WO2023236764A1 - 一种分配互联网协议地址的方法及通信装置 - Google Patents

一种分配互联网协议地址的方法及通信装置 Download PDF

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Publication number
WO2023236764A1
WO2023236764A1 PCT/CN2023/095500 CN2023095500W WO2023236764A1 WO 2023236764 A1 WO2023236764 A1 WO 2023236764A1 CN 2023095500 W CN2023095500 W CN 2023095500W WO 2023236764 A1 WO2023236764 A1 WO 2023236764A1
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WIPO (PCT)
Prior art keywords
network element
session management
management network
session
user plane
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PCT/CN2023/095500
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English (en)
French (fr)
Inventor
夏林瑾
尤正刚
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华为技术有限公司
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Publication of WO2023236764A1 publication Critical patent/WO2023236764A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/50—Address allocation
    • H04L61/5007—Internet protocol [IP] addresses
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/50—Address allocation
    • H04L61/5061—Pools of addresses
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/08—Mobility data transfer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming

Definitions

  • Embodiments of the present application relate to the field of communication, and more specifically, to a method and communication device for allocating an Internet protocol address.
  • the control plane network element such as the session management function (SMF) network element
  • the user plane network element such as the session management function (SMF) network element
  • IP Internet Protocol
  • Embodiments of this application provide a method for allocating Internet Protocol (IP) addresses, with a view to allocating IP addresses to terminal devices based on the IP address pool planned at the visited location.
  • IP Internet Protocol
  • a method for allocating an IP address is provided.
  • the method can be executed by the first session management network element, or can also be executed by a component (such as a chip or circuit) of the first session management network element.
  • a component such as a chip or circuit
  • the following description takes the execution by the first session management network element as an example.
  • the method includes: the first session management network element obtains a target data network access identifier (DNAI) set corresponding to the session identifier of the terminal device and the access location information of the terminal device, and the access location information is used for Indicates the access location of the terminal device, which is located outside the contracting place of the dedicated data network name (DNN) contracted by the terminal device.
  • the session identifier is used to identify the session that the terminal device requests to activate;
  • the first session management network element sends a request message to the first user plane network element according to the target DNAI set and the access location information.
  • the request message is used to request to allocate an IP address to the terminal device.
  • the first user plane network element Support at least one target DNAI in the target DNAI set, and the service area of the first user plane network element includes the access location; the first session management network element receives the terminal device from the first user plane network element IP address.
  • the first session management network element requests the first user plane network element to allocate an IP address to the terminal device. Since the first user plane network element covers the access location of the terminal device, the IP address assigned by the first user plane network element to the terminal device is the same as the access location of the terminal device. Related, that is, it is possible to allocate IP addresses to terminal devices based on the IP address pool planned by the visited location, thereby meeting the operator's needs for region-based service management based on IP addresses.
  • the target DNAI set is used to select the first user plane network element that provides services for the terminal device.
  • At least one target DNAI included in the target DNAI set is the DNAI corresponding to the session identifier of the terminal device, or is the intersection of the DNAI supported by the first session management network element and the DNAI corresponding to the session identifier of the terminal device.
  • the first session management network element is deployed at the contracting place of the dedicated DNN, and the first session management network element acquires the target DNAI set, including: the first The session management network element sends the session identifier to the policy control network element; the first session management network element receives the target DNAI set from the policy control network element.
  • the first session The management network element may receive the target DNAI set from the policy control network element, and select the first user plane network element that allocates an IP address to the terminal device based on the target DNAI set.
  • the target DNAI set obtained by the first session management network element from the policy control network element includes the DNAI corresponding to the session identifier.
  • the first session management network element is deployed at the contracting place of the dedicated DNN, and the first session management network element acquires the target DNAI set, including: the first The session management network element sends the session identifier to the policy control network element; the first session management network element receives the offloading policy from the policy control network element, and the offloading policy is the offloading policy of the subscription service corresponding to the session; the first session The management network element determines the target DNAI set according to the traffic distribution policy.
  • the first session The management network element receives the offloading policy from the policy control network element and determines the target DNAI set according to the offloading policy, so that the first user plane network element that allocates an IP address to the terminal device can be selected based on the target DNAI set.
  • the target DNAI set determined by the first session management network element according to the offload policy includes the DNAI corresponding to the offload policy.
  • the local configuration information of the first session management network element includes the corresponding relationship between different offloading policies and different DNAIs. Then, after the first session management network element receives the offloading policy of the contracted service, it will process the offloading policy according to the offloading policy of the contracted service and the corresponding relationship.
  • the target DNAI set is determined, and the target DNAI set includes the DNAI corresponding to the offloading policy of the contracted service in the corresponding relationship.
  • the method further includes: the first session management network element sending the IP address to a second user plane network element, and the second user plane network element is deployed on the Where the dedicated DNN is signed, the second user plane network element is used to establish the session for the terminal device based on the IP address; the first session management network element sends the IP address to the terminal device through the access management network element.
  • the first session management network element sends the IP address to the second user plane network element and the terminal device, so that the second user plane network element and the terminal device can establish a session for the terminal device based on the IP address.
  • the first session management network element can also send the N9 interface address of the uplink offload user plane network element to the second user plane network element, so that the second user plane network element can send the downlink to the terminal device according to the N9 interface address.
  • the data packet is sent to the uplink offload user plane network element.
  • the service area of the uplink offload user plane network element includes the access location of the terminal equipment.
  • the first session management network element is deployed outside the contracting place of the dedicated DNN, and the first session management network element obtains the target DNAI set, including: the third A session management network element sends the session identifier and the DNAI supported by the first session management network element to a second session management network element.
  • the second session management network element is deployed at the contracting location of the dedicated DNN; the first session management network element The element receives the target DNAI set from the second session management network element, where the target DNAI set includes the intersection of the DNAI corresponding to the session identifier and the DNAI supported by the first session management network element.
  • the access location of the terminal device is located in the service area of the first session management network element, and the first session management network element is deployed outside the dedicated DNN contracting area, then the first session management network element and the second session The management network element negotiates to determine the target DNAI set.
  • the first session management network element is deployed outside the contracting place of the dedicated DNN, and the first session management network element obtains the target DNAI set, including: the The first session management network element sends the session identifier to the second session management network element, which is deployed at the contracting location of the dedicated DNN; the first session management network element receives the session identifier from the second session management network element. the DNAI corresponding to the session identifier; the first session management network element determines that the target DNAI set includes the intersection of the DNAI corresponding to the session identifier and the DNAI supported by the first session management network element.
  • the access location of the terminal device is located in the service area of the first session management network element, and the first session management network element is deployed outside the dedicated DNN contracting area, then the first session management network element and the second session The management network element negotiates to determine the target DNAI set.
  • the method further includes: the first session management network element receiving indication information from the second session management network element, the indication information being used to indicate that the target user
  • the surface network element allocates an IP address to the terminal device.
  • the target user plane network element is selected based on the intersection of the DNAI corresponding to the session identifier and the DNAI supported by the first session management network element; the first session management network element is selected based on the The target DNAI set and the access location information send a request message to the first user plane network element, including: the first session management network element determines to support at least one target in the target DNAI set based on the indication information and the target DNAI set.
  • the target user plane network element; the first session management network element sends the request message to the first user plane network element.
  • the first session management network element determines, based on the access location information, that the first user plane network element is the target user plane network element whose service area includes the access location in at least one target user plane network element, or It can be understood that the first session management network element determines the first user plane network element from the at least one target user plane network element according to the access location information.
  • the service area includes the access location.
  • the method further includes: the first session management network element sending the IP address to the second session management network element; the first session management network element connecting The incoming management network element sends the IP address to the terminal device.
  • the first session management network element sends the IP address to the second user plane network element and the terminal device, so that the second user plane network element and the terminal device can establish a session for the terminal device based on the IP address.
  • the first session management network element can also send the N9 interface address of the upstream offload user plane network element to the second session management network element, so that the second session management network element can send the N9 interface address of the uplink offload user plane network element.
  • the second user plane network element enables the second user plane network element to send the downlink data packet sent to the terminal device to the uplink offload user plane network element according to the N9 interface address.
  • the service area of the uplink offload user plane network element includes the access location of the terminal equipment.
  • a method for allocating an IP address is provided, which method can be executed by the second session management network element, or can also be executed by a component (such as a chip or circuit) of the second session management network element.
  • a component such as a chip or circuit
  • the following description takes execution by the second session management network element as an example.
  • the method includes: the second session management network element receives a session identifier from the first session management network element and a DNAI supported by the first session management network element.
  • the session identifier is used to identify the session that the terminal device requests to activate.
  • the second session The management network element is deployed at the contracting place of the dedicated DNN contracted by the terminal device, and the first session management network element is deployed outside the contracting place; the second session management network element sends the session identifier to the first session management network element
  • the corresponding target DNAI set, the target DNAI set includes the intersection of the DNAI corresponding to the session identifier and the DNAI supported by the first session management network element; the second session management network element receives the terminal from the first session management network element The IP address of the device.
  • the IP address is assigned to the terminal device by the first user plane network element.
  • the first user plane network element supports at least one target DNAI in the target DNAI set, and the first user plane network element has The service area includes the access location of the terminal device, and the access location of the terminal device is outside the contracted area.
  • the first session management network element requests the first user plane network element to allocate an IP address to the terminal device and sends the IP address to the second session Manage network elements. Since the first user plane network element covers the access location of the terminal device, the IP address allocated by the first user plane network element to the terminal device is related to the access location of the terminal device, that is, an IP address pool based on visited location planning can be implemented Allocate IP addresses to terminal devices, thereby meeting the operator's needs for region-based service management based on IP addresses.
  • the method further includes: the second session management network element sending indication information to the first session management network element, the indication information being used to indicate that the target user plane
  • the network element allocates an IP address to the terminal device.
  • the target user plane network element is selected based on the intersection of the DNAI corresponding to the session identifier and the DNAI supported by the first session management network element.
  • the first user plane network element is at least one
  • the service area in the target user plane network element includes the target user plane network element at the access location.
  • the target user plane network element is a target user plane network element determined from the at least one target user plane network element based on the access location information, that is, the first user plane network element,
  • the service area of the first user plane network element includes the access location.
  • the method further includes: the second session management network element sending the IP address to the second user plane network element, and the second user plane network element is deployed on the second aspect. Where the dedicated DNN is contracted, the second user plane network element is used to establish the session for the terminal device based on the IP address.
  • the second session management network element sends the IP address to the second user plane network element, so that the second user plane network element can establish a session for the terminal device based on the IP address.
  • the second session management network element can also send the N9 interface address of the uplink offload user plane network element to the second user plane network element, so that the second user plane network element can send the downlink to the terminal device according to the N9 interface address.
  • the data packet is sent to the uplink offload user plane network element.
  • the service area of the upstream offload user plane network element includes the access location of the terminal device.
  • the N9 interface address of the upstream offload user plane network element is sent by the first session management network element to the second session management network element.
  • a method of allocating an IP address is provided, which method can be executed by the second session management network element, Alternatively, it may also be executed by a component (such as a chip or circuit) of the second session management network element, which is not limited.
  • a component such as a chip or circuit
  • the following description takes execution by the second session management network as an example.
  • the method includes: the second session management network element receives a session identifier from the first session management network element, the session identifier is used to identify the session requested to be activated by the terminal device, and the second session management network element is deployed on the terminal contracted by the terminal device.
  • the first session management network element is deployed outside the signing place of the dedicated DNN; the second session management network element sends the DNAI corresponding to the session identifier to the first session management network element; the second session management network element
  • the element receives the IP address of the terminal device from the first session management network element.
  • the IP address is allocated by the first user plane network element to the terminal device.
  • the first user plane network element supports the target DNAI corresponding to the session identifier.
  • At least one target DNAI in the set, and the service area of the first user plane network element includes the access location of the terminal device
  • the target DNAI set includes the DNAI corresponding to the session identifier and the DNAI supported by the first session management network element , the access location of the terminal device is outside the contracted location.
  • the first session management network element requests the first user plane network element to allocate an IP address to the terminal device and sends the IP address to the second session Manage network elements. Since the first user plane network element covers the access location of the terminal device, the IP address allocated by the first user plane network element to the terminal device is related to the access location of the terminal device, that is, an IP address pool based on visited location planning can be implemented Allocate IP addresses to terminal devices, thereby meeting the operator's needs for region-based service management based on IP addresses.
  • the method further includes: the second session management network element sending indication information to the first session management network element, the indication information being used to indicate that the target user plane
  • the network element allocates an IP address to the terminal device.
  • the target user plane network element is selected based on the intersection of the DNAI corresponding to the session identifier and the DNAI supported by the first session management network element.
  • the first user plane network element is at least one of the The service area in the target user plane network element includes the target user plane network element at the access location.
  • the method further includes: the second session management network element sending the IP address to the second user plane network element, and the second user plane network element is deployed on the Where the dedicated DNN is contracted, the second user plane network element is used to establish the session for the terminal device based on the IP address.
  • the second session management network element sends the IP address to the second user plane network element, so that the second user plane network element can establish a session for the terminal device based on the IP address.
  • the second session management network element can also send the N9 interface address of the uplink offload user plane network element to the second user plane network element, so that the second user plane network element can send the downlink to the terminal device according to the N9 interface address.
  • the data packet is sent to the uplink offload user plane network element.
  • the service area of the upstream offload user plane network element includes the access location of the terminal device.
  • the N9 interface address of the upstream offload user plane network element is sent by the first session management network element to the second session management network element.
  • the fourth aspect provides a method for establishing a session.
  • the method can be executed by the second user plane network element, or can also be executed by a component (such as a chip or circuit) of the second user plane network element. No further modifications are made to this. Limitation, for convenience of description, the following description takes execution by the second user plane network element as an example.
  • the method includes: the second user plane network element receives the IP address of the terminal device from the session management network element, the IP address is allocated by the first user plane network element to the terminal device, and the first user plane network element supports the session identifier. At least one target DNAI in the corresponding target DNAI set, and the service area of the first user plane network element includes the access location of the terminal device, the session identifier is used to identify the session that the terminal device requests to activate, and the second user The surface network element is deployed in the contracting place of the dedicated DNN contracted by the terminal equipment, and the access location of the terminal device is located in the contracting place of the dedicated DNN. In addition; the second user plane network element establishes the session for the terminal device based on the IP address.
  • the session management network element sends the IP address to the second user plane network element, so that the second user plane network element can establish a session for the terminal device based on the IP address. Since the first user plane network element covers the access location of the terminal device, the IP address allocated by the first user plane network element to the terminal device is related to the access location of the terminal device, that is, an IP address pool based on visited location planning can be implemented Allocate IP addresses to terminal devices, thereby meeting the operator's needs for region-based service management based on IP addresses.
  • the session management network element can also send the N9 interface address of the uplink offload user plane network element to the second user plane network element, so that the second user plane network element can send the downlink data packet to the terminal device according to the N9 interface address. Sent to the uplink offload user plane network element.
  • the service area of the uplink offload user plane network element includes the access location of the terminal equipment.
  • a communication device in a fifth aspect, includes an acquisition unit and a transceiver unit.
  • the acquisition unit is used to acquire a target DNAI set corresponding to a session identifier of a terminal device and access location information of the terminal device.
  • the access location information is The location information is used to indicate the access location of the terminal device, which is located outside the signing place of the dedicated DNN subscribed by the terminal device.
  • the session identifier is used to identify the session that the terminal device requests to activate; the transceiver unit is used to A request message is sent to the first user plane network element according to the target DNAI set and the access location information.
  • the request message is used to request the allocation of an IP address for the terminal device.
  • the first user plane network element supports the target DNAI set. There is at least one target DNAI, and the service area of the first user plane network element includes the access location; the transceiver unit is also used to receive the IP address of the terminal device from the first user plane network element.
  • the acquisition unit includes the transceiver unit, the transceiver unit is also used to send the session identifier to the policy control network element; the transceiver unit is also used to receive data from the policy control network element. Control the target DNAI set of the network element.
  • the acquisition unit includes the transceiver unit and the processing unit.
  • the transceiver unit is also used to send the session identifier to the policy control network element; the transceiver unit is also used to receive
  • the offloading policy from the policy control network element is the offloading policy for the subscription service corresponding to the session; the processing unit is used to determine the target DNAI set according to the offloading policy.
  • the transceiver unit is also used to send the IP address to a second user plane network element, and the second user plane network element is deployed at the contracting location of the dedicated DNN, The second user plane network element is used to establish the session for the terminal device according to the IP address; the transceiver unit is also used to send the IP address to the terminal device through the access management network element.
  • the acquisition unit includes the transceiver unit, and the transceiver unit is further configured to send the session identifier and the session identifier supported by the first session management network element to the second session management network element.
  • DNAI the second session management network element is deployed at the contracting place of the dedicated DNN; the transceiver unit is also used to receive the target DNAI set from the second session management network element, the target DNAI set includes the DNAI corresponding to the session identifier Intersection with DNAI supported by the first session management network element.
  • the acquisition unit includes the transceiver unit and the processing unit.
  • the transceiver unit is also used to send the session identifier to the second session management network element.
  • the second session management unit The network element is deployed at the contracting place of the dedicated DNN; the transceiver unit is also used to receive the DNAI corresponding to the session identifier from the second session management network element; the processing unit is used to determine that the target DNAI set includes the session identifier corresponding to The intersection of DNAI and DNAI supported by the first session management network element.
  • the transceiver unit is also used to receive messages from the second conference.
  • the instruction information of the session management network element is used to instruct the target user plane network element to allocate an IP address to the terminal device.
  • the target user plane network element is based on the DNAI corresponding to the session identifier and the first session management network element.
  • the processing unit is also configured to determine, based on the indication information and the target DNAI set, at least one target user plane network element that supports at least one target DNAI in the target DNAI set; the processing unit is also The transceiver unit is configured to determine, based on the access location information, that the first user plane network element is at least one target user plane network element whose service area includes the access location in the target user plane network element; the transceiver unit is also configured to send a message to the target user plane network element. The first user plane network element sends the request message.
  • the processing unit is also configured to determine, based on the access location information, that the first user plane network element is the target user plane network element whose service area includes the access location in at least one of the target user plane network elements. , it can be understood that the processing unit is further configured to determine the first user plane network element from the at least one target user plane network element according to the access location information, and the first user plane network element The service area of the element includes the access location.
  • the transceiver unit is also used to send the IP address to the second session management network element; the transceiver unit is also used to send the IP address to the terminal through the access management network element.
  • the device sends this IP address.
  • a communication device in a sixth aspect, includes a transceiver unit configured to receive a session identifier from a first session management network element and a DNAI supported by the first session management network element.
  • the session identifier is In order to identify the session that the terminal device requests to activate, the communication device is deployed at the signing place of the dedicated DNN contracted by the terminal device, and the first session management network element is deployed outside the signing place; the transceiver unit is also used to send messages to the first The session management network element sends a target DNAI set corresponding to the session identifier.
  • the target DNAI set includes the intersection of the DNAI corresponding to the session identifier and the DNAI supported by the first session management network element; the transceiver unit is also used to receive data from the first session management network element.
  • the first user plane network element supports at least one target DNAI in the target DNAI set, and the The service area of the first user plane network element includes the access location of the terminal device, and the access location of the terminal device is outside the contracted location.
  • the transceiver unit is further configured to send indication information to the first session management network element, where the indication information is used to indicate that the target user plane network element is the terminal device. Allocate an IP address.
  • the target user plane network element is selected based on the intersection of the DNAI corresponding to the session identifier and the DNAI supported by the first session management network element.
  • the first user plane network element is at least one of the target user plane network elements.
  • the medium service area includes the target user plane network element at the access location.
  • the transceiver unit is also used to send the IP address to a second user plane network element, and the second user plane network element is deployed at the contracting location of the dedicated DNN, The second user plane network element is used to establish the session for the terminal device according to the IP address.
  • a communication device in a seventh aspect, includes a transceiver unit.
  • the transceiver unit is used to receive a session identifier from the first session management network element.
  • the session identifier is used to identify the session that the terminal device requests to activate.
  • the communication device is deployed at the signing place of the dedicated DNN contracted by the terminal device, and the first session management network element is deployed outside the signing place; the transceiver unit is also used to send the session identifier corresponding to the first session management network element to the first session management network element.
  • DNAI the transceiver unit is also used to receive the IP address of the terminal device from the first session management network element. The IP address is allocated by the first user plane network element to the terminal device.
  • the first user plane network element supports The session identifier corresponds to at least one target DNAI in the target DNAI set, and the service area of the first user plane network element includes the access location of the terminal device.
  • the target DNAI set includes the DNAI corresponding to the session identifier and the first The intersection of DNAI supported by the session management network element, and the access location of the terminal device is outside the contracted area.
  • the transceiver unit is also used to provide information to the first session management
  • the network element sends instruction information, which is used to instruct the target user plane network element to allocate an IP address to the terminal device.
  • the target user plane network element is based on the DNAI corresponding to the session identifier and the DNAI supported by the first session management network element.
  • the first user plane network element is selected from the intersection of at least one target user plane network element whose service area includes the access location.
  • the transceiver unit is also used to send the IP address to a second user plane network element, and the second user plane network element is deployed at the contracting location of the dedicated DNN, The second user plane network element is used to establish the session for the terminal device according to the IP address.
  • a communication device in an eighth aspect, includes a transceiver unit and a processing unit.
  • the transceiver unit is used to receive the IP address of the terminal device from the session management network element.
  • the IP address is the first user plane network element.
  • the first user plane network element allocated by the terminal device supports at least one target DNAI in the target DNAI set corresponding to the session identifier, and the service area of the first user plane network element includes the access location of the terminal device, and the session
  • the identifier is used to identify the session that the terminal device requests to activate.
  • the communication device is deployed in the contracting place of the dedicated DNN contracted by the terminal device.
  • the access location of the terminal device is located outside the contracting place of the dedicated DNN; the processing unit is used to The session is established for the terminal device based on the IP address.
  • a communication device including a processor.
  • the processor is coupled to the memory and can be used to execute instructions in the memory to implement the method in the above first aspect and any possible implementation manner of the first aspect.
  • the communication device also includes a memory.
  • the communication device further includes a communication interface, and the processor is coupled to the communication interface.
  • the communication device is a first session management network element.
  • the communication interface may be a transceiver or an input/output interface.
  • the communication device is a chip configured in the first session management network element.
  • the communication interface may be an input/output interface.
  • the transceiver can be a transceiver circuit.
  • the input/output interface can be an input/output circuit.
  • a communication device including a processor.
  • the processor is coupled to the memory and can be used to execute instructions in the memory to implement the above second aspect and the method in any of the possible implementation methods of the second aspect, or to implement any of the above third aspect and the third aspect. Methods in possible implementations.
  • the communication device also includes a memory.
  • the communication device further includes a communication interface, and the processor is coupled to the communication interface.
  • the communication device is a second session management network element.
  • the communication interface may be a transceiver or an input/output interface.
  • the communication device is a chip configured in the second session management network element.
  • the communication interface may be an input/output interface.
  • a communication device including a processor.
  • the processor is coupled to the memory and can be used to execute instructions in the memory to implement the method in the fourth aspect.
  • the communication device also includes a memory.
  • the communication device further includes a communication interface, and the processor is coupled to the communication interface.
  • the communication device is a second user plane network element.
  • the communication interface may be a transceiver or an input/output interface.
  • the communication device is a chip configured in the second user plane network element.
  • the communication interface may be an input/output interface.
  • a processor including: an input circuit, an output circuit and a processing circuit. Said processing The circuit is configured to receive a signal through the input circuit and transmit a signal through the output circuit, so that the processor performs the method in any one of the possible implementations of the first to fourth aspects.
  • the above-mentioned processor can be one or more chips
  • the input circuit can be an input pin
  • the output circuit can be an output pin
  • the processing circuit can be a transistor, a gate circuit, a flip-flop and various logic circuits, etc.
  • the input signal received by the input circuit may be received and input by, for example, but not limited to, the receiver, and the signal output by the output circuit may be, for example, but not limited to, output to and transmitted by the transmitter, and the input circuit and the output A circuit may be the same circuit that functions as an input circuit and an output circuit at different times.
  • the embodiments of this application do not limit the specific implementation methods of the processor and various circuits.
  • a processing device including a processor and a memory.
  • the processor is used to read instructions stored in the memory, and can receive signals through a receiver and transmit signals through a transmitter to execute the method in any possible implementation manner of the first to fourth aspects.
  • processors there are one or more processors and one or more memories.
  • the memory may be integrated with the processor, or the memory may be provided separately from the processor.
  • the memory can be a non-transitory memory, such as a read-only memory (ROM), which can be integrated on the same chip as the processor, or can be set in different On the chip, the embodiment of the present application does not limit the type of memory and the arrangement of the memory and the processor.
  • ROM read-only memory
  • a related data interaction process such as sending a request message, may be a process of outputting a request message from the processor, and receiving a request message may be a process of the processor receiving an input request message.
  • the data output by the processor can be output to the transmitter, and the input data received by the processor can be from the receiver.
  • the transmitter and receiver can be collectively called a transceiver.
  • the processing device in the above thirteenth aspect may be one or more chips.
  • the processor in the processing device can be implemented by hardware or software.
  • the processor can be a logic circuit, an integrated circuit, etc.;
  • the processor can be a general processor, which is implemented by reading software codes stored in a memory, and the memory can Integrated in the processor, it can be located outside the processor and exist independently.
  • a computer program product includes: a computer program (which may also be called a code, or an instruction).
  • a computer program which may also be called a code, or an instruction.
  • the computer program When the computer program is run, it causes the computer to execute the above-mentioned first aspect to A method in any possible implementation manner of the fourth aspect.
  • a computer-readable storage medium stores a computer program (which may also be called a code, or an instruction) that when run on a computer enables the above-mentioned first aspect to The method in any possible implementation manner of the fourth aspect is executed.
  • a computer program which may also be called a code, or an instruction
  • a communication system including the aforementioned first session management network element and a first user plane network element, the first session management network element being used to perform any one of the above-mentioned first aspect and the first aspect. possible implementation methods.
  • the communication system also includes the aforementioned second session management network element, which is used to perform the method in any of the above second aspects and possible implementations of the second aspect, or, use In executing the method in any of the above third aspect and possible implementation manner of the third aspect.
  • the communication system further includes the aforementioned second user plane network element, which is used to perform the method in the fourth aspect.
  • Figure 1 is a schematic diagram of a communication system suitable for the method provided by the embodiment of the present application.
  • Figure 2 is a schematic flow chart of the method provided by the embodiment of the present application.
  • Figure 3 is a schematic flow chart of the method provided by the embodiment of the present application.
  • Figure 4 is a schematic flow chart of the method provided by the embodiment of the present application.
  • Figure 5 is a schematic flow chart of the method provided by the embodiment of the present application.
  • Figure 6 is a schematic diagram of a communication device provided by an embodiment of the present application.
  • Figure 7 is a schematic block diagram of a communication device provided by another embodiment of the present application.
  • FIG. 8 is a schematic diagram of a chip system provided by an embodiment of the present application.
  • the technical solutions of the embodiments of this application can be applied to various communication systems, such as: long term evolution (LTE) system, frequency division duplex (FDD) system, time division duplex (TDD) ) system, global interoperability for microwave access (WiMAX) communication system, fifth generation (5th generation, 5G) system or new radio (new radio, NR), sixth generation (6th generation, 6G) system or future communication systems, etc.
  • LTE long term evolution
  • FDD frequency division duplex
  • TDD time division duplex
  • WiMAX global interoperability for microwave access
  • 5G mobile communication system described in this application includes a non-standalone (NSA) 5G mobile communication system or a standalone (SA) 5G mobile communication system.
  • the communication system can also be a public land mobile network (PLMN), a device to device (D2D) communication system, a machine to machine (M2M) communication system, the Internet of things (Internet of things) , IoT) communication system, vehicle to everything (V2X) communication system, unmanned aerial vehicle (UAV) communication system or other communication systems.
  • PLMN public land mobile network
  • D2D device to device
  • M2M machine to machine
  • IoT Internet of things
  • V2X vehicle to everything
  • UAV unmanned aerial vehicle
  • At least one of the following or similar expressions thereof refers to any combination of these items, including any combination of a single item (items) or a plurality of items (items).
  • at least one of a, b, or c can represent: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, c can be single or multiple.
  • words such as “first” and “second” are used to distinguish the same or similar items with basically the same functions and effects.
  • words such as “first” and “second” do not limit the number and execution order, and words such as “first” and “second” do not limit the number and execution order.
  • words such as “exemplary” or “for example” are used to represent examples, illustrations or explanations. Any embodiment or technical solution described as “exemplary” or “such as” in the embodiments of the present application shall not be construed as being preferred or advantageous over other embodiments or technical solutions. Rather, the use of words such as “exemplary” or “such as” is intended to present related concepts in a concrete manner that is easier to understand.
  • Figure 1 shows a schematic diagram of a communication system suitable for the method provided by the embodiment of the present application. As shown in (a) in Figure 1, the communication system includes:
  • Terminal equipment It can be called user equipment (UE). It is a device that provides voice/data connectivity to users, such as handheld devices with wireless connection functions, vehicle-mounted devices, etc.
  • devices can be: mobile phones, tablets (pads), computers with wireless transceiver functions (such as laptops, handheld computers, etc.), mobile internet devices (mobile internet devices, MID), virtual reality (virtual reality) , VR) equipment, augmented reality (AR) equipment, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical, intelligent Wireless terminals in smart grid, wireless terminals in transportation safety, wireless terminals in smart city, wireless terminals in smart home, cellular phones, cordless phones, conversations Session initiation protocol (SIP) telephone, wireless local loop (WLL) station, personal digital assistant (PDA), handheld device with wireless communication capabilities, computing device or connected to a wireless modem
  • SIP Session initiation protocol
  • WLL wireless local loop
  • PDA personal digital assistant
  • Access network equipment Provides network access functions for authorized users in specific areas, and can use transmission tunnels of different qualities according to user levels, business needs, etc.
  • Current access network technologies include: wireless access network technology used in third generation (3G) systems, wireless access network technology used in fourth generation (4G) systems, or next-generation wireless Access network (next generation radio access network, NG-RAN) technology (such as the wireless access technology used in 5G systems, etc.).
  • Radio access network equipment that implements access network functions based on wireless communication technology can be called radio access network (radio access network, RAN) equipment.
  • Wireless access network equipment can manage wireless resources, provide access services to terminal equipment, and then complete the forwarding of control signals and user data between terminal equipment and the core network.
  • the radio access network equipment may be, for example, a base station (NodeB), an evolutionary base station (eNB or eNodeB), a next generation base station node (next generation Node base station, gNB) in a 5G mobile communication system, or a next generation Node base station (gNB) in a future mobile communication system.
  • the base station or the access point (AP) in the wifi wireless hotspot system, etc. can also be the wireless controller in the cloud wireless access network (cloud radio access network, CRAN) scenario, or the wireless access network equipment It can be relay stations, access points, vehicle-mounted equipment, drones, wearable devices, network equipment in 5G networks or network equipment in evolved PLMN, etc.
  • the embodiments of this application do not limit the specific technology and specific equipment form used by the wireless access network equipment.
  • Access management network element Mainly used for mobility management and access management, responsible for transmitting user policies between terminal equipment and policy control function (PCF) network elements, etc., and can be used to implement mobility management entities (mobile management entity, MME) functions other than session management. For example, access authorization (authentication) function.
  • PCF policy control function
  • the access management network element may be an access and mobility management function (AMF) network element.
  • AMF access and mobility management function
  • the access management network element can be an AMF network Yuan, or it can also have other names, which are not limited in this application.
  • Session management network element Mainly used for session management, allocation and management of Internet Protocol (IP) addresses of user equipment, selection of endpoints for manageable user plane functions, policy control and charging function interfaces, and downlink data communication wait.
  • IP Internet Protocol
  • the session management network element may be a session management function (SMF) network element.
  • SMF session management function
  • the session management network element may be an SMF network element, or may have other names, which are not limited in this application.
  • the communication system may include a home SMF (H-SMF) and an intermediate SMF (intermediate SMF, I-SMF).
  • H-SMF is used to provide services for terminal equipment at the home location of the terminal equipment
  • I-SMF is used to provide services for terminal equipment at the visited location of the terminal equipment.
  • DNN dedicated data network name
  • H-SMF is used to provide services to the terminal device at the signing place of the dedicated DNN.
  • SA service area
  • User plane network element used for packet routing and forwarding, quality of services (QoS) processing of user plane data, completing user plane data forwarding, session/flow level-based billing statistics, bandwidth limitation functions, etc.
  • QoS quality of services
  • the user plane network element may be a user plane function (UPF) network element.
  • user plane network elements may be UPF network elements, or may have other names, which are not limited in this application.
  • User plane network elements can be divided into session anchor user plane network elements (protocol data unit (PDU) session anchor (PDU session anchor, PSA) 1 and PSA2 in Figure 1), intermediate user plane network elements (Intermediate UPF (I-UPF) in (b) of Figure 1), uplink classifier (ULCL) user plane network element, and branching point (branching point, BP) user plane network element.
  • PDU protocol data unit
  • I-UPF Intermediate UPF
  • ULCL uplink classifier
  • BP branching point
  • the communication system includes ULCL and PSA2.
  • the communication system also includes PSA1.
  • ULCL and PSA1 can be co-located, or ULCL and PSA1 can be deployed independently.
  • Figure 1 Take the independent deployment of ULCL and PSA1 as an example. Among them, ULCL and PSA2 provide the user plane path for the UE to access data network (DN) 2, and ULCL and PSA1 provide the user plane path for the UE to access DN1.
  • DN data network
  • the communication system includes I-UPF and PSA2.
  • the communication system also includes ULCL and PSA1.
  • I-UPF, ULCL and PSA1 can be co-located, or I-UPF, ULCL and PSA1 can be deployed independently.
  • (b) in Figure 1 shows I-UPF and ULCL. Jointly deployed, PSA1 is deployed independently as an example. Among them, I-UPF and PSA2 provide the user plane path for the UE to access DN2, and ULCL and PSA1 provide the user plane path for the UE to access DN1.
  • Data network element used to provide a network for transmitting data.
  • the data network element may be a DN network element.
  • data network elements may be DN network elements, or may have other names, which are not limited in this application.
  • Policy control network element used to guide network behavior through a unified policy framework and provide policy rule information for control plane functional network elements (such as AMF, SMF network elements, etc.).
  • the policy control network element may be a policy and charging rules function (PCRF) network element.
  • the policy control network element may be a policy control function (PCF) network element.
  • PCF policy control function
  • future communication systems the policy control network element may be a PCF network element, or may have other names, which are not limited in this application.
  • N1, N2, N3, N4, N6, N7, N9, N11, N14, N15 and N16a in Figure 1 are interface serial numbers.
  • the meaning of these interface serial numbers can be found in the meaning defined by the 3rd generation partnership project (3GPP) technical standards (TS) 23.501.
  • AMF, SMF, UPF, PCF, etc. shown in Figure 1 can be understood as network elements used to implement different functions in the core network, and can, for example, be combined into network slices as needed. These core network elements may be independent devices, or may be integrated into the same device to implement different functions. This application does not limit the specific forms of the above network elements.
  • the control plane network element such as SMF
  • user plane network element such as UPF
  • the dedicated DNN contract area allocates an IP address to the terminal device.
  • the terminal device moves from the dedicated DNN contracting place to the visiting location (outside the dedicated DNN contracting place)
  • the terminal device uses the IP address assigned by the control plane network element or user plane network element in the dedicated DNN contracting area to access the network, then Operators cannot implement region-based service management based on this IP address.
  • embodiments of the present application provide a method of allocating IP addresses to allocate IP addresses to terminal devices based on the IP address pool planned at the visited location.
  • the terminal device has signed a contract with the dedicated DNN, and the terminal device is located outside the contracting place of the dedicated DNN.
  • the terminal equipment is located outside the dedicated DNN contracting area: Case 1.
  • the terminal equipment is located within the service area of the session management network element within the dedicated DNN contracting area, and is located within the service area of the user plane network element within the dedicated DNN contracting area. Outside; case 2, the terminal equipment is located outside the service area of the session management network element in the dedicated DNN contract area, and is located outside the service area of the user plane network element in the dedicated DNN contract area.
  • Figure 2 shows a schematic flow chart of a method 200 for allocating IP addresses provided by an embodiment of the present application.
  • the method 200 may include the following steps:
  • the first session management network element obtains the target data network access identifier (DNAI) set corresponding to the session identifier #1 and the access location information of the terminal device.
  • DNAI target data network access identifier
  • the first session management network element is deployed in the dedicated DNN contracted by the terminal device (hereinafter referred to as DNN#1) contracting area, and the first session management network element is used to provide terminal equipment contracted with DNN#1 in the DNN#1 contracting area.
  • the contracting place of DNN#1 refers to the service area of the DN corresponding to DNN#1, or refers to the service area of the core network element that provides services for the terminal equipment contracted with DNN#1, for example, the contracting place of DNN#1 refers to the service area of the user plane network element that provides services for the terminal equipment signed with DNN#1, or the service area of the session management network element that provides services for the terminal equipment signed with DNN#1.
  • the contracting place of DNN#1 is city A or region A.
  • the access location information of the terminal equipment includes the cell identifier (cell identifier) accessed by the terminal equipment and/or the terminal equipment access location information.
  • the tracking area identifier (TAI) of the device is used to identify the tracking area (TAI) of the terminal device.
  • the first session management network element may obtain the access location information of the terminal device from the access management network element. For example, after receiving the session identifier #1 from the terminal device, the access management network element carries the session identifier #1 and the access location information of the terminal device in a message and sends it to the first session management network element. For another example, after receiving the session identifier #1, the first session management network element requests access location information of the terminal device from the access management network element; accordingly, the access management network element requests the access location information of the terminal device according to the request of the first session management network element. The first session management network element sends the access location information of the terminal device.
  • Session ID #1 is the session ID of the terminal device, and is used to identify session #1 that the terminal device requests to activate.
  • session identifier #1 includes at least one of the following: DNN#1 or single network slice selection assistance information (single network slice selection assistance information, S-NSSAI) #1, and S-NSSAI#1 corresponds to DNN#1.
  • S-NSSAI single network slice selection assistance information
  • S-NSSAI#1 single network slice selection assistance information
  • the session #1 requested to be activated by the terminal device is a session for accessing the DN where DNN#1 is contracted.
  • the session identifier #1 is received by the first session management network element from the terminal device through the access management network element.
  • the terminal device sends a PDU session establishment request (PDU session establishment request) message to the access management network element, and the PDU session establishment request message includes session identification #1.
  • the access management network element initiates an SMF serviced interface_PDU session_create session management (session management, SM) context request (Nsmf_PDUSession_CreatSMContext Request) service to the first session management network element according to the PDU session establishment request message, and the SMF serviced Interface_PDU Session_Create Session Management Context Request Service includes session ID #1.
  • the set of target DNAIs corresponding to session ID #1 includes one or more target DNAIs.
  • the one or more target DNAIs are used to select the first user plane network element that provides services for the terminal device.
  • the one or more target DNAIs are DNAIs corresponding to session ID #1.
  • the embodiment of the present application does not limit the manner in which the first session management network element obtains the target DNAI set corresponding to the session identifier #1.
  • a target DNAI set corresponding to session identifier #1 is preconfigured in the first session management network element.
  • the first session management network element is pre-configured with the corresponding relationship #1.
  • the corresponding relationship #1 is the corresponding relationship between different session identifiers and different DNAIs. Then the first session management network element receives the session identifier # from the terminal device. 1, the target DNAI set is determined based on the session identifier #1 and the correspondence relationship #1, and the target DNAI set includes the DNAI corresponding to the session identifier #1 in the correspondence relationship #1.
  • the preconfigured correspondence relationship #1 in the first session management network element is as shown in Table 1. If the session identifier #1 received by the first session management network element includes DNN#1, the first session management network element determines the session identifier The target DNAI set corresponding to #1 includes DNAI#1 and DNAI#2 corresponding to DNN#1.
  • the first session management network element is pre-configured with correspondence #2 and correspondence #3.
  • Correspondence #2 is the correspondence between different DNNs and different DNAIs
  • correspondence #3 is the correspondence between different S-NSSAI and different DNN correspondence relation. If the session identifier #1 received by the first session management network element includes DNN#1, the first session management network element determines the target DNAI set based on DNN#1 and correspondence relationship #2, and the target DNAI set includes the DNN in correspondence relationship #2 DNAI corresponding to #1.
  • the first session management network element first determines the DNN corresponding to S-NSSAI#1 based on the correspondence relationship #3, For example, it is DNN#1, and then the target DNAI set is determined based on DNN#1 and correspondence relationship #2.
  • the target DNAI set includes the DNAI corresponding to DNN#1 in correspondence relationship #2.
  • the first session management network element obtains the target DNAI set corresponding to the session identifier #1 from the policy control network element.
  • the step of the first session management network element obtaining the target DNAI set may include S211a and S212a.
  • the first session management network element sends the session identifier #1 to the policy control network element.
  • the policy control network element is deployed in the contracting area of DNN#1, and the policy control network element can communicate with the first session management network element deployed in the contracting area of DNN#1.
  • the first session management network element sends session identification #1 to the policy control network element through the PCF serviced interface_session management policy control_create request (Npcf_SMPolicyControl_Create Request) service.
  • the policy control network element sends the target DNAI set to the first session management network element.
  • the policy control network element After receiving the session identifier #1, the policy control network element determines that the target DNAI set corresponding to the session identifier #1 includes the DNAI corresponding to the session identifier #1, and sends the target DNAI set corresponding to the session identifier #1 to the first session management network element .
  • the policy control network element sends the target DNAI set to the first session management network element through the PCF serviced interface_session management policy control_create response (Npcf_SMPolicyControl_Create Response) service.
  • the first session management network element may determine the target DNAI set corresponding to the session identifier #1 based on the offloading policy of the subscribed service and local configuration information.
  • the step of obtaining the target DNAI set by the first session management network element may include S211b to S213b.
  • S211b The first session management network element sends session identification #1 to the policy control network element.
  • S211b may refer to the description of S211a.
  • S212b The policy control network element sends the offloading policy of the subscription service to the first session management network element.
  • the contracted service is a service that the terminal device accesses through session #1 identified by session identifier #1.
  • the offloading policy of the contracted service includes the business information of the contracted service.
  • the service information includes the fully qualified domain name (FQDN) of the service and the service name of the service.
  • IP five-tuple description information, etc. IP five-tuple description information can be: source IP address (source IP address), destination IP address (destination IP address), source port number (sourceport number), destination port number (destination port number) and protocol type.
  • the policy control network element After receiving the session identifier #1, the policy control network element sends the offloading policy of the subscription service to the first session management network element.
  • the offloading strategy please refer to the description in S212a above.
  • the policy control network element sends the offloading policy of the subscription service to the first session management network element through the PCF service interface_session management policy control_create response service.
  • S213b The first session management network element determines the target DNAI set.
  • the first session management network element After receiving the offloading policy of the contracted service, the first session management network element determines the target DNAI set corresponding to the session identifier #1 according to the offloading policy, and the target DNAI set includes the DNAI corresponding to the offloading policy.
  • the local configuration information includes correspondence #4
  • correspondence #4 is a correspondence between different traffic distribution policies and different DNAIs.
  • the management network element After receiving the offloading policy of the contracted service, the management network element determines the target DNAI set according to the offloading policy and correspondence relationship #4.
  • the target DNAI set includes the DNAI corresponding to the offloading policy in correspondence relationship #4.
  • the first session management network element sends a request message to the first user plane network element.
  • the first user plane network element receives the request message from the first session management network element.
  • the first user plane network element supports at least one target DNAI in the target DNAI set corresponding to the session identifier #1, and the service area of the first user plane network element includes the access location of the terminal device.
  • the first user plane network element may also be called the main anchor user plane network element.
  • the request message is used to request the assignment of an IP address to the terminal device.
  • the request message may be a PDU session establishment request (PDU session establishment request) message.
  • the request message may include at least one target DNAI supported by the first user plane network element.
  • the first session management network element After the first session management network element obtains the target DNAI set corresponding to the session identifier #1 and the access location information of the terminal device, it obtains the target DNAI set corresponding to the session identifier #1 and the access location information of the terminal device from the first session.
  • the management network element selects a first user plane network element among multiple user plane network elements managed by the management network element, and then sends a request message to the first user plane network element.
  • the target DNAI set corresponding to session identifier #1 includes DNAI#1 and DNAI#2
  • the access location information of the terminal device includes the TAI of the terminal device
  • the first user plane network element supports DNAI#1 and/or DNAI#2
  • the service area includes the TA identified by TAI.
  • each user plane network element in the multiple selectable user plane network elements can select one of multiple alternative user plane network elements.
  • Any user plane network element serves as the first user plane network element.
  • the user plane network element #1 managed by the first session management network element supports DNAI #1, and the service area includes the TA of the terminal device.
  • the first session management network element If user plane network element #2 of element management supports DANI #2, and the service area includes the TA of the terminal device, then the first session management network element can use user plane network element #1 or user plane network element #2 as the first user plane network element. Alternatively, the first session management network element selects the user plane network element with the lowest load among the plurality of available user plane network elements as the first user plane network element. For example, in the above example, user plane network element #1 is the user plane network element with the lowest load among user plane network element #1 and user plane network element #2, then the first session management network element selects user plane network element #1 as the user plane network element. The first user plane network element.
  • the first session management network element requests the IP address of the terminal device from the first user plane network element according to the predefined rules of the protocol. That is, the first session management network element obtains the IP address from the managed device according to the predefined rules of the protocol. After selecting the first user plane network element among the plurality of user plane network elements, a request message is sent to the first user plane network element to request the first user plane network element to allocate an IP address to the terminal device.
  • the first session management network element determines to request the IP address of the terminal device from the first user plane network element according to the instruction information #1, and the instruction information #1 is used to instruct the target user plane network element to The terminal device allocates an IP address, and the target user plane network element is selected by the first session management network element based on DNAI. For example, DNAI corresponding to indication information #1 is preconfigured in the first session management network element.
  • the A session management network element is determined based on the instruction information #1, and the target user plane network element allocates an IP address to the terminal device.
  • the target user plane network element is selected by the first session management network element based on DNAI#1 and/or DNAI#2.
  • the first session management network element determines at least one target user plane network element that supports DNAI#1 and/or DNAI#2 according to the instruction information #1, and then configures the service area of the at least one target user plane network element to include the interface of the terminal device.
  • the first user plane network element is requested to allocate an IP address to the terminal device.
  • the first session management network element receives indication information #1 from the policy control network element. For example, when the policy control network element sends the target DNAI set corresponding to the session identifier #1 to the first session management network element, the target DNAI set corresponding to the session identifier #1 and the instruction information #1 are carried in a message and sent to the first session. Manage network elements. For example, if the policy control network element determines that the target DNAI set corresponding to the session identifier #1 corresponds to the indication information #1, the policy control network element sends the indication information #1 to the first session management network element.
  • the first session management network element After receiving the instruction information #1 from the policy control network element, the first session management network element determines according to the instruction information #1 that the target user plane network element allocates an IP address to the terminal device. The target user plane network element is selected based on the target DNAI set. of. Furthermore, the first session management network element determines at least one target user plane network element that supports at least one target DNAI in the target DNAI set according to the instruction information #1, and then configures the service area of the at least one target user plane network element to include the interface of the terminal device. After the target user plane network element in the location is determined to be the first user plane network element, the first user plane network element is requested to allocate an IP address to the terminal device.
  • the first session management network element determines that the target user plane network element is the first user plane network element from the at least one target user plane network element, and the first session management network element determines that the target user plane network element is the first user plane network element.
  • the service area of a user plane network element includes the access location.
  • the first session management network element can request the first user plane network element to allocate an IP address to the terminal device.
  • the first session management network element determines that the terminal device is located outside the service area of the user plane network element in the DNN#1 contract area
  • the first session management network element determines to send the first user plane network to the first user plane network element.
  • the user plane network elements in the contract area of DNN#1 are used to provide services for the terminal equipment contracted with DNN#1 in the contract area of DNN#1.
  • the first session management network element receives the IP address from the first user plane network element.
  • the first user plane network element sends the IP address to the first session management network element.
  • the first user plane network element After receiving the request message from the first session management network element, the first user plane network element allocates an IP address to the terminal device according to the request message and sends the allocated IP address to the first session management network element. Exemplarily, the first user plane network element sends the IP address to the first session management network element through a PDU session establishment response (PDU session establishment response) message.
  • PDU session establishment response PDU session establishment response
  • method 200 also includes S240 and S250.
  • S240 The first session management network element sends the IP address to the second user plane network element.
  • the second user plane network element can establish session #1 for the terminal device based on the IP address of the terminal device in the second user plane network element.
  • Transmission channel between access network equipment For more description of the transmission channel between the second user plane network element and the access network device to establish session #1 for the terminal device, please refer to S414 in the method 400 below.
  • the second user plane network element is deployed in the DNN#1 contract area, that is, the first session management network element selects the user plane network element corresponding to DNN#1 from the multiple user plane network elements it manages as the second user plane network element. Yuan.
  • the second user plane network element may be called a secondary anchor user plane network element.
  • the first session management network element sends the IP address of the terminal device to the second user plane network element through a PDU session establishment request message.
  • the second user plane network element can send a PDU session establishment response (PDU session establishment response) message to the first session management network element.
  • the first session management network element sends the IP address to the terminal device.
  • the terminal device receives the IP address from the first session management network element.
  • the terminal device After receiving the IP address, the terminal device establishes a transmission channel for Session #1 between the terminal device and the access network device based on the IP address.
  • the first session management network element sends an IP address to the terminal device through the access management network element.
  • the first session management network element sends an AMF serviced interface_communication_N1N2 message transfer (Namf_Communication_N1N2MessageTransfer) message to the access management network element.
  • the AMF The service interface_communication_N1N2 message forwarding message includes the PDU session establishment accept message, and the PDU session establishment accept message includes the IP address of the terminal device.
  • the access management network element sends the PDU session establishment acceptance message to the terminal device.
  • the first session management network element requests the first user plane network element to allocate an IP address to the terminal device. Since the first user plane network element covers the access location of the terminal device, the IP address allocated by the first user plane network element to the terminal device is related to the access location of the terminal device, which can realize an IP address pool based on visited location planning. Allocate IP addresses to terminal devices, thereby meeting the operator's needs for region-based service management based on IP addresses.
  • the following describes the method of allocating IP addresses provided by the embodiment of the present application by taking the above situation 2 as an example with reference to FIG. 3 .
  • FIG. 3 shows a schematic flowchart of a method 300 for allocating an IP address provided by an embodiment of the present application.
  • the method 300 may include the following steps:
  • the first session management network element obtains the target DNAI set corresponding to the session identifier #1 and the access location information of the terminal device.
  • the first session management network element is deployed outside the contracted location of DNN#1, and the first session management network element may be called an intermediate session management network element.
  • the contracting place of DNN#1 and session identifier #1 please refer to S210 in the method 200 above.
  • the set of target DNAIs corresponding to session ID #1 includes one or more target DNAIs.
  • the one or more target DNAIs are used to select the first user plane network element that provides services for the terminal device.
  • the one or more target DNAIs are the intersection of the DNAI supported by the first session management network element and the DNAI corresponding to the session identifier #1.
  • the embodiment of the present application does not limit the manner in which the first session management network element obtains the target DNAI set corresponding to the session identifier #1.
  • the step of obtaining the target DNAI set by the first session management network element may include S311a and S312a.
  • S311a The first session management network element sends the session identifier #1 and the DNAI supported by the first session management network element to the second session management network element.
  • the second session management network element is deployed in the contracting place of DNN#1, and is used to provide services for the terminal equipment contracted with DNN#1 in the contracting place of DNN#1.
  • the second session management network element may be called a home session management network element.
  • the first session management network element sends the session identifier #1 and the DNAI supported by the first session management network element to the second session management network element through the SMF serviced interface_PDU session_create request (Nsmf_PDUSession_Create Request) message.
  • SMF serviced interface_PDU session_create request Nsmf_PDUSession_Create Request
  • method 300 may also include: the first session management network element receives the The address information of the second session management network element of the network element includes the identifier of the second session management network element and/or the IP address of the second session management network element.
  • the address information of the second session management network element is determined by the access management network element based on the session identifier #1. For example, if session identifier #1 includes DNN#1, the access management network element determines the address information of the second session management network element corresponding to DNN#1 based on DNN#1, that is, determines the third session management network element within the contracted area of DNN#1. 2. Address information of the session management network element.
  • session identifier #1 includes S-NSSAI#1 but does not include DNN#1
  • the access management network element first determines the DNN#1 corresponding to S-NSSAI#1, and then determines the second session corresponding to DNN#1. Manage the address information of network elements.
  • the first session management network element receives the target DNAI set from the second session management network element.
  • the target DNAI set corresponding to the session identifier #1 includes the intersection of the DNAI corresponding to the session identifier #1 and the DNAI supported by the first session management network element. That is to say, after receiving the session identifier #1 and the DNAI supported by the first session management network element, the second session management network element first determines the DNAI corresponding to the session identifier #1 based on the session identifier #1, and then determines the DNAI corresponding to the session identifier #1. The target DNAI set includes the intersection of the DNAI corresponding to session ID #1 and the DNAI supported by the first session management network element. Finally, the second session management network element sends the target DNAI set corresponding to session ID #1 to the first Session management network element.
  • the method for the second session management network element to obtain the DNAI corresponding to the session identifier #1 may refer to the description of the method for the first session management network element to obtain the target DNAI set in method 200 above.
  • method 300 also includes: the second session management network element sends instruction information #1 to the first session management network element.
  • the instruction information #1 is used to instruct the target user plane network element to allocate an IP address to the terminal device.
  • the target user The plane network element is selected by the first session management network element based on the intersection of the DNAI corresponding to session identifier #1 and the DNAI supported by the first session management network element. In other words, the target user plane network element is selected by the first session management network element based on the target DNAI. Collection selected.
  • the second session management network element when the second session management network element sends the target DNAI set corresponding to the session identifier #1 to the first session management network element, the second session management network element carries the target DNAI set corresponding to the session identifier #1 and the instruction information #1 in a message and sends it to the first session management network element.
  • a session management network element For example, if the second session management network element determines that the target DNAI set corresponding to the session identifier #1 corresponds to the indication information #1, the second session management network element sends the indication information #1 to the first session management network element.
  • the second session management network element sends the target DNAI set corresponding to the session identifier #1 to the first session management network element through the SMF serviced interface_PDU session_create response (Nsmf_PDUSession_Create Response) message.
  • SMF serviced interface_PDU session_create response Nsmf_PDUSession_Create Response
  • the step of obtaining the target DNAI set by the first session management network element may include S311b to S313b.
  • S311b The first session management network element sends the session identifier #1 to the second session management network element.
  • the first session management network element may send the session identifier #1 to the second session management network element through the SMF serviced interface_PDU session_create request message.
  • method 300 may also include: the first session management network element receiving address information from the second session management network element that accesses the management network element.
  • the first session management network element receives the DNAI corresponding to the session identifier #1 from the second session management network element.
  • the second session management network element sends the DNAI corresponding to the session identifier #1 to the first session management network element through the SMF serviced interface_PDU session_create response message.
  • the method for the second session management network element to obtain the DNAI corresponding to the session identifier #1 may refer to the description of the method for the first session management network element to obtain the target DNAI set in method 200 above.
  • method 300 also includes: the second session management network element sends instruction information #1 to the first session management network element.
  • the instruction information #1 is used to instruct the target user plane network element to allocate an IP address to the terminal device.
  • the target user The plane network element is selected by the first session management network element based on the intersection of the DNAI corresponding to session identifier #1 and the DNAI supported by the first session management network element. In other words, the target user plane network element is selected by the first session management network element based on the target DNAI. Collection selected.
  • the second session management network element when the second session management network element sends the DNAI corresponding to the session identifier #1 to the first session management network element, the second session management network element carries the DNAI corresponding to the session identifier #1 and the indication information #1 in a message and sends it to the first session management network Yuan. For example, if the second session management network element determines that the DNAI corresponding to the session identifier #1 corresponds to the indication information #1, the second session management network element sends the indication information #1 to the first session management network element.
  • S313b The first session management network element determines the target DNAI set.
  • the first session management network element After the first session management network element receives the DNAI corresponding to the session identifier #1, the first session management network element determines the target DNAI set corresponding to the session identifier #1.
  • the target DNAI set includes the DNAI corresponding to the session identifier #1 and the first session management Intersection of DNAI supported by network elements.
  • S320 The first session management network element sends a request message to the first user plane network element.
  • the first user plane network element receives the request message from the first session management network element.
  • S320 please refer to the description of S220 in the method 200 above.
  • the first session management network element can determine the direction to the first user plane based on the instruction information #1.
  • the network element sends a request message. That is to say, after receiving the instruction information #1 from the second session management network element, the first session management network element determines according to the instruction information #1 that the target user plane network element allocates an IP address to the terminal device.
  • the target user plane network element It is selected based on the intersection of the DNAI corresponding to session identifier #1 and the DNAI supported by the first session management network element, or in other words, selected based on the target DNAI set.
  • the first session management network element determines at least one target user plane network element that supports at least one target DNAI in the target DNAI set according to the instruction information #1, and then configures the service area of the at least one target user plane network element to include the interface of the terminal device. After the target user plane network element in the location is determined to be the first user plane network element, the first user plane network element is requested to allocate an IP address to the terminal device.
  • the first session management network element receives the IP address from the first user plane network element.
  • the first user plane network element sends the IP address to the first session management network element.
  • method 300 also includes S340 to S360.
  • S340 The first session management network element sends the IP address to the second session management network element.
  • the first session management network element sends the SMF serviced interface_PDU session_update request (Nsmf_PDUSession_Update Request) message to the second session management network element through the N16a interface.
  • the SMF serviced interface_PDU session_update request message includes the terminal The IP address of the device.
  • S350 The second session management network element sends the IP address to the second user plane network element.
  • the second user plane network element After the second session management network element sends the IP address of the terminal device to the second user plane network element, the second user plane network element can establish session #1 between the second user plane network element and the access network device based on the IP address of the terminal device. transmission channel between them.
  • the transmission channel between the second user plane network element and the access network device for establishing session #1 for the terminal device please refer to S511 in the method 500 below.
  • the second user plane network element is deployed in the contracted area of DNN#1, that is, the first session management network element selects the user plane network element corresponding to DNN#1 from the multiple user plane network elements it manages as the second user plane network element.
  • Second user plane network element It can be called a secondary anchor user plane network element.
  • the second session management network element may send the IP address of the terminal device to the second user plane network element through a PDU session establishment request message.
  • the second user plane network element can send a PDU session establishment response message to the second session management network element.
  • S360 The first session management network element sends the IP address to the terminal device.
  • the terminal device receives the IP address from the first session management network element.
  • the terminal device After the terminal device receives the IP address, it can establish a transmission channel for session #1 between the terminal device and the access network device based on the IP address.
  • the first session management network element requests the first user plane network element to be the terminal
  • the device is assigned an IP address. Since the first user plane network element covers the access location of the terminal device, the IP address allocated by the first user plane network element to the terminal device is related to the access location of the terminal device, thus meeting the requirements of the operator to implement region-based implementation based on IP address. business management needs.
  • the UE in Figure 4 is an example of the terminal device described in Figure 2
  • the AMF is an example of the access management network element described in Figure 2
  • ULCL+PSA1 is the first user plane network described in Figure 2
  • SMF is an example of the first session management network element in Figure 2
  • PSA2 is an example of the second user plane network element in Figure 2
  • PCF is an example of the policy control network element in Figure 2.
  • Figure 4 shows a schematic flow chart of the method for allocating IP addresses provided by the embodiment of the present application.
  • the method 400 shown in Figure 4 may include the following steps:
  • the UE sends session identifier #1 to the AMF.
  • session identifier #1 may refer to S210 in method 200 above.
  • the UE sends the session identifier #1 to the AMF through the PDU session establishment request message.
  • S402 AMF sends session identifier #1 to SMF.
  • AMF sends session identifier #1 to SMF through the SMF serviced interface_PDU session_create session management context request service.
  • method 400 also includes S403 and S404.
  • SMF sends session identifier #1 to PCF.
  • SMF sends session identification #1 to PCF through the PCF serviced interface_session management policy control_create request service.
  • PCF sends the traffic offload policy to SMF.
  • the offloading policy is the offloading policy for the subscription service, and the subscription service is the service that the UE accesses through the session identified by session identifier #1.
  • the offloading strategy please refer to S210 in method 200 above.
  • the offloading policy includes the target DNAI set corresponding to session ID #1.
  • the target DNAI set please refer to S212a in the method 200 above.
  • PCF sends the offloading policy to SMF through the PCF service interface_session management policy control_create response service.
  • SMF can also send SMF service-oriented interface to AMF.
  • the SMF obtains the target DNAI set corresponding to the session identifier #1 and the access location information of the UE.
  • SMF obtains the target DNAI set corresponding to session ID #1 from the offload policy.
  • SMF determines the target DNAI set corresponding to session ID #1 based on the offloading policy and local configuration information.
  • the target DNAI set corresponding to session ID #1 is preconfigured in SMF.
  • S406 SMF sends a request message to ULCL+PSA1.
  • the request message is used to request ULCL+PSA1 to allocate an IP address to the UE.
  • the request message sent by SMF to ULCL+PSA1 is a PDU session establishment request message.
  • ULCL+PSA1 represents the network element co-located with ULCL and PSA1.
  • ULCL+PSA1 supports at least one target DNAI in the target DNAI set, and the service area of ULCL+PSA1 includes the access location of the UE.
  • ULCL+PSA1 also has the function of uplink offloading. .
  • PSA1 and ULCL can also be deployed independently.
  • SMF sends a request message to PSA1
  • PSA1 supports at least one target DNAI in the target DNAI set
  • the service area of PSA1 includes the access location of the UE.
  • ULCL+PSA1 After receiving the request message from SMF, ULCL+PSA1 allocates an IP address to the UE and sends the IP address allocated to the UE to SMF.
  • ULCL+PSA1 sends the IP address to the SMF through the PDU session establishment response message.
  • SMF sends the N3 interface address and IP address of ULCL+PSA1 to AMF.
  • SMF sends the IP address and N3 interface address of ULCL+PSA1 to AMF by sending the AMF serviced interface_communication_N1N2 message forwarding message.
  • AMF service interface_communication_N1N2 message forwarding message includes N2 session management (SM) information and N1SM container (container).
  • N2SM information includes the N3 interface address of ULCL+PSA1.
  • the N1SM container includes PDU session establishment acceptance message, PDU The session establishment accept message includes the UE's IP address.
  • SMF selects the UPF with uplink offloading function as the ULCL from multiple managed UPFs based on the UE's access location information, and sends the N3 interface address of the ULCL and the IP address.
  • the service area of the ULCL selected by the SMF according to the UE's access location information covers the UE's access location.
  • S409 AMF sends the IP address and the N3 interface address of ULCL+PSA1 to the RAN.
  • the AMF sends the IP address and the N3 interface address of ULCL+PSA1 to the RAN through a PDU session resource setup request message.
  • the PDU session resource establishment request message includes N2SM information and a non-access stratum (NAS) message.
  • the N2SM information includes the N3 interface address of ULCL+PSA1.
  • the NAS message includes an N1SM container.
  • the N1SM container PDU session establishment acceptance message the PDU session establishment accept message includes the IP address of the UE.
  • the RAN After receiving the PDU session resource establishment request message, the RAN parses the N2SM information to obtain the N3 interface address of ULCL+PSA1, and forwards the N1SM container to the UE. After RAN obtains the N3 interface address of ULCL+PSA1, it can establish an uplink N3 tunnel from RAN to ULCL+PSA1 based on the N3 interface address of ULCL+PSA1. Based on the uplink N3 tunnel, the RAN can send uplink data packets from the UE to ULCL+PSA1.
  • the RAN sends the IP address to the UE.
  • the RAN sends an access network-specific resource setup (AN-specific resource setup) message to the UE.
  • the access network-specific resource setup message includes a PDU session establishment accept message, and the PDU session establishment accept message includes the UE's IP address.
  • the UE After receiving the access network specific resource establishment message, the UE establishes a resource link with the RAN according to the access network specific resource establishment message.
  • the RAN sends the N3 interface address of the RAN to the AMF.
  • the RAN sends the N3 interface address of the RAN to the AMF through the PDU session resource establishment response (PDU session resource response) message.
  • the PDU session resource establishment response message includes an N2 container, and the N2 container includes the N3 interface address of the RAN.
  • the AMF sends the N3 interface address of the RAN to the SMF.
  • AMF sends the RAN's N3 interface address to SMF through the SMF Serviced Interface_PDU Session_Update Session Management Context Request (Nsmf_PDUSession_UpdateSMContext Request) message.
  • the SMF serviced interface_PDU session_update session management context request message includes an N2 container, and the N2 container includes the N3 interface address of the RAN.
  • SMF sends the N3 interface address of the RAN to ULCL+PSA1.
  • SMF sends the RAN's N3 interface address to ULCL+PSA1 through the PDU session modification request message.
  • ULCL+PSA1 After ULCL+PSA1 receives the N3 interface address of the RAN, it can establish a downlink N3 tunnel from ULCL+PSA1 to the RAN based on the N3 interface address of the RAN. Based on the downlink N3 tunnel, ULCL+PSA1 can send the downlink data packet sent to the UE to the RAN.
  • the SMF selects the UPF with uplink offloading function as the ULCL from the multiple managed UPFs based on the UE's access location information, and sends the RAN's N3 interface address to the ULCL.
  • ULCL+PSA1 can also send a PDU session modification response (PDU session modification response) message to the SMF.
  • PDU session modification response PDU session modification response
  • SMF sends the IP address and the N9 interface address of ULCL+PSA1 to PSA2.
  • PSA2 After PSA2 receives the N9 interface address of ULCL+PSA1, it can establish an N9 tunnel from PSA2 to ULCL+PSA1 based on the N9 interface address of ULCL+PSA1. Based on the N9 tunnel, PSA2 can send the downlink data packet sent to the UE to ULCL+PSA1.
  • SMF sends the UE's IP address and the N9 interface address of ULCL+PSA1 to PSA2 through the PDU session establishment request message.
  • PSA2 can also send a PDU session establishment response message to the SMF.
  • SMF sends the offloading rules and forwarding rules to ULCL+PSA1.
  • SMF sends offloading rules to ULCL+PSA1 based on the offloading policy received from PCF, and forwarding rules to ULCL+PSA1 based on the N9 interface address of PSA2.
  • the offloading rule is used to instruct ULCL+PSA1 to offload the contracted service.
  • the offloading rule includes the business information of the contracted service.
  • the service information includes the full domain name of the service, the IP five-tuple description information of the service, etc.
  • the IP five-tuple description information can be: source IP address, destination IP address, source port number, destination port number and protocol type.
  • the forwarding rules include the N9 interface address of PSA2, and the forwarding rules are used to instruct ULCL+PSA1 to forward uplink data packets matching the offloading rules to the N9 interface of PSA2.
  • ULCL+PSA1 After ULCL+PSA1 receives the N9 interface address of PSA2, it can establish an N9 tunnel from ULCL+PSA1 to PSA2 based on the N9 interface address of PSA2. Based on this N9 tunnel, ULCL+PSA1 can send uplink data packets matching the offloading rules to PSA2.
  • SMF sends the offloading rules and forwarding rules to ULCL+PSA1 through the PDU session modification request message.
  • ULCL+PSA1 can also send a PDU session modification response message to SMF.
  • the SMF selects the UPF with uplink offloading function as the ULCL from the multiple managed UPFs based on the UE's access location information, and sends the offloading rules and forwarding rules to the ULCL.
  • the access request can match the offloading rules of the subscription service when passing through ULCL+PSA1, and then ULCL+PSA1 forwards the access request to PSA2 through the N9 tunnel between ULCL+PSA1 and PSA2 , and then PSA2 forwards the access request to the DN of the dedicated DNN contracting place through the N6 interface of PSA2.
  • PSA2 receives a downlink data packet from the DN of the dedicated DNN contracting area, and the destination address of the downlink data packet is the IP address of the UE, PSA2 sends the downlink data packet to ULCL+PSA1 through the N9 tunnel from PSA2 to ULCL+PSA1. Then ULCL+PSA1 sends the downlink data packet to the RAN through the N3 tunnel of ULCL+PSA1 to the RAN, and the RAN sends the downlink data packet to the UE.
  • ULCL+PSA1 If the UE requests access to public network services, the access request cannot match the offloading rule when passing through ULCL+PSA1, and then ULCL+PSA1 forwards the access request to the corresponding DN of the public network through the N6 interface. If ULCL+PSA1 receives a downlink data packet from the DN corresponding to the public network, and the destination address of the downlink data packet is the IP address of the UE, ULCL+PSA1 will send the downlink data packet to the RAN through the N3 tunnel from ULCL+PSA1 to RAN. The RAN sends the downlink data packet to the UE.
  • the size of the sequence number of each process does not mean the order of execution.
  • the execution order of each process should be determined by its function and internal logic, and should not be applied to the implementation process of the embodiment of the present application. constitute any limitation.
  • the SMF requests ULCL+PSA1 to allocate an IP address to the terminal device. Since ULCL+PSA1 covers the access location of the UE, the IP address assigned by ULCL+PSA1 to the UE is related to the access location of the UE, thereby meeting the operator's needs for region-based service management based on IP addresses.
  • the UE in Figure 5 is an example of the terminal device described in Figure 3
  • the AMF is an example of the access management network element described in Figure 3
  • ULCL+PSA1 is the first user plane network described in Figure 3
  • I-SMF is the first session management network described in Figure 3
  • H-SMF is an example of the second session management network element in Figure 3
  • PSA2 is an example of the second user plane network element in Figure 3.
  • Figure 5 shows a schematic flow chart of the method for allocating IP addresses provided by the embodiment of the present application.
  • the method 500 described in Figure 5 includes the following steps:
  • the UE sends session identifier #1 to the AMF.
  • session identifier #1 may refer to S210 in method 200 above.
  • the UE sends the session identifier #1 to the AMF through the PDU session establishment request message.
  • S502 AMF sends session identifier #1 to I-SMF.
  • the AMF sends the session identifier #1 to the I-SMF through the SMF serviced interface_PDU session_create session management context request service.
  • the I-SMF selects the I-UPF based on the UE's access location and creates a session with the I-UPF.
  • I-SMF sends a PDU session establishment request message to I-UPF.
  • I-UPF sends a PDU session establishment response message to I-SMF.
  • I-SMF sends session identifier #1 and DNAI supported by I-SMF to H-SMF.
  • method 500 also includes S505 and S506.
  • H-SMF sends session identifier #1 to PCF.
  • H-SMF sends session identification #1 to PCF through the PCF serviced interface_session management policy control_create request service.
  • the offloading policy is the offloading policy for the subscription service, and the subscription service is the service that the UE accesses through the session identified by session identifier #1.
  • the offloading strategy please refer to S210 in method 200 above.
  • the offloading policy includes the DNAI corresponding to session ID #1.
  • PCF sends the offloading policy to H-SMF through the PCF service interface_session management policy control_create response service.
  • H-SMF sends the target DNAI set to I-SMF.
  • the target DNAI set is the intersection of the DNAI corresponding to session ID #1 and the DNAI supported by I-SMF.
  • H-SMF can also send indication information #1 to I-SMF.
  • I-SMF sends a request message to ULCL+PSA1.
  • the request message is used to request ULCL+PSA1 to allocate an IP address to the UE.
  • the description of ULCL+PSA1 can refer to S406 in method 400 above.
  • the request message sent by I-SMF to ULCL+PSA1 is a PDU session establishment request message.
  • PSA1 and ULCL can also be deployed independently.
  • I-SMF sends a request message to PSA1
  • PSA1 supports at least one target DNAI in the target DNAI set
  • the service area of PSA1 includes the access location of the UE.
  • I-UPF and ULCL+PSA1 can be deployed independently or jointly.
  • the embodiment of this application Take the independent deployment of I-UPF and ULCL+PSA1 as an example to illustrate.
  • ULCL+PSA1 After receiving the request message from I-SMF, ULCL+PSA1 allocates an IP address to the UE and sends the IP address allocated to the UE to I-SMF.
  • ULCL+PSA1 sends the IP address to I-SMF through the PDU session establishment response message.
  • I-SMF sends the IP address and the N9 interface address of ULCL+PSA1 to H-SMF.
  • I-SMF sends the SMF serviced interface_PDU session_update request message to H-SMF through the N16a interface.
  • the SMF serviced interface_PDU session_update request message includes the IP address and the N9 interface address of ULCL+PSA1.
  • I-SMF selects the UPF with uplink offloading function as the ULCL from multiple managed UPFs based on the UE's access location information, and sends the ULCL to H-SMF.
  • N9 interface address and IP address.
  • the service area of the ULCL selected by the I-SMF according to the UE's access location information covers the UE's access location.
  • H-SMF sends the IP address and the N9 interface address of ULCL+PSA1 to PSA2.
  • PSA2 After PSA2 receives the N9 interface address of ULCL+PSA1, it can establish an N9 tunnel from PSA2 to ULCL+PSA1 based on the N9 interface address of ULCL+PSA1. Based on the N9 tunnel, PSA2 can send the downlink data packet sent to the UE to ULCL+PSA1.
  • H-SMF sends the IP address and ULCL+PSA2's N9 interface address to PSA2 through the PDU session establishment request message.
  • PSA2 can also send a PDU session establishment response message to the SMF.
  • H-SMF sends the IP address and ULCL+PSA2's N9 interface address to PSA2 through the PDU session modification request message.
  • PSA2 can also send a PDU session modification response message to the SMF.
  • H-SMF sends offloading rules and forwarding rules to I-SMF.
  • H-SMF sends offloading rules to I-SMF according to the offloading policy received from PCF, and forwarding rules to I-SMF according to the N9 interface address of PSA2.
  • the forwarding rules include the N9 interface address of PSA2, and the forwarding rules are used to instruct upstream data packets that match the offloading rules to be forwarded to the N9 interface of PSA2.
  • I-SMF sends the IP address to AMF.
  • I-SMF when I-UPF and ULCL+PSA1 are deployed independently, I-SMF also sends the N3 interface address of ULCL+PSA1 to AMF.
  • S514 AMF sends the IP address to the RAN.
  • the AMF receives the N3 interface address of ULCL+PSA1, the AMF also sends the N3 interface address of ULCL+PSA1 to the RAN.
  • the RAN sends the IP address to the UE.
  • S516 The RAN sends the N3 interface address of the RAN to the AMF.
  • S517 The AMF sends the N3 interface address of the RAN to the I-SMF.
  • S513 to S517 refer to the description of S408 to S412 in the method 400 above.
  • I-SMF sends the RAN's N3 interface address, offloading rules, and forwarding rules to ULCL+PSA1.
  • SMF sends the RAN's N3 interface address, offloading rules, and forwarding rules to ULCL+PSA1 through the PDU session modification request message.
  • offloading rules and forwarding rules please refer to S415 in method 400 above.
  • ULCL+PSA1 After ULCL+PSA1 receives the N3 interface address of the RAN, it can establish a downlink N3 tunnel from ULCL+PSA1 to the RAN based on the N3 interface address of the RAN. Based on the downlink N3 tunnel, ULCL+PSA1 can send the downlink data packet sent to the UE to the RAN.
  • ULCL+PSA1 After ULCL+PSA1 receives the N9 interface address of PSA2, it can establish an N9 tunnel from ULCL+PSA1 to PSA2 based on the N9 interface address of PSA2. Based on this N9 tunnel, ULCL+PSA1 can send uplink data packets matching the offloading rules to PSA2.
  • the I-SMF selects the UPF with uplink offloading function from the multiple managed UPFs based on the UE's access location information as the ULCL, and sends the RAN's N3 interface address, Diversion rules and forwarding rules.
  • ULCL+PSA1 can also send a PDU session modification response message to the SMF.
  • the access request can match the offloading rules of the subscription service when passing through ULCL+PSA1, and then ULCL+PSA1 forwards the access request to PSA2 through the N9 tunnel between ULCL+PSA1 and PSA2.
  • PSA2 forwards the access request to the DN of the dedicated DNN contracting location through the N6 interface of PSA2. If PSA2 receives a downlink data packet from the DN of the dedicated DNN contracting area, and the destination address of the downlink data packet is the IP address of the UE, PSA2 sends the downlink data packet to ULCL+PSA1 through the N9 tunnel from PSA2 to ULCL+PSA1. Then ULCL+PSA1 sends the downlink data packet to the RAN through the N3 tunnel of ULCL+PSA1 to the RAN, and the RAN sends the downlink data packet to the UE.
  • ULCL+PSA1 routes the access request to the DN corresponding to the public network through the N6 interface. If ULCL+PSA1 receives a downlink data packet from the DN corresponding to the public network, and the destination address of the downlink data packet is the IP address of the UE, ULCL+PSA1 will send the downlink data packet to the RAN through the N3 tunnel from ULCL+PSA1 to RAN. The RAN sends the downlink data packet to the UE.
  • the I-SMF requests ULCL+PSA1 to allocate an IP address to the terminal device. Since ULCL+PSA1 covers the access location of the UE, the IP address assigned by ULCL+PSA1 to the UE is related to the access location of the UE, thereby meeting the operator's needs for region-based service management based on IP addresses.
  • the method provided by the embodiment of the present application is described in detail above with reference to FIGS. 2 to 5 .
  • the communication device provided by the embodiment of the present application will be described in detail below with reference to FIGS. 6 to 8 . It should be understood that the description of the device embodiments corresponds to the description of the method embodiments. Therefore, for content that is not described in detail, please refer to the above method embodiments. For the sake of brevity, they will not be described again here.
  • FIG. 6 is a schematic block diagram of a communication device 1000 provided by an embodiment of the present application.
  • the communication device 1000 may include: a transceiver unit 1010 and a processing unit 1020.
  • the communication device 1000 may be the first session management network element in the above method embodiment, or may be a chip used to implement the functions of the first session management network element in the above method embodiment. .
  • the communication device 1000 may correspond to the first session management network element in the method 200 or the method 300 in the embodiment of the present application, or correspond to the SMF in the method 400, or correspond to the I-SMF in the method 500,
  • the communication device 1000 may include a unit for performing the method performed by the first session management network element in the method 200 in FIG. 2 or the method 300 in FIG. 3, or may include a unit for performing the method 400 in FIG. 4.
  • a unit of the SMF execution method or may include a unit for executing the I-SMF execution method in the method 500 in FIG. 5 .
  • each unit in the communication device 1000 and the above-mentioned other operations and/or functions are respectively intended to implement the method 200 in Figure 2, the method 300 in Figure 3, the method 400 in Figure 4 or the method 500 in Figure 5. process. It should be understood that the specific process of each unit performing the above corresponding steps has been described in detail in the above method embodiments, and will not be described again for the sake of brevity.
  • the communication device 1000 may be the second session management network element in the above method embodiment, or may be used to implement the functions of the second session management network element in the above method embodiment. chip.
  • the communication device 1000 may correspond to the second session management network element in the method 300 of the embodiment of the present application, or, corresponding to the H-SMF in the method 500, the communication device 1000 may include a device configured to perform the steps in Figure 3
  • the unit of the method performed by the second session management network element of the method 300 may include a unit for performing the method performed by the H-SMF in the method 500 in FIG. 5 .
  • each unit in the communication device 1000 and the above-mentioned other operations and/or functions are respectively intended to implement the corresponding flow of the method 300 in FIG. 3 or the method 500 in FIG. 5 . It should be understood that the specific process of each unit performing the above corresponding steps has been described in detail in the above method embodiments, and will not be described again for the sake of brevity.
  • the communication device 1000 may be the second user plane network element in the above method embodiment, or may be used to implement the functions of the second user plane network element in the above method embodiment. chip.
  • the communication device 1000 corresponds to the second user plane network element in the method 200 or 300 in the embodiment of the present application, or corresponds to the PSA2 in the method 400 or 500.
  • the communication device 1000 may include a configuration for executing the figure.
  • each unit in the communication device 1000 and the above-mentioned other operations and/or functions are respectively intended to implement the method 200 in Figure 2, the method 300 in Figure 3, the method 400 in Figure 4 or the method 500 in Figure 5. process. It should be understood that the specific process of each unit performing the above corresponding steps has been described in detail in the above method embodiments, and will not be described again for the sake of brevity.
  • transceiver unit 1010 in the communication device 1000 may correspond to the transceiver 2020 in the device 2000 shown in FIG. 7
  • processing unit 1020 in the communication device 1000 may correspond to the device 2000 shown in FIG. 7 Processors in 2010.
  • the chip when the communication device 1000 is a chip, the chip includes a transceiver unit.
  • the chip may also include a processing unit.
  • the transceiver unit may be an input-output circuit or a communication interface; the processing unit may be a processor, microprocessor, or integrated circuit integrated on the chip.
  • the transceiver unit 1010 is used to implement the signal transceiver operation of the communication device 1000
  • the processing unit 1020 is used to implement the signal processing operation of the communication device 1000 .
  • the transceiver unit 1010 constitutes an acquisition unit, or the transceiver unit 1010 can be called an acquisition unit.
  • the transceiver unit 1010 and the processing unit 1020 form an acquisition unit.
  • the communication device 1000 also includes a storage unit 1030, which is used to store instructions.
  • Figure 7 is a schematic block diagram of a device 2000 provided by an embodiment of the present application.
  • the device 2000 includes: at least one processor 2010.
  • the processor 2010 is coupled to the memory and is used to execute instructions stored in the memory to perform the method described in FIG. 2, FIG. 3, FIG. 4 or FIG. 5.
  • the device 2000 also includes a transceiver 2020.
  • the processor 2010 is coupled to the memory and is used to execute instructions stored in the memory to control the transceiver 2020 to send signals and/or receive signals.
  • the processor 2010 can control Transceiver 2020 transmits IP addresses and/or receives IP addresses.
  • the device 2000 also includes a memory 2030 for storing instructions.
  • processor 2010 and the memory 2030 can be combined into one processing device, and the processor 2010 is used to execute the program code stored in the memory 2030 to implement the above functions.
  • the memory 2030 may also be integrated in the processor 2010 or independent of the processor 2010.
  • the transceiver 2020 may include a receiver and a transmitter.
  • the transceiver 2020 may further include an antenna, and the number of antennas may be one or more.
  • the transceiver 2020 may be a communication interface or an interface circuit.
  • the chip When the device 2000 is a chip, the chip includes a transceiver unit and a processing unit.
  • the transceiver unit may be an input-output circuit or a communication interface;
  • the processing unit may be a processor, microprocessor, or integrated circuit integrated on the chip.
  • FIG 8 is a schematic diagram of a chip system according to an embodiment of the present application.
  • the chip system here may also be a system composed of circuits.
  • the chip system 3000 shown in Figure 8 includes: a logic circuit 3010 and an input/output interface (input/output interface) 3020.
  • the logic circuit is used to couple with the input interface and transmit data (such as IP address) through the input/output interface. ) to perform the method described in Figure 2, Figure 3, Figure 4 or Figure 5.
  • An embodiment of the present application also provides a processing device, including a processor and an interface.
  • the processor may be used to execute the method in the above method embodiment.
  • the above processing device may be a chip.
  • the processing device may be a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), or a system on chip (SoC), or It can be a central processing unit (CPU), a network processor (NP), a digital signal processing circuit (DSP), or a microcontroller unit , MCU), it can also be a programmable logic device (PLD) or other integrated chip.
  • FPGA field programmable gate array
  • ASIC application specific integrated circuit
  • SoC system on chip
  • CPU central processing unit
  • NP network processor
  • DSP digital signal processing circuit
  • MCU microcontroller unit
  • PLD programmable logic device
  • each step of the above method can be completed by instructions in the form of hardware integrated logic circuits or software in the processor.
  • the steps of the methods disclosed in conjunction with the embodiments of the present application can be directly implemented by a hardware processor for execution, or can be executed by a combination of hardware and software modules in the processor.
  • the software module can be located in a random register, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, register, or other mature storage media in this field.
  • the storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware. To avoid repetition, it will not be described in detail here.
  • the processor in the embodiment of the present application may be an integrated circuit chip with signal processing capabilities.
  • each step of the above method embodiment can be completed through an integrated logic circuit of hardware in the processor or instructions in the form of software.
  • the above-mentioned processor may be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.
  • DSP digital signal processor
  • ASIC application-specific integrated circuit
  • FPGA field programmable gate array
  • a general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.
  • non-volatile memory can be read-only memory (ROM), programmable ROM (PROM), erasable programmable read-only memory (erasable PROM, EPROM), electrically removable memory. Erase electrically programmable read-only memory (EPROM, EEPROM) or flash memory. Volatile memory can be random access memory (RAM), which is used as an external cache.
  • RAM random access memory
  • the present application also provides a computer program product.
  • the computer program product includes: computer program code.
  • the computer program code When the computer program code is run on a computer, it causes the computer to execute the steps shown in Figures 2 to 5. The method of any one of the embodiments is shown.
  • the present application also provides a computer-readable medium.
  • the computer-readable medium stores program code.
  • the program code When the program code is run on a computer, it causes the computer to execute the steps shown in Figures 2 to 5. The method of any one of the embodiments is shown.
  • the present application also provides a system, which includes the aforementioned first session management network element and the first user plane network element.
  • the system also includes the aforementioned second session management network element.
  • the system also includes the aforementioned second user plane network element.
  • the above embodiments may be implemented in whole or in part by software, hardware, firmware, or any combination thereof.
  • software When implemented using software, they may be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on the computer, the processes or functions described in the embodiments of the present application are generated in whole or in part.
  • the computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable information medium to another computer-readable storage medium.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains one or more available media integrated.
  • the usable media may be magnetic media (e.g., floppy disks, hard disks, tapes), optical media (e.g., high-density digital video discs (DVD)), or semiconductor media (e.g., solid state disks, SSD)) etc.
  • magnetic media e.g., floppy disks, hard disks, tapes
  • optical media e.g., high-density digital video discs (DVD)
  • DVD digital video discs
  • semiconductor media e.g., solid state disks, SSD
  • the disclosed systems, devices and methods can be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the units is only a logical function division. In actual implementation, there may be other division methods.
  • multiple units or components may be combined or can be integrated into another system, or some features can be ignored, or not implemented.
  • the coupling or direct coupling or communication connection between each other shown or discussed may be through some interfaces, indirect coupling or communication connection of devices or units, which may be in electrical, mechanical or other forms.

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Abstract

本申请实施例提供了一种分配IP地址的方法及通信装置。根据本申请，终端设备的接入位置位于专用DNN签约地之外，则第一会话管理网元请求第一用户面网元为终端设备分配IP地址，第一用户面网元支持会话标识对应的目标DNAI集合中的至少一个目标DNAI，且第一用户面网元的服务区域包括终端设备的接入位置，会话标识用于标识终端设备请求激活的会话。由于第一用户面网元覆盖终端设备的接入位置，因此，第一用户面网元为终端设备分配的IP地址与终端设备的接入位置相关，即可以实现基于拜访地规划的IP地址池为终端设备分配IP地址，从而可以满足运营商基于IP地址实现基于地域的业务管理的需求。

Description

一种分配互联网协议地址的方法及通信装置
本申请要求于2022年06月08日提交中国国家知识产权局、申请号为202210643711.5、申请名称为“一种分配互联网协议地址的方法及通信装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请实施例涉及通信领域，并且更具体地，涉及一种分配互联网协议地址的方法及通信装置。
背景技术
终端设备签约了专用数据网络名称(data network name，DNN)的情况下，由专用DNN签约地内的控制面网元(例如会话管理功能(session management function，SMF)网元)或用户面网元(例如用户面功能(user plane function，UPF)网元)为终端设备分配互联网协议(internet protocol，IP)地址。当终端设备从专用DNN的签约地移动到拜访地(即专用DNN的签约地之外)之后，若终端设备使用专用DNN签约地内的控制面网元或用户面网元为终端设备分配的IP地址访问网络，则运营商无法基于该IP地址实现基于地域的业务管理。
发明内容
本申请实施例提供一种分配互联网协议(internet protocol，IP)地址的方法，以期实现基于拜访地规划的IP地址池为终端设备分配IP地址。
第一方面，提供了一种分配IP地址的方法，该方法可以由第一会话管理网元执行，或者，也可以由第一会话管理网元的组成部件(例如芯片或者电路)执行，对此不作限定，为了便于描述，下面以由第一会话管理网元执行为例进行说明。
该方法包括：第一会话管理网元获取终端设备的会话标识对应的目标数据网络接入标识(data network access identifier，DNAI)集合和该终端设备的接入位置信息，该接入位置信息用于指示该终端设备的接入位置，该接入位置位于该终端设备签约的专用数据网络名称(data network name，DNN)的签约地之外，该会话标识用于标识该终端设备请求激活的会话；该第一会话管理网元根据该目标DNAI集合和该接入位置信息向第一用户面网元发送请求消息，该请求消息用于请求为该终端设备分配IP地址，该第一用户面网元支持该目标DNAI集合中的至少一个目标DNAI，且该第一用户面网元的服务区域包括该接入位置；该第一会话管理网元接收来自该第一用户面网元的该终端设备的IP地址。
基于上述技术方案，终端设备的接入位置位于专用DNN签约地内之外，则第一会话管理网元请求第一用户面网元为终端设备分配IP地址。由于第一用户面网元覆盖终端设备的接入位置，因此，第一用户面网元为终端设备分配的IP地址与终端设备的接入位置 相关，即可以实现基于拜访地规划的IP地址池为终端设备分配IP地址，从而可以满足运营商基于IP地址实现基于地域的业务管理的需求。
当终端设备的接入位置位于专用DNN的签约地之外时，目标DNAI集合用于选择为终端设备提供服务的第一用户面网元。目标DNAI集合包括的至少一个目标DNAI是终端设备的会话标识对应的DNAI，或者，是第一会话管理网元支持的DNAI与终端设备的会话标识对应的DNAI的交集。
结合第一方面，在第一方面的某些实现方式中，该第一会话管理网元部署在该专用DNN的签约地，该第一会话管理网元获取该目标DNAI集合，包括：该第一会话管理网元向策略控制网元发送该会话标识；该第一会话管理网元接收来自该策略控制网元的该目标DNAI集合。
基于上述技术方案，若终端设备的接入位置位于专用DNN签约地内的用户面网元的服务区域之外，但位于专用DNN签约地内的第一会话管理网元的服务区域内，则第一会话管理网元可以接收来自策略控制网元的目标DNAI集合，并基于目标DNAI集合选择为终端设备分配IP地址的第一用户面网元。第一会话管理网元从策略控制网元获取的目标DNAI集合包括会话标识对应的DNAI。
结合第一方面，在第一方面的某些实现方式中，该第一会话管理网元部署在该专用DNN的签约地，该第一会话管理网元获取该目标DNAI集合，包括：该第一会话管理网元向策略控制网元发送该会话标识；该第一会话管理网元接收来自该策略控制网元的分流策略，该分流策略是该会话对应的签约业务的分流策略；该第一会话管理网元根据该分流策略确定该目标DNAI集合。
基于上述技术方案，若终端设备的接入位置位于专用DNN签约地内的用户面网元的服务区域之外，但位于专用DNN签约地内的第一会话管理网元的服务区域内，则第一会话管理网元接收来自策略控制网元的分流策略，并根据分流策略确定目标DNAI集合，从而可以基于目标DNAI集合选择为终端设备分配IP地址的第一用户面网元。
第一会话管理网元根据该分流策略确定的目标DNAI集合包括与该分流策略对应的DNAI。例如，该第一会话管理网元的本地配置信息包括不同分流策略和不同DNAI的对应关系，则第一会话管理网元接收到签约业务的分流策略之后，根据签约业务的分流策略和该对应关系确定目标DNAI集合，目标DNAI集合包括该对应关系中与签约业务的分流策略对应的DNAI。
结合第一方面，在第一方面的某些实现方式中，该方法还包括：该第一会话管理网元向第二用户面网元发送该IP地址，该第二用户面网元部署在该专用DNN的签约地，该第二用户面网元用于根据该IP地址为该终端设备建立该会话；该第一会话管理网元通过接入管理网元向该终端设备发送该IP地址。
基于上述技术方案，第一会话管理网元将IP地址发送给第二用户面网元和终端设备，使得第二用户面网元和终端设备可以根据该IP地址为终端设备建立会话。
可以理解，第一会话管理网元还可以向第二用户面网元发送上行分流用户面网元的N9接口地址，从而第二用户面网元可以根据该N9接口地址将发送给终端设备的下行数据包发送至该上行分流用户面网元。该上行分流用户面网元的服务区域包括终端设备的接入位置。
结合第一方面，在第一方面的某些实现方式中，该第一会话管理网元部署在专用DNN的签约地之外，该第一会话管理网元获取该目标DNAI集合，包括：该第一会话管理网元向第二会话管理网元发送该会话标识和该第一会话管理网元支持的DNAI，该第二会话管理网元部署在该专用DNN的签约地；该第一会话管理网元接收来自该第二会话管理网元的该目标DNAI集合，该目标DNAI集合包括该会话标识对应的DNAI与该第一会话管理网元支持的DNAI的交集。
基于上述技术方案，若终端设备的接入位置位于第一会话管理网元的服务区域内，第一会话管理网元部署于专用DNN签约地之外，则第一会话管理网元与第二会话管理网元协商确定目标DNAI集合。
结合第一方面，在第一方面的某些实现方式中，该第一会话管理网元部署在该专用DNN的签约地之外，该第一会话管理网元获取该目标DNAI集合，包括：该第一会话管理网元向第二会话管理网元发送该会话标识，该第二会话管理网元部署在该专用DNN的签约地；该第一会话管理网元接收来自该第二会话管理网元的该会话标识对应的DNAI；该第一会话管理网元确定该目标DNAI集合包括该会话标识对应的DNAI与该第一会话管理网元支持的DNAI的交集。
基于上述技术方案，若终端设备的接入位置位于第一会话管理网元的服务区域内，第一会话管理网元部署于专用DNN签约地之外，则第一会话管理网元与第二会话管理网元协商确定目标DNAI集合。
结合第一方面，在第一方面的某些实现方式中，该方法还包括：该第一会话管理网元接收来自该第二会话管理网元的指示信息，该指示信息用于指示由目标用户面网元为该终端设备分配IP地址，该目标用户面网元是根据该会话标识对应的DNAI与该第一会话管理网元支持的DNAI的交集选择的；该第一会话管理网元根据该目标DNAI集合和该接入位置信息向第一用户面网元发送请求消息，包括：该第一会话管理网元根据该指示信息和该目标DNAI集合，确定支持该目标DNAI集合中的至少一个目标DNAI的至少一个该目标用户面网元；该第一会话管理网元根据该接入位置信息，确定该第一用户面网元是至少一个该目标用户面网元中服务区域包括该接入位置的该目标用户面网元；该第一会话管理网元向该第一用户面网元发送该请求消息。
其中，该第一会话管理网元根据该接入位置信息，确定该第一用户面网元是至少一个该目标用户面网元中服务区域包括该接入位置的该目标用户面网元，也可以理解为，该第一会话管理网元根据该接入位置信息，从所述至少一个所述目标用户面网元中确定所述第一用户面网元，所述第一用户面网元的服务区域包括所述接入位置。上述描述也适用于本申请的其他方面的描述，不再赘述。
结合第一方面，在第一方面的某些实现方式中，该方法还包括：该第一会话管理网元向该第二会话管理网元发送该IP地址；该第一会话管理网元通过接入管理网元向该终端设备发送该IP地址。
基于上述技术方案，第一会话管理网元将IP地址发送给第二用户面网元和终端设备，使得第二用户面网元和终端设备可以根据该IP地址为终端设备建立会话。
可以理解，第一会话管理网元还可以向第二会话管理网元发送上行分流用户面网元的N9接口地址，从而第二会话管理网元可以将上行分流用户面网元的N9接口地址发送至第 二用户面网元，使得第二用户面网元可以根据该N9接口地址将发送给终端设备的下行数据包发送至该上行分流用户面网元。该上行分流用户面网元的服务区域包括终端设备的接入位置。
第二方面，提供了一种分配IP地址的方法，该方法可以由第二会话管理网元执行，或者，也可以由第二会话管理网元的组成部件(例如芯片或者电路)执行，对此不作限定，为了便于描述，下面以由第二会话管理网元执行为例进行说明。
该方法包括：第二会话管理网元接收来自第一会话管理网元的会话标识和该第一会话管理网元支持的DNAI，该会话标识用于标识终端设备请求激活的会话，该第二会话管理网元部署在该终端设备签约的专用DNN的签约地，该第一会话管理网元部署在该签约地之外；该第二会话管理网元向该第一会话管理网元发送该会话标识对应的目标DNAI集合，该目标DNAI集合包括该会话标识对应的DNAI与该第一会话管理网元支持的DNAI的交集；该第二会话管理网元接收来自该第一会话管理网元的该终端设备的IP地址，该IP地址是第一用户面网元为该终端设备分配的，该第一用户面网元支持该目标DNAI集合中的至少一个目标DNAI，且该第一用户面网元的服务区域包括该终端设备的接入位置，该终端设备的接入位置位于该签约地之外。
基于上述技术方案，终端设备的接入位置位于专用DNN签约地内之外，则第一会话管理网元请求第一用户面网元为终端设备分配IP地址，并将该IP地址发送至第二会话管理网元。由于第一用户面网元覆盖终端设备的接入位置，因此，第一用户面网元为终端设备分配的IP地址与终端设备的接入位置相关，即可以实现基于拜访地规划的IP地址池为终端设备分配IP地址，从而可以满足运营商基于IP地址实现基于地域的业务管理的需求。
结合第二方面，在第二方面的某些实现方式中，该方法还包括：该第二会话管理网元向该第一会话管理网元发送指示信息，该指示信息用于指示由目标用户面网元为该终端设备分配IP地址，该目标用户面网元是根据该会话标识对应的DNAI与该第一会话管理网元支持的DNAI的交集选择的，该第一用户面网元是至少一个该目标用户面网元中服务区域包括该接入位置的该目标用户面网元。也可以理解为，该目标用户面网元是根据该接入位置信息，从所述至少一个所述目标用户面网元中确定出的目标用户面网元，也即第一用户面网元，其中该第一用户面网元的服务区域包括所述接入位置。上述描述也适用于本申请的其他方面的描述，不再赘述。
结合第二方面，在第二方面的某些实现方式中，该方法还包括：该第二会话管理网元向第二用户面网元发送该IP地址，该第二用户面网元部署在该专用DNN的签约地，该第二用户面网元用于根据该IP地址为该终端设备建立该会话。
基于上述技术方案，第二会话管理网元将IP地址发送给第二用户面网元，使得第二用户面网元可以根据该IP地址为终端设备建立会话。
可以理解，第二会话管理网元还可以向第二用户面网元发送上行分流用户面网元的N9接口地址，从而第二用户面网元可以根据该N9接口地址将发送给终端设备的下行数据包发送至该上行分流用户面网元。该上行分流用户面网元的服务区域包括终端设备的接入位置，上行分流用户面网元的N9接口地址是第一会话管理网元向第二会话管理网元发送的。
第三方面，提供了一种分配IP地址的方法，该方法可以由第二会话管理网元执行， 或者，也可以由第二会话管理网元的组成部件(例如芯片或者电路)执行，对此不作限定，为了便于描述，下面以由第二会话管理网执行为例进行说明。
该方法包括：第二会话管理网元接收来自第一会话管理网元的会话标识，该会话标识用于标识该终端设备请求激活的会话，该第二会话管理网元部署在该终端设备签约的专用DNN的签约地，该第一会话管理网元部署在该签约地之外；该第二会话管理网元向该第一会话管理网元发送该会话标识对应的DNAI；该第二会话管理网元接收来自该第一会话管理网元的该终端设备的IP地址，该IP地址是第一用户面网元为该终端设备分配的，该第一用户面网元支持该会话标识对应的目标DNAI集合中的至少一个目标DNAI，且该第一用户面网元的服务区域包括该终端设备的接入位置，该目标DNAI集合包括该会话标识对应的DNAI与该第一会话管理网元支持的DNAI的交集，该终端设备的接入位置位于该签约地之外。
基于上述技术方案，终端设备的接入位置位于专用DNN签约地内之外，则第一会话管理网元请求第一用户面网元为终端设备分配IP地址，并将该IP地址发送至第二会话管理网元。由于第一用户面网元覆盖终端设备的接入位置，因此，第一用户面网元为终端设备分配的IP地址与终端设备的接入位置相关，即可以实现基于拜访地规划的IP地址池为终端设备分配IP地址，从而可以满足运营商基于IP地址实现基于地域的业务管理的需求。
结合第三方面，在第三方面的某些实现方式中，该方法还包括：该第二会话管理网元向该第一会话管理网元发送指示信息，该指示信息用于指示由目标用户面网元为该终端设备分配IP地址，该目标用户面网元是根据会话标识对应的DNAI与该第一会话管理网元支持的DNAI的交集选择的，该第一用户面网元是至少一个该目标用户面网元中服务区域包括该接入位置的该目标用户面网元。
结合第三方面，在第三方面的某些实现方式中，该方法还包括：该第二会话管理网元向第二用户面网元发送该IP地址，该第二用户面网元部署在该专用DNN的签约地，该第二用户面网元用于根据该IP地址为该终端设备建立该会话。
基于上述技术方案，第二会话管理网元将IP地址发送给第二用户面网元，使得第二用户面网元可以根据该IP地址为终端设备建立会话。
可以理解，第二会话管理网元还可以向第二用户面网元发送上行分流用户面网元的N9接口地址，从而第二用户面网元可以根据该N9接口地址将发送给终端设备的下行数据包发送至该上行分流用户面网元。该上行分流用户面网元的服务区域包括终端设备的接入位置，上行分流用户面网元的N9接口地址是第一会话管理网元向第二会话管理网元发送的。
第四方面，提供了一种建立会话的方法，该方法可以由第二用户面网元执行，或者，也可以由第二用户面网元的组成部件(例如芯片或者电路)执行，对此不作限定，为了便于描述，下面以由第二用户面网元执行为例进行说明。
该方法包括：第二用户面网元接收来自会话管理网元的终端设备的IP地址，该IP地址是第一用户面网元为该终端设备分配的，该第一用户面网元支持会话标识对应的目标DNAI集合中的至少一个目标DNAI，且该第一用户面网元的服务区域包括该终端设备的接入位置，该会话标识用于标识该终端设备请求激活的会话，该第二用户面网元部署在该终端设备签约的专用DNN的签约地，该终端设备的接入位置位于该专用DNN的签约地 之外；该第二用户面网元根据IP地址为该终端设备建立该会话。
基于上述技术方案，会话管理网元将IP地址发送给第二用户面网元，使得第二用户面网元可以根据该IP地址为终端设备建立会话。由于第一用户面网元覆盖终端设备的接入位置，因此，第一用户面网元为终端设备分配的IP地址与终端设备的接入位置相关，即可以实现基于拜访地规划的IP地址池为终端设备分配IP地址，从而可以满足运营商基于IP地址实现基于地域的业务管理的需求。
可以理解，会话管理网元还可以向第二用户面网元发送上行分流用户面网元的N9接口地址，从而第二用户面网元可以根据该N9接口地址将发送给终端设备的下行数据包发送至该上行分流用户面网元。该上行分流用户面网元的服务区域包括终端设备的接入位置。
第五方面，提供了一种通信装置，该通信装置包括获取单元和收发单元，该获取单元用于获取终端设备的会话标识对应的目标DNAI集合和该终端设备的接入位置信息，该接入位置信息用于指示该终端设备的接入位置，该接入位置位于该终端设备签约的专用DNN的签约地之外，该会话标识用于标识该终端设备请求激活的会话；该收发单元用于根据该目标DNAI集合和该接入位置信息向第一用户面网元发送请求消息，该请求消息用于请求为该终端设备分配IP地址，该第一用户面网元支持该目标DNAI集合中的至少一个目标DNAI，且该第一用户面网元的服务区域包括该接入位置；该收发单元还用于接收来自该第一用户面网元的该终端设备的IP地址。
结合第五方面，在第五方面的某些实现方式中，该获取单元包括该收发单元，该收发单元还用于向策略控制网元发送该会话标识；该收发单元还用于接收来自该策略控制网元的该目标DNAI集合。
结合第五方面，在第五方面的某些实现方式中，该获取单元包括该收发单元和处理单元，该收发单元还用于向策略控制网元发送该会话标识；该收发单元还用于接收来自该策略控制网元的分流策略，该分流策略是该会话对应的签约业务的分流策略；该处理单元用于根据该分流策略确定该目标DNAI集合。
结合第五方面，在第五方面的某些实现方式中，该收发单元还用于向第二用户面网元发送该IP地址，该第二用户面网元部署在该专用DNN的签约地，该第二用户面网元用于根据该IP地址为该终端设备建立该会话；该收发单元还用于通过接入管理网元向该终端设备发送该IP地址。
结合第五方面，在第五方面的某些实现方式中，该获取单元包括该收发单元，该收发单元还用于向第二会话管理网元发送该会话标识和第一会话管理网元支持的DNAI，该第二会话管理网元部署在该专用DNN的签约地；该收发单元还用于接收来自该第二会话管理网元的该目标DNAI集合，该目标DNAI集合包括该会话标识对应的DNAI与该第一会话管理网元支持的DNAI的交集。
结合第五方面，在第五方面的某些实现方式中，该获取单元包括该收发单元和处理单元，该收发单元还用于向第二会话管理网元发送该会话标识，该第二会话管理网元部署在该专用DNN的签约地；该收发单元还用于接收来自该第二会话管理网元的该会话标识对应的DNAI；该处理单元用于确定该目标DNAI集合包括该会话标识对应的DNAI与第一会话管理网元支持的DNAI的交集。
结合第五方面，在第五方面的某些实现方式中，该收发单元还用于接收来自该第二会 话管理网元的指示信息，该指示信息用于指示由目标用户面网元为该终端设备分配IP地址，该目标用户面网元是根据该会话标识对应的DNAI与该第一会话管理网元支持的DNAI的交集选择的；该处理单元还用于根据该指示信息和该目标DNAI集合，确定支持该目标DNAI集合中的至少一个目标DNAI的至少一个该目标用户面网元；该处理单元还用于根据该接入位置信息，确定该第一用户面网元是至少一个该目标用户面网元中服务区域包括该接入位置的该目标用户面网元；该收发单元还用于向该第一用户面网元发送该请求消息。可以理解的是，该处理单元还用于根据该接入位置信息，确定该第一用户面网元是至少一个该目标用户面网元中服务区域包括该接入位置的该目标用户面网元，可以理解为，所述处理单元还用于根据所述接入位置信息，从所述至少一个所述目标用户面网元中确定所述第一用户面网元，所述第一用户面网元的服务区域包括所述接入位置。
结合第五方面，在第五方面的某些实现方式中，该收发单元还用于向该第二会话管理网元发送该IP地址；该收发单元还用于通过接入管理网元向该终端设备发送该IP地址。
第六方面，提供了一种通信装置，该通信装置包括收发单元，该收发单元用于接收来自第一会话管理网元的会话标识和该第一会话管理网元支持的DNAI，该会话标识用于标识终端设备请求激活的会话，该通信装置部署在该终端设备签约的专用DNN的签约地，该第一会话管理网元部署在该签约地之外；该收发单元还用于向该第一会话管理网元发送该会话标识对应的目标DNAI集合，该目标DNAI集合包括该会话标识对应的DNAI与该第一会话管理网元支持的DNAI的交集；该收发单元还用于接收来自该第一会话管理网元的该终端设备的IP地址，该IP地址是第一用户面网元为该终端设备分配的，该第一用户面网元支持该目标DNAI集合中的至少一个目标DNAI，且该第一用户面网元的服务区域包括该终端设备的接入位置，该终端设备的接入位置位于该签约地之外。
结合第六方面，在第六方面的某些实现方式中，该收发单元还用于向该第一会话管理网元发送指示信息，该指示信息用于指示由目标用户面网元为该终端设备分配IP地址，该目标用户面网元是根据该会话标识对应的DNAI与该第一会话管理网元支持的DNAI的交集选择的，该第一用户面网元是至少一个该目标用户面网元中服务区域包括该接入位置的该目标用户面网元。
结合第六方面，在第六方面的某些实现方式中，该收发单元还用于向第二用户面网元发送该IP地址，该第二用户面网元部署在该专用DNN的签约地，该第二用户面网元用于根据该IP地址为该终端设备建立该会话。
第七方面，提供了一种通信装置，该通信装置包括收发单元，该收发单元用于接收来自第一会话管理网元的会话标识，该会话标识用于标识该终端设备请求激活的会话，该通信装置部署在该终端设备签约的专用DNN的签约地，该第一会话管理网元部署在该签约地之外；该收发单元还用于向该第一会话管理网元发送该会话标识对应的DNAI；该收发单元还用于接收来自该第一会话管理网元的该终端设备的IP地址，该IP地址是第一用户面网元为该终端设备分配的，该第一用户面网元支持该会话标识对应的目标DNAI集合中的至少一个目标DNAI，且该第一用户面网元的服务区域包括该终端设备的接入位置，该目标DNAI集合包括该会话标识对应的DNAI与该第一会话管理网元支持的DNAI的交集，该终端设备的接入位置位于该签约地之外。
结合第七方面，在第七方面的某些实现方式中，该收发单元还用于向该第一会话管理 网元发送指示信息，该指示信息用于指示由目标用户面网元为该终端设备分配IP地址，该目标用户面网元是根据会话标识对应的DNAI与该第一会话管理网元支持的DNAI的交集选择的，该第一用户面网元是至少一个该目标用户面网元中服务区域包括该接入位置的该目标用户面网元。
结合第七方面，在第七方面的某些实现方式中，该收发单元还用于向第二用户面网元发送该IP地址，该第二用户面网元部署在该专用DNN的签约地，该第二用户面网元用于根据该IP地址为该终端设备建立该会话。
第八方面，提供了一种通信装置，该通信装置包括收发单元和处理单元，该收发单元用于接收来自会话管理网元的终端设备的IP地址，该IP地址是第一用户面网元为该终端设备分配的，该第一用户面网元支持会话标识对应的目标DNAI集合中的至少一个目标DNAI，且该第一用户面网元的服务区域包括该终端设备的接入位置，该会话标识用于标识该终端设备请求激活的会话，该通信装置部署在该终端设备签约的专用DNN的签约地，该终端设备的接入位置位于该专用DNN的签约地之外；该处理单元用于根据IP地址为该终端设备建立该会话。
第九方面，提供了一种通信装置，包括处理器。该处理器与存储器耦合，可用于执行存储器中的指令，以实现上述第一方面及第一方面中任一种可能实现方式中的方法。可选的，该通信装置还包括存储器。可选的，该通信装置还包括通信接口，处理器与通信接口耦合。
在一种实现方式中，该通信装置为第一会话管理网元。当该通信装置为第一会话管理网元时，该通信接口可以是收发器，或，输入/输出接口。
在另一种实现方式中，该通信装置为配置于第一会话管理网元中的芯片。当该通信装置为配置于第一会话管理网元中的芯片时，该通信接口可以是输入/输出接口。
可选的，该收发器可以为收发电路。可选的，该输入/输出接口可以为输入/输出电路。
第十方面，提供了一种通信装置，包括处理器。该处理器与存储器耦合，可用于执行存储器中的指令，以实现上述第二方面及第二方面中任一种可能实现方式中的方法，或者实现上述第三方面及第三方面中任一种可能实现方式中的方法。可选的，该通信装置还包括存储器。可选的，该通信装置还包括通信接口，处理器与通信接口耦合。
在一种实现方式中，该通信装置为第二会话管理网元。当该通信装置为第二会话管理网元时，该通信接口可以是收发器，或，输入/输出接口。
在另一种实现方式中，该通信装置为配置于第二会话管理网元中的芯片。当该通信装置为配置于第二会话管理网元中的芯片时，该通信接口可以是输入/输出接口。
第十一方面，提供了一种通信装置，包括处理器。该处理器与存储器耦合，可用于执行存储器中的指令，以实现上述第四方面中的方法。可选的，该通信装置还包括存储器。可选的，该通信装置还包括通信接口，处理器与通信接口耦合。
在一种实现方式中，该通信装置为第二用户面网元。当该通信装置为第二用户面网元时，该通信接口可以是收发器，或，输入/输出接口。
在另一种实现方式中，该通信装置为配置于第二用户面网元中的芯片。当该通信装置为配置于第二用户面网元中的芯片时，该通信接口可以是输入/输出接口。
第十二方面，提供了一种处理器，包括：输入电路、输出电路和处理电路。所述处理 电路用于通过所述输入电路接收信号，并通过所述输出电路发射信号，使得所述处理器执行第一方面至第四方面中任一种可能实现方式中的方法。
在具体实现过程中，上述处理器可以为一个或多个芯片，输入电路可以为输入管脚，输出电路可以为输出管脚，处理电路可以为晶体管、门电路、触发器和各种逻辑电路等。输入电路所接收的输入的信号可以是由例如但不限于接收器接收并输入的，输出电路所输出的信号可以是例如但不限于输出给发射器并由发射器发射的，且输入电路和输出电路可以是同一电路，该电路在不同的时刻分别用作输入电路和输出电路。本申请实施例对处理器及各种电路的具体实现方式不做限定。
第十三方面，提供了一种处理装置，包括处理器和存储器。该处理器用于读取存储器中存储的指令，并可通过接收器接收信号，通过发射器发射信号，以执行第一方面至第四方面中任一种可能实现方式中的方法。
可选的，所述处理器为一个或多个，所述存储器为一个或多个。
可选的，所述存储器可以与所述处理器集成在一起，或者所述存储器与处理器分离设置。
在具体实现过程中，存储器可以为非瞬时性(non-transitory)存储器，例如只读存储器(read only memory，ROM)，其可以与处理器集成在同一块芯片上，也可以分别设置在不同的芯片上，本申请实施例对存储器的类型以及存储器与处理器的设置方式不做限定。
应理解，相关的数据交互过程例如发送请求消息可以为从处理器输出请求消息的过程，接收请求消息可以为处理器接收输入请求消息的过程。具体地，处理器输出的数据可以输出给发射器，处理器接收的输入数据可以来自接收器。其中，发射器和接收器可以统称为收发器。
上述第十三方面中的处理装置可以是一个或多个芯片。该处理装置中的处理器可以通过硬件来实现也可以通过软件来实现。当通过硬件实现时，该处理器可以是逻辑电路、集成电路等；当通过软件来实现时，该处理器可以是一个通用处理器，通过读取存储器中存储的软件代码来实现，该存储器可以集成在处理器中，可以位于该处理器之外，独立存在。
第十四方面，提供了一种计算机程序产品，所述计算机程序产品包括：计算机程序(也可以称为代码，或指令)，当所述计算机程序被运行时，使得计算机执行上述第一方面至第四方面中任一种可能实现方式中的方法。
第十五方面，提供了一种计算机可读存储介质，所述计算机可读存储介质存储有计算机程序(也可以称为代码，或指令)当其在计算机上运行时，使得上述第一方面至第四方面中任一种可能实现方式中的方法被执行。
第十六方面，提供了一种通信系统，包括前述的第一会话管理网元和第一用户面网元，该第一会话管理网元用于执行上述第一方面及第一方面中任一种可能实现方式中的方法。
可选的，该通信系统还包括前述的第二会话管理网元，该第二会话管理网元用于执行上述第二方面及第二方面中任一种可能实现方式中的方法，或者，用于执行上述第三方面及第三方面中任一种可能实现方式中的方法。
可选的，该通信系统还包括前述的第二用户面网元，该第二用户面网元用于执行上述第四方面中的方法。
附图说明
图1是适用于本申请实施例提供的方法的通信系统的示意图；
图2是本申请实施例提供的方法的示意性流程图；
图3是本申请实施例提供的方法的示意性流程图；
图4是本申请实施例提供的方法的示意性流程图；
图5是本申请实施例提供的方法的示意性流程图；
图6是本申请实施例提供的通信装置的示意图；
图7是本申请另一实施例提供的通信装置的示意性框图；
图8是本申请实施例提供的一种芯片系统的示意图。
具体实施方式
下面将结合附图，对本申请实施例中的技术方案进行描述。
本申请实施例的技术方案可以应用于各种通信系统，例如：长期演进(long term evolution，LTE)系统、频分双工(frequency division duplex，FDD)系统、时分双工(time division duplex，TDD)系统、全球互联微波接入(worldwide interoperability for microwave access，WiMAX)通信系统、第五代(5th generation，5G)系统或新无线(new radio，NR)、第六代(6th generation，6G)系统或未来的通信系统等。本申请中所述的5G移动通信系统包括非独立组网(non-standalone，NSA)的5G移动通信系统或独立组网(standalone，SA)的5G移动通信系统。通信系统还可以是公共陆地移动网络(public land mobile network，PLMN)、设备到设备(device to device，D2D)通信系统、机器到机器(machine to machine，M2M)通信系统、物联网(Internet of things，IoT)通信系统、车联万物(vehicle to everything，V2X)通信系统、无人机(uncrewed aerial vehicle，UAV)通信系统或者其他通信系统。
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和b，a和c，b和c，或a和b和c，其中a，b，c可以是单个，也可以是多个。另外，为了便于清楚描述本申请实施例中的技术方案，在本申请的实施例中，采用“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。同时，在本申请实施例中，“示例性的”或者“例如”等词用于表示作例子、例证或说明。本申请实施例中被描述为“示例性的”或者“例如”的任何实施例或技术方案不应被解释为比其他实施例或技术方案更优选或更具优势。确切而言，使用“示例性的”或者“例如”等词旨在以具体方式呈现相关概念，便于理解。
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地说明本申请实施 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。
图1示出了适用于本申请实施例提供的方法的通信系统的示意图。如图1中的(a)所示，该通信系统包括：
1、终端设备：可以称为用户设备(user equipment，UE)，是一种向用户提供语音/数据连通性的设备，例如，具有无线连接功能的手持式设备、车载设备等，目前，一些终端设备的举例可以为：手机(mobile phone)、平板电脑(pad)、带无线收发功能的电脑(如笔记本电脑、掌上电脑等)、移动互联网设备(mobile internet device，MID)、虚拟现实(virtual reality，VR)设备、增强现实(augmented reality，AR)设备、工业控制(industrial control)中的无线终端、无人驾驶(self driving)中的无线终端、远程医疗(remote medical)中的无线终端、智能电网(smart grid)中的无线终端、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端、智慧家庭(smart home)中的无线终端、蜂窝电话、无绳电话、会话启动协议(session initiation protocol，SIP)电话、无线本地环路(wireless local loop，WLL)站、个人数字处理(personal digital assistant，PDA)、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备，5G网络中的终端设备或者未来演进的PLMN中的终端设备等，本申请实施例对此并不限定。
2、接入网设备：为特定区域的授权用户提供入网功能，并能够根据用户的级别，业务的需求等使用不用质量的传输隧道。目前的接入网络技术包括：第三代(3rd generation，3G)系统中采用的无线接入网技术、第四代(4th generation，4G)系统中采用的无线接入网技术、或下一代无线接入网(next generation radio access network，NG-RAN)技术(如5G系统中采用的无线接入技术等)。
基于无线通信技术实现接入网络功能的接入网设备可以称为无线接入网(radio access network，RAN)设备。无线接入网设备能够管理无线资源，为终端设备提供接入服务，进而完成控制信号和用户数据在终端设备和核心网之间的转发。无线接入网设备例如可以是基站(NodeB)、演进型基站(evolutional NodeB，eNB或eNodeB)、5G移动通信系统中的下一代基站节点(next generation Node base station，gNB)、未来移动通信系统中的基站或wifi无线热点系统中的接入点(access point，AP)等，还可以是云无线接入网络(cloud radio access network，CRAN)场景下的无线控制器，或者该无线接入网设备可以为中继站、接入点、车载设备、无人机、可穿戴设备以及5G网络中的网络设备或者演进PLMN中的网络设备等。本申请实施例对无线接入网设备所采用的具体技术和具体设备形态不做限定。
3、接入管理网元：主要用于移动性管理和接入管理、负责在终端设备与策略控制功能(policy control function，PCF)网元间传递用户策略等，可以用于实现移动性管理实体(mobile management entity，MME)功能中除会话管理之外的其他功能。例如，接入授权(鉴权)功能。
在5G通信系统中，接入管理网元可以是接入和移动性管理功能(access and mobility management function，AMF)网元。在未来的通信系统中，接入管理网元可以是AMF网 元，或者，还可以有其他的名称，本申请不做限定。
4、会话管理网元：主要用于会话管理、用户设备的互联网协议(internet protocol，IP)地址的分配和管理、选择可管理用户平面功能、策略控制和收费功能接口的终结点以及下行数据通信等。
在5G通信系统中，会话管理网元可以是会话管理功能(session management function，SMF)网元。在未来通信系统中，会话管理网元可以是SMF网元，或者，还可以有其他的名称，本申请不做限定。
如图1中的(b)所示，该通信系统可以包括归属SMF(home SMF，H-SMF)和中间SMF(intermediate SMF，I-SMF)。H-SMF用于在终端设备的归属地为终端设备提供服务，I-SMF用于在终端设备的拜访地为终端设备提供服务。例如，在终端设备签约了专用数据网络名称(data network name，DNN)的情况下，H-SMF用于在专用DNN的签约地为终端设备提供服务。当终端设备移动到专用DNN的签约地(即移动至H-SMF的服务区域(service area，SA)之外)之外，则H-SMF为终端设备插入I-SMF。
5、用户面网元：用于分组路由和转发、用户面数据的服务质量(quality of services，QoS)处理、完成用户面数据转发、基于会话/流级的计费统计，带宽限制功能等。
在5G通信系统中，用户面网元可以是用户面功能网元(user plane function，UPF)网元。在未来的通信系统中，用户面网元可以是UPF网元，或者，还可以有其他名称，本申请不做限定。
用户面网元可以分为会话锚点用户面网元(如图1中的协议数据单元(protocol data unit，PDU)会话锚点(PDU session anchor，PSA)1和PSA2)、中间用户面网元(如图1中的(b)中的中间UPF(intermediate UPF，I-UPF))、上行分类器(uplink classifier，ULCL)用户面网元、分支点(branching point，BP)用户面网元。
如图1中的(a)所示，该通信系统包括ULCL和PSA2，可选的，该通信系统还包括PSA1，ULCL与PSA1可以是合设的，或者ULCL和PSA1独立部署，图1中的(a)以ULCL和PSA1独立部署为例。其中，ULCL和PSA2为UE提供访问数据网络(data network，DN)2的用户面路径，ULCL和PSA1为UE提供访问DN1的用户面路径。
如图1中的(b)所示，该通信系统包括I-UPF和PSA2。可选的，该通信系统还包括ULCL和PSA1，I-UPF、ULCL和PSA1可以是合设的，或者I-UPF、ULCL和PSA1独立部署，图1中的(b)以I-UPF与ULCL合设，PSA1独立部署为例。其中，I-UPF和PSA2为UE提供访问DN2的用户面路径，ULCL和PSA1为UE提供访问DN1的用户面路径。
6、数据网络网元：用于提供传输数据的网络。
在5G通信系统中，数据网络网元可以是DN网元。在未来的通信系统中，数据网络网元可以是DN网元，或者，还可以有其他的名称，本申请不做限定。
7、策略控制网元：用于通过统一的策略框架指导网络的行为，为控制面功能网元(例如AMF，SMF网元等)提供策略规则信息等。
在4G通信系统中，该策略控制网元可以是策略和计费规则功能(policy and charging rules function，PCRF)网元。在5G通信系统中，该策略控制网元可以是策略控制功能(policy control function，PCF)网元。在未来的通信系统中，该策略控制网元可以是PCF网元，或者，还可以有其他名称，本申请不做限定。
图1中的N1、N2、N3、N4、N6、N7、N9、N11、N14、N15以及N16a为接口序号。这些接口序号的含义可参见第三代合作伙伴项目(3rd generation partnership project，3GPP)技术标准(technical standards，TS)23.501定义的含义。
应理解，上述应用于本申请实施例的网络架构仅是举例说明，适用于本申请实施例的网络架构并不局限于此，任何能够实现上述各网元的功能的网络架构都适用于本申请实施例。
还应理解，图1所示的AMF、SMF、UPF、PCF等可以理解为核心网中用于实现不同功能的网元，例如可以按需组合成网络切片。这些核心网网元可以是各自独立的设备，也可以是集成于同一设备中实现不同的功能，本申请对于上述网元的具体形态不作限定。
还应理解，上述命名仅为便于区分不同的功能而定义，不应对本申请构成任何限定。本申请并不排除在5G网络以及未来其他的网络中采用其他命名的可能。例如，在6G网络中，上述各个网络中的而部分或全部可以沿用5G的术语，也可能采用其他名称等。图1中的各个网元之间的接口名称只是一个示例，具体实现中接口名称可能为其他的名称，本申请对此不作限定。此外，上述各个网元之间所传输的消息(或信令)的名称也仅仅是一个示例，对消息本身的功能不构成任何限定。
在终端设备签约了专用DNN的情况下，由专用DNN签约地内的控制面网元(例如SMF)或用户面网元(例如UPF)为终端设备分配IP地址。当终端设备从专用DNN的签约地移动到拜访地(专用DNN的签约地之外)之后，若终端设备使用专用DNN签约地内的控制面网元或用户面网元分配的IP地址访问网络，则运营商无法基于该IP地址实现基于地域的业务管理。
有鉴于此，本申请实施例提供一种分配IP地址的方法，以实现基于拜访地规划的IP地址池为终端设备分配IP地址。
需要说明的是，在本申请实施例中，终端设备签约了专用DNN，且终端设备位于专用DNN的签约地之外。终端设备位于专用DNN的签约地之外包括两种情况：情况1，终端设备位于专用DNN签约地内的会话管理网元的服务区域内，且位于专用DNN签约地内的用户面网元的服务区域之外；情况2，终端设备位专用DNN签约地内的会话管理网元的服务区域之外，且位于专用DNN签约地内的用户面网元的服务区域之外。
下面结合图2，以上述情况1为例，说明本申请实施例提供的分配IP地址的方法。
图2示出了本申请实施例提供的分配IP地址的方法200的示意性流程图。该方法200可以包括以下步骤：
S210，第一会话管理网元获取会话标识#1对应的目标数据网络接入标识(data network access identifier，DNAI)集合和终端设备的接入位置信息。
第一会话管理网元部署在终端设备签约的专用DNN(下文中记为DNN#1)签约地内，第一会话管理网元用于在DNN#1签约地内为签约了DNN#1的终端设备提供服务。DNN#1的签约地指的是DNN#1对应的DN的服务区域，或者指的是为签约了DNN#1的终端设备提供服务的核心网网元的服务区域，例如，DNN#1的签约地指的是为签约了DNN#1的终端设备提供服务的用户面网元的服务区域，或者是为签约了DNN#1的终端设备提供服务的会话管理网元的服务区域。例如，DNN#1的签约地是城市A或区域A。
终端设备的接入位置信息包括终端设备接入的小区标识(cell identifier)和/或终端设 备的追踪区标识(tracking area identifier，TAI)，TAI用于标识终端设备的追踪区(trackingarea，TA)。
第一会话管理网元可以从接入管理网元获取终端设备的接入位置信息。例如，接入管理网元接收到来自终端设备的会话标识#1之后，将会话标识#1和终端设备的接入位置信息携带在一条消息中发送给第一会话管理网元。又例如，第一会话管理网元接收到会话标识#1之后，向接入管理网元请求终端设备的接入位置信息；相应的，接入管理网元根据第一会话管理网元的请求向第一会话管理网元发送终端设备的接入位置信息。
会话标识#1为终端设备的会话标识，用于标识终端设备请求激活的会话#1。示例性的，会话标识#1包括以下至少一项：DNN#1或者单网络切片选择辅助信息(single network slice selection assistance information，S-NSSAI)#1，S-NSSAI#1与DNN#1对应。在会话标识#1包括DNN#1和/或S-NSSAI#1的情况下，终端设备请求激活的会话#1是访问DNN#1签约地的DN的会话。
示例性的，会话标识#1是第一会话管理网元通过接入管理网元从终端设备接收的。例如，终端设备向接入管理网元发送PDU会话建立请求(PDU session establishment request)消息，PDU会话建立请求消息包括会话标识#1。进一步地，接入管理网元根据PDU会话建立请求消息向第一会话管理网元发起SMF服务化接口_PDU会话_创建会话管理(session management，SM)上下文请求(Nsmf_PDUSession_CreatSMContext Request)服务，SMF服务化接口_PDU会话_创建会话管理上下文请求服务包括会话标识#1。
会话标识#1对应的目标DNAI集合包括一个或多个目标DNAI。当终端设备的接入位置位于专用DNN的签约地之外时，该一个或多个目标DNAI用于选择为终端设备提供服务的第一用户面网元。例如，该一个或多个目标DNAI是会话标识#1对应的DNAI。
本申请实施例对第一会话管理网元获取会话标识#1对应的目标DNAI集合的方式不做限定。
一种可能的实现方式中，第一会话管理网元中预配置会话标识#1对应的目标DNAI集合。
示例性的，第一会话管理网元中预配置了对应关系#1，对应关系#1是不同会话标识和不同DNAI的对应关系，则第一会话管理网元接收到来自终端设备的会话标识#1之后，根据会话标识#1和对应关系#1确定目标DNAI集合，目标DNAI集合包括对应关系#1中与会话标识#1对应的DNAI。
例如，第一会话管理网元中预配置的对应关系#1如表1所示，若第一会话管理网元接收的会话标识#1包括DNN#1，则第一会话管理网元确定会话标识#1对应的目标DNAI集合包括与DNN#1对应的DNAI#1和DNAI#2。
表1不同会话标识和不同DNAI的对应关系
又示例性的，第一会话管理网元中预配置了对应关系#2和对应关系#3，对应关系#2是不同DNN和不同DNAI的对应关系，对应关系#3是不同S-NSSAI和不同DNN的对应 关系。若第一会话管理网元接收的会话标识#1包括DNN#1，则第一会话管理网元根据DNN#1和对应关系#2确定目标DNAI集合，目标DNAI集合包括对应关系#2中与DNN#1对应的DNAI。若第一会话管理网元接收的会话标识#1包括S-NSSAI#1，但不包括DNN#1，则第一会话管理网元首先根据对应关系#3确定S-NSSAI#1对应的DNN，例如为DNN#1，然后根据DNN#1和对应关系#2确定目标DNAI集合，目标DNAI集合包括对应关系#2中与DNN#1对应的DNAI。
另一种可能的实现方式中，第一会话管理网元从策略控制网元获取会话标识#1对应的目标DNAI集合。例如，第一会话管理网元获取目标DNAI集合的步骤可以包括S211a和S212a。
S211a，第一会话管理网元向策略控制网元发送会话标识#1。
策略控制网元部署在DNN#1的签约地内，策略控制网元可以与部署在DNN#1的签约地内的第一会话管理网元进行通信。
例如，第一会话管理网元通过PCF服务化接口_会话管理策略控制_创建请求(Npcf_SMPolicyControl_Create Request)服务向策略控制网元发送会话标识#1。
S212a，策略控制网元向第一会话管理网元发送目标DNAI集合。
策略控制网元接收到会话标识#1之后，确定会话标识#1对应的目标DNAI集合包括会话标识#1对应的DNAI，并将会话标识#1对应的目标DNAI集合发送至第一会话管理网元。
例如，策略控制网元通过PCF服务化接口_会话管理策略控制_创建响应(Npcf_SMPolicyControl_Create Response)服务向第一会话管理网元发送目标DNAI集合。
再一种可能的实现方式中，第一会话管理网元可以根据签约业务的分流策略和本地配置信息确定会话标识#1对应的目标DNAI集合。例如，第一会话管理网元获取目标DNAI集合的步骤可以包括S211b至S213b。
S211b，第一会话管理网元向策略控制网元发送会话标识#1。
S211b可以参考S211a的描述。
S212b，策略控制网元向第一会话管理网元发送签约业务的分流策略。
签约业务是终端设备通过会话标识#1所标识的会话#1访问的业务，签约业务的分流策略包括签约业务的业务信息，业务信息包括业务的全量域名(fully qualified domain name，FQDN)、业务的IP五元组描述信息等。IP五元组描述信息可以为：源IP地址(source IP address)、目的IP地址(destination IP address)、源端口号(sourceport number)、目的端口号(destination port number)和协议类型。
策略控制网元接收到会话标识#1之后，向第一会话管理网元发送签约业务的分流策略。分流策略可以参考上文S212a中的描述。
例如，策略控制网元通过PCF服务化接口_会话管理策略控制_创建响应服务向第一会话管理网元发送签约业务的分流策略。
S213b，第一会话管理网元确定目标DNAI集合。
第一会话管理网元接收到签约业务的分流策略之后，根据分流策略确定会话标识#1对应的目标DNAI集合，目标DNAI集合包括分流策略对应的DNAI。例如，本地配置信息包括对应关系#4，对应关系#4是不同分流策略和不同DNAI的对应关系。第一会话管 理网元接收到签约业务的分流策略之后，根据分流策略和对应关系#4确定目标DNAI集合，目标DNAI集合包括对应关系#4中与该分流策略对应的DNAI。
S220，第一会话管理网元向第一用户面网元发送请求消息。
相应的，第一用户面网元接收来自第一会话管理网元的请求消息。
第一用户面网元支持会话标识#1对应的目标DNAI集合中的至少一个目标DNAI，且第一用户面网元的服务区域包括终端设备的接入位置。第一用户面网元也可以称为主锚点用户面网元。
请求消息用于请求为终端设备分配IP地址。示例性的，请求消息可以是PDU会话建立请求(PDU session establishment request)消息。请求消息可以包括第一用户面网元支持的至少一个目标DNAI。
第一会话管理网元获取到会话标识#1对应的目标DNAI集合和终端设备的接入位置信息之后，根据会话标识#1对应的目标DNAI集合和终端设备的接入位置信息，从第一会话管理网元管理的多个用户面网元中选择第一用户面网元，然后向第一用户面网元发送请求消息。例如，会话标识#1对应的目标DNAI集合包括DNAI#1和DNAI#2，终端设备的接入位置信息包括终端设备的TAI，则第一用户面网元支持DNAI#1和/或DNAI#2，且服务区域包括TAI标识的TA。
可选的，若第一会话管理网元管理的多个用户面网元中，存在多个可供选择的用户面网元，多个可供选择的用户面网元中的每个用户面网元都支持会话标识#1对应的目标DNAI集合中的至少一个目标DNAI，且服务区域包括终端设备的接入位置，则第一会话管理网元可以选择多个可供选择的用户面网元中的任一用户面网元作为第一用户面网元，例如，第一会话管理网元管理的用户面网元#1支持DNAI#1，且服务区域包括终端设备的TA，第一会话管理网元管理的用户面网元#2支持DANI#2，且服务区域包括终端设备的TA，则第一会话管理网元可以将用户面网元#1或用户面网元#2作为第一用户面网元。或者，第一会话管理网元选择多个可供选择的用户面网元中负载最低的用户面网元作为第一用户面网元。例如，上述例子中，用户面网元#1是用户面网元#1与用户面网元#2中负载最低的用户面网元，那么第一会话管理网元选择用户面网元#1作为第一用户面网元。
一种可能的实现方式中，第一会话管理网元根据协议预定义的规则向第一用户面网元请求终端设备的IP地址，即第一会话管理网元根据协议预定义的规则从管理的多个用户面网元中选择第一用户面网元之后，向第一用户面网元发送请求消息，以请求第一用户面网元为终端设备分配IP地址。
另一种可能的实现方式中，第一会话管理网元根据指示信息#1，确定向第一用户面网元请求终端设备的IP地址，指示信息#1用于指示由目标用户面网元为终端设备分配IP地址，目标用户面网元是第一会话管理网元根据DNAI选择的。示例性的，第一会话管理网元中预配置与指示信息#1对应的DNAI。例如，若第一会话管理网元中预配置的与指示信息#1对应的DNAI包括DNAI#1和DNAI#2，DNAI#1和DNAI#2属于会话标识#1对应的目标DNAI集合，则第一会话管理网元根据指示信息#1确定，由目标用户面网元为终端设备分配IP地址，目标用户面网元是第一会话管理网元根据DNAI#1和/或DNAI#2选择的。进而，第一会话管理网元根据指示信息#1确定支持DNAI#1和/或DNAI#2的至少一个目标用户面网元，再将至少一个目标用户面网元中服务区域包括终端设备的接入位置的 目标用户面网元确定为第一用户面网元之后，请求第一用户面网元为终端设备分配IP地址。又示例性的，第一会话管理网元接收来自策略控制网元的指示信息#1。例如，策略控制网元向第一会话管理网元发送会话标识#1对应的目标DNAI集合时，将会话标识#1对应的目标DNAI集合和指示信息#1携带在一条消息中发送至第一会话管理网元。例如，若策略控制网元确定会话标识#1对应的目标DNAI集合与指示信息#1对应，则策略控制网元向第一会话管理网元发送指示信息#1。第一会话管理网元接收到来自策略控制网元的指示信息#1之后，根据指示信息#1确定由目标用户面网元为终端设备分配IP地址，目标用户面网元是根据目标DNAI集合选择的。进而，第一会话管理网元根据指示信息#1确定支持目标DNAI集合中的至少一个目标DNAI的至少一个目标用户面网元，再将至少一个目标用户面网元中服务区域包括终端设备的接入位置的目标用户面网元确定为第一用户面网元之后，请求第一用户面网元为终端设备分配IP地址。换句话说，该第一会话管理网元根据该接入位置信息，从所述至少一个所述目标用户面网元中确定目标用户面网元为所述第一用户面网元，所述第一用户面网元的服务区域包括所述接入位置，最终，该第一会话管理网元可以请求该第一用户面网元为终端设备分配IP地址。上述描述也适用于本申请的其他实施例的描述，不再赘述。
再一种可能的实现方式中，若第一会话管理网元确定终端设备位于DNN#1签约地内的用户面网元的服务区域之外，则第一会话管理网元确定向第一用户面网元请求终端设备的IP地址。DNN#1签约地内的用户面网元用于在DNN#1的签约地内为签约了DNN#1的终端设备提供服务。
S230，第一会话管理网元接收来自第一用户面网元的IP地址。
相应的，第一用户面网元向第一会话管理网元发送IP地址。
第一用户面网元接收到来自第一会话管理网元的请求消息之后，则根据请求消息为终端设备分配IP地址，并将分配的IP地址发送给第一会话管理网元。示例性的，第一用户面网元通过PDU会话建立响应(PDU session establishment response)消息向第一会话管理网元发送IP地址。
可选的，方法200还包括S240和S250。
S240，第一会话管理网元向第二用户面网元发送IP地址。
第一会话管理网元向第二用户面网元发送了终端设备的IP地址之后，第二用户面网元可以根据终端设备的IP地址，为终端设备建立会话#1在第二用户面网元与接入网设备之间的传输通道。第二用户面网元为终端设备建立会话#1在第二用户面网元与接入网设备之间的传输通道的更多描述可以参考下文方法400中的S414。
其中，第二用户面网元部署在DNN#1签约地内，即第一会话管理网元从管理的多个用户面网元中选择与DNN#1对应的用户面网元作为第二用户面网元。第二用户面网元可以称为辅锚点用户面网元。
示例性的，第一会话管理网元通过PDU会话建立请求消息向第二用户面网元发送终端设备的IP地址。相应的，第二用户面网元建立会话#1之后，可以向第一会话管理网元发送PDU会话建立响应(PDU session establishment response)消息。
S250，第一会话管理网元向终端设备发送IP地址。
相应的，终端设备接收来自第一会话管理网元的IP地址。
终端设备接收到IP地址之后，根据IP地址建立会话#1在终端设备与接入网设备之间的传输通道。
第一会话管理网元通过接入管理网元向终端设备发送IP地址，例如，第一会话管理网元向接入管理网元发送AMF服务化接口_通信_N1N2消息转发(Namf_Communication_N1N2MessageTransfer)消息，AMF服务化接口_通信_N1N2消息转发消息包括PDU会话建立接受(PDU session establishment accept)消息，PDU会话建立接受消息包括终端设备的IP地址。接入管理网元将PDU会话建立接受消息发送至终端设备。
在本申请实施例中，若终端设备移动至专用DNN签约地内的用户面网元的服务区域之外，则第一会话管理网元请求第一用户面网元为终端设备分配IP地址。由于第一用户面网元覆盖终端设备的接入位置，因此，第一用户面网元为终端设备分配的IP地址与终端设备的接入位置相关，既可以实现基于拜访地规划的IP地址池为终端设备分配IP地址，从而可以满足运营商基于IP地址实现基于地域的业务管理的需求。
下面结合图3，以上述情况2为例，说明本申请实施例提供的分配IP地址的方法。
图3示出了本申请实施例提供的分配IP地址的方法300的示意性流程图。该方法300可以包括以下步骤：
S310，第一会话管理网元获取会话标识#1对应的目标DNAI集合和终端设备的接入位置信息。
第一会话管理网元部署在DNN#1的签约地之外，第一会话管理网元可以称为中间会话管理网元。DNN#1的签约地和会话标识#1的相关描述可以参考上文方法200中的S210。
第一会话管理网元获取终端设备的接入位置信息的描述可以参考上文方法200中的S210。
会话标识#1对应的目标DNAI集合包括一个或多个目标DNAI。当终端设备的接入位置位于专用DNN的签约地之外时，该一个或多个目标DNAI用于选择为终端设备提供服务的第一用户面网元。例如，该一个或多个目标DNAI是第一会话管理网元支持的DNAI与会话标识#1对应的DNAI的交集。
本申请实施例对第一会话管理网元获取会话标识#1对应的目标DNAI集合的方式不做限定。
一种可能的实现方式中，第一会话管理网元获取目标DNAI集合的步骤可以包括S311a和S312a。
S311a，第一会话管理网元向第二会话管理网元发送会话标识#1和第一会话管理网元支持的DNAI。
第二会话管理网元部署在DNN#1的签约地内，第二会话管理网元用于在DNN#1的签约地为签约了DNN#1的终端设备提供服务。第二会话管理网元可以称为归属会话管理网元。
例如，第一会话管理网元通过SMF服务化接口_PDU会话_创建请求(Nsmf_PDUSession_Create Request)消息，向第二会话管理网元发送会话标识#1和第一会话管理网元支持的DNAI。
可选的，在S311a之前，方法300还可以包括：第一会话管理网元接收来自接入管理 网元的第二会话管理网元的地址信息，第二会话管理网元的地址信息包括第二会话管理网元的标识和/或第二会话管理网元的IP地址。第二会话管理网元的地址信息是接入管理网元根据会话标识#1确定的。例如，若会话标识#1包括DNN#1，则接入管理网元根据DNN#1确定与DNN#1对应的第二会话管理网元的地址信息，即确定在DNN#1的签约地内的第二会话管理网元的地址信息。又例如，若会话标识#1包括S-NSSAI#1，不包括DNN#1，则接入管理网元首先确定S-NSSAI#1对应的DNN#1，再确定DNN#1对应的第二会话管理网元的地址信息。
S312a，第一会话管理网元接收来自第二会话管理网元的目标DNAI集合。
会话标识#1对应的目标DNAI集合包括会话标识#1对应的DNAI和第一会话管理网元支持的DNAI的交集。也就是说，第二会话管理网元接收到会话标识#1和第一会话管理网元支持的DNAI之后，首先根据会话标识#1确定会话标识#1对应的DNAI，然后确定会话标识#1对应的目标DNAI集合，目标DNAI集合包括会话标识#1对应的DNAI和第一会话管理网元支持的DNAI的交集，最后第二会话管理网元将会话标识#1对应的目标DNAI集合发送至第一会话管理网元。
第二会话管理网元获取会话标识#1对应的DNAI的方式可以参考上文方法200中第一会话管理网元获取目标DNAI集合的方式的描述。
可选的，方法300还包括：第二会话管理网元向第一会话管理网元发送指示信息#1，指示信息#1用于指示由目标用户面网元为终端设备分配IP地址，目标用户面网元是第一会话管理网元根据会话标识#1对应的DNAI和第一会话管理网元支持的DNAI的交集选择的，或者说目标用户面网元是第一会话管理网元根据目标DNAI集合选择的。例如，第二会话管理网元向第一会话管理网元发送会话标识#1对应的目标DNAI集合时，将会话标识#1对应的目标DNAI集合和指示信息#1携带在一条消息中发送至第一会话管理网元。例如，若第二会话管理网元确定会话标识#1对应的目标DNAI集合与指示信息#1对应，则第二会话管理网元向第一会话管理网元发送指示信息#1。
例如，第二会话管理网元通过SMF服务化接口_PDU会话_创建响应(Nsmf_PDUSession_Create Response)消息，向第一会话管理网元发送会话标识#1对应的目标DNAI集合。
另一种可能的实现方式中，第一会话管理网元获取目标DNAI集合的步骤可以包括S311b至S313b。
S311b，第一会话管理网元向第二会话管理网元发送会话标识#1。
例如，第一会话管理网元可以通过SMF服务化接口_PDU会话_创建请求消息，向第二会话管理网元发送会话标识#1。
可选的，在S311b之前，方法300还可以包括：第一会话管理网元接收来自接入管理网元的第二会话管理网元的地址信息。
S312b，第一会话管理网元接收来自第二会话管理网元的会话标识#1对应的DNAI。
例如，第二会话管理网元通过SMF服务化接口_PDU会话_创建响应消息，向第一会话管理网元发送会话标识#1对应的DNAI。
第二会话管理网元获取会话标识#1对应的DNAI的方式可以参考上文方法200中第一会话管理网元获取目标DNAI集合的方式的描述。
可选的，方法300还包括：第二会话管理网元向第一会话管理网元发送指示信息#1，指示信息#1用于指示由目标用户面网元为终端设备分配IP地址，目标用户面网元是第一会话管理网元根据会话标识#1对应的DNAI和第一会话管理网元支持的DNAI的交集选择的，或者说目标用户面网元是第一会话管理网元根据目标DNAI集合选择的。例如，第二会话管理网元向第一会话管理网元发送会话标识#1对应的DNAI时，将会话标识#1对应的DNAI和指示信息#1携带在一条消息中发送至第一会话管理网元。例如，若第二会话管理网元确定会话标识#1对应的DNAI与指示信息#1对应，则第二会话管理网元向第一会话管理网元发送指示信息#1。
S313b，第一会话管理网元确定目标DNAI集合。
第一会话管理网元接收到会话标识#1对应的DNAI之后，第一会话管理网元确定会话标识#1对应的目标DNAI集合，目标DNAI集合包括会话标识#1对应的DNAI和第一会话管理网元支持的DNAI的交集。
S320，第一会话管理网元向第一用户面网元发送请求消息。
相应的，第一用户面网元接收来自第一会话管理网元的请求消息。
S320可以参考上文方法200中的S220的描述。
需要说明的是，在S320中，若第一会话管理网元接收到来自第二会话管理网元的指示信息#1，则第一会话管理网元可以根据指示信息#1确定向第一用户面网元发送请求消息。也就是说，第一会话管理网元接收到来自第二会话管理网元的指示信息#1之后，根据指示信息#1确定由目标用户面网元为终端设备分配IP地址，目标用户面网元是根据会话标识#1对应的DNAI与第一会话管理网元支持的DNAI的交集选择的，或者说是根据目标DNAI集合选择的。进而，第一会话管理网元根据指示信息#1确定支持目标DNAI集合中的至少一个目标DNAI的至少一个目标用户面网元，再将至少一个目标用户面网元中服务区域包括终端设备的接入位置的目标用户面网元确定为第一用户面网元之后，请求第一用户面网元为终端设备分配IP地址。
S330，第一会话管理网元接收来自第一用户面网元的IP地址。
相应的，第一用户面网元向第一会话管理网元发送IP地址。
S330可以参考上文方法200中的S230的描述。
可选的，方法300还包括S340至S360。
S340，第一会话管理网元向第二会话管理网元发送IP地址。
示例性的，第一会话管理网元通过N16a接口向第二会话管理网元发送SMF服务化接口_PDU会话_更新请求(Nsmf_PDUSession_Update Request)消息，SMF服务化接口_PDU会话_更新请求消息包括终端设备的IP地址。
S350，第二会话管理网元向第二用户面网元发送IP地址。
第二会话管理网元向第二用户面网元发送终端设备的IP地址之后，第二用户面网元可以根据终端设备的IP地址建立会话#1在第二用户面网元与接入网设备之间的传输通道。第二用户面网元为终端设备建立会话#1在第二用户面网元与接入网设备之间的传输通道的更多描述可以参考下文方法500中的S511。
其中，第二用户面网元部署在DNN#1的签约地内，即第一会话管理网元从管理的多个用户面网元中选择与DNN#1对应的用户面网元作为第二用户面网元。第二用户面网元 可以称为辅锚点用户面网元。
第二会话管理网元可以通过PDU会话建立请求消息向第二用户面网元发送终端设备的IP地址。相应的，第二用户面网元建立会话#1之后，可以向第二会话管理网元发送PDU会话建立响应消息。
S360，第一会话管理网元向终端设备发送IP地址。
相应的，终端设备接收来自第一会话管理网元的IP地址。
终端设备接收到IP地址之后，可以根据IP地址建立会话#1在终端设备与接入网设备之间的传输通道。
S360可以参考上文方法200中的S250的描述。
在本申请实施例中，若终端设备移动至专用DNN签约地内的第二会话管理网元和用户面网元的服务区域之外，则第一会话管理网元请求第一用户面网元为终端设备分配IP地址。由于第一用户面网元覆盖终端设备的接入位置，因此，第一用户面网元为终端设备分配的IP地址与终端设备的接入位置相关，从而可以满足运营商基于IP地址实现基于地域的业务管理的需求。
下面结合图4，对本申请实施例提供的分配IP地址的方法进行说明。需要说明的是，图4中的UE是图2中所述终端设备的示例，AMF是图2中所述接入管理网元的示例，ULCL+PSA1是图2中所述第一用户面网元的示例，SMF是图2中所述第一会话管理网元的示例，PSA2是图2中所述第二用户面网元的示例，PCF是图2中所述策略控制网元的示例。
结合图2，图4示出了本申请实施例提供的分配IP地址的方法的示意性流程图。图4所示的方法400可以包括以下步骤：
S401，UE向AMF发送会话标识#1。
会话标识#1的描述可以参考上文方法200中的S210。
例如，UE通过PDU会话建立请求消息向AMF发送会话标识#1。
S402，AMF向SMF发送会话标识#1。
例如，AMF通过SMF服务化接口_PDU会话_创建会话管理上下文请求服务向SMF发送会话标识#1。
可选的，方法400还包括S403和S404。
S403，SMF向PCF发送会话标识#1。
例如，SMF通过PCF服务化接口_会话管理策略控制_创建请求服务向PCF发送会话标识#1。
S404，PCF向SMF发送分流策略。
分流策略是签约业务的分流策略，签约业务是UE通过会话标识#1所标识的会话访问的业务。分流策略的更多描述可以参考上文方法200中的S210。
可选的，分流策略包括会话标识#1对应的目标DNAI集合。关于目标DNAI集合的描述可以参考上文方法200中的S212a。
例如，PCF通过PCF服务化接口_会话管理策略控制_创建响应服务向SMF发送分流策略。
可选的，SMF接收到来自PCF的分流策略之后，还可以向AMF发送SMF服务化接 口_PDU会话_创建会话管理上下文响应服务。
S405，SMF获取会话标识#1对应的目标DNAI集合和UE的接入位置信息。
示例性的，SMF从分流策略中获取会话标识#1对应的目标DNAI集合。
示例性的，SMF根据分流策略和本地配置信息确定会话标识#1对应的目标DNAI集合。
示例性的，SMF中预配置会话标识#1对应的目标DNAI集合。
SMF获取目标DANI集合和UE的接入位置信息的更多描述可以参考上文方法200中的S210。
S406，SMF向ULCL+PSA1发送请求消息。
请求消息用于请求ULCL+PSA1为UE分配IP地址。
示例性的，SMF向ULCL+PSA1发送的请求消息是PDU会话建立请求消息。
ULCL+PSA1表示ULCL与PSA1合设的网元，ULCL+PSA1支持目标DNAI集合中的至少一个目标DNAI，且ULCL+PSA1的服务区域包括UE的接入位置，ULCL+PSA1还具有上行分流的功能。
需要说明的是，本申请实施例以PSA1与ULCL合设为例进行说明，PSA1与ULCL也可以独立部署。在PSA1与ULCL独立部署的情况下，在S406中，SMF向PSA1发送请求消息，PSA1支持目标DNAI集合中的至少一个目标DNAI，且PSA1的服务区域包括UE的接入位置。
S406的更多描述可以参考上文方法200中的S220。
S407，ULCL+PSA1向SMF发送IP地址。
ULCL+PSA1接收到来自SMF的请求消息之后，为UE分配IP地址，并向SMF发送为UE分配的IP地址。
例如，ULCL+PSA1通过PDU会话建立响应消息向SMF发送IP地址。
S408，SMF向AMF发送ULCL+PSA1的N3接口地址和IP地址。
例如，SMF通过发送AMF服务化接口_通信_N1N2消息转发消息向AMF发送IP地址和ULCL+PSA1的N3接口地址。AMF服务化接口_通信_N1N2消息转发消息包括N2会话管理(session management，SM)信息和N1SM容器(container)，N2SM信息包括ULCL+PSA1的N3接口地址，N1SM容器包括PDU会话建立接受消息，PDU会话建立接受消息包括UE的IP地址。
需要说明的是，在ULCL与PSA1独立部署的情况下，SMF根据UE的接入位置信息从管理的多个UPF中选择具备上行分流功能的UPF作为ULCL，并向AMF发送ULCL的N3接口地址和IP地址。SMF根据UE的接入位置信息选择的ULCL的服务区域覆盖UE的接入位置。
S409，AMF向RAN发送IP地址和ULCL+PSA1的N3接口地址。
例如，AMF通过PDU会话资源建立请求(PDU session resource setup request)消息向RAN发送IP地址和ULCL+PSA1的N3接口地址。例如，PDU会话资源建立请求消息包括N2SM信息和非接入层(non-access stratum，NAS)消息，N2SM信息包括ULCL+PSA1的N3接口地址，NAS消息包括N1SM容器，N1SM容器PDU会话建立接受消息，PDU会话建立接受消息包括UE的IP地址。
RAN接收到PDU会话资源建立请求消息之后，解析N2SM信息获得ULCL+PSA1的N3接口地址，并将N1SM容器转发给UE。RAN获得ULCL+PSA1的N3接口地址之后，可以根据ULCL+PSA1的N3接口地址建立RAN至ULCL+PSA1的上行N3隧道。基于该上行N3隧道，RAN可以将来自UE的上行数据包发送至ULCL+PSA1。
S410，RAN向UE发送IP地址。
例如，RAN向UE发送接入网特定资源建立(AN-specific resource setup)消息，接入网特定资源建立消息包括PDU会话建立接受消息，PDU会话建立接受消息包括UE的IP地址。
UE接收到接入网特定资源建立消息之后，根据接入网特定资源建立消息与RAN建立资源链接。
S411，RAN向AMF发送RAN的N3接口地址。
例如，RAN通过PDU会话资源建立响应(PDU session resource response)消息向AMF发送RAN的N3接口地址。PDU会话资源建立响应消息包括N2容器，N2容器包括RAN的N3接口地址。
S412，AMF向SMF发送RAN的N3接口地址。
例如，AMF通过SMF服务化接口_PDU会话_更新会话管理上下文请求(Nsmf_PDUSession_UpdateSMContext Request)消息向SMF发送RAN的N3接口地址。SMF服务化接口_PDU会话_更新会话管理上下文请求消息包括N2容器，N2容器包括RAN的N3接口地址。
S413，SMF向ULCL+PSA1发送RAN的N3接口地址。
例如，SMF通过PDU会话修改请求(PDU session modification request)消息向ULCL+PSA1发送RAN的N3接口地址。
ULCL+PSA1接收到RAN的N3接口地址之后，可以根据RAN的N3接口地址建立ULCL+PSA1至RAN的下行N3隧道。基于该下行N3隧道，ULCL+PSA1可以将发送给UE的下行数据包发送至RAN。
需要说明的是，若ULCL与PSA1独立部署，则SMF根据UE的接入位置信息从管理的多个UPF中选择具备上行分流功能的UPF作为ULCL，并向ULCL发送RAN的N3接口地址。
可选的，ULCL+PSA1接收到RAN的N3接口地址之后，还可以向SMF发送PDU会话修改响应(PDU session modification response)消息。
S414，SMF向PSA2发送IP地址和ULCL+PSA1的N9接口地址。
PSA2接收到ULCL+PSA1的N9接口地址之后，可以根据ULCL+PSA1的N9接口地址建立PSA2至ULCL+PSA1的N9隧道。基于该N9隧道，PSA2可以将发送给UE的下行数据包发送至ULCL+PSA1。
例如，SMF通过PDU会话建立请求消息向PSA2发送UE的IP地址和ULCL+PSA1的N9接口地址。
可选的，PSA2接收到UE的IP地址和ULCL+PSA1的N9接口地址之后，还可以向SMF发送PDU会话建立响应消息。
需要说明的是，在ULCL与PSA1独立部署的情况下，SMF向PSA2发送ULCL的 N9接口地址。
S415，SMF向ULCL+PSA1发送分流规则和转发规则。
SMF根据从PCF接收的分流策略向ULCL+PSA1发送分流规则，以及根据PSA2的N9接口地址向ULCL+PSA1发送转发规则。分流规则用于指示ULCL+PSA1对签约业务进行分流，分流规则包括签约业务的业务信息，业务信息包括业务的全量域名、业务的IP五元组描述信息等。IP五元组描述信息可以为：源IP地址、目的IP地址、源端口号、目的端口号和协议类型。转发规则包括PSA2的N9接口地址，转发规则用于指示ULCL+PSA1将匹配分流规则的上行数据包转发至PSA2的N9接口。
ULCL+PSA1接收到PSA2的N9接口地址之后，可以根据PSA2的N9接口地址建立ULCL+PSA1至PSA2的N9隧道。基于该N9隧道，ULCL+PSA1可以将匹配分流规则的上行数据包发送至PSA2。
例如，SMF通过PDU会话修改请求消息向ULCL+PSA1发送分流规则和转发规则。
可选的，ULCL+PSA1接收到分流规则和转发规则之后，还可以向SMF发送PDU会话修改响应消息。
需要说明的是，若ULCL与PSA1独立部署，则SMF根据UE的接入位置信息从管理的多个UPF中选择具备上行分流功能的UPF作为ULCL，并向ULCL发送分流规则和转发规则。
基于以上设计，若UE请求访问专用DNN的签约业务，访问请求经过ULCL+PSA1时能匹配签约业务的分流规则，然后ULCL+PSA1通过ULCL+PSA1与PSA2之间的N9隧道将访问请求转发至PSA2，进而PSA2通过PSA2的N6接口将访问请求转发到专用DNN签约地的DN。若PSA2接收到来自专用DNN签约地的DN的下行数据包，下行数据包的目的地址是UE的IP地址，则PSA2通过PSA2至ULCL+PSA1的N9隧道将下行数据包发送至ULCL+PSA1。然后ULCL+PSA1通过ULCL+PSA1至RAN的N3隧道将下行数据包发送至RAN，RAN将下行数据包发送至UE。
若UE请求访问公网业务，访问请求经过ULCL+PSA1时不能匹配上分流规则，然后ULCL+PSA1将访问请求通过N6接口转发到公网对应的DN。若ULCL+PSA1接收到来自公网对应的DN的下行数据包，下行数据包的目的地址是UE的IP地址，则ULCL+PSA1通过ULCL+PSA1至RAN的N3隧道将下行数据包发送至RAN，RAN将下行数据包发送至UE。
应理解，图4所示的方法中，各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
在本申请实施例中，若UE移动至专用DNN签约地内的UPF(即PSA2)的服务区域之外，则SMF请求ULCL+PSA1为终端设备分配IP地址。由于ULCL+PSA1覆盖UE的接入位置，因此，ULCL+PSA1为UE分配的IP地址与UE的接入位置相关，从而可以满足运营商基于IP地址实现基于地域的业务管理的需求。
下面结合图5，对本申请实施例提供的分配IP地址的方法进行说明。需要说明的是，图5中的UE是图3中所述终端设备的示例，AMF是图3中所述接入管理网元的示例，ULCL+PSA1是图3中所述第一用户面网元的示例，I-SMF是图3中所述第一会话管理网 元的示例，H-SMF是图3中所述第二会话管理网元的示例，PSA2是图3中所述第二用户面网元的示例。
结合图3，图5示出了本申请实施例提供的分配IP地址的方法的示意性流程图。图5所述的方法500包括以下步骤：
S501，UE向AMF发送会话标识#1。
会话标识#1的描述可以参考上文方法200中的S210。
例如，UE通过PDU会话建立请求消息向AMF发送会话标识#1。
S502，AMF向I-SMF发送会话标识#1。
例如，AMF通过SMF服务化接口_PDU会话_创建会话管理上下文请求服务向I-SMF发送会话标识#1。
S503，I-SMF与I-UPF创建会话。
I-SMF基于UE的接入位置选择I-UPF，并与I-UPF创建会话。
例如，I-SMF向I-UPF发送PDU会话建立请求消息。相应的，I-UPF向I-SMF发送PDU会话建立响应消息。
S504，I-SMF向H-SMF发送会话标识#1和I-SMF支持的DNAI。
S504的更多描述可以参考上文方法300中的S311a。
可选的，方法500还包括S505和S506。
S505，H-SMF向PCF发送会话标识#1。
例如，H-SMF通过PCF服务化接口_会话管理策略控制_创建请求服务向PCF发送会话标识#1。
S506，PCF向H-SMF发送分流策略。
分流策略是签约业务的分流策略，签约业务是UE通过会话标识#1所标识的会话访问的业务。分流策略的更多描述可以参考上文方法200中的S210。
可选的，分流策略包括会话标识#1对应的DNAI。
例如，PCF通过PCF服务化接口_会话管理策略控制_创建响应服务向H-SMF发送分流策略。
S507，H-SMF向I-SMF发送目标DNAI集合。
目标DNAI集合是会话标识#1对应的DNAI和I-SMF支持的DNAI的交集。
可选的，H-SMF还可以向I-SMF发送指示信息#1。
S507的更多描述可以参考上文方法300中的S312a。
S508，I-SMF向ULCL+PSA1发送请求消息。
请求消息用于请求ULCL+PSA1为UE分配IP地址。ULCL+PSA1的描述可以参考上文方法400中的S406。
示例性的，I-SMF向ULCL+PSA1发送的请求消息是PDU会话建立请求消息。
需要说明的是，本申请实施例以PSA1与ULCL合设为例进行说明，PSA1与ULCL也可以独立部署。在PSA1与ULCL独立部署的情况下，在S508中，I-SMF向PSA1发送请求消息，PSA1支持目标DNAI集合中的至少一个目标DNAI，且PSA1的服务区域包括UE的接入位置。
还需要说明的是，I-UPF与ULCL+PSA1可以独立部署，也可以合设，本申请实施例 以I-UPF与ULCL+PSA1独立部署为例进行说明。
S508的更多描述可以参考上文方法200中的S220。
S509，ULCL+PSA1向I-SMF发送IP地址。
ULCL+PSA1接收到来自I-SMF的请求消息之后，为UE分配IP地址，并向I-SMF发送为UE分配的IP地址。
例如，ULCL+PSA1通过PDU会话建立响应消息向I-SMF发送IP地址。
S510，I-SMF向H-SMF发送IP地址和ULCL+PSA1的N9接口地址。
例如，I-SMF通过N16a接口向H-SMF发送SMF服务化接口_PDU会话_更新请求消息，SMF服务化接口_PDU会话_更新请求消息包括IP地址和ULCL+PSA1的N9接口地址。
需要说明的是，在ULCL与PSA1独立部署的情况下，I-SMF根据UE的接入位置信息从管理的多个UPF中选择具备上行分流功能的UPF作为ULCL，并向H-SMF发送ULCL的N9接口地址和IP地址。I-SMF根据UE的接入位置信息选择的ULCL的服务区域覆盖UE的接入位置。
S511，H-SMF向PSA2发送IP地址和ULCL+PSA1的N9接口地址。
PSA2接收到ULCL+PSA1的N9接口地址之后，可以根据ULCL+PSA1的N9接口地址建立PSA2至ULCL+PSA1的N9隧道。基于该N9隧道，PSA2可以将发送给UE的下行数据包发送至ULCL+PSA1。
例如，H-SMF通过PDU会话建立请求消息向PSA2发送IP地址和ULCL+PSA2的N9接口地址。
可选的，PSA2接收到UE的IP地址和ULCL+PSA1的N9接口地址之后，还可以向SMF发送PDU会话建立响应消息。
又例如，若H-SMF与PSA2已经创建了会话，则H-SMF通过PDU会话修改请求消息向PSA2发送IP地址和ULCL+PSA2的N9接口地址。
可选的，PSA2接收到UE的IP地址和ULCL+PSA1的N9接口地址之后，还可以向SMF发送PDU会话修改响应消息。
S512，H-SMF向I-SMF发送分流规则和转发规则。
H-SMF根据从PCF接收的分流策略向I-SMF发送分流规则，以及根据PSA2的N9接口地址向I-SMF发送转发规则。分流规则的描述可以参考上文方法400中的S415。转发规则包括PSA2的N9接口地址，转发规则用于指示将匹配分流规则的上行数据包转发至PSA2的N9接口。
S513，I-SMF向AMF发送IP地址。
可选的，在I-UPF与ULCL+PSA1独立部署的情况下，I-SMF还向AMF发送ULCL+PSA1的N3接口地址。
S514，AMF向RAN发送IP地址。
可选的，若AMF接收到ULCL+PSA1的N3接口地址，则AMF还向RAN发送ULCL+PSA1的N3接口地址。
S515，RAN向UE发送IP地址。
S516，RAN向AMF发送RAN的N3接口地址。
S517，AMF向I-SMF发送RAN的N3接口地址。
S513至S517参考上文方法400中的S408至S412的描述。
S518，I-SMF向ULCL+PSA1发送RAN的N3接口地址、分流规则和转发规则。
例如，SMF通过PDU会话修改请求消息向ULCL+PSA1发送RAN的N3接口地址、分流规则和转发规则。分流规则和转发规则的描述可以参考上文方法400中的S415。
ULCL+PSA1接收到RAN的N3接口地址之后，可以根据RAN的N3接口地址建立ULCL+PSA1至RAN的下行N3隧道。基于该下行N3隧道，ULCL+PSA1可以将发送给UE的下行数据包发送至RAN。
ULCL+PSA1接收到PSA2的N9接口地址之后，可以根据PSA2的N9接口地址建立ULCL+PSA1至PSA2的N9隧道。基于该N9隧道，ULCL+PSA1可以将匹配分流规则的上行数据包发送至PSA2。
需要说明的是，若ULCL与PSA1独立部署，则I-SMF根据UE的接入位置信息从管理的多个UPF中选择具备上行分流功能的UPF作为ULCL，并向ULCL发送RAN的N3接口地址、分流规则和转发规则。
可选的，ULCL+PSA1接收到RAN的N3接口地址、分流规则和转发之后，还可以向SMF发送PDU会话修改响应消息。
基于以上设计，若UE请求访问专用DNN的签约业务，访问请求经过ULCL+PSA1时能匹配签约业务的分流规则，然后ULCL+PSA1通过ULCL+PSA1与PSA2之间的N9隧道将访问请求转发PSA2，PSA2通过PSA2的N6接口将访问请求转发到专用DNN签约地的DN。若PSA2接收到来自专用DNN签约地的DN的下行数据包，下行数据包的目的地址是UE的IP地址，则PSA2通过PSA2至ULCL+PSA1的N9隧道将下行数据包发送至ULCL+PSA1。然后ULCL+PSA1通过ULCL+PSA1至RAN的N3隧道将下行数据包发送至RAN，RAN将下行数据包发送至UE。
若UE请求访问公网业务，访问请求经过ULCL+PSA1时不能匹配上分流规则，然后ULCL+PSA1将访问请求通过N6接口路由到公网对应的DN。若ULCL+PSA1接收到来自公网对应的DN的下行数据包，下行数据包的目的地址是UE的IP地址，则ULCL+PSA1通过ULCL+PSA1至RAN的N3隧道将下行数据包发送至RAN，RAN将下行数据包发送至UE。
应理解，图5所示的方法中，各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
在本申请实施例中，若UE移动至专用DNN签约地内的SMF(即H-SMF)的服务区域之外，则I-SMF请求ULCL+PSA1为终端设备分配IP地址。由于ULCL+PSA1覆盖UE的接入位置，因此，ULCL+PSA1为UE分配的IP地址与UE的接入位置相关，从而可以满足运营商基于IP地址实现基于地域的业务管理的需求。
以上结合图2至图5详细说明了本申请实施例提供的方法。以下，结合图6至图8详细说明本申请实施例提供的通信装置。应理解，装置实施例的描述与方法实施例的描述相互对应，因此，未详细描述的内容可以参见上文方法实施例，为了简洁，这里不再赘述。
图6是本申请实施例提供的通信装置1000的示意性框图。如图6所示，该通信装置 1000可以包括：收发单元1010和处理单元1020。
在一种可能的设计中，该通信装置1000可以是上文方法实施例中的第一会话管理网元，也可以是用于实现上文方法实施例中第一会话管理网元的功能的芯片。
应理解，该通信装置1000可对应于本申请实施例方法200或方法300中的第一会话管理网元，或者，对应于方法400中的SMF，或者，对应于方法500中的I-SMF，该通信装置1000可以包括用于执行图2中的方法200或图3中的方法300中的第一会话管理网元执行的方法的单元，或者可以包括用于执行图4中的方法400中的SMF执行的方法的单元，或者可以包括用于执行图5中的方法500中的I-SMF执行的方法的单元。并且，该通信装置1000中的各单元和上述其他操作和/或功能分别为了实现图2中的方法200、图3中的方法300、图4中的方法400或图5中的方法500的相应流程。应理解，各单元执行上述相应步骤的具体过程在上述方法实施例中已经详细说明，为了简洁，在此不再赘述。
在另一种可能的设计中，该通信装置1000可以是上文方法实施例中的第二会话管理网元，也可以是用于实现上文方法实施例中第二会话管理网元的功能的芯片。
应理解，该通信装置1000可对应于本申请实施例方法300中的第二会话管理网元，或者，对应于方法500中的H-SMF，该通信装置1000可以包括用于执行图3中的方法300的第二会话管理网元执行的方法的单元，或者可以包括用于执行图5中的方法500中的H-SMF执行的方法的单元。并且，该通信装置1000中的各单元和上述其他操作和/或功能分别为了实现图3中的方法300或图5中的方法500的相应流程。应理解，各单元执行上述相应步骤的具体过程在上述方法实施例中已经详细说明，为了简洁，在此不再赘述。
在另一种可能的设计中，该通信装置1000可以是上文方法实施例中的第二用户面网元，也可以是用于实现上文方法实施例中第二用户面网元的功能的芯片。
应理解，该通信装置1000对应于本申请实施例方法200或方法300中的第二用户面网元，或者，对应于方法400或方法500中的PSA2，该通信装置1000可以包括用于执行图2中的方法200或图3中的方法300中的第二用户面网元执行的方法的单元，或者可以包括用于执行图4中的方法400或图5中的方法500中的PSA2执行的方法的单元。并且，该通信装置1000中的各单元和上述其他操作和/或功能分别为了实现图2中的方法200、图3中的方法300、图4中的方法400或图5中的方法500的相应流程。应理解，各单元执行上述相应步骤的具体过程在上述方法实施例中已经详细说明，为了简洁，在此不再赘述。
还应理解，该通信装置1000中的收发单元1010可对应于图7中示出的装置2000中的收发器2020，该通信装置1000中的处理单元1020可对应于图7中示出的装置2000中的处理器2010。
还应理解，当该通信装置1000为芯片时，该芯片包括收发单元。可选的，该芯片还可以包括处理单元。其中，收发单元可以是输入输出电路或通信接口；处理单元可以为该芯片上集成的处理器或者微处理器或者集成电路。
收发单元1010用于实现通信装置1000的信号的收发操作，处理单元1020用于实现通信装置1000的信号的处理操作。可选的，收发单元1010组成获取单元，或者说收发单元1010可以称为获取单元。可选的，收发单元1010和处理单元1020组成获取单元。
可选的，该通信装置1000还包括存储单元1030，该存储单元1030用于存储指令。
图7是本申请实施例提供的装置2000的示意性框图。如图7所示，该装置2000包括：至少一个处理器2010。该处理器2010与存储器耦合，用于执行存储器中存储的指令，以执行图2、图3、图4或图5所述的方法。可选的，该装置2000还包括收发器2020，该处理器2010与存储器耦合，用于执行存储器中存储的指令，以控制收发器2020发送信号和/或接收信号，例如，处理器2010可以控制收发器2020发送IP地址和/或接收IP地址。可选的，该装置2000还包括存储器2030，用于存储指令。
应理解，上述处理器2010和存储器2030可以合成一个处理装置，处理器2010用于执行存储器2030中存储的程序代码来实现上述功能。具体实现时，该存储器2030也可以集成在处理器2010中，或者独立于处理器2010。
还应理解，收发器2020可以包括接收器(或者称，接收机)和发射器(或者称，发射机)。收发器2020还可以进一步包括天线，天线的数量可以为一个或多个。收发器2020又可以是通信接口或者接口电路。
当该装置2000为芯片时，该芯片包括收发单元和处理单元。其中，收发单元可以是输入输出电路或通信接口；处理单元可以为该芯片上集成的处理器或者微处理器或者集成电路。
图8是本申请实施例的一种芯片系统的示意图。这里的芯片系统也可为电路组成的系统。图8所示的芯片系统3000包括：逻辑电路3010以及输入/输出接口(input/output interface)3020，所述逻辑电路用于与输入接口耦合，通过所述输入/输出接口传输数据(例如IP地址)，以执行图2、图3、图4或图5所述的方法。
本申请实施例还提供了一种处理装置，包括处理器和接口。所述处理器可用于执行上述方法实施例中的方法。
应理解，上述处理装置可以是一个芯片。例如，该处理装置可以是现场可编程门阵列(field programmable gate array，FPGA)，可以是专用集成芯片(application specific integrated circuit，ASIC)，还可以是系统芯片(system on chip，SoC)，还可以是中央处理器(central processor unit，CPU)，还可以是网络处理器(network processor，NP)，还可以是数字信号处理电路(digital signal processor，DSP)，还可以是微控制器(micro controller unit，MCU)，还可以是可编程控制器(programmable logic device，PLD)或其他集成芯片。
在实现过程中，上述方法的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。结合本申请实施例所公开的方法的步骤可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机寄存器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器，处理器读取存储器中的信息，结合其硬件完成上述方法的步骤。为避免重复，这里不再详细描述。
应注意，本申请实施例中的处理器可以是一种集成电路芯片，具有信号的处理能力。在实现过程中，上述方法实施例的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。上述的处理器可以是通用处理器、数字信号处理器(DSP)、专用集成电路(ASIC)、现场可编程门阵列(FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件。可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。
可以理解，本申请实施例中的存储器可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(read-only memory，ROM)、可编程只读存储器(programmable ROM，PROM)、可擦除可编程只读存储器(erasable PROM，EPROM)、电可擦除可编程只读存储器(electrically EPROM，EEPROM)或闪存。易失性存储器可以是随机存取存储器(random access memory，RAM)，其用作外部高速缓存。
根据本申请实施例提供的方法，本申请还提供一种计算机程序产品，该计算机程序产品包括：计算机程序代码，当该计算机程序代码在计算机上运行时，使得该计算机执行图2至图5所示实施例中任意一个实施例的方法。
根据本申请实施例提供的方法，本申请还提供一种计算机可读介质，该计算机可读介质存储有程序代码，当该程序代码在计算机上运行时，使得该计算机执行图2至图5所示实施例中任意一个实施例的方法。
根据本申请实施例提供的方法，本申请还提供一种系统，该系统包括前述的第一会话管理网元和第一用户面网元。可选的，该系统还包括前述的第二会话管理网元。可选的，该系统还包括前述的第二用户面网元。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现，当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机指令时，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信息介质向另一个计算机可读存储介质传输。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，高密度数字视频光盘(digital video disc，DVD))、或者半导体介质(例如，固态硬盘(solid state disc，SSD))等。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其他的形式。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (34)

  1. 一种分配互联网协议地址的方法，其特征在于，包括：
    第一会话管理网元获取终端设备的会话标识对应的目标数据网络接入标识DNAI集合和所述终端设备的接入位置信息，所述接入位置信息用于指示所述终端设备的接入位置，所述接入位置位于所述终端设备签约的专用数据网络名称DNN的签约地之外，所述会话标识用于标识所述终端设备请求激活的会话；
    所述第一会话管理网元根据所述目标DNAI集合和所述接入位置信息向第一用户面网元发送请求消息，所述请求消息用于请求为所述终端设备分配互联网协议IP地址，所述第一用户面网元支持所述目标DNAI集合中的至少一个目标DNAI，且所述第一用户面网元的服务区域包括所述接入位置；
    所述第一会话管理网元接收来自所述第一用户面网元的所述终端设备的IP地址。
  2. 根据权利要求1所述的方法，其特征在于，所述第一会话管理网元部署在所述专用DNN的签约地，所述第一会话管理网元获取所述目标DNAI集合，包括：
    所述第一会话管理网元向策略控制网元发送所述会话标识；
    所述第一会话管理网元接收来自所述策略控制网元的所述目标DNAI集合。
  3. 根据权利要求1所述的方法，其特征在于，所述第一会话管理网元部署在所述专用DNN的签约地，所述第一会话管理网元获取所述目标DNAI集合，包括：
    所述第一会话管理网元向策略控制网元发送所述会话标识；
    所述第一会话管理网元接收来自所述策略控制网元的分流策略，所述分流策略是所述会话对应的签约业务的分流策略；
    所述第一会话管理网元根据所述分流策略确定所述目标DNAI集合。
  4. 根据权利要求2或3所述的方法，其特征在于，所述方法还包括：
    所述第一会话管理网元向第二用户面网元发送所述IP地址，所述第二用户面网元部署在所述专用DNN的签约地，所述第二用户面网元用于根据所述IP地址为所述终端设备建立所述会话；
    所述第一会话管理网元通过接入管理网元向所述终端设备发送所述IP地址。
  5. 根据权利要求1所述的方法，其特征在于，所述第一会话管理网元部署在所述专用DNN的签约地之外，所述第一会话管理网元获取所述目标DNAI集合，包括：
    所述第一会话管理网元向第二会话管理网元发送所述会话标识和所述第一会话管理网元支持的DNAI，所述第二会话管理网元部署在所述专用DNN的签约地；
    所述第一会话管理网元接收来自所述第二会话管理网元的所述目标DNAI集合，所述目标DNAI集合包括所述会话标识对应的DNAI与所述第一会话管理网元支持的DNAI的交集。
  6. 根据权利要求1所述的方法，其特征在于，所述第一会话管理网元部署在所述专用DNN的签约地之外，所述第一会话管理网元获取所述目标DNAI集合，包括：
    所述第一会话管理网元向第二会话管理网元发送所述会话标识，所述第二会话管理网元部署在所述专用DNN的签约地；
    所述第一会话管理网元接收来自所述第二会话管理网元的所述会话标识对应的DNAI；
    所述第一会话管理网元确定所述目标DNAI集合包括所述会话标识对应的DNAI与所述第一会话管理网元支持的DNAI的交集。
  7. 根据权利要求5或6所述的方法，其特征在于，所述方法还包括：
    所述第一会话管理网元接收来自所述第二会话管理网元的指示信息，所述指示信息用于指示由目标用户面网元为所述终端设备分配IP地址，所述目标用户面网元是根据所述会话标识对应的DNAI与所述第一会话管理网元支持的DNAI的交集选择的；
    所述第一会话管理网元根据所述目标DNAI集合和所述接入位置信息向第一用户面网元发送请求消息，包括：
    所述第一会话管理网元根据所述指示信息和所述目标DNAI集合，确定支持所述目标DNAI集合中的至少一个目标DNAI的至少一个所述目标用户面网元；
    所述第一会话管理网元根据所述接入位置信息，从所述至少一个所述目标用户面网元中确定所述第一用户面网元，所述第一用户面网元的服务区域包括所述接入位置；
    所述第一会话管理网元向所述第一用户面网元发送所述请求消息。
  8. 根据权利要求5至7中任一项所述的方法，其特征在于，所述方法还包括：
    所述第一会话管理网元向所述第二会话管理网元发送所述IP地址；
    所述第一会话管理网元通过接入管理网元向所述终端设备发送所述IP地址。
  9. 一种分配互联网协议地址的方法，其特征在于，包括：
    第二会话管理网元接收来自第一会话管理网元的会话标识和所述第一会话管理网元支持的数据网络接入标识DNAI，所述会话标识用于标识终端设备请求激活的会话，所述第二会话管理网元部署在所述终端设备签约的专用数据网络名称DNN的签约地，所述第一会话管理网元部署在所述签约地之外；
    所述第二会话管理网元向所述第一会话管理网元发送所述会话标识对应的目标DNAI集合，所述目标DNAI集合包括所述会话标识对应的DNAI与所述第一会话管理网元支持的DNAI的交集；
    所述第二会话管理网元接收来自所述第一会话管理网元的所述终端设备的互联网协议IP地址，所述IP地址是第一用户面网元为所述终端设备分配的，所述第一用户面网元支持所述目标DNAI集合中的至少一个目标DNAI，且所述第一用户面网元的服务区域包括所述终端设备的接入位置，所述终端设备的接入位置位于所述签约地之外。
  10. 一种分配互联网协议地址的方法，其特征在于，包括：
    第二会话管理网元接收来自第一会话管理网元的会话标识，所述会话标识用于标识终端设备请求激活的会话，所述第二会话管理网元部署在所述终端设备签约的专用数据网络名称DNN的签约地，所述第一会话管理网元部署在所述签约地之外；
    所述第二会话管理网元向所述第一会话管理网元发送所述会话标识对应的数据网络接入标识DNAI；
    所述第二会话管理网元接收来自所述第一会话管理网元的所述终端设备的互联网协议IP地址，所述IP地址是第一用户面网元为所述终端设备分配的，所述第一用户面网元支持所述会话标识对应的目标DNAI集合中的至少一个目标DNAI，且所述第一用户面网元的服务区域包括所述终端设备的接入位置，所述目标DNAI集合包括所述会话标识对应 的DNAI与所述第一会话管理网元支持的DNAI的交集，所述终端设备的接入位置位于所述签约地之外。
  11. 根据权利要求9或10所述的方法，其特征在于，所述方法还包括：
    所述第二会话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由目标用户面网元为所述终端设备分配IP地址，所述目标用户面网元是根据所述会话标识对应的DNAI与所述第一会话管理网元支持的DNAI的交集选择的，所述第一用户面网元是至少一个所述目标用户面网元中服务区域包括所述接入位置的所述目标用户面网元。
  12. 根据权利要求9至11中任一项所述的方法，其特征在于，所述方法还包括：
    所述第二会话管理网元向第二用户面网元发送所述IP地址，所述第二用户面网元部署在所述专用DNN的签约地，所述第二用户面网元用于根据所述IP地址为所述终端设备建立所述会话。
  13. 一种通信装置，其特征在于，包括获取单元和收发单元，
    所述获取单元用于获取终端设备的会话标识对应的目标数据网络接入标识DNAI集合和所述终端设备的接入位置信息，所述接入位置信息用于指示所述终端设备的接入位置，所述接入位置位于所述终端设备签约的专用数据网络名称DNN的签约地之外，所述会话标识用于标识所述终端设备请求激活的会话；
    所述收发单元用于根据所述目标DNAI集合和所述接入位置信息向第一用户面网元发送请求消息，所述请求消息用于请求为所述终端设备分配互联网协议IP地址，所述第一用户面网元支持所述目标DNAI集合中的至少一个目标DNAI，且所述第一用户面网元的服务区域包括所述接入位置；
    所述收发单元还用于接收来自所述第一用户面网元的所述终端设备的IP地址。
  14. 根据权利要求13所述的通信装置，其特征在于，所述获取单元包括所述收发单元，
    所述收发单元还用于向策略控制网元发送所述会话标识；
    所述收发单元还用于接收来自所述策略控制网元的所述目标DNAI集合。
  15. 根据权利要求13所述的通信装置，其特征在于，所述获取单元包括所述收发单元和处理单元，
    所述收发单元还用于向策略控制网元发送所述会话标识；
    所述收发单元还用于接收来自所述策略控制网元的分流策略，所述分流策略是所述会话对应的签约业务的分流策略；
    所述处理单元用于根据所述分流策略确定所述目标DNAI集合。
  16. 根据权利要求14或15所述的通信装置，其特征在于，所述收发单元还用于向第二用户面网元发送所述IP地址，所述第二用户面网元部署在所述专用DNN的签约地，所述第二用户面网元用于根据所述IP地址为所述终端设备建立所述会话；
    所述收发单元还用于通过接入管理网元向所述终端设备发送所述IP地址。
  17. 根据权利要求13所述的通信装置，其特征在于，所述获取单元包括所述收发单元，
    所述收发单元还用于向第二会话管理网元发送所述会话标识和第一会话管理网元支 持的DNAI，所述第二会话管理网元部署在所述专用DNN的签约地；
    所述收发单元还用于接收来自所述第二会话管理网元的所述目标DNAI集合，所述目标DNAI集合包括所述会话标识对应的DNAI与所述第一会话管理网元支持的DNAI的交集。
  18. 根据权利要求13所述的通信装置，其特征在于，所述获取单元包括所述收发单元和处理单元，
    所述收发单元还用于向第二会话管理网元发送所述会话标识，所述第二会话管理网元部署在所述专用DNN的签约地；
    所述收发单元还用于接收来自所述第二会话管理网元的所述会话标识对应的DNAI；
    所述处理单元用于确定所述目标DNAI集合包括所述会话标识对应的DNAI与第一会话管理网元支持的DNAI的交集。
  19. 根据权利要求17或18所述的通信装置，其特征在于，所述收发单元还用于接收来自所述第二会话管理网元的指示信息，所述指示信息用于指示由目标用户面网元为所述终端设备分配IP地址，所述目标用户面网元是根据所述会话标识对应的DNAI与所述第一会话管理网元支持的DNAI的交集选择的；
    所述处理单元还用于根据所述指示信息和所述目标DNAI集合，确定支持所述目标DNAI集合中的至少一个目标DNAI的至少一个所述目标用户面网元；
    所述处理单元还用于根据所述接入位置信息，从所述至少一个所述目标用户面网元中确定所述第一用户面网元，所述第一用户面网元的服务区域包括所述接入位置；
    所述收发单元还用于向所述第一用户面网元发送所述请求消息。
  20. 根据权利要求17至19中任一项所述的通信装置，其特征在于，所述收发单元还用于向所述第二会话管理网元发送所述IP地址；
    所述收发单元还用于通过接入管理网元向所述终端设备发送所述IP地址。
  21. 一种通信装置，其特征在于，包括收发单元，
    所述收发单元用于接收来自第一会话管理网元的会话标识和所述第一会话管理网元支持的数据网络接入标识DNAI，所述会话标识用于标识终端设备请求激活的会话，所述通信装置部署在所述终端设备签约的专用数据网络名称DNN的签约地，所述第一会话管理网元部署在所述签约地之外；
    所述收发单元还用于向所述第一会话管理网元发送所述会话标识对应的目标DNAI集合，所述目标DNAI集合包括所述会话标识对应的DNAI与所述第一会话管理网元支持的DNAI的交集；
    所述收发单元还用于接收来自所述第一会话管理网元的所述终端设备的互联网协议IP地址，所述IP地址是第一用户面网元为所述终端设备分配的，所述第一用户面网元支持所述目标DNAI集合中的至少一个目标DNAI，且所述第一用户面网元的服务区域包括所述终端设备的接入位置，所述终端设备的接入位置位于所述签约地之外。
  22. 一种通信装置，其特征在于，包括收发单元，
    所述收发单元用于接收来自第一会话管理网元的会话标识，所述会话标识用于标识终端设备请求激活的会话，所述通信装置部署在所述终端设备签约的专用数据网络名称DNN的签约地，所述第一会话管理网元部署在所述签约地之外；
    所述收发单元还用于向所述第一会话管理网元发送所述会话标识对应的数据网络接入标识DNAI；
    所述收发单元还用于接收来自所述第一会话管理网元的所述终端设备的互联网协议IP地址，所述IP地址是第一用户面网元为所述终端设备分配的，所述第一用户面网元支持所述会话标识对应的目标DNAI集合中的至少一个目标DNAI，且所述第一用户面网元的服务区域包括所述终端设备的接入位置，所述目标DNAI集合包括所述会话标识对应的DNAI与所述第一会话管理网元支持的DNAI的交集，所述终端设备的接入位置位于所述签约地之外。
  23. 根据权利要求21或22所述的通信装置，其特征在于，所述收发单元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由目标用户面网元为所述终端设备分配IP地址，所述目标用户面网元是根据所述会话标识对应的DNAI与所述第一会话管理网元支持的DNAI的交集选择的，所述第一用户面网元是至少一个所述目标用户面网元中服务区域包括所述接入位置的所述目标用户面网元。
  24. 根据权利要求21至23中任一项的通信装置，其特征在于，所述收发单元还用于向第二用户面网元发送所述IP地址，所述第二用户面网元部署在所述专用DNN的签约地，所述第二用户面网元用于根据所述IP地址为所述终端设备建立所述会话。
  25. 一种通信装置，其特征在于，包括至少一个处理器，所述至少一个处理器用于与存储器耦合，读取并执行所述存储器中的指令，以实现如权利要求1至8中任一项所述的方法，或者以实现如权利要求9至12中任一项所述的方法。
  26. 根据权利要求25所述的通信装置，其特征在于，还包括所述存储器。
  27. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质上存储有计算机程序，所述计算机程序被执行时，以使得如权利要求1至8中任一项所述的方法被执行，或者以使得如权利要求9至12中任一项所述的方法被执行。
  28. 一种包含指令的计算机程序产品，其特征在于，当所述计算机程序产品在计算机上运行时，使得所述计算机执行如权利要求1至8中任一项所述的方法，或者执行如权利要求9至12中任一项所述的方法。
  29. 一种系统，其特征在于，所述系统包括第一会话管理网元和第一用户面网元，所述第一会话管理网元用于执行如权利要求1至8中任一项所述的方法。
  30. 根据权利要求29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，所述会话管理网元用于执行如权利要求9至12中任一项所述的方法。
  31. 一种分配互联网协议地址的方法，其特征在于，包括：
    第一会话管理网元向策略控制网元发送终端设备的会话标识，所述会话标识用于标识所述终端设备请求激活的会话；
    所述策略控制网元向所述第一会话管理网元发送目标数据网络接入标识DNAI集合，所述目标DNAI集合与所述会话标识对应；
    所述第一会话管理网元根据所述目标DNAI集合和所述终端设备的接入位置信息向第一用户面网元发送请求消息，所述请求消息用于请求为所述终端设备分配互联网协议IP地址，所述第一用户面网元支持所述目标DNAI集合中的至少一个目标DNAI，且所述第一用户面网元的服务区域包括所述接入位置，所述接入位置信息用于指示所述终端设备的 接入位置，所述接入位置位于所述终端设备签约的专用数据网络名称DNN的签约地之外；
    所述第一用户面网元向所述第一会话管理网元发送所述终端设备的IP地址。
  32. 一种分配互联网协议地址的方法，其特征在于，包括：
    第一会话管理网元向策略控制网元发送终端设备的会话标识，所述会话标识用于标识所述终端设备请求激活的会话；
    所述策略控制网元向所述第一会话管理网元发送分流策略，所述分流策略是所述会话对应的签约业务的分流策；
    所述第一会话管理网元根据所述分流策略确定目标数据网络接入标识DNAI集合，所述目标DNAI集合与所述会话标识对应；
    所述第一会话管理网元根据所述目标DNAI集合和所述终端设备的接入位置信息向第一用户面网元发送请求消息，所述请求消息用于请求为所述终端设备分配互联网协议IP地址，所述第一用户面网元支持所述目标DNAI集合中的至少一个目标DNAI，且所述第一用户面网元的服务区域包括所述接入位置，所述接入位置信息用于指示所述终端设备的接入位置，所述接入位置位于所述终端设备签约的专用数据网络名称DNN的签约地之外；
    所述第一用户面网元向所述第一会话管理网元发送所述终端设备的IP地址。
  33. 一种分配互联网协议地址的方法，其特征在于，包括：
    第一会话管理网元向第二会话管理网元发送会话标识和所述第一会话管理网元支持的数据网络接入标识DNAI，所述会话标识用于标识终端设备请求激活的会话，所述第二会话管理网元部署在所述终端设备签约的专用数据网络名称DNN的签约地，所述第一会话管理网元部署在所述签约地之外；
    所述第二会话管理网元向所述第一会话管理网元发送所述会话标识对应的目标DNAI集合，所述目标DNAI集合包括所述会话标识对应的DNAI与所述第一会话管理网元支持的DNAI的交集；
    所述第一会话管理网元根据所述目标DNAI集合和所述终端设备的接入位置信息向第一用户面网元发送请求消息，所述请求消息用于请求为所述终端设备分配互联网协议IP地址，所述第一用户面网元支持所述目标DNAI集合中的至少一个目标DNAI，且所述第一用户面网元的服务区域包括所述接入位置，所述接入位置信息用于指示所述终端设备的接入位置，所述接入位置位于所述签约地之外；
    所述第一用户面网元向所述第一会话管理网元发送所述终端设备的IP地址；
    所述第一会话管理网元向所述第二会话管理网元发送所述终端设备的IP地址。
  34. 一种分配互联网协议地址的方法，其特征在于，包括：
    第一会话管理网元向第二会话管理网元发送会话标识，所述会话标识用于标识终端设备请求激活的会话，所述第二会话管理网元部署在所述终端设备签约的专用数据网络名称DNN的签约地，所述第一会话管理网元部署在所述签约地之外；
    所述第二会话管理网元向所述第一会话管理网元发送所述会话标识对应的数据网络接入标识DNAI；
    所述第一会话管理网元确定所述目标DNAI集合包括所述会话标识对应的DNAI与所述第一会话管理网元支持的DNAI的交集；
    所述第一会话管理网元根据所述目标DNAI集合和所述终端设备的接入位置信息向 第一用户面网元发送请求消息，所述请求消息用于请求为所述终端设备分配互联网协议IP地址，所述第一用户面网元支持所述目标DNAI集合中的至少一个目标DNAI，且所述第一用户面网元的服务区域包括所述接入位置，所述接入位置信息用于指示所述终端设备的接入位置，所述接入位置位于所述签约地之外；
    所述第一用户面网元向所述第一会话管理网元发送所述终端设备的IP地址；
    所述第一会话管理网元向所述第二会话管理网元发送所述终端设备的IP地址。
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