LONG TERM EVOLUTION DANISH HASRAT (091042) DEEPAK SINGH (091043) GAURAV THAWANI (091052) NILESH SINGH (091079)

TOPICS Introduction 3GPP Evolution Motivation LTE performance requirements Key Features of LTE LTE Network Architecture OFDM SC-FDMA Conclusions LTE vs WiMAX

INTRODUCTION 3GPP Long Term Evolution, referred to as LTE. 3GPP refers to 3 rd Generation Partnership Project 3GPP work on the Evolution of the 3G Mobile System started in November 2004 The world's first publicly available LTE service was launched by TeliaSonera in Norway on 14 December 2009

INTRODUCTION CONT….. Marketed as 4G LTE, is a standard for wireless communication of high-speed data for mobile phones and data terminals. It is based on the GSM/EDGE and UMTS/HSPA network technologies, increasing the capacity and speed using new modulation techniques.

3 GPP The 3rd Generation Partnership Project (3GPP) is a collaboration between groups of telecommunications associations, known as the Organizational Partners. The initial scope of 3GPP was to make a globally applicable third-generation (3G) mobile phone system specification based on evolved GSM specifications.

MOTIVATION Need for higher data rates and greater spectral efficiency. Need for Packet Switched optimized system. Need for cheaper infrastructure

LTE PERFORMANCE Data Rate:  Instantaneous downlink peak data rate of 100Mbit/s in a20MHz downlink spectrum (i.e. 5 bit/s/Hz)  Instantaneous uplink peak data rate of 50Mbit/s in a 20MHz uplink spectrum (i.e. 2.5 bit/s/Hz) Cell range  5 km - optimal size  30km sizes with reasonable performance up to 100 km cell sizes supported with acceptable performance

PERFORMANCE CONT….. Cell capacity  up to 200 active users per cell(5 MHz) (i.e., 200 active data clients) Mobility  Optimized for low mobility(0-15km/h) but supports high speed Improved broadcasting

KEY FEATURES Multiple access scheme  Downlink: OFDMA  Uplink: Single Carrier FDMA (SC-FDMA) Adaptive modulation and coding  DL modulations: QPSK, 16QAM, and 64QAM  UL modulations: QPSK and 16QAM Support for both FDD and TDD

LTE NETWORK ARCHITECTURE

ARCHITECTURE CONT…... Evolved Node B(Enb)  Supports air interface  Provides radio resource management functions Serving Gateway(SGW)  Provides Mobility  Responsibility for Routing and Forwarding

ARCHITECTURE CONT…... Packet Data Network Gateway(PDN GW)  Provides connectivity to Internet  Provides QoS abd mobility between 3G and non -3G networks Mobility Management Entity (MME)  Manages mobility and provides security  Operates in control plane and provides authentication

SYSTEM ARCHITECTURE EVOLUTION(SAE) System Architecture Evolution (SAE) is the core network architecture of 3GPP's future LTE wireless communication standard. SAE is the evolution of the GPRS Core Network, with some differences

SAE CONT…. The main principles and objectives of the LTE-SAE architecture include :  IP-based protocols on all interfaces;  Simplified network architecture  All IP network  All services are via Packet Switched domain  Support mobility between heterogeneous RATs, including legacy systems as GPRS, but also non-3GPP systems (say WiMAX)  Support for multiple, heterogeneous RATs, including legacy systems as GPRS, but also non-3GPP systems (say WiMAX)

OFDM Orthogonal frequency-division multiplexing LTE uses OFDM for the downlink – that is, from the base station to the terminal. OFDM meets the LTE requirement for spectrum flexibility and enables cost-efficient solutions for very wide carriers with high peak rates. OFDM uses a large number of narrow sub-carriers for multi-carrier transmission.

OFDM CONT…. OFDM is a broadband multicarrier modulation method that offers superior performance and benefits over older, more traditional single-carrier modulation methods because it is a better fit with today’s high-speed data requirements and operation in the UHF and microwave spectrum.

OFDM CONT….

SC-FDMA The LTE uplink transmission scheme for FDD and TDD mode is based on SC-FDMA (Single Carrier Frequency Division Multiple Access). This is to compensate for a drawback with normal OFDM, which has a very high Peak to Average Power Ratio (PAPR). High PAPR requires expensive and inefficient power amplifiers with high requirements on linearity, which increases the cost of the terminal

SC-FDMA CONT….

LTE vs WiMAX First, both are 4G technologies designed to move data rather than voice and both are IP networks based on OFDM technology. WiMax is based on a IEEE standard (802.16). Depending on the spectrum alloted for WiMax deployments and how the network is configured, this can mean a WiMax network is cheaper to build. As for speeds, LTE will be faster than the current generation of WiMax.

LTE vs WiMAX CONT…. The crucial difference is that, unlike WiMAX, which requires a new network to be built, LTE runs on an evolution of the existing UMTS infrastructure already used by over 80 per cent of mobile subscribers globally.

CONCLUSION LTE is a highly optimized, spectrally efficient and it allows operators to offer advanced services and higher performance for new and wider bandwidths. LTE is based on a flattened IP-based network architecture that improves network latency.

REFERENCES /white_paper/3GPPEVOLUTIONWP.pdf presentationppt asia.motorola.com/products/images/sharedDownloa ds/White_Paper/Long_Term_Evolution_(LTE)_Wirele ss.pdf

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