diff --git a/33128/r19/TS33128Payloads.asn b/33128/r19/TS33128Payloads.asn
index c3b96c04eba5c3c080f1f40bf6144ec1706343ec..5d6a0965e7a96f55e17c289d2672b33744065f0c 100644
--- a/33128/r19/TS33128Payloads.asn
+++ b/33128/r19/TS33128Payloads.asn
@@ -333,7 +333,14 @@ XIRIEvent ::= CHOICE
     fiveGStartOfInterceptionWithPINClientInPIN          [189] FiveGStartOfInterceptionWithPINClientInPIN,
 
     -- Charging data event records, see clause 7.19
-    chargingDataEvent                                   [190] ChargingDataEvent
+    chargingDataEvent                                   [190] ChargingDataEvent,
+
+    -- MCData events, see clause 7.X.3.2
+    mCDataSIPMessage                                    [191] MCDataSIPMessage,
+    mCDataStartOfInterceptionWithRegisteredUE           [192] MCDataStartOfInterceptionWithRegisteredUE,
+    mCDataStartOfInterceptionWithEstablishedSession     [193] MCDataStartOfInterceptionWithEstablishedSession,
+    mCDataManagementMessage                             [194] MCDataManagementMessage,
+    mCDataFileDistribution                              [195] MCDataFileDistribution
 }
 
 -- ==============
@@ -650,7 +657,14 @@ IRIEvent ::= CHOICE
     fiveGStartOfInterceptionWithPINClientInPIN          [189] FiveGStartOfInterceptionWithPINClientInPIN,
 
     -- Charging data event records, see clause 7.19
-    chargingDataEvent                                   [190] ChargingDataEvent
+    chargingDataEvent                                   [190] ChargingDataEvent,
+
+    -- MCData events, see clause 7.X.3.3
+    mCDataSIPMessage                                    [191] MCDataSIPMessage,
+    mCDataStartOfInterceptionWithRegisteredUE           [192] MCDataStartOfInterceptionWithRegisteredUE,
+    mCDataStartOfInterceptionWithEstablishedSession     [193] MCDataStartOfInterceptionWithEstablishedSession,
+    mCDataManagementMessage                             [194] MCDataManagementMessage,
+    mCDataFileDistribution                              [195] MCDataFileDistribution
 }
 
 IRITargetIdentifier ::= SEQUENCE
@@ -688,7 +702,8 @@ CCPDU ::= CHOICE
     pTCCCPDU            [5] PTCCCPDU,
 
     iMSCCPDU            [6] IMSCCPDU,
-    rCSCCPDU            [7] RCSCCPDU
+    rCSCCPDU            [7] RCSCCPDU,
+    mCDataCCPDU         [8] MCDataCCPDU
 }
 
 -- ===========================
@@ -6073,6 +6088,248 @@ PINServerID ::= UTF8String
 PINClientProfile ::=XMLType
 PINProfile ::= XMLType
 
+-- ==================
+-- MCData definitions
+-- ==================
+
+-- See clause 7.Y.3.2.1 for details of this structure
+
+MCDataSIPMessage ::= SEQUENCE
+{
+    mCDataIdentities   [1] SEQUENCE SIZE (1..MAX) OF MCDataIdentity OPTIONAL,
+    mCDataGroupID      [2] MCDataGroupID OPTIONAL,
+    sIPMessage         [3] SIPMessage,
+    sessionDirection   [4] Direction
+}
+
+-- See clause 7.X.3.2.2 for details of this structure
+
+MCDataStartOfInterceptionWithRegisteredUE ::= SEQUENCE
+{
+    mCDataIdentities              [1] SEQUENCE SIZE (1..MAX) OF MCDataIdentity,
+    userOnline                    [2] BOOLEAN,
+    sIPRegistrationRequest        [3] SIPMessage,
+    sIPRegistrationResponse       [4] SIPMessage,
+    location                      [5] Location OPTIONAL
+}
+
+-- See clause 7.X.3.2.3 for details of this structure
+
+MCDataStartOfInterceptionWithEstablishedSession ::= SEQUENCE
+{
+    mCDataIdentities            [1] SEQUENCE SIZE (1..MAX) OF MCDataIdentity OPTIONAL,
+    mCDataGroupID               [2] MCDataGroupID OPTIONAL,
+    mCDataDirection             [3] Direction,
+    mCDataOriginatingID         [4] MCDataID,
+    mCDataSessionInfo           [5] MCXSessionInfo,
+    mCDataParticipants          [6] SEQUENCE SIZE (1..MAX) OF MCDataID OPTIONAL,
+    location                    [7] Location OPTIONAL,
+    mCDataBearerCapability      [8] UTF8String OPTIONAL
+}
+
+-- See clause 7.X.3.2.4 for details of this structure
+
+MCDataManagementMessage ::= CHOICE
+{
+    mCDataIdMMessage [1] MCDataIdMMessage,
+    mCDataCMMessage  [2] MCDataCMMessage,
+    mCDataGMMessage  [3] MCDataGMMessage,
+    mCDataKMMessage  [4] MCDataKMMessage,
+    mCDataLMMessage  [5] MCDataLMMessage
+}
+
+-- See clause 7.X.3.2.5 for details of this structure
+
+MCDataFileDistribution ::= CHOICE
+{
+    mCDataFileUpload   [1] MCDataFileUpload,
+    mCDataFileDownload [2] MCDataFileDownload
+}
+
+MCDataCCPDU ::= CHOICE
+{
+    encapsulatedMCDataPayload [1] EncapsulatedRCSPayload
+}
+-- =================
+-- MCData parameters
+-- =================
+
+MCDataIdMMessage ::= SEQUENCE
+{
+    mCID       [1] MCID,
+    mCDataID   [2] MCDataID,
+    idMMessage [3] IdMMessage
+}
+
+IdMMessage ::= SEQUENCE
+{
+    idMRequest   [1] OCTET STRING,
+    idMResponse  [2] OCTET STRING
+}
+
+MCDataCMMessage ::= SEQUENCE
+{
+    mCDataIdentities           [1] SEQUENCE SIZE (1..MAX) OF MCDataIdentity,
+    mCDataClient               [2] MCDataID OPTIONAL,
+    hTTPMethod                 [3] CMHTTPMethod,
+    requestURI                 [4] UTF8String,
+    hTTPResponseCode           [5] CMHTTPResponseCode,
+    mCDataUEConfiguration      [6] XMLType OPTIONAL,
+    mCDataUEProfile            [7] XMLType OPTIONAL,
+    mCDataServiceConfiguraiton [8] XMLType OPTIONAL
+}
+
+MCDataGMMessage ::= SEQUENCE
+{
+    mCDataIdentities      [1] SEQUENCE SIZE (1..MAX) OF MCDataIdentity OPTIONAL,
+    mCDataGroupID         [2] MCDataGroupID OPTIONAL,
+    mCDataClient          [3] MCDataID OPTIONAL,
+    gMMessage             [4] GMMessage
+}
+
+GMMessage ::= SEQUENCE
+{
+    gMRequest   [1] OCTET STRING,
+    gMResponse  [2] OCTET STRING
+}
+
+MCDataKMMessage ::= SEQUENCE
+{
+    mCDataID        [1] MCDataID,
+    kMMessage       [2] KMMessage
+}
+
+KMMessage ::= SEQUENCE
+{
+    kMSRequestName          [1] KMSRequestName,
+    kMSRequestBody          [2] KMSRequestBody,
+    kMSResponseBody         [3] KMSResponseBody OPTIONAL,
+    kMSResponseBodyKRR      [4] KMSResponseBodyKRR OPTIONAL,
+    hTTPResponseCode        [5] UTF8String
+}
+
+MCDataLMMessage ::= SEQUENCE
+{
+    mCDataID                [1] MCDataID,
+    lMMessage               [2] LMMessage
+}
+
+LMMessage ::= SEQUENCE
+{
+    lMRequest   [1] OCTET STRING,
+    lMResponse  [2] OCTET STRING
+}
+
+MCDataIdentity ::= CHOICE
+{
+    mCDataID              [1] MCDataID,
+    iMPU                  [2] IMPU,
+    iMPI                  [3] IMPI,
+    instanceIdentifierURN [4] InstanceIdentifierURN
+}
+
+MCID ::= UTF8String
+MCDataID ::= UTF8String
+MCDataGroupID ::= UTF8String
+InstanceIdentifierURN ::= UTF8String
+
+MCXSessionInfo ::= SEQUENCE
+{
+    sessionURI        [1] UTF8String,
+    sessionType       [2] MCXSessionType,
+    groupSessionType  [3] MCXGroupSessionType OPTIONAL,
+    establishmentType [4] MCXEstablishmentType
+}
+
+MCXSessionType ::= ENUMERATED
+{
+    private(1),
+    group(2)
+}
+
+MCXGroupSessionType ::= ENUMERATED
+{
+    chat(1),
+    preArranged(2),
+    adHoc(3)
+}
+
+MCXEstablishmentType ::= ENUMERATED
+{
+    onDemand(1),
+    preEstablished(2)
+}
+
+CMHTTPMethod ::= ENUMERATED
+{
+    gET(1),
+    pUT(2),
+    dELETE(3)
+}
+
+CMHTTPResponseCode ::= ENUMERATED
+{
+    oK200(1),
+    created201(2),
+    notModified304(3),
+    badRequest400(4),
+    unauthorized401(5),
+    forbidden403(6),
+    notFound404(7),
+    methodNotAllowed405(8),
+    conflict409(9),
+    preconditionFailed412(10),
+    unsupportedMediaType415(11),
+    internalServerError500(12)
+}
+
+KMSRequestName ::= ENUMERATED
+{
+    kMSInitialize(1),
+    kMSKeyProvision(2),
+    kMSCert(3),
+    kMSCertCache(4),
+    kMSLookup(5),
+    kMSRedirectUpload(6)
+}
+
+KMSRequestBody ::= CHOICE
+{
+    kMSRequest        [1] XMLType,
+    signedKMSRequest  [2] XMLType
+}
+
+KMSResponseBody ::= CHOICE
+{
+    kMSResponse       [1] XMLType,
+    signedKMSResponse [2] XMLType
+}
+
+KMSResponseBodyKRR ::= XMLType
+
+MCDataFileUpload ::= SEQUENCE
+{
+    mCDataID           [1] MCDataID,
+    mCDataGroupID      [2] MCDataGroupID OPTIONAL,
+    mcDatarequestType  [3] MCDataRequestType,
+    mCDataFileURL      [4] UTF8String OPTIONAL,
+    hTTPResponseCode   [5] UTF8String
+}
+
+MCDataRequestType ::= ENUMERATED
+{
+    oneToOneFD(1),
+    groupFD(2)
+}
+
+MCDataFileDownload ::= SEQUENCE
+{
+    mCDataID           [1] MCDataID,
+    mCDataGroupID      [2] MCDataGroupID OPTIONAL,
+    mCDataFileURL      [3] UTF8String,
+    hTTPResponseCode   [4] UTF8String
+}
+
 -- ===================
 -- 5G LALS definitions
 -- ===================
diff --git a/33128/r19/urn_3GPP_ns_li_3GPPX1Extensions.xsd b/33128/r19/urn_3GPP_ns_li_3GPPX1Extensions.xsd
index c87422949f6196df3e900a76aee8b7921360e990..5938fdf171461f6625e2076ceefa56d2f067d1e9 100644
--- a/33128/r19/urn_3GPP_ns_li_3GPPX1Extensions.xsd
+++ b/33128/r19/urn_3GPP_ns_li_3GPPX1Extensions.xsd
@@ -106,6 +106,27 @@
     <xs:restriction base="xs:string"/>
   </xs:simpleType>
 
+<xs:element name="MCDataLIX1TargetIdentifier" type="MCDataLIX1TargetIdentifier"/>
+<xs:complexType name="MCDataLIX1TargetIdentifier">
+    <xs:choice>
+      <xs:element name="MCID" type="MCID"/>
+      <xs:element name="MCDataID" type="MCDataID"/>
+      <xs:element name="MCDataGroupID" type="MCDataGroupID"/>
+    </xs:choice>
+  </xs:complexType>
+
+  <xs:simpleType name="MCID">
+    <xs:restriction base="xs:string"/>
+  </xs:simpleType>
+
+  <xs:simpleType name="MCDataID">
+    <xs:restriction base="xs:string"/>
+  </xs:simpleType>
+
+  <xs:simpleType name="MCDataGroupID">
+    <xs:restriction base="xs:string"/>
+  </xs:simpleType>
+
   <xs:element name="IdentifierAssociationExtensions" type="IdentifierAssociationExtensions"/>
 
   <xs:complexType name="X1Extension">