diff --git a/103221-1/TS_103_221_01_Configuration.xsd b/103221-1/TS_103_221_01_Configuration.xsd
index bf70c9e020f1421fa863544d3046f341e98cd414..37ca6572bf8bffeba1917c50bf7c45fcc85c8cad 100644
--- a/103221-1/TS_103_221_01_Configuration.xsd
+++ b/103221-1/TS_103_221_01_Configuration.xsd
@@ -22,7 +22,7 @@
             <xs:element name="keepaliveEnabled" type="xs:boolean"/>
             <xs:element name="keepaliveTimeP1" type="KeepaliveTimeP1" minOccurs="0"/>
             <xs:element name="keepaliveTimeP2" type="KeepaliveTimeP2" minOccurs="0"/>
-        </xs:sequence>
+            <xs:element name="keepaliveTimeP3" type="KeepaliveTimeP3" minOccurs="0"/>
     </xs:complexType>
     <xs:simpleType name="Time1RequestTimeout">
         <xs:restriction base="xs:integer">
@@ -44,5 +44,10 @@
             <xs:minInclusive value="1"/>
         </xs:restriction>
     </xs:simpleType>        
+    <xs:simpleType name="KeepaliveTimeP3">
+        <xs:restriction base="xs:integer">
+            <xs:minInclusive value="0"/>
+        </xs:restriction>
+    </xs:simpleType>        
 </xs:schema>
     
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