METHOD AND APPARATUS FOR ESTIMATING A POWER HEADROOM FOR ENHANCED DEDICATED CHANNEL TRANSMISSIONS IN CELL_FACH STATE AND IDLE MODE

摘要

A method for performing E-TFC restriction for enhanced dedicated channel, E-DCH, transmissions in Cell_FACH state or idle mode. A WTRU transmitting a random access channel, RACH, preamble and the WTRU receiving an index to an enhanced dedicated channel, E-DCH, resource in response to the RACH preamble. The WTRU estimating the power headroom for at least an initial E-TFC restriction based on at least a WTRU maximum transmit power, a power offset value and a last transmitted RACH preamble transmit power; and the WTRU performing E-DCH transport format combination, E-TFC, restriction to determine a set of supported E-TFCs based on the estimated power headroom.