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：CA2129199A1

公开(公告)日：1996-01-30

申请号：CA2129199

申请日：1994-07-29

Applicant: IBM CANADA

Inventor： CHEUNG ROGER Y M ,  REISSNER PETER E

IPC: H04L12/28 ,  H04W92/02 ,  H04L12/46

公开(公告)号：CA2129197A1

公开(公告)日：1996-01-30

申请号：CA2129197

申请日：1994-07-29

Applicant: IBM CANADA

Inventor： CHEUNG ROGER Y M ,  REISSNER PETER E ,  MCKAY DANNY N

IPC: H04B7/26 ,  H04L12/28

Abstract: An internetworking node for providing internetworking services for mobile wireless nodes. Each mobile wireless node is associated with at the most one internetworking node. Each mobile wireless node selects which internetworking node it will associate with. The internetworking node will then act for all wireless nodes associated to it in relaying messages between wireless nodes or between a wired Local Area Network (LAN) and the wireless nodes.

公开(公告)号：CA2129200A1

公开(公告)日：1996-01-30

申请号：CA2129200

申请日：1994-07-29

Applicant: IBM CANADA

Inventor： BAKER MURRAY C ,  CHEUNG ROGER Y M ,  PERKINS CHARLES E ,  REISSNER PETER E

IPC: H04L12/28 ,  H04L12/46

Abstract: An internetworking node for providing internetworking services for mobile wireless nodes is disclosed. Each mobile wireless node is associated with at the most one internetworking node. Each mobile wireless node selects which internetworking node it will associate with. The internetworking node will then act for all wireless nodes associated to it in relaying messages between wireless nodes or between a wired lane and the wireless nodes. A tracking mechanism for such a system which maintains a table of all the internetworking nodes the wireless node has recently heard and deleting all such internetworking nodes which have not been heard recently is disclosed. A switching mechanism for such a system for determining when the wireless mobile node should switch its association from one internetworking node to another is also disclosed. The switching mechanism determines whether a particular internetworking node overheard by the mobile wireless node has been heard recently, and if not will associate with such an internetworking node. Otherwise the wireless node maintains its current association, with a particular internetworking node until a failure to communicate occurs or the said tracking mechanism deletes its reference to the said internetworking node.