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Category: 5G MAC Layer

5G NR SR – Scheduling Request

Introduction SR also known as Scheduling Request is a very famous word for telecom Dev, Test, and Optimization Engineers. It is a Layer 1 (Physical Layer) signal or message sent […]

August 6, 2022August 6, 2022 Author 5G, 5G MAC, 5G MAC Layer, 5G Physical Layer, Call Flow

5G MSG3 – PUSCH Scheduled Transmission by RAR UL grant

Introduction 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, […]

June 24, 2022June 24, 2022 Author 5G, 5G MAC, 5G MAC Layer, 5G NR, Interviews

Radio Link Monitoring in 5G – RLM

Introduction When a UE  is connected to the network, it requires to continuously monitor the Radio link for reliable communication, the process is know as Radio Link Monitoring (RLM). The […]

June 6, 2022June 6, 2022 Author 5G, 5G MAC Layer, 5G NR, 5G Physical Layer, RF Optimisation, RRC Signalling

5G MAC BSR – Buffer Status Reporting

The Buffer Status reporting (BSR) is a MAC layer procedure which is used by the UE to provide information about the amount of data available for transmission in the UL […]

August 15, 2021August 16, 2021 Author 3GPP Specification, 5G, 5G Call Flow, 5G MAC, 5G MAC Layer, Tech Fundas

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

5GNR 2-Step RACH

In Earlier versions of NR  3GPP Releases i.e. Rel.15, There was only one type of RACH procedure was defined, which is similar to LTE RACH procedure also known as 4-Step […]

April 8, 2021July 21, 2021 Author 5G, 5G Call Flow, 5G MAC, 5G MAC Layer, Tech Fundas

5G NR PRACH Power Control: MSG1 Tx Power – Open Loop Power

In any wireless System, when a device (UE) needs to get access  it has to send a signal or preamble (MSG1) to base station (gNB), then energy is needed. One […]

February 20, 2021February 21, 2021 Author 3GPP Specification, 5G, 5G MAC Layer, Interviews

5G NR Timing Advance: RAR TA and MAC-CE TA

Timing Advance (TA) is a command sent by Base Station (BS) to UE to adjust its uplink transmission means that the UE sends UL symbols in advance according to command […]

December 23, 2020January 1, 2021 Author 5G, 5G MAC Layer

5G NR Layer 2 – Radio Link Control (RLC) Overview

5G RLC overall functionality is almost same as LTE RLC. In 5G also, RLC has 3 different modes of operations and each of the mode can transmit and receive data, […]

October 13, 2020October 21, 2020 Author 5G, 5G MAC Layer, 5G NR, NR

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

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