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Tool
3GPP TS 38.211
5G NR resource grid explorer
Interactive visualization of 5G NR frame structure and time-frequency resource allocation.
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Reference information
5G NR resource grid
The resource grid is the fundamental structure for mapping physical channels and signals in 5G NR. It consists of resource elements (RE) arranged in time (OFDM symbols) and frequency (subcarriers). A Physical Resource Block (PRB) contains 12 consecutive subcarriers in frequency and one slot in time.
Key parameters
- Resource element (RE): One subcarrier × one OFDM symbol (smallest unit)
- Resource block (RB): 12 subcarriers × 14 symbols (normal CP) = 168 REs
- Subcarrier spacing: 15 × 2^μ kHz, where μ is the numerology (0-4)
- Slot duration: 1 / (2^μ) ms for normal CP
Channel mappings
- PDSCH: Physical Downlink Shared Channel - user data transmission
- DM-RS: Demodulation Reference Signals - channel estimation for PDSCH
- SS/PBCH: Synchronization Signal and Physical Broadcast Channel - cell acquisition
3GPP references
- TS 38.211 Section 4.4: Resource grid definition
- TS 38.211 Section 7: Physical channels and signals
- TS 38.213: Physical layer procedures for control
- TS 38.104 Table 5.3.2-1: Maximum transmission bandwidth configuration
Note: This tool provides a simplified visualization of the resource grid. Actual deployments may include additional channels (PDCCH, PUCCH, CSI-RS, etc.) and more complex allocation patterns.