3GPP Scout / RRC information elements

RRC information element

SSB-MTC: the RRC information element in TS 38.331

Published 2026-11-05Updated 2026-10-16

At a glance

Specification
3GPP TS 38.331 V19.4.0, clause 6.3.2
Structure
SEQUENCE with 2 fields (2 in Rel-15)
Used in
CellGroupConfig, MeasIdleConfig, MeasObjectNR, OtherConfig, SIB19, SIB2, SIB4, ServingCellConfig

In plain words

TS 38.331 describes the SSB-MTC information element (IE) this way: "The IE SSB-MTC is used to configure measurement timing configurations, i.e., timing occasions at which the UE measures SSBs.". Its periodicity and offset set when the measurement window occurs, and its duration sets how long the window lasts for receiving SS/PBCH blocks. In TS 38.331 V19.4.0, SSB-MTC is a SEQUENCE with two fields, the same count as in Rel-15: periodicityAndOffset and duration.

Source: 3GPP TS 38.331 V19.4.0, clause 6.3.2. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/38_series/38.331/38331-j40.zip

Sources

  1. 3GPP TS 38.331 V19.4.0, clause 6.3.2. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/38_series/38.331/38331-j40.zip
  2. ASN.1 definition in the same clause, counted by 3GPP Scout.

How this page was made

The facts box comes straight from the 3GPP TDoc list and specification archive as indexed by 3GPP Scout. An AI model (GPT-6 Luna) wrote the paragraph and named the source of each sentence. Code checked every quote word for word against the stored source text and every number against the cited source. A second AI model from another company (Claude Opus 5.5) reviewed the paragraph against the same sources. The 3GPP documents themselves govern.