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System and method for maintaining control channel mode information in a cellular telecommunications network

  • US 5,797,096 A
  • Filed: 08/02/1995
  • Issued: 08/18/1998
  • Est. Priority Date: 08/02/1995
  • Status: Expired due to Term
First Claim
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1. A method of maintaining control channel mode (CCM) status information for a mobile station in a cellular telecommunications network having a mobile switching center (MSC) and a home location register (HLR), said method comprising the steps of:

  • storing said CCM status information in said MSC, whenever said MS registers and whenever said MS changes control channel modes;

    storing said CCM status information in said HLR, whenever said MS changes control channel modes;

    determining whether said CCM status information has been lost by said MSC;

    receiving an incoming call for said mobile station;

    determining whether said incoming call is received after said CCM status information has been lost by said MSC; and

    retrieving said CCM status information from said HLR upon determining that said incoming call is received after said CCM status information is lost by said MSC and before said CCM status information is restored to said MSC by a registration message from said mobile station.

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