In one embodiment, a touch sensor includes one or more meshes of conductive material. The data transmission session may comprise a Bluetooth PHY andor MACPHY layer that enables the wireless devices to perform discovery, pairing, and security setup operations. Additionally, the control unit in the radio base station estimates the PDCCH quality corresponding to the local sector on the basis of a SINR obtained from the measured W-CQIs and also on the basis of the utilization ratios of PDCCHs and PDSCHs corresponding to other sectors. The duct inhibits diffusion of uncombusted gasoline back through the duct from the engine, after the engine has been shut off.