RF5G NR DCI Formats: A Detailed Overview
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This document provides a detailed explanation of 5G NR DCI (Downlink Control Information) formats, outlining their functions and the fields they utilize. We will explore formats such as 0_0, 0_1, 1_0, 1_1, 2_0, 2_1, 2_2, and 2_3.
Introduction to DCI
DCI, short for Downlink Control Information, serves as a crucial mechanism for transporting downlink control information to one or more cells using a specific RNTI (Radio Network Temporary Identifier).
The process of encoding DCI involves several key steps:
- Information Element multiplexing
- CRC (Cyclic Redundancy Check) attachment
- Channel coding
- Rate matching
The following table summarizes the functions of various DCI format types as defined in 3GPP TS 38.212 V15, published in June 2018. The function of DCI in 5G NR is conceptually similar to that in LTE, primarily used for scheduling PUSCH (Physical Uplink Shared Channel) and PDSCH (Physical Downlink Shared Channel).
5G NR DCI Format Types and Their Usage
| 5G NR DCI Format Type | Usage Description |
|---|---|
| Format 0_0 | Scheduling of PUSCH in one cell |
| Format 0_1 | Scheduling of PUSCH in one cell |
| Format 1_0 | Scheduling of PDSCH in one cell |
| Format 1_1 | Scheduling of PDSCH in one cell |
| Format 2_0 | Notifying a group of UEs (User Equipments) of the slot format. |
| Format 2_1 | Notifying a group of UEs of the PRB(s) (Physical Resource Blocks) and OFDM symbol(s) where UE may assume no transmission is intended for the UE. |
| Format 2_2 | Transmission of TPC (Transmit Power Control) commands for PUCCH (Physical Uplink Control Channel) and PUSCH. |
| Format 2_3 | Transmission of a group of TPC commands for SRS (Sounding Reference Signal) transmissions by one or more UEs. |
Exploring 5G NR DCI Formats
You can further explore each specific 5G NR DCI format, including 0_0, 0_1, 1_0, 1_1, 2_0, 2_1, 2_2, and 2_3, to understand their individual fields and functionalities in greater detail.
5G NR Reference Documents
- 3GPP TS 38.212
- 3GPP TS 38.213
- 3GPP TS 38.214
