LTELong Term Evolution – The next generation of telecommunication

Topics

• introduction• history• features• competitor -WiMAX• problems of LTE• what’s next

Introduction

• next generation of Telecommunication network following the UMTS/HSPA+ • the standard is developed by the 3GPP (3rd Generation Partnership

Project)

Not 4G

History

• first Proposed by NTT DoCoMo in 2004• first publicly launched by TeliaSorena in 2009

Features

• IP-based network• peak data transfer rate - downlink 300 Mbps and uplink 75 Mbps• transfer latency less than 5 ms• ability to manage fast-moving mobiles• supports multi-cast and broadcast streams• provide up to 20MHz of spectrum• seamless handover with older network technology (GSM, UMTS,

CDMA2000)

Inside

CompetitorWiMAX vs LTEwho is the winner?

WiMAX

• IEEE 802.16 standard• up to 141 Mbps downlink and 138 Mbps uplink data transfer rate• mostly use as PC cards or USB dongles• support Peer-to-Peer (ad hoc)

Comparison

WiMAX LTE

Downlink OFDMA

Uplink OFDMA SC-FDMA

Architecture All-IP

SpectrumFDD (802.16m)

FDD and TDDTDD

Spectrum flexibility Fixed bandwidth Flexible bandwidth

Services/Apps IMS (IP Multimedia Subsystem)

Standards IETF 3GPP

Problems of LTEAnd solutions

Voice calls

• LTE support only packet switching• Voice calls in GSM, UMTS and CDMA2000 are circuit switched

• How can we use regular voice call or SMS on LTE?• How can we refer to handset number on IP-based network?• How can we handle to continue voice call on 2G/3G when the LTE

network disappear?

Solution (in development)

• VoLTE – Voice over LTE• based on IMS (IP Multimedia Subsystem)• similar to VoIP

• CSFB – Circuit Switched Fallback• LTE provides only data services• fallback to circuit switched when do voice call

• SVLTE – Simultaneous Voice and LTE• handset works simultaneously on both LTE and CS• based on handset - no special requirements on the network

Handsets

• limited number of handset models are supported• every LTE handsets still very expensive

What’s next

LTE Advanced

• scalable system bandwidth up to 100 MHz• support relay node base stations• up to 3.3Gbps peak download rates (with aggregated 100 MHz

bandwidth)• Yota is the first carrier to provide commercial LTE Advanced• launched on October 2012• but no compatible handset available until 2013

Thank youNow it's time for Q&A

Reference

• Google

References

• http://gsmcommunications.blogspot.com/2011/04/lte-vs-wimax-4g-comparison.html• http://www.slideshare.net/hamdani2/lte-long-term-evolution• http://en.wikipedia.org/wiki/LTE_(telecommunication)• http://

www.4gamericas.org/index.cfm?fuseaction=page&sectionid=249• http://www.pcworld.com/article/259471/