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5G NR Coreset

In this chapter we shall learn about 5G NR CORESET. CORESET stands for Control Resource Set. It is used to decode PDCCH. WKT UE needs to decode PDCCH and get the DCI info carried by PDCCH. Otherwise UE will never know the DL/UL grants for PDCCH …

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5G NR Reference Signals

Reference Signals are for Phy layer only. In 5G NR Reference signals are used for both downlink and uplink. There are 4 different types of reference signals in 5G: 1. DM-RS: Demodulation Reference Signal 2. PT-RS: Phase Tracking Reference Signal 3. STS: Sounding Reference Signal 4. …

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5G NR Channels

5G NR Downlink Channels 5G NR Uplink Channels There are 3 different types of channels: 1. Logical Channels > Logical Channels are between RLC and MAC layer. > It is defined by the type of information it carries and is classified into control channel and traffic …

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5G NR DCI formats Introduction

DCI stands for Downlink Control Information. It is used to carry downlink control information for one or more cells with one RNTI. It also provides the UE with necessary information such as physical layer resource allocation, power control commands, HARQ information for both uplink and downlink. …

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5G Resource Grid and Resource Block

5G Resource Grid: A 5G Resource Grid is defined by one subframe (1ms) in time domain and full carrier bandwidth in frequency domain. Example: Consider below parameters: Channel Bandwidth = 50MHz Sub Carrier Spacing = 30MHz Guard Band = 692.5KHz. First we will calculate number of …

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5G NR Numerology and Sub Carrier Spacing (SCS)

Before we understand 5G frame structure, let us look at the below diagram: From the above image we can see that, each frame will have number of sub frames. A sub frame can have number of slots. Each slots can have a number of symbols (7 …

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5G NR Air Interface Introduction

In this chapter we shall have a look at the important concepts that are required to understand 5G air interface. 5G will operate on 2 different frequencies. Frequency Range 1 (FR1): 450 MHz to 7.125 GHz Frequency Range 2 (FR2): 24.25 GHz to 52.6 GHz Low …

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5G NR MAC PDU for RACH

In this chapter we shall see in detail of 5G NR MAC PDU for RACH. After sending Msg1, UE will monitor PDCCH window and then PDCCH will indicate the location of PDSCH and PDSCH will contain RAR. Msg2 is a RAR message. We will discuss MAC …

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5G NR MAC Sub Headers, MAC PDU and MAC Control Elements

Difference between 5G NR MAC PDU and LTE MAC PDU: From the above image we can infer below points: 1. A MAC PDU in LTE has a single header that has all the information for decoding the entire PDU. 2. A MAC PDU in 5G NR …

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5G NR MAC Layer Introduction

5G NR Protocol stack is divided into 2 planes: User Plane and Control Plane. User Plane is used to transfer user data and control plane is used to transfer system control signalling transmission. 5G NR User Plane Protocol Stack 5G NR Control Plane Protocol Stack MAC …

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