Specification
3GPP TS 38.331: NR; Radio Resource Control (RRC) protocol specification
At a glance
- Title
- NR; Radio Resource Control (RRC) protocol specification
- Newest version
- V19.4.0 (Rel-19)
- Versions indexed
- 9
- Newest per release
- Rel-15: V15.30.0 (2025-10-10); Rel-16: V16.22.0 (2026-06-30); Rel-17: V17.18.0 (2026-09-27); Rel-18: V18.11.0 (2026-09-27); Rel-19: V19.4.0 (2026-09-27)
In plain words
TS 38.331 defines its scope as "The present document specifies the Radio Resource Control protocol for the radio interface between UE and NG-RAN.". The RRC protocol also configures the radio interface between an IAB-node and its parent node, and between an NCR-node and gNB. Its newest version, V19.4.0, includes CR subjects on Early implementation of R19 (e)RedCap UE capability with FR1-NTN and Correction on L1 measurement logging in SHR.
Source: 3GPP TS 38.331 V19.4.0, clause 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
Newest version in each release
| Release | Newest version | In the archive | TSG meeting |
|---|---|---|---|
| Rel-19 | V19.4.0 | 2026-09-27 | TSG RAN #113 |
| Rel-18 | V18.11.0 | 2026-09-27 | TSG RAN #113 |
| Rel-17 | V17.18.0 | 2026-09-27 | TSG RAN #113 |
| Rel-16 | V16.22.0 | 2026-06-30 | TSG RAN #112 |
| Rel-15 | V15.30.0 | 2025-10-10 | TSG RAN #109 |
Source: 3GPP specification archive, versions indexed by 3GPP Scout. Each version links its official file.
Change requests in V19.4.0
V19.4.0 of TS 38.331 includes 23 CRs. The first 12 by CR number are listed.
| CR | Category | Subject | Source | Working group meeting | TSG TDoc |
|---|---|---|---|---|---|
| CR 5804 rev 1 | F | Early implementation of R19 (e)RedCap UE capability with FR1-NTN | CATT, vivo, Ericsson | RAN2 #135 | RP-262144 |
| CR 5805 | F | Correction on the component of sbfd-Aware capability | Huawei, HiSilicon | RAN2 #135 | RP-262143 |
| CR 5813 rev 1 | A | Correction on perRAInfoList in RA-InformationCommon | CATT | RAN2 #135 | RP-262142 |
| CR 5814 | F | Correction on L1 measurement logging in SHR | CATT, Ericsson | RAN2 #135 | RP-262143 |
| CR 5815 rev 1 | F | Correction on SRB6 for Rel-19 AI PHY | CATT | RAN2 #135 | RP-262143 |
| CR 5817 rev 1 | A | Corrections on positioning SRS frequency hopping | ZTE Corporation, China Telecom | RAN2 #135 | RP-262142 |
| CR 5820 rev 1 | F | Miscellaneous Corrections for Multihop SL Relay | Apple | RAN2 #135 | RP-262144 |
| CR 5824 | F | Correction to OD-SSB field description | vivo | RAN2 #135 | RP-262143 |
| CR 5825 rev 3 | F | Correction on the presence of lowMobilityEvaluationLPWUS parameters | not listed | RP-262259 | |
| CR 5826 rev 1 | F | Corrections on CLTM and subsequent CPAC | ZTE Corporation, Sanechips, vivo | RAN2 #135 | RP-262144 |
| CR 5827 rev 2 | F | Correction on RRCReconfigurationComplete message delivery for inter-CU LTM | NEC, Ericsson, Huawei, HiSilicon, Nokia | RAN2 #135 | RP-262144 |
| CR 5832 | A | Correction on FR2 UL gap for SCG | Apple, Huawei, HiSilicon, Ericsson | RAN2 #135 | RP-262141 |
Source: 3GPP CR database.
Meetings behind the latest versions
Working group meetings that agreed the CRs in V19.4.0, V18.11.0, V17.18.0:
- RAN2 #135: 36 CRs
Plenary meetings:
- TSG RAN #113 approved V19.4.0 (Rel-19)
- TSG RAN #112 approved V19.3.0 (Rel-19)
- TSG RAN #110 approved V19.1.0 (Rel-19)
Source: 3GPP CR database and specification archive, as indexed by 3GPP Scout.
Clauses changed in V19.4.0
33 clauses changed or added in V19.4.0. The 10 with the largest edits are listed. Each clause number opens Scout on that clause.
| Clause | Title | Change | CRs |
|---|---|---|---|
| 6.3.1 | SIB2 | changed | CR 5840 |
| C | Annex C (normative): List of CRs Containing Early Implementable Features and Corrections | changed | CR 5804 |
| 5.3.5.15.3 | L2 U2N or U2U Remote UE Addition/Modification | changed | CR 5820 |
| 5.3.5.18.6 | LTM cell switch execution | changed | CR 5827 |
| 5.7.10.6 | Actions for the successful handover report determination | changed | CR 5814 |
| 6.3.2 | MeasObjectNR | changed | CR 5815, CR 5817, CR 5824, CR 5847, CR 5853, CR 5856, CR 5861, CR 5868, CR 5870 |
| 6.3.2 | PDSCH-Config | changed | CR 5815, CR 5817, CR 5824, CR 5847, CR 5853, CR 5856, CR 5861, CR 5868, CR 5870 |
| 6.3.2 | PUSCH-Config | changed | CR 5815, CR 5817, CR 5824, CR 5847, CR 5853, CR 5856, CR 5861, CR 5868, CR 5870 |
| 6.3.2 | SRS-Config | changed | CR 5815, CR 5817, CR 5824, CR 5847, CR 5853, CR 5856, CR 5861, CR 5868, CR 5870 |
| 6.3.3 | RF-Parameters | changed | CR 5805, CR 5861, CR 5873 |
Source: 3GPP Scout comparison of this version with the one before it.
Sources
- 3GPP TS 38.331 V19.4.0, clause 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
- 3GPP CR database.
How this page was made
The facts box and the tables come straight from the 3GPP specification archive and CR database 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.