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    4.
    发明专利
    未知

    公开(公告)号：DE69533976D1

    公开(公告)日：2005-03-10

    申请号：DE69533976

    申请日：1995-11-16

    Applicant: IBM

    Inventor： CHIEU TRIEU CHAN ,  NARASIMHAN ANAND ,  O'NEIL GARY ERNEST ,  ZAI LI-CHENG R

    IPC: H04L5/14 ,  H04B7/26 ,  H04J3/00 ,  H04M1/725 ,  H04Q7/38 ,  H04Q7/30

    Abstract: Direct communication between a primary portable unit initiating the communication and a secondary portable unit is established utilizing two handshaking operations. The first handshaking operation is performed in the base station channel to establish initial contact between the primary and secondary portable units. After initial contact is made, the second handshaking operation is performed to establish communication in an unoccupied channel. The base station channel and the unoccupied channel may be a TDMA/TDD channel or a TDMA/FDD channel.

    5.
    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.

    HANDOFF MONITORING IN CELLULAR COMMUNICATION NETWORKS USING SLOW FREQUENCY HOPPING
    6.
    发明专利
    HANDOFF MONITORING IN CELLULAR COMMUNICATION NETWORKS USING SLOW FREQUENCY HOPPING 未知

    公开(公告)号：CA2145165C

    公开(公告)日：1999-03-02

    申请号：CA2145165

    申请日：1995-03-20

    Applicant: IBM

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

    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 are a 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 mor e of said mobile stations under control of a controller, with communication between base s tations and mobile stations being performed by frequency hopping, with there being n availab le frequency hopping channels in a fixed frequency band, with each channel being of a same fi xed 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 perform ance 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 transfe rring control of said mobile station to said another base station in response to the sensed trans mission.

    7.
    发明专利
    未知

    公开(公告)号：DE69533976T2

    公开(公告)日：2006-01-19

    申请号：DE69533976

    申请日：1995-11-16

    Applicant: IBM

    Inventor： CHIEU TRIEU CHAN ,  NARASIMHAN ANAND ,  O'NEIL GARY ERNEST ,  ZAI LI-CHENG R

    IPC: H04L5/14 ,  H04B7/26 ,  H04J3/00 ,  H04M1/725 ,  H04Q7/30 ,  H04Q7/38

    Abstract: Direct communication between a primary portable unit initiating the communication and a secondary portable unit is established utilizing two handshaking operations. The first handshaking operation is performed in the base station channel to establish initial contact between the primary and secondary portable units. After initial contact is made, the second handshaking operation is performed to establish communication in an unoccupied channel. The base station channel and the unoccupied channel may be a TDMA/TDD channel or a TDMA/FDD channel.

    8.
    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.

    Handoff Monitoring in Cellular Communication Networks Using Slow Frequency Hopping
    10.
    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.

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