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NR UE: fix USRP write timestamp when applying new timing_advance value

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This commit is contained in:
Thomas Schlichter
2020-11-27 15:56:14 +01:00
parent 4b1d496923
commit 010321e582
1 changed files with 12 additions and 10 deletions
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executables/nr-ue.c
+12 -10
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@@ -599,7 +599,7 @@ void *UE_thread(void *arg) {
//this thread should be over the processing thread to keep in real time
PHY_VARS_NR_UE *UE = (PHY_VARS_NR_UE *) arg;
// int tx_enabled = 0;
openair0_timestamp timestamp;
openair0_timestamp timestamp, writeTimestamp;
void *rxp[NB_ANTENNAS_RX], *txp[NB_ANTENNAS_TX];
int start_rx_stream = 0;
AssertFatal(0== openair0_device_load(&(UE->rfdevice), &openair0_cfg[0]), "");
@@ -730,11 +730,6 @@ void *UE_thread(void *arg) {
UE->rx_offset_diff;
}
if (UE->timing_advance != timing_advance) {
writeBlockSize -= UE->timing_advance - timing_advance;
timing_advance = UE->timing_advance;
}
AssertFatal(readBlockSize ==
UE->rfdevice.trx_read_func(&UE->rfdevice,
&timestamp,
@@ -782,12 +777,19 @@ void *UE_thread(void *arg) {
LOG_E(PHY,"Decoded frame index (%d) is not compatible with current context (%d), UE should go back to synch mode\n",
decoded_frame_rx, curMsg->proc.frame_rx );
// use previous timing_advance value to compute writeTimestamp
writeTimestamp = timestamp + UE->frame_parms.get_samples_slot_timestamp(slot_nr, &UE->frame_parms,DURATION_RX_TO_TX - RX_NB_TH) -
firstSymSamp - openair0_cfg[0].tx_sample_advance - UE->N_TA_offset - timing_advance;
// but use current UE->timing_advance value to compute writeBlockSize
if (UE->timing_advance != timing_advance) {
writeBlockSize -= UE->timing_advance - timing_advance;
timing_advance = UE->timing_advance;
}
AssertFatal( writeBlockSize ==
UE->rfdevice.trx_write_func(&UE->rfdevice,
timestamp+
UE->frame_parms.get_samples_slot_timestamp(slot_nr,
&UE->frame_parms,DURATION_RX_TO_TX - RX_NB_TH) - firstSymSamp -
openair0_cfg[0].tx_sample_advance - UE->N_TA_offset - UE->timing_advance,
writeTimestamp,
txp,
writeBlockSize,
UE->frame_parms.nb_antennas_tx,