Multiplex communications – Wide area network – Packet switching
Patent
1993-04-19
1995-01-24
Marcelo, Melvin
Multiplex communications
Wide area network
Packet switching
370 953, 3701101, H04J 326, H04L 522
Patent
active
053847776
ABSTRACT:
A Medium Access (MAC) Protocol is utilized for wireless radio access for a plurality of remote stations to a base station on a LAN. There is a time division fixed frame structure in which time is slotted, and time slots are grouped into fixed frames consisting of data and control subframes or periods. The fixed frame structure consists of three periods (A, B, and C) along with their respective headers. The first period, the A period, is used exclusively for data transfer from the base station to the remote stations. The following period, the B period, is used for contention-free data transfer from the remote stations to the base station. The allocation of the data slots in the A and B periods is performed by the base station. The last period of the frame, designated as the C period, is used for the transmission of reservation requests and data from the remote stations to the base station in a random-access contention mode using a slotted Aloha protocol. The duration of the three periods may be varied using a movable boundary technique.
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Ahmadi Hamid
Bantz David F.
Bauchot Frederic J.
Krishna Arvind
La Maire Richard O.
International Business Machines - Corporation
Marcelo Melvin
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