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Solving capture in switched two-node Ethernets by changing only one node

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2 Author(s)
Hayes, W. ; Dept. of Comput. Sci., Toronto Univ., Ont., Canada ; Molle, M.L.

It is well known that the Ethernet medium access control protocol can cause significant short-term unfairness through a mechanism known as the capture effect, and that this unfairness condition is worst in heavily loaded Ethernets with a small number of active nodes. Recently, Ramakrishnan and Yang (1994) proposed capture avoidance binary exponential back-off (CABEB) to provide 1-packet-per-turn round robin service in the important special case of a 2-node collision domain. We introduce an equal time round-robin scheme, in which only one node needs to be modified. In our scheme, the modified node maintains a local copy of the attempts counter of the other node. It uses this information to trigger switching its medium access policy between the two extremes of aggressively persistent and completely passive. As a result, the modified node can control the actions of the other node in such a way that both enjoy fair, low delay, round-robin access to the shared channel

Published in:

Local Computer Networks, 1995., Proceedings. 20th Conference on

Date of Conference:

16-19 Oct 1995

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