A policy control method, device and functional entity

Abstract

The present invention provides a policy control method, device and functional entity, wherein the policy control method includes: determining policy control information for a 2G network; sending the policy control information to a session management function (SMF); the policy control information includes a first sub-information indicating a policy shutdown, or a second sub-information indicating a portion of the policy used in other networks, wherein the other networks include at least one of a 4G network and a 5G network. This solution can implement policy shutdown or partial policy shutdown for a 2G network through a PCF during 2G, 4G and 5G interoperability, so that the SMF can execute policy control based on 2G subscription information or a policy applicable to 2G issued by the PCF, thereby avoiding the session interruption that may be caused by unreasonable parameter mapping executed by the SMF in the prior art, while saving N7 port signaling transmission; and effectively solves the problem in the prior art of consuming a large amount of signaling and PCF performance, and even causing communication interruption, in the policy control solution for accessing a 2G network.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a policy control method, device and functional entity. Background Art

[0002] In the existing technology, when the terminal initially accesses the 2G network or switches from other networks (such as 4G or 5G) to 2G, the SMF (session management function) interacts with the PCF (policy control function), and the PCF issues the corresponding policy through the N7 port. The QoS parameters in the policy are all 5G QoS (quality of service) parameters. The SMF finally maps the 5G QoS parameters to 2G QoS parameters via the 4G QoS parameters. In this method, when the terminal switches to the 2G network, the Npcf_SMPolicyControl_Update (i.e., session management policy control update) service is called, and the PCF issues a policy. The policy may contain unnecessary policy information and Triggers (events) for 2G, consuming a large amount of signaling and PCF performance. For example, 2G does not support dedicated carriers, and the PCF only needs to issue default rules when issuing a policy. In addition, in current technology, SMF performs mapping of 5G QoS parameters to 2G QoS parameters. Improper configuration of 5G QoS parameters and mapping rules may cause communication interruption. For example, when the Session (session)-AMBR (aggregate maximum bit rate) value applicable to 5G is mapped to the AMBR of 2G, it may exceed the 2G network capability. If the rate limit is configured on the existing SGSN and the AMBR value issued by the SMF exceeds the limit, the session will be directly rejected.

[0003] As can be seen from the above, the policy control solution for accessing 2G networks in the prior art consumes a large amount of signaling and PCF performance, and may even cause communication interruption. Summary of the Invention

[0004] The purpose of the present invention is to provide a policy control method, device and functional entity to solve the problem that the policy control solution for accessing 2G network in the prior art consumes a large amount of signaling and PCF performance, and even causes communication interruption.

[0005] In order to solve the above technical problems, an embodiment of the present invention provides a policy control method, which is applied to a policy control function entity, including:

[0006] Determine policy control information for 2G networks;

[0007] Sending the policy control information to the session management function SMF;

[0008] The policy control information includes first sub-information indicating policy shutdown, or second sub-information indicating part of the policy used in other networks, and the other networks include at least one of a 4G network and a 5G network.

[0009] Optionally, sending the policy control information to a session management function SMF includes:

[0010] During the process of the terminal accessing the 4G network, creating a response message through a first session management policy and sending the first sub-information to the SMF; or

[0011] When the terminal is in the 4G network and a session modification is performed, the first sub-information is sent to the SMF through a first session management policy update response message.

[0012] Optionally, after sending the first sub-information to the SMF, the method further includes:

[0013] receiving a second session management policy update request message sent by the SMF during the process of the terminal switching from the 4G network to the 2G network, where the second session management policy update request message carries first indication information indicating that the type of the network currently to be accessed by the terminal is a 2G network;

[0014] Feedback a second session management policy update response message to the SMF according to the first indication information, where the second session management policy update response message carries second indication information indicating rejection of the delivery policy and the first cause value;

[0015] The first reason value indicates that the type of network the terminal is currently accessing is a 2G network.

[0016] Optionally, the determining policy control information for accessing the 2G network includes:

[0017] receiving a preset request message sent by the SMF under preset conditions; the preset request message carries third indication information indicating that the type of the network currently to be accessed by the terminal is a 2G network;

[0018] Determining, according to the third indication information, the first sub-information or the second sub-information for accessing the 2G network; and executing a policy shutdown;

[0019] The sending the policy control information to the session management function SMF includes:

[0020] Feedback a preset response message to the SMF, where the preset response message carries the first sub-information or the second sub-information and the second cause value;

[0021] The preset condition is a case where the terminal initially accesses a 2G network or switches from the 5G network to a 2G network, the preset request message is a session management policy creation request message, and the preset response message is a session management policy creation response message; or,

[0022] The preset condition is that the terminal switches from the 4G network to the 2G network, the preset request message is a session management policy update request message, and the preset response message is a session management policy update response message;

[0023] The second reason value indicates that the type of the network currently to be accessed by the terminal is a 2G network.

[0024] Optionally, the determining, according to the third indication information, the second sub-information for accessing a 2G network includes:

[0025] The second sub-information for accessing the 2G network is determined according to the third indication information and the 2G network capability information.

[0026] Optionally, when the terminal initially accesses a 2G network or switches from the 5G network to the 2G network, the second sub-information includes: at least one of public land mobile network PLMN change information, access type change information, access network charging association information, identity authentication management session failure information, and radio access technology type change information; and / or,

[0027] When the terminal switches from the 4G network to the 2G network, the second sub-information includes: resource modification request information, terminal IP address change information, terminal session or resource usage reporting information, application traffic start information, application traffic end information, access network information reporting information, packet switching PS data shutdown state change information, default quality of service QoS change information, session aggregation maximum bit rate Session-AMBR change information, QoS notification information, identity authentication reallocation information, existence area change information, service area change information, policy control re-effectiveness timeout information, resource release notification information, resource allocation success notification information, reflective QoS information, packet filter number reporting information, terminal UE time zone change information, authentication information change information, delay-sensitive network bridge information information, QoS monitoring information, cell change information, evolved packet system EPS fallback information, multi-access session information, 5G rate group join IP multicast group information, 5G rate group leave IP multicast group information, data network name DDN failure information and DDN transmission status information. At least one of the information.

[0028] An embodiment of the present invention further provides a policy control method, which is applied to a session management function entity, including:

[0029] Receive policy control information for the 2G network sent by the policy control function PCF;

[0030] When the type of the network currently to be accessed by the terminal is a 2G network, performing session management according to the policy control information;

[0031] The policy control information includes first sub-information indicating policy shutdown, or second sub-information indicating part of the policy used in other networks, and the other networks include at least one of a 4G network and a 5G network.

[0032] Optionally, the receiving policy control information for the 2G network sent by the policy control function (PCF) includes:

[0033] receiving the first sub-information sent by the PCF through a first session management policy creation response message during the process of the terminal accessing the 4G network; or

[0034] The first sub-information is received, which is sent by the PCF through a first session management policy update response message when the terminal is in the 4G network and a session modification is performed.

[0035] Optionally, after receiving the first sub-information sent by the PCF, the method further includes:

[0036] During the process of the terminal switching from the 4G network to the 2G network, sending a second session management policy update request message to the PCF, where the second session management policy update request message carries first indication information indicating that the type of network currently to be accessed by the terminal is a 2G network;

[0037] receiving a second session management policy update response message fed back by the PCF according to the first indication information, where the second session management policy update response message carries second indication information indicating rejection of the delivery policy and the first cause value;

[0038] The first reason value indicates that the type of network the terminal is currently accessing is a 2G network.

[0039] Optionally, before receiving the policy control information for the 2G network sent by the policy control function PCF, the method further includes:

[0040] Under a preset condition, sending a preset request message to the PCF; the preset request message carries third indication information indicating that the type of the network currently to be accessed by the terminal is a 2G network;

[0041] The receiving policy control information for the 2G network sent by the policy control function PCF includes:

[0042] receiving a preset response message fed back by the PCF according to the third indication information, where the preset response message carries the first sub-information or the second sub-information and a second cause value;

[0043] The preset condition is a case where the terminal initially accesses a 2G network or switches from the 5G network to a 2G network, the preset request message is a session management policy creation request message, and the preset response message is a session management policy creation response message; or,

[0044] The preset condition is that the terminal switches from the 4G network to the 2G network, the preset request message is a session management policy update request message, and the preset response message is a session management policy update response message;

[0045] The second reason value indicates that the type of the network currently to be accessed by the terminal is a 2G network.

[0046] Optionally, performing session management according to the policy control information includes:

[0047] In the case where the policy control information includes the first sub-information, performing session management according to local policy configuration information or policy subscription information obtained from a preset information storage network element; or

[0048] In a case where the policy control information includes the second sub-information, session management is performed according to the partial policy indicated in the second sub-information.

[0049] Optionally, when the terminal initially accesses a 2G network or switches from the 5G network to the 2G network, the second sub-information includes: at least one of public land mobile network PLMN change information, access type change information, access network charging association information, identity authentication management session failure information, and radio access technology type change information; and / or,

[0050] When the terminal switches from the 4G network to the 2G network, the second sub-information includes: resource modification request information, terminal IP address change information, terminal session or resource usage reporting information, application traffic start information, application traffic end information, access network information reporting information, packet switching PS data shutdown state change information, default quality of service QoS change information, session aggregation maximum bit rate Session-AMBR change information, QoS notification information, identity authentication reallocation information, existence area change information, service area change information, policy control re-effectiveness timeout information, resource release notification information, resource allocation success notification information, reflective QoS information, packet filter number reporting information, terminal UE time zone change information, authentication information change information, delay-sensitive network bridge information information, QoS monitoring information, cell change information, evolved packet system EPS fallback information, multi-access session information, 5G rate group join IP multicast group information, 5G rate group leave IP multicast group information, data network name DDN failure information and DDN transmission status information. At least one of the information.

[0051] An embodiment of the present invention further provides a policy control device, which is applied to a policy control function entity and includes:

[0052] A first determining module is used to determine policy control information for a 2G network;

[0053] A first sending module, configured to send the policy control information to a session management function SMF;

[0054] The policy control information includes first sub-information indicating policy shutdown, or second sub-information indicating part of the policy used in other networks, and the other networks include at least one of a 4G network and a 5G network.

[0055] Optionally, the first sending module includes:

[0056] A first sending submodule is configured to send the first sub-information to the SMF by creating a response message through a first session management policy during the process of the terminal accessing the 4G network; or

[0057] When the terminal is in the 4G network and a session modification is performed, the first sub-information is sent to the SMF through a first session management policy update response message.

[0058] Optionally, also include:

[0059] A first receiving module is configured to, after sending the first sub-information to the SMF, receive a second session management policy update request message sent by the SMF during a process in which the terminal switches from the 4G network to the 2G network, where the second session management policy update request message carries first indication information indicating that the type of the network currently to be accessed by the terminal is a 2G network;

[0060] A first feedback module is configured to feed back a second session management policy update response message to the SMF according to the first indication information, where the second session management policy update response message carries second indication information indicating rejection of the delivery policy and a first reason value;

[0061] The first reason value indicates that the type of network the terminal is currently accessing is a 2G network.

[0062] Optionally, the first determining module includes:

[0063] A first receiving submodule is configured to receive a preset request message sent by the SMF under preset conditions; the preset request message carries third indication information indicating that the type of the network currently to be accessed by the terminal is a 2G network;

[0064] A first determining submodule is configured to determine the first sub-information or the second sub-information for accessing the 2G network according to the third indication information; and execute a policy shutdown;

[0065] The first sending module includes:

[0066] A first feedback submodule is configured to feed back a preset response message to the SMF, where the preset response message carries the first sub-information or the second sub-information and a second cause value;

[0067] The preset condition is a case where the terminal initially accesses a 2G network or switches from the 5G network to a 2G network, the preset request message is a session management policy creation request message, and the preset response message is a session management policy creation response message; or,

[0068] The preset condition is that the terminal switches from the 4G network to the 2G network, the preset request message is a session management policy update request message, and the preset response message is a session management policy update response message;

[0069] The second reason value indicates that the type of the network currently to be accessed by the terminal is a 2G network.

[0070] Optionally, the determining, according to the third indication information, the second sub-information for accessing a 2G network includes:

[0071] The second sub-information for accessing the 2G network is determined according to the third indication information and the 2G network capability information.

[0072] Optionally, when the terminal initially accesses a 2G network or switches from the 5G network to the 2G network, the second sub-information includes: at least one of public land mobile network PLMN change information, access type change information, access network charging association information, identity authentication management session failure information, and radio access technology type change information; and / or,

[0073] When the terminal switches from the 4G network to the 2G network, the second sub-information includes: resource modification request information, terminal IP address change information, terminal session or resource usage reporting information, application traffic start information, application traffic end information, access network information reporting information, packet switching PS data shutdown state change information, default quality of service QoS change information, session aggregation maximum bit rate Session-AMBR change information, QoS notification information, identity authentication reallocation information, existence area change information, service area change information, policy control re-effectiveness timeout information, resource release notification information, resource allocation success notification information, reflective QoS information, packet filter number reporting information, terminal UE time zone change information, authentication information change information, delay-sensitive network bridge information information, QoS monitoring information, cell change information, evolved packet system EPS fallback information, multi-access session information, 5G rate group join IP multicast group information, 5G rate group leave IP multicast group information, data network name DDN failure information and DDN transmission status information. At least one of the information.

[0074] An embodiment of the present invention further provides a policy control device, which is applied to a session management function entity and includes:

[0075] A second receiving module is used to receive policy control information for the 2G network sent by the policy control function PCF;

[0076] A first processing module is configured to perform session management according to the policy control information when the type of the network currently to be accessed by the terminal is a 2G network;

[0077] The policy control information includes first sub-information indicating policy shutdown, or second sub-information indicating part of the policy used in other networks, and the other networks include at least one of a 4G network and a 5G network.

[0078] Optionally, the second receiving module includes:

[0079] A second receiving submodule is configured to receive the first sub-information sent by the PCF through a first session management policy creation response message during the process of the terminal accessing the 4G network; or

[0080] The first sub-information is received, which is sent by the PCF through a first session management policy update response message when the terminal is in the 4G network and a session modification is performed.

[0081] Optionally, also include:

[0082] a second sending module, configured to, after receiving the first sub-information sent by the PCF, send a second session management policy update request message to the PCF during a process in which the terminal switches from the 4G network to the 2G network, where the second session management policy update request message carries first indication information indicating that the type of network currently to be accessed by the terminal is a 2G network;

[0083] A third receiving module is configured to receive a second session management policy update response message fed back by the PCF according to the first indication information, where the second session management policy update response message carries second indication information indicating rejection of the delivery policy and a first cause value;

[0084] The first reason value indicates that the type of network the terminal is currently accessing is a 2G network.

[0085] Optionally, also include:

[0086] A third sending module is configured to, before receiving the policy control information for the 2G network sent by the policy control function PCF, send a preset request message to the PCF under preset conditions; the preset request message carries third indication information indicating that the type of the network currently to be accessed by the terminal is a 2G network;

[0087] The second receiving module includes:

[0088] a third receiving submodule, configured to receive a preset response message fed back by the PCF according to the third indication information, where the preset response message carries the first sub-information or the second sub-information, and a second cause value;

[0089] The preset condition is a case where the terminal initially accesses a 2G network or switches from the 5G network to a 2G network, the preset request message is a session management policy creation request message, and the preset response message is a session management policy creation response message; or,

[0090] The preset condition is that the terminal switches from the 4G network to the 2G network, the preset request message is a session management policy update request message, and the preset response message is a session management policy update response message;

[0091] The second reason value indicates that the type of the network currently to be accessed by the terminal is a 2G network.

[0092] Optionally, the first processing module includes:

[0093] a first processing submodule configured to perform session management according to local policy configuration information or policy subscription information obtained from a preset information storage network element when the policy control information includes the first sub-information; or

[0094] In a case where the policy control information includes the second sub-information, session management is performed according to the partial policy indicated in the second sub-information.

[0095] Optionally, when the terminal initially accesses a 2G network or switches from the 5G network to the 2G network, the second sub-information includes: at least one of public land mobile network PLMN change information, access type change information, access network charging association information, identity authentication management session failure information, and radio access technology type change information; and / or,

[0096] When the terminal switches from the 4G network to the 2G network, the second sub-information includes: resource modification request information, terminal IP address change information, terminal session or resource usage reporting information, application traffic start information, application traffic end information, access network information reporting information, packet switching PS data shutdown state change information, default quality of service QoS change information, session aggregation maximum bit rate Session-AMBR change information, QoS notification information, identity authentication reallocation information, existence area change information, service area change information, policy control re-effectiveness timeout information, resource release notification information, resource allocation success notification information, reflective QoS information, packet filter number reporting information, terminal UE time zone change information, authentication information change information, delay-sensitive network bridge information information, QoS monitoring information, cell change information, evolved packet system EPS fallback information, multi-access session information, 5G rate group join IP multicast group information, 5G rate group leave IP multicast group information, data network name DDN failure information and DDN transmission status information. At least one of the information.

[0097] An embodiment of the present invention further provides a functional entity, which is a policy control functional entity and includes: a processor and a transceiver;

[0098] The processor is configured to determine policy control information for a 2G network;

[0099] Sending the policy control information to the session management function SMF via the transceiver;

[0100] The policy control information includes first sub-information indicating policy shutdown, or second sub-information indicating part of the policy used in other networks, and the other networks include at least one of a 4G network and a 5G network.

[0101] Optionally, the processor is specifically configured to:

[0102] Using the transceiver, during the process of the terminal accessing the 4G network, creating a response message through a first session management policy and sending the first sub-information to the SMF; or,

[0103] When the terminal is in the 4G network and a session modification is performed, the transceiver is used to send the first sub-information to the SMF through a first session management policy update response message.

[0104] Optionally, the processor is further configured to:

[0105] After sending the first sub-information to the SMF, receiving, through the transceiver, a second session management policy update request message sent by the SMF during the process of the terminal switching from the 4G network to the 2G network, where the second session management policy update request message carries first indication information indicating that the type of the network currently to be accessed by the terminal is a 2G network;

[0106] Feedback a second session management policy update response message to the SMF through the transceiver according to the first indication information, where the second session management policy update response message carries second indication information indicating rejection of the delivery policy and a first cause value;

[0107] The first reason value indicates that the type of network the terminal is currently accessing is a 2G network.

[0108] Optionally, the processor is specifically configured to:

[0109] receiving, by the transceiver, a preset request message sent by the SMF under preset conditions; the preset request message carries third indication information indicating that the type of the network currently to be accessed by the terminal is a 2G network;

[0110] Determining, according to the third indication information, the first sub-information or the second sub-information for accessing the 2G network; and executing a policy shutdown;

[0111] The processor is specifically configured to:

[0112] Feedback a preset response message to the SMF through the transceiver, where the preset response message carries the first sub-information or the second sub-information and the second cause value;

[0113] The preset condition is a case where the terminal initially accesses a 2G network or switches from the 5G network to a 2G network, the preset request message is a session management policy creation request message, and the preset response message is a session management policy creation response message; or,

[0114] The preset condition is that the terminal switches from the 4G network to the 2G network, the preset request message is a session management policy update request message, and the preset response message is a session management policy update response message;

[0115] The second reason value indicates that the type of the network currently to be accessed by the terminal is a 2G network.

[0116] Optionally, the processor is specifically configured to:

[0117] The second sub-information for accessing the 2G network is determined according to the third indication information and the 2G network capability information.

[0118] Optionally, when the terminal initially accesses a 2G network or switches from the 5G network to the 2G network, the second sub-information includes: at least one of public land mobile network PLMN change information, access type change information, access network charging association information, identity authentication management session failure information, and radio access technology type change information; and / or,

[0119] When the terminal switches from the 4G network to the 2G network, the second sub-information includes: resource modification request information, terminal IP address change information, terminal session or resource usage reporting information, application traffic start information, application traffic end information, access network information reporting information, packet switching PS data shutdown state change information, default quality of service QoS change information, session aggregation maximum bit rate Session-AMBR change information, QoS notification information, identity authentication reallocation information, existence area change information, service area change information, policy control re-effectiveness timeout information, resource release notification information, resource allocation success notification information, reflective QoS information, packet filter number reporting information, terminal UE time zone change information, authentication information change information, delay-sensitive network bridge information information, QoS monitoring information, cell change information, evolved packet system EPS fallback information, multi-access session information, 5G rate group join IP multicast group information, 5G rate group leave IP multicast group information, data network name DDN failure information and DDN transmission status information. At least one of the information.

[0120] An embodiment of the present invention further provides a functional entity, which is a session management functional entity, including: a processor and a transceiver;

[0121] The processor is configured to receive, through the transceiver, policy control information for the 2G network sent by the policy control function PCF;

[0122] When the type of the network currently to be accessed by the terminal is a 2G network, performing session management according to the policy control information;

[0123] The policy control information includes first sub-information indicating policy shutdown, or second sub-information indicating part of the policy used in other networks, and the other networks include at least one of a 4G network and a 5G network.

[0124] Optionally, the processor is specifically configured to:

[0125] Receiving, by the transceiver, the first sub-information sent by the PCF through a first session management policy creation response message during the process of the terminal accessing the 4G network; or

[0126] The first sub-information is received by the transceiver when the terminal is in the 4G network and the session is modified. The PCF sends the first sub-information through a first session management policy update response message.

[0127] Optionally, the processor is further configured to:

[0128] After receiving the first sub-information sent by the PCF, during a process in which the terminal switches from the 4G network to the 2G network, sending a second session management policy update request message to the PCF through the transceiver, where the second session management policy update request message carries first indication information indicating that the type of network currently to be accessed by the terminal is a 2G network;

[0129] receiving, by the transceiver, a second session management policy update response message fed back by the PCF according to the first indication information, wherein the second session management policy update response message carries second indication information indicating rejection of the delivery policy and a first cause value;

[0130] The first reason value indicates that the type of network the terminal is currently accessing is a 2G network.

[0131] Optionally, the processor is further configured to:

[0132] Before receiving the policy control information for the 2G network sent by the policy control function PCF, under preset conditions, sending a preset request message to the PCF through the transceiver; the preset request message carries third indication information indicating that the type of the network currently to be accessed by the terminal is a 2G network;

[0133] The processor is specifically configured to:

[0134] receiving, through the transceiver, a preset response message fed back by the PCF according to the third indication information, where the preset response message carries the first sub-information or the second sub-information, and a second cause value;

[0135] The preset condition is a case where the terminal initially accesses a 2G network or switches from the 5G network to a 2G network, the preset request message is a session management policy creation request message, and the preset response message is a session management policy creation response message; or,

[0136] The preset condition is that the terminal switches from the 4G network to the 2G network, the preset request message is a session management policy update request message, and the preset response message is a session management policy update response message;

[0137] The second reason value indicates that the type of the network currently to be accessed by the terminal is a 2G network.

[0138] Optionally, the processor is specifically configured to:

[0139] In the case where the policy control information includes the first sub-information, performing session management according to local policy configuration information or policy subscription information obtained from a preset information storage network element; or

[0140] In a case where the policy control information includes the second sub-information, session management is performed according to the partial policy indicated in the second sub-information.

[0141] Optionally, when the terminal initially accesses a 2G network or switches from the 5G network to the 2G network, the second sub-information includes: at least one of public land mobile network PLMN change information, access type change information, access network charging association information, identity authentication management session failure information, and radio access technology type change information; and / or,

[0142] When the terminal switches from the 4G network to the 2G network, the second sub-information includes: resource modification request information, terminal IP address change information, terminal session or resource usage reporting information, application traffic start information, application traffic end information, access network information reporting information, packet switching PS data shutdown state change information, default quality of service QoS change information, session aggregation maximum bit rate Session-AMBR change information, QoS notification information, identity authentication reallocation information, existence area change information, service area change information, policy control re-effectiveness timeout information, resource release notification information, resource allocation success notification information, reflective QoS information, packet filter number reporting information, terminal UE time zone change information, authentication information change information, delay-sensitive network bridge information information, QoS monitoring information, cell change information, evolved packet system EPS fallback information, multi-access session information, 5G rate group join IP multicast group information, 5G rate group leave IP multicast group information, data network name DDN failure information and DDN transmission status information. At least one of the information.

[0143] An embodiment of the present invention also provides a functional entity, including a memory, a processor, and a program stored on the memory and runnable on the processor; when the processor executes the program, the policy control method on the policy control functional entity side is implemented; or, when the processor executes the program, the policy control method on the session management functional entity side is implemented.

[0144] An embodiment of the present invention also provides a readable storage medium on which a program is stored, which, when executed by a processor, implements the steps of the policy control method on the policy control function entity side; or, when executed by a processor, implements the steps of the policy control method on the session management function entity side.

[0145] The beneficial effects of the above technical solution of the present invention are as follows:

[0146] In the above scheme, the policy control method determines the policy control information for the 2G network; sends the policy control information to the session management function SMF; wherein the policy control information includes a first sub-information indicating a policy shutdown, or a second sub-information indicating part of the policy used in other networks, and the other networks include at least one of a 4G network and a 5G network; it can realize the 2G, 4G and 5G interoperability process, through the PCF to execute policy shutdown or partial policy shutdown for the 2G network, so that the SMF can execute policy control according to the 2G subscription information or the policy applicable to 2G issued by the PCF, avoiding the session interruption that may be caused by the unreasonable parameter mapping executed by the SMF in the prior art, while saving the N7 port signaling transmission; it is a good solution to the problem that the policy control scheme for accessing the 2G network in the prior art consumes a lot of signaling and PCF performance, and even causes communication interruption. BRIEF DESCRIPTION OF THE DRAWINGS

[0147] Figure 1 This is a schematic diagram of the policy control method process of an embodiment of the present invention. Figure 1 ;

[0148] Figure 2 This is a schematic diagram of the policy control method process of an embodiment of the present invention. Figure 2 ;

[0149] Figure 3 Schematic diagram of the session management policy connection establishment process according to an embodiment of the present invention Figure 1 ;

[0150] Figure 4 The session management policy update process of the embodiment of the present invention is shown as follows: Figure 1 ;

[0151] Figure 5 The session management policy update process of the embodiment of the present invention is shown as follows: Figure 2 ;

[0152] Figure 6 Schematic diagram of the session management policy connection establishment process according to an embodiment of the present invention Figure 2 ;

[0153] Figure 7 Schematic diagram of the structure of the policy control device according to an embodiment of the present invention Figure 1 ;

[0154] Figure 8 Schematic diagram of the structure of the policy control device according to an embodiment of the present invention Figure 2 ;

[0155] Figure 9 Schematic diagram of the functional entity structure of an embodiment of the present invention Figure 1 ;

[0156] Figure 10 Schematic diagram of the functional entity structure of an embodiment of the present invention Figure 2 . DETAILED DESCRIPTION

[0157] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0158] The present invention aims to solve the problem that the policy control scheme for accessing 2G network in the existing technology consumes a lot of signaling and PCF performance, and even causes communication interruption. The present invention provides a policy control method applied to the policy control function entity, such as Figure 1 Shown, including:

[0159] Step 11: Determine policy control information for the 2G network;

[0160] Step 12: Send the policy control information to the session management function SMF; wherein the policy control information includes a first sub-information indicating policy shutdown, or a second sub-information indicating part of the policy used in other networks, and the other networks include at least one of a 4G network and a 5G network.

[0161] Some of these strategies are determined based on 2G capabilities and match 2G subscription information.

[0162] The policy control method provided by the embodiment of the present invention determines the policy control information for the 2G network; sends the policy control information to the session management function SMF; wherein the policy control information includes a first sub-information indicating a policy shutdown, or a second sub-information indicating part of the policy used in other networks, and the other networks include at least one of a 4G network and a 5G network; it can realize the execution of policy shutdown or partial policy shutdown for the 2G network through the PCF during the 2G, 4G and 5G interoperability process, so that the SMF can execute policy control according to the 2G subscription information or the policy applicable to 2G issued by the PCF, avoiding the session interruption that may be caused by the unreasonable parameter mapping executed by the SMF in the prior art, while saving the N7 port signaling transmission; it well solves the problem that the policy control scheme for accessing the 2G network in the prior art consumes a lot of signaling and PCF performance, and even causes communication interruption. The 2G-applicable policy issued by PCF can be issued directly or indirectly. Direct issuance can be an activation event (which can also be understood as the information issued is the policy applicable to 2G), and indirect issuance can be a deactivation event (which can also be understood as the information issued is the policy to be deactivated, and SMF can obtain the policy applicable to 2G based on this).

[0163] The sending of the policy control information to the session management function SMF includes: during the process of the terminal accessing the 4G network, creating a response message through a first session management policy, and sending the first sub-information to the SMF; or, when the terminal is in the 4G network and the session is modified, updating the first sub-information to the SMF through a first session management policy update response message.

[0164] Furthermore, after sending the first sub-information to the SMF, it also includes: receiving a second session management policy update request message sent by the SMF during the process of the terminal switching from the 4G network to the 2G network, the second session management policy update request message carrying first indication information indicating that the type of the network currently to be accessed by the terminal is a 2G network; based on the first indication information, feeding back a second session management policy update response message to the SMF, the second session management policy update response message carrying second indication information indicating a refusal to issue the policy and a first reason value; wherein, the first reason value indicates that the type of the network currently to be accessed by the terminal is a 2G network.

[0165] The determining of the policy control information for accessing the 2G network includes: receiving a preset request message sent by the SMF under a preset condition; the preset request message carries third indication information indicating that the type of the network currently to be accessed by the terminal is a 2G network; determining, based on the third indication information, the first sub-information or the second sub-information for accessing the 2G network; and performing policy shutdown; and sending the policy control information to the session management function (SMF) includes: feeding back a preset response message to the SMF, the preset response message carrying the first sub-information or the second sub-information (i.e., the message carries a partial shutdown or activation policy) and a second cause value; wherein the preset condition is a case where the terminal initially accesses the 2G network or switches from the 5G network to the 2G network, the preset request message is a session management policy creation request message, and the preset response message is a session management policy creation response message; or, the preset condition is a case where the terminal switches from the 4G network to the 2G network, the preset request message is a session management policy update request message, and the preset response message is a session management policy update response message; and the second cause value indicates that the type of the network currently to be accessed by the terminal is a 2G network.

[0166] Specifically, determining the second sub-information for accessing the 2G network according to the third indication information includes: determining the second sub-information for accessing the 2G network according to the third indication information and 2G network capability information.

[0167] In an embodiment of the present invention, when the terminal initially accesses the 2G network or switches from the 5G network to the 2G network, the second sub-information includes: public land mobile network PLMN change information, access type change, access network billing association information, identity authentication management session failure information and wireless access technology type change information (specifically corresponding to an activation event); and / or, when the terminal switches from the 4G network to the 2G network, the second sub-information includes: resource modification request information, terminal IP address change information, terminal session or resource usage reporting information, application traffic start information, application traffic end information, access network information reporting information, packet switching PS data closed state change information, default service quality QoS change information, and conference At least one of the following information: Session-AMBR change information, QoS notification information, identity authentication reallocation information, existence area change information, service area change information, policy control re-validation timeout information, resource release notification information, resource allocation success notification information, reflected QoS information, packet filter number reporting information, terminal UE time zone change information, authentication information change information, delay-sensitive network bridge information, QoS monitoring information, cell change information, evolved packet system EPS fallback information, multi-access session information, 5G rate group joining IP multicast group information, 5G rate group leaving IP multicast group information, data network name DDN failure information, and DDN transmission status information (specifically corresponding to a deactivation event).

[0168] The embodiment of the present invention also provides a policy control method, which is applied to a session management function entity, such as Figure 2 Shown, including:

[0169] Step 21: Receive policy control information for the 2G network sent by the policy control function PCF;

[0170] Step 22: When the type of network currently to be accessed by the terminal is a 2G network, session management is performed according to the policy control information; wherein the policy control information includes a first sub-information indicating a policy shutdown, or a second sub-information indicating part of the policy used in other networks, and the other networks include at least one of a 4G network and a 5G network.

[0171] The policy control method provided by the embodiment of the present invention receives policy control information for the 2G network sent by the policy control function PCF; when the type of the network to be currently accessed by the terminal is a 2G network, session management is performed according to the policy control information; wherein, the policy control information includes a first sub-information indicating a policy shutdown, or a second sub-information indicating part of the policy used in other networks, and the other networks include at least one of a 4G network and a 5G network; it can realize the execution of policy shutdown or partial policy shutdown for the 2G network through PCF during 2G, 4G and 5G interoperability, so that the SMF can execute policy control according to the 2G subscription information or the policy applicable to 2G issued by the PCF, avoiding the session interruption that may be caused by the unreasonable parameter mapping executed by the SMF in the prior art, while saving the N7 port signaling transmission; it well solves the problem that the policy control scheme for accessing the 2G network in the prior art consumes a lot of signaling and PCF performance, and even causes communication interruption. The 2G-applicable policy issued by PCF can be issued directly or indirectly. Direct issuance can be an activation event (which can also be understood as the information issued is the policy applicable to 2G), and indirect issuance can be a deactivation event (which can also be understood as the information issued is the policy to be deactivated, and SMF can obtain the policy applicable to 2G based on this).

[0172] Among them, the receiving policy control information for the 2G network sent by the policy control function PCF includes: receiving the first sub-information sent by the PCF through a first session management policy creation response message when the terminal accesses the 4G network; or receiving the first sub-information sent by the PCF through a first session management policy update response message when the terminal is in the 4G network and the session is modified.

[0173] Furthermore, after receiving the first sub-information sent by the PCF, it also includes: during the process of the terminal switching from the 4G network to the 2G network, sending a second session management policy update request message to the PCF, the second session management policy update request message carrying first indication information indicating that the type of network currently to be accessed by the terminal is a 2G network; receiving a second session management policy update response message fed back by the PCF based on the first indication information, the second session management policy update response message carrying second indication information indicating a refusal to issue the policy and a first reason value; wherein, the first reason value indicates that the type of network currently to be accessed by the terminal is a 2G network.

[0174] In an embodiment of the present invention, before receiving the policy control information for the 2G network sent by the policy control function PCF, the method further includes: sending a preset request message to the PCF under a preset condition; the preset request message carries third indication information indicating that the type of the network currently to be accessed by the terminal is a 2G network; and receiving the policy control information for the 2G network sent by the policy control function PCF includes: receiving a preset response message fed back by the PCF based on the third indication information, the preset response message carrying the first sub-information or the second sub-information (i.e., the message carries a partial shutdown or activation policy) and a second cause value. The preset condition is that the terminal initially accesses the 2G network or switches from the 5G network to the 2G network, the preset request message is a session management policy creation request message, and the preset response message is a session management policy creation response message; or the preset condition is that the terminal switches from the 4G network to the 2G network, the preset request message is a session management policy update request message, and the preset response message is a session management policy update response message; and the second cause value indicates that the type of the network currently to be accessed by the terminal is a 2G network.

[0175] The performing session management according to the policy control information includes: when the policy control information includes the first sub-information, performing session management according to local policy configuration information or policy subscription information obtained from a preset information storage network element; or, when the policy control information includes the second sub-information, performing session management according to the partial policy indicated in the second sub-information. The indicated partial policy can be an activation event (which can be understood as activated information or an activated policy) or a deactivation event (which can be understood as deactivated information or a deactivated policy), which is not limited here.

[0176] The local policy configuration information and the obtained policy subscription information are matched with the 2G subscription information. The local policy configuration information may include QoS parameter information and event information. The preset information storage network element may be the Home Subscriber Server (HSS) or the Unified Data Management (UDM). The policy subscription information may include QoS parameter information.

[0177] In an embodiment of the present invention, when the terminal initially accesses the 2G network or switches from the 5G network to the 2G network, the second sub-information includes: public land mobile network PLMN change information, access type change, access network billing association information, identity authentication management session failure information and wireless access technology type change information (specifically corresponding to an activation event); and / or, when the terminal switches from the 4G network to the 2G network, the second sub-information includes: resource modification request information, terminal IP address change information, terminal session or resource usage reporting information, application traffic start information, application traffic end information, access network information reporting information, packet switching PS data closed state change information, default service quality QoS change information, and conference At least one of the following information: Session-AMBR change information, QoS notification information, identity authentication reallocation information, existence area change information, service area change information, policy control re-validation timeout information, resource release notification information, resource allocation success notification information, reflected QoS information, packet filter number reporting information, terminal UE time zone change information, authentication information change information, delay-sensitive network bridge information, QoS monitoring information, cell change information, evolved packet system EPS fallback information, multi-access session information, 5G rate group joining IP multicast group information, 5G rate group leaving IP multicast group information, data network name DDN failure information, and DDN transmission status information (specifically corresponding to a deactivation event).

[0178] The policy control method provided by the embodiment of the present invention is further described below in conjunction with multiple sides such as a policy control function entity and a session management function entity.

[0179] In response to the above technical problems, an embodiment of the present invention provides a policy control method, which can be specifically implemented as a method for executing policy shutdown or partial policy shutdown through PCF, involving: in the 2G, 4G and 5G converged architecture, if the terminal is accessed by 2G (it can be initial access or switching access), PCF executes policy shutdown or partial policy shutdown. If the PCF policy is shut down, SMF executes policy control based on local configuration (i.e. the above-mentioned local policy configuration information) or contract information (i.e. the above-mentioned policy contract information, also referred to as contract policy information); if PCF deactivates part of the policy and then issues it, SMF executes according to the policy issued by PCF (i.e. the partial policy indicated in the above-mentioned second sub-information).

[0180] The embodiments of the present invention provide the following three solutions:

[0181] The first is that the PCF pre-sends an indication of 2G policy shutdown (corresponding to the case where the first sub-information is sent through the first session management policy creation response message or the first session management policy update response message). After the terminal switches to the 2G network, the SMF manages the session based on the local configuration (including QoS parameter information and event information) or subscription information (including QoS parameter information) and notifies the PCF. The PCF executes the policy shutdown. The subscription information can be obtained using the home subscriber server HSS or the unified data management platform UDM.

[0182] The second type is when the terminal initially accesses 2G, or switches from 4G or 5G to 2G, the PCF performs a policy shutdown on the "GERA (i.e. 2G)" access network type. The message returned to the SMF does not carry policy information, but carries a cause value indicating that the current PCF is in a policy shutdown state (i.e., the above-mentioned feedback preset response message, which carries the first sub-information). The SMF manages the session according to the local configuration or contract information;

[0183] The third method is to send a policy for the "GERA" access type when the terminal initially accesses 2G or switches from 4G or 5G to 2G. The policy deactivates some of the policies used in 4G or 5G (i.e., the aforementioned preset feedback response message, which carries the second sub-information). The SMF performs session management functions according to the policy sent by the PCF. This solution is applicable to scenarios where operators require that policies must be decided and issued by the PCF. Some policies can be determined based on 2G capabilities.

[0184] The following is an example of the solution provided in the embodiment of the present invention.

[0185] Example 1 (corresponding to the first solution above):

[0186] The terminal accesses 4G and the session is established (such as Figure 3 as shown) or update process (as shown Figure 4 As shown), PCF sends a policy to SMF. The policy includes an indication parameter, which indicates that when the terminal switches to the 2G network, PCF executes the policy shutdown. SMF manages the session based on local configuration or contract information and notifies PCF. Figure 3 It can be understood as the process of establishing SM Policy (session management policy) connection between SMF and PCF. Figure 4 It can be understood as the process of updating session management related policies.

[0187] 1. Perform steps 1a or 1b below:

[0188] 1a. When the terminal accesses 4G, during the session establishment process, the Npcf_SMPolicyControl_Create (session management policy creation) service can be called. The process is as follows: Figure 3 As shown, SMF can send a request with a message format of POST to PCF, and PCF replies "201Created (i.e., creation response message, corresponding to the above-mentioned first session management policy creation response message)", and the message body may include PCC (Policy and Charging Control) policy and Triggers (events) that trigger policy updates. Among them, the PCC policy includes the policy for 2G access, that is, an indication parameter, which indicates that the PCF executes a policy shutdown for the 2G network, and the SMF manages the session according to the local configuration or contract information; the session establishment is performed during the 4G access process.

[0189] 1b. When the terminal accesses 4G, during the session modification process, the Npcf_SMPolicyControl_Update (session management policy update) service is called. The process is as follows: Figure 4 As shown, SMF can send a message in the POST format to PCF to request an update of SMPolicy, and PCF replies "200OK (i.e., an update response message, corresponding to the above-mentioned first session management policy update response message)", and the message body may include PCC policy and Triggers for triggering policy updates, wherein the PCC policy includes the policy for 2G access, i.e., an indication parameter, indicating that the PCF executes a policy shutdown for the 2G network, and SMF manages the session according to local configuration or contract information; the session update is performed after the access is completed.

[0190] 2. When the terminal accesses 2G (specifically, during the switching process from 4G to 2G), SMF performs session management based on local configuration or contract information, and calls the service Npcf_SMPolicyControl_Update (corresponding to the above-mentioned second session management policy update request message) to report to PCF, such as Figure 5 As shown, the message body may include SMPolicyUpdateContextData (session management policy update context data), which carries the "RAT_TY_CH (radio access technology type change)" and "ratType (radio access technology type)" parameters, with the parameter value being the 2G radio access type "GERA". The PCF recognizes the 2G information and returns a Response message (i.e., the second session management policy update response message mentioned above). This message indicates that the PCF refuses to issue the policy, such as "403 Forbidden". The message carries a cause value (i.e., the first cause value mentioned above) indicating that the current terminal is accessed via 2G, such as "GERA". Operation 2 can inform the PCF of the current policy status of the terminal. Figure 5 It can be understood as the process of updating session management related policies when accessing 2G.

[0191] Example 2 (corresponding to the second solution above):

[0192] When the terminal initially accesses the 2G network or switches from the 4G or 5G network to the 2G network (which can also be understood as the process of accessing the 2G network), the SMF initiates the SM Policy establishment or update process to the PCF, and the PCF returns a message to the SMF. The message carries a reason value indicating that the current PCF is in a policy shutdown state. The SMF manages the session according to the local configuration or contract information.

[0193] 1. Perform steps 1a or 1b below:

[0194] 1a. When the terminal initially accesses 2G or switches from 5G to 2G (which can also be understood as the 2G access process), SMF interacts with PCF to establish an SM Policy connection, such as Figure 6 As shown. SMF can send a message with a message format of POST (i.e. the above-mentioned preset request message), which carries the 2G wireless access type information (i.e. the type of network to be accessed) "GERA". After PCF detects the 2G information, it executes the policy shutdown and returns a Response message (i.e. the above-mentioned preset response message) to instruct SMF to manage the session based on local configuration or contract information, such as "403 Forbidden". The reason value carried in the message indicates that the current terminal is accessed by 2G, such as "GERA" (corresponding to the above-mentioned preset response message carrying the first sub-information and the second reason value). Figure 6 This can be understood as the terminal establishing an SM Policy connection during the 2G access process.

[0195] 1b. When the terminal switches from 4G to 2G, it calls the Npcf_SMPolicyControl_Update service (corresponding to the above preset request message). The process is as follows: Figure 6 As shown, the specific content contained in the POST message and the Response message (such as the specific numerical value used) may be different. The SMF can send a message in the POST format to the PCF to request an update of the SMPolicy, which carries the "RAT_TY_CH" and "ratType" parameters, and the parameter value is the 2G wireless access type "GERA"; the PCF identifies the 2G information, executes the policy shutdown, and returns a Response message (that is, the above-mentioned preset response message), which indicates that the PCF refuses to issue the policy, such as "403Forbidden", which carries a reason value indicating that the current terminal is accessed by 2G, such as "GERA" (corresponding to the above-mentioned preset response message carrying the first sub-information and the second reason value).

[0196] 2. After receiving the Response message, SMF manages the session based on local configuration or contract information.

[0197] Example 3 (corresponding to the third solution above):

[0198] When the terminal initially accesses the 2G network or switches from the 4G or 5G network to the 2G network (which can also be understood as the process of accessing the 2G network), the SMF initiates the SM Policy establishment or update process to the PCF. The PCF makes policy decisions, activates some policies used in 4G or 5G, and sends them to the SMF. The SMF executes according to the policies sent by the PCF.

[0199] 1. Perform steps 1a or 1b below:

[0200] 1a. When the terminal initially accesses 2G or switches from 5G to 2G (which can also be understood as the 2G access process), SMF interacts with PCF to establish an SM Policy connection, such as Figure 3 As shown, the content contained in the POST message and the "201 Created" message is different. Specifically, the SMF can send a message in the POST format (i.e., the above-mentioned preset request message), which carries the 2G wireless access type information "GERA", and the PCF sends the 2G policy (corresponding to the second sub-information and the second cause value carried in the above-mentioned preset response message). The PCC rules only include default rules, and the QoS parameters are parameters applicable to 2G. The subscribed Trigger list can be shown in Table 1.

[0201] Table 1 Trigger list subscribed by PCF during 2G access

[0202]

[0203]

[0204] 1b. When the terminal switches from 4G to 2G, it calls the Npcf_SMPolicyControl_Update service (corresponding to the above preset request message). The process is as follows: Figure 4 As shown, the content contained in the POST message and the "200OK" message is different. Specifically, the SMF can send a message in the POST format to the PCF to request an update of the SMPolicy, which carries the "RAT_TY_CH" and "ratType" parameters, and the parameter value is the 2G wireless access type "GERA"; the PCF identifies the 2G information, makes a policy decision, and returns "200OK (i.e., the above-mentioned preset response message)", the message body contains the 2G policy (corresponding to the above-mentioned preset response message carrying the first sub-information and the second cause value), the PCC rules only include the default rules, and the QoS parameters are parameters applicable to 2G. The deactivated Trigger list can be shown in Table 2.

[0205] Table 2 PCF deactivation trigger list for 2G access

[0206]

[0207]

[0208] 2.SMF manages the session based on the received policy.

[0209] As can be seen from the above, the solutions provided by the embodiments of the present invention involve:

[0210] 1. PCF pre-delivers a policy to shut down the 2G network. Specifically:

[0211] (1) The policy sent by the PCF to the SMF during non-2G access contains an indication parameter, which indicates that when the terminal is accessed by 2G, the PCF executes the policy shutdown;

[0212] (2) The SMF identifies the 2G access type and performs policy control based on local configuration or subscription information. The POST message sent to the PCF contains the access network type information element, whose value is the 2G type "GERA";

[0213] (3) PCF executes the policy shutdown and returns a message. The message does not carry policy information, but only indicates that PCF knows that the terminal is currently accessed by the 2G network.

[0214] 2. After the PCF identifies the "GERA" access network type, it executes the policy shutdown and issues instructions to notify the SMF to manage the session based on the contract information. Specifically:

[0215] (1) PCF identifies the "GERA" access type, makes a decision based on the type, and decides to execute the policy shutdown;

[0216] (2) PCF returns a message to SMF, which contains a cause value instructing SMF to execute policy control until switching to 4G or 5G network (i.e., corresponding to the above rejection of policy issuance and issuance of cause value);

[0217] (3) The SMF performs policy control based on local configuration or contract information and manages the session until it detects 4G or 5G access type information and requests policy from the PCF again.

[0218] 3. PCF identifies the "GERA" access network type, makes policy decisions, and deactivates some policies. SMF manages sessions based on the policies issued by PCF. Specifically:

[0219] (1) The PCF identifies the "GERA" access type, makes decisions based on this type, and deactivates some policies;

[0220] (2) PCF returns a "200OK" message to SMF, which carries 2G policy information, including QoS parameters applicable to 2G.

[0221] As can be seen from the above, the solution provided by the embodiment of the present invention solves the policy control problem of 2G network access in the 2G, 4G, and 5G converged network architecture. During the 2G, 4G, and 5G interoperability process, the PCF performs policy shutdown or partial policy shutdown on the 2G network, and the SMF performs policy control based on the 2G subscription information. This avoids the session interruption caused by the unreasonable parameter mapping executed by the SMF in the existing technology, while saving N7 port signaling transmission.

[0222] The embodiment of the present invention also provides a policy control device, which is applied to a policy control function entity, such as Figure 7 Shown, including:

[0223] A first determining module 71 is configured to determine policy control information for a 2G network;

[0224] A first sending module 72 is configured to send the policy control information to a session management function SMF;

[0225] The policy control information includes first sub-information indicating policy shutdown, or second sub-information indicating part of the policy used in other networks, and the other networks include at least one of a 4G network and a 5G network.

[0226] The policy control device provided by the embodiment of the present invention determines the policy control information for the 2G network; sends the policy control information to the session management function SMF; wherein the policy control information includes a first sub-information indicating a policy shutdown, or a second sub-information indicating part of the policy used in other networks, and the other networks include at least one of a 4G network and a 5G network; it can realize the execution of policy shutdown or partial policy shutdown for the 2G network through the PCF during the 2G, 4G and 5G interoperability process, so that the SMF can execute policy control according to the 2G subscription information or the policy applicable to 2G issued by the PCF, avoiding the session interruption that may be caused by the unreasonable parameter mapping executed by the SMF in the prior art, while saving the N7 port signaling transmission; it well solves the problem that the policy control scheme for accessing the 2G network in the prior art consumes a lot of signaling and PCF performance, and even causes communication interruption.

[0227] Among them, the first sending module includes: a first sending sub-module, which is used to create a response message through a first session management policy and send the first sub-information to the SMF during the process of the terminal accessing the 4G network; or, when the terminal is in the 4G network and the session is modified, update the response message through a first session management policy and send the first sub-information to the SMF.

[0228] Furthermore, the policy control device also includes: a first receiving module, used to receive a second session management policy update request message sent by the SMF during the process of the terminal switching from the 4G network to the 2G network after sending the first sub-information to the SMF, the second session management policy update request message carrying first indication information indicating that the type of the network currently to be accessed by the terminal is a 2G network; a first feedback module, used to feedback a second session management policy update response message to the SMF based on the first indication information, the second session management policy update response message carrying second indication information indicating a refusal to issue the policy and a first reason value; wherein the first reason value indicates that the type of the network currently to be accessed by the terminal is a 2G network.

[0229] The first determining module includes: a first receiving submodule, configured to receive a preset request message sent by the SMF under preset conditions; the preset request message carries third indication information indicating that the type of the network currently to be accessed by the terminal is a 2G network; the first determining submodule, configured to determine, based on the third indication information, the first sub-information or the second sub-information for accessing the 2G network; and perform policy shutdown; the first sending module includes: a first feedback submodule, configured to feed back a preset response message to the SMF, the preset response message carrying the first sub-information or the second sub-information and a second cause value; wherein the preset condition is a case where the terminal initially accesses the 2G network or switches from the 5G network to the 2G network, the preset request message is a session management policy creation request message, and the preset response message is a session management policy creation response message; or, the preset condition is a case where the terminal switches from the 4G network to the 2G network, the preset request message is a session management policy update request message, and the preset response message is a session management policy update response message; and the second cause value indicates that the type of the network currently to be accessed by the terminal is a 2G network.

[0230] Specifically, determining the second sub-information for accessing the 2G network according to the third indication information includes: determining the second sub-information for accessing the 2G network according to the third indication information and 2G network capability information.

[0231] In an embodiment of the present invention, when the terminal initially accesses the 2G network or switches from the 5G network to the 2G network, the second sub-information includes: at least one of: public land mobile network PLMN change information, access type change, access network billing association information, identity authentication management session failure information, and wireless access technology type change information; and / or, when the terminal switches from the 4G network to the 2G network, the second sub-information includes: resource modification request information, terminal IP address change information, terminal session or resource usage reporting information, application traffic start information, application traffic end information, access network information reporting information, packet switching PS data closed state change information, default service quality QoS change information, At least one of session aggregation maximum bit rate Session-AMBR change information, QoS notification information, identity authentication reallocation information, existence area change information, service area change information, policy control re-validation timeout information, resource release notification information, resource allocation success notification information, reflective QoS information, packet filter number reporting information, terminal UE time zone change information, authentication information change information, delay-sensitive network bridge information, QoS monitoring information, cell change information, evolved packet system EPS fallback information, multi-access session information, 5G rate group joining IP multicast group information, 5G rate group leaving IP multicast group information, data network name DDN failure information, and DDN transmission status information.

[0232] Among them, the implementation embodiments of the policy control method on the policy control function entity side are all applicable to the embodiments of the policy control device and can also achieve the corresponding same technical effects.

[0233] The embodiment of the present invention also provides a policy control device, which is applied to a session management function entity, such as Figure 8 Shown, including:

[0234] The second receiving module 81 is used to receive policy control information for the 2G network sent by the policy control function PCF;

[0235] A first processing module 82 is configured to perform session management according to the policy control information when the type of the network currently to be accessed by the terminal is a 2G network;

[0236] The policy control information includes first sub-information indicating policy shutdown, or second sub-information indicating part of the policy used in other networks, and the other networks include at least one of a 4G network and a 5G network.

[0237] The policy control device provided by the embodiment of the present invention receives policy control information for the 2G network sent by the policy control function PCF; when the type of the network to be currently accessed by the terminal is a 2G network, session management is performed according to the policy control information; wherein, the policy control information includes a first sub-information indicating a policy shutdown, or a second sub-information indicating part of the policy used in other networks, and the other networks include at least one of a 4G network and a 5G network; it can realize the execution of policy shutdown or partial policy shutdown for the 2G network through PCF during the 2G, 4G and 5G interoperability process, so that the SMF can execute policy control according to the 2G subscription information or the policy applicable to 2G issued by the PCF, avoiding the session interruption that may be caused by the unreasonable parameter mapping executed by the SMF in the prior art, while saving the N7 port signaling transmission; it well solves the problem that the policy control scheme for accessing the 2G network in the prior art consumes a lot of signaling and PCF performance, and even causes communication interruption.

[0238] Among them, the second receiving module includes: a second receiving sub-module, used to receive the first sub-information sent by the PCF through a first session management policy creation response message when the terminal accesses the 4G network; or, to receive the first sub-information sent by the PCF through a first session management policy update response message when the terminal is in the 4G network and a session modification is performed.

[0239] Furthermore, the policy control device also includes: a second sending module, used to send a second session management policy update request message to the PCF after receiving the first sub-information sent by the PCF, during the process of the terminal switching from the 4G network to the 2G network, the second session management policy update request message carries first indication information indicating that the type of network currently to be accessed by the terminal is a 2G network; a third receiving module, used to receive a second session management policy update response message fed back by the PCF based on the first indication information, the second session management policy update response message carries second indication information indicating a refusal to issue the policy and a first reason value; wherein, the first reason value indicates that the type of network currently to be accessed by the terminal is a 2G network.

[0240] In an embodiment of the present invention, the policy control device further includes: a third sending module, configured to, before receiving policy control information for a 2G network sent by a policy control function (PCF), send a preset request message to the PCF under preset conditions; the preset request message carries third indication information indicating that the type of the network currently to be accessed by the terminal is a 2G network; and the second receiving module includes: a third receiving submodule, configured to receive a preset response message fed back by the PCF based on the third indication information, the preset response message carrying the first sub-information or the second sub-information, and a second cause value; wherein the preset condition is a case where the terminal initially accesses the 2G network or switches from the 5G network to the 2G network, the preset request message is a session management policy creation request message, and the preset response message is a session management policy creation response message; or, the preset condition is a case where the terminal switches from the 4G network to the 2G network, the preset request message is a session management policy update request message, and the preset response message is a session management policy update response message; and the second cause value indicates that the type of the network currently to be accessed by the terminal is a 2G network.

[0241] Among them, the first processing module includes: a first processing sub-module, which is used to perform session management according to local policy configuration information or policy subscription information obtained from a preset information storage network element when the policy control information includes the first sub-information; or, when the policy control information includes the second sub-information, perform session management according to the partial policy indicated in the second sub-information.

[0242] In an embodiment of the present invention, when the terminal initially accesses the 2G network or switches from the 5G network to the 2G network, the second sub-information includes: at least one of: public land mobile network PLMN change information, access type change, access network billing association information, identity authentication management session failure information, and wireless access technology type change information; and / or, when the terminal switches from the 4G network to the 2G network, the second sub-information includes: resource modification request information, terminal IP address change information, terminal session or resource usage reporting information, application traffic start information, application traffic end information, access network information reporting information, packet switching PS data closed state change information, default service quality QoS change information, At least one of session aggregation maximum bit rate Session-AMBR change information, QoS notification information, identity authentication reallocation information, existence area change information, service area change information, policy control re-validation timeout information, resource release notification information, resource allocation success notification information, reflective QoS information, packet filter number reporting information, terminal UE time zone change information, authentication information change information, delay-sensitive network bridge information, QoS monitoring information, cell change information, evolved packet system EPS fallback information, multi-access session information, 5G rate group joining IP multicast group information, 5G rate group leaving IP multicast group information, data network name DDN failure information, and DDN transmission status information.

[0243] Among them, the implementation embodiments of the policy control method on the session management function entity side are all applicable to the embodiments of the policy control device and can also achieve the corresponding same technical effects.

[0244] The embodiment of the present invention further provides a functional entity, which is a policy control functional entity. Figure 9 As shown, it includes: a processor 91 and a transceiver 92;

[0245] The processor 91 is configured to determine policy control information for a 2G network;

[0246] Sending the policy control information to the session management function SMF via the transceiver 92;

[0247] The policy control information includes first sub-information indicating policy shutdown, or second sub-information indicating part of the policy used in other networks, and the other networks include at least one of a 4G network and a 5G network.

[0248] The functional entity provided by the embodiment of the present invention determines the policy control information for the 2G network; sends the policy control information to the session management function SMF; wherein the policy control information includes a first sub-information indicating a policy shutdown, or a second sub-information indicating part of the policy used in other networks, and the other networks include at least one of a 4G network and a 5G network; it can realize the execution of policy shutdown or partial policy shutdown for the 2G network through the PCF during the 2G, 4G and 5G interoperability process, so that the SMF can execute policy control according to the 2G subscription information or the policy applicable to 2G issued by the PCF, avoiding the session interruption that may be caused by the unreasonable parameter mapping executed by the SMF in the prior art, while saving the N7 port signaling transmission; it well solves the problem that the policy control scheme for accessing the 2G network in the prior art consumes a lot of signaling and PCF performance, and even causes communication interruption.

[0249] The processor is specifically used to: use the transceiver to create a response message through a first session management policy when the terminal accesses the 4G network, and send the first sub-information to the SMF; or use the transceiver to update the response message through a first session management policy when the terminal is in the 4G network and the session is modified, and send the first sub-information to the SMF.

[0250] Furthermore, the processor is also used to: after sending the first sub-information to the SMF, receive through the transceiver a second session management policy update request message sent by the SMF during the process of the terminal switching from the 4G network to the 2G network, the second session management policy update request message carries first indication information indicating that the type of the network currently to be accessed by the terminal is a 2G network; based on the first indication information, feed back a second session management policy update response message to the SMF through the transceiver, the second session management policy update response message carries second indication information indicating a refusal to issue the policy and a first reason value; wherein, the first reason value indicates that the type of the network currently to be accessed by the terminal is a 2G network.

[0251] The processor is specifically configured to: receive, through the transceiver, a preset request message sent by the SMF under preset conditions; the preset request message carries third indication information indicating that the type of the network currently to be accessed by the terminal is a 2G network; determine, based on the third indication information, the first sub-information or the second sub-information for accessing the 2G network; and execute policy shutdown; the processor is specifically configured to: feedback a preset response message to the SMF through the transceiver, the preset response message carrying the first sub-information or the second sub-information, and a second cause value; wherein the preset condition is a case where the terminal initially accesses the 2G network or switches from the 5G network to the 2G network, the preset request message is a session management policy creation request message, and the preset response message is a session management policy creation response message; or, the preset condition is a case where the terminal switches from the 4G network to the 2G network, the preset request message is a session management policy update request message, and the preset response message is a session management policy update response message; the second cause value indicates that the type of the network currently to be accessed by the terminal is a 2G network.

[0252] Specifically, the processor is specifically configured to: determine the second sub-information for accessing the 2G network according to the third indication information and the 2G network capability information.

[0253] In an embodiment of the present invention, when the terminal initially accesses the 2G network or switches from the 5G network to the 2G network, the second sub-information includes: at least one of: public land mobile network PLMN change information, access type change, access network billing association information, identity authentication management session failure information, and wireless access technology type change information; and / or, when the terminal switches from the 4G network to the 2G network, the second sub-information includes: resource modification request information, terminal IP address change information, terminal session or resource usage reporting information, application traffic start information, application traffic end information, access network information reporting information, packet switching PS data closed state change information, default service quality QoS change information, At least one of session aggregation maximum bit rate Session-AMBR change information, QoS notification information, identity authentication reallocation information, existence area change information, service area change information, policy control re-validation timeout information, resource release notification information, resource allocation success notification information, reflective QoS information, packet filter number reporting information, terminal UE time zone change information, authentication information change information, delay-sensitive network bridge information, QoS monitoring information, cell change information, evolved packet system EPS fallback information, multi-access session information, 5G rate group joining IP multicast group information, 5G rate group leaving IP multicast group information, data network name DDN failure information, and DDN transmission status information.

[0254] Among them, the implementation embodiments of the policy control method on the policy control functional entity side are all applicable to the embodiments of the functional entity and can also achieve the corresponding same technical effects.

[0255] The embodiment of the present invention further provides a functional entity, which is a session management functional entity. Figure 10 As shown, it includes: a processor 101 and a transceiver 102;

[0256] The processor 101 is configured to receive, through the transceiver 102, policy control information for the 2G network sent by the policy control function PCF;

[0257] When the type of the network currently to be accessed by the terminal is a 2G network, performing session management according to the policy control information;

[0258] The policy control information includes first sub-information indicating policy shutdown, or second sub-information indicating part of the policy used in other networks, and the other networks include at least one of a 4G network and a 5G network.

[0259] The functional entity provided by the embodiment of the present invention receives policy control information for the 2G network sent by the policy control function PCF; when the type of the network to be currently accessed by the terminal is a 2G network, session management is performed according to the policy control information; wherein, the policy control information includes a first sub-information indicating a policy shutdown, or a second sub-information indicating part of the policy used in other networks, and the other networks include at least one of a 4G network and a 5G network; it can realize the execution of policy shutdown or partial policy shutdown for the 2G network through PCF during the 2G, 4G and 5G interoperability process, so that the SMF can execute policy control according to the 2G subscription information or the policy applicable to 2G issued by the PCF, avoiding the session interruption that may be caused by the unreasonable parameter mapping executed by the SMF in the prior art, while saving the N7 port signaling transmission; it well solves the problem that the policy control scheme for accessing the 2G network in the prior art consumes a lot of signaling and PCF performance, and even causes communication interruption.

[0260] The processor is specifically used to: receive, through the transceiver, the first sub-information sent by the PCF through a first session management policy creation response message when the terminal accesses the 4G network; or, receive, through the transceiver, the first sub-information sent by the PCF through a first session management policy update response message when the terminal is in the 4G network and a session modification is performed.

[0261] Furthermore, the processor is also used to: after receiving the first sub-information sent by the PCF, during the process of the terminal switching from the 4G network to the 2G network, send a second session management policy update request message to the PCF through the transceiver, the second session management policy update request message carrying first indication information indicating that the type of network currently to be accessed by the terminal is a 2G network; receive, through the transceiver, a second session management policy update response message fed back by the PCF based on the first indication information, the second session management policy update response message carrying second indication information indicating a refusal to issue the policy and a first reason value; wherein, the first reason value indicates that the type of network currently to be accessed by the terminal is a 2G network.

[0262] In an embodiment of the present invention, the processor is further configured to: before receiving policy control information for a 2G network sent by a policy control function (PCF), under preset conditions, send a preset request message to the PCF through the transceiver; the preset request message carries third indication information indicating that the type of the network currently to be accessed by the terminal is a 2G network; the processor is specifically configured to: receive, through the transceiver, a preset response message fed back by the PCF based on the third indication information, the preset response message carrying the first sub-information or the second sub-information, and a second cause value; wherein the preset condition is a case where the terminal initially accesses the 2G network or switches from the 5G network to the 2G network, the preset request message is a session management policy creation request message, and the preset response message is a session management policy creation response message; or, the preset condition is a case where the terminal switches from the 4G network to the 2G network, the preset request message is a session management policy update request message, and the preset response message is a session management policy update response message; and the second cause value indicates that the type of the network currently to be accessed by the terminal is a 2G network.

[0263] The processor is specifically used to: when the policy control information includes the first sub-information, perform session management according to local policy configuration information or policy subscription information obtained from a preset information storage network element; or, when the policy control information includes the second sub-information, perform session management according to part of the policy indicated in the second sub-information.

[0264] In an embodiment of the present invention, when the terminal initially accesses the 2G network or switches from the 5G network to the 2G network, the second sub-information includes: at least one of: public land mobile network PLMN change information, access type change, access network billing association information, identity authentication management session failure information, and wireless access technology type change information; and / or, when the terminal switches from the 4G network to the 2G network, the second sub-information includes: resource modification request information, terminal IP address change information, terminal session or resource usage reporting information, application traffic start information, application traffic end information, access network information reporting information, packet switching PS data closed state change information, default service quality QoS change information, At least one of session aggregation maximum bit rate Session-AMBR change information, QoS notification information, identity authentication reallocation information, existence area change information, service area change information, policy control re-validation timeout information, resource release notification information, resource allocation success notification information, reflective QoS information, packet filter number reporting information, terminal UE time zone change information, authentication information change information, delay-sensitive network bridge information, QoS monitoring information, cell change information, evolved packet system EPS fallback information, multi-access session information, 5G rate group joining IP multicast group information, 5G rate group leaving IP multicast group information, data network name DDN failure information, and DDN transmission status information.

[0265] Among them, the implementation embodiments of the policy control method on the session management function entity side are all applicable to the embodiments of this function entity and can achieve the same technical effects.

[0266] An embodiment of the present invention also provides a functional entity, including a memory, a processor, and a program stored on the memory and runnable on the processor; when the processor executes the program, the policy control method on the policy control functional entity side is implemented; or, when the processor executes the program, the policy control method on the session management functional entity side is implemented.

[0267] Among them, the implementation embodiments of the policy control method on the policy control function entity side or the session management function entity side are applicable to the embodiments of the functional entity and can also achieve the corresponding same technical effects.

[0268] An embodiment of the present invention also provides a readable storage medium on which a program is stored, which, when executed by a processor, implements the steps of the policy control method on the policy control function entity side; or, when executed by a processor, implements the steps of the policy control method on the session management function entity side.

[0269] Among them, the implementation embodiments of the policy control method on the policy control function entity side or the session management function entity side are all applicable to the embodiments of the readable storage medium and can also achieve the corresponding same technical effects.

[0270] It should be noted that many functional components described in this specification are referred to as modules / sub-modules in order to more particularly emphasize the independence of their implementation methods.

[0271] In the embodiment of the present invention, module / submodule can be implemented with software so that it can be executed by various types of processors. For example, an identified executable code module can include one or more physical or logical blocks of computer instructions, for example, it can be constructed as an object, process or function. Nevertheless, the executable code of the identified module does not need to be physically located together, but can include different instructions stored in different bits, which, when these instructions are logically combined together, constitute a module and realize the specified purpose of the module.

[0272] In fact, executable code module can be a single instruction or many instructions, and can even be distributed on a plurality of different code segments, distributed in the middle of different programs, and distributed across a plurality of memory devices.Similarly, operating data can be identified in the module, and can be implemented and organized in the data structure of any appropriate type according to any appropriate form.Described operating data can be collected as a single data set, or can be distributed in different locations (including on different storage devices), and can only be present on a system or network as an electronic signal at least in part.

[0273] When a module can be implemented using software, given the current state of hardware technology, those skilled in the art can build corresponding hardware circuits to implement the corresponding functions of the module, regardless of cost. The hardware circuits may include conventional very large scale integration (VLSI) circuits or gate arrays, as well as existing semiconductors such as logic chips and transistors, or other discrete components. Modules may also be implemented using programmable hardware devices, such as field programmable gate arrays, programmable array logic, or programmable logic devices.

[0274] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary personnel in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A policy control method, applied to a policy control function entity, characterized in that: include: Determine policy control information for 2G networks; Sending the policy control information to the session management function SMF; The policy control information includes first sub-information indicating policy shutdown, or second sub-information indicating partial policies used in other networks, the other networks including at least one of a 4G network and a 5G network; the partial policies are partial policies for deactivating the 2G network; The sending of the policy control information to the session management function SMF includes: During the process of the terminal accessing the 4G network, creating a response message through a first session management policy and sending the first sub-information to the SMF; or When the terminal is in the 4G network and a session modification is performed, sending the first sub-information to the SMF through a first session management policy update response message; After sending the first sub-information to the SMF, the method further includes: receiving a second session management policy update request message sent by the SMF during the process of the terminal switching from the 4G network to the 2G network, where the second session management policy update request message carries first indication information indicating that the type of the network currently to be accessed by the terminal is a 2G network; Feedback a second session management policy update response message to the SMF according to the first indication information, where the second session management policy update response message carries second indication information indicating rejection of the delivery policy and the first cause value; The first reason value indicates that the type of network the terminal is currently accessing is a 2G network.

2. The policy control method according to claim 1, characterized in that: The determining of policy control information for accessing the 2G network includes: receiving a preset request message sent by the SMF under preset conditions; the preset request message carries third indication information indicating that the type of the network currently to be accessed by the terminal is a 2G network; Determining, according to the third indication information, the first sub-information or the second sub-information for accessing the 2G network; and executing a policy shutdown; The sending the policy control information to the session management function SMF includes: Feedback a preset response message to the SMF, where the preset response message carries the first sub-information or the second sub-information and the second cause value; The preset condition is a case where the terminal initially accesses a 2G network or switches from the 5G network to a 2G network, the preset request message is a session management policy creation request message, and the preset response message is a session management policy creation response message; or, The preset condition is that the terminal switches from the 4G network to the 2G network, the preset request message is a session management policy update request message, and the preset response message is a session management policy update response message; The second reason value indicates that the type of the network currently to be accessed by the terminal is a 2G network.

3. The policy control method according to claim 2, characterized in that: The determining, according to the third indication information, the second sub-information for accessing the 2G network includes: The second sub-information for accessing the 2G network is determined according to the third indication information and the 2G network capability information.

4. The policy control method according to any one of claims 1 to 3, characterized in that: When the terminal initially accesses the 2G network or switches from the 5G network to the 2G network, the second sub-information includes: at least one of public land mobile network PLMN change information, access type change information, access network charging association information, identity authentication management session failure information, and radio access technology type change information; and / or, When the terminal switches from the 4G network to the 2G network, the second sub-information includes: resource modification request information, terminal IP address change information, terminal session or resource usage reporting information, application traffic start information, application traffic end information, access network information reporting information, packet switching PS data shutdown state change information, default quality of service QoS change information, session aggregation maximum bit rate Session-AMBR change information, QoS notification information, identity authentication reallocation information, existence area change information, service area change information, policy control re-effectiveness timeout information, resource release notification information, resource allocation success notification information, reflective QoS information, packet filter number reporting information, terminal UE time zone change information, authentication information change information, delay-sensitive network bridge information information, QoS monitoring information, cell change information, evolved packet system EPS fallback information, multi-access session information, 5G rate group join IP multicast group information, 5G rate group leave IP multicast group information, data network name DDN failure information and DDN transmission status information. At least one of the information.

5. A policy control method, applied to a session management function entity, characterized in that: include: Receive policy control information for the 2G network sent by the policy control function PCF; When the type of the network currently to be accessed by the terminal is a 2G network, performing session management according to the policy control information; The policy control information includes first sub-information indicating policy shutdown, or second sub-information indicating partial policies used in other networks, the other networks including at least one of a 4G network and a 5G network; the partial policies are partial policies for deactivating the 2G network; The receiving policy control information for the 2G network sent by the policy control function PCF includes: receiving the first sub-information sent by the PCF through a first session management policy creation response message during the process of the terminal accessing the 4G network; or receiving the first sub-information sent by the PCF through a first session management policy update response message when the terminal is in the 4G network and a session modification is performed; After receiving the first sub-information sent by the PCF, the method further includes: During the process of the terminal switching from the 4G network to the 2G network, sending a second session management policy update request message to the PCF, where the second session management policy update request message carries first indication information indicating that the type of network currently to be accessed by the terminal is a 2G network; receiving a second session management policy update response message fed back by the PCF according to the first indication information, where the second session management policy update response message carries second indication information indicating rejection of the delivery policy and the first cause value; The first reason value indicates that the type of network the terminal is currently accessing is a 2G network.

6. The policy control method according to claim 5, characterized in that: Before receiving the policy control information for the 2G network sent by the policy control function PCF, the following steps are also included: Under a preset condition, sending a preset request message to the PCF; the preset request message carries third indication information indicating that the type of the network currently to be accessed by the terminal is a 2G network; The receiving policy control information for the 2G network sent by the policy control function PCF includes: receiving a preset response message fed back by the PCF according to the third indication information, where the preset response message carries the first sub-information or the second sub-information and a second cause value; The preset condition is a case where the terminal initially accesses a 2G network or switches from the 5G network to a 2G network, the preset request message is a session management policy creation request message, and the preset response message is a session management policy creation response message; or, The preset condition is that the terminal switches from the 4G network to the 2G network, the preset request message is a session management policy update request message, and the preset response message is a session management policy update response message; The second reason value indicates that the type of the network currently to be accessed by the terminal is a 2G network.

7. The policy control method according to claim 5, characterized in that: The performing session management according to the policy control information includes: In the case where the policy control information includes the first sub-information, performing session management according to local policy configuration information or policy subscription information obtained from a preset information storage network element; or In a case where the policy control information includes the second sub-information, session management is performed according to the partial policy indicated in the second sub-information.

8. The policy control method according to any one of claims 5 to 7, characterized in that: When the terminal initially accesses the 2G network or switches from the 5G network to the 2G network, the second sub-information includes: at least one of public land mobile network PLMN change information, access type change information, access network charging association information, identity authentication management session failure information, and radio access technology type change information; and / or, When the terminal switches from the 4G network to the 2G network, the second sub-information includes: resource modification request information, terminal IP address change information, terminal session or resource usage reporting information, application traffic start information, application traffic end information, access network information reporting information, packet switching PS data shutdown state change information, default quality of service QoS change information, session aggregation maximum bit rate Session-AMBR change information, QoS notification information, identity authentication reallocation information, existence area change information, service area change information, policy control re-effectiveness timeout information, resource release notification information, resource allocation success notification information, reflective QoS information, packet filter number reporting information, terminal UE time zone change information, authentication information change information, delay-sensitive network bridge information information, QoS monitoring information, cell change information, evolved packet system EPS fallback information, multi-access session information, 5G rate group join IP multicast group information, 5G rate group leave IP multicast group information, data network name DDN failure information and DDN transmission status information. At least one of the information.

9. A policy control device, applied to a policy control function entity, characterized in that: include: A first determining module is used to determine policy control information for a 2G network; A first sending module, configured to send the policy control information to a session management function SMF; The policy control information includes first sub-information indicating policy shutdown, or second sub-information indicating partial policies used in other networks, the other networks including at least one of a 4G network and a 5G network; the partial policies are partial policies for deactivating the 2G network; The first sending module includes: A first sending submodule is configured to send the first sub-information to the SMF by creating a response message through a first session management policy during the process of the terminal accessing the 4G network; or When the terminal is in the 4G network and a session modification is performed, sending the first sub-information to the SMF through a first session management policy update response message; Wherein, the policy control device further includes: A first receiving module is configured to, after sending the first sub-information to the SMF, receive a second session management policy update request message sent by the SMF during a process in which the terminal switches from the 4G network to the 2G network, where the second session management policy update request message carries first indication information indicating that the type of the network currently to be accessed by the terminal is a 2G network; A first feedback module is configured to feed back a second session management policy update response message to the SMF according to the first indication information, where the second session management policy update response message carries second indication information indicating rejection of the delivery policy and a first reason value; The first reason value indicates that the type of network the terminal is currently accessing is a 2G network.

10. The policy control device according to claim 9, characterized in that: The first determining module includes: A first receiving submodule is configured to receive a preset request message sent by the SMF under preset conditions; the preset request message carries third indication information indicating that the type of the network currently to be accessed by the terminal is a 2G network; A first determining submodule is configured to determine the first sub-information or the second sub-information for accessing the 2G network according to the third indication information; and execute a policy shutdown; The first sending module includes: A first feedback submodule is configured to feed back a preset response message to the SMF, where the preset response message carries the first sub-information or the second sub-information and a second cause value; The preset condition is a case where the terminal initially accesses a 2G network or switches from the 5G network to a 2G network, the preset request message is a session management policy creation request message, and the preset response message is a session management policy creation response message; or, The preset condition is that the terminal switches from the 4G network to the 2G network, the preset request message is a session management policy update request message, and the preset response message is a session management policy update response message; The second reason value indicates that the type of the network currently to be accessed by the terminal is a 2G network.

11. The policy control device according to claim 10, characterized in that: The determining, according to the third indication information, the second sub-information for accessing the 2G network includes: The second sub-information for accessing the 2G network is determined according to the third indication information and the 2G network capability information.

12. The policy control device according to any one of claims 9 to 11, characterized in that: When the terminal initially accesses the 2G network or switches from the 5G network to the 2G network, the second sub-information includes: at least one of public land mobile network PLMN change information, access type change information, access network charging association information, identity authentication management session failure information, and radio access technology type change information; and / or, When the terminal switches from the 4G network to the 2G network, the second sub-information includes: resource modification request information, terminal IP address change information, terminal session or resource usage reporting information, application traffic start information, application traffic end information, access network information reporting information, packet switching PS data shutdown state change information, default quality of service QoS change information, session aggregation maximum bit rate Session-AMBR change information, QoS notification information, identity authentication reallocation information, existence area change information, service area change information, policy control re-effectiveness timeout information, resource release notification information, resource allocation success notification information, reflective QoS information, packet filter number reporting information, terminal UE time zone change information, authentication information change information, delay-sensitive network bridge information information, QoS monitoring information, cell change information, evolved packet system EPS fallback information, multi-access session information, 5G rate group join IP multicast group information, 5G rate group leave IP multicast group information, data network name DDN failure information and DDN transmission status information. At least one of the information.

13. A policy control device, applied to a session management function entity, characterized in that: include: A second receiving module is used to receive policy control information for the 2G network sent by the policy control function PCF; A first processing module is configured to perform session management according to the policy control information when the type of the network currently to be accessed by the terminal is a 2G network; The policy control information includes first sub-information indicating policy shutdown, or second sub-information indicating partial policies used in other networks, the other networks including at least one of a 4G network and a 5G network; the partial policies are partial policies for deactivating the 2G network; The second receiving module includes: A second receiving submodule is configured to receive the first sub-information sent by the PCF through a first session management policy creation response message during the process of the terminal accessing the 4G network; or receiving the first sub-information sent by the PCF through a first session management policy update response message when the terminal is in the 4G network and a session modification is performed; Wherein, the policy control device further includes: a second sending module, configured to, after receiving the first sub-information sent by the PCF, send a second session management policy update request message to the PCF during a process in which the terminal switches from the 4G network to the 2G network, where the second session management policy update request message carries first indication information indicating that the type of network currently to be accessed by the terminal is a 2G network; A third receiving module is configured to receive a second session management policy update response message fed back by the PCF according to the first indication information, where the second session management policy update response message carries second indication information indicating rejection of the delivery policy and a first cause value; The first reason value indicates that the type of network the terminal is currently accessing is a 2G network.

14. The policy control device according to claim 13, characterized in that: Also includes: The third sending module is used to send a preset request message to the PCF under a preset condition before receiving the policy control information for the 2G network sent by the policy control function PCF; The preset request message carries third indication information indicating that the type of the network currently to be accessed by the terminal is a 2G network; The second receiving module includes: a third receiving submodule, configured to receive a preset response message fed back by the PCF according to the third indication information, where the preset response message carries the first sub-information or the second sub-information, and a second cause value; The preset condition is a case where the terminal initially accesses a 2G network or switches from the 5G network to a 2G network, the preset request message is a session management policy creation request message, and the preset response message is a session management policy creation response message; or, The preset condition is that the terminal switches from the 4G network to the 2G network, the preset request message is a session management policy update request message, and the preset response message is a session management policy update response message; The second reason value indicates that the type of the network currently to be accessed by the terminal is a 2G network.

15. The policy control device according to claim 13, characterized in that: The first processing module includes: a first processing submodule configured to perform session management according to local policy configuration information or policy subscription information obtained from a preset information storage network element when the policy control information includes the first sub-information; or In a case where the policy control information includes the second sub-information, session management is performed according to the partial policy indicated in the second sub-information.

16. The policy control device according to any one of claims 13 to 15, characterized in that: When the terminal initially accesses the 2G network or switches from the 5G network to the 2G network, the second sub-information includes: at least one of public land mobile network PLMN change information, access type change information, access network charging association information, identity authentication management session failure information, and radio access technology type change information; and / or, When the terminal switches from the 4G network to the 2G network, the second sub-information includes: resource modification request information, terminal IP address change information, terminal session or resource usage reporting information, application traffic start information, application traffic end information, access network information reporting information, packet switching PS data shutdown state change information, default quality of service QoS change information, session aggregation maximum bit rate Session-AMBR change information, QoS notification information, identity authentication reallocation information, existence area change information, service area change information, policy control re-effectiveness timeout information, resource release notification information, resource allocation success notification information, reflective QoS information, packet filter number reporting information, terminal UE time zone change information, authentication information change information, delay-sensitive network bridge information information, QoS monitoring information, cell change information, evolved packet system EPS fallback information, multi-access session information, 5G rate group join IP multicast group information, 5G rate group leave IP multicast group information, data network name DDN failure information and DDN transmission status information. At least one of the information.

17. A functional entity, which is a policy control functional entity, characterized in that: include: processor and transceiver; The processor is configured to determine policy control information for a 2G network; Sending the policy control information to the session management function SMF via the transceiver; The policy control information includes first sub-information indicating policy shutdown, or second sub-information indicating partial policies used in other networks, the other networks including at least one of a 4G network and a 5G network; the partial policies are partial policies for deactivating the 2G network; The processor is specifically configured to: Using the transceiver, during the process of the terminal accessing the 4G network, creating a response message through a first session management policy and sending the first sub-information to the SMF; or, Using the transceiver, when the terminal is in the 4G network and a session modification is performed, sending the first sub-information to the SMF through a first session management policy update response message; The processor is further configured to: After sending the first sub-information to the SMF, receiving, through the transceiver, a second session management policy update request message sent by the SMF during the process of the terminal switching from the 4G network to the 2G network, where the second session management policy update request message carries first indication information indicating that the type of the network currently to be accessed by the terminal is a 2G network; Feedback a second session management policy update response message to the SMF through the transceiver according to the first indication information, where the second session management policy update response message carries second indication information indicating rejection of the delivery policy and a first cause value; The first reason value indicates that the type of network the terminal is currently accessing is a 2G network.

18. A functional entity, wherein the functional entity is a session management functional entity, characterized in that: include: processor and transceiver; The processor is configured to receive, through the transceiver, policy control information for the 2G network sent by the policy control function PCF; When the type of the network currently to be accessed by the terminal is a 2G network, performing session management according to the policy control information; The policy control information includes first sub-information indicating policy shutdown, or second sub-information indicating partial policies used in other networks, the other networks including at least one of a 4G network and a 5G network; the partial policies are partial policies for deactivating the 2G network; The processor is specifically configured to: Receiving, by the transceiver, the first sub-information sent by the PCF through a first session management policy creation response message during the process of the terminal accessing the 4G network; or receiving, by the transceiver, the first sub-information sent by the PCF through a first session management policy update response message when the terminal is in the 4G network and a session modification is performed; The processor is further configured to: After receiving the first sub-information sent by the PCF, during a process in which the terminal switches from the 4G network to the 2G network, sending a second session management policy update request message to the PCF through the transceiver, where the second session management policy update request message carries first indication information indicating that the type of network currently to be accessed by the terminal is a 2G network; receiving, by the transceiver, a second session management policy update response message fed back by the PCF according to the first indication information, wherein the second session management policy update response message carries second indication information indicating rejection of the delivery policy and a first cause value; The first reason value indicates that the type of network the terminal is currently accessing is a 2G network.

19. A functional entity comprising a memory, a processor, and a program stored in the memory and executable on the processor; characterized in that: When the processor executes the program, the policy control method according to any one of claims 1 to 4 is implemented; or When the processor executes the program, the policy control method according to any one of claims 5 to 8 is implemented.

20. A readable storage medium having a program stored thereon, characterized in that: When the program is executed by a processor, the steps of the policy control method according to any one of claims 1 to 4 are implemented; or When the program is executed by a processor, the steps of the policy control method according to any one of claims 5 to 8 are implemented.

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