Multiplex communications – Wide area network – Packet switching
Patent
1995-05-18
1996-10-29
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 941, H04J 302
Patent
active
055703666
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.
REFERENCES:
patent: Re28811 (1976-05-01), Pierce
patent: 4049906 (1977-09-01), Hafner et al.
patent: 4081612 (1978-03-01), Hafner
patent: 5159592 (1992-10-01), Perkins
patent: 5276703 (1994-01-01), Budin et al.
patent: 5339316 (1994-08-01), Diepstraten
"Extendability Considerations in the Design of the Distributed Computer System (DCS)", Farber et al., pp. 15E-1 to 15E-6.
Baker Murray C.
Bhattacharya Partha P.
Cheung Roger Y. M.
Kobo Roberto M.
Kolbe Eduardo M.
Cockburn Joscelyn G.
International Business Machines - Corporation
Olms Douglas W.
Ton Dang
LandOfFree
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