1. 3GPP 2008 All-IP Network (AIPN) Feasibility Study
2. 3GPP 2008 3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; 3GPP System Architecture Evolution: Report on Technical Options and Conclusions
3. 3GPP 2008 Study on Evolved UTRA and UTRAN
4. 3GPP 2008 Requirements for Evolved UTRA (E-UTRA) and Evolved UTRAN (E-UTRAN)
5. 3GPP 2010 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access Network (E-UTRAN); S1 Application Protocol (S1AP)