Extremely dense wireless networks [Guest Editorial]

The ever growing demand from mobile network users is pushing the current wireless technologies toward their limits. As a matter of fact, not even the most optimistic promises from emerging standards, such as LTEAdvanced and IEEE 802.11ac/ad/af, will be able to satiate the huge appetite for bandwidth of the future users of 5G networks ??? at least, unless the size of cells is reduced dramatically. This situation will soon create a desperate need for extremely dense wireless networks (DenseNets).