CN100456843C - Called service route selecting method - Google Patents
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- CN100456843C CN100456843C CNB2005100782796A CN200510078279A CN100456843C CN 100456843 C CN100456843 C CN 100456843C CN B2005100782796 A CNB2005100782796 A CN B2005100782796A CN 200510078279 A CN200510078279 A CN 200510078279A CN 100456843 C CN100456843 C CN 100456843C
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Abstract
The present invention discloses a called service route selecting method, which comprises: when a user initiates a service call, a routing strategy decision point in a network routes the service to a called party by selecting a circuit switching CS domain or an IP multimedia subsystem IMS domain according to the registered state of the called party in the circuit switching (CS) domain and/or the IP multimedia subsystem (IMS) domain and called service attribute information. When the method of the present invention is used to route the service, routing decision can be carried out according to the called service attribute, the selection requirements of the network routes of different services are satisfied, and the flexible selection of service routes is realized.
Description
Technical field
The present invention relates to moving communicating field, relate in particular to a kind of route selection method of called service.
Background technology
Development along with broadband network, under the promotion of multiple application, normal structure such as 3GPP and 3GPP2 has all successively been released IP-based IP multimedia subsystem, IMS (IMS) framework, and purpose is to use a kind of structure of standardized opening to realize diversified multimedia application in the mobile network.The IMS system is by CSCF (Call Session Control Function, CSCF), MGCF (MediaGateway Control Function, MGCF), media resource function (Multimedia ResourceFunction, MRF) and home signature user server (Home Subscriber Server, HSS) etc. functional entity is formed, wherein CSCF can be divided into serving CSCF (S-CSCF) again, proxy CSCF (P-CSCF) and three logic entities of inquiry CSCF (I-CSCF), S-CSCF is the service switching center of IMS, carry out user's registration management, session control, peace preservation association's speech phase, be in charge of user profile, produce charge information etc.; P-CSCF is the access point of terminal user access to IMS, finishes user access control, finishes two-way forwards between other network nodes of user and IMS, is responsible for QoS control and safety management, produces metering data etc.; I-CSCF is responsible for the intercommunication between the IMS territory, and network topology and configuration are externally hidden in the distribution of management S-CSCF, produce metering data etc.The MGCF control gateway realizes the intercommunication of IMS network and other circuit switching (CS) network, and MRF provides media resource, as the folding and unfolding sound, and encoding and decoding and multimedia conferencing bridge.HSS is the most important database of each user, in store all with signatory relevant information, be used to support each network entity to calling out and the processing of session, specifically comprise: user's sign, numbering and addressing information; User's security information; User position information and user's descriptor etc.Between a plurality of entities in HSS and the network interface is arranged.
Because it is irrelevant that the structure of IMS network has been accomplished with the bottom bearer network, therefore the IMS network of 3GPP definition also can be applied on other packet networks outside the packet field network of 3GPP definition, such as the packet network that defines among the 3GPP2, wlan network, and NGN network etc., realized using the independence and and the independence of access network type of terminal type with the user.
From 3GPP Rel-6 version, 3GPP introduces the Access Network of non-3 GPP access network (for example WLAN) as the 3GPP system, insert the IMS system by these Access Networks, some characteristics that are different from the 3GPP Access Network can be provided, for example: than higher access rate, lower rate etc., therefore, (for example in the situation that has WLAN to cover) under certain conditions, the user can preferentially select these Access Networks to insert the IMS business, following situation will occur like this: some business (for example speech business) can provide by traditional CS territory network, and can provide equally by the IMS territory, and the user might be simultaneously in CS territory and the registration of IMS territory, at this moment, and when the user just needs the network decision is professional to route to the user by which territory when called.
TR 23.806 has proposed a kind of when the user is registered in CS territory and IMS territory simultaneously in existing 3GPP technical research report, realize the method for called service route control, as shown in Figure 1, it no matter is routing inquiry request (issuing attaching position register HLR) from the CS territory, or routing inquiry request (issuing HSS) from the IMS territory, HLR/HSS can be to routing policy decision point (Routing Policy DecisionPoint, RPDP) require further routing decision, RPDP then according to user current registration scenarios and the preference of active user's setting and the strategy of operator in two territories, determines that finally called service is to route to the user from the CS territory or from the IMS territory.
TR 23.806 has proposed another kind when the user is registered in CS territory and IMS territory simultaneously in existing 3GPP technical research report, realizes the method for called service route control, as shown in Figure 2, in this structure, carries out service logic according to following steps:
1. initial address message (IAM) or the call setup message that comes from the GSM network at external network and call initiator place reaches MSC/GMSC;
2. service logic is called, and in the CS territory, gsmSCP can be used as routing policy decision point (PDP); In the IMS territory, PDP can be an application server (AS), and the interface between itself and the S-CSCF adopts ISC interface (Session Initiation Protocol);
3﹠amp; 4.PDP remove to inquire about HLR and HSS to obtain the current login state of user in CS and IMS territory according to service logic;
5﹠amp; 6. based on the strategy of login state and operator, MSC will call out route to the UE in IMS territory or the CS territory;
Similarly, to 12, the IAM message or the INVITE that arrive the IMS system carry out identical processing in step 7.
There is following shortcoming in above-mentioned prior art:
1, network does not have the ability of carrying out routing decision according to the called service attribute, because in present framework, the routing inquiry request that arrives HLR/HSS has shielded the service attribute (for example class of business, load bearing requirements etc.) of called service.
2, the routing policy decision point in the network is not considered ability of user terminal and access network capability when carrying out Route Selection, can not carry out Route Selection neatly according to the termination function that changes day by day and the Added Business of Access Network.
Summary of the invention
The invention provides a kind of called service route selecting method, make network carry out Route Selection neatly according to the called service attribute and in conjunction with ability of user terminal and access network capability information.
The inventive method comprises:
When the user initiates service call, the routing policy decision point in the network according to called in circuit switching (CS) territory and/or the login state in IP Multimedia System (IMS) territory and called service attribute information select by CS territory or IMS territory routing service to called; Wherein
The routing decision inquiry request message that described called service attribute information is initiated to the routing policy decision point by the routing inquiry entity in the network carries.
According to said method of the present invention, in network, preserve a service attribute and the Route Selection table of comparisons, storage service attribute information and corresponding selection route; After the routing policy decision point is received the routing decision query requests that carries business attribute information, inquire about the described service attribute and the Route Selection table of comparisons, obtain to select route according to the called service attribute information.
In the described service attribute and the Route Selection table of comparisons, determine preferred route according to service attribute and the predetermined routing strategy of user or operator.
The described service attribute and the Route Selection table of comparisons are stored in the routing policy decision point, or be stored in one with self contained data base that the routing policy decision point is connected by interface in.
According to said method of the present invention, described routing policy decision point is also selected by CS territory or IMS territory routing service extremely called according to called ability information of user terminal and/or Access Network ability information.
Described ability information of user terminal and access network capability information are stored in presenting in the system of network or the information management module that increases newly in advance.
According to said method of the present invention, in network, preserve a routing table, storage in this table:
Business attribute information;
Ability information of user terminal and/or Access Network ability information; And
The corresponding preferred route of determining in conjunction with the predetermined routing strategy of user or operator;
After the routing policy decision point is received the routing decision query requests that carries business attribute information, obtain ability information of user terminal and/or Access Network ability information system or the information management module from described presenting; And inquire about described routing table according to business attribute information, ability information of user terminal and/or Access Network ability information, obtain to select route.
If showing, the access network capability information of called ability information of user terminal or called current access do not support called service, then this called service is carried out respective handling by the unreachable flow process of business, or send to specific service server processing, or return the failed message that continues to the calling subscriber.
Described called service attribute information includes but not limited to: type of service, QoS of survice type, bit rate, time delay, shake, the error rate and bit error rate one of them or any a plurality of combination of attributes.
Beneficial effect of the present invention is as follows:
1, the present invention is by carrying business attribute information when network entity is initiated the routing decision inquiry request message, make the routing policy decision point can know the called service attribute of this calling, thereby realize carrying out professional Route Selection, satisfy the continuous new business that increases and change better transmitting the selection requirement of net according to service attribute.
2, the present invention can also carry out Route Selection in conjunction with ability information of user terminal and Access Network ability information when carrying out Route Selection according to service attribute, with the selection to professional route of the terminal that satisfies different abilities and Access Network.
3, the present invention can also select route in conjunction with user or operator's requirement when carrying out routing decision, the professional method that provides is provided more flexibly for operator, selects the method for professional presentation mode more flexibly also for the user.
Description of drawings
Fig. 1 is one of prior art called service route control method schematic diagram;
Fig. 2 is two of a prior art called service route control method schematic diagram;
Fig. 3 is the called service route selecting method flow chart of the embodiment of the invention one;
Fig. 4 is the called service route selecting method flow chart of the embodiment of the invention two.
Embodiment
Called service route selecting method provided by the invention comprises: when the user initiates service call, the routing policy decision point in the network according to called in circuit switching (CS) territory and/or the login state in IP Multimedia System (IMS) territory and called service attribute information select by CS territory or IMS territory routing service to called.Wherein the called service attribute information carries by the routing decision inquiry request message of the routing inquiry entity in the network to the initiation of routing policy decision point.The business attribute information of carrying includes but not limited to: the information such as QoS type, bit rate, time delay, shake, the error rate or bit error rate of type of service, business.
The present invention can preserve a service attribute and the Route Selection table of comparisons in advance in network, determine preferred route according to service attribute and the predetermined routing strategy of user or operator; The routing policy decision point is inquired about the described service attribute and the Route Selection table of comparisons according to the called service attribute information after receiving the routing decision query requests that carries business attribute information of network entity initiation, obtains to select route.The described service attribute and the Route Selection table of comparisons are stored in the routing policy decision point, or be stored in one with self contained data base that the routing policy decision point is connected by interface in.
The routing policy decision point can also be selected by CS territory or IMS territory routing service extremely called according to called ability information of user terminal and/or Access Network ability information.Described ability information of user terminal and access network capability information are stored in presenting in the system of network or the information management module that increases newly in advance.Concrete grammar is:
In network, preserve a routing table, storage in this table:
Business attribute information;
Ability information of user terminal and/or Access Network ability information; And
The corresponding preferred route of determining in conjunction with the predetermined routing strategy of user or operator;
After the routing policy decision point is received the routing decision query requests that carries business attribute information that network entity initiates, obtain ability information of user terminal and/or Access Network ability information system or the information management module from described presenting; And inquire about described routing table according to business attribute information, ability information of user terminal and/or Access Network ability information, obtain to select route.
In the said method, if showing, the access network capability information of called current access or called ability information of user terminal do not support called service, then this called service is carried out respective handling by the unreachable flow process of business, or send to specific service server processing, or return the failed message that continues to the calling subscriber.
Ability information of user terminal and access network capability information stores are as follows to the method that presents in system or the information management module that increases newly of network:
Method one: the ability of user terminal and the ability of access network are registered to and present system:
The ability of terminal can be by user terminal to presenting system issue, also can be to present system to inquire about to terminal and obtain.The ability of terminal also can be by network entity on behalf of issuing to presenting system, and when for example the user registered, S-CSCF registered the ability of user terminal to presenting system.Can replace the user to be meant that to the network entity that presents system registry any and user terminal gets in touch, might know the entity of user terminal information, include but not limited to: the 3GPP aaa server, packet data gateway (PDG), HSS/HLR, S-CSCF, mobile switching centre (MSC), the MSC server, Visited Location Registor (VLR), Serving GPRS Support Node (SGSN), Gateway GPRS Support Node (GGSN), GMLC (GMLC).A database can also be set, the ability information of the inside storage user terminal, the user is when presenting system issue about oneself information, can provide terminal or user's identification information to presenting system, index informations such as type information present system and utilize these index informations to go to inquire about and obtain in the database ability information of terminal.This database can be provided with separately, also can be CS territory network entity, IMS network entity or a part that presents system entity, if be provided with separately, then can utilize present interfaces (needing expanded signalling content and parameter) with the interface that presents system, it also can be the interface of redetermination, specific implementation can adopt CAMEL Application Part agreement (CAP), MAP agreement (MAP), far-end dial-in user service authentication protocol (RADIUS), Diameter, the self-defining agreement of initial session protocol (SIP) or other operators.
Need include but not limited to the information about terminal capability that presents system's issue: terminal is supported the ability of VoIP, the wireless capability of terminal, the business support ability of terminal, the disposal ability of terminal.
Terminal ability information can be in following time trigger to presenting system issue: during the new account registration, during the terminal that Adds User under the same IMPU, when terminal capability upgraded, terminal was when registration, when network claims, or any time that is provided with according to user setting/operator.
The ability information of access network can be issued to presenting system by user terminal, also can be issued to presenting system by the entity in the network.
By network entity under the situation that presents system issue access network capability information, when the user is registered to the IMS territory, user terminal can carry the P-Access-Network-Info header field in registration message, in the P-Access-Network-Info header field, comprise access network type and cell id, out of Memory can need according to access network type and cell id Network Search capability database, this database is the module that increases newly, can independently be provided with, also can close and establish with other network entities, comprise closing and establish and specific application server (AS) closes and establishes etc. with S-CSCF.The access network capability information that AS in P-CSCF in the IMS network, S-CSCF and the security domain can obtain being correlated with, the server that presents in the system can obtain this information as AS.If database is independent setting, then can utilize present interfaces (needing expanded signalling content and parameter) with the interface that presents system, also can be the interface of redetermination, specific implementation can adopt the self-defining agreement of existing protocol or other operators.
By user terminal under the situation that presents system issue access network capability information, terminal directly to presenting system's issue about access network capability information, includes but not limited to: access network type, Access Network wireless capability, Access Network sign, cell ID.Also the Access Network capability database can be set separately, storage Access Network ability, user terminal only need be issued essential informations such as the access network sign of its access and cell ID to presenting system, presents system and goes the Access Network capability database to inquire about.
The ability of method two, user terminal and the ability of access network are registered in the information management module:
This information management module is carried out and is similar to the function that presents system, the terminal that receiving terminal and network send and the ability of access network capability information are arranged, oriented terminal and access network capability information inquiry entity provide the ability of corresponding information, the ability of initiatively obtaining terminal and access network capability information is arranged, the ability of active to network entity issue terminal and access network capability information arranged.This information management module can independently be arranged in the network, also can close and establish with other network entities (for example HLR, HSS etc.), if independent the setting, may comprise with the entity of its interface: user terminal, 3GPP aaa server, PDG, HSS/HLR, S-CSCF, MSC, MSC Server, VLR, SGSN, GGSN, GMLC etc., the corresponding interface agreement can be CAP, MAP, RADIUS, Diameter, SIP or other self-defining agreements of operator etc.
Route selection method when with specific embodiment the user being initiated service call is below described in detail.
Referring to Fig. 3, for arriving Home Network, the calling from other IMS network carries out routing inquiry, and called service Route Selection flow process when the IMS territory is inserted specifically comprises:
1, the IMS that comes from other IMS networks calls out, and need be routed to the called subscriber; I-CSCF in the called network initiates routing inquiry to HSS, carries service attribute in routing inquiry message;
2, HSS initiates the routing decision request to routing policy decision point RPDP, in this request, carries called service attribute information (this step realizes by the expansion MAP); Alternatively, in this request message, carry the log-on message of called subscriber in this territory;
3, according to the setting of Virtual network operator, RPDP can select the current registration scenarios in the CS territory of HLR inquiring user;
Preserve ability information of user terminal and/or Access Network ability information in the system if 4 networks present, RPDP can select to present the ability information that system obtains the access network of the ability information of user terminal and/or the current access of user;
5, RPDP carries out routing decision; Concrete grammar is:
In RPDP or in a self contained data base, store a routing table in advance, some records of storage in this option table, every record can comprise following field information: the routing select result of user ID, user preference, carrier policy, business attribute information, ability information of user terminal (optional), access network capability information (optional) and correspondence etc.;
As shown in the table, be a routing table example:
| User ID | User preference | Carrier policy | Service attribute | Terminal capability (optional) | Access network capability terminal capability (optional) | The result of decision |
| The IMSI of user A | Preferential selection is low-cost | The preferential light network of load of selecting | Streaming Media class multimedia service requires bandwidth 384kbps | Dual-mode terminal (is supported the VOIP among the IMS; Support the GSM speech business) | UTRAN； WLAN | From the IMS territory, by the WLAN route |
| The IMSI of user B | Quality of service is preferential | Guarantee best quality of service | The conversation class speech business | Dual-mode terminal (is supported the VOIP among the IMS; Support the GSM speech business) | UTRAN； WLAN | From CS territory route |
| The IMSI of user C | Quality of service is preferential | Guarantee best quality of service | Streaming Media class multimedia service requires bandwidth 128kbps | Common GSM terminal | UTRAN; Do not register at IMS by any Access Network | From CS territory route |
| ... | ... | ... | ... | ... | ... |
RPDP matches corresponding selection route according to the business attribute information of carrying in the routing decision request, the ability information of user terminal that obtains and/or this routing table of access network capability information inquiry from present system;
6, RPDP returns routing decision to HSS and replys, and which territory the notice called service should route to the user by;
7, HSS returns routing inquiry to I-CSCF and replys, and carries the routing iinformation of determining according to current routing decision and carries out follow-up route control for it.
If because ability information of user terminal and access network capability information show when not supporting called service that need carry out respective handling with business by the unreachable flow process of business, or route to specific service server or directly return the failure that continues to the calling subscriber.
Similarly, it is similar to arrive the routing decision flow process in called CS territory.
Route Selection flow process when the application server (PMPDPAS) of employing tactical management-policy decision point was as the routing policy decision point when Fig. 4 inserted calling for the IMS territory specifically comprises:
1, calls out arrival IMS network, need be routed to the called subscriber; After service logic was called, S-CSCF carried out routing inquiry to routing policy decision point PM PDP AS, carries business attribute information in routing inquiry message;
2, PM PDP AS is to the current registration scenarios in the CS territory of HLR inquiring user;
3, PM PDP AS is to the current registration scenarios in the IMS territory of HSS inquiring user;
Preserve ability information of user terminal and/or Access Network ability information in the system if 4 networks present, RPDP can select to present the ability information that system obtains the access network of the ability information of user terminal and/or the current access of user;
5, PM PDP AS carries out routing decision according to called service attribute information or the ability information of user terminal that obtains and Access Network ability information from present system; Concrete grammar can adopt the identical mode of process step among Fig. 35, does not repeat at this;
6, PM PDP AS returns to S-CSCF with the routing decision result, for it called service is carried out further route control.
Similarly, it is similar to arrive the routing decision flow process of called CS network.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (9)
1, a kind of called service route selecting method comprises:
When the user initiates service call, the routing policy decision point in the network according to called in the circuit switching (CS) territory and/or the login state in IP Multimedia System IMS territory and called service attribute information select by CS territory or IMS territory routing service to called; Wherein
The routing decision inquiry request message that described called service attribute information is initiated to the routing policy decision point by the routing inquiry entity in the network carries.
2, the method for claim 1 is characterized in that, preserves a service attribute and the Route Selection table of comparisons in network, storage service attribute information and corresponding selection route; After the routing policy decision point is received the routing decision query requests that carries business attribute information, inquire about the described service attribute and the Route Selection table of comparisons, obtain to select route according to the called service attribute information.
3, method as claimed in claim 2 is characterized in that, in the described service attribute and the Route Selection table of comparisons, determines preferred route according to service attribute and the predetermined routing strategy of user or operator.
4, method as claimed in claim 2 is characterized in that, the described service attribute and the Route Selection table of comparisons are stored in the routing policy decision point, or be stored in one with self contained data base that the routing policy decision point is connected by interface in.
5, the method for claim 1 is characterized in that, described routing policy decision point is also selected by CS territory or IMS territory routing service extremely called according to called ability information of user terminal and/or Access Network ability information.
6, method as claimed in claim 5 is characterized in that, described ability information of user terminal and access network capability information are stored in presenting in the system of network or the information management module that increases newly in advance.
7, method as claimed in claim 6 is characterized in that, preserves a routing table in network, storage in this table:
Business attribute information;
Ability information of user terminal and/or Access Network ability information; And
The corresponding preferred route of determining in conjunction with the predetermined routing strategy of user or operator;
After the routing policy decision point is received the routing decision query requests that carries business attribute information, obtain ability information of user terminal and/or Access Network ability information system or the information management module from described presenting; And inquire about described routing table according to business attribute information, ability information of user terminal and/or Access Network ability information, obtain to select route.
8, method as claimed in claim 5, it is characterized in that, if showing, the access network capability information of called ability information of user terminal or called current access do not support called service, then this called service is carried out respective handling by the unreachable flow process of business, or send to specific service server processing, or return the failed message that continues to the calling subscriber.
9, the method for claim 1, it is characterized in that described called service attribute information includes but not limited to: type of service, QoS of survice type, bit rate, time delay, shake, the error rate and bit error rate one of them or any a plurality of combination of attributes.
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| PCT/CN2006/001239 WO2006131071A1 (en) | 2005-06-07 | 2006-06-07 | A service route control method |
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