Outage, Local Throughput, and Capacity of Random Wireless Networks
Outage, Local Throughput, and Capacity of Random Wireless Networks
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DOI：
10.1109/twc.2009.090105
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发表时间：
2009-08-01
影响因子：
10.4
通讯作者：
Haenggi, Martin
中科院分区：
文献类型：
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作者：
Haenggi, Martin
中断概率和单跳吞吐量是已经针对某些特定类型的无线网络进行评估的两个重要性能度量。然而，有一个更大的类的网络缺乏全面的结果，也没有系统的方法，允许方便地比较网络的性能与不同的几何形状和水平的randoms.The不确定性立方体的引入来分类的不确定性存在于一个网络。立方体的三个轴表示干扰受限网络中不确定性的三个主要潜在来源：节点分布、信道增益（衰落）和信道接入方案（发送节点集）。对于性能分析，定义了一个新的参数，即所谓的空间竞争。它测量ALOHA网络中的中断概率的斜率，作为p = 0时的发送概率p的函数。中断被定义为在给定时隙中信号干扰比（SIR）低于某个阈值的事件。结果表明，空间竞争是足够的特征中断和吞吐量在大类的无线网络，对应于不同的位置上的不确定性立方体。现有的结果被放置在这个框架中，和新的derived.Further，解释中断概率的SIR分布，单位距离链路的遍历容量的确定和固定（尚未优化）的传输速率可实现的吞吐量相比。
Outage probabilities and single-hop throughput are two important performance metrics that have been evaluated for certain specific types of wireless networks. However, there is a lack of comprehensive results for larger classes of networks, and there is no systematic approach that permits the convenient comparison of the performance of networks with different geometries and levels of randomness.The uncertainty cube is introduced to categorize the uncertainty present in a network. The three axes of the cube represent the three main potential sources of uncertainty in interference-limited networks: the node distribution, the channel gains (fading), and the channel access scheme (set of transmitting nodes). For the performance analysis, a new parameter, the so-called spatial contention, is defined. It measures the slope of the outage probability in an ALOHA network as a function of the transmit probability p at p = 0. Outage is defined as the event that the signal-to-interference ratio (SIR) is below a certain threshold in a given time slot. It is shown that the spatial contention is sufficient to characterize outage and throughput in large classes of wireless networks, corresponding to different positions on the uncertainty cube. Existing results are placed in this framework, and new ones are derived.Further, interpreting the outage probability as the SIR distribution, the ergodic capacity of unit-distance links is determined and compared to the throughput achievable for fixed (yet optimized) transmission rates.