CN1984474B - Method and system for realizing mobile user data safety backup - Google Patents
Method and system for realizing mobile user data safety backup Download PDFInfo
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- CN1984474B CN1984474B CN200610078468A CN200610078468A CN1984474B CN 1984474 B CN1984474 B CN 1984474B CN 200610078468 A CN200610078468 A CN 200610078468A CN 200610078468 A CN200610078468 A CN 200610078468A CN 1984474 B CN1984474 B CN 1984474B
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Abstract
The method comprises: by expanding the MAP protocol between MSC/VLR and HLR, the active VMSC can simultaneously carries the information about the active VMSC and the information about the standby VMSC when user's location is updated; after HLR accepts the location update of active VMSC, it makes operations for the subscriber data in the active VMSC and the subscriber data in the standby VMSC in order to ensure the data consistency between the active VMSC and the standby VMSC; when the active VMSC failures, the standby VMSC has complete data of the active VMSC.
Description
Technical field
The present invention relates to a kind of electrical communication technology, relate in particular to a kind of method and system of mobile user data safety backup.
Background technology
Progress along with information technology, the chip disposal ability is more and more stronger, the integrated level of communication apparatus is more and more higher, single network entity such as VMSC (Visited Mobile Switching Center) can handle increasing user, originally an entity often can only be handled 20 general-purpose families, and even forward 1,000,000,2,000,000 more jumbo directions develop now.
Along with the capacity of single network entity is increasing, the influence that failure caused of single network entity is also increasing, therefore more and more important to the backup of single network entity, by corresponding backup functionality, can be so that after a network entity failure in the network, the backup network entity will be taken over the business of failure network entity, to reduce network entity fail influence that causes to the terminal use and the loss that causes to operator to greatest extent.
At present, mainly contain the following three kind implementations that can adopt with VMSC to the mode of standby VMSC backup user data by main:
(1) main with VMSC not to standby VMSC Backup Data, and only main with the VMSC failure after, take over former main business by standby VMSC with VMSC.
Main make when called when being in originally of the user under the VMSC, the master is broken down with VMSC and is taken over this call business by standby VMSC, then standby VMSC at first needs to recover this user's data from the HLR (attaching position register) at this user place, simultaneously since standby VMSC this moment this user's lane place data not, the paging of the essential initiation of standby VMSC the whole network is to seek this user.Therefore, this implementation will cause bigger standby VMSC and the user data between the HLR to recover signaling traffic, strengthen connecting time, and cause huge processing pressure can for the access side entity, even may cause the paralysis that inserts side entity, and signaling link congested between VMSC and the HLR.
When be in originally main when doing caller first with the user under the VMSC (if do not do called before this, be that network side is not its restore data), the master is broken down with VMSC and is taken over this call business by standby VMSC, and then standby VMSC at first needs to recover this user's data from the HLR at this user place.Can cause bigger standby VMSC and the user data between the HLR to recover signaling traffic like this, strengthen connecting time, may cause the congested of signaling link between VMSC and the HLR equally.
(2) main with VMSC the lane place data to standby VMSC backup user, after the master was with the VMSC failure, standby VMSC took over the business of former master with VMSC, and former master is continued in standby VMSC with the business of VMSC.
Though this scheme main is made when called of the user under the VMSC when being in originally, if the master is broken down with VMSC and is taken over this call business by standby VMSC, corresponding standby VMSC can use the location area information of backup to carry out paging, to avoid the whole network paging, but because standby VMSC does not have data completely, and a lot of called services trigger according to user data, such as called prepayment service, back up VMSC so and still have to recover this user data of users.So still can cause bigger standby VMSC and the user data between the HLR to recover signaling traffic, strengthen connecting time, may cause the congested of signaling link between VMSC and the HLR.
In addition, when be in originally main when doing caller first with the user under the VMSC (if do not do called before this, be that network side is not its restore data), if the master is broken down with VMSC and is taken over this call business by standby VMSC, corresponding standby VMSC at first needs to recover this user's data from the HLR at this user place. and so also can cause bigger standby VMSC and the user data between the HLR to recover signaling traffic, strengthen connecting time, may cause the congested of signaling link between VMSC and the HLR.
(3) set up reliable signaling link between the master is with VMSC and standby VMSC, when the master carried out the user signing contract information change with VMSC, the master initiated independently affairs with VMSC by signaling link, and new contracted user's information is sent to standby VMSC.
In this implementation,, be guaranteed with the data consistency between VMSC and the standby VMSC main for those users that can successfully finish affairs.But because main emergentness with the VMSC failure, and main finiteness with signaling link bandwidth between VMSC and the standby VMSC, existing a kind of may be when the master fails with VMSC, may also have certain customers' data to finish the mutual of main VMSC of using and HLR, promptly also do not finish standby VMSC and main mutual with between the VMSC this moment, the standby VMSC of result gathers around has plenty of old user data.
Simultaneously, on HLR, then may think that the data of VMSC one side have obtained upgrading owing to received main response message with VMSC.
Like this; after the generation master is with the VMSC failure; standby VMSC will still use old user data to carry out Business Processing; just may utilize this leak to swindle for shutting down the user; and, on standby VMSC, can't judge the authenticity of one's own backup user data at all, this moment, system also had no idea to return to conforming state; therefore, this method will cause the fail safe of system to reduce.
Summary of the invention
The purpose of this invention is to provide a kind of method and system that realize mobile user data safety backup, carry out the carrying out safety backup of VMSC data, to guarantee that standby VMSC can obtain reliable Backup Data under main situation with the VMSC failure, to support the Business Processing after standby VMSC takes over.
The objective of the invention is to be achieved through the following technical solutions:
The present invention realizes the method for mobile user contracted data safety backup, comprising:
A, main with the message of Visited Mobile Switching Center VMSC to location register HLR initiation acquisition request user contracting data, and in described message, carry standby VMSC information;
B, HLR realize main with the user contracting data consistency operation among VMSC and the standby VMSC after receiving the main message of sending with VMSC according to the standby VMSC information of carrying in the message.
The message of described acquisition request user contracting data comprises: location update request message.
Described step B comprises:
HLR judges to lead in the message of sending with VMSC whether comprise standby VMSC information, and after determining to comprise, by HLR needs are sent to main user contracting data information with VMSC, send to main VMSC of using and standby VMSC respectively, realize main consistent with the user contracting data among the standby VMSC with VMSC.
Described step B also comprises:
The standby VMSC information that standby VMSC information that B1, HLR will receive and HLR have write down compares, and realizes leading being adjusted into consistent with VMSC with user contracting data among the standby VMSC according to comparative result.
Described step B1 comprises:
B11, different with the standby VMSC information of record if described comparative result is the standby VMSC information received, then HLR will deleting with about data among the former standby VMSC, and user contracting data is sent to the master simultaneously with VMSC and the standby VMSC. that receives
Described step B11 also comprises: write down new standby VMSC information.
Described step also B1 comprises:
B12, identical with the standby VMSC information of receiving as if the standby VMSC of record, then HLR is revised as the user contracting data among the former standby VMSC and need sends to main user contracting data with VMSC, perhaps, after HLR deletes the user contracting data among the former standby VMSC needs are sent to main user contracting data with VMSC and send to standby VMSC; And HLR also sends to needs main user contracting data with VMSC and sends to the main VMSC that uses.
Described step B also comprises:
Judge to lead in the message of sending with VMSC whether comprise standby VMSC information, and when determining not comprise, user contracting data deletion among the standby VMSC that original HLR has been write down by the operation of HLR by the MAP MAP, it is invalid then former standby VMSC information to be changed to.
Method of the present invention preferably also comprises:
HLR deletes, revises the data among the standby VMSC based on the MAP MAP or upgrades operation.
VMSC information of the present invention comprises:
Moving exchanging center MSC number, VLR Visitor Location Register VLR number, DPC DPC or IP address information.
Method of the present invention preferably also comprises:
The main VMSC that uses is to standby VMSC backup user contracting data.
The present invention realizes the system of mobile user contracted data safety backup, comprising:
Standby VMSC information sends processing unit, is arranged at mainly with among the VMSC, be used for the time to the request message of HLR request user contracting data, with corresponding standby VMSC information-bearing in described request message, and transmission;
User contracting data back-up processing unit is arranged among the HLR, is used for communicating by letter with corresponding standby VMSC according to the information of the standby VMSC that leads the request message of sending with VMSC, and upgrades the relative users subscription data of wherein preserving.
Described user contracting data back-up processing unit comprises:
Standby VMSC information identificating unit is used for identifying the standby VMSC information that the main request message of sending with VMSC carries, and passes to the information comparing unit;
The information comparing unit is used for comparing with VMSC standby VMSC information of sending and the former standby VMSC information that HLR preserves main, and comparative result is passed to user contracting data renewal processing unit;
User contracting data upgrades processing unit, is used for according to described comparative result the user contracting data information of standby VMSC being upgraded operation, realizes main consistent with user contracting data among VMSC and the standby VMSC.
Described user contracting data upgrades processing unit and comprises: deletion action unit and retouching operation unit, perhaps, deletion action unit and user contracting data transmitting element, wherein:
The deletion action unit, be used for when the former standby VMSC information inconsistency of standby VMSC information of determining to send and preservation, delete the relative users subscription data among the former standby VMSC, perhaps, be used for when the main request message of sending with VMSC does not carry standby VMSC information, delete the relative users subscription data among the former standby VMSC, perhaps, be used for deleting the relative users subscription data information of leading the standby VMSC that sends with VMSC;
The retouching operation unit, if the relative users subscription data information deletion among the standby VMSC that sends with VMSC will not led in the deletion action unit, then the user contracting data among the standby VMSC will be revised in the retouching operation unit;
The user contracting data transmitting element if the relative users subscription data information of leading among the standby VMSC that sends with VMSC is deleted by the deletion action unit controls, then sends to standby VMSC by the user contracting data transmitting element with corresponding user contracting data.
As seen from the above technical solution provided by the invention, the method for realization mobile user data safety backup of the present invention with the synchronous points of HLR as user contracting data, has realized main consistency with user data between VMSC and the standby VMSC.With the VMSC failure, after standby VMSC took over the network entity and user of former master with VMSC control, standby VMSC had former main complete subscription data with VMSC user when main, and the business of the acceptance periphery network entity that standby VMSC can be level and smooth is switched.Because the present invention also has the process of a main VMSC of using to standby VMSC backup user contracting data, under the loss full backup data conditions, still can have the partial data of master again with VMSC when the unexpected collapse of standby VMSC.
Description of drawings
Fig. 1 guarantees main schematic diagram with VMSC and standby VMSC contracted user consistency on messaging for the present invention by HLR;
Fig. 2 is the process chart of the preferable embodiment of the present invention;
Fig. 3 is the system block diagram of the preferable embodiment of the present invention.
Embodiment
Core of the present invention has provided a kind of method that realizes mobile user data safety backup, carry out the carrying out safety backup of VMSC data, to guarantee that standby VMSC can obtain reliable Backup Data under main situation with the VMSC failure, to support the Business Processing after standby VMSC takes over.
Specifically, the present invention is by MAP (MAP) agreement between expansion MSC/VLR and the HLR, make the winner with VMSC (Visited Mobile Switching Center) can be in the message of acquisition request user contracting data, with main MSC (mobile switching centre) with VMSC, the MSC of VLR (VLR Visitor Location Register) number and standby VMSC, VLR number is all told to HLR (location register), if HLR accepts main request with VMSC, then when the master is operated with the user data among the VMSC, the user data among the standby VMSC is operated, thereby guaranteed main data consistency with VMSC and standby VMSC by HLR.
When the master used the message of VMSC acquisition request user contracting data, to initiate position updating request for for example shown in Figure 1, the processing procedure of the realization mobile user data safety backup in the method for the present invention specifically comprised:
Step 11: when main when initiating position updating request with VMSC, in position updating request simultaneously with on MSC number and the VLR number of main MSC number, VLR number and standby VMSC with VMSC;
Step 12:, then this user data of users is sent to the main VMSC that uses if HLR accepts this user's position updating request;
Step 13: also this user data of users is sent to standby VMSC.
Need to prove, step 12 and step 13 are separate, there are not time and logical relation between the two, transmit for the data between HLR and the standby VMSC, can increase an alternative standby VMSC user data operation indication, incense is used with VMSC, makes standby VMSC can judge that the operation of being carried out is normal running or backup operation;
Step 14: the master returns response message to HLR after receiving data with VMSC.
Step 15: same, standby VMSC also can return response message to HLR after receiving data, with the user data information of determining to receive that HLR sends.
In like manner, step 14 and step 15 also are separate, do not have time and logical relation between the two.
In a word, when the subscription data of user among the HLR has any variation, then HLR need send the operation that user data (being user's subscription data) upgrades with VMSC to main, among the present invention, when HLR to main the time with the VMSC transmit operation, also need also to initiate same operation, thereby guarantee main with the guarantee consistency of user data of VMSC and standby VMSC to standby VMSC.
For ease of the present invention there being further understanding, the present invention will be described in detail below in conjunction with accompanying drawing and corresponding specific embodiment.
As shown in Figure 2, the processing procedure of the specific embodiment of the realization mobile user data safety backup in the method for the present invention specifically comprises:
When the user when new master registers with VMSC,
Step 21: the master initiates position updating request with VMSC to HLR and carries main with VMSC information and standby VMSC information simultaneously.
Like this, HLR also can operate the user data among the standby VMSC when the master is operated with the user data among the VMSC, to guarantee the unanimity of both data, needs to carry out for this reason:
Step 22:HLR judges whether carry standby VMSC information in the position updating request, if carry, then execution in step 24, otherwise, execution in step 23;
Step 23: if in location update message, do not carry the information of standby VMSC, then HLR thinks that new VMSC does not support standby VMSC, if write down original effective standby VMSC information in the HLR user profile, the then user contracting data deletion among the operation of HLR by MAP the standby VMSC that original HLR has been write down, it is invalid then former standby VMSC information to be changed to.
The purpose of carrying out step 22 and step 23 is, do not support at new VMSC under the situation of standby VMSC, if write down original effective standby VMSC information in the HLR user profile, then HLR has no way of judging whether user data is credible among the former standby VMSC, it is invalid that be changed to former standby VMSC information this moment, to guarantee the consistency of system.
Step 24: if in location update message, carried the information of standby VMSC, then: at first, with the standby VMSC information that write down among the information of the standby VMSC that carries and the original HLR relatively; Step 25: judge whether two standby VMSC information are consistent, if consistent, then execution in step 26, otherwise, execution in step 27;
Step 26: needs are sent to main user data with VMSC send to this standby VMSC;
Need to prove, specifically can directly new HLR data be write among the former standby VMSC by the retouching operation of MAP, perhaps, also can delete this user data among the former standby VMSC by the deletion action of MAP, afterwards, insertion by MAP operation is write this user data among the original standby VMSC from HLR again, thereby realizes among the standby VMSC the consistent of user data in the user data and main usefulness VMSC.
Step 27:HLR deletes the user data among the former standby VMSC by the operation of MAP, simultaneously corresponding user data is written among the new standby VMSC, and writes down this new standby VMSC information.
In step 26 and step 27, also need corresponding user data be sent to the main VMSC that uses by HLR, corresponding operation process can adopt corresponding operation implementation in the prior art.
Among the present invention, described VMSC information comprises MSC number and VLR number, is not limited to this certainly, can also comprise DPC (DPC) or IP address etc.
After finishing the operation of above-mentioned steps 26 and step 27, the master can also be to standby VMSC backup user contracting data with VMSC. and the purpose of doing like this is, when standby VMSC upgrades or because during certain unplanned reason collapse, the subscription data of possible loss full backup, if simple dependence HLR is synchronous, because the frequency of contracted user's data variation is lower with the VMSC capacity with respect to main, user signing contract information is less than the main VMSC that uses far away among the very possible long-term standby VMSC, at this moment can bring risk to system equally, at this moment, between the master is with VMSC and standby VMSC, keep an independent user subscription data backup procedure again, so just can avoid above-mentioned risk fully, this operation is a static state, dynamic data backup process is ignored in independently operating process.
The present invention also provides a kind of system that realizes mobile user data safety backup, and the specific implementation of this system specifically comprises following processing unit as shown in Figure 3:
(1) standby VMSC information sends processing unit
This unit is arranged at main with among the VMSC, be used for the time to the request message of HLR request user data, with corresponding standby VMSC information-bearing in described request message, and transmission.
(2) user data backup processing unit
Be arranged among the HLR, be used for communicating by letter with corresponding standby VMSC, and upgrade the relative users data of wherein preserving according to the information of the standby VMSC that leads the request message of sending with VMSC;
Described user data backup processing unit specifically comprises:
Standby VMSC information identificating unit is used for identifying the standby VMSC information that the main request message of sending with VMSC carries, and passes to the information comparing unit;
The information comparing unit, whether with the former standby VMSC information of HLR preservation consistent, and comparative result is passed to the user data update processing unit if being used for the relatively more main standby VMSC information of sending with VMSC;
The user data update processing unit is used for according to described comparative result the user data information of standby VMSC being upgraded operation, realizes main consistent with user data among VMSC and the standby VMSC.
Wherein, described user data update processing unit further comprises deletion action unit and retouching operation unit, and perhaps, deletion action unit and user contracting data transmitting element are respectively:
The deletion action unit, be used for when the former standby VMSC information inconsistency of standby VMSC information of determining to send and preservation, delete the relative users data among the former standby VMSC, perhaps, be used for when the main request message of sending with VMSC does not carry standby VMSC information, delete the relative users data among the former standby VMS, perhaps, be used for deleting the relative users data message of leading the standby VMSC that sends with VMSC;
User data among this standby VMSC if the relative users data message deletion among the standby VMSC that sends with VMSC will not led in the deletion action unit, is then revised by this unit in the retouching operation unit;
The user data transmitting element if the relative users data message of leading among the standby VMSC that sends with VMSC is deleted by the deletion action unit controls, then sends to standby VMSC by this unit with corresponding user data.
In sum, the method and system of realization mobile user data safety backup of the present invention with the synchronous points of HLR as user contracting data, have realized main consistency with user data between VMSC and the standby VMSC.With the VMSC failure, after standby VMSC took over the network entity and user of former master with VMSC control, standby VMSC had former main complete subscription data with VMSC user when main, and the business of the acceptance periphery network entity that standby VMSC can be level and smooth is switched.
And, because present embodiment has a HLR and judges the step of whether carrying standby VMSC information in the position updating request, when not carrying, HLR is invalid with original standby VMSC information, can effectively guarantee the consistency of system, because the present invention also has the process of a main VMSC of using to standby VMSC backup user contracting data, under the loss full backup data conditions, still can have the partial data of master again with VMSC when the unexpected collapse of standby VMSC.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.
Claims (12)
1. a method that realizes the mobile user contracted data safety backup is characterized in that, comprising:
A, main with the message of Visited Mobile Switching Center VMSC to location register HLR initiation acquisition request user contracting data, and in described message, carry standby VMSC information;
B, HLR realize main with the user contracting data consistency operation among VMSC and the standby VMSC after receiving the main message of sending with VMSC according to the standby VMSC information of carrying in the message.
2. the method for realization mobile user contracted data safety backup according to claim 1 is characterized in that the message of described acquisition request user contracting data comprises: location update request message.
3. the method for realization mobile user contracted data safety backup according to claim 1 is characterized in that, described step B comprises:
HLR judges to lead in the message of sending with VMSC whether comprise standby VMSC information, and after determining to comprise, by HLR needs are sent to main user contracting data information with VMSC, send to main VMSC of using and standby VMSC respectively, realize main consistent with the user contracting data among the standby VMSC with VMSC.
4. the method for realization mobile user contracted data safety backup according to claim 3 is characterized in that, described step B also comprises:
B1, in determining the main message of sending with VMSC, comprise standby VMSC message after, the standby VMSC information that standby VMSC information that HLR will receive and HLR have write down compares, and realizes leading being adjusted into consistent with VMSC with user contracting data among the standby VMSC according to comparative result.
5. the method for realization mobile user contracted data safety backup according to claim 4 is characterized in that, described step B1 comprises:
B11, different with the standby VMSC information of record if described comparative result is the standby VMSC information received, then HLR is the user contracting data among former standby VMSC deletion, and needs are sent to main user contracting data with VMSC sends to main with VMSC and the standby VMSC that receives simultaneously.
6. the method for realization mobile user contracted data safety backup according to claim 5, it is characterized in that, described step B11 also comprises: different if described comparative result is the standby VMSC information received with the standby VMSC information of record, then write down new standby VMSC information.
7. the method for realization mobile user contracted data safety backup according to claim 4 is characterized in that, described step B1 comprises:
B12, identical with the standby VMSC information of receiving as if the standby VMSC of record, then HLR is revised as the user contracting data among the former standby VMSC and need sends to main user contracting data with VMSC, perhaps, after HLR deletes the user contracting data among the former standby VMSC needs are sent to main user contracting data with VMSC and send to standby VMSC; And HLR also sends to needs main user contracting data with VMSC and sends to the main VMSC that uses.
8. according to the method for each described realization mobile user contracted data safety backup in the claim 1 to 7, it is characterized in that described method also comprises:
HLR deletes, revises the data among the standby VMSC based on the MAP MAP or upgrades operation.
9. according to the method for each described realization mobile user contracted data safety backup in the claim 1 to 7, it is characterized in that described VMSC information comprises:
Moving exchanging center MSC number, VLR Visitor Location Register VLR number, DPC DPC or IP address information.
10. a system that realizes the mobile user contracted data safety backup is characterized in that, comprising:
Standby VMSC information sends processing unit, is arranged at mainly with among the VMSC, be used for the time to the request message of HLR request user contracting data, with corresponding standby VMSC information-bearing in described request message, and transmission;
User contracting data back-up processing unit is arranged among the HLR, is used for communicating by letter with corresponding standby VMSC according to the information of the standby VMSC that leads the request message of sending with VMSC, and upgrades the relative users subscription data of wherein preserving.
11. the system of realization mobile user contracted data safety backup according to claim 10 is characterized in that, described user contracting data back-up processing unit comprises:
Standby VMSC information identificating unit is used for identifying the standby VMSC information that the main request message of sending with VMSC carries, and passes to the information comparing unit;
The information comparing unit is used for comparing with VMSC standby VMSC information of sending and the former standby VMSC information that HLR preserves main, and comparative result is passed to user contracting data renewal processing unit;
User contracting data upgrades processing unit, is used for according to described comparative result the user contracting data information of standby VMSC being upgraded operation, realizes main consistent with user contracting data among VMSC and the standby VMSC.
12. the system of realization mobile user contracted data safety backup according to claim 11, it is characterized in that described user contracting data upgrades processing unit and comprises: deletion action unit and retouching operation unit, perhaps, deletion action unit and user contracting data transmitting element, wherein:
The deletion action unit, be used for when the former standby VMSC information inconsistency of standby VMSC information of determining to send and preservation, delete the relative users subscription data among the former standby VMSC, perhaps, be used for when the main request message of sending with VMSC does not carry standby VMSC information, delete the relative users subscription data among the former standby VMSC, perhaps, be used for deleting the relative users subscription data information of leading the standby VMSC that sends with VMSC;
The retouching operation unit, if the relative users subscription data information deletion among the standby VMSC that sends with VMSC will not led in the deletion action unit, then the user contracting data among the standby VMSC will be revised in the retouching operation unit;
The user contracting data transmitting element if the relative users subscription data information of leading among the standby VMSC that sends with VMSC is deleted by the deletion action unit controls, then sends to standby VMSC by the user contracting data transmitting element with corresponding user contracting data.
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| US6408182B1 (en) * | 1999-07-16 | 2002-06-18 | Ericsson, Inc. | Redundant mobile switching center (MSC) architecture for a radio telecommunications network |
| CN1434574A (en) * | 2002-01-24 | 2003-08-06 | 华为技术有限公司 | Backup method for mobile exchange center |
| CN1545345A (en) * | 2003-11-12 | 2004-11-10 | 中兴通讯股份有限公司 | Method for disaster recovery of mobile soft switch network |
| CN1571538A (en) * | 2004-05-10 | 2005-01-26 | 中兴通讯股份有限公司 | A method for performing system load control on mobile switch center |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6408182B1 (en) * | 1999-07-16 | 2002-06-18 | Ericsson, Inc. | Redundant mobile switching center (MSC) architecture for a radio telecommunications network |
| CN1434574A (en) * | 2002-01-24 | 2003-08-06 | 华为技术有限公司 | Backup method for mobile exchange center |
| CN1545345A (en) * | 2003-11-12 | 2004-11-10 | 中兴通讯股份有限公司 | Method for disaster recovery of mobile soft switch network |
| CN1571538A (en) * | 2004-05-10 | 2005-01-26 | 中兴通讯股份有限公司 | A method for performing system load control on mobile switch center |
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