公开(公告)号：CA2137484A1

公开(公告)日：1995-06-09

申请号：CA2137484

申请日：1994-12-07

Applicant: IBM

Inventor： AHMADI HAMID ,  BANTZ DAVID ,  BAUCHOT FREDERIC ,  NATARAJAN KADATHUR ,  WETTERWALD MICHELE M

IPC: H04L12/28 ,  H04W8/02 ,  H04W8/26 ,  H04B7/26

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.

公开(公告)号：CA2130396A1

公开(公告)日：1995-06-09

申请号：CA2130396

申请日：1994-08-18

Applicant: IBM

Inventor： BJORKLUND RONALD E ,  BAUCHOT FREDERIC ,  HERZBERG AMIR ,  KUTTEN SHAY ,  WETTERWALD MICHELE M

IPC: G09C1/00 ,  H04L9/08 ,  H04L9/32 ,  H04L12/22

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：CA2130396C

公开(公告)日：1998-03-31

申请号：CA2130396

申请日：1994-08-18

Applicant: IBM

Inventor： BJORKLUND RONALD E ,  BAUCHOT FREDERIC ,  WETTERWALD MICHELE M ,  HERZBERG AMIR ,  KUTTEN SHAY

IPC: G09C1/00 ,  H04L9/08 ,  H04L9/32 ,  H04L12/22

Abstract: This invention deals with a safe key distribution and authentication in a data communication network (e.g. wireless LAN type of network). The network includes a network manager to which are connected, via a LAN wired circuit, one or more base stations. Individual remote stations are, in turn, wirelessly connected to an installed base station. One essential function for achieving security in such a network, is a mechanism to reliably authenticate the exchanges of data between communicating parties. This involves the establishment of session keys, which keys need to be distributed safely to the network components. An original and safe method is provided with this invention for key distribution and authentication during network installation, said method including using the first installed base station for generating a network key and a backbone key, and then using said first installed base station for subsequent remote station or additional base station installations while avoiding communicating said network key.