Dynamic sensing point CSMA packet switching controller

Details Dynamic sensing point CSMA packet switching controller Dynamic sensing point CSMA packet switching controller

1988-10-28

1990-12-18

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 853, 370 941, H04J 316

Patent

active

049791680

ABSTRACT:
A controlled CSMA packet switching system of a non-persistent carrier type in which in the event of a channel being sensed busy, a new sensing point is scheduled at random in a dynamically determined time interval TS.sub.n where ##EQU1## where TS.sub.u is the scheduling time interval that maximizes the expected throughput when all the stations compete for the channel access, TS.sub.1 is the scheduling time interval that maximizes the expected throughput when two stations complete for the channel access, TS.sub.n-1 is a scheduling time interval determined in a preceding (n-1)th observation interval, G.sub.n-1 is the average offered load in the (n-1)th observation interval, and G.sub.o is a nominal average offered load. An estimation of the average offered load G.sub.n-1 is derived from an estimation of the average idle period length in the (n-1) observation interval. Three strategies for obtaining such an estimation when a station participates to at least one transmission in the observation interval are disclosed.

REFERENCES:
patent: 4581734 (1986-04-01), Olson et al.
patent: 4630264 (1986-12-01), Wah et al.
patent: 4701909 (1987-10-01), Kavehrad et al.
patent: 4707832 (1987-11-01), Glenn et al.
M. S. Hazell et al., "A Fully Distributed Approach to the Design . . . ", IEEE Milcom '83, pp. 645-649.
L. Kleinrock, "Packet Switching in Radio Channels: Part I . . . ", IEEE Trans. on Comm., vol. COM-23, No. 12, 1975.

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