IE Dictionary (Information Element)¶
A dictionary for looking up the key information elements (IEs) carried in signaling Messages by their meaning, appearing Message, and purpose.
Related: Message Dictionary / NAS Dictionary / NGAP Dictionary / Registration chapter
IE list¶
| IE | Layer | Meaning | Message it mainly appears in | Purpose/Notes | Spec |
|---|---|---|---|---|---|
| 5GS Registration Type | NAS/5GMM | Registration type (initial/mobility/periodic/emergency) | Registration Request | Indicates the purpose of registration. Encoding to be confirmed | TS 24.501 |
| 5GS Mobile Identity | NAS/5GMM | UE identity (carries SUCI/5G-GUTI/IMEI, etc.) | Registration Request, etc. | The content changes depending on which identifier it carries. Encoding to be confirmed | TS 24.501 |
| UE Security Capability | NAS/5GMM | Ciphering/integrity algorithms (NEA/NIA) the UE supports | Registration Request / Security Mode | Basis for algorithm selection. Encoding to be confirmed | TS 24.501 |
| Requested NSSAI | NAS/5GMM | The set of slices the UE requests | Registration Request | Presents the requested slices. Encoding to be confirmed | TS 24.501 / TS 23.501 |
| Allowed NSSAI | NAS/5GMM | The set of slices the NW permits | Registration Accept | Notifies the slices the NW has permitted. Encoding to be confirmed | TS 24.501 |
| 5G-GUTI | NAS/5GMM | The temporary identifier being assigned | Registration Accept, etc. | Assignment of the temporary identifier. Encoding to be confirmed | TS 24.501 |
| PDU Session Identity | NAS/5GSM | PDU session identification | PDU Session Establishment family | Identifies the session. Encoding to be confirmed | TS 24.501 |
| PDU Session Type | NAS/5GSM | IPv4/IPv6/IPv4v6/Ethernet/Unstructured | PDU Session Establishment family | Specifies the session type. Encoding to be confirmed | TS 24.501 |
| S-NSSAI | NAS/5GSM | The slice for the session in question | PDU Session Establishment family | The slice the session is bound to. Encoding to be confirmed | TS 24.501 / TS 23.501 |
| DNN | NAS/5GSM | Destination data network name | PDU Session Establishment family | Specifies the destination data network. Encoding to be confirmed | TS 24.501 |
| QoS Rules / QoS Flow Description | NAS/5GSM | QoS rules notified to the UE | PDU Session Establishment family | Details in the QoS Dictionary. Encoding to be confirmed | TS 24.501 |
| PDU Session Resource Setup Request List | NGAP | Requests DRB/resource setup over N2 | PDU Session Resource Setup Request family | Resource setup request on the N2 side. Encoding to be confirmed | TS 38.413 |
| UE Aggregate Maximum Bit Rate | NGAP | Maximum aggregate bit rate per UE | Initial Context Setup family | Notifies the per-UE AMBR. Encoding to be confirmed | TS 38.413 |
| Cause | NGAP/NAS | Failure/release reason | Various Reject/Release families | Details in the Cause Dictionary. Encoding to be confirmed | TS 38.413 / TS 24.501 |
Grasp IEs conceptually
The exact encoding of IEs (IEI/length/bit layout) follows the relevant chapters of TS 24.501 (NAS) / TS 38.413 (NGAP). This dictionary is for grasping conceptually "which Message carries which IE and for what purpose". For details, refer to each Protocol dictionary and the Spec Dictionary.