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Abstract: long propagation delays, the low channel utilization rate and so on of underwater acoustic sensor networks was investigated, so the paper put forward a MAC protocol for multi - link transmission in underwater acoustic sensor network. In this protocol, nodes interacted the information of delays and transmission plans with each other by the RTS/CTS handshake protocol, so that multiple data links transmitted messages. For example, in the case of a sink node receiving other nodes’ data, this sink node arranged all sending nodes’ transmission sequences on basis of delays and data size, avoiding the energy loss and the low channel utilization rate caused by transmission conflicts. At the same time, to obtain the biggest network throughput, this paper also gives the theoretical expression of the optimal backoff window value. Simulation results show that this protocol could not only improve the network throughput of underwater acoustic sensor networks, but also reduce transmission conflicts, thus prolong the lifetime of nodes.

摘要: 本文对水声传感网络存在的高时延、低信道利用率等问题进行了研究,并提出了一种适用于水声传感网络的多链路 传输 MAC 协议。在该协议中,节点通过 RTS/CTS 握手协议交互时延信息和传输计划,并以此实现多条链路传输数据。例如, 在汇聚节点接收多个节点的数据时,汇聚节点根据与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,本文也给出最优退避窗口值的理论表达式。仿真表明,该 协议既能有效提高水声传感网络的吞吐量,也能降低传输冲突,从而延长水下节点的工作时间。