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making SFN dependent on GPS time (when available)

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This commit is contained in:
Florian Kaltenberger
2022-03-22 11:10:07 +01:00
parent 828387c512
commit 5679e4a3b3
2 changed files with 14 additions and 7 deletions
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executables/nr-ru.c
+8 -1
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@@ -604,6 +604,7 @@ void *emulatedRF_thread(void *param) {
void rx_rf(RU_t *ru,int *frame,int *slot) {
RU_proc_t *proc = &ru->proc;
NR_DL_FRAME_PARMS *fp = ru->nr_frame_parms;
openair0_config_t *cfg = &ru->openair0_cfg;
void *rxp[ru->nb_rx];
unsigned int rxs;
int i;
@@ -653,7 +654,13 @@ void rx_rf(RU_t *ru,int *frame,int *slot) {
}
}
proc->frame_rx = (proc->timestamp_rx / (fp->samples_per_subframe*10))&1023;
//compute system frame number (SFN) according to O-RAN-WG4-CUS.0-v02.00 (using alpha=beta=0)
// this assumes that the USRP has been synchronized to the GPS time
// OAI uses timestamps in sample time stored in int64_t, but it will fit in double precision for many years to come.
double gps_sec = ((double) ts)/cfg->sample_rate;
proc->frame_rx = ((int64_t) (gps_sec/0.01)) & 1023;
//proc->frame_rx = (proc->timestamp_rx / (fp->samples_per_subframe*10))&1023;
proc->tti_rx = fp->get_slot_from_timestamp(proc->timestamp_rx,fp);
// synchronize first reception to frame 0 subframe 0
LOG_D(PHY,"RU %d/%d TS %llu , frame %d, slot %d.%d / %d\n",