Implement F1 UE Ctxt HandoverPrepInfo in F1

Implement the HandoverPreparationInformation F1AP forwarding logic, and
add it to the F1 internal representation structure.

No logic is implemented in this commit.
Co-authored-by: batuhanduyuler <batuhan.duyuler@firecell.io>
Co-authored-by: rmagueta <rmagueta@allbesmart.pt>

openair2/COMMON/f1ap_messages_types.h

@@ -442,6 +442,8 @@ typedef struct cu_to_du_rrc_information_s {
   uint32_t   uE_CapabilityRAT_ContainerList_length;
   uint8_t * measConfig;
   uint32_t   measConfig_length;
+  uint8_t *handoverPreparationInfo;
+  uint32_t handoverPreparationInfo_length;
 }cu_to_du_rrc_information_t;
 
 typedef struct du_to_cu_rrc_information_s {

openair2/F1AP/f1ap_cu_ue_context_management.c

@@ -276,6 +276,21 @@ int CU_send_UE_CONTEXT_SETUP_REQUEST(sctp_assoc_t assoc_id, f1ap_ue_context_setu
       OCTET_STRING_fromBuf(measConfig, (const char*)f1ap_ue_context_setup_req->cu_to_du_rrc_information->measConfig,
         f1ap_ue_context_setup_req->cu_to_du_rrc_information->measConfig_length);
     }
+
+    /* optional */
+    /* HandoverPreparationInformation */
+    if (f1ap_ue_context_setup_req->cu_to_du_rrc_information->handoverPreparationInfo_length > 0) {
+      DevAssert(f1ap_ue_context_setup_req->cu_to_du_rrc_information->handoverPreparationInfo != NULL);
+      F1AP_ProtocolExtensionContainer_10696P60_t *p = calloc(1, sizeof(*p));
+      ie6->value.choice.CUtoDURRCInformation.iE_Extensions = (struct F1AP_ProtocolExtensionContainer *)p;
+      asn1cSequenceAdd(p->list, F1AP_CUtoDURRCInformation_ExtIEs_t, ie_ext);
+      ie_ext->id = F1AP_ProtocolIE_ID_id_HandoverPreparationInformation;
+      ie_ext->criticality = F1AP_Criticality_ignore;
+      ie_ext->extensionValue.present = F1AP_CUtoDURRCInformation_ExtIEs__extensionValue_PR_HandoverPreparationInformation;
+      OCTET_STRING_fromBuf(&ie_ext->extensionValue.choice.HandoverPreparationInformation,
+                           (const char *)f1ap_ue_context_setup_req->cu_to_du_rrc_information->handoverPreparationInfo,
+                           f1ap_ue_context_setup_req->cu_to_du_rrc_information->handoverPreparationInfo_length);
+    }
   }
 
   /* optional */

openair2/F1AP/f1ap_du_ue_context_management.c

@@ -171,12 +171,34 @@ int DU_handle_UE_CONTEXT_SETUP_REQUEST(instance_t instance, sctp_assoc_t assoc_i
       F1AP_ProtocolIE_ID_id_CUtoDURRCInformation, false);
   if(ieCuRrcInfo!=NULL){
     f1ap_ue_context_setup_req->cu_to_du_rrc_information = (cu_to_du_rrc_information_t *)calloc(1,sizeof(cu_to_du_rrc_information_t));
-    if(ieCuRrcInfo->value.choice.CUtoDURRCInformation.uE_CapabilityRAT_ContainerList!=NULL){
-      f1ap_ue_context_setup_req->cu_to_du_rrc_information->uE_CapabilityRAT_ContainerList = (uint8_t *)calloc(1,ieCuRrcInfo->value.choice.CUtoDURRCInformation.uE_CapabilityRAT_ContainerList->size);
-      memcpy(f1ap_ue_context_setup_req->cu_to_du_rrc_information->uE_CapabilityRAT_ContainerList, ieCuRrcInfo->value.choice.CUtoDURRCInformation.uE_CapabilityRAT_ContainerList->buf, ieCuRrcInfo->value.choice.CUtoDURRCInformation.uE_CapabilityRAT_ContainerList->size);
-      f1ap_ue_context_setup_req->cu_to_du_rrc_information->uE_CapabilityRAT_ContainerList_length = ieCuRrcInfo->value.choice.CUtoDURRCInformation.uE_CapabilityRAT_ContainerList->size;
+    cu_to_du_rrc_information_t *cu2du = f1ap_ue_context_setup_req->cu_to_du_rrc_information;
+    const F1AP_CUtoDURRCInformation_t *cu2duie = &ieCuRrcInfo->value.choice.CUtoDURRCInformation;
+    if(cu2duie->uE_CapabilityRAT_ContainerList!=NULL){
+      cu2du->uE_CapabilityRAT_ContainerList = calloc(1, cu2duie->uE_CapabilityRAT_ContainerList->size);
+      memcpy(cu2du->uE_CapabilityRAT_ContainerList,
+             cu2duie->uE_CapabilityRAT_ContainerList->buf,
+             cu2duie->uE_CapabilityRAT_ContainerList->size);
+      cu2du->uE_CapabilityRAT_ContainerList_length = cu2duie->uE_CapabilityRAT_ContainerList->size;
       LOG_D(F1AP, "Size f1ap_ue_context_setup_req->cu_to_du_rrc_information->uE_CapabilityRAT_ContainerList_length: %d \n", f1ap_ue_context_setup_req->cu_to_du_rrc_information->uE_CapabilityRAT_ContainerList_length);
     }
+    if (cu2duie->iE_Extensions != NULL) {
+      const F1AP_ProtocolExtensionContainer_10696P60_t *ext = (const F1AP_ProtocolExtensionContainer_10696P60_t *)cu2duie->iE_Extensions;
+      for (int i = 0; i < ext->list.count; ++i) {
+        const F1AP_CUtoDURRCInformation_ExtIEs_t *cu2du_info = ext->list.array[i];
+        switch (cu2du_info->id) {
+          case F1AP_ProtocolIE_ID_id_HandoverPreparationInformation:
+            DevAssert(cu2du_info->extensionValue.present == F1AP_CUtoDURRCInformation_ExtIEs__extensionValue_PR_HandoverPreparationInformation);
+            const F1AP_HandoverPreparationInformation_t *hopi = &cu2du_info->extensionValue.choice.MeasurementTimingConfiguration;
+            cu2du->handoverPreparationInfo = calloc_or_fail(1, hopi->size);
+            memcpy(cu2du->handoverPreparationInfo, hopi->buf, hopi->size);
+            cu2du->handoverPreparationInfo_length = hopi->size;
+            break;
+          default:
+            LOG_W(F1AP, "unsupported CUtoDURRCInformation_ExtIE %ld encountered, ignoring\n", cu2du_info->id);
+            break;
+        }
+      }
+    }
   }
 
   /* DRB */

openair2/RRC/NR/mac_rrc_dl_f1ap.c

@@ -79,8 +79,8 @@ static void ue_context_setup_request_f1ap(sctp_assoc_t assoc_id, const f1ap_ue_c
     AssertFatal(f1ap_msg->cu_to_du_rrc_information != NULL, "out of memory\n");
     AssertFatal(req->cu_to_du_rrc_information->cG_ConfigInfo == NULL && req->cu_to_du_rrc_information->cG_ConfigInfo_length == 0, "cg_ConfigInfo not implemented\n");
     AssertFatal(req->cu_to_du_rrc_information->measConfig == NULL && req->cu_to_du_rrc_information->measConfig_length == 0, "cg_ConfigInfo not implemented\n");
-    if (req->cu_to_du_rrc_information->uE_CapabilityRAT_ContainerList != NULL) {
     const cu_to_du_rrc_information_t *du2cu_req = req->cu_to_du_rrc_information;
+    if (req->cu_to_du_rrc_information->uE_CapabilityRAT_ContainerList != NULL) {
       cu_to_du_rrc_information_t* du2cu_new = f1ap_msg->cu_to_du_rrc_information;
       DevAssert(du2cu_req->uE_CapabilityRAT_ContainerList_length > 0);
       du2cu_new->uE_CapabilityRAT_ContainerList_length = du2cu_req->uE_CapabilityRAT_ContainerList_length;
@@ -88,6 +88,13 @@ static void ue_context_setup_request_f1ap(sctp_assoc_t assoc_id, const f1ap_ue_c
       AssertFatal(du2cu_new->uE_CapabilityRAT_ContainerList != NULL, "out of memory\n");
       memcpy(du2cu_new->uE_CapabilityRAT_ContainerList, du2cu_req->uE_CapabilityRAT_ContainerList, du2cu_new->uE_CapabilityRAT_ContainerList_length);
     }
+    if (req->cu_to_du_rrc_information->handoverPreparationInfo != NULL) {
+      cu_to_du_rrc_information_t *du2cu_new = f1ap_msg->cu_to_du_rrc_information;
+      DevAssert(du2cu_req->handoverPreparationInfo_length > 0);
+      du2cu_new->handoverPreparationInfo_length = du2cu_req->handoverPreparationInfo_length;
+      du2cu_new->handoverPreparationInfo = malloc_or_fail(du2cu_new->handoverPreparationInfo_length);
+      memcpy(du2cu_new->handoverPreparationInfo, du2cu_req->handoverPreparationInfo, du2cu_new->handoverPreparationInfo_length);
+    }
   }
   if (req->drbs_to_be_setup_length > 0) {
     int n = req->drbs_to_be_setup_length;