Geometric Approximations of Some Aloha-like Stability Regions

Details Geometric Approximations of Some Aloha-like Stability Regions Geometric Approximations of Some Aloha-like Stability Regions

2010-06-29

arxiv.org/abs/1006.5686v1

Computer Science

Information Theory

Presented at IEEE ISIT 2010 (Austin, TX)

Scientific paper

Most bounds on the stability region of Aloha give necessary and sufficient conditions for the stability of an arrival rate vector under a specific contention probability (control) vector. But such results do not yield easy-to-check bounds on the overall Aloha stability region because they potentially require checking membership in an uncountably infinite number of sets parameterized by each possible control vector. In this paper we consider an important specific inner bound on Aloha that has this property of difficulty to check membership in the set. We provide ellipsoids (for which membership is easy-to-check) that we conjecture are inner and outer bounds on this set. We also study the set of controls that stabilize a fixed arrival rate vector; this set is shown to be a convex set.

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