CN101998513B

CN101998513B - Method and system for controlling policy and charging rules function (PCRF) load balance and redirect diameter routing agent (DRA)

Info

Publication number: CN101998513B
Application number: CN2009101656695A
Authority: CN
Inventors: 周成; 周晓云
Original assignee: ZTE Corp
Current assignee: Haining Yanguan Industrial Investment Co., Ltd
Priority date: 2009-08-14
Filing date: 2009-08-14
Publication date: 2012-12-19
Anticipated expiration: 2029-08-14
Also published as: WO2011018020A1; CN101998513A

Abstract

The invention discloses a method and a system for controlling the PCRF load balance and a redirect DRA. The method comprises: after receiving a diameter establishment request message from a client or V-PCRF not bound with a DRA, the redirect DRA selects a PCRF with a small load as a redirect target PCRF, establishes DRA binding, transmits the identifier or address of the target PCRF to the client or V-PCRF through a diameter response message and, if the load condition of the target PCRF is needed to be updated, loads a PCRF state query instruction in the diameter response message; the client or V-PCRF retransmits a diameter establishment request message carrying the PCRF state query instruction to the target PCRF; and, after receiving the load condition information transmitted by the target PCRF, the client or V-PCRF transmits the load condition information to the redirect DRA.

Description

The method of control PCRF load balancing, system and redirected DRA

Technical field

The present invention relates to the communications field, particularly a kind of method, system and redirected DRA that controls the PCRF load balancing.

Background technology

3GPP (3rd Generation Partnership Project; Third generation partner program) EPS (Evolved Packet System; The grouping system of evolution) by E-UTRAN (Evolved UniversalTerrestrial Radio Access Network; The Universal Terrestrial Radio Access Network of evolution), MME (Mobility Management Entity, mobile management unit), S-GW (Serving Gateway, gateway), P-GW (Packet Data Network Gateway; Grouped data network gateway), HSS (Home Subscriber Server; Home subscriber server), 3GPP aaa server (3GPP authentication and authorization charging server), PCRF (Policy and Charging Rules Function, "Policy and Charging Rules Function) and other support nodes are formed.Wherein, S-GW is the accessing gateway equipment that links to each other with E-UTRAN, between E-UTRAN and P-GW, transmits data, and is responsible for pending datas such as paging are carried out buffer memory; P-GW then is the borde gateway of EPS and PDN (Packet Data Network, Packet Data Network), is responsible for the access of PDN, between EPS and PDN, transmits data etc.; PCRF is through Rx interface and the IP of operator (Internet Protocol; Internet protocol) the business network interface obtains business information, and it links to each other another side with gateway device in the network through the Gx/Gxa/Gxc interface; Be responsible for initiating the foundation that IP carries; Guarantee the QoS (Quality of Service, service quality) of business datum, and the control of chargeing.

In the 3GPP network between the EPS; PCEF (Policy and charging enforcementfunction; Strategy and charge execution function) be present among the P-GW, PCRF passes through Gx interface exchange message as long as be connected the control that can accomplish all functions with P-GW between PCRF and P-GW.Interface when between P-GW and S-GW is based on PMIP (Proxy Mobile IP; Proxy-mobile IP) time; There are bearing binding and event reporting function (Bearer Binding and Event Report Function is called for short BBERF) among the S-GW, pass through Gxc interface exchange message between S-GW and the PCRF.When the non-3GPP network insertion of trusted, the also resident BBERF in the trusted non-3 GPP access network Central Shanxi Plain, between non-3GPP network access gateway of trusted and the PCRF through Gxa interface exchange message.UE (User Equipment; When subscriber equipment) roaming; The S9 interface simultaneously, provides AF (the Application Function of business as the interface of ownership place PCRF with visit ground PCRF for UE; Application function) sends the business information that is used to generate PCC (Policy and Charging Control, policy and charging control) strategy to PCRF through the Rx+ interface.

The PLMN of EPS (Public Land Mobile Network; The public land mobile telephone network) there are a plurality of PCRF nodes in; And all PCRF nodes belong to one or more Diameter (PCRF) territory, and all PCRF in same Diameter (PCRF) territory have identical ability.UE is called an IP-CAN (IP Connectivity AccessNetwork, IP connection access network) session to the connection of PDN network.The PCC strategy of an IP-CAN session is only by a PCRF decision.All be associated with same PCRF in order to ensure relevant all PCEF of an IP-CAN session or BBERF and for this IP-CAN session provides professional AF; EPS has introduced a logic function module DRA (Diameter Routing Agent, Diameter route agent) in each Diameter (PCRF) territory.When UE will be established to the IP-CAN session of a PDN, be that a PCRF is selected in this IP-CAN session by DRA, PCEF, BBERF and the AF relevant with this IP-CAN session (being referred to as client, client) is associated with on the selected PCRF by DRA.PCEF, BBERF and AF set up the Diameter session with the PCRF that chooses respectively, and through these Diameter sessions transmission strategies that session is controlled to IP-CAN and business information etc.Correctly PCEF, BBERF and AF are associated with a PCRF in order to ensure DRA; DRA will preserve and can the relevant information of this IP-CAN session of unique identification identify or the IP address with corresponding PCRF; The information of sign IP-CAN session has NAI (the Network Access Identifier of UE; Network access Identifier), the IP address of UE and UE will insert the APN (Access PointName, Access Point Name) of PDN etc.As PCEF, BBERF and the AF of same IP-CAN session during in the Diameter session of setting up with PCRF, to DRA these information is provided, DRA searches the information of preservation, just can select same PCRF for it.Can preserve the information of the Diameter session that PCEF, BBERF or AF and PCRF set up among the DRA, like the session identification of the Diameter session of setting up etc.DRA just can know that it is the Diameter session that the IP-CAN session is managed like this.When the Diameter session of PCEF, BBERF or AF and PCRF foundation was deleted, PCEF, BBERF or AF will notify DRA this Diameter deletion, and DRA can delete the information (like session identification) of this Diameter session.After being all Diameter session deletion of certain IP-CAN session management as DRA, DRA will delete all information of this IP-CAN session.

The concrete realization of DRA can have three kinds of modes.(1) Redirect (being redirected) mode.When PCEF, BBERF and AF send the Diameter session when setting up request message to PCRF, this message at first is sent out to DRA.If when DRA did not also have the relevant information of this IP-CAN session, DRA can be that a PCRF is selected in this IP-CAN session, and sign or the address of selected PCRF returned to transmit leg; If the relevant information of this IP-CAN session has been arranged among the DAR, then DRA returns to transmit leg with sign or the address of the PCRF of correspondence.Send the Diameter session to selected PCRF again after the address of transmit leg acquisition PCRF or the sign and set up request message.(2) Proxy (agency) mode.When PCEF, BBERF and AF send the Diameter session when setting up request message to PCRF, this message at first is sent out to DRA.If when DRA did not also have the relevant information of this IP-CAN session, DRA can be that a PCRF is selected in this IP-CAN session, and gives selected PCRF with this forwards; If the relevant information of this IP-CAN session has been arranged among the DAR, then DRA gives corresponding PCRF with this forwards, and the affirmation message of PCRF also is transmitted to PCEF, BBERF or AF through DRA.(3) distortion of Proxy mode.Similar with the Proxy mode, difference is that DRA can also send to PCEF, BBERF or AF to the address of PCRF when the affirmation message that forwarding PCRF returns.Like this, in interacting message subsequently, PCEF, BBERF or AF can be directly and PCRF need pass through DRA alternately and not.

For mode (1), the mode that is redirected DRA selection PCRF when creating the DRA binding at present in the standard is at random, does not guarantee the load balancing between each PCRF.Under the condition that does not change existing framework, need a kind of method and make redirected DRA obtain the PCRF load information, utilize dynamic load leveling strategy regulation and control PCRF load balancing.

Summary of the invention

The technical problem that the present invention will solve provides a kind of method, system of the PCRF of control load balancing and is redirected DRA; Make and be redirected the load state information that DRA can obtain PCRF, and newly-built diameter session redirection is arrived the lower PCRF of load according to the load state information of the whole network PCRF.

In order to address the above problem, the invention provides a kind of method of the PCRF of control load balancing, it is characterized in that, comprising:

Being redirected diameter route agent (DRA) receives after the diameter that does not have client (client) that DRA binds or visit ground "Policy and Charging Rules Function (V-PCRF) sets up request message; Select the redirected target P CRF of the lower PCRF conduct of load and create the DRA binding; And sign or the address of said target P CRF sent to said client or said V-PCRF through the diameter response message; Load condition to said target P CRF upgrades if desired, then in said diameter response message, carries PCRF status poll indication;

Said client or said V-PCRF resend diameter according to the sign of said target P CRF or address to said target P CRF and set up request message, and carry said PCRF status poll indication; And after the load state information that receives said target P CRF answer, send it to said redirected DRA.

Further, the load state information of said client or the said V-PCRF said target P CRF that will receive sends to said redirected DRA through the diameter modify request messages.

Further, said method also comprises:

Said redirected DRA is provided with the status poll timer for each PCRF;

And before the sign of said target P CRF or address are sent to said client or said V-PCRF through the diameter response message; Whether the status poll timer of judging this target P CRF is overtime; If overtime, then judgement need be upgraded the load condition of said target P CRF.

Further, said method also comprises:

Said redirected DRA upgrades according to the load condition of this load state information to said target P CRF after receiving the load state information of said target P CRF, and restarts the status poll timer of said target P CRF.

Further, the load state information of said target P CRF is the idle capacity of said target P CRF.

The present invention also provides a kind of system of the PCRF of control load balancing, comprises being redirected DRA, client and PCRF, wherein:

Said redirected DRA is used for; Receive after the diameter that does not have client that DRA binds or visit ground V-PCRF sets up request message; Select the redirected target P CRF of the lower PCRF conduct of load and create the DRA binding; And sign or the address of said target P CRF sent to said client or said V-PCRF through the diameter response message; Load condition to said target P CRF upgrades if desired, then in said diameter response message, carries PCRF status poll indication;

Said client or said visit ground PCRF are used for; After said redirected DRA transmission diameter sets up request message; The sign of the said target P CRF that returns according to said redirected DRA or address resend diameter to said target P CRF and set up request message, and carry said PCRF status poll indication; And, after the load state information that receives said target P CRF answer, send it to said redirected DRA;

Said target P CRF is used for, and receives after the diameter that carries said PCRF status poll indication sets up request message, in the diameter response message of replying, carries its current load state information.

Further, said redirected DRA also is used for:

For each PCRF is provided with the status poll timer;

Before the sign of said target P CRF or address are sent to said client or said V-PCRF through the diameter response message; Whether the status poll timer of judging this target P CRF is overtime; If overtime, then judgement need be upgraded the load condition of said target P CRF.

Further, said redirected DRA also is used for:

After receiving the load state information of said target P CRF, upgrade according to the load condition of this load state information, and restart the status poll timer of said target P CRF said target P CRF.

Further, said client or said V-PCRF are used for, and the load state information of said target P CRF is sent to said redirected DRA through the diameter modify request messages.

Further, the said target P CRF said load state information of in the said diameter response message of replying, carrying is the idle capacity of said target P CRF.

The present invention also provides a kind of redirected DRA of the PCRF of control load balancing, and comprise information receiving and transmitting module, status poll module and be redirected binding module, wherein:

Said information receiving and transmitting module is used for, and after the diameter of V-PCRF sets up request message with receiving client or visit, sends to said redirected binding module; The diameter response message of said status poll and update module transmission is sent to said client or said V-PCRF; And, receive the load state information that comprises said target P CRF after, send it to said status poll and update module;

Said redirected binding module is used for; Receive after the diameter that does not have client that DRA binds or visit ground V-PCRF sets up request message; Select the lower PCRF of load also to create DRA and bind, and will comprise the sign of said target P CRF or the diameter response message of address sends to said status poll module as the target P CRF that is redirected;

Said status poll and update module are used for; When receiving said diameter response message; Load condition to said target P CRF upgrades if desired, then in said diameter response message, carries PCRF status poll indication, and sends to said information receiving and transmitting module; And, receive the load state information of said target P CRF after, according to this load state information said target P CRF load condition is upgraded, and will upgrade the said redirected binding module of result notification.

Further, said status poll and update module further comprise timing unit, status poll unit and state updating unit, and said timing unit links to each other with said status poll unit and said state updating unit respectively;

Said timing unit is used for, for each PCRF is provided with the status poll timer;

Said status poll unit is used for; When receiving said diameter response message; Whether the status poll timer of judging said target P CRF is overtime; If overtime, then judgement need be upgraded the load condition of said target P CRF, and in said diameter response message, carries PCRF status poll indication;

Said state updating unit is used for, receive the load state information of said target P CRF after, according to this load state information said target P CRF load condition is upgraded, and restarts the status poll timer of said target P CRF.

Through technical scheme provided by the invention; On the basis that does not change existing framework; Be implemented under roaming or the non-roaming scene, client or V-PCRF set up and PCRF between the Diameter session time, make DRA can obtain the load information of PCRF; And according to the load state information of the whole network PCRF with newly-built diameter session redirection to the lower PCRF of load, thereby can realize the load balancing between a plurality of PCRF by DRA control.

Description of drawings

Fig. 1 is the roaming Organization Chart of the local route of EPS;

Fig. 2 is the local break-out of EPS and the roaming Organization Chart that home network operator provides IP operation;

Fig. 3 is the local break-out of EPS and the roaming Organization Chart that access zone network operator provides IP operation;

Fig. 4 is the flow chart of the method for the invention embodiment one;

Fig. 5 is the flow chart of the method for the invention embodiment two;

Fig. 6 is the flow chart of the method for the invention embodiment three;

Fig. 7 is the flow chart of the method for the invention embodiment four;

Fig. 8 is the schematic block diagram of the said system embodiment of invention;

Fig. 9 is the schematic block diagram of the said redirected DRA device embodiment of invention.

Embodiment

The present invention proposes a kind of implementation method of the PCRF of control load balancing, is applied to use in the network that is redirected DRA, comprising:

In DRA, to the PCRF among each PLMN the status poll timer is set, be used for periodically triggering the load condition of certain PCRF of DRA inquiry;

DRA is after creating or obtain the DRA binding, if bind the inquiry timer expiry of the PCRF that points to, then DRA carries PCRF status poll indication in the redirect response message of issuing client or V-PCRF (roaming scence);

Client or V-PCRF are carried at the status poll indication in the session foundation/termination request message that mails to target P CRF after receiving the redirect response message that has PCRF status poll indication;

PCRF should carry its present load state information, and be transmitted to DRA again by client or V-PCRF after receiving above-mentioned status poll indication in the response message that returns to client or V-PCRF.

Through above-mentioned method; DRA is after obtaining the whole network PCRF load state information; Obtain the idle capacity ratio of all PCRF according to existing dynamic load leveling algorithm, like this, DRA is when the function of the target P CRF that selects newly-built diameter session; Can newly-built diameter session be directed to the lower PCRF of load, to realize the load balancing of PCRF.

Below in conjunction with accompanying drawing and specific embodiment technical scheme of the present invention is done further explain.

Embodiment one

Present embodiment controls to low load P CRF and sets up the diameter session to be redirected DRA under the non-roaming scene, and to obtain this PCRF state information be that example is explained.Fig. 4 has described client and redirected DRA and PCRF all when belonging area network, triggers the diameter session by external event and sets up flow process, wherein obtains the PCRF load information by DRA and control the diameter session to be established to the lower PCRF of load.But present embodiment is equally applicable to all network elements shown in Figure 4 all in the scene of access zone network.

As shown in Figure 4, each step of this flow process is described below:

Step 401: the client that is redirected DRA receives external trigger (for example request is set up in the IP-CAN session), need set up a diameter session with PCRF;

Step 402:Client sends the diameter foundation request that has user profile (like UE-NAI) to being redirected DRA;

Step 403:DRA preserves user profile get off; And check that current whether the existence bind DRA that should the user, if do not exist, DRA can create a dynamic DRA and bind; Be each UE or PCRF of each IP-CAN appointment; When assigning, DRA can be according to lower PCRF of load of dynamic load leveling policy assignments, and the initial default state of each PCRF is a zero load condition; If exist this user's DRA to bind, DRA can select to bind the PCRF that points to, i.e. PCRF-1 for client;

Step 404: be redirected DRA and return the diameter response message to client, the target that notice client is redirected is PCRF-1.At this moment, if the inquiry timer of the PCRF-1 among the DRA is overtime, then DRA also should carry PCRF status poll indication in the diameter response message;

In this step, if the inquiry timer of the PCRF-1 among the DRA does not have the overtime or overtime stage to send inquiry to PCRF-1 but do not receive response as yet, then DRA does not carry the inquiry indication in the diameter response message;

Step 405:Client resends diameter and sets up request message (with step 402, but having added PCRF status poll indication) to PCRF-1;

Step 406:PCRF-1 replies to diameter response message of client, and has the present load state information (like idle capacity) of PCRF-1;

Step 407: receive the said message of step 406, the state information that client incites somebody to action PCRF-1 wherein sends to redirected DRA through the diameter modify request messages;

Step 408: redirected DRA obtains the state information of PCRF-1 and preserves or renewal, returns the diameter response message to client.DRA restarts the status poll timer of PCRF-1.

So far, DRA has upgraded the load information of PCRF-1, after this according to the idle relatively ratio of all PCRF in the network, with the diameter session redirection of newly-built IP-CAN session to the lower PCRF of load.

Embodiment two

Present embodiment is redirected DRA with ownership place under the roaming scence, and to control to that low load ownership place PCRF sets up the diameter session and obtain this PCRF state information be that example is explained.Fig. 5 has described visit ground PCRF and has been redirected DRA location ownership place PCRF through ownership place, sets up the signaling process of diameter session, and wherein DRA obtains the PCRF load information and controls the diameter session and is established to the lower PCRF of load.

As shown in Figure 5, each step of this signaling process is described below:

Step 501: the V-PCRF on visit ground receives external trigger (for example request is set up in the IP-CAN session), need set up a diameter session through S9 interface and ownership place H-PCRF;

Step 502:V-PCRF sends the Rx/S9 diameter foundation request that has user profile (like UE-NAI) to being redirected H-DRA;

Step 503:H-DRA preserves user profile get off; And check that current whether the existence bind DRA that should the user; If do not exist, H-DRA can create a dynamic DRA binding and (be a UE and assign a PCRF, when assigning; DRA can be according to lower PCRF of load of dynamic load leveling policy assignments, and the initial default state of each PCRF is a zero load condition); If exist this user's DRA to bind, H-DRA can directly select to bind the PCRF that points to, i.e. H-PCRF-1;

Step 504: be redirected H-DRA and return the diameter response message to V-PCRF, the target P CRF that notice V-PCRF is redirected is H-PCRF-1.If the inquiry timer of the H-PCRF-1 among the H-DRA is overtime at this moment, then H-DRA also should carry PCRF status poll indication in the diameter response message;

Step 505:V-PCRF resends diameter and sets up request message (with step 502, but having added PCRF status poll indication) to H-PCRF-1;

Step 506:H-PCRF-1 replies to diameter response message of V-PCRF, and has the present load state information (like idle capacity) of H-PCRF-1;

Step 507: after receiving the said message of step 506, the state information that V-PCRF incites somebody to action H-PCRF-1 wherein sends to H-DRA through the diameter modify request messages;

Step 508:H-DRA obtains the state information of H-PCRF-1 and preserves or renewal, returns the diameter response message to V-PCRF.H-DRA restarts the status poll timer of H-PCRF-1.

So far, H-DRA has upgraded the load information of H-PCRF-1, after this according to the idle relatively ratio of all PCRF in the network, with the diameter session redirection of newly-built IP-CAN session to the lower PCRF of load.

The foregoing description has been described and has been set up in the diameter conversation procedure with PCRF, is obtained the mode of PCRF load state information by DRA control.

In following examples of the present invention; When termination diameter session; Client (under the non-roaming scene) or V-PCRF (under the roaming scence) may send the session termination request to DRA and target P CRF simultaneously; This moment, DRA received the limitation of signaling time-sequence, can't notify client or V-PCRF to go target P CRF to obtain load state information, therefore when client or V-PCRF earlier when DRA sends termination request and wait DRA redirect response; The wait indicating bit should be set in request message, and DRA waits for that in view of the above indicating bit judges whether to utilize this diameter session termination to obtain the PCRF load state information.

Embodiment three

Present embodiment obtains the PCRF load state information with redirected DRA under the non-roaming scene and explains in termination diameter session flow process.Fig. 6 has described the flow process of the client end diameter session of redirected DRA, and wherein DRA gets access to the load information of PCRF through client.Present embodiment is equally applicable to visit the scene of ground client through visit DRA termination diameter session.

As shown in Figure 6, each step is described below:

Step 601:Client receives that external trigger (for example UE or PCRF initiate the IP-CAN session termination) needs the diameter session of termination and PCRF;

Step 602:Client (only for BBERF or PCEF) sends the request of diameter session termination to redirected DRA, if client does not send the session termination request to PCRF simultaneously, also needs in giving the message of DRA, to carry the wait indicating bit;

Step 603: be redirected the DRA checking and exist one DRA that should the IP-CAN session bound really, and with the diameter session tokens of request for terminating.If the granularity that DRA binds is every IP-CAN session, the diameter session of all these IP-CAN sessions all can be terminated so; If the granularity that DRA binds is every user, all diameter sessions of this user all will be terminated so, and the binding of user and PCRF-1 also can be deleted;

Step 604: be redirected DRA and send the diameter redirect response message, confirm that session terminates to client; If the message in the step 602 is provided with the wait indicating bit, the PCRF-1 status poll timer expiry among the DRA, then DRA also needs in the diameter redirect response message, to add PCRF status poll indication;

After step 605:Client receives the response of step 604, send diameter termination request (having the PCRF status poll indication of step 604) to PCRF-1;

Step 606:PCRF-1 beams back diameter response notice client session to client and terminates, has the present load state information (like idle capacity) of PCRF-1 simultaneously in the message;

Step 607:Client uses new specific messages that the state information of the PCRF-1 that receives in the step 606 is transmitted to redirected DRA, and DRA restarts the status poll timer of PCRF-1.

So far, redirected DRA has upgraded the load information of PCRF-1, and after this load state according to all PCRF in the network calculates the idle relatively ratio of PCRF, with the diameter session redirection of newly-built IP-CAN session to the lower PCRF of load.

Embodiment four

Present embodiment obtains ownership place PCRF load state information with the redirected DRA of ownership place under the roaming scence in termination diameter session flow process be that example is explained.It is mutual with redirected DRA of ownership place and ownership place PCRF respectively that Fig. 7 has described visit ground PCRF, the signaling process of termination diameter session.

As shown in Figure 7, each step is described below:

Step 701:V-PCRF receives that external trigger (for example BBERF or PCEF request termination session) needs the diameter session of termination and H-PCRF;

Step 702:V-PCRF is redirected H-DRA to ownership place and sends the request of diameter session termination, if V-PCRF does not send the session termination request to ownership place H-PCRF simultaneously, also need in giving the message of H-DRA, carry the wait indicating bit;

Step 703: be redirected the H-DRA checking and exist one DRA that should the IP-CAN session bound really, and with the diameter session tokens of request for terminating.If all diameter sessions of this user are all terminated, the binding of user and H-PCRF-1 also can be deleted;

Step 704:H-DRA sends the diameter redirect response message to V-PCRF, confirms that session terminates.If the message of step 702 is provided with the wait indicating bit, the H-PCRF-1 status poll timer expiry among the DRA, then H-DRA also needs in the diameter redirect response message, to add PCRF status poll indication;

After step 705:V-PCRF receives the response of step 704, send diameter termination request (having the PCRF status poll indication of step 704) to H-PCRF-1;

Step 706:H-PCRF-1 beams back diameter response notice V-PCRF session to V-PCRF and terminates, has the present load state information (like idle capacity) of H-PCRF-1 simultaneously in the message;

Step 707:V-PCRF uses new specific messages that the state information of the H-PCRF-1 that receives in the step 706 is transmitted to H-DRA, and H-DRA restarts the status poll timer of H-PCRF-1.

So far, redirected H-DRA has upgraded the load information of H-PCRF-1, and after this load state according to all PCRF in the network calculates the idle relatively ratio of PCRF, with the diameter session redirection of newly-built IP-CAN session to the lower PCRF of load.

As shown in Figure 8, a kind of system of the PCRF of control load balancing is provided in the embodiment of the invention, comprise and be redirected DRA, client/V-PCRF and target P CRF, wherein:

Redirected DRA is used for; Receive after the diameter that does not have client that DRA binds or V-PCRF sets up request message; Select the redirected target P CRF of the lower PCRF conduct of load and create the DRA binding; And sign or the address of target P CRF sent to client or V-PCRF through the diameter response message, the load condition to target P CRF upgrades if desired, then in the diameter response message, carries PCRF status poll indication;

Client or V-PCRF are used for, and after redirected DRA sends diameter and sets up request message, resend diameter according to the sign that is redirected the target P CRF that DRA sends or address to target P CRF and set up request message, and carry PCRF status poll indication; And, after the load state information that receives target P CRF answer, send it to and be redirected DRA;

Target P CRF is used for, and receives after the diameter that carries PCRF status poll indication sets up request message, in the diameter response message of replying, carries current load state information.

Further, redirected DRA also is used for:

For each PCRF is provided with the status poll timer;

Before the sign of target P CRF or address are sent to client or V-PCRF through the diameter response message, judge whether the status poll timer of this target P CRF is overtime, if overtime, then judgement need be upgraded the load condition of target P CRF; And

After the load state information that receives target P CRF, upgrade according to the load condition of this load state information, and restart the status poll timer of target P CRF target P CRF.

Further, client or V-PCRF are used for, and the load state information of target P CRF is sent to through the diameter modify request messages be redirected DRA.

Further, the target P CRF load state information of in the diameter response message of replying, carrying is the idle capacity of target P CRF.

As shown in Figure 9, a kind of redirected DRA of the PCRF of control load balancing also is provided in the embodiment of the invention, comprise information receiving and transmitting module, status poll module and be redirected binding module, wherein:

The information receiving and transmitting module is used for, and after the diameter of V-PCRF sets up request message with receiving client or visit, sends to redirected binding module; The diameter response message of status poll and update module transmission is sent to client or V-PCRF; And, receive the load state information that comprises target P CRF after, send it to status poll and update module;

Redirected binding module is used for; Receive after the diameter that does not have client that DRA binds or visit ground V-PCRF sets up request message; Select the lower PCRF of load also to create DRA and bind, and will comprise the sign of target P CRF or the diameter response message of address sends to the status poll module as the target P CRF that is redirected;

Status poll and update module are used for, and when receiving the diameter response message, the load condition to target P CRF upgrades if desired, then in the diameter response message, carry PCRF status poll indication, and send to the information receiving and transmitting module; And, receive the load state information of target P CRF after, according to this load state information target P CRF load condition is upgraded, and will upgrade the said redirected binding module of result notification.

Wherein, status poll and update module further can also comprise timing unit, status poll unit and state updating unit, and timing unit links to each other with status poll unit and state updating unit respectively, wherein:

Timing unit is used for, for each PCRF is provided with the status poll timer;

The status poll unit is used for; When receiving the diameter response message, judge whether the status poll timer of target P CRF is overtime, if overtime; Then judgement need be upgraded the load condition of target P CRF, and in the diameter response message, carries PCRF status poll indication;

State updating unit is used for, receive the load state information of target P CRF after, according to this load state information target P CRF load condition is upgraded, and restarts the status poll timer of target P CRF.

Certainly; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof; Those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.

Claims

1. a method of controlling the PCRF load balancing is characterized in that, comprising:

Being redirected the DRA of diameter route agent receives after the diameter that does not have client client that DRA binds or visit ground "Policy and Charging Rules Function V-PCRF sets up request message; Select the redirected target P CRF of the lower PCRF conduct of load and create the DRA binding; And sign or the address of said target P CRF sent to said client or said V-PCRF through the diameter response message; Load condition to said target P CRF upgrades if desired, then in said diameter response message, carries PCRF status poll indication;

2. the method for claim 1 is characterized in that,

The load state information of the said target P CRF that said client or said V-PCRF will receive sends to said redirected DRA through the diameter modify request messages.

3. according to claim 1 or claim 2 method is characterized in that said method also comprises:

Said redirected DRA is provided with the status poll timer for each PCRF;

4. method as claimed in claim 3 is characterized in that, said method also comprises:

5. according to claim 1 or claim 2 method is characterized in that,

The load state information of said target P CRF is the idle capacity of said target P CRF.

6. a system that controls the PCRF load balancing is characterized in that, comprise being redirected DRA, client and PCRF, wherein:

7. system as claimed in claim 6 is characterized in that, said redirected DRA also is used for:

For each PCRF is provided with the status poll timer;

8. system as claimed in claim 7 is characterized in that, said redirected DRA also is used for:

9. system as claimed in claim 6 is characterized in that,

Said client or said V-PCRF are used for, and the load state information of said target P CRF is sent to said redirected DRA through the diameter modify request messages.

10. like each described system of claim 6 to 9, it is characterized in that,

The said load state information that said target P CRF carries in the said diameter response message of replying is the idle capacity of said target P CRF.

11. a redirected DRA who controls the PCRF load balancing is characterized in that, comprises information receiving and transmitting module, status poll and update module and is redirected binding module, wherein:

Said information receiving and transmitting module is used for, and after the diameter of V-PCRF sets up request message with receiving client or visit, sends to said redirected binding module; The diameter response message of said status poll and update module transmission is sent to said client or said V-PCRF; And, receive the load state information of target P CRF after, send it to said status poll and update module;

Said redirected binding module is used for; Receive after the diameter that does not have client that DRA binds or visit ground V-PCRF sets up request message; Select the lower PCRF of load also to create DRA and bind, and will comprise the sign of said target P CRF or the diameter response message of address sends to said status poll and update module as the target P CRF that is redirected;

12. redirected DRA as claimed in claim 11 is characterized in that,

Said status poll and update module further comprise timing unit, status poll unit and state updating unit, and said timing unit links to each other with said status poll unit and said state updating unit respectively;