CN104185220A - IMS (IP Multimedia Subsystem) core network equipment failure switching method and border access controller - Google Patents
IMS (IP Multimedia Subsystem) core network equipment failure switching method and border access controller Download PDFInfo
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Abstract
The invention discloses an IMS (IP Multimedia Subsystem) core network equipment failure switching method and a border access controller, and relates to the mobile internet field. According to the method, the border access controller (BAC) determines failure of a core network element, the received registered heartbeat message of an IMS user attached to the core network element is forwarded to the core network to carry out process registration again, and the IMS user on the core network element is attached to a new core network element. According to the method and the controller, through carrying out optimization on the message processing process on the BAC in view of IMS network equipment failure, the waiting time of the user in a registration refresh cycle is reduced, quick service recovery of the IMS user can be realized, and the problem of long-time suspension of the IMS user service can be solved.
Description
Technical field
The present invention relates to mobile Internet field, particularly a kind of IMS(IP Multimedia Subsystem, IP Multimedia System) equipment of the core network failover method and edge access control appliance.
Background technology
[1] IMS brief introduction
IMS is IP multimedia system, is a kind of brand-new multimedia service form, and it can meet, and present terminal client is more novel, the demand of more diversified multimedia service.At present, IMS is considered to the core technology of next generation network, is also to solve mobile and fixed network fusion, introduces the important way of the differentiated services such as voice, data, video Triple Fusion.
The feature of IMS technology maximum is that the business in traditional communication system, control and access part are separated completely, become separately an individual system, between each system, with the interface of unified standard, connect, such structure can simplified network structure, reduce investment outlay, be easy to management.
The architectural framework of IMS is illustrated in fig. 1 shown below:
The major function entity of IMS is CSCF CSCF(Call Session Control Function, CSCF), CSCF is divided three classes, respectively P(Proxy, agency)-CSCF, I(Interrogating, inquiry)-CSCF and S(Serving, service)-CSCF.
P-CSCF: Proxy-Call Session Control Function, it is proxy server, for all terminals provide access point, the signaling of all types of terminal equipments all will be passed through P-CSCF, by P-CSCF, convert thereof into SIP(Session Initiation Protocol, session initiation protocol) signaling, access IMS network.
I-CSCF: inquiry-CSCF, be actually first access point of local network, it is responsible for forwarding call request to suitable S-CSCF, it can remove to inquire HSS(Home Subscriber Server, home subscriber server), which S-CSCF is applicable to service, and this is called out, and then forwards this calling to S-CSCF.
S-CSCF: business-CSCF, the service that provides user to ask for user, as help user to find called subscriber.It can obtain user's configuration information from HSS, know what service user has subscribed to, remove again to access corresponding AS(Application Server, application server), allow AS that concrete service is provided, it is a positioning service person just, be not to provide person, an IMS network has allowed a plurality of S-CSCF, and each can have different abilities, and HSS can be according to user's the configuration information S-CSCF suitable for he distributes.
Other important functional entitys have HSS, are responsible for preserving user data and user's service contracting data.AS, stores and carries out service logic, and various IMS business are provided.
[2] BAC brief introduction
Edge access control appliance (Border Access Controller, BAC), between IMS core network and IMS user, for the user under multiple network environment provides service access and intercommunication; Realize the functions such as security protection, media management simultaneously, and coordinate bearer network to realize QoS(service quality) management.Fig. 2 illustrates the position view of BAC in IMS framework.
The above-mentioned functions of BAC is realized jointly by following functional module: functional module interface, signaling processing module, media interconnecting module, safety protection module, QoS module, route and resource control and management module, network management module.Fig. 3 illustrates BAC high-level schematic functional block diagram.
The Core Feature of BAC, for realizing the intercommunication of customer service under different network environments, realizes the switching of media, and route and resource control and management function are assisted and realized Quality of Service security function, and core net is realized to safety protection function etc.
The network interworking of different network environments specifically comprises following three kinds of situations: user in private network, IMS core net in public network; User in public network, IMS core network in private network; User is in private network, and IMS core net is in another private network.BAC can support that IMS/ soft switch service is in the FW/NAT(Network of user network side Address Transformation, network address translation) pass through.
Aspect media conversion, BAC should support the control and management to Media Stream, can realize the functions such as switching control to media, statistics, analysis, bandwidth control.
BAC also will carry out correct route and carry out resource management message.To message such as the registration of excess, callings, BAC should screen and process, and excessive message can not be forwarded to core net.BAC is upper should be able to define corresponding resource control strategy.
The processed of BAC supported data bag and QoS mark function.BAC is as Policy Enforcement Point and RACS(Resource and Admission Control Sub-system) policy controlling system carry out alternately, and the function of carrying out dynamic QoS strategy wouldn't require.
BAC, as the application layer firewall of user access networks and IMS core net, can realize the security protection to IMS core net.
[3] IMS user's registration and heartbeat
In IMS network, user by BAC to registers kernel network.Concerning user, core net is sightless, and user sends registration message to BAC.BAC is user's proxy server, and it forwards the message being subject to core net, and forwards to user the response that core net is replied.
Fig. 4 illustrates the signalling diagram that registration message is processed.As shown in Figure 4, user's registration generally can be reinstated authentication functions, the registration process that is user needs two registration messages (Register), be first registration message, with second registration message, first registration message sends to core net by user's account, initiate registration request, network notifies user will carry out authentication with 401 responses, authentication information sends core net in second registration message, after authentication is passed through, core net sends the response of succeeding in registration to registered user again, response heavily can comprise one and cross time value expire, the effective time that represents this registration.User must send registration refresh message before mistake time value expires, and keeps user effective in the registration of core net.Otherwise user will be considered as registration by network and lose efficacy.
After user has registered, user can periodically send the registration message that registration refreshes before term of validity expires, and keeps registration effectively.
In addition, in IMS network, between user and BAC, also need to keep heartbeat.This heartbeat also can adopt registration message, and the object of this heartbeat is the validity that user checks BAC, when BAC lost efficacy, can reselect standby BAC and continue to obtain service.For this type of registration message, BAC can separate with registration flush zone, directly, with such message of the local response of 200OK, to core net, does not forward.BAC by timer distinguish registration refresh or BAC and user between heartbeat message.When timer arrives registration refresh time, judge that it is that registration refreshes that this registration disappears, to forwarded.And also arrive the registration message of registering before refreshing, it is all the heartbeat between BAC and user.When adopting registration as heartbeat, BAC term of validity value expire when sending response to user is rewritten as the value (generally shorter, as 5 minutes) of heart beat cycle.By the timer on BAC, determine that the registration message of receiving is to reply or to refresh to core net and forward as registration as heartbeat is local.
[4] backup of IMS network disaster tolerance realizes
In IMS network, common crucial network element need to configure a plurality of, realizes disaster-tolerant backup when carrying out load balancing.When network element is as P-CSCF, when S-CSCF lost efficacy, user need to realize adhering on the network element of new backup by the process of registration, and the service that could realize is switched, and regains service.
(1) load sharing, the disaster-tolerant backup between BAC and first line of a couplet P-CSCF
BAC is configurable P-CSCF group in routing policy, in group, between P-CSCF, can define occupation mode flexibly, comprises that polling is shared, weighting is shared and active/standby mode.
Fig. 5 illustrates load sharing and the disaster-tolerant backup schematic diagram of P-CSCF.As be set to load sharing mode, all initial registration message are balanced distribution between BAC, once certain P-CSCF that passes through of user is registered to core net, all subsequent registration message of this terminal and other message all should be sent to current P-CSCF, realize the interior durable attachment to P-CSCF of the same registration period of terminal until P-CSCF breaks down.When adopting load sharing mode, as one of them P-CSCF lost efficacy, initial registration message or registration refresh message should carry out load sharing between other P-CSCF in P-CSCF group.
(2) many S-CSCF disaster tolerance
In IMS network, generally can dispose a plurality of S-CSCF, between a plurality of S-CSCF, share service, when a S-CSCF lost efficacy, other S-CSCF still can provide service.By I-CSCF, come for the suitable S-CSCF of user assignment.When user's registration message sends to after P-CSCF, P-CSCF is forwarded to message the I-CSCF of home domain according to the domain name of user's registration, I-CSCF is forwarded to suitable S-CSCF by user's registration request, and user after register and authentication completes on S-CSCF, provides all services by this S-CSCF.When this S-CSCF lost efficacy, user must could be realized and adhering to by new register flow path on new S-CSCF, regains service.Because user's message is sent to original S-CSCF, the machine if S-CSCF delays, user or a meeting be sent out message to original S-CSCF, only have register flow path, just can tell the available S-CSCF that user is new.
Current, when P-CSCF1 lost efficacy, BAC must wait until that user registers the process that refreshes and arrives, the registration message that registration could be refreshed sends to core net, now BAC can not be sensible to the conventional route of P-CSCF1, from alternate routing, send to standby P-CSCF2, and by standby P-CSCF2, through I-CSCF, to S-CSCF, register.After completing, register flow path regains adhering on standby P-CSCF2.But, owing to must waiting for a registration refresh cycle, may cause user to hang within a period of time, cannot obtain any service.Because before new registration period, P-CSCF2 cannot obtain user related information by registration message flow process, user cannot realize adhering on P-CSCF2, and at this moment original P-CSCF had lost efficacy, so user has been hung, if the cycle that registration message arranges is shorter, new registration message can upgrade the P-CSCF of service quickly for user.Registration period setting is longer, and this phenomenon is more outstanding.Fig. 6 A illustrates P-CSCF failover flow process.
Same, when the S-CSCF for user's service lost efficacy, also must wait for a registration refresh cycle, by next one registration refresh flow, realize new S-CSCF and select.Registration refresh message, through P-CSCF, after I-CSCF, is forwarded to distributed new S-CSCF, on new S-CSCF, adheres to.Fig. 6 B illustrates S-CSCF failover flow process.
Summary of the invention
The present inventor finds to have problems in above-mentioned prior art, and therefore at least one problem in described problem, has proposed a kind of new technical scheme.
An object of the present invention is to provide a kind of technical scheme for IMS equipment of the core network failover.
According to a first aspect of the invention, provide a kind of IMS equipment of the core network failover method, having comprised:
Edge access control appliance BAC determines that core network element lost efficacy;
BAC receives the registration message that is attached to the IMS user on core network element, and registration message comprises that registration heartbeat and registration refresh;
BAC forwards to re-start registration procedure by IMS user's registration heartbeat message to core net, and the IMS user on core network element is attached on new core network element.
Alternatively, core network element is P-CSCF;
Edge access control appliance BAC determines that core network element inefficacy comprises:
BAC regularly sends OPTIONS message to core network element;
If BAC does not receive the 200OK response from core network element, determine that core network element lost efficacy.
Alternatively, core network element is S-CSCF;
BAC determines that core network element inefficacy comprises:
Whether BAC detects S-CSCF according to the NE-level testing mechanism between P-CSCF and S-CSCF and lost efficacy.
Alternatively, core network element is P-CSCF;
BAC forwards to re-start registration procedure by IMS user's registration heartbeat message to core net and comprises:
BAC is sent to standby P-CSCF through alternate routing by IMS user's registration heartbeat, via standby P-CSCF, completes new registers kernel network authorizing procedure;
IMS user on core network element is attached on new core network element and is comprised:
IMS user on core network element is attached on standby P-CSCF.
Alternatively, core network element is S-CSCF;
BAC forwards to re-start registration procedure by IMS user's registration heartbeat message to core net and comprises:
BAC forwards IMS user's registration heartbeat message to core net;
By I-CSCF, select new S-CSCF, via new S-CSCF, complete registration procedure;
IMS user on core network element is attached on new core network element and is comprised:
IMS user on core network element is attached on new S-CSCF.
According to a further aspect in the invention, provide a kind of edge access control appliance, comprising:
Network element inefficacy determining unit, for determining that core network element lost efficacy;
Registration message receiving element, for receiving the registration message that is attached to the IMS user on core network element, registration message comprises that registration heartbeat and registration refresh;
Registered unit, for IMS user's registration heartbeat message is forwarded to re-start registration procedure to core net, and the IMS user on core network element has been attached on new core network element.
Alternatively, core network element is P-CSCF; Network element inefficacy determining unit is for regularly sending OPTIONS message to core network element; If do not receive the 200OK response from core network element, determine that core network element lost efficacy.
Alternatively, core network element is S-CSCF; Whether network element inefficacy determining unit lost efficacy for detecting S-CSCF according to the NE-level testing mechanism between P-CSCF and S-CSCF.P-CSCF and BAC close establish or P-CSCF and BAC between there is information exchange when mechanism, BAC also can be known the state of S-CSCF.
Alternatively, core network element is P-CSCF; Registered unit, through alternate routing, IMS user's registration heartbeat has been sent to standby P-CSCF, via standby P-CSCF, completed new registers kernel network authorizing procedure, the IMS user on core network element has been attached on standby P-CSCF.
Alternatively, core network element is S-CSCF; Registered unit IMS user's registration heartbeat message has been forwarded to core net, by I-CSCF, selected new S-CSCF, via new S-CSCF, completed registration procedure, the IMS user on core network element has been attached on new S-CSCF.
An advantage of the present invention is, when failover appears in equipment of the core network, directly registration heartbeat message is forwarded to core net and carries out identification log flow process, makes IMS terminal from disabling devices, remove and adhere to fast, on new equipment, again adheres to.
By the detailed description to exemplary embodiment of the present invention referring to accompanying drawing, it is clear that further feature of the present invention and advantage thereof will become.
Accompanying drawing explanation
The accompanying drawing that forms a part for specification has been described embodiments of the invention, and together with the description for explaining principle of the present invention.
With reference to accompanying drawing, according to detailed description below, can more be expressly understood the present invention, wherein:
Fig. 1 illustrates IMS system architecture schematic diagram.
Fig. 2 illustrates the position view of BAC in IMS framework.
Fig. 3 illustrates the high-level schematic functional block diagram of BAC.
Fig. 4 illustrates the signalling diagram that registration message is processed.
Fig. 5 illustrates load sharing and the disaster-tolerant backup schematic diagram of P-CSCF.
Fig. 6 A illustrates P-CSCF failover flow process.
Fig. 6 B illustrates S-CSCF failover flow process.
Fig. 7 illustrates according to the flow chart of an embodiment of IMS equipment of the core network failover method of the present invention.
Fig. 8 illustrates according to the flow chart of an embodiment of IMS core net P-CSCF failover method of the present invention.
Fig. 9 illustrates according to the flow chart of an embodiment of IMS core net S-CSCF failover method of the present invention.
Figure 10 illustrates according to the structure chart of edge access control appliance of the present invention embodiment.
Embodiment
Now with reference to accompanying drawing, describe various exemplary embodiment of the present invention in detail.It should be noted that: unless illustrate in addition, the parts of setting forth in these embodiments and positioned opposite, numeral expression formula and the numerical value of step do not limit the scope of the invention.
, it should be understood that for convenience of description, the size of the various piece shown in accompanying drawing is not to draw according to actual proportionate relationship meanwhile.
To the description only actually of at least one exemplary embodiment, be illustrative below, never as any restriction to the present invention and application or use.
For the known technology of person of ordinary skill in the relevant, method and apparatus, may not discuss in detail, but in suitable situation, described technology, method and apparatus should be regarded as authorizing a part for specification.
In all examples with discussing shown here, it is exemplary that any occurrence should be construed as merely, rather than as restriction.Therefore, other example of exemplary embodiment can have different values.
It should be noted that: in similar label and letter accompanying drawing below, represent similar terms, therefore, once be defined in an a certain Xiang Yi accompanying drawing, in accompanying drawing subsequently, do not need it to be further discussed.
Fig. 7 illustrates according to the flow chart of an embodiment of IMS equipment of the core network failover method of the present invention.
As shown in Figure 7, step 702, edge access control appliance BAC determines that core network element lost efficacy.Core network element is for example P-CSCF or S-CSCF.
Step 704, BAC receives the registration message that is attached to the IMS user on core network element, and registration message comprises that registration heartbeat and registration refresh.
Step 706, BAC forwards to re-start registration procedure by IMS user's registration heartbeat message to core net.That is to say, when BAC receives the registration message that is attached to the IMS user on core network element, even if this registration message is registration heartbeat, also to core net, forward to re-start registration procedure.
Step 708, after registration procedure completes, is attached to the IMS user on core network element on new core network element.
When BAC detects the upper end P-CSCF inefficacy of its distich, the registration heartbeat that is attached to the IMS user on this P-CSCF is forwarded to core net, re-start registration procedure, realize adhering on new P-CSCF, thus quick Resume service.Same, when BAC detects when providing the S-CSCF of service to lose efficacy through the IMS user of this BAC, the registration heartbeat that is attached to the IMS user on this S-CSCF is forwarded to core net, re-start registration procedure, realization adhering on new S-CSCF, thereby quick Resume service.
In above-described embodiment, Message Processing flow process when losing efficacy for the IMS network equipment on BAC is optimized, reduce the period of reservation of number of a registration refresh cycle, realize IMS user's quick service and recover, solve IMS user and serve the dead problem of long-time extension.
In one embodiment, the good primary, spare route of fixed configurations on BAC, BAC is upper is set to a group for the P-CSCF of standby usage.Between BAC and P-CSCF, there is standby usage route, connect respectively active and standby P-CSCF:P-CSCF1 and P-CSCF2.As follows to hanging the idiographic flow that dead IMS user realizes fast quick-recovery when the P-CSCF realizing based on BAC lost efficacy:
(1) BAC and P-CSCF have NE-level to survey mechanism, have detected P-CSCF1 and have lost efficacy.For example, BAC regularly sends OPTIONS message to P-CSCF1, if there is no 200OK response, thinks that P-CSCF1 lost efficacy.
(2) to all registration messages that are attached to the user on P-CSCF1, BAC receives any registration message, comprises registration heartbeat, and registration refreshes, and through alternate routing, is sent to standby P-CSCF2.
(3) through P-CSCF2, complete new registers kernel network authorizing procedure, on P-CSCF2, again adhere to fast.
Fig. 8 illustrates according to the flow chart of an embodiment of IMS core net P-CSCF failover method of the present invention.In this embodiment, P-CSCF1 fault, BAC detects P-CSCF1 fault by the heartbeat message of NE-level, and UE is the user who is attached on P-CSCF1.
As shown in Figure 8, step 801, the registration message (Register) that UE sends as heartbeat when heart beat cycle expires arrives BAC.
Step 802, BAC sends to P-CSCF2 as first registration message by backup path using this registration message
Step 803-804, P-CSCF2 receives this registration message, and forwards to core net, and core net is returned to 401 message to UE, requires to carry out authentication.
Step 805, UE sends second registration message to BAC, in this registration message, carries authentication information.
Step 806, BAC forwards second registration message to P-CSCF2.
Step 807-808, P-CSCF2 receives second registration message, and forwards to core net, and core net authentication completes, and returns to 200OK message, and BAC receives the response 200OK of this registration, keeps user's login state.
By the authorizing procedure of standard, complete adhering on P-CSCF2, the follow-up signaling of user all can forward by the P-CSCF2 newly adhering to.
In one embodiment, between P-CSCF and S-CSCF, there is NE-level testing mechanism, can detect as user provides the S-CSCF of service and whether lose efficacy.For example, exist OPTIONS regularly to survey mechanism between P-CSCF and S-CSCF, P-CSCF regularly sends OPTIONS message to S-CSCF, if S-CSCF is expired, does not reply, and thinks that S-CSCF lost efficacy.
When S-CSCF lost efficacy, the flow process of the fast quick-recovery of IMS terminal is as follows:
(1) P-CSCF and BAC close establish or P-CSCF and BAC between there is information exchange when mechanism, BAC can be known from P-CSCF the state of S-CSCF1, determines that S-CSCF1 lost efficacy.
(2) BAC starts Quick-return mechanism, to all users that service is provided by this S-CSCF1, receives any registration message, comprises registration heartbeat, and registration refreshes, and is sent to core net, the S-CSCF2 that can be used by I-CSCF gravity treatment.The S-CSCF that the upper configured in advance of I-CSCF can be selected.On I-CSCF, there is the list of available S-CSCF.
(3) user completes after new registers kernel network authorizing procedure, realize at new S-CSCF, i.e. S-CSCF2, on adhere to.When registration completes smoothly, S-CSCF beams back 200OK message, and the inside will attach the information into the S-CSCF of this user's service, and P-CSCF stores this information.
In above-described embodiment, edge access control appliance based on IMS is by the detecting of the availability of associated P-CSCF/S-CSCF and the processing of heartbeat message, and the handling process of improving heartbeat message is while having realized equipment of the core network failover, the fast quick-recovery of IMS user's service, solves IMS user and is hung for a long time dead problem.
Fig. 9 illustrates according to the flow chart of an embodiment of IMS core net S-CSCF failover method of the present invention.In this embodiment, P-CSCF1 fault, BAC detects S-CSCF1 fault by the heartbeat message of NE-level; UE is the user who is attached on S-CSCF1.When S-CSCF lost efficacy, IMS user's fast quick-recovery flow process is as follows:
Step 901, UE sends registration message as heartbeat to BAC at heart beat cycle.
Step 902, BAC sends to P-CSCF1 by this registration message.
Step 903, P-CSCF1 receives this registration message, and forwards to core net.
Step 904, I-CSCF receives this registration message, I-CSCF, for user selects new S-CSCF, returns to 401 message to UE, requires to carry out authentication.
Step 905, UE sends second registration message to BAC, in this registration message, carries authentication information.
Step 906, BAC is transmitted to P-CSCF1 by the registration message of reception.
Step 907, P-CSCF1 receives registration message, to core net, forwards this registration message.
Step 908, I-CSCF issues S-CSCF2 by the registration message of reception, and authentication success, returns to 200OK message, and user completes adhering on S-CSCF2.
BAC receives the response 200OK of this registration, keeps user's login state, and S-CSCF2 is successfully the new S-CSCF of user's service.
Figure 10 illustrates according to the structure chart of edge access control appliance of the present invention embodiment.As shown in figure 10, this edge access control appliance comprises: network element inefficacy determining unit 101, for determining that core network element lost efficacy; Registration message receiving element 102, for receiving the registration message that is attached to the IMS user on core network element, registration message comprises that registration heartbeat and registration refresh; Registered unit 103, for IMS user's registration heartbeat message is forwarded to re-start registration procedure to core net, and the IMS user on core network element has been attached on new core network element.
In one embodiment, core network element is P-CSCF; Network element inefficacy determining unit is for regularly sending OPTIONS message to core network element; If do not receive the 200OK response from core network element, determine that core network element lost efficacy.
In one embodiment, core network element is S-CSCF; Whether network element inefficacy determining unit lost efficacy for detecting S-CSCF according to the NE-level testing mechanism between P-CSCF and S-CSCF.
In one embodiment, core network element is P-CSCF; Registered unit, through alternate routing, IMS user's registration heartbeat has been sent to standby P-CSCF, via standby P-CSCF, completed new registers kernel network authorizing procedure, the IMS user on core network element has been attached on standby P-CSCF.
In one embodiment, core network element is S-CSCF; Registered unit IMS user's registration heartbeat message has been forwarded to core net, by I-CSCF, selected new S-CSCF, via new S-CSCF, completed registration procedure, the IMS user on core network element has been attached on new S-CSCF.
An advantage of the present invention is, when failover appears in equipment of the core network, directly registration heartbeat message is forwarded to core net and carries out identification log flow process, makes IMS terminal from disabling devices, remove and adhere to fast, on new equipment, again adheres to.
With respect to current solution, the time that when method and apparatus of the present invention can shorten IMS network element failover effectively, user is hung, can improve well user's service experience in actual applications, and improve service quality.
So far, described in detail according to IMS equipment of the core network failover method of the present invention and BAC.For fear of covering design of the present invention, details more known in the field are not described.Those skilled in the art, according to description above, can understand how to implement technical scheme disclosed herein completely.
May realize in many ways method and system of the present invention.For example, can realize method and system of the present invention by any combination of software, hardware, firmware or software, hardware, firmware.The said sequence that is used for the step of described method is only in order to describe, and the step of method of the present invention is not limited to above specifically described order, unless otherwise specified.In addition, in certain embodiments, can be also the program being recorded in recording medium by the invention process, these programs comprise for realizing the machine readable instructions of the method according to this invention.Thereby the present invention also covers storage for carrying out the recording medium of the program of the method according to this invention.
Although specific embodiments more of the present invention are had been described in detail by example, it should be appreciated by those skilled in the art, above example is only in order to describe, rather than in order to limit the scope of the invention.It should be appreciated by those skilled in the art, can without departing from the scope and spirit of the present invention, above embodiment be modified.Scope of the present invention is limited by claims.
Claims (10)
1. an IP Multimedia System IMS equipment of the core network failover method, is characterized in that, comprising:
Edge access control appliance BAC determines that core network element lost efficacy;
Described BAC receives the registration message that is attached to the IMS user on described core network element, and described registration message comprises that registration heartbeat and registration refresh;
Described BAC forwards to re-start registration procedure by described IMS user's registration heartbeat message to core net, and the IMS user on described core network element is attached on new core network element.
2. method according to claim 1, is characterized in that, described core network element is Proxy Call Session Control Function P-CSCF;
Described edge access control appliance BAC determines that core network element inefficacy comprises:
Described BAC regularly sends OPTIONS message to described core network element;
If described BAC does not receive the 200OK response from described core network element, determine that described core network element lost efficacy.
3. method according to claim 1, is characterized in that described core network element is service call conversation control function S-CSCF;
Described BAC determines that core network element inefficacy comprises:
Whether described BAC detects S-CSCF according to the NE-level testing mechanism between P-CSCF and S-CSCF and lost efficacy.
4. method according to claim 1, is characterized in that, described core network element is P-CSCF;
Described BAC forwards to re-start registration procedure by described IMS user's registration heartbeat message to core net and comprises:
Described BAC is sent to standby P-CSCF through alternate routing by described IMS user's registration heartbeat, via described standby P-CSCF, completes new registers kernel network authorizing procedure;
Described IMS user on described core network element be attached on new core network element and comprised:
IMS user on described core network element is attached on described standby P-CSCF.
5. method according to claim 1, is characterized in that, described core network element is S-CSCF;
Described BAC forwards to re-start registration procedure by described IMS user's registration heartbeat message to core net and comprises:
Described BAC forwards described IMS user's registration heartbeat message to core net;
By query call conversation control function, I-CSCF selects new S-CSCF, via described new S-CSCF, completes registration procedure;
Described IMS user on described core network element be attached on new core network element and comprised:
IMS user on described core network element is attached on described new S-CSCF.
6. an edge access control appliance, is characterized in that, comprising:
Network element inefficacy determining unit, for determining that core network element lost efficacy;
Registration message receiving element, for receiving the registration message that is attached to the IMS user on described core network element, described registration message comprises that registration heartbeat and registration refresh;
Registered unit, for described IP Multimedia System IMS user's registration heartbeat message is forwarded to re-start registration procedure to core net, and the IMS user on described core network element has been attached on new core network element.
7. equipment according to claim 6, is characterized in that, described core network element is Proxy Call Session Control Function P-CSCF;
Described network element inefficacy determining unit is for regularly sending OPTIONS message to described core network element; If do not receive the 200OK response from described core network element, determine that described core network element lost efficacy.
8. equipment according to claim 6, is characterized in that described core network element is service call conversation control function S-CSCF;
Whether described network element inefficacy determining unit lost efficacy for detecting S-CSCF according to the NE-level testing mechanism between P-CSCF and S-CSCF.
9. equipment according to claim 6, is characterized in that, described core network element is P-CSCF;
Described registration completes unit, through alternate routing, described IMS user's registration heartbeat is sent to standby P-CSCF, via described standby P-CSCF, completes new registers kernel network authorizing procedure, and the IMS user on described core network element is attached on described standby P-CSCF.
10. equipment according to claim 6, is characterized in that, described core network element is S-CSCF;
Described registration completes unit described IMS user's registration heartbeat message is forwarded to core net, by query call conversation control function, I-CSCF selects new S-CSCF, via described new S-CSCF, complete registration procedure, the IMS user on described core network element is attached on described new S-CSCF.
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