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Category: 5G Physical Layer

5G NR BFR – Beam Failure Recovery

The 5G communication specially at higher frequencies or mmWave is using Massive MIMO with Beamforming. Beamforming is a signal processing technique that allows gNB send targeted beams of data to […]

July 21, 2021July 22, 2021 Author 3GPP Specification, 5G, 5G Call Flow, 5G MAC Layer, 5G Physical Layer

5G NR Downlink HARQ Codebook

In 5G NR, 3GPP specification has defined HARQ Codebook  to provide the feedback to base station for Downlink data transmission i.e., PDSCH Data. UE Sends the ACK/NACK for corresponding PDSCH […]

May 24, 2021October 4, 2021 Author 3GPP Specification, 5G, 5G NR, 5G Physical Layer

5G NR SSB Positioning – Time and Frequency Resources

In 5G NR, Synchronization Signal Block (SSB) includes PSS, SSS and PBCH and its location compared to LTE is completed different. In LTE, Sync signal position is  straight forward located […]

January 31, 2021January 31, 2021 Author 5G, 5G Network Architectures, 5G NR, 5G Physical Layer, Interviews, Tech Fundas

5G NR SS-RSRP Value Measurement Mapping

UE does measurement of SS-RSRP and use it for cell selection, cell reselection, power control, mobility procedures and beam management procedures. RSRP measurement generated and reported at both Layer 1 […]

January 10, 2021August 28, 2021 Author 5G, 5G Physical Layer, RRC Signalling, Tech Fundas

5G NR Numerology – Subcarrier Spcaing (SCS)

In LTE, there is only type of numerology or subcarrier spacing (15 KHz), whereas in NR, multiple types of subcarrier spacing are available e.g 5G NR supports subcarrier spacing of […]

September 20, 2020October 2, 2021 Author 5G, 5G NR, 5G Physical Layer, Open RAN, RF Basics, RRC Signalling, Tech Fundas

3GPP Evolution for MIMO

Released 3GPP standards on MIMO are shown in below image. As you know, Coordinated Multipoint (CoMP) is a type of Cooperative MIMO, in which data and channel state information (CSI) are […]

September 20, 2020November 5, 2020 Author 3GPP Specification, 5G, 5G Network Planning, 5G NR, 5G Physical Layer, NR, RF Optimisation

5G NR Transport Block Size (TBS) Calculation

Transport Block  in 5G NR, is nothing but the payload which is passed between the MAC and Phy Layers, specifically for the shared data channel such as PDSCH and PUSCH. […]

August 16, 2020August 16, 2020 Author 3GPP Specification, 5G MAC Layer, 5G NR, 5G Physical Layer

5G NR RACH Procedure Overview – CBRA & CFRA

When we want to connect a UE to 5G network, it has to synchronize in downlink as well as in uplink. Downlink synchronization is obtained after successfully decoding SSB, In […]

August 5, 2020June 19, 2022 Author 5G, 5G MAC, 5G Network Planning, 5G NR, 5G NR Standalone, 5G Physical Layer, Tech Fundas

5G NR Modulation and Coding Scheme – Modulation and Code Rate

For any communication technology, Modulation and Coding Scheme (MCS) defines the numbers of useful bits which can carried by one symbol. In contrast with 5G or 4G, a symbol is […]

July 14, 2020July 14, 2020 Author 5G, 5G Network Architectures, 5G Network Planning, 5G NR Standalone, 5G Physical Layer, Interviews, Wireless Testing

5G NR RA-RNTI Calculation

A 5G UE picks a random preamble for RACH procedure to get the uplink synchronisation. The preamble is referenced with an ID know as  RAPID (Random Access Preamble ID). 5G […]

June 25, 2020July 21, 2020 Author 5G, 5G MAC Layer, 5G Physical Layer, Call Flow, NR, Signaling

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