无线传感器网络中采用预约机制的MAC协议改进

提出一种基于信道预约的MAC协议CR-MAC(channel-reservation MAC)，该协议是在S-MAC（sensor-MAC）协议基础上进行的改进。当有数据需要发送时，首先以基于竞争的方式发送和接收信道预约信息，实现信道的按需分配；信道预约完成后各节点按照预约好的时间片进行激活，以时分复用的方式传输数据。CR-MAC协议能够有效地减少节点的空闲侦听和串音干扰，从而降低能量消耗和传输延时。

Improved MAC protocol for wireless sensor networks by reservation

This paper proposed a channel reservation based MAC protocol. It was improved on S-MAC protocol. In the data transmission process, it sent and received the information of channel reservation through competition. Every node distributed channel according to need. Then activated each node according to the reserved time slot and transmitted the data by TDMA. The CR-MAC protocol can effectively decrease the idle listening and crosstalk interference of the nodes and reduce the energy consumption and transmission delay. It has some practical significance for development of wireless sensor networks.