LTE-Advanced

introduction

LTE-the evolution of LTE is on formal name for Further Advancements for E-UTRA, began in March 2008, may, 2008 sure demand. It meet the ITU-R IMT-on the demand for technology, not only is the 3 GPP form Europe IMT-on technology proposal an important source of, or a backward compatibility technology, is fully compatible with LTE is evolution, not revolution.

Technology parameters

Bandwidth: 100 MHz

Peak rate: 1 Gbps downward, ascending 500 Mbps

Peak spectrum efficiency: downside 30 BPS/Hz ac, ascending 15 BPS/Hz ac

According to indoor environment is optimized

Effective support new frequency and big bandwidth applications

Peak rate increase in the spectrum efficiency improvement limited

Major new technology

1 many frequency spectrum synergies with integration

Oslash; and Many frequency band wireless access system: cascade high frequency band of optimization

All for small range hot spot, indoor and family Home base station (an), based on the scene B of low frequency band system for high frequency band the system to provide the "of bottom line", to fill in the high frequencies of the system and high-speed mobile users cover empty

Oslash; and Spectrum integration (such) : will the Aggregation adjacent several smaller bands for a larger integrated band

2 Relay (Relay) technology: Relay now (RS)

Oslash; and To improve coverage and improve the capacity Reapter (straight) & Oslash; let stand Layer 1 RS (AF amplify- -cupb.it) enhancing straight put stand & Oslash; Layer 2 RS and layer 3 RS (DF decoded- -cupb.it), of which the layer 2 dispute is bigger

Oslash; and RS, new interference sources, need new frame structure and resources scheduling, duplex way, etc

3 collaborative more transmission

Oslash; and CoMP, Coordinative Point of Multiple

Oslash; and Similar to the distributed antenna

Oslash; and Enhance the service, especially residential edge

4 the challenge of family base station

Oslash; and Dense deployment, overlapping coverage can cause very complex interference

Oslash; and The family of the base, operators may change the ownership of the part of the net loss of control of the rules, nets optimal, the more exacerbated the interference and access control management difficulties

5 the physical layer transmission technology

Oslash; and Uplink OFDMA instead of SC-FDMA (DFT-S-OFDM)

Oslash; and Between zones interference suppression techniques: united detection and eliminate interference