水声通信中选择性重复ARQ传输时延分析

Mingsheng Gao, Jian Li, Wei Li, N. Xu
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引用次数: 1

摘要

尽管选择性重复请求(SR-ARQ)是最有效的自动重复请求(ARQ)协议,但由于典型水声调制解调器的半双工特性,SR-ARQ在水声通信中被认为是不可行的。然而,在类似于杂耍的停止等待(JSW)传输方案的帮助下,它现在变得可行了。本文在静态假设发送端和接收端之间的相对径向速度为零的情况下,对运行在JSW方案上的SR-ARQ的交付延迟(包括传输延迟和重排序延迟)进行了评估,旨在为系统设计者在更一般的场景下进行延迟评估提供有价值的参考。我们将水声信道建模为两态离散时间马尔可夫信道,并推导了在交通拥挤情况下的传递延迟的封闭表达式。与大多数计算复杂度随往返时延呈指数增长的地面通信SR-ARQ延迟分析方法不同,本文提出的分析方法不受往返时延的影响。这也使我们的方法适用于地面通信。为了强调我们的方法的准确性,我们还提供了分析和模拟结果之间的比较。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Delivery Delay Analysis of Selective Repeat ARQ in Underwater Acoustic Communications
Despite being the most efficient automatic repeat request (ARQ) protocol, the selective-repeat ARQ (SR-ARQ) is previously thought to be infeasible in underwater acoustic communications owing to the half-duplex property of typical underwater acoustic modems. However, with the help of the juggling-like stop-and-wait (JSW) transmission scheme, it has now become feasible. In this paper, we evaluate the delivery delay (consisting of transmission and resequencing delays) of the SR-ARQ operating over the JSW scheme under the static assumption that the relative radial velocity between the transmitter and the receiver is zero, aiming to provide system designers with a valuable reference for delay evaluation under more general scenarios. We model the underwater acoustic channel as a two-state Discrete Time Markov Channel, and derive the closed-form expression for the delivery delay under heavy traffic situation. Unlike most analytical approaches for the delay analysis of SR-ARQ in terrestrial communications whose computational complexities grow exponentially with round-trip delay, our proposed analytical approach is immune to the round-trip delay. This also makes our approach suitable for terrestrial communications. To highlight the accuracy of our approach, we also provide comparisons between analytical and simulation results.
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