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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.
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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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公开(公告)号:DE69330065T2
公开(公告)日:2001-08-09
申请号:DE69330065
申请日:1993-12-08
Applicant: IBM
Inventor: BJORKLUND RONALD EINAR , BAUCHOT FREDERIC , WETTERWALD MICHELE MARIE , KUTTEN SHAY , HERZBERG AMIR
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公开(公告)号:DE69329497D1
公开(公告)日:2000-11-02
申请号:DE69329497
申请日:1993-12-08
Applicant: IBM
Inventor: BANTZ DAVID , BAUCHOT FREDERIC , WETTERWALD MICHELE MARIE , NATARAJAN KATHADUR , AHMADI HAMID
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公开(公告)号:DE69329497T2
公开(公告)日:2001-05-10
申请号:DE69329497
申请日:1993-12-08
Applicant: IBM
Inventor: BANTZ DAVID , BAUCHOT FREDERIC , WETTERWALD MICHELE MARIE , NATARAJAN KATHADUR , AHMADI HAMID
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公开(公告)号:DE69330065D1
公开(公告)日:2001-05-03
申请号:DE69330065
申请日:1993-12-08
Applicant: IBM
Inventor: BJORKLUND RONALD EINAR , BAUCHOT FREDERIC , WETTERWALD MICHELE MARIE , KUTTEN SHAY , HERZBERG AMIR
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公开(公告)号:ES2151899T3
公开(公告)日:2001-01-16
申请号:ES93480220
申请日:1993-12-08
Applicant: IBM
Inventor: BANTZ DAVID , BAUCHOT FREDERIC , WETTERWALD MICHELE MARIE , NATARAJAN KATHADUR , AHMADI HAMID
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公开(公告)号:AT196705T
公开(公告)日:2000-10-15
申请号:AT93480220
申请日:1993-12-08
Applicant: IBM
Inventor: BANTZ DAVID , BAUCHOT FREDERIC , WETTERWALD MICHELE MARIE , NATARAJAN KATHADUR , AHMADI HAMID
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