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Let’s Crack the Interviews … Technically.
Here is the list of questions, you may be asked during the technical interview of LTE RF planning and optimization job.
- Tell us about LTE Frame Structure?
- What are the Bandwidths used for LTE deployment?
- How Many subcarriers/RBs are there in 5/10/20 MHz channel
- What is Subcarrier Bandwidth in LTE?
- How can we calculate LTE DL/UL throughput?
- What Maximum LTE throughput can be achieved in the field?
- How many states a UE can have ?
- What is difference between Idle & Connected Mode
- What is difference between HO , Redirection, Cell Selection / Re-Selection?
- What is RRC Reconfiguration?
- What is Difference between MIB and SIB?
- Message flow during LTE Call?
- Can you tell us about Prach/PCI/Pusch/Pucch Planning?
- Why does RRC Connection Reestablishment trigger?
- Handover types in LTE
- What is difference between X2 and S1 HO?
- Explain Handover signalling messages?
- Explain Events measurements in LTE
- What are main reasons of HO failures? how do you solve them?
- What is CIO? hysteresis?Time to trigger?
- What is MRO?
- Which event trigger during the reselection from LTE to 3G and vice versa
- What is ANR?
- What are the types of ANR? Which one is better?
- What is QCI?
- What is LTE modulation?AMC?
- What is MIMO?
- What is TM? TM1? TM2? TM3? TM4?
- What is close loop MIMO?
- Mapping of MIB and SIB messages?
- Explain SIB messages?
- What is purpose of SIB19?
- What information PDCCH carries?
- What are DCI formats? Which DCI format used for Uplink allocation?
- Explain Resource allocation to PDCCH? What is CCE ?
- What does Aggregation Level mean ?
- Why do we need multiple aggregation levels?
- How EnodeB decides the Aggregation Level to use?
- What Message will be observed on layer-3 During handover stage?
- Which channel carries CQI information to enodB?
- What other info PUCCH carries?
- What is DRX?
- What is UE disconnection Timer?
- What is the Location of PUCCH in the UL Spectrum?
- CS Fall back criteria and event?
- Explain CSFallback signalling?
- What basic parameters are required from Planning to configure a site?
- Explain PCI (Physical Cell id) Planning?
- How do you deal with Interference issues during PCI planning
- How do we do optimization of site?
- What are the Features available to improve accessibility, retainability?
- How does TA work in LTE?
- What is BLER? What’s Target value?
- How to investigate low throughput?
- What major KPIs have you been analyzing most?
- What do you know about LTE-A?
- What is carrier aggregation? Types of CA?
- What CA configuration? CA bandwidth class?
- What are PCC and SCC?
- what is difference between CSFB and VoLTE?
- Can you explain VoLTE call flow?
- How do you take care of VoLTE DCR?
- What QCIs are used for VoLTE?
- What is IMS? IMS Signalling?
- Does QCI1 and QCI5 setup simulateniously in VoLTE?
- Why QCI 9 and QCI 5 are always established and deactivated together?
- what is Semi-Persistent Scheduling (SPS) ?
- what is TTI Bundling?
- What is ROHC?
- What is SRVCC?
- what are the main issues you have faced in VoLTE? how do you solvethem?
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