TS 38.213 §11.1
Defines the tdd-UL-DL-ConfigurationCommon and tdd-UL-DL-ConfigDedicated protocols used for semi-static RRC signaling.
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TS 38.213 Reference
5G NR TDD Configuration Tool (3GPP Compliant)
Analyze and calculate 3GPP-compliant 5G NR TDD slot formats and UL-DL configuration patterns. Professional engineering tool for radio frame structure analysis according to TS 38.213 specifications.
TDD UL-DL Configuration Parameters
Select a semi-static TDD pattern index to analyze its symbol and slot distribution for 5G NR.
Reference: TS 38.213 Table 11.1.1-1
TDD UL-DL Configuration Reference Matrix
Standardized semi-static TDD patterns from 3GPP TS 38.213 Table 11.1.1-1. These form the basis for massive MIMO synchronization and interference management.
| Index | Periodicity | DL Slots | DL Symbols | UL Slots | UL Symbols | |
|---|---|---|---|---|---|---|
| 0 | 0.5 ms | 0 | 2 | 0 | 12 | |
| 1 | 0.5 ms | 0 | 4 | 0 | 10 | |
| 2 | 0.5 ms | 0 | 6 | 0 | 8 | |
| 3 | 1 ms | 0 | 2 | 0 | 12 | |
| 4 | 1 ms | 0 | 4 | 0 | 10 | |
| 5 | 1 ms | 0 | 6 | 0 | 8 | |
| 6 | 1 ms | 0 | 8 | 0 | 6 | |
| 7 | 2 ms | 3 | 0 | 1 | 0 | |
| 8 | 2 ms | 7 | 0 | 1 | 0 | |
| 9 | 2.5 ms | 3 | 0 | 1 | 0 | |
| 10 | 2.5 ms | 4 | 0 | 1 | 0 | |
| 11 | 3 ms | 6 | 0 | 2 | 0 | |
| 12 | 4 ms | 3 | 0 | 1 | 0 | |
| 13 | 5 ms | 3 | 0 | 1 | 0 | |
| 14 | 5 ms | 7 | 0 | 2 | 0 | |
| 15 | 5 ms | 8 | 0 | 1 | 0 | |
| 16 | 10 ms | 7 | 6 | 2 | 4 | |
| 17 | 10 ms | 3 | 0 | 1 | 0 |
Pro Engineering Insights: 5G NR TDD Strategy
Interference & Guard Periods
The transition from DL to UL requires a Guard Period (GP) to prevent interference between base station transmissions and mobile uplink signals. In 5G NR, this is often handled by Flexible (F) symbols or idle time between slots.
"Proper TDD configuration is critical for Massive MIMO performance. A misalignment in slot patterns between neighboring cells can lead to high 'Remote Interference' (RI), crippling uplink throughput."
Switching Periodicity Selection
Low Latency (Sub-2ms)
Ideal for URLLC and high-speed gaming; requires higher signaling overhead.
Balanced (5ms)
Commonly used in outdoor macro networks (e.g., n78) for solid coverage and throughput.
Spectral Rich (10ms+)
Maximizes throughput by reducing switching overhead, but increases round-trip time.
3GPP Technical Specifications Archive
TS 38.213 Table 11.1.1-1
Enumerates the 62 standard slot formats. Formats 0-55 are fixed, while 56-61 are reserved or specialized patterns.
TS 38.211
Details the physical resource grid and symbol-level modulation (CP-OFDM) that underlies the TDD frame structure.
Radio Network Planning Note
Most global commercial 5G deployments (especially in the C-Band n78) utilize the DDDSU or DDDDSU patterns at 30kHz SCS to provide a balanced DL-centric experience while maintaining efficient beamforming synchronization.
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