diff --git a/yang-models/_3gpp-nr-nrm-gnbdufunction.yang b/yang-models/_3gpp-nr-nrm-gnbdufunction.yang
index 5f9de8da5907b7654971ac0cc27d14eaf4778161..dbe33633111d6f227251d590708653b8e07c2315 100755
--- a/yang-models/_3gpp-nr-nrm-gnbdufunction.yang
+++ b/yang-models/_3gpp-nr-nrm-gnbdufunction.yang
@@ -18,6 +18,7 @@ module _3gpp-nr-nrm-gnbdufunction {
     TTA, TTC). All rights reserved.";
   reference "3GPP TS 28.541 5G Network Resource Model (NRM)";
 
+  revision 2025-08-15 { reference "CR-1598"; }
   revision 2025-05-07 { reference "CR-1527 CR-1548"; }
   revision 2025-02-05 { reference CR-1441; }
   revision 2024-02-24 { reference CR-1218; } 
@@ -216,6 +217,10 @@ module _3gpp-nr-nrm-gnbdufunction {
         NRECMappingRule contained by parent, e.g. ManagedElement or
         SubNetwork, applies.";
     }
+    leaf iABRef {
+      type types3gpp:DistinguishedName;
+      description "DN of the referenced IAB." ;     
+    }
 
   }
 
diff --git a/yang-models/_3gpp-nr-nrm-iabfunction.yang b/yang-models/_3gpp-nr-nrm-iabfunction.yang
new file mode 100644
index 0000000000000000000000000000000000000000..12592ba498c406202cd9e263dde2aa917d8414b5
--- /dev/null
+++ b/yang-models/_3gpp-nr-nrm-iabfunction.yang
@@ -0,0 +1,205 @@
+module _3gpp-nr-nrm-iabfunction {
+  yang-version 1.1;
+  namespace "urn:3gpp:sa5:_3gpp-nr-nrm-iabfunction";
+  prefix "iab3gpp";
+
+  import ietf-inet-types { prefix inet; }
+  import _3gpp-common-yang-types { prefix types3gpp; }
+  import _3gpp-common-top { prefix top3gpp; }
+  import _3gpp-5g-common-yang-types { prefix types5g3gpp; }
+  import _3gpp-common-managed-element { prefix me3gpp; }
+  import _3gpp-common-subnetwork { prefix subnet3gpp; }
+
+  organization "3gpp SA5";
+  contact "https://www.3gpp.org/DynaReport/TSG-WG--S5--officials.htm?Itemid=464";
+  description "This IOC represents the IAB function defined in 3GPP TS 28.541.
+  Copyright 2025, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI,
+  TTA, TTC). All rights reserved.";
+  reference "3GPP TS 28.541; 3GPP TS 28.314; 3GPP TS 28.315; 3GPP TS 33.310,
+    IETF RFC 9811";
+
+  revision 2025-08-15 { reference "CR-1598"; }
+
+  grouping CaraConfigurationGrp {
+    description "This data type represents the configuration used for mobile 
+    NR node (e.g., IAB-node) to perform certificate enrolment procedure with
+    Certification Authority server (CA/RA) as specified in TS 28.315 clause 5.3";
+    
+    leaf caraAddress {
+      type inet:host;
+      description "IP address or FQDN of CA/RA server";
+    }
+
+    leaf portNumber {
+        type inet:port-number;     
+        description "This parameter specifies the port number used by 
+        CMP (Certificate Management Protocol) server. The port for HTTP/HTTPSs 
+        transfer of CMP messages is not explicitly given in RFC 9811, therefore
+        this parameter is required. The port number is usually 
+        represented as 2 octets.";
+    }
+    
+    leaf path {
+        type inet:uri;
+        mandatory true;        
+        description "This parameter specifies the path (in ASCII string) to 
+          the CMP server directory. A CMP server may be located in an 
+          arbitrary path other than root.";
+    }
+
+    leaf subjectName {
+        type string;
+        mandatory true;        
+        description "This parameter specifies the subject name (in ASCII 
+          string) of the CA/RA. The use is described in 3GPP TS 33.310
+          clause 9.5.3.";
+    }
+
+    leaf protocol {
+        type enumeration {
+          enum HTTP;
+          enum HTTPS;
+        }
+        description "This parameter specifies the protocol (HTTP or HTTPS) 
+          to be used for certificate enrolment. The use is described in 
+          3GPP TS 33.310 clause 9.6.";
+    }
+  }
+  
+  grouping MnrOamIPConfigGrp { 
+    description "This data type includes the configutation for OAM connectivity  
+      used for mobile NR node (e.g., IAB-node) to establish connection with
+      management system. The configuration attributes include: 
+      Configuration of certification authority (CA/RA) server, 
+      Configuration of security gateway (SeGW), and 
+      Configuration of software configuration server (SCS)";
+    
+    list caraConfiguration {
+      description "configuration used for mobile NR node (e.g., IAB-node)
+        to perform certificate enrolment procedure as specified in TS 28.315.";
+      uses CaraConfigurationGrp;
+      max-elements 1;
+      key caraAddress; 
+    }
+
+    leaf seGwConfiguration {
+      description "configuration of security
+        gateway (SeGW) used for mobile NR node (e.g., IAB-node) to establish
+         secure connection as specified in TS 28.315.";
+      type inet:host;
+
+    }
+
+    leaf scsConfiguration {
+      description "configuration of software 
+        configuration server (SCS) used for mobile NR node (e.g., IAB-node)
+         to establish connection to SCS as specified in TS 28.315.";        
+      type inet:host; 
+    }
+  }
+
+  grouping LocationInfoGrp {
+    description "This data type contains location information 
+      of mobile NR node (e.g., IAB-node).";
+    
+    leaf gNBId {
+      type int64 { range "0..4294967295"; }
+      description "It is either the gNB ID of the IAB-donor-CU that target IAB-DU
+      connects to or the gNB Id of the IAB-nonor-CU that serves IAB-MT";
+    }
+
+    list pLMNId {
+      uses types3gpp:PLMNId;
+      max-elements 1;
+      description "The PLMN ID where IAB-MT or MWAB-UE is connected to";
+      key "mcc mnc";
+    }
+
+    leaf cellLocalId {
+      type int32 { range "0..16383"; }
+      description "Identifies an NR cell where IAB-MT or MWAB-UE 
+      is connected to.";
+    }
+
+    leaf nRTAC {
+      type types5g3gpp:NRTAC;
+      description "It is TAC pertaining to the cells where IAB-MT or MWAB-UE is 
+        connected.";
+    }
+
+    list tAI {
+      uses types3gpp:TaiGrp;
+      key idx;
+      leaf idx { type string; }
+      max-elements 1; 
+      description "It is the TAI (see subclause 9.3.3.11 in TS 38.413) pertaining
+        to the cells where IAB-MT or MWAB-UE is connected";
+    }
+    list geoArea {
+      uses types3gpp:GeoAreaGrp;
+      key idx;
+      leaf idx {type string;}
+      max-elements 1;       
+      description "It specifies geographical area of mobile NR node
+      (e.g., IAB-node or MWAB).";
+    }
+  }
+
+  grouping IABGrp {
+    description "IAB-node architecture is specified in TS 38.401. This IOC
+     defines the configuration information for the IAB management, it is name 
+     contained by SubNetwork or ManagedElement";
+
+    list mnrOamIPConfig  {
+      description "It is IP configutation for OAM connectivity used IAB-node 
+      to establish connection with management system as specified
+       in TS 28.314[x] clause 6.1.2";
+
+      key id;
+      leaf id { type uint32; }
+      uses MnrOamIPConfigGrp ;
+    }
+
+    list locationInfo {
+      description "It is Location information of IAB-node that is used for 
+      IAB-node OAM connection and IAB configuration as specified in
+       TS 28.314 clause 6.1.2 and TS 28.531 clause 5.1.27";
+
+      key id;
+      leaf id { type uint32; }
+      uses LocationInfoGrp;
+    }
+  }
+    grouping IabSubTree {
+    description "Contains classes that manage IAB function management";
+
+    list IAB  {
+      description "IAB-node architecture is specified in TS 38.401. 
+      This IOC defines the configuration information for the IAB management";
+
+      key id;
+      uses top3gpp:Top_Grp ;
+      container attributes {
+        uses IABGrp ;
+      }
+    }
+  }
+
+  feature IABUnderManagedElement {
+    description "The IAB shall be available under ManagedElement";
+  }
+
+  augment /me3gpp:ManagedElement {
+    if-feature IABUnderManagedElement;
+    uses IabSubTree;
+  }
+  
+  feature IABUnderSubNetwork {
+    description "The IAB shall be available under SubNetwork";
+  }
+
+  augment /subnet3gpp:SubNetwork {
+    if-feature IABUnderSubNetwork;
+    uses IabSubTree;
+  } 
+}
\ No newline at end of file