Random medium access methods with backoff adaptation to traffic

Details Random medium access methods with backoff adaptation to traffic Random medium access methods with backoff adaptation to traffic

2007-09-24

2010-02-16

Patel, Ajit (Department: 2617)

Multiplex communications

Channel assignment techniques

Carrier sense multiple access

C370S338000, C370S349000

Reexamination Certificate

active

07664132

ABSTRACT:
Using low PF values in conjunction with traffic-adapted contention windows leads to substantial decreases in delay and jitter. In general, adaptation to traffic reduces contention or delay: opening up the contention window in congestion and closing it on relief. Residual backoff adaptation provides for the reduction of the already decremented backoff values of stations that interrupted the backoff countdown process due to a transmission. It is good to adapt both the contention window and the residual backoff in order to avoid jitter. Otherwise, if the contention window is reduced but residual backoffs stay unchanged, new arrivals will enjoy shorter backoff delays than older ones, resulting in greater jitter. Adjusting both preserves the relative ordering of backoff counter values, which implies also some form of age ordering. Different adjustments can be applied to different priority traffic.

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