DYNAMIC FORWARD ERROR CORRECTION IN UTRA SYSTEMS

摘要

A UE transmitter in a 3G UTRAN wireless communication system performs dynamic 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). Since this adjustment occurs at each TTI, mapping of data packet codes in each time 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.