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Maintenance of Uplink Time Alignment. Introduced control on TA transmission and TA update application.

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- ta_timer at gNB side to control the transmission of TA to the UE. This is now happening every 20 slots.
- when the timer resets gNB is now transmitting the TA whether it is zero or not.
- introduced struct NR_UL_TIME_ALIGNMENT_t to handle configuration of time alignment related parameters.
- UE PHY RX: is now triggered through a flag when to store the TA command, the frame and slot
  when the application should occur.
- UE PHY TX: when the tx frame and slot match the time alignment configuration, it process the TA command and applies the
  TA update
This commit is contained in:
Guido Casati
2019-12-06 10:46:51 +01:00
committed by cig
parent 5ac8b6f34d
commit c6855cb8d2
8 changed files with 118 additions and 48 deletions
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executables/nr-ue.c
+25 -1
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@@ -461,6 +461,15 @@ void UE_processing(void *arg) {
UE_nr_rxtx_proc_t *proc = &rxtxD->proc;
PHY_VARS_NR_UE *UE = rxtxD->UE;
processSlotRX(UE, proc);
uint8_t gNB_id = 0;
// params for UL time alignment procedure
NR_UL_TIME_ALIGNMENT_t *ul_time_alignment = &UE->ul_time_alignment[gNB_id];
uint8_t numerology = UE->frame_parms.numerology_index;
uint16_t bwp_ul_NB_RB = UE->frame_parms.N_RB_UL;
int slot_tx = proc->nr_tti_tx;
int frame_tx = proc->frame_tx;
//printf(">>> mac ended\n");
// Prepare the future Tx data
/*
@@ -473,6 +482,21 @@ void UE_processing(void *arg) {
#endif
*/
/* UL time alignment
// If the current tx frame and slot match the TA configuration in ul_time_alignment
// then timing advance is processed and set to be applied in the next UL transmission */
if (UE->mac_enabled == 1) {
if (frame_tx == ul_time_alignment->ta_frame && slot_tx == ul_time_alignment->ta_slot){
LOG_D(PHY,"Applying timing advance -- frame %d -- slot %d\n", frame_tx, slot_tx);
//if (nfapi_mode!=3){
nr_process_timing_advance(UE->Mod_id, UE->CC_id, ul_time_alignment->ta_command, numerology, bwp_ul_NB_RB);
ul_time_alignment->ta_frame = -1;
ul_time_alignment->ta_slot = -1;
//}
}
}
if (proc->nr_tti_tx == NR_UPLINK_SLOT || UE->frame_parms.frame_type == FDD){
@@ -480,7 +504,7 @@ void UE_processing(void *arg) {
if (UE->mode != loop_through_memory)
phy_procedures_nrUE_TX(UE,proc,0,thread_id);
phy_procedures_nrUE_TX(UE,proc,gNB_id,thread_id);
}