Date Added: Dec 2012
Popularity of wireless access technologies manifests itself in the form of ever increasing penetration of wireless local area networks. For example, it is estimated that household penetration of Wi-Fi networks is 61% in the USA, 73% in the UK, and 80% in South Korea as of 2011. This trend has a number of profound implications, particularly for densely populated urban areas. As more Wi-Fi networks that is in close physical proximity share a common spectrum, the amount of spectrum per network drops due to interference. This effect cannot be controlled in unlicensed bands, but its extent may be bounded by estimating the maximum number of neighboring networks that is possible in view of the limited Wi-Fi transmission range.