1. 3GPP (2002). Technical specification group services and system aspects: ue radio transmission and reception (Release 5). ts 25.101 version 5.2.0.
2. 3GPP (2004). General universal mobile telecommunications system (UMTS) architecture (Release 6). TS 23.101 version 6.0.0.
3. 3GPP (2006). Physical channels and mapping of transport channels onto physical channels (FDD) (Release 7). TS 25.211 version 7.1.0.
4. 3GPP (2006). Quality of service (QoS) concept and architecture (Release 6). TS 23.107 version 6.4.0.
5. Al-Begain, K., & Awan, I. (2003). Modelling differentiated services in UMTS networks. In 11th IEEE/ACM international symposium on modeling, analysis and simulation of computer telecommunications systems, MASCOTS 2003, pp. 164–171.