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Experimental Evaluation of Coexistence Method for ZigBee under WLAN Interference

Ryosuke Murata1, Masakatsu Ogawa1, Jyunya Fukuzawa1 , Ken Okamoto2, Yuichiro Okugawa2, and Kazuhiro Takaya2
1.Department of Information and Communication Sciences, Sophia University, Tokyo, 102-8554, Japan
2.NTT Energy and Environment Systems Laboratories, NTT Corporation, Tokyo, 180-8585, Japan
Abstract—ZigBee has attracted attention for constructing the sensor network such as home energy management system. Both ZigBee and wireless LAN (WLAN) use a 2.4GHz band, called the industrial, scientific, and medical unlicensed band; therefore, ZigBee faces severe interference problems in the presence of WLAN. Frame collisions are serious problems between ZigBee and WLAN. Both employ a carrier sense mechanism to avoid collision, but both use different channel access mechanisms. The primary problem is the competition that exists between WLAN data frames and ZigBee ACK frames, i.e., because of WLAN interference, ZigBee may not receive any given ACK frame; therefore, the ZigBee transmission success ratio is degraded. To overcome this problem, the authors propose an interference avoidance method that improves ZigBee and WLAN coexistence and utilizes actual equipment to present the experimental evaluation. The experimental results reveal that the ZigBee transmission success ratio increases as the WLAN transmission rate increases. In addition, we clarified the distance in which the proposed method can effectively operate.

Index Terms—Wireless LAN, ZigBee, CSMA, interference, frame collisions

Cite: Ryosuke Murata, Masakatsu Ogawa, Jyunya Fukuzawa, Ken Okamoto, Yuichiro Okugawa, and Kazuhiro Takaya, "Experimental Evaluation of Coexistence Method for ZigBee under WLAN Interference," Journal of Communications, vol. 10, no. 3, pp. 161-169, 2015. Doi: 10.12720/jcm.10.3.161-169
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