Add some comments on the code and update documentation

2021-12-08 12:21:20 +00:00
parent e0944aa24b
commit 158c309cbc
2 changed files with 9 additions and 3 deletions
@@ -824,13 +824,17 @@ void nr_rx_sdu(const module_id_t gnb_mod_idP,
            ra->Msg4_slot = 1;
            
            if (ra->msg3_dcch_dtch) {
-              // Check if the C-RNTI still exists in the network
+              // Check if the UE identified by C-RNTI still exists at the gNB
              int UE_id_C = find_nr_UE_id(gnb_mod_idP, ra->crnti);
              if (UE_id_C < 0) {
+                // The UE identified by C-RNTI no longer exists at the gNB
+                // Let's abort the current RA, so the UE will trigger a new RA later but using RRCSetupRequest instead. A better solution may be implemented
                mac_remove_nr_ue(gnb_mod_idP, ra->rnti);
                nr_clear_ra_proc(gnb_mod_idP, CC_idP, frameP, ra);
                return;
              } else {
+                // The UE identified by C-RNTI still exists at the gNB
+                // Reset uplink failure flags/counters/timers at MAC and at RRC so gNB will resume again scheduling resources for this UE
                UE_info->UE_sched_ctrl[UE_id_C].pusch_consecutive_dtx_cnt = 0;
                UE_info->UE_sched_ctrl[UE_id_C].ul_failure = 0;
                nr_mac_gNB_rrc_ul_failure_reset(gnb_mod_idP, frameP, slotP, ra->crnti);