公开(公告)号：CA2137587A1

公开(公告)日：1996-06-09

申请号：CA2137587

申请日：1994-12-08

Applicant: IBM CANADA ,  IBM

Inventor： BAKER MURRAY C ,  BHATTACHARYA PARTHA P ,  CHEUNG ROGER Y M ,  KOBO ROBERTO M ,  KOLBE EDUARDO M ,  NAGHSHINEH MAHMOUD

IPC: H04L12/46 ,  H04W4/06 ,  H04W88/10

Abstract: In communication systems which include high speed wired local area networks (LANs) and low speed wireless LANs, the bandwidth of the wireless LANs can be severely impacted. It has been found that many broadcast or multicast messages which are forwarded to the wireless LANs are not required as the mobile terminals which would receive the messages are not required to act on them. The present invention provides a means and method to filter out unneeded messages so that they do not impact the bandwidth of the wireless network. Each access point for each wireless LAN maintains a table of parameters for each associated mobile terminal in the connected wireless LAN. The parameters in that table are compared to the parameters in message frames received by the access point and only those messages having parameters found in the table are put on the wireless LAN. The level of filtering can be controlled by specifying which parameters are to be used for filtering messages. The tables at each access point are maintained current by moving table entries from access point to access point as mobile terminals move from wireless LAN to wireless LAN and by removing inactive table entries from the table when a predetermined interval of inactivity is encountered and a terminal is determined to be no longer in active contact with the access point.

公开(公告)号：PL178086B1

公开(公告)日：2000-02-29

申请号：PL31667195

申请日：1995-09-08

Applicant: IBM

Inventor： BAKER MURRAY C ,  BHATTACHARYA PARTHA P ,  CHEN JEANE S C ,  CHEUNG ROGER Y M ,  KRISHNA ARVIND ,  REISSNER PETER E ,  NAGHSHINEH MAHMOUD

IPC: H04L12/28 ,  H04L12/56 ,  H04W40/24 ,  H04W40/28 ,  H04W40/36 ,  H04W92/02 ,  H04Q11/04

Abstract: A method of routing packets through a fixed source routing communications network from and to mobile units. With this invention an initial access point is determined when a communications session is established to or from a mobile unit through the network. Location information is updated each time the mobile unit moves out of the range of one access point and into the range of another access point of the network. When packets for the session are to be transmitted to the mobile unit from the wired network, the packets are forwarded from the initial access point to a current access point, which by definition is in the range of the mobile unit. When packets for the session are to be transmitted from the mobile unit and to the wired network, the access point intercepts these packets and routes them to their destination and/or initiates route discovery to those destinations. When packets are to be transmitted between mobiles at different access points. The packets are sent between the current access points and not through the home access points.