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Merge remote-tracking branch 'origin/ntn_leo_time_comp' into integration_2024_w34

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This commit is contained in:
Robert Schmidt
2024-08-27 14:30:15 +02:00
parent 922e810a82 b17b44dffb
commit 68b29301b0
18 changed files with 308 additions and 67 deletions
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executables/nr-ue.c
+12 -7
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@@ -597,7 +597,7 @@ void processSlotTX(void *arg)
static int UE_dl_preprocessing(PHY_VARS_NR_UE *UE, const UE_nr_rxtx_proc_t *proc, int *tx_wait_for_dlsch, nr_phy_data_t *phy_data)
{
int sampleShift = 0;
int sampleShift = INT_MAX;
NR_DL_FRAME_PARMS *fp = &UE->frame_parms;
if (UE->sl_mode == 2)
fp = &UE->SL_UE_PHY_PARAMS.sl_frame_params;
@@ -886,7 +886,12 @@ void *UE_thread(void *arg)
stream_status = STREAM_STATUS_SYNCING;
syncInFrame(UE, &sync_timestamp, intialSyncOffset);
openair0_write_reorder_clear_context(&UE->rfdevice);
shiftForNextFrame = 0; // will be used to track clock drift
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
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
if (get_nrUE_params()->autonomous_ta)
UE->timing_advance -= 2 * shiftForNextFrame;
// read in first symbol
AssertFatal(fp->ofdm_symbol_size + fp->nb_prefix_samples0
== UE->rfdevice.trx_read_func(&UE->rfdevice,
@@ -947,7 +952,10 @@ void *UE_thread(void *arg)
if (slot_nr == nb_slot_frame - 1) {
// we shift of half of measured drift, at each beginning of frame for both rx and tx
iq_shift_to_apply = shiftForNextFrame;
shiftForNextFrame = 0; // We will get a new measured offset if we decode PBCH
// TODO: remove this autonomous TA and use up-to-date values of ta-Common, ta-CommonDrift and ta-CommonDriftVariant from received SIB19 instead
if (get_nrUE_params()->autonomous_ta)
UE->timing_advance -= 2 * shiftForNextFrame;
shiftForNextFrame = -round(UE->max_pos_acc * get_nrUE_params()->time_sync_I);
}
const int readBlockSize = get_readBlockSize(slot_nr, fp) - iq_shift_to_apply;
@@ -991,10 +999,7 @@ void *UE_thread(void *arg)
nr_rxtx_thread_data_t *curMsgRx = (nr_rxtx_thread_data_t *)NotifiedFifoData(newRx);
*curMsgRx = (nr_rxtx_thread_data_t){.proc = curMsg.proc, .UE = UE};
int ret = UE_dl_preprocessing(UE, &curMsgRx->proc, tx_wait_for_dlsch, &curMsgRx->phy_data);
if (ret)
// if ret is 0, no rx_offset has been computed,
// or the computed value is 0 = no offset to do
// we store it to apply the drift compensation at beginning of next frame
if (ret != INT_MAX)
shiftForNextFrame = ret;
pushTpool(&(get_nrUE_params()->Tpool), newRx);