CN101447890B - Improved application server disaster tolerance system of next generation network and method thereof - Google Patents
Improved application server disaster tolerance system of next generation network and method thereof Download PDFInfo
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Abstract
The invention provides an improved application server disaster tolerance system of a next generation network and a method thereof. The method comprises the following steps: a service-call session control function records an incidence relation between address information of a current application server and a subscriber; the service-call session control function receives a service request of the subscriber which is associated with the current application server, and then the service request is triggered to the current application server for processing according to the incidence relation. The system comprises a main application server, one or more spare application server and the service-call session control function. By adopting the technical proposal of the invention, all incidents of one subscriber can be triggered to the current application server for processing, thus avoiding the problem of service loss caused by processing the related services of the subscriber on two or more application servers when the main application server is recovered to normal from the failure.
Description
Technical field
The present invention relates to the communications field, more specifically, relate to that (IP MultimediaSystem IMS) is the system and method for a kind of improved application server disaster tolerance in the next generation network (NGN) of core with IP Multimedia System.
Background technology
Be in the next generation network (NGN) of core with IP Multimedia System (IMS), adopt initial session protocol (SIP) as professional control protocol, every communication service can be cooperated with the application server (AS) by operator's setting in the network by user's intelligent terminal to be finished.
Fig. 1 is that a kind of typical services in the next generation network realizes framework, wherein, application server (AS) (may exist a plurality of, be respectively applied for different business) link to each other with the service-call session control function (S-CSCF) of user attaching network by interface, the professional control messages of SIP between user terminal A and the user terminal B (with dashed lines sign) can be flowed through separately application server (according to the kind of customer service, may pass through different application servers), application server can be by the business of various processing to realize enriching to professional control messages.User terminal A and user terminal B utilize the service message exchange and consult the media parameter that both sides supported, between is set up Media Stream and connected (using solid line), and Media Stream is used for transmitting data such as conversation voice packets.
Be that application server disaster tolerance in the next generation network of core is meant when disaster event takes place with IMS, the function of corresponding business still can be provided for the user.Wherein, typical disaster event comprises natural disaster, as fire, flood, earthquake, hurricane, cyclone, typhoon etc., also has other as originally offering the required service disruption of service operation, as equipment fault, software error, communication network interruption and power failure or the like, and artificial factor such as operator error, destruction, implantation harmful code and attack of terrorism or the like.
The objectives of application server disaster tolerance comprise that the system behind the disaster tolerance can significantly not extend for the time that customer service realizes, the disaster tolerance process reduces artificial intervention as far as possible, keep original service feature behind the disaster tolerance as far as possible, the process of disaster tolerance can not produce large-scale Signalling exchange etc. to system.
Fig. 2 is the solution of a kind of application server disaster tolerance of 3GPP (Third Generation Partnership Project, third generation partner plan) proposition, and its implementation step comprises:
Step 101:S-CSCF receives the SIP request;
Step 102:S-CSCF selects an application server AS 1 according to iFC (initial Filter Criteria, initial filter criteria);
Step 103:S-CSCF is transmitted to AS1 with the SIP request;
Step 104:AS1 is not response within a certain period of time, and S-CSCF detects request timed out;
The server that step 105:S-CSCF inquiry is special, for example, DNS (Domain Name System, domain name system), SLF (Subscription Locator Function, order relations positioning function) etc. obtain the application server of the request can handled and tabulate.This inquiry can be based on information specific among the iFC (for example, Business Name, application server title etc.).
Step 106:DNS returns Query Result to S-CSCF;
Step 107:S-CSCF is transmitted to the application server AS 2 that inquiry is obtained with this SIP request;
Step 108:AS2 carries out concrete service logic by the business information that Sh interface and HSS (Home Subscriber Server, home subscriber server) obtain designated user alternately.
So far, realized when AS1 lost efficacy, the disaster tolerance function of service can be provided by AS2;
There is a problem in this solution, when main normal from failure recovery with AS, and when S-CSCF carries out the AS selection according to session, the user situation of the request of managing business on leading with AS and standby AS respectively can occur, this may cause losing of some business.For example, as shown in Figure 2, when AS1 resumes work, the calling of A will be handled on AS1 again, this just is easy to occur the AS1 calling of paralysis period (A calls out B) and handles on AS2, calling (A calls out C) after AS1 recovers is handled on AS 1, at this moment, if A wishes to realize Three-Way Calling (A, B, C are inserted in the session) or transfer service and (calling of B is transferred to C, make B and C conversation), owing to all have only the information of a calling on AS1 and the AS2, can't carry out the association of two callings, so business can't be finished.
In addition, in the network operation process, might require main with AS from failure recovery normal after, how to switch back to the user who handles on the standby AS temporarily and mainly handle on AS, existing solution fails to address this problem.
Summary of the invention
The technical problem to be solved in the present invention provides the system and method for improved application server disaster tolerance in a kind of next generation network, when main with AS from failure recovery normal after, thereby the business that a user can not occur is handled the situation that causes some loss of traffic on two or more AS.
In order to address the above problem, the invention provides the method for improved application server disaster tolerance in a kind of next generation network, comprising: the address information of service-call session control function recording user current application server and described user's incidence relation; Receive described user's the service request relevant when service-call session control function after, according to described incidence relation described service request is triggered to described current application server and handles with described current application server.
Further, after service-call session control function is received service request from user, check the incidence relation that is write down, if do not write down incidence relation this moment, service-call session control function obtains the address information of application corresponding server by the nslookup system, and sets up and write down the address information of described current application server and described user's incidence relation.
Further, after service-call session control function is received described user's the service request relevant with described current application server, if described current application server lost efficacy, service-call session control function is that described user selects a standby application server by the nslookup system, and upgrade the address information of user's current application server of local record and described user's incidence relation, the address information of wherein current application server is updated to the address of described standby application server.
Further, when described standby application server is known main normal with the application server recovery, and described user is after the business on the described standby application server all disposes, described standby application server sends the switchback indication and is redirected destination address information to service-call session control function, and described redirected destination address information is described main address with application server; After service-call session control function is received described switchback indication and is redirected destination address information, the address information of the current application server in the address information of described user's current application server of local record and described user's the incidence relation is updated to the described main address of using application server.
Further, described standby application server any in the following ways sends the switchback indication and is redirected destination address information to service-call session control function:
The standby application server sends redirect response to service-call session control function, wherein carries described switchback indication and is redirected destination address information;
The standby application server sends the initial session protocol request to service-call session control function, wherein carries described switchback indication and is redirected destination address information.
The present invention also provides the system of improved application server disaster tolerance in a kind of next generation network, comprising: main with application server, one or more standby application server, service-call session control function;
Described main usefulness and standby application server are used for the service request of process user;
It is characterized in that:
Described service-call session control function is used for the address information of recording user current application server and described user's incidence relation; And be used for that the relevant service request of current application server that receive and described user is triggered to described current application server and handle.
Further, service-call session control function is checked the incidence relation that is write down after also being used to receive service request from user, if do not write down incidence relation this moment, service-call session control function obtains the address information of application corresponding server by the nslookup system, and sets up and write down the address information of described current application server and described user's incidence relation.
Further, after described service-call session control function also is used to receive described user's the service request relevant with described current application server, if described current application server lost efficacy, by the nslookup system is that described user selects a standby application server, and upgrade the address information of current application server of local record and described user's incidence relation, the address information of wherein current application server is updated to the address of described standby application server.
Further, described standby application server also is used for, detecting the master and whether recovering normal with application server after described standby application server is set to the current application server with main mutual with application server; And be used for recovering normal and described user sends switchback indication and redirected destination address information to described service-call session control function the business on the described standby application server all disposes after with application server when main;
After described service-call session control function also is used to receive described switchback indication and is redirected destination address information, the address information of the current application server in the address information of described user's current application server and described user's the incidence relation is updated to the described main address of using application server.
Further, described standby application server any in the following ways sends the switchback indication and is redirected destination address information to service-call session control function:
The standby application server sends redirect response to service-call session control function, wherein carries described switchback indication and is redirected destination address information;
The standby application server sends the initial session protocol request to service-call session control function, wherein carries described switchback indication and is redirected destination address information.
In sum, the invention provides the system and method for improved application server disaster tolerance in a kind of next generation network, can realize all relevant all being triggered on the current AS of a user are handled, like this, when leading with AS after failure recovery normally, thereby avoided a user's related service on two or more AS, to handle the problem that causes some loss of traffic, its prioritization scheme can also realize main with AS recover normal after, user's AS is switched back to the main AS that uses from standby AS.
Description of drawings
Fig. 1 is that a kind of typical services in the next generation network realizes framework;
Fig. 2 is the application server disaster tolerance scheme of 3GPP;
Fig. 3 is a system construction drawing of the present invention;
Fig. 4 is the process that the AS address information is related with the user in the method that proposes of the present invention;
Fig. 5 is by the main process that switches to standby AS with AS in the method that proposes of the present invention;
Fig. 6 switches back to main process with AS by standby AS in the method that proposes of the present invention.
Embodiment
The invention provides the system and method for improved application server disaster tolerance in a kind of next generation network, S-CSCF selects AS according to the user, and in the address of local record AS, guarantee that the Business Processing of a user in a period of time all handle on an AS, solved the traffic lost that causes is handled in the related service request on different AS problem; When the master was lost efficacy with AS, S-CSCF can inquire about by modes such as DNS and obtain available standby AS, and service request is triggered to standby AS processing; After the master recovers normally with AS, standby AS can send the switchback indication to S-CSCF in due course according to certain strategy, S-CSCF is by the AS address of this indication change local record, and request is triggered to mainly use AS, professionally switches back to main process with the AS processing from standby AS thereby finish.
Present embodiment provides the system of improved application server disaster tolerance in a kind of next generation network, as shown in Figure 3, comprising: main with AS, one or more standby AS, S-CSCF, HSS and DNS.
Lead the service request that is used for process user with AS, for the user provides service; And be used for HSS alternately, read or revise user's business information;
Standby AS is used for the service request of process user, for the user provides service; And be used for HSS alternately, read or revise user's business information; Also be used for after being set to current AS, detecting the master and whether recovering normal with AS with main mutual with AS; Can also be used for main with AS recover normal and the user after all Business Processing of this locality finish, send the switchback indication and be redirected destination address information to S-CSCF, promptly main address with AS.
S-CSCF is used to the user to select AS, and is used to set up and current AS address information of recording user and user's incidence relation, this incidence relation can but to be not limited to be an incidence relation table; And after being used to receive service request from user, check the incidence relation that is write down, if do not write down incidence relation this moment, S-CSCF obtains the address information of corresponding AS by inquiry DNS, and sets up and write down the address information of current AS and user's incidence relation; Also be used for after this user that to receive service request relevant it being triggered to current AS with current AS; After S-CSCF also is used to receive this user service request relevant with current AS, if current AS lost efficacy, for this user selects a standby AS request of managing business, and upgrade the address information of current AS of local record and user's incidence relation, the address information of wherein current AS is updated to the address of standby AS; Can also be used for after receiving the switchback indication that standby AS sends and being redirected destination address information, the address information of the current AS in current AS address information of user and user's the incidence relation table being changed into the address of the main AS of using.
Current AS is the AS of current process user business, for example, in the present invention, this master was not current AS with AS when the master was lost efficacy with AS, this standby AS was current AS after the master enabled standby AS with the AS inefficacy, main with AS from failure recovery normal after, if choosing main be that the user handles that request is then main to be current AS with AS with AS, as if selecting standby AS to be current AS for the user handles the then standby AS of request.
HSS is used to preserve active user's business information, allows AS to obtain or revise corresponding business information.
DNS is used to preserve the corresponding relation of domain name and AS tabulation, allows S-CSCF to carry out query manipulation, provides foundation for S-CSCF selects AS.
Other network elements in the IMS network, P-CSCF for example, I-CSCF etc. do not have specific (special) requirements in the present invention, therefore, omit relevant process prescription.
Present embodiment also provides the method for improved application server disaster tolerance in a kind of next generation network, below will from AS address and user information correlation, from main switch to standby AS and switch back to AS from standby AS mainly be described in detail the present invention with these three aspects of AS.
Be illustrated in figure 4 as flow chart in the inventive method that the AS address information is related with the user:
Step 201:S-CSCF receives that A calls out the INVITE request of B;
Step 202:S-CSCF checks the initial filter criteria iFC of A, and this moment, the incidence relation of current AS address information and user A was not write down in this locality, and promptly AS address information and party A-subscriber's incidence relation table is empty;
Step 203:S-CSCF obtains the address information of corresponding AS;
Obtain the same prior art of method of the address information of corresponding AS in this step, for example can but to be not limited to be to obtain by inquiry DNS, establish the AS that obtains this moment and be mainly to use AS, and be designated as AS1.
Step 204:S-CSCF sets up and writes down the address information of current AS and the incidence relation of user A, and AS1 is set to current AS, promptly form the address information of AS1 and the incidence relation Table A of user A＜-AS1; After receiving service request from user once more, S-CSCF only needs like this with the address information that can know this user's current AS according to this incidence relation table, and need not as prior art its address information of name query according to AS, because identical title may corresponding a plurality of address informations, so just can't guarantee that all business of user all are triggered on the same AS to handle.
Step 205:S-CSCF is triggered to AS1 with the INVITE request and handles;
Step 206: carry out normal service interaction process, A, B sets up session;
Step 207:S-CSCF receives that A calls out the INVITE request of C;
Step 208:S-CSCF checks the initial filter criteria iFC of A, and according to AS and user's incidence relation Table A＜-AS1, the current AS that determines user A is AS1;
Step 209:S-CSCF is triggered to AS1 with the INVITE request and handles;
Step 210: carry out normal service interaction process, A, C sets up session;
So far, S-CSCF has write down user A and current AS is the incidence relation of AS1 address information, and the relevant calling of user A all handles on the AS1 at current AS, and user A just can realize the business of related a plurality of callings, for example, and Three-Way Calling or switching etc.
Be illustrated in figure 5 as the flow chart that switches to standby AS in the inventive method by the master with AS:
Step 301:S-CSCF receives that A calls out the INVITE request of D;
Step 302:S-CSCF checks the initial filter criteria iFC of A, and according to the incidence relation Table A of AS and user A＜-AS1, the current AS that determines user A is AS1;
Step 303:S-CSCF is triggered to AS1 with the INVITE request and handles;
Step 304: because AS1 temporarily lost efficacy, the INVITE request sends overtime;
Step 305:S-CSC obtains the address information of standby AS, as obtaining the address information of standby AS by inquiry DNS;
Step 306:DNS returns Query Result to S-CSCF, promptly returns the address information of standby AS, and standby AS is designated as AS2;
Step 307:S-CSC upgrades the incidence relation table of current AS and user A, be about to the incidence relation table change into A＜-AS2, promptly the address information of current AS is the address of AS2;
Step 308:S-CSCF sends to AS2 with the INVITE request and handles;
Step 309:AS2 and HSS obtain the business information of user A alternately;
Step 310: carry out normal service interaction process, A, D sets up session;
So far, S-CSCF has realized mainly switching to the process of standby AS with AS, and in AS1 paralysis period, the related service request of user A handles on AS2.
Be illustrated in figure 6 as in the inventive method by standby AS and switch back to main flow chart with AS, when AS1 recovers normal, and all business of A dispose on AS2, and when AS2 determined that at this moment the new request of user A is handled by AS1, specific implementation process was as follows:
Step 401:S-CSCF receives that A calls out the INVITE request of E;
Step 402:S-CSCF checks the initial filter criteria of A, i.e. iFC, and according to AS and user's incidence relation Table A＜-AS2, the current AS that determines user A is AS2;
Step 403:S-CSCF triggers INVITE and asks to handle to AS2, and AS2 knows that AS1 has recovered normally, and the business of A on AS2 all disposes; AS2 carries out the switchback decision-making.
In this step AS2 know AS1 recover normal method can but to be not limited to be that AS1 recovers normal back and sends message to AS2 and inform that AS2 has recovered normal.
Step 404:AS2 sends the switchback indication and is redirected destination address information to S-CSCF, and redirected destination address information is main address with AS1;
AS2 can carry the switchback indication and be redirected destination address by send 305User Proxy redirect response to S-CSCF, also can be to carry the switchback indication and be redirected destination address by send the SIP request to S-CSCF;
Step 405:S-CSCF is according to switchback indication and be redirected destination address information, upgrades current AS and user's incidence relation table, soon this incidence relation table change into A＜-AS1, the address information that is about to current AS is updated to the address of AS1;
Step 406:S-CSCF returns ACK, finishes the session with AS2;
Step 407:S-CSCF triggers INVITE and asks to handle to AS1;
Step 408:AS1 and HSS obtain the business information of user A alternately;
Step 409: carry out normal service interaction process, A, E sets up session;
So far, S-CSCF has realized that standby AS switches back to main process with AS, and the new service request of user A is all handled on AS1 main because mainly be better than standby AS with AS, so full switchback main be more excellent scheme with AS.
In the present invention, do not limit the mechanism that S-CSCF selects alternative AS, can inquire about, can obtain yet by other modes by the DNS mode, for example, static configuration by this locality etc.
The present invention proposes not to be only applicable to the INVITE request, also is applicable to other SIP requests.
Claims (6)
1. the method for improved application server disaster tolerance in the next generation network comprises: the address information of service-call session control function recording user current application server and described user's incidence relation; Receive described user's the service request relevant when service-call session control function after, according to described incidence relation described service request is triggered to described current application server and handles with described current application server;
Wherein, after service-call session control function is received described user's the service request relevant with described current application server, if described current application server lost efficacy, service-call session control function is that described user selects a standby application server by the nslookup system, and upgrade the address information of user's current application server of local record and described user's incidence relation, the address information of wherein current application server is updated to the address of described standby application server;
When described standby application server is known main normal with the application server recovery, and described user is after the business on the described standby application server all disposes, described standby application server sends the switchback indication and is redirected destination address information to service-call session control function, and described redirected destination address information is described main address with application server; After service-call session control function is received described switchback indication and is redirected destination address information, the address information of the current application server in the address information of described user's current application server of local record and described user's the incidence relation is updated to the described main address of using application server.
2. the method for claim 1 is characterized in that, also comprises:
After service-call session control function is received service request from user, check the incidence relation that is write down, if do not write down incidence relation this moment, service-call session control function obtains the address information of application corresponding server by the nslookup system, and sets up and write down the address information of described current application server and described user's incidence relation.
3. the method for claim 1 is characterized in that, also comprises:
Described standby application server any in the following ways sends the switchback indication and is redirected destination address information to service-call session control function:
The standby application server sends redirect response to service-call session control function, wherein carries described switchback indication and is redirected destination address information;
The standby application server sends the initial session protocol request to service-call session control function, wherein carries described switchback indication and is redirected destination address information.
4. the system of improved application server disaster tolerance in the next generation network comprises: main with application server, one or more standby application server, service-call session control function;
Described main usefulness and standby application server are used for the service request of process user;
It is characterized in that:
Described service-call session control function is used for the address information of recording user current application server and described user's incidence relation; And be used for that the relevant service request of current application server that receive and described user is triggered to described current application server and handle;
Wherein, after described service-call session control function also is used to receive described user's the service request relevant with described current application server, if described current application server lost efficacy, by the nslookup system is that described user selects a standby application server, and upgrade the address information of current application server of local record and described user's incidence relation, the address information of wherein current application server is updated to the address of described standby application server;
Described standby application server also is used for, detecting the master and whether recovering normal with application server after described standby application server is set to the current application server with main mutual with application server; And be used for recovering normal and described user sends switchback indication and redirected destination address information to described service-call session control function the business on the described standby application server all disposes after with application server when main;
After described service-call session control function also is used to receive described switchback indication and is redirected destination address information, the address information of the current application server in the address information of described user's current application server and described user's the incidence relation is updated to the described main address of using application server.
5. system as claimed in claim 4 is characterized in that:
Service-call session control function is checked the incidence relation that is write down after also being used to receive service request from user, if do not write down incidence relation this moment, service-call session control function obtains the address information of application corresponding server by the nslookup system, and sets up and write down the address information of described current application server and described user's incidence relation.
6. system as claimed in claim 4 is characterized in that:
Described standby application server any in the following ways sends the switchback indication and is redirected destination address information to service-call session control function:
The standby application server sends redirect response to service-call session control function, wherein carries described switchback indication and is redirected destination address information;
The standby application server sends the initial session protocol request to service-call session control function, wherein carries described switchback indication and is redirected destination address information.
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| EP2293159A1 (en) * | 2009-09-02 | 2011-03-09 | ABB Research Ltd. | Redundant control for a process control system |
| CN102123180A (en) * | 2010-01-08 | 2011-07-13 | 北京中企开源信息技术有限公司 | DNS (Domain Name Server) network structure and domain name resolution method |
| US10063697B2 (en) * | 2011-07-22 | 2018-08-28 | Flextronics Ap, Llc | Home communication center |
| CN103685501A (en) * | 2013-12-06 | 2014-03-26 | 北京奇虎科技有限公司 | Data processing method, device and system |
| CN108011737B (en) * | 2016-10-28 | 2021-06-01 | 华为技术有限公司 | Fault switching method, device and system |
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| CN1905433A (en) * | 2006-08-09 | 2007-01-31 | 华为技术有限公司 | Method and system for improving service reliability |
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| CN1863209A (en) * | 2006-02-10 | 2006-11-15 | 华为技术有限公司 | IMS service triggering method and IMS network |
| CN101079878A (en) * | 2006-05-22 | 2007-11-28 | 华为技术有限公司 | A method and device for network route optimization |
| CN101110756A (en) * | 2006-07-18 | 2008-01-23 | 华为技术有限公司 | Application server distribution method and device |
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