Recent convergence of information communications technology and computing is creating new demands and opportunities for ubiquitous computing via wireless and mobile equipments.The demanding networking environment of wireless communications and the fast-growing number of mobile users impose several challenges in terms of channel estimation,network protocol design,resource management,systematic design,application development,and security.The objective of this special issue is to gather recent advances addressing networks,systems,algorithms,and applications that support the symbiosis of mobile computers and wireless networks.