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    1.
    发明专利
    未知

    公开(公告)号：DE69531076T2

    公开(公告)日：2004-05-06

    申请号：DE69531076

    申请日：1995-04-03

    Applicant: IBM

    Inventor： HUANG CHIA-CHI ,  BANTZ DAVID FREDERICK ,  BAUCHOT FREDERIC ,  NATARAJAN KADATHUR SUBRAMANYA ,  NARASIMHAN ANAND ,  WETTERWALD MICHELE MARIE

    IPC: G06F13/00 ,  H04L12/28 ,  H04W24/00 ,  H04W36/08 ,  H04W36/30 ,  H04W84/12 ,  H04Q7/38 ,  H04B7/26 ,  H04B1/713 ,  H04L1/20

    Abstract: Methods for handoff in a wireless communication network comprised of a local area network connected to a plurality of base stations, each of which has a geographic area, defined as a cell, within which mobile stations can communicate with a base station, with each such base station being capable of performing bidirectional wireless communication with one or more of said mobile stations under control of a controller, with communication between base stations and mobile stations being performed by frequency hopping, with there being n available frequency hopping channels in a fixed frequency band, with each channel being of a same fixed duration and having a fixed frequency different than another channel. The handoff method employs structure and techniques for determining by a mobile station that the quality of transmission between it and a current base station has degraded below a predetermined performance level, structure and technique for said mobile station to listen to each of successive frequency channels for a duration substantially less than said fixed duration of a channel until it senses a transmission from another base station, and structure and techniques for transferring control of said mobile station to said another base station in response to the sensed transmission.

    2.
    发明专利
    未知

    公开(公告)号：DE69531076D1

    公开(公告)日：2003-07-24

    申请号：DE69531076

    申请日：1995-04-03

    Applicant: IBM

    Inventor： HUANG CHIA-CHI ,  BANTZ DAVID FREDERICK ,  BAUCHOT FREDERIC ,  NATARAJAN KADATHUR SUBRAMANYA ,  NARASIMHAN ANAND ,  WETTERWALD MICHELE MARIE

    IPC: G06F13/00 ,  H04L12/28 ,  H04W24/00 ,  H04W36/08 ,  H04W36/30 ,  H04W84/12 ,  H04Q7/38 ,  H04B7/26 ,  H04B1/713 ,  H04L1/20

    Abstract: Methods for handoff in a wireless communication network comprised of a local area network connected to a plurality of base stations, each of which has a geographic area, defined as a cell, within which mobile stations can communicate with a base station, with each such base station being capable of performing bidirectional wireless communication with one or more of said mobile stations under control of a controller, with communication between base stations and mobile stations being performed by frequency hopping, with there being n available frequency hopping channels in a fixed frequency band, with each channel being of a same fixed duration and having a fixed frequency different than another channel. The handoff method employs structure and techniques for determining by a mobile station that the quality of transmission between it and a current base station has degraded below a predetermined performance level, structure and technique for said mobile station to listen to each of successive frequency channels for a duration substantially less than said fixed duration of a channel until it senses a transmission from another base station, and structure and techniques for transferring control of said mobile station to said another base station in response to the sensed transmission.

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