ta update forced to happen every 100 frames.

openair1/SCHED_NR_UE/phy_procedures_nr_ue.c

@@ -233,9 +233,15 @@ int get_tx_amp_prach(int power_dBm, int power_max_dBm, int N_RB_UL){
 // - Application of timing adjustment according to TS 38.213 p4.2
 // todo:
 // - handle RAR TA application as per ch 4.2 TS 38.213
+static uint64_t idx = 0;
+static int lastFrame;
 void ue_ta_procedures(PHY_VARS_NR_UE *ue, int slot_tx, int frame_tx)
 {
-  if (frame_tx == ue->ta_frame && slot_tx == ue->ta_slot) {
+  if ( (frame_tx == ue->ta_frame && slot_tx == ue->ta_slot && idx == 0) ||
+       (frame_tx == ue->ta_frame && slot_tx == ue->ta_slot && (frame_tx - lastFrame) == 100) ) {
+        
+    lastFrame = frame_tx;
+    idx = 1;
 
     uint16_t ofdm_symbol_size = ue->frame_parms.ofdm_symbol_size;
 

openair2/LAYER2/NR_MAC_UE/nr_ue_procedures.c

@@ -3726,6 +3726,7 @@ void nr_ue_process_mac_pdu(nr_downlink_indication_t *dl_info,
         ul_time_alignment->ta_command = ta;
         ul_time_alignment->frame = frameP;
         ul_time_alignment->slot = slot;
+        LOG_D(NR_MAC, "ul_time_alignment->frame: %d, ul_time_alignment->slot: %d\n", ul_time_alignment->frame, ul_time_alignment->slot);
         ul_time_alignment->ta_apply = true;
         /*
         #ifdef DEBUG_HEADER_PARSING

openair2/LAYER2/NR_MAC_UE/nr_ue_scheduler.c

@@ -3181,6 +3181,7 @@ void schedule_ta_command(fapi_nr_dl_config_request_t *dl_config, NR_UL_TIME_ALIG
   ta->ta_frame = ul_time_alignment->frame;
   ta->ta_slot = ul_time_alignment->slot;
   ta->ta_command = ul_time_alignment->ta_command;
+  LOG_D(NR_MAC, "ta_frame: %d, ta_slot: %d, ta_command: %d\n", ta->ta_frame, ta->ta_slot, ta->ta_command);
   dl_config->dl_config_list[dl_config->number_pdus].pdu_type = FAPI_NR_CONFIG_TA_COMMAND;
   dl_config->number_pdus += 1;
   ul_time_alignment->ta_apply = false;

openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_dlsch.c

@@ -911,6 +911,7 @@ void nr_schedule_ue_spec(module_id_t module_id,
      * If such UE is not scheduled now, it will be by the preprocessor later.
      * If we add the CE, ta_apply will be reset */
     if (frame == (sched_ctrl->ta_frame + 100) % 1024) {
+      LOG_D(NR_MAC, "frame: %d, sched_ctrl->ta_frame: %d\n", frame, sched_ctrl->ta_frame);
       sched_ctrl->ta_apply = true; /* the timer is reset once TA CE is scheduled */
       LOG_D(NR_MAC, "[UE %04x][%d.%d] UL timing alignment procedures: setting flag for Timing Advance command\n", UE->rnti, frame, slot);
     }