Enabling Coexistence of Heterogeneous Wireless Systems: Case for ZigBee and WiFi
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, the authors propose a new mechanism, called the Cooperative Busy Tone (CBT), which enables the reliable coexistence between two such networks, ZigBee and WiFi.