📡 5G NR Timing Advance Distance
3GPP TS 38.211 · 38.213 · 38.321 (Rel‑19)
Tc
⏱️ Timing Advance Command → NTA
Formulas (TS 38.321):
RAR: NTA = TA × 16 × 64 / 2μ
MAC‑CE: NTA,new = NTA,old + (TA – 31) × 16 × 64 / 2μ
RAR: NTA = TA × 16 × 64 / 2μ
MAC‑CE: NTA,new = NTA,old + (TA – 31) × 16 × 64 / 2μ
📏 One‑way Distance
0.00 m
🕒 Round‑Trip Time
0.00 μs
📡 Maximum Cell Range (for this configuration)
0.00 km
NTA,offset = 25600 Tc · NTA total = 0 Tc
📐 3GPP Timing Advance (TS 38.321)
Basic time unit:
Total TA:
One‑way distance =
c = 299 792 458 m/s
NTA,offset values per frequency range as per TS 38.213
Basic time unit:
Tc = 1 / (480 kHz × 4096) = 0.509 nsTotal TA:
NTA,total = NTA + NTA,offsetOne‑way distance =
(NTA,total × Tc × c) / 2c = 299 792 458 m/s
NTA,offset values per frequency range as per TS 38.213
📖 Based on 3GPP TS 38.211 (4.3), 38.213 (4.2), 38.321 (5.2)
🧭 NTA from RAR/MAC‑CE formulas match the image specification.
🧭 NTA from RAR/MAC‑CE formulas match the image specification.
🏛️ Base Station (left) ↔ UE (right) · wave pulse = radio signal
Distance scales to max cell range · click “Animate Wave” to see signal travel
Distance scales to max cell range · click “Animate Wave” to see signal travel