diff --git a/gmm/handler.go b/gmm/handler.go
index bd6dd444..d8f48719 100644
--- a/gmm/handler.go
+++ b/gmm/handler.go
@@ -626,6 +626,18 @@ func HandleRegistrationRequest(ctx ctxt.Context, ue *context.AmfUe, anType model
 	ue.Location = ue.RanUe[anType].Location
 	ue.Tai = ue.RanUe[anType].Tai
 
+	switch anType {
+	case models.AccessType__3_GPP_ACCESS:
+		switch {
+		case ue.Location.NrLocation != nil:
+			ue.RatType = models.RatType_NR
+		case ue.Location.EutraLocation != nil:
+			ue.RatType = models.RatType_EUTRA
+		}
+	case models.AccessType_NON_3_GPP_ACCESS:
+		ue.RatType = models.RatType_WLAN
+	}
+
 	// Check TAI
 	taiList := make([]models.Tai, len(amfSelf.SupportTaiLists))
 	copy(taiList, amfSelf.SupportTaiLists)
diff --git a/producer/ue_context.go b/producer/ue_context.go
index 9ccd57d3..edb6b26a 100644
--- a/producer/ue_context.go
+++ b/producer/ue_context.go
@@ -134,7 +134,9 @@ func CreateUEContextProcedure(ueContextID string, createUeContextRequest models.
 	ue.UdmGroupId = ueContextCreateData.UeContext.UdmGroupId
 	ue.AusfGroupId = ueContextCreateData.UeContext.AusfGroupId
 	// ueContextCreateData.UeContext.HpcfId
-	ue.RatType = ueContextCreateData.UeContext.RestrictedRatList[0] // minItem = -1
+	// RestrictedRatList contains RAT types the UE cannot use, so it must
+	// not be copied into ue.RatType. RatType is set from the access type
+	// during HandleRegistrationRequest (gmm/handler.go).
 	// ueContextCreateData.UeContext.ForbiddenAreaList
 	// ueContextCreateData.UeContext.ServiceAreaRestriction
 	// ueContextCreateData.UeContext.RestrictedCoreNwTypeList