E1-- Traffic Statistic Analysis

8/10/2019 E1-- Traffic Statistic Analysis

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ZTE University univ.zte.com.cn univ.zte.com.cn

The information contained in the file is solely property of ZTE corporation. Any kind of disclosing without permission is prohibited.

Traffic Statistics Analysis


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ZTE University univ.zte.com.cn univ.zte.com.cnThe information contained in the file is solely property of ZTE corporation. Any kind of disclosing without permission is prohibited.

Traffic Statistics is one of the basic method of evaluating GSMnetwor !uality. "adio #etwor $%timizer &"#$' can have abasic understanding to the overall networ %erformance bymonitoring traffic statistics data. GSM()SS system %erformancehas a so big effect to the networ !uality that "#$ %eo%leshould mae %eriodic analysis to traffic statistics data.

Traffic statistics data is the basis of analyzing networ

%erformance during o%timization* +ommonly used %erformance,nde-es include +ongestion "ate* +all dro% "ate* /andoversuccess "ate* T+/ allocation success "ate* etc0

Traffic statistics can guide you to analyze radio networ%roblems

,t is easy and fast to dealing with networ %roblems by way oftraffic statistic data


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State ZTE Traffic Statistics Function

Understand the meaning of common

traffic statistic indexes

Analyze and Locate the network

prolems through Traffic statistic analysis

After completing this course, youcan


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Chapter One Introduction to ZTE Traffic Statistics

Chapter Two The meanings of Traffic statistic indexes

Chapter Three Locate the networ pro!lems through Traffic

Statistics


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ZTE Traffic Statistics Function

!S Ser"ice asic measurement

#TS measurement

$adio measurement

A %nterface measurement

$esources seizure measurement

&S Ser"ice measurement


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' !S Ser"ice asic measurement (!ommon)

+S )asic measurement is used to generate basic %erformance re%ort*

Statistics involve resource availability* service and channel !uality that reflect the

overall networ %erformance

* +, -odule -easurement

12 module measurement is an analogy for )S+ measurement. Statistics

involve assignment* handover and +3U load. The statistics is mainly for "MM. 4or

the SMM* the statistics only involves the +3U load.

, +, !ell and #TS -easurement

5escribes the 12 +ell and 12 )TS Measurement +ounters. These counters

%rovide statistics for received signal level* received signal !uality and call distance.

6.6 +S +S Service basic measurement


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' &ower !ontrol &erformance -easurement (!ommon)According to the receiving signal level and !uality from MS and )TS measure re%orts*

)S+ determine whether to %rocess %ower control to )TS and7or MS and mae statisticfor various %ower control reasons. Average u%7down lin signal strength.

* T$. ser"ice -easurement (!ommon)T"8 Service Measurement %rovides statistics of all the events relating T"8. ,t involves

the measurement counters* which ee%s the statistics such as+hannel

Activation75eactivation* /andover Success74ailure* +arrier 4re!uency interferenceband* Ma-imum and minimum u%lin signal level

, &aging message -easurement3aging messages measurement %rovides statistics of discard +ircuit Switched &+S'

and 3acet Switched &3S' %aging messages due to full !ueue length. Measurement

unit is T"8.

/ T$. #asic -easurementT"8 basic measurement %rovides statistics of time slot seizures in T"8. T"8 )asic

Measurement +ounters %rovides information such as time duration and number of

T+/ and S5++/ seizures.

)TS Measurement


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' !ell radio -easurement (!ommon) Measure the channel interference and service 1uality under both idle and

occu%ied state.

* $andom Access -easurement

"andom access measurement %rovides statistics such as number of "andomaccess attem%ts* "andom access %rocesses* Successful random accesses

, S0!!1 -easurementS5++/ +ounters %rovide statistics about S5++/ allocation* S5++/ seizure*

S5++/ assignment

/ T!12F -easurementT+/74 measurement counters %rovide statistics for the following channels

T+/74 allocation re!uests* T+/74 allocations* T+/74 assignment re!uests*

T+/74 assignments* T+/74 handover re!uests* T+/74 handovers

"adio Measurement


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3 SA&%, -easurementThe SA3, is a 9(bit field in :A35m and defines the ty%e of user to which a

message is addressed. SA3, value e!uals to three &SA3,;2' is used for

Su%%lementary Services &SS' and Short Messages Services &SMS' on Air(

interface.,t %rovide counters for the number of SA3, lin establishment*successful lin establishment and 5TA3 messages

4 $-- Assignment -easurement"MM Assignment Measurement %rovides the statistics of radio channel

assignment in "MM.

5 $-- !all 0rop -easurement"MM +all 5ro% +ounters %rovide statistics such as

S5++/* T+/74* and T+/7/s status.Signalling* voice* and data ty%e services.

+all dro%s due to connection loss between "MM and SMM

)TS(site radio lin failure and :A35 lin failure.

+all dro%s due to $M+(" force release.

"adio Measurement


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6 1ando"er cause -easurement (!ommon)

/andover +ause +ounters %rovides statistics for number of handover outattem%ts due to various handover causes. )S+ determines the handover u%on

MS7)TS measurement re%ort. /andover measurement re%orts are of great

significance at the time of evaluation* ad


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'* &aging -easurement,t %rovide statistics for number %aging messages send to each relevant

cell after )S+ receives the %aging command from A(interface.

', Ais;%nterface -easurementThese counters ee% the statistics of all the messages that )S+ receives

or send on the Abis(interface.

'/ $esource A"ailaility -easurement,t %rovide statistics of channels utilization in a cell.

#umber of available S5++/*T+/7/ and T+/74

Average and ma-imum busy !uantities* Total busy time

Total congestion time in cell* Statistical unit is cell.

'3 1alf $ate Statistics/alf "ate Measurement %rovides statistics for the /" related services

and resources.

"adio Measurement


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' A %nterface Signaling -easurement)SSA3 Message +ounters

)SSMA3 Message +ounters

)SSMA3 include all messages e-changes between )S+ and MS+ that are

actually %rocessed by the )S+. E-am%les are 3aging* /andover and "eset

messages.

5TA3 messages com%rise all messages e-changed between subsystem of

the #SS and MS. 5TA3 messages are trans%arent for the )SS.* A %nterface Ser"ice measurementThese +ounters %rovide statistics for the successful and failed

assignments* handover and call dro% due to different causes

, S!!& !onnection !ounters and Terrestrial resources -easurementS++3 +onnection +ounters %rovide statistics for S++3 messages that are

used to setu% an S++3 connection.

Trun +ircuit counters %rovide statistics for the all the )S+ trun circuits.

Such as #o of available7unavailable and busy trun circuits*

total busy7congestion time of trun circuit

A ,nterface Measurement


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' T$. LA&0 Link -easurement:A35 :in +ounters %rovide statistics for the T"8 :A35 board*

which transfers the signaling messages to its contiguous layers.

*


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6 3S )asic Measurement3rovide statistics for 3S basic %erformance re%ort including resources*

services and channel !uality which reflect the overall 3S networ

%erformance

> #S Sub :ayer Measurement #S sub layer counters taes #S?+ as measurement unit. These counters

%rovide statistics such as data transmission* signaling interaction* and

abnormal lin transmission of #S?+ lin.

2 )SSG3 Measurement 3rovide statistics for signaling information in )SSG3 layer relating to

G3"S service in Gb interface

@ #SE Measurement These counters taes #SE as measurement unit. 3rovide statistics such

as number of %aging* status message* signaling )?+ reset

3acet Switch Service Measurement


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3S Traffic Statistics Measurement3+U records the values of Traffic Statistic +ounters and sam%les every five

minutes. The statistic unit of 3S traffic statistic counters is cell.

9 "esource Management Measurement3rovide statistics with relation to the use of )S+ system resource such as

the number of cell attem%t* available 35+/

3acet Switch Service Measurement


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' !S #asic -easurement

6.B !"#

* T$. Ser"ice -easurement

, Ad:acent !ell 1ando"er -easurement

/ !ell $adio -easurement


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Statistics


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Explanation ,t measures access re!uest messages send from )TS to)S+ C+hannel "e!uiredD.

Formula +6692 $ S5++/ attem%t total number % ;+666 $ #umber of S5++/ seizure attem%ts &used for assignment'F +66@ $ #umber of S5++/ seizure attem%ts &used for

handover' %

Explanation ,t means all the unsuccessful re!uests for S5++/

channels because there is no radio resource."ormula +669@ $ S5++/ total overflow % ; +662 $ #umber ofS5++/ seizure failures &used for assignment 'F +669 $ #umber ofS5++/ seizure failures &used for handover %

& '()*

The total number of S5++/ call attem%t

The total number of S5++/ overflow


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Explanation ,t mean the statistics of the failed calls before T+/ is occu%iedafter the S5++/ is allocated* including the call failures in that %hase caused by

Abis interface connection failures* :A35 lin interru%tion and other causes.

Formula +669 $ #o of S5++/ +all 5ro% % ; +69@2 $ #o of S5++/5ro%%ed +alls %

Explanation SDCCH Total Traffic of busy hourFormula !''494 $ S0!!1 total usy hour % >!''39/ $ Total

numer of occupied S0!!1 % Total S0!!1 traffic>!''4942 Statistic 0uration

#umber of S5++/ +all dro%

S5++/ Total busy hour Traffic

& '()*


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& '()*S5++/ Measurement 3oint

-S #TS #S!

!1L?$E+

!1L?$+0

A'

!1L?A!T

!1L?A!T?A!@

A*

%--?ASS?!-0

%--?ASS

SA#-

EST?%0

A,


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Explanation The total call attem%ts number of the s%eech channels &notinclude handover' means all the re!uests for T+/ channels* including the

calling attem%ts and called attem%ts* including the case of T+/ channel is

assigned as S5++/ in abnormal early allocation* not including different

handover cases.

Formula !''497 $ Total call attempts numer of T!1 (not include hando"er% >

+626 $ #umber of T+/74 seizure attem%ts &signaling' &used for assignment' 'F +62> $ #umber of T+/74 seizure attem%ts &voice' &used for assignment' % F +626 $ #umber of T+/74 seizure attem%ts &data' &used for assignment' % F

+6@6umber of T+/7/ seizure attem%ts &signaling' &used for assignment' F

+6@> $ #umber of T+/7/ seizure attem%ts &voice' &used for assignment' % F+6@6 $ #umber of T+/7/ seizure attem%ts &data' &used for assignment' %

Total call attem%ts of T+/ &not include handover'


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Explanation The total call attem%ts of the s%eech channels &includehandover' means all the re!uests for T+/ channels* including the calling

attem%ts and called attem%ts* including the case T+/ channel is assigned as

S5++/ in abnormal early allocation* including different handover cases anddirect retries.

Formula +66966 $ Total call attem%ts of T+/ &include handover' % ;+669 $ Total call attem%ts number of T+/ &not include handover % F+62@ $ #umber of T+/74 seizure attem%ts &signaling' &used for handover'' F

+62>2 $ #umber of T+/74 seizure attem%ts &voice' &used for handover'' F+62@ $ #umber of T+/74 seizure attem%ts &data' &used for handover'' F+6@@ $ #umber of T+/7/ seizure attem%ts &signaling' &used for handover'' F+6@>2 $ #umber of T+/7/ seizure attem%ts &voice' &used for handover 'F+6@@

$ #umber of T+/74 seizure attem%ts &data' &used for handover' '

The total call attem%ts of T+/ &include handover'

& '()*


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Explanation The total overflows of the s%eech channels &not includehandover' means all the unsuccessful re!uests for T+/ channels because

have no radio resource* including the T+/ setu% failures after the calling or

called seizes S5++/ channel* including the case T+/ channel is assigned

as S5++/ in abnormal early allocation0 not including different handovercases.

Formula +6696 $ Total overflows of T+/ &not include handover' '; +622 $ #umber of T+/74 seizure failures &signaling' &used for assignment' 'F

+62>> $ #umber of T+/74 seizure failures &voice' &used for assignment' 'F+622 $ #umber of T+/74 seizure failures &data' &used for assignment' 'F+6@2 $ #umber of T+/7/ seizure failures &signaling' &used for assignment'' F+6@>> $ #umber of T+/7/ seizure failures &voice' &used for assignment' 'F

+6@2 $ #umber of T+/7/ seizure failures &data' &used for assignment''

The total overflows of T+/ & not include handover'


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Explanation The total overflows of the s%eech channels &include handover' meansall the unsuccessful re!uests for T+/ channels* including the T+/ setu% failures after

the calling or called seizes S5++/ channel* including the case T+/ channel is

assigned as S5++/ in abnormal early allocation* including different handover anddirect retries.

Formula +6696> $ Total overflows of the s%eech channels &include handover' ;

+6696 $ Total overflows of T+/ &not include handover' 'F +629 $ #umber of T+/74 seizure failures &signaling' &used for handover''F +62> $ #umber of T+/74 seizure failures &voice' &used for handover''F

+629 $ #umber of T+/74 seizure failures &data' &used for handover''F+6@9 $ #umber of T+/7/ seizure failures &signaling' &used for handover %% F+6@> $ #umber of T+/7/ seizure failures &voice' &used for handover'' F+6@9 $ #umber of T+/7/ seizure failures &data' &used for handover %%

Total overflows of T+/ & include handover'

& '()*


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Explanation Total seizure number of T+/ means all the successful re!uestfor T+/ channels in air interface.

Formula !''4', $ total seizure numer of T!1 % >

+62> $ #umber of T+/74 seizure successes &signaling' &used for

assignment''F+62 $ #umber of T+/74 seizure successes &signaling' &used for handover''F+62>6 $ #umber of T+/74 seizure successes &voice' &used for assignment''F+62>@ $ #umber of T+/74 seizure successes &voice' &used for handover''F+62> $ #umber of T+/74 seizure successes &data' &used for assignment''

+62 $ #umber of T+/74 seizure successes &data' &used for handover''F

+6@> $ #umber of T+/7/ seizure successes &signaling' &used forassignment''F

+6@ $ #umber of T+/7/ seizure successes &signaling' &used for handover''F+6@>6 $ #umber of T+/7/ seizure successes &voice' &used for assignment''F+6@>@ $ #umber of T+/7/ seizure successes &voice' &used for handover''F+6@> $ #umber of T+/74/ seizure successes &data' &used for assignment''+6@ $ #umber of T+/7/ seizure successes &data' &used for handover''

Total seizure number of T+/ &include handover'


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Explanation ,t means the statistics of the call dro%s caused by radio factors after thes%eech channel is allocated successfully to the user* including the call dro%s during handover

and after handover.

Formula +6696@ $ Total number of call dro%s % ;+69@@ $ #umber of T+/74 dro%%ed calls F +69@ $ #umber of T+/7/ dro%%ed calls %

Explanation The total busy hour of T+/ is the sum of occu%ation time of all

the current occu%ied s%eech channels.Formula !''4'3 $ Total usy hour of T!1 % > !''397(-aximum usyT!121) B !''3'/(-aximum usy T!12F)

Total T!1 traffic > !''4'32 statistic duration

Total number of T+/ call dro%s

Total busy hour of T+/ traffic

& '()*


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T!1 -easurement &oint

-S #TS #S!

#'!1L?A!T

ASS?!-0

#*

ASS?!-0

ASS?!-0

SA#-

EST?%0

#,

-S!

!1L?A!T?A!@

UA

ASS?!


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Explanation The total !uantity of handover re!uests means the total handoverre!uests of the system within a cell* and between the cells of the same )S+ or

different )S+sFormula !''4'4 $ total numer of hando"er reDuests % >+66 $ #umber of )S+ controlled outgoing inter(cell handover attem%ts % F+666$ #umber of )S+ controlled incoming inter(cell handover attem%ts % F

+6@$

#umber of MS+ controlled outgoing handover attem%ts%

F+66@ $ #umber of MS+ controlled incoming handover attem%ts % F+6H6 umber of intra(cell handover attem%ts'

Total number of handover re!uests

& '()*


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Total number of successful handovers

Explanation The total !uantity of successful handovers means the total successfulhandovers of the system within a cell* and between the cells of the same )S+ or different

)S+s

Formula +6696B $ total number of successful handovers % ;

+62 $ #umber of )S+ controlled outgoing inter(cell handover successes % F +662 $ #umber of )S+ controlled incoming inter(cell handover successes % F

+66 $ MS+ controlled outgoing handover successes % F+6> $ MS+ controlled incoming handover successes % F+6H>umber of intra(cell handover successes'


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1ando"er -easurement &oint '

-S #TS #S!

!'!1L?A!T

!*

ASS?!-0

ASS?!-0

SA#-

EST?%0

!,

-S!

!1L?A!T?A!@

UA

ASS?!


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1ando"er -easurement &oint *

FigC' 3 1ando"er %n under -S! control FigC' 4 1ando"er


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TC# congestion rate $exclude hando%er&; Total overflows of

T+/ &e-clude handover' 7 Total call attem%ts number of T+/

&e-clude handover'I6J

TC# congestion rate $include hando%er&; Total overflows of

T+/ &include handover' 7 Total call attem%ts number of T+/

&include handover'I6J

T+/ congestion rate

& '()*


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S5++/ congestion&J' ; $ S5++/ total

overflow 7S5++/ total attem%ts%

I6J

S5++/ congestion rate


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T+/ call dro% rate ; Total number of T+/ call

dro% 7 Total seizure number of T+/ & include

handover' I 6J

S5++/ call dro% rate ; total number of S5++/

call dro% 7 Total seizure number of S5++/I 6J

T+/ call dro% rate

S5++/ call dro% rate

& '()*


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+all dro% rate of Traffic

Explanation the time duration between two call dro%s &minute'

"ormula +all dro% rate of traffic + $ Total traffic of

T+/ $ E": % K9 % 7The number of T+/ call dro%


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"adio +onnection Success "ate

"adio +onnection Success "ate+ &6(S5++/ in

congestion rateJ'I&6(T+/ in congestion rate J&include

handover''

,m%ortant L3, reflect the radio service %erformance

& '()*


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/andover Success "ate$ J% ; #umber of

successful handovers 7 #umber of handover

re!uests I6J

/andover Success "ate

& '()*


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The number of cells whose T+/ congestion rate

&e-clude handovers' J* or T+/ call dro%

rate2J

Average traffic7 %er T+/ .6Erl

)ad +ell

& '()*


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A%erage traffic ' per channel ( )*+Erl

A%erage traffic ' per channel )*- Erl

)usy +ell

,dle +ell

& '()*


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Statistics


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.asic /rocedure

Call drop analysis

#ando%er analysis

TC# Congestion analysis

S0CC# Congestion analysis

TC# Allocation success rate


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General

)SS 3erformance "e%ort)SS 3erformance "e%ort

/igh +all dro%/igh +all dro% /igh +ongestion/igh +ongestion :ow /andover:ow /andover

A

:

A

"

M

A

:

A

"

M

CSBasicMeasurement

TRXService

Meas

urement

CellRadio

Measurement

CSBasicMeasurement

A

:

A

"

M

A

:

A

"

M

CellRadio

Measurement

CSBasicMeasurement

Radioaccess

Mea

surement

A

:

A

"

M

A

:

A

"

M

Handovercause

Measurement

GeneralHandovert

AdjacentcellhandoverMeasurement


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+ombined with

Driving Test:

CQT:

Signaling trace1


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Call Drop Type

T+/ +all 5ro% Analysis

"adio lin 4ailure

:A35 :in 4ailure

/andover 4ailure

Statistic point: BSC send CLEAR-REQ


45/90


Radio link Failure $Ater TC! assign"ent%



46/90


!andover Failure call drop


A'

#S!#TST$.-S

ASS%8-ET !


47/90


5etect and Statistics

Ghen #S! recei"ed

!


48/90


+auses for +all dro%

,nterference $ ,nternal* E-ternal %

)ad coverage $ )lind area :onely ,sland %

Unreasonable /andover$ #eighbor cell %lan /andover

%arameters %

U%75own lin unbalance $ TTA 3AAntenna direction %

Unreasonable radio %arameters

/ardware %roblem $ :A35 +MM T"8 3A +5U

TTA%

Transmission


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+ommon 3rocedure

+ustomer com%laint

Alarm from $M+"

3erformance "e%ort $ +ell re%ort )asic measurement ,nterference

band % +hec %lanning data

$bserve call dro% reason

+reate observe tas for handover failure in order to confirm handover

failure direction

Trace A),S signaling* ca%ture abnormal signaling $ +$## 4A,: ,#5 %

5T and +1T


50/90


6.,nterference &,nternal and e-ternal'

Check traffic statistics

+hec the relationshi% between interferenceband and time* traffic.

)loc T"8 in turn to observe the changes ofinterference band

+hec the ratio of handover due to %oor!uality to the overall handover

+hec +ell radio measurementdata, analyze the distribution of signalstrength and !uality


51/90



Co""on Reasons

4re!uency reuse

Unreasonable fre!uency %lan or coverage.

The radio of handover due to %oor !uality to the total handover.

Unreasonable %arameters $ such as 53+ not o%en Too big

)TS minimum out%ut %ower %

E-ternal interference $ Microwave sys EM, %

)TS hardware %roblem

,nterference from 5irect am%lifier


52/90


6. Interference (Internal and external

Solution

5riving Test +hec the interference area and signal !uality distribution

Modify cell out%ut %ower* antenna tilt down angle

Modify fre!uency %lan $ carrier fre!uency* fre!uency reuse %attern %

Search e-ternal interference source via fre!uency analyzer

$%en 4/*5T8*53+

"emove hardware %roblem &T"8* antenna intermodulation'


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E#ternal $ntererence


54/90


>.+overage &)lind area ,solated island'

Check statistics

3ower control measurement :ow average u%lin7downlinsignal strength

+ell radio measurement Too much low signal strength

/andover reasons /andover due to low signal strength


55/90


>.+overage &)lind area ,solatedisland'

Common reasons:

,solated island Untimely handover

$ver coverage

Unreasonable neighboring cell

3oor coverage


56/90


57/90


2.Unreasonable handover Check statistics:

+hec handover %arameters if reasonable

General /andover measurement chec handover failure direction

/andover reason measurement +hec different handover reason

ratio

Ad


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2.Unreasonable handover

Solution:

Add ad


59/90


@.U%lin75ownlin Unbalance &TTA

3A

5irection'

C%eck:

+hec C+S )asic measurementD and C3ower control

%erformance measurementD to analyze U%lin75ownlinreceived level

Analyze the U%lin 7 5ownlin received level via signaling

tracing


60/90


@.U%lin75ownlin Unbalance &TTA 3A 5irection'

Solution:

+hec TTA +5U "5U )TS board and "4 cableconnection

+hec antenna system Antenna direction* tiltdown04eeder cable Num%er connections* various connectors*?SO"


61/90


.Unreasonable %arameters

C%eck:

"adio %arameters

&"8AM

":T

/$3

/andover %arameters ' Solution:

Modify unreasonable %arameters


62/90


9./ardware %roblem &T"8 3A TTA'

C%eck:

+S basic measurement T+/ available rate

)S+ overall %erformance measurement Assignment failure

$M+" channel allocation observation 3art of T"8 can not be

allocated

Solution:

$bserve transmission and board alarm $ T,+* A interface 3+M

loss of frame* :A35 brea* 3A* T"8 %


63/90


B. +all dro% e-am%le6

+all 5ro% e-am%le

5escri%tion site A cell 6 and 2 had

high call dro% rate

Analysis +hec statistic data* "4failure call dro%0 +hec

radio %arameters* found co(

fre!uency e-ist in cell 6 and

cell 2

Solution +hange carrier fre!uency

of cell 6

01 230145 61 789:9;

>

@=A

@=A

@ 01EFG

HIIJ:IJ:HI

KLM 4NOPNQ

4.R 789STUU:9;HJUVW WW UUWU JXWS

HIIJ:IJ:HU

KLM 4NOPNQ

4.R 789STUU:9;HJUVW YH SVI YXWV

HIIJ:IJ:HY

KLM 4NOPNQ

4.R 789STUU:9;HJUVW TH UIYS TXIT

8Z01@ Z@1\C1]^_ /`aCb061]0

HIIJ:IJ:HVKLM 4NOPNQ

4.R 789STUU:9;HJUVW T UIJV IXYV

HIIJ:IJ:HS

KLM 4NOPNQ

4.R 789STUU:9;HJUVW T SWJ IXTW


64/90


B. +all dro% e-am%le >

+all dro% due to

interference

5escri%tion +ell 2 of one site had

high call dro% rate

Analysis +hec call dro% ty%e

most are due to handover

failure0 +hec cell fre!uency

and ad


65/90


/andover Analysis

Low hando%er success rate

#ando%er measure Alarm $cloc, hardware&CS !asic measurement

Ad4acent cell5eneral hando%er

#ando%er o!ser%eIntra3.SC hando%er

Inter3.SC hando%er

#ando%er reason

- Le%el6 7uality

8 /.5T9 Interference: Others


66/90


General Ste% for handover

6 3roblem cells All cell or individual cell

%roblem

> /andover direction $ut(going handover or

,n(coming handover

2 /andover ob


67/90


/andover L3,

6 +ells with low handover success rate

> +ells with large numbers of handover failures

2

The ratio of out(going handover failure to ,n(cominghandover failure

@ /andover failure characteristics All cells or individual

cellQ Ohat ty%e of handover failureQ


68/90


3robable causes for low handover success rate

Unreasonable handover %arameters

/ardware failure $ T"8 failure %

,nterference

+overage

U%lin 7 5ownlin Unbalance

+loc %roblem &,nternal cloc unstable cloc of u%%erlevel'


69/90


6. Unreasonable %arameters

+hec handover threshold* handover switch

The ratio of T+/ seize number due to handover to that

of calling - 2 , there may be %ing(%ang handover,modify minimum handover %eriod and 3)GT margin


70/90


>. /ardware %roblem

Analy&e:

+ells with low in(coming handover success rate

The neighboring cells of the cell with low out(going

handover success rate

C%eck data:

+/ A+T with +/ #A+ $" T,ME$UT

T+/ Available rate is abnormal

Too much :A35 call dro%

,f the cell got both /igh call dro% rate and congestion

rate , maybe there is %art of hardware failure in the cell


71/90


2. others

After eliminating unreasonable %arameters*

hardware failures and congestion %roblems , "efer

to T+/ call dro% analysis method

Instances for #ando%er failure


72/90


Instances for #ando%er failure

2!"#$%

8 14&' ( )*+-./012

256-7 89:;!"#

'0

!"#

T+/ +ongestion


73/90


'ro(a(le causes:

T+/ +ongestion

+a%acity

,nterference

+overage

Antenna and 4eeder system %roblem

Unreasonable %arameters


74/90


6. +a%acity limit or unbalance traffic

Traffic %er channel .9 Erlang

Too much overflow

Unbalance traffic$ sectors within one site or among

several cells %

Severe congestion


75/90


6. +a%acity limit or unbalance traffic

Solution:

E-%ansion or ad


76/90


>. ,nterference

+7, is too small to mae successful assignment %rocess and cause

T+/ seize failure

C%eck and solution:

"efer to T+/ call dro%


77/90


78/90


@. Unreasonable %arameters

C%eck:

"8AM +"$*T$*3T

Solution:

Ad


79/90


. +overage &blind area lonely island'

Solution:

Same as T+/ call dro%

S5++/ +ongestion


80/90


g

Main Reasons

for SDCCH

Congestion

Unreasonable

%arameters

System ca%acity limit

Unreasonable :A+

,nterference


81/90


6. Unreasonable %arameters

C%eck:

,mmediate assignment success rate H gESTP,#5 7 ,MM ASS

"andom access reason &+alling "es%onse

calling

:ocation u%date

SMS'


82/90


Solution:

Modify MA8"ET"A#S , T-P,nteger

3arameters regarding to :ocation U%date +"$*+S/*

T26>>

,n 5ual band networ* Ad


83/90


>. System +a%acity :imit

)oarder between :A+ "ailway

station* ,nstant :arge number of:ocation U%date

Add S5++/ or Add T"8 h


84/90


85/90


@.,nterference

"A+/ access threshold is too low and at the same

time there is interference,

the system will regard the

interference as S5++/ re!uirement


86/90

01/19/15


T+/ assignment failure "ate

;CAssignment "e!uestD 7 CAssignment 4ailure F +lear

"e!uestD

TC# assignment failure rate


87/90


i29

8bb3j]61]0 9=66/]`

9k/]]1> 8^03l/03=]

9k/]]1> 8^03l/03=]8^m

8bb3j]61]0 n/3>C@1$ U%

o29 iC@1$ H%

8bb3j]61]0 9=66/]`

28io

q8

8bb3j]61]0 9=6A>1018bb3j]61]0 9=6A>1018bb3j]61]0 9=6A>101

8bb3j]61]0 n/3>C@1$ Y%

rs8bb3j]61]0 n/3>C@1$ U% i29 Z/3> 0= ^=6A>101 o29 @1\C1b08bb3j]61]0 n/3>C@1$ H% i 0= ^=6A>101 i29 ^k/]]1> / 03l/03=]8bb3j]61]0 n/3>C@1$ Y% o2 Z/3> 0= ^=6A>101 i29 /bb3j]61]0 ^=66/]`


88/90

01/19/15


;eason1

T;< "ailure

Interference

;adio en%ironment affect

If >10% TRX Failure

10%--5% TRX Failure or Interference

3%--5% Blocking or interference

< 3% Radio environment affect


89/90

01/19/15


+hec

R Too much Traffic E-%ansion Traffic balance

R ,f "adio %arameters correct such as 4/ %arameters 4re!uency

R +hec )E" ,nterference )and 5ecrease radio interference

R +hec cell hardware T"8 +5U "4 cables connection

RAntenna and feeder system ?SO"

,Misconnection of feedercables* antenna direction consistency

Instances for TC# assignment failure


90/90

Instances for TC# assignment failure

2?@AB CDE

FG!"#

H

Date post:	02-Jun-2018
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E1-- Traffic Statistic Analysis

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