A Heuristic Data Diffusion and Gathering Scheme Using Virtual Line for Wireless Sensor Networks with Mobile Sink

In wireless sensor networks (WSNs), the nodes around the sink deplete their energy considerably earlier than the other network nodes because they forward all the data packets toward the sink. Hence, the active nodes of the network and the sink are disconnected and also the network is divided to sub-networks. Utilizing mobile sink is a solution for this problem; using a mobile sink can balance the load of network but the manner of data transmission toward the mobile sink to have desired QoS and optimize delivery ratio, energy conservation, overhead and delay, is a challenge. In this paper, In this paper, a heuristic algorithm for data diffusion and gathering based on virtual line is proposed in WSNs with mobile sink. In the proposed algorithm, a virtual line is considered in the middle of the network and the rest of the network Area is zoned. The virtual line is segmented to facilitate the search phase. Also, the sensed data in different areas of the network are received only in the corresponding part of the virtual line. In this method, by sending sink requests in batches, reducing the data search area in the virtual line, as well as aggregating and reducing the final data volume, the data transfer operation to the mobile sink is performed. The evaluations show the proposed scheme overcomes the recent related works presenting more efficient energy conservation, delay, overhead and delivery ratio.