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A mobile network development Net/Net and small cellsMita Gabriel1

 Abstract - In this paper I will briefly introduce the

method to improve the efficiency of cellular networks;

will explore some of the research issues and challenges; I

will describe briefly what the objectives of a drive test

and optimization are After that I will discuss how to

implement a heterogeneous network based on the micro!

pico and femto cells in "#$

#he energy efficiency but also improve %uality of 

services network in the cellular network is a growing

problem for mobile users not just to maintain profits but

also to reduce the effects of the environment #hese

tendencies for improving the network motivates theauthorities and users to investigate new technologies and

bringing an improvement to the entire infrastructure

I. INTRODUCTION

Mobile phone technology has dramatically grown inthe last ew years! a pro"e to that being theappearance o the smart phones and this trend is note#pected to ha"e a slowing in the near $t$re% this

technology is contin$o$sly impro"ed with newser"ices and inno"ati"e wireless de"ices in the $sersrange and proessional electronics &i.e photo camera!e'boo(s) sensors &ire alarms) par(ing car de"ices etc*long with this de"elopments came the need to $sethe ser"ices with a higher data transer capacity! th$sde"eloping the generation +G,UMT-&Uni"ersal

Mobile Telecomm$nications -ystem) $sing the present! and $sed so called picocells and emtocellswitch has "ery important parts in sa"ing energy inwireless networ( and increasing capacity o thenetwor(! this new trend has p$shed the researchers toa new and inno"ati"e demand called Green Cell$lar 

 Networ(s/ &0.g. o$r micro station co"ers better anarea than the macro station and $ses less energy). 

II. T0 23*NNING *ND O2TIMI4*TION O50T0ROG0N0OU- T030COMUNIC*TION

 N0T6OR7-

The e#ponentially increasing demand or higher datarates and other ser"ices in wireless networ(s re8$ires

a higher deployment o base stations networ( withinnetwor( cells. 6hile con"entional implementation

macro cell$lar networ( are less eecti"e! it is possible

that they are not economically le#ible by modiyingthe c$rrent networ( architect$re. Macro cells aregenerally designed to  pro"ide great co"erage and theyare not eecti"e to pro"iding  data at the high rate.

One ob"io$s way to ma(e cell$lar networ(s moreeicient in terms o energy in order to s$pport datatraic at high speed is decreased propagation distance between nodes! th$s red$cing transmission power.Thereore implementing sol$tion o the cell networ(9ased on the small cells s$ch as micro pico and emto

cells are "ery promising in this conte#t.

  5ig. 1. 0#ample o typical heterogeneo$s networ( 

 A. Femtocells

*re $s$ally placed in indoor en"ironments s$ch asho$se! b$ildings ware ho$ses! it ser"e rom : to +;$sers at the same time and ha"e a pretty smallco"erage! with a range $p to 1<m = 1;m! transmission power is also 8$ite low and somewhere below 1<<mw.

 B. Picocells

*re $s$ally $sed in open p$blic areas s$ch asshopping centers! railway stations! b$s stations! theycan ser"e m$ltiples $sers at the same time rom a

emtocell and has at the same time ;>< m6 to ; 6.

C. Microcells

*re $s$ally $sed o$tdoor with a pop$lation oc$sed inthe li"ing areas! ha"e a range o $p to ;(m and

s$pports higher data traic.

  5or planning a networ( we m$st (eep in mind?

1 5ac$ltatea de 0lectronic@ Ai Telecom$nicaBii! Departament$l

Com$nicaBii 9d. . 2r"an Nr. ;! +<<;;+ TimiAoara! e'mail geoEetc.$pt.ro

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  '-ignal obstr$ctions o "ario$s obstacles

&terrain! b$ildings! "egetation)'3oss o signal penetration inside b$ildings d$e

  '-ignal atten$ation $sers inside b$ildings'-ignal atten$ation d$e to the $se o body

III. DRI0 T0-T *ND O2TIMI4*TION

6hen yo$ are implementing a phone networ( ! aseries o meas$rements are needed in that area !in order to chec( the basic perormance o thisnetwor( ! ater that in the process o illing the"oids o signal and networ( optimiFation isnecessary to res$me the meas$rements in the area

to be able to renew inormation abo$t "ario$s parameters and their possible impro"ement. *tthe same time e#panding the networ( in

OptimiFation phase is challenging beca$se the  Initial perormance o the networ( m$st bemaintained ! while new additions assemblies andwe are re8$ent.0stimates o changes in the co"erage and 8$ality

o ser"ice o- &$ality o -er"ice ) beore

integration networ( new sites adHacent to thedeclaration that can be achie"ed allmeas$rements only .  To e#empliy this (ind o meas$rements wechose a site that ser"es the area where

2olytechnic Uni"ersity o Timisoara ' 5ac$lty o 0lectronics and Telecomm$nications is sit$ated %this meas$rement was $sed a scanner mobilenetwor( ! a mobile terminal and a G2- allconnected to a laptop and the parameters were?

*. R-C2' recei"ed signal code power9. 0c,Io ' Meas$red signal 8$alityC. R--I ' Recei"e -ignal -trength Indicator

5ig. ; Meas$rement in the 6CDM* radio interace

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Time Latitude LongitudeCPICH RSCP

(dBm)CPICH Ec/Io (dBm)

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