The timing advance received in RAR does not match the delay propagation that I configured

5G NR
, ,
1

Hello everyone,

In NR SA TDD SCS30kHz config, I added channel_dl path delay 6250ns.
In the RAR, I can see the TA value is 27.
In the gnb config, I didn’t configure n_timing_advance_offset , so it should use default value 25600.
Accoding to the timing advance formula, the TA=27 can compensate:
(271664/2 + 25600)*0.509ns = 20066ns
This result doesn’t correspond to the path delay configured in channel_dl.

Can someone tell me why, please?

Thanks in advance :slight_smile: