Method and apparatus for cyclic reservation multiple access in a

Details Method and apparatus for cyclic reservation multiple access in a Method and apparatus for cyclic reservation multiple access in a

1990-03-12

1993-02-09

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 8515, H04J 316

Patent

active

051857375

ABSTRACT:
In a communications network comprising two counterflowing busses (folded bus or dual bus) and a number of stations (N1, N2, N3) connected between them, a cyclic reservation and access technique is provided. A headend unit generates consecutive time slots for data transmission which are grouped in cycles. For each cycle, the headend first issues a reservation command (RES) with a cycle number and a reservation count which each station augments by the slot count required locally. Each station stores the cycle number with the requested slot count. The headend stores in a global reservation queue, for each returning reservation command, the cycle number and the accumulated reservation count. Later it issues a start command (ST) with the respective cycle number, and subsequently generates the required number of slots as indicated by the stored accumulated reservation count. The headend can issue additional confirm commands and reject commands for activating a backpressure mechanism.

REFERENCES:
patent: 4536873 (1985-08-01), Leete
patent: 4718061 (1988-01-01), Turner
patent: 47671780 (1988-08-01), Bingham et al.
John L. Hullett and Peter Evans, "New Proposal extends the reach of metro area nets", Data Communications, vol. 17, No. 2, Feb. 1988, pp. 139-147.

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