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srsLTE
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Delay application of time_adv by 1 subframe

This commit is contained in:
Ismael Gomez 2018-04-24 13:50:59 +02:00
parent 5ab0149218
commit 74d6028769
2 changed files with 9 additions and 3 deletions
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2
srsue/hdr/phy/phch_recv.h
View File

@ -425,7 +425,7 @@ private:
// This is the primary cell
srslte_cell_t cell;
bool started;
float time_adv_sec;
float time_adv_sec, next_time_adv_sec;
uint32_t tti;
bool do_agc;

10
srsue/src/phy/phch_recv.cc
View File

@ -453,6 +453,9 @@ void phch_recv::run_thread()
worker->set_tti(tti, tx_mutex_cnt);
worker->set_tx_time(tx_time, next_offset);
next_offset = 0;
if (next_time_adv_sec != time_adv_sec) {
time_adv_sec = next_time_adv_sec;
}
tx_mutex_cnt = (tx_mutex_cnt+1) % nof_tx_mutex;
// Advance/reset prach subframe pointer
@ -614,8 +617,11 @@ void phch_recv::set_agc_enable(bool enable)
void phch_recv::set_time_adv_sec(float time_adv_sec)
{
this->time_adv_sec = time_adv_sec;
next_offset = -time_adv_sec*srslte_sampling_freq_hz(cell.nof_prb);
// If transmitting earlier, transmit less samples to align time advance. If transmit later just delay next TX
if (time_adv_sec > this->time_adv_sec) {
next_offset = -floor(time_adv_sec*srslte_sampling_freq_hz(cell.nof_prb)+1);
}
this->next_time_adv_sec = time_adv_sec;
Info("Applying time_adv_sec=%.1f us, next_offset=%d\n", time_adv_sec*1e6, next_offset);
}