3GPP Scout / RRC information elements

RRC information element

RACH-ConfigGenericTwoStepRA: 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 9 fields (8 in Rel-16, 1 in Rel-17)
Used in
RACH-ConfigCommonTwoStepRA, RACH-ConfigDedicated

In plain words

RACH-ConfigGenericTwoStepRA is an information element used to "specify the 2-step random access type parameters.". In TS 38.331 V19.4.0, its sequence has 9 fields: 8 from Rel-16 and 1 added in Rel-17. Its fields configure MsgA PRACH and preamble settings, plus the MsgB response window and preamble transmission limit, and it is referenced by RACH-ConfigCommonTwoStepRA and RACH-ConfigDedicated.

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.