Bharti Hexacom RF Engineer Interview: Rounds, Questions and Preparation

What the job involves

RF Engineers in telecom and internet services plan, design, and optimise radio access networks (2G/3G/4G/5G) to deliver reliable coverage and capacity. Day to day they analyse drive test and KPIs, tune parameters, coordinate site surveys and integration, and troubleshoot interference or call drop issues. They work closely with planning, operations, and vendors to meet quality and rollout targets.

Role and Telecom Fundamentals

1. 1

   What does an RF Engineer do in a telecom operator like Bharti Hexacom?

   Cover RF planning, optimisation, site surveys, KPI monitoring, and coordination with operations and vendors. Mention that the goal is coverage, capacity, and quality.

2. 2

   Explain the difference between GSM, UMTS, LTE, and 5G NR in simple terms.

   Focus on multiple access (TDMA, CDMA, OFDMA), data speeds, latency, and use cases. Avoid deep protocol details unless asked.

3. 3

   What is a link budget and why is it important?

   Describe it as accounting for transmit power, gains, losses, and receiver sensitivity to estimate coverage. Mention its role in cell radius and site planning.

4. 4

   What are the key RF KPIs you would monitor for a live network?

   List RSRP, RSRQ, SINR, call drop rate, accessibility, retainability, and throughput. Explain what each indicates about network health.

Technical Knowledge and Tools

1. 5

   How does frequency reuse work in cellular networks?

   Explain reuse factor, co-channel interference, and capacity trade-offs. Mention sectorisation and fractional reuse in LTE.

2. 6

   What is the difference between RSSI, RSRP, and RSRQ?

   RSSI is total received power, RSRP is reference signal power, RSRQ is quality considering interference. Relate them to LTE measurements.

3. 7

   What tools have you used for RF planning or drive test analysis?

   Name any academic or project tools like Atoll, TEMS, or open-source simulators. Describe what you did with them, even in a college project.

4. 8

   What causes call drops and how would you troubleshoot them?

   Mention coverage holes, interference, handover failures, and capacity issues. Outline a process: check KPIs, drive test, parameter audit, then fix.

Practical Scenarios and Problem Solving

1. 9

   A site has good RSRP but poor SINR. What could be the reason and how would you improve it?

   Likely interference or pilot pollution. Suggest antenna tilt, power adjustment, PCI/PRACH planning, or adding a new site.

2. 10

   You need to improve coverage in a dense urban area with limited spectrum. What approach would you take?

   Consider small cells, DAS, higher order sectorisation, MIMO, and carrier aggregation. Balance cost and capacity.

3. 11

   How would you plan a new site from scratch?

   Cover site survey, candidate selection, propagation model, link budget, antenna configuration, and integration testing. Mention regulatory clearances.

4. 12

   What is the impact of antenna downtilt on coverage and interference?

   Downtilt reduces coverage footprint but lowers interference to neighbouring cells. Explain electrical vs mechanical tilt and use cases.

Behavioural and HR Questions

1. 13

   Tell me about a time you worked in a team to solve a technical problem.

   Use STAR method. Highlight your specific contribution, communication, and the outcome. Relate to a project or internship.

2. 14

   Are you willing to travel to remote sites and work in field conditions?

   Show enthusiasm and flexibility. Mention any past field visits or willingness to learn hands-on.

3. 15

   How do you prioritise when multiple sites have issues at the same time?

   Base priority on customer impact, severity, and business importance. Mention using data to decide and communicating clearly.

4. 16

   Why do you want to work as an RF Engineer in the telecom sector?

   Connect your interest in wireless technology and problem solving to the role. Show awareness of the sector's growth with 5G and IoT.