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arXiv 1206.0107cs.NI
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基于载波侦听的无线Ad Hoc网络中的协作--II:主动机制

Cooperation in Carrier Sense Based Wireless Ad Hoc Networks - Part II: Proactive Schemes

Andrea Munari, Marco Levorato, Michele Zorzi

摘要:

这项工作是第二个两部分的一系列文件的有效性合作技术在非集中式载波感知为基础的ad hoc无线网络。虽然第一部分广泛讨论了反应式合作,其特征在于在预期的接收器的故障事件触发的中继传输,第二部分深入研究主动解决方案,其中数据包的源利用信道状态信息抢先协调中继,以实现最佳的整体速率的目的地。特别是,这项工作表明,通过分析和仿真,反应性合作的性能降低所考虑的介质访问策略,这会导致可用的中继的分布,将它们定位在不利的位置,速率优化的固有性质。此外,高度动态的干扰特性,非基础设施的ad hoc网络被证明是妨碍的效率和可靠性的抢先分配的合作链路,因为不可预测的出生和死亡的周围传输可能会迫使中继中止其支持和/或改变在预期的接收器的最大可实现的速率。作为一个普遍的结论,我们的工作广泛表明,基于CSMA的链路层不容易有效地支持合作策略,在大规模的非集中式ad hoc网络。

英文摘要:

This work is the second of a two-part series of papers on the effectiveness of cooperative techniques in non-centralized carrier sense-based ad hoc wireless networks. While Part I extensively discussed reactive cooperation, characterized by relayed transmissions triggered by failure events at the intended receiver, Part II investigates in depth proactive solutions, in which the source of a packet exploits channel state information to preemptively coordinate with relays in order to achieve the optimal overall rate to the destination. In particular, this work shows by means of both analysis and simulation that the performance of reactive cooperation is reduced by the intrinsic nature of the considered medium access policy, which biases the distribution of the available relays, locating them in unfavorable positions for rate optimization. Moreover, the highly dynamic nature of interference that characterizes non-infrastructured ad hoc networks is proved to hamper the efficacy and the reliability of preemptively allocated cooperative links, as unpredicted births and deaths of surrounding transmissions may force relays to abort their support and/or change the maximum achievable rate at the intended receiver. As a general conclusion, our work extensively suggests that CSMA-based link layers are not apt to effectively support cooperative strategies in large-scale non-centralized ad hoc networks.

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