Day: March 18, 2019

3GPP Release 13

March 18, 2019

3GPP Release 13 first release was frozen in March 2016. It was brought to reality with a quite extensive set of new functionalities as compared to LTE-Advanced. They are summarized below. LTE in unlicensed spectrum Carrier Aggregation enhancements LTE enhancements for Machine-Type Communications (MTC) Enhancements for D2D Elevation Beamforming / Full-Dimension MIMO Indoor positioning Single-cell Point-to-Multipoint […]

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3GPP Release 14

March 18, 2019

The 3GPP RAN group has started working on the evolution of LTE  in  3GPP Release 14, targeting completion by June 2017. This release targeting improvement and new features for LTE-Advanced Pro. As short List of the new feature is given below Improvement to LTE efficiency – Downlink Multi user Superposition Transmission – Enhancements on FD-MIMO – […]

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3GPP Release 15

March 18, 2019

In parallel to LTE evolution, Release 13 and Release 14 work already started. 3GPP Release-14 was focused mainly on 5G study items and the first phase of 5G system specification just started within 3GPP Release 15 targeted to be completed by September 2018.  3GPP Release 15 is capturing LTE enhancements features and 5G aspects and listed […]

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LTE Layer 1 (Physical Layer) Interview Questions

March 18, 2019

What is the smallest time measurement unit Ts in LTE? Show the calculation. How many Ts are there in 1 subframe? In normal cyclic prefix, what is the length of the 0th and 1st symbol CP in Terms of Ts? How is the length of total time if all 7 CPs are added together in […]

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LTE Layer 2 (MAC,RLC,PDCP) Interview Questions

March 18, 2019

What is the DRX and DRX active period? What channels does it monitor inactive period? What is MAC-ContentionResolutionTimer – What is the start and end activity? What is the HARQ RTT Timer? What is the msg3 buffer? What is the PRACH Resource Index? What is ra-PRACH-MaskIndex? What are the Logical Channels carried through HARQ? What […]

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LTE Layer 3 (RRC Layer) Interview Questions

March 18, 2019

What is the difference between Acceptable, Suitable and Reserved Cell? How is a state “Camped on Any Cell” different from “Any Cell Selection” state? What are CSG cell and CSG whitelist? Differentiate HPLMN, EHPLMN, RPLMN. What is Hybrid Cell? What is the difference between Serving Cell and Primary Cell? How many Maximum Serving Cell can […]

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