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公开(公告)号：CA2137587C
公开(公告)日：1999-03-23
申请号：CA2137587
申请日：1994-12-08
Applicant: IBM CANADA , IBM
Inventor： KOLBE EDUARDO MORENO , KOBO ROBERTO MITSOU , BAKER MURRAY CHARLES , BHATTACHARYA PARTHA PRATIM , CHEUNG ROGER YIU MING , NAGHSHINEH MAHMOUD
Abstract: In communication systems which include high speed wired local area networks (LAN s) and low speed wireless LANs, the bandwidth of the wireless LANs can be severely impa cted. 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 m essages are not required to act on them. The present invention provides a means and meth od to filter out unneeded messages so that they do not impact the bandwidth of the wir eless 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 an d 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 us ed for filtering messages. The tables at each access point are maintained current by mo ving 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 predet ermined interval of inactivity is encountered and a terminal is determined to be no long er in active contact with the access point.
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2.发明专利
公开(公告)号：HUT75483A
公开(公告)日：1997-05-28
申请号：HU9602714
申请日：1995-09-08
Applicant: IBM
Inventor： BAKER MURRAY CHARLES , BHATTACHARYA PARTHA PRATIM , CHEN JEANE SHU-CHUN , CHEUNG ROGER YIU MING , KRISHNA ARVIND , NAGHSHINEH MAHMOUD , REISSNER PETER ERIC
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.
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公开(公告)号：PL316671A1
公开(公告)日：1997-02-03
申请号：PL31667195
申请日：1995-09-08
Applicant: IBM
Inventor： BAKER MURRAY CHARLES , BHATTACHARYA PARTHA PRATIM , CHEN JEANE SHU-CHUN , CHEUNG ROGER YIU MING , KRISHNA ARVIND , REISSNER PETER ERIC , NAGHSHINEH MAHMOUD
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.
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