NR UE: calculate the epoch_hfn whenever an ntn_Config_r17 is received

openair2/LAYER2/NR_MAC_UE/config_ue.c

@@ -318,6 +318,10 @@ static void configure_ntn_ta(module_id_t module_id,
   // epochTime_r17 must be present (this is assured by function `eval_epoch_time()`)
   const NR_EpochTime_r17_t *epoch_time_r17 = ntn_Config_r17->epochTime_r17;
   AssertFatal(epoch_time_r17, "epoch_time_r17 should not be NULL here\n");
+  if (epoch_time_r17->sfn_r17 >= frame)
+    ntn_ta->epoch_hfn = hfn;
+  else
+    ntn_ta->epoch_hfn = hfn + 1;
   ntn_ta->epoch_sfn = epoch_time_r17->sfn_r17;
   ntn_ta->epoch_subframe = epoch_time_r17->subFrameNR_r17;
 
@@ -368,9 +372,11 @@ static void configure_ntn_ta(module_id_t module_id,
 
   ntn_ta->ntn_params_changed = true;
 
-  LOG_D(NR_MAC,
-        "SIB19 Rxd. Epoch SFN: %d, Epoch Subframe: %d, k_offset: %ldms, N_Common_Ta: %fms, drift: %fµs/s, variant %fµs/s², "
+  LOG_I(NR_MAC,
+        "SIB19 Rxd. Epoch HFN: %d, Epoch SFN: %d, Epoch Subframe: %d, k_offset: %ldms, "
+        "N_Common_Ta: %fms, drift: %fµs/s, variant %fµs/s², "
         "N_UE_TA: %fms, drift: %fµs/s, variant %fµs/s²\n",
+        ntn_ta->epoch_hfn,
         ntn_ta->epoch_sfn,
         ntn_ta->epoch_subframe,
         ntn_ta->cell_specific_k_offset,

openair2/LAYER2/NR_MAC_UE/mac_defs.h

@@ -543,6 +543,7 @@ typedef struct {
 } si_schedInfo_t;
 
 typedef struct ntn_timing_advance_components {
+  int epoch_hfn;
   int epoch_sfn;
   int epoch_subframe;
 

openair2/LAYER2/NR_MAC_UE/nr_ue_scheduler.c

@@ -2849,6 +2849,7 @@ static void schedule_ntn_config_command(fapi_nr_dl_config_request_t *dl_config,
 {
   fapi_nr_dl_ntn_config_command_pdu *ntn_config_command_pdu = &dl_config->dl_config_list[dl_config->number_pdus].ntn_config_command_pdu;
 
+  ntn_config_command_pdu->epoch_hfn = mac->ntn_ta.epoch_hfn;
   ntn_config_command_pdu->epoch_sfn = mac->ntn_ta.epoch_sfn;
   ntn_config_command_pdu->epoch_subframe = mac->ntn_ta.epoch_subframe;
   ntn_config_command_pdu->cell_specific_k_offset = mac->ntn_ta.cell_specific_k_offset;