3GPP Scout / RRC information elements
RRC information element
SIB4: the RRC information element in TS 38.331
At a glance
- Specification
- 3GPP TS 38.331 V19.4.0, clause 6.3.1
- Structure
- SEQUENCE with 9 fields (2 in Rel-15, 1 in Rel-16, 4 in Rel-17, 1 in Rel-18, 1 in Rel-19)
In plain words
SIB4 contains information for inter-frequency cell reselection, including other New Radio (NR) frequencies and neighbouring cells, "which can also be used for NR idle/inactive measurements." Its ASN.1 SEQUENCE has nine fields: two from Rel-15, then one, four, one, and one added across Rel-16 to Rel-19.
Source: 3GPP TS 38.331 V19.4.0, clause 6.3.1. © 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 6.3.1. © 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.