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fix(oru): Fix timestamp generation in O-RU

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Instead of guessing what is the absolute timestamp of each symbol returned
from fronthaul, add absolute hyper frame from GPS Epoch to the O-RU. The
O-RU can calculate the absolute sample index from hyper frame reliably
regardless of the frame/slot/symbol ordering.

Add config file for 1x1 O-DU that matches the edited O-RU config.

Signed-off-by: Bartosz Podrygajlo <bartosz.podrygajlo@openairinterface.org>
This commit is contained in:
Bartosz Podrygajlo
2026-05-27 15:11:56 +02:00
parent 71c692d727
commit df5a9facbe
8 changed files with 145 additions and 26 deletions
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19
executables/nr-oru.c
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@@ -344,33 +344,28 @@ void *oru_north_read_thread(void *arg)
txDataF_ptr[aatx] = txDataF[aatx];
}
uint32_t start_frame, start_slot;
uint64_t start_hyper_frame;
struct timespec utc_anchor_point;
oru_fh_get_utc_anchor_point(oru->fronthaul, &start_frame, &start_slot, &utc_anchor_point);
oru_fh_get_utc_anchor_point(oru->fronthaul, &start_hyper_frame, &start_frame, &start_slot, &utc_anchor_point);
AssertFatal(ru->rfdevice.get_timestamp != NULL, "rfdevice has no capability to translate UTC timestamp to sample index\n");
int64_t start_timestamp = ru->rfdevice.get_timestamp(&ru->rfdevice, &utc_anchor_point);
// subtract the start_frame and start_slot from the timestamp simplify calculation below.
start_timestamp -= (start_frame * fp->samples_per_frame + get_samples_slot_timestamp(fp, start_slot));
// Now start_timestamp points to the start sample of the frame 0 slot 0 symbol 0 of hyperframe 0
uint64_t hyper_frame_number = 0;
uint32_t last_frame = 0;
LOG_A(PHY, "DL thread started: start_timestamp %ld, start_frame %d, start_slot %d\n", start_timestamp, start_frame, start_slot);
while (!oai_exit) {
int frame = -1, slot = -1, symbol = -1;
int ret = oru_fh_tx_read_symbol(oru->fronthaul, (uint32_t **)txDataF_ptr, ru->nb_tx, &frame, &slot, &symbol);
uint64_t hyper_frame;
int ret = oru_fh_tx_read_symbol(oru->fronthaul, (uint32_t **)txDataF_ptr, ru->nb_tx, &hyper_frame, &frame, &slot, &symbol);
if (ret != 0) {
LOG_E(PHY, "[RU_thread] read data error: frame %d, slot %d, symbol %d\n", frame, slot, symbol);
continue;
}
if (last_frame + 1 != frame) {
if (frame == 0) {
hyper_frame_number++;
} else if (last_frame != frame ) {
LOG_E(PHY, "Received frames out of order, last_frame %d, frame %d\n", last_frame, frame);
}
if (start_hyper_frame > hyper_frame) {
continue;
}
last_frame = frame;
uint64_t num_frames = hyper_frame_number * 1024 + frame;
uint64_t num_frames = (hyper_frame - start_hyper_frame) * 1024 + frame;
int64_t timestamp = start_timestamp + num_frames * fp->samples_per_frame + get_samples_slot_timestamp(fp, slot)
+ get_samples_symbol_timestamp(fp, slot, symbol);
if (timestamp < 0) {