E1-- Traffic Statistic Analysis
Transcript of E1-- Traffic Statistic Analysis
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Traffic Statistics Analysis
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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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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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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 ¬include 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+/ ¬ 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+/ ¬ 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 ¬ 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+/ ¬ 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+/ ¬ 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
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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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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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.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
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Radio link Failure $Ater TC! assign"ent%
T+/ +all 5ro% Analysis
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!andover Failure call drop
T+/ +all 5ro% Analysis
A'
#S!#TST$.-S
ASS%8-ET !
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5etect and Statistics
Ghen #S! recei"ed
!
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+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
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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
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6.,nterference &,nternal and e-ternal'
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
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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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6.,nterference &,nternal and e-ternal'
E#ternal $ntererence
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>.+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
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>.+overage &)lind area ,solatedisland'
Common reasons:
,solated island Untimely handover
$ver coverage
Unreasonable neighboring cell
3oor coverage
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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
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@.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
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@.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"
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.Unreasonable %arameters
C%eck:
"adio %arameters
&"8AM
":T
/$3
/andover %arameters ' Solution:
Modify unreasonable %arameters
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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 %
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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
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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
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/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
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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
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/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
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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'
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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
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>. /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
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2. others
After eliminating unreasonable %arameters*
hardware failures and congestion %roblems , "efer
to T+/ call dro% analysis method
Instances for #ando%er failure
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Instances for #ando%er failure
2!"#$%
8 14&' ( )*+-./012
256-7 89:;!"#
'0
!"#
T+/ +ongestion
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'ro(a(le causes:
T+/ +ongestion
+a%acity
,nterference
+overage
Antenna and 4eeder system %roblem
Unreasonable %arameters
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6. +a%acity limit or unbalance traffic
Traffic %er channel .9 Erlang
Too much overflow
Unbalance traffic$ sectors within one site or among
several cells %
Severe congestion
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6. +a%acity limit or unbalance traffic
Solution:
E-%ansion or ad
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>. ,nterference
+7, is too small to mae successful assignment %rocess and cause
T+/ seize failure
C%eck and solution:
"efer to T+/ call dro%
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@. Unreasonable %arameters
C%eck:
"8AM +"$*T$*3T
Solution:
Ad
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. +overage &blind area lonely island'
Solution:
Same as T+/ call dro%
S5++/ +ongestion
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g
Main Reasons
for SDCCH
Congestion
Unreasonable
%arameters
System ca%acity limit
Unreasonable :A+
,nterference
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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'
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Solution:
Modify MA8"ET"A#S , T-P,nteger
3arameters regarding to :ocation U%date +"$*+S/*
T26>>
,n 5ual band networ* Ad
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>. System +a%acity :imit
)oarder between :A+ "ailway
station* ,nstant :arge number of:ocation U%date
Add S5++/ or Add T"8 h
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@.,nterference
"A+/ access threshold is too low and at the same
time there is interference,
the system will regard the
interference as S5++/ re!uirement
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01/19/15
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T+/ assignment failure "ate
;CAssignment "e!uestD 7 CAssignment 4ailure F +lear
"e!uestD
TC# assignment failure rate
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i29
8bb3j]61]0 9=66/]`
9k/]]1> 8^03l/03=]
9k/]]1> 8^03l/03=]8^m
8bb3j]61]0 n/3>C@1$ 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/]`
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01/19/15
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;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
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01/19/15
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+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
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Instances for TC# assignment failure
2?@AB CDE
FG!"#
H