06.April 2006
Introduction to UMTS
Radio KPI
3G network planning introduce
www.huawei
www.huawei.com
.com
Huawei Northwest Africa Region
RNP Solution Manage: William.chen
William.chen@huawei.com
HUAWEI TECHNOLOGIES CO., LTD.
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Agenda
n
UMTS Radio KPI overview
n
3G Network Optimization
n
Case Study of KPI Optimization
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3G KPIs Principle: S.M.A.R.T
Specific
Measurable
Attainable
Relevant
Time-bound
the KPI has clear and complete definition and
formula, include check point and procedure.
KPIs are measurable by given condition,
measurement equipment and procedure.
all the KPIs should be reachable, it is refer to the
commercial network.
the KPI can show the subscriber experience
the KPI target should be on the base of time-bound
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3G KPIs : Specific
Complete KPI definition include the formula combine with the check point or
procedure.
The example: RRC Connection Successful Rate
n formula
RRCS_SRService =
RRCConnectionSuccessservice
×100%
RRCConnectionAttempt service
n Check point
The number of “RRC Connection Attempt” is A1 or
A2?
A2 represent the effective number of “RRC
Connection Attempt”.
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3G KPIs : Measurable – Drive Test
n Field Test -> Drive Test
Evaluate the overall network
performance, usually on the network
pre-launch phase and initial stage of
commercial launch.
Test platform
Multiple test model
UEs can perform
different tests.
Data analysis
Probe & Assistant is used
for analyzing test data
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Driver test route is based on
cluster, it is involved about 20
sites in one cluster usually.
3G KPIs : Measurable – Stationary test
System KPI is suggested to be
test by stationary:
n Field Test ->stationary Test
Evaluate the system / equipment performance.
n Throughput KPI
n Delay KPI
n Quality KPI
Core Network
Stationary test condition is fixed,
and usually used in indoor test
scenario.
NodeB
RNC
NodeB
System performance
nEquipment ability
nTransmission
nNetwork construct
n….
Radio Network
performance
nRadio network
planning
nSpecial environment
condition
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Radio Network KPI test is
suggested to be test by drive test
n Call drop rate
n Handover successful rate
3G KPIs : Measurable – Statistic test
n Statistic Test
Nastar
server
Monitoring & analysis
center
Recommended for security
Essential
Optimization team
OM system
Pre-Condition for Statistic Test
Subscriber care center
Local networks
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There
must be enough statistic sample, that
Terminal: ordinary PC or laptop, no distance
mean
network traffic should be reach high
limitation
level.
Any corresponding dept.
Page 7
Huawei KPI test platform
comprehensive analysis of the
performance, configuration,
alarm
GENEX Nastar 3G
iManagerTM M2000
obtaining test data
op para
tim
me
iza
tion ter
fil
au
es
to
de matic
l
ive
sharing of
ry
Node B
analysis results
RNC
v GENEX Probe
GENEX Assistant
3G
v AGILENT
Node B
v QUALCOMM
v HUAWEI RNC
HLR/AC
multiple test data
Node B
RNS
wireless test data
GENEX Probe
WCDMA
R NC
te
d a ta s t
MSC/SSP/
VLR
Node B
RNC
GMSC/SSP
CN
GENEX UNet
Node B
Node B
network pre-planning/planning
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RNS
PSTN
PLMN
ISDN
3G KPIs: Relevant
Examples of User Experience (QoE)
completion of a
download file
End-to-end response
is fast
The voice and video
is Clare
Voice, Video Phone, MMS, WAP, Email, FTP, HTTP…
Service Performance
Radio Network KPI
AMR12.2, CS64k,PS64k/128k/384k, HSDPA/HSUPA
Accessibility
Retainability
Integrity
Mobility
Utilization
Statistic / Measurement data
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Availability
Huawei 3G KPIs Architecture
3G KPIs
Accessability
Retainability
• Call Setup
Success Rate
(Voice/VP)
• Call Drop
Rate
(Voice/VP)
• PDP Context
Activation
Success Rate
• PDP
Context
Drop Rate
Service Integrity
• PS Throughput
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• SHO
Success
Rate
• Hard
Handover
Success
Rate
• SMS/MMS
Success Rate
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Mobility
• Inter-RAT
Handover
Success
Rate
Page 10
Delay/Latency
Availability
• Call Setup Delay
(Voice/VP)
• Worst Cell
Rate
• PDP Context
Activation Time
• RTT
3G KPIs: It is not only a value
3G KPI is not only a value, but a system, for example of CDR (Call Drop Rate)
Network Planning
Network Construct
optimization
Root cause drop-call
Coverage
Hand
over
59.45%
Transmission
10.02%
Pilot
pollution
7.29%
Neighbor
cell
2G
Transport
problem
Interference Scramble congestionresource
4.56%
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0.68%
Page 11
0.68%
3%
2.28%
Others
11.94%
Call drop
cause
3G KPIs: Attainable
3G KPI is output of combination with investment include technology, HR,
cost, competition strategy etc.
Cost
Huawei KPI comply principle:
n Huawei will be responsibility for every complied KPI;
Reasonable
n Cooperate with Mobilis to work out a Competitive
KPIKPI;
target
n Use the experience
from other commercial network;
Competition
Attainable
Common target for Mobilis and Huawei
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Technical
3G KPIs: Time-bound
nMature Network
nOngoing Optimization
100
100
90
90
80
80
70
70
60
60
50
4050
3040
2030
1020
010
0
0
0
3
3
6
6
9
9
12
12
15
15
18
18
21
21
24
24
27
27
30
30
33
33
36
36
39
39
42
42
45
45
48
48
ü Drive Test KPIs
ü Stationary test KPIs
ü Network Statistics
Number of Sites
Number of Sites
ü Network Statistics
ü Benchmark test
nCommercial Launch
Nastar
Probe & Assistant
Probe & Assistant
n Pre-Launch
KPI Acceptance
Ea
lif c h K
ed P
ur I h
at a s
io
n
Probe & Assistant
ü Drive Test KPIs
ü Stationary test KPIs
nNetwork construct
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ü Site verification
Recommend test methodology
Pre-launch Acceptance
On-going Optimization
RRC connection success rate
Drive Test
-
Call setup success rate
Drive Test
Statistic Test
PDP activation success rate
Drive Test
Statistic Test
CS Call drop rate
Drive Test
Statistic Test
PS Call drop rate
Drive Test
Statistic Test
CS Call complete rate
-
Statistic Test
PS Call Complete rate
-
Statistic Test
HSPA Call drop rate
Stationary
Stationary
R99 PS Throughput
Stationary
Stationary
HSPA Throughput
Stationary
Stationary
Soft handover success rate
Drive Test
Statistic Test
Inter-RAT handover success
Drive Test
Statistic Test
Test Methodology
rate
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Contents
• UMTS Radio KPI overview
• 3G Radio Network Optimization
• Case Study of KPI Optimization
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Optimization throughout Life Cycle
Subs. Number
• RF adjustment
Drop call
• Para. adjustment
Congestion
• Maintenance and upgrade
Poor quality
• Contingency planning
Access failure
……
• Network expansion
Pr
ob
an lem
dr
a
es nal y
olu
s
tio is
n
Pre-launch optimization
Single site verification
• …….
Customized and
differentiated
services
Billing strategies
Investment
RF plan review
Construction
phase
Troubleshooting
DT & CQT
Commercia
l launch
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KPI
analysis
Complaints
Booming phase
Optimizing
Page 16
Return
Mature phase
Balancing
Time
Network Optimization Phases
Optimization
preparation
RF optimization
Service test and
parameter optimization
New site integrated
Routine drive test and
stats. analysis
Single site verification
N
80％ sites in the
cluster ready?
N
Y
Acceptance criteria
satisfied?
Y
Acceptance
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RF Optimization Target
n To optimize coverage
n To minimize pilot pollution
n To optimize cell dominance
n To optimize neighbor cell list
n To resolve RF-related drop calls
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RF Parameters Optimization
n Engineering parameters adjustment
To adjust antenna down tilt
To adjust antenna azimuth
To adjust antenna location
To adjust antenna height
To replace antenna
To replace site
To add new cell
n Radio part parameters adjustment
To optimize neighbor cell list
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Pilot Pollution Minimization
Pilot pollution definition:
Pilot pollution will result in:
(1) low signal quality
(2) decreased system
capacity
(3) Call drops easier
n SHO candidates (A)
n Active set size (B)
n If A>B, pilot pollution exists
-60
RSCP (dBm)
-65
Margin
-70
-75
-62
-64
-80
-66
-68
Ways to optimize:
(1) Antenna adjustment
(e.g. azimuth or down tilt)
(2) Pilot power optimization
-69
-85
-81
-90
SC1
SC2
Active Set
SC3
SC4
SC5
Pilot Pollution
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SC6
Not
Pilot Pollution
Page 20
Pilot Pollution: Example
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RF-related Drop Calls
Appearance
Problems
n Poor coverage
Poor RSCP & Ec/Io
n High interference
Poor Ec/Io or RTWP
n Poor UL coverage
UE max Tx power
n Poor dominance
many SHO events
n Pilot pollution
many cells present
n Missing neighbors
Fast change of RF conditions usually
causes drop calls, e.g. turning a corner.
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Para. Optimization Target
n To reduce access failures
n To reduce drop calls
Para. optimization
is an important step
after RF optimization
n To enhance service quality
Service quality and network resources
utilization will be improved after para.
optimization
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Parameters to be Optimized
n CCCH power allocation para.
n RL maximum power para.
Seldom
adjusted
n Cell re-selection para.
n Intra-freq. handover para.
An effective way to
reduce drop calls
n Inter-RAT handover para.
n Power control para.
n Access power para.
The influence caused by the
cell parameters adjustment
should be analyzed carefully.
n Other related para.
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Intra-freq. Re-selection Para.
Optimize Treselection, Qhysts and Sintrasearch so as to
have minimum ping-pong and minimum camped onto
wrong cell
Qhyst2
CPICH_Ec/Io
The black dotted line
is the serving cells.
CPICH_Ec/Io
Qhyst2
Qhyst2
Qhyst2
Qhyst2
The black dotted line
is the serving cells.
UE doesn’t camp
onto the best cells.
Sintrasearch
Qqualmin
UE doesn’t camp
onto the best cells.
Qqualmin
Treselection
Treselection
Treselection
Treselection
Treselection
Treselection, Qhyst2, Sintrasearch = 0
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Treselection
Treselection, Qhyst2, Sintrasearch != 0
Page 25
Time
Contents
• UMTS Radio KPI overview
• 3G Radio Network Optimization
• Case Study of KPI Optimization
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Case study from commercial projects
• Example of Accessibility KPI analysis
• Example of Call Drop KPI issue & solution
• Example of Throughput KPI issue analysis
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Example of accessibility KPIs issue
Trouble-shooting of RRC
setup and RAB assignment
problems:
• STEP1: Identify the counter with the
highest number
Breakdown of CS RAB failure (Counters)
VS.RAB.FailEstCS.I
UB.Band
• STEP2: Identify the Top 10 cells with
the same problem
VS.RAB.FailEstabCS.
Other.Cell
Breakdown of CS RRC failure (Counters)
VS.RRC.Rej.R
VS.RRC.Rej.Cod
Definition of Counters
L.Fail
e.Cong
l VS.RAB.FailEstPs.IUB.Band: The number of
RABs unsuccessfully established in a cell due
to IUB resource congestion causes.
• VS.RAB.FailEstabCS.Other.Cell:
Pre-admission control module reports
a resource congestion.
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VS.RAB.FailEstPS.
RIPFail
Page 28
VS.RRC.Rej.UL.C
RRC.FailConnEstab.
E.Cong
NoReply
• VS.RRC.Rej.UL.CE.Cong: RRC
setup failure due to lack of UL CE
resources
Analysis
The “worst” sites (cells) that have been found to have both IUB and CE
congestion issues:
n0109TO (cell id 578/579/580)
n0111TO (3882/3883/3884)
n0070TO (18641/18642/18643)
UL CE Occupation Rate
NodeB
Name
2007-02-19
2007-02-20
2007-02-21
2007-02-22
0070TO
120.83%
132.29%
132.29%
171.88%
0109TO
142.71%
175.00%
175.00%
180.21%
0111TO
158.33%
132.29%
132.29%
148.96%
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Suggested solution
A comparative analysis shows that, if excluding the problematic sites,
the KPI would improve substantially, say, AMR RAB assignment success
rate from 97.79% to 98.09%:
RRC Connection Setup Success
Rate (CS)(>98%)
AMR RAB Assignment Success
Rate(>98%)
Video Call RAB Assignment
Success Rate(>98%)
PS64 RAB Assignment Success
Rate(>97%)
PS128 RAB Assignment
Success Rate(>97%)
PS384 RAB Assignment
Success Rate(>97%)
KPIs (including IUB
KPIs (without IUB
Congestion sites)
Congestion sites)
99.17%(313992/316615)
99.35%(256449/258126)
97.79%(294499/301169)
98.09%(241127/245815)
Suggested action plan:
• CE/IUB expansion
98.31%(3314/3371)
98.67%(2891/2930)
84.93%(2462/2899)
83.10%(1981/2384)
98.48%(16674/16932)
98.80%(13638/13803)
97.53%(58114/59584)
97.81%(48854/49946)
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• Perform regular neighbour list
check to further tune the
performance
Case study from commercial projects
• Example of Accessibility KPI analysis
• Example of Call Drop KPI issue & solution
• Example of Throughput KPI issue analysis
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Example of Call drop rate issues
Drop Call Rate Voice(3G)
Drop Call Rate Video(3G)
Drop Call Rate (2G)
AMR12.2 Call Drop Rate
3.5%
Voice call drop rate
changes over a threemonth optimization
period
3.0%
2.5%
2.0%
1.5%
1.0%
0.5%
Zone1
Solving Voice call drop
rate problems in Top 3
zones
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2006-03-19
2006-03-17
2006-03-15
2006-03-13
2006-03-11
2006-03-09
2006-03-07
2006-03-05
2006-03-03
2006-03-01
2006-02-27
2006-02-25
2006-02-23
2006-02-21
2006-02-19
2006-02-17
2006-02-15
2006-02-13
2006-02-11
2006-02-09
2006-02-07
2006-02-05
2006-02-03
2006-02-01
2006-01-30
2006-01-28
2006-01-26
2006-01-24
2006-01-22
2006-01-20
2006-01-18
2006-01-16
0.0%
Zone2
Zone3
Page 32
What measures were taken to solve
the call drop problems?
Zone
Action time
Call drop rate
reduction
Optimization measures
Zone 1
Feb. 14-17
1.57%->1.27%
Zone 2
Feb. 23-25
1.38%->1.21%
Zone 3
Mar.2-6
1.34%->1.10%
ü Scrambling code planning
adjustment
ü System/handover
parameter tuning
ü Neighbour list optimization
ü RF optimization, etc.
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Case study from commercial projects
• Example of Accessibility KPI analysis
• Example of Call Drop KPI issue & solution
• Example of Throughput issue analysis
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Example of throughput KPI issues
45 Huawei sites
provide coverage
for DT route
(Madrid South
East)
Group
Service
FTP application
throughput
I/B PS
UL:384
DL:384
Minimum application
throughput DL
HSDPA
Target
Valid calls
Successful
KPI
UL > 300 kbps
DL > 361 kbps
118 (UL)
87 (DL)
118 (UL)
87 (DL)
319 (UL)
293 (DL)
> 384 Kbit/s
87
87
280
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Analysis: coverage problems
RNC 123
RNC 122
Areas that lack
dominant pilot
Drive test route
involves 3 Huawei
RNCs and 1 Nortel
RNC
RNC 121
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The impact of missing neighbours
• DL R99 throughput has been impacted by the interference generated by missing
neighbors, mostly concerning the new sites that had been recently put on air
• Areas with low throughput corresponds to bad Ec/Io figures and HHO to 2G
Low throughput
UE handover to GSM
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Other causes
In addition to coverage and missing neighbour causes, the HSDPA
minimum throughput problem is due to:
•
•
DT route crosses the IUR area where HSDPA calls are reconfigured to DCH
(H2D)
UE moves from a non-hotspot to a hotspot site in HSDPA connected mode
RNC 122
RNC 123
RNC 122
RNC 123
RNC 121
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RNC 121
Page 38
06.April 2006
Thank You
www.huawei.com
www.huawei
.com
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