gsm traffic statistics analysis
TRANSCRIPT
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GSM Traffic Statistics Analysis
ZTE university
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Course Target
When you finish studying this
course, you can:Master ZTE traffic statistic
Master the meaning of parameter items of
common-used traffic statistic
Master the methods to analyze and position the
problems making use of traffic statistic
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Contents
ZTE Traffic Statistic !er!ie"
#efinitions f Main Traffic Statistic $arameters
$osition And Analyze $roblems Making %se f Traffic
StatisticTraffic Statistic Analysis Cases
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ZTE Traffic Statistic Overview--The Function Of Traffic
Statistic Analysis
Optimization
scheme
Radio NetworkOptimization
Data collection
optimization scheme
implementation
ight ad!ustment
solution and
evaluation
Traffic statistic
analysis"now network performance
inde# $rovide clients with
%uantitative service guidelines
&onitor network performance
$osition and analyze network
pro'lems
(mprove network running
%uality
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ZTE Traffic Statistic Overview--ZTE Traffic Statistic Introduce
Traffic
statistic
Alarm
statistic
Performance
index
Measurement
statistic
CS trafficbasic
measurement
BTS
measurement
Radio
measurement
A interface
measurement
Resourceseizure
measurement
PS traffic
measurement
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ZTE Traffic Statistic Overview-- Traffic Statistic Index
riginal traffic statistic
inde&
)D**+ congestion rate
)D**+ assignment
success rate
)D**+ call drop rate T*+ congestion rate
T*+ assignment
success rate
T*+ call drop rate
+andover success rate
Random access success
rate
$aging success rate
,correlative inde#-
Synthetical traffic statisticinde&
Traffic.to.drop ratio
Worst cell ratio
T*+ assignment success
rate ,*hina /nion definition- Radio connection rate
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ZTE Traffic Statistic Overview --CS Traffic Basic Measureent
CS traffic
basic
measuremen
t
'asic measurement task is the measurement "hich produces basic
performance report, including resource status、 ser!ice status、 channel
(uality etc), can reflect the total net"ork status more roundly)
Q3 module
measurement
Carry out statistic according to the modules, mainly including
assignment and hando!er* and the load of C$%) Statistic is mainly
responsed to +MM* and SMM is used to measure cpu,s burthen)
Q3 cell
BTS
measuremen
t counter
Measure 'TS po"er 、 +&le!el、 +&(uality and TA in terms of cells*
then accumulate the measurement !alues got from T+. po"er control
counter and report the statistic)
3
2
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ZTE Traffic Statistic Overview --BTS Measureent
Power
control
measuremen
t
'TS decides "hether to control MS/s0or 'TS/s1 po"er or not based on
+&le! or +&(ual in measurement report *and carries out statistic according to
different po"er control factor)
Carrier
frequency
servicemeasuremen
t
2t/s to measure "hether channel acti!ation、 assignment、 hando!er are
successful "ith carrier fre(uency as unit* and measure carrier fre(uencyinterference bands、 MA. and M23 uplink4do"nlink signal le!el)
Paging
measuremen
t
Carry out statistic paging drop and the length of (ueue "ith carrier fre(uency
as unit)
Carrier
fre(uencybasic
measuremen
t
Measure carrier fre(uency/s ser!ice occupation times and occupation time
about TC5 and S#CC5)
2
4
3
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ZTE Traffic Statistic Overview-- !adio easureent
Cell radiomeasurement
Measure interference and 6os of per channel "hich is occupying andidle state)
Radio access
measurement
Measure MS/s radio random access process* including access trying
times、 processing times 、 successful times "ith different reason)
SDCCH
measurement
Measure success times and success rate about S#CC5 assignment*
allocation7 occupation etc)* reflect ser!ice of S#CC5)
TCH/F
measurement
Measure success times and success rate about TC548 assignment*
allocation7 occupation etc) *"hich is based on configure channels and
ad9ust parameter)
2
4
3
SAPI3
measurement
Measure connection times 、 recei!e times and transmitting times of
point to point SMS)
5
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ZTE Traffic Statistic Overview-- !adio easureent
RMM
assignment
measurement
#escribe +MM assignment* including assignment attempt、 e&ecutingand (ueue "ith e!ery reason)
RMM call
drop
measurement
#escribe all kinds of channel in signaling flo"、 +MM call drop times、
call drop reason etc))
Handover
reason
measurement
Carry out statistic on e!ery hando!er0out1 attempt according to e!ery
reason)
Handover
common
measurement
Carry out statistic hando!er process "ith e!ery reason*including
attempt、 e&ecuting、 success and fail times*reflect hando!er success
rate)
6
7
9
8
Handover
synchronization
measurement
10
Carry out statistic all kinds of synchronism hando!er times)
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ZTE Traffic Statistic Overview-- !adio easureent
Neighboring
cell handover
measurement
Carry out statistic on mutual hando!er by selecting some cells and theirneighboring cells)
Paging
measurementThe meaning and measurement point of paging measurement counter)
Abisinterface
signaling
statistic
Carry out statistic on all kinds of signaling numbers transmitted in Abis
interface)
Radio
resource
usability
measurement
Measure usage of each cell radio channel resource)
11
12
14
13
HR statistic
measurement
2t/s added 5+ basic measurement according to subscriber/s need* mainly
describe resource status* ser!ice status and dynamic changeo!er status of
TC545
15
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ZTE Traffic Statistic Overview --A Interface Measureent
A interface
signaling statistic
measurement
carry out statistic on signaling numbers of 'SC production 、 for"arding
and reception based on signaling name and signaling type)
A interfaceassignment
、
call
drop、
hando
ver statistic
measurement
Carry out statistic on assignment 、 call drop and hando!er times of A
interface* carry out statistic and classify on failure status* it/s helpful to
position and sol!e problem)
SCCP
connection
measurementand ground
circuit
resource
usability
measurement
Measure SCC$ links/ establish status and usability of ground relay circuit
resource)
3
2
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ZTE Traffic Statistic Overview --!esource Occu"ation
Measureent
TRX LAPD
link
measurement
Carry out statistic on signaling alternant of each :A$# signaling link "hich
connecting T+. "hen it/s transmitting and recei!ing messages !ia :A$#
board *"ith T+. :A$# link as unit)
O&M LAPD
link measurement
Carry out statistic on signaling alternant of each 7M :A$# signaling link
"hich connecting T+. "hen it/s transmitting and recei!ing messages !ia:A$# board *"ith T+. 7M :A$# link as unit)
SCCP link
measurement
Carry out statistic on signaling alternant of each SCC$ link "ith SCC$ link
as unit)
Processorload
measurement
Carry out statistic on C$% load 、 internal memory 、 ser!ice load and
file system load of each SMM and +MM module* "ith module as unit)
2
4
3
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ZTE Traffic Statistic Overview --#S Service Measureent
PS basic
measurement
2t measures $S basic performance report* including resource status 、
ser!ice status and channel (uality etc)* can reflect comprehensi!ely total $Snet"ork performance)
NS
measurement
Carry out statistic on 'S;C links/ data transmition 、 signaling
alternant and abnormal reason etc) "ith single 3S;C as measurement entity)
BSSGP
measurement
NSE
measurement
Carry out statistic on paging 、 status indication message 、 ';C
signaling reset times etc) "ith single 3SE as measurement entity)
2
4
3
PS traffic
statistic and
resource
management
measurement
$S traffic statistic measure cell ser!ices) +esource management mainly
measure 'SC system resource usage)
5
Mainly measure messages transmitting and recei!ing in Gb interface on
'SSG$ layer of G$+S ser!ice)
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Contents
ZTE Traffic Statistic !er!ie"
#efinitions f Main Traffic Statistic $arameters
$osition And Analyze $roblems Making %se f Traffic
StatisticTraffic Statistic Analysis Cases
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#efinitions f
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#efinitions f
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#efinitions f
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#efinitions f
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#efinitions f
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#efinitions f
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#efinitions f
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#efinitions f
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#efinitions f
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#efinitions f
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#efinitions f
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#efinitions f
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#efinitions f
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#efinitions f
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#efinitions f
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#efinitions f
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Contents
ZTE Traffic Statistic !er!ie"
#efinitions f Main Traffic Statistic $arameters
$osition And Analyze $roblems Making %se f Traffic
StatisticTraffic Statistic Analysis Cases
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#osition And Analy2e #ro'les with Traffic Statistics-- Traffic
Statistic Analysis Content
Call Drop ProblemsAnalysis
SDCCH assignmentproblems analysis
TCH congestionproblems analysis
SDCCH congestionproblems analysis
Handover problemanalysis
TCH assignmentproblems analysis
Traffic )tatistic 0nalysis *ontent
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#osition And Analy2e #ro'les with Traffic Statistics
Whole $rinciple of Traffic )tatistic 0nalysis
Whole $rinciple: 1rom whole pro'lem to the particular pro'lem2 fromone.day network inde# o'servation to one.week network inde#2 from single
inde# to their correlation2 from the key cells to su'ordinate cells3
4efore Traffic )tatistic 0nalysis: *ollect overall data2 including all kinds ofperformance reports and measurement data2 and need to know such 'asic
information as networking structure3 *arry out Traffic )tatistic 0nalysis : 4ased on the principle of 5grasp the
situation macroscopically2 handle it microscopically6 and characteristics of
traffic statistic data2 traffic statistic analysis is a process from the whole
network performance measurements to the cells performance
measurements2 and a gradual process from the main inde# to
su'ordinate inde#3 (t analyzes network performance inde# first2 with a cleargrasp of the whole network inde#2 then determines which inde# are worse2
finally analyzes the main cells which cause worse inde#3
*om'ine with other network optimization tools: During traffic statisticanalyzing2 it needs to com'ine with other network optimization tools to
position and analyze pro'lems3
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#osition And Analy2e #ro'les with Traffic Statistics
TO$ 0nalyze ðod Description of TO$ 78 ðod9 /se data sort and filter functions of
E:*E or other software tools to sort each data from 'ad to good3
Thus facilitate connecting each data 2finding the rules and locating
pro'lems more easily3
*arry out studying and contrastive analysis on the su'.item;s
statistic function of 4)*.level traffic statistic report3 (f certain important inde# ,such as call drop rate、 successful
handover rate- are found a'normal in 4)*.level traffic statistic
report2 then carry out cell.level traffic statistic to analyze its more
detailed content3
*heck the cells which single inde# is a'normal and has more
a'solute times of failure ,call drop、 congestion、 handover failure2etc- 3
*om'ine the two parameters2 percentage and a'solute times of
failure ,call drop、 congestion、 handover failure2 etc-2 to decidewhether it needs to adopt further measures3
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话统分析总体思路
#osition And Analy2e #ro'les with Traffic Statistics--Traffic
Statistic Analysis 3eneral Idea
CELL Level
Report
High Call
Drop Rate
High Congestion
Rate
High Handover
Failure Rate
Alarm InformationCS Basic Service
Measurement
Carrier Frequency
Service Measurement
Cell Radio
Measurement
CS Basic Service
Measurement Alarm Information
Radio Access
Measurement
Cell Radio
Measurement
Alarm InformationHandover Reason
Measurement
Handover Common
Measurement
Adjacent Cell Handover
Measurement
CS Basic Service
Measurement
BSC Level
Report
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#osition And Analy2e #ro'les with Traffic Statistics--Traffic
Statistic Analysis 3eneral Idea
The other optimization methods DT: )imulate )u'scri'er make calls in moving
state2 0nalyze coverage、 %uality、 handover 、signaling3
*
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#osition And Analy2e #ro'les with Traffic Statistics--Index Analysis Filter
Method
E%uipment
hardware pro'lems
(nterferencepro'lems
*overage
pro'lems
Commonness $roblems
+andover
pro'lems
Other radioparameters pro'lems
。。。
2ndi!iduality $roblems
1irst *ommonness
)econd (ndividuality
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$osition And Analyze $roblems "ith Traffic
Statistics
Commonness factors lead to bad
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#osition And Analy2e #ro'les with Traffic Statistics 4
Coon #ro'les
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#osition And Analy2e #ro'les with Traffic Statistics--
Coon #ro'les 2nterference
Traffic Statistic AnalysisTraffic Statistic Analysis Method of $osition and +esol!eMethod of $osition and +esol!e
8re(uency check: Analyze inner
interference "ithin same or ad9acent
fre(uency point;
S"eep fre(uency test: search e&ternalinterference;
#T: Check interference and signal (uality
status of the problem section D
Ad9ust 'TS/s transmit po"er of correlati!e
cells、 antenna do"ntilt or fre(uency
point etc) to a!oid interferenceD
Enable function of 5$, #T., #$C etc) D
+esol!e e(uipment problems 0such as
T+. board self-e&citation、 antenna
intermodulation1)
CE:: traffic statistic: Analyze interference
bands le!el
CS basic measurement: Analyze discipline of
interference bands appears: change "ith time
and traffic capacity
'TS measurement: $osition T+. le!el
interference bands;
5ando!er reason measurement: The ratio of
%:4#: +6 hando!er to all hando!er ;
Cell radio measurement: Analyze le!el and
(uality status of cells)
Abis interfaces signaling trace: Analyze cells
and T+.s "ith interference)
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#osition And Analy2e #ro'les with Traffic Statistics--
Coon #ro'les Co!erage $roblems
DT in weak coverage area=
0d!ust network parameters according to
DT result=
4T) transmitting power2 antennadowntilt and height2
R#lev>0**E))>&(N>&)2 the neigh'or
relation2 R:E?>0**E))>&(N of
handover candidate cell3
0d!ust coverage2 avoid over.
coverage、 owe.coverage and aloneisland phenomenon=
0dd 4T)3
*ell traffic statistic9 Worse /@D
R< and "$(=
$ower control performance
measurement9 average of /@Dsignal level is too low=
*ell radio measurement9 Times of
low R:.evel have higher
percentage=
+andover reason measurement9
Times of rescue /@D R#.lev
handover has higher percentage=
ðod of $osition and Resolveðod of $osition and ResolveTraffic )tatistic 0nalysisTraffic )tatistic 0nalysis
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#osition And Analy2e #ro'les with Traffic Statistics--Call
%ro" Analysis
Call #rop Type
Radio ink 1ailure call drop
+andover 1ailure call drop
0$D call drop
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#osition And Analy2e #ro'les with Traffic Statistics--Call
%ro" Analysis
Analysis Frae
BSC +evel
"erforance re"ort
CE++ level
"erforance re"ort
BTS easureent
Cell radioeasureent
CE++ +evel
"erforance re"ort
CS 'asic
easureent
Alar statistic
Coon "ro'les
analysis
Individuality
"ro'les analysis
Alar analysis
Traffic statistic
analysis
Si)nalin) analysis
Other o"tii2ation
ethods
Fro whole to
"articular
Carrier fre5uency
level
Easy to "osition
and analy2e
First coonness
then individuality
Execute and solve
"ro'les
/ , 6 7
Solve Call
dro" "ro'les
Confir hi)her
call dro" cell
Analy2e call dro"
factors
Confir
call dro" ty"e
Confir T!8 level
call dro"
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#osition And Analy2e #ro'les with Traffic Statistics--Call
%ro" Analysis 2mproper setting of hando!er parameters
Traffic Statistic AnalysisTraffic Statistic Analysis +esol!e Methods+esol!e Methods
Add neighbor relation in reasonD
Ad9ust hando!er parameters)
Check hando!er parameters* find
unreasonable parameters settingD
5ando!er common measurement* check
hando!er out failure statusD
5ando!er common measurement* check
hando!er reason and percents of each kind
of hando!erD
Ad9acent cell hando!er statistic
measurement lo" success rate of
hando!er out ( aim at certain cell), findtarget cell "ith lo" hando!er success rate
and looking for causeDCS basic ser!ice measurement hando!er
times4call times > )
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#osition And Analy2e #ro'les with Traffic Statistics--Call
%ro" Analysis %:4#: 2mbalance 0Tower top amplifier 、 +$0、 0ntenna azimuth1
Check to"er top
amplifier 、 C#%、 +#%、 'TS boardsand +8 feederD
Check antenna feeder) Check antenna
azimuth and do"ntilt "hether according
"ith design criterionD check antenna
feeder* 9umper feeder is connected rightly
and connecters are connected tightly*
feeder is undamaged* make sure standing
"a!e rate under normal range)
CS basic ser!ice measurement Analyze
%:4#: A!erage+&:e!D
Abis interface signaling trace Analyze
%:4#: +&:e!D
Cell radio measurement Analyze %:4#:+&:e! distributing)
+esol!e Methods+esol!e MethodsTraffic Statistic AnalysisTraffic Statistic Analysis
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切换问题分析
#osition And Analy2e #ro'les with Traffic Statistics4
&andover #ro'les Analysis 5ando!er Analysis 2dea
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MSC?
'SC? 'SCF 'SC
MSCF
1 $
#osition And Analy2e #ro'les with Traffic Statistics4
&andover #ro'les Analysis General Analysis 2dea
*ells with handover pro'lems9 0ll cells or individual
cell3
+andover direction of pro'lem cells 9 +andover out
cell failure or in cell handover failure=
O'!ect of handover failure9 4etween service celland multi.cell or individual cell3
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#osition And Analy2e #ro'les with Traffic Statistics4
&andover #ro'les Analysis $ossible 8actors influencing 5ando!er
Success +ate*ommon $ro'lems
already analyzed
/@D (m'alance
E%uipment
$ro'lem
+andover
$arameters
(rrationality
*overage
(nterference
:ead :o" 5ando!er
Success +ate
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2mproper setting of hando!er parameters
#osition And Analy2e #ro'les with Traffic Statistics4
&andover #ro'les Analysis
Check $'GT、 rescue hando!er etc)hando!er le!el threshold* setting of
hando!er function s"itch "hether correct)
+esult of hando!er times !s TC5 calloccupation success times is disproportion)
2f hando!er4call> , $ing-pong hando!ere&ist in all probability* should check
hando!er parameters setting and ad9ust
0least time space of inter-cell* $'GT
5o:e!Ths etc)1
Cell performance report :o" hando!er
success rate* more hando!er failure timesD
'TS measurement filter T+.s "ith more
hando!er failure times)
'asic measurement analyze e!ery
hando!er factors percent* $'GT hando!er
percent too high or too lo"D
5ando!er statistic hando!er find out t"o
cells lead to hando!er failure)
+esol!e Methods+esol!e MethodsTraffic Statistic AnalysisTraffic Statistic Analysis
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Comprehensi!e analysis
#osition And Analy2e #ro'les with Traffic Statistics4
&andover #ro'les Analysis
E&tend capacity of target cell or traffic
proportionD
Check hard"areD
Ad9ust hando!er parametersD
ptimize ad9acent cellsD
$erformance report of cells le!el target
cell congestionD
CS basic measurement lo" hando!er in
success rate* maybe hando!er in cell
hard"are problems or has interference
etc)D :o" hando!er success rate maybe target
cell congestion or hando!er parameters
setting is irrationalityD
Check neighbor relation "hether ha!e
omitted neighbor*single or redundant
neighborD
Check e&terior cell setting of e&terior cellparameters error)
+esol!e Methods+esol!e MethodsTraffic Statistic AnalysisTraffic Statistic Analysis
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#osition And Analy2e #ro'les with Traffic Statistics4
&andover #ro'les Analysis
ther
0fter eliminate commonness pro'lems2 optimize parameters of
ad!acent cells2 analyze and resolve /@D 'alance pro'lems of ad!acent
cells2
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$ossible causes of TC5 blocking
#osition And Analy2e #ro'les with Traffic Statistics-- Analysis
Of TC& Bloc(in)
)hortage of system
capacity or traffic
im'alance
Data configuration
pro'lem
(nterference
*overage pro'lem
0ntenna and feeder
system pro'lem
$arameters setting
pro'lem
TCH Blocking
*ommon $ro'lems
already analyzed
i i A A i ffi S i i
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:ack of system capacity or unbalanced traffic
#osition And Analy2e #ro'les with Traffic Statistics--
Analysis Of TC& Bloc(in)
E#tend capacity2 or ad!ust configuration
of 'usy and idle carrier cells=
0d!ust coverage ,ad!ust transmit power
of 4T)2 antenna azimuth2 downtilt2height etc3-=
0d!ust main parameters ,*RO2
R#lev>access>&in>&)2 ena'le traffic+o
function-=
0d!ust priority level and handover
parameters of cells3
Too high traffic capacity in T*+ ,Traffic
per channelA83B-; Too much overflow times2 system 'usy
for a long time= Traffic im'alance ,three cells of one
4T) traffic im'alance2 or several 4T)
traffic im'alance=
0nalyze out serious congestion from
performance reports3
Cudging ðodCudging ðod )olution)olution
# i i A d A l # 'l i h T ffi S i i
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Antenna and feeder problem
#osition And Analy2e #ro'les with Traffic Statistics--
Analysis Of TC& Bloc(in)
*heck antenna azimuth2 downtilt2
connection of antenna and feeder
system3
1re%uency point scanning9 results to
same fre%uency point through main
and secondary diversity antenna
measuring=
*ell radio measurement9 signal level2
%uality distur'ing=
)ignaling tracing9 measurement report
analysis3
udging Methodudging Method SolutionSolution
# iti A d A l # 'l ith T ffi St ti ti
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2mproper setting of parameters
#osition And Analy2e #ro'les with Traffic Statistics--
Analysis Of TC& Bloc(in)
0d!ust irrationality parameters setting=
)olve pro'lems3
$erformance statistics report9 !udging
T*+ congestion=
0larm information statistic: 4T) or
TR: pro'lem= 4T) measurement9 check TR:s=
*heck parameters9
R#ev>0ccess>&in>&)2 cell reselect
parameters3
udging Methodudging Method SolutionSolution
# iti A d A l # 'l ith T ffi St ti ti A l i
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Causes of S#CC5 blocking
#osition And Analy2e #ro'les with Traffic Statistics-- Analysis
Of S%CC& Bloc(in)
引起 S%CC&
拥塞率高的
!"#$
%:
$arameters pro'lem
*apacity
SDCCH Congestion
(nterference
0* $artition
*ommon $ro'lems
already analyzed
# iti A d A l # 'l ith T ffi St ti ti
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2mproper setting of parameters
#osition And Analy2e #ro'les with Traffic Statistics--
Analysis Of S%CC& Bloc(in)
0d!ust parameters ,random access
error level threshold2 R0*+ access
level threshold-2 &a#imum
retransmission times2 E#tend
Transmission distri'uted timeslots -=
0d!ust location update parameters=
0d!ust parameters of the dual.'and
network3
4asic measurement9 !udging reasons
for )D**+ congestion; Radio access measurement9
immediate assignment successtimes@immediate assignment
timesA&; $arameters checking9 parameters of
correlative with radio access=
ow usa'ility rate )D**+3
udging Methodudging Method SolutionSolution
# iti A d A l # 'l ith T ffi St ti ti
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2nsufficient system capacity
#osition And Analy2e #ro'les with Traffic Statistics--
Analysis Of S%CC& Bloc(in)
E#tend network capacity=
0dd )D**+=
0d!ust TF7GG、 TFG7G、 R0*+
parameters etc3 ; 0d!ust other parameters3
$erformance report9 T*+ and )D**+
'oth congested=
$erformance report9 T*+ don;t
congest 'ut )D**+ is congestedseriously=
$arameters ad!usting9 traffic hinge2
such as aviation hinge2 railway station
etc32 has lots of location updates=
)&) leap3
udging Methodudging Method SolutionSolution
# iti A d A l # 'l ith T ffi St ti ti
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2mproper :AC di!ision
#osition And Analy2e #ro'les with Traffic Statistics--
Analysis Of S%CC& Bloc(in)
0d!ust *R+; 0d!ust cell reselect parameters; 0d!ust TFG7G;
0d!ust other parameters3
$erformance report9 )D**+
congested 'adly=
4asic measurement9 percent of
location update too high= 0* partition9 'usiness area2 0*
areas are crossed 'adly=
udging Methodudging Method SolutionSolution
# iti A d A l # 'l ith T ffi St ti ti
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E&istence of interference
#osition And Analy2e #ro'les with Traffic Statistics--
Analysis Of S%CC& Bloc(in)
*heck and ad!ust fre%uency point=
)olve interferences=
0d!ust access parameters3
R0*+ level threshold is lower2 at the
same time has interference2 system
mistake for having lots of )D**+
occupation re%uests3
$erformance report9 )D**+
congested 'adly=
4asic measurement9 more useless
)D**+ access =
udging Methodudging Method SolutionSolution
TC5#osition And Analy2e #ro'les with Traffic Statistics
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TC5指配问题分析#osition And Analy2e #ro'les with Traffic Statistics4 Analysis of TC& Assi)nent #ro'les TC5 Channel Analysis $rocess
Channel Occu"ation
After the syste
receives C&A99E+
!E:1I!E coand; it
will in5uire channel
resources in M#
data'ase<
TC& Channel
Allocation
BSC sends Channel
Activation FO! TC&coand to BTS, that isTC& channel allocation
atte"t< BSC receives BTS=s
feed'ac( essa)e Channel
Activation AC$; then
allocation has 'een done<
TC& Channel
Assi)nent
It is carried out
'etween BSC and MS< BTS
>ust transits coands
trans"arently< Then it is a
channel assi)nent atte"t<?hen BSC receives BTS=s
feed'ac( essa)e Esta'lish
Indication; it is considered
assi)nent is successful<
/
,
#osition And Analy2e #ro'les with Traffic Statistics
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#osition And Analy2e #ro'les with Traffic Statistics4
Analysis of TC& Assi)nent #ro'les Causes of TC5 Assignment 8ailure
+ardware pro'lems: TR:、 *D/、 loose panel ca'les;
(nterference: co.channel@ ad!acent.channel interference@ e#ternal interference=
0ntenna pro'lems9 damaged antenna feeder2 uni.polarized antenna azimuth2
inconsistence 'etween down.tilt and antenna type2 high ?)WR2 crossed or
misconnected antenna feeders=
/nreasona'le parameter configuration: improper setting of +1 parameters2 TF78H
value is set too small2 inconsistence 'etween data configured at O&*R and the data
planned2 etc3=
*overage pro'lem: weak signal or uplink Idownlink im'alance =
Repeater pro'lem9 uplink@downlink interference or im'alance of uplink@downlink=
Other reasons: soft I hardware versions of the system、 signaling cooperation
'etween 4)* and &)*=
#osition And Analy2e #ro'les with Traffic Statistics
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Analysis of traffic statistics
#osition And Analy2e #ro'les with Traffic Statistics4
Analysis of TC& Assi)nent #ro'les
udging Methodudging Method SolutionSolution
Check "hether radio parameters of the
cell is reasonableD
Check 'E+、 idle interference band le!el
inde&* decrease radio interferenceD
Check hard"are of the cellsD
Check transmission problemsD
#T analysisD
Check 'SC and base station !ersions to
a!oid unmatched !ersions leading to TC5assignment failure)
$erformance report: find out cells "ith
TC5 assignment failureD
'asic measurements: 9udge
interference band、 calldrop、 hando!er 、 uplink7 do"nlink
+6 !alueD
Alarm statistics: hard"are problems
'TS measurements: position TC5
assignment failure of carrier fre(uency
le!el 3MS: 9udge "hether carrier fre(uency
occupation is normal by occupation time
of TC5 and S#CC5D
$arameter configuration:
unreasonable dynamic S#CC5
parameter configuration)
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C f C ll %
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Cases of Call %ro" $henomenon #escription
On 7B2 &arch2 from O&*R 40& statistic2 (78 of )tation F of 4)* 8 in $0"TE network had
much more call drop rate suddenly2 with its rate more than HJ3 *all drop times increased a lot3
$roblem Analysis Through carrying out statistic on detailed performance data2 checking call drop types2 we found
radio link failure accounted for great part of call drop=
Through carrying out statistic on the interference 'and of the cell2 we found F.level or a'ove
interference 'and accounted for higher percentage=
We dou'ted first that the station had interference3 0fter checking fre%uency planning2 we found
there was no neigh'oring interference with ad!oining cells3 Through 4T) measurements2 we
found the second and third carrier fre%uency of the station had a higher failure rate
1rom alarm statistics2 this station had no hardware alarms2 no ad!acent cells missed in
configuration2 handover parameters are reasona'le3 +owever2 it;s found that the &0(Os of the
second and third TR:s are the same3
C f C ll %
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Region *ell Name 4)* (D *E (D D0TET*+ in call drop
rate,J-Remark
NORT+ (78G 8 88GG
G88B.F.7B 37H
'eforeAd9ustment
G88B.F.7H H3HK
G88B.F.7 H3F
G88B.F.7L H3LH
G88B.F.F7 738F
After
Ad9ustment
G88B.K.7 83LK
G88B.K.G 83
G88B.K.F 83HB
Cases of Call %ro"
Solution
0fter ad!usting &0(O of the third carrier fre%uency from to 782 the interference
disappeared2 call drop times decreased greatly and call drop rate restored to
normal3
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C f TC& & d # 'l
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Cases of TC& &andover #ro'les
$roblem Analysis
Checked parameters of 'AM in
the station* and the
configuration is okD
Then checked station hard"are
and it is normalD
+esetting the station can not
sol!e the problem)
reconfigure the base station
data can not either)
8ront and back platform Z#'
files are consistent
Solution
After resetting M$* hando!er
restored to normal)
4)*No3
)(TENo3
*E
No2
0d!oining*ell *(
77787,successful
handover
outattempts to
thead!oining
cell-
7778G,successful
handover
outattempts
to thead!oining
cell-
7 FG 7 8GG HH 8
7 FG 7Other
ad!acent*ell
F K
7 FG G 8G7 788 8
7 FG GOther
ad!acent
*ell
BF L
7 FG F 8G7 H 8
7 FG FOther
ad!acent*ell
FF GL
C f TC& Bl (i
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Cases of TC& Bloc(in)
$henomenon #escription On G72 Decem'er2 we carried out statistic from 40&2 and found T*+ traffic of the
third sector of No3 78B station in 4)* under i'yan network is very congested
suddenly3 T*+ congestion rate( e#clude handover ) arrived at higher than F8J3
$roblem Analysis 4efore2 this sector wasn;t congested2 'ut this time was in sudden T*+ traffic
congestion3 0fter implementing statistic on the performance report and alarm
statistic of the surrounding cells2 we found the reason for congestion was that
No37GH station corresponding with this cell had 'roken2 thus the neigh'oring traffic
had 'een a'sor'ed 'y the third sector of No2 78B station3
Solution
0fter coordinating with the office2 commission the No37GH station in time3 Then T*+
traffic congestion of the third sector of N83 7GH had 'een cleared3
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C f S%CC& Bl (i
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Cases of S%CC& Bloc(in)
$henomenon #escription (n )eptem'er2 after No3B7 new station had 'een commissioned2 )D**+ channel of the third
cell congested suddenly and its congestion rate was as high as FJ3
$roblem Analysis Through analyzing the 'asic measurement of the cell2 we found the reason for )D**+
congestion in the third cell was that there e#isted a great amount of positions to 'e updated3
0fter checking plan data and 0* division2 we didn;t find unreasona'le points3 Thus we
analyzed that this new station had certain mistaken data during commissioning3
Solution
0fter checking2 we found 0* No3 of the third cell in the station is 7L2 while 0* No3 of other
two cells of the station is 7LL3 (t is confirmed that during commissioning the new station2 0*
No3 of the third cell was input 7L mistakenly3 (t should 'e 7LL3 Thus caused a great amount
of positions to 'e updated3 Through read!ustment2 )D**+ congestion rate restored to normal3
Cases of TC& Assi)nent
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Cases of TC& Assi)nent
$henomenon #escription (n the third cell of No37 station of $+O2 its call drop rate arrives at B3LJ
2successful handover in rate is only B3FJ2 while handover out rate is L73F7J3
$roblem Analysis
TC5 assignment rate is morn than ?@* from "hich "e e&cluded the interference
problem and make sure that the cell has hard"are problems) After analyzing 'TS
measurements of the cell* "e found that TC5 assignment failure rate of the second
carrier fre(uency in the cell is !ery high* arri!ing at @) And during on-site testing*
"e found that after occupying this carrier fre(uency* the signal le!el is F@d' less
than 'CC5 carrier fre(uency le!el)
Solution
0fter changing carrier fre%uency2 each parameter restores to normal3
Cases of TC& Assi)nent
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4)* .)(TE(D.4T)
*ell and ocation 0rea
*ell,0*.*(-
T*+ in call droprate,includehandover-
,J-
T*+ droppedcall totalnum'er
T*+ assignfailurerate,J-
+andover insuccessrate,J-
+andover outsuccessrate,J-
4sc8.)ite7.4tsF
0*788F.*(888F B3L L 7G3G B3F L73F7
After Ad9ustment
4sc8.)ite7.4tsF
0*788F.*(888F 83L G3G LG3F LG3L
Cases of TC& Assi)nent
A Contrast 'efore 7After ptimization
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