适用于水声传感网络的多链路传输MAC协议

Multi-Link Transmission MAC Protocol Suitable for Underwater Acoustic Sensor Network

针对水声传感网络存在的高时延、低信道利用率等问题,提出一种新的多链路传输介质访问控制协议。该协议节点通过RTS/CTS握手协议交互时延信息和传输计划,实现多条链路传输数据。在汇聚节点接收多个节点的数据时,汇聚节点根据节点的时延和接收的数据帧大小规划节点之间的发送顺序,避免传输冲突造成的能量损失和低信道利用率,同时为得到最大网络吞吐量,给出最优退避窗口值的理论表达式。仿真结果表明,与RC-FAMA、S-FAMA等协议相比,该协议能有效提高水声传感网络的吞吐量,降低传输冲突,从而延长水下节点的工作时间。

To address the problems of high latency and low channel utilization in underwater acoustic sensor networks,this paper proposes a new multi-link transmission Medium Access Control(MAC) protocol. In this protocol,nodes exchange the delay information and transmission plans through the RTS/CTS handshake protocol to implement multilink data transmission.When the sink node receives data from multiple nodes,the sink node plans the sending order of nodes according to the delay between nodes and the size of the received data frames,avoiding the energy loss and the low channel utilization rate caused by transmission conflicts.At the same time,in order to obtain the maximum network throughput,the theoretical expression of the optimal backoff window value is given. Simulation results show that compared with the RC-FAMA,S-FAMA protocols,this protocol can improve the throughput of underwater acoustic sensor networks and reduce transmission conflicts,thus prolonging the lifetime of underwater nodes.