Wireless Oom

Active set is the set of cells to which the UE is simultaneously connected during soft handover.

Due to soft handover, the classification of SRNC and DRNC occurs:
1. SRNC: Serving Radio Network Controller
2. DRNC: Drift Radio Network Controller
SRNC is the RNC which combines signals from multiple node Bs and sends them to CN (SGSN for PS, MSC for CS).