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How to Crack 5G Protocol Testing Interview ?

Updated: Aug 6, 2023

What is 5G Protocol Testing ?


5G Protocol Testing is the process of verifying and validating the compliance and functionality of 5G network components and devices to the 5G standards and specifications. This includes testing the various protocols involved in 5G communication such as LTE, NR, 5GC, N1, N2, N3 and ensuring their proper implementation in the network, inter-working between network elements, and testing the overall performance and reliability of the 5G network. The aim of 5G protocol testing is to guarantee that the 5G network meets the desired quality, security and performance requirements for end-users.




If You want to clear 5G Protocol Testing Interview You need to have in depth knowledge of

  1. 5G UE Power on Scenario (UE Protocol Initialization).

  2. CALL Flow

  3. NAS, RRC, SDAP Protocols

  4. PDCP RLC MAC Protocols

  5. PBCH, PHICH, PCFICH, PDCCH, PDSCH PUCCH, PUSCH in detail.

  6. Numerology, Bandwidth Part, CORESET

  7. RACH Process

  8. DRX, BSR, PHR in detail.

  9. Default and Dedicated Bearers (QOS in Details)

  10. Idle and Dedicated Mode Mobility (Cell Selection, Reselection and Handover).


Questions Related to 5G Protocol Testing Interview ?

Here are some common questions that you might encounter in a 5G Protocol Testing interview:

  1. What do you mean by connected mode DRX?

  2. Why our first carrier in LTE is 1.4 MHz? Why not 1 MHz ?

  3. What is A3 and B2 Events ?

  4. Explain RACH process.

  5. What is semi persistence scheduling in LTE?

  6. Explain Call flow.

  7. Why PSS and SSS are mapped to 7th and 6th symbol in RB?

  8. What are information elements of RRC Connection Setup?

  9. What is Backoff Indicator?

  10. What do you mean by PHR?

  11. Does C-RNTI works on Control Plane and User Plane both ?

  12. Tell me the latest Bug you had found?

  13. What is T-301 timer?

  14. Why we are not using Extended Cyclic prefix in our network?

  15. Why we don’t have PDCP layer functions involved till RRC Connection setup?

  16. What is T_POLLRETRANSMIT and T_REORDERING ?

  17. What is RF Calibration? Why need of RF Calibration for DUT after Flash?

  18. How many types of Flashing? How you’ll do Flash a Device?

  19. Name of Flash Tool you’re using in your lab?

  20. What is BSR?

  21. How many APN will be assigned to UE at initial attach?

  22. Can you explain the 5G network architecture and the various protocols involved in 5G communication?

  23. How does 5G differ from previous generations of mobile networks in terms of testing requirements and challenges?

  24. Can you describe your experience in testing 5G network components and devices, such as 5G NR modems, 5GC nodes, and 5G gNodeBs?

  25. Can you discuss the steps involved in testing the inter-working between 5G network elements, such as 5GC, N1, N2, N3 interfaces?

  26. How do you ensure the performance and reliability of a 5G network, and what performance metrics do you use to measure it?

  27. Can you explain the role of simulation and emulation in 5G protocol testing, and how do you decide which method to use in a given scenario?

  28. How do you handle end-to-end testing in a 5G network, and what challenges do you face in testing the complete system?

  29. Can you discuss your experience in using 5G testing tools, such as protocol analyzers, network simulators, and test automation frameworks?

  30. Can you give an example of a complex 5G protocol testing issue that you encountered and how you solved it?

  31. How do you keep up-to-date with the latest developments and trends in 5G technology and testing, and what resources do you use for learning and professional development?

How to Pass 5G Protocol Testing Interview ?


To pass a 5G Protocol Testing interview, you should:

  1. Study the 5G standards and specifications thoroughly, such as 3GPP 5G NR, 5GC, N1, N2, N3, and understand the underlying technologies and protocols involved in 5G communication.

  2. Acquire hands-on experience in 5G testing tools, methodologies, and processes, such as simulation, emulation, and over-the-air testing.

  3. Be familiar with 5G use cases and deployment scenarios, and understand the requirements and challenges of 5G network testing in different environments.

  4. Have a good understanding of 5G testing objectives and objectives, such as end-to-end testing, interoperability testing, and performance testing.

  5. Stay up-to-date with the latest developments and trends in 5G technology, testing and industry, and be able to articulate your thoughts and ideas clearly and effectively during the interview.

  6. Be prepared to answer questions on various aspects of 5G testing, such as test planning, test cases, test execution, test reporting, and test automation.

  7. Showcase your problem-solving skills and ability to work in a team, as well as your communication and interpersonal skills.

Overall, demonstrating your technical expertise, experience, and passion for 5G protocol testing can help you stand out and make a positive impression during the interview.


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