Meeting Bit Error Rate (BER) for a design

SNR (Signal to Noise ratio) is related to BER such that higher SNR means lower BER. SNR margin is amount of additional signal loss that system can tolerate before BER increases above given level. SNR margin can be improved by utilizing DSP Adaptive filters to remove noise from signal. Adaptive filters are good for cancelling inter-Symbol-interference (ISI), echo, NEXT, FEXT.

3G UTRAN

UTRAN: UMTS Terrestrial Radio Access Network
UTRAN is a term comprising RNC, Base station describing 3G architecture.
UTRAN defines folling links:
lu: RNC to Core network connection
lub: RNC to eNodeB (Base station) connection
lur: RNC to RNC connection
uu: RNC to UE (user equipment) connection