The configuration of RRC inactivity timers in a W-CDMA network has considerable impact on the battery life of a phone when a packet data connection is open. The RRC idle mode (no connection) has the lowest energy consumption. The states in the RRC connected mode, in order of decreasing power consumption, are
CELL_DCH (Dedicated Channel),
CELL_FACH (Forward Access Channel),
CELL_PCH (Cell Paging Channel) and
URA_PCH (
URA Paging Channel). The power consumption in the CELL_FACH is roughly 50 percent of that in CELL_DCH, and the PCH states use about 1-2 percent of the power consumption of the CELL_DCH state. Another factor is that not all operators use the PCH states. ==See also==