5G NR Resource Grid

Downlink Numerology & BWP aware μ = 0–4 SSB · CORESET/PDCCH · PDSCH · DMRS · CSI-RS

A configuration explorer for the NR downlink: pick a numerology, bandwidth part and a few channels, and the grid re-renders every resource element from the 3GPP mapping rules. Hover any RE to inspect it. Companion to the 4G LTE resource grid.

3GPP release & assumptions

Release: formulas and tables follow 3GPP Release 17 (TS 38.211, 38.213, 38.214, 38.331). Values are stable across Rel-15..18 for everything implemented here.

• SSB — synchronization signal block with PSS, SSS and PBCH in a half-frame burst pattern (TS 38.213 §4.1).
• CORESET / PDCCH — control resource set and physical downlink control channel mapped in CCEs from REG bundles (TS 38.211 §7.3).
• PDSCH — RB allocation within the BWP; data REs are rate-matched around SSB, CORESET/PDCCH, CSI-RS and DM-RS (TS 38.214 §5.1.4).
• CSI-RS — all 18 rows of Table 7.4.1.5.3-1; ZP-CSI-RS shown as reserved REs.
• Not modelled: PT-RS, PUCCH/PRACH, multi-BWP switching, DCI-driven dynamic grants, full frequencyDomainAllocation bitmaps (CSI-RS row 1 uses RB offset mod 3).

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Configuration

Live

Numerology & carrier

Numerology μSCS = 15·2^μ kHz (TS 38.211 §4.2)

μ=0 · 15 kHz μ=1 · 30 kHz μ=2 · 60 kHz μ=3 · 120 kHz μ=4 · 240 kHz

Cyclic prefix

Normal (14 sym/slot) Extended (12 sym/slot)

Carrier bandwidth (N_grid)resource blocks (TS 38.211 Table 4.4.2-1)

24 RB 48 RB 51 RB 106 RB 133 RB 273 RB

offsetToPointA / N_start,gridCRB of the lowest carrier RB (TS 38.211 §4.4.4.2)

CRB

Physical cell ID (0–1007)derives DMRS shifts (PSS/SSS)

Bandwidth part (BWP)

BWP start (RB, relative to carrier)

BWP size (RB)

Duplex & slot format

Duplex mode

FDD (all downlink) TDD (slot format)

TDD slot format (0–55)D/U/F per symbol (TS 38.213 Table 11.1.1-1)

SS/PBCH block (SSB)

SSB case / SCStime pattern (TS 38.213 §4.1)

Case A · 15 kHz Case B · 30 kHz Case C · 30 kHz Case D · 120 kHz Case E · 240 kHz

L_max (SSBs per burst)

4 (f ≤ 3 GHz) 8 (FR1 3–6 GHz) 64 (FR2)

SSB lowest RB (CRB of SSB RB 0)

k_SSB (ssb-SubcarrierOffset)

CORESET / PDCCH

Start symbol / duration1–3 symbols (TS 38.211 §7.3.2.2)

len 1 2 3

Frequency (RB, relative to BWP)

× RB

CCE-to-REG mapping

Non-interleaved Interleaved L 2 3 6

Highlight PDCCH candidateaggregation level × first CCE

none AL 1 AL 2 AL 4 AL 8 AL 16 @CCE

Slot periodicity / offsetmonitoring pattern (TS 38.213 §10)

period offset

PDSCH / DMRS

Mapping type / start / lengthSLIV (TS 38.214 §5.1.2.1)

Type A Type B S L

DMRS config type / add. positions

Type 1 (comb-2) Type 2 add pos0 pos1 pos2 pos3

RB allocation (within BWP)frequency resource assignment (TS 38.214 §5.1.2.2)

start × RB

Slot periodicity / offset

period offset

dmrs-TypeA-Position / CDM groups w/o data

pos2 pos3 CDM 1 2 3

CSI-RS

Row (Table 7.4.1.5.3-1)

Row 1 · 1p · density 3 Row 2 · 1p · density 1 Row 3 · 2p · FD-CDM2 Row 4 · 4p · FD-CDM2 Row 5 · 4p · FD-CDM2 Row 6 · 8p · FD-CDM2 Row 7 · 8p · CDM4 Row 8 · 8p · CDM4 Row 9 · 12p · noCDM Row 10 · 12p · CDM4 Row 11 · 16p · FD-CDM2 Row 12 · 16p · CDM4 Row 13 · 24p · noCDM Row 14 · 24p · CDM4 Row 15 · 24p · CDM8 Row 16 · 32p · FD-CDM2 Row 17 · 32p · CDM4 Row 18 · 32p · CDM8 ZP

First symbol l0 / subcarrier k0 (in RB)

l0 k0 dens off

Slot periodicity / offset

period offset

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Resource Grid

Downlink · Live

View span:

Slot Subframe Frame

Zoom: 100%

Hover over any resource element to inspect its channel, CRB/PRB, subcarrier, symbol & slot

About the 5G NR downlink resource grid

The NR downlink physical resource grid is a time–frequency lattice of resource elements (REs), grouped into physical resource blocks (PRBs) of 12 subcarriers × 1 slot. Unlike LTE, NR supports flexible numerologies (subcarrier spacing 15–240 kHz) and bandwidth parts (BWPs). This tool draws the grid live from your configuration.

NR downlink channels on the grid

SSB

Synchronization signal block — PSS, SSS and PBCH for cell search and MIB delivery in a configurable half-frame burst.

CORESET

Control resource set — a time–frequency region where PDCCH is mapped, defined by duration, frequency domain and CCE-to-REG mapping.

PDCCH

Physical downlink control channel — carries DCI scheduling grants in CCEs built from REG bundles within a CORESET.

PDSCH

Physical downlink shared channel — user data in the remaining available REs within the active BWP.

DM-RS

Demodulation reference signals for PDSCH and PDCCH channel estimation, mapped per antenna port and CDM group.

CSI-RS

Channel state information reference signals for beam management and CSI feedback (all 18 3GPP row configurations).

Configurable parameters

Adjust numerology (μ), cyclic prefix, carrier bandwidth, BWP location, SSB burst pattern, CORESET/PDCCH search space, PDSCH allocation and CSI-RS row. The grid updates instantly and supports shareable links to any configuration. For 4G LTE, see the companion 4G LTE resource grid tool.