CN101448242B - Finding method of proxy call session control function module and policy charging control system - Google Patents
Finding method of proxy call session control function module and policy charging control system Download PDFInfo
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- CN101448242B CN101448242B CN2008100847525A CN200810084752A CN101448242B CN 101448242 B CN101448242 B CN 101448242B CN 2008100847525 A CN2008100847525 A CN 2008100847525A CN 200810084752 A CN200810084752 A CN 200810084752A CN 101448242 B CN101448242 B CN 101448242B
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Abstract
The invention discloses a finding method of a proxy call session control function module and a policy charging control (PCC) system. When user equipment (UE) requests for establishing an IP bearer, proxy call session control function module (P-CSCF) information is provided by a subscription configuration memory SPR of a PCC to cause the UE to find the P-CSCF. By the method, the P-CSCF of a home domain can be found when the UE is in roaming state by upgrading associated servers of a GW and the PCC without modifying a great number of terminals. The method is simple and convenient, and smoothly transited with the prior art. By the method, the P-CSCF of a visited domain can be found when the P-CSCF can not be provided by the home domain for the UE.
Description
Technical field
The present invention relates to communication field, relate in particular to P-CSCF (Proxy Call Session Control Function) module is found at a kind of terminal through policy charging control system method and policy charging control system.
Background technology
IMS (IP Multimedia Subsystem, IP Multimedia System) is the standard of the next generation network of third generation affiliate tissue (3rd Generation Partnership Proiect is called for short 3GPP) definition; Its distinguishing feature is to have adopted Session initiation Protocol (Session Initiation Protocol is called for short SIP) system, and communication is irrelevant with access; Can possess multiple media business controlled function separates with bearing capacity; Calling separates with session, uses and separates business and network detach with service; And multiple abilities such as mobile network and internet integrated services, the trend of communication network fusion development has been complied with in the proposition of IMS.
Major function entity in the IMS system comprises: call conversation control function entity (the Call Session Control Function that functions such as user's registration management, session control are provided; Be called for short CSCF); Home subscriber server (the Home Subscriber Server of centralized management user contracting data function is provided; The application server (Application Server is called for short AS) of miscellaneous service logic control function is provided abbreviation HSS).
Fig. 1 has described network element entity and the contact thereof relevant with the present invention in the IMS architecture.Wherein: user terminal (User Equipment; Abbreviation UE) terminal equipment of 101 representative of consumer use; Call conversation control function entity (Call Session Control Function; Be called for short CSCF) be the core network element of control conversation procedure, comprising: proxy call session control function module (Proxy-CSCF is called for short P-CSCF) 102, module with query calling session controlling function (Interrogating-CSCF; Be called for short I-CSCF) 103, service call conversation control function module (Serving-CSCF is called for short S-CSCF) 104; Home subscriber server (Home Subscriber Server is called for short HSS) the 105th, the main storage server of all data relevant among the IMS with user and server; Application server (Application Server is called for short AS) 106 provides the network element of increment multimedia service.
Between each network element illustrated in fig. 1, UE links to each other with P-CSCF through Gm; Realize interconnected through Mw between P-CSCF, I-CSCF, S-CSCF; HSS links to each other with I-CSCF, S-CSCF through the Cx interface realization, realizes linking to each other with AS through Sh interface; S-CSCF realizes linking to each other with AS through ISC (IMS servicecontrol, the professional control of IMS is called for short ISC) interface.
In the 3GPP standard, signaling and operation flow are controlled by the network element entity that with CSCF is core.And the policy control of media bearer and charging etc. are then carried out by policy charging control system (PolicyCharging Control is called for short PCC).
Fig. 2 has described each main network element entity and contact under the PCC framework under the 3GPP standard R7 version.Wherein: subscribe to configuration store (Subscription Profile Repository is called for short SPR) 201 and be used to store user's strategy and charging configuration information; Applied layer interface functional module (ApplicationFunction is called for short AF) the 202nd, the general designation of the network element entity that the business of realization is controlled; "Policy and Charging Rules Function module (Policy and Charging Rules Function, be called for short PCRF) the 203rd, the essential functional entities of PCC framework is used for obtaining, assemble, issue etc. of control strategy and charging regulation; Strategy and charge execution function module (Policy and Charging Enforcement Function is called for short PCEF) the 204th, concrete strategy and the execution of charging point are usually located in the gateway (Gate Way is called for short GW); Online Charging System (Online Charging System) 205 provides online billing function; Off-line accounting system (Offline Charging System is called for short OFCS) 206 provides the offline charging function.
In PCC framework illustrated in fig. 2, SPR has stored user's the strategy and the configuration information of charging, and PCRF utilizes the Sp interface from SPR, to obtain user's the strategy and the relevant configuration information that charges, and is assembled into the PCC rule, utilizes the Gx interface to be issued to PCEF; PCEF uses the Gx interface to ask the PCC rule to PCRF, and utilizes the PCC rule, the Media Stream through GW is verified what control and restricting media flowed passes through; If there is Online Charging System, then PCEF passes through the Gy interface to charge informations such as Online Charging System request media authorization, report medium flows; If there is off-line accounting system, then PCEF reports charge information through the Gz interface to off-line accounting system.
The IMS core network is that UE provides service; Needing to specify some P-CSCF is that UE provides service; Therefore before UE initiated register requirement, the IMS network need distribute P-CSCF for UE, and UE also need find this P-CSCF; IMS provides the mode of two kinds of UE discovery P-CSCF at present: wherein Fig. 4 finds the IP address of P-CSCF for UE adopts PDP (Packet Data Protocol, packet data protocol) context activation mode; Fig. 5 finds the IP address of P-CSCF for UE adopts DHCP (Dynamic HostConfiguration Protocol, dynamic host allocation protocol)/DNS (Domain Name System, domain name system) mode.
Before two kinds of UE of explanation found the P-CSCF mode, the network topology of related network element of P-CSCF and equipment is found in explanation earlier, and was as shown in Figure 3.Main network element and equipment are among the figure: 301-user terminal (User Equipment; Be called for short UE); 302-gateway (Serving Gateway is called for short SGW), 303-public data network gateway (Public DataNetworks Gateway; Be called for short PGW), 304-DHCP/DNS server (being called for short DHCP/DNS).In Fig. 4 and Fig. 5, in order to simplify the description of flow process, also SGW and PGW are referred to as GW (Gateway), DHCP/DNS can be two servers: Dynamic Host Configuration Protocol server and dns server.
Fig. 4 finds the schematic flow sheet of the IP address of P-CSCF for adopting the PDP context activation mode; This flow process is applicable to needs to adopt dial mode to set up the situation of carrying; Answer this in the prior art; Also need two network elements: gateway (Serving Gateway is called for short SGW) cooperates completion with public data network gateway (Public Data Networks Gateway is called for short PGW).Its idiographic flow is following:
401) UE sends the PDP context activation request to SGW, because P-CSCF is found in the UE expectation, therefore in this request, has added the indication of obtaining P-CSCF;
402) SGW resolves the APN information of carrying in the PDP context activation request, the PGW of service is provided according to Information Selection after, request is transmitted to this PGW;
403) PGW has obtained the IP address for the P-CSCF of this UE service, and obtain manner can be for accomplishing through inquiring about inner configuration information;
404) PGW creates the PDP context activation response, has wherein carried except that other necessary information, has also carried the IP address of P-CSCF, and PGW sends to SGW with this response;
405) SGW sends to UE with the PDP context activation success response; In view of the above, successfully set up IP-CAN, UE has also obtained the IP address information of P-CSCF simultaneously; Accomplished the discovery to P-CSCF, later UE can accomplish registration and other SIP request through this P-CSCF.
Fig. 5 finds the IP address of P-CSCF for adopting the DHCP/DNS mode; This mode is applicable to the network that has DHCP and DNS service, and wherein, UE also need set up carrying through PDP Context and SGW, PGW; Here in order to simplify flow process; SGW, PGW closed be called gateway (GateWay, be called for short GW), its idiographic flow is following:
501) set up carrying through PDP context activation, in this process,, also can obtain through PDP Context request, response if the domain name of P-CSCF is found in the UE expectation;
502) UE finds the Dynamic Host Configuration Protocol server that present networks is inner;
503) UE initiates the DHCP request to this Dynamic Host Configuration Protocol server, and request distributing IP address is if the domain name of P-CSCF is found in the UE expectation, with in request, adding indication; Server will return the information such as IP address of distributing to this UE to UE through dhcp response, if comprised the indication of discovery P-CSCF domain name in the request, also with the domain name of in response, adding P-CSCF;
504) the IP address of the domain name discovery P-CSCF of DNS through obtaining P-CSCF, the domain name of P-CSCF can obtain through pdp context activation, also can obtain through dhcp process, also can be the information that is pre-configured on the UE.
More than be that two kinds of providing at present of the IMS of 3GPP are found the P-CSCF methods, the P-CSCF information that two kinds of method UE obtain all need be pre-configured in PGW or the Dynamic Host Configuration Protocol server.But when UE is in roaming state; SGW, PGW and DHCP/DNS server generally all are to be provided by the visit territory; UE expectation at this moment finds that the P-CSCF of home domain will be very difficult, and perhaps working as UE can't provide P-CSCF by home domain, when can only find to visit the P-CSCF in territory; Also will run into the scheme that sizable difficulty: Fig. 3 provides; Because the information of P-CSCF is to accomplish through the mode of searching internal configurations, the visit territory can not dispose the configuration information of all-network, the process that is difficult to the maintain internal configuration in the time of roaming; The scheme that Fig. 4 provides; Because PDP Context, DHCP all are the P-CSCF domain names in the visit territory returned; Even UE adopts the domain name of pre-configured P-CSCF, can't guarantee that also the DNS that visits the territory can correctly resolve this domain name, can see that thus versatility is not strong.
In sum, the technical scheme of a kind of new discovery P-CSCF of current needs especially is in roaming state as UE, and SGW, PGW and DHCP/DNS server generally all are when being provided by the visit territory, finds the technical scheme of the P-CSCF of home domain; Perhaps working as UE can't provide P-CSCF by home domain, finds the technical scheme of the P-CSCF in visit territory.
Summary of the invention
Technical problem to be solved by this invention provides a kind of discover method and policy charging control system of P-CSCF module, has solved when UE is in roaming or non-roaming state, can find the problem of P-CSCF.
In order to address the above problem, the invention provides a kind of discover method of proxy call session control function module,
When user terminal UE request was set up IP and carried, the subscription configuration store SPR through policy charging control system PCC provided proxy call session control function module P-CSCF information, makes UE find P-CSCF.
Further; Said method also can comprise; The information of pre-configured P-CSCF or SPR be after receiving the request of obtaining P-CSCF information among the said SPR, from network, obtains the information of P-CSCF, and SPR confirms the P-CSCF information of UE according to the access information of the situation of current P-CSCF and UE.
Further, said method can comprise that also this discover method further is divided into following steps:
The strategy of a, PCC and charge execution function module PCEF carry out the PCC authorization check like need after receiving the request of the IP carrying foundation that UE sends, and send request to "Policy and Charging Rules Function module PCRF, and ask to return P-CSCF information;
If there is not the relevant information of said UE on the b PCRF, then PCRF sends request, acquisition request P-CSCF information to SPR; After SPR receives the PCRF sent request, return the request response, comprise P-CSCF information in the request response to PCRF; The information of PCRF through obtaining from SPR produces strategic decision-making and charging regulation and sends to PCEF, wherein comprises P-CSCF information;
C, PCEF obtain P-CSCF information from the described request response, and the response that will comprise P-CSCF information sends to the UE of initiation request; The P-CSCF INFORMATION DISCOVERY P-CSCF of UE through obtaining.
Further, said method also can comprise, further comprise among the said step b,
The information that said PCRF will obtain from SPR is kept in the local storage of PCRF, and when PCEF sends when returning the request of P-CSCF information to PCRF, if there is the relevant information of said UE on the PCRF, then PCRF returns the relevant information of UE to PCEF.
Further, said method also can comprise, after said PCEF receives that the IP of UE transmission carries the request of setting up,, further comprise among the then said step c if employing PDP context activation mode is obtained P-CSCF,
PCEF sends to the UE of initiation request with the PDP context activation success response, wherein comprises P-CSCF information in the response, and the P-CSCF information of UE through obtaining is found P-CSCF.
Further; Said method also can comprise, after said PCEF receives the request of the IP carrying foundation that UE sends, if adopt dynamic host allocation protocol DHCP mode to find P-CSCF; Then through said step a to step c; Obtain P-CSCF information and be stored in gateway GW from SPR, UE obtains P-CSCF information through dhcp response from GW then, finds P-CSCF.
Further; Said method also can comprise; UE is under roaming state; PCEF transmission is earlier obtained the request of P-CSCF information to visit territory PCRF, transmits the request of obtaining P-CSCF information through visit territory PCRF again and arrives home domain PCRF, and home domain PCRF obtains the P-CSCF information of home domain from home domain SPR.
Further; Said method also can comprise, if the SPR of home domain PCRF through home domain obtains the P-CSCF information failure of home domain or be not allowed to obtain the P-CSCF information of home domain, then visits the P-CSCF information that territory PCRF will obtain the visit territory; And this P-CSCF information returned to the UE of roaming state; Wherein, the P-CSCF information that visit territory PCRF obtains the visit territory obtains through the local configuration of inquiry, and perhaps the SPR to the visit territory obtains the P-CSCF information in visit territory.
Further, said method can comprise that also UE is under non-roaming state, and PCEF sends the request of obtaining P-CSCF information earlier and arrives home domain PCRF, and home domain PCRF obtains the P-CSCF information of home domain from home domain SPR.
Further, said method can comprise that also the P-CSCF information that said UE obtains comprises the IP address information of P-CSCF or the domain-name information of P-CSCF;
If the P-CSCF information that UE obtains is the domain-name information of P-CSCF, then obtain the IP address information of P-CSCF through the domain name system DNS server.
The present invention also provides a kind of policy charging control system, and comprise strategy and charge execution function module PCEF, "Policy and Charging Rules Function module PCRF and subscribe to configuration store SPR,
Said PCEF; After being used to receive the request that has discovery proxy call session control function module P-CSCF; In policy charging control system PCC authorization check process, ask P-CSCF information to said PCRF, and return the P-CSCF information of acquisition through response message;
Said PCRF is used for after the request of receiving P-CSCF information, to said SPR acquisition request P-CSCF information, and the P-CSCF information of obtaining is turned back to said PCEF;
Said SPR is used for after receiving the request of obtaining P-CSCF information, and the P-CSCF information that acquisition needs from pre-configured P-CSCF information or from network is confirmed the P-CSCF information of UE according to the access information of UE, and returned said PCRF.
Further, above-mentioned policy charging control system also can comprise, said PCEF; After also being used to receive the request of the IP carrying foundation of finding P-CSCF having of UE transmission; Carry out the PCC authorization check like need, send request to PCRF, user's P-CSCF information is returned in request; And from the described request response, obtaining P-CSCF information, the response that will comprise P-CSCF information sends to the UE of initiation request;
Said PCRF also is used to receive the request that PCEF sends, if there is not booking reader's relevant information on the PCRF, then sends request, acquisition request P-CSCF information to SPR; Receive the request response that comprises P-CSCF information that SPR sends,, produce strategic decision-making and charging regulation and send to PCEF, wherein comprise P-CSCF information through the information of obtaining from SPR.
Further; Above-mentioned policy charging control system also can comprise, said PCRF also is used for the information of obtaining from SPR; Be kept in the local storage of PCRF; When PCEF sends when returning the request of P-CSCF information to PCRF,, then return the relevant information of UE to PCEF if there is the relevant information of said UE on the PCRF.
Further, above-mentioned policy charging control system can comprise that also the P-CSCF information that said SPR provides comprises the IP address information of P-CSCF or the domain-name information of P-CSCF.
Compared with prior art; Use the present invention, only need upgrade, just can solve UE finds the P-CSCF of home domain when roaming state problem the associated server of GW, PCC; And need not make any modification to the terminal of enormous amount; Method is easy and seamlessly transit with prior art, when the present invention simultaneously also can solve UE and can't P-CSCF be provided by home domain, finds the problem of the P-CSCF in visit territory.
Description of drawings
Fig. 1 is the network element entity relevant with the present invention in the IMS architecture and the sketch map of contact thereof in the prior art;
Fig. 2 is the sketch map of each main network element entity and contact under the PCC framework in the prior art;
Fig. 3 is a network topological diagram of finding related network element of P-CSCF and equipment in the prior art;
Fig. 4 is the schematic flow sheet that available technology adopting PDP context activation mode is found P-CSCF;
Fig. 5 is the schematic flow sheet that available technology adopting DHCP/DNS mode is found P-CSCF;
Fig. 6 is the network topology sketch map under the roaming state behind the introducing PCC;
Fig. 7 is that PCC carries the schematic flow sheet that session is set up in the prior art;
Fig. 8 passes through the flow chart that PCC finds the method for P-CSCF among the present invention;
Fig. 9 is the schematic flow sheet that when roaming found home domain P-CSCF among the present invention;
Figure 10 is the schematic flow sheet that when roaming found visit territory P-CSCF among the present invention;
Figure 11 is a schematic flow sheet of finding P-CSCF among the present invention when non-roaming.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described further.
Fig. 6 is the network topology sketch map under the roaming state behind the introducing PCC, relates generally to following network element and equipment: 601-user terminal (User Equipment is called for short UE); 602-gateway (Gateway; Be called for short GW), here gateway is a general designation, purpose is in order to simplify the description of back flow process; Comprise gateway (Serving Gateway in the gateway; Abbreviation SGW), public data network gateway (PublicData Networks Gateway is called for short PGW), strategy and charge execution function module function network elements such as (Policy andCharging Enforcement Function are called for short PCEF); The 603-charge system is generally comprised within line charge system (Online Charging System is called for short OCS) and off-line accounting system (Offline Charging System is called for short OFCS); 604-visit domain policy and charging rule functions module (Visited Policy and Charging Rules Function is called for short V-PCRF); 605-home domain "Policy and Charging Rules Function module (Home Policy and Charging Rules Function is called for short H-PCRF); 606-Applied layer interface functional module (Application Function is called for short AF), AF and P-CSCF are same network element below; 607-subscribes to configuration store (SubscriptionProfile Repository is called for short SPR), 608-DNS server/Dynamic Host Configuration Protocol server.When UE is in roaming state; GW is positioned at the visit territory, and GW is through V-PCRF and H-PCRF interaction data, and if UE when being in non-roaming state; Then GW is positioned at home domain; Direct and the H-PCRF interaction data of GW, having only H-PCRF this moment is the UE service, claims that H-PCRF is that PCRF can not lead to misunderstanding yet when answering this non-roaming.
Set up in the process of carrying at UE and GW, when UE sends PDP context activation request arrival PGW, also triggered the foundation of PCC session, when particularly UE roamed, the home domain that the PCC session need be arrived UE carried out the corresponding strategies request.Flow process (with Fig. 4 and Fig. 5) sketch map was set up in PCC carrying session when Fig. 7 was roaming, and idiographic flow is following:
701) PCEF receives the IP that UE sends and carries the request of setting up among the GW in visit territory, and distributes one to visit domain IP address for the user;
702) the PCEF affirmation needs to carry out the PCC authorization check, is that V-PCRF sends request to the PCRF in visit territory, and request V-PCRF returns the user and can allow information such as service, PCC rule;
PCEF must comprise the IP address of sign, the UE of following key message: UE, the network identity (PUMN Identifier) that UE inserted, PDN Gateway sign (PDN Identifier), IP bearer types, the IP that UE inserted and carry and set up pattern, default charging way etc. in the request that sends to V-PCRF.
Wherein, the IP address of the sign of UE, UE can be used to identify the IP that belongs to a UE and carry.
703) V-PCRF detects the request that PCEF sends, and detecting this request is the request that needs home domain to handle, and simultaneously, V-PCRF may do some decision-makings according to this locality configuration;
704) V-PCRF is that H-PCRF sends request to the PCRF of home domain, and request is returned the user and can be allowed information such as service, PCC rule;
705) if there is not booking reader's relevant information on the H-PCRF, then H-PCRF sends request to SPR, in the hope of strategy and the charging relevant configuration information of obtaining the booking reader;
Send in the request of SPR at H-PCRF, can comprise following message usually: the PDN identification information of carrying etc. is set up in booking reader's id information, request.H-PCRF possibly require the information change situation of SPR notice H-PCRF about the booking reader in this request.
706) H-PCRF has obtained the information that needs from SPR, is kept in the local storage of H-PCRF.At least comprise in these information: admissible service, PCC rule;
707) H-PCRF utilizes the information of obtaining from SPR, produces the strategic decision-making and the charging regulation of home domain;
708) H-PCRF returns the strategic decision-making and the charging regulation information of being asked to V-PCRF;
709) after V-PCRF receives the strategic decision-making and charging regulation information of H-PCRF transmission, visit the local policy decision-making in territory;
710) V-PCRF sends to PCEF with strategic decision-making and charging regulation information, therein, comprises usually: selected IP carries pattern, default charge mode, the admissible service of setting up; PCEF carries out this strategic decision-making after receiving information such as strategic decision-making and charging regulation;
711) PCEF provides the relevant initialization input information that charges to the online charging function OCS of home domain, with the charging credit of request to charging regulation.Because if desired this is carried out online charging to the user, then have at least a PCC rule to be activated, so that PCEF can activate the online charging process.
712) if online charging can be used, then the OCS of home domain is that PCEF prepares corresponding charging credit information, and the OCS of home domain is transferred to PCEF with the charging credit information, may trigger re-authorization to each credit of chargeing simultaneously;
713) finally, at least one PCC rule is successfully activated, if the online charging function is activated, and OCS provides available charging credit, then PCEF notice UE media bearer successfully foundation among the GW.
Because the present invention is directly not related with the content of charging aspect, so steps such as the credit request in the PCC flow process of back, credit request response will be omitted.
The SPR that main design of the present invention is PCC can provide P-CSCF information; When the IP carrying is set up in the UE request, can obtain P-CSCF information through the SPR of PCC.
As shown in Figure 8, a kind of method through PCC discovery P-CSCF specifically may further comprise the steps,
If there is not the said UE relevant information of (as far as PCC, being called the booking reader) on step 20 PCRF, then PCRF sends request to SPR, in the hope of allowed service, PCC rule and the P-CSCF information of obtaining UE;
If the last relevant information that has said UE of PCRF, then PCRF returns the relevant information of UE to PCEF.
Wherein, If the SPR of the information of the P-CSCF of pre-configured home domain or home domain is after receiving the request of obtaining P-CSCF information among the SPR of home domain; From network, obtain the information of the P-CSCF of home domain; Then PCRF sends request to the SPR of home domain, in the hope of allowed service, PCC rule and the P-CSCF information of obtaining UE; UE adopts PCC to find that home domain P-CSCF transmits the request of obtaining P-CSCF information through visit territory PCRF to arrive home domain PCRF under roaming state, and home domain PCRF obtains the P-CSCF information of home domain from home domain SPR.
After step 30, SPR receive the PCRF sent request, return the request response, comprised P-CSCF information in the request response to PCRF;
Information that can pre-configured P-CSCF among the SPR, perhaps SPR can obtain the information of P-CSCF in the network, and SPR can confirm the P-CSCF information of UE according to the access information of the situation of current P-CSCF and UE.
P-CSCF information comprises IP address or the domain-name information of P-CSCF.
If the P-CSCF information failure back (the P-CSCF information of perhaps obtaining home domain is not allowed to) that H-PCRF obtains home domain through the SPR of home domain, the V-PCRF on the link will obtain the P-CSCF information in visit territory, and this P-CSCF information is returned to UE; UE adopts visit territory PCRF to obtain the P-CSCF in visit territory from visit territory SPR under roaming state; The P-CSCF that V-PCRF obtains the visit territory can obtain through the local configuration of inquiry, also can obtain the P-CSCF information in visit territory to the SPR in visit territory.
PGW or PCRF will preserve the P-CSCF information of obtaining from SPR (visit territory or home domain SPR), take when finding P-CSCF in order to next time.
PCEF has comprised IP address or the domain-name information of P-CSCF in returning IP carrying response.
After step 70, UE obtain P-CSCF information, finally obtain the IP address of proxy call session control function module.
The P-CSCF information of obtaining can be the IP address of P-CSCF, also can be the domain name of P-CSCF; Be the domain name of P-CSCF if UE obtains, also need finally obtain the IP address of P-CSCF through dns server.
Fig. 9 finds the schematic flow sheet of home domain P-CSCF when being the UE roaming, as follows,
801) PCEF receives the request that the IP of UE carry to set up among the GW in visit territory, if adopt the PDP context activation mode to obtain P-CSCF, then this request comprises the indication of finding P-CSCF, distributes one to visit domain IP address as UE;
802) the PCEF affirmation needs to carry out the PCC authorization check, sends request to the PCRF (V-PCRF) in visit territory, and request V-PCRF returns the user and can allow service, PCC rule, P-CSCF information etc.;
803) V-PCRF detects the request that PCEF sends, and detecting this request is the request that needs home domain to handle, and simultaneously, V-PCRF may do some decision-makings according to this locality configuration;
804) V-PCRF sends request to the PCRF of home domain (H-PCRF), and request is returned the user and can be allowed information such as service, PCC rule, P-CSCF;
805) if there is not booking reader's relevant information on the H-PCRF, then H-PCRF sends request to SPR, in the hope of the information such as allowed service, PCC rule and P-CSCF of obtaining UE ...;
If the last relevant information that has said UE of H-PCRF, then H-PCRF returns the relevant information of UE to PCEF.
Send in the request of SPR at H-PCRF, set up the information such as PDN identification information of carrying, also comprise the request of returning P-CSCF information except the id information, the request that comprise said UE.
806) H-PCRF has obtained the information (the P-CSCF information that comprises pre-configured home domain on SPR the information) that needs from SPR, is kept in the local storage of H-PCRF;
At least comprise in these information: the P-CSCF information of admissible service, PCC rule and home domain.
807) information of H-PCRF through obtaining from SPR, the strategic decision-making and the charging regulation of generation home domain;
808) H-PCRF return to V-PCRF the UE that asked allow serve, the P-CSCF information of PCC rule and home domain;
809) V-PCRF receive UE that H-PCRF sends allow serve, after the P-CSCF information of PCC rule and home domain, the local policy decision-making of visiting the territory;
810) if V-PCRF is for there being state PCRF, then V-PCRF preserve in this locality said UE allow serve, the P-CSCF information of PCC rule and home domain; V-PCRF with UE allow serve, the P-CSCF information of PCC rule and home domain sends to PCEF; After PCEF receives information, implementation strategy decision-making, and the P-CSCF information of preserving the home domain of UE;
811) PCEF returns IP carrying response for said UE; Carry the P-CSCF information of home domain; If adopt the PDP context activation mode to obtain P-CSCF information, P-CSCF information will be carried at IP and carry in the response, and this moment, UE obtained to comprise the relevant information of P-CSCF information; The P-CSCF information that UE obtains can be the IP address of P-CSCF, also can be the domain name of P-CSCF; If what UE obtained is the domain-name information of P-CSCF, then need further obtain the IP address of P-CSCF through servers such as DNS, finally accomplish the discovery procedure of P-CSCF.
Find P-CSCF if adopt the DHCP mode; Then be to obtain P-CSCF information and be stored in GW from SPR through the PDP context activation mode; Then UE through dhcp response from GW obtain P-CSCF information (flow process of obtaining through DNS/DHCP with existing the employing mode identical); The final discovery procedure of accomplishing P-CSCF, DHCP, DNS ask identical among its flow process and Fig. 5.
Fig. 9 based on configuration in home domain allow UE to find to be positioned at the P-CSCF of home domain, also exist and can't find to be positioned at the P-CSCF of home domain or the P-CSCF of home domain does not allow to be roamed the situation that UE finds; Figure 10 is the schematic flow sheet of finding visit territory P-CSCF when UE roams among the present invention, and is as follows:
901) PCEF receives the request that the IP of UE carry to set up among the GW in visit territory, in this request, has comprised the indication of finding P-CSCF, and visits domain IP address for one of UE distribution;
902) the PCEF affirmation needs to carry out the PCC authorization check, sends request to the PCRF (V-PCRF) in visit territory, and request V-PCRF returns the user and can allow information on services, PCC Rule Information, P-CSCF information etc.
903) V-PCRF detects the request that PCEF sends, and detecting this request is the request that needs home domain to handle, and simultaneously, V-PCRF may do some decision-makings according to this locality configuration;
904) V-PCRF sends request to the PCRF of home domain (H-PCRF), and request is returned the user and can be allowed information such as service, PCC rule;
905) if there is not booking reader's relevant information on the H-PCRF, then H-PCRF sends request to home domain SPR, in the hope of strategy and the charging relevant configuration information of obtaining the booking reader;
If the last relevant information that has said UE of H-PCRF, then H-PCRF returns the relevant information of UE to PCEF.
Send in the request of SPR at H-PCRF, set up the information such as PDN identification information of carrying, also comprise the request of returning home domain P-CSCF information except the id information, the request that comprise the booking reader;
906) H-PCRF has obtained the information that needs from home domain SPR, is kept in the local storage of H-PCRF;
At least comprise in these information: admissible service, PCC rule, but do not comprise the P-CSCF information of home domain.
907) information of H-PCRF through obtaining from SPR, the strategic decision-making and the charging regulation of generation home domain;
908) H-PCRF returns the strategic decision-making and the charging regulation information of being asked to V-PCRF;
909) after V-PCRF receives the strategic decision-making and charging regulation information of H-PCRF transmission, visit the local policy decision-making in territory;
The P-CSCF information of the home domain of request is not arranged in the information that 910) V-PCRF finds to return, and territory SPR sends request to visit, in the hope of obtaining the P-CSCF information in visit territory;
911) visit territory SPR returns the P-CSCF information in visit territory to V-PCRF;
Wherein, information or the information that SPR can obtain P-CSCF in the network of pre-configured P-CSCF among the SPR in visit territory, SPR can confirm the P-CSCF information of UE according to the access information of the situation of current P-CSCF and UE.
912) if V-PCRF is for there being state PCRF, then also can be in the information of local conversation strategy decision-making and charging regulation and P-CSCF, V-PCRF sends to PCEF with the information of strategic decision-making and charging regulation and P-CSCF; This PCEF carries out this strategic decision-making after receiving information such as strategic decision-making and charging regulation;
913) PCEF gives the P-CSCF information that said UE sends the visit territory, and this moment, UE also obtained to comprise the relevant information of P-CSCF information; The P-CSCF information that UE obtains can be the IP address of P-CSCF, also can be the domain name of P-CSCF; If what UE obtained is the domain-name information of P-CSCF, then need further obtain the IP address of P-CSCF through servers such as DNS, finally accomplish the discovery procedure of P-CSCF.
V-PCRF finds visit territory P-CSCF information among Figure 10, except through among the figure from visit territory SPR request mode, also can accomplish through the local configuration information of inquiry.Certainly and Fig. 9 similar, also can adopt the DHCP mode to find to visit territory P-CSCF, identical among the difference of its flow process and PDP context activation mode and Fig. 9 repeated no more here.
Figure 11 is the schematic flow sheet that UE finds P-CSCF among the present invention when non-roaming, can certainly adopt DHCP mode UE when non-roaming, to find P-CSCF, and its difference is identical with two examples of front, is not giving unnecessary details, and step is as follows among Figure 11:
1001) PCEF in the network receives the request that the IP of UE carry to set up, and in this request, comprises the indication of finding P-CSCF, and distributes one to visit domain IP address for the user;
1002) the PCEF affirmation needs to carry out the PCC authorization check, sends request to PCRF, and request PCRF returns the user can allow service, PCC rule and P-CSCF information etc.
1003) PCRF detects the request that PCEF sends, and detecting this request promoter UE is non-roaming user, and simultaneously, PCRF may do some decision-makings according to this locality configuration;
1004) if there is not booking reader's relevant information on the PCRF, then PCRF sends request to SPR, can allow service, PCC rule and P-CSCF information etc. in the hope of obtaining the user;
If the last relevant information that has said UE of PCRF, then PCRF returns the relevant information of UE to PCEF.
Send in the request of SPR at PCRF, set up the information such as PDN identification information of carrying, also comprise the request of returning P-CSCF except the id information, the request that comprise the user.
1005) PCRF has obtained the information (comprising P-CSCF information the information) that needs from SPR, is kept in the local storage of PCRF;
The information of pre-configured P-CSCF or SPR can obtain the information of P-CSCF in the network among the said SPR, and SPR can confirm the P-CSCF information of UE according to the access information of the situation of current P-CSCF and UE.
At least comprise in these information: admissible service, PCC rule and P-CSCF information.
1006) information of PCRF through obtaining from SPR produces strategic decision-making and charging regulation information;
1007) PCRF is in local conversation strategy decision-making and charging regulation and P-CSCF information, and PCRF sends to PCEF with strategic decision-making and charging regulation and P-CSCF information; PCEF carries out this strategic decision-making after receiving information such as strategic decision-making and charging regulation;
1008) PCEF sends P-CSCF information for said UE, and this moment, UE also obtained to comprise the relevant information of P-CSCF information; The P-CSCF information that UE obtains can be the IP address of P-CSCF, also can be the domain name of P-CSCF; If what UE obtained is the domain-name information of P-CSCF, then need further obtain the IP address of P-CSCF through servers such as DNS, finally accomplish the discovery procedure of P-CSCF.
This shows; Use the present invention, only need upgrade, just can solve UE finds the P-CSCF of home domain when roaming state problem the associated server of GW, PCC; And need not make any modification to the terminal of enormous amount, method is easy and seamlessly transit with prior art.
The above; Be merely the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with this technological people in the technical scope that the present invention disclosed; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (13)
1. the discover method of a proxy call session control function module is characterized in that,
When user terminal UE request was set up IP and carried, the subscription configuration store SPR through policy charging control system PCC provided proxy call session control function module P-CSCF information, makes UE find P-CSCF;
Further be divided into following steps:
The strategy of a, PCC and charge execution function module PCEF carry out the PCC authorization check like need after receiving the request of the IP carrying foundation that UE sends, and send request to "Policy and Charging Rules Function module PCRF, and ask to return P-CSCF information;
If there is not the relevant information of said UE on the b PCRF, then PCRF sends request, acquisition request P-CSCF information to SPR; After SPR receives the PCRF sent request, return the request response, comprise P-CSCF information in the request response to PCRF; The information of PCRF through obtaining from SPR produces strategic decision-making and charging regulation and sends to PCEF, wherein comprises P-CSCF information;
C, PCEF obtain P-CSCF information from the described request response, and the response that will comprise P-CSCF information sends to the UE of initiation request; The P-CSCF INFORMATION DISCOVERY P-CSCF of UE through obtaining.
2. discover method as claimed in claim 1 is characterized in that,
The information of pre-configured P-CSCF or SPR be after receiving the request of obtaining P-CSCF information among the said SPR, from network, obtains the information of P-CSCF, and SPR confirms the P-CSCF information of UE according to the access information of the situation of current P-CSCF and UE.
3. discover method as claimed in claim 1 is characterized in that,
Further comprise among the said step b,
The information that said PCRF will obtain from SPR is kept in the local storage of PCRF, and when PCEF sends when returning the request of P-CSCF information to PCRF, if there is the relevant information of said UE on the PCRF, then PCRF returns the relevant information of UE to PCEF.
4. discover method as claimed in claim 1 is characterized in that,
After said PCEF receives that the IP of UE transmission carries the request of setting up,, further comprise among the then said step c if employing PDP context activation mode is obtained P-CSCF,
PCEF sends to the UE of initiation request with the PDP context activation success response, wherein comprises P-CSCF information in the response, and the P-CSCF information of UE through obtaining is found P-CSCF.
5. discover method as claimed in claim 1 is characterized in that,
After said PCEF receives the request of the IP carrying foundation that UE sends; Find P-CSCF if adopt dynamic host allocation protocol DHCP mode; Then through said step a to step c; Obtain P-CSCF information and be stored in gateway GW from SPR, UE obtains P-CSCF information through dhcp response from GW then, finds P-CSCF.
6. discover method as claimed in claim 1 is characterized in that,
UE is under roaming state, and PCEF transmission is earlier obtained the request of P-CSCF information to visit territory PCRF, transmits the request of obtaining P-CSCF information through visit territory PCRF again and arrives home domain PCRF, and home domain PCRF obtains the P-CSCF information of home domain from home domain SPR.
7. discover method as claimed in claim 6 is characterized in that,
If the SPR of home domain PCRF through home domain obtains the P-CSCF information failure of home domain or is not allowed to obtain the P-CSCF information of home domain; Then visit territory PCRF and will obtain the P-CSCF information in visit territory; And this P-CSCF information returned to the UE of roaming state; Wherein, the P-CSCF information that visit territory PCRF obtains the visit territory obtains through the local configuration of inquiry, and perhaps the SPR to the visit territory obtains the P-CSCF information in visit territory.
8. discover method as claimed in claim 1 is characterized in that,
UE is under non-roaming state, and PCEF sends the request of obtaining P-CSCF information earlier and arrives home domain PCRF, and home domain PCRF obtains the P-CSCF information of home domain from home domain SPR.
9. like the described arbitrary discover method of claim 1-8, it is characterized in that,
The P-CSCF information that said UE obtains comprises the IP address information of P-CSCF or the domain-name information of P-CSCF;
If the P-CSCF information that UE obtains is the domain-name information of P-CSCF, then obtain the IP address information of P-CSCF through the domain name system DNS server.
10. a policy charging control system comprises strategy and charge execution function module PCEF, "Policy and Charging Rules Function module PCRF and subscribes to configuration store SPR, it is characterized in that,
Said PCEF; After being used to receive the request that has discovery proxy call session control function module P-CSCF; In policy charging control system PCC authorization check process, ask P-CSCF information to said PCRF, and return the P-CSCF information of acquisition through response message;
Said PCRF is used for after the request of receiving P-CSCF information, to said SPR acquisition request P-CSCF information, and the P-CSCF information of obtaining is turned back to said PCEF;
Said SPR is used for after receiving the request of obtaining P-CSCF information, and the P-CSCF information that acquisition needs from pre-configured P-CSCF information or from network is confirmed the P-CSCF information of UE according to the access information of UE, and returned said PCRF.
11. policy charging control system as claimed in claim 10 is characterized in that,
Said PCEF; After also being used to receive the request of the IP carrying foundation of finding P-CSCF having of UE transmission; Carry out the PCC authorization check like need, send request to PCRF, user's P-CSCF information is returned in request; And from the described request response, obtaining P-CSCF information, the response that will comprise P-CSCF information sends to the UE of initiation request;
Said PCRF also is used to receive the request that PCEF sends, if there is not booking reader's relevant information on the PCRF, then sends request, acquisition request P-CSCF information to SPR; Receive the request response that comprises P-CSCF information that SPR sends,, produce strategic decision-making and charging regulation and send to PCEF, wherein comprise P-CSCF information through the information of obtaining from SPR.
12. policy charging control system as claimed in claim 11 is characterized in that,
Said PCRF also is used for the information of obtaining from SPR, is kept in the local storage of PCRF, when PCEF sends when returning the request of P-CSCF information to PCRF, if there is the relevant information of said UE on the PCRF, then returns the relevant information of UE to PCEF.
13. like the described arbitrary policy charging control system of claim 10-12, it is characterized in that,
The P-CSCF information that said SPR provides comprises the IP address information of P-CSCF or the domain-name information of P-CSCF.
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| CN1968139A (en) * | 2006-06-15 | 2007-05-23 | 华为技术有限公司 | Subscriber contract information processing method and apparatus in strategy and charging control |
| CN101047874A (en) * | 2006-03-31 | 2007-10-03 | 华为技术有限公司 | Decision method for service information in mobile communication network |
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| CN101047874A (en) * | 2006-03-31 | 2007-10-03 | 华为技术有限公司 | Decision method for service information in mobile communication network |
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