Description
Enhanced Universal Terrestrial Radio Access (E-UTRA) is the standardized radio access technology for the Long-Term Evolution (LTE) system, commonly known as 4G. It defines the complete air interface protocol stack and physical layer specifications between the User Equipment (UE) and the Evolved Node B (eNB). The architecture is simplified and flat compared to 3G UMTS, featuring a two-node design with the eNB handling all radio-related functions, including radio resource management, admission control, scheduling, and header compression. This design minimizes latency and improves efficiency. E-UTRA supports flexible bandwidths from 1.4 MHz to 20 MHz and utilizes advanced radio techniques like Orthogonal Frequency Division Multiple Access (OFDMA) for downlink and Single Carrier Frequency Division Multiple Access (SC-FDMA) for uplink. These techniques provide robustness against multipath fading and improve power amplifier efficiency in mobile devices. The technology also incorporates Multiple-Input Multiple-Output (MIMO) antenna systems, carrier aggregation, and advanced modulation schemes (up to 256-QAM) to achieve peak data rates exceeding 1 Gbps in later releases. Its role is central to delivering the high-speed, low-latency connectivity that defines the 4G experience, enabling services like HD video streaming, online gaming, and real-time communications. The specifications govern everything from physical channel structures and modulation to radio link control, packet data convergence, and radio resource control protocols.
Purpose & Motivation
E-UTRA was created to address the growing demand for mobile broadband data and the limitations of 3G UMTS/HSPA networks. Previous 3GPP technologies, while successful for voice and initial data, struggled with inefficient spectrum usage, higher latency, and architectural complexity that hindered scalability for high-speed data services. The primary motivation was to develop a radio access network that could significantly reduce cost-per-bit, provide vastly improved user experience with lower latency, and support seamless mobility for a fully IP-based network. It was designed from the ground up to support packet-switched traffic efficiently, moving away from the circuit-switched legacy of 2G/3G. This allowed operators to meet the explosive growth in data traffic driven by smartphones and internet applications. E-UTRA's flat architecture simplified network deployment and reduced signaling overhead, enabling more efficient handovers and better support for quality of service (QoS) differentiation for various applications.
Classification
Detected Changes Across Releases
from 3GPP Change RequestsSpecific changes extracted from the „Change history“ tables of 3GPP specifications (170 CRs across 5 releases). Complements the general historical overview above with the evidence-based evolution of this function.
Studied in Rel-8, normative work from Rel-15.
In Release 15, E-UTRA was fundamentally enhanced to operate with the 5G Core Network (5GC), enabling LTE as a non-standalone access technology for 5G. This introduction required new procedures, such as specific handover and redirection mechanisms for E-UTRA connected to 5GC, and support for inter-RAT coordination like EN-DC. Additionally, updates included new UE capability handling via the TAU procedure and the introduction of Even Further Enhanced MTC for LTE.
- Addition of TAU trigger for change of NG-RAN radio capability TS 24.301CR3094
- Addition of NR bands to E-UTRA co-location blocking requirements TS 36.104CR4801
- E-UTRA - NR Cell Resource Coordination TS 36.300CR1122
- Introduction of New Radio Access Technology in TS 36.300 TS 36.300CR0998
- Introduction of E-UTRA connected to 5GCN TS 36.300CR1151
- EARFCN provisioning for UE in enhanced coverage TS 36.304CR0411
+ 40 more changes
In Release 16, E-UTRA introduced a UE Radio Capability ID mechanism to optimize signaling, involving network assignment, indication during Tracking Area Update (TAU), and procedures for deletion and reallocation. It also added support for an enhanced high-speed train (HST) scenario with new performance requirements for PUSCH and PRACH, and introduced features for LTE-based 5G terrestrial broadcast. Furthermore, new Quality of Service Class Identifiers (QCIs) were defined for an Enhanced Framework for Uplink Streaming.
- New QCIs for Enhanced Framework for Uplink Streaming TS 24.301CR3155
- Signalling of UE support for RACS and of UE radio capability ID TS 24.301CR3242
- UE radio capability ID assignment by the network TS 24.301CR3243
- UE radio capability ID availability indication at mobility TAU TS 24.301CR3283
- UE radio capability ID assignment via GUTI reallocation procedure TS 24.301CR3328
- UE radio capability ID deletion upon Version ID change TS 24.301CR3329
+ 44 more changes
In Release 17, E-UTRA enhancements included the introduction of new bands and bandwidth allocations for LTE-based 5G terrestrial broadcast, along with corresponding UE capabilities. The release also added support for Non-Terrestrial Networks in NB-IoT and eMTC, and provided clarifications and corrections for E-UTRA capability handling and procedures like cell selection during emergency service fallback.
- Clarification of E-UTRA capability handling TS 24.301CR3545
- Provisioning PC5 DRX configuration at the UE for broadcast/groupcast when the UE is not served by E-UTRA and not served by NR TS 24.587CR0206
- Introduction of new bands and bandwidth allocation for LTE-based 5G terrestrial broadcast TS 36.300CR1360
- UE capabilities for new bands and bandwidth allocation for LTE-based 5G terrestrial broadcast TS 36.306CR1836
- Support of Non-Terrestrial Network in NB-IoT and eMTC TS 36.306CR1846
- Introducing Non-Terrestrial Network in NB-IoT and eMTC TS 36.321CR1537
+ 25 more changes
In Release 18, E-UTRA introduced enhanced support for Uncrewed Aerial Vehicles (UAV) and a new capability for an enhanced channel raster. It also added features for enhanced discontinuous coverage, including UE unavailability period reporting and capability negotiation, to improve mobility management and power efficiency.
- Capability negotiation for enhanced discontinuous coverage - EPS TS 24.301CR3920
- UE unavailability period reporting for enhanced discontinuous coverage overrides mobility management congestion control - EPS TS 24.301CR3939
- Support for enhanced discontinuous coverage TS 24.301CR3937
- Introduction of Enhanced LTE Support for Uncrewed Aerial Vehicles TS 36.300CR1389
- Introduction of Enhanced LTE Support for UAV TS 36.306CR1871
- Introduction of Enhanced LTE Support for UAV (Uncrewed Aerial Vehicles) TS 36.331CR4967
+ 20 more changes
In Release 19, the key E-UTRA updates included the introduction of new bands for LTE-based 5G terrestrial broadcast for early deployments and enhanced procedures for satellite E-UTRA cells, specifically aligning attach and service request procedures with the term "S&F satellite E-UTRA cell." Additionally, the release introduced updates for UE capability handling, preventing E-UTRA capability disabling during detaching for eCall inactivity and providing an update on re-enabling a UE's E-UTRA capability.
- CR to TS 36.104 : New bands for LTE based 5G terrestrial broadcast for early deployments, Rel-19 TS 36.104CR5006
- Enhanced AEF Capabilities Description TS 23.222CR0267
- Enhanced the CCF's functional description for service API information TS 23.222CR0269
- Enhanced API invoker obtaining authorization for service API access in CAPIF interconnection TS 23.222CR0303
- Enhanced obtaining security information in CAPIF interconnection TS 23.222CR0304
- Enhanced Open Service API discover Procedure TS 23.222CR0305
+ 11 more changes
Explore further
Broader topics and technologies where E-UTRA plays a role.
Defining Specifications
3GPP specifications that define or reference E-UTRA, with the latest known release. Sourced from the 3GPP document catalog — see methodology.
| Specification | Title | Release |
|---|---|---|
| TR 21.905 vj00 | 3GPP Technical Terms and Definitions | Rel-19 |
| TS 23.222 vj80 | Common API Framework for 3GPP Northbound APIs | Rel-19 |
| TS 24.167 vj00 | 3GPP IMS Management Object Specification | Rel-19 |
| TS 24.301 vj60 | NAS protocol for Evolved Packet System | Rel-19 |
| TS 24.312 vj00 | ANDSF Management Objects Specification | Rel-19 |
| TS 24.587 vj30 | V2X Services Protocols for 5G System | Rel-19 |
| TS 24.801 v810 | CT1 SAE NAS Aspects for EPC | Rel-8 |
| TS 24.890 vg00 | 5G NAS Protocol for 5GS Stage 3 | Rel-16 |
| TS 25.133 vj00 | UTRAN RRM Requirements for FDD | Rel-19 |
| TS 25.215 vj00 | UTRA FDD Measurement Definitions | Rel-19 |
| TS 25.225 vj00 | UTRA TDD Physical Layer Measurements | Rel-19 |
| TS 25.304 vj00 | UTRA Idle Mode Procedures Specification | Rel-19 |
| TS 25.331 vj00 | UTRAN RRC Protocol Specification | Rel-19 |
| TS 25.367 vj00 | Home NodeB Mobility Procedures | Rel-19 |
| TS 25.413 vj00 | Radio Access Network Application Part (RANAP) | Rel-19 |
| TS 25.423 vj00 | UTRAN RNSAP Specification | Rel-19 |
| TR 25.912 vj00 | Evolved UTRA and UTRAN Technical Report | Rel-19 |
| TS 25.913 v900 | Evolved UTRA and UTRAN Requirements | Rel-9 |
| TS 28.627 vj00 | SON Policy NRM IRP: Requirements | Rel-19 |
| TS 28.658 vj00 | E-UTRAN NRM IRP Information Service | Rel-19 |
| TS 29.514 vj40 | 5G System; Policy Authorization Service; Stage 3 | Rel-19 |
| TS 31.121 vi50 | UICC-terminal interface test specification | Rel-18 |
| TS 32.277 vj20 | Charging Management for Proximity Services (ProSe) | Rel-19 |
| TS 32.762 vb70 | E-UTRAN NRM IRP Information Service | Rel-11 |
| TS 36.101 vj30 | LTE UE Radio Transmission & Reception Requirements | Rel-19 |
| TS 36.102 vj10 | E-UTRA UE Satellite Access RF Requirements | Rel-19 |
| TS 36.104 vj10 | Base Station (BS) radio transmission and reception | Rel-19 |
| TS 36.108 vj10 | Satellite Access Node RF Requirements | Rel-19 |
| TS 36.113 vj00 | EMC Requirements for E-UTRA Base Stations | Rel-19 |
| TS 36.116 vj00 | E-UTRA Relay RF Requirements | Rel-19 |
| TS 36.117 vj00 | E-UTRA Relay RF Test Methods & Requirements | Rel-19 |
| TS 36.133 vj20 | E-UTRA RRM Requirements | Rel-19 |
| TS 36.141 vj00 | E-UTRA BS Conformance Testing | Rel-19 |
| TS 36.171 vj10 | A-GNSS Minimum Performance Requirements for UE | Rel-19 |
| TS 36.181 vj30 | E-UTRA RF Test Methods for Satellite Access Node | Rel-19 |
| TS 36.201 vj00 | LTE Physical Layer General Description | Rel-19 |
| TS 36.214 vj00 | E-UTRA Physical Layer Measurements | Rel-19 |
| TS 36.300 vj00 | E-UTRAN Radio Interface Protocol Architecture Overview | Rel-19 |
| TS 36.302 vj00 | E-UTRA Physical Layer Services | Rel-19 |
| TS 36.304 vj00 | UE Idle Mode Procedures in E-UTRA | Rel-19 |
| TS 36.306 vj00 | E-UTRA UE Radio Access Capability Parameters | Rel-19 |
| TS 36.321 vj00 | E-UTRA MAC Protocol Specification | Rel-19 |
| TS 36.322 vj00 | E-UTRA Radio Link Control Protocol Specification | Rel-19 |
| TS 36.323 vj00 | PDCP Protocol Specification | Rel-19 |
| TS 36.331 vj00 | LTE RRC Protocol Specification | Rel-19 |
| TS 36.360 vj00 | LTE-WLAN Aggregation Adaptation Protocol | Rel-19 |
| TS 36.361 vj00 | LWIP Encapsulation Protocol Specification | Rel-19 |
| TS 36.401 vj00 | E-UTRAN Overall Architecture Description | Rel-19 |
| TS 36.414 vj00 | S1 Interface User Plane Transport | Rel-19 |
| TS 36.424 vj00 | X2 Interface User Plane Transport Protocols | Rel-19 |
| TS 36.445 vj00 | M1 interface user plane protocol for MBMS | Rel-19 |
| TS 36.521 vj00 | E-UTRA UE Conformance ICS Proforma | Rel-19 |
| TS 36.714 | 3GPP TR 36.714 | Rel-8 |
| TS 36.715 | 3GPP TR 36.715 | Rel-8 |
| TS 36.716 | 3GPP TR 36.716 | Rel-8 |
| TS 36.744 ve00 | CBRS 3.5GHz Band Specification for US | Rel-14 |
| TS 36.750 ve10 | Study on enhancement of VoLTE | Rel-14 |
| TS 36.755 vf00 | US 600 MHz LTE Band 71 Technical Report | Rel-15 |
| TS 36.761 vf00 | Extended-Band 12 Study Report | Rel-15 |
| TS 36.790 vf00 | LAA/eLAA for CBRS 3.5GHz Band in US | Rel-15 |
| TR 36.791 vg00 | E-UTRA 2.4 GHz TDD Band for US | Rel-16 |
| TS 36.829 vb10 | Feasibility Study on LTE UE Interference Cancellation | Rel-11 |
| TS 36.852 | 3GPP TR 36.852 | Rel-8 |
| TS 36.853 | 3GPP TR 36.853 | Rel-8 |
| TS 36.855 vd00 | E-UTRA Positioning Enhancements Study | Rel-13 |
| TS 36.860 | 3GPP TR 36.860 | Rel-8 |
| TS 36.867 vd00 | LTE DL 4 Rx Antenna Port Study TR | Rel-13 |
| TS 36.894 vd00 | Study on LTE Measurement Gap Enhancement | Rel-13 |
| TS 36.899 | 3GPP TR 36.899 | Rel-8 |
| TS 36.938 v900 | E-UTRAN to 3GPP2/Mobile WiMAX Mobility | Rel-9 |
| TS 37.106 vj00 | UE RF Requirements for Shared Spectrum Access | Rel-19 |
| TS 37.107 vj00 | RF Requirements for LAA and NR-U Base Stations | Rel-19 |
| TS 37.113 vj00 | EMC Requirements for Multi-Standard Radio Base Stations | Rel-19 |
| TS 37.141 vj10 | RF Test Methods for Multi-Standard Radio Base Stations | Rel-19 |
| TS 37.171 vj00 | UE Positioning Performance Requirements | Rel-19 |
| TS 37.320 vj00 | Minimization of Drive Tests (MDT) Overview | Rel-19 |
| TS 37.355 vj20 | LTE Positioning Protocol (LPP) | Rel-19 |
| TS 37.544 vg70 | UE Radiated Performance Test Procedures | Rel-16 |
| TS 37.571 vj00 | UE Conformance for Positioning | Rel-19 |
| TS 37.716 | 3GPP TR 37.716 | Rel-8 |
| TS 37.717 | 3GPP TR 37.717 | Rel-8 |
| TS 37.718 | 3GPP TR 37.718 | Rel-8 |
| TS 37.719 vj00 | 3GPP TR 37.719: Dual Connectivity Band Combinations | Rel-19 |
| TS 37.863 | 3GPP TR 37.863 | Rel-8 |
| TS 37.872 vf10 | Technical Report on SUL & LTE-NR DC with SUL | Rel-15 |
| TR 37.901 vf10 | UE Application Layer Data Throughput Performance | Rel-15 |
| TR 37.902 vj00 | OTA TRP/TRS Measurement for LTE Terminals | Rel-19 |
| TS 38.104 vj20 | NR Base Station RF Requirements | Rel-19 |
| TS 38.133 vj20 | 5G UE Radio Requirements for RRC_IDLE Mobility | Rel-19 |
| TS 38.141 vj20 | NR Base Station RF Conformance Testing Part 1 | Rel-19 |
| TS 38.161 vj10 | NR UE TRP and TRS Requirements for FR1 | Rel-19 |
| TS 38.171 vj10 | 5G A-GNSS UE Positioning Requirements | Rel-19 |
| TS 38.174 vj10 | NR Integrated Access and Backhaul Radio Spec | Rel-19 |
| TS 38.176 vj20 | IAB Conformance Testing Specification | Rel-19 |
| TS 38.191 vj00 | NR Ambient IoT RF Characteristics | Rel-19 |
| TS 38.201 vj00 | NR Physical Layer General Description | Rel-19 |
| TS 38.304 vj00 | UE RRC_IDLE and RRC_INACTIVE Procedures | Rel-19 |
| TS 38.331 vj00 | NR Radio Resource Control (RRC) Protocol Specification | Rel-19 |
| TS 38.521 vj20 | NR Physical Layer UE Conformance Testing | Rel-19 |
| TS 38.522 vj11 | UE Conformance Test Applicability Statement | Rel-19 |
| TS 38.561 vj00 | UE Conformance for TRP/TRS FR1 | Rel-19 |
| TS 38.717 | 3GPP TR 38.717 | Rel-8 |
| TS 38.718 | 3GPP TR 38.718 | Rel-8 |
| TS 38.719 vj00 | Rel-19 NR SUL Configurations and CA Band Combinations | Rel-19 |
| TR 38.846 vi10 | Technical Report | Rel-18 |
| TS 38.870 vj20 | Enhanced OTA Test Methods for NR FR1 TRP/TRS | Rel-19 |
| TS 38.873 vg00 | NR Band n48 Technical Report | Rel-16 |
| TR 38.889 vg00 | NR-based access to unlicensed spectrum study | Rel-16 |
| TR 38.892 vi00 | Technical Report | Rel-18 |
| TS 43.129 vj00 | PS Handover in GERAN A/Gb and GAN Modes | Rel-19 |
| TS 48.018 vj00 | BSS-SGSN Interface for GPRS Control | Rel-19 |