Exploiting Spatiotemporal Correlation for Wireless Networks Under Interference
Exploiting Spatiotemporal Correlation for Wireless Networks Under Interference
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DOI：
10.1109/tnet.2017.2732238
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发表时间：
2017-10
期刊：
影响因子：
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通讯作者：
S. Kim;Shuai Wang;T. He
中科院分区：
文献类型：
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作者：
S. Kim;Shuai Wang;T. He
本文从一个经验观察附近的无线链路之间的时空相关性的存在在短时间间隔。由于相关干扰的现象已经变得普遍与密集部署的无线设备，导致潜在的错误，在现有的流行的度量建立在链路独立性的假设。为此，我们提出了相关ETX（cETX），它概括了广泛采用的ETX，以保持相关链接下的准确性。据我们所知，这是第一个工作，介绍一个统一的度量拥抱时间和时空相关性。作为一个广义的度量标准，我们工作的重点是对ZigBee的广泛适用性和有效性进行广泛的评估（802.15.4）和Wi-Fi在实验室、走廊和桥梁上部署的802.11b/g/n测试平台表明：只需将ETX替换为cETX：2）在仅增加0.7%的额外开销的情况下，三种单播和九种广播协议的平均通信开销分别节省了22%和37%。
This paper starts from an empirical observation on the existence of spatiotemporal correlation among nearby wireless links within short time intervals. The phenomenon due to correlated interference has become pervasive with densely deployed wireless devices, causing potential errors in existing popular metrics built upon the assumption of link independence. To this end, we propose correlated ETX (cETX), which generalizes the widely-adopted ETX to maintain the accuracy under correlated links. To the best of our knowledge, this is the first work to introduce a unified metric embracing both temporal and spatiotemporal correlations. As a generalized metric, the highlight of our work is the broad applicability and effectiveness–extensive evaluations on ZigBee (802.15.4) and Wi-Fi (802.11b/g/n) testbeds deployed in a lab, corridor, and on a bridge reveal that: simply replacing ETX with cETX: 1) cuts down the error by 62.1%–70.2% and 2) saves averages of 22% and 37% communication cost in three unicast and nine broadcast protocols, respectively, under only 0.7% additional overhead.