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INTRODUCTION TO LTE

AND ITS UNIQUETECHNOLOGIES.

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The 3GPP LTE is acronym for long term evolution of UMTS.

In order to ensure the competitiveness of UMTS for the next 10years and beyond, concepts for UMTS Long Term Evolution(LTE) have been introduced in 3GPP release 8.

LTE is also referred to as EUTRA (Evolved UMTS TerrestrialRadio Access) or E-UTRAN (Evolved UMTS Terrestrial RadioAccess Network)

The architecture that will result from this work is called EPS(Evolved Packet System) and comprehends E-UTRAN(Evolved UTRAN) on the access side and EPC (EvolvedPacket Core) on the core side.

Can be considered the real 3.9G & invited to join the 4Gfamily.

Also considered a competitive system to mobile WiMAX as wewill show

WHAT IS LTE??

http://en.wikipedia.org/wiki/UTRANhttp://en.wikipedia.org/wiki/Evolved_Packet_Corehttp://en.wikipedia.org/wiki/Evolved_Packet_Corehttp://en.wikipedia.org/wiki/Evolved_Packet_Corehttp://en.wikipedia.org/wiki/Evolved_Packet_Corehttp://en.wikipedia.org/wiki/UTRAN

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Scalable BW: 1.25, 2.5, 5.0, 10.0 and 20.0 MHz.

Peak data rate:

Downlink (2 Ch MIMO) peak rate of 100 Mbps in 20 MHzchannel

Uplink (single Ch Tx) peak rate of 50 Mbps in 20 MHz channel Supported antenna configurations:

Downlink: 4x4,4x2, 2x2, 1x2, 1x1

Uplink: 1x2, 1x1

Duplexing modes: FDD and TDD

Number of active mobile terminals: LTE should suppor t at least 200 mobile terminals in the active

state when operating in 5 MHz.

In wider allocations than 5 MHz, a t least 400 terminals shouldbe supported

LTE DESIGN TARGETS

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Spectrum efficiency

Downlink: 3 to 4 x HSDPA Rel. 65bits/s/Hz

Uplink: 2 to 3 x HSUPA Rel. 62.5bits/s/hz

Latency

C-plane:

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ONE OF THE KEY TECHNOLOGIES USED IN LTE SYSTEMS.

OFDMA IS A MULTIPLE ACCESS METHOD BASED ON OFDM

SIGNALING THAT ALLOWS SIMULTANEOUS TRANSMISSIONS TO

AND FROM SEVERAL USERS ALONG WITH THE OTHER

ADVANTAGES OF OFDM.

OFDMA USED IN LTE FOR DL

INTRODUCTION TO LTE KEY TECHNOLOGIES

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LTE uplink requirements dif fer from downlink requirements.

power consumption is a key consideration for UE terminals.

The high PAPR and related loss of ef ficiency associated with

OFDM signaling are major concerns.

As a result, an alternative to OFDM was

sought for use in the LTE

uplink.

INTRODUCTION TO LTE KEY TECHNOLOGIES

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