Security mechanism adds authentication and encryption mechanisms to MAC frame to defense MAC layer security attacks.

安全机制通过增加MAC帧的认证和保密以防御MAC层的安全攻击。

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After introducing some different MAC protocols in this thesis, and analyzing energy factors of MAC layer, such as overhearing, idle listening, collision conflict and excessive information of control.

本文在对不同类型MAC协议进行了介绍，并分析了MAC层的能耗原因，如网络串音、空闲侦听、碰撞冲突及控制信息过多。

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The energy control mechanism is performed by the MAC layer and the routing layer, but the MAC layer is more direct and frequent in the energy control than the routing layer.

而传感器网络中能量的控制主要由MAC层和路由层完成，MAC层相对于路由层对能量的控制更为直接和频繁。

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