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Fix for the overflow issue while processing GPS based timestamp from RU

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The absslot_tx overflow issue observed during integration testing of AW2S
RU with GPS as the source for the clock synchronization. Causes the gNB
not to start the TX thread and stops the processing.
This commit is contained in:
vijay chadachan
2024-04-23 10:44:00 +02:00
parent 8a3c329e90
commit 1924b3c793
3 changed files with 10 additions and 10 deletions
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executables/nr-ru.c
+3 -3
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@@ -1108,8 +1108,8 @@ void ru_tx_func(void *param) {
for (; i < fp->slots_per_subframe / 2; i++)
cumul_samples += fp->get_samples_per_slot(i, fp);
int samples = cumul_samples / i;
int absslot_tx = info->timestamp_tx / samples;
int absslot_rx = absslot_tx - ru->sl_ahead;
int64_t absslot_tx = info->timestamp_tx / samples;
int64_t absslot_rx = absslot_tx - ru->sl_ahead;
int rt_prof_idx = absslot_rx % RT_PROF_DEPTH;
clock_gettime(CLOCK_MONOTONIC,&ru->rt_ru_profiling.start_RU_TX[rt_prof_idx]);
// do TX front-end processing if needed (precoding and/or IDFTs)
@@ -1335,7 +1335,7 @@ void *ru_thread( void *param ) {
proc->timestamp_tx += fp->get_samples_per_slot(i % fp->slots_per_frame, fp);
proc->tti_tx = (proc->tti_rx + ru->sl_ahead) % fp->slots_per_frame;
proc->frame_tx = proc->tti_rx > proc->tti_tx ? (proc->frame_rx + 1) & 1023 : proc->frame_rx;
int absslot_rx = proc->timestamp_rx/fp->get_samples_per_slot(proc->tti_rx,fp);
int64_t absslot_rx = proc->timestamp_rx/fp->get_samples_per_slot(proc->tti_rx,fp);
int rt_prof_idx = absslot_rx % RT_PROF_DEPTH;
clock_gettime(CLOCK_MONOTONIC,&ru->rt_ru_profiling.return_RU_south_in[rt_prof_idx]);
LOG_D(PHY,"AFTER fh_south_in - SFN/SL:%d%d RU->proc[RX:%d.%d TX:%d.%d] RC.gNB[0]:[RX:%d%d TX(SFN):%d]\n",