"Protocol Testing engineers is one who does the following activity on 2G/3G/LTE/5G technologies;
Modem/UE Protocol Stack Testing
Interoperability testing of the modem with various Network operators and dealing with NEM labs (Ericsson, Nokia, alcatel Lucent)
Ability to understand network scenario (signaling & user plane call flow), develop test plans and test cases, and execute those test cases using an automation framework. Collects the required log and analysis/debug issues being found as part of regression.
Should be proficient in all 3GPP Radio Access Technologies (RAT) with air interface, network signaling and Layer 2, Layer 3 protocols of UE & RAN side, also NAS layer from UE and core network.
Automation using PERL/Python/TTCN scripting languages "
Platforms- Internal and customer specific platforms Linux host
Technology Standard- 3GPP specifications Thorough understanding of the Network vendor tests
Tools-
"QXDM, QCAT, QPST, Prism, Anritsu, keysight Test instrument knowledge,
Test scripting like RTD (for Anritsu) or equivalent Trace/log collection tools, core dump analysis tools, flashing tools "
Languages-
Scripting languages like Shell scripts, TCL scripts, Python, Perl etc.. C, C++, TTCN
Specialization- 2G, 3G, 4G, 5G, INTEROP TESTING, VSAT-SATCOM