3GPP 38.300 v19.3.0 — the document's own text
Annex C I-RNTI Reference Profiles
Taught in 6. The three states a device sits in (TSG RAN — the group that specifies the radio, in depth).
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;
NOTE: RAT-specific information may be introduced in a later release, containing information to identify the RAT of the cell within which the UE was sent to RRC_INACTIVE. This version of the specification only supports intra-RAT mobility of UEs in RRC_INACTIVE.
- PLMN-specific information: information supporting network sharing deployments, providing an index to the PLMN ID part of the Global NG-RAN node identifier.
Table C-1: I-RNTI reference profiles
| Profile ID | UE specific reference | NG-RAN node address index (e.g., gNB ID, eNB ID) | RAT-specific information | PLMN-specific information | Comment |
|---|---|---|---|---|---|
| 1 | 20 bits(~1 million values) | 20 bits(~1 million values) | N/A | N/A | NG-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. |
| 2 | 20 bits(~1 million values) | 16 bits(65.000 nodes) | N/A | 4 bits (Max 16 PLMNs) | Max number of PLMN IDs broadcast in NR is 12.This profile may be applicable for any NG-RAN RAT. |
| 3 | 24 bits(16 million values) | 16 bits(65.000 nodes) | N/A | N/A | Reduced node address to maximise addressable UE contexts.This profile may be applicable for any NG-RAN RAT. |