The rapid growing data traffic brings more and morepressure to the wireless networks, which is predict-ed to increase by over 10,000 times in the next 20 years. However, currently, there is still large number of popu-lation without coverage of mobile service. In addition to the issue of coverage, future wireless networks also need to guarantee the service continuity for emerging services such as Machine-to-Machine and Intet of Things. Many emerging scenarios, such as Unmanned Aerial Vehicle (UAV) control, pipeline monitoring, or global container tracking, require the aid of wireless networks. However, existing networks are severely hindering these services from achieving their true potentials. Considering the deficiency in existing wireless networks nowadays, ubiquitous on-demand coverage is the key to ensure ser-vice continuity in future communication paradigm.