Metronome: coordinating spectrum sharing in heterogeneous wireless networks
COMSNETS'09 Proceedings of the First international conference on COMmunication Systems And NETworks
Surviving wi-fi interference in low power ZigBee networks
Proceedings of the 8th ACM Conference on Embedded Networked Sensor Systems
Beyond co-existence: Exploiting WiFi white space for Zigbee performance assurance
ICNP '10 Proceedings of the The 18th IEEE International Conference on Network Protocols
Enabling coexistence of heterogeneous wireless systems: case for ZigBee and WiFi
MobiHoc '11 Proceedings of the Twelfth ACM International Symposium on Mobile Ad Hoc Networking and Computing
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As the ISM spectrum becomes crowded by various network devices, such as WiFi and ZigBee, the coexistence between them poses a critical challenge, due to their heterogeneous MAC/PHY layers. Recent measurement studies have shown moderate to high WiFi traffic to severely impair coexisting ZigBee's performance. We propose a new mechanism, called cooperative busy tone (CBT), that exploits the inherent cooperation among ZigBee nodes to harmonize their coexistence with WiFi devices. CBT employs a separate ZigBee node to emit a busy-tone concurrently with the desired data transmission, thereby improving the visibility of ZigBee devices to WiFi. It adopts an innovative way to concurrently schedule the busy-tone and a data packet without causing interference between them. To optimize CBT, we establish a theoretical framework that models the performance of coexisting ZigBee and WiFi networks, and analyzes the impact of key design parameters in CBT. Our analytical results and testbed implementation demonstrate CBT's significant throughput improvement over the legacy ZigBee protocol, with negligible performance loss to WiFi.