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12 Δεκ 2013 (πριν από 3 χρόνια και 4 μήνες)

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LTE

Long 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

Competitor

WiMAX

vs

LTE

who 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

Spectrum

FDD (802.16m)

FDD and TDD

TDD

Spectrum flexibility

Fixed bandwidth

Flexible bandwidth

Services/Apps

IMS (IP Multimedia Subsystem)

Standards

IETF

3GPP

Problems of LTE

And 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 you

Now 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=2
49


http://
www.pcworld.com/article/259471/