A vehicle-based measurement framework for enhancing whitespace spectrum databases

摘要: The present TV whitespace networks rely on spectrum occupancy databases to determine their operating channels. In this paper, we show that such cause non-negligible wastage of spectrum. We also report channels can have very different quality due interference from secondary devices and the leakage broadcasts. Such disparity in channel is not captured by existing databases. propose use measurements overcome above limitations particular, describe a system called V-Scope leverages sensors public vehicles collect road. These are used as "anchor points" construct various models better spectrum, estimate its quality, validate locations primary devices. deployed our single metro bus traveling across mid-sized US city. Based collected at 1 million over 120 square-km area, find commercial database causes under-utilization certain large area (up 71% measured locations). Our reclaim up 59% locations, correctly selecting all suitable 72 -- 83% achieving localization accuracy between 16 27m.