arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1003.0248cs.ITcs.NImath.ITmath.STstat.TH
收藏

一般Ad Hoc网络在高可靠性条件下的中断概率

Outage Probability of General Ad Hoc Networks in the High-Reliability Regime

Riccardo Giacomelli, Radha Krishna Ganti, Martin Haenggi

摘要:

无线网络中的中断概率取决于各种因素:节点分布,MAC方案,以及路径损耗,衰落和传输成功的模型。在以前的工作中断表征随机放置的节点的网络中,大部分的重点放在网络的节点是泊松分布和ALOHA被用作MAC协议。在本文中,我们提供了一个一般的框架,在高可靠性制度的中断概率分析。中断概率表征基于两个参数:在[1]中介绍的网络的固有空间竞争$γ$,以及由本文介绍的干扰标度指数$κ$测量的MAC实现的协调水平。我们研究了信号干扰比(SIR)模型,瑞利衰落和幂律路径损耗下的中断概率,并解释了这两个参数如何依赖于网络模型。主要的结果是,中断概率接近$γη^κ$的密度的干扰$η$去为零,$κ$假设的值范围$1\leq κ\leq α/2$的所有实际的MAC协议,其中$α$是路径损耗指数。这个渐近表达式对所有运动不变的点过程都是有效的。我们提出了一种新的和完整的分类MAC协议的基础上的价值$κ$。最后,我们的研究结果提出了一个猜想,严格限制的中断概率为所有的密集度。

英文摘要:

Outage probabilities in wireless networks depend on various factors: the node distribution, the MAC scheme, and the models for path loss, fading and transmission success. In prior work on outage characterization for networks with randomly placed nodes, most of the emphasis was put on networks whose nodes are Poisson distributed and where ALOHA is used as the MAC protocol. In this paper we provide a general framework for the analysis of outage probabilities in the high-reliability regime. The outage probability characterization is based on two parameters: the intrinsic spatial contention $γ$ of the network, introduced in [1], and the coordination level achieved by the MAC as measured by the interference scaling exponent $κ$ introduced in this paper. We study outage probabilities under the signal-to-interference ratio (SIR) model, Rayleigh fading, and power-law path loss, and explain how the two parameters depend on the network model. The main result is that the outage probability approaches $γη^κ$ as the density of interferers $η$ goes to zero, and that $κ$ assumes values in the range $1\leq κ\leq α/2$ for all practical MAC protocols, where $α$ is the path loss exponent. This asymptotic expression is valid for all motion-invariant point processes. We suggest a novel and complete taxonomy of MAC protocols based mainly on the value of $κ$. Finally, our findings suggest a conjecture that tightly bounds the outage probability for all interferer densities.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑