WO2018233615A1 - 一种pdu会话处理方法及装置 - Google Patents

一种pdu会话处理方法及装置 Download PDF

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Publication number
WO2018233615A1
WO2018233615A1 PCT/CN2018/091906 CN2018091906W WO2018233615A1 WO 2018233615 A1 WO2018233615 A1 WO 2018233615A1 CN 2018091906 W CN2018091906 W CN 2018091906W WO 2018233615 A1 WO2018233615 A1 WO 2018233615A1
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WIPO (PCT)
Prior art keywords
network element
pdu session
session
core network
management network
Prior art date
Application number
PCT/CN2018/091906
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English (en)
French (fr)
Inventor
李欢
陆伟
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Priority claimed from CN201711159218.1A external-priority patent/CN109104773B/zh
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CA3063251A priority Critical patent/CA3063251A1/en
Priority to BR112019024636-3A priority patent/BR112019024636A2/pt
Priority to KR1020197036099A priority patent/KR20200003906A/ko
Priority to EP18820506.6A priority patent/EP3621352B1/en
Priority to JP2019570063A priority patent/JP2020524459A/ja
Publication of WO2018233615A1 publication Critical patent/WO2018233615A1/zh
Priority to US16/720,291 priority patent/US20200128461A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup

Definitions

  • the present application relates to the field of mobile communications technologies, and in particular, to a PDU session processing method and apparatus.
  • the fifth-generation (5rd generation, 5G) core network allows terminals to access the network from the 3GPP (3rd generation partnership project (3GPP) access network, and also allows the terminal to pass through an access gateway (for example, non-3GPP interworking function (non-3GPP interworking function) , N3IWF)) Access from non-3GPP (non-3GPP) access networks.
  • an access gateway for example, non-3GPP interworking function (non-3GPP interworking function) , N3IWF)
  • PLMN public land mobile network
  • AMF access and mobility management function
  • the terminal may select a different PLMN from the 3GPP access network (such as another visited public land mobile network (visited public). Land mobile network (vPLMN) or the N3IWF of the home public land mobile network (hPLMN).
  • vPLMN visited public land mobile network
  • hPLMN home public land mobile network
  • the 5G core network needs two AMF network elements to perform access control management on the terminal. There is no related solution between the roaming scene and the non-roaming scene, and between the roaming scene and the roaming scene, whether the terminal can switch the PDU session and how to switch.
  • the embodiment of the present invention provides a PDU session processing method and device, which are used to provide a solution for PDU session switching.
  • the embodiment of the present application provides the following technical solutions:
  • the first aspect provides a PDU session processing method, including: a first core network element receives a first message from a terminal by using a first network, where the first message includes handover indication information, and is used to indicate that the first core network element
  • the PDU session is handed over from the second network to the first network, and then the first core network element handles the handover of the PDU session according to the roaming status information of the PDU session.
  • the first core network element can process the handover of the PDU session according to the roaming state information of the PDU session, thereby providing a solution for PDU session handover, and, due to the roaming state according to the PDU session
  • the information processing PDU session is switched to avoid the failure to accept the handover request first. Further, compared with the method that cannot initiate the handover request, the method of the present application can ensure service continuity in some allowed scenarios.
  • the first core network element establishes a PDU session in the first network.
  • the first core network element rejects establishing a PDU session in the first network.
  • the first The core network element rejects establishing the PDU session at the first network.
  • the first core network element handles the handover of the PDU session according to the roaming state information of the PDU session and the IP continuity requirement information of the terminal corresponding to the PDU session before and after the handover.
  • the first core network element rejects establishing a PDU session in the first network.
  • the first core network element establishes a PDU session in the first network.
  • the first core network element determines the roaming status information of the PDU session according to the session management NE identity information corresponding to the PDU session.
  • the first core network element obtains the roaming status information of the PDU session from the data management network element.
  • the first message further includes roaming status information
  • the first core network element obtains roaming status information of the PDU session from the first message.
  • the first core network element obtains the IP continuity requirement information of the terminal corresponding to the PDU session from the data management network element.
  • the first message further includes the IP continuity requirement information of the terminal corresponding to the PDU session, and the first core network element obtains the IP continuity requirement information of the terminal corresponding to the PDU session from the first message.
  • the foregoing provides several ways to obtain the IP continuity requirement information of the terminal corresponding to the PDU session.
  • one or several processing modes may be selected according to actual conditions.
  • an embodiment of the present application provides a PDU session processing apparatus, where the apparatus has a function of implementing a first core network element in the foregoing method embodiment.
  • This function can be implemented in hardware or in hardware by executing the corresponding software.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the apparatus includes: a processor, a transceiver, a memory; the memory is configured to store computer execution instructions, the transceiver is configured to enable the apparatus to communicate with other communication entities, and the processor and the memory pass
  • the bus is coupled, and when the device is in operation, the processor executes the computer stored instructions stored by the memory to cause the PDU session processing device to perform the method of the first aspect above.
  • the embodiment of the present application provides a PDU session processing method, including: receiving, by a first core network element, a first message from a terminal by using a first network, where the first message includes handover indication information, and the handover indication The information is used to indicate that the first core network element switches the packet data unit PDU session from the second network to the first network; if the PDU session before the handover is disconnected after the handover PDU session is established, and the The IP continuity of the terminal is guaranteed, and the first core network element rejects the handover of the PDU session.
  • an embodiment of the present application provides a PDU session processing apparatus, where the apparatus has a function of implementing a first core network element in the foregoing method embodiment.
  • This function can be implemented in hardware or in hardware by executing the corresponding software.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the apparatus includes: a processor, a transceiver, a memory; the memory is configured to store computer execution instructions, the transceiver is configured to enable the apparatus to communicate with other communication entities, and the processor and the memory pass
  • the bus is coupled, and when the device is in operation, the processor executes the computer stored instructions stored by the memory to cause the PDU session processing device to perform the method of the third aspect above.
  • the embodiment of the present application provides a PDU session processing method, which may be performed by a session management network element, where the session management network element may be, for example, an SMF network element, where the method includes: the session management network element performs a PDU session.
  • the at least one of the roaming status information, the IP continuity requirement information of the terminal corresponding to the PDU session, and the session management network element identification information is sent to the data management network element.
  • the data management network element may be a UDM network element.
  • an embodiment of the present application provides a PDU session processing apparatus, where the apparatus has a function of implementing a session management network element in the foregoing method embodiment.
  • This function can be implemented in hardware or in hardware by executing the corresponding software.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the apparatus includes: a processor, a transceiver, a memory; the memory is configured to store computer execution instructions, the transceiver is configured to enable the apparatus to communicate with other communication entities, and the processor and the memory pass
  • the bus is coupled, and when the device is in operation, the processor executes the computer stored instructions stored by the memory to cause the PDU session processing device to perform the method of the fifth aspect above.
  • the embodiment of the present application provides a PDU session processing method, where the method may be performed by a terminal, where the method includes: the terminal sending a first message to the first core network element, where the first message includes handover indication information, and the handover The indication information is used to indicate that the first core network element switches the PDU session from the second network to the first network; then, the terminal receives the second message from the first core network element, where the second message is used to indicate the PDU session. process result.
  • the second message is used to indicate establishment of a PDU session.
  • the second message is used to indicate a rejection of a PDU session switch.
  • the first message includes roaming status information.
  • the first message includes IP continuity requirement information of the terminal corresponding to the PDU session.
  • the first message includes a PDU session identifier.
  • the terminal determines that a handover request needs to be initiated according to the IP continuity requirement information.
  • the terminal determines that the SSC mode of the PDU session is SSC mode 1 or SSC mode 3.
  • an embodiment of the present application provides a PDU session processing apparatus, where the apparatus has a function of implementing a terminal in the foregoing method embodiment.
  • This function can be implemented in hardware or in hardware by executing the corresponding software.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the apparatus includes: a processor, a transceiver, a memory; the memory is configured to store computer execution instructions, the transceiver is configured to enable the apparatus to communicate with other communication entities, and the processor and the memory pass
  • the bus is coupled, and when the device is in operation, the processor executes the computer-executable instructions stored by the memory to cause the PDU session processing device to perform the method of the seventh aspect above.
  • a ninth aspect the embodiment of the present application provides a PDU session processing method, including: receiving, by a first core network element, a first message from a terminal by using a first network, where the first message includes handover indication information, and the switching The indication information is used to indicate that the first core network element switches the PDU session from the second network to the first network; the first core network element is configured according to the identifier information of the session management network element corresponding to the PDU session. Handling the handover of the PDU session.
  • the first core network element processing the switching of the PDU session according to the identifier information of the session management network element corresponding to the PDU session, including: the first core network element according to The identifier information of the session management network element identifier determines that the first core network element can be connected to the session management network element; and the first core network element establishes the PDU session in the first network.
  • the first core network element determines, according to the identifier information of the session management network element, that the first core network element and the session management network element do not belong to the same PLMN, and the The PLMN where the session management network element is located is the visited PLMN, and the first core network element rejects establishing a PDU session in the first network.
  • the first core network element processing the switching of the PDU session according to the identifier information of the session management network element corresponding to the PDU session, including: the first core network element according to The identifier information of the session management network element identifier determines that the first core network element cannot be connected to the session management network element; and the first core network element refuses to establish the PDU session in the first network.
  • the first core network element processing the switching of the PDU session according to the identifier information of the session management network element corresponding to the PDU session, including: the first core network element according to The identification information of the session management network element determines that the first core network element and the session management network element belong to the same public land mobile network PLMN; the first core network element establishes the PDU session.
  • the first core network element processing the switching of the PDU session according to the identifier information of the session management network element corresponding to the PDU session, including: the first core network element according to The identification information of the session management network element determines that the first core network element and the session management network element do not belong to the same PLMN; the first core network element rejects establishing the PDU session in the first network. .
  • the identifier information of the session management network element includes the identifier information of the PLMN where the session management network element is located.
  • the first core network element obtains the identifier information of the session management network element from the data management network element.
  • the first core network element processing the switching of the PDU session according to the identifier information of the session management network element corresponding to the PDU session including: the first core network element according to The identifier information of the session management network element and the Internet Protocol IP continuity requirement information of the terminal corresponding to the PDU session before and after the handover, and the handover of the PDU session is processed.
  • the embodiment of the present application provides a PDU session processing apparatus, including: a transceiver unit and a processing unit, where the transceiver unit is configured to receive a first message from a terminal by using a first network, where the first message includes a handover. Instructing information, the switching indication information is used to instruct the processing unit to switch a PDU session from the second network to the first network, and the processing unit is configured to: according to the identifier information of the session management network element corresponding to the PDU session Handling the handover of the PDU session.
  • a PDU session processing apparatus includes a memory, a processor, and a communication interface, the memory is configured to store computer instructions, and the processor is configured to perform the following operations according to computer instructions stored in the memory:
  • the communication interface receives the first message from the terminal by using the first network, where the first message includes handover indication information, where the handover indication information is used to instruct the processor to switch the PDU session from the second network to the first
  • the network processes the switching of the PDU session according to the identifier information of the session management network element corresponding to the PDU session.
  • the embodiment of the present application provides a computer storage medium, configured to store computer software instructions used by a first core network element, and configured to perform the foregoing aspects for a first core network element. program.
  • the embodiment of the present application provides a computer storage medium for storing computer software instructions for use in a session management network element, including a program designed to perform the foregoing aspects for a session management network element.
  • the embodiment of the present application provides a computer storage medium for storing computer software instructions for a terminal, which includes a program designed to execute the foregoing aspects for a terminal.
  • the embodiment of the present application provides a computer program product.
  • the computer program product includes computer software instructions that are loadable by a processor to implement the processes of the first aspect method described above.
  • the embodiment of the present application provides a computer program product.
  • the computer program product includes computer software instructions that are loadable by a processor to implement the processes of the third aspect method described above.
  • the embodiment of the present application provides a computer program product.
  • the computer program product includes computer software instructions that are loadable by a processor to implement the processes of the fifth aspect method described above.
  • the embodiment of the present application provides a computer program product.
  • the computer program product includes computer software instructions that are loadable by a processor to implement the processes of the seventh aspect method described above.
  • the embodiment of the present application provides a chip, including a processor, a transceiver component, and optionally a memory, for performing the PDU session processing method of the foregoing aspect.
  • FIG. 1 is a schematic diagram of a network architecture applied to an embodiment of the present application
  • FIG. 2 is a schematic diagram of another network architecture applied in the embodiment of the present application.
  • FIG. 3 is a schematic diagram of still another network architecture applied in the embodiment of the present application.
  • FIG. 4 is a schematic diagram of a PDU session processing method according to an embodiment of the present disclosure.
  • FIG. 5 is a schematic diagram of another PDU session processing method according to an embodiment of the present disclosure.
  • FIG. 6 is a schematic diagram of another PDU session processing method according to an embodiment of the present disclosure.
  • FIG. 7 is a PDU session processing apparatus according to an embodiment of the present application.
  • FIG. 8 is another PDU session processing apparatus according to an embodiment of the present application.
  • FIG. 9 is still another PDU session processing apparatus according to an embodiment of the present application.
  • a terminal is a wireless transceiver that can be deployed on land, indoors or outdoors, handheld or on-board; it can also be deployed on the water (such as ships); it can also be deployed in the air (such as airplanes, balloons, and satellites). Superior).
  • the terminal may be a mobile phone, a tablet, a computer with wireless transceiver function, a virtual reality (VR) terminal, an augmented reality (AR) terminal, industrial control (industrial control) Wireless terminal, wireless terminal in self driving, wireless terminal in remote medical, wireless terminal in smart grid, wireless terminal in transport safety, A wireless terminal in a smart city, a wireless terminal in a smart home, and the like.
  • the terminal is used as an example for the UE.
  • FIG. 1 is a schematic diagram of a network architecture applied to an embodiment of the present application. 1 is a non-roaming scenario, FIG. 2 is a local breakout (LBO) scenario, and FIG. 3 is a home routed (HR) scenario.
  • LBO local breakout
  • HR home routed
  • the network framework includes user equipment (UE), 3GPP access network element, non-3GPP access network (Non-3GPP), N3IWF, AMF network element, and session management function (session).
  • UE user equipment
  • 3GPP access network element non-3GPP access network
  • N3IWF non-3GPP access network
  • AMF application management function
  • session management function session management function
  • SMF management function
  • UPF user plane function
  • DN data network
  • a UE is also generally referred to as a terminal, and a 3GPP access network element is also referred to as a Radio Access Network (R-AN), such as a base station in 5G.
  • the Non-3GPP access network refers to an access network other than 3GPP, such as a wireless local area networks (WLAN) access network.
  • the N3IWF is similar to the evolved packet data gateway (ePDG) in LTE.
  • ePDG evolved packet data gateway
  • IPsec Internet protocol security
  • the name of the N3IWF may change.
  • the AMF network element is responsible for terminal access management and mobility management. In practical applications, it includes the mobile management entity mobility management entity (MME) in the network framework of long term evolution (LTE). Mobility management capabilities and added access management capabilities.
  • MME mobile management entity mobility management entity
  • LTE long term evolution
  • the session management function SMF network element is responsible for session management, such as session establishment of a user, that is, a session management function in the MME network element.
  • the UPF network element is a functional network element of the end user plane, and is mainly responsible for connecting to an external network, which includes a correlation between a serving gateway (SGW) of LTE and a public data network (PDN) gateway (PDN-GW).
  • SGW serving gateway
  • PDN-GW public data network gateway
  • the data network element DN is responsible for providing services for the UE. For example, some DNs provide Internet access for terminals, and other DNs provide SMS functions for terminals.
  • the UE accesses the same core network through the 3GPP access technology and the non-3GPP access technology.
  • the core network includes: AMF network element, SMF network element, UPF network element, DN network element and other network elements and a connection interface between network elements.
  • the architecture shown in Figure 1 is primarily applicable to non-roaming scenarios.
  • the architecture shown in FIG. 2 and FIG. 3 is a roaming scenario.
  • the terminal accesses different core networks through the 3GPP access technology and the non-3GPP access technology, and the difference from the non-roaming scenario shown in FIG. 1 is mainly
  • the access to the core network through the 3GPP access technology is different from the PLMN used by the non-3GPP access technology to access the core network, and in the roaming scenario, the terminal is managed and controlled by using different AMF network elements.
  • the IP address of the terminal may need to be changed before and after the handover.
  • the IP address does not need to be changed before and after the switchover. It can also be understood that the IP continuity of the terminal needs to be ensured. The IP address needs to be changed before and after the switchover. Continuity.
  • the IP continuity requirement information of the terminal corresponding to the PDU session before and after the handover may be determined according to whether the UPF connected to the PDU session of the terminal changes before and after the handover, for example, if the PDU of the terminal The session does not change the UPF before and after the switchover. That is, the PDU session has the UPF anchor. The IP address does not need to change before and after the switchover. If the UPF of the PDU session changes before and after the switchover, the PDU session does not have the UPF anchor. Point, the IP address needs to change before and after the switch.
  • the IP continuity requirement information of the terminal corresponding to the PDU session before and after the handover may be a Session and Service Continuity mode (SSC) according to the prior art.
  • SSC Session and Service Continuity mode
  • the IP address is considered to be unchanged before and after the handover.
  • SSC mode 2 or SSC mode 3 the IP address is considered to need to occur before and after the handover. Variety.
  • SSC mode is as follows:
  • SSC mode 1 The UPF anchor point of the PDU session does not change before and after the handover, and the IP address of the UE does not change.
  • SSC mode 2 The UPF of the PDU session changes before and after the handover.
  • the original PDU session ie, the PDU session before handover
  • the new PDU session ie, the switched PDU session
  • SSC mode 3 The UPF of the PDU session changes before and after the handover, and the original PDU session (ie, the PDU session before handover) is disconnected after the establishment of the new PDU session (ie, the switched PDU session) is completed.
  • the first network refers to one of a 3GPP access network and a non-3GPP access network
  • the second network refers to another one of a 3GPP access network and a non-3GPP access network.
  • the first network is a 3GPP access network
  • the second network is a non-3GPP access network
  • the first network is a non-3GPP access network
  • the second network is a 3GPP access network.
  • the first network is an access network after the terminal PDU session is switched
  • the second network is an access network before the terminal PDU session is switched.
  • the terminal in the architecture shown in FIG. 1 when the PDU session of the terminal is switched from the second network shown in FIG. 1 to the first network shown in FIG. 1 , it may be according to the current related prior art method.
  • the PDU session is switched.
  • the terminal when the terminal is in the second network shown in FIG. 1, it needs to switch to the first network shown in FIG. 2 or FIG. 3, or when the terminal is in the second network shown in FIG. 2 or FIG. There is no related solution to switch to the first network shown in Figure 1 or Figure 2 or Figure 3.
  • FIG. 4 is a schematic flowchart, including the following steps:
  • Step 401 The terminal sends a first message to the first core network element by using the first network, where the first core network element receives the first message from the terminal.
  • the first message includes handover indication information, and is used to instruct the first core network element to switch the PDU session from the second network to the first network.
  • the PDU session is established by the terminal through the second network prior to step 401.
  • the first core network element may be a network element with access and mobility management functions, for example, may be an AMF network element, and the first core network element is a network in the first network. yuan.
  • the first core network element may be the AMF network element in FIG. 1;
  • the first core network element is the network element in FIG. 2 or FIG. 3, since both FIG. 2 and FIG. 3 have two AMF network elements, if the current terminal PDU session is in the 3GPP access network, the first core The network element may be an AMF network element in the core network corresponding to the non-3GPP access network. If the PDU session of the current terminal is in a non-3GPP access network, the first core network element may be in the core network corresponding to the 3GPP access network. AMF network element.
  • the first message may be a PDU session establishment request message.
  • the terminal determines, according to the IP continuity requirement information, that the first message needs to be initiated.
  • the terminal determines that the SSC mode of the PDU session is SSC mode1 or SSC mode3.
  • Step 402 The first core network element acquires the roaming status information of the PDU session, and processes the handover of the PDU session according to the roaming status information.
  • the roaming status information of the PDU session is used to indicate the roaming status of the PDU session, for example, including local offloading, home routing, non-roaming, etc., it should be noted that as the communication technology develops, subsequent roaming states may be added. It still falls within the scope of protection of this application.
  • the first core network element establishes a PDU session in the first network, that is, the PDU session is switched from the second network to the first network. Network and create a new PDU session on the first network.
  • the first A core network element rejects establishing the PDU session at the first network.
  • the first core network element rejects establishing a PDU session in the first network, that is, does not agree that the PDU session is switched from the second network to the first. Network and refuse to create a new PDU session.
  • the first core network element may further process the switching of the PDU session according to the roaming state information of the PDU session and the IP continuity requirement information of the terminal corresponding to the PDU session before and after the handover.
  • the IP continuity requirement information of the terminal corresponding to the PDU session before and after the handover may be used to indicate whether the IP continuity of the terminal needs to be guaranteed.
  • the first core network element rejects establishing a PDU session in the first network. For example, in one implementation, when the SSC mode of the PDU session is SSC mode 1, the first core network element rejects establishing a PDU session on the first network.
  • the first core network element establishes a PDU session in the first network.
  • the SSC mode of the PDU session is SSC mode 2 or SSC mode 3
  • the first core network element establishes a PDU session on the first network.
  • the first core network element rejects whether the roaming status information of the PDU session is local offload, home route, or non-roaming.
  • the first network establishes a PDU session.
  • the first core network element is established in the first network. PDU session.
  • the first core network element rejects establishing a PDU session in the first network. .
  • the first core network element determines whether to perform PDU session switching according to the roaming state information of the PDU session, for example, Determining a PDU session handover and creating a new PDU session, or rejecting the PDU session handover, thereby providing a PDU session processing method when the terminal is in a roaming or non-roaming scenario.
  • the roaming status information of the PDU session may be determined by the first core network element according to the session management NE identity information corresponding to the PDU session, optionally, the session management network element.
  • the SMF network element may be obtained.
  • the first core network element may obtain the session management NE identity information corresponding to the PDU session from the data management network element (for example, the data management network element may be a UDM network element).
  • the session management network element identifier information includes a PLMN identifier, and the roaming state information of the PDU session may be determined according to the PLMN identifier.
  • the session management network element identifier information corresponding to the PDU session may be the identifier information of the session management network element corresponding to the PDU session before the handover.
  • the roaming status information of the PDU session Routing for hometown If the first core network element and the session management network element corresponding to the PDU session are both in the HPLMN, the roaming status information of the PDU session is non-roaming. If the first core network element and the session management network element corresponding to the PDU session are both in the VPLMN, the roaming status information of the PDU session is a local offload.
  • the session management network element when the PDU session is in the home routing state, is a home domain session management network element.
  • the PLMN that establishes the PDU session for the terminal is the same as the PLMN where the first core network element is located.
  • the first core network element may obtain the session management network element identifier information corresponding to the PDU session from the data management network element in the registration process.
  • the specific method refer to the prior art.
  • the roaming status information of the PDU session may be sent by the AMF network element in the second network to the terminal during the establishment of the PDU session in the second network, so that the terminal passes the foregoing step 401.
  • the first message may carry the roaming status information of the PDU session, so that the first core network element can obtain the roaming status of the PDU session from the first message. information.
  • the roaming status information of the PDU session may also be that the terminal stores the data to the data management network element (for example, may be an SMF network element) during the establishment of the PDU session in the second network, so that the first The core network element can obtain the roaming status information of the PDU session from the data management network element.
  • the data management network element for example, may be an SMF network element
  • the IP continuity requirement information of the terminal corresponding to the PDU session may be that the terminal stores the data to the data management network element by the session management network element during the establishment of the PDU session in the second network, so that the first The core network element can obtain the IP continuity requirement information of the terminal corresponding to the PDU session from the data management network element.
  • the IP continuity requirement information of the terminal corresponding to the PDU session may be that, when the terminal sends the first message to the first core network element through the first network, in the foregoing step 401, the terminal may be in the first message. And carrying the IP continuity requirement information of the terminal corresponding to the PDU session, so that the first core network element can obtain the IP continuity requirement information of the terminal corresponding to the PDU session from the first message.
  • the terminal does not go to the first core network regardless of whether the roaming status information of the PDU session is local offload, home route, or non-roaming.
  • the network element sends the first message, that is, in the implementation manner, when the SSC mode of the PDU session is SSC mode 2, the PDU session processing method provided by the embodiment of the present application is not performed.
  • This embodiment of the present application provides another PDU session processing method.
  • the same parts in this embodiment as those in the embodiment shown in Fig. 4 are described in the description of the embodiment of Fig. 4. Specifically, the method includes:
  • the first core network element receives the first message from the terminal by using the first network, where the first message includes handover indication information, where the handover indication information is used to indicate that the first core network element sends the PDU session from the second
  • the network switches to the first network, as described in detail in step 401.
  • the first core network element processes the switching of the PDU session according to the identifier information of the session management network element corresponding to the PDU session.
  • the first core network element performs the switching of the PDU session according to the identifier information of the session management network element corresponding to the PDU session, and includes the following manners:
  • the first core network element determines that the first core network element can be connected to the session management network element according to the identifier information of the session management network element identifier, the first core network element is in the The first network establishes the PDU session.
  • the first core network element determines that the first core network element and the session management network element belong to the same PLMN according to the identifier information of the session management network element, The first core network element can be connected to the session management network element; or if the first core network element determines, according to the identification information of the session management network element, a PLMN that establishes a PDU session for the terminal and the session
  • the management network element belongs to the same PLMN, and the first core network element can be connected to the session management network element.
  • the first core network element determines that the first core network element cannot be connected to the session management network element according to the identifier information of the session management network element identifier, the first core network element rejects The first network establishes the PDU session.
  • the first core network element determines that the first core network element and the session management network element do not belong to the same PLMN according to the identifier information of the session management network element, The first core network element cannot be connected to the session management network element; or, if the first core network element determines, according to the identification information of the session management network element, a PLMN that establishes a PDU session for the terminal and the If the session management network element does not belong to the same PLMN, the first core network element cannot be connected to the session management network element.
  • the first core network element determines, according to the identifier information of the session management network element, that the first core network element and the session management network element do not belong to the same PLMN, and The PLMN where the session management network element is located is a visited PLMN, and the first core network element rejects establishing a PDU session in the first network.
  • the PLMN where the session management network element is located is a VPLMN, that is, the roaming state information of the PDU session is a local offload.
  • the first core network element performs the processing according to the identifier information of the session management network element and the Internet Protocol IP continuity requirement information of the terminal corresponding to the PDU session before and after the handover. Switching of PDU sessions. See the description of step 402 for details.
  • the solution provided by the embodiment of the present application is mainly introduced from the perspective of interaction between the network elements. It can be understood that the foregoing implementation of the first core network element includes hardware structures and/or software modules corresponding to the execution of the respective functions. Those skilled in the art will readily appreciate that the present application can be implemented in a combination of hardware or hardware and computer software in combination with the elements and algorithm steps of the various examples described in the embodiments disclosed herein.
  • FIG. 5 is a flowchart of a PDU session processing method according to an embodiment of the present disclosure.
  • the UE in FIG. 5 is a terminal in the embodiment of the present application, and the AMF1 network element is an AMF network element in the first network, where An implementation manner of the first core network element in the embodiment of the present application, where RAN1 is an access network element in the first network, AMF2 is an AMF network element in the second network, and RAN2 is an access in the second network.
  • the network element, the SMF network element is a specific implementation of the session management network element, and the policy control function (PCF) network element can be used to complete the wireless channel control function related to the packet data, and the packet data performed by the terminal.
  • the service is converted, managed, and controlled.
  • the UDM network element is a specific implementation of the data management network element and can be used to store related information. It should be noted that the SMF network element, the PCF network element, the UDM network element, and the DN network element in FIG. 5 may also have two or more respectively, and those skilled in the art may use the core network according to the specific application scenario. The specific settings of the meta are inferred.
  • the method shown in Figure 5 includes the following steps:
  • Step 1 The UE establishes a PDU session through the second network.
  • the second network is the access network where the PDU session of the UE (ie, the terminal) is currently located.
  • Step 2 The SMF network element stores related information.
  • the SMF network element may store the SMF identification information and the PDU session identifier to the UDM network element.
  • the SMF network element refers to the SMF network element in the second network.
  • the SMF network element also stores the roaming status information to the UDM network element.
  • the SMF network element further stores the IP continuity requirement information of the terminal corresponding to the PDU session to the UDM network element.
  • the SMF network element stores the SSC mode of the PDU session to the UDM.
  • the SMF network element may further determine whether the UDM stores the roaming status information corresponding to the PDU session. If the UDM does not store the roaming status information corresponding to the PDU session, the SMF network element sends the roaming status information to the UDM.
  • Step 3 The UE sends a PDU session establishment request message to the AMF1 network element through the first network.
  • the AMF1 is the first core network element in the first network.
  • the PDU session establishment request message includes handover indication information, and optionally, a PDU session identifier.
  • Step 4 The AMF1 network element determines the SMF network element.
  • the AMF1 network element determines whether the SMF network element corresponding to the PDU session can be found locally. If the SMF network element corresponding to the PDU session is found locally, it indicates that there is only one core network in the 5G architecture, that is, only one SMF network element. For example, the architecture shown in FIG. 1 , in this case, the PDU session switching can be performed according to the related art related method, which is not within the scope of the present application; if the SMF network element corresponding to the PDU session is not found locally, the UDM is obtained from the UDM. Find the SMF network element in the NE.
  • the session roaming information corresponding to the PDU session is also obtained from the UDM network element.
  • the IP continuity requirement information of the terminal corresponding to the PDU session is stored in the SMF network element, the IP continuity requirement information of the terminal corresponding to the PDU session is also obtained from the UDM network element.
  • the PDU session establishment request message carries the session roaming information corresponding to the PDU session, the session roaming information corresponding to the PDU session is obtained from the PDU session establishment request message.
  • the PDU session establishment request message carries the IP continuity requirement information of the terminal corresponding to the PDU session
  • the IP continuity requirement information of the terminal corresponding to the PDU session is obtained from the PDU session establishment request message.
  • Step 5 When AMF1 determines that the PDU session is switchable, AMF1 establishes a PDU session through the first network.
  • Step 6 Release the PDU session through the first network, and the process ends.
  • the AMF1 network element initiates a PDU session release procedure to the UE; if the PDU session corresponds to the SSC mode 2 or the SSC mode 3, the UE sends a PDU session release procedure to the AMF1 network element. .
  • Step 7 When the AMF1 network element determines that the PDU session cannot be switched, the AMF1 network element refuses to establish a PDU session, and the process ends.
  • the AMF1 network element sends a message rejecting the handover to the UE.
  • FIG. 6 is a flowchart of another PDU session processing method provided by an embodiment of the present application, which is generally the same as the flowchart shown in FIG. 5, and the main difference between the two is: the process shown in FIG.
  • the AMF2 network element sends a PDU session establishment accept message to the UE, where the message includes roaming status information
  • the PDU session establishment request message sent by the UE to the AMF1 network element in the step 3 includes the The roaming status information, that is, the roaming status information of the PDU session is sent by the UE to the AMF1 network element through the PDU session establishment request message.
  • the AMF2 network element sends a PDU session establishment accept message to the UE, where the message includes roaming status information
  • the PDU session establishment request message sent by the UE to the AMF1 network element in the step 3 includes the The roaming status information, that is, the roaming status information of the PDU session is sent by the UE to the AMF1 network element through the PDU session establishment request message.
  • FIG. 5 and FIG. 6 are only examples of specific implementation manners. In actual applications, other implementation manners may also be provided, as long as the implementation technical means conforms to the flow shown in FIG. All should fall within the scope of protection of this application.
  • the embodiment of the present application further provides a PDU session processing apparatus 700, including at least one processor 71, a communication bus 72, a memory 73, and at least one communication interface 74.
  • the apparatus 700 may be the first core network element in the embodiment of the present application, for example, may be the AMF network element in FIG. 1 to FIG. 3, and may also be the AMF1 network element in FIG. 5 and FIG. 700 can be used to perform the above method of the embodiments of the present application.
  • the processor 71 can be a general purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the program of the present application.
  • CPU central processing unit
  • ASIC application-specific integrated circuit
  • Communication bus 72 can include a path for communicating information between the components described above.
  • the communication interface 74 uses devices such as any transceiver for communicating with other devices or communication networks, such as Ethernet, Radio Access Network (RAN), WALN, and the like.
  • RAN Radio Access Network
  • WALN Wireless Local Area Network
  • the memory 73 can be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (RAM) or other type that can store information and instructions.
  • the dynamic storage device can also be an Electrically Erasable Programmable Read-Only Memory (EEPROM), a Compact Disc Read-Only Memory (CD-ROM) or other optical disc storage, and a disc storage device. (including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or can be used to carry or store desired program code in the form of instructions or data structures and can be Any other medium accessed by the device, but is not limited thereto.
  • the memory can exist independently and be connected to the processor via a bus. The memory can also be integrated with the processor.
  • the memory 73 is used to store application code for executing the solution of the present application, and is controlled by the processor 71 for execution.
  • the processor 71 is configured to execute application code stored in the memory 73.
  • processor 71 may include one or more CPUs, such as CPU0 and CPU1 in FIG.
  • the apparatus 700 can include a plurality of processors, such as the processor 71 and the processor 78 of FIG. Each of these processors can be a single-CPU processor or a multi-core processor.
  • a processor herein may refer to one or more devices, circuits, and/or processing cores for processing data, such as computer program instructions.
  • the AMF network element in FIG. 1 to FIG. 3 may be the device shown in FIG. 7, and one or more software modules are stored in the memory of the AMF network element.
  • the AMF network element can implement the software module through the processor and the program code in the memory to implement the processing of the PDU session.
  • the first core network element in FIG. 4 may be the apparatus shown in FIG. 7, and one or more software modules are stored in the memory of the first core network element.
  • the first core network element can implement the software module through the processor and the program code in the memory to implement the processing of the PDU session.
  • the AMF1 network element in FIGS. 5-6 may be the device shown in FIG. 7, and one or more software modules are stored in the memory of the AMF1 network element.
  • the AMF1 network element can implement the software module through the processor and the program code in the memory to implement the processing of the PDU session.
  • the embodiment of the present application may divide the function module of the first core network element according to the foregoing method example.
  • each function module may be divided according to each function, or two or more functions may be integrated into one processing module.
  • the above integrated modules can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of the module in the embodiment of the present application is schematic, and is only a logical function division, and the actual implementation may have another division manner.
  • FIG. 8 is a schematic structural diagram of a PDU session processing apparatus involved in the foregoing embodiment, and the apparatus 800 may be the first in the foregoing embodiment.
  • Core network element session management NE or terminal.
  • the device 800 includes a processing unit 801 and a transceiver unit 802.
  • the transceiver unit receives the first message from the terminal by using the first network, where the first message includes handover indication information, where the handover indication information is used to indicate that the first core network element is to be grouped.
  • the data unit PDU session is handed over from the second network to the first network;
  • a processing unit configured to process switching of the PDU session according to the roaming state information of the PDU session.
  • the processing unit is configured to: establish a PDU session in the first network if the roaming status information of the PDU session is home routing or non-roaming.
  • the processing unit is configured to: if the roaming state information of the PDU session is a local offload, refuse to establish a PDU session in the first network.
  • the processing unit is configured to: if the roaming state information of the PDU session is a local offload, and the first core network element and the PDU session are in a session management network corresponding to the first network The element does not belong to the same PLMN, and the first core network element rejects establishing the PDU session in the first network.
  • processing unit is specifically configured to:
  • the handover of the PDU session is handled according to the roaming state information of the PDU session and the Internet Protocol IP continuity requirement information of the terminal corresponding to the PDU session before and after the handover.
  • processing unit is specifically configured to:
  • the PDU session is refused to be established on the first network.
  • processing unit is specifically configured to:
  • a PDU session is established on the first network.
  • processing unit is further configured to:
  • the roaming state information of the PDU session is determined according to the session management NE identity information corresponding to the PDU session.
  • processing unit is further configured to:
  • the first message further includes roaming status information
  • the processing unit is further configured to: obtain roaming status information of the PDU session from the first message.
  • processing unit is further configured to:
  • the IP continuity requirement information of the terminal corresponding to the PDU session is obtained from the unified data management UDM network element.
  • the first message further includes the IP continuity requirement information of the terminal corresponding to the PDU session
  • the processing unit is further configured to: obtain the IP continuity requirement information of the terminal corresponding to the PDU session from the first message.
  • the transceiver unit is configured to receive, by using the first network, a first message from the terminal, where the first message includes handover indication information, where the handover indication information is used to indicate that the first core network element performs a packet data unit PDU.
  • the session is switched from the second network to the first network;
  • the processing unit is configured to reject the switching of the PDU session when the SSC mode of the PDU session is SSC mode 2.
  • the processing unit is configured to: one or more information of the roaming state information of the PDU session, the IP continuity requirement information of the terminal corresponding to the PDU session, and the session management network element identification information. , stored to the data management network element.
  • the data management network element may be a UDM network element.
  • the transceiver unit is configured to send a first message to the first core network element, where the first message includes handover indication information, where the handover indication information is used to indicate that the first core network element performs the PDU session from the first
  • the second network is switched to the first network
  • the transceiver unit is further configured to receive a second message from the first core network element, where the second message is used to indicate a PDU session processing result.
  • the second message is used to indicate that a PDU session is established.
  • the second message is used to indicate that the PDU session handover is rejected.
  • the first message includes roaming status information.
  • the first message includes IP continuity requirement information of the terminal corresponding to the PDU session.
  • the first message includes a PDU session identifier.
  • the device is presented in the form of dividing each functional module corresponding to each function, or the device is presented in a form that divides each functional module in an integrated manner.
  • a “module” herein may refer to an application-specific integrated circuit (ASIC), circuitry, a processor and memory that executes one or more software or firmware programs, integrated logic circuitry, and/or other functions that provide the functionality described above.
  • ASIC application-specific integrated circuit
  • Device implementing PDU session processing apparatus 800 may take the form shown in FIG.
  • the processing unit 801 and the transceiver unit 802 in FIG. 8 may be implemented by the processor 71 (and/or the processor 78) of FIG. 7 and the memory 73.
  • the processing unit 801 and the transceiver unit 802 may pass the processor.
  • 71 (and/or processor 78) is executed by calling the application code stored in the memory 73, which is not limited in this embodiment of the present application.
  • FIG. 9 is a schematic diagram of a PDU session processing apparatus according to an embodiment of the present application.
  • the PDU session processing apparatus includes a transceiver unit 901, a processing unit 902, and a storage unit 903.
  • the transceiver unit 901, the processing unit 902, and the storage unit 903 may be physically separate units, or may be integrated into one or more physical units, which is not limited herein.
  • the transceiver unit 901 is configured to implement the content interaction between the processing unit 902 and other units or network elements.
  • the transceiver unit 901 can be a communication interface of the PDU session processing device, a transceiver circuit or a transceiver, or a transceiver.
  • the transceiver unit 901 can also be a communication interface or a transceiver circuit of the processing unit 902.
  • the transceiver unit 901 can be a transceiver chip.
  • the PDU session processing apparatus may also include a plurality of transceiver units 901, or the transceiver unit 901 includes a plurality of sub-transceiver units.
  • the transceiver unit 901 may further include a transmitting unit and a receiving unit for performing corresponding transmitting and receiving operations.
  • the processing unit 902 is configured to implement processing of data by the PDU session processing apparatus.
  • Processing unit 902 can be a processing circuit or a processor.
  • the processor may be a central processing unit (CPU), a network processor (NP) or a combination of a CPU and an NP.
  • the processor may further include a hardware chip.
  • the hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof.
  • the PLD may be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a Generic Array Logic (GAL), or any combination thereof.
  • CPLD complex programmable logic device
  • FPGA field-programmable gate array
  • GAL Generic Array Logic
  • the PDU session processing apparatus may also include a plurality of processing units or the processing unit 902 includes a plurality of sub-data processing units.
  • the processor may be a single-CPU processor or a multi-core processor.
  • the storage unit 903 is used to store computer instructions executed by the processing unit 902.
  • the storage unit 903 may be a storage circuit or a memory.
  • the memory can be either volatile memory or non-volatile memory, or can include both volatile and nonvolatile memory.
  • the non-volatile memory may be a read-only memory (ROM), a programmable read only memory (ROMM), an erasable programmable read only memory (erasable PROM, EPROM), or an electrical Erase programmable EPROM (EEPROM) or flash memory.
  • the volatile memory can be a random access memory (RAM) that acts as an external cache.
  • the storage unit 903 may be a unit independent of the processing unit 902, or may be a storage unit in the processing unit 902, which is not limited herein. Although only one storage unit 903 is shown in FIG. 9, the PDU session processing apparatus may also include a plurality of storage units 903 or the storage unit 903 includes a plurality of sub storage units.
  • the processing unit 902 can perform content interaction with other network elements through the transceiver unit 901. For example, the processing unit 902 acquires or receives content from other network elements. If the processing unit 902 and the transceiver unit 901 are physically separate components, the processing unit 902 may perform content interaction with other units within the PDU session processing device without going through the transceiver unit 901.
  • the transceiver unit 901, the processing unit 902, and the storage unit 603 can be connected to each other through a bus.
  • the bus can be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus.
  • PCI peripheral component interconnect
  • EISA extended industry standard architecture
  • the bus can be divided into an address bus, a data bus, a control bus, and the like.
  • processing unit 902 causes PDU session processing means to implement the method of any of the embodiments of Figures 4-6 of the present application in accordance with computer instructions stored in storage unit 903.
  • the PDU session processing device may be a data processing chip or a data processing chip module, such as a System on Chip (SoC).
  • SoC System on Chip
  • the PDU session processing device may be an access and mobility management network element, a session management network element or a terminal device.
  • the transceiver unit 901 is configured to receive, by using the first network, a first message from the terminal, where the first message includes
  • the switching indication information is used to instruct the processing unit 902 to switch the PDU session from the second network to the first network; the processing unit is configured to manage the network element according to the session corresponding to the PDU session.
  • the identification information handles the switching of the PDU session.
  • the processing unit 902 is configured to determine, according to the identifier information of the session management network element identifier, that the PDU session processing apparatus is connectable to the session management network element; Establishing the PDU session in the first network.
  • the processing unit 902 is configured to determine, according to the identifier information of the session management network element identifier, that the PDU session processing apparatus cannot connect to the session management network element; Rejecting to establish the PDU session in the first network.
  • the processing unit 902 is configured to determine, according to the identifier information of the session management network element, that the first core network element and the session management network element do not belong to the same PLMN, and The PLMN where the session management network element is located is the visited PLMN; the processing unit 902 is configured to refuse to establish a PDU session in the first network.
  • the processing unit 902 is configured to determine, according to the identifier information of the session management network element, that the PDU session processing apparatus and the session management network element belong to the same public land mobile network PLMN; The processing unit 902 is configured to establish the PDU session in the first network.
  • the processing unit 902 is configured to determine, according to the identifier information of the session management network element, that the PDU session processing apparatus and the session management network element do not belong to the same PLMN; the processing unit 902 Used to refuse to establish the PDU session in the first network.
  • the identifier information of the session management network element includes the identifier information of the PLMN where the session management network element is located.
  • the transceiver unit 901 is further configured to acquire identifier information of the session management network element from a data management network element.
  • the processing unit 902 is configured to process, according to the identifier information of the session management network element and the Internet Protocol IP continuity requirement information of the terminal corresponding to the PDU session before and after the handover. Switching of PDU sessions.
  • the transceiver unit 901 is configured to implement the content transceiving operation of the AMF network element and the external network element in the embodiment corresponding to FIG. 5 or FIG. 6 of the present application.
  • the processing unit 902 is configured to implement the processing operation of the internal data or signaling of the AMF network element in the embodiment corresponding to FIG. 5 or FIG. 6 of the present application,
  • the processing unit 902 causes the PDU session processing apparatus to implement the operation of the AMF network element in the embodiment corresponding to FIG. 5 or FIG. 6 of the present application, for example:
  • the transceiver unit 901 Receiving, by the transceiver unit 901, the first message from the terminal by using the first network, where the first message includes handover indication information, where the handover indication information is used to instruct the processing unit 902 to switch the PDU session from the second network to
  • the first network processes the handover of the PDU session according to the identifier information of the session management network element corresponding to the PDU session.
  • the embodiment of the present application provides another PDU session processing apparatus, including a storage unit 903, a processing unit 902, and a transceiver unit 901.
  • the storage unit 903 is configured to store computer instructions.
  • the processing unit 902 is configured to use the storage unit 903.
  • the computer instructions stored therein perform the following operations: receiving, by the transceiver unit 901, a first message from a terminal, the first message including handover indication information, the handover indication information being used to instruct the processing unit 902 to The second network switches to the first network; and the handover of the PDU session is processed according to the roaming state information of the PDU session.
  • the transceiver unit 901 can be a communication interface of the PDU session processing device
  • the processing unit 902 can be a processor of the PDU session processing device
  • the storage unit 903 can be a memory of the PDU session processing device.
  • the embodiment of the present application further provides a computer storage medium for storing computer software instructions used by the PDU session processing apparatus shown in FIG. 7 and FIG. 8 above, which includes program code for executing the foregoing method embodiment. .
  • the processing of the PDU session can be implemented by executing the stored program code.
  • the embodiment of the present application also provides a computer program product.
  • the computer program product includes computer software instructions that are loadable by a processor to implement the methods of the above method embodiments.
  • the embodiment of the present application further provides a chip, which includes a processor and a transceiver component, and optionally, a storage unit, which can be used to perform the method of the foregoing embodiment of the present application.
  • embodiments of the present application can be provided as a method, apparatus (device), or computer program product.
  • the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware aspects, which are collectively referred to herein as "module” or “system.”
  • the application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.
  • the computer program is stored/distributed in a suitable medium, provided with other hardware or as part of the hardware, or in other distributed forms, such as over the Internet or other wired or wireless telecommunication systems.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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Abstract

本申请实施例提供一种分组数据单元PDU会话处理方法及装置。该方法包括：第一核心网网元通过第一网络接收来自终端的第一消息，第一消息包括切换指示信息，用于指示第一核心网网元将PDU会话从第二网络切换到第一网络，然后第一核心网网元根据PDU会话的漫游状态信息，处理PDU会话的切换。当终端处于不同的网络时，第一核心网网元可根据PDU会话的漫游状态信息处理PDU会话的切换，从而给出了一种PDU会话切换的解决方案。

Description

一种PDU会话处理方法及装置
本申请要求于2017年6月20日提交中国专利局、申请号为201710469763.4、申请名称为“一种PDU会话处理方法及装置”的中国专利申请、以及于2017年11月20日提交中国专利局、申请号为201711159218.1、申请名称为“一种PDU会话处理方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及移动通信技术领域，尤其涉及一种PDU会话处理方法及装置。
背景技术
第五代(5rd generation，5G)核心网络允许终端从3GPP(3rd generation partnership project，3GPP)接入网络接入，也允许终端经由一个接入网关(例如：非3GPP互通功能(non-3GPP interworking function，N3IWF))从非3GPP(non-3GPP)接入网络接入。当终端同时从3GPP和非3GPP接入网络接入的时候，一般会选择与3GPP接入网络同一个公共陆地移动网络(public land mobile network，PLMN)内的N3IWF。这样，5G核心网络中只需要一个接入和移动性管理功能(access and mobility management function，AMF)网元对该终端进行接入控制管理。
然而，在某些情况下，如漫游场景下，终端从3GPP接入网络接入到5G核心网时，终端可能选择与3GPP接入网络不同PLMN(如另一个拜访地公共陆地移动网络(visited public land mobile network，vPLMN)或者归属地公共陆地移动网络(home public land mobile network，hPLMN)的N3IWF，此时5G核心网就需要有两个AMF网元对该终端进行接入控制管理。对于终端在漫游场景与非漫游场景之间、以及在漫游场景与漫游场景之间，终端是否可以进行PDU会话的切换，以及如何进行切换，目前还没有相关方案。
发明内容
本申请实施例提供一种PDU会话处理方法及装置，用以提供一种PDU会话切换的解决方案。
为达到上述目的，本申请实施例提供如下技术方案：
第一方面，提供一种PDU会话处理方法，包括：第一核心网网元通过第一网络接收来自终端的第一消息，第一消息包括切换指示信息，用于指示第一核心网网元将PDU会话从第二网络切换到第一网络，然后第一核心网网元根据PDU会话的漫游状态信息，处理PDU会话的切换。当终端处于不同的网络时，第一核心网网元可根据PDU会话的漫游状态信息处理PDU会话的切换，从而给出了一种PDU会话切换的解决方案，以及，由于根据PDU会话的漫游状态信息处理PDU会话的切换，避免了先接受切换请求后又失败的情况发生，进 一步地，相较于不能发起切换请求的方法，本申请方法在一些允许的场景下可以保证业务连续性。
在一种可能的设计中，若PDU会话的漫游状态信息为家乡路由或非漫游，则第一核心网网元在所述第一网络建立PDU会话。
在一种可能的设计中，若PDU会话的漫游状态信息为本地分流，则第一核心网网元拒绝在第一网络建立PDU会话。
在一种可能的设计中，若所述PDU会话的漫游状态信息为本地分流，且所述第一核心网网元与所述PDU会话对应的会话管理网元不属于同一PLMN，所述第一核心网网元拒绝在所述第一网络建立所述PDU会话。
在一种可能的设计中，第一核心网网元根据PDU会话的漫游状态信息和切换前后PDU会话对应的终端的IP连续性需求信息，处理PDU会话的切换。
在一种可能的设计中，若PDU会话的漫游状态信息为本地分流，且需要保证终端的IP连续性，则第一核心网网元拒绝在所述第一网络建立PDU会话。
在一种可能的设计中，若PDU会话的漫游状态信息为本地分流，且不需要保证终端的IP连续性，则第一核心网网元在第一网络建立PDU会话。
上述给出了几种处理PDU会话的切换的方式，具体实现时，可根据实际情形，选择其中一种或几种方式来处理PDU会话的切换。
在一种可能的设计中，第一核心网网元根据PDU会话对应的会话管理网元标识信息，确定PDU会话的漫游状态信息。
在一种可能的设计中，第一核心网网元从数据管理网元获取PDU会话的漫游状态信息。
在一种可能的设计中，第一消息还包括漫游状态信息，第一核心网网元从第一消息中获取PDU会话的漫游状态信息。
上述给出了几种获取PDU会话的漫游状态信息的方式，具体实现时，可根据实际情形选择其中的一种或几种处理方式。
在一种可能的设计中，第一核心网网元从数据管理网元获取PDU会话对应的终端的IP连续性需求信息。
在一种可能的设计中，第一消息还包括PDU会话对应的终端的IP连续性需求信息，第一核心网网元从第一消息中获取PDU会话对应的终端的IP连续性需求信息。
上述给出了几种获取PDU会话对应的终端的IP连续性需求信息的方式，具体实现时，可根据实际情形选择其中的一种或几种处理方式。
第二方面，本申请的实施例提供一种PDU会话处理装置，该装置具有实现上述方法实施例中第一核心网网元的功能。该功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的模块。
在一种可能的设计中，该装置包括：处理器、收发器、存储器；该存储器用于存储计算机执行指令，该收发器用于实现该装置与其他通信实体进行通信，该处理器与该存储器通过该总线连接，当该装置运行时，该处理器执行该存储器存储的该计算机执行指令，以使该PDU会话处理装置执行上述第一方面的方法。
第三方面，本申请实施例提供一种PDU会话处理方法，包括：第一核心网网元通过第一网络接收来自终端的第一消息，所述第一消息包括切换指示信息，所述切换指示信息用 于指示所述第一核心网网元将分组数据单元PDU会话从第二网络切换到所述第一网络；若切换前的PDU会话在切换后的PDU会话建立完成之后断开，且需要保证所述终端的IP连续性，所述第一核心网网元拒绝PDU会话的切换。
第四方面，本申请的实施例提供一种PDU会话处理装置，该装置具有实现上述方法实施例中第一核心网网元的功能。该功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的模块。
在一种可能的设计中，该装置包括：处理器、收发器、存储器；该存储器用于存储计算机执行指令，该收发器用于实现该装置与其他通信实体进行通信，该处理器与该存储器通过该总线连接，当该装置运行时，该处理器执行该存储器存储的该计算机执行指令，以使该PDU会话处理装置执行上述第三方面的方法。
第五方面，本申请实施例提供一种PDU会话处理方法，该方法可由会话管理网元执行，该会话管理网元，例如可以是SMF网元，该方法包括：会话管理网元将PDU会话的漫游状态信息、PDU会话对应的终端的IP连续性需求信息、会话管理网元标识信息中的至少一发送给数据管理网元。
可选地，该数据管理网元可以是UDM网元。
第六方面，本申请的实施例提供一种PDU会话处理装置，该装置具有实现上述方法实施例中会话管理网元的功能。该功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的模块。
在一种可能的设计中，该装置包括：处理器、收发器、存储器；该存储器用于存储计算机执行指令，该收发器用于实现该装置与其他通信实体进行通信，该处理器与该存储器通过该总线连接，当该装置运行时，该处理器执行该存储器存储的该计算机执行指令，以使该PDU会话处理装置执行上述第五方面的方法。
第七方面，本申请实施例提供一种PDU会话处理方法，该方法可由终端执行，该方法包括：终端向第一核心网网元发送第一消息，所述第一消息包括切换指示信息，切换指示信息用于指示第一核心网网元将PDU会话从第二网络切换到第一网络；接着，终端接收来自第一核心网网元的第二消息，所述第二消息用于指示PDU会话处理结果。
在一种可能的设计中，所述第二消息用于指示建立PDU会话。
在一种可能的设计中，所述第二消息用于指示拒绝PDU会话切换。
在一种可能的设计中，所述第一消息中包括漫游状态信息。
在一种可能的设计中，第一消息中包括PDU会话对应的终端的IP连续性需求信息。
在一种可能的设计中，第一消息中包括PDU会话标识。
在一种可能的设计中，所述终端根据IP连续性需求信息，确定需要发起切换请求。
在一种可能的设计中，所述终端确定PDU会话的SSC mode为SSC mode1或SSC mode 3。
第八方面，本申请的实施例提供一种PDU会话处理装置，该装置具有实现上述方法实施例中终端的功能。该功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的模块。
在一种可能的设计中，该装置包括：处理器、收发器、存储器；该存储器用于存储计算机执行指令，该收发器用于实现该装置与其他通信实体进行通信，该处理器与该存储器通过该总线连接，当该装置运行时，该处理器执行该存储器存储的该计算机执行指令，以 使该PDU会话处理装置执行上述第七方面的方法。
第九方面，本申请的实施例提供一种PDU会话处理方法，包括：第一核心网网元通过第一网络接收来自终端的第一消息，所述第一消息包括切换指示信息，所述切换指示信息用于指示所述第一核心网网元将PDU会话从第二网络切换到所述第一网络；所述第一核心网网元根据所述PDU会话对应的会话管理网元的标识信息处理所述PDU会话的切换。
在一种可能的实现方式中，所述第一核心网网元根据所述PDU会话对应的会话管理网元的标识信息处理所述PDU会话的切换，包括：所述第一核心网网元根据所述会话管理网元标识的标识信息确定所述第一核心网网元能够连接到所述会话管理网元；所述第一核心网网元在所述第一网络建立所述PDU会话。
在一种可能的设计中，所述第一核心网网元根据所述会话管理网元的标识信息确定所述第一核心网网元与所述会话管理网元不属于同一PLMN，且所述会话管理网元所在的PLMN为拜访地PLMN，所述第一核心网网元拒绝在所述第一网络建立PDU会话。
在一种可能的实现方式中，所述第一核心网网元根据所述PDU会话对应的会话管理网元的标识信息处理所述PDU会话的切换，包括：所述第一核心网网元根据所述会话管理网元标识的标识信息确定所述第一核心网网元无法连接到所述会话管理网元；所述第一核心网网元拒绝在所述第一网络建立所述PDU会话。
在一种可能的实现方式中，所述第一核心网网元根据所述PDU会话对应的会话管理网元的标识信息处理所述PDU会话的切换，包括：所述第一核心网网元根据所述会话管理网元的标识信息确定所述第一核心网网元与所述会话管理网元属于同一公共陆地移动网络PLMN；所述第一核心网网元在所述第一网络建立所述PDU会话。
在一种可能的实现方式中，所述第一核心网网元根据所述PDU会话对应的会话管理网元的标识信息处理所述PDU会话的切换，包括：所述第一核心网网元根据所述会话管理网元的标识信息确定所述第一核心网网元与所述会话管理网元不属于同一PLMN；所述第一核心网网元拒绝在所述第一网络建立所述PDU会话。
在一种可能的实现方式中，所述会话管理网元的标识信息包括所述会话管理网元所在的PLMN的标识信息。
在一种可能的实现方式中，所述第一核心网网元从数据管理网元获取所述会话管理网元的标识信息。
在一种可能的实现方式中，所述第一核心网网元根据所述PDU会话对应的会话管理网元的标识信息处理所述PDU会话的切换，包括：所述第一核心网网元根据所述会话管理网元的标识信息和切换前后所述PDU会话对应的所述终端的互联网协议IP连续性需求信息，处理所述PDU会话的切换。
第十方面，本申请实施例提供了一种PDU会话处理装置，包括：收发单元和处理单元，所述收发单元用于通过第一网络接收来自终端的第一消息，所述第一消息包括切换指示信息，所述切换指示信息用于指示所述处理单元将PDU会话从第二网络切换到所述第一网络；所述处理单元用于根据所述PDU会话对应的会话管理网元的标识信息处理所述PDU会话的切换。
第十一方面，一种PDU会话处理装置，包括存储器、处理器和通信接口，所述存储器用于存储计算机指令；所述处理器用于根据所述存储器中存储的计算机指令执行如下操作： 利用所述通信接口通过第一网络接收来自终端的第一消息，所述第一消息包括切换指示信息，所述切换指示信息用于指示所述处理器将PDU会话从第二网络切换到所述第一网络；根据所述PDU会话对应的会话管理网元的标识信息处理所述PDU会话的切换。
第十二方面，本申请实施例提供了一种计算机存储介质，用于储存为第一核心网网元所用的计算机软件指令，其包含用于执行上述方面为第一核心网网元所设计的程序。
第十三方面，本申请实施例提供了一种计算机存储介质，用于储存为会话管理网元所用的计算机软件指令，其包含用于执行上述方面为会话管理网元所设计的程序。
第十四方面，本申请实施例提供了一种计算机存储介质，用于储存为终端所用的计算机软件指令，其包含用于执行上述方面为终端所设计的程序。
第十五方面，本申请实施例提供了一种计算机程序产品。该计算机程序产品包括计算机软件指令，该计算机软件指令可通过处理器进行加载来实现上述第一方面方法中的流程。
第十六方面，本申请实施例提供了一种计算机程序产品。该计算机程序产品包括计算机软件指令，该计算机软件指令可通过处理器进行加载来实现上述第三方面方法中的流程。
第十七方面，本申请实施例提供了一种计算机程序产品。该计算机程序产品包括计算机软件指令，该计算机软件指令可通过处理器进行加载来实现上述第五方面方法中的流程。
第十八方面，本申请实施例提供了一种计算机程序产品。该计算机程序产品包括计算机软件指令，该计算机软件指令可通过处理器进行加载来实现上述第七方面方法中的流程。
第十九方面，本申请实施例提供了一种芯片，包括处理器、收发组件，可选地，还包括存储器，用于执行上述方面的PDU会话处理方法。
另外，第二方面至第十九方面中任一种设计方式所带来的技术效果可参见第一方面中不同设计方式所带来的技术效果，此处不再赘述。
本申请的这些方面或其他方面在以下实施例的描述中会更加简明易懂。
附图说明
图1为本申请实施例应用的一种网络架构的示意图；
图2为本申请实施例应用的另一种网络架构的示意图；
图3为本申请实施例应用的再一种网络架构的示意图；
图4为本申请实施例提供的一种PDU会话处理方法示意图；
图5为本申请实施例提供的另一种PDU会话处理方法示意图；
图6为本申请实施例提供的另一种PDU会话处理方法示意图；
图7为本申请实施例提供的一种PDU会话处理装置；
图8为本申请实施例提供的另一种PDU会话处理装置；
图9为本申请实施例提供的再一种PDU会话处理装置。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行描述。方法实 施例中的具体操作方法也可以应用于装置实施例或系统实施例中。其中，在本申请的描述中，除非另有说明，“多个”的含义是两个或两个以上。
终端是一种具有无线收发功能的设备，可以部署在陆地上，包括室内或室外、手持或车载；也可以部署在水面上(如轮船等)；还可以部署在空中(例如飞机、气球和卫星上等)。所述终端可以是手机(mobile phone)、平板电脑(pad)、带无线收发功能的电脑、虚拟现实(virtual reality，VR)终端、增强现实(augmented reality，AR)终端、工业控制(industrial control)中的无线终端、无人驾驶(self driving)中的无线终端、远程医疗(remote medical)中的无线终端、智能电网(smart grid)中的无线终端、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端、智慧家庭(smart home)中的无线终端等等。本申请各实施例中，以终端为UE进行举例说明。
如图1～图3所示，为本申请实施例应用的网络架构的示意图。其中，图1为非漫游场景，图2为漫游本地分流(local breakout，LBO)场景，图3为漫游家乡路由(home routed，HR)场景。
针对图1所示的场景，该网络框架示意图包括用户设备(user equipment，UE)、3GPP接入网元、非3GPP接入网络(Non-3GPP)、N3IWF、AMF网元、会话管理功能(session management function，SMF)网元、用户面功能(user plane function，UPF)网元和数据网络(data Network，DN)网元等。
应理解的是，UE一般也称为终端，3GPP接入网元也称接入网网元(Radio Access network，R-AN)，例如5G中的基站。Non-3GPP接入网络是指3GPP以外的接入网络，如无线局域网(wireless local area networks，WLAN)接入网络。N3IWF类似于LTE中的演进的分组数据网关(evolved packet data gateway，ePDG)，在5G中用于UE通过非3GPP技术网络接入时，和UE建立互联网协议安全性(internet protocol security，IPsec)隧道。在未来5G定义中，N3IWF的名字可能会更改。
AMF网元负责终端的接入管理和移动性管理，在实际应用中，其包括了长期演进(long term evolution，LTE)中网络框架中移动管理实体移动性管理实体(mobility management entity，MME)里的移动性管理功能，并加入了接入管理功能。
会话管理功能SMF网元负责会话管理，如用户的会话建立等，也即是MME网元里的会话管理功能。UPF网元是终端用户面的功能网元，主要负责连接外部网络，其包括了LTE的服务网关(serving gateway，SGW)和公用数据网(public data network，PDN)网关(PDN-GW)的相关功能。数据网络网元DN负责为UE提供服务的网络，如一些DN为终端提供上网功能，另一些DN为终端提供短信功能等等。
图1所示的架构中，UE通过3GPP接入技术和非3GPP接入技术，接入的是同一个核心网。该核心网包括：AMF网元、SMF网元、UPF网元、DN网元等一些网元及网元之间的连接接口。图1所示的架构主要适用于非漫游场景。
图2和图3所示的架构，为漫游场景，终端通过3GPP接入技术和非3GPP接入技术，接入的是不同的核心网，与图1所示的非漫游场景的区别主要表现为：通过3GPP接入技术接入到核心网，与通过非3GPP接入技术接入到核心网，所使用的PLMN不同，以及，在漫游场景下，使用不同的AMF网元对终端进行管理控制。
另外，在图1～图3所示的任一场景下，终端经由3GPP或者非3GPP接入网络建立PDU 会话时，当进行PDU会话切换时，终端的IP地址在切换前后，可能需要发生变化，也可能不需要发生变化，其中，IP地址在切换前后不需要发生变化，也可以理解为需要保证终端的IP连续性，IP地址在切换前后需要发生变化，也可以理解为不需要保证终端的IP连续性。
可选地，在一种具体实现中，切换前后PDU会话对应的终端的IP连续性需求信息，可以根据终端的PDU会话在切换前后所连接的UPF是否发生变化来确定，例如，若终端的PDU会话在切换前后的UPF没有发生变化，即PDU会话具有UPF锚点，则认为IP地址在切换前后不需要发生变化；若终端的PDU会话在切换前后的UPF发生变化，即PDU会话不具有UPF锚点，则认为IP地址在切换前后需要发生变化。
可选地，在另一种具体实现中，切换前后PDU会话对应的终端的IP连续性需求信息，还可以是根据现有技术中定义的会话与业务连续性模式(Session and Service Continuity mode，SSC mode)来实现，例如，当PDU会话处于SSC mode 1时，则认为IP地址在切换前后不需要发生变化，当PDU会话处于SSC mode 2或SSC mode 3时，则认为IP地址在切换前后需要发生变化。其中，SSC mode的定义如下：
SSC mode 1：PDU会话的UPF锚点在切换前后不变，UE的IP地址也不变。
SSC mode 2：PDU会话的UPF在切换前后会发生变化，原PDU会话(即切换前的PDU会话)可以在新的PDU会话(即切换后的PDU会话)建立之前断开。
SSC mode 3：PDU会话的UPF在切换前后会发生变化，原PDU会话(即切换前的PDU会话)在新的PDU会话(即切换后的PDU会话)建立完成之后断开。
应理解的是，上述对于SSC mode的定义，其名称可能随着技术的发展而产生发生变化，但只要是符合上述定义的其它名称，也属于本申请的保护范围。
为方便说明，本申请中，第一网络指的是3GPP接入网络和非3GPP接入网络中的一种，第二网络指的是3GPP接入网络和非3GPP接入网络中的另一种。例如，第一网络为3GPP接入网络，第二网络为非3GPP接入网络，或者，第一网络为非3GPP接入网络，第二网络为3GPP接入网络。
以及，本申请中，第一网络为终端PDU会话切换后的接入网络，第二网络为终端PDU会话切换前的接入网络。
目前针对图1所示的架构下的终端，当终端的PDU会话从图1所示的第二网络切换至图1所示的第一网络时，其可以根据目前相关现有技术的方法，对PDU会话进行切换。但是，当终端处于图1所示的第二网络下，其需要切换至图2或图3所示的第一网络，或者，当终端处于图2或图3所示的第二网络下，其需要切换至图1或图2或图3所示的第一网络，则没有相关的解决方案。
对于存在的上述问题，本申请实施例提供一种PDU会话处理方法，如图4所示，为流程示意图，包括以下步骤：
步骤401、终端通过第一网络向第一核心网网元发送第一消息，第一核心网网元接收来自终端的第一消息。
其中，第一消息包括切换指示信息，用于指示第一核心网网元将PDU会话从第二网络切换至第一网络。
该PDU会话是由终端通过第二网络，在该步骤401之前建立的。
在一种可能的实现方式中，第一核心网网元可以是具有接入和移动性管理功能的网元，例如可以是AMF网元，且第一核心网网元为第一网络中的网元。例如，若第一核心网网元为图1中的网元，由于图1所示的架构中只有一个核心网，因此，第一核心网网元可以为图1中的AMF网元；再比如，若第一核心网网元为图2或图3中的网元，由于图2或图3均具有两个AMF网元，因此若当前终端的PDU会话处于3GPP接入网络，则第一核心网网元可以是非3GPP接入网络对应的核心网中的AMF网元，若当前终端的PDU会话处于非3GPP接入网络，则第一核心网网元可以是3GPP接入网络对应的核心网中的AMF网元。
在一种可能的实现方式中，该第一消息可以是PDU会话建立请求消息。
在一种可能的实现方式中，所述终端根据IP连续性需求信息，确定需要发起第一消息。
在一种可能的实现方式中，所述终端确定PDU会话的SSC mode为SSC mode1或SSC mode3。
步骤402、第一核心网网元获取该PDU会话的漫游状态信息，并根据漫游状态信息，处理该PDU会话的切换。
其中，该PDU会话的漫游状态信息用于指示PDU会话的漫游状态，例如包括本地分流，家乡路由、非漫游等，需要指出的是，随着通信技术的发展，后续可能会加入其它漫游状态，其仍然属于本申请的保护范围。
在一种可能的实现方式中，若PDU会话的漫游状态信息为家乡路由或非漫游，则第一核心网网元在第一网络建立PDU会话，即同意PDU会话从第二网络切换至第一网络，并在第一网络新建PDU会话。
在一种可能的实现方式中，若所述PDU会话的漫游状态信息为本地分流，且所述第一核心网网元与所述PDU会话对应的会话管理网元不属于同一PLMN，所述第一核心网网元拒绝在所述第一网络建立所述PDU会话。
在另一种可能的实现方式中，若PDU会话的漫游状态信息为本地分流，则第一核心网网元拒绝在第一网络建立PDU会话，即不同意PDU会话从第二网络切换至第一网络，并拒绝新建PDU会话。
在另一种可能的实现方式中，第一核心网网元还可以根据PDU会话的漫游状态信息和切换前后PDU会话对应的终端的IP连续性需求信息，处理PDU会话的切换。其中，切换前后PDU会话对应的终端的IP连续性需求信息可用于指示是否需要保证终端的IP连续性。
在一种可能的实现方式中，若PDU会话的漫游状态信息为本地分流，且需要保证所述终端的IP连续性，则第一核心网网元拒绝在第一网络建立PDU会话。例如，在一种实现中，当PDU会话的SSC mode为SSC mode 1时，第一核心网网元拒绝在第一网络建立PDU会话。
在一种可能的实现方式中，若PDU会话的漫游状态信息为本地分流，不需要保证所述终端的IP连续性，第一核心网网元在第一网络建立PDU会话。例如，在一种实现中，当PDU会话的SSC mode为SSC mode 2或SSC mode 3时，第一核心网网元在第一网络建立PDU会话。
在另一种可能的实现方式中，若PDU会话的SSC mode为SSC mode 2，则不管PDU会话的漫游状态信息为本地分流、家乡路由、或非漫游，则第一核心网网元均拒绝在第一网络建立PDU会话。
在另一种可能的实现方式中，若PDU会话的SSC mode为SSC mode1或SSC mode 3，且 PDU会话的漫游状态信息为家乡路由或非漫游，则第一核心网网元在第一网络建立PDU会话。
在另一种可能的实现方式中，若PDU会话的SSC mode为SSC mode1或SSC mode 3，且PDU会话的漫游状态信息为本地分流，则第一核心网网元拒绝在第一网络建立PDU会话。
上述实施例，当终端通过第一网络向第一核心网网元请求发送切换指示信息请求PDU会话切换时，第一核心网网元根据PDU会话的漫游状态信息，确定是否进行PDU会话切换，例如，确定PDU会话切换并新建PDU会话，或者是，拒绝PDU会话切换，从而给出了当终端处于漫游或非漫游场景下的PDU会话处理方法。
可选地，还可以根据PDU会话的漫游状态信息和切换前后PDU会话对应的所述终端的IP连续性需求信息，确定是否进行PDU会话切换。
在上述实施例中，可选地，PDU会话的漫游状态信息，例如可以是由第一核心网网元根据该PDU会话对应的会话管理网元标识信息确定的，可选地，会话管理网元可以是SMF网元，例如，第一核心网网元可从数据管理网元(例如，数据管理网元可以是UDM网元)中获取该PDU会话对应的会话管理网元标识信息，进一步的，该会话管理网元标识信息中包括PLMN标识，可以根据PLMN标识，确定该PDU会话的漫游状态信息。
在本申请的实施例中，该PDU会话对应的会话管理网元标识信息可以是切换前的PDU会话对应的会话管理网元的标识信息。
具体的，如果第一核心网网元处于拜访地公共陆地移动网络(VPLMN)，该PDU会话对应的会话管理网元处于归属地公共陆地移动网络(HPLMN),则所述PDU会话的漫游状态信息为家乡路由。如果第一核心网网元和该PDU会话对应的会话管理网元都处于HPLMN，则所述PDU会话的漫游状态信息为非漫游。如果第一核心网网元和该PDU会话对应的会话管理网元都处于VPLMN，则所述PDU会话的漫游状态信息为本地分流。
在本申请的实施例中，当所述PDU会话处于家乡路由状态时，所述会话管理网元为家乡域会话管理网元”。
在本申请的实施例中，为终端建立PDU会话的PLMN与第一核心网网元所在的PLMN相同。
在一种可能的实现方式中，第一核心网网元可以在注册过程中从数据管理网元获取该PDU会话对应的会话管理网元标识信息，具体方法可以参见现有技术。
可选地，PDU会话的漫游状态信息，还可以是终端在第二网络中建立该PDU会话过程中，由第二网络中的AMF网元发送给终端的，从而终端在上述步骤401中，通过第一网络向第一核心网网元发送第一消息时，可在该第一消息中携带PDU会话的漫游状态信息，从而第一核心网网元可从第一消息中获取PDU会话的漫游状态信息。
可选地，PDU会话的漫游状态信息，还可以是终端在第二网络中建立该PDU会话过程中，由会话管理网元(例如可以是SMF网元)存储至数据管理网元，从而第一核心网网元可从数据管理网元中获取PDU会话的漫游状态信息。
上述实施例中，可选地，PDU会话对应的终端的IP连续性需求信息可以是终端在第二网络中建立该PDU会话过程中，由会话管理网元存储至数据管理网元，从而第一核心网网元可从数据管理网元中获取PDU会话对应的终端的IP连续性需求信息。
可选地，PDU会话对应的终端的IP连续性需求信息，还可以是终端在上述步骤401中，通过第一网络向第一核心网网元发送第一消息时，可在该第一消息中携带PDU会话对应的 终端的IP连续性需求信息，从而第一核心网网元可从第一消息中获取PDU会话对应的终端的IP连续性需求信息。
可选地，在另一种实现方式中，若PDU会话的SSC mode为SSC mode 2，则不管PDU会话的漫游状态信息为本地分流、家乡路由、或非漫游，终端均不向第一核心网网元发送第一消息，即在该实现方式中，当PDU会话的SSC mode为SSC mode 2时，不执行本申请实施例提供的PDU会话处理方法。
本申请实施例提供另一种PDU会话处理方法。本实施例中与图4所示实施例中相同的部分参见图4实施例的描述。具体的，该方法包括：
第一核心网网元通过第一网络接收来自终端的第一消息，所述第一消息包括切换指示信息，所述切换指示信息用于指示所述第一核心网网元将PDU会话从第二网络切换到所述第一网络，具体参见步骤401的描述。所述第一核心网网元根据所述PDU会话对应的会话管理网元的标识信息处理所述PDU会话的切换。
具体的，第一核心网网元根据所述PDU会话对应的会话管理网元的标识信息处理所述PDU会话的切换，包括如下方式：
若所述第一核心网网元根据所述会话管理网元标识的标识信息确定所述第一核心网网元能够连接到所述会话管理网元，则所述第一核心网网元在所述第一网络建立所述PDU会话。在一种可能的实现方式中，若所述第一核心网网元根据所述会话管理网元的标识信息确定所述第一核心网网元与所述会话管理网元属于同一PLMN，则所述第一核心网网元能够连接到所述会话管理网元；或者，若所述第一核心网网元根据所述会话管理网元的标识信息确定为终端建立PDU会话的PLMN与所述会话管理网元属于同一PLMN，则所述第一核心网网元能够连接到所述会话管理网元。
若所述第一核心网网元根据所述会话管理网元标识的标识信息确定所述第一核心网网元无法连接到所述会话管理网元，则所述第一核心网网元拒绝在所述第一网络建立所述PDU会话。在一种可能的实现方式中，若所述第一核心网网元根据所述会话管理网元的标识信息确定所述第一核心网网元与所述会话管理网元不属于同一PLMN，则所述第一核心网网元无法连接到所述会话管理网元；或者，若所述第一核心网网元根据所述会话管理网元的标识信息确定为终端建立PDU会话的PLMN与所述会话管理网元不属于同一PLMN，则所述第一核心网网元无法连接到所述会话管理网元。
在一种可能的实现方式中，所述第一核心网网元根据所述会话管理网元的标识信息确定所述第一核心网网元与所述会话管理网元不属于同一PLMN，且所述会话管理网元所在的PLMN为拜访地PLMN，所述第一核心网网元拒绝在所述第一网络建立PDU会话。
本实施例中，所述会话管理网元所在的PLMN为VPLMN即表示所述PDU会话的漫游状态信息为本地分流。
本实施例中，会话管理网元的标识信息的具体内容参见步骤402的描述。
在一种可能的方式中，所述第一核心网网元根据所述会话管理网元的标识信息和切换前后所述PDU会话对应的所述终端的互联网协议IP连续性需求信息，处理所述PDU会话的切换。具体参见步骤402的描述。上述主要从各个网元之间交互的角度对本申请实施例提供的方案进行了介绍。可以理解的是，上述实现第一核心网网元，其包含了执行各个功能相应的硬件结构和/或软件模块。本领域技术人员应该很容易意识到，结合本文中所公开的 实施例描述的各示例的单元及算法步骤，本申请能够以硬件或硬件和计算机软件的结合形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
下面结合附图5～附图6，对本申请实施例提供的PDU会话处理方法进行举例说明。
如图5所示，为本申请实施例提供的一种PDU会话处理方法流程图，图5中的UE为本申请实施例的终端，AMF1网元为第一网络中的AMF网元，其为本申请实施例的第一核心网网元的一种实现方式，RAN1为第一网络中的接入网网元，AMF2为第二网络中的AMF网元，RAN2为第二网络中的接入网网元，SMF网元为会话管理网元的一种具体实现、策略控制功能(policy control function，PCF)网元可用于完成与分组数据有关的无线信道控制功能，对终端所进行的分组数据业务进行转换、管理与控制、UDM网元为数据管理网元的一种具体实现，可用于存储相关信息。需要说明的是，图5中的SMF网元、PCF网元、UDM网元、DN网元也有可能分别各有两个或多个，本领域技术人员可根据其具体应用场景，对核心网网元的具体设置进行推断。
图5所示的方法包括以下步骤：
步骤1、UE通过第二网络建立PDU会话。
第二网络为UE(即终端)的该PDU会话当前所在的接入网络。
步骤2、SMF网元存储相关信息。
在第二网络建立PDU会话的过程中，SMF网元可将SMF标识信息，PDU会话标识存储至UDM网元。
其中，若5G架构中有多个SMF网元，则该SMF网元指的是第二网络中的SMF网元。
可选地，SMF网元还将漫游状态信息存储至UDM网元。
可选地，SMF网元还将PDU会话对应的终端的IP连续性需求信息存储至UDM网元。一种可能的实现方式为，SMF网元将PDU会话的SSC mode存储至UDM。
可选的，SMF网元还可以先确定UDM是否存储有PDU会话对应的漫游状态信息。若UDM没有存储PDU会话对应的漫游状态信息，SMF网元向UDM发送漫游状态信息。
步骤3、UE通过第一网络向AMF1网元发送PDU会话建立请求消息。
其中，AMF1为第一网络中的第一核心网网元。
该PDU会话建立请求消息中包含切换指示信息，可选地，还包括PDU会话标识。
步骤4、AMF1网元确定SMF网元。
该步骤中，AMF1网元判断本地是否可以查找到该PDU会话对应的SMF网元，若本地查找到了该PDU会话对应SMF网元，则表明5G架构中只有一个核心网，即只有一个SMF网元，例如如图1所示的架构，此时，可按照现有技术相关方法做PDU会话切换，不属于本申请的讨论范围；若本地没有查找到该PDU会话对应的SMF网元，则从UDM网元中查找SMF网元。可选地，若SMF网元中存储有该PDU会话对应的会话漫游信息，则还从UDM网元获取该PDU会话对应的会话漫游信息。可选地，若SMF网元中存储有该PDU会话对应的终端的IP连续性需求信息，则还从UDM网元获取该PDU会话对应的终端的IP连续性需求信息。可选地，若PDU会话建立请求消息中携带有该PDU会话对应的会话漫游信息，则从PDU会话建立请求消息中获取该PDU会话对应的会话漫游信息。可选地，若PDU会话建立请求消息 中携带有该PDU会话对应的终端的IP连续性需求信息，则从PDU会话建立请求消息中获取该PDU会话对应的终端的IP连续性需求信息。
步骤5、当AMF1确定该PDU会话可切换时，则AMF1通过第一网络建立PDU会话。
步骤6、通过第一网络释放PDU会话，流程结束。
可选地，若该PDU会话对应SSC mode1，则由AMF1网元向UE发起PDU会话释放流程；若该PDU会话对应SSC mode 2或SSC mode 3，则由UE向AMF1网元发送PDU会话释放流程。
步骤7、当AMF1网元确定该PDU会话不可切换时，则AMF1网元拒绝建立PDU会话，流程结束。
可选地，AMF1网元向UE发送拒绝切换的消息。
需要说明的是，上述步骤5和步骤7不同时执行，以及，上述步骤中只是描述了与本申请相关的处理流程，其具体实现细节在图中并未完全示出，本领域技术人员有能力结合本申请与现有技术，推断其具体实现方式。
如图6所示，为本申请实施例提供的另一种PDU会话处理方法流程图，其与图5所示的流程图总体相同，二者之间的主要区别在于：图6所示的流程中，在步骤1之后增加步骤1a、AMF2网元向UE发送PDU会话建立接受消息，该消息中包括漫游状态信息，以及，步骤3中UE向AMF1网元发送的PDU会话建立请求消息中包括该漫游状态信息，也就是说，PDU会话的漫游状态信息是由UE通过PDU会话建立请求消息发送至AMF1网元的。对于图6所示的流程中的其它步骤的具体实现方式，可参考图5所示的实施例中相关描述，此处不再赘述。
需要说明的是，图5和图6所示的实施例，仅仅是作为具体实现方式的示例，在实际应用中，还可以有其它实现方式，只要其实现技术手段符合图4所示的流程，均应属于本申请的保护范围。
如图7所示，本申请实施例还提供一种PDU会话处理装置700，包括至少一个处理器71，通信总线72，存储器73以及至少一个通信接口74。该装置700可以是本申请实施例中的第一核心网网元，例如可以是图1～图3中的AMF网元，以及，还可以是图5、图6中的AMF1网元，该装置700可用于执行本申请实施例上述方法。
处理器71可以是一个通用中央处理器(CPU)，微处理器，特定应用集成电路(application-specific integrated circuit，ASIC)，或一个或多个用于控制本申请方案程序执行的集成电路。
通信总线72可包括一通路，在上述组件之间传送信息。所述通信接口74，使用任何收发器一类的装置，用于与其他设备或通信网络通信，如以太网，无线接入网(RAN)，WALN等。
存储器73可以是只读存储器(read-only memory，ROM)或可存储静态信息和指令的其他类型的静态存储设备，随机存取存储器(random access memory，RAM)或者可存储信息和指令的其他类型的动态存储设备，也可以是电可擦可编程只读存储器(Electrically Erasable Programmable Read-Only Memory，EEPROM)、只读光盘(Compact Disc Read-Only Memory，CD-ROM)或其他光盘存储、光碟存储(包括压缩光碟、激光碟、光碟、数字通用光碟、蓝光光碟等)、磁盘存储介质或者其他磁存储设备、或者能够用于携带或存储具有指令或数据结构形式的期望的程序代码并能够由该装置存取的任何其他介质，但不限于此。 存储器可以是独立存在，通过总线与处理器相连接。存储器也可以和处理器集成在一起。
其中，所述存储器73用于存储执行本申请方案的应用程序代码，并由处理器71来控制执行。所述处理器71用于执行所述存储器73中存储的应用程序代码。
在具体实现中，作为一种实施例，处理器71可以包括一个或多个CPU，例如图7中的CPU0和CPU1。
在具体实现中，作为一种实施例，该装置700可以包括多个处理器，例如图7中的处理器71和处理器78。这些处理器中的每一个可以是一个单核(single-CPU)处理器，也可以是一个多核(multi-CPU)处理器。这里的处理器可以指一个或多个设备、电路、和/或用于处理数据(例如计算机程序指令)的处理核。
示例性的，图1～图3中的AMF网元可以为图7所示的装置，AMF网元的存储器中存储了一个或多个软件模块。AMF网元可以通过处理器以及存储器中的程序代码来实现软件模块，实现PDU会话的处理。
又或者，图4中的第一核心网网元可以为图7所示的装置，第一核心网网元的存储器中存储了一个或多个软件模块。第一核心网网元可以通过处理器以及存储器中的程序代码来实现软件模块，实现PDU会话的处理。
又或者，图5～图6中的AMF1网元可以为图7所示的装置，AMF1网元的存储器中存储了一个或多个软件模块。AMF1网元可以通过处理器以及存储器中的程序代码来实现软件模块，实现PDU会话的处理。
本申请实施例可以根据上述方法示例对第一核心网网元进行功能模块的划分，例如，可以对应各个功能划分各个功能模块，也可以将两个或两个以上的功能集成在一个处理模块中。上述集成的模块既可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。需要说明的是，本申请实施例中对模块的划分是示意性的，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式。
比如，在采用对应各个功能划分各个功能模块的情况下，图8示出了上述实施例中所涉及的一种PDU会话处理装置可能的结构示意图，该装置800可以是上述实施例中的第一核心网网元、会话管理网元或终端。该装置800包括处理单元801、收发单元802。
当该装置800为第一核心网网元时，收发单元，通过第一网络接收来自终端的第一消息，第一消息包括切换指示信息，切换指示信息用于指示第一核心网网元将分组数据单元PDU会话从第二网络切换到第一网络；
处理单元，用于根据PDU会话的漫游状态信息，处理PDU会话的切换。
可选地，处理单元，具体用于：若PDU会话的漫游状态信息为家乡路由或非漫游，则在第一网络建立PDU会话。
可选地，处理单元，具体用于：若PDU会话的漫游状态信息为本地分流，则拒绝在第一网络建立PDU会话。
可选地，处理单元，具体用于：若所述PDU会话的漫游状态信息为本地分流，且所述第一核心网网元与所述PDU会话在所述第一网络中对应的会话管理网元不属于同一PLMN，所述第一核心网网元拒绝在所述第一网络建立所述PDU会话。
可选地，处理单元，具体用于：
根据PDU会话的漫游状态信息和切换前后PDU会话对应的终端的互联网协议IP连续性 需求信息，处理PDU会话的切换。
可选地，处理单元，具体用于：
若PDU会话的漫游状态信息为本地分流，且需要保证终端的IP连续性，则拒绝在第一网络建立PDU会话。
可选地，处理单元，具体用于：
若PDU会话的漫游状态信息为本地分流，且不需要保证终端的IP连续性，则在第一网络建立PDU会话。
可选地，处理单元，还用于：
根据PDU会话对应的会话管理网元标识信息，确定PDU会话的漫游状态信息。
可选地，处理单元，还用于：
从数据管理网元获取PDU会话的漫游状态信息。
可选地，第一消息还包括漫游状态信息；处理单元，还用于：从第一消息中获取PDU会话的漫游状态信息。
可选地，处理单元，还用于：
从统一数据管理UDM网元获取PDU会话对应的终端的IP连续性需求信息。
可选地，第一消息还包括PDU会话对应的终端的IP连续性需求信息；处理单元，还用于：从第一消息中获取PDU会话对应的终端的IP连续性需求信息。
在另一种实现方式中，收发单元，用于通过第一网络接收来自终端的第一消息，第一消息包括切换指示信息，切换指示信息用于指示第一核心网网元将分组数据单元PDU会话从第二网络切换到第一网络；
处理单元，用于在PDU会话的SSC mode为SSC mode 2时，拒绝PDU会话的切换。
当该装置800为会话管理网元时，处理单元，用于将PDU会话的漫游状态信息、PDU会话对应的终端的IP连续性需求信息、会话管理网元标识信息中的一种或多种信息，存储至数据管理网元。
可选地，该数据管理网元可以是UDM网元。
当该装置800为终端时，收发单元，用于向第一核心网网元发送第一消息，第一消息包括切换指示信息，切换指示信息用于指示第一核心网网元将PDU会话从第二网络切换到第一网络；收发单元，还用于接收来自第一核心网网元的第二消息，第二消息用于指示PDU会话处理结果。
可选地，第二消息用于指示建立PDU会话。
可选地，第二消息用于指示拒绝PDU会话切换。
可选地，第一消息中包括漫游状态信息。
可选地，第一消息中包括PDU会话对应的终端的IP连续性需求信息。
可选地，第一消息中包括PDU会话标识。
在本实施例中，该装置以对应各个功能划分各个功能模块的形式来呈现，或者，该装置以采用集成的方式划分各个功能模块的形式来呈现。这里的“模块”可以指特定应用集成电路(application-specific integrated circuit，ASIC)，电路，执行一个或多个软件或固件程序的处理器和存储器，集成逻辑电路，和/或其他可以提供上述功能的器件。在一个简单的实施例中，本领域的技术人员可以想到实现PDU会话处理装置800可以采用图7 所示的形式。比如，图8中的处理单元801、收发单元802可以通过图7的处理器71(和/或处理器78)和存储器73来实现，具体的，处理单元801、收发单元802可以通过由处理器71(和/或处理器78)来调用存储器73中存储的应用程序代码来执行，本申请实施例对此不作任何限制。
图9是本申请实施例提供的一种PDU会话处理装置的示意图。该PDU会话处理装置包括收发单元901、处理单元902以及存储单元903。收发单元901、处理单元902以及存储单元903可以是在物理上相互分离的单元，也可以集成到一个或者多个物理单元中，在此不做限定。
收发单元901用于实现处理单元902与其他单元或者网元的内容交互。具体的，收发单元901可以是该PDU会话处理装置的通信接口，也可以是收发电路或者收发器，还可以是收发信机。收发单元901还可以是处理单元902的通信接口或者收发电路。可选的，收发单元901可以是一个收发芯片。
虽然图9中仅仅示出了一个收发单元901，PDU会话处理装置也可以包括多个收发单元901，或者收发单元901包括多个子收发单元。收发单元901还可以包括发送单元和接收单元，用于执行对应的发送和接收操作。
处理单元902用于实现PDU会话处理装置对数据的处理。处理单元902可以是处理电路，也可以是处理器。其中，处理器可以是中央处理器(central processing unit，CPU)，网络处理器(network processor，NP)或者CPU和NP的组合。处理器还可以进一步包括硬件芯片。上述硬件芯片可以是专用集成电路(application-specific integrated circuit，ASIC)，可编程逻辑器件(programmable logic device，PLD)或其组合。上述PLD可以是复杂可编程逻辑器件(complex programmable logic device,CPLD)，现场可编程逻辑门阵列(field-programmable gate array，FPGA)，通用阵列逻辑(Generic Array Logic，GAL)或其任意组合。
虽然图9中仅仅示出了一个处理单元902，PDU会话处理装置也可以包括多个处理单元或者处理单元902包括多个子数据处理单元。具体的，处理器可以是一个单核(single-CPU)处理器，也可以是一个多核(multi-CPU)处理器。
存储单元903用于存储处理单元902执行的计算机指令。存储单元903可以是存储电路也可以是存储器。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。
存储单元903可以是独立于处理单元902的单元，也可以是处理单元902中的存储单元，在此不做限定。虽然图9中仅仅示出了一个存储单元903，PDU会话处理装置也可以包括多个存储单元903或者存储单元903包括多个子存储单元。
在本申请的各实施例中，处理单元902可以通过收发单元901与其他网元进行内容交互，例如：处理单元902获取或者接收来自其他网元的内容。若处理单元902与收发单元901是物理上分离的两个部件，处理单元902可以不经过收发单元901与PDU会话处理装置内部的其他单元进行内容交互。
一种可能的实现方式中，收发单元901、处理单元902以及存储单元603可以通过总线相互连接。总线可以是外设部件互连标准(peripheral component interconnect，PCI)总线或扩展工业标准结构(extended industry standard architecture，EISA)总线等。所述总线可以分为地址总线、数据总线、控制总线等。
在本申请的实施例中，处理单元902根据存储单元903中存储的计算机指令，使得PDU 会话处理装置实现本申请图4-6中任意一个实施例中的方法。
在本申请的实施例中，PDU会话处理装置可以是数据处理芯片或者数据处理芯片模块，例如片上系统(System on Chip,SoC)。
具体的，PDU会话处理装置可以是接入和移动性管理网元，会话管理网元或者终端设备。
当PDU会话处理装置为接入和移动性管理网元时，在一种可能的实现方式中，所述收发单元901用于通过第一网络接收来自终端的第一消息，所述第一消息包括切换指示信息，所述切换指示信息用于指示所述处理单元902将PDU会话从第二网络切换到所述第一网络；所述处理单元用于根据所述PDU会话对应的会话管理网元的标识信息处理所述PDU会话的切换。
在一种可能的实现方式中，所述处理单元902用于根据所述会话管理网元标识的标识信息确定所述PDU会话处理装置能够连接到所述会话管理网元；所述处理单元902用于在所述第一网络建立所述PDU会话。
在一种可能的实现方式中，所述处理单元902用于根据所述会话管理网元标识的标识信息确定所述PDU会话处理装置无法连接到所述会话管理网元；所述处理单元902用于拒绝在所述第一网络建立所述PDU会话。
在一种可能的实现方式中，所述处理单元902用于根据所述会话管理网元的标识信息确定所述第一核心网网元与所述会话管理网元不属于同一PLMN，且所述会话管理网元所在的PLMN为拜访地PLMN；所述处理单元902用于拒绝在所述第一网络建立PDU会话。
在一种可能的实现方式中，所述处理单元902用于根据所述会话管理网元的标识信息确定所述PDU会话处理装置与所述会话管理网元属于同一公共陆地移动网络PLMN；所述处理单元902用于在所述第一网络建立所述PDU会话。
在一种可能的实现方式中，所述处理单元902用于根据所述会话管理网元的标识信息确定所述PDU会话处理装置与所述会话管理网元不属于同一PLMN；所述处理单元902用于拒绝在所述第一网络建立所述PDU会话。
在一种可能的实现方式中，所述会话管理网元的标识信息包括所述会话管理网元所在的PLMN的标识信息。
在一种可能的实现方式中，所述收发单元901还用于从数据管理网元获取所述会话管理网元的标识信息。
在一种可能的实现方式中，所述处理单元902用于根据所述会话管理网元的标识信息和切换前后所述PDU会话对应的所述终端的互联网协议IP连续性需求信息，处理所述PDU会话的切换。
在本实施例中，收发单元901用于实现本申请图5或图6对应的实施例中AMF网元与外部网元的内容收发操作。处理单元902用于实现本申请图5或图6对应的实施例中AMF网元内部数据或者信令的处理操作,
在本实施例中，处理单元902根据存储单元903中存储的计算机指令，使得所述PDU会话处理装置实现本申请图5或图6对应的实施例中AMF网元的操作，例如：
利用所述收发单元901通过第一网络接收来自终端的第一消息，所述第一消息包括切换指示信息，所述切换指示信息用于指示所述处理单元902将PDU会话从第二网络切换到所述第一网络；根据所述PDU会话对应的会话管理网元的标识信息处理所述PDU会话的切换。
本申请实施例提供另一种PDU会话处理装置，包括存储单元903、处理单元902和收发单元901，所述存储单元903用于存储计算机指令；所述处理单元902用于根据所述存储单元903中存储的计算机指令执行如下操作：利用所述收发单元901接收来自终端的第一消息，所述第一消息包括切换指示信息，所述切换指示信息用于指示所述处理单元902将PDU会话从第二网络切换到所述第一网络；根据所述PDU会话的漫游状态信息，处理所述PDU会话的切换。
在一种可能的实现方式中，收发单元901可以为该PDU会话处理装置的通信接口，处理单元902可以为该PDU会话处理装置的处理器，存储单元903可以为该PDU会话处理装置的存储器。
本申请实施例还提供了一种计算机存储介质，用于储存为上述图7、图8所示的PDU会话处理装置所用的计算机软件指令，其包含用于执行上述方法实施例所设计的程序代码。通过执行存储的程序代码，可以实现PDU会话的处理。
本申请实施例还提供了计算机程序产品。该计算机程序产品包括计算机软件指令，该计算机软件指令可通过处理器进行加载来实现上述方法实施例中的方法。
本申请实施例还提供一种芯片，该芯片包括处理器和收发组件，可选地，还包括存储单元，可用于执行本申请上述实施例的方法。
尽管在此结合各实施例对本申请进行了描述，然而，在实施所要求保护的本申请过程中，本领域技术人员通过查看所述附图、公开内容、以及所附权利要求书，可理解并实现所述公开实施例的其他变化。在权利要求中，“包括”(comprising)一词不排除其他组成部分或步骤，“一”或“一个”不排除多个的情况。单个处理器或其他单元可以实现权利要求中列举的若干项功能。相互不同的从属权利要求中记载了某些措施，但这并不表示这些措施不能组合起来产生良好的效果。
本领域技术人员应明白，本申请的实施例可提供为方法、装置(设备)、或计算机程序产品。因此，本申请可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式，这里将它们都统称为“模块”或“系统”。而且，本申请可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。计算机程序存储/分布在合适的介质中，与其它硬件一起提供或作为硬件的一部分，也可以采用其他分布形式，如通过Internet或其它有线或无线电信系统。
本申请是参照本申请实施例的方法、装置(设备)和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
尽管结合具体特征及其实施例对本申请进行了描述，显而易见的，在不脱离本申请的精神和范围的情况下，可对其进行各种修改和组合。相应地，本说明书和附图仅仅是所附权利要求所界定的本申请的示例性说明，且视为已覆盖本申请范围内的任意和所有修改、变化、组合或等同物。显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的精神和范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (30)

  1. 一种分组数据单元PDU会话处理方法，其特征在于，包括：
    第一核心网网元通过第一网络接收来自终端的第一消息，所述第一消息包括切换指示信息，所述切换指示信息用于指示所述第一核心网网元将PDU会话从第二网络切换到所述第一网络；
    所述第一核心网网元根据所述PDU会话对应的会话管理网元的标识信息处理所述PDU会话的切换。
  2. 根据权利要求1所述的方法，其特征在于，所述第一核心网网元根据所述PDU会话对应的会话管理网元的标识信息处理所述PDU会话的切换，包括：
    所述第一核心网网元根据所述会话管理网元标识的标识信息确定所述第一核心网网元能够连接到所述会话管理网元；
    所述第一核心网网元在所述第一网络建立所述PDU会话。
  3. 根据权利要求1所述的方法，其特征在于，所述第一核心网网元根据所述PDU会话对应的会话管理网元的标识信息处理所述PDU会话的切换，包括：
    所述第一核心网网元根据所述会话管理网元标识的标识信息确定所述第一核心网网元无法连接到所述会话管理网元；
    所述第一核心网网元拒绝在所述第一网络建立所述PDU会话。
  4. 根据权利要求1所述的方法，其特征在于，所述第一核心网网元根据所述PDU会话对应的会话管理网元的标识信息处理所述PDU会话的切换，包括：
    所述第一核心网网元根据所述会话管理网元的标识信息确定所述第一核心网网元与所述会话管理网元属于同一公共陆地移动网络PLMN；
    所述第一核心网网元在所述第一网络建立所述PDU会话。
  5. 根据权利要求1所述的方法，其特征在于，所述第一核心网网元根据所述PDU会话对应的会话管理网元的标识信息处理所述PDU会话的切换，包括：
    所述第一核心网网元根据所述会话管理网元的标识信息确定所述第一核心网网元与所述会话管理网元不属于同一PLMN；
    所述第一核心网网元拒绝在所述第一网络建立所述PDU会话。
  6. 根据权利要求1所述的方法，其特征在于，所述第一核心网网元根据所述PDU会话对应的会话管理网元的标识信息处理所述PDU会话的切换，包括：
    所述第一核心网网元根据所述会话管理网元的标识信息确定所述第一核心网网元与所述会话管理网元不属于同一PLMN，且所述会话管理网元所在的PLMN为拜访地PLMN，所述第一核心网网元拒绝在所述第一网络建立PDU会话。
  7. 根据权利要求4-6中任意一项所述的方法，其特征在于，所述会话管理网元的标识信息包括所述会话管理网元所在的PLMN的标识信息。
  8. 根据权利要求1-7中任意一项所述的方法，其特征在于，所述第一核心网网元从数据管理网元获取所述会话管理网元的标识信息。
  9. 一种分组数据单元PDU会话处理方法，其特征在于，包括：
    第一核心网网元通过第一网络接收来自终端的第一消息，所述第一消息包括切换指示 信息，所述切换指示信息用于指示所述第一核心网网元将PDU会话从第二网络切换到所述第一网络；
    所述第一核心网网元根据所述PDU会话的漫游状态信息，处理所述PDU会话的切换。
  10. 根据权利要求9所述的方法，其特征在于，所述第一核心网网元根据所述PDU会话的漫游状态信息，处理所述PDU会话的切换，包括：
    若所述PDU会话的漫游状态信息为家乡路由或非漫游，所述第一核心网网元在所述第一网络建立PDU会话。
  11. 根据权利要求9所述的方法，其特征在于，所述第一核心网网元根据所述PDU会话的漫游状态信息，处理所述PDU会话的切换，包括：
    若所述PDU会话的漫游状态信息为本地分流，所述第一核心网网元拒绝在所述第一网络建立PDU会话。
  12. 根据权利要求9所述的方法，其特征在于，所述第一核心网网元根据所述PDU会话的漫游状态信息，处理所述PDU会话的切换，包括：
    若所述PDU会话的漫游状态信息为本地分流，且所述第一核心网网元与所述PDU会话对应的会话管理网元不属于同一PLMN，所述第一核心网网元拒绝在所述第一网络建立所述PDU会话。
  13. 根据权利要求9至12任一所述的方法，其特征在于，所述方法还包括：
    所述第一核心网网元根据所述PDU会话对应的会话管理网元的标识信息，确定所述PDU会话的漫游状态信息。
  14. 根据权利要求9至13任一所述的方法，其特征在于，所述方法还包括：
    所述第一核心网网元从数据管理网元获取所述PDU会话的漫游状态信息。
  15. 一种PDU会话处理装置，其特征在于，包括：收发单元和处理单元，
    所述收发单元用于通过第一网络接收来自终端的第一消息，所述第一消息包括切换指示信息，所述切换指示信息用于指示所述处理单元将PDU会话从第二网络切换到所述第一网络；
    所述处理单元用于根据所述PDU会话对应的会话管理网元的标识信息处理所述PDU会话的切换。
  16. 根据权利要求15所述的装置，其特征在于，
    所述处理单元用于根据所述会话管理网元标识的标识信息确定所述PDU会话处理装置能够连接到所述会话管理网元；
    所述处理单元用于在所述第一网络建立所述PDU会话。
  17. 根据权利要求15所述的装置，其特征在于，
    所述处理单元用于根据所述会话管理网元标识的标识信息确定所述PDU会话处理装置无法连接到所述会话管理网元；
    所述处理单元用于拒绝在所述第一网络建立所述PDU会话。
  18. 根据权利要求15所述的装置，其特征在于，
    所述处理单元用于根据所述会话管理网元的标识信息确定所述PDU会话处理装置与所述会话管理网元属于同一公共陆地移动网络PLMN；
    所述处理单元用于在所述第一网络建立所述PDU会话。
  19. 根据权利要求15所述的装置，其特征在于，
    所述处理单元用于根据所述会话管理网元的标识信息确定所述PDU会话处理装置与所述会话管理网元不属于同一PLMN；
    所述处理单元用于拒绝在所述第一网络建立所述PDU会话。
  20. 根据权利要求15所述的装置，其特征在于，
    所述处理单元用于根据所述会话管理网元的标识信息确定所述第一核心网网元与所述会话管理网元不属于同一PLMN，且所述会话管理网元所在的PLMN为拜访地PLMN；
    所述处理单元用于拒绝在所述第一网络建立PDU会话。
  21. 根据权利要求18-20中任意一项所述的装置，其特征在于，
    所述会话管理网元的标识信息包括所述会话管理网元所在的PLMN的标识信息。
  22. 根据权利要求15-21中任意一项所述的装置，其特征在于，所述收发单元还用于从数据管理网元获取所述会话管理网元的标识信息。
  23. 一种PDU会话处理装置，其特征在于，包括：收发单元和处理单元，
    所述收发单元用于通过第一网络接收来自终端的第一消息，所述第一消息包括切换指示信息，所述切换指示信息用于指示所述处理单元将分组数据单元PDU会话从第二网络切换到所述第一网络；
    所述处理单元用于根据所述PDU会话的漫游状态信息，处理所述PDU会话的切换。
  24. 根据权利要求23所述的装置，其特征在于，所述处理单元，具体用于：
    若所述PDU会话的漫游状态信息为家乡路由或非漫游，则在所述第一网络建立PDU会话。
  25. 根据权利要求23所述的装置，其特征在于，所述处理单元，具体用于：
    若所述PDU会话的漫游状态信息为本地分流，则拒绝在所述第一网络建立PDU会话。
  26. 根据权利要求23所述的装置，其特征在于，所述处理单元，具体用于：若所述PDU会话的漫游状态信息为本地分流，且所述第一核心网网元与所述PDU会话对应的会话管理网元不属于同一PLMN，所述第一核心网网元拒绝在所述第一网络建立所述PDU会话。
  27. 根据权利要求23至26任一所述的装置，其特征在于，所述处理单元，还用于：
    根据所述PDU会话在所述第一网络中对应的会话管理网元标识信息，确定所述PDU会话的漫游状态信息。
  28. 根据权利要求23至27任一所述的装置，其特征在于，所述处理单元，还用于：
    从数据管理网元获取所述PDU会话的漫游状态信息。
  29. 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中存储有指令，当所述指令在计算机上运行时，使得计算机执行如权利要求1-14任意一项所述的方法。
  30. 一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机执行所述权利要求1-14中任意一项所述的方法。
PCT/CN2018/091906 2017-06-20 2018-06-20 一种pdu会话处理方法及装置 WO2018233615A1 (zh)

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CA3063251A CA3063251A1 (en) 2017-06-20 2018-06-20 Pdu session processing method and apparatus
BR112019024636-3A BR112019024636A2 (pt) 2017-06-20 2018-06-20 Aparelho, método, sistema e meio de armazenamento de processamento de sessão pdu
KR1020197036099A KR20200003906A (ko) 2017-06-20 2018-06-20 Pdu 세션 처리 방법 및 장치
EP18820506.6A EP3621352B1 (en) 2017-06-20 2018-06-20 Pdu session processing method and device
JP2019570063A JP2020524459A (ja) 2017-06-20 2018-06-20 Ｐｄｕセッション処理方法および装置
US16/720,291 US20200128461A1 (en) 2017-06-20 2019-12-19 Pdu session processing method and apparatus

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