3GPP Scout / RRC information elements

RRC information element

ServCellIndex: 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
A single INTEGER value
Used in
ApplicabilityReportList, CSI-RS-ResourceConfigMobility, CSI-ReportConfig, CandidateBeamRS, CellGroupConfig, CrossCarrierSchedulingConfig, DownlinkPreemption, FrequencyInfoDL and 26 more

In plain words

ServCellIndex is "used to uniquely identify a serving cell (i.e. the PCell, the PSCell or an SCell) across the cell groups.". In TS 38.331 V19.4.0, it is one INTEGER value with no fields, referenced by information elements such as CSI-ReportConfig and CellGroupConfig.

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.