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Content for  TS 38.300  Word version:  17.1.0

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C  I-RNTI Reference Profilesp. 200

The I-RNTI provides the new NG-RAN node a reference to the UE context in the old NG-RAN node. How the new NG-RAN node is able to resolve the old NG-RAN ID from the I-RNTI is a matter of proper configuration in the old and new NG-RAN node.
Table C-1 below provides some typical partitioning of a 40bit I-RNTI, assuming the following content:
  • UE specific reference: reference to the UE context within a logical NG-RAN node;
  • NG-RAN node address index: information to identify the NG-RAN node that has allocated the UE specific part;
  • PLMN-specific information: information supporting network sharing deployments, providing an index to the PLMN ID part of the Global NG-RAN node identifier.
Profile ID UE specific reference NG-RAN node address index (e.g., gNB ID, eNB ID) RAT-specific information PLMN-specific information Comment
120 bits (~1 million values)20 bits (~1 million values)N/AN/ANG-RAN node address index may be very well represented by the LSBs of the gNB ID.
This profile may be applicable for any NG-RAN RAT.
220 bits (~1 million values)16 bits (65.000 nodes)N/A4 bits (Max 16 PLMNs)Max number of PLMN IDs broadcast in NR is 12.
This profile may be applicable for any NG-RAN RAT.
324 bits (16 million values)16 bits (65.000 nodes)N/AN/AReduced node address to maximise addressable UE contexts.
This profile may be applicable for any NG-RAN RAT.
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D  SPID ranges and mapping of SPID values to cell reselection and inter-RAT/inter frequency handover prioritiesp. 201

The SPID values are defined in Annex I of TS 36.300.
From the SPID reference values, only the SPID=253 also applies for 5GC.

E  NG-RAN Architecture for Radio Access Network Sharing with multiple cell ID broadcastp. 202

Each NG-RAN node serving a cell identified by a Cell Identity associated with either a subset of PLMNs, or a subset of SNPNs, or a subset of PNI-NPNs is connected to another NG-RAN node via a single Xn-C interface instance.
Each Xn-C interface instance is setup and removed individually.
Xn-C interface instances terminating at NG-RAN nodes which share the same physical radio resources may share the same signalling transport resources. If this option is applied:
  • Non-UE associated signalling is associated to an Xn-C interface instance by including an Interface Instance Indication in the XnAP message;
  • Node related, non-UE associated Xn-C interface signalling may provide information destined for multiple logical nodes in a single XnAP procedure instance once the Xn-C interface instance is setup;
  • A UE associated signalling connection is associated to an Xn-C interface instance by allocating values for the corresponding NG-RAN node UE XnAP IDs so that they can be mapped to that Xn-C interface instance.
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F (Normative)  Use and structure of the I-RNTI |R17|p. 202

The I-RNTI provides an NG-RAN node with a reference to the UE context and a reference to the NG-RAN node that allocated the UE context.
To support an NG-RAN node in resolving the Local NG-RAN ID of the NG-RAN node that allocated the UE context, the I-RNTI structure is as follows:
  • the first part (starting from the MSB of the I-RNTI) identifies the I-RNTI profile. It is 2 bits long for a Full I-RNTI or 1 bit long for a short I-RNTI, and it indicates the length of a Local NG-RAN Node Identifier of the NG-RAN Node that allocated the I-RNTI;
  • the second part, immediately following the first part, is a Local NG-RAN Node Identifier;
  • the third part, immediately following the second part, identifies the UE context stored in the NG-RAN node that allocated the I-RNTI.
In case a NG-RAN node takes an additional Local NG-RAN Node identifier into use or removes a Local NG-RAN Node identifier currently in use it informs its neighbor NG-RAN nodes about this change.
The I-RNTI profiles for Full I-RNTI are described in Table F-1.
I-RNTI Profile Identity I-RNTI profile value
(binary encoding)
00b00
10b01
20b10
30b11
The I-RNTI profiles for Short I-RNTI are described in Table F-2.
I-RNTI Profile Identity I-RNTI profile value
(binary encoding)
00b0
10b1
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$  Change historyp. 203


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