Patent ID: 7512086

Claim:
A method of being approved data transmission from a UTRAN (UMTS Terrestrial Radio Access Network) in a TDD (Time Division Duplexing) CDMA (Code Division Multiple Access) mobile telecommunication system where a frame has a plurality of sub-frames, each sub-frame has a plurality of time slots, and each time slot has a plurality of channels identified by codes, the method comprising the steps of: selecting one of a plurality of sync codes; transmitting information about the selected sync code in a time slot of a sub-frame to the UTRAN; receiving the sync code information, information about an arrival time of the sync code, time update information indicating a variation in a transmission time of data, and power control information indicating an adjustment to a power gain in a UE (User Equipment) from the UTRAN on an FPACH (Fast Physical Access Channel); and transmitting RACH data on a P-RACH (Physical Random Access Channel) mapped from the FPACH according to the time update information and the power control information, the sync code information is received by monitoring as many sub-frames as a quotient of a number of the plurality of sync codes divided by a number of FPACHs per sub-frame, for the FPACH, after transmission of the sync code.