pptonfemtocell

7/25/2019 pptonfemtocell

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CS-'A'

FEMTOCELL

Guided By: Submitted By:

Miss Pooja Jain Nain !uma" S#a"ma

$o%% no&:'(')CS*+,-')

S.$/ 0A/S.NA0 /NST/T1TE OF

TEC.NOLOG2 3 SC/ENCE4 /NO$E


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Introduction

A femtocell is a small cellular base station designed for use in residential or small busineenvironments

It connects to the service providers network via broadband (such as DSL or cable) a

typically supports to ! mobile phones in a residential setting

A femtocell allows service providers to e"tend service coverage inside of your home

especially where access would otherwise be limited or unavailable # without the need

e"pensive cellular towers

It also decreases backhaul costs since it routes your mobile phone traffic through the

network

A femtocell is sometimes referred to as a %home base station&' %access point base statio

% access point&' %small cellular base station& and %personal # base station&


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*istory +n ,emtocell

-he first interest in femtocells started around .. when a group of engineers at /otorola

were investigating possible new applications and methodologies that could be used with

mobile communications0

A couple of years later in ..1' the idea was beginning to gain some momentum and a

variety of companies were looking into the idea0

2ith the idea gaining momentum' and many more companies investigating femto cell

technology' the ,emto ,orum was set up in 3uly ..40 Its aim was to promote the wide#scale

adoption of femtocells0 2ith mounting industry pressure to be able to deploy femto cell

technology' the ,emto ,orum also played a coordinating role in ensuring that the standards

were agreed and released as fast as possible0


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*ow does femtocell works 5


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2hy ,emtocell 5

-echnical motivation

6educed separation distance between transmitter and receiver

Interference is isolated by building structure

Limited number of users

7usiness motivation

*alf of voice calls and a ma8ority of data traffic originate indoor

+perators e"pand network capacity and coverage without much investments on

infrastructure0

Subscribers get better radio service at low price


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Definition 9 Differentiation +f,emtocell Femtocell Picocell Wif

Site Rental customer operator customer

Installation customer operator customer

Electricity Bill customer operator customer

Radio Planning no (local) yes (prior & global) no

Backhaul

Connection

via customer dedicated via customer

Macrocell

Interaction

not (yet) yes not applicable

Transmission

Poer

< 23dBm 23-30dBm 20dBm

!ccess Rights mainly closed public closed

"ando#er possible yes vertical

Photo


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,eatures of ,emtocell

+perates in the licensed spectrum

:ses fi"ed broadband connection for backhaul

It is managed by the ;A$

-he backhaul service provider may be different from ;A$


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:sers 7enefits

- 6educed %in home& call charges0

-

Improved indoor coverage (7ase station in your bedroom)0- =ontinued use of current handset0

- 6educed battery drain0

- ,ast


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+perators benefits

- Improves coverage0

- 6educes backhaul traffic0

- $rovides capacity enhancements0

- 6educes churn0

- >asy 6adio =overage for rural areas0

- 2here there is ADSL you can have mobility0

- Stimulates usage0

- Addresses the fi"ed mobile convergence market with a highly attractive and efficient

solution0


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Advantages +f ,emtocell

*& Lo5 ei6e Cost: efficient' low#cost power amplifiers' highly sensitive receivers' fle"ible channel

bandwidth' reliable 6, filters? low cost and low power implementation? etc0)& System /nte"7e"en6e Mana8ement:

minimi@e interference to macro (and vice versa)? minimi@e interference to ad8acentfemtos? coping with unplanned rollouts? coverage estimation' interference cancellation?etc0

,& Femto6e%% Ca9a6ity Maimi;ation: link and access management (handover' admission control' resource management' load

balancing and flow control)? dynamic bandwidth allocation and sharing? etc0

+& Ba6


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Disadvantages +f ,emtocell

*& .i8# P"i6e (about B..)0

)& i77i6u%t to /nsta%%:

=abling' root access ' etc0

,& e9endent on si8na% on nea"est 6e%% to5n&

+& $e>ui"es b"oadband 6onne6tion&

=& /t does not 9"oides 8ood 6onne6tion in outdoo"&


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=onclusion

,emtocell e"tends the high#data rate service coverage of :/-S to indoor environment *igher spectral efficiency due to short range and well isolation 2ith massive deployment' a solution for ubiCuitous mobile broadband access

A range of case studies verify =S femtocell operation Interference locally distributed ,le"ible spectrum scheme is efficient to reduce uplink outage rate

/obile teletrauma use case 2ith a certain level of femtocell penetration ratio' the service can be delivered with sufficient low

outage rate

At least an order of magnitude reduction in service outage rates when femtocells are utili@edcompared with macrocell only case

Downlink direction study is also interesting and beneficial to complete the use

case study0 In the long term' the research direction is L-> femtocell0


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