CN108347336A - A kind of policy control session processing method and its device - Google Patents

Abstract

The embodiment of the invention discloses a kind of policy control session processing method and its device, wherein method includes：First strategy execution network elements send the request message for establishing the first policy control session to the first policy control network element；First policy control network element receives request message, and in the case where determining that network switching occurs for the corresponding user equipment of request message, strategic decision-making is carried out according to the policy information of the second policy control session and obtains the policy information of the first policy control session, and the response message for the policy information for carrying the first policy control session is sent to the first strategy execution network elements；First strategy execution network elements receive response message, and message executes the policy information of the first policy control session according to response；The deletion of first the second policy control session of policy control network element control.Using the embodiment of the present invention, solve the problems, such as that 4G switches with the policy control session under 5G intercommunication scenes, it can be ensured that conversation continuity of the user equipment under intercommunication scene.

Description

A kind of policy control session processing method and its device

Technical field

The present invention relates to field of communication technology more particularly to a kind of policy control session processing method and its devices.

Background technology

Policy and charging control (Policy and Charging Control, PCC) framework is enabled an operator to network Resource is monitored, reasonable distribution, and effectively controls the service ability of network, convenient for improving customer service experience, develops simultaneously New tariff policy.

As shown in Figure 1, be the schematic diagram of the PPC frameworks in fourth generation mobile communication technology (4th-Generation, 4G), Including signing information knowledge base (Subscription Profile Repository, SPR), application function (Application Function, AF) network element, online charging system (Online Charging System, OCS), "Policy and Charging Rules Function (Policy and Charging Rule Function, PCRF) network element, bearing binding and event reporting function (Bearer Blinding and Event Report Function, BBERF) network element, strategy and charge execution function (Policy and Charging Enforcement Function, PCEF) network element, flow detection function (Traffic Detection Function, TDF) network elements such as network element, off-line accounting system (Offline Charging System, OFCS).

Wherein, PCRF network elements are the cores of PCC frameworks, carry out the decision of charging and control strategy.Strategy includes：It is based on The charging policy of business data flow/application identities, redirects strategy, bandwidth restriction strategy at gating strategy；Based on business data flow Service quality (Quality of Service, QoS) strategy.In addition, PCRF network elements can also be to PCEF/TDF/BBERF nets The event trigger of first booking reader's equipment (User Equipment, UE), for example, when the position of UE changes, UE connects Network types change, the usage amount of UE changes, PCRF network elements can based on the content that event trigger reports into The corresponding strategic decision-making of row.

PCEF network elements are used to strategy that PCRF network elements issue execute and event trigger reports, main to execute Strategy based on business data flow.PCEF network elements may include the function of TDF network elements and BBERF network elements, and TDF network elements are to PCRF The strategy that network element issues execute and event trigger reports, main to execute strategy based on application identities；BBERF nets Member to strategy that PCRF network elements issue execute and event trigger reports, main to execute based on business data flow Qos policy.In Evolved Packet System (Evolved Packet System, EPS), packet data network gateway (Packet Data Network Gateway, PGW) it is PCEF, gateway (Service Gate Way, SGW) is BBERF.

AF network elements can correspond to third-party application, and the service request of application is issued by Rx interface, for example, media class Type, the stream information of media, qos requirement etc..SPR is read for storing subscription data for PCRF network elements.

When UE is moved in a network, it may occur that the network switching between 2G/3G and 4G, in handoff procedure, need pair The policy information of Existing policies control session is modified and is updated, specifically：UE when accessing 2G/3G, PCEF network elements to Internet Protocol connected reference network (Internet Protocol-Connectivity Access are established in the request of PCRF network elements Network, IP-CAN) session；PCRF network elements establish IP-CAN sessions according to request and issue the policy information of 2G/3G to PCEF Network element；PCEF network elements are when detecting that UE switches to 4G from 2G/3G, to PCRF reported by network elements IP-CAN type altering events； PCRF network elements carry out strategic decision-making based on new IP-CAN types, update policy information；PCRF network elements issue more to PCEF network elements Policy information after new.

Currently, in the research of the PCC frameworks of the 5th third-generation mobile communication technology (5th-Generation, 5G), strategy is determined Plan point is changed to policy control functions (Policy Control Function, PCF) network element, the PCF network element bases by PCRF network elements Strategic decision-making is carried out in utility cession information, operator's configuration and the user contracting data etc. that AF network elements are provided.In addition, being based on The design philosophy of control plane (Control Plane, CP) and user plane (User Plane, UP) separation, user plane unification deployment For UP functional network elements, control plane unification is deployed as CP functional network elements.CP functional network elements may include accessing control and mobile management Function (Access control and Mobility management Function, AMF) module and conversation management functional (Session Management Function, SMF) module.When CP functional network elements receive the policy information from PCF network elements When, instruction UP functional network elements are executed into the strategy.The schematic diagram of PCC frameworks in 5G can be found in Fig. 2, PCF network elements shown in Fig. 2 It is similar with PCRF network elements shown in FIG. 1；CP functional network elements shown in Fig. 2 have merged the function of core network element control plane in EPS, The function of control plane including PCEF, BBERF, TDF shown in FIG. 1；UP functional network elements shown in Fig. 2 have merged core in EPS The function of network element user plane includes the function of the user plane of PCEF, BBERF, TDF shown in FIG. 1；Unified number shown in Fig. 2 It is similar with SPR shown in FIG. 1 according to management (Unified Data Management, UDM) network element, but it includes data not Static signing data are only limitted to, can also include dynamic session data；AF, OCS, OFCS shown in Fig. 2 and AF shown in FIG. 1, OCS, OFCS are identical.

When UE is moved in the range of 4G networks and 5G networks cover simultaneously, to ensure the conversation continuity of UE, will touch Hair UE switches to 5G by 4G or switches to 4G by 5G.But due to the change of PCC frameworks in 5G, the change of core net framework will Policy control network element is caused to switch to PCF network elements by PCRF network elements, strategy execution network elements switch to CP by PCEF network elements (or PGW) Therefore functional network element is not suitable for 4G and 5G intercommunications in the handoff procedure between 2G/3G and 4G to the processing of policy control session Scene.

Invention content

Technical problem to be solved of the embodiment of the present invention is, provides a kind of policy control session processing method and its dress It sets, solves the problems, such as that 4G switches with the policy control session under 5G intercommunication scenes, it can be ensured that user equipment is in intercommunication scene Under conversation continuity.

First aspect of the embodiment of the present invention provides a kind of policy control session processing method and its device, including：

First policy control network element receives the request for establishing the first policy control session that the first strategy execution network elements are sent Message；

If the first policy control network element determines the request message, network switching occurs for corresponding user equipment, The first policy control network element carries out strategic decision-making according to the policy information of the second policy control session and obtains first plan The policy information of session is slightly controlled, second policy control session is to send the request in first strategy execution network elements Before message, the policy control session between the second strategy execution network elements of foundation and the second policy control network element；

The first policy control network element sends to first strategy execution network elements and carries the first policy control meeting The response message of the policy information of words, the response message are used to indicate first strategy execution network elements and execute first plan Slightly control the policy information of session；

The deletion of the second policy control session of the first policy control network element control.

The embodiment of the present invention establishes the first strategy in a first aspect, in the case where determining that network switching occurs for user equipment Session is controlled, deletes the second policy control session, and strategic decision-making is carried out according to the policy information of the second policy control session and is obtained To the policy information of the first policy control session, to realize the switching of 4G and the policy control session under 5G intercommunication scenes, into And ensure conversation continuity of the user equipment under intercommunication scene.

In a kind of mode in the cards, if determining that the request message corresponds in the first policy control network element User equipment network switching occurs, then the first policy control network element according to the policy information of the second policy control session into Before row strategic decision-making obtains the policy information of first policy control session, described in the first policy control network element judgement Whether request message carries network switching instruction message, and the network switching instruction message indicates the corresponding use of the request message Network switching occurs for family equipment；If the request message carries the network switching instruction message, first policy control Network element determines that network switching occurs for the user equipment.Judge whether user equipment occurs net by network switching instruction message Network switches, very simple and convenient.

In a kind of mode in the cards, the first policy control network element determines that the user equipment occurs network and cuts After alternatively, first policy control session is obtained carrying out strategic decision-making according to the policy information of the second policy control session Before policy information, the policy information of second policy control session is obtained, so as to the first strategy execution network elements root Strategic decision-making, which is carried out, according to the policy information of second policy control session obtains the strategy letter of first policy control session Breath.In the case where the first policy control network element and the second policy control network element are independently disposed, first strategy Control network element obtains the policy information of second policy control session to the second policy control network element.In first plan In the case that slightly control network element is set with the second policy control network element conjunction, described in the first policy control network element internal acquisition The policy information of second policy control session.

In a kind of mode in the cards, if determining that the request message corresponds in the first policy control network element User equipment network switching occurs, then the first policy control network element according to the policy information of the second policy control session into Before row strategic decision-making obtains the policy information of first policy control session, the first policy control network element is to data network Whether first acquisition strategy information, switch for the user equipment, and the policy information is different；

The first policy control network element judges whether the policy information includes session activation policy information, the session Activation strategy information includes at least one of Rule Information, event trigger information, user's usage amount monitoring information, the rule Then information includes the charging policy and/or quality of service Qos strategy of business data flow；

If the policy information includes the session activation policy information, described in the first policy control network element determination Policy information is the policy information of second policy control session and network occurs for the corresponding user equipment of the request message The policy information of switching, second policy control session is that the second policy control network element is establishing the second strategy control When session processed, it is updated to the policy information of the data network element.Judge whether user equipment occurs network by policy information Switching, can call data network element, the information for making full use of data network element record, preserving.

In a kind of mode in the cards, the first policy control network element determines the corresponding user of the request message After network switching occurs for equipment, the policy information of carrying first policy control session is sent more to the data network element New information, the strategy letter that the new information is used to indicate the data network element record, preserves first policy control session Breath records at this point, the policy information of second policy control session can be deleted, preserves the first policy control session again Policy information, so that next first policy control network element or the second policy control network element obtain.Sending the new information Afterwards, the first policy control network element receives the update response message that the data network element is sent, and the update response message is used It recorded, preserved in the policy information of instruction first policy control session.

In a kind of mode in the cards, the first policy control network element is determining the corresponding use of the request message After network switching occurs for family equipment switching, control function network element switches over processing, and the functional network element includes application function Network element, flow detection function network element, access net congestion detection function network element, circulation hair support at least one of functional network element.

In a kind of mode in the cards, the first policy control network element is by the second policy control network element Session instruction message is sent to trigger the hand-off process that the second policy control network element carries out functional network element, the session instruction Message is used to indicate first policy control session and has been established, and triggers the second policy control network element and sent out to functional network element Reconstruction instruction message, the reconstruction instruction message is sent to be used to indicate the functional network element and establish and the first policy control network element Between session so that the functional network element switches to and described first from the session between the second policy control network element Session between policy control network element.

In a kind of mode in the cards, the first policy control network element is by triggering the second policy control net Trigger the second policy control network element in the session information interacting channel that member is established between the first policy control network element The hand-off process of functional network element is carried out, the session information interacting channel is used for the second policy control network element by functional network element The business information of input is transmitted to the first policy control network element, and the event that the first policy control network element is inputted Information is reported to be transmitted to the functional network element so that the second policy control network element plays transfer, it is ensured that described first Information transmission between policy control network element and the functional network element.

In a kind of mode in the cards, the response message is additionally operable to trigger the first strategy execution network elements control The deletion of second policy control session.In the first policy control network element and the second policy control network element independent part In the case that administration, first strategy execution network elements are independently disposed with second strategy execution network elements, the response message is used In triggering the first policy control network element session deletion instruction message, the session are sent to second strategy execution network elements It deletes instruction message and is used to indicate the second strategy execution network elements deletion second policy control session, realize described first The deletion of second policy control session described in policy control network element control.In the first policy control network element and second plan Slightly control network element, which closes, sets, in the case that the conjunction of the control plane function of the SMF modules of CP functional network elements and PCEF network elements is set, with the use For family equipment for 4G shifts to 5G, the control plane function that the response message is used to trigger PCEF network elements deletes second strategy Control session.

In a kind of mode in the cards, the new information is additionally operable to trigger second described in the data network element control The deletion of policy control session.It is independently disposed with the second policy control network element in the first policy control network element, is described In the case that first strategy execution network elements are independently disposed with second strategy execution network elements, the new information is for triggering institute It states data network element and sends session deletion instruction message to the second policy control network element, the session is deleted instruction message and is used for It indicates that the second policy control network element deletes second policy control session, realizes the first policy control network element control The deletion of second policy control session.

In a kind of mode in the cards, closed in the first policy control network element and the second policy control network element If, in the case that the control plane function conjunction of the SMF modules of CP functional network elements and PCEF network elements sets, the first policy control network element When receiving the update response message, the second policy control network element described in internal trigger deletes the second policy control meeting Words.

It is only in the first policy control network element and the second policy control network element in a kind of mode in the cards In the case that vertical deployment, first strategy execution network elements are independently disposed with second strategy execution network elements, first plan Slightly control network element deletes instruction message after sending the response message, by sending session to the second policy control network element The deletion of second policy control session is controlled, the session deletes instruction message and is used to indicate the second policy control net Member deletes second policy control session.

In a kind of mode in the cards, closed in the first policy control network element and the second policy control network element If, in the case that the control plane function conjunction of the SMF modules of CP functional network elements and PCEF network elements sets, the first policy control network element After sending the response message, the second policy control network element described in internal trigger deletes second policy control session.

Second aspect of the embodiment of the present invention provides a kind of policy control session processing method, including：

First strategy execution network elements send the request message for establishing the first policy control session to the first policy control network element, The request message is determining the corresponding user equipment generation net of the request message for the first policy control network element In the case that network switches, strategic decision-making is carried out according to the policy information of the second policy control session and obtains first policy control The policy information of session, and the policy information for carrying first policy control session is sent to the first policy control network element Response message, and control the deletion of second policy control session, second policy control session is described first Before strategy execution network elements send the request message, the second strategy execution network elements of foundation and the second policy control network element Between policy control session；

First strategy execution network elements receive the response message；

The strategy that first strategy execution network elements execute first policy control session according to the response message is believed Breath.

Second aspect of the embodiment of the present invention, the request that the first policy control session is established in the transmission of the first strategy execution network elements disappear Breath receives the response message for the policy information for carrying the first policy control session, and message executes the first strategy control according to response The policy information of session processed, to not influence the operation of the user equipment, it is ensured that the continuity of user equipment session.

In a kind of mode in the cards, whether first strategy execution network elements detect the user equipment from described The corresponding core net of second strategy execution network elements switches to the corresponding core net of first strategy execution network elements, and is tied in detection Fruit is that in the case of being, the request message for establishing first policy control session is sent to the first policy control network element, I.e. when the core net of user equipment access changes, sends and established for user equipment to the first policy control network element The first policy control session request message.

In a kind of mode in the cards, the request message carries network switching instruction message, the network switching Instruction message indicates that network switching occurs for the user equipment, so that the first policy control network element can be according to the network Switch indicating information determines that network switching occurs for the user equipment.

In a kind of mode in the cards, first strategy execution network elements are according to response message control described the The deletion of two policy control sessions.

The third aspect of the embodiment of the present invention provides a kind of first policy control network element, including：

Receiving unit, the request for establishing the first policy control session for receiving the transmission of the first strategy execution network elements disappear Breath；

Decision package, if determining the corresponding user equipment hair of the request message for the first policy control network element Network switching is given birth to, then the first policy control network element is obtained according to the progress strategic decision-making of the policy information of the second policy control session To the policy information of first policy control session, second policy control session is in first strategy execution network elements Before sending the request message, the policy control meeting between the second strategy execution network elements of foundation and the second policy control network element Words；

Transmission unit, for sending the strategy for carrying first policy control session to first strategy execution network elements The response message of information, the response message are used to indicate first strategy execution network elements and execute the first policy control meeting The policy information of words；

Control unit, the deletion for controlling the second policy control session.

The first policy control network element that third aspect present invention provides provides for realizing first aspect of the embodiment of the present invention Policy control session processing method in function performed by the first policy control network element.

Fourth aspect of the embodiment of the present invention provides a kind of first strategy execution network elements, including：

Transmission unit, for sending the request message for establishing the first policy control session, institute to the first policy control network element It states request message and is determining the corresponding user equipment generation network of the request message for the first policy control network element In the case of switching, strategic decision-making is carried out according to the policy information of the second policy control session and obtains the first policy control meeting The policy information of words, and the policy information for carrying first policy control session is sent to the first policy control network element Response message, and the deletion of second policy control session is controlled, second policy control session is in first plan Slightly execute before network element sends the request message, the second strategy execution network elements of foundation and the second policy control network element it Between policy control session；

Receiving unit, for receiving the response message；

Execution unit, the policy information for executing first policy control session according to the response message.

The first strategy execution network elements that fourth aspect present invention provides provide for realizing second aspect of the embodiment of the present invention Policy control session processing method in function performed by the first strategy execution network elements.

The 5th aspect of the embodiment of the present invention provides a kind of first policy control network element, including processor and transceiver, is used for It realizes in the policy control session processing method that first aspect of the embodiment of the present invention provides performed by the first policy control network element Function.

The 6th aspect of the embodiment of the present invention provides a kind of first strategy execution network elements, including processor and transceiver, is used for It realizes in the policy control session processing method that second aspect of the embodiment of the present invention provides performed by the first strategy execution network elements Function.

The 7th aspect of the embodiment of the present invention provides a kind of communication system, includes at least the first policy control network element, the first plan Slightly execute network element, the second policy control network element and the second strategy execution network elements.

In embodiments of the present invention, the first strategy execution network elements establish the first strategy control to the transmission of the first policy control network element The request message of session processed, the first policy control network element judge the corresponding user of the first policy control session according to the request message Whether equipment occurs network switching, and in the case where network switching occurs, according to the policy information of the second policy control session It carries out strategic decision-making and obtains the policy information of the first policy control session, the first policy control network element is to the first strategy execution network elements It sends the response message for the policy information for carrying the first policy control session and controls the deletion of the second policy control session, to It realizes the switching of 4G and the policy control session under 5G intercommunication scenes, and then ensures that session of the user equipment under intercommunication scene connects Continuous property.

Description of the drawings

Technical solution in order to illustrate the embodiments of the present invention more clearly or in background technology below will be implemented the present invention Attached drawing illustrates needed in example or background technology.

Fig. 1 is the schematic diagram of the policy charging control architecture in fourth generation mobile communication technology；

Fig. 2 is a kind of schematic diagram of possible policy charging control architecture in the 5th third-generation mobile communication technology；

Fig. 3 is the structural schematic diagram of policy control network element provided in an embodiment of the present invention；

Fig. 4 is the structural schematic diagram of strategy execution network elements provided in an embodiment of the present invention；

Fig. 5 is the communication scheme for the policy control session processing method that the embodiment of the present invention one provides；

Fig. 6 is the communication scheme of policy control session processing method provided by Embodiment 2 of the present invention；

Fig. 7 is the communication scheme for the policy control session processing method that the embodiment of the present invention three provides；

Fig. 8 is the communication scheme for the policy control session processing method that the embodiment of the present invention four provides；

Fig. 9 is the structural schematic diagram of the first policy control network element provided in an embodiment of the present invention；

Figure 10 is the structural schematic diagram of the first strategy execution network elements provided in an embodiment of the present invention.

Specific implementation mode

The embodiment of the present invention is described with reference to the attached drawing in the embodiment of the present invention.

Fig. 1 is referred to, is the schematic diagram of the policy charging control architecture in fourth generation mobile communication technology, the PCC frameworks Including at least eight elements, respectively SPR, AF network element, OCS, PCRF network element, BBERF network elements, PCEF network elements, TDF network elements and OFCS。

Wherein, PCRF network elements are the cores of the PCC frameworks, carry out the decision of charging and control strategy.Strategy includes：Base In the charging policy of business data flow/application identities, gating strategy, redirect strategy, bandwidth restriction strategy；Based on business datum The qos policy of stream.PCRF receives the input from PCEF, SPR and AF, detect, gate about business data flow to PCEF offers, Network control function based on QoS and based on flow based charging (in addition to diameter credit control).In addition, PCRF network elements can also be to PCEF/ TDF/BBERF network elements subscribe to the event trigger of UE, for example, when the position of UE changes, the access network type of UE becomes Change, the usage amount of UE changes, PCRF network elements can carry out corresponding strategy based on the content that event trigger reports and determine Plan.

PCEF network elements, main detection, strategy execution and the billing function based on stream for include business data flow are used for pair The strategy that PCRF network elements issue execute and event trigger reports, main to execute strategy based on business data flow. The network element is located at gateway, such as the PGW of EPS, also can independently dispose.PCEF network elements may include TDF network elements and BBERF network elements Function, TDF network elements to strategy that PCRF network elements issue execute and event trigger reports, main to execute based on answering With the strategy of mark；BBERF network elements to strategy that PCRF network elements issue execute and event trigger reports, and mainly hold Qos policy of the row based on business data flow.In EPS, PGW is PCEF, and SGW is BBERF.

SPR includes with all contracted users or the relevant information of signing, and the signing information that SPR is provided may include signing The charging of business, each priority for allowing business, the QoS information, contracted user's business of contracted user's permission that user allows Relevant information, such as access style, location information and access times；The type etc. of contracted user.SPR may in carrier network Multiple database associations of distribution.

AF network elements can correspond to third-party application, mainly carry out dynamic strategy/charging control to IP-CAN user plane behaviors System.The service request of application is issued by Rx interface, for example, the stream information of medium type, media, qos requirement etc..

OCS provide the credit control function based on user and business data flow, mainly by online acquisition, charging control, batch The module compositions such as valence, management of balance realize online charging function, and coordinate other charging network element equipment (triggering it is dialogue-based, Online charging event request equipment of event etc.) carry out real-time call control.

OFCS provides the billing function based on user and business data flow.Major function includes customer service, service management, meter Take, settle accounts, accounting processing, system administration etc..OFCS is a post-paid processing system for being directed to ticket and account.

When being disposed by multiple PCRF in carrier network, route agent's node (Diameter Routing need to be used Agent, DRA) carry out PCRF addressing.After DRA IP-CAN sessions select PCRF, needing preservation, { UE marks, connect the IP address of UE Access point title (Access Point Name, APN), PCRF marks } information, to ensure the associated session of the same IP-CAN It is routed on the same PCRF.Wherein, IP-CAN is UE to the association between Packet Data Network, general IP address with UE+point Group data network identifies to characterize.

Fig. 2 is referred to, is a kind of schematic diagram of possible policy charging control architecture in the 5th third-generation mobile communication technology, The PCC frameworks include at least 9 elements, respectively UE, access net, CP functional network elements, UP functional network elements, PCF network elements, UDM nets Member, AF network elements, OCS and OFCS.

Wherein, PCF network elements are similar with PCRF network elements shown in FIG. 1；CP functional network elements have merged core network element control in EPS The function in face processed, includes the function of the control plane of PCEF, BBERF, TDF shown in FIG. 1, and CP functional network elements may include AMF modules With SMF modules.UP functional network elements have merged the function of core network element user plane in EPS, including PCEF shown in FIG. 1, The function of the user plane of BBERF, TDF；UDM network elements are similar with SPR shown in FIG. 1, but it includes data be not limited only to it is quiet State subscription data can also include dynamic session data；AF, OCS, OFCS are identical as AF, OCS, OFCS shown in FIG. 1；UE can To include but not limited to the communication equipments such as mobile phone, tablet computer (pad), smartwatch, wearable smart machine, car-mounted terminal； It is the access net under 5G systems to access net, can be Next-Generation networking (Next Generation Radio Access Network, NG RAN), the access net under 4G systems includes evolved base station (evolved Node B, eNB).

Due to the change of the PCC frameworks in 5G systems, policy control network element becomes PCF network elements from PCRF network elements, and strategy is held Row network element becomes CP functional network elements from PCEF network elements (or PGW), therefore, will when UE switches to 5G or 5G from 4G switches to 4G It is related to the change of policy control network element and strategy execution network elements, policy control session can be also varied from.Currently, 2G/3G with Switching between 4G is not related to the change of policy control network element and strategy execution network elements, therefore, the switching between 2G/3G and 4G The scene of 4G and 5G intercommunications are not suitable for the processing of policy control session in the process.

In consideration of it, a kind of policy control session processing method of offer of the embodiment of the present invention and its device, solve 4G and 5G The problem of policy control session under intercommunication scene switches, it can be ensured that conversation continuity of the user equipment under intercommunication scene.

Policy control session processing method provided in an embodiment of the present invention can be applied to the scene that UE switches to 5G from 4G, Or the scene of 4G is switched to from 5G.The scene of 5G is switched to from 4G for UE, the first policy control net in the embodiment of the present invention Member is PCF network elements, and the first strategy execution network elements are CP functional network elements, and the second policy control network element is PCRF network elements, the second strategy It is PCEF network elements or PGW or control plane PGW (PGW-C) to execute network element；The scene of 4G is switched to from 5G for UE, the present invention is implemented Example in the first policy control network element be PCRF network elements, the first strategy execution network elements be PCEF network elements or PGW or PGW-C, second Policy control network element is PCF network elements, and the second strategy execution network elements are CP functional network elements.

It should be noted that PCF network elements can be the network element independently disposed mutually with PCRF network elements, it can also be by PCF nets Member is set as a network element with the conjunction of PCRF network elements and is disposed；CP functional network elements can be the net independently disposed mutually with PCEF network elements The control plane module conjunction of SMF modules and PCEF network elements in CP functional network elements can also be set as a network element and disposed by member. In closing the scene that sets, PCF network elements can correspond to different interfaces from PCRF network elements, between the two also can be by internal circuit or interior Portion's interface is communicated；SMF modules can correspond to different interfaces from the control plane module of PCEF network elements, can also pass through between the two Internal circuit or internal interface are communicated.

Fig. 3 is referred to, is the structural schematic diagram of policy control network element provided in an embodiment of the present invention.Strategy shown in Fig. 3 It can be PCF network elements to control network element 30, can also be PCRF network elements, can also be that PCF network elements are located at together with the conjunction of PCRF network elements Network element.The policy control network element 30 includes processor 301 and transceiver 302.Wherein, processor 301 can be centre Manage device (Central Processing Unit, CPU), general processor, digital signal processor (Digital Signal Processor, DSP), application-specific integrated circuit (Application-Specific Integrated Circuit, ASIC) is existing Field programmable gate array (Field Programmable Gate Array, FPGA) or other programmable logic device, crystal Pipe logical device, hardware component or its arbitrary combination.It is may be implemented or executed in conjunction with described in the disclosure of invention Various illustrative logic blocks, module and circuit.The processor can also be the combination of realization computing function, such as comprising One or more microprocessors combine, the combination etc. of DSP and microprocessor.Transceiver 302 can be transmission circuit, communication mould Block or communication interface etc. can also receive the number that other network elements are sent to other network element transmission datas, signaling, information etc. According to, signaling, information etc., for realizing the transmission between other network elements.

Fig. 4 is referred to, is the structural schematic diagram of strategy execution network elements provided in an embodiment of the present invention.Strategy shown in Fig. 4 It can be CP functional network elements to execute network element 40, can also be PGW network elements or PCEF network elements or PGW-C network elements, can also be CP work( The control plane module of SMF modules and PCEF network elements in energy network element closes the network element being located at together.The strategy execution network elements 40 are wrapped Include processor 401 and transceiver 402.Wherein, processor 301, the transceiver 302 of processor 401, transceiver 402 as shown in figure 3 Similar, details are not described herein.

It should be noted that the policy control session in the embodiment of the present invention is IP-CAN sessions.

Policy control session processing method provided in an embodiment of the present invention is carried out below in conjunction with attached drawing 5- attached drawings 8 detailed It introduces.

Fig. 5 is referred to, is the communication scheme for the policy control session processing method that the embodiment of the present invention one provides, the reality It includes but not limited to following steps to apply example：

Step S101：First strategy execution network elements establish the first policy control session to the transmission of the first policy control network element Request message；

Specifically, first strategy execution network elements pass through first strategy execution network elements and first policy control Interface between network element sends the request message for establishing the first policy control session to the first policy control network element.

Wherein, the request message carries the mark of user equipment, and the mark can include but is not limited to international movement Device identity (International Mobile Equipment Identity, IMEI), international mobile subscriber identity The marks such as (International Mobile Subscriber Identification, IMSI), cell-phone number.For different User equipment, the mark entrained by the request message are different.The first policy control network element and first strategy Different policy control sessions can be established for different user equipmenies between execution network element, the embodiment of the present invention is with a user It is introduced for equipment.

In a kind of mode in the cards, whether first strategy execution network elements detect the user equipment from second The corresponding core net of strategy execution network elements switches to the corresponding core net of first strategy execution network elements, if testing result is It is that then first strategy execution network elements are sent to the first policy control network element establishes the request of the first policy control session and disappear Breath.It can determine that network switching occurs for the user equipment according to the variation of core network access, and then determine and need to change strategy Control session.

If first strategy execution network elements are CP functional network elements, corresponding core net is 5G core nets, CP functions Network element detects whether the user equipment by 4G core nets switches to 5G core nets, and when testing result is to be, to PCF network elements Send the request message for establishing first policy control session.If first strategy execution network elements are PGW, corresponding Core net is 4G core nets, and PGW detects whether the user equipment by 5G core nets switches to 4G core nets, and in testing result When to be, the request message for establishing first policy control session is sent to PCRF network elements.For example, UE is in 4G networks and 5G nets When network moves in the range of covering simultaneously, strong in the possible 5G signal ratio 4G signals of some regions, UE may be cut from 4G core nets Shift to 5G core nets；Strong in the possible 4G signal ratio 5G signals of some regions, UE may switch to 4G core nets from 5G core nets.

For example, UE switches to 5G core nets from 4G core nets, CP functional network elements can be according to mobile management entity (Mobility Management Entity, MME) the forwarding re-positioning request (forward relocation request) that sends judges UE switches to 5G core nets by 4G core nets.Specifically, UE and eNB is interacted, and determines whether UE needs to carry out network by eNB Switching, if desired then eNB sends switching request to MME；MME is sent after receiving switching request to CP functional network elements Forward relocation request, CP functional network elements are according to the source of forward relocation request, really Determine the corresponding network switchings of forward relocation request, i.e., switch to 5G from 4G, so that it is determined that UE is by 4G cores Net switches to 5G core nets.

Optionally, if detecting, the user equipment switches to institute from the corresponding core net of second strategy execution network elements The corresponding core net of the first strategy execution network elements is stated, then first strategy execution network elements carry network in the request message Switch indicating information, the network switching instruction message indicate that network switching occurs for the user equipment, may further indicate that network is cut Type is changed, the network switching type may include switching to 5G by 4G, or switch to 4G by 5G.

The user equipment is held switching to first strategy from the corresponding core net of second strategy execution network elements Before the corresponding core net of row network element, i.e. the user equipment carries out before network switching namely the first strategy execution net Before member sends the request message, establish between the second policy control network element and second strategy execution network elements Second policy control session.If the user equipment switches to 5G from 4G or switches to 4G from 5G, need to delete second plan Session is slightly controlled, first policy control session is established and processing is switched over to other sessions.

In a kind of mode in the cards, first strategy execution network elements access described first in the user equipment When the corresponding core net of strategy execution network elements, first policy control session is established to the first policy control network element transmission Request message.For example, UE is after being switched on or restarting or close offline mode, when accessing 4G core nets or 5G core nets, PGW to PCRF network elements send the request message or CP functional network elements and send the request message to PCF network elements.

Step S102：The first policy control network element receives the request that first strategy execution network elements are sent and disappears Breath；

Specifically, the first policy control network element passes through the first policy control network element and first strategy execution The request message that first strategy execution network elements described in interface between network element are sent.

Step S103：The first policy control network element judges whether the corresponding user equipment of the request message occurs net Network switches；

In a kind of mode in the cards, the first policy control network element judges whether the request message carries institute Network switching instruction message is stated, if the determination result is YES, it is determined that network switching occurs for the user equipment.

After determining that network switching occurs for the user equipment, the first policy control network element obtains second plan Slightly control the policy information of session.In the feelings that the first policy control network element and the second policy control network element are independently disposed Under condition, the first policy control network element obtains the strategy of second policy control session to the second policy control network element Information.In the case where the first policy control network element and the second policy control network element conjunction are set, the first strategy control Network element processed sets network element internal in conjunction and obtains second policy control to the corresponding function module of the second policy control network element The policy information of session.

In a kind of mode in the cards, the first policy control network element when receiving the request message, to Data network element acquisition strategy information.The data network element can be the corresponding data network element of the first policy control network element, institute State the corresponding data network element of the second policy control network element or the corresponding data network element of the first policy control network element and described the The corresponding data network element of one policy control network element carries out closing the data network element set.

In the corresponding data network element of the first policy control network element data corresponding with the first policy control network element It is that UDM network elements obtain to data network element if the first policy control network element is PCF network elements in the case that network element is independently disposed Take policy information；If the first policy control network element is PCRF network elements, to data network element SPR acquisition strategy information.Institute It states the corresponding data network element of the first policy control network element data network element corresponding with the first policy control network element and closes the feelings set Under condition, the data network element acquisition strategy information of Xiang Heshe.

If network switching occurs for the user equipment, the policy information be the user equipment occur network switching it Before, the second policy control network element is updated to the described of the data network element when establishing second policy control session The policy information of second policy control session, i.e., the strategy letter of second policy control session sent to the data network element Breath, at this point, the policy information is the policy information of second policy control session, the policy information includes session activation Policy information, the session activation policy information include Rule Information, event trigger information, user's usage amount monitoring information etc. At least one of information, the Rule Information include the charging policy and/or Qos strategies or the rule of business data flow Information includes at least one of strategies such as the charging policy of business data flow, Qos strategies.

If network switching, first policy control that the request message requests are established do not occur for the user equipment Session is that initial policy controls session, and the policy information includes signing information at this time, and the signing information may include QoS ginsengs The information such as number, charging policy.

Whether the first policy control network element is sentenced including the session activation policy information according to the policy information Whether the user equipment that breaks occurs network switching.It is understood that network switching occurs for the user equipment, then the plan Slightly information includes the session activation policy information；Network switching does not occur for the user equipment, then the policy information includes The signing information.

Step S104：If the determination result is YES, then the first policy control network element according to the second policy control session Policy information carries out strategic decision-making and obtains the policy information of first policy control session；

In a kind of mode in the cards, due to a policy control session and second policy control session Network type it is different, therefore the strategy of the policy information of first policy control session and second policy control session Information is also different, and the policy information of second policy control session cannot be applied in first policy control session In, thus the first policy control network element according to first policy control session to the plan of second policy control session Slightly information carries out strategic decision-making and obtains the policy information of first policy control session.Wherein, strategic decision-making may include reflecting It penetrates, change.

In a kind of mode in the cards, the first policy control network element is (namely described according to the policy information The policy information of second policy control session) first strategy is obtained to first policy control session progress strategic decision-making The policy information of session is controlled, and the policy information of carrying first policy control session is sent more to the data network element New information, the new information record for the data network element, preserve the policy information of first policy control session.Institute Data network element is stated after recording, preserving the policy information of first policy control session, to the first policy control net Member sends update response message, and the update response message is for informing the first policy control network element, first strategy The policy information of control session has been recorded, has been preserved.

Step S105：The first policy control network element sends to first strategy execution network elements and carries first plan The slightly response message of the policy information of control session；

Specifically, the first policy control network element is after the policy information for obtaining first policy control session, The response message for the policy information for carrying first policy control session can be sent to first strategy execution network elements, it is described Response message is used to indicate the policy information that first strategy execution network elements execute first policy control session.

Optionally, the second policy control network element described in the first policy control network element control carries out the switching of functional network element Processing.Wherein, functional network element may include AF network elements shown in fig. 1 or fig. 2, TDF network elements, can also include access net congestion inspection Brake (RAN Congestion Awareness Function, RCAF), circulation hair support function (Traffic Steering Support Function, TSSF) etc. at least one of functional network elements.

In the case where the first policy control network element and the second policy control network element conjunction are set, conjunction sets network element internal It executes and the functional network element being connected with the second policy control network element is gone into the first policy control network element.

In the case where the first policy control network element and the second policy control network element are independently disposed, with UE from 4G It switches to for 5G, for UE before network switching does not occur, the functional network elements such as AF network elements establish session with PCRF network elements, carry out letter Network switching occurs for the transmission of breath, UE, then the information of the functional network elements such as AF network elements input need to be transmitted to PCF network elements, and PCF network elements are defeated The information entered need to be transmitted to the functional network elements such as AF network elements.

In a kind of mode in the cards, the first policy control network element establishes the meeting between the functional network element Words.Specifically, the first policy control network element sends session instruction message, the session to the second policy control network element Instruction message is used to indicate first policy control session and has been established, and triggers the second policy control network element to the work( Can network element send and rebuild instruction message, the reconstructions instruction message be used to indicate the functional network element establish with it is described first tactful Control the session between network element.The reconstruction instruction message may be used to indicate that the functional network element is deleted and second plan Slightly control the session between network element.This kind of mode in the cards needs the first policy control network element and each function network Member establishes session, and signaling is more various, and process is complex, but may insure the timely transmission of information.

In a kind of mode in the cards, the first policy control network element is not established between the functional network element Session, but transfer is carried out by the second policy control network element.The second strategy of first policy control network element triggering control Network element processed establishes the session information interacting channel between the first policy control network element, and the session information interacting channel is used The business information that functional network element inputs is transmitted to the first policy control network element in the second policy control network element, and Information is reported to be transmitted to the functional network element event that the first policy control network element inputs.By taking 4G switches to 5G as an example, PCF network elements establish the session information interacting channel between PCRF network elements, when AF network elements initiate business information modification, PCRF nets Member by the business information after change by the session information interacting channel transfer to PCF network elements, so that PCF network elements generate new rule Then；Information is reported when CP functional network elements send event to PCF network elements, and it is the event ordered by AF network elements that the event, which reports information, Information when, which is reported information by the session information interacting channel transfer to PCRF network elements by PCF network elements, by PCRF nets The event is reported information to be transmitted to AF network elements by member.This kind of mode in the cards without rebuilding session, but needs the second plan Slightly control the forwarding of network element.

Step S106：First strategy execution network elements receive the response message；

Step S107：First strategy execution network elements execute first policy control session according to the response message Policy information；

Step S108, the deletion of the second policy control session of the first policy control network element control；

It should be noted that step S105 can be performed simultaneously with step S108, it can also execute after step S105, also may be used It is executed before step S105.

In a kind of mode in the cards, the response message is additionally operable to trigger the first strategy execution network elements control The deletion of second policy control session.In the first policy control network element and the second policy control network element independent part In the case that administration, first strategy execution network elements are independently disposed with second strategy execution network elements, the response message is used In triggering first strategy execution network elements session deletion instruction message, the session are sent to second strategy execution network elements It deletes instruction message and is used to indicate the second strategy execution network elements deletion second policy control session.In first plan Slightly the conjunction of control network element and the second policy control network element set, the control plane work(of the SMF modules of CP functional network elements and PCEF network elements It can close in the case of setting, by the user equipment for 4G shifts to 5G, the response message is used to trigger the control of PCEF network elements Face function processed deletes second policy control session.

In a kind of mode in the cards, the new information is additionally operable to trigger second described in the data network element control The deletion of policy control session.It is independently disposed with the second policy control network element in the first policy control network element, is described In the case that first strategy execution network elements are independently disposed with second strategy execution network elements, the new information is for triggering institute It states data network element and sends session deletion instruction message to the second policy control network element, the session is deleted instruction message and is used for Indicate that the second policy control network element deletes second policy control session.

In a kind of mode in the cards, closed in the first policy control network element and the second policy control network element If, in the case that the control plane function conjunction of the SMF modules of CP functional network elements and PCEF network elements sets, the first policy control network element When receiving the update response message, the second policy control network element described in internal trigger deletes the second policy control meeting Words.

It is only in the first policy control network element and the second policy control network element in a kind of mode in the cards In the case that vertical deployment, first strategy execution network elements are independently disposed with second strategy execution network elements, first plan Slightly control network element deletes instruction message after sending the response message, by sending session to the second policy control network element Control the deletion of second policy control session, the session deletes instruction message and be used to indicate second policy control Network element deletes second policy control session.

In a kind of mode in the cards, closed in the first policy control network element and the second policy control network element If, in the case that the control plane function conjunction of the SMF modules of CP functional network elements and PCEF network elements sets, the first policy control network element After sending the response message, the second policy control network element described in internal trigger deletes second policy control session.

In Fig. 5 described embodiments one, the first strategy execution network elements establish the to the transmission of the first policy control network element The request message of one policy control session, the first policy control network element judge the first policy control session pair according to the request message Whether the user equipment answered occurs network switching, and in the case where network switching occurs, according to the second policy control session Policy information carries out strategic decision-making and obtains the policy information of the first policy control session, and the first policy control network element is tactful to first The response message that network element sends the policy information for carrying the first policy control session is executed, and controls the second policy control session It deletes, to realize the switching of 4G and the policy control session under 5G intercommunication scenes, and then ensures user equipment in intercommunication scene Under conversation continuity.

Fig. 6 is referred to, is the communication scheme of policy control session processing method provided by Embodiment 2 of the present invention, is implemented The scene that example two switches to 5G for UE from 4G is introduced, and the scene that 4G is switched to from 5G is similar, and distinctive points are tactful control Network element processed, strategy execution network elements are different.It should be noted that embodiment two is introduced by taking PGW as an example, CP hereinafter Function, Policy Control Function, UDM correspond to CP functional network elements, PCF network elements, UDM network elements respectively.Wherein, UDM can also be that UDM and SPR closes the network element after setting.The embodiment includes but not limited to following steps：

Step S201：PGW sends the first request message for establishing the first IP-CAN sessions to PCRF；

Specifically, UE when accessing 4G core nets (without accessing other types of core net before acquiescence UE), PGW to PCRF sends the first request message for establishing the first IP-CAN sessions.First request message carries the mark of UE.

Step S202：PCRF receives the first request message, and carries out strategic decision-making according to the first IP-CAN sessions and obtain the The policy information of one IP-CAN sessions；

Wherein, the policy information of the first IP-CAN sessions includes session activation policy information, session activation policy information Content can be found in one descriptions thereof of embodiment illustrated in fig. 3, and details are not described herein.

Step S203：PCRF sends the first response message to PGW, and the first response message carries the plan of the first IP-CAN sessions Slightly information；

Step S204：PGW receives the first response message, and executes the policy information of the first IP-CAN sessions；

Step S205：PCRF sends the first new information to UDM, and the first new information carries the plan of the first IP-CAN sessions Slightly information；

It should be noted that step S205 can be performed simultaneously with step S203, the priority of two steps execution can not be limited Sequentially.

Step S206：UDM receives the first new information, and records the policy information of the first IP-CAN sessions；

Step S207：UDM sends the first update response message to PCRF；

Wherein, the first update response message is for informing that PCRF, UDM have recorded, preserved the strategy of the first IP-CAN sessions Information.

Step S208：Whether CP Function detections UE accesses 5G core nets；

Specifically, it is access 4G core nets before UE, whether CP Function detections UE by 4G switches to 5G, accesses 5G Core net.CP Function can detect whether UE accesses 5G cores according to the switching request or position updating request that UE is reported Net.

Step S209：If testing result is yes, CP Function are built to Policy Control Function transmissions Second request message of vertical 2nd IP-CAN sessions；

Wherein, second request message carries the mark of UE, identical as the mark of UE that the first request message carries, table Bright first IP-CAN sessions are to be directed to same UE with the 2nd IP-CAN sessions.

Step S210：Policy Control Function receive the second request message；

Step S211：Policy Control Function obtain the policy information of the first IP-CAN sessions to UDM；

Step S212：Policy Control Function determine that UE is sent out according to the policy information of the first IP-CAN sessions Raw network switching；

Specifically, due to being access 4G core nets before UE, the first IP-CAN sessions include session activation policy information, because This can determine that network switching occurs for UE.If what is accessed before UE is 5G core nets, the policy information obtained to UDM includes signing Information, signing information may include the information such as qos parameter.

Step S213：Policy Control Function are according to the 2nd IP- of policy information pair of the first IP-CAN sessions CAN sessions carry out strategic decision-making and obtain the policy information of the 2nd IP-CAN sessions；

Step S214：Policy Control Function send the second new information to UDM, and the second new information is taken Policy information with the 2nd IP-CAN sessions；

Step S215：UDM receives the second new information, and records the policy information of the 2nd IP-CAN sessions；

Specifically, UDM updates the data library when receiving the second new information, i.e., by the strategy of the first IP-CAN sessions Information deletion records the policy information of the 2nd IP-CAN sessions, so that next Policy Control Function are obtained, or When UE switches to 4G by 5G, so that PCRF is obtained.

Step S216：UDM sends the second update response message to Policy Control Function；

Wherein, the first update response message has recorded for informing Policy Control Function, UDM, preserves the The policy information of two IP-CAN sessions.

Step S217：Policy Control Function send the second response message, the second sound to CP Function Message is answered to carry the policy information of the 2nd IP-CAN sessions；

It should be noted that step S213 can be performed simultaneously with step S215, the priority of two steps execution can not be limited Sequentially.

Step S218：CP Function receive the second response message, and execute the policy information of the 2nd IP-CAN sessions；

Step S219：Policy Control Function triggerings PCRF carries out the hand-off process of functional network element；

In a kind of mode in the cards, Policy Control Function send session instruction message to PCRF, It for informing that the 2nd IP-CAN sessions of PCRF have been established, and triggers PCRF and sends reconstruction instruction message to functional network element, reconstruction refers to Show the session that message is used to indicate between functional network element foundation and Policy Control Function, so as to Policy Control Function can be transmitted in functional network element into row information.

In a kind of mode in the cards, the session that Policy Control Function are established between PCRF is believed Interaction channel is ceased, transfer is carried out by information of the PCRF between Policy Control Function and functional network element.

In the case where PCRF and Policy Control Function conjunctions are set, step S219 may not be present, and net is set to close The inside operation of member.

Step S220：Policy Control Function control the deletion of the first IP-CAN sessions；

It should be noted that step S219 can be performed simultaneously with step S220, it can also execute after step S219, also may be used It is executed before step S219.

In a kind of mode in the cards, independently dispose in Policy Control Function and PCRF, CP In the case that Function and PGW are independently disposed, Policy Control Function sent to CP Function second Response message is additionally operable to triggering CP Function and sends session deletion instruction message to PGW, and session deletes instruction message for referring to Show that PGW deletes the first IP-CAN sessions.

In a kind of mode in the cards, Policy Control Function and PCRF conjunction set, CP In the case that SMF and the PGW-C conjunction of Function is set, Policy Control Function sent to CP Function the Two response messages are additionally operable to triggering PGW-C and delete the first IP-CAN sessions.

In a kind of mode in the cards, independently dispose in Policy Control Function and PCRF, CP In the case that Function and PGW are independently disposed, the second new information that Policy Control Function are sent to UDM It is additionally operable to triggering UDM and sends session deletion instruction message to PCRF, session deletes instruction message and is used to indicate PCRF deletions first IP-CAN sessions.

In a kind of mode in the cards, Policy Control Function and PCRF conjunction set, CP In the case that SMF and the PGW-C conjunction of Function is set, Policy Control Function are receiving the second update response When message, internal trigger PCRF deletes the first IP-CAN sessions.

In a kind of mode in the cards, independently dispose in Policy Control Function and PCRF, CP In the case that Function and PGW is independently disposed, Policy Control Function are sending second to CP Function After response message, directly session is sent to PCRF and delete instruction message, session deletes instruction message and is used to indicate PCRF deletions First IP-CAN sessions.

In a kind of mode in the cards, Policy Control Function and PCRF conjunction set, CP In the case that SMF and the PGW-C conjunction of Function is set, Policy Control Function are sending the to CP Function After two response messages, directly triggers PCRF and delete the first IP-CAN sessions.

In Fig. 6 described embodiments two, realize that UE switches the hand-off process of the IP-CAN sessions under 5G scenes from 4G, So that it is guaranteed that the continuity of session.

Fig. 7 is referred to, is the communication scheme for the policy control session processing method that the embodiment of the present invention three provides, implements The scene that example three equally switches to 5G for UE from 4G is introduced, and part identical with embodiment two can be found in embodiment two It specifically describes, details are not described herein.The embodiment includes but not limited to following steps：

Step S301：PGW sends the first request message for establishing the first IP-CAN sessions to PCRF；

Step S302：PCRF receives the first request message, and carries out strategic decision-making according to the first IP-CAN sessions and obtain the The policy information of one IP-CAN sessions；

Step S303：PCRF sends the first response message to PGW, and the first response message carries the plan of the first IP-CAN sessions Slightly information；

Step S304, PGW receives the first response message, and executes the policy information of the first IP-CAN sessions；

Step S305：Whether CP Function detections UE accesses 5G core nets；

Step S306：If testing result is yes, CP Function are built to Policy Control Function transmissions Second request message of vertical 2nd IP-CAN sessions, the second request message carry network switching instruction message；

Wherein, network switching instruction message instruction UE switches to 5G from 4G.

Step S307：Policy Control Function receive the second request message, according to network switching instruction message Determine that network switching occurs for UE；

Step S308：Policy Control Function obtain the policy information of the first IP-CAN sessions to PCRF；

Specifically, the address of PCRF can be pre-configured to be in Policy Control Function, at this time it is believed that net A PCRF is deployed in network, then Policy Control Function obtain the first IP-CAN according to the address of the PCRF The policy information of session.If disposing multiple PCRF in network, Policy Control Function can be addressed by DRA and be obtained The address of the corresponding PCRF of the first IP-CAN sessions is taken, and then obtains the policy information of the first IP-CAN sessions.

Step S309：Policy Control Function are according to the 2nd IP- of policy information pair of the first IP-CAN sessions CAN sessions carry out strategic decision-making and obtain the policy information of the 2nd IP-CAN sessions；

Step S310：Policy Control Function send the second response message, the second sound to CP Function Message is answered to carry the policy information of the 2nd IP-CAN sessions；

Step S311：CP Function receive the second response message, and execute the policy information of the 2nd IP-CAN sessions；

Step S312：Policy Control Function triggerings PCRF carries out the hand-off process of functional network element；

In the case where PCRF and Policy Control Function conjunctions are set, step S312 may not be present, and net is set to close The inside operation of member.

Step S313：Policy Control Function control the deletion of the first IP-CAN sessions；

In Fig. 7 described embodiments three, realize that UE switches the hand-off process of the IP-CAN sessions under 5G scenes from 4G, So that it is guaranteed that the continuity of session.

Fig. 8 is referred to, is the communication scheme for the policy control session processing method that the embodiment of the present invention four provides, implements The scene that example four equally switches to 5G for UE from 4G is introduced, and part identical with embodiment two, embodiment three can be found in Embodiment two, embodiment but specific descriptions, details are not described herein.The embodiment includes but not limited to following steps：

Step S401：PGW sends the first request message for establishing the first IP-CAN sessions to PCRF；

Step S402：PCRF receives the first request message, and carries out strategic decision-making according to the first IP-CAN sessions and obtain the The policy information of one IP-CAN sessions；

Step S403：PCRF sends the first response message to PGW, and the first response message carries the plan of the first IP-CAN sessions Slightly information；

Step S404：PGW receives the first response message, and executes the policy information of the first IP-CAN sessions；

Step S405：Whether CP Function detections UE accesses 5G core nets；

Step S406：If testing result is yes, CP Function are built to Policy Control Function transmissions Second request message of vertical 2nd IP-CAN sessions, the second request message carry network switching instruction message；

Step S407：Policy Control Function receive the second request message；

Step S408：Policy Control Function send the session switching request for functional network element to PCRF；

Wherein, session switching request is used to trigger the session that PCRF terminates itself and all connection network elements, all connection network elements Including functional network element.

Step S409：PCRF receives session switching request；

Step S410：PCRF sends session rebuilding instruction message to functional network element；

Step S411：Functional network element, which receives, rebuilds instruction message；

Step S412：Functional network element establishes the session between Policy Control Function；

Step S413：Policy Control Function carry out strategic decision-making for the 2nd IP-CAN sessions and obtain the The policy information of two IP-CAN sessions；

Step S414：Policy Control Function send the second response message, the second sound to CP Function Message is answered to carry the policy information of the 2nd IP-CAN sessions；

Step S415：CP Function receive the second response message, and execute the policy information of the 2nd IP-CAN sessions

Step S416：Policy Control Function control the deletion of the first IP-CAN sessions；

In a kind of mode in the cards, Policy Control Function sent to CP Function second Response message is additionally operable to triggering CP Function and sends session deletion instruction message to PGW, and session deletes instruction message for referring to Show that PGW deletes the first IP-CAN sessions.

In a kind of mode in the cards, Policy Control Function directly send session to PCRF and delete Instruction message, session delete instruction message and are used to indicate PCRF the first IP-CAN sessions of deletion.

In Fig. 8 described embodiments two, realize that UE switches the hand-off process of the IP-CAN sessions under 5G scenes from 4G, So that it is guaranteed that the continuity of session.

The above-mentioned method for illustrating the embodiment of the present invention, is provided below the device of the embodiment of the present invention.

Fig. 9 is referred to, is a kind of structural schematic diagram of first policy control network element provided in an embodiment of the present invention, this first Policy control network element 90 may include receiving unit 901, decision package 902, transmission unit 903 and control unit 904.Wherein, Each unit is described in detail as follows.

Receiving unit 901, the request for establishing the first policy control session for receiving the transmission of the first strategy execution network elements Message；

Decision package 902, if determining that the corresponding user of the request message sets for the first policy control network element Preparation gives birth to network switching, then the first policy control network element is determined according to the policy information of the second policy control session progress strategy Plan obtains the policy information of first policy control session, and second policy control session is in first strategy execution Before network element sends the request message, the strategy control between the second strategy execution network elements of foundation and the second policy control network element Session processed；

Transmission unit 903 carries first policy control session for being sent to first strategy execution network elements The response message of policy information, the response message are used to indicate first strategy execution network elements and execute the first strategy control The policy information of session processed；

Control unit 904, the deletion for controlling the second policy control session.

Optionally, the first policy control network element 90 further includes judging unit 905, determination unit 906, not in fig.9 It indicates.

Judging unit 905, for judging whether the request message carries network switching instruction message, the network switching Instruction message indicates that network switching occurs for the corresponding user equipment of the request message；

Determination unit 906, if carrying the network switching instruction message for the request message, it is determined that the user Network switching occurs for equipment.

Optionally, the first policy control network element 90 further includes acquiring unit 907, is not indicated in fig.9.

Acquiring unit 907, the policy information for obtaining second policy control session.

Optionally, the acquiring unit 907 is additionally operable to data network element acquisition strategy information；

The judging unit 905 is additionally operable to judge whether the policy information includes session activation policy information, the meeting Words activation strategy information includes at least one of Rule Information, event trigger information, user's usage amount monitoring information, described Rule Information includes the charging policy and/or quality of service Qos strategy of business data flow；

The determination unit 905, if it includes the session activation policy information to be additionally operable to the policy information, it is determined that institute It states the policy information that policy information is second policy control session and net occurs for the corresponding user equipment of the request message Network switches, and the policy information of second policy control session is that the second policy control network element is establishing second strategy When controlling session, it is updated to the policy information of the data network element.

The transmission unit 903 is additionally operable to send the plan for carrying first policy control session to the data network element Slightly the new information of information, the new information are used to indicate the plan that the data network element records first policy control session Slightly information；

The receiving unit 901 is additionally operable to receive the update response message that the data network element is sent, the update response The policy information that message is used to indicate first policy control session has been recorded, has been preserved.

Optionally, described control unit 904 are additionally operable to control function network element and switch over processing, the functional network element packet Application function network element, flow detection function network element, access net congestion detection function network element, circulation hair is included to support in functional network element It is at least one.

Optionally, described control unit 904 is specifically used for controlling the transmission unit 903 to the second policy control network element hair Session instruction message, the session instruction message is sent to be used to indicate first policy control session and have been established, and described in triggering Second policy control network element sends to functional network element and rebuilds instruction message, and the reconstruction instruction message is used to indicate the function network Member establishes the session between the first policy control network element.

Optionally, described control unit 904 is specifically used for the foundation of the second policy control network element of triggering and first strategy The session information interacting channel between network element is controlled, the session information interacting channel will for the second policy control network element The business information of functional network element input is transmitted to the first policy control network element, and the first policy control network element is defeated The event entered reports information to be transmitted to the functional network element.

Optionally, the response message is additionally operable to trigger the first strategy execution network elements control second policy control The deletion of session.

Optionally, the new information is additionally operable to trigger deleting for the second policy control session described in the data network element control It removes.

Optionally, described control unit 904 is specifically used for controlling the transmission unit 903 to the second policy control net Member sends session and deletes instruction message, and the session deletes instruction message and is used to indicate the second policy control network element deletion institute State the second policy control session.

It should be noted that the realization of above-mentioned each unit can also correspond to the phase of embodiment of the method referring to Figure 5 It should describe.Wherein, the receiving unit 901, the transmission unit 903, the acquiring unit 907 can be strategy shown in Fig. 3 Control the transceiver 302 in network element；The decision package 902, described control unit 904, the judging unit 905, it is described really Order member 906 can be the processor 301 in policy control network element shown in Fig. 3.

Figure 10 is referred to, is a kind of structural schematic diagram of first strategy execution network elements provided in an embodiment of the present invention, this One strategy execution network elements 100 may include transmission unit 1001, receiving unit 1002 and execution unit 1003.

Transmission unit 1001, for for sending the request for establishing the first policy control session to the first policy control network element Message, the request message are determining the corresponding user equipment hair of the request message for the first policy control network element In the case of raw network switching, strategic decision-making is carried out according to the policy information of the second policy control session and obtains first strategy The policy information of session is controlled, and sends the strategy for carrying first policy control session to the first policy control network element The response message of information, and the deletion of second policy control session is controlled, second policy control session is described Before first strategy execution network elements send the request message, the second strategy execution network elements of foundation and second policy control Policy control session between network element；

Receiving unit 1002, for receiving the response message；

Execution unit 1003, the policy information for executing first policy control session according to the response message.

Optionally, first strategy execution network elements 100 further include detection unit 1004, are not indicated in Fig. 10.

Detection unit 1004, for whether detecting the user equipment from the corresponding core of second strategy execution network elements Net switches to the corresponding core net of first strategy execution network elements；

If testing result is yes, the transmission unit 1001 establishes the first strategy control to the transmission of the first policy control network element The request message of session processed.

Optionally, the request message carries network switching instruction message, described in the network switching instruction message instruction Network switching occurs for user equipment.

Optionally, first strategy execution network elements 100 further include control unit 1005, are not indicated in Fig. 10.

Control unit 1005, the deletion for controlling second policy control session according to the response message.

It should be noted that the realization of above-mentioned each unit can also correspond to the phase of embodiment of the method referring to Figure 5 It should describe.Wherein, the transmission unit 1001, the receiving unit 1002 can be the receipts in policy control network element shown in Fig. 4 Send out device 402；The execution unit 1003, the detection unit 1004, described control unit 1005 can be strategy control shown in Fig. 4 Processor 401 in network element processed.

Present example also provides a kind of communication system, includes at least policy control network element, the first strategy execution network elements, the Two policy control network elements and the second strategy execution network elements.

In the above-described embodiments, it all emphasizes particularly on different fields to the description of each embodiment, is not described in some embodiment Part, may refer to the associated description of other embodiment.

One of ordinary skill in the art will appreciate that realizing all or part of flow in above-described embodiment method, being can be with Relevant hardware is asked to be completed by computer program, the program can be stored in a computer read/write memory medium In, the program is when being executed, it may include such as the flow of the embodiment of above-mentioned each method.Wherein, the storage medium can be magnetic Dish, CD, read-only memory (Read-Only Memory, ROM) or random access memory (Random Access Memory, RAM) etc..

The above disclosure is only the preferred embodiments of the present invention, cannot limit the right model of the present invention with this certainly It encloses, therefore equivalent changes made in accordance with the claims of the present invention, is still within the scope of the present invention.

Claims (30)

1. a kind of policy control session processing method, which is characterized in that including：

First policy control network element receives the request message for establishing the first policy control session that the first strategy execution network elements are sent；

If the first policy control network element determines that network switching occurs for the corresponding user equipment of the request message, described First policy control network element carries out strategic decision-making according to the policy information of the second policy control session and obtains the first strategy control The policy information of session processed, second policy control session are to send the request message in first strategy execution network elements Before, the policy control session between the second strategy execution network elements of foundation and the second policy control network element；

The first policy control network element sends to first strategy execution network elements and carries first policy control session The response message of policy information, the response message are used to indicate first strategy execution network elements and execute the first strategy control The policy information of session processed；

The deletion of second policy control session described in the first policy control network element control.

If 2. according to the method described in claim 1, it is characterized in that, the first policy control network element determine it is described Network switching occurs for the corresponding user equipment of request message, then the first policy control network element is according to the second policy control session Policy information carry out before strategic decision-making obtains the policy information of first policy control session, further include：

The first policy control network element judges whether the request message carries network switching instruction message, the network switching Instruction message indicates that network switching occurs for the corresponding user equipment of the request message；

If the request message carries the network switching instruction message, the first policy control network element determines the user Network switching occurs for equipment.

3. according to the method described in claim 2, it is characterized in that, the first policy control network element determines the user equipment After network switching occurs, further include：

The first policy control network element obtains the policy information of second policy control session.

If 4. according to the method described in claim 1, it is characterized in that, the first policy control network element determine it is described Network switching occurs for the corresponding user equipment of request message, then the first policy control network element is according to the second policy control session Policy information carry out before strategic decision-making obtains the policy information of first policy control session, further include：

The first policy control network element is to data network element acquisition strategy information；

The first policy control network element judges whether the policy information includes session activation policy information, the session activation Policy information includes at least one of Rule Information, event trigger information, user's usage amount monitoring information, the rule letter Breath includes the charging policy and/or quality of service Qos strategy of business data flow；

If the policy information includes the session activation policy information, the first policy control network element determines the strategy Information is the policy information of second policy control session and network switching occurs for the corresponding user equipment of the request message, The policy information of second policy control session is that the second policy control network element is establishing the second policy control meeting When words, it is updated to the policy information of the data network element.

5. according to the method described in claim 4, it is characterized in that, the first policy control network element determines the request message After network switching occurs for corresponding user equipment, further include：

The first policy control network element sends the policy information for carrying first policy control session to the data network element New information, the plan that the new information is used to indicate data network element record, preserves first policy control session Slightly information；

The first policy control network element receives the update response message that the data network element is sent, and the update response message is used It recorded, preserved in the policy information of instruction first policy control session.

6. according to claim 1-5 any one of them methods, which is characterized in that the method further includes：

The first policy control network element control functional network element switches over processing, and the functional network element includes application function net Member, flow detection function network element, access net congestion detection function network element, circulation hair support at least one of functional network element.

7. according to the method described in claim 6, it is characterized in that, the first policy control network element control functional network element carries out Hand-off process, including：

The first policy control network element sends session instruction message to the second policy control network element, and the session instruction message is used It is had been established in instruction first policy control session, and triggers the second policy control network element and send reconstruction to functional network element Instruction message, the reconstruction instruction message are used to indicate the functional network element and establish between the first policy control network element Session.

8. according to the method described in claim 6, it is characterized in that, the first policy control network element control functional network element carries out Hand-off process, including：

The first policy control network element triggers the second policy control network element and establishes between the first policy control network element Session information interacting channel, what the session information interacting channel inputted functional network element for the second policy control network element Business information is transmitted to the first policy control network element, and will notify in the event of the first policy control network element input Breath is transmitted to the functional network element.

9. according to the method described in claim 1, it is characterized in that, the response message is additionally operable to trigger first strategy and hold The deletion of second policy control session described in row network element control.

10. according to the method described in claim 5, it is characterized in that, the new information is additionally operable to trigger the data network element Control the deletion of second policy control session.

11. according to the method described in claim 1, it is characterized in that, the first policy control network element control the second strategy control The deletion of session processed, including：

The first policy control network element sends session to the second policy control network element and deletes instruction message, and the session is deleted Second policy control session is deleted except instruction message is used to indicate the second policy control network element.

12. a kind of policy control session processing method, which is characterized in that including：

First strategy execution network elements send the request message for establishing the first policy control session to the first policy control network element, described Request message is determining that the corresponding user equipment of the request message occurs network and cut for the first policy control network element In the case of changing, strategic decision-making is carried out according to the policy information of the second policy control session and obtains first policy control session Policy information, and send to the first policy control network element the sound for the policy information for carrying first policy control session Message is answered, and controls the deletion of second policy control session, second policy control session is in first strategy Before executing the network element transmission request message, between the second strategy execution network elements of foundation and the second policy control network element Policy control session；

First strategy execution network elements receive the response message；

First strategy execution network elements execute the policy information of first policy control session according to the response message.

13. according to the method for claim 12, which is characterized in that first strategy execution network elements are to the first policy control Network element transmission is established before the request message of the first policy control session, further includes：

Whether first strategy execution network elements detect the user equipment from the corresponding core of second strategy execution network elements Net switches to the corresponding core net of first strategy execution network elements；

If testing result is yes, first strategy execution network elements execute to the transmission of the first policy control network element and establish the first plan The step of slightly controlling the request message of session.

14. method according to claim 12 or 13, which is characterized in that the request message carries network switching instruction and disappears Breath, the network switching instruction message indicate that network switching occurs for the user equipment.

15. according to the method for claim 12, which is characterized in that the method further includes：

First strategy execution network elements control the deletion of second policy control session according to the response message.

16. a kind of first policy control network element, which is characterized in that including：

Receiving unit, the request message for establishing the first policy control session for receiving the transmission of the first strategy execution network elements；

Decision package, if determining that net occurs for the corresponding user equipment of the request message for the first policy control network element Network switches, then the first policy control network element carries out strategic decision-making according to the policy information of the second policy control session and obtains institute The policy information of the first policy control session is stated, second policy control session is to be sent in first strategy execution network elements Before the request message, the policy control session between the second strategy execution network elements of foundation and the second policy control network element；

Transmission unit, for sending the policy information for carrying first policy control session to first strategy execution network elements Response message, the response message is used to indicate first strategy execution network elements and executes first policy control session Policy information；

Control unit, the deletion for controlling the second policy control session.

17. the first policy control network element according to claim 16, which is characterized in that further include：

Judging unit, for judging whether the request message carries network switching instruction message, the network switching instruction disappears Breath indicates that network switching occurs for the corresponding user equipment of the request message；

Determination unit, if carrying the network switching instruction message for the request message, it is determined that the user equipment hair Raw network switching.

18. the first policy control network element according to claim 17, which is characterized in that further include：

Acquiring unit, the policy information for obtaining second policy control session.

19. the first policy control network element according to claim 16, which is characterized in that

The acquiring unit is additionally operable to data network element acquisition strategy information；

The judging unit is additionally operable to judge whether the policy information includes session activation policy information, the session activation Policy information includes at least one of Rule Information, event trigger information, user's usage amount monitoring information, the rule letter Breath includes the charging policy and/or quality of service Qos strategy of business data flow；

The determination unit, if it includes the session activation policy information to be additionally operable to the policy information, it is determined that the strategy Information is the policy information of second policy control session and network switching occurs for the corresponding user equipment of the request message, The policy information of second policy control session is that the second policy control network element is establishing the second policy control meeting When words, it is updated to the policy information of the data network element.

20. the first policy control network element according to claim 19, which is characterized in that

The transmission unit is additionally operable to send the policy information for carrying first policy control session to the data network element New information, the strategy that the new information is used to indicate the data network element record, preserves first policy control session Information；

The receiving unit is additionally operable to receive the update response message that the data network element is sent, and the update response message is used It recorded, preserved in the policy information of instruction first policy control session.

21. according to claim 16-20 any one of them the first policy control network elements, which is characterized in that

Described control unit is additionally operable to control function network element and switches over processing, the functional network element include application function network element, Flow detection function network element, access net congestion detection function network element, circulation hair support at least one of functional network element.

22. the first policy control network element according to claim 21, which is characterized in that described control unit is specifically used for control It makes the transmission unit and sends session instruction message to the second policy control network element, the session instruction message is used to indicate described First policy control session has been established, and triggers the second policy control network element and send reconstruction instruction message to functional network element, The session rebuild instruction message and be used to indicate between the functional network element foundation and the first policy control network element.

23. the first policy control network element according to claim 21, which is characterized in that described control unit is specifically used for touching It sends out the second policy control network element and establishes and believe the session information interacting channel between the first policy control network element, the session The business information that functional network element inputs is transmitted to first strategy by breath interaction channel for the second policy control network element Network element is controlled, and reports information to be transmitted to the functional network element event that the first policy control network element inputs.

24. the first policy control network element according to claim 16, which is characterized in that the response message is additionally operable to trigger First strategy execution network elements control the deletion of second policy control session.

25. the first policy control network element according to claim 20, which is characterized in that the new information is additionally operable to trigger The deletion of second policy control session described in the data network element control.

26. the first policy control network element according to claim 16, which is characterized in that described control unit is specifically used for control It makes the transmission unit and sends session deletion instruction message to the second policy control network element, instruction message is deleted in the session It is used to indicate the second policy control network element and deletes second policy control session.

27. a kind of first strategy execution network elements, which is characterized in that including：

Transmission unit, it is described to ask for sending the request message for establishing the first policy control session to the first policy control network element Message is asked to determine the corresponding user equipment generation network switching of the request message for the first policy control network element In the case of, strategic decision-making is carried out according to the policy information of the second policy control session and obtains first policy control session Policy information, and the response of the policy information to the first policy control network element transmission carrying first policy control session Message, and the deletion of second policy control session is controlled, second policy control session is to be held in first strategy Before row network element sends the request message, between the second strategy execution network elements of foundation and the second policy control network element Policy control session；

Receiving unit, for receiving the response message；

Execution unit, the policy information for executing first policy control session according to the response message.

28. the first strategy execution network elements according to claim 27, which is characterized in that further include：

Detection unit, for detecting whether the user equipment switches to from the corresponding core net of second strategy execution network elements The corresponding core net of first strategy execution network elements；

If testing result is yes, the transmission unit establishes the first policy control session to the transmission of the first policy control network element Request message.

29. the first strategy execution network elements according to claim 27 or 28, which is characterized in that the request message carries net Network switch indicating information, the network switching instruction message indicate that network switching occurs for the user equipment.

30. the first strategy execution network elements according to claim 27, which is characterized in that further include：

Control unit, the deletion for controlling second policy control session according to the response message.