The Research And Realization Of VLR Backup Technology Based On MSC Pool

MSC Pool is a new networking technology. Not only can it improve the security andoptimization of core network, but also recover MSC service rapidly when the equipment andnetwork break down. MSC Pool plays an important role in the construction and maintenance of corenetwork. With the help of MSC Pool, network robustness and customer satisfaction would beimproved. What’s more, the investment and operation cost would be reduced at the same time.Normally, if one MSC Server of the MSC Pool fails, the terminating calls registered in thisMSC will failed. And the subscirbers can receive terminating calls only after having initiated alocation update or originating a call, which leads to re-registration in another MSC Server of thePool. At last, the terminating calls will complete after the other MSC do a global paging. But muchradio resource will be consumed.In this thesis, it puts forward the VLR backup technology based on MSC Pool which cansupport paging optimization. The MSC/VLR of MSC Pool should be used to backup the locationinformation which includes IMSI, LAI and Timestamp, and make subscribers’ location informationbe backed up in other MSC/VLR of the Pool.The methods of VLR backup implementation include enabling VLR backup, backing up,retrieving, removing, refreshing, resetting and audit the location information. VLR backup willinitiate the paging based on the location information previously stored in backup MSC. So, theoverall paging can be avoided. In one word, the techonology saves costs and avoids the networkcongestion.