Convexity Conditions for 802.11 WLANs
  In this paper we characterise the maximal convex subsets of the (non-convex) rate region in 802.11 WLANs. In addition to being of intrinsic interest as a fundamental property of 802.11 WLANs, this characterisation can be exploited to allow the wealth of convex optimisation approaches to be applied to 802.11 WLANs. 
Vijay G. Subramanian, Douglas J. Leith
cs.NI cs.IT math.IT