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3GPP TS 38.211 / TS 38.213 Rel-17 Standards Mapper

5G NR RE Grid & Channel Mapper

Interactive 5G NR resource grid mapper with 3GPP TS 38.213 advanced TDD slot & symbol configuration.

Duplex & Carrier Controls
3GPP TS 38.213 TDD Slot & Symbol Pattern ConfigurationPeriodicity: 10 Slots
SCS Numerology
Visible Carrier PRBs
PDSCH Data & DMRS
PUSCH Data & DMRS
PUCCH Control
Grid Viewport (TDD Mode) | Slot #0 (DL) | 24 PRBs (288 Subcarriers × 14 Symbols)
Viewport Zoom:120%
Channel Legend:
PDCCH / CORESET
PDSCH DM-RS
PDSCH Data
PUSCH Data
PUSCH DM-RS
PUCCH
SSB PSS
SSB SSS
SSB PBCH
Collision
10-Slot Frame Window Navigator (Slots #0 to #9)
Selected RE Inspector
Click any Resource Element (RE) on the grid canvas to inspect coordinates, ownership, and 3GPP citations.
RE Accounting Breakdown
PDSCH / PUSCH Data REs2,112
DM-RS REs (DL/UL)144
Control REs (PDCCH/PUCCH)576
SSB REs960
CSI-RS REs48
N_RE per PRB (Active Data Channel):88.0 REs
Frequently Asked Questions: 5G NR Resource Grid & Channel Allocation

01What is SSB symbol rate-matching and why is it critical?

  • SSB Footprint (TS 38.211 Sec 7.4.3.1): An SS/PBCH Block spans 20 PRBs (240 subcarriers) across 4 consecutive OFDM symbols.
  • SSB Component Signals: Contains PSS (Symbol 0), SSS (Symbol 2), PBCH data (Symbols 1–3), and PBCH DM-RS.
  • Rate-Matching Action: When SSB Rate-Matching is ON, gNodeBs route PDSCH data around SSB symbols to prevent fatal collisions.
  • Collision Mode: When Rate-Matching is OFF, data overlapping SSB turns red (COLLISION) to visualize spec violations.

02What do K0, K1, and K2 time-domain slot offsets represent?

  • K0 (PDCCH DCI → PDSCH): Slot offset for Downlink data. PDSCH is transmitted in slot n + K0 relative to DCI slot n (TS 38.214 Table 5.1.2.1.1-1).
  • K1 (PDSCH → PUCCH HARQ): Slot offset for HARQ-ACK feedback. PUCCH transmits ACK/NACK in slot n + K1 following PDSCH slot n.
  • K2 (PDCCH DCI → PUSCH): Slot offset for Uplink data grants. PUSCH is transmitted in slot n + K2 relative to UL Grant DCI slot n.

03How are Scheduling Request (SR) parameters configured in RRC/MAC?

  • SR Periodicity (periodicityAndOffset): Defines slot intervals (sl1 to sl80) where a UE can send an SR on PUCCH Format 0/1.
  • sr-ProhibitTimer: Minimum timer (1ms to 128ms) preventing back-to-back SR flooding (TS 38.321).
  • sr-TransMax: Max SR retransmissions (n4 to n64) before resetting MAC and initiating RACH procedure.
  • phy-PriorityIndex (Rel-16): Priority levels (p0 for Best Effort vs p1 for Ultra-Reliable Low-Latency URLLC).

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