gNB: change TA update interval to 100 frames instead of 10

The RTT for GEO satellites is more than 500 ms.
And as the TA update interval must be greater than the RTT, we increase it to 1 second instead of 100 ms.
Should also do no harm for terrestrial networks.

openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_dlsch.c

@@ -660,7 +660,7 @@ static void pf_dl(module_id_t module_id,
       }
 
       /* Check DL buffer and skip this UE if no bytes and no TA necessary */
-      if (sched_ctrl->num_total_bytes == 0 && frame != (sched_ctrl->ta_frame + 10) % 1024)
+      if (sched_ctrl->num_total_bytes == 0 && frame != (sched_ctrl->ta_frame + 100) % 1024)
         continue;
 
       /* Calculate coeff */
@@ -805,8 +805,8 @@ static void pf_dl(module_id_t module_id,
     // awaiting. Therefore, for the time being, we put a fixed overhead of 12
     // (for 4 PDUs) and optionally + 2 for TA. Once RLC gives the number of
     // PDUs, we replace with 3 * numPDUs
-    const int oh = 3 * 4 + 2 * (frame == (sched_ctrl->ta_frame + 10) % 1024);
-    //const int oh = 3 * sched_ctrl->dl_pdus_total + 2 * (frame == (sched_ctrl->ta_frame + 10) % 1024);
+    const int oh = 3 * 4 + 2 * (frame == (sched_ctrl->ta_frame + 100) % 1024);
+    //const int oh = 3 * sched_ctrl->dl_pdus_total + 2 * (frame == (sched_ctrl->ta_frame + 100) % 1024);
     nr_find_nb_rb(sched_pdsch->Qm,
                   sched_pdsch->R,
                   1, // no transform precoding for DL
@@ -958,7 +958,7 @@ void nr_schedule_ue_spec(module_id_t module_id,
      * Possible improvement: take the periodicity from input file.
      * 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 + 10) % 1024) {
+    if (frame == (sched_ctrl->ta_frame + 100) % 1024) {
       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);
     }