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Merge remote-tracking branch 'origin/NR_NTN_ulsyncduration' into integration_2025_w25 (!3367)

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Enabling usage of ulsyncvalidityDuration timer in SIB19

ntn-UlSyncValidityDuration in SIB19 from Spec 38.331 v17.12 A validity
duration configured by the network for assistance information which
indicates the maximum time duration (from epochTime) during which the UE
can apply assistance information without having acquired new assistance
information. The unit of ntn-UlSyncValidityDuration is second. Value s5
corresponds to 5 s, value s10 indicate 10 s and so on.

    ntn-UlSyncValidityDuration-r17 ENUMERATED{ s5, s10, s15, s20, s25, s30, s35,s40, s45, s50, s55, s60, s120, s180, s240, s900}

Implementation of epochtime is under discussion.

It can be configured in configuration file according to the above
enumeration. For GEO - 240s, MEO - 20s, LEO-5s can be used.
This commit is contained in:
Robert Schmidt
2025-06-19 08:25:28 +02:00
parent 54af637997 7877e38890
commit f5a07f17f1
14 changed files with 318 additions and 35 deletions
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doc/RUNMODEM.md
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@@ -231,6 +231,9 @@ Or by providing this the the command line parameters:
The main parameters to cope with the large NTN propagation delay are cellSpecificKoffset, ta-Common, ta-CommonDrift and the ephemeris data (satellite position and velocity vectors).
The parameter `ntn-UlSyncValidityDuration-r17` indicates the maximum time duration from epochtime during which the UE can apply assistance information without having acquired new assistance information. i.e this enables UE to re-read SIB19 before timer with value ulSyncValidityDuration expires. The unit of the field is in seconds. Example values for GEO: 240s, MEO: 20s, LEO: 5s.
As epochtime is not implemented yet, UE starts the timer from the TTI where SIB19 is received with ntn-UlSyncValidityDuration-r17 IE.
The parameter `cellSpecificKoffset_r17` is the scheduling offset used for the timing relationships that are modified for NTN (see TS 38.213).
The unit of the field Koffset is number of slots for a given subcarrier spacing of 15 kHz.