Measurement-based characterization of 802.11 in a hotspot setting
Proceedings of the 2005 ACM SIGCOMM workshop on Experimental approaches to wireless network design and analysis
Understanding and mitigating the impact of RF interference on 802.11 networks
Proceedings of the 2007 conference on Applications, technologies, architectures, and protocols for computer communications
New insights from a fixed-point analysis of single cell IEEE 802.11 WLANs
IEEE/ACM Transactions on Networking (TON)
Minimizing 802.11 interference on ZigBee medical sensors
BodyNets '09 Proceedings of the Fourth International Conference on Body Area Networks
Metronome: coordinating spectrum sharing in heterogeneous wireless networks
COMSNETS'09 Proceedings of the First international conference on COMmunication Systems And NETworks
Beyond co-existence: Exploiting WiFi white space for Zigbee performance assurance
ICNP '10 Proceedings of the The 18th IEEE International Conference on Network Protocols
A case for the coexistence of heterogeneous wireless networks
S3 '11 Proceedings of the 3rd ACM workshop on Wireless of the students, by the students, for the students
Cognitive sensor networks implementation in medical environmental surveillance
Proceedings of the 7th International Conference on Body Area Networks
Cooperative carrier signaling: harmonizing coexisting WPAN and WLAN devices
IEEE/ACM Transactions on Networking (TON)
A wireless application overlay for ubiquitous mobile multimedia sensing and interaction
Proceedings of the 5th ACM Multimedia Systems Conference
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The ISM spectrum is becoming increasingly populated by emerging wireless networks. Spectrum sharing among the same network of devices can be arbitrated by MAC protocols (e.g., CSMA), but the coexistence between heterogeneous networks remains a challenge. The disparate power levels, asynchronous time slots, and incompatible PHY layers of heterogeneous networks severely degrade the effectiveness of traditional MAC. In this paper, we propose a new mechanism, called the Cooperative Busy Tone (CBT), that enables the reliable coexistence between two such networks, ZigBee and WiFi. CBT allows a separate ZigBee node to schedule a busy tone concurrently with the desired transmission, thereby improving the visibility of ZigBee devices to WiFi. Its core components include a frequency flip scheme that prevents the mutual interference between cooperative ZigBee nodes, and a busy tone scheduler that minimizes the interference to WiFi, for both CSMA and TDMA packets. To optimize CBT, we establish an analytical framework that relates its key design parameters to performance and cost. Both the analytical and detailed simulation results demonstrate CBT's significant throughput improvement over the legacy ZigBee protocol, with negligible performance loss to WiFi. The results are validated further by implementing CBT on sensor motes and software radios.