We have updated the 3GPP/LTE ASN.1 API’s we have available for use with ASN1C. These API’s are extended sample programs that contain the complete ASN.1 specifications extracted from the relevant 3GPP standard documents. The API’s are available at the following URL ("LTE ASN.1 APIs" tab):
http://www.obj-sys.com/lte_3gpp_apis.php
There are API’s available for 3GPP releases 8 through 14 (12 through 14 for M2AP and M3AP) of the different specification types. API’s are currently available for the LTE-RRC, S1AP, X2AP, M2AP, and M3AP LTE ASN.1 specifications.