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To support the sustainable operation of wireless sensor networks using limited energy, duty cycling is a promising solution. However, it is a challenge to guarantee each node communicating with its neighbors under duty cycle when the network is asynchronous. The challenge becomes bigger when nodes' duty cycles are required to be adjusted separately according to their demands to save energy and achieve high channel utilization. Existing low power listening-and contention-based protocols are notdoi:10.1093/comjnl/bxu077 fatcat:mxd374czrndrpabllvpty3q3ae