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Reliability benefit of network coding and cooperative communication

机译：网络编码和协作通信的可靠性收益

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摘要

Network coding (NC) can reduce the number of packet retransmissions and improve the network reliability in lossy networks. Reliability gain of NC over traditional error control mechanisms has been investigated in recent works. In this paper, we study reliable broadcast in a real-world topology where link loss probabilities are different from each other. We derive approximate closed-form expressions and analyse asymptotic behaviour for expected number of transmissions employing stop-and-wait automatic repeat request (ARQ) and NC as error control mechanisms. In physical layer cooperative communication, multiple nodes can transmit collectively to take advantage of spatial diversity. We incorporate the idea of physical layer cooperative communication with ARQ and NC separately, to obtain further reliability. Numerical results based on our asymptotic analysis indicate that NC offers more reliability than stop-and-wait ARQ. However, as the size of the cooperating set increases, both the schemes offer the same reliability. Approximate closed-form expressions for the reliability metric of these schemes and their asymptotic results match well with simulation results. Furthermore, simulation results establish that the proposed NC scheme outperforms existing schemes in literature.
机译：网络编码（NC）可以减少数据包重传的次数并提高有损网络中的网络可靠性。在最近的工作中，已经研究了相对于传统的错误控制机制，NC的可靠性提高。在本文中，我们研究了链路损耗概率互不相同的真实拓扑中的可靠广播。我们推导近似的闭式表达式，并使用停止和等待自动重发请求（ARQ）和NC作为错误控制机制来分析预期传输次数的渐近行为。在物理层协作通信中，多个节点可以集中传输以利用空间分集。我们分别结合了与ARQ和NC进行物理层协作通信的想法，以获得更高的可靠性。根据我们的渐近分析的数值结果表明，NC提供的可靠性比停止等待的ARQ高。但是，随着协作集大小的增加，两种方案都提供相同的可靠性。这些方案的可靠性度量的近似闭合形式表达式及其渐近结果与仿真结果非常吻合。此外，仿真结果表明，提出的数控方案优于文献中的现有方案。

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