Patent ID: 7171219
Filing Date: 2007-01-30
Classification: H04W

Abstract:
1. A backward location update method for location management in a personal communication service (PCS) network, comprising: detecting movement of a mobile station (MS) in the PCS network from a first location area (LA) to a second LA; determining a location update type of the MS according to an update message received by a first visitor location register (VLR), wherein the location update type comprises an inter-LA or inter-MSC movement denoting the first and second LAs are connected to the same mobile switch center (MSC) or different MSCs respectively; updating a record stored in the first VLR corresponding to the MS, wherein the record is updated according to addresses of the second LA and a current MSC and a flag in the record is set if the location update type is an inter-MSC movement; and preventing instantaneous notification to a home location register (HLR) of the change of the record until a mobile station roaming number (MSRN) interrogation corresponding to the MS is received by the first VLR or when a record stored in the HLR is expired.