From bc1844b482bad88b1138b112d8288dbe75ea9a56 Mon Sep 17 00:00:00 2001
From: Raghavendra Dinavahi <raghavendra.dinavahi@iis.fraunhofer.de>
Date: Fri, 9 May 2025 15:02:13 +0200
Subject: [PATCH] Added in the Conf file for testing in CI, description updated

---
 ci-scripts/conf_files/gnb.sa.band254.u0.25prb.rfsim.ntn.conf | 2 ++
 doc/RUNMODEM.md                                              | 3 +++
 2 files changed, 5 insertions(+)

diff --git a/ci-scripts/conf_files/gnb.sa.band254.u0.25prb.rfsim.ntn.conf b/ci-scripts/conf_files/gnb.sa.band254.u0.25prb.rfsim.ntn.conf
index 3e7dd08474..fa1bcc20c8 100644
--- a/ci-scripts/conf_files/gnb.sa.band254.u0.25prb.rfsim.ntn.conf
+++ b/ci-scripts/conf_files/gnb.sa.band254.u0.25prb.rfsim.ntn.conf
@@ -149,6 +149,8 @@ gNBs =
 
   #ext2
     #ntn_Config_r17
+      # This can be of values {s5, s10, s15, s20, s25, s30, s35, s40, s45, s50, s55, s60, s120, s180, s240, s900}
+      ntn-UlSyncValidityDuration-r17                                = 240;
       cellSpecificKoffset_r17                                       = 478;
       ta-Common-r17                                                 = 58629666; # 238.74 ms
       positionX-r17                                                 = 0;
diff --git a/doc/RUNMODEM.md b/doc/RUNMODEM.md
index f2e71390c7..ba2d48be28 100644
--- a/doc/RUNMODEM.md
+++ b/doc/RUNMODEM.md
@@ -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.