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Synchronization
Timing Advance Calculator
Calculate propagation distance and Timing Advance (TA) commands for 5G NR and LTE synchronization.
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Waiting for configuration input...Timing advance fundamentals
Timing Advance (TA) is a technique used in cellular systems to ensure that uplink transmissions from multiple UEs arrive at the base station simultaneously, regardless of their distance. It compensates for the propagation delay (Time of Flight).
Standardized step sizes
In 5G NR, the TA step size depends on the subcarrier spacing (numerology). The basic time unit Tc is ≈ 0.509 ns. A TA index command of 1 corresponds to a timing move of 1024 × Tc / 2^μ (≈ 0.52 μs or 78.1 meters one-way for μ=0).
Network limit:The total timing advance applies the formula TTA = (NTA + NTA,offset) × Tc. The initial TA command (RAR, 0-3846) provides high-granularity synchronization, while subsequent MAC CE commands offer ±32 step adjustments to maintain alignment.
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