3GPP Scout / RRC information elements
RRC information element
TDD-UL-DL-ConfigCommon: 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 3 fields (3 in Rel-15)
- Used in
- EarlyUL-SyncConfig, SIB26, SL-ResourcePool, ServingCellConfig, ServingCellConfigCommon, ServingCellConfigCommonSIB
In plain words
It configures the cell-specific time-division duplex (TDD) uplink and downlink: "The IE TDD-UL-DL-ConfigCommon determines the cell specific Uplink/Downlink TDD configuration." Its three fields include referenceSubcarrierSpacing, which sets common time boundaries regardless of data subcarrier spacing, and the field count matches Rel-15.
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.