Important Links for LTE

This is where you can download all 3GPP specification for LTE
http://www.3gpp.org/ftp/Specs/html-info/36-series.htm

This is where you can download the TTCN source code
http://www.3gpp.org/ftp/tsg_ran/WG5_Test_ex-T1/TTCN/Deliveries/LTE_SAE/

You can download free TTCN-3 Viewer
http://www.eu.anritsu.com/ttcn