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Enhancement of data transmission for mobile multi hop relay worldwide interoperability for microwave access network

机译:增强移动多跳中继在微波接入网全球互通性方面的数据传输

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摘要

Mobile Multi-hop Relay (MMR) Worldwide Interoperability for Microwave Access (WiMAX) uses Non-Transparent Relay Station (NT-RS) to extend the Base Station (BS) coverage and improve the channel quality and throughput of the network. Nevertheless, the use of NT-RS in MMR WiMAX network increases the delay of relaying packets across multiple hops. Transmission Control Protocol (TCP) and Automatic Repeat reQuest (ARQ) are used to achieve the data transmission reliability in the wireless systems. However, the setting of ARQ parameters are optimised for single hop network and it does not consider the Quality of Service (QoS) limits required of WiMAX networks. In addition, the TCP is adapted to deal with the congestion in the wired network without considering the QoS requirements. In order to enhance the performance of data transmission over MMR WiMAX networks, resource management, transmission control and error control mechanisms should be optimised for MMR WiMAX network. Therefore, this research proposes resource management schemes to decrease the delay of relaying the packets across multiple hops scenario. Transmission control mechanism is then proposed to optimise the transmission control for MMR WiMAX network. Lastly, ARQ parameters are optimised to enhance the link utilisation in order to achieve the QoS rates required. The proposed algorithms performances are evaluated through simulation work. The proposed resource management schemes reduce the delay of relaying packets across multiple hops by 33% and 40% for the second and third hops respectively. Therefore, the link layer throughput is enhanced by 35% and 53% and TCP throughput by 30% and 40% for the second and third hops correspondingly. The proposed transmission control scheme reduces the timeout occurrences which increase the resource utilisation up to 90% and hence the TCP throughput is enhanced by 26% to 75% for different hops. In conclusion, the optimised ARQ parameters for MMR WiMAX network reduce the TCP packet loss by 8%, 44% and 64% for the first, second and third hops. Hence, the link layer and TCP performances are improved by 10% to 140% for diverse scenarios.
机译:移动多跳中继(MMR)全球微波访问互操作性(WiMAX)使用非透明中继站(NT-RS)扩展了基站(BS)的覆盖范围,并提高了网络的信道质量和吞吐量。尽管如此,在MMR WiMAX网络中使用NT-RS会增加跨多跳中继数据包的延迟。传输控制协议(TCP)和自动重复请求(ARQ)用于实现无线系统中数据传输的可靠性。但是,ARQ参数的设置已针对单跳网络进行了优化,并且没有考虑WiMAX网络所需的服务质量(QoS)限制。另外,TCP适于在不考虑QoS要求的情况下处理有线网络中的拥塞。为了增强通过MMR WiMAX网络进行数据传输的性能,应针对MMR WiMAX网络优化资源管理,传输控制和错误控制机制。因此,本研究提出了资源管理方案,以减少跨多跳场景中继数据包的延迟。然后提出了传输控制机制,以优化MMR WiMAX网络的传输控制。最后,优化ARQ参数以提高链路利用率,以达到所需的QoS速率。通过仿真工作评估了所提出算法的性能。所提出的资源管理方案将第二跳和第三跳的多跳中继数据包的延迟分别减少了33%和40%。因此,第二跳和第三跳的链路层吞吐量分别提高了35%和53%,TCP吞吐量分别提高了30%和40%。所提出的传输控制方案减少了超时的发生,从而将资源利用率提高了90%,因此对于不同的跃点,TCP吞吐量提高了26%至75%。总之,针对MMR WiMAX网络的优化ARQ参数可将第一,第二和第三跳的TCP数据包丢失减少8%,44%和64%。因此,在各种情况下,链路层和TCP性能可提高10%至140%。

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