"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