Session release processing methods, apparatus, equipment, media, and program products

Abstract

This application relates to a method, apparatus, device, medium, and program product for session release. The method includes: an AMF receiving a first message from a user terminal (UE); determining the access technology type of the released Multiple Access Protocol Data Unit (PDU) session based on the first message; and sending a second message to a Session Management Control (SMF), the second message including information for determining the access technology type of the released PDU session. Without utilizing N3IWF functional devices, the process of releasing a user plane connection for a multi-access PDU session is achieved through interaction between the UE, AMF, and SMF.

Description

Technical Field

[0001] This application relates to the field of wireless communication technology, and in particular to a method, apparatus, device, medium, and program product for processing session release. Background Technology

[0002] When a terminal establishes a Protocol Data Unit (PDU) session service supporting multiple connections through various access technologies, it can simultaneously use two independent data transmission channels corresponding to one 3GPP access network and one non-3GPP access network. In some application scenarios, a session release process needs to be performed on either the 3GPP side or the non-3GPP side to release the data transmission channel on either side.

[0003] In traditional technology, signaling is transmitted through N3IWF functional equipment in the data transmission channel corresponding to non-3GPP access networks, thereby realizing PDU session release.

[0004] However, in scenarios where the data transmission channel on the non-3GPP access side is controlled by the control signaling of the 3GPP access side, when the PDU session release process is initiated on the 3GPP access side, the data transmission channel of the released PDU session cannot be determined. Summary of the Invention

[0005] This application provides a method, apparatus, device, medium, and program product for processing session release, thereby enabling session release.

[0006] A method for handling session release, the method being applied to an Access and Mobility Management Function (AMF) network element, the method comprising:

[0007] Receive the first message sent by the user terminal (UE);

[0008] Based on the first message, determine the access technology type of the released Multi-Access Protocol Data Unit (PDU) session;

[0009] A second message is sent to the Session Management Control Network Element (SMF), the second message including information for determining the access technology type of the released PDU session.

[0010] In one embodiment, the first message includes first indication information; the first indication information is access technology information, or information used to indicate signaling connections, or information used to indicate user plane connections.

[0011] In one embodiment, determining the access technology type of the released Multi-Access Protocol Data Unit (PDU) session based on the first message includes:

[0012] The access technology type of the released PDU session is determined based on the first indication information.

[0013] In one embodiment, the first message sent by the receiving UE includes:

[0014] Receive the PDU session release request message sent by the UE;

[0015] Alternatively, receive the PDU session modification request message sent by the UE.

[0016] A method for handling session release, the method being applied to SMF, the method comprising:

[0017] Receive the third message sent by AMF;

[0018] The access technology type of the released PDU session is determined based on the third message;

[0019] Initiate a PDU session release process based on the access technology type.

[0020] In one embodiment, the third message includes second indication information, which is access technology information, or information indicating signaling connection, or information indicating user plane connection; the second indication information is first indication information sent by the UE and received by the AMF, or the second indication information is determined by the AMF based on the first indication information sent by the UE.

[0021] In one embodiment, determining the access technology type of the released PDU session based on the third message includes:

[0022] The access technology type of the released PDU session is determined based on the second indication information.

[0023] A method for handling session release, the method being applied to a UE, the method comprising:

[0024] Send a first message to the AMF so that the AMF can instruct the SMF to determine the access technology type of the released PDU session based on the first message.

[0025] Alternatively, the AMF may send a first indication message to the SMF, so that the SMF can determine the access technology type of the released PDU session based on the first indication message.

[0026] In one embodiment, the first message includes first indication information, which is used to determine the access technology type of the released PDU session; the first indication information is access technology information, or information used to indicate signaling connection, or information used to indicate user plane connection.

[0027] A method for handling session release, the method being applied to AMF, the method comprising:

[0028] Receive the fourth message sent by SMF;

[0029] Based on the fourth message, determine the access technology type of the released PDU session;

[0030] A fifth message is sent to the UE, the fifth message including information for determining the access technology type of the released PDU session.

[0031] In one embodiment, the fifth message includes third indication information to instruct the UE to determine the access technology type of the released PDU session based on the third indication information.

[0032] In one embodiment, the fourth message includes fourth indication information; the fourth indication information is access technology information, or information used to indicate signaling connections, or information used to indicate user plane connections.

[0033] In one embodiment, determining the access technology type of the released PDU session based on the fourth message includes:

[0034] Based on the fourth indication information, the access technology type of the released PDU session is determined.

[0035] In one embodiment, receiving the fourth message sent by the SMF includes:

[0036] Receive the PDU session release request message sent by the SMF;

[0037] Alternatively, receive the PDU session modification request message sent by the SMF.

[0038] A method for handling session release, the method being applied to SMF, the method comprising:

[0039] Send a fourth message to the AMF so that the AMF instructs the UE to release the PDU session according to the fourth message;

[0040] Alternatively, the AMF can send a third indication message to the UE, so that the UE can determine the access technology type of the PDU session release based on the third indication message and initiate the operation of releasing the PDU session resources of the access technology type.

[0041] In one embodiment, the fourth message includes fourth indication information, which is used to determine the access technology type of the released PDU session; or, the third indication information is access technology information, or information used to indicate signaling connections, or information used to indicate user plane connections.

[0042] A method for handling session release, the method being applied to a UE, the method comprising:

[0043] Receive the sixth message sent by AMF;

[0044] The access technology type of the released PDU session is determined based on the sixth message;

[0045] Initiate a PDU session release process based on the access technology type.

[0046] In one embodiment, the sixth message includes fifth indication information, which is access technology information, or information indicating a signaling connection, or information indicating a user plane connection. The fifth indication information is either fourth indication information received by the AMF from the SMF, or the fifth indication information is determined by the AMF based on third indication information sent by the SMF.

[0047] A method for handling session release, the method being applied to UPF, the method comprising:

[0048] Establish a connection with the UE through a preset protocol;

[0049] Receive the connection release message from the UE, or initiate a connection release process to the UE;

[0050] Send a seventh message to the SMF to instruct the SMF to initiate a session release procedure.

[0051] In one embodiment, the seventh message includes information for determining the access technology type of the released PDU session, so that the SMF initiates the release of the PDU session of the access technology type.

[0052] A session release processing apparatus, the apparatus comprising:

[0053] The first receiving module is used to receive the first message sent by the user terminal UE;

[0054] The first determining module is used to determine the access technology type of the released multi-access protocol data unit (PDU) session based on the first message.

[0055] The first sending module is used to send a second message to the Session Management Control Network Element (SMF), the second message including information for determining the access technology type of the released PDU session.

[0056] A session release processing apparatus, the apparatus comprising:

[0057] The second receiving module is used to receive the third message sent by the AMF;

[0058] The second determining module is used to determine the access technology type of the released PDU session based on the third message;

[0059] The first release module is used to initiate a PDU session release process based on the access technology type.

[0060] A session release processing apparatus, the apparatus comprising:

[0061] The second sending module sends a first message to the AMF so that the AMF instructs the SMF to determine the access technology type of the released PDU session according to the first message; or, it is used to send a first indication information to the SMF through the AMF so that the SMF instructs the SMF to determine the access technology type of the released PDU session according to the first indication information.

[0062] A session release processing apparatus, the apparatus comprising:

[0063] The third receiving module is used to receive the fourth message sent by SMF;

[0064] The third determining module is used to determine the access technology type of the released PDU session based on the fourth message;

[0065] The third sending module is used to send a fifth message to the UE, the fifth message including information for determining the access technology type of the released PDU session.

[0066] A session release processing apparatus, the apparatus comprising:

[0067] The fourth sending module is used to send a fourth message to the AMF so that the AMF instructs the UE to release the PDU session according to the fourth message; or, it is used to send a third indication information to the UE through the AMF so that the UE determines the access technology type of the PDU session release according to the third indication information and initiates the operation of releasing the PDU session resources of the access technology type.

[0068] A session release processing apparatus, the apparatus comprising:

[0069] The fourth receiving module is used to receive the sixth message sent by the AMF;

[0070] The fourth determining module is used to determine the access technology type of the released PDU session based on the sixth message;

[0071] The second release module is used to initiate a PDU session release process based on the access technology type.

[0072] A session release processing apparatus, the apparatus comprising:

[0073] The connection module is used to establish a connection with the UE through a preset protocol.

[0074] The third release module is used to receive the connection release message from the UE, or to initiate a connection release process to the UE;

[0075] The fifth sending module is used to send a seventh message to the SMF to instruct the SMF to initiate a session release process.

[0076] An access and mobility management device includes: a transmitter, a receiver, and a processor;

[0077] The receiver is used to receive the first message sent by the user terminal UE;

[0078] The processor is configured to determine the access technology type of the released Multi-Access Protocol Data Unit (PDU) session based on the first message;

[0079] The transmitter is configured to send a second message to the Session Management Control Network Element (SMF), the second message including information for determining the access technology type of the released PDU session.

[0080] A session management control device includes: a transceiver and a processor;

[0081] The transceiver is used to receive a third message sent by the AMF;

[0082] The processor is configured to determine the access technology type of the released PDU session based on the third message;

[0083] The processor is also configured to initiate a PDU session release process based on the access technology type.

[0084] A terminal device includes: a transceiver;

[0085] The transceiver is configured to send a first message to the AMF so that the AMF instructs the SMF to determine the access technology type of the released PDU session according to the first message; or, it is configured to send a first indication information to the SMF through the AMF so that the SMF instructs the SMF to determine the access technology type of the released PDU session according to the first indication information.

[0086] An access and mobility management device includes: a transmitter, a receiver, and a processor;

[0087] The receiver is used to receive the fourth message sent by the SMF;

[0088] The processor is configured to determine the access technology type of the released PDU session based on the fourth message;

[0089] The transmitter is configured to send a fifth message to the UE, the fifth message including information for determining the access technology type of the released PDU session.

[0090] A session management and control device includes: a transceiver;

[0091] The transceiver is configured to send a fourth message to the AMF so that the AMF instructs the UE to release the PDU session according to the fourth message; or, it is configured to send a third indication information to the UE through the AMF so that the UE determines the access technology type of the PDU session release according to the third indication information and initiates the operation of releasing the PDU session resources of the access technology type.

[0092] A terminal device includes: a transceiver and a processor;

[0093] The transceiver is used to receive the sixth message sent by the AMF;

[0094] The processor is configured to determine the access technology type of the released PDU session based on the sixth message;

[0095] The processor is also configured to initiate a PDU session release process based on the access technology type.

[0096] A user plane function device includes: a transceiver and a processor;

[0097] The processor is used to establish a connection with the UE through a preset protocol;

[0098] The transceiver is used to receive the connection release message from the UE, or to initiate a connection release process to the UE;

[0099] The transceiver is also used to send a seventh message to the SMF to instruct the SMF to initiate a session release procedure.

[0100] A computer-readable storage medium having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0101] Receive the first message sent by the user terminal (UE);

[0102] Based on the first message, determine the access technology type of the released Multi-Access Protocol Data Unit (PDU) session;

[0103] A second message is sent to the Session Management Control Network Element (SMF), the second message including information for determining the access technology type of the released PDU session.

[0104] A computer-readable storage medium having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0105] Receive the third message sent by AMF;

[0106] The access technology type of the released PDU session is determined based on the third message;

[0107] Initiate a PDU session release process based on the access technology type.

[0108] A computer-readable storage medium having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0109] Send a first message to the AMF so that the AMF can instruct the SMF to determine the access technology type of the released PDU session based on the first message.

[0110] Alternatively, the AMF may send a first indication message to the SMF, so that the SMF can determine the access technology type of the released PDU session based on the first indication message.

[0111] A computer-readable storage medium having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0112] Receive the fourth message sent by SMF;

[0113] Based on the fourth message, determine the access technology type of the released PDU session;

[0114] A fifth message is sent to the UE, the fifth message including information for determining the access technology type of the released PDU session.

[0115] A computer-readable storage medium having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0116] Send a fourth message to the AMF so that the AMF instructs the UE to release the PDU session according to the fourth message;

[0117] Alternatively, the AMF can send a third indication message to the UE, so that the UE can determine the access technology type of the PDU session release based on the third indication message and initiate the operation of releasing the PDU session resources of the access technology type.

[0118] A computer-readable storage medium having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0119] Receive the sixth message sent by AMF;

[0120] The access technology type of the released PDU session is determined based on the sixth message;

[0121] Initiate a PDU session release process based on the access technology type.

[0122] A computer-readable storage medium having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0123] Establish a connection with the UE through a preset protocol;

[0124] Receive the connection release message from the UE, or initiate a connection release process to the UE;

[0125] Send a seventh message to the SMF to instruct the SMF to initiate a session release procedure.

[0126] A computer program product includes a computer program that, when executed by a processor, implements the session release processing method provided in the embodiments of this application. The method may include:

[0127] Receive the first message sent by the user terminal (UE);

[0128] Based on the first message, determine the access technology type of the released Multi-Access Protocol Data Unit (PDU) session;

[0129] A second message is sent to the Session Management Control Network Element (SMF), the second message including information for determining the access technology type of the released PDU session.

[0130] A computer program product includes a computer program that, when executed by a processor, implements the session release processing method provided in the embodiments of this application. The method may include:

[0131] Receive the third message sent by AMF;

[0132] The access technology type of the released PDU session is determined based on the third message;

[0133] Initiate a PDU session release process based on the access technology type.

[0134] A computer program product includes a computer program that, when executed by a processor, implements the session release processing method provided in the embodiments of this application. The method may include:

[0135] Send a first message to the AMF so that the AMF can instruct the SMF to determine the access technology type of the released PDU session based on the first message.

[0136] Alternatively, the AMF may send a first indication message to the SMF, so that the SMF can determine the access technology type of the released PDU session based on the first indication message.

[0137] A computer program product includes a computer program that, when executed by a processor, implements the session release processing method provided in the embodiments of this application. The method may include:

[0138] Receive the fourth message sent by SMF;

[0139] Based on the fourth message, determine the access technology type of the released PDU session;

[0140] A fifth message is sent to the UE, the fifth message including information for determining the access technology type of the released PDU session.

[0141] A computer program product includes a computer program that, when executed by a processor, implements the session release processing method provided in the embodiments of this application. The method may include:

[0142] Send a fourth message to the AMF so that the AMF instructs the UE to release the PDU session according to the fourth message;

[0143] Alternatively, the AMF can send a third indication message to the UE, so that the UE can determine the access technology type of the PDU session release based on the third indication message and initiate the operation of releasing the PDU session resources of the access technology type.

[0144] A computer program product includes a computer program that, when executed by a processor, implements the session release processing method provided in the embodiments of this application. The method may include:

[0145] Receive the sixth message sent by AMF;

[0146] The access technology type of the released PDU session is determined based on the sixth message;

[0147] Initiate a PDU session release process based on the access technology type.

[0148] A computer program product includes a computer program that, when executed by a processor, implements the session release processing method provided in the embodiments of this application. The method may include:

[0149] Establish a connection with the UE through a preset protocol;

[0150] Receive the connection release message from the UE, or initiate a connection release process to the UE;

[0151] Send a seventh message to the SMF to instruct the SMF to initiate a session release procedure.

[0152] The aforementioned session release processing method, apparatus, device, medium, and program products include: the AMF receiving a first message sent by the user terminal UE; determining the access technology type of the released Multi-Access Protocol Data Unit (PDU) session based on the first message; and sending a second message to the Session Management Control (SMF), the second message including information for determining the access technology type of the released PDU session. When the UE initiates PDU session release without utilizing the N3IWF functional device, the information of the released PDU session indicated by the first message is transmitted to the SMF through interaction between the UE, AMF, and SMF, thereby realizing the release process of the user plane connection for the multi-access PDU session. Attached Figure Description

[0153] Figure 1 This is an application environment diagram of a session release processing method in one embodiment;

[0154] Figure 2 This is a diagram illustrating session release in traditional technology.

[0155] Figure 3 This is a flowchart illustrating a session release process in one embodiment;

[0156] Figure 4 This is an interactive diagram illustrating a session release processing method in one embodiment;

[0157] Figure 5 This is a flowchart illustrating the session release process in another embodiment;

[0158] Figure 6 This is an interactive diagram illustrating the session release processing method in another embodiment;

[0159] Figure 7 This is a flowchart illustrating the session release process in another embodiment;

[0160] Figure 8 This is an interactive diagram illustrating the session release processing method in another embodiment;

[0161] Figure 9 This is a flowchart illustrating the session release process in another embodiment;

[0162] Figure 10 This is an interactive diagram illustrating the session release processing method in another embodiment;

[0163] Figure 11 This is a flowchart illustrating the session release process in another embodiment;

[0164] Figure 12 This is an interactive diagram illustrating the session release processing method in another embodiment;

[0165] Figure 13 This is a structural block diagram of a session release processing device in one embodiment;

[0166] Figure 14 A structural block diagram of a session release processing device in another embodiment;

[0167] Figure 15 A structural block diagram of a session release processing device in another embodiment;

[0168] Figure 16 A structural block diagram of a session release processing device in another embodiment;

[0169] Figure 17 A structural block diagram of a session release processing device in another embodiment;

[0170] Figure 18 A structural block diagram of a session release processing device in another embodiment;

[0171] Figure 19 A structural block diagram of a session release processing device in another embodiment;

[0172] Figure 20 This is an internal structure diagram of the access and mobility management device in one embodiment;

[0173] Figure 21 This is an internal structure diagram of the session management control device in one embodiment;

[0174] Figure 22 This is an internal structure diagram of a terminal device in one embodiment;

[0175] Figure 23 This is an internal structure diagram of the access and mobility management device in another embodiment;

[0176] Figure 24 This is an internal structural diagram of the session management control device in another embodiment;

[0177] Figure 25 This is an internal structure diagram of the terminal device in another embodiment;

[0178] Figure 26 This is an internal structural diagram of a user plane function device in one embodiment. Detailed Implementation

[0179] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0180] Figure 1 This is a schematic diagram illustrating an application scenario for session release processing provided in an embodiment of this application. For example... Figure 1 As shown, this scenario includes a User Equipment (UE) 100, an Access and Mobility Management Function (AMF) 200, a Session Management Function (SMF) 300, and a User Plane Function (UPF). Data transmission occurs between UE100 and AMF200 via the network, between AMF200 and SMF300 via the network, and between SMF300 and UPF400 via the network.

[0181] In traditional technologies, such as Figure 2 As shown, multi-connection PDU session services can utilize a 3GPP access network and a non-3GPP access network simultaneously, along with two independent data transmission channels between the PDU session anchor (PSA) and the RAN / AN. After a PDU session is established, if the session establishes user plane transmission channels on both access technologies, the terminal can apply network-provided policies and determine how to allocate uplink traffic between the two access networks based on local conditions. These local conditions may include network interface availability, signal loss conditions, and user preferences. Similarly, the MAPDU session's UPF applies network-provided policies (i.e., N4 rules) and feedback information received from the UE via the user plane to determine how to allocate downlink traffic between the two data transmission channels. This feedback information may include access network unavailability or availability.

[0182] If the N3IWF functional device is removed from the Non-3GPP access, control signaling cannot be executed on the Non-3GPP side. The control signaling process can only be executed on the 3GPP access technology side. That is, the release process of the data transmission channel on the Non-3GPP access side is executed by the control signaling on the 3GPP access side.

[0183] Based on the above-mentioned traditional technology, the embodiments of this application provide a session release processing method, which releases the session through the interaction between the UE, AMF, SMF and UPF.

[0184] It should be noted that the beneficial effects or technical problems solved by the embodiments of this application are not limited to this one, but may also be other implicit or related problems. For details, please refer to the description of the embodiments below.

[0185] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0186] In one embodiment, such as Figure 3 As shown, a method for handling session release is provided, which is applied to... Figure 1 Taking the AMF device in the example, the following steps are included:

[0187] S201, Receive the first message sent by the user terminal UE.

[0188] In this embodiment, the UE triggers PDU session release, and the first message is a PDU session release request. The UE generates the first message according to the release requirement of the PDU session and sends the first message to the AMF. Optionally, the UE can send the first message to the AMF when it receives a session release indication, or the UE can send the first message to the AMF at a preset time.

[0189] Optionally, the first message includes first indication information; the first indication information is access technology information, or information used to indicate a signaling connection, or information used to indicate a user plane connection. For example, the first indication information may be access technology information, or, when 3GPP and Non-3GPP access technologies have signaling planes and user planes respectively, the first indication information may indicate either the user plane or the signaling plane.

[0190] S202, Based on the first message, determine the access technology type of the released Multi-Access Protocol Data Unit (PDU) session.

[0191] In this embodiment of the application, the AMF parses the first message to obtain the access technology type of the PDU session. Optionally, a correspondence between access technology information and access technology type can be established in advance, so as to determine the access technology type of the PDU session corresponding to the first message based on the access technology information in the first message and the correspondence.

[0192] S203, a second message is sent to the Session Management Control Network Element (SMF), the second message including information for determining the access technology type of the released PDU session.

[0193] The second message is the Nsmf_PDUSession_UpdateSMContext message, which is a signaling message for updating the SMF context.

[0194] In this embodiment, the AMF generates a second message based on the access technology type of the released PDU session and sends the second message to the SMF, thereby enabling the SMF to interact with other network elements based on the access technology type in the second message and release the PDU session. Optionally, the second message may also include the UE's N1 SM container, etc., received by the AMF.

[0195] In the above-described session release processing method, a first message is received from the user terminal (UE); based on the first message, the access technology type of the released multi-access protocol data unit (PDU) session is determined; a second message is sent to the session management control network element (SMF), the second message including information used to determine the access technology type of the released PDU session. When the UE initiates PDU session release and does not utilize the N3IWF functional device, the information of the released PDU session indicated by the first message is transmitted to the SMF through interaction between the UE, AMF, and SMF, thereby realizing the release process of the user plane connection for the multi-access PDU session.

[0196] In one embodiment, the above-mentioned S202 "determining the access technology type of the released multi-access protocol data unit (PDU) session according to the first message" may include: determining the access technology type of the released PDU session according to the first indication information.

[0197] In this embodiment of the application, a correspondence between access technology information and access technology type can be established in advance, so as to determine the access technology type of the PDU session corresponding to the first indication information based on the access technology information represented by the first indication information and the correspondence.

[0198] Optionally, in this embodiment, the PSA is a User Plane Function (UPF) that exchanges PDUs between the terminal and the data network. The multi-connection PDU connection service is implemented by establishing a multi-access PDU session, meaning one PDU session can have user plane resources on two access networks. The interaction between the UE, AMF, SMF, and UPF can be as follows: Figure 4 As shown, RAN stands for Radio Access Network. The UE sends a PDU Session Release Request message to the AMF. Based on the received indication information, the AMF determines the access technology type of the released PDU session, causing the AMF to send an Nsmf_PDUSession_UpdateSMContext message containing the access technology type of the released PDU session to the SMF. The SMF then sends an N4 Session Release Request message to the UPF. Further, the UPF sends an N4 Session Release Response message to the SMF, or an N4 Session Modification Response message to the SMF, to release the PDU session. Further, the SMF sends an Nsmf_PDUSession_UpdateSMContext Request message to the AMF. Finally, the AMF sends a PDU Session release command message to the UE. It should be noted that if this session release process is used to release Non-3GPP user plane resources, and the control plane on the Non-3GPP access side is executed on the 3GPP access side, then the Nsmf_PDUSession_UpdateSMContext Request message does not contain N2 session management information. Among them, the N4Session Release Request message is a key signaling message in the 5G core network used to request the release of user plane resources related to the PDU session, and the N4 Session Modification Response message is a key signaling message in the 5G core network used to respond to session modification requests.

[0199] In the above application embodiments, when the first message includes first indication information, the access technology type of the released PDU session is determined according to the first indication information, thereby improving the accuracy of the determined access technology type.

[0200] In one embodiment, the above-mentioned S201 "receiving the first message sent by the UE" may include: receiving a PDU session release request message sent by the UE; or, receiving a PDU session modification request message sent by the UE.

[0201] In this embodiment, the first message can be a PDU session release request message or a PDU session modification request message. When the first message is a PDU session release request message, the AMF interacts with other network elements according to the first message to release the PDU session. When the first message is a PDU session modification request message, the AMF interacts with other network elements according to the first message to modify the PDU session without releasing the PDU session.

[0202] In the above application embodiments, the UE can initiate a PDU session modification request or a PDU session release request, thereby flexibly managing the PDU session.

[0203] In one embodiment, such as Figure 5 As shown, a method for handling session release is provided, which is applied to... Figure 1 Taking SMF as an example, the explanation includes the following steps:

[0204] S301 receives the third message sent by AMF.

[0205] In this embodiment, the UE triggers PDU session release. After the AMF receives the first message sent by the UE, the AMF generates a third message based on the first message and sends the third message to the SMF. Optionally, the third message is an Nsmf_PDUSession_UpdateSMContext message.

[0206] Optionally, in this embodiment, the third message includes second indication information, which is access technology information, or information indicating a signaling connection, or information indicating a user plane connection; the second indication information is first indication information sent by the UE and received by the AMF, or the second indication information is determined by the AMF based on the first indication information sent by the UE. For example, the second indication information can be access technology information, or, when 3GPP and Non-3GPP access technologies have signaling plane and user plane respectively, the first indication information can represent either the user plane or the signaling plane.

[0207] Optionally, if the third message does not include indication information, the SMF determines to release the user plane transport channel of the PDU session on the 3GPP and Non-3GPP access sides.

[0208] S302, determine the access technology type of the released PDU session based on the third message.

[0209] In this embodiment of the application, the SMF parses the third message to obtain the access technology type of the PDU session. Optionally, a correspondence between access technology information and access technology type can be established in advance, so as to determine the access technology type of the PDU session corresponding to the third message based on the access technology information in the third message and the correspondence.

[0210] S303, initiate the PDU session release process based on the access technology type.

[0211] In this embodiment, the SMF interacts with the UPF according to the access technology type to release the PDU session.

[0212] Optionally, in the embodiments of this application, the interaction between the UE, AMF, SMF, and UPF can be as follows: Figure 6 As shown, the UE sends a PDU Session Release Request message to the AMF, and the AMF sends an Nsmf_PDUSession_UpdateSMContext message to the SMF. The SMF determines the access technology type of the released PDU session based on this message. Further, the SMF sends an N4 Session Release Request message to the UPF, and in response to this message, the UPF sends an N4 SessionRelease Response message to the SMF. Further, the SMF sends an Nsmf_PDUSession_UpdateSMContextRequest message to the AMF. The Nsmf_PDUSession_UpdateSMContext Request message is a signaling message used in the 5G core network to request an update to the SMF context. If the process of releasing the session is used to release Non-3GPP user plane resources, and the control plane of the Non-3GPP access side is executed on the 3GPP access side, then this message does not contain N2 session management information.

[0213] Optionally, if the released PDU session is a single access technology type PDU session, the SMF sends an N4Session Modification message to the UPF, and in response to this message, the UPF sends an N4 Session ModificationResponse message to the SMF. The N4 Session Modification message and the N4 Session ModificationResponse message are key signaling messages in the 5G core network used to request an update to the SMF context.

[0214] In the above-mentioned session release processing method, a third message sent by the AMF is received; the access technology type of the released PDU session is determined according to the third message; and the PDU session release process is initiated according to the access technology type. When the UE initiates the PDU session release, the information of the released PDU session indicated by the first message is transmitted to the SMF through the interaction between the UE, AMF, and SMF, thereby realizing the release process of user plane connection for PDU sessions with multiple access.

[0215] In one embodiment, an implementation of the above-described S302 is provided, wherein the above-described "determining the access technology type of the released PDU session according to the third message" may include: determining the access technology type of the released PDU session according to the second indication information.

[0216] In this embodiment of the application, a correspondence between access technology information and access technology type can be established in advance, so as to determine the access technology type of the PDU session corresponding to the second indication information based on the access technology information represented by the second indication information and the correspondence.

[0217] In the above application embodiments, when the third message includes the second indication information, the access technology type of the released PDU session is determined according to the second indication information, thereby improving the accuracy of the determined access technology type.

[0218] In one embodiment, a session release processing method is provided, which is applied to... Figure 1 Taking the UE as an example, the process includes the following steps: sending a first message to the AMF so that the AMF can instruct the SMF to determine the access technology type of the released PDU session according to the first message; or, sending a first indication information to the SMF through the AMF so that the SMF can determine the access technology type of the released PDU session according to the first indication information.

[0219] In this embodiment of the application, the UE triggers the release of the PDU session. The UE sends a first message to the AMF so that the AMF can instruct the SMF to determine the access technology type of the released PDU session according to the first message. When the AMF determines the access technology type of the released PDU session according to the first message, it sends a second message to the SMF. The second message contains information for determining the access technology type.

[0220] Optionally, in this embodiment of the application, the first message includes first indication information, which is used to determine the access technology type of the released PDU session; the first indication information is access technology information, or information used to indicate signaling connection, or information used to indicate user plane connection.

[0221] Alternatively, in this embodiment, the UE sends a first message to the AMF, the first message including first indication information. The AMF generates a third message based on the first indication information and sends the third message to the SMF. The SMF determines the access technology type of the released PDU session based on the second indication information in the third message. Optionally, the second indication information is access technology information, or information used to indicate signaling connections, or information used to indicate user plane connections; the second indication information is the first indication information sent by the UE and received by the AMF, or the second indication information is determined by the AMF based on the first indication information sent by the UE.

[0222] In the above-described session release processing method, a first message is sent to the AMF so that the AMF instructs the SMF to determine the access technology type of the released PDU session; or, the AMF sends a first indication message to the SMF so that the SMF instructs the SMF to determine the access technology type of the released PDU session. Without going through the Non-3GPP control plane, the user plane connection release process for multi-access PDU sessions is achieved through interaction between the UE, AMF, and SMF.

[0223] In one embodiment, such as Figure 7 As shown, a method for handling session release is provided, which is applied to... Figure 1 Taking AMF as an example, the explanation includes the following steps:

[0224] S401, receive the fourth message sent by SMF.

[0225] The fourth message is the Namf_Communication_N1N2Messagetransfer message. Namf_Communication_N1N2MessageTransfer is used to transmit messages of the N1 and N2 interfaces between the SMF and AMF. It is usually used to transmit non-access stratum (NAS) signaling messages.

[0226] In this embodiment, the SMF triggers the release of the PDU session. The SMF first interacts with the UPF to release the N4 session. Further, the SMF sends a fourth message to the AMF. Optionally, the interaction between the SMF and the UPF to release the N4 session includes: the SMF sending an N4 Session Release Request message to the UPF, and the UPF sending an N4 Session Release Response message to the SMF; or, the SMF sending an N4 Session Modification message to the UPF, and the UPF sending an N4 Session Modification Response message to the SMF.

[0227] Optionally, in this embodiment, the fourth message includes fourth indication information; the fourth indication information is access technology information, or information used to indicate signaling connections, or information used to indicate user plane connections. For example, the fourth indication information can be access technology information, or, when 3GPP and Non-3GPP access technologies have signaling planes and user planes respectively, the first indication information can be information indicating the user plane or signaling plane. It should be noted that if the SMF determines to release the user plane transmission channels on the 3GPP and Non-3GPP access sides of the PDU session, the fourth message does not include the fourth indication information.

[0228] S402, based on the fourth message, determine the access technology type of the released PDU session.

[0229] In this embodiment of the application, the AMF parses the fourth message to obtain the access technology type of the PDU session. Optionally, a correspondence between access technology information and access technology type can be established in advance, so as to determine the access technology type of the PDU session corresponding to the fourth message based on the access technology information in the fourth message and the correspondence.

[0230] S403, a fifth message is sent to the UE, which includes information for determining the access technology type of the released PDU session.

[0231] In this embodiment, the fifth message is a NAS message. The AMF sends the fifth message to the UE to send a PDU session release command. Specifically, the AMF generates the fifth message based on the access technology type of the released PDU session and sends the fifth message to the UE, thereby enabling the UE to interact with other network elements according to the access technology type in the fifth message and release the PDU session.

[0232] Optionally, in this embodiment, the fifth message includes third indication information to instruct the UE to determine the access technology type of the released PDU session based on the third indication information.

[0233] In the above-described session release process, a fourth message is received from the SMF; the access technology type of the released PDU session is determined based on the fourth message; and a fifth message is sent to the UE, the fifth message including information used to determine the access technology type of the released PDU session. When the SMF initiates PDU session release and does not utilize the control plane of the Non-3GPP access side, the information on the access technology type of the released PDU session indicated by the fourth message sent by the SMF is transmitted to the UE through interaction between the UE, AMF, and SMF, thereby realizing the release process of user plane connections for multi-access PDU sessions.

[0234] In one embodiment, the above-mentioned S402 "determine the access technology type of the released PDU session according to the fourth message" may include: determining the access technology type of the released PDU session according to the fourth indication information.

[0235] In this embodiment of the application, a correspondence between access technology information and access technology type can be established in advance, so as to determine the access technology type of the PDU session corresponding to the fourth indication information based on the access technology information represented by the fourth indication information and the correspondence.

[0236] Optionally, the interaction between UE, AMF, SMF, and UPF can be as follows: Figure 8 As shown, the SMF triggers PDU session release, and the SMF sends an N4 Session Release Request message to the UPF. In response to this message, the UPF sends an N4 SessionRelease Response message to the SMF. The SMF sends a Namf_Communication_N1N2Messagetransfer message to the AMF, which includes fourth indication information so that the AMF can determine third indication information based on the fourth indication information. Further, the AMF sends a NAS message including the third indication information to the UE, so that the UE can delete the PDU session information of the access technology determined according to the third indication information.

[0237] In the above application embodiments, when the fourth message includes fourth indication information, the access technology type of the released PDU session is determined according to the fourth indication information, thereby improving the accuracy of the determined access technology type.

[0238] In one embodiment, the above-mentioned S401 "receiving a fourth message sent by SMF" may include: receiving a PDU session release request message sent by SMF; or receiving a PDU session modification request message sent by SMF.

[0239] In this embodiment, the fourth message can be a PDU session release request message or a PDU session modification request message. When the fourth message is a PDU session release request message, the AMF interacts with other network elements according to the fourth message to release the PDU session. When the fourth message is a PDU session modification request message, the AMF interacts with other network elements according to the first message to modify the PDU session without releasing the PDU session.

[0240] In the above application embodiments, the SMF can initiate a PDU session modification request or a PDU session release request, thereby flexibly managing the PDU session.

[0241] In one embodiment, a session release processing method is provided, which is applied to... Figure 1 Taking the SMF as an example, the process includes the following steps: sending a fourth message to the AMF so that the AMF instructs the UE to release the PDU session according to the fourth message; or, sending a third indication message to the UE through the AMF so that the UE determines the access technology type of the PDU session release according to the third indication message and initiates the operation of releasing the PDU session resources of the access technology type.

[0242] In this embodiment of the application, the SMF triggers the release of the PDU session. The SMF sends a fourth message to the AMF so that when the AMF instructs the UE to determine the access technology type of the released PDU session according to the fourth message, the AMF determines the access technology type of the released PDU session according to the fourth message and sends a fifth message to the UE according to the access technology type of the released PDU session.

[0243] Optionally, in this embodiment, the fourth message includes fourth indication information, which is used to determine the access technology type of the released PDU session; the fourth indication information is access technology information, or information used to indicate signaling connection, or information used to indicate user plane connection.

[0244] Alternatively, in this embodiment, the SMF sends a fourth message to the AMF, the fourth message including fourth indication information. The AMF generates a sixth message based on the fourth indication information and sends the sixth message to the UE. The UE determines the access technology type of the released PDU session based on the fifth indication information in the sixth message. Optionally, the fifth indication information is access technology information, or information used to indicate signaling connections, or information used to indicate user plane connections; the fifth indication information is the fourth indication information received by the AMF from the SMF, or the fifth indication information is determined by the AMF based on the fourth indication information sent by the SMF.

[0245] In the above-described session release processing method, a fourth message is sent to the AMF so that the AMF instructs the UE to release the PDU session according to the fourth message; or, the AMF sends a third indication message to the UE so that the UE determines the access technology type of the PDU session release according to the third indication message and initiates the operation of releasing the PDU session resources of the access technology type. When the SMF initiates the PDU session release and does not utilize the N3IWF functional device, the information of the released PDU session indicated by the fourth message sent by the SMF is transmitted to the UE through the interaction between the UE, AMF, and SMF, realizing the release process of user plane connection for PDU sessions with multiple access.

[0246] In one embodiment, such as Figure 9 As shown, a method for handling session release is provided, which is applied to... Figure 1 Taking the UE as an example, the following steps are included:

[0247] S501 receives the sixth message sent by AMF.

[0248] In this embodiment, the SMF triggers PDU session release. After the AMF receives the fourth message sent by the SMF, the AMF generates a sixth message based on the fourth message and sends the sixth message to the UE. Optionally, the third message is a NAS message, which includes N1 session management container or protocol configuration option information.

[0249] Optionally, in the embodiments of this application, the sixth message includes fifth indication information, which is access technology information, or information used to indicate signaling connection, or information used to indicate user plane connection. The fifth indication information is the fourth indication information sent by the SMF and received by the AMF, or the fifth indication information is determined by the AMF based on the third indication information sent by the SMF.

[0250] Optionally, if the NAS message does not contain any indication information, the UE determines to release the 3GPP and Non-3GPP user planes of the PDU session.

[0251] S502, determine the access technology type of the released PDU session according to the sixth message.

[0252] In this embodiment of the application, the UE parses the sixth message to obtain the access technology type of the PDU session. Optionally, a correspondence between access technology information and access technology type can be established in advance, so as to determine the access technology type of the PDU session corresponding to the sixth message based on the access technology information in the sixth message and the correspondence.

[0253] S503, initiates the PDU session release process based on the access technology type.

[0254] In this embodiment, the UE releases the PDU session based on the access technology type. Optionally, the interaction between the UE, AMF, SMF, and UPF can be as follows: Figure 10 As shown, the SMF triggers PDU session release and sends an N4 Session ReleaseRequest message to the UPF. The UPF sends an N4 Session Release Response message to the SMF to release the N4 message. Further, the SMF sends a Namf_Communication_N1N2Messagetransfer message to the AMF, and the AMF sends a NAS message to the UE to send a PDU session release command to the UE, so that the UE can delete the PDU session information of the access technology determined according to the second indication information.

[0255] In the above application embodiments, a sixth message sent by the AMF is received; the access technology type of the released PDU session is determined according to the sixth message; and the PDU session release process is initiated according to the access technology type. When the SMF initiates the PDU session release and does not utilize the N3IWF functional device, the information of the released PDU session indicated by the fourth message sent by the SMF is transmitted to the UE through interaction between the UE, AMF, and SMF, thereby realizing the release process of the user plane connection for a multi-access PDU session.

[0256] In one embodiment, such as Figure 11 As shown, a method for handling session release is provided, which is applied to... Figure 1 Taking UPF as an example, the explanation includes the following steps:

[0257] S601 establishes a connection with the UE through a preset protocol.

[0258] The preset protocols can be Multipath Quick UDP Internet Connection (MPQUIC), Internet Protocol Security (IPSec), etc. MPQUIC is a multipath transmission technology based on the QUIC protocol, which allows multiple network paths to be used simultaneously on a single QUIC connection to improve the reliability and efficiency of data transmission. IPSec is a protocol packet that protects the IP protocol's Internet Protocol Security by encrypting and authenticating IP protocol packets, and can implement security functions such as data confidentiality, data integrity, data authentication, and anti-replay.

[0259] In this embodiment, the UE and UPF can establish a connection through protocols such as MPQUIC and IPSec, thereby enabling the UE or UPF to initiate connection release through protocol layers such as MPQUIC and IPSec, thus releasing the user plane connection.

[0260] S602, receive the connection release message from the UE, or initiate a connection release procedure to the UE.

[0261] In this embodiment of the application, the UPF receives a message from the UE to release the PDU session, or the UPF sends a message to the UE to release the PDU session.

[0262] Optionally, the PDU or UE may send a connection release message according to a preset release logic, or the PDU or UE may send a connection release message at a preset time.

[0263] S603, send the seventh message to the SMF to instruct the SMF to initiate a session release procedure.

[0264] Optionally, in this embodiment, the seventh message includes information for determining the access technology type of the released PDU session, so that the SMF initiates the release of the PDU session of the access technology type. The seventh message can also be used to notify the UE of the release of the user plane connection on the Non-3GPP access side of the released PDU session.

[0265] As an optional implementation, the seventh message can be an N4 Session Report message, which includes a connection release notification, such as a connection release or a User plane release. Optionally, the message may also include a connection identifier between the UE and the UPF, or access technology type information, to facilitate identification of the released connection or user plane information.

[0266] As an alternative implementation, the seventh message can be a Connection release message, which may include a connection identifier between the UE and the UPF, or access technology type information, in order to identify the released connection or user plane information.

[0267] In the embodiments of this application, such as Figure 12As shown, the PDU sends a seventh message to the SMF. The SMF can then generate an eighth message based on the seventh message and send it to the AMF. Optionally, the eighth message can be a Namf_Communication_N1N2MessageTransfer message, or it can be an Nsmf_PDUSession_UpdateSMContext message, etc. The eighth message may include indication information, which is used to notify the UE of a Non-3GPP access side user plane connection release confirmation or a Non-3GPP access side user plane connection release command. The user plane connection release command is represented as a PDU Session Release Command. Specifically, the N1 session management container may include PDU Session ReleaseCommand or PDU Session Release Ack information. Further, the AMF sends a NAS message to the UE, which includes the indication information received from the SMF, thereby completing the PDU session release process.

[0268] In the above-described session release process, a connection is established with the UE through a preset protocol; a connection release message is received from the UE, or a connection release procedure is initiated for the UE; a seventh message is sent to the SMF to instruct the SMF to initiate a session release procedure. Without utilizing the N3IWF functional device, the user plane connection release procedure for multi-access PDU sessions is achieved through interaction between the UE, AMF, and SMF.

[0269] It should be understood that, although Figure 2-12 The steps in the flowchart are shown sequentially as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order in which these steps are executed, and they can be performed in other orders. Figure 2-12 At least some of the steps in the process may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but may be executed at different times. The execution order of these steps or stages is not necessarily sequential, but may be executed in turn or alternately with other steps or at least some of the steps or stages in other steps.

[0270] In one embodiment, such as Figure 13 As shown, a session release processing apparatus is provided, comprising: a first receiving module 10, a first determining module 11, and a first sending module 12, wherein:

[0271] The first receiving module 10 is used to receive a first message sent by the user terminal UE; the first message includes first indication information; the first indication information is access technology information, or information used to indicate signaling connection, or information used to indicate user plane connection.

[0272] The first determining module 11 is used to determine the access technology type of the released multi-access protocol data unit (PDU) session based on the first message.

[0273] The first sending module 12 is used to send a second message to the Session Management Control Network Element (SMF), the second message including information for determining the access technology type of the released PDU session.

[0274] In one embodiment, the first determining module 11 includes: a first determining unit, configured to determine the access technology type of the released PDU session based on the first indication information.

[0275] In one embodiment, the first receiving module 10 includes: a first receiving unit, configured to receive a PDU session release request message sent by the UE; or, to receive a PDU session modification request message sent by the UE.

[0276] In one embodiment, such as Figure 14 As shown, a session release processing apparatus is provided, comprising: a second receiving module 13, a second determining module 14, and a first release module 15, wherein:

[0277] The second receiving module 13 is used to receive a third message sent by the AMF; the third message includes second indication information, which is access technology information, or information used to indicate signaling connection, or information used to indicate user plane connection; the second indication information is a first indication information sent by the UE received by the AMF, or the second indication information is determined by the AMF based on the first indication information sent by the UE.

[0278] The second determining module 14 is used to determine the access technology type of the released PDU session based on the third message.

[0279] The first release module 15 is used to initiate a PDU session release process based on the access technology type.

[0280] In one embodiment, the second determining module 14 includes: a second determining unit, configured to determine the access technology type of the released PDU session based on the second indication information.

[0281] In one embodiment, such as Figure 15As shown, a session release processing apparatus is provided, comprising: a second sending module 16, which sends a first message to an AMF so that the AMF instructs the SMF to determine the access technology type of the released PDU session according to the first message; or, it is used to send first indication information to the SMF through the AMF so that the SMF instructs the SMF to determine the access technology type of the released PDU session according to the first indication information; the first message includes first indication information, which is used to determine the access technology type of the released PDU session; the first indication information is access technology information, or information used to indicate signaling connection, or information used to indicate user plane connection.

[0282] In one embodiment, such as Figure 16 As shown, a session release processing apparatus is provided, comprising: a third receiving module 17, a third determining module 18, and a third sending module 19, wherein:

[0283] The third receiving module 17 is used to receive a fourth message sent by the SMF; the fourth message includes fourth indication information; the fourth indication information is access technology information, or information used to indicate signaling connection, or information used to indicate user plane connection.

[0284] The third determining module 18 is used to determine the access technology type of the released PDU session based on the fourth message.

[0285] The third sending module 19 is used to send a fifth message to the UE. The fifth message includes information for determining the access technology type of the released PDU session. The fifth message includes third indication information to instruct the UE to determine the access technology type of the released PDU session according to the third indication information.

[0286] In one embodiment, the second determining module 18 includes a third determining unit, configured to determine the access technology type of the released PDU session based on fourth indication information.

[0287] In one embodiment, the third receiving module includes: a second receiving unit, configured to receive a PDU session release request message sent by the SMF; or, to receive a PDU session modification request message sent by the SMF.

[0288] In one embodiment, such as Figure 17As shown, a session release processing apparatus is provided, including: a fourth sending module 20, configured to send a fourth message to an AMF (Access Technology Provider), so that the AMF instructs the UE to release a PDU session according to the fourth message; the fourth message includes fourth indication information, which is used to determine the access technology type of the released PDU session; or, configured to send third indication information to the UE through the AMF, so that the UE determines the access technology type of the PDU session release according to the third indication information and initiates an operation to release the PDU session resources of the access technology type; the third indication information is access technology information, or information used to indicate signaling connections, or information used to indicate user plane connections.

[0289] In one embodiment, such as Figure 18 As shown, a session release processing apparatus is provided, comprising: a fourth receiving module 21, a fourth determining module 22, and a second release module 23, wherein:

[0290] The fourth receiving module 21 is used to receive the sixth message sent by the AMF; the sixth message includes fifth indication information, which is access technology information, or information used to indicate signaling connection, or information used to indicate user plane connection. The fifth indication information is the fourth indication information sent by the SMF received by the AMF, or the fifth indication information is determined by the AMF based on the third indication information sent by the SMF.

[0291] The third determining module 22 is used to determine the access technology type of the released PDU session based on the sixth message.

[0292] The second release module 23 is used to initiate a PDU session release process based on the access technology type.

[0293] In one embodiment, such as Figure 19 As shown, a session release processing device is provided, comprising: a connection module 24, a third release module 25, and a fifth sending module 26, wherein:

[0294] The connection module 24 is used to establish a connection with the UE through a preset protocol.

[0295] The third release module 25 is used to receive the connection release message from the UE, or to initiate a connection release process to the UE.

[0296] The fifth sending module 26 is used to send a seventh message to the SMF to instruct the SMF to initiate a session release process.

[0297] For specific limitations regarding the session release device, please refer to the limitations on the session release method above, which will not be repeated here. Each module in the aforementioned session release device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in hardware or independently of the processor in the computer device, or stored in software in the memory of the computer device, so that the processor can call and execute the operations corresponding to each module.

[0298] Figure 20 This is a schematic diagram of the structure of an access and mobility management device provided in one embodiment. The access and mobility management device may include a receiver 31, a memory 32, a processor 33, at least one communication bus 34, and a transmitter 35. The communication bus 34 is used to implement communication connections between components. The memory 32 may include high-speed RAM memory, and may also include non-volatile memory (NVM), such as at least one disk storage device. The memory 32 can store various programs for performing various processing functions and implementing the method steps of this embodiment. In this embodiment, the transmitter 35 can be a radio frequency processing module or a baseband processing module in the mobility management device, and the receiver 31 can also be a radio frequency processing module or a baseband processing module in the access and mobility management device. The transmitter 35 and receiver 31 can be integrated together to form a transceiver. Both the transmitter 35 and receiver 31 can be coupled to the processor 33, and can perform receiving or transmitting actions under the instruction or control of the processor 33.

[0299] In this embodiment, receiver 31 is used to receive a first message sent by user terminal UE; the first message includes first indication information; the first indication information is access technology information, or information used to indicate signaling connection, or information used to indicate user plane connection;

[0300] Processor 33 is configured to determine the access technology type of the released Multiple Access Protocol Data Unit (PDU) session based on the first message;

[0301] The transmitter 35 is used to send a second message to the Session Management Control Network Element (SMF), the second message including information for determining the access technology type of the released PDU session.

[0302] In one embodiment, the processor 35 is specifically configured to determine the access technology type of the released PDU session based on the first indication information.

[0303] In one embodiment, receiver 31 is specifically configured to receive a PDU session release request message sent by the UE; or, to receive a PDU session modification request message sent by the UE.

[0304] Figure 21This is a schematic diagram of the structure of a session management control device provided in one embodiment. The session management control device may include a transceiver 41, a memory 42, a processor 43, and at least one communication bus 44. The communication bus 44 is used to implement communication connections between components. The memory 42 may include high-speed RAM, and may also include non-volatile memory (NVM), such as at least one disk storage device. The memory 42 can store various programs for performing various processing functions and implementing the method steps of this embodiment. In this embodiment, the transceiver 41 may be a radio frequency processing module or a baseband processing module in the session management control device.

[0305] In this embodiment, transceiver 41 is used to receive a third message sent by AMF; the third message includes second indication information, which is access technology information, or information used to indicate signaling connection, or information used to indicate user plane connection; the second indication information is either first indication information sent by UE received by AMF, or the second indication information is determined by AMF based on the first indication information sent by UE;

[0306] Processor 43 is used to determine the access technology type of the released PDU session based on the third message;

[0307] The processor 43 is also used to initiate a PDU session release process based on the access technology type.

[0308] In one embodiment, the processor 43 is specifically configured to determine the access technology type of the released PDU session based on the second indication information.

[0309] Figure 22 This is a schematic diagram of the structure of a terminal device provided in one embodiment. The terminal device may include a transceiver 51, a memory 52, a processor 53, and at least one communication bus 54. The communication bus 54 is used to implement communication connections between components. The memory 52 may include high-speed RAM, and may also include non-volatile memory (NVM), such as at least one disk storage device. The memory 52 can store various programs for performing various processing functions and implementing the method steps of this embodiment. In this embodiment, the transceiver 51 may be a radio frequency processing module or a baseband processing module in the terminal device.

[0310] In this embodiment, transceiver 51 is configured to send a first message to the AMF so that the AMF instructs the SMF to determine the access technology type of the released PDU session according to the first message; or, it is configured to send first indication information to the SMF through the AMF so that the SMF instructs the SMF to determine the access technology type of the released PDU session according to the first indication information; the first message includes first indication information, which is used to determine the access technology type of the released PDU session; the first indication information is access technology information, or information used to indicate signaling connection, or information used to indicate user plane connection.

[0311] Figure 23 This is a schematic diagram of the structure of an access and mobility management device provided in one embodiment. The access and mobility management device may include a receiver 61, a memory 62, a processor 63, at least one communication bus 64, and a transmitter 65. The communication bus 64 is used to implement communication connections between components. The memory 62 may include high-speed RAM memory, and may also include non-volatile memory (NVM), such as at least one disk storage device. The memory 62 can store various programs for performing various processing functions and implementing the method steps of this embodiment. In this embodiment, the transmitter 65 can be a radio frequency processing module or a baseband processing module in the mobility management device, and the receiver 61 can also be a radio frequency processing module or a baseband processing module in the access and mobility management device. The transmitter 65 and receiver 61 can be integrated together to form a transceiver. Both the transmitter 65 and receiver 61 can be coupled to the processor 63, and can perform receiving or transmitting actions under the instruction or control of the processor 63.

[0312] In this embodiment, receiver 61 is used to receive a fourth message sent by SMF; the fourth message includes fourth indication information; the fourth indication information is access technology information, or information used to indicate signaling connection, or information used to indicate user plane connection.

[0313] Processor 63 is used to determine the access technology type of the released PDU session based on the fourth message;

[0314] The transmitter 65 is used to send a fifth message to the UE, the fifth message including information for determining the access technology type of the released PDU session; the fifth message includes third indication information to instruct the UE to determine the access technology type of the released PDU session according to the third indication information.

[0315] In one embodiment, the processor 63 is specifically configured to determine the access technology type of the released PDU session based on the fourth indication information.

[0316] In one embodiment, receiver 61 is specifically configured to receive a PDU session release request message sent by SMF; or, to receive a PDU session modification request message sent by SMF.

[0317] Figure 24 This is a schematic diagram of a session management control device provided in one embodiment. The session management control device may include a transceiver 71, a memory 72, a processor 73, and at least one communication bus 74. The communication bus 74 is used to implement communication connections between components. The memory 72 may include high-speed RAM, and may also include non-volatile memory (NVM), such as at least one disk storage device. The memory 72 can store various programs for performing various processing functions and implementing the method steps of this embodiment. In this embodiment, the transceiver 71 may be a radio frequency processing module or a baseband processing module in the session management control device.

[0318] In this embodiment, transceiver 71 is used to send a fourth message to the AMF so that the AMF instructs the UE to release the PDU session according to the fourth message; the fourth message includes fourth indication information, which is used to determine the access technology type of the released PDU session; or, it is used to send third indication information to the UE through the AMF so that the UE determines the access technology type of the released PDU session according to the third indication information and initiates the operation of releasing the PDU session resources of the access technology type; the third indication information is access technology information, or information used to indicate signaling connection, or information used to indicate user plane connection.

[0319] Figure 25 This is a schematic diagram of the structure of a terminal device provided in one embodiment. The terminal device may include a transceiver 81, a memory 82, a processor 83, and at least one communication bus 84. The communication bus 84 is used to implement communication connections between components. The memory 82 may include high-speed RAM, and may also include non-volatile memory (NVM), such as at least one disk storage device. The memory 82 can store various programs for performing various processing functions and implementing the method steps of this embodiment. In this embodiment, the transceiver 81 may be a radio frequency processing module or a baseband processing module in the terminal device.

[0320] In this embodiment, transceiver 81 is used to receive a sixth message sent by AMF; the sixth message includes fifth indication information, which is access technology information, or information used to indicate signaling connection, or information used to indicate user plane connection. The fifth indication information is the fourth indication information sent by SMF received by AMF, or the fifth indication information is determined by AMF based on the third indication information sent by SMF.

[0321] Processor 83 is used to determine the access technology type of the released PDU session based on the sixth message;

[0322] The processor 83 is also used to initiate a PDU session release process based on the access technology type.

[0323] Figure 26 This is a schematic diagram of a user plane functional device provided in one embodiment. The user plane functional device may include a transceiver 91, a memory 92, a processor 93, and at least one communication bus 94. The communication bus 94 is used to implement communication connections between components. The memory 92 may include high-speed RAM memory, and may also include non-volatile memory (NVM), such as at least one disk storage device. The memory 92 can store various programs for performing various processing functions and implementing the method steps of this embodiment. In this embodiment, the transceiver 91 may be a radio frequency processing module or a baseband processing module in the user plane functional device.

[0324] In this embodiment, the processor 93 is used to establish a connection with the UE through a preset protocol;

[0325] Transceiver 91 is used to receive connection release messages from the UE or to initiate a connection release process to the UE;

[0326] Transceiver 91 is also used to send a seventh message to the SMF to instruct the SMF to initiate a session release procedure; the seventh message includes information for determining the access technology type of the released PDU session so that the SMF can initiate the release of the PDU session of the access technology type.

[0327] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0328] Receive a first message sent by a user terminal (UE); the first message includes first indication information; the first indication information is access technology information, or information used to indicate a signaling connection, or information used to indicate a user plane connection;

[0329] Based on the first message, determine the access technology type of the released Multi-Access Protocol Data Unit (PDU) session;

[0330] A second message is sent to the Session Management Control (SMF) element, which includes information for determining the access technology type of the released PDU session.

[0331] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0332] The access technology type of the released PDU session is determined based on the first instruction information.

[0333] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0334] Receive the PDU session release request message sent by the UE;

[0335] Alternatively, receive a PDU session modification request message sent by the UE.

[0336] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0337] The system receives a third message sent by the AMF; the third message includes second indication information, which is access technology information, or information used to indicate signaling connection, or information used to indicate user plane connection; the second indication information is either first indication information sent by the UE received by the AMF, or the second indication information is determined by the AMF based on the first indication information sent by the UE.

[0338] The access technology type of the released PDU session is determined based on the third message;

[0339] Initiate the PDU session release process based on the access technology type.

[0340] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0341] The access technology type of the released PDU session is determined based on the second instruction information.

[0342] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0343] A first message is sent to the AMF so that the AMF can instruct the SMF to determine the access technology type of the released PDU session according to the first message; the first message includes first indication information, which is used to determine the access technology type of the released PDU session; the first indication information is access technology information, or information used to indicate signaling connection, or information used to indicate user plane connection.

[0344] Alternatively, the AMF can send a first indication message to the SMF so that the SMF can determine the access technology type of the released PDU session based on the first indication message.

[0345] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0346] Receive a fourth message sent by SMF; the fourth message includes fourth indication information; the fourth indication information is access technology information, or information used to indicate signaling connection, or information used to indicate user plane connection;

[0347] Based on the fourth message, determine the access technology type of the released PDU session;

[0348] A fifth message is sent to the UE, the fifth message including information for determining the access technology type of the released PDU session; the fifth message includes third indication information to instruct the UE to determine the access technology type of the released PDU session according to the third indication information.

[0349] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0350] Based on the fourth instruction information, determine the access technology type of the released PDU session.

[0351] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0352] Receive the PDU session release request message sent by SMF;

[0353] Alternatively, receive PDU session modification request messages sent by SMF.

[0354] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0355] A fourth message is sent to the AMF so that the AMF instructs the UE to release the PDU session according to the fourth message; the fourth message includes fourth indication information, which is used to determine the access technology type of the released PDU session;

[0356] Alternatively, the AMF can send a third indication message to the UE so that the UE can determine the access technology type of the PDU session release based on the third indication message and initiate the operation of releasing the PDU session resources of the access technology type; the third indication message is access technology information, or information used to indicate signaling connection, or information used to indicate user plane connection.

[0357] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0358] Receive the sixth message sent by the AMF; the sixth message includes the fifth indication information, which is access technology information, or information used to indicate signaling connection, or information used to indicate user plane connection. The fifth indication information is the fourth indication information sent by the SMF received by the AMF, or the fifth indication information is determined by the AMF based on the third indication information sent by the SMF.

[0359] The access technology type of the released PDU session is determined based on the sixth message;

[0360] Initiate the PDU session release process based on the access technology type.

[0361] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0362] Establish a connection with the UE through a preset protocol;

[0363] Receive the UE's connection release message, or initiate a connection release procedure to the UE;

[0364] Send a seventh message to the SMF to instruct the SMF to initiate a session release procedure; the seventh message includes information for determining the access technology type of the PDU session to be released, so that the SMF can initiate the release of the PDU session of the access technology type.

[0365] This application also provides a computer program product containing instructions that, when run on a computer, cause the computer to perform the following steps:

[0366] Receive a first message sent by a user terminal (UE); the first message includes first indication information; the first indication information is access technology information, or information used to indicate a signaling connection, or information used to indicate a user plane connection;

[0367] Based on the first message, determine the access technology type of the released Multi-Access Protocol Data Unit (PDU) session;

[0368] A second message is sent to the Session Management Control (SMF) element, which includes information for determining the access technology type of the released PDU session.

[0369] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0370] The access technology type of the released PDU session is determined based on the first instruction information.

[0371] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0372] Receive the PDU session release request message sent by the UE;

[0373] Alternatively, receive a PDU session modification request message sent by the UE.

[0374] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0375] The system receives a third message sent by the AMF; the third message includes second indication information, which is access technology information, or information used to indicate signaling connection, or information used to indicate user plane connection; the second indication information is either first indication information sent by the UE received by the AMF, or the second indication information is determined by the AMF based on the first indication information sent by the UE.

[0376] The access technology type of the released PDU session is determined based on the third message;

[0377] Initiate the PDU session release process based on the access technology type.

[0378] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0379] The access technology type of the released PDU session is determined based on the second instruction information.

[0380] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0381] A first message is sent to the AMF so that the AMF can instruct the SMF to determine the access technology type of the released PDU session according to the first message; the first message includes first indication information, which is used to determine the access technology type of the released PDU session; the first indication information is access technology information, or information used to indicate signaling connection, or information used to indicate user plane connection.

[0382] Alternatively, the AMF can send a first indication message to the SMF so that the SMF can determine the access technology type of the released PDU session based on the first indication message.

[0383] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0384] Receive a fourth message sent by SMF; the fourth message includes fourth indication information; the fourth indication information is access technology information, or information used to indicate signaling connection, or information used to indicate user plane connection;

[0385] Based on the fourth message, determine the access technology type of the released PDU session;

[0386] A fifth message is sent to the UE, the fifth message including information for determining the access technology type of the released PDU session; the fifth message includes third indication information to instruct the UE to determine the access technology type of the released PDU session according to the third indication information.

[0387] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0388] Based on the fourth instruction information, determine the access technology type of the released PDU session.

[0389] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0390] Receive the PDU session release request message sent by SMF;

[0391] Alternatively, receive PDU session modification request messages sent by SMF.

[0392] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0393] A fourth message is sent to the AMF so that the AMF instructs the UE to release the PDU session according to the fourth message; the fourth message includes a fourth indication message, the fourth indication information of which is used to determine the access technology type of the released PDU session;

[0394] Alternatively, the AMF can send a third indication message to the UE so that the UE can determine the access technology type of the PDU session release based on the third indication message and initiate the operation of releasing the PDU session resources of the access technology type; the third indication message is access technology information, or information used to indicate signaling connection, or information used to indicate user plane connection.

[0395] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0396] Receive the sixth message sent by the AMF; the sixth message includes the fifth indication information, which is access technology information, or information used to indicate signaling connection, or information used to indicate user plane connection. The fifth indication information is the fourth indication information sent by the SMF received by the AMF, or the fifth indication information is determined by the AMF based on the third indication information sent by the SMF.

[0397] The access technology type of the released PDU session is determined based on the sixth message;

[0398] Initiate the PDU session release process based on the access technology type.

[0399] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0400] Establish a connection with the UE through a preset protocol;

[0401] Receive the UE's connection release message, or initiate a connection release procedure to the UE;

[0402] Send a seventh message to the SMF to instruct the SMF to initiate a session release procedure; the seventh message includes information for determining the access technology type of the PDU session to be released, so that the SMF can initiate the release of the PDU session of the access technology type.

[0403] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the methods described above. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, or optical storage, etc. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0404] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0405] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A method for handling session release, characterized in that, The method is applied to the Access and Mobility Management Function (AMF) network element, and the method includes: Receive the first message sent by the user terminal (UE); Based on the first message, determine the access technology type of the released Multi-Access Protocol Data Unit (PDU) session; A second message is sent to the Session Management Control Network Element (SMF), the second message including information for determining the access technology type of the released PDU session.

2. The method according to claim 1, characterized in that, The first message includes first indication information; the first indication information is access technology information, or information used to indicate signaling connection, or information used to indicate user plane connection.

3. The method according to claim 2, characterized in that, The step of determining the access technology type of the released Multi-Access Protocol Data Unit (PDU) session based on the first message includes: The access technology type of the released PDU session is determined based on the first indication information.

4. The method according to claim 1, characterized in that, The first message sent by the UE includes: Receive the PDU session release request message sent by the UE; Alternatively, receive the PDU session modification request message sent by the UE.

5. A method for handling session release, characterized in that, The method is applied to SMF, and the method includes: Receive the third message sent by AMF; The access technology type of the released PDU session is determined based on the third message; Initiate a PDU session release process based on the access technology type.

6. The method according to claim 5, characterized in that, The third message includes second indication information, which is access technology information, or information used to indicate signaling connection, or information used to indicate user plane connection; the second indication information is either first indication information sent by the UE and received by the AMF, or the second indication information is determined by the AMF based on the first indication information sent by the UE.

7. The method according to claim 6, characterized in that, The access technology type of the released PDU session is determined based on the third message, including: The access technology type of the released PDU session is determined based on the second indication information.

8. A method for handling session release, characterized in that, The method is applied to a UE, and the method includes: Send a first message to the AMF so that the AMF can instruct the SMF to determine the access technology type of the released PDU session based on the first message. Alternatively, the AMF may send a first indication message to the SMF, so that the SMF can determine the access technology type of the released PDU session based on the first indication message.

9. The method according to claim 8, characterized in that, The first message includes first indication information, which is used to determine the access technology type of the released PDU session; the first indication information is access technology information, or information used to indicate signaling connection, or information used to indicate user plane connection.

10. A method for handling session release, characterized in that, The method is applied to AMF, and the method includes: Receive the fourth message sent by SMF; Based on the fourth message, determine the access technology type of the released PDU session; A fifth message is sent to the UE, the fifth message including information for determining the access technology type of the released PDU session.

11. The method according to claim 10, characterized in that, The fifth message includes a third indication information to instruct the UE to determine the access technology type of the released PDU session based on the third indication information.

12. The method according to claim 10, characterized in that, The fourth message includes fourth indication information; the fourth indication information is access technology information, or information used to indicate signaling connections, or information used to indicate user plane connections.

13. The method according to claim 12, characterized in that, The step of determining the access technology type of the released PDU session based on the fourth message includes: Based on the fourth indication information, the access technology type of the released PDU session is determined.

14. The method according to claim 10, characterized in that, The fourth message received from the SMF includes: Receive the PDU session release request message sent by the SMF; Alternatively, receive the PDU session modification request message sent by the SMF.

15. A method for handling session release, characterized in that, The method is applied to SMF, and the method includes: Send a fourth message to the AMF so that the AMF instructs the UE to release the PDU session according to the fourth message; Alternatively, the AMF can send a third indication message to the UE, so that the UE can determine the access technology type of the PDU session release based on the third indication message and initiate the operation of releasing the PDU session resources of the access technology type.

16. The method according to claim 15, characterized in that, The fourth message includes fourth indication information, which is used to determine the access technology type of the released PDU session; or, the third indication information is access technology information, or information used to indicate signaling connection, or information used to indicate user plane connection.

17. A method for handling session release, characterized in that, The method is applied to a UE, and the method includes: Receive the sixth message sent by AMF; The access technology type of the released PDU session is determined based on the sixth message; Initiate a PDU session release process based on the access technology type.

18. The method according to claim 17, characterized in that, The sixth message includes a fifth indication information, which is access technology information, or information used to indicate signaling connection, or information used to indicate user plane connection. The fifth indication information is either the fourth indication information received by the AMF from the SMF, or the fifth indication information is determined by the AMF based on the third indication information sent by the SMF.

19. A method for handling session release, characterized in that, The method is applied to a UPF, and the method includes: Establish a connection with the UE through a preset protocol; Receive the connection release message from the UE, or initiate a connection release process to the UE; Send a seventh message to the SMF to instruct the SMF to initiate a session release procedure.

20. The method according to claim 19, characterized in that, The seventh message includes information for determining the access technology type of the released PDU session, so that the SMF initiates the release of the PDU session of the access technology type.

21. A session release processing apparatus, characterized in that, The device includes: The first receiving module is used to receive the first message sent by the user terminal UE; The first determining module is used to determine the access technology type of the released multi-access protocol data unit (PDU) session based on the first message. The first sending module is used to send a second message to the Session Management Control Network Element (SMF), the second message including information for determining the access technology type of the released PDU session.

22. A session release processing apparatus, characterized in that, The device includes: The second receiving module is used to receive the third message sent by the AMF; The second determining module is used to determine the access technology type of the released PDU session based on the third message; The first release module is used to initiate a PDU session release process based on the access technology type.

23. A session release processing apparatus, characterized in that, The device includes: The second sending module sends a first message to the AMF so that the AMF instructs the SMF to determine the access technology type of the released PDU session according to the first message; or, it is used to send a first indication information to the SMF through the AMF so that the SMF instructs the SMF to determine the access technology type of the released PDU session according to the first indication information.

24. A session release processing apparatus, characterized in that, The device includes: The third receiving module is used to receive the fourth message sent by SMF; The third determining module is used to determine the access technology type of the released PDU session based on the fourth message; The third sending module is used to send a fifth message to the UE, the fifth message including information for determining the access technology type of the released PDU session.

25. A session release processing apparatus, characterized in that, The device includes: The fourth sending module is used to send a fourth message to the AMF so that the AMF instructs the UE to release the PDU session according to the fourth message; or, it is used to send a third indication information to the UE through the AMF so that the UE determines the access technology type of the PDU session release according to the third indication information and initiates the operation of releasing the PDU session resources of the access technology type.

26. A session release processing apparatus, characterized in that, The device includes: The fourth receiving module is used to receive the sixth message sent by the AMF; The third determining module is used to determine the access technology type of the released PDU session based on the sixth message; The second release module is used to initiate a PDU session release process based on the access technology type.

27. A session release processing apparatus, characterized in that, The device includes: The connection module is used to establish a connection with the UE through a preset protocol. The third release module is used to receive the connection release message from the UE, or to initiate a connection release process to the UE; The fifth sending module is used to send a seventh message to the SMF to instruct the SMF to initiate a session release process.

28. An access and mobility management device, characterized in that, include: Transmitter, receiver, and processor; The receiver is used to receive the first message sent by the user terminal UE; The processor is configured to determine the access technology type of the released Multi-Access Protocol Data Unit (PDU) session based on the first message; The transmitter is configured to send a second message to the Session Management Control Network Element (SMF), the second message including information for determining the access technology type of the released PDU session.

29. A session management and control device, characterized in that, include: Transceiver and processor; The transceiver is used to receive a third message sent by the AMF; The processor is configured to determine the access technology type of the released PDU session based on the third message; The processor is also configured to initiate a PDU session release process based on the access technology type.

30. A terminal device, characterized in that, include: transceiver; The transceiver is configured to send a first message to the AMF so that the AMF instructs the SMF to determine the access technology type of the released PDU session according to the first message; or, it is configured to send a first indication information to the SMF through the AMF so that the SMF instructs the SMF to determine the access technology type of the released PDU session according to the first indication information.

31. An access and mobility management device, characterized in that, include: Transmitter, receiver, and processor; The receiver is used to receive the fourth message sent by the SMF; The processor is configured to determine the access technology type of the released PDU session based on the fourth message; The transmitter is configured to send a fifth message to the UE, the fifth message including information for determining the access technology type of the released PDU session.

32. A session management and control device, characterized in that, include: transceiver; The transceiver is configured to send a fourth message to the AMF so that the AMF instructs the UE to release the PDU session according to the fourth message; or, it is configured to send a third indication information to the UE through the AMF so that the UE determines the access technology type of the PDU session release according to the third indication information and initiates the operation of releasing the PDU session resources of the access technology type.

33. A terminal device, characterized in that, include: Transceiver and processor; The transceiver is used to receive the sixth message sent by the AMF; The processor is configured to determine the access technology type of the released PDU session based on the sixth message; The processor is also configured to initiate a PDU session release process based on the access technology type.

34. A user plane functional device, characterized in that, include: Transceiver and processor; The processor is used to establish a connection with the UE through a preset protocol; The transceiver is used to receive the connection release message from the UE, or to initiate a connection release process to the UE; The transceiver is also used to send a seventh message to the SMF to instruct the SMF to initiate a session release procedure.

35. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 20.

36. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 20.

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