一种基于多信道的接收节点优先的MAC算法

为了提高无线传感器网络的吞吐量并减小延迟,提出了一种基于多信道的接收节点优先的MAC算法（MCS-MAC）.在信道选择阶段,以接收节点为中心,由接收节点选择数据信道,发送节点转换到数据信道上与接收节点通信.如果接收节点不在控制信道上,邻居节点会主动发送NCTS包通知发送节点,并告知接收节点所在的信道,发送节点转换到数据信道进行通信,有效地利用了多信道,提高了网络吞吐量.在数据传输阶段,允许一次传送多个数据包,有效地减少了信道转换次数,减少了传输延迟.仿真结果表明,在较高负载的网络环境下,与经典S-MAC、MMAC协议相比,MCS-MAC明显提高网络吞吐量,同时减少了包的平均传输延迟.

An Receiver-priority MAC Protocol for WSN Based on Multi-channel

The communication aspect is focused on to present a protocol for WSN to improve network throughput and reduce average transmit-delay.In the channel choosing period,as the center,the receiver chooses an idle data channel,then the sender switches to this selected channel to communicate with receiver.If the receiver is not on the control channel,the neighbor of receiver will inform the sender which channel the receiver is on through sending an NCTS packet to the sender.And then,the sender switches to the channel.In this way,it can use the multi-channel effectively,improve the network throughput.In the data transmit period,it allowed to transmit multiple data packets at a time,reduce the times of channel switching and transmit delay effectively.In the network environment where the network load is highly,the results show that it improves the throughput and transmit delay performance of network obviously.