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Summary: Surviving Wi-Fi Interference in Low Power ZigBee Networks
Chieh-Jan Mike Liang, Nissanka Bodhi Priyantha, Jie Liu, Andreas Terzis
Department of Computer Science Microsoft Research
Johns Hopkins University One Microsoft Way
Baltimore, MD Redmond, WA
{cliang4, terzis}@cs.jhu.edu {jie.liu, bodhip}@microsoft.com
Abstract
Frequency overlap across wireless networks with differ-
ent radio technologies can cause severe interference and re-
duce communication reliability. The circumstances are par-
ticularly unfavorable for ZigBee networks that share the 2.4
GHz ISM band with WiFi senders capable of 10 to 100 times
higher transmission power. Our work first examines the in-
terference patterns between ZigBee and WiFi networks at
the bit-level granularity. Under certain conditions, ZigBee
activities can trigger a nearby WiFi transmitter to back off,
in which case the header is often the only part of the Zig-
Bee packet being corrupted. We call this the symmetric in-
terference regions, in comparison to the asymmetric regions
where the ZigBee signal is too weak to be detected by WiFi
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