Find max coeff from UE_sched

openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_dlsch.c

@@ -445,7 +445,6 @@ void pf_dl(module_id_t module_id,
            uint8_t *rballoc_mask,
            int max_num_ue) {
 
-  const int UE_id = 0;
   NR_UE_info_t *UE_info = &RC.nrmac[module_id]->UE_info;
   float coeff_ue[MAX_MOBILES_PER_GNB];
   // UEs that could be scheduled
@@ -525,29 +524,43 @@ void pf_dl(module_id_t module_id,
                                     1 /* nrOfLayers */)
                      >> 3;
       coeff_ue[UE_id] = (float) tbs / thr_ue[UE_id];
-      LOG_I(MAC,"b %d, thr_ue[%d] %f, tbs %d, coeff_ue[%d] %f\n",
+      LOG_D(MAC,"b %d, thr_ue[%d] %f, tbs %d, coeff_ue[%d] %f\n",
             b, UE_id, thr_ue[UE_id], tbs, UE_id, coeff_ue[UE_id]);
       /* Create UE_sched list for UEs eligible for new transmission*/
       add_tail_nr_list(&UE_sched, UE_id);
     }
   }
 
+  /* Loop UE_sched to find max coeff and allocate transmission */
+  while (max_num_ue > 0 && n_rb_sched > 0 && UE_sched.head >= 0) {
+
+    /* Find max coeff from UE_sched*/
+    int *max = &UE_sched.head; /* assume head is max */
+    int *p = &UE_sched.next[*max];
+    while (*p >= 0) {
+      /* if the current one has larger coeff, save for later */
+      if (coeff_ue[*p] > coeff_ue[*max])
+        max = p;
+      p = &UE_sched.next[*p];
+    }
+    /* remove the max one: do not use remove_nr_list() it goes through the
+     * whole list every time. Note that UE_sched.tail might not be set
+     * correctly anymore */
+    const int UE_id = *max;
+    p = &UE_sched.next[*max];
+    *max = UE_sched.next[*max];
+    *p = -1;
+
     NR_UE_sched_ctrl_t *sched_ctrl = &UE_info->UE_sched_ctrl[UE_id];
     const uint16_t rnti = UE_info->rnti[UE_id];
     const uint16_t bwpSize = NRRIV2BW(sched_ctrl->active_bwp->bwp_Common->genericParameters.locationAndBandwidth, 275);
     int rbStart = NRRIV2PRBOFFSET(sched_ctrl->active_bwp->bwp_Common->genericParameters.locationAndBandwidth, 275);
 
-  /* Loop UE_sched to find max coeff and allocate transmission */
-  //while(n_rb_sched > 0 && UE_sched.head >= 0){
-  if (sched_ctrl->dl_harq_pid < 0) { // temp
-
-    /* Find max coeff from UE_sched*/
-
     /* Find a free CCE */
     bool freeCCE = find_free_CCE(module_id, slot, UE_id);
     if (!freeCCE) {
       LOG_E(MAC, "%4d.%2d could not find CCE for UE %d/RNTI %04x\n", frame, slot, UE_id, rnti);
-      return;
+      continue;
     }
     /* reduce max_num_ue once we are sure UE can be allocated, i.e., has CCE */
     max_num_ue--;