GreenAir: Harmonic CTI relaxation under massive heterogeneous wireless devices
Daehyun Ban, Sangsoon Lim, Seongwon Han, Woojin Park · 2017
Recently, the simultaneous usage of various wireless technologies, such as Wi-Fi, Bluetooth, ZigBee and so on, becomes common and the propensity tends to be more complicated with the prevalence of smart and IoT devices. Such technology increments, however, intensify challenging Cross-Technology Interference (CTI) issues in a shared wireless band. To circumvent the hurdle, we propose a way which minimizes the medium occupation of wireless devices, called GreenAir. In the range of preserving network performances like connectivity and delay, GreenAir supports to generate the lesser communication links among homogeneous devices by utilizing a duty-cycle control. We experiment whether such approach is feasible to reduce CTI under the mixture of heterogeneous devices. Through retransmission and throughput measures in the combined use of Wi-Fi, ZigBee and Microwave oven (aggressive offender in ISM band), we validate that there exist large margins to reduce CTI via OPNET modeler. For the better applicability in IoT surroundings where the addition/removal of devices is arbitrary and frequent, we further tailor the operation of GreenAir to be distributed and autonomous. As our approach only requires local communications among homogeneous devices, the usability of GreenAir is device-agnostic.