1. 3GPP. (2010). Evolved universal terrestrial radio access (E-UTRA), Packet data convergence protocol (PDCP) specification. TS 36.323, 3rd generation partnership project (3GPP). http://www.3gpp.org/ftp/Specs/html-info/36323.htm . Accessed 12 Feb 2015.
2. 3GPP. (2010). General packet radio system (GPRS) tunnelling protocol user plane (GTPv1-U). TS 29.281, 3rd generation partnership project (3GPP). http://www.3gpp.org/ftp/Specs/html-info/29281.htm . Accessed 12 Feb 2015.
3. 3GPP. (2011). Evolved universal terrestrial radio access network (E-UTRAN), S1 application protocol (S1AP). TS 36.413, 3rd generation partnership project (3GPP) (2011). http://www.3gpp.org/ftp/Specs/html-info/36413.htm . Accessed 12 Feb 2015.
4. 3GPP. (2011). Evolved universal terrestrial radio access network (E-UTRAN), X2 general aspects and principles. TS 36.420, 3rd generation partnership project (3GPP). http://www.3gpp.org/ftp/Specs/html-info/36420.htm . Accessed 12 Feb 2015.
5. 3GPP. (2011). Interworking between the public land mobile network (PLMN) supporting packet based services and packet data networks (pdn). ts 29.061, 3rd generation partnership project (3gpp). http://www.3gpp.org/ftp/specs/html-info/29061.htm . Accessed 12 Feb 2015.