diff --git a/doc/RUNMODEM.md b/doc/RUNMODEM.md
index 1bc6268199..fef128e2f7 100644
--- a/doc/RUNMODEM.md
+++ b/doc/RUNMODEM.md
@@ -298,7 +298,7 @@ Also, to perform an autonomous TA update based on the DL drift, the boolean para
 So an example NR UE command for FDD, 5MHz BW, 15 kHz SCS, transparent LEO satellite 5G NR NTN is this:
 ```
 cd cmake_targets
-sudo ./ran_build/build/nr-uesoftmodem --band 66 -C 2152680000 --CO -400000000 -r 25 --numerology 0 --ssb 48 --sa --rfsim --rfsimulator.prop_delay 20 --rfsimulator.options chanmod -O ../targets/PROJECTS/GENERIC-NR-5GC/CONF/channelmod_rfsimu_LEO_satellite.conf --ntn-koffset 40 --ntn-ta-common 37.74 --ntn-ta-commondrift -50 --autonomous-ta
+sudo ./ran_build/build/nr-uesoftmodem --band 66 -C 2152680000 --CO -400000000 -r 25 --numerology 0 --ssb 48 --sa --rfsim --rfsimulator.prop_delay 20 --rfsimulator.options chanmod -O ../targets/PROJECTS/GENERIC-NR-5GC/CONF/channelmod_rfsimu_LEO_satellite.conf --time-sync-I 0.2 --ntn-koffset 40 --ntn-ta-common 37.74 --ntn-ta-commondrift -50 --autonomous-ta
 ```
 
 # Specific OAI modes
diff --git a/executables/nr-ue.c b/executables/nr-ue.c
index a742ea2e9d..d26547b14b 100644
--- a/executables/nr-ue.c
+++ b/executables/nr-ue.c
@@ -883,7 +883,11 @@ void *UE_thread(void *arg)
       stream_status = STREAM_STATUS_SYNCING;
       syncInFrame(UE, &sync_timestamp, intialSyncOffset);
       openair0_write_reorder_clear_context(&UE->rfdevice);
-      UE->max_pos_acc = get_nrUE_params()->ntn_ta_commondrift * 1e-6 * fp->samples_per_frame / get_nrUE_params()->time_sync_I; // ntn_ta_commondrift is in µs/s, max_pos_acc * time_sync_I is in samples/frame
+      if (get_nrUE_params()->time_sync_I)
+        // ntn_ta_commondrift is in µs/s, max_pos_acc * time_sync_I is in samples/frame
+        UE->max_pos_acc = get_nrUE_params()->ntn_ta_commondrift * 1e-6 * fp->samples_per_frame / get_nrUE_params()->time_sync_I;
+      else
+        UE->max_pos_acc = 0;
       shiftForNextFrame = -(UE->init_sync_frame + trashed_frames + 2) * UE->max_pos_acc * get_nrUE_params()->time_sync_I; // compensate for the time drift that happened during initial sync
       LOG_D(PHY, "max_pos_acc = %d, shiftForNextFrame = %d\n", UE->max_pos_acc, shiftForNextFrame);
       // TODO: remove this autonomous TA and use up-to-date values of ta-Common, ta-CommonDrift and ta-CommonDriftVariant from received SIB19 instead
diff --git a/executables/nr-uesoftmodem.h b/executables/nr-uesoftmodem.h
index 797b5d8f49..65327cc3b2 100644
--- a/executables/nr-uesoftmodem.h
+++ b/executables/nr-uesoftmodem.h
@@ -65,7 +65,7 @@
   {"SLC",                          CONFIG_HLP_SLF,             0,               .u64ptr=&(sidelink_frequency[0][0]),         .defuintval=2600000000,TYPE_UINT64,0}, \
   {"num-ues",                      NULL,                       0,               .iptr=&(NB_UE_INST),                         .defuintval=1,     TYPE_INT,      0}, \
   {"time-sync-P",                  CONFIG_HLP_TIME_SYNC_P,     0,               .dblptr=&(nrUE_params.time_sync_P),          .defdblval=0.5,    TYPE_DOUBLE,   0}, \
-  {"time-sync-I",                  CONFIG_HLP_TIME_SYNC_I,     0,               .dblptr=&(nrUE_params.time_sync_I),          .defdblval=0.2,    TYPE_DOUBLE,   0}, \
+  {"time-sync-I",                  CONFIG_HLP_TIME_SYNC_I,     0,               .dblptr=&(nrUE_params.time_sync_I),          .defdblval=0.0,    TYPE_DOUBLE,   0}, \
   {"ntn-koffset",                  CONFIG_HLP_NTN_KOFFSET,     0,               .uptr=&(nrUE_params.ntn_koffset),            .defuintval=0,     TYPE_UINT,     0}, \
   {"ntn-ta-common",                CONFIG_HLP_NTN_TA_COMMON,   0,               .dblptr=&(nrUE_params.ntn_ta_common),        .defdblval=0.0,    TYPE_DOUBLE,   0}, \
   {"ntn-ta-commondrift",           CONFIG_HLP_NTN_TA_COMMONDRIFT, 0,            .dblptr=&(nrUE_params.ntn_ta_commondrift),   .defdblval=0.0,    TYPE_DOUBLE,   0}, \