海上自组网中基于侦听的MAC协议退避算法
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哈尔滨工程大学

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国家自然科学基金(62071139)


MAC Protocol Backoff Algorithm based on Interception in Maritime Ad Hoc Networks
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Harbin Engineering University

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National Natural Science Foundation of China (62071139)

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    摘要:

    因任务需求,无人艇通常以编队协同的方式进行作业,并通过自组网进行数据交换。因海浪等因素影响,海上自组网的信道传输损耗通常处于动态变化的状态,现有MAC协议的退避算法在动态海上环境下无法区分分组碰撞和分组丢失,会出现可靠性和稳定性下降的问题。为此,本文提出了一种基于信道监听的自适应最小竞争窗口退避算法,该算法通过感知邻近竞争节点数目来估计信道状态,降低信道冲突概率和重传次数,提升了网络整体的可靠性和稳定性。仿真结果表明,与经典BEB算法相比,改进算法的吞吐量和公平性分别最大提高了28.67%和62.00%,端到端延时和丢包率分别最大降低了2.84%和15.10%。

    Abstract:

    Due to mission requirements, unmanned craft vehicle(USV) usually operate in the form of formation cooperation and exchange data through wireless ad hoc networks. Due to the influence of ocean waves and other factors, the channel transmission loss of maritime ad hoc networks is usually in a dynamic state. The existing backoff algorithm of MAC protocol in ad hoc networks cannot distinguish between packet collision and packet loss in a dynamic maritime environment, resulting in the decline of reliability and stability. Therefore, this paper proposes an adaptive minimum contention window backoff algorithm based on channel monitoring. The algorithm estimates the channel state by sensing the number of adjacent contention nodes, reduces the channel collision probability and retransmission times, and improves the reliability and stability of the network as a whole. Simulation results show that compared with the classical BEB algorithm, the throughput and fairness of the improved algorithm are increased by 28.67% and 62.00% respectively, and the end-to-end delay and packet loss rate are reduced by 2.84% and 15.10% respectively.

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  • 收稿日期:2022-06-17
  • 最后修改日期:2022-09-15
  • 录用日期:2022-09-21
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