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中文摘要：
针对无线传感器网络中存在数据冲突和串音而影响MAC协议能量效率的问题，提出了基于接收和基于发送的TDMA-MAC协议时隙分配策略。通过考虑各种无线收发器模式（即发送、接收、休眠和空闲）花费的不同时间段来计算WSN能耗，假设聚类中WN数据包时间间隔为指数分布，采用两级TDMA方法实现对多步聚类的评估。利用OPNETModeler软件执行仿真实验验证了该模型的有效性，仿真结果表明，基于接收的SAS能效是基于发送的SAS的五倍，相比基于分簇的TDMA／CDMA混合HCT-MAC协议，该协议可节省4．3％的能量，减少了0．35ms的端到端延迟，相比倍增超周期多信道MAC协议，可节省10．8％的能量，减少了1ms的端到端延迟。
英文摘要：
For the issue that data conflict and overhearing existing in wireless sensor network will impact energy efficiency of the MAC protocol, this paper proposed a transmit-based and receive-based slot allocation strategy of TDMA-MAC. It calculated the energy consumption of WSN by considering different times of cost of wireless transceiver pattern （ sending, receiving, dor- mancy and leisure）. Suppose WN packet interval in clustering was exponential distribution, two-stage TDMA method was used to implement the evaluation of multi-step clustering. It verified the effectiveness of proposed model by simulation done by OP- NET Modeler. Simulation results show that the energy efficiency of receive-based SAS is five times as well as transmit-based. Proposed protocol saves 4.3% energy and reduces 0. 35 ms delay comparing with hybrid TDMA/CDMA protocol based on clustering. It saves 10.8% energy and reduces 1 ms delay comparing with hybrid TDMA/CDMA protocol based on clustering.
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