Abstract: In RF harvesting wireless sensor network,adoptding multi-hop to send data to the Sink can reduce the communication distance between nodes and then reduce energy consumption,but increases sending and receiving data of relay nodes.In order to reduce the network load of relay nodes and prolong the network lifetime,a layer-step data collection (LSDC) approach was proposed.By modeling the process of energy harvesting and energy consumption,this paper got the residual energy of nodes.Through the use of multiple “hop” command,this paper notified sensor nodes to transfer the collected data to the Sink step-by-step in the network.This paper chose the node which has best energy status as relay node,and ultimately all the data in the network were collected and processed by Sink efficiently.Theory analysis and emulation test show that our algorithm obtains more energy efficiently, prolongs the network lifetime,and energy consumption is more balanced than layer-by-layer data collection (LDC) approach.

Key words: Wireless sensor network,Energy harvesting,Data collection,Lifetime