1. 3 rd Generation Partnership Project Motivation for 3GPP Release 8 - The LTE Release , http://www.3gpp.org/lte 2010
2. 3 rd Generation Partnership Project Technical Specification Group, Core Network & Terminals, General Packet Radio Service (GPRS); GPRS Tunneling Protocol (GTP) Across the Gn and Gp interface , Specification 29.060, Release 10, 2011
3. 3 rd Generation Partnership Project Technical Specification Group, Service & Systems Aspects, IP Multimedia Subsystem (IMS); Stage 2 , Specification 23.228, Release 11, 2011
4. 3 rd Generation Partnership Project Technical Specification Group, Service & Systems Aspects, Service requirements for the Evolved Packet System (EPS) , Specification 22.278, Release 11, 2011
5. 3 rd Generation Partnership Project Technical Specification Group, Service & Systems Aspects, General Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access , Specification 23.401, Release 10, June 2011