LTE System Architecture

SYSTEM & ARCHITECTURE

LTE

•             Standardization effort started in late 2004

–     With HSPA (downlink and uplink), UTRA will remain highly competitive for several years

–     IEEE is standardizing mobile WiMAX => Threat for loosing competitive edge

•             LTE focus:

–     Enhancement of the UTRA

–     Optimisation of the UTRAN architecture

–     To ensure the continued competitiveness of the 3GPP technologies for the future

•             LTE was the first and only technology recognized by the Next Generation Mobile Network alliance to meet its broad requirements

•             Target deployment in 2010.

Service Capabilities

•                                               •                   Reduced cost per bit

–       Improve spectrum efficiency ( e.g. 2-4 x Rel6)

–       Reduce cost of backhaul (transmission in UTRAN)

•                Increased service provisioning – more services at lower cost with better user experience

•                

•                Reduced latency, to 10 msec round-trip time between user equipment and the base station, and to less than 100 msec transition time from inactive to active

•                Increase the support of QoS for the various types of services (e.g. VoIP)

•                Increase “cell edge bit rate” whilst maintaining same site locations as deployed today

•                                             •                Reasonable terminal power consumption

                    •         Flexibility of use of existing and new frequency bands.

System Capabilities

•               Downlink peak data rates up to 326 Mbps with 20 MHz bandwidth

•                Uplink peak data rates up to 86.4 Mbps with 20 MHz bandwidth

•                                              •               Operation in both TDD and FDD modes.

•                Variable duplex technology within bands as well as between bands

•                Scalable bandwidth up to 20 MHz, covering 1.4, 2.5, 5, 10, 15, and 20 MHz

•                Increased spectral efficiency over Release 6 HSPA by a factor of two to four

•                                              •             Enhance the bit rate for MBMS (e.g. 1-3 Mbps).

Architecture & Mobility Capabilities\

  •                UTRAN Evolution and UTRA Evolution with            simplified architecture

•                                                •                Open interfaces to support Multi-vendor deployments

•                                               •              Robustness – no single point of failure

•                Support of multi-RAT with resources controlled from the network

•                Support of  seamless mobility to legacy systems as well as to other emerging systems including

–       Inter-RAT Handovers

–       Service based RAT Selection

                    •           Maintain appropriate level of security.