Taming Cross-Technology Interference for Wi-Fi and ZigBee Coexistence Networks

Recent studies show that Wi-Fi interference has been a major problem for low power urban sensing technology ZigBee networks. Existing approaches for dealing with such interferences often modify either the ZigBee nodes or Wi-Fi nodes. However, massive deployment of ZigBee nodes and uncooperative Wi-Fi users call for innovative cross-technology coexistence without intervening legacy systems. In this work, we investigate the Wi-Fi and ZigBee coexistence when ZigBee is the interested signal. Typically, the duration of transmitting a ZigBee data packet is longer than that of a Wi-Fi packet. Mitigating short duration Wi-Fi interference (called <italic>flash</italic>) in long duration ZigBee data (called <italic>smog</italic>) is challenging. To address these challenges, we propose ZIMO: a sink-based MIMO design for harmony coexistence of ZigBee and Wi-Fi networks with the goal of protecting the ZigBee data packets from being interfered by high-power cross-technology signals. The key insight is to properly exploit opportunities resulted from differences between Wi-Fi and ZigBee, and bridge the gap between interested data and cross technology signals. Also, extracting the channel coefficient of Wi-Fi and ZigBee will enhance other coexistence technologies such as TIMO <xref ref-type="bibr" rid="ref1">[1]</xref> . We implement a prototype in GNURadio-USRP N200, and our extensive evaluations under real wireless conditions show that ZIMO can improve ZigBee network throughput up to 1.9<inline-formula><tex-math notation="LaTeX">$\times$</tex-math> <alternatives><inline-graphic xlink:type="simple" xlink:href="yang-ieq1-2442252.gif"/></alternatives></inline-formula>, with 1.5 <inline-formula><tex-math notation="LaTeX">$\times$</tex-math><alternatives> <inline-graphic xlink:type="simple" xlink:href="yang-ieq2-2442252.gif"/></alternatives></inline-formula> in media, and 1.1<inline-formula> <tex-math notation="LaTeX">$\times$</tex-math><alternatives><inline-graphic xlink:type="simple" xlink:href="yang-ieq3-2442252.gif"/> </alternatives></inline-formula> to 1.9<inline-formula><tex-math notation="LaTeX">$\times$</tex-math><alternatives> <inline-graphic xlink:type="simple" xlink:href="yang-ieq4-2442252.gif"/></alternatives></inline-formula> for Wi-Fi network as byproduct in ZigBee signal recovery.

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