公开(公告)号：DE69431219T2

公开(公告)日：2003-04-30

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.

公开(公告)号：AT223123T

公开(公告)日：2002-09-15

申请号：AT94105877

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.

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.

公开(公告)号：CA2132765A1

公开(公告)日：1995-04-23

申请号：CA2132765

申请日：1994-09-23

Applicant: IBM

Inventor： BAUCHOT FREDERIC J ,  HUANG CHIA-CHI ,  KESSLER ILAN ,  NATARAJAN KADATHUR S

IPC: H04B1/7156 ,  H04J13/00 ,  H04L7/04 ,  H04Q7/38 ,  H04B7/12 ,  H04B1/713 ,  H04Q7/22