ETSI TS 121 101
ETSI TS 121 101
Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); 3rd Generation mobile system Release 1999 Specifications (3GPP TS 21.101 version 3.3.0 Release 1999)
standard published 03/01/2001 by European Telecommunications Standards Institute
