3GPPDecoder is a free open source decoder to decode wireless messages and PDUs(Protocol Data Units). The program currently supports Windows OS.
You can use 3GPPDecoder to decode 3GPP LTE, UMTS and GSM messages for RRC and NAS. Also it supports RLC (Radio Link Control) protocol PDU header decoding.
3GPPDecoder is developed using QT and main programming language is C++. To build the decoder program open the 3GPP Decoder.pro using QT Create and build it inside the environment.
Download the 3GPPDecoder executable from: 3GPP Decoder Installer