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Backward update strategy for location management

  • US 7,171,219 B2
  • Filed: 11/15/2004
  • Issued: 01/30/2007
  • Est. Priority Date: 05/21/2004
  • Status: Expired due to Fees
First Claim
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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.

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