“…Although, these placement algorithms focus on connectivity, coverage, energy consumption, congestion control, storage capacity and other issues in WSNs, there is still one or more shortcomings in these algorithms, such as: poor application background, too strong assumption, poor scalability, higher degree of complexity on computing and communications and so on. In response to this situation, Gong [11] has conducted a wide range of investigation on placement problem in WSNs. Based on the weaknesses of wireless sensor networks, which are of poor transmission reliability, limited energy, limited storage and computing ability, the lack of placement algorithms for mobile sensor networks, he designed a set of placement algorithms for wireless sensor networks.…”