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Wireless local area network system with mobile station handover

  • US 5,371,738 A
  • Filed: 05/28/1993
  • Issued: 12/06/1994
  • Est. Priority Date: 12/22/1992
  • Status: Expired due to Term
First Claim
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1. A local area network system comprising:

  • a backbone LAN (12);

    a plurality of addressable base stations (22,

         52) for respective wireless cells (34,

         58), each base station (22) having a first interface adapted to communicate with said backbone LAN (12) and a second interface adapted to communicate with a mobile wireless station (30);

    each said base station (22) being adapted to operate as a transparent bridge having a dynamic filtering database for restricting communications between said backbone LAN (12) and said mobile wireless station (30);

    each said base station (22) operating in response to a handover decision at said mobile wireless station (30) to hand over communications from a first cell (34) associated with a first base station (22) to a second cell (58) associated with a second base station (52), said mobile wireless station (30) being adapted to transmit via said second base station (52) and backbone LAN (12), a handover request message (172) having the address of said mobile wireless station (30) as a source address and the address of said first base station (22) as a destination address, thereby updating the dynamic filtering databases of said first and second base stations (22,

         52) as to the location of said mobile wireless station (30); and

    at least one transparent bridge (26,

         44) having a dynamic filtering database for restricting communications between said base stations (22,

         52);

    each said transparent bridge being adapted to be updated by said handover request message (172).

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