1. 3G Tutorial, UMTS overview. http://www.umtsworld.com/technology/overview.htm .
2. 3GPP TS 23.101, General Universal Mobile Telecommunications System (UMTS) architecture, Release 6, (January 2005).
3. 3GPP TS 23.107, QoS Concept and Architecture, Release 9.0, (June 2010).
4. Blake, S., et al. (1998). An architecture for differentiated services. IETF RFC 2475.
5. Jacobson, V., et al. (1999). An expedited forwarding PHB. IETF RFC 2598.