SDAP Entity reconfiguration at UE according to TS 37.324

- triggered by RRC reconfiguration events according to clause 5.3.5.6.5 of TS 38.331
- This procedure does QoS flow to DRB mapping according to clause 5.3.1 of TS 37.324
- QoS flows to DRBs to be released are also handled

openair2/LAYER2/nr_pdcp/nr_pdcp_oai_api.c

@@ -1166,10 +1166,10 @@ void nr_pdcp_reconfigure_drb(ue_id_t ue_id, int drb_id, NR_PDCP_Config_t *pdcp_c
       }
     }
   }
-  if (sdap_config) {
+  /* SDAP entity reconfiguration */
-    // nr_reconfigure_sdap_entity
+  if (sdap_config)
-    AssertFatal(false, "Function to reconfigure SDAP entity not implemented yet\n");
+    nr_reconfigure_sdap_entity(sdap_config, ue_id, sdap_config->pdu_Session, drb_id);
-  }
+
   nr_pdcp_manager_unlock(nr_pdcp_ue_manager);
 }
 

openair2/RRC/NR_UE/rrc_UE.c

@@ -1237,8 +1237,6 @@ static void nr_rrc_ue_process_RadioBearerConfig(NR_UE_RRC_INST_t *ue_rrc,
         /* PDCP and SDAP reconfiguration */
         if (drb->pdcp_Config || sdap_Config)
           nr_pdcp_reconfigure_drb(ue_rrc->ue_id, DRB_id, drb->pdcp_Config, sdap_Config);
-        if (drb->cnAssociation)
-          AssertFatal(drb->cnAssociation->choice.sdap_Config == NULL, "SDAP reconfiguration not yet implemented\n");
       } else {
         ue_rrc->status_DRBs[DRB_id] = RB_ESTABLISHED;
         add_drb(false,

openair2/SDAP/nr_sdap/nr_sdap_entity.c

@@ -641,3 +641,43 @@ bool nr_sdap_delete_ue_entities(ue_id_t ue_id)
   }
   return ret;
 }
+
+/**
+ * @brief SDAP Entity reconfiguration at UE according to TS 37.324
+ *        and triggered by RRC reconfiguration events according to clause 5.3.5.6.5 of TS 38.331.
+ *        This function performs:
+ *        - QoS flow to DRB mapping according to clause 5.3.1 of TS 37.324
+ */
+void nr_reconfigure_sdap_entity(NR_SDAP_Config_t *sdap_config, ue_id_t ue_id, int pdusession_id, int drb_id)
+{
+  bool is_gnb = false;
+  /* fetch SDAP entity */
+  nr_sdap_entity_t *sdap_entity = nr_sdap_get_entity(ue_id, pdusession_id);
+  AssertError(sdap_entity != NULL,
+              return,
+              "Could not find SDAP Entity for RNTI/UE ID: %lu and PDU SESSION ID: %d\n",
+              ue_id,
+              pdusession_id);
+  /* QFI to DRB mapping */
+  NR_QFI_t *mappedQFIs2Add = (NR_QFI_t *)sdap_config->mappedQoS_FlowsToAdd->list.array[0];
+  uint8_t mappedQFIs2AddCount = sdap_config->mappedQoS_FlowsToAdd->list.count;
+  bool has_sdap_rx = is_sdap_rx(is_gnb, sdap_config);
+  bool has_sdap_tx = is_sdap_tx(is_gnb, sdap_config);
+  nr_sdap_ue_qfi2drb_config(sdap_entity,
+                            sdap_entity->default_drb,
+                            ue_id,
+                            mappedQFIs2Add,
+                            mappedQFIs2AddCount,
+                            drb_id,
+                            has_sdap_rx,
+                            has_sdap_tx);
+  /* handle QFIs to DRB mapping rule to release */
+  if (sdap_config->mappedQoS_FlowsToRelease) {
+    NR_QFI_t *mappedQFIs2release = (NR_QFI_t *)sdap_config->mappedQoS_FlowsToRelease->list.array[0];
+    uint8_t mappedQFIs2RemoveCount = sdap_config->mappedQoS_FlowsToRelease->list.count;
+    for(int i = 0; i < mappedQFIs2RemoveCount; i++){
+      uint8_t qfi = mappedQFIs2release[i];
+      sdap_entity->qfi2drb_map_delete(sdap_entity, qfi);
+    }
+  }
+}

openair2/SDAP/nr_sdap/nr_sdap_entity.h

@@ -205,4 +205,10 @@ bool is_sdap_rx(bool is_gnb, NR_SDAP_Config_t *sdap_config);
  */
 bool is_sdap_tx(bool is_gnb, NR_SDAP_Config_t *sdap_config);
 
+/**
+ * @brief               Run the SDAP reconfiguration for the DRB
+ * @param[in] ue_id     Unique identifier for the User Equipment. ID Range [0, 65536].
+ */
+void nr_reconfigure_sdap_entity(NR_SDAP_Config_t *sdap_config, ue_id_t ue_id, int pdusession_id, int drb_id);
+
 #endif