CN114513858A

CN114513858A - Policy control method, device and functional entity

Info

Publication number: CN114513858A
Application number: CN202011284226.0A
Authority: CN
Inventors: 王玮; 黄震宁
Original assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Current assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Priority date: 2020-11-17
Filing date: 2020-11-17
Publication date: 2022-05-17

Abstract

The invention provides a policy control method, a device and a functional entity, wherein the policy control method comprises the following steps: determining policy control information for the 2G network; sending the policy control information to a Session Management Function (SMF); the policy control information includes first sub information indicating policy shutdown or second sub information indicating a partial policy used in other networks including at least one of a 4G network and a 5G network. The scheme can realize that in the process of 2G, 4G and 5G interoperation, the PCF executes policy shutdown or partial policy shutdown aiming at the 2G network, so that the SMF can execute policy control according to the 2G subscription information or the policy which is issued by the PCF and is suitable for 2G, session interruption possibly caused by unreasonable parameter mapping executed by the SMF in the prior art is avoided, and meanwhile signaling transmission of an N7 port is saved; the method well solves the problems that a policy control scheme accessed to the 2G network in the prior art consumes a large amount of signaling and PCF performance, and even causes communication interruption.

Description

Policy control method, device and functional entity

Technical Field

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

Background

In the prior art, when a terminal initially accesses a 2G network or is switched to 2G by another network (such as 4G or 5G), an SMF (session management function) interacts with a PCF (policy control function), the PCF issues a corresponding policy through N7 ports, QoS parameters in the policy are all 5G QoS (quality of service) parameters, and the SMF maps the 5G QoS parameters to the 2G QoS parameters through the 4G QoS parameters. In the method, when a terminal is switched to a 2G network, an Npcf _ SMPolicyControl _ Update service is called, a PCF issues a strategy, the strategy may contain 2G unnecessary strategy information and Trigger (event), a large amount of signaling and PCF performance are consumed, for example, the 2G does not support special load, and the PCF only needs to issue a default rule when issuing the strategy; in addition, in the prior art, the SMF performs mapping from the 5G QoS parameter to the 2G QoS parameter, and communication interruption may be caused by improper configuration of the 5G QoS parameter and the mapping rule, for example, when a Session-AMBR (aggregate maximum bit rate) equivalent value applicable to 5G is mapped to an AMBR of 2G, the capability of the 2G network may be exceeded, and if a rate limit is configured on an existing network SGSN and an AMBR value issued by the SMF exceeds the limit, the Session is directly rejected.

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

Disclosure of Invention

The invention aims to provide a policy control method, a policy control device and a policy control function entity, which aim to solve the problems that a policy control scheme for accessing a 2G network in the prior art consumes a large amount of signaling and PCF performance, and even causes communication interruption.

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

determining policy control information for the 2G network;

sending the policy control information to a Session Management Function (SMF);

wherein the policy control information includes first sub information indicating policy shutdown or second sub information indicating a part of policies used in other networks including at least one of a 4G network and a 5G network.

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

in the process that the terminal accesses the 4G network, a response message is created through a first session management strategy, and the first sub-information is sent to the SMF; or,

and under the condition that the terminal is in the 4G network and session modification is carried out, sending the first sub-information 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:

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

feeding back a second session management policy update response message to the SMF according to the first indication information, wherein the second session management policy update response message carries second indication information indicating that the issuing of the policy is refused and a first reason value;

and the first reason value indicates that the type of the current network to be accessed by the terminal is a 2G network.

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

receiving a preset request message sent by the SMF under a preset condition; the preset request message carries third indication information indicating that the type of the current network to be accessed by the terminal is a 2G network;

determining the first sub-information or the second sub-information aiming at accessing the 2G network according to the third indication information; and executing policy shutdown;

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

feeding back a preset response message to the SMF, wherein the preset response message carries the first sub information or the second sub information and a second reason value;

the preset condition is a condition that the terminal initially accesses a 2G network or a condition that the 5G network is switched 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;

and the second reason value indicates that the type of the current network to be accessed by the terminal is a 2G network.

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

and determining the second sub-information aiming at accessing the 2G network according to the third indication information and the 2G network capability information.

Optionally, in a case that the terminal initially accesses the 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 correlation information, identity authentication management session failure information and radio access technology type change information; and/or the presence of a gas in the gas,

when the terminal is switched from the 4G network to the 2G network, the second sub-information comprises: resource modification request information, terminal IP address change information, terminal Session or used resource report information, application traffic start information, application traffic end information, access network information report information, packet switched PS data closed state change information, default quality of service (QoS) change information, Session aggregation maximum bit rate Session-AMBR change information, QoS notification information, identity authentication reallocation information, 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 report information, terminal UE time zone change information, authentication information change information, delay sensitive network bridge information, QoS monitoring information, cell change information, evolved packet System EPS fallback information, multiple access Session information, access network information, service control information, service area change information, access control information, and access control information, and access control information, access control, At least one of 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 embodiment of the invention also provides a policy control method, which is applied to the session management functional entity and comprises the following steps:

receiving policy control information aiming at the 2G network sent by a policy control function PCF;

under the condition that the type of the current network to be accessed by the terminal is a 2G network, session management is carried out according to the strategy control information;

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 through a first session management strategy creation response message in the process that the terminal accesses the 4G network; or,

and receiving the first sub information sent by the PCF through a first session management policy update response message under the condition that the terminal is in the 4G network and session modification is carried out.

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

sending a second session management policy update request message to the PCF in the process that the terminal is switched from the 4G network to the 2G network, wherein the second session management policy update request message carries first indication information indicating that the type of the current network access to be waited by the terminal is the 2G network;

receiving a second session management policy update response message fed back by the PCF according to the first indication information, wherein the second session management policy update response message carries second indication information indicating that the issuing of the policy is refused and a first reason value;

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

sending a preset request message to the PCF under a preset condition; the preset request message carries third indication information indicating that the type of the current network to be accessed by the terminal is a 2G network;

the receiving policy control information for the 2G network sent by the policy control function PCF includes:

receiving a preset response message fed back by the PCF according to the third indication information, wherein the preset response message carries the first sub-information or the second sub-information and a second reason value;

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

under the condition that the policy control information comprises the first sub-information, performing session management according to local policy configuration information or policy subscription information acquired from a preset information storage network element; or,

and under the condition that the policy control information comprises the second sub information, performing session management according to part of policies indicated in the second sub information.

The embodiment of the invention also provides a policy control device, which is applied to the policy control functional entity and comprises the following components:

a first determining module for determining policy control information for a 2G network;

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

wherein the policy control information includes first sub information indicating policy shutdown or second sub information indicating a partial policy used in other networks including at least one of a 4G network and a 5G network.

Optionally, the first sending module includes:

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

Optionally, the method further includes:

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

a first feedback module, configured to feed back, to the SMF, a second session management policy update response message according to the first indication information, where the second session management policy update response message carries second indication information indicating that the issuing of the policy is rejected and a first cause value;

Optionally, the first determining module includes:

the first receiving submodule is used for receiving a preset request message sent by the SMF under a preset condition; the preset request message carries third indication information indicating that the type of the current network to be accessed by the terminal is a 2G network;

a first determining sub-module, configured to determine, according to the third indication information, the first sub-information or the second sub-information for accessing the 2G network; and executing 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;

the preset condition is that the terminal initially accesses to a 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,

and determining the second sub information aiming at accessing the 2G network according to the third indication information and the 2G network capability information.

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

the second receiving module is used for receiving the policy control information aiming at the 2G network and sent by the policy control function PCF;

the first processing module is used for carrying out session management according to the strategy control information under the condition that the type of the current network to be accessed of the terminal is a 2G network;

Optionally, the second receiving module includes:

a second receiving submodule, configured to receive the first sub-information sent by the PCF through a first session management policy creation response message in a process that the terminal accesses the 4G network; or,

Optionally, the method further includes:

a second sending module, configured to send, after receiving the first sub-information sent by the PCF, a second session management policy update request message to the PCF in a process in which the terminal is switched from the 4G network to the 2G network, where the second session management policy update request message carries first indication information indicating that a type of the terminal currently waiting for network access is the 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 second indication information indicating that the policy is rejected to be issued and a first cause value;

Optionally, the method further includes:

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

the second receiving module includes:

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

the second reason value indicates that the type of the current network to be accessed by the terminal is a 2G network.

Optionally, the first processing module includes:

the first processing sub-module is used for carrying out session management according to local policy configuration information or policy subscription information acquired from a preset information storage network element under the condition that the policy control information comprises the first sub-information; or,

The embodiment of the present invention further provides a functional entity, where the functional entity is a policy control functional entity, and the functional entity includes: a processor and a transceiver;

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

sending the policy control information to a Session Management Function (SMF) through the transceiver;

Optionally, the processor is specifically configured to:

utilizing the transceiver to establish a response message through a first session management policy in the process that the terminal accesses the 4G network, and sending the first sub-information to the SMF; or,

and sending the first sub information to the SMF through a first session management policy update response message by using the transceiver under the condition that the terminal is in the 4G network and session modification is carried out.

Optionally, the processor is further configured to:

after the first sub-information is sent to the SMF, a second session management policy updating request message sent by the SMF in the process that the terminal is switched from the 4G network to the 2G network is received through the transceiver, wherein the second session management policy updating request message carries first indication information indicating that the type of the current network to be accessed by the terminal is the 2G network;

feeding back a second session management policy update response message to the SMF through the transceiver according to the first indication information, wherein the second session management policy update response message carries second indication information indicating that the issuing of the policy is refused and a first reason value;

Optionally, the processor is specifically configured to:

receiving a preset request message sent by the SMF under a preset condition through the transceiver; the preset request message carries third indication information indicating that the type of the current network to be accessed by the terminal is a 2G network;

determining the first sub information or the second sub information aiming at accessing a 2G network according to the third indication information; and executing policy shutdown;

the processor is specifically configured to:

feeding back a preset response message to the SMF through the transceiver, wherein the preset response message carries the first sub information or the second sub information and a second reason value;

Optionally, the processor is specifically configured to:

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

the processor is used for receiving policy control information aiming at the 2G network sent by a policy control function PCF through the transceiver;

Optionally, the processor is specifically configured to:

receiving, by the transceiver, the first sub-information sent by the PCF via a first session management policy creation response message in a process in which a terminal accesses the 4G network; or,

and receiving the first sub-information sent by the PCF through a first session management policy update response message under the condition that the terminal is in the 4G network and session modification is carried out through the transceiver.

Optionally, the processor is further configured to:

after receiving the first sub-information sent by the PCF, sending a second session management policy updating request message to the PCF through the transceiver in the process that the terminal is switched from the 4G network to the 2G network, wherein the second session management policy updating request message carries first indication information indicating that the type of the current network access to be waited by the terminal is the 2G network;

receiving, by the transceiver, a second session management policy update response message fed back by the PCF according to the first indication information, where the second session management policy update response message carries second indication information indicating that issuing of a policy is denied and a first cause value;

Optionally, the processor is further configured to:

before receiving policy control information aiming at a 2G network sent by a policy control function PCF, sending a preset request message to the PCF through the transceiver under a preset condition; the preset request message carries third indication information indicating that the type of the current network to be accessed by the terminal is a 2G network;

the processor is specifically configured to:

receiving a preset response message fed back by the PCF according to the third indication information through the transceiver, wherein the preset response message carries the first sub-information or the second sub-information and a second reason value;

Optionally, the processor is specifically configured to:

The embodiment of the invention also provides a functional entity, which comprises a memory, a processor and a program which is stored on the memory and can be operated on the processor; when the processor executes the program, the policy control method of the policy control function entity side is realized; or, the processor implements the policy control method on the session management function entity side when executing the program.

An embodiment of the present invention further provides a readable storage medium, on which a program is stored, where the program, when executed by a processor, implements the steps in the policy control method on the policy control function entity side; alternatively, the program implements the steps in the policy control method on the session management function entity side described above when executed by the processor.

The technical scheme of the invention has the following beneficial effects:

in the scheme, the policy control method determines policy control information for the 2G network; sending the policy control information to a Session Management Function (SMF); wherein the policy control information includes first sub information indicating policy shutdown or second sub information indicating a partial policy used in other networks including at least one of a 4G network and a 5G network; in the process of 2G, 4G and 5G interoperation, the PCF executes policy shutdown or partial policy shutdown aiming at the 2G network, so that the SMF can execute policy control according to the 2G subscription information or the policy which is sent by the PCF and is applicable to the 2G, session interruption possibly caused by unreasonable parameter mapping executed by the SMF in the prior art is avoided, and meanwhile signaling transmission of an N7 port is saved; the method well solves the problems that a policy control scheme accessed to the 2G network in the prior art consumes a large amount of signaling and PCF performance, and even causes communication interruption.

Drawings

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

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

fig. 3 is a first schematic view illustrating a session management policy connection establishment process according to an embodiment of the present invention;

fig. 4 is a first schematic diagram illustrating a session management policy updating flow according to an embodiment of the present invention;

fig. 5 is a schematic diagram illustrating a session management policy updating flow according to an embodiment of the present invention;

fig. 6 is a schematic diagram illustrating a session management policy connection establishment flow according to an embodiment of the present invention;

FIG. 7 is a first schematic structural diagram of a policy control device according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a policy control device according to an embodiment of the present invention;

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

fig. 10 is a functional entity structure diagram of the second embodiment of the present invention.

Detailed Description

In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.

The present invention provides a policy control method, applied to a policy control function entity, for solving the problems of consuming a large amount of signaling and PCF performance, and even causing communication interruption in the policy control scheme accessing to a 2G network in the prior art, as shown in fig. 1, including:

step 11: determining policy control information for the 2G network;

step 12: sending the policy control information to a Session Management Function (SMF); wherein the policy control information includes first sub information indicating policy shutdown or second sub information indicating a part of policies used in other networks including at least one of a 4G network and a 5G network.

Part of the strategy is determined according to the 2G capability and is matched with the 2G subscription information.

The policy control method provided by the embodiment of the invention determines the policy control information aiming at the 2G network; sending the policy control information to a Session Management Function (SMF); wherein the policy control information includes first sub information indicating policy shutdown or second sub information indicating a partial policy used in other networks including at least one of a 4G network and a 5G network; in the process of 2G, 4G and 5G interoperation, the PCF executes policy shutdown or partial policy shutdown aiming at the 2G network, so that the SMF can execute policy control according to the 2G subscription information or the policy which is sent by the PCF and is applicable to the 2G, session interruption possibly caused by unreasonable parameter mapping executed by the SMF in the prior art is avoided, and meanwhile signaling transmission of an N7 port is saved; the method well solves the problems that a policy control scheme accessed to the 2G network in the prior art consumes a large amount of signaling and PCF performance, and even causes communication interruption. The policy applicable to 2G and issued by the PCF may be direct issue or indirect issue, the direct issue may be issuing an activation event (it may also be understood that the issued information is the policy applicable to 2G), and the indirect issue may be issuing a deactivation event (it may also be understood that the issued information is the policy to be deactivated, and the SMF may obtain the policy applicable to 2G accordingly).

Wherein the sending the policy control information to a session management function SMF includes: in the process that the terminal accesses the 4G network, a response message is created through a first session management strategy, and the first sub-information is sent to the SMF; or, when the terminal is in the 4G network and session modification is performed, the first sub-information is sent 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 message sent by the SMF in a process that the terminal is switched from the 4G network to the 2G network, where the second session management policy update request message carries first indication information indicating that a type of a network to be currently accessed by the terminal is the 2G network; feeding back a second session management policy update response message to the SMF according to the first indication information, wherein the second session management policy update response message carries second indication information indicating that the issuing of the policy is refused and a first reason value; and the first reason value indicates that the type of the current network to be accessed by the terminal is a 2G network.

Wherein the determining policy control information for accessing the 2G network comprises: receiving a preset request message sent by the SMF under a preset condition; the preset request message carries third indication information indicating that the type of the current network to be accessed by the terminal is a 2G network; determining the first sub information or the second sub information aiming at accessing a 2G network according to the third indication information; and executing policy shutdown; the sending the policy control information to a 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 a partial shutdown or activation policy), and a second cause value; the preset condition is a condition that the terminal initially accesses a 2G network or a condition that the 5G network is switched to the 2G network, the preset request message is a session management policy creation request message, and the preset response message is a session management policy creation response message; or, the preset condition is a condition 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; and the second reason value indicates that the type of the current network to be accessed by the terminal is a 2G network.

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

In this 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: at least one of public land mobile network PLMN change information, access type change information, access network charging correlation information, authentication management session failure information, and radio access technology type change information (which may specifically correspond to an activation event); 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 used resource report information, application traffic start information, application traffic end information, access network information report information, packet switched PS data closed state change information, default quality of service (QoS) change information, Session aggregation maximum bit rate Session-AMBR change information, QoS notification information, identity authentication reallocation information, 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 report information, terminal UE time zone change information, authentication information change information, delay sensitive network bridge information, QoS monitoring information, cell change information, evolved packet System EPS fallback information, multiple access Session information, access network information, service control information, service area change information, access control information, and access control information, and access control information, access control, At least one of 5G rate group join IP multicast group information, 5G rate group leave IP multicast group information, data network name DDN failure information, and DDN transmission state information (which may specifically correspond to a deactivation event).

An embodiment of the present invention further provides a policy control method, which is applied to a session management function entity, and as shown in fig. 2, the policy control method includes:

step 21: receiving policy control information aiming at the 2G network sent by a policy control function PCF;

step 22: under the condition that the type of the current network to be accessed by the terminal is a 2G network, session management is carried out according to the strategy control information; wherein the policy control information includes first sub information indicating policy shutdown or second sub information indicating a part of policies used in other networks including at least one of a 4G network and a 5G network.

The strategy control method provided by the embodiment of the invention receives the strategy control information aiming at the 2G network sent by the strategy control function PCF; under the condition that the type of the current network to be accessed by the terminal is a 2G network, session management is carried out according to the strategy control information; wherein the policy control information includes first sub information indicating policy shutdown or second sub information indicating a partial policy used in other networks including at least one of a 4G network and a 5G network; in the process of 2G, 4G and 5G interoperation, the PCF executes policy shutdown or partial policy shutdown aiming at the 2G network, so that the SMF can execute policy control according to the 2G subscription information or the policy which is sent by the PCF and is applicable to the 2G, session interruption possibly caused by unreasonable parameter mapping executed by the SMF in the prior art is avoided, and meanwhile signaling transmission of an N7 port is saved; the method well solves the problems that a policy control scheme accessed to the 2G network in the prior art consumes a large amount of signaling and PCF performance, and even causes communication interruption. The policy applicable to 2G and issued by the PCF may be direct issue or indirect issue, the direct issue may be issuing an activation event (it may also be understood that the issued information is the policy applicable to 2G), and the indirect issue may be issuing a deactivation event (it may also be understood that the issued information is the policy to be deactivated, and the SMF may obtain the policy applicable to 2G accordingly).

Wherein, the receiving policy control information for the 2G network sent by the policy control function PCF includes: receiving the first sub-information sent by the PCF through a first session management strategy creation response message in the process that 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 session modification is performed.

Further, after receiving the first sub-information sent by the PCF, the method further includes: sending a second session management policy update request message to the PCF in the process that the terminal is switched from the 4G network to the 2G network, wherein the second session management policy update request message carries first indication information indicating that the type of the current network access to be waited by the terminal is the 2G network; receiving a second session management policy update response message fed back by the PCF according to the first indication information, wherein the second session management policy update response message carries second indication information indicating that the issuing of the policy is refused and a first reason value; and the first reason value indicates that the type of the current network to be accessed by the terminal is a 2G network.

In the embodiment of the present invention, before receiving policy control information for a 2G network sent by a policy control function PCF, the method further includes: sending a preset request message to the PCF under a preset condition; the preset request message carries third indication information indicating that the type of the current network to be accessed by the terminal is a 2G network; the receiving policy control information for the 2G network sent by the policy control function PCF includes: receiving a preset response message fed back by the PCF according to the third indication information, where the preset response message carries the first sub-information or the second sub-information (i.e. the message carries a partial shutdown or activation policy), and a second cause value; the preset condition is a condition that the terminal initially accesses a 2G network or a condition that the 5G network is switched 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; and the second reason value indicates that the type of the current network to be accessed by the terminal is a 2G network.

Wherein, the performing session management according to the policy control information includes: under the condition that the policy control information comprises the first sub-information, performing session management according to local policy configuration information or policy subscription information acquired from a preset information storage network element; or, when the policy control information includes the second sub information, performing session management according to a part of policies indicated in the second sub information. The indicated part of the policy may be an activation event (which may be understood as activated information or activated policy) or a deactivation event (which may be understood as deactivated information or deactivated policy), and is not limited herein.

The local policy configuration information and the acquired policy subscription information are respectively matched with the 2G subscription information. The local policy configuration information may include QOS parameter information and event information; the preset information storage network element can be a Home Subscriber Server (HSS) or a unified data management platform (UDM); the policy subscription information may include QOS parameter information.

The following further describes the policy control method provided by the embodiment of the present invention with reference to multiple sides, such as a policy control function entity and a session management function entity.

To solve the above technical problem, an embodiment of the present invention provides a policy control method, which can be specifically implemented as a method for performing policy shutdown or partial policy shutdown by a PCF, and relates to: in the 2G, 4G, and 5G converged architecture, if the terminal is accessed by the 2G (may be an initial access or a handover access), the PCF performs policy shutdown or partial policy shutdown. If the PCF policy is off, the SMF performs policy control based on local configuration (i.e. the local policy configuration information) or subscription information (i.e. the policy subscription information, which may also be referred to as subscription policy information); if the PCF releases the partial strategy, the SMF executes the partial strategy according to the strategy (namely the partial strategy indicated in the second sub-information) released by the PCF.

The scheme provided by the embodiment of the invention relates to the following three types:

first, PCF issues in advance an indication of 2G policy shutdown (corresponding to the situation where the first sub-information is sent via the first session management policy creation response message or the first session management policy update response message), after the terminal switches to the 2G network, SMF manages the session based on local configuration (including QOS parameter information and event information) or subscription information (including QOS parameter information), and notifies PCF, which executes policy shutdown; the subscription information may be obtained by using a home subscriber server HSS or a unified data management platform UDM;

secondly, aiming at the condition that a terminal is initially accessed to 2G or switched to 2G from 4G or 5G, the PCF executes policy shutdown on the type of a GERA (namely 2G) access network, a message returned to the SMF does not carry policy information, a carrying reason value indicates that the current PCF is in a policy shutdown state (namely the feedback preset response message carries first sub-information), and the SMF manages the session according to local configuration or subscription information;

thirdly, aiming at the condition that the terminal is initially accessed to 2G or switched to 2G from 4G or 5G, the PCF issues a strategy to the 'GERA' access type, part of the strategy used in the 4G or 5G is deactivated in the strategy (namely the feedback preset response message carries second sub-information), the SMF executes a session management function according to the strategy issued by the PCF, and the scheme can be suitable for a scene that an operator requires that the strategy is decided and issued by the PCF. The policy for the part may be determined according to the 2G capability.

The scheme provided by the embodiment of the invention is illustrated below.

Example 1 (corresponding to the first scheme described above):

the terminal accesses 4G, in the session establishment (as shown in figure 3) or update process (as shown in figure 4), the PCF issues a policy to the SMF, the policy contains an indication parameter, when the terminal is identified to be switched to the 2G network, the PCF executes policy shutdown, and the SMF manages the session based on local configuration or subscription information and notifies the PCF. Fig. 3 may be understood as a process in which SMF establishes SM Policy (session management Policy) connection with PCF, and fig. 4 may be understood as a process in which session management related Policy is updated.

1. Performing the following 1a or 1b operations:

a terminal accesses 4G, and during a session establishment procedure, may invoke Npcf _ SMPolicyControl _ Create service, where the flow is as shown in fig. 3, the SMF may send a request with a message format of POST to the PCF, the PCF replies "201 Created (i.e. creating a response message, corresponding to the first session management policy creating response message)", and a message body may include a PCC (policy and charging control) policy and Triggers (event) for triggering policy update, where the PCC policy includes a policy when the 2G access, i.e. an indication parameter indicating that policy shutdown is performed for the 2G network PCF, and the SMF manages the session according to local configuration or subscription information; the session establishment is performed during the 4G access procedure.

1b, a terminal accesses 4G, and in a session modification process, invokes Npcf _ SMPolicyControl _ Update service, where the flow is as shown in fig. 4, an SMF may send a message with a message format of POST to a PCF to request to Update SMPolicy, the PCF replies "200 OK (i.e., Update response message, corresponding to the first session management policy Update response message)", a message body may include a PCC policy and Triggers that trigger policy Update, where the PCC policy includes a policy for 2G access, i.e., an indication parameter indicating that policy shutdown is performed for a 2G network PCF, and the SMF manages a session according to local configuration or subscription information; the session update is performed after the access is completed.

2. The terminal accesses 2G (specifically, during the process of switching from 4G to 2G), the SMF performs session management based on local configuration or subscription information, and invokes a service Npcf _ SMPolicyControl _ Update (corresponding to the second session management policy Update request message) to report to the PCF, as shown in fig. 5, a message body may include smpolicymapptycontextdata (session management policy Update context data), where the message body carries parameters "RAT _ TY _ CH (radio access technology type change)" and "ratType (radio access technology type)", and a parameter value is a 2G radio access type "GERA"; the PCF identifies the 2G information and returns a Response message (i.e. the second session management policy update Response message), which indicates that the PCF rejects issuing the policy, such as "403 Forbidden", where the result value (i.e. the first result value) is carried to indicate 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 may be understood as updating session management related policy procedures when accessing 2G.

Example 2 (corresponding to the second scenario above):

when a terminal initially accesses a 2G network or is switched to the 2G network from a 4G or 5G network (which can also be understood as the process of accessing the 2G network), the SMF initiates an SM Policy establishment or update flow to the PCF, the PCF returns a message to the SMF, the message carries a reason value to indicate that the current PCF is in a Policy shutdown state, and the SMF manages a session according to local configuration or subscription information.

1. Performing the following 1a or 1b operations:

when the terminal initially accesses 2G or switches from 5G to 2G (which can also be understood as 2G access process), the SMF and the PCF interactively establish an SM Policy connection, as shown in fig. 6. The SMF may send a message (i.e., the preset request message) with a message format of POST, where the message carries 2G radio access type information (i.e., a network type to be accessed) "GERA", and after detecting the 2G information, the PCF executes policy shutdown, and returns a Response message (i.e., the preset Response message) to indicate that the SMF manages a session based on local configuration or subscription information, such as "403 Forbidden", where the message carries a cause value indicating that the current terminal is accessed by 2G, such as "GERA" (corresponding to the preset Response message carrying the first sub-information and the second cause value). Fig. 6 may be understood as a terminal establishing an SM Policy connection during a 2G access procedure.

In the process of switching the terminal from 4G to 2G, the Npcf _ SMPolicyControl _ Update (corresponding to the preset request message) service is called, and the flow is as shown in fig. 6, but specific contents (such as specific used values) 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 SMPolicy, wherein the message carries parameters of 'RAT _ TY _ CH' and 'ratType', and the parameter value is 2G wireless access type 'GERA'; the PCF identifies the 2G information, executes policy shutdown, and returns a Response message (i.e. the preset Response message) indicating that the PCF rejects issuing the policy, such as "403 Forbidden", where the cause value carried indicates that the current terminal is accessed by the 2G, such as "GERA" (corresponding to the preset Response message carrying the first sub-information and the second cause value).

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

Example 3 (corresponding to the third scheme above):

when a terminal initially accesses a 2G network or is switched to the 2G network by a 4G or 5G network (which can also be understood as the process of accessing the 2G network), the SMF initiates SM Policy establishment or update flow to the PCF, the PCF makes Policy decision, deactivates part of policies used in the 4G or 5G and sends the policies to the SMF, and the SMF executes the policies according to the policies sent by the PCF.

1. Performing the following 1a or 1b operations:

when the terminal initially accesses 2G or switches from 5G to 2G (which can also be understood as 2G access process), the SMF and the PCF establish SM Policy connection in an interactive manner, as shown in fig. 3, but the POST message and the "201 Created" message have different contents. Specifically, the SMF may send a message (i.e., the preset request message) in a POST format, where the message carries 2G radio access type information "GERA", and the PCF issues a 2G policy (corresponding to the preset response message carrying the second sub-information and the second cause value), where the PCC rule only includes a default rule, and the QoS parameter is a parameter applicable to 2G, and the subscribed Trigger list may be as shown in table 1.

Table 12G Trigger List of PCF subscriptions during Access

In the process of switching the terminal from 4G to 2G, the Npcf _ SMPolicyControl _ Update (corresponding to the preset request message) service is called, and the flow is as shown in fig. 4, but the POST message and the "200 OK" message have different contents. Specifically, the SMF may send a message with a POST format to the PCF to request updating of the SMPolicy, where the message carries parameters "RAT _ TY _ CH" and "ratType", and the parameter value is a 2G radio access type "GERA"; the PCF identifies the 2G information, performs policy decision, and returns "200 OK" (i.e. the preset response message) ", where the message body includes the 2G policy (corresponding to the preset response message carrying the first sub-information and the second cause value), the PCC rule only includes a default rule, and the QoS parameter is a parameter applicable to 2G, and the deactivated Trigger list may be shown in table 2.

Table 22G Trigger list for PCF deactivation on attach

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:

the method comprises the following steps that 1, PCF issues a strategy in advance and indicates that the strategy is executed and stopped aiming at a 2G network, specifically:

(1) the PCF sends the strategy to the SMF when the PCF accesses the non-2G network, wherein the strategy comprises an indication parameter which indicates that the PCF executes strategy shutdown when the terminal is accessed by the 2G network;

(2) SMF identifies 2G access type, executes strategy control according to local configuration or subscription information, and sends POST message to PCF, which contains cell of access network type, and the value is 2G type "GERA";

(3) and the PCF executes the strategy stop and returns a message which does not carry strategy information and only indicates that the PCF knows that the terminal is accessed by the 2G network currently.

After identifying the type of the GERA access network, the PCF executes policy shutdown, issues an instruction, and notifies the SMF to manage the session based on subscription information, specifically:

(1) PCF identifies the GERA access type, makes a decision for the type and decides to execute the strategy shutdown;

(2) PCF returns message to SMF, the message contains a reason value to instruct SMF to execute policy control until switching to 4G or 5G network (i.e. corresponding to the above refusing issue policy and issuing reason value);

(3) and the SMF executes policy control based on local configuration or subscription information, manages the session until monitoring the 4G or 5G access type information, and requests a policy from the PCF again.

3, PCF identifies the type of the GERA access network, and makes policy decision, wherein part of the policy is deactivated, and the SMF manages the session according to the policy issued by the PCF, specifically:

(1) PCF identifies the GERA access type, makes a decision for the type and deactivates part of strategies;

(2) PCF returns 200OK message to SMF, the message carries 2G strategy information, wherein QoS parameter is parameter suitable for 2G.

Therefore, the scheme provided by the embodiment of the invention solves the problem of policy control of 2G network access in 2G, 4G and 5G converged network architectures. In the interoperation process of 2G, 4G and 5G, the PCF executes policy shutdown or partial policy shutdown aiming at the 2G network, and the SMF executes policy control according to the 2G subscription information, so that the session interruption possibly caused by unreasonable parameter mapping executed by the SMF in the prior art is avoided, and meanwhile signaling transmission of an N7 port is saved.

An embodiment of the present invention further provides a policy control apparatus, applied to a policy control function entity, as shown in fig. 7, including:

a first determining module 71, configured to determine policy control information for the 2G network;

a first sending module 72, configured to send the policy control information to a session management function SMF;

The policy control device provided by the embodiment of the invention determines policy control information for a 2G network; sending the policy control information to a Session Management Function (SMF); wherein the policy control information includes first sub information indicating policy shutdown or second sub information indicating a partial policy used in other networks including at least one of a 4G network and a 5G network; in the process of 2G, 4G and 5G interoperation, the PCF executes policy shutdown or partial policy shutdown aiming at the 2G network, so that the SMF can execute policy control according to the 2G subscription information or the policy which is sent by the PCF and is applicable to the 2G, session interruption possibly caused by unreasonable parameter mapping executed by the SMF in the prior art is avoided, and meanwhile signaling transmission of an N7 port is saved; the method well solves the problems that a policy control scheme accessed to the 2G network in the prior art consumes a large amount of signaling and PCF performance, and even causes communication interruption.

Wherein the first sending module comprises: a first sending sub-module, configured to, in a process that a terminal accesses the 4G network, create a response message through a first session management policy, and send the first sub-information to the SMF; or, when the terminal is in the 4G network and session modification is performed, the first sub-information is sent 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, after sending the first sub-information to the SMF, a second session management policy update request message sent by the SMF in a process in which the terminal is switched from the 4G network to the 2G network, where the second session management policy update request message carries first indication information indicating that a type of a network to which the terminal is currently accessed is the 2G network; a first feedback module, configured to feed back, to the SMF, a second session management policy update response message according to the first indication information, where the second session management policy update response message carries second indication information indicating that the issuing of the policy is rejected and a first cause value; and the first reason value indicates that the type of the current network to be accessed by the terminal is a 2G network.

Wherein the first determining module comprises: the first receiving submodule is used for receiving a preset request message sent by the SMF under a preset condition; the preset request message carries third indication information indicating that the type of the current network to be accessed by the terminal is a 2G network; a first determining sub-module, configured to determine, according to the third indication information, the first sub-information or the second sub-information for accessing the 2G network; and executing 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; the preset condition is a condition that the terminal initially accesses a 2G network or a condition that the 5G network is switched to the 2G network, the preset request message is a session management policy creation request message, and the preset response message is a session management policy creation response message; or, the preset condition is a condition 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; and the second reason value indicates that the type of the current network to be accessed by the terminal is a 2G network.

In this 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: at least one of public land mobile network PLMN change information, access type change information, access network charging correlation 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 used resource report information, application traffic start information, application traffic end information, access network information report information, packet switched PS data closed state change information, default quality of service (QoS) change information, Session aggregation maximum bit rate Session-AMBR change information, QoS notification information, identity authentication reallocation information, 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 report information, terminal UE time zone change information, authentication information change information, delay sensitive network bridge information, QoS monitoring information, cell change information, evolved packet System EPS fallback information, multiple access Session information, access network information, service control information, service area change information, access control information, and access control information, and access control information, access control, At least one of 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 implementation embodiments of the policy control method on the policy control function entity side are all applicable to the embodiment of the policy control device, and the same technical effects can be achieved.

An embodiment of the present invention further provides a policy control device, which is applied to a session management function entity, and as shown in fig. 8, the policy control device includes:

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

the first processing module 82 is configured to, when the type of the current network to be accessed by the terminal is a 2G network, perform session management according to the policy control information;

The policy control device provided by the embodiment of the invention receives policy control information aiming at the 2G network, which is sent by a policy control function PCF; under the condition that the type of the current network to be accessed by the terminal is a 2G network, session management is carried out according to the strategy control information; wherein the policy control information includes first sub information indicating policy shutdown or second sub information indicating a partial policy used in other networks including at least one of a 4G network and a 5G network; in the process of 2G, 4G and 5G interoperation, the PCF executes policy shutdown or partial policy shutdown aiming at the 2G network, so that the SMF can execute policy control according to the 2G subscription information or the policy which is sent by the PCF and is applicable to the 2G, session interruption possibly caused by unreasonable parameter mapping executed by the SMF in the prior art is avoided, and meanwhile signaling transmission of an N7 port is saved; the method well solves the problems that a policy control scheme accessed to the 2G network in the prior art consumes a large amount of signaling and PCF performance, and even causes communication interruption.

Wherein the second receiving module comprises: a second receiving submodule, configured to receive the first sub-information sent by the PCF through a first session management policy creation response message in a process that 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 session modification is performed.

Further, the policy control device further includes: a second sending module, configured to send, after receiving the first sub-information sent by the PCF, a second session management policy update request message to the PCF in a process in which the terminal is switched from the 4G network to the 2G network, where the second session management policy update request message carries first indication information indicating that a type of the terminal currently waiting for network access is the 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 second indication information indicating that the policy is rejected to be issued and a first cause value; and the first reason value indicates that the type of the current network to be accessed by the terminal is a 2G network.

In this embodiment of the present invention, the policy control apparatus further includes: a third sending module, configured to send a preset request message to a policy control function PCF under a preset condition before receiving policy control information for a 2G network sent by the PCF; the preset request message carries third indication information indicating that the type of the current network to be accessed by the terminal is a 2G network; the second receiving module includes: a third receiving submodule, configured to receive a preset response message fed back by the PCF according to the third indication information, where the preset response message carries the first sub-information or the second sub-information, and a second cause value; the preset condition is a condition that the terminal initially accesses a 2G network or a condition that the 5G network is switched to the 2G network, the preset request message is a session management policy creation request message, and the preset response message is a session management policy creation response message; or, the preset condition is a condition 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; and the second reason value indicates that the type of the current network to be accessed by the terminal is a 2G network.

Wherein the first processing module comprises: the first processing sub-module is used for carrying out session management according to local policy configuration information or policy subscription information acquired from a preset information storage network element under the condition that the policy control information comprises the first sub-information; or, when the policy control information includes the second sub information, performing session management according to a part of policies indicated in the second sub information.

In this 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: at least one of public land mobile network PLMN change information, access type change information, access network charging correlation 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 used resource report information, application traffic start information, application traffic end information, access network information report information, packet switched PS data closed state change information, default quality of service (QoS) change information, Session aggregation maximum bit rate Session-AMBR change information, QoS notification information, identity authentication reallocation information, 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 report information, terminal UE time zone change information, authentication information change information, delay sensitive network bridge information, QoS monitoring information, cell change information, evolved packet System EPS fallback information, multiple access Session information, access network information, service control information, service area change information, access control information, and access control information, and access control information, access control, At least one of 5G rating group joining IP multicast group information, 5G rating group leaving IP multicast group information, data network name DDN failure information, and DDN transmission status information.

The implementation embodiments of the policy control method on the session management function entity side are all applicable to the embodiment of the policy control device, and the same technical effects can be achieved.

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, and includes: a processor 91 and a transceiver 92;

the processor 91, configured to determine policy control information for a 2G network;

sending the policy control information to a Session Management Function (SMF) through the transceiver 92;

The functional entity provided by the embodiment of the invention determines the policy control information aiming at the 2G network; sending the policy control information to a Session Management Function (SMF); wherein the policy control information includes first sub information indicating policy shutdown or second sub information indicating a partial policy used in other networks including at least one of a 4G network and a 5G network; in the process of interoperation of 2G, 4G and 5G, policy shutdown or partial policy shutdown is executed for a 2G network through the PCF, so that the SMF can execute policy control according to 2G subscription information or a policy which is issued by the PCF and is applicable to 2G, session interruption possibly caused by unreasonable parameter mapping executed by the SMF in the prior art is avoided, and signaling transmission of an N7 port is saved; the method well solves the problems that a policy control scheme accessed to the 2G network in the prior art consumes a large amount of signaling and PCF performance, and even causes communication interruption.

Wherein the processor is specifically configured to: utilizing the transceiver to establish a response message through a first session management policy in the process that the terminal accesses the 4G network, and sending the first sub-information to the SMF; or, the transceiver is utilized 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 session modification is performed.

Further, the processor is further configured to: after the first sub-information is sent to the SMF, receiving, by the transceiver, a second session management policy update request message sent by the SMF in a process in which the terminal is switched from the 4G network to the 2G network, where the second session management policy update request message carries first indication information indicating that a type of a network to which the terminal is currently accessed is the 2G network; feeding back a second session management policy update response message to the SMF through the transceiver according to the first indication information, wherein the second session management policy update response message carries second indication information indicating that the issuing of the policy is refused and a first reason value; and the first reason value indicates that the type of the current network to be accessed by the terminal is a 2G network.

Wherein the processor is specifically configured to: receiving a preset request message sent by the SMF under a preset condition through the transceiver; the preset request message carries third indication information indicating that the type of the current network to be accessed by the terminal is a 2G network; determining the first sub information or the second sub information aiming at accessing a 2G network according to the third indication information; and executing policy shutdown; the processor is specifically configured to: feeding back a preset response message to the SMF through the transceiver, wherein the preset response message carries the first sub information or the second sub information and a second reason value; the preset condition is a condition that the terminal initially accesses a 2G network or a condition that the 5G network is switched to the 2G network, the preset request message is a session management policy creation request message, and the preset response message is a session management policy creation response message; or, the preset condition is a condition 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; and the second reason value indicates that the type of the current network to be accessed by the terminal is a 2G network.

Specifically, the processor is specifically configured to: and determining the second sub information aiming at accessing the 2G network according to the third indication information and the 2G network capability information.

In this 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: at least one of public land mobile network PLMN change information, access type change information, access network charging correlation 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 used resource report information, application traffic start information, application traffic end information, access network information report information, packet switched PS data closed state change information, default quality of service QoS change information, Session aggregation maximum bit rate Session-AMBR change information, QoS notification information, identity authentication reallocation information, 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 report information, terminal UE time zone change information, authentication information change information, delay sensitive network bridge information, QoS monitoring information, cell change information, evolved packet System EPS fallback information, Multi-access Session information, access network information, authentication information, and the like, At least one of 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 implementation embodiments of the policy control method on the policy control function entity side are all applicable to the embodiment of the function entity, and the same technical effects can be achieved.

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, and includes: a processor 101 and a transceiver 102;

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

The functional entity provided by the embodiment of the invention receives the policy control information aiming at the 2G network, which is sent by the policy control function PCF; under the condition that the type of the current network to be accessed by the terminal is a 2G network, session management is carried out according to the strategy control information; wherein the policy control information includes first sub information indicating policy shutdown or second sub information indicating a partial policy used in other networks including at least one of a 4G network and a 5G network; in the process of 2G, 4G and 5G interoperation, the PCF executes policy shutdown or partial policy shutdown aiming at the 2G network, so that the SMF can execute policy control according to the 2G subscription information or the policy which is sent by the PCF and is applicable to the 2G, session interruption possibly caused by unreasonable parameter mapping executed by the SMF in the prior art is avoided, and meanwhile signaling transmission of an N7 port is saved; the method well solves the problems that a policy control scheme accessed to the 2G network in the prior art consumes a large amount of signaling and PCF performance, and even causes communication interruption.

Wherein the processor is specifically configured to: receiving, by the transceiver, the first sub-information sent by the PCF via a first session management policy creation response message in a process of accessing the terminal to the 4G network; or, the PCF receives, through the transceiver, the first sub-information sent by the first session management policy update response message when the terminal is in the 4G network and session modification is performed.

Further, the processor is further configured to: after receiving the first sub-information sent by the PCF, sending a second session management policy updating request message to the PCF through the transceiver in the process that the terminal is switched from the 4G network to the 2G network, wherein the second session management policy updating request message carries first indication information indicating that the type of the current network access to be waited by the terminal is the 2G network; receiving, by the transceiver, a second session management policy update response message fed back by the PCF according to the first indication information, where the second session management policy update response message carries second indication information indicating that issuing of a policy is denied and a first cause value; and the first reason value indicates that the type of the current network to be accessed by the terminal is a 2G network.

In an embodiment of the present invention, the processor is further configured to: before receiving policy control information aiming at a 2G network sent by a policy control function PCF, sending a preset request message to the PCF through the transceiver under a preset condition; the preset request message carries third indication information indicating that the type of the current network to be accessed by the terminal is a 2G network; the processor is specifically configured to: receiving a preset response message fed back by the PCF according to the third indication information through the transceiver, wherein the preset response message carries the first sub-information or the second sub-information and a second reason value; the preset condition is a condition that the terminal initially accesses a 2G network or a condition that the 5G network is switched to the 2G network, the preset request message is a session management policy creation request message, and the preset response message is a session management policy creation response message; or, the preset condition is a condition 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; and the second reason value indicates that the type of the current network to be accessed by the terminal is a 2G network.

Wherein the processor is specifically configured to: under the condition that the policy control information comprises the first sub-information, performing session management according to local policy configuration information or policy subscription information acquired from a preset information storage network element; or, when the policy control information includes the second sub information, performing session management according to a part of policies indicated in the second sub information.

The implementation embodiments of the policy control method on the session management function entity side are all applicable to the embodiment of the session management function entity, and the same technical effect can be achieved.

The embodiment of the invention also provides a functional entity, which comprises a memory, a processor and a program which is stored on the memory and can run on the processor; when the processor executes the program, the policy control method of the policy control function entity side is realized; or, the processor implements the policy control method on the session management function entity side when executing the program.

The implementation embodiments of the policy control method at the policy control function entity side or the session management function entity side are all applicable to the embodiment of the function entity, and the same technical effects can be achieved.

The implementation embodiments of the policy control method at the policy control function entity side or the session management function entity side are all applicable to the embodiment of the readable storage medium, and the same technical effects can be achieved.

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

In embodiments of the invention, the modules/sub-modules may be implemented in software for execution by various types of processors. An identified module of executable code may, for instance, comprise one or more physical or logical blocks of computer instructions which may, for instance, be constructed as an object, procedure, or function. Nevertheless, the executables of an identified module need not be physically located together, but may comprise disparate instructions stored in different bits which, when joined logically together, comprise the module and achieve the stated purpose for the module.

Indeed, a module of executable code may be a single instruction, or many instructions, and may even be distributed over several different code segments, among different programs, and across several memory devices. Likewise, operational data may be identified within the modules and may be embodied 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 partially, merely 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 implemented by software may build a corresponding hardware circuit to implement a corresponding function, without considering cost, and the hardware circuit may include a conventional Very Large Scale Integration (VLSI) circuit or a gate array and an existing semiconductor such as a logic chip, a transistor, 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 or the like.

While the preferred embodiments of the present invention have been described, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims

1. A policy control method is applied to a policy control function entity, and is characterized by comprising the following steps:

determining policy control information for the 2G network;

sending the policy control information to a Session Management Function (SMF);

2. The policy control method according to claim 1, wherein said sending the policy control information to a Session Management Function (SMF) comprises:

3. The policy control method according to claim 2, further comprising, after sending the first sub-message to the SMF:

4. The policy control method according to claim 1, wherein said determining policy control information for accessing a 2G network comprises:

5. The policy control method according to claim 4, wherein said determining the second sub-information for accessing a 2G network according to the third indication information comprises:

6. The policy control method according to any one of claims 1 to 5, wherein in case that the terminal initially accesses a 2G network or is switched from the 5G network to the 2G network, the second sub-information comprises: at least one of public land mobile network PLMN change information, access type change information, access network charging correlation information, identity authentication management session failure information and radio access technology type change information; and/or the presence of a gas in the gas,

when the terminal is switched from the 4G network to the 2G network, the second sub-information comprises: resource modification request information, terminal IP address change information, terminal Session or used resource report information, application traffic start information, application traffic end information, access network information report information, packet switched PS data closed state change information, default quality of service (QoS) change information, Session aggregation maximum bit rate Session-AMBR change information, QoS notification information, identity authentication reallocation information, 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 report information, terminal UE time zone change information, authentication information change information, delay sensitive network bridge information, QoS monitoring information, cell change information, evolved packet System EPS fallback information, multiple access Session information, access network information, service control information, service area change information, access control information, and access control information, and access control information, access control, At least one of 5G rating group joining IP multicast group information, 5G rating group leaving IP multicast group information, data network name DDN failure information, and DDN transmission status information.

7. A policy control method is applied to a session management function entity, and is characterized by comprising the following steps:

8. The policy control method according to claim 7, wherein said receiving policy control information for the 2G network sent by the policy control function PCF comprises:

and receiving the first sub-information sent by the PCF through a first session management strategy updating response message under the condition that the terminal is in the 4G network and session modification is carried out.

9. The policy control method according to claim 8, further comprising, after receiving said first sub-information sent by said PCF:

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:

11. The policy control method according to claim 7, wherein said performing session management according to the policy control information comprises:

12. The policy control method according to any one of claims 7 to 11, wherein in case that the terminal initially accesses a 2G network or is switched from the 5G network to the 2G network, the second sub-information comprises: at least one of public land mobile network PLMN change information, access type change information, access network charging correlation information, identity authentication management session failure information and radio access technology type change information; and/or the presence of a gas in the gas,

13. A policy control device applied to a policy control function entity is characterized by comprising:

14. The policy control device according to claim 13, wherein said first sending module comprises:

15. The policy control device according to claim 14, further comprising:

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

16. The policy control device according to claim 13, wherein said first determining module comprises:

the first sending module includes:

17. The policy control device according to claim 16, wherein said determining the second sub-information for accessing a 2G network according to the third indication information comprises:

18. The policy control device according to any one of claims 13-17, wherein in case that a terminal initially accesses a 2G network or is handed over from the 5G network to the 2G network, the second sub-information comprises: at least one of public land mobile network PLMN change information, access type change information, access network charging correlation information, identity authentication management session failure information and radio access technology type change information; and/or the presence of a gas in the gas,

19. A policy control device applied to a session management function entity is characterized by comprising:

the first processing module is used for carrying out session management according to the strategy control information under the condition that the type of the current network to be accessed by the terminal is a 2G network;

20. The policy control device according to claim 19, wherein said second receiving module comprises:

a second receiving submodule, configured to receive, in a process that a terminal accesses the 4G network, the first sub-information sent by the PCF through a first session management policy creation response message; or,

21. The policy control device according to claim 20, further comprising:

22. The policy control device according to claim 19, further comprising:

the second receiving module includes:

23. The policy control device according to claim 19, wherein said first processing module comprises:

24. The policy control device according to any one of claims 19-23, wherein in case that a terminal initially accesses a 2G network or is handed over from the 5G network to the 2G network, the second sub-information comprises: at least one of public land mobile network PLMN change information, access type change information, access network charging correlation information, identity authentication management session failure information and radio access technology type change information; and/or the presence of a gas in the gas,

25. A functional entity, said functional entity being a policy control functional entity, comprising: a processor and a transceiver;

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

26. A functional entity, said functional entity being a session management functional entity, comprising: a processor and a transceiver;

27. A functional entity comprising a memory, a processor and a program stored on the memory and executable on the processor; wherein the processor implements the policy control method according to any one of claims 1 to 6 when executing the program; or,

the processor, when executing the program, implements a policy control method according to any one of claims 7 to 12.

28. A readable storage medium on which a program is stored, the program realizing the steps in the policy control method according to any one of claims 1 to 6 when executed by a processor; or,

the program when executed by a processor implementing the steps in the policy control method according to any one of claims 7 to 12.