Rohan Murty, Ranveer Chandra, Thomas Moscibroda, and Paramvir Bahl
20 September 2010
The recent FCC ruling has opened up the possibility of wireless network deployments over white spaces, i.e., vacant UHF TV channels. A key requirement for any white space device is that it must ensure that none of of its transmissions interfere with incumbents, namely TV transmitters and wireless microphones. For this purpose, there has been a lot of effort on spectrum sensing techniques that allow white space devices to decide which parts of the spectrum is currently occupied by primary users. While potentially feasible, spectrum sensing at the low thresholds required to protect incumbents is technically challenging. In this paper, we propose and design an alternative approach to opportunistic wireless networking in white spaces that does not require any sensing. Governed by unique system design constraints characteristic to white space wireless networks, we devise and develop system \, a system that combines sophisticated signal propagation modeling with an efficient content dissemination mechanism to ensure efficient, scalable, and safe white space network operation. We compare our results to ground truth spectrum measurements and present detailed evaluation of our infrastructure and service.