网元发送该指示信息之前，方法还包括：统一数据管理网元确定该终端在非漫游或家乡路由场景下建立该第一会话。
其中，第三十四方面所带来的技术效果可参见上述第三十三方面，此处不再赘述。
第三十五方面，提供一种策略控制系统，包括：统一数据管理网元和第一会话管理网元；统一数据管理网元，用于向第一会话管理网元发送指示信息，该指示信息用于指示第一会话管理网元从绑定支持网元获取策略控制网元的标识；或者，该指示信息用于指示已建立与正在建立的终端的第一会话具有相同的单个网络切片选择辅助信息S-NSSAI和数据网络名称DNN的终端的会话；或者，该指示信息用于指示第一会话存在对应的绑定信息；第一会话管理网元，用于接收来自统一数据管理网元的该指示信息，并根据该指示信息向绑定支持网元发送请求消息，该请求消息包括该终端的标识、该S-NSSAI和该DNN；第一会话管理网元，还用于接收来自绑定支持网元的策略控制网元的标识，并根据该策略控制网元的标识选择该策略控制网元。
在一种可能的设计中，统一数据管理网元，还用于确定正在建立的终端的第一会话与已建立的终端的第二会话具有相同的S-NSSAI和DNN。
在一种可能的设计中，统一数据管理网元，还用于确定该终端在非漫游或家乡路由场景下建立第一会话。
其中，第三十五方面所带来的技术效果可参见上述第三十三方面，此处不再赘述。
第三十六方面，提供一种策略控制系统，包括：第一会话管理网元和第一策略控制网元；第一会话管理网元，用于接收来自移动管理网元的用于创建第一会话的第一请求消息，该第一请求消息包括终端的标识、单个网络切片选择辅助信息S-NSSAI和数据网络名称DNN；第一会话管理网元，还用于为该第一会话选择第一策略控制网元，并向第一策略控制网元发送策略控制创建请求，该策略控制创建请求包括该终端的标识、该S-NSSAI和该DNN；第一策略控制网元，用于接收来自第一会话管理网元的策略控制创建请求，并向绑定支持网元发送该终端的标识、该S-NSSAI、该DNN和该第一策略控制网元的标识；第一策略控制网元，还用于接收来自绑定支持网元的拒绝指示，并向第一会话管理网元发送该拒绝指示，该拒绝指示包括该终端的标识、该 S-NSSAI、该DNN和第二策略控制网元的标识；第一会话管理网元，用于接收该拒绝指示，并根据第二策略控制网元的标识为第一会话选择该第二策略控制网元。基于本申请实施例提供的策略控制系统，可以保证为同一个终端的具有相同S-NSSAI和DNN的多个会话选择相同的策略控制网元，因此可以避免为同一个终端的具有相同S-NSSAI和DNN的多个PDU会话制定的策略与从统一数据库网元获取的签约信息相冲突的问题。
第三十七方面，提供了一种策略控制方法，该方法包括：第一策略控制网元接收来自第一会话管理管理网元的策略控制创建请求，该策略控制创建请求包括终端的标识、单个网络切片选择辅助信息S-NSSAI和数据网络名称DNN；第一策略控制网元向绑定支持网元发送该终端的标识、该S-NSSAI、该DNN和该第一策略控制网元的标识；第一策略控制网元接收来自该绑定支持网元的第二策略控制网元的标识，并向该第一会话管理网元发送该第二策略控制网元的标识，该第二策略控制网元的标识为该绑定支持网元保存的与该终端的标识、该S-NSSAI和该DNN对应的策略控制网元的标识。基于本申请实施例提供的策略控制方法，可以保证为同一个终端的具有相同S-NSSAI和DNN的多个会话选择相同的策略控制网元，因此可以避免为同一个终端的具有相同S-NSSAI和DNN的多个PDU会话制定的策略与从统一数据库网元获取的签约信息相冲突的问题。
可选的，本申请实施例中，策略控制网元可以为策略控制功能网络功能实例(network function instance)或策略控制功能网络功能服务实例(network function service instance)。相应地，策略控制网元的标识可以为策略控制网元的网络功能实例标识(network fuction instance Id)或策略控制网元的网络功能服务实例标识(network fuction service Iinstance Id)，在此不作具体限定。
在一种可能的设计中，该方法还包括：第一策略控制网元确定需要为该终端的标识、该S-NSSAI和该DNN的组合选择相同的策略控制网元；第一策略控制网元向该绑定支持网元发送指示信息，该指示信息用于指示为该终端的标识、该S-NSSAI和该DNN的组合选择相同的策略控制网元。这样，绑定支持网元可以根据该指示信息，为该终端的标识、该S-NSSAI和该DNN的组合选择相同的策略控制网元。
第三十八方面，提供了一种策略控制方法，该方法包括：绑定支持网元接收来自第一策略控制网元的终端的标识、单个网络切片选择辅助信息S-NSSAI、数据网络名称DNN和该第一策略控制网元的标识；绑定支持网元确定已经存在与该该终端的标识、该S-NSSAI和该DNN的组合对应的第二策略控制网元的标识；绑定支持网元向该第一策略控制网元发送该第二策略控制网元的标识。基于本申请实施例提供的策略控制方法，可以保证为同一个终端的具有相同S-NSSAI和DNN的多个会话选择相同的策略控制网元，因此可以避免为同一个终端的具有相同S-NSSAI和DNN的多个PDU会话制定的策略与从统一数据库网元获取的签约信息相冲突的问题。
在一种可能的设计中，该方法还包括：在第二会话建立过程中，该绑定支持网元接收来自该第二策略控制网元的该终端的标识、该S-NSSAI、该DNN和该第二策略控制网元的标识；绑定支持网元存储该终端的标识、该S-NSSAI、该DNN和该第二策略控制网元的标识的对应关系。
在一种可能的设计中，该方法还包括：绑定支持网元接收来自该第一策略控制网 元的指示信息，该指示信息用于指示为该终端的标识、该S-NSSAI和该DNN的组合选择相同的策略控制网元；绑定支持网元根据该指示信息确定向该第一策略控制网元发送该第二策略控制网元的标识。
第三十九方面，提供了一种策略控制方法，包括：第一会话管理网元向第一策略控制网元发送策略控制创建请求，该策略控制创建请求包括终端的标识、单个网络切片选择辅助信息S-NSSAI和数据网络名称DNN；第一策略控制网元接收来自该第一会话管理网元的该策略控制创建请求，并向该绑定支持网元发送该终端的标识、该S-NSSAI、该DNN和该第一策略控制网元的标识；第一策略控制网元接收来自该绑定支持网元的第二策略控制网元的标识，并向该第一会话管理网元发送该第二策略控制网元的标识，该第二策略控制网元的标识为该绑定支持网元保存的与该终端的标识、该S-NSSAI和该DNN对应的策略控制网元的标识；第一会话管理网元接收来自该第一策略控制网元的该第二策略控制网元的标识，并根据该第二策略控制网元的标识为第一会话选择该第二策略控制网元。基于本申请实施例提供的策略控制方法，可以保证为同一个终端的具有相同S-NSSAI和DNN的多个会话选择相同的策略控制网元，因此可以避免为同一个终端的具有相同S-NSSAI和DNN的多个PDU会话制定的策略与从统一数据库网元获取的签约信息相冲突的问题。
在一种可能的设计中，该方法还包括：第一会话管理网元接收来自第一移动管理网元的用于创建第一会话的第一请求消息，该第一请求消息包括该终端的标识、该S-NSSAI和该DNN；第一会话管理网元为该第一会话选择该第一策略控制网元。
在一种可能的设计中，该方法还包括：第一策略控制网元确定需要为该终端的标识、该S-NSSAI和该DNN的组合选择相同的策略控制网元；第一策略控制网元向该绑定支持网元发送指示信息，该指示信息用于指示为该终端的标识、该S-NSSAI和该DNN的组合选择相同的策略控制网元。这样，绑定支持网元可以根据该指示信息，为该终端的标识、该S-NSSAI和该DNN的组合选择相同的策略控制网元。
在一种可能的设计中，第一策略控制网元向绑定支持网元发送指示信息，包括：第一策略控制网元在确定该终端在非漫游或家乡路由场景下建立该第一会话的情况下，向绑定支持网元发送指示信息。
在一种可能的设计中，该方法还包括：第二会话管理网元接收来自第二移动管理网元的用于创建第二会话的第二请求消息，该第二请求消息包括该终端的标识、该S-NSSAI和该DNN；第二会话管理网元为该第二会话选择该第二策略控制网元，并向该第二策略控制网元发送策略控制创建请求，该策略控制创建请求包括该终端的标识、该S-NSSAI和该DNN；第二策略控制网元接收来自该第二会话管理网元的该策略控制创建请求，并向该绑定支持网元发送该终端的标识、该S-NSSAI、该DNN和该第二策略控制网元的标识；绑定支持网元接收来自该第二策略控制网元的该终端的标识、该S-NSSAI、该DNN和该第二策略控制网元的标识，并存储该终端的标识、该S-NSSAI、该DNN和该第二策略控制网元的标识的对应关系。
第四十方面，提供了一种策略控制系统，包括：第一会话管理网元和第一策略控制网元；该第一会话管理网元，用于向该第一策略控制网元发送策略控制创建请求，该策略控制创建请求包括终端的标识、单个网络切片选择辅助信息S-NSSAI和数据网 络名称DNN；第一策略控制网元，用于接收来自该第一会话管理网元的该策略控制创建请求，并向该绑定支持网元发送该终端的标识、该S-NSSAI、该DNN和该第一策略控制网元的标识；第一策略控制网元，用于接收来自该绑定支持网元的第二策略控制网元的标识，并向该第一会话管理网元发送该第二策略控制网元的标识，该第二策略控制网元的标识为该绑定支持网元保存的与该终端的标识、该S-NSSAI和该DNN对应的策略控制网元的标识；第一会话管理网元，用于接收来自该第一策略控制网元的该第二策略控制网元的标识，并根据该第二策略控制网元的标识为第一会话选择该第二策略控制网元。基于本申请实施例提供的策略控制系统，可以保证为同一个终端的具有相同S-NSSAI和DNN的多个会话选择相同的策略控制网元，因此可以避免为同一个终端的具有相同S-NSSAI和DNN的多个PDU会话制定的策略与从统一数据库网元获取的签约信息相冲突的问题。
在一种可能的设计中，第一会话管理网元，还用于接收来自第一移动管理网元的用于创建第一会话的第一请求消息，该第一请求消息包括该终端的标识、该S-NSSAI和该DNN；第一会话管理网元，还用于为该第一会话选择该第一策略控制网元。
在一种可能的设计中，第一策略控制网元，还用于确定需要为该终端的标识、该S-NSSAI和该DNN的组合选择相同的策略控制网元；第一策略控制网元，还用于向该绑定支持网元发送指示信息，该指示信息用于指示为该终端的标识、该S-NSSAI和该DNN的组合选择相同的策略控制网元。这样，绑定支持网元可以根据该指示信息，为该终端的标识、该S-NSSAI和该DNN的组合选择相同的策略控制网元。
在一种可能的设计中，第一策略控制网元，还用于向该绑定支持网元发送指示信息，包括：第一策略控制网元，还用于在确定该终端在非漫游或家乡路由场景下建立第一会话的情况下，向该绑定支持网元发送指示信息。
在一种可能的设计中，该策略控制系统还包括第二会话管理网元、该第二策略控制网元和该绑定支持网元；第二会话管理网元，用于接收来自第二移动管理网元的用于创建第二会话的第二请求消息，该第二请求消息包括该终端的标识、该S-NSSAI和该DNN；第二会话管理网元，用于为该第二会话选择该第二策略控制网元，并向该第二策略控制网元发送策略控制创建请求，该策略控制创建请求包括该终端的标识、该S-NSSAI和该DNN；第二策略控制网元，用于接收来自该第二会话管理网元的该策略控制创建请求，并向该绑定支持网元发送该终端的标识、该S-NSSAI、该DNN和该第二策略控制网元的标识；绑定支持网元，用于接收来自该第二策略控制网元的该终端的标识、该S-NSSAI、该DNN和该第二策略控制网元的标识，并存储该终端的标识、该S-NSSAI、该DNN和该第二策略控制网元的标识的对应关系。
第四十一方面，提供了一种策略控制方法，该方法包括：第一策略控制网元接收来自第一会话管理网元的策略控制创建请求，该策略控制创建请求包括终端的标识、单个网络切片选择辅助信息S-NSSAI和数据网络名称DNN；第一策略控制网元向绑定支持网元发送该终端的标识、该S-NSSAI、该DNN和该第一策略控制网元所属的第一策略控制网元组标识；第一策略控制网元接收来自该绑定支持网元的第二策略控制网元组标识，并向该第一会话管理网元发送该第二策略控制网元组标识，该第二策略控制网元组标识为该绑定支持网元保存的与该终端的标识、该S-NSSAI和该DNN对应的 策略控制网元组标识。基于本申请实施例提供的策略控制方法，可以保证为同一个终端的具有相同S-NSSAI和DNN的多个会话选择相同的策略控制网元组，因此可以避免为同一个终端的具有相同S-NSSAI和DNN的多个PDU会话制定的策略与从统一数据库网元获取的签约信息相冲突的问题。
可选的，本申请实施例中，策略控制网元组为策略控制网元的网络功能组(network fuction set)或策略控制网元的网络功能服务组(network fuction service set)。相应地，策略控制网元组标识为策略控制网元的网络功能组标识(network fuction set Id)或策略控制网元的网络功能服务组标识(network fuction service set Id)，在此不作具体限定。
在一种可能的设计中，该方法还包括：第一策略控制网元确定需要为该终端的标识、该S-NSSAI和该DNN的组合选择相同的策略控制网元组；第一策略控制网元向该绑定支持网元发送指示信息，该指示信息用于指示为该终端的标识、该S-NSSAI和该DNN的组合选择相同的策略控制网元组。这样，绑定支持网元可以根据该指示信息，为该终端的标识、该S-NSSAI和该DNN的组合选择相同的策略控制网元组。
第四十二方面，提供了一种策略控制方法，该方法包括：绑定支持网元接收来自第一策略控制网元的终端的标识、单个网络切片选择辅助信息S-NSSAI、数据网络名称DNN和该第一策略控制网元所属的第一策略控制网元组标识；绑定支持网元确定已经存在与该该终端的标识、该S-NSSAI和该DNN的组合对应的第二策略控制网元组标识；绑定支持网元向该第一策略控制网元发送该第二策略控制网元组标识。基于本申请实施例提供的策略控制方法，可以保证为同一个终端的具有相同S-NSSAI和DNN的多个会话选择相同的策略控制网元组，因此可以避免为同一个终端的具有相同S-NSSAI和DNN的多个PDU会话制定的策略与从统一数据库网元获取的签约信息相冲突的问题。
在一种可能的设计中，该方法还包括：在第二会话建立过程中，该绑定支持网元接收来自第二策略控制网元的该终端的标识、该S-NSSAI、该DNN和该第二策略控制网元所属的该第二策略控制网元组标识；绑定支持网元存储该终端的标识、该S-NSSAI、该DNN和该第二策略控制网元组标识的对应关系。
在一种可能的设计中，该方法还包括：绑定支持网元接收来自该第一策略控制网元的指示信息，该指示信息用于指示为该终端的标识、该S-NSSAI和该DNN的组合选择相同的策略控制网元组；绑定支持网元根据该指示信息确定向该第一策略控制网元发送该第二策略控制网元组标识。
第四十三方面，提供了一种策略控制方法，包括：第一会话管理网元向第一策略控制网元发送策略控制创建请求，该策略控制创建请求包括终端的标识、单个网络切片选择辅助信息S-NSSAI和数据网络名称DNN；第一策略控制网元接收来自该第一会话管理网元的该策略控制创建请求，并向该绑定支持网元发送该终端的标识、该S-NSSAI、该DNN和该第一策略控制网元所属的第一策略控制网元组标识；第一策略控制网元接收来自该绑定支持网元的第二策略控制网元组标识，并向该第一会话管理网元发送该第二策略控制网元组标识，该第二策略控制网元组标识为该绑定支持网元保存的与该终端的标识、该S-NSSAI和该DNN对应的策略控制网元组标识；第一会话管 理网元接收来自该第一策略控制网元的该第二策略控制网元组标识，并根据该第二策略控制网元组标识为第一会话选择第二策略控制网元，该第二策略控制网元属于该第二策略控制网元组。基于本申请实施例提供的策略控制方法，可以保证为同一个终端的具有相同S-NSSAI和DNN的多个会话选择相同的策略控制网元组，因此可以避免为同一个终端的具有相同S-NSSAI和DNN的多个PDU会话制定的策略与从统一数据库网元获取的签约信息相冲突的问题。
在一种可能的设计中，该方法还包括：第一会话管理网元接收来自第一移动管理网元的用于创建第一会话的第一请求消息，该第一请求消息包括该终端的标识、该S-NSSAI和该DNN；第一会话管理网元为该第一会话选择该第一策略控制网元。
在一种可能的设计中，该方法还包括：该第一策略控制网元确定需要为该终端的标识、该S-NSSAI和该DNN的组合选择相同的策略控制网元组；该第一策略控制网元向该绑定支持网元发送指示信息，该指示信息用于指示为该终端的标识、该S-NSSAI和该DNN的组合选择相同的策略控制网元组。这样，绑定支持网元可以根据该指示信息，为该终端的标识、该S-NSSAI和该DNN的组合选择相同的策略控制网元组。
在一种可能的设计中，第一策略控制网元向绑定支持网元发送指示信息，包括：第一策略控制网元在确定该终端在非漫游或家乡路由场景下建立该第一会话的情况下，向绑定支持网元发送指示信息。
在一种可能的设计中，该方法还包括：第二会话管理网元接收来自第二移动管理网元的用于创建第二会话的第二请求消息，该第二请求消息包括该终端的标识、该S-NSSAI和该DNN；第二会话管理网元为该第二会话选择该第二策略控制网元，并向该第二策略控制网元发送策略控制创建请求，该策略控制创建请求包括该终端的标识、该S-NSSAI和该DNN；第二策略控制网元接收来自该第二会话管理网元的该策略控制创建请求，并向该绑定支持网元发送该终端的标识、该S-NSSAI、该DNN和该第二策略控制网元所属的第二策略控制网元组标识；绑定支持网元接收来自该第二策略控制网元的该终端的标识、该S-NSSAI、该DNN和该第二策略控制网元组标识，并存储该终端的标识、该S-NSSAI、该DNN和该第二策略控制网元组标识的对应关系。
第四十四方面，提供了一种策略控制系统，包括：第一会话管理网元和第一策略控制网元；第一会话管理网元，用于向第一策略控制网元发送策略控制创建请求，该策略控制创建请求包括终端的标识、单个网络切片选择辅助信息S-NSSAI和数据网络名称DNN；第一策略控制网元，用于接收来自该第一会话管理网元的该策略控制创建请求，并向该绑定支持网元发送该终端的标识、该S-NSSAI、该DNN和该第一策略控制网元所属的第一策略控制网元组标识；第一策略控制网元，用于接收来自该绑定支持网元的第二策略控制网元组标识，并向该第一会话管理网元发送该第二策略控制网元组标识，该第二策略控制网元组标识为该绑定支持网元保存的与该终端的标识、该S-NSSAI和该DNN对应的策略控制网元组标识；第一会话管理网元，用于接收来自该第一策略控制网元的该第二策略控制网元组标识，并根据该第二策略控制网元组标识为第一会话选择第二策略控制网元，该第二策略控制网元属于该第二策略控制网元组。基于本申请实施例提供的策略控制系统，可以保证为同一个终端的具有相同S-NSSAI和DNN的多个会话选择相同的策略控制网元组，因此可以避免为同一个终端的具有相 同S-NSSAI和DNN的多个PDU会话制定的策略与从统一数据库网元获取的签约信息相冲突的问题。
在一种可能的设计中，第一会话管理网元，还用于接收来自第一移动管理网元的用于创建第一会话的第一请求消息，该第一请求消息包括该终端的标识、该S-NSSAI和该DNN；第一会话管理网元，还用于为该第一会话选择该第一策略控制网元。
在一种可能的设计中，该第一策略控制网元，还用于确定需要为该终端的标识、该S-NSSAI和该DNN的组合选择相同的策略控制网元组；该第一策略控制网元，还用于向该绑定支持网元发送指示信息，该指示信息用于指示为该终端的标识、该S-NSSAI和该DNN的组合选择相同的策略控制网元组。这样，绑定支持网元可以根据该指示信息，为该终端的标识、该S-NSSAI和该DNN的组合选择相同的策略控制网元组。
在一种可能的设计中，第一策略控制网元，还用于向该绑定支持网元发送指示信息，包括：第一策略控制网元，还用于在确定该终端在非漫游或家乡路由场景下建立第一会话的情况下，向该绑定支持网元发送指示信息。
在一种可能的设计中，该策略控制系统还包括第二会话管理网元、该第二策略控制网元和该绑定支持网元；第二会话管理网元，用于接收来自第二移动管理网元的用于创建第二会话的第二请求消息，该第二请求消息包括该终端的标识、该S-NSSAI和该DNN；第二会话管理网元，用于为该第二会话选择该第二策略控制网元，并向该第二策略控制网元发送策略控制创建请求，该策略控制创建请求包括该终端的标识、该S-NSSAI和该DNN；第二策略控制网元，用于接收来自该第二会话管理网元的该策略控制创建请求，并向该绑定支持网元发送该终端的标识、该S-NSSAI、该DNN和该第二策略控制网元所属的第二策略控制网元组标识；绑定支持网元，用于接收来自该第二策略控制网元的该终端的标识、该S-NSSAI、该DNN和该第二策略控制网元组标识，并存储该终端的标识、该S-NSSAI、该DNN和该第二策略控制网元组标识的对应关系。
第四十五方面，提供了一种通信装置用于实现上述各种方法。该通信装置可以为上述第三十七方面或第四十一方面中的第一策略控制网元，或者包含上述第一策略控制网元的装置；或者，该通信装置可以为上述第三十八方面或第四十二方面中的绑定支持网元，或者包含上述绑定支持网元的装置。该通信装置包括实现上述方法相应的模块、单元、或手段(means)，该模块、单元、或means可以通过硬件实现，软件实现，或者通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的模块或单元。
第四十六方面，提供了一种通信装置，包括：处理器和存储器；该存储器用于存储计算机指令，当该处理器执行该指令时，以使该通信装置执行上述任一方面所述的方法。该通信装置可以为上述第三十七方面或第四十一方面中的第一策略控制网元，或者包含上述第一策略控制网元的装置；或者，该通信装置可以为上述第三十八方面或第四十二方面中的绑定支持网元，或者包含上述绑定支持网元的装置。
第四十七方面，提供了一种通信装置，包括：处理器；该处理器用于与存储器耦合，并读取存储器中的指令之后，根据该指令执行如上述任一方面所述的方法。该通信装置可以为上述第三十七方面或第四十一方面中的第一策略控制网元，或者包含上述第一策略控制网元的装置；或者，该通信装置可以为上述第三十八方面或第四十二 方面中的绑定支持网元，或者包含上述绑定支持网元的装置。
第四十八方面，提供了一种计算机可读存储介质，该计算机可读存储介质中存储有指令，当其在计算机上运行时，使得计算机可以执行上述任一方面所述的方法。
第四十九方面，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，使得计算机可以执行上述任一方面所述的方法。
第五十方面，提供了一种通信装置(例如，该通信装置可以是芯片或芯片系统)，该通信装置包括处理器，用于实现上述任一方面中所涉及的功能。在一种可能的设计中，该通信装置还包括存储器，该存储器，用于保存必要的程序指令和数据。该通信装置是芯片系统时，可以由芯片构成，也可以包含芯片和其他分立器件。
其中，第四十五方面至第五十方面中任一种设计方式所带来的技术效果可参见上述第三十八方面至第四十四方面中不同设计方式所带来的技术效果，此处不再赘述。
本申请的这些方面或其他方面在以下实施例的描述中会更加简明易懂。
附图说明
图1为本申请实施例提供的策略控制系统的架构示意图一；
图2为本申请实施例提供的策略控制系统的架构示意图二；
图2a为本申请实施例提供的策略控制系统的架构示意图三；
图2b为本申请实施例提供的策略控制系统的架构示意图四；
图3a为本申请实施例提供的策略控制系统在非漫游5G网络架构中的应用示意图；
图3b为本申请实施例提供的策略控制系统在家乡路由5G网络架构中的应用示意图；
图4为本申请实施例提供的通信设备的硬件结构示意图；
图5为本申请实施例提供的策略控制方法的流程示意图一；
图6为本申请实施例提供的策略控制方法的流程示意图二；
图7为本申请实施例提供的策略控制方法的流程示意图三；
图8为本申请实施例提供的一种移动管理网元的结构示意图；
图9为本申请实施例提供的一种网络设备的结构示意图；
图10为本申请实施例提供的一种第一会话管理网元的结构示意图；
图11为本申请实施例提供的一种第二会话管理网元的结构示意图；
图12为本申请实施例提供的策略控制方法的流程示意图四；
图13为本申请实施例提供的策略控制方法的流程示意图五；
图14为本申请实施例提供的策略控制方法的流程示意图六；
图15为本申请实施例提供的一种统一数据管理网元的结构示意图；
图16为本申请实施例提供的一种第一策略控制网元的结构示意图；
图17为本申请实施例提供的一种绑定支持网元的结构示意图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行描述。其中，在本申请的描述中，除非另有说明，“/”表示前后关联的对象是一种“或”的关系，例如，A/B可以表示A或B；本申请中的“和/或”仅仅是一种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，其中A,B可以是单数或者复数。并且，在本申请的描述中，除非另有说明，“多个”是指两个或多于两个。“以下至少一项(个)”或其类似表达，是指的这些项中的任意组合，包括单项(个)或复数项(个)的任意组合。例如，a，b，或c中的至少一项(个)，可以表示：a，b，c，a-b，a-c，b-c，或a-b-c，其中a，b，c可以是单个，也可以是多个。另外，为了便于清楚描述本申请实施例的技术方案，在本申请的实施例中，采用了“第一”、“第二”等字样对功能和作用基本相同的相同项或相似项进行区分。本领域技术人员可以理解“第一”、“第二”等字样并不对数量和执行次序进行限定，并且“第一”、“第二”等字样也并不限定一定不同。
此外，本申请实施例描述的网络架构以及业务场景是为了更加清楚的说明本申请实施例的技术方案，并不构成对于本申请实施例提供的技术方案的限定，本领域普通技术人员可知，随着网络架构的演变和新业务场景的出现，本申请实施例提供的技术方案对于类似的技术问题，同样适用。
如图1所示，为本申请实施例提供的一种策略控制系统10，该策略控制系统10包括移动管理网元101和第一会话管理网元102。
移动管理网元101，用于向第一会话管理网元102发送用于创建第一会话的第一请求消息，该第一请求消息包括终端的标识、S-NSSAI和DNN。
第一会话管理网元102，用于接收来自移动管理网元101的用于创建第一会话的第一请求消息，并向绑定支持网元发送第二请求消息，该第二请求消息包括终端的标识、S-NSSAI和DNN。
第一会话管理网元102，还用于接收来自绑定支持网元的策略控制网元的标识，并根据策略控制网元的标识选择该策略控制网元。
其中，本申请实施例中，该请求消息用于请求对应的策略控制网元的标识，该策略控制网元可以为第二会话对应的策略控制网元，本申请实施例对此不作具体限定。
可选的，移动管理网元101，还用于在向第一会话管理网元102发送用于创建第一会话的第一请求消息之前，确定正在建立的终端的第一会话与已建立的终端的第二会话具有相同的S-NSSAI和DNN。相应的，第一请求消息还包括指示信息，该指示信息用于指示第一会话管理网元102从绑定支持网元获取策略控制网元的标识；或者，该指示信息用于指示已建立与第一会话具有相同的S-NSSAI和DNN的终端的会话。
可选的，本申请实施例中的会话例如可以为PDU会话，在此统一说明，本申请实施例对此不作具体限定。
可选的，本申请实施例中，移动管理网元101和第一会话管理网元102之间可以直接通信，也可以通过其他设备的转发进行通信，本申请实施例对此不作具体限定。
基于本申请实施例提供的策略控制系统，由于移动管理网元可以向第一会话管理网元发送用于创建第一会话的第一请求消息，该第一请求消息包括终端的标识、S-NSSAI和DNN。进而，第一会话管理网元可以根据终端的标识、S-NSSAI和DNN，从绑定支持网元获取对应的策略控制网元的标识，并根据策略控制网元的标识选择该策略控制网元，该策略控制网元可以为第二会话对应的策略控制网元。也就是说，可以保证为同一个终端的具有相同S-NSSAI和DNN的多个会话选择相同的策略控制网元， 因此可以避免为同一个终端的具有相同S-NSSAI和DNN的多个PDU会话制定的策略与从统一数据库网元获取的签约信息相冲突的问题。
可选的，如图1所示，本申请实施例提供的策略控制系统10还可以包括第二会话管理网元103。
移动管理网元101，还用于向第二会话管理网元103发送用于创建第二会话的第三请求消息。
第二会话管理网元103，用于接收来自移动管理网元101的用于创建第二会话的第三请求消息，进而选择策略控制网元，并向绑定支持网元发送注册请求，该注册请求包括终端的标识、S-NSSAI、DNN和策略控制网元的标识。
可选的，本申请实施例中，移动管理网元101和第二会话管理网元103之间可以直接通信，也可以通过其他设备的转发进行通信，本申请实施例对此不作具体限定。
或者，如图2所示，为本申请实施例提供的一种策略控制系统20，该策略控制系统20包括网络设备201和第一会话管理网元202。
网络设备201，用于确定正在建立的终端的第一会话与已建立的终端的第二会话具有相同的S-NSSAI和DNN，进而向第一会话对应的第一会话管理网元202发送第二会话对应的第二会话管理网元选择的策略控制网元的标识。
第一会话管理网元202，用于接收来自网络设备201的策略控制网元的标识，并根据策略控制网元的标识选择策略控制网元。
可选的，本申请实施例中的网络设备例如可以是统一数据管理网元或移动管理网元，本申请实施例对此不作具体限定。
可选的，本申请实施例中，网络设备201和第一会话管理网元202之间可以直接通信，也可以通过其他设备的转发进行通信，本申请实施例对此不作具体限定。
基于本申请实施例提供的策略控制系统，由于网络设备在确定正在建立的终端的第一会话与已建立的终端的第二会话具有相同的S-NSSAI和DNN之后，向第一会话管理网元发送第二会话对应的第二会话管理网元选择的策略控制网元的标识，使得第二会话管理网元可以根据该策略控制网元的标识选择对应的策略控制网元。也就是说，可以保证为同一个终端的具有相同S-NSSAI和DNN的多个会话选择相同的策略控制网元，因此可以避免为同一个终端的具有相同S-NSSAI和DNN的多个PDU会话制定的策略与从统一数据库网元获取的签约信息相冲突的问题。
可选的，如图2所示，本申请实施例提供的策略控制系统20还可以包括第二会话管理网元203。
第二会话管理网元203，用于在建立第二会话的过程中，选择策略控制网元，并向网络设备201发送策略控制网元的标识。
网络设备201，用于接收来自第二会话管理网元的策略控制网元的标识。
可选的，本申请实施例中，网络设备201和第二会话管理网元203之间可以直接通信，也可以通过其他设备的转发进行通信，本申请实施例对此不作具体限定。
或者，如图2a所示，为本申请实施例提供的一种策略控制系统20a，该策略控制系统20a包括统一数据管理网元204和第一会话管理网元205。
其中，统一数据管理网元204，用于确定正在建立的终端的第一会话与已建立的 终端的第二会话具有相同的S-NSSAI和DNN。
统一数据管理网元204，还用于向第一会话对应的第一会话管理网元205发送指示信息，该指示信息用于指示第一会话管理网元205从绑定支持网元获取策略控制网元的标识；或者，该指示信息用于指示已建立与第一会话具有相同的S-NSSAI和DNN的终端的会话；或者，该指示信息用于指示第一会话存在对应的绑定信息。
第一会话管理网元205，用于接收来自统一数据管理网元204的该指示信息，并根据该指示信息向绑定支持网元发送请求消息，该请求消息包括该终端的标识、该S-NSSAI和该DNN。
第一会话管理网元205，还用于接收来自绑定支持网元的策略控制网元的标识，并根据该策略控制网元的标识选择该策略控制网元。
可选的，本申请实施例中，统一数据管理网元204和第一会话管理网元205之间可以直接通信，也可以通过其他设备的转发进行通信，本申请实施例对此不作具体限定。
基于本申请实施例提供的策略控制系统，由于统一数据管理网元确定正在建立的终端的第一会话与已建立的该终端的第二会话具有相同的S-NSSAI和DNN之后，可以向第一会话管理网元发送指示信息，使得第一会话管理网元可以根据该指示信息，从绑定支持网元获取与该终端的标识、该S-NSSAI和该DNN对应的策略控制网元的标识，并根据策略控制网元的标识选择该策略控制网元，该策略控制网元可以为第二会话对应的策略控制网元。也就是说，可以保证为同一个终端的具有相同S-NSSAI和DNN的多个会话选择相同的策略控制网元，因此可以避免为同一个终端的具有相同S-NSSAI和DNN的多个PDU会话制定的策略与从统一数据库网元获取的签约信息相冲突的问题。
或者，如图2b所示，为本申请实施例提供的一种策略控制系统20b，该策略控制系统20b包括第一策略控制网元206和第一会话管理网元207。
其中，一种可能的实现方式中，第一会话管理网元207，用于接收来自移动管理网元的用于创建第一会话的第一请求消息，该第一请求消息包括终端的标识、S-NSSAI和DNN。
第一会话管理网元207，还用于为该第一会话选择第一策略控制网元206，并向第一策略控制网元206发送策略控制创建请求，该策略控制创建请求包括该终端的标识、该S-NSSAI和该DNN。
第一策略控制网元206，用于接收来自第一会话管理网元207的策略控制创建请求，并向绑定支持网元发送该终端的标识、该S-NSSAI、该DNN和该第一策略控制网元206的标识。
第一策略控制网元206，还用于接收来自绑定支持网元的拒绝指示，并向第一会话管理网元207发送该拒绝指示，该拒绝指示包括该终端的标识、该S-NSSAI、该DNN和第二策略控制网元的标识。
第一会话管理网元207，用于接收该拒绝指示，并根据第二策略控制网元的标识为第一会话选择该第二策略控制网元。
或者，另一种可能的实现方式中，第一会话管理网元207，用于向第一策略控制网元206发送策略控制创建请求，该策略控制创建请求包括终端的标识、S-NSSAI和 DNN；第一策略控制网元206，用于接收来自该第一会话管理网元207的该策略控制创建请求，并向绑定支持网元发送该终端的标识、该S-NSSAI、该DNN和该第一策略控制网元的标识；第一策略控制网元206，用于接收来自绑定支持网元的第二策略控制网元的标识，并向该第一会话管理网元207发送该第二策略控制网元的标识，该第二策略控制网元的标识为该绑定支持网元保存的与该终端的标识、该S-NSSAI和该DNN对应的策略控制网元的标识；第一会话管理网元207，用于接收来自第一策略控制网元206的第二策略控制网元的标识，并根据第二策略控制网元的标识为第一会话选择第二策略控制网元。
或者，再一种可能的实现方式中，第一会话管理网元207，用于向第一策略控制网元206发送策略控制创建请求，该策略控制创建请求包括终端的标识、S-NSSAI和DNN；第一策略控制网元206，用于接收来自第一会话管理网元207的策略控制创建请求，并向绑定支持网元发送该终端的标识、该S-NSSAI、该DNN和第一策略控制网元206所属的第一策略控制网元组标识；第一策略控制网元206，用于接收来自绑定支持网元的第二策略控制网元组标识，并向第一会话管理网元207发送第二策略控制网元组标识，该第二策略控制网元组标识为该绑定支持网元保存的与该终端的标识、该S-NSSAI和该DNN对应的策略控制网元组标识；第一会话管理网元207，用于接收来自第一策略控制网元206的第二策略控制网元组标识，并根据第二策略控制网元组标识为第一会话选择第二策略控制网元，该第二策略控制网元属于该第二策略控制网元组。
可选的，本申请实施例中，第一策略控制网元206和第一会话管理网元207之间可以直接通信，也可以通过其他设备的转发进行通信，本申请实施例对此不作具体限定。
基于本申请实施例提供的策略控制系统，可以保证为同一个终端的具有相同S-NSSAI和DNN的多个会话选择相同的策略控制网元，因此可以避免为同一个终端的具有相同S-NSSAI和DNN的多个PDU会话制定的策略与从统一数据库网元获取的签约信息相冲突的问题。
可选的，图1或图2或图2a或图2b所示的策略控制系统可以应用于目前的5G网络架构以及未来其它的网络架构，本申请实施例对此不作具体限定。
示例性的，假设图1所示的策略控制系统10或者图2所示的策略控制系统20或图2a所示的策略控制系统20a或者图2b所示的策略控制系统20b应用于目前的非漫游5G网络架构，则如图3a所示，上述的第一会话管理网元或第二会话管理网元所对应的网元或者实体可以为该非漫游5G网络架构中的SMF网元；上述的统一数据管理网元所对应的网元或者实体可以为该非漫游5G网络架构中的统一数据管理(unified data management，UDM)网元；上述的移动管理网元所对应的网元或者实体可以为该非漫游5G网络架构中的AMF网元；上述的绑定支持网元所对应的网元或者实体可以为该非漫游5G网络架构中的绑定支持功能(binding support function，BSF)网元，上述的第一策略控制网元所对应的网元或者实体可以为该非漫游5G网络架构中的PCF网元。
此外，如图3a所示，该非漫游5G网络架构中还可以包括接入设备、用户面功能(user plane function，UPF)网元、或者UDR网元等，本申请实施例对此不作具体 限定。
其中，终端通过下一代网络(Next generation，N)1接口(简称N1)与AMF网元通信，接入设备通过N2接口(简称N2)与AMF网元通信，接入设备通过N3接口(简称N3)与UPF网元通信，AMF网元通过N11接口(简称N11)与SMF网元通信，AMF网元通过N8接口(简称N8)与UDM网元通信，SMF网元通过N7接口(简称N7)与PCF网元通信，SMF网元通过N 4接口(简称N4)与UPF网元通信，SMF网元通过N10接口(简称N10)与UDM网元通信，UDM网元与UDR网元通信，PCF网元与UDR网元通信，BSF网元与PCF网元和SMF网元通信。
需要说明的是，图3a仅是示例性的给出一个SMF网元和UPF网元。当然，该非漫游5G网络架构中可能包括多个SMF网元和UPF网元，如包括SMF1网元和SMF2网元，其中，SMF1网元与UPF1网元通信，SMF2网元与UPF2网元通信，本申请实施例对此不作具体限定。其中，各个网元之间的连接方式可参考图3a所示的非漫游5G网络架构，在此不再一一赘述。
或者，示例性的，假设图1所示的策略控制系统10或者图2所示的策略控制系统20或图2a所示的策略控制系统20a或者图2b所示的策略控制系统20b应用于目前的家乡路由5G网络架构，则如图3b所示，上述的第一会话管理网元或第二会话管理网元所对应的网元或者实体可以为该家乡路由5G网络架构中的归属地SMF(home SMF，H-SMF)网元；上述的统一数据管理网元所对应的网元或者实体可以为该家乡路由5G网络架构中的UDM网元；上述的移动管理网元所对应的网元或者实体可以为该家乡路由5G网络架构中的AMF网元；上述的绑定支持网元所对应的网元或者实体可以为该家乡路由5G网络架构中的BSF网元，上述的第一策略控制网元所对应的网元或者实体可以为该家乡路由5G网络架构中的PCF网元。
此外，如图3b所示，该家乡路由5G网络架构中还可以包括接入设备、拜访地SMF(visited SMF，V-SMF)网元、归属地UPF(home UPF，H-UPF)网元、拜访地UPF(visited UPF，V-UPF)网元、或者UDR网元等，本申请实施例对此不作具体限定。其中，终端、接入设备、AMF网元、V-SMF网元以及V-UPF网元归属于拜访地公共陆地移动网(visited public land mobile network，VPLMN)中；UDM网元、UDR网元、H-SMF网元、PCF网元、H-UPF网元以及BSF网元归属于归属公共陆地移动网(home public land mobile network，HPLMN)中。
如图3b所示，终端通过N1与AMF网元通信，接入设备通过N2与AMF网元通信，接入设备通过N3与V-UPF网元通信，V-UPF网元通过N9接口(简称N9)与H-UPF网元通信，AMF网元通过N11与V-SMF网元通信，AMF网元通过N8与UDM网元通信，V-SMF网元通过N16接口(简称N16)与H-SMF网元通信，H-SMF网元通过N7与PCF网元通信，H-SMF网元通过N4与H-UPF网元通信，V-SMF网元通过N4与V-UPF网元通信，H-SMF网元通过N10与UDM网元通信，PCF网元与UDR网元通信，BSF网元与PCF网元和H-SMF网元通信。
需要说明的是，图3b仅是示意性的给出一个V-SMF网元、一个H-SMF网元、一个H-UPF网元以及一个V-UPF网元。当然，该家乡路由5G网络架构中可能包括多个V-SMF网元、多个H-SMF网元、多个V-UPF网元以及多个H-UPF网元，如包括V-SMF1网元、 以及与V-SMF1网元通信的H-SMF1网元，V-SMF2网元、以及与V-SMF2网元通信的H-SMF2网元等，其中，V-SMF1网元与V-UPF1网元通信，V-SMF2网元与V-UPF2网元通信，H-SMF1网元与H-UPF1网元通信，H-SMF2网元与H-UPF2网元通信，本申请实施例对此不作具体限定。其中，各个网元之间的连接方式可参考图3b所示的家乡路由5G网络架构，在此不再一一赘述。
需要说明的是，图3a或者图3b中的各个网元或者各个网元之间的接口名字只是一个示例，具体实现中网元名字或者接口名字可能为其他名字，本申请实施例对此不作具体限定。
此外，需要说明的是，图3a所示的非漫游5G网络架构或图3b所示的家乡路由5G网络架构中的AMF网元、SMF网元、H-SMF网元、V-SMF网元、UDM网元、UDR网元、或者PCF网元等控制面网元也可以采用服务化接口进行交互。比如，AMF网元对外提供的服务化接口可以为Namf；SMF网元对外提供的服务化接口可以为Nsmf；H-SMF网元对外提供的服务化接口可以为Nhsmf；V-SMF网元对外提供的服务化接口可以为Nvsmf；UDM网元对外提供的服务化接口可以为Nudm；UDR网元对外提供的服务化接口可以为Nudr；PCF网元对外提供的服务化接口可以为Npcf；BSF网元对外提供的服务化接口可以为Nbsf。相关描述可以参考23501标准中的5G系统架构(5G system architecture)图，在此不予赘述。
可选的，本申请实施例中所涉及到的终端(terminal)可以包括各种具有无线通信功能的手持设备、车载设备、可穿戴设备、计算设备或连接到无线调制解调器的其它处理设备；还可以包括用户单元(subscriber unit)、蜂窝电话(cellular phone)、智能电话(smart phone)、无线数据卡、个人数字助理(personal digital assistant，PDA)电脑、平板型电脑、无线调制解调器(modem)、手持设备(handheld)、膝上型电脑(laptop computer)、无绳电话(cordless phone)或者无线本地环路(wireless local loop，WLL)台、机器类型通信(machine type communication，MTC)终端、用户设备(user equipment，UE)，移动台(mobile station，MS)，终端设备(terminal device)或者中继用户设备等。其中，中继用户设备例如可以是5G家庭网关(residential gateway，RG)。为方便描述，本申请中，上面提到的设备统称为终端。
可选的，本申请实施例中所涉及的接入设备指的是接入核心网的设备，例如可以是基站，宽带网络业务网关(broadband network gateway，BNG)，汇聚交换机，非第三代合作伙伴计划(3rd generation partnership project，3GPP)接入设备等。基站可以包括各种形式的基站，例如：宏基站，微基站(也称为小站)，中继站，接入点等。
可选的，本申请实施例图1中的移动管理网元或第一会话管理网元，或者图2中的网络设备或者第一会话管理网元，或者图2a中的统一数据管理网元或者第一会话管理网元，或者图2b中的第一策略控制网元或者第一会话管理网元可以由一个设备实现，也可以由多个设备共同实现，还可以是一个设备内的一个功能模块，本申请实施例对此不作具体限定。可以理解的是，上述功能既可以是硬件设备中的网络元件，也可以是在专用硬件上运行的软件功能，或者是平台(例如，云平台)上实例化的虚拟化功能。
例如，本申请实施例图1中的移动管理网元或第一会话管理网元，或者图2中的 网络设备或者第一会话管理网元，或者图2a中的统一数据管理网元或者第一会话管理网元，或者图2b中的第一策略控制网元或者第一会话管理网元可以通过图4中的通信设备来实现。图4所示为本申请实施例提供的通信设备的硬件结构示意图。该通信设备400包括处理器401，通信线路402，存储器403以及至少一个通信接口(图4中仅是示例性的以包括通信接口404为例进行说明)。
处理器401可以是一个通用中央处理器(central processing unit，CPU)，微处理器，特定应用集成电路(application-specific integrated circuit，ASIC)，或一个或多个用于控制本申请方案程序执行的集成电路。
通信线路402可包括一通路，在上述组件之间传送信息。
通信接口404，使用任何收发器一类的装置，用于与其他设备或通信网络通信，如以太网，无线接入网(radio access network，RAN)，无线局域网(wireless local area networks，WLAN)等。
存储器403可以是只读存储器(read-only memory，ROM)或可存储静态信息和指令的其他类型的静态存储设备，随机存取存储器(random access memory，RAM)或者可存储信息和指令的其他类型的动态存储设备，也可以是电可擦可编程只读存储器(electrically erasable programmable read-only memory，EEPROM)、只读光盘(compact disc read-only memory，CD-ROM)或其他光盘存储、光碟存储(包括压缩光碟、激光碟、光碟、数字通用光碟、蓝光光碟等)、磁盘存储介质或者其他磁存储设备、或者能够用于携带或存储具有指令或数据结构形式的期望的程序代码并能够由计算机存取的任何其他介质，但不限于此。存储器可以是独立存在，通过通信线路402与处理器相连接。存储器也可以和处理器集成在一起。
其中，存储器403用于存储执行本申请方案的计算机执行指令，并由处理器401来控制执行。处理器401用于执行存储器403中存储的计算机执行指令，从而实现本申请下述实施例提供的策略控制方法。
可选的，本申请实施例中的计算机执行指令也可以称之为应用程序代码，本申请实施例对此不作具体限定。
在具体实现中，作为一种实施例，处理器401可以包括一个或多个CPU，例如图4中的CPU0和CPU1。
在具体实现中，作为一种实施例，通信设备400可以包括多个处理器，例如图4中的处理器401和处理器408。这些处理器中的每一个可以是一个单核(single-CPU)处理器，也可以是一个多核(multi-CPU)处理器。这里的处理器可以指一个或多个设备、电路、和/或用于处理数据(例如计算机程序指令)的处理核。
在具体实现中，作为一种实施例，通信设备400还可以包括输出设备405和输入设备406。输出设备405和处理器401通信，可以以多种方式来显示信息。例如，输出设备405可以是液晶显示器(liquid crystal display，LCD)，发光二级管(light emitting diode，LED)显示设备，阴极射线管(cathode ray tube，CRT)显示设备，或投影仪(projector)等。输入设备406和处理器401通信，可以以多种方式接收用户的输入。例如，输入设备406可以是鼠标、键盘、触摸屏设备或传感设备等。
上述的通信设备400可以是一个通用设备或者是一个专用设备。在具体实现中， 通信设备400可以是台式机、便携式电脑、网络服务器、掌上电脑(personal digital assistant，PDA)、移动手机、平板电脑、无线终端设备、嵌入式设备或有图4中类似结构的设备。本申请实施例不限定通信设备400的类型。
下面将结合图1至图4对本申请实施例提供的策略控制方法进行具体阐述。
需要说明的是，本申请下述实施例中各个网元之间的消息名字或消息中各参数的名字等只是一个示例，具体实现中也可以是其他的名字，本申请实施例对此不作具体限定。
首先，以图1所示的策略控制系统或者图2a所示的策略控制系统应用于如图3a所示的非漫游5G网络架构，第一会话管理网元为SMF2网元，第二会话管理网元为SMF1网元为例，如图5所示，为本申请实施例提供的一种策略控制方法，该策略控制方法包括如下步骤：
S501、终端向AMF网元发送PDU会话建立请求(PDU session establishment request)1，以使得AMF网元接收来自终端的PDU会话建立请求1。
其中，PDU会话建立请求1中包括PDU会话标识2，用于请求建立第二会话。
可选的，本申请实施例中的PDU会话建立请求1中还可以包括S-NSSAI或DNN中的至少一个，本申请实施例对此不作具体限定。
可选的，本申请实施例中，AMF网元可以根据终端的签约数据、运营商策略或来自终端的PDU会话建立请求1中的至少一个，确定第二会话对应的S-NSSAI和DNN。
示例性的，若PDU会话建立请求1中包括S-NSSAI和DNN，则AMF网元可以根据该PDU会话建立请求1，确定第二会话对应的S-NSSAI和DNN。
或者，示例性的，若PDU会话建立请求1中包括S-NSSAI，则AMF网元可以从终端的签约数据或者运营商策略中获取第二会话对应的DNN；或者，示例性的，若PDU会话建立请求1中包括DNN，则AMF网元可以从终端的签约数据或者运营商策略中获取第二会话对应的S-NSSAI。也就是说，AMF网元可以根据该PDU会话建立请求1，结合终端的签约数据或者运营商策略，确定第二会话对应的S-NSSAI和DNN。
或者，示例性的，若PDU会话建立请求1中不包括S-NSSAI和DNN，则AMF网元可以从终端的签约数据或者运营商策略中的至少一个中获取第二会话对应的DNN和S-NSSAI，也就是说，AMF网元可以根据终端的签约数据或者运营商策略中的至少一个，确定第二会话对应的S-NSSAI和DNN。
本申请实施例不限定AMF网元确定第二会话对应的S-NSSAI和DNN的方式。
S502、AMF网元为第二会话选择SMF1网元。
可选的，AMF网元还可以为第二会话选择PCF网元，本申请实施例对此不作具体限定。
其中，AMF网元为第二会话选择SMF1网元和PCF网元的方式可参考现有技术，在此不再赘述。
S503、AMF网元向SMF1网元发送用于创建第二会话的创建请求消息1，以使得SMF1网元接收来自AMF网元的创建请求消息1。
其中，创建请求消息1包括终端的标识、S-NSSAI、DNN和PDU会话标识2。
可选的，若AMF网元还可以为第二会话选择PCF网元，则创建请求消息1中还可 以包括AMF网元为第二会话选择的PCF网元的标识，表示为PCF Ida，本申请实施例对此不作具体限定。
示例性的，本申请实施例中，终端的标识例如可以为用户永久标识(subscription permanent identifier，SUPI)，在此统一说明，本申请实施例对此不作具体限定。
可选的，本申请实施例中的创建请求消息1例如可以是PDU会话创建会话管理(session management，SM)上下文请求(PDU session create SM context request)消息1，本申请实施例对此不作具体限定。
S504、SMF1网元为第二会话在UDM网元中进行注册，以及SMF1网元从UDM网元中获取与终端的标识,DNN和S-NSSAI组合对应的会话管理签约数据(session management subscription data)。
此外，可选的，本申请实施例中，SMF1网元还可以向UDM网元订阅签约数据改变的通知，本申请实施例对此不作具体限定。
其中，步骤S504的相关实现可参考现有技术，在此不再赘述。
S505、SMF1网元为第二会话选择PCF网元之后，向PCF网元发送策略控制创建请求1，以使得PCF网元接收来自SMF1网元的策略控制创建请求1。
其中，策略控制创建请求1中可以包括终端的标识、PDU会话标识2、DNN、S-NSSAI以及SMF1网元为第二会话分配的互联网协议(Internet Protocol，IP)地址2。
可选的，本申请实施例中，SMF1网元可以根据本地策略，AMF网元发送的PCF网元的标识(这里为PCF Ida)、或者与网络存储功能(network repository function，NRF)网元交互等方式为第二会话选择PCF网元，具体可参考现有的实现方式，在此不再赘述。
S506、PCF网元向UDR网元发送查询请求(query request)1，以使得UDR网元接收来自PCF网元的查询请求1。
其中，查询请求1中包括终端的标识，S-NSSAI和DNN，用于查询会话策略相关的签约信息，如PDU会话策略控制数据(PDU session policy control data)，剩余的允许最大数据量(remaining allowed usage data)。PDU会话策略控制数据中例如可以包括签约的保证比特速率(guaranteed bit rate，GBR)，该签约的GBR表示允许PCF网元授权给终端的最大保证带宽。剩余的允许最大数据量表示允许PCF网元授权给终端的剩余用量。
可选的，本申请实施例中，PCF网元还可以向UDR网元订阅数据改变的通知，UDR网元接收订阅请求后，向PCF网元返回确认消息，本申请实施例对此不作具体限定。其中，这里的数据改变是指会话策略相关的签约信息改变，在此统一说明，以下不再赘述。
S507、UDR网元向PCF网元发送查询响应(query response)1，以使得PCF网元接收来自UDR网元的查询响应1。
其中，该查询响应1包括会话策略相关的签约信息。
S508、PCF网元根据获取的会话策略相关的签约信息进行策略决策，制定PCC规则和其他PDU会话相关的策略之后，向SMF1网元发送策略控制创建响应(policy control created response)1，以使得SMF1网元接收来自PCF网元的策略控制创建 响应1。
其中，该策略控制创建响应中包括PCF网元制定的会话策略。
S509、PCF网元与BSF网元之间进行管理注册。
具体的，PCF网元可以向BSF网元发送管理注册请求(management register request)，该管理注册请求中包括终端的标识、DNN、S-NSSAI、SMF1网元为第二会话选择的PCF网元的标识以及SMF1网元为第二会话分配的IP地址2。进而，在BSF网元保存终端的标识、DNN、S-NSSAI、PCF网元的标识以及IP地址2的对应关系之后，向PCF网元发送管理注册响应(management register response)。
S510、SMF1网元根据接收的会话策略，制定相关的用户面执行的策略(如PDR和关联的QER、URR、FAR等)。同时，SMF1网元为第二会话选择UPF1网元，并且与UPF1网元交互，建立N4会话，并向UPF1网元发送制定的用户面执行的策略，相关实现可参考现有技术，在此不再赘述。
S511、SMF1网元向AMF网元发送创建响应消息1，以使得AMF网元接收来自SMF1网元的创建响应消息1。
其中，该创建响应消息1包括SMF1网元为第二会话分配的IP地址2以及其他信息，具体可参考现有技术，在此不再赘述。
可选的，本申请实施例中的创建响应消息1例如可以是PDU会话创建SM上下文响应(PDU session create SM context response)消息1，本申请实施例对此不作具体限定。
S512、AMF网元与接入设备或终端等交互，完成第二会话的后续建立流程，相关实现可参考现有技术，在此不再赘述。
S513、终端确定需要建立与已建立的终端的第二会话具有相同的S-NSSAI和DNN的第一会话。
其中，本申请实施例中，终端可能是在接收到网络的触发或者自身的触发之后，确定需要建立与已建立的终端的第二会话具有相同的S-NSSAI和DNN的第一会话，本申请实施例对此不作具体限定。
S514、终端向AMF网元发送PDU会话建立请求2，以使得AMF网元接收来自终端的PDU会话建立请求2。
其中，PDU会话建立请求2中包括PDU会话标识1，用于请求建立第一会话。
可选的，本申请实施例中的PDU会话建立请求2中还可以包括S-NSSAI和DNN中的至少一个，本申请实施例对此不作具体限定。
其中，AMF网元确定第一会话对应的S-NSSAI和DNN的方式可参考步骤S501中AMF网元确定第一会话对应的S-NSSAI和DNN的方式，在此不再赘述。
S515、AMF网元为第一会话选择SMF2网元。
可选的，AMF网元还可以为第一会话选择PCF网元，本申请实施例对此不作具体限定。
其中，AMF网元为第一会话选择SMF1网元和PCF网元的方式可参考现有技术，在此不再赘述。
需要说明的是，本申请实施例中，AMF网元为终端的不同会话选择不同的SMF网 元的原因可以是考虑SMF网元负荷均衡，SMF网元需要关机等原因，本申请实施例对此不作具体限定。
S516、AMF网元向SMF2网元发送用于创建第一会话的创建请求消息2，以使得SMF2网元接收来自AMF网元的创建请求消息2。
其中，创建请求消息2包括终端的标识、S-NSSAI、DNN和PDU会话标识1。
可选的，若AMF网元还可以为第一会话选择PCF网元，则创建请求消息2中还可以包括AMF网元为第一会话选择的PCF网元的标识，表示为PCF Ida，本申请实施例对此不作具体限定。
可选的，本申请实施例中，若AMF网元确定正在建立的终端的第一会话与已建立的终端的第二会话具有相同的S-NSSAI和DNN，则该创建请求消息2中还可以包括指示信息，该指示信息用于指示SMF2网元从BSF网元获取PCF网元的标识；或者，该指示信息用于指示已建立与第一会话具有相同的S-NSSAI和DNN的终端的会话；或者，该指示信息用于指示第一会话存在对应的PCF绑定信息，该PCF绑定信息即终端的标识、S-NSSAI、DNN和PCF网元的标识的对应关系。这样，SMF2网元接收到该指示信息之后，可以向BSF网元请求与终端的标识、S-NSSAI和DNN对应的PCF网元的标识，本申请实施例对此不作具体限定。
可选的，本申请实施例中，AMF网元可以在确定终端在非漫游场景下建立第一会话之后，在向SMF2网元发送的创建请求消息2中携带上述指示信息，本申请实施例对此不作具体限定。示例性的，AMF网元确定终端在非漫游场景下建立第一会话例如可以是：AMF网元确定建立第一会话的终端位于家乡网络中，在此统一说明，以下不再赘述。
可选的，本申请实施例中，AMF网元确定正在建立的终端的第一会话与已建立的终端的第二会话具有相同的S-NSSAI和DNN，具体可以包括：AMF网元根据终端的签约数据、运营商策略和来自终端的PDU会话建立请求2中的至少一个，确定正在建立的终端的第一会话与已建立的终端的第二会话具有相同的S-NSSAI和DNN。
比如，AMF网元可以根据终端的签约数据、运营商策略或者来自终端的PDU会话建立请求2中的至少一个，确定第一会话对应的S-NSSAI和DNN；进而，AMF网元根据第一会话对应的S-NSSAI和DNN，以及第二会话对应的S-NSSAI和DNN，确定正在建立的终端的第一会话与已建立的终端的第二会话具有相同的S-NSSAI和DNN。
其中，AMF网元根据终端的签约数据、运营商策略或者来自终端的PDU会话建立请求2中的至少一个，确定第一会话对应的S-NSSAI和DNN的方式可参考上述实施例，在此不再赘述。
可选的，本申请实施例中的创建请求消息2例如可以是PDU会话创建会话管理SM上下文请求消息2，本申请实施例对此不作具体限定。
可选的，本申请实施例中，AMF网元确定正在建立的终端的第一会话与已建立的终端的第二会话具有相同的S-NSSAI和DNN，也可以替换为AMF网元确定第一会话存在对应的PCF绑定信息，该PCF绑定信息即终端的标识、S-NSSAI、DNN和PCF网元的标识的对应关系，本申请实施例对此不作具体限定。
S517、SMF2网元为第一会话在UDM网元中进行注册，以及SMF2网元从UDM网元 中获取与终端的标识,DNN和S-NSSAI组合对应的会话管理签约数据。
此外，可选的，本申请实施例中，SMF2网元还可以向UDM网元订阅签约数据改变的通知，本申请实施例对此不作具体限定。
可选的，本申请实施例中，若UDM网元确定正在建立的终端的第一会话与已建立的终端的第二会话具有相同的S-NSSAI和DNN，则UDM网元还向SMF2网元发送指示信息，该指示信息用于指示SMF2网元从BSF网元获取PCF网元的标识；或者，该指示信息用于指示已建立与第一会话具有相同的S-NSSAI和DNN的终端的会话；或者，该指示信息用于指示第一会话存在对应的PCF绑定信息，该PCF绑定信息即终端的标识、S-NSSAI、DNN和PCF网元的标识的对应关系。这样，SMF2网元接收到该指示信息之后，可以向BSF网元请求与终端的标识、S-NSSAI和DNN对应的PCF网元的标识。
可选的，本申请实施例中，若UDM网元确定正在建立的终端的第一会话与已建立的终端的第二会话具有相同的S-NSSAI和DNN，UDM网元可以在确定终端在非漫游场景下建立第一会话之后，再向SMF2网元发送上述指示信息，本申请实施例对此不作具体限定。示例性的，UDM网元确定终端在非漫游场景下建立第一会话例如可以是：UDM网元确定建立第一会话的终端位于家乡网络中，在此统一说明，以下不再赘述。
可选的，本申请实施例中，UDM网元确定正在建立的终端的第一会话与已建立的终端的第二会话具有相同的S-NSSAI和DNN，也可以替换为UDM网元第一会话存在对应的PCF绑定信息，该PCF绑定信息即终端的标识、S-NSSAI、DNN和PCF网元的标识的对应关系，本申请实施例对此不作具体限定。
其中，步骤S517的相关实现可参考现有技术，在此不再赘述。
S518、SMF2网元根据配置向BSF网元发送管理发现请求(management discovery request)，以使得BSF网元接收来自SMF2网元的管理发现请求。
其中，该管理发现请求包括终端的标识、S-NSSAI和DNN，用于请求与终端的标识、S-NSSAI和DNN对应的PCF网元的标识。
S519、BSF网元向SMF2网元发送管理发现响应(management discovery response)，以使得SMF2网元接收来自BSF网元的管理发现响应。
其中，该管理发现响应包括与终端的标识、S-NSSAI和DNN对应的PCF网元的标识。
可选的，本申请实施例中，BSF网元可以根据管理发现请求中携带的终端的标识、S-NSSAI和DNN，结合预先存储的终端的标识、S-NSSAI、DNN和PCF网元的对应关系，确定与终端的标识、S-NSSAI和DNN对应的PCF网元的标识，本申请实施例对此不作具体限定。
可选的，本申请实施例中，SMF2网元可以根据配置按照上述方式总是和BSF网元交互，尝试获取与终端的标识、S-NSSAI和DNN对应的PCF网元的标识。若不存在具有相同DNN和S-NSSAI的终端的会话，则BSF网元不返回任何PCF网元的标识，此时SMF2网元可以采用其他方式选择PCF网元，比如根据本地配置，AMF网元提供的PCF网元的标识或者NRF网元提供的PCF网元的标识选择PCF网元，本申请实施例对此不作具体限定。
可选的，本申请实施例中，若步骤S516中的创建请求消息2中包括上述指示信息 或者若在步骤S517中UDM网元向SMF2发送了上述指示信息，则SMF2网元可以根据上述指示信息向BSF网元发送管理发现请求，从而获取对应的PCF网元的标识，本申请实施例对此不作具体限定。
S520、SMF2网元根据PCF网元的标识，向对应的PCF网元发送策略控制创建请求2，以使得PCF网元接收来自SMF2网元的策略控制创建请求2。
其中，策略控制创建请求2中可以包括终端的标识、PDU会话标识1、DNN、S-NSSAI以及SMF2网元为第一会话分配的IP地址1。
S521、PCF网元向SMF2网元发送策略控制创建响应2，以使得SMF2网元接收来自PCF网元的策略控制创建响应2。
其中，该策略控制创建响应中包括PCF网元制定的会话策略。
S522、SMF2网元根据接收的会话策略，制定相关的用户面执行的策略(如PDR和关联的QER、URR、FAR等)。同时，SMF2网元为第一会话选择UPF2网元，并且与UPF2网元交互，建立N4会话，并向UPF2网元发送制定的用户面执行的策略，相关实现可参考现有技术，在此不再赘述。
S523、SMF2网元向AMF网元发送创建响应消息2，以使得AMF网元接收来自SMF2网元的创建响应消息2。
其中，该创建响应消息2包括SMF2网元为第一会话分配的IP地址1以及其他信息，具体可参考现有技术，在此不再赘述。
可选的，本申请实施例中的创建响应消息2例如可以是PDU会话创建SM上下文响应消息2，本申请实施例对此不作具体限定。
S524、AMF网元与接入设备或终端等交互，完成第一会话的后续建立流程，相关实现可参考现有技术，在此不再赘述。
基于本申请实施例提供的策略控制方法，可以保证为同一个终端的具有相同S-NSSAI和DNN的多个会话选择相同的PCF网元，因此可以避免为同一个终端的具有相同S-NSSAI和DNN的多个PDU会话制定的策略与从UDR网元获取的签约信息相冲突的问题。相关技术效果分析可参考上述策略控制系统部分，在此不再赘述。
其中，上述步骤S501至S524中的AMF网元或者SMF2网元的动作可以由图4所示的通信设备400中的处理器401调用存储器403中存储的应用程序代码来执行，本实施例对此不作任何限制。
可选的，以图1所示的策略控制系统应用于如图3b所示的家乡路由5G网络架构，第一会话管理网元为H-SMF2网元，第二会话管理网元为H-SMF1网元为例，本申请实施例还可以提供一种类似于图5所示的实施例的策略控制方法，区别比如在于：将图5所示的实施例中的SMF1网元替换为本申请实施例中的H-SMF1网元，将图5所示的SMF2网元替换为本申请实施例中的H-SMF2网元，将图5所示的实施例中的UPF1网元替换为本申请实施例中的H-UPF1网元，将图5所示的实施例中的UPF2网元替换为本申请实施例中的H-UPF2网元。相应的，AMF网元需要在选择H-SMF1网元时，选择一个拜访地的V-SMF1网元。AMF网元与H-SMF1网元交互的信息需要通过V-SMF1网元转发；AMF网元需要在选择H-SMF2网元时，选择一个拜访地的V-SMF2网元(V-SMF1网元和V-SMF2网元可以相同或不同，本申请实施例对此不作具体限定)，AMF网元与 H-SMF2网元交互的信息需要通过V-SMF2网元转发。比如，AMF网元通过V-SMF1网元向H-SMF1网元发送用于创建第二会话的创建请求消息1，以使得H-SMF1网元接收来自AMF网元的创建请求消息1；AMF网元通过V-SMF2网元向H-SMF2网元发送用于创建第一会话的创建请求消息2，以使得H-SMF2网元接收来自AMF网元的创建请求消息2。此外，H-SMF1网元和H-SMF2网元与UDM网元交互，分别为第二会话和第一会话进行注册。可选的，AMF网元可以在确定终端在家乡路由场景下建立第一会话之后，在通过V-SMF2网元向H-SMF2网元发送的创建请求消息2中携带指示信息，该指示信息用于指示H-SMF2网元从BSF网元获取PCF网元的标识；或者，该指示信息用于指示已建立与第一会话具有相同的S-NSSAI和DNN的终端的会话；或者，该指示信息用于指示第一会话存在对应的绑定信息。示例性的，AMF网元确定终端在家乡路由场景下建立第一会话例如可以是：根据终端的签约数据、运营商策略和来自终端的PDU会话建立请求2中的至少一个确定终端在家乡路由场景下建立第一会话。其余相关描述可参考图5所示的实施例，在此不再赘述。可选的，UDM网元可以在确定终端在家乡路由场景下建立第一会话之后，在向H-SMF2网元发送的注册请求的应答消息中携带指示信息，该指示信息用于指示H-SMF2网元从BSF网元获取PCF网元的标识；或者，该指示信息用于指示已建立与第一会话具有相同的S-NSSAI和DNN的终端的会话；或者，该指示信息用于指示第一会话存在对应的绑定信息。示例性的，UDM网元确定终端在家乡路由场景下建立第一会话例如可以是：UDM网元确定请求注册的H-SMF2网元为位于家乡网络的SMF网元。其余相关描述可参考图5所示的实施例，在此不再赘述。
可选的，以图2所示的策略控制系统应用于如图3a所示的5G网络，第一会话管理网元为SMF2网元，第二会话管理网元为SMF1网元，网络设备为AMF网元为例，如图6所示，为本申请实施例提供的一种策略控制方法，该策略控制方法包括如下步骤：
S601-S608、同图5所示的实施例中的步骤S501-S508，相关描述可参考图5所示的实施例，在此不再赘述。
S609、同图5所示的实施例中的步骤S510，相关描述可参考图5所示的实施例，在此不再赘述。
S610、与图5所示的实施例中的步骤S511类似，区别比如在于，本申请实施例中，需要在创建响应消息1中携带SMF1网元为第二会话选择的PCF网元的标识。这样，AMF网元接收创建响应消息1之后，可以保存终端的标识、S-NSSAI、DNN和该PCF网元的标识的对应关系。其余相关描述可参考图5所示的实施例，在此不再赘述。
S611-S614、同图5所示的实施例中的步骤S512-S515，相关描述可参考图5所示的实施例，在此不再赘述。
S615、可选的，AMF网元确定终端在非漫游场景下建立第一会话。相关描述可参考图5所示的实施例中的步骤S516，在此不再赘述。
S616、若AMF网元确定正在建立的终端的第一会话与已建立的终端的第二会话具有相同的S-NSSAI和DNN，AMF网元向SMF2网元发送用于创建第一会话的创建请求消息2，以使得SMF2网元接收来自AMF网元的创建请求消息2。
其中，该创建请求消息2包括终端的标识、S-NSSAI、DNN、SMF1网元为第二会话选择的PCF网元的标识和PDU会话标识1。
其中，AMF网元确定正在建立的终端的第一会话与已建立的终端的第二会话具有相同的S-NSSAI和DNN的方式可参考图5所示的实施例，在此不再赘述。
可选的，本申请实施例中，AMF网元可以根据获取的终端的标识、S-NSSAI和DNN，结合预先存储的终端的标识、S-NSSAI、DNN和PCF网元的对应关系，确定与终端的标识、S-NSSAI和DNN对应的PCF网元的标识，即SMF1网元为第二会话选择的PCF网元的标识，本申请实施例对此不作具体限定。
可选的，若AMF网元还可以为第一会话选择PCF网元，则创建请求消息2中还可以包括AMF网元为第一会话选择的PCF网元的标识，表示为PCF Ida，本申请实施例对此不作具体限定。
其中，为了区别SMF1网元为第二会话选择的PCF网元的标识不是现有技术中AMF选择的PCF网元的标识，一种可能的实现方式中，在消息中的特殊的字段中携带SMF1网元为第二会话选择的PCF网元的标识来指示该PCF网元的标识为SMF网元选择的PCF网元，本申请实施例对此不作具体限定。其中，该特殊的字段可以是消息中现有的字段，也可以是新增的字段，这里不做限定。
或者，为了区别SMF1网元为第二会话选择的PCF网元的标识不是现有技术中AMF选择的PCF网元的标识，一种可能的实现方式中，可以在创建请求消息2中携带指示信息，该指示信息用于指示该PCF网元的标识对应的PCF网元是SMF1网元选择的PCF网元；或者，该指示信息用于指示SMF2网元选择该PCF网元的标识对应的PCF网元，本申请实施例对此不作具体限定。
S617、同图5所示的实施例中的步骤S517，相关描述可参考图5所示的实施例，在此不再赘述。
S618-S622、同图5所示的实施例中的步骤S520-S524，相关描述可参考图5所示的实施例，在此不再赘述。
基于本申请实施例提供的策略控制方法，可以保证为同一个终端的具有相同S-NSSAI和DNN的多个会话选择相同的PCF网元，因此可以避免为同一个终端的具有相同S-NSSAI和DNN的多个PDU会话制定的策略与从UDR网元获取的签约信息相冲突的问题。相关技术效果分析可参考上述策略控制系统部分，在此不再赘述。
其中，上述步骤S601至S622中的AMF网元或者SMF2网元的动作可以由图4所示的通信设备400中的处理器401调用存储器403中存储的应用程序代码来执行，本实施例对此不作任何限制。
可选的，以图2所示的策略控制系统应用于如图3b所示的家乡路由5G网络架构，第一会话管理网元为H-SMF2网元，第二会话管理网元为H-SMF1网元，网络设备为AMF网元为例，本申请实施例还可以提供一种类似于图6所示的实施例的策略控制方法，区别比如在于：将图6所示的实施例中的SMF1网元替换为本申请实施例中的H-SMF1网元，将图6所示的SMF2网元替换为本申请实施例中的H-SMF2网元，将图6所示的实施例中的UPF1网元替换为本申请实施例中的H-UPF1网元，将图6所示的实施例中的UPF2网元替换为本申请实施例中的H-UPF2网元。相应的，AMF网元需要在选择H-SMF1网元时，选择一个拜访地的V-SMF1网元。AMF网元与H-SMF1网元交互的信息需要通过V-SMF1网元转发；AMF网元需要在选择H-SMF2网元时，选择一个拜访地的 V-SMF2网元(V-SMF1网元和V-SMF2网元可以相同或不同，本申请实施例对此不作具体限定)，AMF网元与H-SMF2网元交互的信息需要通过V-SMF2网元转发。比如，AMF网元通过V-SMF1网元向H-SMF1网元发送用于创建第二会话的创建请求消息1，以使得H-SMF1网元接收来自AMF网元的创建请求消息1；AMF网元通过V-SMF2网元向H-SMF2网元发送用于创建第一会话的创建请求消息2，以使得H-SMF2网元接收来自AMF网元的创建请求消息2。可选的，AMF网元可以在确定终端在家乡路由场景下建立第一会话之后，执行步骤S616类似的步骤。示例性的，AMF网元确定终端在家乡路由场景下请求建立第一会话例如可以是：根据终端的签约数据、运营商策略和来自终端的PDU会话建立请求2中的至少一个确定终端在家乡路由场景下建立第一会话。其余相关描述可参考图6所示的实施例，在此不再赘述。
可选的，以图2所示的策略控制系统应用于如图3a所示的5G网络，第一会话管理网元为SMF2网元，第二会话管理网元为SMF1网元，网络设备为UDM网元为例，如图7所示，为本申请实施例提供的一种策略控制方法，该策略控制方法包括如下步骤：
S701-S703、同图5所示的实施例中的步骤S501-S503，相关描述可参考图5所示的实施例，在此不再赘述。
可选的，本申请实施例中，AMF网元可以在步骤S703中包括指示信息，该指示信息用于指示SMF1网元优先执行PCF网元的选择，本申请实施例对此不作具体限定。
S704、与图5所示的实施例中的步骤S504类似，区别比如在于，本申请实施例中，SMF1根据配置选择PCF网元，并且在SMF1网元向UDM网元注册时，需要携带SMF1网元为第二会话选择的PCF网元的标识。这样，UDM网元可以保存终端的标识、S-NSSAI、DNN和该PCF网元的标识的对应关系。其余相关描述可参考图5所示的实施例，在此不再赘述。
可选的，本申请实施例中，若步骤S703中包括上述指示信息，则SMF1网元可以根据该指示信息，优先执行PCF网元的选择之后，再执行步骤S704，本申请实施例对此不作具体限定。
可选的，本申请实施例中，若SMF1网元不优先选择PCF网元，则SMF1网元向UDM网元注册的请求消息中不携带PCF网元的标识，而是SMF网元在执行PCF网元的选择后，再向UDM网元发送携带SMF1网元为第二会话选择的PCF网元的标识，本申请实施例对此不作具体限定。
S705-S708、同图5所示的实施例中的步骤S505-S508，相关描述可参考图5所示的实施例，在此不再赘述。
S709-S714、同图5所示的实施例中的步骤S510-S515，相关描述可参考图5所示的实施例，在此不再赘述。
S715、AMF网元向SMF2网元发送用于创建第一会话的创建请求消息2，以使得SMF2网元接收来自AMF网元的创建请求消息2。
其中，该创建请求消息2包括终端的标识、S-NSSAI、DNN和PDU会话标识1。
可选的，若AMF网元还可以为第一会话选择PCF网元，则创建请求消息2中还可以包括AMF网元为第一会话选择的PCF网元的标识，表示为PCF Ida，本申请实施例对此不作具体限定。
S716、与图5所示的实施例中的步骤S517类似，区别比如在于，本申请实施例中，在SMF2网元向UDM网元注册时，若UDM网元确定正在建立的终端的第一会话与已建立的终端的第二会话具有相同的S-NSSAI和DNN，则UDM网元可以根据注册请求中携带的终端的标识、S-NSSAI和DNN，结合预先存储的终端的标识、S-NSSAI、DNN和PCF网元的对应关系，确定与终端的标识、S-NSSAI和DNN对应的PCF网元的标识，进而向SMF2网元发送该PCF网元的标识，本申请实施例对此不作具体限定。
可选的，本申请实施例中，UDM网元可以根据SMF2网元向UDM网元注册时发送的注册请求中携带的终端的标识、S-NSSAI和DNN，确定正在建立的终端的第一会话与已建立的终端的第二会话具有相同的S-NSSAI和DNN，本申请实施例对此不作具体限定。
可选的，本申请实施例中，UDM网元可以在确定终端在非漫游场景下建立第一会话之后，再向SMF2网元发送与终端的标识、S-NSSAI和DNN对应的PCF网元的标识，本申请实施例对此不作具体限定。示例性的，UDM网元确定终端在非漫游场景下建立第一会话例如可以是：UDM网元确定请求注册的SMF2网元为位于家乡网络的SMF网元，在此统一说明，以下不再赘述。
可选的，本申请实施例中，UDM网元确定正在建立的终端的第一会话与已建立的终端的第二会话具有相同的S-NSSAI和DNN，也可以替换为UDM网元确定第一会话存在对应的PCF绑定信息，该PCF绑定信息即终端的标识、S-NSSAI、DNN和PCF网元的标识的对应关系，本申请实施例对此不作具体限定。
S717-S721、同图5所示的实施例中的步骤S520-S524，相关描述可参考图5所示的实施例，在此不再赘述。
基于本申请实施例提供的策略控制方法，可以保证为同一个终端的具有相同S-NSSAI和DNN的多个会话选择相同的PCF网元，因此可以避免为同一个终端的具有相同S-NSSAI和DNN的多个PDU会话制定的策略与从UDR网元获取的签约信息相冲突的问题。相关技术效果分析可参考上述策略控制系统部分，在此不再赘述。
其中，上述步骤S701至S721中的UDM网元或者SMF2网元的动作可以由图4所示的通信设备400中的处理器401调用存储器403中存储的应用程序代码来执行，本实施例对此不作任何限制。
可选的，以图2所示的策略控制系统应用于如图3b所示的家乡路由5G网络架构，第一会话管理网元为H-SMF2网元，第二会话管理网元为H-SMF1网元，网络设备为UDM网元为例，本申请实施例还可以提供一种类似于图7所示的实施例的策略控制方法，区别比如在于：将图7所示的实施例中的SMF1网元替换为本申请实施例中的H-SMF1网元，将图7所示的SMF2网元替换为本申请实施例中的H-SMF2网元，将图7所示的实施例中的UPF1网元替换为本申请实施例中的H-UPF1网元，将图7所示的实施例中的UPF2网元替换为本申请实施例中的H-UPF2网元。相应的，AMF网元需要在选择H-SMF1网元时，选择一个拜访地的V-SMF1网元。AMF网元与H-SMF1网元交互的信息需要通过V-SMF1网元转发；AMF网元需要在选择H-SMF2网元时，选择一个拜访地的V-SMF2网元(V-SMF1网元和V-SMF2网元可以相同或不同，本申请实施例对此不作具体限定)，AMF网元与H-SMF2网元交互的信息需要通过V-SMF2网元转发。比如，AMF网元通过V-SMF1网元向H-SMF1网元发送用于创建第二会话的创建请求消息1，以使 得H-SMF1网元接收来自AMF网元的创建请求消息1；AMF网元通过V-SMF2网元向H-SMF2网元发送用于创建第一会话的创建请求消息2，以使得H-SMF2网元接收来自AMF网元的创建请求消息2。可选的，UDM网元可以在确定终端在家乡路由场景下建立第一会话之后，再向H-SMF2网元发送与终端的标识、S-NSSAI和DNN对应的PCF网元的标识，本申请实施例对此不作具体限定。示例性的，UDM网元确定终端在家乡路由场景下建立第一会话例如可以是：UDM网元确定请求注册的H-SMF2网元为位于家乡网络的SMF网元。其余相关描述可参考图7所示的实施例，在此不再赘述。
需要说明的是，图7中，以图2所示的策略控制系统应用于如图3a所示的5G网络与如图3b所示的家乡路由5G网络架构的区别说明同样适用于下述图12至图14中，在此统一说明，以下不再赘述。
可选的，以图2所示的策略控制系统应用于如图3a所示的5G网络，第一会话管理网元为SMF2网元，第二会话管理网元为SMF1网元，网络设备为UDM网元为例，如图12所示，为本申请实施例提供的一种策略控制方法，该策略控制方法包括如下步骤：
S1201-S1203、同图5所示的实施例中的步骤S501-S503，相关描述可参考图5所示的实施例，在此不再赘述。
S1204、SMF1网元为第二会话在UDM网元中进行注册，以及SMF1网元从UDM网元中获取与终端的标识，DNN和S-NSSAI组合对应的会话管理签约数据。
可选的，本申请实施例中，若UDM网元中没有对应的会话管理签约数据，则UDM网元进一步向UDR网元查询，UDR网元向UDM网元返回与终端的标识,DNN和S-NSSAI组合对应的会话管理签约数据，从而UDM网元进一步向SMF1网元返回与终端的标识,DNN和S-NSSAI组合对应的会话管理签约数据。
可选的，本申请实施例中，SMF1网元还可以向UDM网元订阅签约数据改变的通知。可选的，UDM网元可以进一步向UDR网元订阅签约数据改变的通知。
可选的，本申请实施例中，SMF1网元还可以向UDM网元订阅PCF绑定信息改变的通知。可选的，UDM网元可以进一步向UDR网元订阅PCF绑定信息改变的通知。其中，该PCF绑定信息即终端的标识，DNN，S-NSSAI和对应的PCF网元的标识的对应关系。
S1205、同图5所示的实施例中的步骤S505，相关描述可参考图5所示的实施例，在此不再赘述。
S1206、PCF网元向UDR网元发送查询请求1，以使得UDR网元接收来自PCF网元的查询请求1。
其中，该查询请求1中携带终端的标识，S-NSSAI和DNN，用于查询会话策略相关的签约信息。其中，会话策略相关的签约信息的相关描述可参考图5所示的实施例中的步骤S506，在此不再赘述。
此外，该查询请求1中携带SMF1网元为第二会话选择的PCF网元的标识。
可选的，本申请实施例中，PCF网元还可以向UDR网元订阅数据改变的通知，UDR网元接收订阅请求后，返回确认消息。
S1207、UDR网元向PCF网元发送查询响应1，以使得PCF网元接收来自UDR网元的查询响应1。
其中，该查询响应1携带与终端的标识,DNN和S-NSSAI组合对应的会话策略相关 的签约信息。
此外，本申请实施例中，UDR网元获取SMF1网元为第二会话选择的PCF网元的标识之后，保存终端的标识，DNN，S-NSSAI和该PCF网元的标识的对应关系，即保存PCF绑定信息。
S1208、同图5所示的实施例中的步骤S508，相关描述可参考图5所示的实施例，在此不再赘述。
S1209-S1214、同图5所示的实施例中的步骤S510-515，相关描述可参考图5所示的实施例，在此不再赘述。
S1215、AMF网元向SMF2网元发送用于创建第一会话的创建请求消息2，以使得SMF2网元接收来自AMF网元的创建请求消息2。
其中，创建请求消息2包括终端的标识、S-NSSAI、DNN和PDU会话标识1。
可选的，若AMF网元还可以为第一会话选择PCF网元，则创建请求消息2中还可以包括AMF网元为第一会话选择的PCF网元的标识，表示为PCF Ida，本申请实施例对此不作具体限定。
S1216、SMF2网元为第一会话在UDM网元中进行注册，以及SMF2网元从UDM网元中获取与终端的标识，DNN和S-NSSAI组合对应的会话管理签约数据。
此外，本申请实施例中，若UDM网元判断第一会话是非漫游场景下建立的，则UDM网元还可以向SMF2网元返回PCF绑定信息，该PCF绑定信息即上述终端的标识，DNN，S-NSSAI和SMF1网元选择的PCF网元的标识的对应关系。
一种可能的实现方式中，UDM网元可以通过如下方式获取PCF绑定信息：若UDM网元判断已经有其他SMF网元(即SMF1网元)为具有该终端标识、DNN和S-NSSAI的PDU会话进行了注册，则UDM网元向UDR网元发送查询请求2，该查询请求2中包括终端的标识、DNN和S-NSSAI，以请求获取该PCF绑定信息。进而，UDR网元向UDM网元发送该PCF绑定信息，UDM网元接收该PCF绑定信息。
或者，另一种可能的实现方式中，UDM网元可以通过如下方式获取PCF绑定信息：若步骤S1204中订阅了PCF绑定信息改变通知，则当在步骤S1207中，UDR网元保存了终端的标识，DNN，S-NSSAI和PCF网元的标识的对应关系之后，UDR网元向UDM网元发送PCF绑定信息改变通知，该PCF绑定信息改变通知中携带该PCF绑定信息。进而，UDM网元接收该PCF绑定信息。
S1217-S1221、同图5所示的实施例中的步骤S520-S524，相关描述可参考图5所示的实施例，在此不再赘述。
基于本申请实施例提供的策略控制方法，可以保证为同一个终端的具有相同S-NSSAI和DNN的多个会话选择相同的PCF网元，因此可以避免为同一个终端的具有相同S-NSSAI和DNN的多个PDU会话制定的策略与从UDR网元获取的签约信息相冲突的问题。相关技术效果分析可参考上述策略控制系统部分，在此不再赘述。
其中，上述步骤S1201至S1221中的UDM网元或者SMF2网元的动作可以由图4所示的通信设备400中的处理器401调用存储器403中存储的应用程序代码来执行，本实施例对此不作任何限制。
可选的，以图2所示的策略控制系统应用于如图3a所示的5G网络，第一会话管 理网元为SMF2网元，第二会话管理网元为SMF1网元，网络设备为UDM网元为例，如图13所示，为本申请实施例提供的一种策略控制方法，该策略控制方法包括如下步骤：
S1301-S1303、同图5所示的实施例中的步骤S501-S503，相关描述可参考图5所示的实施例，在此不再赘述。
S1304-S1305、同图8所示的实施例中的步骤S804-S805，相关描述可参考图5所示的实施例，在此不再赘述。
S1306-S1309、同图5所示的实施例中的步骤S506-S509，相关描述可参考图5所示的实施例，在此不再赘述。
S1310、BSF网元向UDR网元发送数据更新请求消息，以使得UDR网元接收来自BSF网元的数据更新请求消息。
其中，该数据更新请求消息包括PCF绑定信息，其中，该PCF绑定信息即终端的标识，DNN，S-NSSAI和PCF网元的标识的对应关系。UDR网元获取PCF绑定信息之后，保存该PCF绑定信息。
S1311-S1316、同图5所示的实施例中的步骤S510-515，相关描述可参考图5所示的实施例，在此不再赘述。
S1317、AMF网元向SMF2网元发送用于创建第一会话的创建请求消息2，以使得SMF2网元接收来自AMF网元的创建请求消息2。
其中，创建请求消息2包括终端的标识、S-NSSAI、DNN和PDU会话标识1。
可选的，若AMF网元还可以为第一会话选择PCF网元，则创建请求消息2中还可以包括AMF网元为第一会话选择的PCF网元的标识，表示为PCF Ida，本申请实施例对此不作具体限定。
S1318、与图12所示的实施例中的步骤S1216类似，区别比如在于，本申请实施例中，在步骤S1310中，UDR网元该PCF绑定信息。其余相关描述可参考图12所示的实施例，在此不再赘述。
S1319-S1323、同图5所示的实施例中的步骤S520-S524，相关描述可参考图5所示的实施例，在此不再赘述。
基于本申请实施例提供的策略控制方法，可以保证为同一个终端的具有相同S-NSSAI和DNN的多个会话选择相同的PCF网元，因此可以避免为同一个终端的具有相同S-NSSAI和DNN的多个PDU会话制定的策略与从UDR网元获取的签约信息相冲突的问题。相关技术效果分析可参考上述策略控制系统部分，在此不再赘述。
其中，上述步骤S1301至S1323中的UDM网元或者SMF2网元的动作可以由图4所示的通信设备400中的处理器401调用存储器403中存储的应用程序代码来执行，本实施例对此不作任何限制。
可选的，以图2b所示的策略控制系统应用于如图3a所示的5G网络，第一会话管理网元为SMF2网元，第二会话管理网元为SMF1网元，网络设备为UDM网元为例，如图14所示，为本申请实施例提供的一种策略控制方法，该策略控制方法包括如下步骤：
S1401-S1417、同图5所示的实施例中的步骤S501-S517，相关描述可参考图5所示的实施例，在此不再赘述。
S1418、SMF2网元为第一会话选择PCFx网元之后，向PCFx网元发送策略控制创 建请求2，以使得PCFx网元接收来自SMF2网元的策略控制创建请求2。
其中，策略控制创建请求2中可以包括终端的标识、PDU会话标识2、DNN、S-NSSAI以及SMF2网元为第一会话分配的IP地址1。
可选的，本申请实施例中，SMF2网元可以根据本地策略，AMF网元发送的PCF网元的标识(这里为PCF Ida)、或者与NRF网元交互等方式为第一会话选择PCFx网元，具体可参考现有的实现方式，在此不再赘述。
S1419、PCFx网元与BSF网元之间进行管理注册。
具体的，PCFx网元可以向BSF网元发送管理注册请求,该管理注册请求中包括终端的标识、DNN、S-NSSAI、SMF2网元为第一会话选择的PCFx网元的标识以及SMF2网元为第一会话分配的IP地址1。进而，BSF网元在接收该管理注册请求之后，确定已经存在与终端的标识、DNN和S-NSSAI对应的PCF网元(即SMF1网元位第二会话选择的PCF网元)的标识，则BSF网元向PCFx返回拒绝指示，并在拒绝指示中携带与终端的标识、DNN和S-NSSAI对应的PCF网元的标识。
S1420、PCFx网元向SMF2网元发送上述拒绝指示，以使得SMF2网元接收来自PCFx网元的拒绝指示。
S1421、SMF2向PCF网元的标识对应的PCF网元发送策略控制创建请求3，以使得该PCF网元接收来自SMF1网元的策略控制创建请求3。
S1422、PCF网元与BSF网元之间进行管理注册。
具体的，PCF网元可以向BSF网元发送管理注册请求，该管理注册请求中包括终端的标识、DNN、S-NSSAI、SMF1网元为第二会话选择的PCF网元的标识以及SMF2网元为第一会话分配的IP地址1。进而，在BSF网元保存终端的标识、DNN、S-NSSAI、PCF网元的标识以及IP地址1的对应关系之后，向PCF网元发送管理注册响应。
S1423-S1426、同图5所示的实施例中的步骤S521-524，相关描述可参考图5所示的实施例，在此不再赘述。
基于本申请实施例提供的策略控制方法，可以保证为同一个终端的具有相同S-NSSAI和DNN的多个会话选择相同的PCF网元，因此可以避免为同一个终端的具有相同S-NSSAI和DNN的多个PDU会话制定的策略与从UDR网元获取的签约信息相冲突的问题。相关技术效果分析可参考上述策略控制系统部分，在此不再赘述。
或者，可选的，以图2b所示的策略控制系统应用于如图3a所示的5G网络，第一会话管理网元为SMF2网元，第二会话管理网元为SMF1网元，网络设备为UDM网元为例，如图14所示，为本申请实施例提供的一种策略控制方法，该策略控制方法包括如下步骤：
S1401-S1408、同图5所示的实施例中的步骤S501-S508，相关描述可参考图5所示的实施例，在此不再赘述。
S1409、PCF网元与BSF网元之间进行管理注册。
具体的，PCF网元可以向BSF网元发送管理注册请求(management register request)，该管理注册请求中包括终端的标识、DNN、S-NSSAI、SMF1网元为第二会话选择的PCF网元的标识以及SMF1网元为第二会话分配的IP地址2。进而，在BSF网元保存终端的标识、DNN、S-NSSAI、PCF网元的标识以及IP地址2的对应关系之后， 向PCF网元发送管理注册响应(management register response)。其中，本申请实施例中，PCF网元可以为PCF网络功能实例(network function instance)或PCF网络功能服务实例(network function service instance)。相应地，PCF网元的标识可以为PCF网元的网络功能实例标识(network fuction instance Id)或PCF网元的网络功能服务实例标识(network fuction service Iinstance Id)，在此不作具体限定。
可选地，本申请实施例中，若网络支持PCF网元组，SMF1网元也可以在管理注册请求中包括终端的标识、DNN、S-NSSAI、SMF1网元为第二会话选择的PCF网元的标识(可选)、SMF1网元为第二会话选择的PCF网元所属的PCF网元组标识1以及SMF1网元为第二会话分配的IP地址2。进而，在BSF网元保存终端的标识、DNN、S-NSSAI、PCF网元的标识(可选)、PCF网元组标识1以及IP地址2的对应关系之后，向PCF网元发送管理注册响应。其中，一个PCF网元组中通常包括多个PCF网元，这多个PCF网元共享一个非结构化数据存储功能(unstructured data storage function，UDSF)网元。UDSF网元可以确保分配给不同PCF网元的签约数据不冲突。其中，本申请实施例中，PCF网元组为PCF网元的网络功能组(network fuction set)或PCF网元的网络功能服务组(network fuction service set)。相应地，PCF网元组标识为PCF网元的网络功能组标识(network fuction set Id)或PCF网元的网络功能服务组标识(network fuction service set Id)，在此不作具体限定。
可选地，本申请实施例中，在PCF网元向BSF网元发送管理注册请求前，PCF网元还可以根据运营商策略、配置和/或用户签约(譬如用户签约中指示用量监控要应用于该用户，用户签约在步骤1407中获得)确定要为终端的标识、DNN、S-NSSAI组合选择相同的PCF网元。PCF网元在向BSF网元发送的管理注册请求消息中还携带选择同一个PCF网元的指示。然而，由于BSF网元还没有终端的标识、DNN、S-NSSAI组合对应的绑定关系，因此BSF网元向PCF网元返回成功的响应。
可选地，本申请实施例中，当PCF网元判断该终端在非漫游或家乡路由场景下建立第二会话时，在管理注册请求消息中携带选择同一个PCF网元的指示。
可选地，在本实施例中，若网络中支持PCF网元组，则PCF网元还可以根据运营商策略、配置和/或用户签约(譬如用户签约中指示用量监控要应用于该用户，用户签约在步骤1407中获得)确定要为终端的标识、DNN、S-NSSAI组合选择相同的PCF网元组。PCF网元在向BSF网元发送的管理注册请求消息中还携带选择同一个PCF网元组的指示。然而，由于BSF网元还没有终端的标识、DNN、S-NSSAI组合对应的绑定关系，因此BSF网元向PCF网元返回成功的响应。
可选地，本申请实施例中，当PCF网元判断该终端在非漫游或家乡路由场景下建立第二会话时，在管理注册请求消息中携带选择同一个PCF网元组的指示。
S1410-S1417、同图5所示的实施例中的步骤S510-S517，相关描述可参考图5所示的实施例，在此不再赘述。
可选的，本申请实施例中，步骤S1414中的AMF网元和步骤1401中的AMF网元可以相同，也可以不相同，本申请实施例仅是示例性的以AMF网元相同为例进行说明，在此统一说明，以下不再赘述。
S1418、SMF2网元为第一会话选择PCFx网元之后，向PCFx网元发送策略控制创建请求2，以使得PCFx网元接收来自SMF2网元的策略控制创建请求2。
其中，策略控制创建请求2中可以包括终端的标识、PDU会话标识2、DNN、S-NSSAI以及SMF2网元为第一会话分配的IP地址1。
可选的，本申请实施例中，SMF2网元可以根据本地策略，AMF网元发送的PCF网元的标识(这里为PCF Ida)、或者与NRF网元交互等方式为第一会话选择PCFx网元，具体可参考现有的实现方式，在此不再赘述。
S1419、PCFx网元与BSF网元之间进行管理注册。
具体的，PCFx网元可以向BSF网元发送管理注册请求,该管理注册请求中包括终端的标识、DNN、S-NSSAI、SMF2网元为第一会话选择的PCFx网元的标识以及SMF2网元为第一会话分配的IP地址1。进而，BSF网元在接收该管理注册请求之后，确定已经存在与终端的标识、DNN和S-NSSAI对应的PCF网元(即SMF1网元为第二会话选择的PCF网元)的标识，则BSF网元向PCFx网元返回拒绝指示，并在拒绝指示中携带与终端的标识、DNN和S-NSSAI对应的PCF网元的标识。
可选地，在本实施例中，若网络支持PCF网元组，SMF2网元也还可以在管理注册请求中包括终端的标识、DNN、S-NSSAI、SMF2网元为第一会话选择的PCFx网元的标识(可选)、SMF2网元为第一会话选择的PCFx网元所属的PCF网元组标识2以及SMF2网元为第一会话分配的IP地址1。进而，BSF网元在接收该管理注册请求之后，确定已经存在与终端的标识、DNN和S-NSSAI对应的PCF网元组标识(即SMF1网元为第二会话选择的PCF网元组标识1)，则BSF网元向PCFx网元返回拒绝指示，并在拒绝指示中携带与终端的标识、DNN和S-NSSAI对应的PCF网元组标识1。
可选地，本申请实施例中，在PCFx网元向BSF网元发送管理注册请求前，PCFx网元还可以根据运营商策略、配置和/或用户签约(譬如用户签约中指示用量监控要应用于该用户，用户签约为PCFx与UDR交互获得)确定要为终端的标识、DNN、S-NSSAI组合选择相同的PCF网元。那么，PCFx网元在向BSF网元发送的管理注册请求消息中还携带选择同一个PCF网元的指示。BSF网元根据收到的选择同一个PCF网元的指示，且BSF网元已经有了终端的标识、DNN、S-NSSAI组合对应的绑定关系(在步骤1409中注册的绑定关系)，因此BSF网元向PCFx网元返回拒绝指示，并在拒绝指示中携带与终端的标识、DNN和S-NSSAI对应的PCF网元的标识。
可选地，本申请实施例中，当PCFx网元判断该终端在非漫游或家乡路由场景下建立第一会话时，在管理注册请求消息中携带选择同一个PCF网元的指示。
可选地，本申请实施例中，若网络支持PCF网元组，在PCFx网元向BSF网元发送管理注册请求前，PCFx网元还可以根据运营商策略、配置和/或用户签约(譬如用户签约中指示用量监控要应用于该用户，用户签约为PCFx与UDR交互获得)确定要为终端的标识、DNN、S-NSSAI组合选择相同的PCF网元组。那么，PCFx网元在向BSF网元发送的管理注册请求消息中还携带选择同一个PCF网元组的指示。BSF网元根据收到的选择同一个PCF网元组的指示，且BSF网元已经有了终端的标识、DNN、S-NSSAI组合对应的绑定关系(在步骤1409中注册的绑定关系)，因此BSF网元向PCFx网元返回拒绝指示，并在拒绝指示中携带与终端的标识、DNN和S-NSSAI对应的PCF网元 组标识1。
可选地，本申请实施例中，当PCFx网元判断该终端在非漫游或家乡路由场景下建立第一会话时，在管理注册请求消息中携带选择同一个PCF网元组的指示。
可选的，本申请实施例中，拒绝指示可以通过携带PCF网元的标识表示；或通过携带一个拒绝的超文本传输协议(hyperText transfer protocol，HTTP)状态码和PCF网元的标识来表示，在此统一说明，以下不再赘述。
可选的，本申请实施例中，若网络支持PCF网元组，拒绝指示可以通过携带PCF网元组标识表示；或通过携带一个拒绝的超文本传输协议(hyperText transfer protocol，HTTP)状态码和PCF网元组标识来表示，在此统一说明，以下不再赘述。
S1420、PCFx网元向SMF2网元发送上述拒绝指示，以使得SMF2网元接收来自PCFx网元的拒绝指示。
S1421、SMF2网元向PCF网元的标识对应的PCF网元发送策略控制创建请求3，以使得该PCF网元接收来自SMF2网元的策略控制创建请求3。
可选的，本申请实施例中，若网络支持PCF网元组，SMF2网元选择PCF网元组标识1中的一个PCF网元后向该PCF网元发送策略控制创建请求3，以使得该PCF网元接收来自SMF2网元的策略控制创建请求3。
可选地，SMF2网元与PCFx网元交互，终结步骤S1418建立的策略关联。
S1422、PCF网元与BSF网元之间进行管理注册。
具体的，PCF网元可以向BSF网元发送管理注册请求，该管理注册请求中包括终端的标识、DNN、S-NSSAI、SMF1网元为第二会话选择的PCF网元的标识以及SMF2网元为第一会话分配的IP地址1。进而，在BSF网元保存终端的标识、DNN、S-NSSAI、PCF网元的标识以及IP地址1的对应关系之后，向PCF网元发送管理注册响应。
可选地，若网络支持PCF网元组，PCF网元可以向BSF网元发送管理注册请求，该管理注册请求中包括终端的标识、DNN、S-NSSAI、SMF2网元为第一会话选择的PCF网元的标识(可选)、PCF网元所属的组标识以及SMF2网元为第一会话分配的IP地址1。进而，在BSF网元保存终端的标识、DNN、S-NSSAI、PCF网元的标识(可选)、PCF网元组标识以及IP地址1的对应关系之后，向PCF网元发送管理注册响应。
S1423-S1426、同图5所示的实施例中的步骤S521-524，相关描述可参考图5所示的实施例，在此不再赘述。
基于本申请实施例提供的策略控制方法，可以保证为同一个终端的具有相同S-NSSAI和DNN的多个会话选择相同的PCF网元或相同的PCF网元组，因此可以避免为同一个终端的具有相同S-NSSAI和DNN的多个PDU会话制定的策略与从UDR网元获取的签约信息相冲突的问题。相关技术效果分析可参考上述策略控制系统部分，在此不再赘述。
其中，上述步骤S1401至S1426中的BSF网元或者SMF2网元的动作可以由图4所示的通信设备400中的处理器401调用存储器403中存储的应用程序代码来执行，本实施例对此不作任何限制。
上述主要从各个网元之间交互的角度对本申请实施例提供的方案进行了介绍。可以理解的是，上述移动管理网元、网络设备、第一会话管理网元或者第二会话管理网 元、或者第一策略控制网元或者绑定支持网元为了实现上述功能，其包含了执行各个功能相应的硬件结构和/或软件模块。本领域技术人员应该很容易意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，本申请能够以硬件或硬件和计算机软件的结合形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
本申请实施例可以根据上述方法示例对移动管理网元、网络设备、第一会话管理网元或者第二会话管理网元、或者第一策略控制网元或者绑定支持网元进行功能模块的划分，例如，可以对应各个功能划分各个功能模块，也可以将两个或两个以上的功能集成在一个处理模块中。上述集成的模块既可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。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。
比如，以采用集成的方式划分各个功能模块的情况下，图8示出了一种移动管理网元80的结构示意图。该移动管理网元80包括：处理模块801和收发模块802。处理模块801，用于确定正在建立的终端的第一会话与已建立的终端的第二会话具有相同的S-NSSAI和DNN。收发模块802，用于向第一会话管理网元发送用于创建第一会话的第一请求消息，第一请求消息包括终端的标识、S-NSSAI、DNN和指示信息，指示信息用于指示第一会话管理网元从绑定支持网元获取策略控制网元的标识；或者，指示信息用于指示已建立与第一会话具有相同的S-NSSAI和DNN的终端的会话；或者，该指示信息用于指示第一会话存在对应的绑定信息。
可选的，处理模块801具体用于：根据终端的签约数据、运营商策略和来自终端的会话建立请求中的至少一个，确定正在建立的终端的第一会话与已建立的终端的第二会话具有相同的S-NSSAI和DNN。
可选的，处理模块801，还用于确定终端在非漫游或家乡路由场景下建立第一会话。
其中，上述方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能描述，在此不再赘述。
在本实施例中，该移动管理网元80以采用集成的方式划分各个功能模块的形式来呈现。这里的“模块”可以指特定ASIC，电路，执行一个或多个软件或固件程序的处理器和存储器，集成逻辑电路，和/或其他可以提供上述功能的器件。在一个简单的实施例中，本领域的技术人员可以想到该移动管理网元80可以采用图4所示的形式。
比如，图4中的处理器401可以通过调用存储器403中存储的计算机执行指令，使得移动管理网元80执行上述方法实施例中的策略控制方法。
具体的，图8中的收发模块802和处理模块801的功能/实现过程可以通过图4中的处理器401调用存储器403中存储的计算机执行指令来实现。或者，图8中的处理模块801的功能/实现过程可以通过图4中的处理器401调用存储器403中存储的计算机执行指令来实现，图8中的收发模块802的功能/实现过程可以通过图4中的通信接口404来实现。
由于本实施例提供的移动管理网元80可执行上述的策略控制方法，因此其所能获 得的技术效果可参考上述方法实施例，在此不再赘述。
可选的，本申请实施例还提供了一种装置(例如，该装置可以是芯片系统)，该装置包括处理器，用于支持移动管理网元实现上述策略控制方法，例如确定正在建立的终端的第一会话与已建立的终端的第二会话具有相同的S-NSSAI和DNN。在一种可能的设计中，该装置还包括存储器。该存储器，用于保存移动管理网元必要的程序指令和数据。当然，存储器也可以不在该装置中。该装置是芯片系统时，可以由芯片构成，也可以包含芯片和其他分立器件，本申请实施例对此不作具体限定。
或者，比如，以采用集成的方式划分各个功能模块的情况下，图9示出了一种网络设备90的结构示意图。该网络设备90包括：处理模块901和收发模块902。处理模块901，用于确定正在建立的终端的第一会话与已建立的终端的第二会话具有相同的S-NSSAI和名称DNN。收发模块902，用于向第一会话对应的第一会话管理网元发送第二会话对应的第二会话管理网元选择的策略控制网元的标识，策略控制网元的标识用于第一会话管理网元选择策略控制网元。
可选的，收发模块902，还用于在建立第二会话的过程中，接收来自第二会话管理网元的策略控制网元的标识。
可选的，该网络设备90可以为统一数据管理网元。收发模块902，还用于在建立第二会话的过程中，向统一数据库网元发送绑定信息改变通知的订阅请求。收发模块902，还用于接收来自统一数据库网元的绑定信息改变通知，该绑定信息改变通知包括与终端的标识、S-NSSAI和DNN对应的策略控制网元的标识。
可选的，如图9所示，该网络设备90还包括：存储模块903。存储模块903，用于存储终端的标识、S-NSSAI、DNN和策略控制网元的标识的对应关系。
可选的，处理模块901，还用于根据终端的标识、S-NSSAI、DNN和对应关系，确定策略控制网元的标识。
可选的，该网络设备90可以为统一数据管理网元。收发模块902，还用于向统一数据库网元发送请求消息，该请求消息包括终端的标识、S-NSSAI和DNN；收发模块902，还用于接收来自统一数据库网元的与终端的标识、S-NSSAI和DNN对应的策略控制网元的标识。
可选的，处理模块901，还用于确定终端在非漫游或家乡路由场景下建立第一会话。
可选的，网络设备90为移动管理网元；处理模块901，用于确定正在建立的终端的第一会话与已建立的终端的第二会话具有相同的S-NSSAI和DNN，具体为：用于根据终端的签约数据、运营商策略和来自终端的会话建立请求中的至少一个，确定正在建立的终端的第一会话与已建立的终端的第二会话具有相同的S-NSSAI和DNN。
可选的，网络设备90为移动管理网元；收发模块902，还用于向第一会话管理网元发送指示信息，指示信息用于指示策略控制网元的标识对应的策略控制网元是会话管理网元选择的策略控制网元；或者，指示信息用于指示第一会话管理网元选择策略控制网元的标识对应的策略控制网元；或者，该指示信息用于指示第一会话存在对应的绑定信息。
可选的，网络设备90为移动管理网元；收发模块902，还用于在特殊字段中携带 策略控制网元的标识，特殊字段用于指示策略控制网元的标识对应的策略控制网元是会话管理网元选择的策略控制网元。
可选的，网络设备90为统一数据管理网元；收发模块902，还用于接收来自第一会话管理网元的注册请求，注册请求包括终端的标识、S-NSSAI和DNN；相应的，处理模块901，用于确定正在建立的终端的第一会话与已建立的终端的第二会话具有相同的S-NSSAI和DNN，具体为：用于根据终端的标识、S-NSSAI和DNN，确定正在建立的终端的第一会话与已建立的终端的第二会话具有相同的S-NSSAI和DNN。
其中，上述方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能描述，在此不再赘述。
在本实施例中，该网络设备90以采用集成的方式划分各个功能模块的形式来呈现。这里的“模块”可以指特定ASIC，电路，执行一个或多个软件或固件程序的处理器和存储器，集成逻辑电路，和/或其他可以提供上述功能的器件。在一个简单的实施例中，本领域的技术人员可以想到该网络设备90可以采用图4所示的形式。
比如，图4中的处理器401可以通过调用存储器403中存储的计算机执行指令，使得网络设备90执行上述方法实施例中的策略控制方法。
具体的，图9中的收发模块902、处理模块901和存储模块903的功能/实现过程可以通过图4中的处理器401调用存储器403中存储的计算机执行指令来实现。或者，图9中的处理模块901的功能/实现过程可以通过图4中的处理器401调用存储器403中存储的计算机执行指令来实现，图9中的收发模块902的功能/实现过程可以通过图4中的通信接口404来实现，图9中的存储模块903的功能/实现过程可以通过图4中的存储器403来实现。
由于本实施例提供的网络设备90可执行上述的策略控制方法，因此其所能获得的技术效果可参考上述方法实施例，在此不再赘述。
可选的，本申请实施例还提供了一种装置(例如，该装置可以是芯片系统)，该装置包括处理器，用于支持网络设备实现上述策略控制方法，例如确定正在建立的终端的第一会话与已建立的终端的第二会话具有相同的S-NSSAI和DNN。在一种可能的设计中，该装置还包括存储器。该存储器，用于保存网络设备必要的程序指令和数据。当然，存储器也可以不在该装置中。该装置是芯片系统时，可以由芯片构成，也可以包含芯片和其他分立器件，本申请实施例对此不作具体限定。
或者，比如，以采用集成的方式划分各个功能模块的情况下，图10示出了一种第一会话管理网元100的结构示意图。该第一会话管理网元100包括：处理模块1001和收发模块1002。
一种可能的实现方式中：
收发模块1002，用于接收来自移动管理网元的用于创建第一会话的第一请求消息，第一请求消息包括终端的标识、S-NSSAI和DNN。收发模块1002，还用于向绑定支持网元发送第二请求消息，第二请求消息包括终端的标识、S-NSSAI和DNN，用于请求对应的策略控制网元的标识，策略控制网元为第二会话对应的策略控制网元，第二会话为已建立的与第一会话具有相同S-NSSAI和DNN的终端的会话。收发模块1002，还用于接收来自绑定支持网元的策略控制网元的标识。处理模块1001，用于根据策略控制 网元的标识选择策略控制网元。
可选的，第一请求消息还包括指示信息，指示信息用于指示第一会话管理网元从绑定支持网元获取策略控制网元的标识；或者，指示信息用于指示已建立与第一会话具有相同的S-NSSAI和DNN的终端的会话；或者，该指示信息用于指示第一会话存在对应的绑定信息。
可选的，收发模块1002，还用于向统一数据管理网元发送注册请求，该注册请求包括终端的标识、正在建立的该终端的第一会话对应的S-NSSAI和DNN；收发模块1002，还用于接收来自统一数据管理网元的指示信息，该指示信息用于指示第一会话管理网元从绑定支持网元获取策略控制网元的标识；或者，该指示信息用于指示已建立与第一会话具有相同的S-NSSAI和DNN的所述终端的会话；或者，该指示信息用于指示第一会话存在对应的绑定信息。收发模块1002，用于向绑定支持网元发送第二请求消息，包括：用于根据该指示信息，向绑定支持网元发送第二请求消息。
另一种可能的实现方式中：
收发模块1002，用于接收来自移动管理网元的用于创建第一会话的第一请求消息，第一请求消息包括终端的标识、S-NSSAI和DNN。收发模块，还用于向绑定支持网元发送第二请求消息，第二请求消息包括终端的标识、S-NSSAI和DNN，用于请求对应的策略控制网元的标识，策略控制网元为第二会话对应的策略控制网元，第二会话为已建立的与第一会话具有相同S-NSSAI和DNN的终端的会话。处理模块1001，用于若确定接收不到来自绑定支持网元的策略控制网元的标识，根据本地配置、移动管理网元提供的策略控制网元的标识或者网络存储功能网元提供的策略控制网元的标识中的至少一个为第一会话选择策略控制网元。
其中，上述方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能描述，在此不再赘述。
在本实施例中，该第一会话管理网元100以采用集成的方式划分各个功能模块的形式来呈现。这里的“模块”可以指特定ASIC，电路，执行一个或多个软件或固件程序的处理器和存储器，集成逻辑电路，和/或其他可以提供上述功能的器件。在一个简单的实施例中，本领域的技术人员可以想到该第一会话管理网元100可以采用图4所示的形式。
比如，图4中的处理器401可以通过调用存储器403中存储的计算机执行指令，使得第一会话管理网元100执行上述方法实施例中的策略控制方法。
具体的，图10中的收发模块1002和处理模块1001的功能/实现过程可以通过图4中的处理器401调用存储器403中存储的计算机执行指令来实现。或者，图10中的处理模块1001的功能/实现过程可以通过图4中的处理器401调用存储器403中存储的计算机执行指令来实现，图10中的收发模块1002的功能/实现过程可以通过图4中的通信接口404来实现。
由于本实施例提供的第一会话管理网元100可执行上述的策略控制方法，因此其所能获得的技术效果可参考上述方法实施例，在此不再赘述。
可选的，本申请实施例还提供了一种装置(例如，该装置可以是芯片系统)，该装置包括处理器，用于支持第一会话管理网元实现上述策略控制方法，例如确根据策 略控制网元的标识选择策略控制网元。在一种可能的设计中，该装置还包括存储器。该存储器，用于保存第一会话管理网元必要的程序指令和数据。当然，存储器也可以不在该装置中。该装置是芯片系统时，可以由芯片构成，也可以包含芯片和其他分立器件，本申请实施例对此不作具体限定。
或者，比如，以采用集成的方式划分各个功能模块的情况下，图11示出了一种第二会话管理网元110的结构示意图。该第二会话管理网元110包括：处理模块1101和收发模块1102。
处理模块1101，用于在建立终端的第二会话的过程中，选择策略控制网元。收发模块1102，用于向网络设备发送策略控制网元的标识，策略控制网元的标识用于第一会话管理网元选择策略控制网元，第一会话管理网元为第一会话对应的会话管理网元，第一会话为待建立的与第二会话具有相同的S-NSSAI和DNN的终端的会话。
可选的，网络设备为移动管理网元或者统一数据管理网元。
可选的，第二会话为第二会话管理网元为终端处理的第一个具有S-NSSAI和DNN的会话。
可选的，收发模块1102，还用于接收来自移动管理网元的指示信息，该指示信息用于指示优先执行策略控制网元的选择。比如，第二会话管理网元在选择策略控制网元之后，再向统一数据管理网元发送包括策略控制网元的标识的注册请求。
其中，上述方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能描述，在此不再赘述。
在本实施例中，该第二会话管理网元110以采用集成的方式划分各个功能模块的形式来呈现。这里的“模块”可以指特定ASIC，电路，执行一个或多个软件或固件程序的处理器和存储器，集成逻辑电路，和/或其他可以提供上述功能的器件。在一个简单的实施例中，本领域的技术人员可以想到该第二会话管理网元110可以采用图4所示的形式。
比如，图4中的处理器401可以通过调用存储器403中存储的计算机执行指令，使得第二会话管理网元110执行上述方法实施例中的策略控制方法。
具体的，图11中的收发模块1102和处理模块1101的功能/实现过程可以通过图4中的处理器401调用存储器403中存储的计算机执行指令来实现。或者，图11中的处理模块1101的功能/实现过程可以通过图4中的处理器401调用存储器403中存储的计算机执行指令来实现，图11中的收发模块1102的功能/实现过程可以通过图4中的通信接口404来实现。
由于本实施例提供的第二会话管理网元110可执行上述的策略控制方法，因此其所能获得的技术效果可参考上述方法实施例，在此不再赘述。
可选的，本申请实施例还提供了一种装置(例如，该装置可以是芯片系统)，该装置包括处理器，用于支持第二会话管理网元实现上述策略控制方法，例如在建立终端的第二会话的过程中，选择策略控制网元。在一种可能的设计中，该装置还包括存储器。该存储器，用于保存第二会话管理网元必要的程序指令和数据。当然，存储器也可以不在该装置中。该装置是芯片系统时，可以由芯片构成，也可以包含芯片和其他分立器件，本申请实施例对此不作具体限定。
或者，比如，以采用集成的方式划分各个功能模块的情况下，图15示出了一种统一数据管理网元150的结构示意图。该统一数据管理网元150包括：接收模块1501和发送模块1502。其中，接收模块1501，用于接收来自第一会话管理网元的注册请求，该注册请求包括终端的标识、正在建立的该终端的第一会话对应的S-NSSAI和DNN。发送模块1502，用于向第一会话管理网元发送指示信息，该指示信息用于指示该第一会话管理网元从绑定支持网元获取策略控制网元的标识；或者，该指示信息用于指示已建立与该第一会话具有相同的S-NSSAI和DNN的该终端的会话；或者，该指示信息用于指示该第一会话存在对应的绑定信息。
可选的，如图15所示，该统一数据管理网元150还可以包括处理模块1503。其中，处理模块1503，用于确定正在建立的终端的第一会话与已建立的该终端的第二会话具有相同的S-NSSAI和DNN。
可选的，处理模块1501，还用于确定该终端在非漫游或家乡路由场景下建立该第一会话。
其中，上述方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能描述，在此不再赘述。
在本实施例中，该统一数据管理网元150以采用集成的方式划分各个功能模块的形式来呈现。这里的“模块”可以指特定ASIC，电路，执行一个或多个软件或固件程序的处理器和存储器，集成逻辑电路，和/或其他可以提供上述功能的器件。在一个简单的实施例中，本领域的技术人员可以想到该统一数据管理网元150可以采用图4所示的形式。
比如，图4中的处理器401可以通过调用存储器403中存储的计算机执行指令，使得统一数据管理网元150执行上述方法实施例中的策略控制方法。
具体的，图15中的接收模块1501、发送模块1502和处理模块1503的功能/实现过程可以通过图4中的处理器401调用存储器403中存储的计算机执行指令来实现。或者，图15中的处理模块1503的功能/实现过程可以通过图4中的处理器401调用存储器403中存储的计算机执行指令来实现，图15中的接收模块1501和发送模块1502的功能/实现过程可以通过图4中的通信接口404来实现。
由于本实施例提供的统一数据管理网元150可执行上述的策略控制方法，因此其所能获得的技术效果可参考上述方法实施例，在此不再赘述。
可选的，本申请实施例还提供了一种装置(例如，该装置可以是芯片系统)，该装置包括处理器，用于支持统一数据管理网元实现上述策略控制方法，例如确定正在建立的终端的第一会话与已建立的该终端的第二会话具有相同的S-NSSAI和DNN。在一种可能的设计中，该装置还包括存储器。该存储器，用于保存统一数据管理网元必要的程序指令和数据。当然，存储器也可以不在该装置中。该装置是芯片系统时，可以由芯片构成，也可以包含芯片和其他分立器件，本申请实施例对此不作具体限定。
或者，比如，以采用集成的方式划分各个功能模块的情况下，图16示出了一种第一策略控制网元160的结构示意图。该第一策略控制网元160包括：接收模块1601和发送模块1602。
一种可能的实现方式中，接收模块1601，用于接收来自第一会话管理管理网元的 策略控制创建请求，该策略控制创建请求包括终端的标识、S-NSSAI和DNN；发送模块1602，用于向绑定支持网元发送终端的标识、S-NSSAI、DNN和第一策略控制网元160的标识；接收模块1601，还用于接收来自绑定支持网元的第二策略控制网元的标识，发送模块1602，还用于向第一会话管理网元发送第二策略控制网元的标识，第二策略控制网元的标识为绑定支持网元保存的与终端的标识、S-NSSAI和DNN对应的策略控制网元的标识。
可选的，如图16所示，该第一策略控制网元160还包括：处理模块1603。其中，处理模块1603，用于确定需要为终端的标识、S-NSSAI和DNN的组合选择相同的策略控制网元；发送模块1602，还用于向绑定支持网元发送指示信息，该指示信息用于指示为终端的标识、S-NSSAI和DNN的组合选择相同的策略控制网元。
另一种可能的实现方式中，接收模块1601，用于接收来自第一会话管理网元的策略控制创建请求，策略控制创建请求包括终端的标识、S-NSSAI和DNN；发送模块1602，用于向绑定支持网元发送终端的标识、S-NSSAI、DNN和第一策略控制网元所属的第一策略控制网元组标识；接收模块1601，还用于接收来自绑定支持网元的第二策略控制网元组标识；发送模块1602，还用于向第一会话管理网元发送第二策略控制网元组标识，第二策略控制网元组标识为绑定支持网元保存的与终端的标识、S-NSSAI和DNN对应的策略控制网元组标识。
可选的，如图16所示，第一策略控制网元160还包括：处理模块1603。处理模块1603，用于确定需要为终端的标识、S-NSSAI和DNN的组合选择相同的策略控制网元组；发送模块1602，用于向绑定支持网元发送指示信息，指示信息用于指示为终端的标识、S-NSSAI和DNN的组合选择相同的策略控制网元组。
其中，上述方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能描述，在此不再赘述。
在本实施例中，该第一策略控制网元160以采用集成的方式划分各个功能模块的形式来呈现。这里的“模块”可以指特定ASIC，电路，执行一个或多个软件或固件程序的处理器和存储器，集成逻辑电路，和/或其他可以提供上述功能的器件。在一个简单的实施例中，本领域的技术人员可以想到该第一策略控制网元160可以采用图4所示的形式。
比如，图4中的处理器401可以通过调用存储器403中存储的计算机执行指令，使得第一策略控制网元160执行上述方法实施例中的策略控制方法。
具体的，图16中的接收模块1601、发送模块1602和处理模块1603的功能/实现过程可以通过图4中的处理器401调用存储器403中存储的计算机执行指令来实现。或者，图16中的处理模块1603的功能/实现过程可以通过图4中的处理器401调用存储器403中存储的计算机执行指令来实现，图16中的接收模块1601和发送模块1602的功能/实现过程可以通过图4中的通信接口404来实现。
由于本实施例提供的第一策略控制网元160可执行上述的策略控制方法，因此其所能获得的技术效果可参考上述方法实施例，在此不再赘述。
可选的，本申请实施例还提供了一种装置(例如，该装置可以是芯片系统)，该装置包括处理器，用于支持第一策略控制网元实现上述策略控制方法，例如确定需要 为终端的标识、S-NSSAI和DNN的组合选择相同的策略控制网元。在一种可能的设计中，该装置还包括存储器。该存储器，用于保存第一策略控制网元必要的程序指令和数据。当然，存储器也可以不在该装置中。该装置是芯片系统时，可以由芯片构成，也可以包含芯片和其他分立器件，本申请实施例对此不作具体限定。
或者，比如，以采用集成的方式划分各个功能模块的情况下，图17示出了一种绑定支持网元170的结构示意图。该绑定支持网元170包括：处理模块1701和收发模块1702。
一种可能的实现方式中，收发模块1702，用于接收来自第一策略控制网元的终端的标识、S-NSSAI、DNN和第一策略控制网元的标识；处理模块1701，用于确定已经存在与终端的标识、S-NSSAI和DNN的组合对应的第二策略控制网元的标识；收发模块1702，还用于向第一策略控制网元发送第二策略控制网元的标识。
可选的，如图17所示，绑定支持网元170还包括：存储模块1703。收发模块1702，还用于在第二会话建立过程中，接收来自第二策略控制网元的终端的标识、S-NSSAI、DNN和第二策略控制网元的标识；存储模块1703，用于存储终端的标识、S-NSSAI、DNN和第二策略控制网元的标识的对应关系。
可选的，收发模块1702，还用于接收来自第一策略控制网元的指示信息，指示信息用于指示为终端的标识、S-NSSAI和DNN的组合选择相同的策略控制网元；处理模块1701，还用于根据指示信息确定向第一策略控制网元发送第二策略控制网元的标识。
另一种可能的实现方式中，收发模块1702，用于接收来自第一策略控制网元的终端的标识、S-NSSAI、DNN和第一策略控制网元所属的第一策略控制网元组标识；处理模块1701，用于确定已经存在与终端的标识、S-NSSAI和DNN的组合对应的第二策略控制网元组标识；收发模块1702，还用于向第一策略控制网元发送第二策略控制网元组标识。
可选的，如图17所示，绑定支持网元170还包括：存储模块1703。收发模块1702，还用于在第二会话建立过程中，接收来自第二策略控制网元的终端的标识、S-NSSAI、DNN和第二策略控制网元所属的第二策略控制网元组标识；存储模块1703，用于存储终端的标识、S-NSSAI、DNN和第二策略控制网元组标识的对应关系。
可选的，收发模块1702，还用于接收来自第一策略控制网元的指示信息，指示信息用于指示为终端的标识、S-NSSAI和DNN的组合选择相同的策略控制网元组；处理模块1701，还用于根据指示信息确定向第一策略控制网元发送第二策略控制网元组标识。
其中，上述方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能描述，在此不再赘述。
在本实施例中，该绑定支持网元170以采用集成的方式划分各个功能模块的形式来呈现。这里的“模块”可以指特定ASIC，电路，执行一个或多个软件或固件程序的处理器和存储器，集成逻辑电路，和/或其他可以提供上述功能的器件。在一个简单的实施例中，本领域的技术人员可以想到该绑定支持网元170可以采用图4所示的形式。
比如，图4中的处理器401可以通过调用存储器403中存储的计算机执行指令，使得绑定支持网元170执行上述方法实施例中的策略控制方法。
具体的，图17中的收发模块1702、处理模块1701和存储模块1703的功能/实现过程可以通过图4中的处理器401调用存储器403中存储的计算机执行指令来实现。或者，图17中的处理模块1701的功能/实现过程可以通过图4中的处理器401调用存储器403中存储的计算机执行指令来实现，图17中的收发模块1702的功能/实现过程可以通过图4中的通信接口404来实现，图17中的存储模块1703的功能/实现过程可以通过图4中的存储器403来实现。
由于本实施例提供的绑定支持网元170可执行上述的策略控制方法，因此其所能获得的技术效果可参考上述方法实施例，在此不再赘述。
可选的，本申请实施例还提供了一种装置(例如，该装置可以是芯片系统)，该装置包括处理器，用于支持绑定支持网元实现上述策略控制方法，例如确定已经存在与终端的标识、S-NSSAI和DNN的组合对应的第二策略控制网元的标识。在一种可能的设计中，该装置还包括存储器。该存储器，用于保存绑定支持网元必要的程序指令和数据。当然，存储器也可以不在该装置中。该装置是芯片系统时，可以由芯片构成，也可以包含芯片和其他分立器件，本申请实施例对此不作具体限定。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件程序实现时，可以全部或部分地以计算机程序产品的形式来实现。该计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行计算机程序指令时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或者数据中心通过有线(例如同轴电缆、光纤、数字用户线(digital subscriber line，DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可以用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质(例如，软盘、硬盘、磁带)，光介质(例如，DVD)、或者半导体介质(例如固态硬盘(solid state disk，SSD))等。
尽管在此结合各实施例对本申请进行了描述，然而，在实施所要求保护的本申请过程中，本领域技术人员通过查看所述附图、公开内容、以及所附权利要求书，可理解并实现所述公开实施例的其他变化。在权利要求中，“包括”(comprising)一词不排除其他组成部分或步骤，“一”或“一个”不排除多个的情况。单个处理器或其他单元可以实现权利要求中列举的若干项功能。相互不同的从属权利要求中记载了某些措施，但这并不表示这些措施不能组合起来产生良好的效果。
尽管结合具体特征及其实施例对本申请进行了描述，显而易见的，在不脱离本申请的精神和范围的情况下，可对其进行各种修改和组合。相应地，本说明书和附图仅仅是所附权利要求所界定的本申请的示例性说明，且视为已覆盖本申请范围内的任意和所有修改、变化、组合或等同物。显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的精神和范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (79)

  1. 一种策略控制方法，其特征在于，所述方法包括：
    移动管理网元向第一会话管理网元发送用于创建第一会话的第一请求消息，所述第一请求消息包括终端的标识、单个网络切片选择辅助信息S-NSSAI和数据网络名称DNN；
    所述第一会话管理网元接收来自所述移动管理网元的所述第一请求消息，并向绑定支持网元发送第二请求消息，所述第二请求消息包括所述终端的标识、所述S-NSSAI和所述DNN；
    所述第一会话管理网元接收来自所述绑定支持网元的所述策略控制网元的标识，并根据所述策略控制网元的标识选择所述策略控制网元。
  2. 根据权利要求1所述的方法，其特征在于，在所述移动管理网元向所述第一会话管理网元发送所述第一请求消息之前，所述方法还包括：
    所述移动管理网元确定所述第一会话与已建立的所述终端的第二会话具有相同的S-NSSAI和DNN；
    相应的，所述第一请求消息还包括指示信息，所述指示信息用于指示所述第一会话管理网元从所述绑定支持网元获取策略控制网元的标识；或者，所述指示信息用于指示已建立与所述第一会话具有相同的S-NSSAI和DNN的所述终端的会话；或者，所述指示信息用于指示所述第一会话存在对应的绑定信息。
  3. 根据权利要求2所述的方法，其特征在于，在所述移动管理网元向所述第一会话管理网元发送所述第一请求消息之前，所述方法还包括：
    所述移动管理网元确定所述终端在非漫游或家乡路由场景下建立所述第一会话。
  4. 根据权利要求1-3任一项所述的方法，其特征在于，所述方法还包括：
    在建立第二会话的过程中，所述第二会话管理网元选择所述策略控制网元，并向所述绑定支持网元发送注册请求，所述注册请求包括所述终端的标识、所述S-NSSAI、所述DNN和所述策略控制网元的标识。
  5. 一种策略控制方法，其特征在于，所述方法包括：
    第一会话管理网元接收来自统一数据管理网元的指示信息，所述指示信息用于指示所述第一会话管理网元从绑定支持网元获取策略控制网元的标识；或者，所述指示信息用于指示已建立与正在建立的终端的第一会话具有相同的单个网络切片选择辅助信息S-NSSAI和数据网络名称DNN的所述终端的会话；或者，所述指示信息用于指示所述第一会话存在对应的绑定信息；
    所述第一会话管理网元根据所述指示信息向所述绑定支持网元发送请求消息，所述请求消息包括所述终端的标识、所述S-NSSAI和所述DNN；
    所述第一会话管理网元接收来自所述绑定支持网元的所述策略控制网元的标识，并根据所述策略控制网元的标识选择所述策略控制网元。
  6. 根据权利要求5所述的方法，其特征在于，在所述第一会话管理网元接收来自统一数据管理网元的指示信息之前，所述方法还包括：
    所述统一数据管理网元确定所述第一会话与已建立的所述终端的第二会话具有相同的S-NSSAI和DNN；
    所述统一数据管理网元向所述第一会话管理网元发送所述指示信息。
  7. 根据权利要求5或6所述的方法，其特征在于，在所述统一数据管理网元向所述第一会话管理网元发送所述指示信息之前，所述方法还包括：
    所述统一数据管理网元确定所述终端在非漫游或家乡路由场景下建立所述第一会话。
  8. 一种策略控制方法，其特征在于，所述方法包括：
    移动管理网元确定正在建立的终端的第一会话与已建立的所述终端的第二会话具有相同的单个网络切片选择辅助信息S-NSSAI和数据网络名称DNN；
    所述移动管理网元向第一会话管理网元发送用于创建所述第一会话的第一请求消息，所述第一请求消息包括所述终端的标识、所述S-NSSAI、所述DNN和指示信息，所述指示信息用于指示所述第一会话管理网元从绑定支持网元获取策略控制网元的标识；或者，所述指示信息用于指示已建立与所述第一会话具有相同的S-NSSAI和DNN的所述终端的会话；或者，所述指示信息用于指示所述第一会话存在对应的绑定信息。
  9. 根据权利要求8所述的方法，其特征在于，所述移动管理网元确定正在建立的终端的第一会话与已建立的所述终端的第二会话具有相同的S-NSSAI和DNN，具体为：
    所述移动管理网元根据所述终端的签约数据、运营商策略和来自所述终端的会话建立请求中的至少一个，确定正在建立的所述终端的第一会话与已建立的所述终端的第二会话具有相同的S-NSSAI和DNN。
  10. 根据权利要求8或9所述的方法，其特征在于，在所述移动管理网元向所述第一会话管理网元发送所述第一请求消息之前，所述方法还包括：
    所述移动管理网元确定所述终端在非漫游或家乡路由场景下建立所述第一会话。
  11. 一种策略控制方法，其特征在于，所述方法包括：
    网络设备确定正在建立的终端的第一会话与已建立的所述终端的第二会话具有相同的单个网络切片选择辅助信息S-NSSAI和数据网络名称DNN；
    所述网络设备向所述第一会话对应的第一会话管理网元发送所述第二会话对应的第二会话管理网元选择的策略控制网元的标识，所述策略控制网元的标识用于所述第一会话管理网元选择所述策略控制网元。
  12. 根据权利要求11所述的方法，其特征在于，所述方法还包括：
    在建立所述第二会话的过程中，所述网络设备接收来自所述第二会话管理网元的所述策略控制网元的标识。
  13. 根据权利要求11所述的方法，其特征在于，所述网络设备为统一数据管理网元；所述方法还包括：
    在建立所述第二会话的过程中，所述统一数据管理网元向统一数据库网元发送绑定信息改变通知的订阅请求；
    所述统一数据管理网元接收来自所述统一数据库网元的绑定信息改变通知，所述绑定信息改变通知包括与所述终端的标识、所述S-NSSAI和所述DNN对应的所述策略控制网元的标识。
  14. 根据权利要求11-13任一项所述的方法，其特征在于，所述方法还包括：
    所述网络设备存储所述终端的标识、所述S-NSSAI、所述DNN和所述策略控制网 元的标识的对应关系。
  15. 根据权利要求14所述的方法，其特征在于，在所述网络设备向所述第一会话管理网元发送所述策略控制网元的标识之前，所述方法还包括：
    所述网络设备根据所述终端的标识、所述S-NSSAI、所述DNN和所述对应关系，确定所述策略控制网元的标识。
  16. 根据权利要求11所述的方法，其特征在于，所述网络设备为统一数据管理网元；在所述网络设备向所述第一会话管理网元发送所述策略控制网元的标识之前，所述方法还包括：
    所述统一数据管理网元向统一数据库网元发送请求消息，所述请求消息包括所述终端的标识、所述S-NSSAI和所述DNN；
    所述统一数据管理网元接收来自所述统一数据库网元的与所述终端的标识、所述S-NSSAI和所述DNN对应的所述策略控制网元的标识。
  17. 根据权利要求11-16任一项所述的方法，其特征在于，在所述网络设备向所述第一会话管理网元发送所述策略控制网元的标识之前，所述方法还包括：
    所述网络设备确定所述终端在非漫游或家乡路由场景下建立所述第一会话。
  18. 根据权利要求11，12，14，15或17所述的方法，其特征在于，所述网络设备为移动管理网元；所述网络设备确定正在建立的终端的第一会话与已建立的所述终端的第二会话具有相同的S-NSSAI和DNN，具体为：
    所述移动管理网元根据所述终端的签约数据、运营商策略和来自所述终端的会话建立请求中的至少一个，确定正在建立的所述终端的第一会话与已建立的所述终端的第二会话具有相同的S-NSSAI和DNN。
  19. 根据权利要求11，12，14，15、17或18所述的方法，其特征在于，所述网络设备为移动管理网元；所述方法还包括：
    所述移动管理网元向所述第一会话管理网元发送指示信息，所述指示信息用于指示所述策略控制网元的标识对应的所述策略控制网元是会话管理网元选择的策略控制网元；或者，所述指示信息用于指示所述第一会话管理网元选择所述策略控制网元的标识对应的所述策略控制网元；或者，所述指示信息用于指示所述第一会话存在对应的绑定信息。
  20. 根据权利要求11，12，14，15、17或18所述的方法，其特征在于，所述网络设备为移动管理网元；所述方法还包括：
    所述移动管理网元在特殊字段中携带所述策略控制网元的标识，所述特殊字段用于指示所述策略控制网元的标识对应的所述策略控制网元是会话管理网元选择的策略控制网元。
  21. 根据权利要求11-17任一项所述的方法，其特征在于，所述网络设备为统一数据管理网元；在所述网络设备确定正在建立的终端的第一会话与已建立的所述终端的第二会话具有相同的S-NSSAI和DNN之前，所述方法还包括：
    所述统一数据管理网元接收来自所述第一会话管理网元的注册请求，所述注册请求包括所述终端的标识、所述S-NSSAI和所述DNN；
    相应的，所述网络设备确定正在建立的终端的第一会话与已建立的所述终端的第 二会话具有相同的S-NSSAI和DNN，具体为：
    所述统一数据管理网元根据所述终端的标识、所述S-NSSAI和所述DNN，确定正在建立的所述终端的第一会话与已建立的所述终端的第二会话具有相同的S-NSSAI和DNN。
  22. 一种移动管理网元，其特征在于，所述移动管理网元包括：处理模块和收发模块；
    所述处理模块，用于确定正在建立的终端的第一会话与已建立的所述终端的第二会话具有相同的单个网络切片选择辅助信息S-NSSAI和数据网络名称DNN；
    所述收发模块，用于向第一会话管理网元发送用于创建所述第一会话的第一请求消息，所述第一请求消息包括所述终端的标识、所述S-NSSAI、所述DNN和指示信息，所述指示信息用于指示所述第一会话管理网元从绑定支持网元获取策略控制网元的标识；或者，所述指示信息用于指示已建立与所述第一会话具有相同的S-NSSAI和DNN的所述终端的会话；或者，所述指示信息用于指示所述第一会话存在对应的绑定信息。
  23. 根据权利要求22所述的移动管理网元，其特征在于，所述处理模块具体用于：
    根据所述终端的签约数据、运营商策略和来自所述终端的会话建立请求中的至少一个，确定正在建立的所述终端的第一会话与已建立的所述终端的第二会话具有相同的S-NSSAI和DNN。
  24. 根据权利要求22或23所述的移动管理网元，其特征在于，
    所述处理模块，还用于确定所述终端在非漫游或家乡路由场景下建立所述第一会话。
  25. 一种网络设备，其特征在于，所述网络设备包括：处理模块和收发模块；
    所述处理模块，用于确定正在建立的终端的第一会话与已建立的所述终端的第二会话具有相同的单个网络切片选择辅助信息S-NSSAI和数据网络名称DNN；
    所述收发模块，用于向所述第一会话对应的第一会话管理网元发送所述第二会话对应的第二会话管理网元选择的策略控制网元的标识，所述策略控制网元的标识用于所述第一会话管理网元选择所述策略控制网元。
  26. 根据权利要求25所述的网络设备，其特征在于，
    所述收发模块，还用于在建立所述第二会话的过程中，接收来自所述第二会话管理网元的所述策略控制网元的标识。
  27. 根据权利要求25或26所述的网络设备，其特征在于，所述网络设备还包括：存储模块；
    所述存储模块，用于存储所述终端的标识、所述S-NSSAI、所述DNN和所述策略控制网元的标识的对应关系。
  28. 根据权利要求27所述的网络设备，其特征在于，
    所述处理模块，还用于根据所述终端的标识、所述S-NSSAI、所述DNN和所述对应关系，确定所述策略控制网元的标识。
  29. 根据权利要求25-28任一项所述的网络设备，其特征在于，
    所述处理模块，还用于确定所述终端在非漫游或家乡路由场景下建立所述第一会话。
  30. 根据权利要求25-29任一项所述的网络设备，其特征在于，所述网络设备为移动管理网元；所述处理模块，用于确定正在建立的终端的第一会话与已建立的所述终端的第二会话具有相同的S-NSSAI和DNN，具体为：
    用于根据所述终端的签约数据、运营商策略和来自所述终端的会话建立请求中的至少一个，确定正在建立的所述终端的第一会话与已建立的所述终端的第二会话具有相同的S-NSSAI和DNN。
  31. 根据权利要求25-30任一项所述的网络设备，其特征在于，所述网络设备为移动管理网元；
    所述收发模块，还用于向所述第一会话管理网元发送指示信息，所述指示信息用于指示所述策略控制网元的标识对应的所述策略控制网元是会话管理网元选择的策略控制网元；或者，所述指示信息用于指示所述第一会话管理网元选择所述策略控制网元的标识对应的所述策略控制网元；或者，所述指示信息用于指示所述第一会话存在对应的绑定信息。
  32. 根据权利要求25-30任一项所述的网络设备，其特征在于，所述网络设备为移动管理网元；
    所述收发模块，还用于在特殊字段中携带所述策略控制网元的标识，所述特殊字段用于指示所述策略控制网元的标识对应的所述策略控制网元是会话管理网元选择的策略控制网元。
  33. 根据权利要求25-29任一项所述的网络设备，其特征在于，所述网络设备为统一数据管理网元；
    所述收发模块，还用于接收来自所述第一会话管理网元的注册请求，所述注册请求包括所述终端的标识、所述S-NSSAI和所述DNN；
    相应的，所述处理模块，用于确定正在建立的终端的第一会话与已建立的所述终端的第二会话具有相同的S-NSSAI和DNN，具体为：
    用于根据所述终端的标识、所述S-NSSAI和所述DNN，确定正在建立的所述终端的第一会话与已建立的所述终端的第二会话具有相同的S-NSSAI和DNN。
  34. 一种策略控制系统，其特征在于，包括：移动管理网元和第一会话管理网元；
    所述移动管理网元，用于向第一会话管理网元发送用于创建第一会话的第一请求消息，所述第一请求消息包括终端的标识、单个网络切片选择辅助信息S-NSSAI和数据网络名称DNN；
    所述第一会话管理网元，用于接收来自所述移动管理网元的所述第一请求消息，并向绑定支持网元发送第二请求消息，所述第二请求消息包括所述终端的标识、所述S-NSSAI和所述DNN；
    所述第一会话管理网元，还用于接收来自所述绑定支持网元的所述策略控制网元的标识，并根据所述策略控制网元的标识选择所述策略控制网元。
  35. 根据权利要求34所述的系统，其特征在于，
    所述移动管理网元，还用于确定所述第一会话与已建立的所述终端的第二会话具有相同的S-NSSAI和DNN；
    相应的，所述第一请求消息还包括指示信息，所述指示信息用于指示所述第一会 话管理网元从所述绑定支持网元获取策略控制网元的标识；或者，所述指示信息用于指示已建立与所述第一会话具有相同的S-NSSAI和DNN的所述终端的会话；或者，所述指示信息用于指示所述第一会话存在对应的绑定信息。
  36. 根据权利要求34或35所述的系统，其特征在于，所述系统还包括第二会话管理网元；
    所述第二会话管理网元，用于在建立第二会话的过程中，选择所述策略控制网元，并向所述绑定支持网元发送注册请求，所述注册请求包括所述终端的标识、所述
    S-NSSAI、所述DNN和所述策略控制网元的标识。
  37. 一种策略控制系统，其特征在于，包括网络设备和第一会话管理网元；
    所述网络设备，用于确定正在建立的终端的第一会话与已建立的所述终端的第二会话具有相同的单个网络切片选择辅助信息S-NSSAI和数据网络名称DNN；
    所述网络设备，还用于向所述第一会话对应的第一会话管理网元发送所述第二会话对应的第二会话管理网元选择的策略控制网元的标识；
    所述第一会话管理网元，用于接收来自所述网络设备的所述策略控制网元的标识，并根据所述策略控制网元的标识选择所述策略控制网元。
  38. 根据权利要求37所述的系统，其特征在于，所述系统还包括所述第二会话管理网元；
    所述第二会话管理网元，用于在建立所述第二会话的过程中，选择所述策略控制网元，并向所述网络设备发送所述策略控制网元的标识；
    所述网络设备，用于接收来自所述第二会话管理网元的所述策略控制网元的标识。
  39. 一种策略控制系统，其特征在于，所述策略控制系统包括：统一数据管理网元和第一会话管理网元；
    所述统一数据管理网元，用于向所述第一会话管理网元发送指示信息，所述指示信息用于指示所述第一会话管理网元从绑定支持网元获取策略控制网元的标识；或者，所述指示信息用于指示已建立与正在建立的终端的第一会话具有相同的单个网络切片选择辅助信息S-NSSAI和数据网络名称DNN的所述终端的会话；或者，所述指示信息用于指示所述第一会话存在对应的绑定信息；
    所述第一会话管理网元，用于接收来自所述统一数据管理网元的所述指示信息，并根据所述指示信息向所述绑定支持网元发送请求消息，所述请求消息包括所述终端的标识、所述S-NSSAI和所述DNN；
    所述第一会话管理网元，还用于接收来自所述绑定支持网元的所述策略控制网元的标识，并根据所述策略控制网元的标识选择所述策略控制网元。
  40. 一种策略控制方法，其特征在于，所述方法包括：
    第一策略控制网元接收来自第一会话管理管理网元的策略控制创建请求，所述策略控制创建请求包括终端的标识、单个网络切片选择辅助信息S-NSSAI和数据网络名称DNN；
    所述第一策略控制网元向绑定支持网元发送所述终端的标识、所述S-NSSAI、所述DNN和所述第一策略控制网元的标识；
    所述第一策略控制网元接收来自所述绑定支持网元的第二策略控制网元的标识， 并向所述第一会话管理网元发送所述第二策略控制网元的标识，所述第二策略控制网元的标识为所述绑定支持网元保存的与所述终端的标识、所述S-NSSAI和所述DNN对应的策略控制网元的标识。
  41. 根据权利要求40所述的方法，其特征在于，所述方法还包括：
    所述第一策略控制网元确定需要为所述终端的标识、所述S-NSSAI和所述DNN的组合选择相同的策略控制网元；
    所述第一策略控制网元向所述绑定支持网元发送指示信息，所述指示信息用于指示为所述终端的标识、所述S-NSSAI和所述DNN的组合选择相同的策略控制网元。
  42. 一种策略控制方法，其特征在于，所述方法包括：
    绑定支持网元接收来自第一策略控制网元的终端的标识、单个网络切片选择辅助信息S-NSSAI、数据网络名称DNN和所述第一策略控制网元的标识；
    所述绑定支持网元确定已经存在与所述终端的标识、所述S-NSSAI和所述DNN的组合对应的第二策略控制网元的标识；
    所述绑定支持网元向所述第一策略控制网元发送所述第二策略控制网元的标识。
  43. 根据权利要求42所述的方法，其特征在于，所述方法还包括：
    在第二会话建立过程中，所述绑定支持网元接收来自所述第二策略控制网元的所述终端的标识、所述S-NSSAI、所述DNN和所述第二策略控制网元的标识；
    所述绑定支持网元存储所述终端的标识、所述S-NSSAI、所述DNN和所述第二策略控制网元的标识的对应关系。
  44. 根据权利要求42或43所述的方法，其特征在于，所述方法还包括：
    所述绑定支持网元接收来自所述第一策略控制网元的指示信息，所述指示信息用于指示为所述终端的标识、所述S-NSSAI和所述DNN的组合选择相同的策略控制网元；
    所述绑定支持网元根据所述指示信息确定向所述第一策略控制网元发送所述第二策略控制网元的标识。
  45. 一种第一策略控制网元，其特征在于，所述第一策略控制网元包括：接收模块和发送模块；
    所述接收模块，用于接收来自第一会话管理管理网元的策略控制创建请求，所述策略控制创建请求包括终端的标识、单个网络切片选择辅助信息S-NSSAI和数据网络名称DNN；
    所述发送模块，用于向绑定支持网元发送所述终端的标识、所述S-NSSAI、所述DNN和所述第一策略控制网元的标识；
    所述接收模块，还用于接收来自所述绑定支持网元的第二策略控制网元的标识；
    所述发送模块，还用于向所述第一会话管理网元发送所述第二策略控制网元的标识，所述第二策略控制网元的标识为所述绑定支持网元保存的与所述终端的标识、所述S-NSSAI和所述DNN对应的策略控制网元的标识。
  46. 根据权利要求45所述的第一策略控制网元，其特征在于，所述第一策略控制网元还包括：处理模块；
    所述处理模块，用于确定需要为所述终端的标识、所述S-NSSAI和所述DNN的组合选择相同的策略控制网元；
    所述发送模块，还用于向所述绑定支持网元发送指示信息，所述指示信息用于指示为所述终端的标识、所述S-NSSAI和所述DNN的组合选择相同的策略控制网元。
  47. 一种绑定支持网元，其特征在于，所述绑定支持网元包括：收发模块和处理模块；
    所述收发模块，用于接收来自第一策略控制网元的终端的标识、单个网络切片选择辅助信息S-NSSAI、数据网络名称DNN和所述第一策略控制网元的标识；
    所述处理模块，用于确定已经存在与所述终端的标识、所述S-NSSAI和所述DNN的组合对应的第二策略控制网元的标识；
    所述收发模块，还用于向所述第一策略控制网元发送所述第二策略控制网元的标识。
  48. 根据权利要求47所述的绑定支持网元，其特征在于，所述绑定支持网元还包括：存储模块；
    所述收发模块，还用于在第二会话建立过程中，接收来自所述第二策略控制网元的所述终端的标识、所述S-NSSAI、所述DNN和所述第二策略控制网元的标识；
    所述存储模块，用于存储所述终端的标识、所述S-NSSAI、所述DNN和所述第二策略控制网元的标识的对应关系。
  49. 根据权利要求47或48所述的绑定支持网元，其特征在于，
    所述收发模块，还用于接收来自所述第一策略控制网元的指示信息，所述指示信息用于指示为所述终端的标识、所述S-NSSAI和所述DNN的组合选择相同的策略控制网元；
    所述处理模块，还用于根据所述指示信息确定向所述第一策略控制网元发送所述第二策略控制网元的标识。
  50. 一种策略控制系统，其特征在于，包括：第一会话管理网元和第一策略控制网元；
    所述第一会话管理网元，用于向所述第一策略控制网元发送策略控制创建请求，所述策略控制创建请求包括终端的标识、单个网络切片选择辅助信息S-NSSAI和数据网络名称DNN；
    所述第一策略控制网元，用于接收来自所述第一会话管理网元的所述策略控制创建请求，并向绑定支持网元发送所述终端的标识、所述S-NSSAI、所述DNN和所述第一策略控制网元的标识；
    所述第一策略控制网元，还用于接收来自所述绑定支持网元的第二策略控制网元的标识，并向所述第一会话管理网元发送所述第二策略控制网元的标识，所述第二策略控制网元的标识为所述绑定支持网元保存的与所述终端的标识、所述S-NSSAI和所述DNN对应的策略控制网元的标识；
    所述第一会话管理网元，还用于接收来自所述第一策略控制网元的所述第二策略控制网元的标识，并根据所述第二策略控制网元的标识为第一会话选择所述第二策略控制网元。
  51. 根据权利要求50所述的策略控制系统，其特征在于，
    所述第一会话管理网元，还用于接收来自第一移动管理网元的用于创建所述第一 会话的第一请求消息，所述第一请求消息包括所述终端的标识、所述S-NSSAI和所述DNN；
    所述第一会话管理网元，还用于为所述第一会话选择所述第一策略控制网元。
  52. 根据权利要求50或51所述的策略控制系统，其特征在于，
    所述第一策略控制网元，还用于确定需要为所述终端的标识、所述S-NSSAI和所述DNN的组合选择相同的策略控制网元；
    所述第一策略控制网元，还用于向所述绑定支持网元发送指示信息，所述指示信息用于指示为所述终端的标识、所述S-NSSAI和所述DNN的组合选择相同的策略控制网元。
  53. 根据权利要求52所述的策略控制系统，其特征在于，所述第一策略控制网元，还用于向所述绑定支持网元发送指示信息，包括：
    所述第一策略控制网元，还用于在确定所述终端在非漫游或家乡路由场景下建立所述第一会话的情况下，向所述绑定支持网元发送指示信息。
  54. 根据权利要求50-53任一项所述的策略控制系统，其特征在于，所述策略控制系统还包括第二会话管理网元、所述第二策略控制网元和所述绑定支持网元；
    所述第二会话管理网元，用于接收来自第二移动管理网元的用于创建第二会话的第二请求消息，所述第二请求消息包括所述终端的标识、所述S-NSSAI和所述DNN；
    所述第二会话管理网元，用于为所述第二会话选择所述第二策略控制网元，并向所述第二策略控制网元发送策略控制创建请求，所述策略控制创建请求包括所述终端的标识、所述S-NSSAI和所述DNN；
    所述第二策略控制网元，用于接收来自所述第二会话管理网元的所述策略控制创建请求，并向所述绑定支持网元发送所述终端的标识、所述S-NSSAI、所述DNN和所述第二策略控制网元的标识；
    所述绑定支持网元，用于接收来自所述第二策略控制网元的所述终端的标识、所述S-NSSAI、所述DNN和所述第二策略控制网元的标识，并存储所述终端的标识、所述S-NSSAI、所述DNN和所述第二策略控制网元的标识的对应关系。
  55. 一种策略控制方法，其特征在于，所述方法包括：
    第一策略控制网元接收来自第一会话管理网元的策略控制创建请求，所述策略控制创建请求包括终端的标识、单个网络切片选择辅助信息S-NSSAI和数据网络名称DNN；
    所述第一策略控制网元向绑定支持网元发送所述终端的标识、所述S-NSSAI、所述DNN和所述第一策略控制网元所属的第一策略控制网元组标识；
    所述第一策略控制网元接收来自所述绑定支持网元的第二策略控制网元组标识，并向所述第一会话管理网元发送所述第二策略控制网元组标识，所述第二策略控制网元组标识为所述绑定支持网元保存的与所述终端的标识、所述S-NSSAI和所述DNN对应的策略控制网元组标识。
  56. 根据权利要求55所述的方法，其特征在于，所述方法还包括：
    所述第一策略控制网元确定需要为所述终端的标识、所述S-NSSAI和所述DNN的组合选择相同的策略控制网元组；
    所述第一策略控制网元向所述绑定支持网元发送指示信息，所述指示信息用于指 示为所述终端的标识、所述S-NSSAI和所述DNN的组合选择相同的策略控制网元组。
  57. 一种策略控制方法，其特征在于，所述方法包括：
    绑定支持网元接收来自第一策略控制网元的终端的标识、单个网络切片选择辅助信息S-NSSAI、数据网络名称DNN和所述第一策略控制网元所属的第一策略控制网元组标识；
    所述绑定支持网元确定已经存在与所述终端的标识、所述S-NSSAI和所述DNN的组合对应的第二策略控制网元组标识；
    所述绑定支持网元向所述第一策略控制网元发送所述第二策略控制网元组标识。
  58. 根据权利要求57所述的方法，其特征在于，所述方法还包括：
    在第二会话建立过程中，所述绑定支持网元接收来自第二策略控制网元的所述终端的标识、所述S-NSSAI、所述DNN和所述第二策略控制网元所属的所述第二策略控制网元组标识；
    所述绑定支持网元存储所述终端的标识、所述S-NSSAI、所述DNN和所述第二策略控制网元组标识的对应关系。
  59. 根据权利要求57或58所述的方法，其特征在于，所述方法还包括：
    所述绑定支持网元接收来自所述第一策略控制网元的指示信息，所述指示信息用于指示为所述终端的标识、所述S-NSSAI和所述DNN的组合选择相同的策略控制网元组；
    所述绑定支持网元根据所述指示信息确定向所述第一策略控制网元发送所述第二策略控制网元组标识。
  60. 一种第一策略控制网元，其特征在于，所述第一策略控制网元包括：接收模块和发送模块；
    所述接收模块，用于接收来自第一会话管理网元的策略控制创建请求，所述策略控制创建请求包括终端的标识、单个网络切片选择辅助信息S-NSSAI和数据网络名称DNN；
    所述发送模块，用于向绑定支持网元发送所述终端的标识、所述S-NSSAI、所述DNN和所述第一策略控制网元所属的第一策略控制网元组标识；
    所述接收模块，还用于接收来自所述绑定支持网元的第二策略控制网元组标识；
    所述发送模块，还用于向所述第一会话管理网元发送所述第二策略控制网元组标识，所述第二策略控制网元组标识为所述绑定支持网元保存的与所述终端的标识、所述S-NSSAI和所述DNN对应的策略控制网元组标识。
  61. 根据权利要求60所述的第一策略控制网元，其特征在于，所述第一策略控制网元还包括：处理模块；
    所述处理模块，用于确定需要为所述终端的标识、所述S-NSSAI和所述DNN的组合选择相同的策略控制网元组；
    所述发送模块，用于向所述绑定支持网元发送指示信息，所述指示信息用于指示为所述终端的标识、所述S-NSSAI和所述DNN的组合选择相同的策略控制网元组。
  62. 一种绑定支持网元，其特征在于，所述绑定支持网元包括：处理模块和收发模块；
    所述收发模块，用于接收来自第一策略控制网元的终端的标识、单个网络切片选择辅助信息S-NSSAI、数据网络名称DNN和所述第一策略控制网元所属的第一策略控制网元组标识；
    所述处理模块，用于确定已经存在与所述终端的标识、所述S-NSSAI和所述DNN的组合对应的第二策略控制网元组标识；
    所述收发模块，还用于向所述第一策略控制网元发送所述第二策略控制网元组标识。
  63. 根据权利要求62所述的绑定支持网元，其特征在于，所述绑定支持网元还包括：存储模块；
    所述收发模块，还用于在第二会话建立过程中，接收来自第二策略控制网元的所述终端的标识、所述S-NSSAI、所述DNN和所述第二策略控制网元所属的所述第二策略控制网元组标识；
    所述存储模块，用于存储所述终端的标识、所述S-NSSAI、所述DNN和所述第二策略控制网元组标识的对应关系。
  64. 根据权利要求62或63所述的绑定支持网元，其特征在于，
    所述收发模块，还用于接收来自所述第一策略控制网元的指示信息，所述指示信息用于指示为所述终端的标识、所述S-NSSAI和所述DNN的组合选择相同的策略控制网元组；
    所述处理模块，还用于根据所述指示信息确定向所述第一策略控制网元发送所述第二策略控制网元组标识。
  65. 一种策略控制系统，其特征在于，包括：第一会话管理网元和第一策略控制网元；
    所述第一会话管理网元，用于向所述第一策略控制网元发送策略控制创建请求，所述策略控制创建请求包括终端的标识、单个网络切片选择辅助信息S-NSSAI和数据网络名称DNN；
    所述第一策略控制网元，用于接收来自所述第一会话管理网元的所述策略控制创建请求，并向绑定支持网元发送所述终端的标识、所述S-NSSAI、所述DNN和所述第一策略控制网元所属的第一策略控制网元组标识；
    所述第一策略控制网元，还用于接收来自所述绑定支持网元的第二策略控制网元组标识，并向所述第一会话管理网元发送所述第二策略控制网元组标识，所述第二策略控制网元组标识为所述绑定支持网元保存的与所述终端的标识、所述S-NSSAI和所述DNN对应的策略控制网元组标识；
    所述第一会话管理网元，还用于接收来自所述第一策略控制网元的所述第二策略控制网元组标识，并根据所述第二策略控制网元组标识为第一会话选择第二策略控制网元，所述第二策略控制网元属于所述第二策略控制网元组。
  66. 根据权利要求65所述的策略控制系统，其特征在于，
    所述第一会话管理网元，还用于接收来自第一移动管理网元的用于创建所述第一会话的第一请求消息，所述第一请求消息包括所述终端的标识、所述S-NSSAI和所述DNN；
    所述第一会话管理网元，用于为所述第一会话选择所述第一策略控制网元。
  67. 根据权利要求65或66所述的策略控制系统，其特征在于，
    所述第一策略控制网元，还用于确定需要为所述终端的标识、所述S-NSSAI和所述DNN的组合选择相同的策略控制网元组；
    所述第一策略控制网元，还用于向所述绑定支持网元发送指示信息，所述指示信息用于指示为所述终端的标识、所述S-NSSAI和所述DNN的组合选择相同的策略控制网元组。
  68. 根据权利要求67所述的策略控制系统，其特征在于，所述第一策略控制网元，还用于向所述绑定支持网元发送指示信息，包括：
    所述第一策略控制网元，还用于在确定所述终端在非漫游或家乡路由场景下建立所述第一会话的情况下，向所述绑定支持网元发送指示信息。
  69. 根据权利要求65-68任一项所述的策略控制系统，其特征在于，所述策略控制系统还包括第二会话管理网元、所述第二策略控制网元和所述绑定支持网元；
    所述第二会话管理网元，用于接收来自第二移动管理网元的用于创建第二会话的第二请求消息，所述第二请求消息包括所述终端的标识、所述S-NSSAI和所述DNN；
    所述第二会话管理网元，用于为所述第二会话选择所述第二策略控制网元，并向所述第二策略控制网元发送策略控制创建请求，所述策略控制创建请求包括所述终端的标识、所述S-NSSAI和所述DNN；
    所述第二策略控制网元，用于接收来自所述第二会话管理网元的所述策略控制创建请求，并向所述绑定支持网元发送所述终端的标识、所述S-NSSAI、所述DNN和所述第二策略控制网元所属的第二策略控制网元组标识；
    所述绑定支持网元，用于接收来自所述第二策略控制网元的所述终端的标识、所述S-NSSAI、所述DNN和所述第二策略控制网元组标识，并存储所述终端的标识、所述S-NSSAI、所述DNN和所述第二策略控制网元组标识的对应关系。
  70. 一种移动管理网元，其特征在于，包括：处理器和存储器；所述存储器用于存储计算机执行指令，当所述移动管理网元运行时，所述处理器执行所述存储器存储的所述计算机执行指令，以使所述移动管理网元执行如权利要求1-4任一项，或8-10任一项所述的策略控制方法。
  71. 一种网络设备，其特征在于，包括：处理器和存储器；所述存储器用于存储计算机执行指令，当所述网络设备运行时，所述处理器执行所述存储器存储的所述计算机执行指令，以使所述网络设备执行如权利要求11-21任一项所述的策略控制方法。
  72. 一种第一策略控制网元，其特征在于，包括：处理器和存储器；所述存储器用于存储计算机执行指令，当所述第一策略控制网元运行时，所述处理器执行所述存储器存储的所述计算机执行指令，以使所述第一策略控制网元执行如权利要求40-41任一项，或55-56任一项所述的策略控制方法。
  73. 一种绑定支持网元，其特征在于，包括：处理器和存储器；所述存储器用于存储计算机执行指令，当所述绑定支持网元运行时，所述处理器执行所述存储器存储的所述计算机执行指令，以使所述绑定支持网元执行如权利要求42-44任一项，或57-59任一项所述的策略控制方法。
  74. 一种处理装置，其特征在于，包括：
    存储器，用于存储计算机程序；
    处理器，用于从所述存储器调用并运行所述计算机程序，以执行如权利要求1-4任一项，或8-21任一项，40-44任一项，或55-59任一项所述的策略控制方法。
  75. 一种处理器，其特征在于，用于执行如权利要求1-4任一项，或8-21任一项，40-44任一项，或55-59任一项所述的策略控制方法。
  76. 一种芯片系统，其特征在于，包括：
    存储器，用于存储计算机程序；
    处理器，用于从所述存储器调用并运行所述计算机程序，使得安装有所述芯片系统的设备执行如权利要求1-4任一项，或8-21任一项，40-44任一项，或55-59任一项所述的策略控制方法。
  77. 一种计算机可读存储介质，其特征在于，包括计算机程序，当其在计算机上运行时，使得所述计算机执行如权利要求1-4任一项，或8-21任一项，40-44任一项，或55-59任一项所述的策略控制方法。
  78. 一种计算机程序产品，其特征在于，所述计算机程序产品包括计算机程序，当所述计算机程序在计算机上运行时，使得计算机执行如权利要求1-4任一项，或8-21任一项，40-44任一项，或55-59任一项所述的策略控制方法。
  79. 一种用来执行权利要求1-4任一项，或8-21任一项，40-44任一项，或55-59任一项所述的策略控制方法的装置。
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