TS 36.331 – E-UTRA Radio Resource Control (RRC) Protocol
3GPP TS 36.331 is the 3GPP Technical Specification for E-UTRA Radio Resource Control (RRC) Protocol. Its official 3GPP title is “Evolved Universal Terrestrial Radio Access (E-UTRA)”. It is published in 12 releases (Rel-8 to Rel-19); the latest version is 19.4.0 in Rel-19.
Defines the LTE RRC protocol between UE/RN and E-UTRAN, covering procedures, messages, ASN.1 syntax, and inter-node containers for handover, including NR interworking and IAB support.
Releases and versions of TS 36.331
| Release | Latest version | Links |
|---|---|---|
| Rel-19 | 19.4.0 | Read · Download (3GPP) |
| Rel-18 | 18.11.0 | Read · Download (3GPP) |
| Rel-17 | 17.16.0 | Read · Download (3GPP) |
| Rel-16 | 16.21.0 | Read · Download (3GPP) |
| Rel-15 | 15.24.0 | Read · Download (3GPP) |
| Rel-14 | 14.18.0 | Read · Download (3GPP) |
| Rel-13 | 13.17.0 | Read · Download (3GPP) |
| Rel-12 | 12.20.0 | Read · Download (3GPP) |
| Rel-11 | 11.19.0 | Read · Download (3GPP) |
| Rel-10 | 10.22.0 | Read · Download (3GPP) |
| Rel-9 | 9.18.0 | Read · Download (3GPP) |
| Rel-8 | 8.21.0 | Read · Download (3GPP) |
Scope of TS 36.331
Category: Radio Access (Radio Resource Control). Technology generation: 4G. Network layer: RAN.
Who should read this specification?
- Network operators
- Device manufacturers
- Researchers and academics
Implementation notes
Complexity level: Expert. Implementation difficulty: High.
Key technologies
Excerpt from TS 36.331
1 Scope
The present document specifies the Radio Resource Control protocol for the radio interface between UE and E-UTRAN as well as for the radio interface between RN and E-UTRAN.
The scope of the present document also includes:
- the radio related information transported in a transparent container between source eNB and target eNB upon inter eNB handover;
- the radio related information transported in a transparent container between a source or target eNB and another system upon inter RAT handover.
The RRC protocol is also used to configure the radio interface between an IAB-node and its parent nodes as specified in TS 38.300 [106].
Excerpt from the official 3GPP document (Rel-19). Read the full specification with interactive table of contents.
Specifications referenced by TS 36.331
- TS 23.502 5G System Procedures
- TS 38.314 NR Performance Measurements Specification
- TS 23.287 5G V2X Architecture Enhancements
- TS 38.472 F1 Interface Signalling Transport Specification
- TS 38.300 NR and NG-RAN Overall Description
- TS 38.174 NR Integrated Access and Backhaul Requirements
- TS 36.423 X2 Application Protocol (X2AP) Specification
- TS 37.355 LTE Positioning Protocol (LPP)
- TS 22.011 Service accessibility
- TS 23.304 5G Proximity Services (ProSe) Stage 2
- TS 36.102 E-UTRA UE Satellite Access Requirements
- TS 36.108 Satellite Access Node RF Requirements
Specifications that reference TS 36.331
- TS 23.501 5G System Architecture
- TS 23.502 5G System Procedures
- TS 33.501 5G Security Architecture
- TS 24.008 NAS Call, Mobility and Session Procedures
- TS 23.401 Evolved Packet System Architecture
- TS 38.300 NR and NG-RAN Overall Description
- TS 23.060 GPRS Stage 2 Service Description
- TS 36.300 E-UTRAN Radio Interface Protocol Architecture
- TS 38.331 NR Radio Resource Control (RRC)
- TS 26.114 IMS Multimedia Telephony Client
- TS 29.571 5G Common Data Types
- TS 25.331 RRC Protocol for UE-UTRAN Radio Interface
Other specifications in the 36 series
- TS 36.314 E-UTRA Radio Measurements Specification
- TS 36.321 E-UTRA MAC Protocol Specification
- TS 36.322 E-UTRA Radio Link Control Protocol Specification
- TS 36.323 PDCP Protocol Specification
- TS 36.355 LTE Positioning Protocol (LPP)
- TS 36.360 LTE-WLAN Aggregation Adaptation Protocol
- TS 36.361 LWIP Encapsulation Protocol Specification
- TS 36.401 E-UTRAN Overall Architecture Description
Frequently asked questions
What is 3GPP TS 36.331?
3GPP TS 36.331 is the 3GPP Technical Specification for E-UTRA Radio Resource Control (RRC) Protocol. Defines the LTE RRC protocol between UE/RN and E-UTRAN, covering procedures, messages, ASN.1 syntax, and inter-node containers for handover, including NR interworking and IAB support.
Which 3GPP releases include TS 36.331?
TS 36.331 is published in 12 releases, from Rel-8 to Rel-19. The latest version on 3GPP Explorer is 19.4.0 (Rel-19).
What category does TS 36.331 belong to?
TS 36.331 belongs to the Radio Access (Radio Resource Control) category of 3GPP specifications. It applies to 4G networks.
View the full specification with interactive table of contents, version history, and AI analysis.
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