ShortMAC-I

RRC IE · TS 38.331 v19.4.0 (2026-09) · clause 6.3.2

ShortMAC-I is an RRC information element of 3GPP TS 38.331 (38331), the 5G NR Radio Resource Control (RRC) protocol.

First seen v15.1.0 (2018-04) · Last changed v15.3.0 (2018-09)

Definition

The IE ShortMAC-I is used to identify and verify the UE at RRC connection re-establishment. The 16 least significant bits of the MAC-I calculated using the AS security configuration of the source PCell, as specified in 5.3.7.4.

ShortMAC-I ::=                      BIT STRING (SIZE (16))

Used by (3)

• ReestabNCellInfo
• ReestabUE-Identity
• ReestablishmentInfo

In the viewer

• Read ShortMAC-I in v19.4.0
• History of ShortMAC-I across versions
• All versions of TS 38.331
• ASN.1 index