CN102571699A

CN102571699A - Method for selecting application server in application server pool and device adopting same

Info

Publication number: CN102571699A
Application number: CN2010105976125A
Authority: CN
Inventors: 王志松; 朱蓉俊; 倪明; 张林林
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2010-12-20
Filing date: 2010-12-20
Publication date: 2012-07-11

Abstract

The invention discloses a method for selecting an application server in an application server pool and a device adopting the same. The method comprises the following steps: the characteristic information of a user corresponds to an application server through selective algorithm of a first server, and the service of the user is forwarded to the application server corresponding to the user. By adopting the invention, supplementary service can be executed through networking method of the application server pool.

Description

In the application server pond, select the method and the device of application server

Technical field

The present invention relates to IP Multimedia System (IMS, IP Multimedia Subsystem), relate in particular to a kind of method and device of in application server pond (AS POOL), selecting application server (AS, Application Server).

Background technology

In order to satisfy the needs of multimedia communication, third generation partner program (3GPP) is organized on the basis of original packet carrying network and has introduced IMS, and IMS can not only provide traditional voice service to the user, also can provide abundant multimedia to experience to the user.

Fig. 1 is the basic framework figure of IMS network.As shown in Figure 1, the main network element of IMS network comprises: controlling call entity (CSCF, Call Session Control Function), home subscriber server (HSS, Home Subscriber Server), AS.

CSCF is divided into three types: proxy CSCF (P-CSCF; Proxy-Call Session ControlFunction), inquiry CSCF (I-CSCF; Interrogating-Call Session Control Function) and serving CSCF (S-CSCF, Serving-Call Session Control Function).P-CSCF can be in the Access Network under the user; Insert first contact network element of IMS network as the user; Initial session protocol (SIP with the user; Session Initiation Protocol) signaling is forwarded to IMS core net (with the signaling protocol of SIP signaling as calling control, the IMS core net comprises network element I-CSCF, S-CSCF, HSS, AS in the IMS network).The I-CSCF (not shown) can realize the function of network internal Information hiding, network enabled safety.S-CSCF realizes basic CCF as the controlling call entity of core, and the interface between S-CSCF and AS is provided.

AS provides miscellaneous service to the user, like basic speech business, and video traffic and supplementary service.Each user's subscription data (subscription data comprises user's user profile and business datum) cooperates CSCF to realize routing function, and authentication, authorization function is provided in the HSS record IMS network.User contracting data is downloaded to S-CSCF from HSS when the user registers, after business datum wherein is downloaded to AS, supplies AS to accomplish customer service and handle used.The service trigger criteria (IFC, Initial Filter Criteria is also referred to as initial filter criteria) that includes the user in the user contracting data includes the address information of the AS that provides professional among the IFC.

In the networking of reality, the software and hardware assembly of device interior all adopts back mechanism, and through distributed design (apparatus assembly that refers to a plurality of identical functions is worked simultaneously) to support large-capacity user and network security.Not only the important software and hardware assembly of device interior has backup and adopts distributed design in this locality, and in the network element rank, all visual plants all usually adopt strange land distributed deployment and remote backup mechanism (often being called long-distance disaster mechanism).

The IMS technology belongs to emerging technology, and present most of telephone subscriber still realizes communication service through existing communication network.The various common communication networks that are used for voice, video communication comprise: traditional PSTN (PSTN; Public Switched Telephone Network), traditional public land mobile network (PLMN, Public Land Mobile Network), intelligent network, VOIP (like agreement H.323, Softswitch technology) or the like.

The 3GPP tissue thinks that the target of IMS core net development is to insert the user of all existing networks; Promptly all existing users unify to insert the IMS core net and enjoy communication service; This requirement means that the user capacity that the IMS core net need be supported can be very huge; Be equivalent to user's sum of all voice, video communication network at present, promptly the equipment in the IMS core net need be supported the user of several hundred million ranks.

Individual equipment supports the user of several hundred million ranks in the active computer technology, to have difficulty; The mode that equipment vendors and Virtual network operator usually adopt a plurality of equipment to bear a part of user respectively reaches the target that the whole network is supported large-capacity user; In addition, the networking mode of a plurality of equipment rooms also need be supported long-distance disaster mechanism.

AS is as the visual plant in the IMS core net, and the most of business in the IMS network all need be passed through AS and handled, so AS needs to consider to support large-capacity user and complete long-distance disaster mechanism in networking.Wherein, most of business of AS processing is transmitted by S-CSCF.

At present, have the networking mode of a kind of AS, be called AS pond (POOL) networking, a plurality of AS constitute a POOL, and are as shown in Figure 2.The characteristics of AS POOL networking mode are that the customer service in the IMS network is born by a plurality of AS jointly, therefore can support large-capacity user and the fail safe that improves network.

Can know that according to prior art in the IMS network, S-CSCF realizes customer service according to AS of IFC searching of user, includes certain AS title (AS Name) among user's the IFC.

Under AS POOL networking mode, a kind of eaily way is in all users' IFC, to specify same AS title concerning Virtual network operator.After S-CSCF received call request, S-CSCF selected one in real AS host name, and call request is transmitted to selected AS.

Suppose to have three AS in the IMS network, its host name is respectively AS-1.COM.CN, AS-2.COM.CN, AS-3.COM.CN.But when Virtual network operator is provided user contracting data to HSS, the AS Name among all users' the IFC all is appointed as AS.COM.CN, this is a virtual AS title.In addition, at the AS title of domain name system (DNS, Domain Name System) configuration virtual corresponding relation, as shown in table 1 with real AS host name.

AS?Name	Host name	Priority
			AS.COM.CN	AS-1.COM.CN	1
	AS-2.COM.CN	1
				AS-3.COM.CN	1

Table 1 DNS ios dhcp sample configuration IOS DHCP

When S-CSCF receives certain registration request from user or call request; S-CSCF knows that through this user's IFC AS Name is AS.COM.CN; Learn corresponding three host name of AS.COM.CN through inquiry DNS then, then S-CSCF selects an AS at random and register requirement or call request is transmitted to selected AS.

Under the existing IFC mechanism of 3GPP, S-CSCF receives that whenever a call request all can carry out inspection IFC obtaining the operation that next jumps AS, and does not all have incidence relation between any twice operation.Will produce following phenomenon like this:

1, user A initiates call request for the first time, and S-CSCF is forwarded to AS-1 at random with call request and carries out business;

2, user A initiates call request for the second time, and S-CSCF is forwarded to AS-2 at random with call request and carries out business.

In basic audio call, this way is no problem.But in a lot of supplementary service scenes, same AS is all passed through in the front and back that require the user repeatedly call request, otherwise business can't carry out, and is professional such as the divert when busy that network side produces.Be exemplified below:

Prerequisite: contracted AS-1 and to have activated divert when busy professional of user A.

Step 1: user A calling party B, S-CSCF is forwarded to AS-1 with the call request of user A, the call setup success;

Step 2: user C calling party A, S-CSCF are that the call request of user A is forwarded to AS-2 with this target, but therefore AS-2 and do not know that user A is in call state at present can't trigger the divert when busy business.

The problems referred to above do not solve, and the POOL networking of AS can't get into actual commercial operation.

It is when S-CSCF receives certain registration request from user or call request for the first time that a solution is arranged; After register requirement or call request are forwarded to certain AS; Public user identity (the PUI of S-CSCF recording user in local data base; Public User Identity) with the incidence relation of AS address, when the second time call request of receiving this user, S-CSCF can directly in local data base, inquire an AS address and call request for the second time is forwarded to this AS like this.This scheme is suitable for for the registered user, and S-CSCF can preserve this incidence relation in user's registration time length; But for non-registered users, S-CSCF need select long time period to preserve this incidence relation, and this scheme violated the requirement of 3GPP standard, promptly carries out according to IFC and triggers AS.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of method and device of in AS POOL, selecting AS, can under AS POOL networking mode, carry out supplementary service.

For achieving the above object, technical scheme of the present invention is achieved in that

A kind of method of in the application server pond, selecting application server; Comprise: first server corresponds to an application server through the algorithm selected with a user's characteristic information, and with said user's business be forwarded to said user's corresponding application server on.

Further, the algorithm of said selection is a hashing algorithm.

Further, said hashing algorithm is a modulo operation.

Further, first server comprises the process that a user's characteristic information corresponds to an application server through modulo operation:

First server carries out delivery with the weight sum of application server in user's the characteristic information application server pond, obtains a mould value; And according to the predetermined said mould value and the corresponding relation of application server, the user that said mould value is corresponding corresponds to said application server.

Further; When handling the Calling Side business, the process that said first server carries out delivery with the weight sum of application server in user's the characteristic information application server pond is: said first server carries out delivery with the weight sum of application server in calling subscriber's the characteristic information application server pond;

When handling the callee side business, the process that said first server carries out delivery with the weight sum of application server in user's the characteristic information application server pond is: said first server carries out delivery with the weight sum of application server in called subscriber's the characteristic information application server pond.

Further, said first server is service call controlled entity or agent application server.

Further, said user's characteristic information is the sign of user's public user identity or the affiliated Access Network of user.

A kind of device of in the application server pond, selecting application server is used for: through the algorithm selected a user's characteristic information is corresponded to an application server, and with said user's business be forwarded to said user's corresponding application server on.

Further, said first server is service call controlled entity or agent application server; Said user's characteristic information is the sign of user's public user identity or the affiliated Access Network of user.

Further, the algorithm of said selection is a modulo operation.

Can find out by above technical scheme; Characteristic information and the corresponding relation of AS of the present invention through setting up the user; Same user's business always is assigned to upward processing of same AS; Thereby allow under AS POOL networking mode, to carry out various supplementary services, can make the POOL networking of AS get into actual commercial operation like this.

Description of drawings

Fig. 1 is the basic framework figure of IMS network in the prior art;

Fig. 2 is the POOL networking mode sketch map of AS in the IMS network in the prior art;

Fig. 3 is for acting on behalf of the schematic flow sheet that AS selects AS in the prior art;

Fig. 4 selects the schematic flow sheet of AS in AS POOL for S-CSCF of the present invention.

Embodiment

Basic thought of the present invention is: first server corresponds to an AS through the algorithm selected with a user's characteristic information, and this user's business is forwarded on the AS corresponding with this user.This method dynamically generates the binding relationship of user and AS, and the result of calculation of dynamic algorithm all is identical for user's per call.

Wherein, first server is S-CSCF or acts on behalf of AS (Rep AS).User's characteristic information can be the sign (ID) of Access Network under user's PUI or the user.The algorithm of selecting can be hashing algorithm, and more specifically, hashing algorithm can be modulo operation.

First server comprises the process that a user's characteristic information corresponds to an application server through modulo operation:

Through some embodiment the corresponding relation of how setting up user and AS through modulo operation is described below.

Embodiment one

Suppose to exist among the AS POOL three AS (as shown in table 1) that capacity is identical; Then the ratio of the weight of these three AS is 1: 1: 1, and the weight sum of these three AS is 3, is to be understood that; S-CSCF should be with user's PUI to 3 deliverys, and the mould value that obtains behind the delivery is 0,1,2.S-CSCF can generate the corresponding relation of AS as shown in table 2 and mould value automatically, and the corresponding relation of AS and mould value does not constitute qualification of the present invention only as an example in the table 2.

Host name	The mould value
		AS-1.COM.CN	0
AS-2.COM.CN	1
		AS-3.COM.CN	2

The corresponding relation one of AS and mould value among the table 2 AS POOL

The PUI that supposes certain user is 52871234,52871234mod 3=2 then, and according to table 2, S-CSCF should be assigned to this user on the AS-2.

Through said method, can make a user and an AS set up corresponding relation, therefore same user's repeatedly call request necessarily can be forwarded to same AS.

Embodiment two

The Capacity Ratio of supposing three AS among the AS POOL is 2: 1: 1; Then the ratio of the weight of these three AS is 2: 1: 1, and the weight sum of these three AS is 4, is to be understood that; S-CSCF should be with user's PUI to mould 4 deliverys, and the mould value that obtains behind the delivery is 0,1,2,3.S-CSCF can generate the corresponding relation of AS as shown in table 3 and mould value automatically.

Host name	The mould value	Weight
			AS-1.COM.CN	0、1	2
AS-2.COM.CN	1	1
			AS-3.COM.CN	2	1

The corresponding relation two of AS and mould value (containing the weight parameter) among the table 3 AS POOL

The PUI that supposes user A is 52871234, and the PUI of user B is 52871235, and the PUI of user C is 52871236, and the PUI of user D is 52871237.This four users' PUI respectively to 4 deliverys, is then obtained:

User A:52871234mod 4=2;

User B:52871235mod 4=3;

User C:52871236mod 4=0;

User D:52871237mod 4=1.

According to The above results, user C, user D will be assigned on the AS-1, and user B will be assigned on the AS-3, and user A will be assigned on the AS-2.

Because user's PUI is unique, from the statistical significance, according to above-mentioned algorithm; With all users' PUI to 4 deliverys after; The number that corresponds to the PUI of

mould value

0,1,2,3 will be about equally, so according to above-mentioned algorithm, can the user be assigned on the AS by weight.And as long as user's PUI is constant, AS number and weight are constant, the mould value that goes out according to above-mentioned algorithm computation is constant, so the corresponding relation of user and AS also is constant.

Embodiment three

Suppose to have three AS (as shown in table 4) among the AS POOL, the ratio of the weight of three AS is 1: 1: 2, and wherein AS-3 is subsequent use AS.Should be appreciated that S-CSCF should be with user's PUI to 2 deliverys, and the mould value that obtains behind the delivery is 0,1.S-CSCF can generate the corresponding relation of AS as shown in table 5 and mould value automatically.

AS?Name	Host name	Priority	Weight
				AS.COM.CN	AS-1.COM.CN	1	1
	AS-2.COM.CN	1	1
					AS-3.COM.CN	2	2

The corresponding relation of AS title that table 4 is virtual and real AS host name

Host name	The mould value
		AS-1.COM.CN	0
AS-2.COM.CN	1

The corresponding relation three of AS and mould value among the table 5 AS POOL

The PUI that supposes user A is 52871234, and the PUI of user B is 52871235, and the PUI of user C is 52871236, and the PUI of user D is 52871237.This four users' PUI respectively to 2 deliverys, is then obtained:

User A:52871234mod 2=0;

User B:52871235mod 2=1;

User C:52871236mod 2=0;

User D:52871237mod 2=1.

According to The above results, user A, user C will be assigned on the AS-1, and user B, user D will be assigned on the AS-2.

The above-mentioned method of salary distribution is applicable to AS-1, AS-2 situation just often.Under the abnormal conditions, suppose that AS-1 breaks down, if the user A request of making a call; S-CSCF gets depanning value 0 with the PUI of user A to 2 deliverys; Should the call request of user A be forwarded to AS-1 in theory, but AS-1 breaks down, so S-CSCF is forwarded to AS-3 with the call request of user A; Equally, the call request of user C also will be forwarded to AS-3.If AS-1 and AS-2 break down, then all users can be assigned on the AS-3.

Suppose all in the foregoing description that PUI is a numeral; Therefore directly PUI is carried out modulo operation; But the ID of Access Network also can be the textual number string under PUI, the user; Therefore need textual number be ganged up and carry out modulo operation again after special algorithm is converted into numeral, the numeral after the conversion is unique in the IMS network.How to convert the textual data word string into numeral is not the emphasis that the present invention discusses, and does not do explanation at this.

On the other hand, in the IMS network, exist a kind of equipment to be called and act on behalf of AS.As shown in Figure 3, when only there are two AS in the IMS network, act on behalf of AS and select the flow process of AS to comprise in the prior art:

Step 301, S-CSCF receives a user's SIP request (SIP Request);

Step 302-303, S-CSCF acts on behalf of AS according to user's one of IFC selection, and SIP is asked to be transmitted to act on behalf of AS;

Step 304 is acted on behalf of AS and is routed to AS-1;

Step 305-307, timer expiry is acted on behalf of AS and is reselected AS-2 and the SIP request is transmitted to AS-2;

Step 308, AS-2 returns sip response (SIP Response).

Can find out that by above flow process S-CSCF can all be transmitted to all register requirement, call request and act on behalf of AS, select AS by acting on behalf of AS.

In the present invention, act on behalf of AS and select the process of AS and S-CSCF to select the process of AS similar, repeat no more at this.In addition, the process of corresponding relation of process and above-mentioned PUI of foundation and AS of corresponding relation of ID and AS of setting up Access Network under the user through modulo operation is similar, repeats no more at this.

Further, handling Calling Side when professional, S-CSCF or act on behalf of AS takes out the calling subscriber from call signaling PUI execution modulo operation; Handling callee side when professional, S-CSCF or act on behalf of AS takes out the called subscriber from call signaling PUI execution modulo operation.

Here, simplified summary is set up the flow process (detailed process can referring to related protocol) of conversation once in the IMS network between two users:

Step a, Calling Side S-CSCF receives calling subscriber's call request, according to calling subscriber's IFC, call request is transmitted to Calling Side AS;

Step b, Calling Side AS are transmitted to Calling Side S-CSCF with call request after finishing for the calling subscriber carries out business;

Step c, Calling Side S-CSCF issues callee side S-CSCF with call request;

Steps d, callee side S-CSCF is transmitted to callee side AS according to called subscriber's IFC with call request;

Step e, callee side AS are transmitted to callee side S-CSCF with call request after finishing for the called subscriber carries out business;

Step f, callee side S-CSCF issues the called subscriber with call request.If the called subscriber returns success response, then calling and called can be conversed.

Further; In user's register flow path; S-CSCF or act on behalf of first PUI (being default PUI) that AS can take out in user concealed registration collection or the another name group and carry out modulo operation from register command as user's characteristic information, thus the repeatedly registration that guarantees the user can both be handled by same AS.

Further; In the IMS network, there are a plurality of S-CSCF or a plurality of AS of agency; These S-CSCF or act on behalf of that AS all can accept customer call and,, can both realize that same user's repeatedly call request is forwarded to the target on the same AS as long as algorithm is consistent for the user selects AS.

Further, allow the certain user just can carry out calling without registration in the IMS network, this calling is called unregistered calling.When the Calling Side of handling unregistered calling is professional, S-CSCF or act on behalf of AS takes out the calling subscriber from call signaling PUI execution modulo operation; When the callee side of handling unregistered calling is professional, S-CSCF or act on behalf of AS takes out the called subscriber from call signaling PUI execution modulo operation.

S-CSCF selects AS in AS POOL a instance is described below.As shown in Figure 4, S-CSCF selects the flow process of AS to comprise:

Step 401, S-CSCF receives a user calling request.

Step 402, S-CSCF from this locality or HSS obtain this user's IFC, and obtain an AS title from IFC.

Step 403-404; S-CSCF is according to this AS name query DNS; Suppose to have disposed on the DNS corresponding relation of AS title shown in the table 1 and real AS host name, then DNS returns three host name: AS-1.COM.CN, AS-2.COM.CN, AS-3.COM.CN to S-CSCF.

S-CSCF produces the AS as shown in table 2 and the corresponding relation of mould value automatically according to the AS host name that DNS returns; In addition, also can adopt mode generation table 2 manual pre-established, automatic foundation, can set up by DNS like the corresponding relation of AS in the table 2 and mould value, and in step 404, return to S-CSCF.

When reality realized, S-CSCF can generate table 2 according to the following steps when receiving three host name from DNS:

Step 1, S-CSCF receives three host name from DNS, it puts in order possibly be AS-3.COM.CN, AS-2.COM.CN, AS-1.COM.CN (this is variable in proper order, does not fix);

Step 2, S-CSCF sorts by character sequence to above-mentioned three host name, obtains sequence: AS-1.COM.CN, AS-2.COM.CN, AS-3.COM.CN;

Step 3 is docile and obedient above-mentioned sequence to preface and is inserted table 2;

Step 4 by the corresponding mould value of each host name of weight generation of each host name in the above-mentioned sequence, is inserted in the table 2.

Step 405, when the Calling Side of handling this calling was professional, S-CSCF takes out the calling subscriber from call signaling PUI carried out modulo operation; When the callee side of handling this calling was professional, S-CSCF takes out the called subscriber from call signaling PUI carried out modulo operation;

The PUI that supposes the calling subscriber is 52871235, and PUI is obtained 0 to 3 deliverys; According to table 2, S-CSCF selects AS-1;

Step 406, S-CSCF is transmitted to AS-1 with call request.

For realizing the above-mentioned method of in AS POOL, selecting AS, the present invention is also corresponding provide a kind of in AS POOL the device of selection AS.This device is arranged in S-CSCF or acts on behalf of AS, and is used for: through the algorithm selected a user's characteristic information is corresponded to an application server, and with said user's business be forwarded to said user's corresponding application server on.The concrete function of this device can repeat no more at this with reference to the description of above-mentioned method.

The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.

Claims

1. method of in the application server pond, selecting application server; It is characterized in that; Said method comprises: first server corresponds to an application server through the algorithm selected with a user's characteristic information, and with said user's business be forwarded to said user's corresponding application server on.

2. the method for in the application server pond, selecting application server according to claim 1 is characterized in that the algorithm of said selection is a hashing algorithm.

3. the method for in the application server pond, selecting application server according to claim 2 is characterized in that said hashing algorithm is a modulo operation.

4. the method for in the application server pond, selecting application server according to claim 3 is characterized in that, first server comprises the process that a user's characteristic information corresponds to an application server through modulo operation:

5. the method for in the application server pond, selecting application server according to claim 4; It is characterized in that; When handling the Calling Side business, the process that said first server carries out delivery with the weight sum of application server in user's the characteristic information application server pond is: said first server carries out delivery with the weight sum of application server in calling subscriber's the characteristic information application server pond;

6. the method for in the application server pond, selecting application server according to claim 1 is characterized in that said first server is service call controlled entity or agent application server.

7. the method for in the application server pond, selecting application server according to claim 1 is characterized in that, said user's characteristic information is the sign of user's public user identity or the affiliated Access Network of user.

8. device of in the application server pond, selecting application server; It is characterized in that; Said device is used for: through the algorithm selected a user's characteristic information is corresponded to an application server, and with said user's business be forwarded to said user's corresponding application server on.

9. the device of in the application server pond, selecting application server according to claim 8 is characterized in that said first server is service call controlled entity or agent application server; Said user's characteristic information is the sign of user's public user identity or the affiliated Access Network of user.

10. the device of in the application server pond, selecting application server according to claim 8 is characterized in that the algorithm of said selection is a modulo operation.