3GPP Scout / RRC information elements
RRC information element
RACH-ConfigGeneric: the RRC information element in TS 38.331
At a glance
- Specification
- 3GPP TS 38.331 V19.4.0, clause 6.3.2
- Structure
- SEQUENCE with 15 fields (8 in Rel-15, 5 in Rel-16, 1 in Rel-17, 1 in Rel-19)
- Used in
- BeamFailureRecoveryConfig, EarlyUL-SyncConfig, RACH-ConfigCommon, RACH-ConfigDedicated, RACH-ConfigTwoTA, SI-RequestConfig, SI-RequestConfigRepetition, SIB26
In plain words
RACH-ConfigGeneric specifies: "The IE RACH-ConfigGeneric is used to specify the random-access parameters both for regular random access as well as for beam failure recovery." One field counts transmission occasions frequency-multiplexed in a time instance, while another gives the lowest occasion's frequency offset from PRB 0. For beam failure recovery, the configured prach-ConfigurationIndex can only correspond to the short preamble format. The ASN.1 structure has 15 fields: eight from Rel-15, five from Rel-16, and one each from Rel-17 and Rel-19.
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
- 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
- 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.