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    5.
    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.

    7.
    发明专利
    未知

    公开(公告)号：DE69228156D1

    公开(公告)日：1999-02-25

    申请号：DE69228156

    申请日：1992-07-11

    Applicant: IBM

    Inventor： NATARAJAN KADATHUR SUBRAMANYA ,  HUANG CHIA-CHI

    IPC: H04L5/22 ,  G06F1/32 ,  H04L12/28 ,  H04L12/56

    Abstract: A method and apparatus for conserving battery power in a wireless link adapter of a battery operated computer such as a portable laptop computer, as controlled by a scheduled multiaccess protocol. The portable computer is operable as a mobile unit in a multi-cell wireless network. The scheduled access multiaccess protocol is implemented to effectively conserve battery power by suitable control of the state of the controller, the transmitter and receiver units at the wireless link adapter by scheduling when the adapter is in a normal running mode, or a standby mode in which power is conserved.

    Handoff Monitoring in Cellular Communication Networks Using Slow Frequency Hopping
    8.
    发明专利
    Handoff Monitoring in Cellular Communication Networks Using Slow Frequency Hopping 未知

    公开(公告)号：CA2145165A1

    公开(公告)日：1995-10-13

    申请号：CA2145165

    申请日：1995-03-20

    Applicant: IBM

    Inventor： HUANG CHIA-CHI ,  BANTZ DAVID F ,  BAUCHOT FREDERIC J ,  NATARAJAN KADATHUR S ,  NARASIMHAN ANAND ,  WETTERWALD MICHELE M

    IPC: G06F13/00 ,  H04L12/28 ,  H04W24/00 ,  H04W36/08 ,  H04W36/30 ,  H04W84/12 ,  H04Q7/38

    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.

    9.
    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.

    10.
    发明专利
    未知

    公开(公告)号：DE69431219D1

    公开(公告)日：2002-10-02

    申请号：DE69431219

    申请日：1994-04-15

    Applicant: IBM

    Inventor： BANTZ DAVID F ,  BAUCHOT FREDERIC J ,  HUANG CHIA-CHI ,  MOULTON NICHOLAS J A

    IPC: H04B7/08 ,  H04L1/02

    Abstract: In a mobile cellular communication system, a base station is wired to a Local Area Network (LAN), and has wireless communication with a plurality of mobile stations. Multipath fading is substantially reduced in the system by utilizing antenna diversity techniques at the base station and each of the plurality of mobile stations. The combination of the independent operation of antenna selection diversity at both a base station and a mobile station results in the selection of the best propagation path between the two stations.

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