Coverage-Extended Cooperative Geographic Routing with Optimal Power Allocation for Wireless Multihop Networks

S. Syue, Chin-Liang Wang, Vincent Gauthier, P. Tsai
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Abstract

Cooperative geographic routing has emerged as an efficient, scalable routing paradigm that exploits the joint merit of cooperative diversity and position-aided localized operation to enhance the network performance. In terms of the hop efficiency, an existing scheme called Relay-Aware Cooperative Routing (RACR) has offered a cross-layer approach based on its quantitative study of how physical-layer cooperation leads to link-layer radio coverage extension, under the policy of equal power allocation (EPA) over the cooperating nodes. However, the effect of cooperation-based radio coverage extension dramatically varies with the power allocation policy in use. In this paper, we extend the RACR scheme by addressing a power-optimized cooperative geographic routing problem. With the joint optimization of relaying position and power allocation, the maximum cooperative transmission range is derived. We then, according to the result, present a modified cross-layer routing protocol taking into account the effectuation of optimal power allocation (OPA). Simulation results show that the proposed scheme effectively improves the coverage extension performance as well as reduces the average number of hops.
无线多跳网络覆盖扩展协同地理路由的最优功率分配
协作地理路由是一种高效、可扩展的路由模式,它利用协作多样性和位置辅助本地化操作的共同优点来提高网络性能。在跳数效率方面,已有的中继感知合作路由(Relay-Aware Cooperative Routing, RACR)方案通过定量研究物理层合作如何导致链路层无线电覆盖扩展,在合作节点上的功率分配(EPA)策略下,提供了一种跨层方法。然而,基于协作的无线电覆盖扩展的效果会随着功率分配策略的不同而发生很大的变化。在本文中,我们通过解决一个功率优化的协作地理路由问题来扩展RACR方案。通过对继电位置和功率分配的联合优化,推导出最大协同传输距离。在此基础上,提出了一种考虑最优功率分配(OPA)的改进的跨层路由协议。仿真结果表明,该方案有效地提高了覆盖扩展性能,减少了平均跳数。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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