Performance Analysis of Hybrid Error Recovery Methods for Reliable Multicast in Wireless Networks
Performance Analysis of Hybrid Error Recovery Methods for Reliable Multicast in Wireless Networks
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发表时间：
2004
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則 鈴木偉元†上野英俊†石川憲洋†高橋修††佐藤文明†††水野忠;Hideharu Suzuki;Hidetoshi Ueno;N. Ishikawa;Osamu Takahashi;Fumiaki Satoh;Tadanori Mizuno;静岡大学情報学部
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作者：
則 鈴木偉元†上野英俊†石川憲洋†高橋修††佐藤文明†††水野忠;Hideharu Suzuki;Hidetoshi Ueno;N. Ishikawa;Osamu Takahashi;Fumiaki Satoh;Tadanori Mizuno;静岡大学情報学部
对于错误率波动较大的突发错误，需要采用自动重复请求（ARQ）来恢复。前向纠错（Forward Error Correction， FEC）适用于随机错误，可以减少错误恢复过程造成的延迟时间。通常，ARQ和FEC的组合具有上述对称特征，具有强大的错误恢复能力，但很难确定最优参数值，例如FEC的代码参数：（n,k）。本文介绍了将ARQ和FEC相结合的混合错误恢复方法是实现可靠组播的必要条件，并将其应用于无线网络中的大容量数据传输。为了解决上述FEC的码参数问题，本文定义了一个处理时间和包数相乘的性能函数，并提出了如何通过最小化利用该函数计算的整个通信成本来求出该值的答案。通过对现有错误恢复技术（如ARQ、主动FEC和被动FEC）的理论分析，对混合方法的配置进行了检验，这些技术涉及数据包总数和完成整个大容量数据传输之前的总处理时间。在无线局域网中进行的实验表明，与普通ARQ方法相比，混合方法对组播通信性能的影响有所改善。本文通过数值算例的理论分析和原型系统的实验值表明，所提出的函数是可以得到结论的。
†† † †† ††† ††† Automatic Repeat Request (ARQ) is necessary for recovering a burst error that has a large fluctuation of error rate. Forward Error Correction (FEC) is suitable for a random error and can reduce delay time cased by the error recovery process. In general, the combination of ARQ and FEC that has symmetrical features aforementioned gives an almighty faculty for error recovery, but it is hard to determine an optimal parameter value, such as FEC’s code parameter: (n,k). This paper describes that the hybrid error recovery method combined ARQ and FEC is necessary for a reliable multicast, which is utilized for bulk-data transfer in wireless networks. In order to solve the aforementioned FEC’s code parameter issue, this paper defines a performance function that does multiplication processing time and number of packets and proposes how to work out an answer of the value by minimizing a whole communication cost calculated by using the proposed function. The configuration of the hybrid method is examined through a theoretical analysis of existing error recovery techniques such as ARQ, Pro-active FEC and Reactive FEC concerning a total number of packets and a total processing time until finishing a whole bulk-data transfer. An experiment using a wireless-LAN shows an improvement impact of multicast communication performance in comparison between the hybrid method and an ordinary ARQ method. This paper shows that the proposed function is able to reach a conclusion by making use of a theoretical analysis with numerical examples and an experimental value obtained from a prototype system.