15 OWJ200204 WCDMA Call Drop Problem Analysis
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Transcript of 15 OWJ200204 WCDMA Call Drop Problem Analysis
8/19/2019 15 OWJ200204 WCDMA Call Drop Problem Analysis
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HUAWEI TECHNOLOGIES CO., LTD. All rights reserved
www.huawei.c!
Internal
Call Drop Problem
Analysis
ISSUE 1.0
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Call drop analysis is very useful for network
optimiation and trouble!s"ootin#.
$ollowin# dis%ussion will #ive t"e #eneral
ideas on t"is spe%ial topi%.
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Upon %ompletion of t"is %ourse& you will be able to'
Des%ribe t"e %ate#ories for %all drop %auses
Des%ribe t"e flow of #eneral %all drop
analysis
Analye %ommon %all drop %ases
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Chapter 1 Principle of Call DropCha
pter 1 Principle of Call Drop
Chapter 2 Analysis of Call DropChapter 2 Analysis of Call Drop
Chapter 3 Call Drop CasesChapter 3 Call Drop Cases
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Chapter 1 Principle of Call DropCha
pter 1 Principle of Call Drop
Section 1Section 1 Signaling Plane Call DropSi
gnaling Plane Call Drop
Section 2 User Plane Call DropSection 2 User Plane Call
Drop
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Prin%iple of Call Drop
("ere are two types of %all drop' si#nalin# plane %all drop and
user plane %all drop'
Si#nalin# plane %all drop means )*C will send t"e messa#e
+IU )E,EASE )E-UES( to C* after C* re%eives t"e +IU
%onne%tion setup %omplete
User plane %all drop means )*C will send t"e messa#e )A/
release reuest +to C* after C* re%eives t"e +)A/ setup
%omplete
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$ormula of Si#nalin# Plane Call Drop )ate
("e formula of Call Drop )ate of CS Si#nalin# Plane'
Call Drop )ate of CS Si#nalin# Plane )*C!ori#inated CS
Domain Iu Conne%tion )elease 2 )*C!ori#inated CS Domain Iu
Conne%tion Setup Su%%ess3 1004
("e formula of Call Drop )ate of PS Si#nalin# Plane'
Call Drop )ate of PS Si#nalin# Plane )*C!ori#inated PS
Domain Iu Conne%tion )elease 2 )*C!ori#inated PS Domain Iu
Conne%tion Setup Su%%ess3 1004
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5easurement Points of Si#nalin# Plane Call Drop
5easurement points of Si#nalin# plane %all drop
Call Drop )ate of Si#nalin# Plane is %al%ulated by %ountin# )*C!
ori#inated Iu %onne%tion release
A
IU )E,EASE C655A*D
IU )E,EASE C65P,E(E
)*C C*
IU )E,EASE )E-UES(
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Causes of Si#nalin# Plane Call Drop
Usually& t"e typi%al %auses for sendin# t"e IU7release messa#e
are as follows'
65 intervention
User ina%tivity )epeated inte#rity %"e%kin# failure
UE #enerated si#nalin# %onne%tion release
), out!of!syn%"roniation
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Chapter 1 Principle of Call DropChapter 1 Principle of Call Drop
Section 1 Signaling Plane Call DropSection 1 Signaling Plane Call Drop
Section 2 User Plane Call DropSection 2 User Plane Call Drop
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$ormula of User Plane Call Drop )ate
("e formula of Call Drop )ate of CS User Plane'
Call Drop )ate of CS User Plane )*C!ori#inated CS
Domain )A/ )elease 2 )*C!ori#inated CS Domain )A/
Setup Su%%ess 3 1004
("e formula of Call Drop )ate of PS User Plane'
Call Drop )ate of PS User Plane )*C!ori#inated PS
Domain )A/ )elease 2 )*C!ori#inated PS Domain )A/
Setup Su%%ess 3 1004
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5easurement Points of User Plane Call Drop
5easurement points of User plane %all drop
Call Drop )ate of User Plane is %al%ulated by %ountin#
)*C!ori#inated )A/ %onne%tion release
A
)*C C*
)A/ )E,EASE )E-UES(
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Cause of User Plane Call Drop
Usually& t"e typi%al %auses for sendin# t"e )A/ )elease
messa#e are as follows'
65 intervention
U()A* #enerated reason
)A/ preempted
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Chapter 1 Principle of Call DropChapter 1 Principle of Call Drop
Chapter 2 Analysis of Call DropChapter 2 Analysis of Call Drop
Chapter 3 Call Drop CasesChapter 3 Call Drop Cases
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Chapter 2Chapter 2 The Analysis of call dropThe Analysis of call drop
Section 1 Main causes of high call drop rateSection 1 Main causes of high call drop rate
Section 2 Analysis flow of call dropSection 2 Analysis flow of call drop
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Analysis of Call Drop
A%%ordin# to t"e definition of %all drop measurement points& %all
drop is usually %aused by t"e followin# reasons'
Euipment problem.
)$ problem.
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Euipment Problem
Call drop arisin# from euipment problem
8ardware problem
(ransmission problem
Antenna and feeder fault
6t"er %auses
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)adio ,ink $ailure
Signaling process chart of radioSignaling process chart of radiolink failurelink failure
UE ode! "C C
5easurement )eport
5easurement )esult
), $ailure I*DICA(I6*
IU )E,EASE )E-UES( 9), $ailure:
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Analysis of Causes of )adio ,ink $ailure
Analye t"e %auses of t"e failure of radio links. ("e %auses%an be'
Interferen%e
; Internal interferen%e& e<ternal interferen%e and t"e
euipment interferen%e Poor %overa#e
; Covera#e "ole& dead one& isolated island&uplink2downlink unbalan%e
Improper parameter settin#
; radio link timeout %ounter& "andover& power %ontrolet%.
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)adio ,ink $ault ! Covera#e
Covera#e'
Covera#e overs"ootin#
Covera#e "ole
Si#nal attenuation
In%omplete definition of ad=a%ent %ells
unbalan%e of uplink2downlink
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8andover Problem
Delayed "andover
1:("e soft "andover t"res"old is too "i#" or t"e time!to!tri##er
settin# is too bi#.
?: ("e soft "andover area is too small.
Pin# Pon# 8andover
In t"e "andover area& be%ause of t"e si#nal flu%tuation& t"e UE
will probably repeat "andovers between t"e sour%e %ell and t"e
tar#et %ell.
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Chapter 2Chapter 2 The Analysis of call dropThe Analysis of call drop
Section 1 Main causes of high call drop rateSection 1 Main causes of high call drop rate
Section 2 Analysis flow of call dropSection 2 Analysis flow of call drop
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Call Drop ,o%ation Analysis
Call drop lo%ation analysis' based on t"e lo%ation of
t"e %all drop event in t"e map window in t"e post
pro%essin# tool& followin# information %an be
obtained'
("e pla%e of t"e drop %all
At t"e ed#e of t"e @ %overa#e or not
)elated %ells
Distan%e between related @ %ells and t"e drop
%all point
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*ei#"bor ,ist Analysis
*ei#"bor list analysis' to find out any %ell not defined in t"e
nei#"bor list& followin# information need to be obtained'
/est servin# %ell before t"e %all dropped
/est servin# %ell after t"e %all dropped
E<istin# nei#"bor list of t"e best servin# @ %ell
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Covera#e Analysis
Covera#e analysis' Analye t"e pilot %overa#e to #et
information about'
CPIC8 transmission power
B"et"er followin# %overa#e events take pla%e or not'
; Covera#e limited
; System interferen%e
; Poor uplink %overa#e
; Poor downlink %overa#e; Pilot pollution
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Covera#e Analysis
Covera#e analysis' Analye t"e pilot %overa#e to #et
information about'
CPIC8 transmission power
B"et"er followin# %overa#e events take pla%e or not'
; Covera#e limited
; System interferen%e
; Poor uplink %overa#e
; Poor downlink %overa#e; Pilot pollution
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Covera#e Analysis
Covera#e analysis' Analye t"e servi%e %overa#e to #et
information about'
Servi%e related 5a<imum downlink transmission power
SI) before t"e %all dropped
5a< uplink transmission power allowed for UE
A%tual uplink transmission power before t"e %all dropped
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8andover Analysis
8andover analysis to #et information about'
Si#nal stren#t" %"an#e of t"e tar#et %ell and t"e
servin# %ell
$ollowin# %ause e<ist or not'
; insuffi%ient "andover area
; too late to start C5
; too late to add tar#et %ell
; too early to delete servin# %ell
; intera%tion problem amon# type of "andover
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Chapter 1 Principle of Call DropChapter 1 Principle of Call Drop
Chapter 2 Analysis of Call DropChapter 2 Analysis of Call Drop
Chapter 3 Call Drop CasesChapter 3 Call Drop Cases
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Case 1 $ault des%ription' ("e position of t"e drop %all was not in t"e
ed#e of t"e @ %overa#e. ("e %all dropped on %ell SC?0.
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Case 1
Analysis'
1.Poor %overa#e 'from t"e pa#e s"own &we %an find t"at
; before t"e drop& t"e best server for t"e UE is not t"e
same as t"at of t"e s%anner.
; t"e CPIC8 E%2Io 9and CPIC8 )SCP: de#rades for UE
6*, w"ile s%anner s"ows no de#radation.
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Case 1
(rouble!s"ootin# dis%ussion
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Case ?
$ault des%ription' ("e position of t"e drop %all was in t"e ed#e of t"e@ %overa#e& t"e %all dropped on %ell SC1G& t"e distan%e between
%ell SC1G was very far away from t"e drop %all point.
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Case ? Analysis
1. analye t"e a%tive set and monitor set information
before %all drop from UE measurement results
only s%1G in t"e a%tive set&
no %ell in t"e monitor set.
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Case ? Analysis
?. Analye t"e s%anner data in %on=un%tion wit" t"e UE data
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Case ?
(roubles"ootin# dis%ussion
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Case ?
Con%lusion to analye t"e %overa#e problem'
Analye t"e pilot %overa#e in %on=un%tion wit" t"e
servi%e %overa#e
Analye t"e uplink %overa#e in %on=un%tion wit" t"e
downlink %overa#e
Analye t"e s%anner data in %on=un%tion wit" t"e UE
data
Analye t"e CPIC8 )SCP in %on=un%tion wit" CPIC8
E%2Io& SC
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Case
$ault des%ription' ("e drop %all o%%urred in t"e area offreuent %"an#e of best server s"own by t"e s%anner
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Case Analysis
1.Compare E%2Io from bot" s%anner and UE at t"e time of
t"e drop' t"e UE E%2Io drop to H !1F d/ w"ile t"e s%anner
remained above ! d/ '
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Case
Analysis
. a%%ordin# t"e latest measurement %ontrol
messa#e& we %an find SCJ0 is in t"e list. ("e
drop %all is not t"e %ase of missin# nei#"bor.
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Case Analysis
G. It seems t"at t"e best %ell %"an#es from SCJ0 to SCJ0J
too fast for t"e UE to perform soft "andover on time.
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Case
Analysis
As t"e "andover t"res"old of 1a event is G.Jd/& t"e
delay is 0d/& t"e delay tri##er time is ?0ms& t"e filter
%oeffi%ient is 91 se%ond is reuired:& so t"e
reuirement for t"e "andover area is' t"e lastin# time
w"en 9E%2Io of J0 %ell K E%2Io of J0J %ell: H G.Jd/ is
about ? se%onds . ("e value in t"e %ir%le as s"own in
t"e dia#ram %annot meet t"e reuirement.
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Case Analysis
Uu7Interfa%e messa#es t"at 1a event of SCJ0J was tri##ered at JG'0G'
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Case
Analysis
/ut SCJ0 went bad too severe for t"e pro%edure of +A%tive
Set Update to be finis"ed'
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Case
(roubles"ootin# dis%ussion
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Case
$or analyin# t"e "andover problem& t"e followin#
information s"ould be obtained'
t"e si#nal stren#t" %"an#e of t"e tar#et %all and t"e
servin# %ell
w"et"er followin# %ause e<ist or not' insuffi%ient
"andover area& too late to start C5& too late to add
tar#et %ell& too early to delete servin# %ell& intera%tion
problem amon# type of "andover
w"et"er pin#!pan# "andover e<ist or not
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Case G
Analysis
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Case G Analysis
$urt"er investi#ation s"ows t"at UE reports event 1a of SC1、
SC1 before drop'
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Case G Analysis
In t"e pro%ess of addin# SC1 and SC1 to a%tive set& it is failed be%ause
of t"e wron# data %onfi#uration of nei#"bor )*C. ("e %ell ID are not
known by nei#"bor )*C.
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Case G
(roubles"ootin# dis%ussion
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