说明：  文研究了无线传感器网络中增加协作传输及其能量效率，解决了“何时协作”和“协作的能效”两个关键问题。 无线传感器网络；增加协作传输：直接传输；能量效率
(The scheme of incremental cooperation transmission and its energy efficiency in wireless sensor networks arestudied in this paper． Wireless Sensor Networks(WSN)；Incremental cooperation transmission；Direct transmission；Energy efficiency)