3gpresentation-151027074616-lva1-app6891 (1)

8/18/2019 3gpresentation-151027074616-lva1-app6891 (1)

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3G Tems Parameters Investigation and Drive Te

Syed Mohib Hussain (ZTE Engineer Team C-III)


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WCDMA


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What is Drive Test?

•The Drive Test is a test performed in cellular networks regardless of technology

!MTS, "T#, etc$ $$$% usually &erformed in order to naly'e and optimi'e the etwor

•Drive Test is used to analy'e and optimi'e the network *uality$

• lthough +y the analysis of &-.s we can identify pro+lems of &arametrical -ss

-nterference, Traffic etc$ etc0$% while the drive tests allow a deeper analysis in the

areas of each sector of coverage, interference, evaluation of network changes an

parameters$


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Why we Perform Drive Test?

• Every alive network needs to e !nder "ontin!es "ontrol to

maintain#im$rove the $erforman"e%

• &$timi'ation is the only way to kee$ tra"k of the network y

looking dee$ into statisti"s and "olle"ting and analy'ing drive

Test data%

• Drive Test hel$s o$eration and maintenan"e for tro!le shooting$!r$ose%


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WCDMA 3G (MT)


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Drive Test Tools

Tools !sed for 3g Drive Testing are enlisted elow*

Tems -nvestigation, emo , &ro+e for 1CDM (Software%

Doungle ("icense%

!ser #*uipment.s (Sonny #ricsson 1223%

Data card (4G supported for data testing%

G&S

Scanner

-nvertor


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+e"eived )ignal )trength Dedi"ated Gro!nd ,loor

Drive Test Ty$es*The main types of Drive Test are :

•&erformance nalysis•-ntegration of ew Sites and change parameters of #5isting Sites•Marketing•6enchmarking

Performance Analysis:

Tests for nalysis &erformance is the most common, and usually madeinto clusters (grouping of cells%, ie, an area with some sites of interest$

They can also +e performed in specific situations, as to answer a

customer complaint$


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-ew )ite .erifi"ation*

1hen the site is completely integrated , Drive tester team will start to perform siteinvestigation$

The detailed s!/a"tivities are o!tlined elow*

7$/igging udit

8$Site 9erification

4$:unctionality Test;s


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)ite .erifi"ation*


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Test Performed*

Test &erformed on a ew /oll out site are enlisted +elow=

•Sector Swap• udio calls•9ideo calls•/22•>S& (>SD& ? >S!&%•Cell /eselection•-/T (-nter /adio ccess technology%•Soft and Softer >andovers

•Coverage Test


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)ite .erifi"ation*

.oi"e # .ideo Calls.erify on $er 0asis for all "arriers*

•/SC&•#c@o•Scram+ling code•"C@/C•Cell -D•#tc etc$

Data and Thro!gh$!t Test*

1)DPA # 1)P(PA # +22Verify on per Basis for all carriers:

•RSCP•Ec/No•Scrambling code•LAC/RAC•Cell ID

•Max & Avg Throughu!•E!c e!c


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)tati" Test*

A!dio Call*

&erformed num+er of calls as defined +y the operator on all the three

sectors of sites in order to determine if any call failure , dropped or

+locked is found$

.ideo Call*

Aust "ike udio Calls num+er of video calls are also performed on all !he

!hree "ec!or" o# "i!e" in order !o de!ermine i# an$ call #ailure % droed or bloced

i" #ound' (ideo call #ound "hould be "ucce""#ul'

I! Tae" )*b/" da!a !o !ran"mi! a call'

+22* +elease 224

:irst Step dvancing toward Glo+al 4G network$ Can Support data rateupBto 4


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)tati" Test*

1)PA 1)DPA 5 1)(PA4*

>SD&=

>igh Speed downlink packet access is the total speed on a downlink channel

-deally on single carier >SD& will &rovide Data /ate upto 7


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Cell +esele"tion*• This test is performed to check weather

our cell is camping to +etter serving cell

or not in -deal mode while moving from

one node 6 to another or one Sector to

another$

• Specific Threshhold level will +eadFusted for this parameter$ -t

Commonly depends upon the /SC&

and #co$

Mostly -f #co #5ceeds B7< it will

/eselect a new cell$• :orcefully Test=

1CDM to forcefully on GSM

from -nter /adio access technology

option and then 6ack to 1CDM !e

should not e5ceeds from 8secs while

reselecting a 1CDM cell from o

Service mode to //C #asta+lished$


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Inter +adio A""ess Te"hnology I+AT4*

-nter /adio ccess Technology Test Tells us in case we are in dedicated mod

and some where coverage levels of 1CDM are degraded or we are coming

out from the coverage area of 1CDM then our call instead of Dropping simp

switched on to a GSM etwork$

Same like in this test we will check weather our cell is properly mapped with 8

desired cell and MSC or not and is properly switching to GSM or not$


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1andovers*Ty$es of 1and over*

6%)oft 1and over* Make 6efore

+reak$ 6etween two ode 6;s at a

time connecting with num+er ofcells and first of all making the

connection with +etter serving cell

then release$

7%)ofter 1andover* Make 6efore

+reak$ 6etween different sectors of

the same ode 6 and first of all

made the connection with +etter

serving cell then release$

3%1ard 1andover* 6reak +efore

make$ -ntra fre*uency handover in

1CDM$


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)e"tor )wa$*

• )e"tor )wa$ is one of the ma8or Test inG)M9CDMA9(MT)9:TE; Drive Testing%

• In WCDMA 3g )ites we "ommonly fa"ed a

"om$lete swa$ in a new roll o!t site%• )e"tor )wa$ in Tele"om means If yo! are

standing in the "overage Area of )e"tor 6 st

!t yo! are going to e served with 7nd se"tor and same like if yo! are standing in/

front of se"tor 7nd and serving "ell yo!

meas!res will e showing the res!lts ofse"tor 6st and same as In front of 3 rd )e"tor

yo! will e served y se"tor 7nd%• 1ere it shows anormal ehavior of the

network%• 0y se"tor swa$

and as a res!lts Dro$ "alls and level ofinterferen"e sho!ld in"rease !$ to its e=tent%


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Coverage Test*• Coverage Test is used toanalyze the network bymonitoring RSCP, EcNo, CQ,SR, !"ER etc etc#

• Coverage holes and others

$issing or %etective Neighborsn&ormation can be alsomeasured#

• !lock calls , %ro' calls,nter&erence , PS (ttachSuccess&ul and )ailure andother abnormal event can alsobe monitored#

• %i*erent Colour Coding showsthe Ranges o& di*erentParameters#

• $a' n&o Tool is commonly usedto Plot the ranges o& Power andnter&erence by using Thermatic#


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+adio Parameters*

• CPIC1 E"-o• CPIC1 +)CP• T= Power • (T+A Carrier +))I• )I+• Target )I+• )>I

• ++C )tate• Mode


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+adio Parameters*CPIC1 E"#-o*

Chip #nergy +y oise$ Common &ilot channel #co is the ratio of the energy of the

chip and the com+ined power of all the signals including the specific pilot channel$ -t also

shows the level of oise disrupting the specific C&-C>$

+anges for E"-o*

H to BI Good

BI to B7H A""e$tale

B7H to B4J 0ad

CPIC1 +)CP*

/eceived signal Code &ower is the level of the signal received +y the !$#$ or in

simple /SC& is the total power of the entire cell or a specific Common &ilot Channel

received +y the user #*uipment$

+anges of +)CP*

B4H to BI3 Good

BI3 to B3 A""e$tale

B3 to B7


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+adio Parameters*T= Power*

T5 &ower is the transmitting power of the mo+ile station$ -ts value can vary from

3H to B3H$

The minimum the T5 &ower of the mo+ile station the +etter it is for call *uality$

T5 &ower is the power of mo+ile station only measured in the dedicated mode andcommonly mo+ile will support the call in case when you are in a low coverage area it

will increase its own power to support your call avoiding Droped$

+))I*

/eceived Signal Strength -ndicator is the total power of the entire common pilot

channel received +y the Mo+ile station -ncluding eigh+ours interference and noise

as well of eigh+ours and it self also$

+))I +)CP @ E"-o

+))I +anges*

H to BI3 Good

BI3 to B3 ccepta+le

B3 to B7


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+adio Parameters*

)I+* Signal to -nterferance ratio is the ratio of

energy in the D&CC ( Dedicated &hysical

control channel% to that of the interferance

and noise received +y the !ser #*uipment$

Target )I+*

-t is the target signal to interferance ratiothat Mo+ile #*uipment is supposed to

achieve +y increasing or decreasing its

power$ -t is usually Set +y the use of &ower

Control &rocedure$


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+adio Parameters*

)>I*

-t is the speech *uality inde5 which is a parameter to rate the

voice *uality on that particular call$ -t ranges from H to 4H$ while

4H +eing the 6est 9alue$ daptive Multi /ate (M/% is also used to enhanced the speech

or the voice *uality of the specific call$

1CDM use M/ Sourc Coding$

M/ vary with different /anges >ighest M/ 9alue is 78$8H and

lowest M/ value is


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)erving and A"tive )et @ -eigho!r*

Cell I%D* This is the -dentity or name given to a particular ode 6 and its cells +y the

operator$

(A+,C-*

!niversal +solute radio :re*uency channel um+er is the fre*uency +and

allotted to the operator$ Ene Spectrum +and width is of 3M>' in 1CDM or 4G

:re*uency for !plink allotted to all the operators vary +etween 728H to 72H

M>$1hile

:re*uency for Downlink allotted to all the operators vary +etween 877H to 87IH

M>$


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)erving and A"tive )et @ -eigho!r*

Cell -ame*

Specific ame of the ode 6 alloted +y the Eperator according to its location and

)"ramling Codes* Scram+ling Codes are usually used to identified different cells of a node 6$

They are of Two types$

7B Secondary Scram+ling Code

8B &rimary Scram+ling Code

)e"ondary )"ramling Code*

!sed in a 6eam forming case$

Primary )"ramling "odes* (H to 377%

re actually the Scram+ling codes usually used to identified different sectors$ They tota

727$ More over 378 &SC are divided into a group of J


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)erving @ -eigho!rs

A)*

Set of Scram+ling codes on which the user e*uipment is currently latched on a

there can +e at least ma5imum three scram+ling.s codes in a ctive Set$

M-*

eigh+or cell that is detected +y user e*uipment as a neigh+or$ Soft and Softe

>andover decision should +e taken +y measuring the Stronger /SC& and #co

then that of ctive Set at least 48 eigh+or cells can +e added in a single 4g site

D-*

-t is also the neigh+or cell which is detected +y the !$# +ut is not defined in ournetwork$ >ence the !$# does not handover onto these cells$ -t can +e +ecause o

Evershooting, incomplete neigh+or list or in case of a new site, -t is very importa

optimi'e a network and have no D;s as they are one of the maFor reasons of ca

drops in 4G$


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1)PA and G)M :ine Chart*

• This window gives !s the data s$eed for oth 7G and 3G

de$ending on the mode of !ser e

downlink at that $arti"!lar $oint%• o! will find thro!gh$!t val!es in B#s%• +:C D: Thro!gh$!t average sho!ld e more than 2m#s%


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Pilot Poll!tion


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Pilot Poll!tion*


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3gpresentation-151027074616-lva1-app6891 (1)

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