改进了EDF算法和WiMAX架构,保证了多跳网络的端到端延迟

V. Sagar, D. Das
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引用次数: 12

摘要

基于多跳中继的WiMAX架构是目前提出的解决困难地形连接的方案之一,也是发展中国家/欠发达国家的经济解决方案。本文分析了一种由mesh和PMP两种连接类型组成的混合多跳结构。为了提供这种混合连接,提出了中继站(RS)体系结构。此外,为了在这种多跳网络中提供端到端的延迟保证,提出了一种新的调度算法——改进的最早截止时间优先算法(MEDF)。MEDF在具有不同延迟需求的流之间提供公平性和每跳延迟保证。对MEDF进行了广泛的仿真和分析。将结果与类似场景下的最早截止日期优先调度(EDF)进行了比较,结果表明MEDF能够提供更好的端到端延迟性能。MEDF还确保视频会议会话的语音和视频分组的平均端到端延迟之间的差异在感知质量(QoP)的规定延迟限制内(即在30毫秒内)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Modified EDF algorithm and WiMAX architecture to ensure end-to-end delay in multi-hop networks
Multi-hop relay based WiMAX architecture is one of the proposed solutions to connectivity in difficult terrains and an economical solution for developing/under-developed countries. This paper analyzes a hybrid multi-hop architecture consists of mesh and PMP both types of connections. Architecture for relay station (RS) has been proposed to provide such hybrid connectivity. Moreover, to provide end-to-end delay guarantee in such multi-hop networks a novel-scheduling algorithm, modified earliest deadline first (MEDF) has been proposed. MEDF provides fairness along with per hop delay guarantees among flows with different delay requirements. Extensive simulation and analysis of MEDF has been done. Results are compared with earliest deadline first (EDF) scheduling under similar scenario, which shows that MEDF is able to provide better end-to-end delay performance. MEDF also ensures the difference between average end-to-end delay of voice and video packets of video-conferencing session is within prescribed delay limit (i.e. within 30 msec) of quality of perception (QoP).
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