Add F1AP positioning activation response message enc/dec + test

Reference: 3GPP 38.473 v16.21.0
Mandatory fields:
gNB-CU UE F1AP ID (supported)
gNB-DU UE F1AP ID (supported)
Optional fields:
System Frame Number (not supported)
Slot Number (not supported)
Criticality Diagnostics (not supported)

openair2/COMMON/f1ap_messages_types.h

@@ -1067,4 +1067,11 @@ typedef struct f1ap_positioning_activation_req_s {
   f1ap_srs_type_t srs_type;
 } f1ap_positioning_activation_req_t;
 
+typedef struct f1ap_positioning_activation_resp_s {
+  // IE 9.3.1.4 (mandatory)
+  uint32_t gNB_CU_ue_id;
+  // IE 9.3.1.5 (mandatory)
+  uint32_t gNB_DU_ue_id;
+} f1ap_positioning_activation_resp_t;
+
 #endif /* F1AP_MESSAGES_TYPES_H_ */

openair2/F1AP/lib/f1ap_positioning.c

@@ -2603,3 +2603,120 @@ void free_positioning_activation_req(f1ap_positioning_activation_req_t *msg)
       break;
   }
 }
+
+/**
+ * @brief Encode F1 positioning activation response to ASN.1
+ */
+F1AP_F1AP_PDU_t *encode_positioning_activation_resp(const f1ap_positioning_activation_resp_t *msg)
+{
+  F1AP_F1AP_PDU_t *pdu = calloc_or_fail(1, sizeof(*pdu));
+
+  /* Message Type */
+  pdu->present = F1AP_F1AP_PDU_PR_successfulOutcome;
+  asn1cCalloc(pdu->choice.successfulOutcome, tmp);
+  tmp->procedureCode = F1AP_ProcedureCode_id_PositioningActivation;
+  tmp->criticality = F1AP_Criticality_reject;
+  tmp->value.present = F1AP_SuccessfulOutcome__value_PR_PositioningActivationResponse;
+  F1AP_PositioningActivationResponse_t *out = &tmp->value.choice.PositioningActivationResponse;
+
+  /* mandatory : GNB_CU_UE_F1AP_ID */
+  asn1cSequenceAdd(out->protocolIEs.list, F1AP_PositioningActivationResponseIEs_t, ie1);
+  ie1->id = F1AP_ProtocolIE_ID_id_gNB_CU_UE_F1AP_ID;
+  ie1->criticality = F1AP_Criticality_reject;
+  ie1->value.present = F1AP_PositioningActivationResponseIEs__value_PR_GNB_CU_UE_F1AP_ID;
+  ie1->value.choice.GNB_CU_UE_F1AP_ID = msg->gNB_CU_ue_id;
+
+  /* mandatory : GNB_DU_UE_F1AP_ID */
+  asn1cSequenceAdd(out->protocolIEs.list, F1AP_PositioningActivationResponseIEs_t, ie2);
+  ie2->id = F1AP_ProtocolIE_ID_id_gNB_DU_UE_F1AP_ID;
+  ie2->criticality = F1AP_Criticality_reject;
+  ie2->value.present = F1AP_PositioningActivationResponseIEs__value_PR_GNB_DU_UE_F1AP_ID;
+  ie2->value.choice.GNB_DU_UE_F1AP_ID = msg->gNB_DU_ue_id;
+
+  return pdu;
+}
+
+/**
+ * @brief Decode F1 positioning activation response
+ */
+bool decode_positioning_activation_resp(const F1AP_F1AP_PDU_t *pdu, f1ap_positioning_activation_resp_t *out)
+{
+  DevAssert(out != NULL);
+  memset(out, 0, sizeof(*out));
+
+  F1AP_PositioningActivationResponse_t *in = &pdu->choice.successfulOutcome->value.choice.PositioningActivationResponse;
+  F1AP_PositioningActivationResponseIEs_t *ie;
+
+  F1AP_LIB_FIND_IE(F1AP_PositioningActivationResponseIEs_t,
+                   ie,
+                   &in->protocolIEs.list,
+                   F1AP_ProtocolIE_ID_id_gNB_CU_UE_F1AP_ID,
+                   true);
+  F1AP_LIB_FIND_IE(F1AP_PositioningActivationResponseIEs_t,
+                   ie,
+                   &in->protocolIEs.list,
+                   F1AP_ProtocolIE_ID_id_gNB_DU_UE_F1AP_ID,
+                   true);
+
+  for (int i = 0; i < in->protocolIEs.list.count; ++i) {
+    ie = in->protocolIEs.list.array[i];
+    AssertError(ie != NULL, return false, "in->protocolIEs.list.array[i] is NULL");
+    switch (ie->id) {
+      case F1AP_ProtocolIE_ID_id_gNB_CU_UE_F1AP_ID:
+        _F1_EQ_CHECK_INT(ie->value.present, F1AP_PositioningActivationResponseIEs__value_PR_GNB_CU_UE_F1AP_ID);
+        out->gNB_CU_ue_id = ie->value.choice.GNB_CU_UE_F1AP_ID;
+        break;
+      case F1AP_ProtocolIE_ID_id_gNB_DU_UE_F1AP_ID:
+        _F1_EQ_CHECK_INT(ie->value.present, F1AP_PositioningActivationResponseIEs__value_PR_GNB_DU_UE_F1AP_ID);
+        out->gNB_DU_ue_id = ie->value.choice.GNB_DU_UE_F1AP_ID;
+        break;
+      case F1AP_ProtocolIE_ID_id_SystemFrameNumber:
+        PRINT_ERROR("F1AP_ProtocolIE_ID_id %ld not handled, skipping\n", ie->id);
+        break;
+      case F1AP_ProtocolIE_ID_id_SlotNumber:
+        PRINT_ERROR("F1AP_ProtocolIE_ID_id %ld not handled, skipping\n", ie->id);
+        break;
+      case F1AP_ProtocolIE_ID_id_CriticalityDiagnostics:
+        PRINT_ERROR("F1AP_ProtocolIE_ID_id %ld not handled, skipping\n", ie->id);
+        break;
+      default:
+        PRINT_ERROR("F1AP_ProtocolIE_ID_id %ld unknown, skipping\n", ie->id);
+        break;
+    }
+  }
+
+  return true;
+}
+
+/**
+ * @brief F1 positioning activation response deep copy
+ */
+f1ap_positioning_activation_resp_t cp_positioning_activation_resp(const f1ap_positioning_activation_resp_t *orig)
+{
+  /* copy all mandatory fields that are not dynamic memory */
+  f1ap_positioning_activation_resp_t cp = {
+      .gNB_CU_ue_id = orig->gNB_CU_ue_id,
+      .gNB_DU_ue_id = orig->gNB_DU_ue_id,
+  };
+
+  return cp;
+}
+
+/**
+ * @brief F1 positioning activation response equality check
+ */
+bool eq_positioning_activation_resp(const f1ap_positioning_activation_resp_t *a, const f1ap_positioning_activation_resp_t *b)
+{
+  _F1_EQ_CHECK_INT(a->gNB_CU_ue_id, b->gNB_CU_ue_id);
+  _F1_EQ_CHECK_INT(a->gNB_DU_ue_id, b->gNB_DU_ue_id);
+
+  return true;
+}
+
+/**
+ * @brief Free Allocated F1 positioning activation response
+ */
+void free_positioning_activation_resp(f1ap_positioning_activation_resp_t *msg)
+{
+  // nothing to free
+}

openair2/F1AP/lib/f1ap_positioning.h

@@ -56,4 +56,11 @@ f1ap_positioning_activation_req_t cp_positioning_activation_req(const f1ap_posit
 bool eq_positioning_activation_req(const f1ap_positioning_activation_req_t *a, const f1ap_positioning_activation_req_t *b);
 void free_positioning_activation_req(f1ap_positioning_activation_req_t *msg);
 
+// positioning activation response
+struct F1AP_F1AP_PDU *encode_positioning_activation_resp(const f1ap_positioning_activation_resp_t *msg);
+bool decode_positioning_activation_resp(const struct F1AP_F1AP_PDU *pdu, f1ap_positioning_activation_resp_t *out);
+f1ap_positioning_activation_resp_t cp_positioning_activation_resp(const f1ap_positioning_activation_resp_t *orig);
+bool eq_positioning_activation_resp(const f1ap_positioning_activation_resp_t *a, const f1ap_positioning_activation_resp_t *b);
+void free_positioning_activation_resp(f1ap_positioning_activation_resp_t *msg);
+
 #endif /* F1AP_POSITIONING_H_ */

openair2/F1AP/tests/f1ap_lib_test.c

@@ -1687,6 +1687,35 @@ static void test_f1ap_positioning_activation_request()
   printf("%s() successful\n", __func__);
 }
 
+static void test_f1ap_positioning_activation_response()
+{
+  f1ap_positioning_activation_resp_t orig = {
+      .gNB_CU_ue_id = 12,
+      .gNB_DU_ue_id = 19,
+      // rest is optional and intentionally left empty
+  };
+  F1AP_F1AP_PDU_t *f1enc = encode_positioning_activation_resp(&orig);
+  F1AP_F1AP_PDU_t *f1dec = f1ap_encode_decode(f1enc);
+  f1ap_msg_free(f1enc);
+
+  f1ap_positioning_activation_resp_t decoded = {0};
+  bool ret = decode_positioning_activation_resp(f1dec, &decoded);
+  AssertFatal(ret, "decode_positioning_activation_resp(): could not decode message\n");
+  f1ap_msg_free(f1dec);
+
+  ret = eq_positioning_activation_resp(&orig, &decoded);
+  AssertFatal(ret, "eq_positioning_activation_resp(): decoded message doesn't match\n");
+  free_positioning_activation_resp(&decoded);
+
+  f1ap_positioning_activation_resp_t cp = cp_positioning_activation_resp(&orig);
+  ret = eq_positioning_activation_resp(&orig, &cp);
+  AssertFatal(ret, "eq_positioning_activation_resp(): copied message doesn't match\n");
+  free_positioning_activation_resp(&orig);
+  free_positioning_activation_resp(&cp);
+
+  printf("%s() successful\n", __func__);
+}
+
 int main()
 {
   test_initial_ul_rrc_message_transfer();
@@ -1717,5 +1746,6 @@ int main()
   test_f1ap_positioning_information_response();
   test_f1ap_positioning_information_failure();
   test_f1ap_positioning_activation_request();
+  test_f1ap_positioning_activation_response();
   return 0;
 }