CN103139762A - Method and system for selecting policy and charging rule function - Google Patents
Method and system for selecting policy and charging rule function Download PDFInfo
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Abstract
The invention provides a method and system for selecting a policy and charging rule function. The method includes: after a diameter ruling agent (DRA) receives a request message sent by a mobile network element, whether DRA binding exists is found; when the DRA binding does not exist, the policy and charging rule function (PCRF) is selected according to a local internet protocol (IP) address in the request message, and the DRA binding of the request message is built. By means of the method and system, DRA binding is found after the DRA receives the request message sent by the mobile network element, the PCRF is selected according to the local IP address in the request message, and uniformity of selecting of the PCRF of a mobile network and selecting of the PCRF of a fixed network is guaranteed.
Description
Technical field
The present invention relates to moving communicating field, relate in particular to system of selection and the system of a kind of policy control entity (Policy and Charging Rules Function, PCRF).
Background technology
third generation partner program (3rd Generation Partnership Project, 3GPP) the grouping system of evolution (Evolved Packet System, EPS) by universal mobile telecommunications system land radio access web (the Evolved Universal Terrestrial Radio Access Network of evolution, E-UTRAN), mobile management unit (Mobility Management Entity, MME), gateway (Serving Gateway, S-GW), grouped data network gateway (Packet Data Network Gateway, P-GW/PDN GW), home subscriber server (Home Subscriber Server, HSS), authentication and authorization charging (the Authentication of 3GPP, Authorization and Accounting, AAA) server, PCRF and other support nodes form.Fig. 1 is the schematic diagram according to the system architecture of the EPS of correlation technique, and as shown in Figure 1, MME is responsible for the related work of the chains of command such as the processing of mobile management, Non-Access Stratum signaling and the contextual management of user's mobile management; S-GW is the accessing gateway equipment that is connected with E-UTRAN, forwarding data between E-UTRAN and P-GW, and be responsible for the pending datas such as paging are carried out buffer memory; P-GW is the borde gateway of EPS and packet data network (Packet Data Network, PDN) network, is responsible for the access of PDN and the function such as forwarding data between EPS and PDN; S-GW and P-GW belong to the core net gateway; PCRF is the "Policy and Charging Rules Function entity, it is by receiving interface Rx and carrier network agreement (Internet Protocol, IP) business network is connected, obtain business information, in addition, it is connected with gateway device in network by the Gx/Gxa/Gxc interface, be responsible for initiating the foundation of IP carrying, guarantee the service quality (Quality of Service, QoS) of business datum, and carry out charging and control.
EPS supports the intercommunication with non-3GPP IP Access Network, specifically with reference to figure 1, wherein, passes through the S2a/b/c Interface realization with the intercommunication of non-3GPP IP Access Network, and P-GW is as the anchor point between 3GPP and non-3GPP IP Access Network.In Fig. 1, non-3GPP IP Access Network is divided into trusted non-3GPP IP Access Network and trustless non-3GPP IP Access Network.The non-3GPP IP of trusted Access Network can directly be connected with P-GW by the S2a interface; trustless non-3GPP IP Access Network need be through packet data gateway (the Evolved Packet Data Gateway of evolution, ePDG) be connected with P-GW, owing to being fly-by-night access, ePDG is the main safety of being responsible at this moment, interface between ePDG and P-GW is S2b, S2c provides subscriber equipment (User Equipment, UE) to P-GW between relevant control and the mobility support of user's face, the mobility management protocol of its support is for supporting mobile IP v 6 (the Moblie IPv6 Support for Dual Stack Hosts and Routers of two stacks, DSMIPv6).
In EPS, strategy and charge execution function (Policy and Charging Enforcement Function, PCEF) entity are present in P-GW, referring to Fig. 1, pass through Gx interface exchange message between PCRF and P-GW.Interface when between P-GW and S-GW is based on proxy mobile IPv 6 (Proxy Mobile IPv6, PMIPv6) time, S-GW also has bearing binding and event reporting function (Bearer Binding and Event Report Function, BBERF) entity carries out QoS control to business data flow, passes through Gxc interface exchange message between S-GW and PCRF.
When by the access of the non-3GPP connecting system of trusted, the trusted non-3 GPP access network Central Shanxi Plain is resident BBERF also.Pass through Gxa interface exchange message between trusted non-3 GPP access network pass and PCRF.When UE roams, the S9 interface is as the interface of ownership place PCRF and visited place PCRF, Application Function network element (the Application Function of business is provided for UE simultaneously, AF) send for the business information of generating strategy and charging control (Policy and Charging Control, PCC) is tactful to PCRF by Rx interface.
In 3GPP, can find corresponding PDN network by APN (Access Point Name, APN).Usually UE is called an IP to the connection of PDN and connects Access Network (IP Connectivity Access Network, IP-CAN) session.In the process of setting up the IP-CAN session, BBERF and PCEF respectively and set up the Diameter session between PCRF transmit the policy, billing information that this IP-CAN session is controlled and the information that is used for generating strategy etc. by these Diameter sessions.
Corresponding broadband forum (Broadband Forum, BBF) has proposed broadband policy and has controlled framework (Broadband Policy Control Functional, BPCF) with it, and as shown in Figure 2, the BPCF major function is to formulate corresponding strategy; Policy Enforcement Point (Policy Enforcement Point, PEP) usually reside in the fixed network transmission equipment, as broadband remote access servers (Broadband Remote Access Server, BRAS) or broadband gateway (Broadband Network Gateway, BNG), the corresponding strategy of formulating according to BPCF is carried out; Certificate Authority and accounting server (Authentication Authorization and Accounting, AAA) are used for the stored user CAMEL-Subscription-Information.AF is that BPCF generates strategy, and corresponding business information is provided.
Present fixed network mobile fusion (Fixed Mobile Convergence, the FMC) scene paid close attention to very much of operator is namely studied based on 3GPP and BBF are interconnected.Especially for some larger operators, have simultaneously mobile network and fixed broadband network, wishing to provide unified policy control for the user, allow the user can be by different access waies, it is the 3GPP access during as the mobile network, and can be to access by WLAN for fixed network, obtain consistent business experience after access.For unified policy control can be provided, the fusion of PCRF (mobile network's policy control entity) and BPCF (policy control entity of fixed broadband network side) has also been proposed demand many, owing to also how BPCF not being realized carrying out refinement at present, and the planned use PCRF of 3GPP forum realizes the function of BPCF, for convenience of description, the policy control entity of follow-up fusion is unified is PCRF.
When the user commenced business, the user can select the data route is got back to the EPS network (in Fig. 3, Fig. 4, Fig. 5
Line style represents), or directly go out by local fixed network transmission equipment BRAS/BNG, this kind mode is called as WLAN Offload (in Fig. 3, Fig. 4, Fig. 5
Line style represents).
Under the scene that mobile fixed network merges, user can choose WLAN offload mode route data or the data route is got back to the EPS core net, for in this case, the different all connections that also need to guarantee same user can be associated with on same PCRF.At present in the BBF standard, a plurality of policy decision entities have been allowed, but do not define Diameter (the Diameter Routing Agent of route agent, DRA) realize Dynamic Selection, acquiescence is to adopt the mode selection strategy decision entity of static configuration, for example: BRAS/BNG or AAA equipment pass through in the address of local collocation strategy decision entity, according to the direct access strategy decision entity in address of configuration.Therefore, the PCRF that the PCRF that selects when the network element (BRAS/BNG and AAA) of fixed broadband network and mobile network's network element (PCEF, AF and/or ePDG) are selected occurs when inconsistent, the strategy that different PCRF formulates also can produce conflict.
Summary of the invention
In view of this, main purpose of the present invention is to provide system of selection and the system of a kind of PCRF, can guarantee that the PCRF that PCRF that the mobile network selects and fixed network select is consistent.
For achieving the above object, technical scheme of the present invention is achieved in that
The system of selection of a kind of policy control entity (PCRF), described method comprises:
After DRA receives the request message of mobile network's network element transmission, search whether there is the DRA binding;
When not having the DRA binding, select PCRF according to the local ip address in described request message, and create the DRA binding of described request message.
Further, described method also comprises:
When having the DRA binding, select PCRF according to described DRA binding; Wherein, described DRA binds the binding relationship of PCRF and user or user's session request;
The packet data gateway (ePDG) that described mobile network's network element is evolution or policy and charging enforcement function entity (PCEF).
Wherein, select PCRF to be according to the local ip address that carries in described request message:
According to the local ip address that carries in the corresponding relation of pre-configured IP address field and PCRF and described request message, determine the IP address field under described local ip address, PCRF corresponding to described IP address field is defined as selecteed PCRF.
Further, described method also comprises:
Receive the request message of fixed network network element transmission as DRA after, when not having the DRA binding, select PCRF according to the local ip address in described request message, and preserve the address of selected PCRF; Wherein, described fixed network network element is broadband remote access servers (BRAS), broadband gateway (BNG) or Certificate Authority and accounting server (AAA).
Wherein, the DRA of described establishment described request message binds:
When described request message comprises local ip address, preserve the address of selected PCRF and the corresponding relation of described local ip address;
When described request message comprises local ip address and UE ID, preserve the address of selected PCRF and the corresponding relation of described local ip address and UE ID;
When described request message comprises local ip address, UE ID and APN APN, preserve the corresponding relation of selected PCRF and described local ip address, UE ID and APN; Wherein, described local ip address is that fixed network is the public network address of user assignment or RG when being route pattern and network enabled address resolution (NAT), and fixed network is the public network address that RG distributes.
The selective system of a kind of policy control entity PCRF comprises mobile network's network element, and described system also comprises: DRA, after being used for receiving the request message of mobile network's network element transmission, search whether there is the DRA binding; When not having the DRA binding, select PCRF according to the local ip address in described request message, and create the DRA binding of described request message.
Wherein, described DRA also is used for when having the DRA binding, selects PCRF according to described DRA binding; Wherein, described DRA binds the binding relationship of PCRF and user or user's session request;
Described mobile network's network element is ePDG or PCEF.
Wherein, described DRA, concrete local ip address for carrying according to corresponding relation and the described request message of pre-configured IP address field and PCRF is determined the IP address field that described local ip address is affiliated, and PCRF corresponding to described IP address field is defined as selecteed PCRF.
Further, described system also comprises the fixed network network element; Wherein,
Described fixed network network element is BRAS, BNG or AAA;
Described DRA after also being used for receiving the request message of fixed network network element transmission, when not having the DRA binding, selects PCRF according to the local ip address in described request message, and preserves the address of selected PCRF.
Wherein, described DRA, concrete being used for preserved the address of selected PCRF and the corresponding relation of described local ip address when described request message comprises local ip address; When described request message comprises local ip address and UE ID, preserve the address of selected PCRF and the corresponding relation of described local ip address and UE ID; When described request message comprises local ip address, UE ID and APN, preserve the corresponding relation of selected PCRF and described local ip address, UE ID and APN;
Wherein, described local ip address is that fixed network is the public network address of user assignment or RG when being route pattern and network enabled address resolution NAT, and fixed network is the public network address that RG distributes.
The present invention after the request message that receives the transmission of mobile network's network element, searches the DRA binding by DRA, selects PCRF according to the local ip address in request message, has guaranteed that the mobile network selects PCRF and fixed network to select the consistency of PCRF.
Description of drawings
Fig. 1 is the configuration diagram of EPS and non-3GPP IP Access Network;
Fig. 2 is the Organization Chart of the BPCF of BBF proposition;
Fig. 3 is that UE accesses the schematic diagram of EPS core net by trustless S2b mode;
Fig. 4 is that UE accesses the schematic diagram of EPS core net by trustless S2c mode;
Fig. 5 is that UE passes through the schematic diagram that trusted S2c mode accesses the EPS core net;
Fig. 6 is the schematic flow sheet that DRA realizes that by being redirected mode and trunking scheme PCRF selects;
Fig. 7 is the realization flow schematic diagram of the system of selection of PCRF of the present invention;
Fig. 8 is the realization flow schematic diagram of the system of selection embodiment one of PCRF of the present invention;
Fig. 9 is the realization flow schematic diagram of the system of selection embodiment two of PCRF of the present invention;
Figure 10 is the structural representation of the selective system of PCRF of the present invention.
Embodiment
For the scene of user by the fixed network access mobile core net of BBF, for example the WLAN mode accesses, and can segment following three classes:
1, trustless S2b access, as shown in Figure 3, UE is by the fixed network equipment access, set up IP-Sec tunnel transmission data between UE and ePDG, here ePDG serves as security gateway, be linked into the EPS core net by ePDG, S2b interface between ePDG and P-GW can use proxy-mobile IP (Proxy Mobile IP, PMIP) agreement or GPRS Tunnel Protocol (GPRS Tunneling Protocol, GTP), may have the Gxb* interface between ePDG and PCRF, this interface is used for transmitting the tunnel information of user's access.
2, fly-by-night S2c access way, as shown in Figure 4, adopt the DSMIP tunnel this moment between UE and P-GW, and the skin in the DSMIP tunnel also can encapsulate one deck IP-Sec tunnel, and this tunnel is between UE and ePDG, and do not have the tunnel between ePDG and P-GW this moment.
3, S2c access way trusty, as shown in Figure 5, remain DSMIP tunnel between UE and P-GW this moment, but owing to being access relation trusty, do not have ePDG this moment.
For the principle of load balancing, 3GPP forum allows may have a plurality of PCRF in network, and has defined the selection function that middle employing DRA realizes PCRF.When PCEF, ePDG or AF set up session with PCRF for the first time, can be first and DRA mutual, be certain IP-CAN session selection PCRF of this user or this user by DRA, and preserve this user or the incidence relation of this IP-CAN session and PCRF.Follow-up message from other network elements also can be routed on same PCRF, is generated strategy by same PCRF like this, and the conflict that has produced when having avoided different PCRF to generate strategy guarantees tactful consistency.The realization of concrete DRA can be divided into the mode of being redirected and trunking scheme, the specific implementation process as shown in Figure 6, wherein, AAA, BRAS/BNG, ePDG, P-GW (PCEF), AF, TDF etc. can be looked at as the Terminal Server Client in Fig. 6, and PCRF is the remote service end.
Basic thought of the present invention is: after DRA receives the request message of mobile network's network element transmission, search whether there is the DRA binding; When not having the DRA binding, select PCRF according to the local ip address in described request message, and create the DRA binding of described request message.
For making the purpose, technical solutions and advantages of the present invention clearer, by the following examples and with reference to accompanying drawing, the present invention is described in more detail.
Fig. 7 shows the realization flow of the system of selection of PCRF of the present invention, and as shown in Figure 7, described method comprises the steps:
Step 701 after DRA receives the request message of mobile network's network element transmission, searches whether there is the DRA binding, when not having the DRA binding, and execution in step 702; When having the DRA binding, execution in step 703;
Particularly, in this step, described mobile network's network element can be ePDG or PCEF, and wherein PCEF may reside in P-GW.
Step 702 when not having the DRA binding, is selected PCRF according to the local ip address in described request message, and creates the DRA binding of described request message;
Particularly, described DRA binds the binding relationship of PCRF and user or user's session request; Wherein, select PCRF to be according to the local ip address in described request message: according to the local ip address that carries in the corresponding relation of pre-configured IP address field and PCRF and described request message, determine the IP address field that described local ip address is affiliated, PCRF corresponding to described IP address field is defined as selecteed PCRF.
The DRA of described establishment described request message binds: when described request message comprises local ip address, preserve the address of selected PCRF and the corresponding relation of described local ip address; When described request message comprises local ip address and UE ID, preserve the address of selected PCRF and the corresponding relation of described local ip address and UE ID; When described request message comprises local ip address, UE ID and APN APN, preserve the corresponding relation of selected PCRF and described local ip address, UE ID and APN;
Wherein, above-mentioned local ip address is that fixed network is that public network address or the RG of user assignment is route pattern and network enabled address resolution (Network Address Translation, NAT) time, fixed network is the public network address that RG distributes, described UE ID is specifically as follows international mobile subscriber identity (International Mobile Subscriber Identification Number, IMSI) etc.
Step 703 when having the DRA binding, is selected PCRF according to described DRA binding.
In addition, this method can also comprise: receive the request message of fixed network network element transmission as DRA after, when not having the DRA binding, select PCRF according to the local ip address in described request message, and preserve the address of selected PCRF; Wherein, described fixed network network element is BRAS, BNG or AAA.
Fig. 8 shows the realization flow of the system of selection embodiment one of PCRF of the present invention, the working method of the DRA oriented approach of attaching most importance in described embodiment one; Wherein, UE is by WLAN wireless mode access EPS core net, and the situation that this moment, fixed network accessed for perceiving UE.
After UE completed access authentication by fixed communication device, AAA can set up session (optional) to PCRF1, notifies the user to access, and this moment, AAA selected PCRF1 can pass through DRA or static configuration.PCRF1 can set up session to BRAS/BNG, and distributing policy; Perhaps, BRAS/BNG sets up session to PCRF1, request strategy.For rear a kind of mode, BRAS/BNG selects PCRF1 can pass through DRA or static configuration.Follow-up P-GW (PCEF) and ePDG can by DRA select PCRF1 and and PCRF1 set up session.
When DRA receives message from ePDG, PCEF or AAA, BRAS/BNG, if current do not have DRA to bind, DRA is according to a kind of selection PCRF of the local ip address that carries in described message, local ip address+UE ID, local ip address+UEID+APN, and the address of preserving selecteed PCRF.
Step 801, UE completes authenticating and obtaining local ip address by wireless WLAN mode access mobile core net;
Particularly, described local ip address refers to when not having NAT, and fixed network is the public network address of user assignment, maybe when having NAT (RG is route pattern), and fixed network is the public network address that RG distributes.
Step 802 if AAA sets up session to PCRF, and is found PCRF by DRA, and AAA sends the session establishment request to DRA.
Should be appreciated that when AAA need to set up session to PCRF, and be configured to can be by static configuration PCRF address choice PCRF the time, execution in step 805.
Step 803, DRA checks whether there has been the DRA binding, if exist, selects PCRF according to described DRA binding, if do not exist, creates a DRA binding;
Particularly, DRA described here binds: DRA is the binding relationship of certain conversation establishing of PCRF and this user or this user; Described DRA creates a DRA and binds: DRA selects PCRF1 according to local ip address, local ip address+UE ID, local ip address+UE ID+APN, and the address of preserving selecteed PCRF1.
Step 804, DRA replys by session establishment the address that will select to obtain PCRF1 and returns to AAA.
Step 805, AAA sets up session to PCRF1, notice UE access, PCRF1 returns to response to AAA.
It is noted that working as PCRF sets up session to BRAS/BNG, directly execution in step 810.
Step 806, when BRAS/BNG sets up session to PCRF, and BRAS/BNG finds PCRF1 by DRA, BARA/BNG sends the session establishment request to DRA.
Should be appreciated that and when BRAS/BNG sets up session and BRAS/BNG and seeks PCRF by static configuration to PCRF, directly carry out the 9th and go on foot this moment.
Step 807, DRA checks whether there has been the DRA binding, if exist, selects PCRF according to described DRA binding, if do not exist, creates a DRA binding;
Particularly, DRA described here binds: DRA is the binding relationship of certain conversation establishing of PCRF and this user or this user; Described DRA creates a DRA and binds: DRA selects PCRF1 according to local ip address, local ip address+UE ID, local ip address+UE ID+APN, and the address of preserving selecteed PCRF1.
Step 808, DRA replys by session establishment and the address of selecting to obtain PCRF1 is returned to BRAS/BNG.
Step 809, BRAS/BNG sets up session alternately to PCRF1, and PCRF1 returns to response.
Step 810, PCRF1 can be after receiving the conversation informing of AAA, set up session to BRAS/BNG, or BRAS/BNG sets up session to BRAS/BNG when second step perception user accesses, here be linked into three kinds of access waies of mobile network according to the user by fixed network, this step and subsequent step be described respectively:
When access way is fly-by-night S2b mode:
Step 810a, UE initiate the IKEv2 authentication, authentication result ePDG, and after authentication success, UE obtains the IP address that the mobile network distributes.
Step 811a adopts the PMIP agreement between ePDG and P-GW, ePDG initiates gateway control session (Gateway Control Session) and sets up message, carries local ip address information in message.
Should be appreciated that when adopting the GTP agreement between ePDG and P-GW, direct execution in step 815a.
Step 812a, DRA check whether there has been the DRA binding, if exist, select PCRF according to described DRA binding, if do not exist, create a DRA binding;
Particularly, DRA described here binds: DRA is the binding relationship of certain conversation establishing of PCRF and this user or this user; Described DRA creates a DRA and binds: DRA selects PCRF1 according to local ip address, local ip address+UE ID, local ip address+UE ID+APN, and the address of preserving selecteed PCRF1.
Step 813a, DRA reply address from the PCRF1 of selection to ePDG that return to by session establishment.
Step 814a, ePDG and PCRF1 set up gateway control session;
Particularly, ePDG initiates gateway control session to PCRF1, and PCRF1 returns to response to ePDG.
Step 815a adopts the PMIP agreement between ePDG and P-GW, ePDG initiates agent binding update (Proxy Binding Update) message to P-GW;
Adopt the GTP agreement between ePDG and P-GW, ePDG initiates to create conversation request message to P-GW, and can carry local ip address information in message this moment.
Step 816a, P-GW initiate the request of IP-CAN session establishment;
Particularly, adopt the GTP agreement between ePDG and P-GW, also can carry local ip address information in message.
Step 817a, DRA check whether there has been the DRA binding, if exist, select PCRF according to described DRA binding, if do not exist, create a DRA binding;
Particularly, DRA described here binds: DRA is the binding relationship of certain conversation establishing of PCRF and this user or this user; Described DRA creates a DRA and binds: DRA selects PCRF1 according to local ip address, local ip address+UE ID, local ip address+UE ID+APN, and the address of preserving selecteed PCRF1.
When ePDG before completed alternately with DRA, under the PMIP scene, there has been the DRA binding this moment; When ePDG did not complete alternately with DRA, under the GTP scene, DRA need to create DRA binding, and be specially DRA and select PCRF1 according to local ip address, local ip address+UE ID, local ip address+UEID+APN, and the address of preserving selecteed PCRF1.
Step 818a, DRA return to the address of the PCRF1 of selection to P-GW.
Step 819a, P-GW and PCRF1 set up the IP-CAN session;
Be specially, P-GW initiates the request of IP-CAN session establishment to PCRF1, and PCRF1 returns to response to P-GW.
When access way is fly-by-night S2c mode:
Step 810b, UE initiate the IKEv2 authentication, authentication result ePDG, and after authentication success, UE obtains the IP address that the mobile network distributes.
Step 811b, ePDG initiate Gateway Control Session and set up message, also have local ip address information in message.
Step 812b, DRA check whether there has been the DRA binding, if exist, select PCRF according to described DRA binding, if do not exist, create a DRA binding;
Particularly, DRA described here binds: DRA is the binding relationship of certain conversation establishing of PCRF and this user or this user; Described DRA creates a DRA and binds: DRA selects PCRF1 according to local ip address, local ip address+UE ID, local ip address+UE ID+APN, and the address of preserving selecteed PCRF1.
Step 813b, DRA reply address from the PCRF1 of selection to ePDG that return to by session establishment.
Step 814b, ePDG and PCRF1 set up gateway control session;
Particularly, ePDG initiates gateway control session to PCRF1, and PCRF1 returns to response to ePDG.
Step 815b, ePDG sends the IP address by IKEV2 message to UE, and this IP address is the IP address of mobile network's distribution.
Step 816b, UE initiates Binding Update to P-GW.
Step 817b, P-GW initiate the request of IP-CAN session establishment.
Whether step 818b, DRA check has had the DRA binding to exist, and because ePDG before completed alternately with DRA, has had the DRA binding this moment, and DRA selects PCRF1 in the DRA binding.
Step 819b, DRA return to the address of the PCRF1 of selection to P-GW.
Step 820b, P-GW and PCRF1 set up the IP-CAN session;
Particularly, P-GW initiates the request of IP-CAN session establishment to PCRF1, and PCRF1 returns to response to P-GW.
When access way is S2c access way trusty:
Step 810c, UE use IKEV2 to initiate the foundation of Security Association, complete authentication by P-GW to AAA.
Step 811c, UE initiates Binding Update to P-GW, carries the local ip address of UE in message.
Step 812c, P-GW initiate the request of IP-CAN session establishment, carry the local ip address of UE in message.
Step 813c, DRA check whether there has been the DRA binding, if exist, select PCRF according to described DRA binding, if do not exist, create a DRA binding;
Particularly, DRA described here binds: DRA is the binding relationship of certain conversation establishing of PCRF and this user or this user; Described DRA creates a DRA and binds: DRA selects PCRF1 according to local ip address, local ip address+UE ID, local ip address+UE ID+APN, and the address of preserving selecteed PCRF1.
Step 814c, DRA return to the address of the PCRF1 of selection to P-GW.
Step 815c, P-GW initiates the request of IP-CAN session establishment to PCRF1, and PCRF1 returns to response to P-GW, sets up the IP-CAN session.
Should be appreciated that the present embodiment is applicable equally when the DRA working method is trunking scheme.
Fig. 9 shows the realization flow of the system of selection embodiment two of PCRF of the present invention, the working method of the DRA oriented approach of attaching most importance in described embodiment two; Wherein, UE is by WLAN wireless mode access EPS core net, and this moment, fixed network was the situation of the access of not perception UE.
As being route pattern at RG, RG is NAT, and UE authenticates to AAA by mobile network appliance, after UE completes access authentication, AAA can set up session (optional) to PCRF1, notifies the user to access, and this moment, AAA selected PCRF1 can pass through DRA or static configuration.Follow-up P-GW (PCEF) and ePDG can by DRA select PCRF1 and and PCRF1 set up session.
When DRA received message from ePDG, PCEF or AAA, if current do not have a DRA binding, DRA selected PCRF according to local ip address, local ip address+UE ID, local ip address+UE ID+APN, and the address of preserving selecteed PCRF.
Step 901, UE obtains local ip address by wireless WLAN mode access mobile core net;
Particularly, described local ip address can be (RG is route pattern) when having NAT, and fixed network is the public network address that RG distributes.
When access way is fly-by-night S2b access way:
Step 902a, UE initiate the IKEv2 authentication, authentication result ePDG, and after authentication success, UE obtains the IP address that the mobile network distributes.
Step 903a when AAA sets up session to PCRF, and finds PCRF by DRA, and AAA sends the session establishment request to DRA.
Should be appreciated that when AAA need to set up session to PCRF, and be configured to can be by static configuration PCRF address choice PCRF the time, execution in step 906a.
Step 904a, DRA check whether there has been the DRA binding, if exist, select PCRF according to described DRA binding, if do not exist, create a DRA binding;
Particularly, DRA described here binds: DRA is the binding relationship of certain conversation establishing of PCRF and this user or this user; Described DRA creates a DRA and binds: DRA selects PCRF1 according to local ip address, local ip address+UE ID, local ip address+UE ID+APN, and the address of preserving selecteed PCRF1.
Step 905a, the address that DRA replys by session establishment the PCRF1 that will select returns to AAA.
Step 906a, AAA sets up session to PCRF1, notice UE access, PCRF1 returns to response to AAA.
Step 907a adopts the PMIP agreement between ePDG and P-GW, ePDG initiates GatewayControl Session and sets up message, carries local ip address information in message.
Should be appreciated that and adopt the GTP agreement between ePDG and P-GW, direct execution in step 915a.
Step 908a, DRA check whether there has been the DRA binding, if exist, select PCRF according to described DRA binding, if do not exist, create a DRA binding;
Particularly, DRA described here binds: DRA is the binding relationship of certain conversation establishing of PCRF and this user or this user; Described DRA creates a DRA and binds: DRA selects PCRF1 according to local ip address, local ip address+UE ID, local ip address+UE ID+APN, and the address of preserving selecteed PCRF1.
Step 909a, DRA reply address from the PCRF1 of selection to ePDG that return to by session establishment.
Step 910a, ePDG initiates gateway control session to PCRF1, and PCRF1 returns to response to ePDG, sets up gateway control session.
Step 911a adopts the PMIP agreement between ePDG and P-GW, ePDG initiates Proxy Binding Update message to P-GW;
Adopt the GTP agreement between ePDG and P-GW, ePDG initiates to create conversation request message to P-GW, and can carry local ip address information in message this moment.
Step 912a, P-GW initiate the request of IP-CAN session establishment;
Particularly, adopt the GTP agreement between ePDG and P-GW, can carry local ip address information in message.
Step 913a, DRA check whether there has been the DRA binding, if exist, select PCRF according to described DRA binding, if do not exist, create a DRA binding;
Particularly, DRA described here binds: DRA is the binding relationship of certain conversation establishing of PCRF and this user or this user; Described DRA creates a DRA and binds: DRA selects PCRF1 according to local ip address, local ip address+UE ID, local ip address+UE ID+APN, and the address of preserving selecteed PCRF1.
When ePDG before completed alternately with DRA, under the PMIP scene, there has been the DRA binding this moment; When ePDG did not complete alternately with DRA, under the GTP scene, DRA need to create DRA binding, and be specially DRA and select PCRF1 according to local ip address, local ip address+UE ID, local ip address+UEID+APN, and the address of preserving selecteed PCRF1.
Step 914a, DRA return to the address of the PCRF1 of selection to P-GW.
Step 915a, P-GW and PCRF1 set up the IP-CAN session;
Particularly, P-GW initiates the request of IP-CAN session establishment to PCRF1, and PCRF1 returns to response to P-GW.
Step 916a, PCRF1 sets up the R session to BRAS/BNG, should be appreciated that this step can occur in after step 906a or step 910a after.
When access way is fly-by-night S2c access way:
Step 902b, UE initiate the IKEv2 authentication, authentication result ePDG, and after authentication success, UE obtains the IP address that the mobile network distributes.
Step 903b if AAA sets up session to PCRF, and finds PCRF by DRA, and AAA sends the session establishment request to DRA.
Should be appreciated that when AAA need to set up session to PCRF, and be configured to can be by static configuration PCRF address choice PCRF the time, execution in step 906b.
Step 904b, DRA check whether there has been the DRA binding, if exist, select PCRF according to described DRA binding, if do not exist, create a DRA binding;
Particularly, DRA described here binds: DRA is the binding relationship of certain conversation establishing of PCRF and this user or this user; Described DRA creates a DRA and binds: DRA selects PCRF1 according to local ip address, local ip address+UE ID, local ip address+UE ID+APN, and the address of preserving selecteed PCRF1.
Step 905b, the address that DRA replys by session establishment the PCRF1 that just selects returns to AAA.
Step 906b, AAA sets up session to PCRF1, notice UE access, PCRF1 returns to response to AAA.
Step 907b, ePDG initiate Gateway Control Session and set up message, also have local ip address information in message.
Step 908b, DRA check whether there has been the DRA binding, if exist, select PCRF according to described DRA binding, if do not exist, create a DRA binding;
Particularly, DRA described here binds: DRA is the binding relationship of certain conversation establishing of PCRF and this user or this user; Described DRA creates a DRA and binds: DRA selects PCRF1 according to local ip address, local ip address+UE ID, local ip address+UE ID+APN, and the address of preserving selecteed PCRF1.
Step 909b, DRA reply address from the PCRF1 of selection to ePDG that return to by session establishment.
Step 910b, ePDG initiates gateway control session to PCRF1, and PCRF1 returns to response to ePDG.
Step 911b, ePDG sends the IP address by IKEV2 message to UE, and this IP address is the IP address of mobile network's distribution.
Step 912b, UE initiates Binding Update to P-GW.
Step 913b, P-GW initiate the request of IP-CAN session establishment.
Whether step 914b, DRA check has had the DRA binding to exist, and because ePDG before completed alternately with DRA, has had the DRA binding this moment, and DRA selects PCRF1 in the DRA binding.
Step 915b, DRA return to the address of the PCRF1 of selection to P-GW.
Step 916b, P-GW initiates the request of IP-CAN session establishment to PCRF1, and PCRF1 returns to response to P-GW.
Step 917b, PCRF1 sets up the R session to BRAS/BNG, after this step can occur in step 906b, or after step 910b.
When access way is S2c access way trusty:
Step 902c, UE use IKEV2 to initiate the foundation of Security Association, complete authentication by P-GW to AAA.
Step 903c if AAA sets up session to PCRF, and finds PCRF by DRA, and AAA sends the session establishment request to DRA.
Should be appreciated that when AAA need to set up session to PCRF, and be configured to can be by static configuration PCRF address choice PCRF the time, execution in step 906c.
Step 904c, DRA check whether there has been the DRA binding, if exist, select PCRF according to described DRA binding, if do not exist, create a DRA binding;
Particularly, DRA described here binds: DRA is the binding relationship of certain conversation establishing of PCRF and this user or this user; Described DRA creates a DRA and binds: DRA selects PCRF1 according to local ip address, local ip address+UE ID, local ip address+UE ID+APN, and the address of preserving selecteed PCRF1.
Step 905c, the address that DRA replys by session establishment the PCRF1 that will select returns to AAA.
Step 906c, AAA sets up session to PCRF1, notice UE access, PCRF1 returns to response to AAA.
Step 907c, UE initiates Binding Update to P-GW, carries the local ip address of UE in message.
Step 908c, P-GW initiate the request of IP-CAN session establishment, carry the local ip address of UE in message.
Step 909c, DRA check whether there has been the DRA binding, if exist, select PCRF according to described DRA binding, if do not exist, create a DRA binding;
Particularly, DRA described here binds: DRA is the binding relationship of certain conversation establishing of PCRF and this user or this user; Described DRA creates a DRA and binds: DRA selects PCRF1 according to local ip address, local ip address+UE ID, local ip address+UE ID+APN, and the address of preserving selecteed PCRF1.
Step 910c, DRA return to the address of the PCRF1 of selection to P-GW.
Step 911c, P-GW initiates the request of IP-CAN session establishment to PCRF1, and PCRF1 returns to response to P-GW.
Step 912c, PCRF1 sets up the R session to BRAS/BNG, after this step can occur in step 906c.
That trunking scheme is applicable too for DRA.
Should be appreciated that the present embodiment is applicable equally when the DRA working method is trunking scheme.
Figure 10 is the structure of the selective system of PCRF of the present invention, and as shown in figure 10, described system comprises mobile network's network element 101 and DRA 102; Wherein, described DRA 102 after being used for receiving the request message of mobile network's network element 101 transmissions, searches whether there is the DRA binding; When not having the DRA binding, select PCRF according to the local ip address in described request message, and create the DRA binding of described request message.
Further, described DRA 102 also is used for when having the DRA binding, selects PCRF according to described DRA binding; Wherein, described DRA binds the binding relationship of PCRF and user or user's session request;
Described mobile network's network element 101 is ePDG or PCEF.
Wherein, described DRA 102, concrete local ip address for carrying according to corresponding relation and the described request message of pre-configured IP address field and PCRF is determined the IP address field that described local ip address is affiliated, and PCRF corresponding to described IP address field is defined as selecteed PCRF.
Further, described system also comprises fixed network network element 103; Wherein,
Described fixed network network element 103 is BRAS, BNG or AAA;
Described DRA 102 after also being used for receiving the request message of fixed network network element transmission, when not having the DRA binding, selects PCRF according to the local ip address in described request message, and preserves the address of selected PCRF.
Wherein, described DRA 102, concrete being used for preserved the address of selected PCRF and the corresponding relation of described local ip address when described request message comprises local ip address; When described request message comprises local ip address and UE ID, preserve the address of selected PCRF and the corresponding relation of described local ip address and UE ID; When described request message comprises local ip address, UE ID and APN, preserve the corresponding relation of selected PCRF and described local ip address, UE ID and APN;
Wherein, described local ip address is that fixed network is the public network address of user assignment or RG when being route pattern and network enabled address resolution NAT, and fixed network is the public network address that RG distributes.
The above is only preferred embodiment of the present invention, is not for limiting protection scope of the present invention.
Claims (10)
1. the system of selection of a policy control entity PCRF, is characterized in that, described method comprises:
After the DRA of Diameter route agent receives the request message of mobile network's network element transmission, search whether there is the DRA binding;
When not having the DRA binding, select PCRF according to the local ip address in described request message, and create the DRA binding of described request message.
2. method according to claim 1, is characterized in that, described method also comprises:
When having the DRA binding, select PCRF according to described DRA binding; Wherein, described DRA binds the binding relationship of PCRF and user or user's session request;
The packet data gateway ePDG that described mobile network's network element is evolution or policy and charging enforcement function entity PCEF.
3. method according to claim 1, is characterized in that, selects PCRF to be according to the local ip address that carries in described request message:
According to the local ip address that carries in the corresponding relation of pre-configured IP address field and PCRF and described request message, determine the IP address field under described local ip address, PCRF corresponding to described IP address field is defined as selecteed PCRF.
4. method according to claim 1, is characterized in that, described method also comprises:
Receive the request message of fixed network network element transmission as DRA after, when not having the DRA binding, select PCRF according to the local ip address in described request message, and preserve the address of selected PCRF; Wherein, described fixed network network element is broadband remote access servers BRAS, broadband gateway BNG or Certificate Authority and accounting server AAA.
5. the described method of according to claim 1 to 4 any one, is characterized in that, the DRA of described establishment described request message binds:
When described request message comprises local ip address, preserve the address of selected PCRF and the corresponding relation of described local ip address;
When described request message comprises local ip address and user terminal UE ID, preserve the address of selected PCRF and the corresponding relation of described local ip address and UE ID;
When described request message comprises local ip address, UE ID and APN APN, preserve the corresponding relation of selected PCRF and described local ip address, UE ID and APN; Wherein, described local ip address is that fixed network is the public network address of user assignment or home gateway RG when being route pattern and network enabled address resolution NAT, and fixed network is the public network address that RG distributes.
6. the selective system of a policy control entity PCRF, comprise mobile network's network element, it is characterized in that, described system also comprises: DRA, after being used for receiving the request message of mobile network's network element transmission, search whether there is the DRA binding; When not having the DRA binding, select PCRF according to the local ip address in described request message, and create the DRA binding of described request message.
7. system according to claim 6, is characterized in that, described DRA also is used for when having the DRA binding, selects PCRF according to described DRA binding; Wherein, described DRA binds the binding relationship of PCRF and user or user's session request;
Described mobile network's network element is ePDG or PCEF.
8. system according to claim 6, it is characterized in that, described DRA, concrete local ip address for carrying according to corresponding relation and the described request message of pre-configured IP address field and PCRF, determine the IP address field that described local ip address is affiliated, PCRF corresponding to described IP address field is defined as selecteed PCRF.
9. system according to claim 6, is characterized in that, described system also comprises the fixed network network element; Wherein,
Described fixed network network element is BRAS, BNG or AAA;
Described DRA after also being used for receiving the request message of fixed network network element transmission, when not having the DRA binding, selects PCRF according to the local ip address in described request message, and preserves the address of selected PCRF.
10. according to claim 6 to 9 any one described system, is characterized in that, described DRA, preserves the address that is selected PCRF and the corresponding relation of described local ip address at concrete being used for when described request message comprises local ip address; When described request message comprises local ip address and UE ID, preserve the address of selected PCRF and the corresponding relation of described local ip address and UE ID; When described request message comprises local ip address, UE ID and APN, preserve the corresponding relation of selected PCRF and described local ip address, UEID and APN;
Wherein, described local ip address is that fixed network is the public network address of user assignment or home gateway RG when being route pattern and network enabled address resolution NAT, and fixed network is the public network address that RG distributes.
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