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An Empirical Interference Modeling for Link Reliability Assessment in Wireless Networks

机译:无线网络链路可靠性评估的经验干扰模型

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In recent years, it has been widely believed in the community that the link reliability is strongly related to received signal strength indicator (RSSI) [or signal-to-interference-plus-noise ratio (SINR)] and external interference makes it unpredictable, which is different from the previous understanding that there is no tight relationship between the link reliability and RSSI (or SINR), but multipath fading causes the unpredictability. However, both cannot fully explain why the unpredictability appears in the link state. In this paper, we unravel the following questions: 1) What causes frame losses that are directly related to intermediate link states? 2) Is RSSI or SINR a right criterion to represent the link reliability? 3) Is there a better measure to assess the link reliability? We first configured a testbed for performing a real measurement study to identify the causes of frame losses, and observed that link reliability depends on an intraframe SINR distribution, not a single value of RSSI (or SINR). We also learned that an RSSI value is not always a good indicator to estimate the link state. We then conducted a further investigation on the intraframe SINR distribution and the relationship between the SINR and link reliability with the ns-2 simulator. Based on these results, we finally propose an interference modeling framework for estimating link states in the presence of wireless interferences. We envision that the framework can be used for developing link-aware protocols to achieve their optimal performance in a hostile wireless environment.
机译:近年来,在社区中广泛认为,链路可靠性与接收信号强度指示符(RSSI)[或信号与干扰加噪声比(SINR)]密切相关,并且外部干扰使其变得不可预测,这与以前的理解不同,即链路可靠性和RSSI(或SINR)之间没有紧密的关系,但是多径衰落会导致不可预测性。但是,两者都无法完全解释为什么不可预测性会出现在链接状态中。在本文中,我们提出以下问题:1)什么原因导致帧丢失与中间链路状态直接相关? 2)RSSI或SINR是代表链路可靠性的正确标准吗? 3)是否有更好的方法来评估链路可靠性?我们首先配置了一个测试台,用于执行实际测量研究以识别帧丢失的原因,并观察到链路可靠性取决于帧内SINR分布,而不是RSSI(或SINR)的单个值。我们还了解到,RSSI值并非始终是评估链接状态的良好指标。然后,我们对帧内SINR分布以及ns-2模拟器的SINR与链路可靠性之间的关系进行了进一步研究。基于这些结果,我们最终提出了一种干扰建模框架,用于在存在无线干扰的情况下估计链路状态。我们设想该框架可用于开发可感知链接的协议,以在恶意无线环境中实现其最佳性能。

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