'Digital cellular telecommunications system (Phase 2+); Mobile radio interface layer 3 specification; Radio Resource Control Protocol (3GPP TS 04.18 version 8.14.0 Release 1999); ETSI TS 101 503', ETSI STANDARDS, LIS, SOPHIA ANTIPOLIS CEDEX, FRANCE, vol. 3-G2;SMG2, no. V8.14.0, 1 April 2002 (2002-04-01), XP014006417, ISSN: 0000-0001