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bugfix: fix timing advance

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- re-use ta_timer
- when ta_timer is running:
  - no TA sent to UE
  - no TA from UE (for UE to have time to apply previous TA command)
- decrease ta_timer every TTI
- be careful to use correct value of ta_update (31 means no TA)

Maybe not correct, to be checked.
This commit is contained in:
Cedric Roux
2017-10-10 14:10:32 +02:00
parent a9d6e04cf2
commit 9b428e5e2f
6 changed files with 46 additions and 45 deletions
Download Patch File Download Diff File Expand all files Collapse all files
openair1/SCHED/phy_procedures_lte_eNb.c
+17 -35
View File
@@ -1525,19 +1525,15 @@ void init_te_thread(PHY_VARS_eNB *eNB,pthread_attr_t *attr_te) {
}
void fill_rx_indication(PHY_VARS_eNB *eNB,int UE_id,int frame,int subframe) {
void fill_rx_indication(PHY_VARS_eNB *eNB,int UE_id,int frame,int subframe)
{
nfapi_rx_indication_pdu_t *pdu;
int timing_advance_update;
int sync_pos;
uint32_t harq_pid = subframe2harq_pid(&eNB->frame_parms,
frame,subframe);
frame,subframe);
pthread_mutex_lock(&eNB->UL_INFO_mutex);
pdu = &eNB->UL_INFO.rx_ind.rx_pdu_list[eNB->UL_INFO.rx_ind.number_of_pdus];
@@ -1546,55 +1542,41 @@ void fill_rx_indication(PHY_VARS_eNB *eNB,int UE_id,int frame,int subframe) {
pdu->rx_ue_information.rnti = eNB->ulsch[UE_id]->rnti;
pdu->rx_indication_rel8.length = eNB->ulsch[UE_id]->harq_processes[harq_pid]->TBS>>3;
pdu->rx_indication_rel8.offset = 0; // filled in at the end of the UL_INFO formation
pdu->data = eNB->ulsch[UE_id]->harq_processes[harq_pid]->b;
pdu->data = eNB->ulsch[UE_id]->harq_processes[harq_pid]->b;
// estimate timing advance for MAC
sync_pos = lte_est_timing_advance_pusch(eNB,UE_id);
timing_advance_update = sync_pos - eNB->frame_parms.nb_prefix_samples/4; //to check
// if (timing_advance_update > 10) { dump_ulsch(eNB,frame,subframe,UE_id); exit(-1);}
// if (timing_advance_update < -10) { dump_ulsch(eNB,frame,subframe,UE_id); exit(-1);}
switch (eNB->frame_parms.N_RB_DL) {
case 6:
pdu->rx_indication_rel8.timing_advance = timing_advance_update;
break;
case 15:
pdu->rx_indication_rel8.timing_advance = timing_advance_update/2;
break;
case 25:
pdu->rx_indication_rel8.timing_advance = timing_advance_update/4;
break;
case 50:
pdu->rx_indication_rel8.timing_advance = timing_advance_update/8;
break;
case 75:
pdu->rx_indication_rel8.timing_advance = timing_advance_update/12;
break;
case 100:
pdu->rx_indication_rel8.timing_advance = timing_advance_update/16;
break;
case 6: /* nothing to do */ break;
case 15: timing_advance_update /= 2; break;
case 25: timing_advance_update /= 4; break;
case 50: timing_advance_update /= 8; break;
case 75: timing_advance_update /= 12; break;
case 100: timing_advance_update /= 16; break;
default: abort();
}
// put timing advance command in 0..63 range
pdu->rx_indication_rel8.timing_advance += 31;
if (pdu->rx_indication_rel8.timing_advance < 0) pdu->rx_indication_rel8.timing_advance = 0;
if (pdu->rx_indication_rel8.timing_advance > 63) pdu->rx_indication_rel8.timing_advance = 63;
timing_advance_update += 31;
if (timing_advance_update < 0) timing_advance_update = 0;
if (timing_advance_update > 63) timing_advance_update = 63;
pdu->rx_indication_rel8.timing_advance = timing_advance_update;
// estimate UL_CQI for MAC (from antenna port 0 only)
int SNRtimes10 = dB_fixed_times10(eNB->pusch_vars[UE_id]->ulsch_power[0]) - 200;//(10*eNB->measurements.n0_power_dB[0]);
if (SNRtimes10 < -640) pdu->rx_indication_rel8.ul_cqi=0;
else if (SNRtimes10 > 635) pdu->rx_indication_rel8.ul_cqi=255;
else pdu->rx_indication_rel8.ul_cqi=(640+SNRtimes10)/5;
LOG_D(PHY,"[PUSCH %d] Filling RX_indication with SNR %d (%d), timing_advance %d (update %d)\n",
harq_pid,SNRtimes10,pdu->rx_indication_rel8.ul_cqi,pdu->rx_indication_rel8.timing_advance,
timing_advance_update);
harq_pid,SNRtimes10,pdu->rx_indication_rel8.ul_cqi,pdu->rx_indication_rel8.timing_advance,
timing_advance_update);
eNB->UL_INFO.rx_ind.number_of_pdus++;
pthread_mutex_unlock(&eNB->UL_INFO_mutex);
}
void release_harq(PHY_VARS_eNB *eNB,int UE_id,int tb,uint16_t frame,uint8_t subframe,uint16_t mask) {