Airtel Business RF Engineer Interview: Rounds, Questions and Preparation

What the job involves

An RF Engineer in telecom and internet plans, designs, optimises and troubleshoots radio frequency networks that deliver mobile and fixed wireless services to customers. Day to day work includes drive tests, site surveys, parameter tuning, interference analysis and capacity planning for 4G and 5G deployments. At an enterprise-focused provider like Airtel Business, the role also supports private networks, IoT connectivity and leased-line RF links for business customers.

Role and Technical Knowledge

1. 1

   Explain the difference between RSRP, RSRQ and SINR in LTE. Which one best indicates coverage and which one indicates quality?

   RSRP indicates signal strength or coverage, RSRQ reflects quality considering interference and load, and SINR is the clearest indicator of signal quality and throughput potential. A strong answer links each metric to a practical optimisation decision.

2. 2

   What is a link budget in RF planning? List the main parameters you would include for a 5G NR link.

   Cover transmit power, antenna gains, cable and connector losses, path loss, shadow margin, interference margin and receiver sensitivity. Mention that the link budget ensures the received signal meets the required threshold for the target data rate.

3. 3

   Describe the key differences between 4G LTE and 5G NR in terms of frame structure, subcarrier spacing and use of spectrum.

   Mention flexible numerology, wider channel bandwidths, mmWave and sub-6 GHz bands, massive MIMO and beamforming. Also note that 5G supports both standalone and non-standalone deployments.

4. 4

   What are the common causes of call drops and poor throughput in a live cellular network? How would you investigate them?

   List coverage holes, interference, handover failures, congestion and parameter misconfiguration. Explain a structured approach: check KPIs, run drive tests, analyse logs, identify root cause and propose parameter or physical changes.

Practical Scenarios and Field Work

1. 5

   You are given drive test logs showing low SINR in a dense urban area but good RSRP. What could be the reason and what steps would you take?

   Good RSRP with low SINR points to interference or pilot pollution. Suggest checking neighbour cell overlaps, antenna tilts, power settings and possibly adding a new site or adjusting azimuths. Mention using tools like TEMS or Nemo for log analysis.

2. 6

   A business customer in a warehouse reports frequent video call drops on their private LTE network. How would you troubleshoot this?

   Start by checking coverage inside the warehouse, interference from metal racks, capacity and handover boundaries. Propose solutions like indoor small cells, DAS, antenna repositioning or parameter tuning for better mobility.

3. 7

   Explain how you would plan RF coverage for a new 5G site in a semi-urban area. What data would you collect and what tools would you use?

   Mention site survey, clutter and terrain data, population and traffic density, and use of planning tools like Atoll or Planet. Discuss site selection, antenna height, tilt, and simulation of coverage and capacity.

4. 8

   What is the difference between a drive test and a walk test? When would you use each?

   Drive tests cover outdoor mobility and handovers, while walk tests focus on indoor or pedestrian areas. Mention that walk tests are useful for in-building coverage, malls and enterprise campuses.

Behavioural and Situational Questions

1. 9

   Tell me about a time you had to learn a new technical concept quickly for a project or exam. How did you approach it?

   Use the STAR method. Highlight self-study, online courses, lab practice or mentorship. Show curiosity and ability to apply the new concept to a real problem.

2. 10

   Describe a situation where you worked in a team to solve a problem. What was your role?

   Focus on collaboration, clear communication and shared goals. Mention any conflict resolution or how you divided tasks. Relate it to a college project, internship or hackathon.

3. 11

   This role may require travel to sites and working in field conditions. How do you feel about that?

   Show enthusiasm and adaptability. Mention any prior field visits, treks or internships that involved outdoor work. Emphasise that you understand the importance of ground-level data collection.

4. 12

   Why do you want to work as an RF Engineer in the telecom and internet sector, especially with enterprise customers?

   Connect your interest in wireless technology to the growing demand for connectivity in businesses. Mention 5G, IoT and private networks. Show that you understand the sector's impact on India's digital growth.

HR and Company Fit

1. 13

   What do you know about our company's business in telecom and internet?

   Research the company's services like broadband, enterprise connectivity, data centres and 5G rollouts. Mention any recent news or initiatives relevant to RF engineering.

2. 14

   Where do you see yourself in three years as an RF Engineer?

   Show a clear growth path: from field optimisation to planning, then to network design or specialist roles in 5G. Mention certifications or skills you plan to acquire.

3. 15

   Are you comfortable working in shifts or being on call for network emergencies?

   Be honest but positive. If you are flexible, say so and give an example of handling pressure or odd hours during college projects or internships.

4. 16

   Do you have any questions for us?

   Ask about the team structure, tools used, training programmes or typical career progression for RF engineers. Avoid questions about salary at this stage unless prompted.