CN114513858A - A policy control method, device and functional entity - Google Patents

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 The first sub-information indicating policy shutdown, or the second sub-information indicating partial policies used in other networks, where the other networks include at least one of a 4G network and a 5G network. This solution can realize the process of 2G, 4G and 5G interoperability, and implement policy shutdown or partial policy shutdown for 2G network through PCF, so that SMF can execute policy control according to 2G subscription information or policies applicable to 2G issued by PCF. It avoids the session interruption that may be caused by the unreasonable parameter mapping performed by the SMF in the prior art, and saves the N7 port signaling transmission at the same time. PCF performance and even cause communication interruption problems.

Description

A policy control method, device and functional entity

technical field

The present invention relates to the field of communication technologies, and in particular, to a policy control method, device and functional entity.

Background technique

In the prior art, when a terminal initially accesses a 2G network or switches to 2G from other networks (such as 4G or 5G), 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 strategy are all 5G QoS (Quality of Service) parameters, and SMF finally maps the 5G QoS parameters into 2G QoS parameters through 4G QoS parameters. In this method, when the terminal switches to the 2G network, the Npcf_SMPolicyControl_Update (that is, the session management policy control update) service is called, and the PCF issues a policy, which may contain unnecessary policy information and triggers (events) for 2G, which consumes a lot of signaling and PCF performance, for example, 2G does not support dedicated load, PCF only needs to issue default rules when issuing policies; in addition, in the current technology, SMF performs the mapping of 5G QoS parameters to 2G QoS parameters, and the 5G QoS parameters and mapping rules are not properly configured Communication may be interrupted. For example, when the 5G-compatible Session (session)-AMBR (aggregated maximum bit rate) is mapped to 2G AMBR, the 2G network capacity may exceed the capacity of the 2G network. If the AMBR value sent exceeds the limit, the session will be rejected directly.

As can be seen from the above, the policy control scheme for accessing a 2G network in the prior art has the problem of consuming a large amount of signaling and PCF performance, and even causing communication interruption.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a policy control method, device and functional entity to solve the problem of consuming a lot of signaling and PCF performance and even causing communication interruption in the prior art policy control scheme for accessing a 2G network.

In order to solve the above technical problem, an embodiment of the present invention provides a policy control method, which is applied to a policy control functional entity, including:

Determine the policy control information for the 2G network;

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, where the other networks include at least one of a 4G network and a 5G network.

Optionally, the sending the policy control information to the session management function SMF includes:

During the process of the terminal accessing the 4G network, a response message is created through the first session management policy, and the first sub-information is sent to the SMF; or,

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

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

Receive a second session management policy update request message sent by the SMF in the process of switching the terminal from the 4G network to the 2G network, where the second session management policy update request message carries a message indicating that the terminal is currently waiting. The type of the access network is the first indication information of the 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 refusal to issue the policy and a first reason value ;

The first cause value indicates that the type of the network to be accessed by the terminal currently is a 2G network.

Optionally, the determining the 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 to be accessed by the terminal currently is a 2G network;

According to the third indication information, determine the first sub-information or the second sub-information for accessing the 2G network; and execute policy shutdown;

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

Feeding 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;

Wherein, the preset condition is a situation of the terminal initially accessing a 2G network or a situation of switching 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 creates a response message for the session management policy; or,

The preset condition is that the terminal is switched 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.

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

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

Optionally, when the terminal initially accesses the 2G network or is switched 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 at least one of charging association information, identity authentication management session failure information, and radio access technology type change information; and/or,

When the terminal is switched 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 use resource reporting information, application traffic start information, and application traffic end information , access network information reporting information, packet-switched 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 reassignment information, and presence area change information , service area change information, policy control revalidation timeout information, resource release notification information, resource allocation success notification information, reflection QoS information, packet filter number reporting information, terminal UE time zone change information, authentication and 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 joining IP multicast group information, 5G rate group leaving IP multicast group information , at least one of data network name DDN failure information and DDN transmission status information.

The embodiment of the present invention also provides a policy control method, which is applied to a session management functional entity, including:

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

When the type of the network to be accessed by the terminal currently is a 2G network, perform 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, where the other networks include at least one of a 4G network and a 5G network.

Optionally, 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 by creating a response message through the first session management policy 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.

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

In the process of switching the terminal from the 4G network to the 2G network, a second session management policy update request message is sent to the PCF, where the second session management policy update request message carries a message indicating that the terminal is currently waiting The type of network access is the first indication information of the 2G network;

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 refusal to issue the policy and a first reason value ;

The first cause value indicates that the type of the network to be accessed by the terminal currently is a 2G network.

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

Under preset conditions, send a preset request message to the PCF; the preset request message carries third indication information indicating that the type of the network to be accessed by the terminal currently is a 2G network;

The policy control information for the 2G network sent by the policy control function PCF, including:

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;

Wherein, the preset condition is a situation of the terminal initially accessing a 2G network or a situation of switching 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 creates a response message for the session management policy; or,

The preset condition is that the terminal is switched 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.

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

In the case that the policy control information includes the first sub-information, session management is performed according to the local policy configuration information or the policy subscription information obtained from the preset information storage network element; or,

When the policy control information includes the second sub-information, session management is performed according to the partial policy indicated in the second sub-information.

Optionally, when the terminal initially accesses the 2G network or is switched 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 at least one of charging association information, identity authentication management session failure information, and radio access technology type change information; and/or,

When the terminal is switched 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 use resource reporting information, application traffic start information, and application traffic end information , access network information reporting information, packet-switched 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 reassignment information, and presence area change information , service area change information, policy control revalidation timeout information, resource release notification information, resource allocation success notification information, reflection QoS information, packet filter number reporting information, terminal UE time zone change information, authentication and 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 joining IP multicast group information, 5G rate group leaving IP multicast group information , at least one of data network name DDN failure information and DDN transmission status information.

The embodiment of the present invention also provides a policy control device, which is applied to a policy control functional entity, including:

a first determining module, configured to determine policy control information for the 2G network;

a first sending module, configured to send 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, where the other networks include at least one of a 4G network and a 5G network.

Optionally, the first sending module includes:

a first sending sub-module, configured to create a response message through a first session management policy during the process of the terminal accessing the 4G network, and send the first sub-information to the SMF; or,

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

Optionally, also include:

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

a first feedback module, 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 a second message indicating refusal to issue a policy indication information and first cause value;

The first cause value indicates that the type of the network to be accessed by the terminal currently is a 2G network.

Optionally, the first determining module includes:

a first receiving sub-module, 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 to be accessed by the terminal currently is a 2G network;

a first determination sub-module, configured to determine the first sub-information or the second sub-information for accessing the 2G network according to the third indication information; and perform policy shutdown;

The first sending module includes:

a first feedback sub-module, 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;

Wherein, the preset condition is a situation of the terminal initially accessing a 2G network or a situation of switching 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 creates a response message for the session management policy; or,

The preset condition is that the terminal is switched 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.

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

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

Optionally, when the terminal initially accesses the 2G network or is switched 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 at least one of charging association information, identity authentication management session failure information, and radio access technology type change information; and/or,

When the terminal is switched 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 use resource reporting information, application traffic start information, and application traffic end information , access network information reporting information, packet-switched 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 reassignment information, and presence area change information , service area change information, policy control revalidation timeout information, resource release notification information, resource allocation success notification information, reflection QoS information, packet filter number reporting information, terminal UE time zone change information, authentication and 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 joining IP multicast group information, 5G rate group leaving IP multicast group information , at least one of data network name DDN failure information and DDN transmission status information.

The embodiment of the present invention also provides a policy control device, which is applied to a session management functional entity, including:

A second receiving module, configured to receive policy control information for the 2G network sent by the policy control function PCF;

a first processing module, configured to perform session management according to the policy control information when the type of the network to be accessed by the terminal currently 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, where the other networks include at least one of a 4G network and a 5G network.

Optionally, the second receiving module includes:

The second receiving sub-module is configured to receive the first sub-information sent by the PCF by creating a response message through the first session management policy 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.

Optionally, also include:

A second sending module, configured to send a second session management policy update to the PCF in the process of switching the terminal from the 4G network to the 2G network after receiving the first sub-information sent by the PCF a request message, 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 third receiving module, 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 a second session management policy update response message indicating refusal to issue a policy indication information and first cause value;

The first cause value indicates that the type of the network to be accessed by the terminal currently is a 2G network.

Optionally, also include:

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

The second receiving module includes:

A third receiving sub-module, 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 the second sub-information reason value;

Wherein, the preset condition is a situation of the terminal initially accessing a 2G network or a situation of switching 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 creates a response message for the session management policy; or,

The preset condition is that the terminal is switched 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.

Optionally, 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 subinformation; or,

When the policy control information includes the second sub-information, session management is performed according to the partial policy indicated in the second sub-information.

Optionally, when the terminal initially accesses the 2G network or is switched 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 at least one of charging association information, identity authentication management session failure information, and radio access technology type change information; and/or,

When the terminal is switched 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 use resource reporting information, application traffic start information, and application traffic end information , access network information reporting information, packet-switched 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 reassignment information, and presence area change information , service area change information, policy control revalidation timeout information, resource release notification information, resource allocation success notification information, reflection QoS information, packet filter number reporting information, terminal UE time zone change information, authentication and 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 joining IP multicast group information, 5G rate group leaving IP multicast group information , at least one of data network name DDN failure information and DDN transmission status information.

The embodiment of the present invention also provides a functional entity, the functional entity is a policy control functional entity, including: a processor and a transceiver;

the processor, configured to determine policy control information for the 2G network;

sending the policy control information to the session management function SMF through the transceiver;

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

Optionally, the processor is specifically used for:

Using the transceiver, when the terminal accesses the 4G network, a response message is created through a first session management policy, and the first sub-information is sent to the SMF; or,

When the terminal is in the 4G network and the session is modified by using the transceiver, the first sub-information is sent to the SMF through a first session management policy update response message.

Optionally, the processor is also used for:

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 switching the terminal 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 to be accessed by the terminal currently is a 2G network;

According to the first indication information, the transceiver feeds back a second session management policy update response message to the SMF, where the second session management policy update response message carries second indication information indicating refusal to issue a policy and the first cause value;

The first cause value indicates that the type of the network to be accessed by the terminal currently is a 2G network.

Optionally, the processor is specifically used for:

Receive, 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;

According to the third indication information, determine the first sub-information or the second sub-information for accessing the 2G network; and execute policy shutdown;

The processor is specifically used for:

Feeding back 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 a second cause value;

Wherein, the preset condition is a situation of the terminal initially accessing a 2G network or a situation of switching 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 creates a response message for the session management policy; or,

The preset condition is that the terminal is switched 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.

Optionally, the processor is specifically used for:

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

Optionally, when the terminal initially accesses the 2G network or is switched 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 at least one of charging association information, identity authentication management session failure information, and radio access technology type change information; and/or,

When the terminal is switched 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 use resource reporting information, application traffic start information, and application traffic end information , access network information reporting information, packet-switched 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 reassignment information, and presence area change information , service area change information, policy control revalidation timeout information, resource release notification information, resource allocation success notification information, reflection QoS information, packet filter number reporting information, terminal UE time zone change information, authentication and 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 joining IP multicast group information, 5G rate group leaving IP multicast group information , at least one of data network name DDN failure information and DDN transmission status information.

The embodiment of the present invention also provides a functional entity, where the functional entity is a session management functional entity, including: a processor and a transceiver;

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

When the type of the network to be accessed by the terminal currently is a 2G network, perform 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, where the other networks include at least one of a 4G network and a 5G network.

Optionally, the processor is specifically used for:

Receive, by the transceiver, the first sub-information sent by the PCF using the first session management policy to create a response message when the terminal accesses the 4G network; or,

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

Optionally, the processor is also used for:

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

Receive, through the transceiver, 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 refusal to issue a policy and the first cause value;

The first cause value indicates that the type of the network to be accessed by the terminal currently is a 2G network.

Optionally, the processor is also used for:

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

The processor is specifically used for:

receiving, by 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;

Wherein, the preset condition is a situation of the terminal initially accessing a 2G network or a situation of switching 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 creates a response message for the session management policy; or,

The preset condition is that the terminal is switched 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.

Optionally, the processor is specifically used for:

In the case that the policy control information includes the first sub-information, session management is performed according to the local policy configuration information or the policy subscription information obtained from the preset information storage network element; or,

When the policy control information includes the second sub-information, session management is performed according to the partial policy indicated in the second sub-information.

Optionally, when the terminal initially accesses the 2G network or is switched 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 at least one of charging association information, identity authentication management session failure information, and radio access technology type change information; and/or,

When the terminal is switched 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 use resource reporting information, application traffic start information, and application traffic end information , access network information reporting information, packet-switched 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 reassignment information, and presence area change information , service area change information, policy control revalidation timeout information, resource release notification information, resource allocation success notification information, reflection QoS information, packet filter number reporting information, terminal UE time zone change information, authentication and 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 joining IP multicast group information, 5G rate group leaving IP multicast group information , at least one of data network name DDN failure information and DDN transmission status information.

An embodiment of the present invention further provides a functional entity, including a memory, a processor, and a program stored on the memory and running on the processor; the processor implements the above-mentioned policy control function when executing the program A policy control method on the entity side; or, when the processor executes the program, the above-mentioned policy control method on the entity side of the session management function is implemented.

An embodiment of the present invention further provides a readable storage medium, on which a program is stored, and when the program is executed by the processor, implements the steps in the policy control method on the entity side of the policy control function; or, the program is executed by the processor At the same time, the steps in the policy control method on the entity side of the session management function are implemented.

The beneficial effects of the above-mentioned technical solutions of the present invention are as follows:

In the above solution, 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 first sub-information indicating policy shutdown, Or the second sub-information indicating part of the policies used in other networks, the other networks including at least one of 4G networks and 5G networks; in the process of enabling 2G, 4G and 5G interoperability, the PCF is used to implement policies for the 2G network Shutdown or partial policy shutdown enables SMF to execute policy control according to 2G subscription information or policies applicable to 2G issued by PCF, which avoids session interruption that may be caused by unreasonable parameter mapping performed by SMF in the prior art, and saves money at the same time. N7 port signaling transmission; it solves the problem of consuming a lot of signaling and PCF performance and even causing communication interruption in the strategy control scheme for accessing 2G network in the prior art.

Description of drawings

FIG. 1 is a schematic flowchart 1 of a policy control method according to an embodiment of the present invention;

FIG. 2 is a second schematic flowchart of a policy control method according to an embodiment of the present invention;

3 is a schematic diagram 1 of a session management policy connection establishment process according to an embodiment of the present invention;

4 is a schematic diagram 1 of a session management policy update process according to an embodiment of the present invention;

FIG. 5 is a second schematic diagram of a session management policy update process according to an embodiment of the present invention;

6 is a schematic diagram 2 of a session management policy connection establishment process according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram 1 of a strategy control apparatus according to an embodiment of the present invention;

FIG. 8 is a second schematic structural diagram of a strategy control apparatus according to an embodiment of the present invention;

FIG. 9 is a schematic diagram 1 of a functional entity structure according to an embodiment of the present invention;

FIG. 10 is a second schematic diagram of a functional entity structure according to an embodiment of the present invention.

Detailed ways

In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, the following will be described in detail with reference to the accompanying drawings and specific embodiments.

Aiming at the problem of consuming a lot of signaling and PCF performance and even causing communication interruption in the policy control scheme for accessing a 2G network in the prior art, the present invention provides a policy control method, which is applied to a policy control functional entity, as shown in FIG. 1 . display, including:

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

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

Some of the strategies are determined according to 2G capabilities and match with 2G subscription information.

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 subsection indicating policy shutdown. information, or second sub-information indicating part of the policy used in other networks, including at least one of 4G networks and 5G networks; in the process of enabling 2G, 4G and 5G interoperability, the PCF is used for 2G networks. Execution policy shutdown or partial policy shutdown enables SMF to execute policy control according to 2G subscription information or policies applicable to 2G issued by PCF, avoiding session interruption that may be caused by SMF performing unreasonable parameter mapping in the prior art, At the same time, the N7 port signaling transmission is saved; the problem of consuming a large amount of signaling and PCF performance in the strategy control scheme for accessing the 2G network in the prior art, and even causing communication interruption, is well solved. The policies applicable to 2G issued by PCF can be issued directly or indirectly. In order to deliver the deactivation event (it can also be understood that the delivered information is the strategy to be activated, and the SMF can obtain the strategy applicable to 2G accordingly).

Wherein, the sending the policy control information to the session management function SMF includes: in 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 performs session modification, sending the first sub-information to the SMF through a first session management policy update response message.

Further, after sending the first sub-information to the SMF, the method further includes: receiving a second session management policy update request sent by the SMF in the process of switching the terminal from the 4G network to the 2G network message, the second session management policy update request message carries first indication information indicating that the type of the network to be accessed by the terminal currently is a 2G network; according to the first indication information, the second session management policy update request message is fed back to the SMF. A session management policy update response message, where the second session management policy update response message carries second indication information indicating refusal to issue a policy and a first cause value; wherein the first cause value indicates that the terminal is currently waiting The type of the access network is a 2G network.

Wherein, the determining the 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 an indication of the type of the network currently to be accessed by the terminal is the third indication information of the 2G network; according to the third indication information, determine the first sub-information or the second sub-information for accessing the 2G network; and execute policy shutdown; Sending to the session management function SMF includes: feeding back a preset response message to the SMF, where the preset response message carries the first sub-information or the second sub-information (that is, the message carries the partially disabled or enabled strategy), and a second reason value; wherein, the preset condition is the situation of the terminal initially accessing the 2G network or the situation of switching from the 5G network to the 2G network, and the preset request message is a session management strategy Create a request message, where the preset response message is a session management policy creation response message; or, the preset condition is a situation in which the terminal is switched from the 4G network to the 2G network, and the preset request message is session management A policy update request message, where the preset response message is a session management policy update response message; the second reason value indicates that the type of the network to be accessed by the terminal currently is a 2G network.

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

In the embodiment of the present invention, when the terminal initially accesses the 2G network or is switched from the 5G network to the 2G network, the second sub-information includes: public land mobile network PLMN change information, access type change, access type change at least one of incoming network charging association information, identity authentication management session failure information, and radio access technology type change information (specifically, may correspond to an activation event); and/or, the case where the terminal is switched 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 use resource reporting information, application traffic start information, application traffic end information, access network information reporting information, packet-switched PS data Close state change information, default quality of service QoS change information, session aggregation maximum bit rate Session-AMBR change information, QoS notification information, identity authentication reassignment information, existence area change information, service area change information, policy control revalidation 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 and 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 joining IP multicast group information, 5G rate group leaving IP multicast group information, data network name DDN failure information and DDN transmission status information At least one of (specifically, may correspond to a deactivation event).

An embodiment of the present invention also provides a policy control method, which is applied to a session management functional entity, as shown in FIG. 2 , including:

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

Step 22: In the case that the type of the network to be accessed by the terminal currently is a 2G network, session management is performed according to the policy control information; wherein the policy control information includes the first sub-information indicating policy shutdown, or other instructions. The second sub-information of the partial policy used in the network, the other network including at least one of a 4G network and a 5G network.

The policy control method provided by the embodiment of the present invention receives the policy control information for the 2G network sent by the policy control function PCF; when the type of the network to be accessed by the terminal currently is the 2G network, the process is performed according to the policy control information. Session management; wherein the policy control information includes first sub-information indicating policy shutdown, or second sub-information indicating part of policies used in other networks, where the other networks include at least one of 4G networks and 5G networks One; in the process of realizing 2G, 4G and 5G interoperability, the PCF can implement 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 policies applicable to 2G issued by the PCF, It avoids the session interruption that may be caused by the unreasonable parameter mapping performed by the SMF in the prior art, and saves the N7 port signaling transmission at the same time. PCF performance and even cause communication interruption problems. The policies applicable to 2G issued by PCF can be issued directly or indirectly. In order to deliver the deactivation event (it can also be understood that the delivered information is the strategy to be activated, and the SMF can obtain the strategy applicable to 2G accordingly).

The receiving the policy control information for the 2G network sent by the policy control function PCF includes: receiving, during the process of the terminal accessing the 4G network, the PCF creates a response message through the first session management policy, and the sent or 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 the session is modified.

Further, after receiving the first sub-information sent by the PCF, the method further includes: in the process of switching the terminal from the 4G network to the 2G network, sending a second session management policy update request to the PCF message, the second session management policy update request message carries the first indication information indicating that the type of the network to be accessed by the terminal is a 2G network; the second indication information fed back by the PCF according to the first indication information is received; A session management policy update response message, where the second session management policy update response message carries second indication information indicating refusal to issue a policy and a first cause value; wherein the first cause value indicates that the terminal is currently waiting The type of the access network is a 2G network.

In the 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: under a preset condition, sending a preset request message to the PCF; the preset request message carries There is third indication information indicating that the type of the network to be accessed by the terminal is a 2G network; the receiving the policy control information for the 2G network sent by the policy control function PCF includes: receiving feedback from the PCF according to the third indication information The preset response message, the preset response message carries the first sub-information or the second sub-information (that is, the message carries a partial shutdown or activation policy), and the second reason value; wherein, the The preset condition is that the terminal initially accesses the 2G network or is switched 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 session management Policy creation response message; or, the preset condition is a situation in which the terminal is switched 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 A management policy update response message; the second cause value indicates that the type of the network to be accessed by the terminal currently is a 2G network.

The performing session management according to the policy control information includes: in the case that the policy control information includes the first sub-information, storing the policy subscription obtained from the network element according to local policy configuration information or preset information information to perform session management; or, in the case that the policy control information includes the second sub-information, session management is performed according to a part of the policy indicated in the second sub-information. The indicated part of the strategy 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 deactivated policy), which is not limited here.

The local policy configuration information and the acquired policy subscription information respectively match 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 platform UDM; the policy subscription information may include QOS parameter information.

In the embodiment of the present invention, when the terminal initially accesses the 2G network or is switched from the 5G network to the 2G network, the second sub-information includes: public land mobile network PLMN change information, access type change, access type change at least one of incoming network charging association information, identity authentication management session failure information, and radio access technology type change information (specifically, may correspond to an activation event); and/or, the case where the terminal is switched 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 use resource reporting information, application traffic start information, application traffic end information, access network information reporting information, packet-switched PS data Close state change information, default quality of service QoS change information, session aggregation maximum bit rate Session-AMBR change information, QoS notification information, identity authentication reassignment information, existence area change information, service area change information, policy control revalidation 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 and 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 joining IP multicast group information, 5G rate group leaving IP multicast group information, data network name DDN failure information and DDN transmission status information At least one of (specifically, may correspond to a deactivation event).

The policy control method provided by the embodiment of the present invention will be further described below with reference to multiple sides such as a policy control functional entity and a session management functional entity.

In view of the above technical problems, embodiments of the present invention provide a policy control method, which can be specifically implemented as a method for executing policy shutdown or partial policy shutdown through PCF, which involves: in the 2G, 4G and 5G fusion architecture, if the terminal By 2G access (it can be initial access or handover access), PCF executes policy shutdown or partial policy shutdown. If the PCF policy is shut down, the SMF performs policy control based on the local configuration (that is, the above-mentioned local policy configuration information) or the subscription information (that is, the above-mentioned policy subscription information, also referred to as the subscription policy information). The SMF is executed according to the policy issued by the PCF (ie, the partial policy indicated in the second sub-information above).

The solutions provided by the embodiments of the present invention involve the following three types:

The first is that the PCF pre-issues an instruction to shut down the 2G policy (corresponding to the above-mentioned case of sending the first sub-information through the first session management policy creation response message or the first session management policy update response message), and the terminal switches to the 2G network After that, 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, and the PCF executes the policy to shut down; the subscription information can be the use of the home subscription user server HSS or unified Obtained from the data management platform UDM;

Second, for the case where the terminal initially accesses 2G, or switches from 4G or 5G to 2G, PCF executes policy shutdown for the "GERA (ie 2G)" access network type, and the message returned to SMF does not carry policy information , carrying the cause value to indicate that the current PCF is in a policy shutdown state (that is, the above-mentioned feedback preset response message, which carries the first sub-information), and the SMF manages the session according to the local configuration or subscription information;

Third, for the initial access of the terminal to 2G, or switching from 4G or 5G to 2G, the PCF issues a policy to the "GERA" access type, and deactivates some of the policies used in 4G or 5G in the policy (that is, the above feedback A preset response message, which carries the second sub-information), the SMF performs the session management function according to the policy issued by the PCF. This solution is applicable to the scenario where the operator requires that the policy must be decided and issued by the PCF. The part of the strategy may be determined according to the 2G capability.

The solutions provided by the embodiments of the present invention are illustrated below with examples.

Example 1 (corresponding to the first solution above):

The terminal accesses 4G. During the session establishment (as shown in Figure 3) or the update process (as shown in Figure 4), the PCF sends a policy to the SMF. A policy shutdown is performed, and the SMF manages the session based on local configuration or subscription information, and notifies the PCF. FIG. 3 can be understood as a process of establishing an SM Policy (session management policy) connection between the SMF and the PCF, and FIG. 4 can be understood as a process of updating a policy related to session management.

1. Do the following 1a or 1b:

1a. The terminal is connected to 4G. During the session establishment process, the Npcf_SMPolicyControl_Create (session management policy creation) service can be called. The process is shown in Figure 3. The SMF can send a POST request to the PCF. Response message, corresponding to the above-mentioned first session management policy creation response message)", the message body may include PCC (policy and charging control) policy and Triggers (events) that trigger policy update, wherein the PCC policy includes 2G access The time policy, that is, an indication parameter, indicates that the PCF implements policy shutdown for the 2G network, and the SMF manages the session according to the local configuration or subscription information; the session establishment is carried out during the 4G access process.

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

2. The terminal accesses 2G (specifically, in the process of switching from 4G to 2G), the SMF performs session management based on the local configuration or subscription information, and calls the service Npcf_SMPolicyControl_Update (corresponding to the above-mentioned second session management policy update request message) to report to the PCF, As shown in Figure 5, the message body may include SMPolicyUpdateContextData (session management policy update context data), which carries "RAT_TY_CH (radio access technology type change)" and "ratType (radio access technology type)" parameters, and the parameter value is 2G wireless access type "GERA"; the PCF identifies the 2G information and returns a Response message (that is, the second session management policy update response message), which indicates that the PCF refuses to issue the policy, such as "403Forbidden", which carries the reason value (that is, The above-mentioned first cause value) indicates that the current terminal is accessed by 2G, such as "GERA". Operation 2 may inform the PCF terminal of the current policy state. FIG. 5 can be understood as a process of updating session management related policies when accessing 2G.

Example 2 (corresponding to the second scheme above):

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. Carrying the cause value indicates that the current PCF is in a policy shutdown state, and the SMF manages the session according to the local configuration or subscription information.

1. Do the following 1a or 1b:

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

1b. In the process of switching the terminal from 4G to 2G, the Npcf_SMPolicyControl_Update (corresponding to the above preset request message) service is called. The process is shown in Figure 6, but the specific content (such as the specific value used) contained in the POST message and the Response message may be different. The SMF can send a message with a message format of POST to the PCF to request to update the SMPolicy, which carries the "RAT_TY_CH" and "ratType" parameters, and the parameter value is the 2G wireless access type "GERA"; the PCF recognizes the 2G information, executes the policy to shut down, and returns 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 the cause value to indicate that the current terminal is accessed by 2G, such as "GERA" (corresponding to the above-mentioned preset response message in the carrying the first sub-information and the second cause value).

2. After receiving the Response message, the SMF manages the session based on the local configuration or subscription information.

Example 3 (corresponding to the third scheme above):

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 makes a policy decision to deactivate the 4G network. Or some of the policies used in 5G, and deliver them to the SMF, and the SMF executes the policies according to the policies delivered by the PCF.

1. Do the following 1a or 1b:

1a. When the terminal initially accesses 2G or switches from 5G to 2G (it can also be understood as the 2G access process), the SMF interacts with the PCF to establish an SM Policy connection, as shown in Figure 3, but the POST message and the "201 Created" message The content contained in it is different. Specifically, the SMF can send a message with a message format of POST (that is, the above-mentioned preset request message), which carries the 2G wireless access type information "GERA", and the PCF delivers the 2G policy (corresponding to the above-mentioned preset response message carried in the The second sub-information and the second reason value described above), wherein the PCC rule only includes the default rule, and the QoS parameter is a parameter suitable for 2G, and the subscribed Trigger list can be shown in Table 1.

Table 1 Trigger list subscribed by PCF during 2G access

1b. In the process of switching the terminal from 4G to 2G, the Npcf_SMPolicyControl_Update (corresponding to the above preset request message) service is called. The process is shown in Figure 4, but the content contained in the POST message and the "200OK" message are different. Specifically, the SMF can send a message with a message format of POST to the PCF to request to update 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 and makes policy decisions , returns "200OK (that is, 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 reason value), and the PCC rule only contains the default rule , and the QoS parameter is a parameter suitable for 2G, and the list of deactivated Triggers can be shown in Table 2.

Table 2 Trigger list for PCF deactivation during 2G access

2. The SMF manages the session based on the received policy.

As can be seen from the above, the solution provided by the embodiment of the present invention involves:

1. The PCF issues a policy in advance, instructing the execution of policy shutdown for the 2G network, specifically:

(1) The policy sent by the PCF to the SMF during non-2G access includes an indication parameter, which indicates that when the terminal is accessed by 2G, the PCF executes the policy to shut down;

(2) SMF identifies the 2G access type, performs policy control according to the local configuration or subscription information, and sends the POST message to the PCF that contains the information element of the access network type, and its value is the 2G type "GERA";

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

2. After identifying the "GERA" access network type, the PCF executes the policy shutdown, and sends an instruction to notify the SMF to manage the session based on the subscription information, specifically:

(1) The PCF identifies the "GERA" access type, makes decisions for this type, and decides to execute the policy to shut down;

(2) PCF returns a message to SMF, the message contains a reason value instructing SMF to execute policy control until switching to 4G or 5G network (that is, corresponding to the above refusal to issue policy and issue the reason value);

(3) The SMF performs policy control based on local configuration or subscription information, manages sessions, and re-requests the PCF for policies until the 4G or 5G access type information is monitored.

3. The PCF identifies the "GERA" access network type, makes policy decisions, and deactivates some policies in the policy. The SMF manages the session according to the policy issued by the PCF, specifically:

(1) The PCF identifies the "GERA" access type, makes decisions for this type, and deactivates some policies;

(2) The PCF returns a "200 OK" message to the SMF, and the message carries 2G policy information, wherein the QoS parameter is a parameter suitable for 2G.

It can be seen from the above that the solutions provided by the embodiments of the present invention solve the problem of policy control of 2G network access in the 2G, 4G and 5G converged network architectures. In the process of 2G, 4G and 5G interoperability, PCF executes policy shutdown or partial policy shutdown for 2G networks, and SMF executes policy control according to 2G subscription information, which avoids possible problems caused by unreasonable parameter mapping performed by SMF in the prior art. The session is interrupted and the N7 port signaling transmission is saved.

An embodiment of the present invention also provides a policy control device, which is applied to a policy control functional entity, as shown in FIG. 7 , including:

The first determination module 71 is used to determine the policy control information for the 2G network;

a first sending module 72, configured to send 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, where the other networks include at least one of a 4G network and a 5G network.

The policy control apparatus 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 subsection indicating policy shutdown. information, or second sub-information indicating part of the policy used in other networks, including at least one of 4G networks and 5G networks; in the process of enabling 2G, 4G and 5G interoperability, the PCF is used for 2G networks. Execution policy shutdown or partial policy shutdown enables SMF to execute policy control according to 2G subscription information or policies applicable to 2G issued by PCF, avoiding session interruption that may be caused by SMF performing unreasonable parameter mapping in the prior art, At the same time, the N7 port signaling transmission is saved; the problem of consuming a large amount of signaling and PCF performance in the strategy control scheme for accessing the 2G network in the prior art, and even causing communication interruption, is well solved.

Wherein, the first sending module includes: a first sending sub-module, configured to create a response message through the first session management policy during the process of the terminal accessing the 4G network, and send the first sub-information to the SMF; or, when the terminal is in the 4G network and performs session modification, sending the first sub-information to the SMF through a first session management policy update response message.

Further, the policy control device further includes: a first receiving module, configured to receive the process of switching the terminal from the 4G network to the 2G network after sending the first sub-information to the SMF In the second session management policy update request message sent by the SMF, the second session management policy update request message carries first indication information indicating that the type of the network to be accessed by the terminal currently is a 2G network; a feedback module, 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 a second indication indicating that the policy is rejected information and a first cause value; wherein, the first cause value indicates that the type of the network to be accessed by the terminal currently is a 2G network.

Wherein, the first determining module includes: a first receiving sub-module, configured to receive a preset request message sent by the SMF under preset conditions; the preset request message carries a network indicating that the terminal is currently to access The type is the third indication information of the 2G network; the first determination sub-module is used to determine the first sub-information or the second sub-information for accessing the 2G network according to the third indication information; stop; the first sending module includes: a first feedback sub-module, 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; wherein, the preset condition is a situation in which the terminal initially accesses a 2G network or a situation in which the terminal is switched to a 2G network from the 5G network, and the preset request message is a session management policy creation request message , the preset response message is a session management policy creation response message; or, the preset condition is a situation in which the terminal is switched from the 4G network to the 2G network, and the preset request message is a session management policy update request message, the preset response message is a session management policy update response message; the second cause value indicates that the type of the network to be accessed by the terminal currently is a 2G network.

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

In the embodiment of the present invention, when the terminal initially accesses the 2G network or is switched from the 5G network to the 2G network, the second sub-information includes: public land mobile network PLMN change information, access type change, access type change at least one of incoming network charging 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 Including: resource modification request information, terminal IP address change information, terminal session or resource usage report information, application traffic start information, application traffic end information, access network information report information, packet-switched PS data close state change information, default service Quality QoS change information, session aggregation maximum bit rate Session-AMBR change information, QoS notification information, identity authentication reassignment information, presence area change information, service area change information, policy control revalidation timeout information, resource release notification information, resource allocation Success notification information, reflected QoS information, packet filter number report information, terminal UE time zone change information, authentication and authentication information change information, delay sensitive network bridge information information, QoS monitoring information, cell change information, evolved packet system EPS At least one of 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.

The above-mentioned implementation embodiments of the policy control method on the policy control functional entity side are all applicable to the embodiments of the policy control apparatus, and can also achieve the same technical effect.

An embodiment of the present invention further provides a policy control device, which is applied to a session management functional entity, as shown in FIG. 8 , including:

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

a first processing module 82, configured to perform session management according to the policy control information when the type of the network to be accessed by the terminal currently 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, where the other networks include at least one of a 4G network and a 5G network.

The policy control apparatus provided by the embodiment of the present invention receives policy control information for a 2G network sent by a policy control function PCF; in the case that the type of the network to be accessed by the terminal currently is a 2G network, the policy control information is performed according to the policy control information. Session management; wherein the policy control information includes first sub-information indicating policy shutdown, or second sub-information indicating part of policies used in other networks, where the other networks include at least one of 4G networks and 5G networks One; in the process of realizing 2G, 4G and 5G interoperability, the PCF can implement 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 policies applicable to 2G issued by the PCF, It avoids the session interruption that may be caused by the unreasonable parameter mapping performed by the SMF in the prior art, and saves the N7 port signaling transmission at the same time. PCF performance and even cause communication interruption problems.

Wherein, the second receiving module includes: a second receiving sub-module, configured to receive the first session management policy created by the PCF during the process of the terminal accessing the 4G network, and the first session management policy sent by the PCF A sub-information; 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.

Further, the policy control device further includes: a second sending module, configured to, after receiving the first sub-information sent by the PCF, perform a process of switching the terminal from the 4G network to the 2G network Step 2: Send a second session management policy update request message to the PCF, where the second session management policy update request message carries the first indication information indicating that the type of the network currently to be accessed by the terminal is a 2G network; Three receiving modules, 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 a second indication indicating refusal to issue a policy information and a first cause value; wherein, the first cause value indicates that the type of the network to be accessed by the terminal currently is a 2G network.

In the embodiment of the present invention, the policy control apparatus further includes: a third sending module, configured to send, under preset conditions, to the PCF before receiving the policy control information for the 2G network sent by the policy control function PCF Sending a preset request message; the preset request message carries third indication information indicating that the type of the network to be accessed by the terminal is a 2G network; the second receiving module includes: a third receiving sub-module for 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; wherein the preset response message Suppose the condition is that the terminal initially accesses the 2G network or is switched 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 Create a response message; or, the preset condition is that the terminal is switched 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 session management Policy update response message; the second reason value indicates that the type of the network to be accessed by the terminal currently is a 2G network.

Wherein, the first processing module includes: a first processing sub-module, configured to configure information according to a local policy or obtain from a preset information storage network element when the policy control information includes the first sub-information Session management is performed according to the policy subscription information of the second sub-information; or, in the case that the policy control information includes the second sub-information, session management is performed according to a part of the policy indicated in the second sub-information.

In the embodiment of the present invention, when the terminal initially accesses the 2G network or is switched from the 5G network to the 2G network, the second sub-information includes: public land mobile network PLMN change information, access type change, access type change at least one of incoming network charging 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 Including: resource modification request information, terminal IP address change information, terminal session or resource usage report information, application traffic start information, application traffic end information, access network information report information, packet-switched PS data close state change information, default service Quality QoS change information, session aggregation maximum bit rate Session-AMBR change information, QoS notification information, identity authentication reassignment information, presence area change information, service area change information, policy control revalidation timeout information, resource release notification information, resource allocation Success notification information, reflected QoS information, packet filter number report information, terminal UE time zone change information, authentication and authentication information change information, delay sensitive network bridge information information, QoS monitoring information, cell change information, evolved packet system EPS At least one of 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.

The above-mentioned implementation embodiments of the policy control method on the side of the session management function entity are all applicable to the embodiments of the policy control apparatus, and can also achieve the same technical effect.

An embodiment of the present invention further provides a functional entity, where the functional entity is a policy control functional entity, as shown in FIG. 9 , including: a processor 91 and a transceiver 92;

The processor 91 is configured to determine policy control information for the 2G network;

sending the policy control information to the session management function SMF through the transceiver 92;

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

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 first sub-information indicating policy shutdown , or the second sub-information indicating part of the policy used in other networks, the other networks include at least one of 4G networks and 5G networks; in the process of enabling 2G, 4G and 5G interoperability, the PCF is used for 2G networks. Policy shutdown or partial policy shutdown enables SMF to execute policy control according to 2G subscription information or policies applicable to 2G issued by PCF, avoiding session interruption that may be caused by unreasonable parameter mapping performed by SMF in the prior art, and at the same time It saves N7 port signaling transmission; it solves the problem of consuming a lot of signaling and PCF performance, and even causing communication interruption, in the strategy control scheme for accessing 2G network in the prior art.

Wherein, the processor is specifically configured to: use the transceiver to create a response message through a first session management policy in the process of the terminal accessing the 4G network, and send the first sub-information to the SMF or, using the transceiver to send the first sub-information to the SMF through a first session management policy update response message when the terminal is in the 4G network and the session is modified.

Further, the processor is further configured to: after the first sub-information is sent to the SMF, receive through the transceiver, during the process of switching the terminal from the 4G network to the 2G network, the A second session management policy update request message sent by the SMF, where the second session management policy update request message carries first indication information indicating that the type of the network to be accessed by the terminal is a 2G network; according to the first Indication information, the transceiver feeds back a second session management policy update response message to the SMF, where the second session management policy update response message carries the second indication information indicating that the policy is rejected and the first reason value ; wherein, the first cause value indicates that the type of the network to be accessed by the terminal currently is a 2G network.

The processor is specifically configured to: receive a preset request message sent by the SMF under preset conditions through the transceiver; the preset request message carries an indication that the type of the network currently to be accessed by the terminal is 2G third indication information of the network; according to the third indication information, determine the first sub-information or the second sub-information for accessing the 2G network; and execute policy shutdown; the processor is specifically configured to: The transceiver feeds 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; wherein the preset condition is the When the terminal initially accesses the 2G network or is switched 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 is switched 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 to be accessed by the terminal currently is a 2G network.

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.

In the embodiment of the present invention, when the terminal initially accesses the 2G network or is switched from the 5G network to the 2G network, the second sub-information includes: public land mobile network PLMN change information, access type change, access type change at least one of incoming network charging 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 Including: resource modification request information, terminal IP address change information, terminal session or use resource report information, application traffic start information, application traffic end information, access network information report information, packet-switched PS data close state change information, default service Quality QoS change information, session aggregation maximum bit rate Session-AMBR change information, QoS notification information, identity authentication reassignment information, presence area change information, service area change information, policy control revalidation timeout information, resource release notification information, resource allocation Success notification information, reflected QoS information, packet filter number report information, terminal UE time zone change information, authentication and authentication information change information, delay sensitive network bridge information information, QoS monitoring information, cell change information, evolved packet system EPS At least one of 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.

Wherein, the above-mentioned implementation embodiments of the policy control method on the side of the policy control functional entity are all applicable to the embodiments of the functional entity, and can also achieve the same technical effect.

An embodiment of the present invention further provides a functional entity, where the functional entity is a session management functional entity, as shown in FIG. 10 , including: a processor 101 and a transceiver 102;

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;

When the type of the network to be accessed by the terminal currently is a 2G network, perform 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, where the other networks include at least one of a 4G network and a 5G network.

The functional entity provided in the embodiment of the present invention receives the policy control information for the 2G network sent by the policy control function PCF; in the case that the type of the network currently to be accessed by the terminal is the 2G network, the session is conducted according to the policy control information. management; wherein the policy control information includes first sub-information indicating policy shutdown, or second sub-information indicating part of policies used in other networks, where the other networks include at least one of a 4G network and a 5G network ;Able to realize 2G, 4G and 5G interoperability process, through PCF for 2G network execution strategy shutdown or partial strategy shutdown, so that SMF can execute strategy control according to 2G contract information or the strategy applicable to 2G issued by PCF, avoid It avoids the session interruption that may be caused by the unreasonable parameter mapping performed by the SMF in the prior art, and saves the N7 port signaling transmission; it solves the problem that the strategy control scheme for accessing the 2G network in the prior art consumes a lot of signaling and PCF. performance, and even problems causing communication interruptions.

Wherein, the processor is specifically configured to: receive, through the transceiver, the first sub-information sent by the PCF through the first session management policy to create a response message during the process of the terminal accessing the 4G network; Alternatively, 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 is received by the transceiver.

Further, the processor is further configured to: after receiving the first sub-information sent by the PCF, in the process of switching the terminal from the 4G network to the 2G network, send the message to the terminal through the transceiver. The PCF sends a second session management policy update request message, 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; 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 refusal to issue the policy and a first reason value ; wherein, the first cause value indicates that the type of the network to be accessed by the terminal currently is a 2G network.

In the embodiment of the present invention, the processor is further configured to: before receiving the policy control information for the 2G network sent by the policy control function PCF, under a preset condition, send a preset request to the PCF through the transceiver message; the preset request message carries third indication information indicating that the type of the network to be accessed by the terminal is a 2G network; the processor is specifically configured to: receive through the transceiver the PCF according to the first Three preset response messages indicating information feedback, the preset response message carries the first sub-information or the second sub-information, and a second cause value; wherein, the preset condition is that the terminal initially receives In the case of entering a 2G network or switching 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 The preset condition is that the terminal is switched 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 first The second cause value indicates that the type of the network to be accessed by the terminal currently is a 2G network.

Wherein, the processor is specifically configured to: in the case that the policy control information includes the first sub-information, perform session management according to the local policy configuration information or the policy subscription information obtained from the preset information storage network element; or , if the policy control information includes the second sub-information, perform session management according to a part of the policy indicated in the second sub-information.

In the embodiment of the present invention, when the terminal initially accesses the 2G network or is switched from the 5G network to the 2G network, the second sub-information includes: public land mobile network PLMN change information, access type change, access type change at least one of incoming network charging 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 Including: resource modification request information, terminal IP address change information, terminal session or resource usage report information, application traffic start information, application traffic end information, access network information report information, packet-switched PS data close state change information, default service Quality QoS change information, session aggregation maximum bit rate Session-AMBR change information, QoS notification information, identity authentication reassignment information, presence area change information, service area change information, policy control revalidation timeout information, resource release notification information, resource allocation Success notification information, reflected QoS information, packet filter number report information, terminal UE time zone change information, authentication and authentication information change information, delay sensitive network bridge information information, QoS monitoring information, cell change information, evolved packet system EPS At least one of 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.

Wherein, the above-mentioned implementation embodiments of the policy control method on the side of the session management functional entity are all applicable to the embodiments of the functional entity, and can also achieve the same technical effect.

An embodiment of the present invention further provides a functional entity, including a memory, a processor, and a program stored on the memory and running on the processor; the processor implements the above-mentioned policy control function when executing the program A policy control method on the entity side; or, when the processor executes the program, the above-mentioned policy control method on the entity side of the session management function is implemented.

Wherein, the above-mentioned implementation embodiments of the policy control method on the policy control functional entity side or the session management functional entity side are all applicable to the embodiments of the functional entity, and can also achieve the same technical effect.

An embodiment of the present invention further provides a readable storage medium, on which a program is stored, and when the program is executed by the processor, implements the steps in the policy control method on the entity side of the policy control function; or, the program is executed by the processor At the same time, the steps in the policy control method on the entity side of the session management function are implemented.

The above-mentioned implementation embodiments of the policy control method on the policy control functional entity side or the session management functional entity side are all applicable to the embodiments of the readable storage medium, and can also achieve the same technical effect.

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 implementations.

In this embodiment of the present invention, the modules/sub-modules may be implemented in software so as to be executed by various types of processors. For example, an identified executable code module may comprise one or more physical or logical blocks of computer instructions, which may be structured as objects, procedures, or functions, for example. Nonetheless, the executable code of the identified module need not be physically located together, but may include different instructions stored in different bits that, when logically combined, constitute the module and implement the specification of the module Purpose.

In practice, an executable code module may be a single instruction or many instructions, and may even be distributed over multiple different code segments, among different programs, and across multiple memory devices. Likewise, operational data may be identified within modules, and may be implemented in any suitable form and organized within any suitable type of data structure. The operational data may be collected as a single data set, or may be distributed over different locations (including over different storage devices), and may exist at least in part only as electronic signals on a system or network.

When a module can be implemented by software, considering the level of existing hardware technology, a module that can be implemented by software, regardless of cost, can build corresponding hardware circuits to implement corresponding functions. The hardware circuits include conventional very large scale integration (VLSI) circuits or gate arrays as well as off-the-shelf semiconductors such as logic chips, transistors, or other discrete components. A module may also be implemented in programmable hardware devices, such as field programmable gate arrays, programmable array logic, programmable logic devices, and the like.

The above are the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as It is the protection scope of the present invention.

Claims (28)

1. a strategy control method, applied to a strategy control functional entity, is characterized in that, comprising: Determine the policy control information for the 2G network; 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, where the other networks include at least one of a 4G network and a 5G network. 2. The policy control method according to claim 1, wherein the sending the policy control information to the session management function SMF comprises: During the process of the terminal accessing the 4G network, a response message is created through the first session management policy, and the first sub-information is sent to the SMF; or, When the terminal is in the 4G network and the session is modified, the first sub-information is sent to the SMF through a first session management policy update response message. 3. The policy control method according to claim 2, wherein after sending the first sub-information to the SMF, the method further comprises: Receive a second session management policy update request message sent by the SMF in the process of switching the terminal from the 4G network to the 2G network, where the second session management policy update request message carries a message indicating that the terminal is currently waiting. The type of the access network is the first indication information of the 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 refusal to issue the policy and a first reason value ; The first cause value indicates that the type of the network to be accessed by the terminal currently is a 2G network. 4. The policy control method according to claim 1, wherein the determining the policy control information for accessing the 2G network comprises: 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 to be accessed by the terminal currently is a 2G network; According to the third indication information, determine the first sub-information or the second sub-information for accessing the 2G network; and execute policy shutdown; The sending the policy control information to the session management function SMF includes: Feeding 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; Wherein, the preset condition is a situation of the terminal initially accessing a 2G network or a situation of switching 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 creates a response message for the session management policy; or, The preset condition is that the terminal is switched 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. 5 . The policy control method according to claim 4 , wherein the determining the second sub-information for accessing the 2G network according to the third indication information comprises: 5 . The second sub-information for accessing the 2G network is determined according to the third indication information and the 2G network capability information. 6 . The policy control method according to claim 1 , wherein when the terminal initially accesses the 2G network or is switched from the 5G network to the 2G network, the second sub-information includes: 6 . 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 is switched 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 use resource reporting information, application traffic start information, and application traffic end information , access network information reporting information, packet-switched 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 reassignment information, and presence area change information , service area change information, policy control revalidation timeout information, resource release notification information, resource allocation success notification information, reflection QoS information, packet filter number reporting information, terminal UE time zone change information, authentication and 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 joining IP multicast group information, 5G rate group leaving IP multicast group information , at least one of data network name DDN failure information and DDN transmission status information. 7. A policy control method, applied to a session management functional entity, is characterized in that, comprising: Receive the policy control information for the 2G network sent by the policy control function PCF; When the type of the network to be accessed by the terminal currently is a 2G network, perform 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, where the other networks include at least one of a 4G network and a 5G network. 8. The policy control method according to claim 7, wherein the receiving policy control information for the 2G network sent by the policy control function PCF comprises: receiving the first sub-information sent by the PCF by creating a response message through the first session management policy 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. 9. The policy control method according to claim 8, wherein after receiving the first sub-information sent by the PCF, the method further comprises: In the process of switching the terminal from the 4G network to the 2G network, a second session management policy update request message is sent to the PCF, where the second session management policy update request message carries a message indicating that the terminal is currently waiting The type of network access is the first indication information of the 2G network; 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 refusal to issue the policy and a first reason value ; The first cause value indicates that the type of the network to be accessed by the terminal currently is a 2G network. 10. The policy control method according to claim 7, wherein before receiving the policy control information for the 2G network sent by the policy control function PCF, the method further comprises: Under preset conditions, send a preset request message to the PCF; the preset request message carries third indication information indicating that the type of the network to be accessed by the terminal currently is a 2G network; The policy control information for the 2G network sent by the policy control function PCF, including: 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; Wherein, the preset condition is a situation of the terminal initially accessing a 2G network or a situation of switching 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 creates a response message for the session management policy; or, The preset condition is that the terminal is switched 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. 11. The policy control method according to claim 7, wherein the performing session management according to the policy control information comprises: In the case that the policy control information includes the first sub-information, session management is performed according to the local policy configuration information or the policy subscription information obtained from the preset information storage network element; or, When the policy control information includes the second sub-information, session management is performed according to the partial policy indicated in the second sub-information. 12. The policy control method according to any one of claims 7-11, wherein when the terminal initially accesses a 2G network or is switched 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 is switched 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 use resource reporting information, application traffic start information, and application traffic end information , access network information reporting information, packet-switched 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 reassignment information, and presence area change information , service area change information, policy control revalidation timeout information, resource release notification information, resource allocation success notification information, reflection QoS information, packet filter number reporting information, terminal UE time zone change information, authentication and 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 joining IP multicast group information, 5G rate group leaving IP multicast group information , at least one of data network name DDN failure information and DDN transmission status information. 13. A strategy control device, applied to a strategy control functional entity, characterized in that it comprises: a first determining module, configured to determine policy control information for the 2G network; a first sending module, configured to send 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, where the other networks include at least one of a 4G network and a 5G network. 14. The policy control apparatus according to claim 13, wherein the first sending module comprises: a first sending sub-module, configured to create a response message through a first session management policy during the process of the terminal accessing the 4G network, and send the first sub-information to the SMF; or, When the terminal is in the 4G network and the session is modified, the first sub-information is sent to the SMF through a first session management policy update response message. 15. The policy control device according to claim 14, further comprising: a first receiving module, configured to receive the second session management policy update sent by the SMF during the process of switching the terminal from the 4G network to the 2G network after the first sub-information is sent to the SMF a request message, where the second session management policy update request message carries first indication information indicating that the type of the network to be accessed by the terminal currently is a 2G network; a first feedback module, 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 a second message indicating refusal to issue a policy indication information and first cause value; The first cause value indicates that the type of the network to be accessed by the terminal currently is a 2G network. 16. The policy control apparatus according to claim 13, wherein the first determining module comprises: a first receiving sub-module, 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 to be accessed by the terminal currently is a 2G network; a first determination sub-module, configured to determine the first sub-information or the second sub-information for accessing the 2G network according to the third indication information; and perform policy shutdown; The first sending module includes: a first feedback sub-module, 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; Wherein, the preset condition is a situation of the terminal initially accessing a 2G network or a situation of switching 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 creates a response message for the session management policy; or, The preset condition is that the terminal is switched 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. 17 . The policy control apparatus according to claim 16 , wherein the determining the second sub-information for accessing a 2G network according to the third indication information comprises: 17 . The second sub-information for accessing the 2G network is determined according to the third indication information and the 2G network capability information. 18. The policy control apparatus according to any one of claims 13-17, wherein when the terminal initially accesses a 2G network or is switched 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 is switched 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 use resource reporting information, application traffic start information, and application traffic end information , access network information reporting information, packet-switched 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 reassignment information, and presence area change information , service area change information, policy control revalidation timeout information, resource release notification information, resource allocation success notification information, reflection QoS information, packet filter number reporting information, terminal UE time zone change information, authentication and 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 joining IP multicast group information, 5G rate group leaving IP multicast group information , at least one of data network name DDN failure information and DDN transmission status information. 19. A policy control device, applied to a session management functional entity, characterized in that it comprises: A second receiving module, configured to receive policy control information for the 2G network sent by the policy control function PCF; a first processing module, configured to perform session management according to the policy control information when the type of the network to be accessed by the terminal currently 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, where the other networks include at least one of a 4G network and a 5G network. 20. The policy control device according to claim 19, wherein the second receiving module comprises: The second receiving sub-module is configured to receive the first sub-information sent by the PCF by creating a response message through the first session management policy 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. 21. The policy control device according to claim 20, further comprising: A second sending module, configured to send a second session management policy update to the PCF in the process of switching the terminal from the 4G network to the 2G network after receiving the first sub-information sent by the PCF a request message, 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 third receiving module, 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 a second session management policy update response message indicating refusal to issue a policy indication information and first cause value; The first cause value indicates that the type of the network to be accessed by the terminal currently is a 2G network. 22. The policy control device according to claim 19, further comprising: A third sending module, configured to send a preset request message to the PCF under preset conditions before receiving the policy control information for the 2G network sent by the policy control function PCF; the preset request message carries an indication The third indication information that the type of the network to be accessed by the terminal currently is the 2G network; The second receiving module includes: A third receiving sub-module, 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 the second sub-information reason value; Wherein, the preset condition is a situation of the terminal initially accessing a 2G network or a situation of switching 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 creates a response message for the session management policy; or, The preset condition is that the terminal is switched 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. 23. The policy control apparatus according to claim 19, wherein the first processing module comprises: 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 subinformation; or, When the policy control information includes the second sub-information, session management is performed according to the partial policy indicated in the second sub-information. 24. The policy control apparatus according to any one of claims 19-23, wherein when a terminal initially accesses a 2G network or is switched 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 is switched 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 use resource reporting information, application traffic start information, and application traffic end information , access network information reporting information, packet-switched 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 reassignment information, and presence area change information , service area change information, policy control revalidation timeout information, resource release notification information, resource allocation success notification information, reflection QoS information, packet filter number reporting information, terminal UE time zone change information, authentication and 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 joining IP multicast group information, 5G rate group leaving IP multicast group information , at least one of data network name DDN failure information and DDN transmission status information. 25. A functional entity, the functional entity being a policy control functional entity, characterized in that it comprises: a processor and a transceiver; the processor, configured to determine policy control information for the 2G network; sending the policy control information to the session management function SMF through the transceiver; The policy control information includes first sub-information indicating policy shutdown, or second sub-information indicating partial policies used in other networks, where the other networks include at least one of a 4G network and a 5G network. 26. A functional entity, the functional entity being a session management functional entity, characterized in that it comprises: a processor and a transceiver; the processor, configured to receive, through the transceiver, the policy control information for the 2G network sent by the policy control function PCF; When the type of the network to be accessed by the terminal currently is a 2G network, perform 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, where the other networks include at least one of a 4G network and a 5G network. 27. A functional entity, comprising a memory, a processor and a program stored on the memory and executable on the processor; it is characterized in that, when the processor executes the program, the program according to claim 1 to The strategy control method described in any one of 6; Or, The processor implements the policy control method according to any one of claims 7 to 12 when the processor executes the program. 28. A readable storage medium on which a program is stored, characterized in that, when the program is executed by a processor, the steps in the policy control method according to any one of claims 1 to 6 are implemented; or, When the program is executed by the processor, the steps in the policy control method according to any one of claims 7 to 12 are implemented.

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