Exploiting WiFi Guard Band for Safeguarded ZigBee
Exploiting WiFi Guard Band for Safeguarded ZigBee
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DOI：
10.1145/3274783.3274835
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发表时间：
2018-11
期刊：
影响因子：
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通讯作者：
Yoon Chae;Shuai Wang;S. Kim
中科院分区：
文献类型：
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作者：
Yoon Chae;Shuai Wang;S. Kim
来自密集和普遍无线的跨技术干扰（CTI）已成为低功耗物联网的主要威胁。本文介绍了G-Bee，CTI避免技术，唯一的地方ZigBee数据包的保护频带上正在进行的WiFi流量，有效地保护数据包从WiFi干扰。这样的设计确保了可靠的ZigBee通信，即使在饱和的WiFi流量下，传统的ZigBee被认为是不可操作的。技术亮点是轻量级WiFi保护带捕获机制，使用ZigBee PHY层样本，可直接在各种商用ZigBee芯片中访问。G-Bee的另一个独有特征是频谱同步低占空比-通过利用周期性WiFi信标的保护频带，有效地将活动时隙与频谱可用性同步（即，保护带）以显著改善延迟。对我们的原型系统进行的广泛评估表明，G-Bee PRR超过95%，而传统ZigBee在数百个WiFi用户的严重干扰下下降到15%以下，低占空比延迟减少了87.5%，所有这些都是在0.3%的计算开销下实现的。
Cross-technology interference (CTI) from dense and prevalent wireless has become a primary threat to low-power IoT. This paper presents G-Bee, a CTI avoidance technique that uniquely places ZigBee packet on the guard band of ongoing WiFi traffic, which effectively safeguards the packet from WiFi interference. Such design ensures reliable ZigBee communication even under saturated WiFi traffic where traditional ZigBee is considered inoperable. Technical highlight is in lighweight WiFi guard band capture mechanism using ZigBee PHY layer samples directly accessible in various commercial ZigBee chip. Another exclusive feature of G-Bee is spectrum-synchronized low duty cycling - by utilizing guard bands of periodic WiFi beacons, active slots are effectively synchronized to spectrum availability (i.e., guard band) for significant delay improvement. Extensive evaluations on our prototype system demonstrates G-Bee PRR over 95% where legacy ZigBee drops to below 15% under significant interference with hundreds WiFi users and reduction of low duty cycle delay by 87.5%, all of which are achieved with a light computational overhead of 0.3%.