DYNAMIC FORWARD ERROR CORRECTION IN UTRA SYSTEMS

摘要

A UE transmitter in a 3G UTRAN wireless communication system performs dynami c link adaptation (DLA) with dynamic semi-static parameters for overcoming RF propagation difficulties. Separate transport channels (DCH) are defined for each semi-static parameter, including forward error coding (FEC) coding type and rate (Step 201/202). When data rate is decreased during DLA, a TFC is selected having the desired FEC coding type and rate (Step 203/204/205). Sin ce this adjustment occurs at each TTI, mapping of data packet codes in each tim e slot on the physical channel includes the benefit of FEC rather than reduced data rate alone. This permits improved SIR in a timeslot that may be experiencing RF propagation difficulties during the UL mapping process.