Partha S Bhattacharya, Age 415620 Saint Louis Ave, Sarasota, FL 34233

5490139, Feb 6, 1996

Sep 28, 1994

8/314554

Murray C. Baker - Toronto, CA
Partha P. Bhattacharya - Briarcliff Manor NY
Jeane S.-C. Chen - Ossining NY
Roger Y. M. Cheung - Scarborough, CA
Arvind Krishna - Briarcliff Manor NY
Peter E. Reissner - Mississauga, CA
Mahmoud Naghshineh - Fishkill NY

International Business Machines Corporation - Armonk NY

H04B 726
H04L 1266

370 60

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.

5797000, Aug 18, 1998

Jun 20, 1996

8/667056

Partha Pratim Bhattacharya - Briarcliff Manor NY
Jen-Yao Chung - Yorktown Heights NY
Mir Hamid Pirahesh - San Jose CA
Patricia G. Selinger - San Jose CA
Marisa S. Viveros - Hartsdale NY
Yun Wang - Saratoga CA
Lawrence Peter Zaino - Poughkeepsie NY

International Business Machines Corporation - Armonk NY

G06F 1730

395602

A method of performing a parallel join operation on a pair of relations R1 and R2 in a system containing P processors organized into Q clusters of P/Q processors each. The system contains disk storage for each cluster, shared by the processors of that cluster, together with a shared intermediate memory (SIM) accessible by all processors. The relations R1 and R2 to be joined are first sorted on the join column. The underlying domain of the join column is then partitioned into P ranges of equal size. Each range is further divided into M subranges of progressively decreasing size to create MP tasks T. sub. m,p, the subranges of a given range being so sized relative to one another that the estimated completion time for task T. sub. m,p is a predetermined fraction that of task T. sub. m-1,p. Tasks T. sub. m,p with larger time estimates are assigned (and the corresponding tuples shipped) to the cluster to which processor p belongs, while tasks with smaller time estimates are assigned to the SIM, which is regarded as a universal cluster (cluster 0).

5570366, Oct 29, 1996

May 18, 1995

8/443793

Murray C. Baker - Toronto, CA
Roger Y. M. Cheung - Scarborough, CA
Partha P. Bhattacharya - Briarcliff NY
Roberto M. Kobo - Campinas, BR
Eduardo M. Kolbe - Campinas, BR
Mahmoud Naghshineh - Fishkill NY

International Business Machines Corporation - Armonk NY

H04J 302

370 8513

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.