Long Term Evolution

Introduction

The 3GPP™ radio interface, UTRA (Universal Terrestrial Radio Access), with the enhancements provided by High Speed Packet Access (HSPA), for both downlink and uplink, will remain highly competitive for several years. Nevertheless, the industry that has developed the 3GPP™ technologies is anxious to ensure the continued competitiveness of those technologies and has launched a Long Term Evolution project within 3GPP.

The focus of the LTE project is on:

  • enhancement of the Universal Terrestrial Radio Access (UTRA)
  • optimization of the UTRAN architecture.

A parallel activity is taking place on the evolution of the 3GPP™ System Architecture (SAE).

A more complete summary of the LTE and SAE programmes can be found on the 3GPP™ website.

Our Role & Activities

Long Term Evolution (LTE) of the 3GPP radio technology

The basic criteria for the work on LTE were:

  • Demand for higher data rates
  • Expectations of additional 3G spectrum allocations
  • Greater flexibility in frequency allocations
  • Continued cost reduction
  • Keeping up with other technologies.

More specifically:

  • Significantly increased peak data rates
  • Increased bitrates at the edge of cells
  • Improved spectrum efficiency
  • Improved latency
  • Scaleable bandwidth
  • Reduced capital and operational expenditure
  • Acceptable system and terminal complexity, cost and power consumption
  • Compatibility with earlier releases and with other systems
  • Optimized for low mobile speed but supporting high mobile speed (up to 500 km/h).

ETSI TR 125 913 collects together all the agreed requirements for the Evolved UTRA & UTRAN.

In response to these requirements, various radio technologies were considered but the conclusion was that the downlink would use Orthogonal Frequency Division Multiplexing (OFDM) and the uplink would use Single Carrier - Frequency Division Multiple Access (SC-FDMA). Supported downlink data-modulation schemes are QPSK, 16QAM, and 64QAM, whilst the possible uplink data-modulation schemes are BPSK, QPSK, 8PSK and 16QAM.

3GPP™ Technical Report TR 25.814 defines the physical layer aspects of Evolved UTRA.

System Architecture Evolution (SAE)

The objectives of the complementary SAE study were:

  • 'to develop a framework for an evolution or migration of the 3GPP™ system to a higher-data-rate, lower-latency, packet-optimized system that supports multiple Radio Access Technologies.
  • The focus of this work is on the PS domain with the assumption that voice services are supported in this domain'.

The particular focus has been on:

  • enhancement of Packet Switched technology to cope with rapid growth in IP traffic, i.e.

    • higher data rates
    • lower latency
    • packet-optimized system
  • through
    • fully IP network
    • simplified network architecture
    • distributed control.

The possible use of various access technologies (wireless and wired) has been assumed - not just Enhanced UTRA.

The report of the SAE study can be found in 3GPP™ Technical Report TR 23.882.

Standards

The following is a list of the 20 latest published ETSI standards on long term evolution.

A full list of related standards in the public domain is accessible via the ETSI standards search. Via this interface you can also subscribe for alerts on updates of ETSI standards.

For work in progress see the ETSI Work Programme on the Portal.

Standard No. Standard title.
TR 122 903 Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; Study on Videotelephony teleservice (3GPP TR 22.903 version 14.0.0 Release 14)
TR 122 906 Universal Mobile Telecommunications System (UMTS); LTE; Study on IMS based peer-to-peer content distribution services (3GPP TR 22.906 version 14.0.0 Release 14)
TR 122 908 Universal Mobile Telecommunications System (UMTS); LTE; Study on Paging Permission with Access Control (PPAC) (3GPP TR 22.908 version 14.0.0 Release 14)
TR 122 912 Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; Study into network selection requirements for non-3GPP access (3GPP TR 22.912 version 14.0.0 Release 14)
TR 122 936 Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; Multi-system terminals (3GPP TR 22.936 version 14.0.0 Release 14)
TR 122 940 Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; IP Multimedia Subsystem (IMS) messaging (3GPP TR 22.940 version 14.0.0 Release 14)
TR 122 942 Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; Study on Value Added Services (VAS) for Short Message Service (SMS) (3GPP TR 22.942 version 14.0.0 Release 14)
TR 122 944 Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; Report on service requirements for UE functionality split (3GPP TR 22.944 version 14.0.0 Release 14)
TR 122 948 Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; Study of requirements of IP-Multimedia Subsystem (IMS) convergent multimedia conferencing (3GPP TR 22.948 version 14.0.0 Release 14)
TR 122 949 Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; Study on a generalized privacy capability (3GPP TR 22.949 version 14.0.0 Release 14)
TR 122 950 Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; Priority service feasibility study (3GPP TR 22.950 version 14.0.0 Release 14)
TR 122 951 Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; Service aspects and requirements for network sharing (3GPP TR 22.951 version 14.0.0 Release 14)
TR 122 952 Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; Priority service guide (3GPP TR 22.952 version 14.0.0 Release 14)
TR 122 953 Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; Multimedia priority service feasibility study (3GPP TR 22.953 version 14.0.0 Release 14)
TR 122 967 Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; Transferring of emergency call data (3GPP TR 22.967 version 14.0.0 Release 14)
TR 122 968 Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; Study for requirements for a Public Warning System (PWS) service (3GPP TR 22.968 version 14.0.0 Release 14)
TR 122 973 Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; IMS Multimedia Telephony service; and supplementary services (3GPP TR 22.973 version 14.0.0 Release 14)
TR 122 977 Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; Feasibility study for speech-enabled services (3GPP TR 22.977 version 14.0.0 Release 14)
TR 122 978 Universal Mobile Telecommunications System (UMTS); LTE; All-IP network (AIPN) feasibility study (3GPP TR 22.978 version 14.0.0 Release 14)
TR 122 979 Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; Feasibility study on combined Circuit Switched (CS) calls and IP Multimedia Subsystem (IMS) sessions (3GPP TR 22.979 version 14.0.0 Release 14)