A system for controlling a roller shade having a roller tube windingly receiving a shade fabric varies roller tube rotational speed for constant linear shade speed. The float arm holder is made of conductive resin. , using PDCCH andor E-PDCCH, for scheduling of data resources on SCC thus simultaneously serving legacy and non-legacy UEs, e. A force generating member is mounted in the housing and contacts the arm so as to urge the arm to pivot about the pivot member and press against the cartridge unit. Thus, parameters related to mobility and a velocity saturation effect are extracted with consistency in a form matching with remaining E-T data.