APPARATUS AND METHOD OF CONTROLLING UPLINK TRANSMISSION POWER IN MULTIPLE COMPONENT CARRIER SYSTEM

摘要

PURPOSE: An uplink transmission power control device and a method thereof are provided to assign transmission power to an uplink channel of serving cells according to a priority. CONSTITUTION: A terminal calculates an E-PH(Estimated-Power Headroom) from second transmission power and first transmission power(S710). The first transmission power schedules for transmitting an uplink signal. The second transmission power is scheduled for transmitting PRACH(Physical Random Access CHannel) mapped on a random access preamble. When the E-PH is smaller than threshold power(S715), the terminal controls the first and the second transmission power based on a power assignment priority(S720). [Reference numerals] (AA) Start; (BB) End; (S700) Generate an uplink signal of a first serving cell; (S705) Receive random access initiation information for a second serving cell; (S710) Calculate estimated excessive power(E-PH); (S720) PHR triggering; (S725) Selectively transmit one of the uplink signal and PRACH according to priority; (S730) Transmit the uplink signal and the PRACH