Sharing Drive Test Analysis training 21 feb.pdf
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Transcript of Sharing Drive Test Analysis training 21 feb.pdf
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TOPIC
1• LTE Drive Test KPI
2• Optimization Principle
3• Drive Test Analysis Using Actix
4 • Bad Spot Analysis and Reporting
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LTE Drive Test and KPI
By : Abdul Ghony Fattah Ifur
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2. Drive Test KPI
• RRC connection request SuccessRateAccessibility
• E-RAB Abnormal Release Rate
• Drops call rate
• Round trip time
Retain ability
• DL User Throughput
• UL User ThroughputIntegrity
• HO Success RateMobility
Drive T
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2.1 Accessibility (1)
RRC Connection R
Rate=
# RRC CONNECTIO
RECONFIGURATIO
RRC CONNECTION
100%
Drive test meth
1.UE connect to s2.Perform FTB do
second
3.Call end
4.Idle 15 second
5.Repeat
LTE STATE
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2.1 Accessibility (2)CALL SETUP OVERVIEW
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2.2 Retain Ability
ERAB Drop Rate=
# Call dropped / # success calls * 100%
Drive test methodology1.UE connect to server
2.Perform FTB download for 5 minutes
3.Call end
4.Idle 15 second
5.Repeat
DATA RADIO BEARLTE RADIO LINK FAILURE DIAGRAM
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2.3 Integrity (2)
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2.4 Mobility
HO PROCEDURE
1. Measurem
2. Filtering of
3. Reporting o
result
4. Hard HO al
5. Execution o
HO SUCCES RATE = (HO SUCCESS / HO ATTEMP)* 100
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LTE Optimization Principle
By : Abdul Ghony Fattah Ifur
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Optimization Index
Detecting interference using field measurement
Detecting interference and bad coverage using counter
Detecting overshooting site
PCI optimization
Impact of interference on LTE network performance- importance ofphysical RF Optimization
f d
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Detecting Interference - Indicator
SINR• SINR measurement can indicate interference area, but it’s doesn’t necessary see all interfe
• Impacted by traffic load
• Depend on PCI Planning
RSRQ • RSRQ depend on network load
• RSRQ similar with Ec/No in 3G
RSRP• RSRP measurement with scanner is the most reliable way to detect area with possible inte
and bad dominance.
• Not impacted by network load
• The number of PCI with same mod 3 in e.g 5 dB Power window is a useful indicator
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Detecting Interference – SINR (SINR VS RSRP)
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Detecting Interference - RSRQ
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Detecting Interference - RSRP
O ti i ti I d
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Optimization Index
Detecting interference using field measurement
Detecting interference and bad coverage using counter
Detecting overshooting site
PCI optimization
Impact of interference on LTE network performance- importance ofphysical RF Optimization
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PUSCH SINR PUSCH RSSI M t
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PUSCH SINR, PUSCH RSSI Measurement
Optimization Index
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Optimization Index
Detecting interference using field measurement
Detecting interference and bad coverage using counter
Detecting overshooting site
PCI optimization
Impact of interference on LTE network performance- importance ofphysical RF Optimization
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Overshooting Site1. Cell with to large or largely distributed
dominance area
2. Will cause increase interference to other
cells
3. Can collect excessive amount of traffic.
How to detect overshooting
1. Drive Test : Analyzing HO p
and neighbor cell measuremLog
2. Counter : Cell pair HO analy
site distance information. I
to cell with long inter site d
3. Timing Advance Trace : Cel
analyze to finding long dist
OVERSHOOTING SITE
Optimization Index
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Optimization Index
Detecting interference using field measurement
Detecting interference and bad coverage using counter
Detecting overshooting site
PCI optimization
Impact of interference on LTE network performance- importance ofphysical RF Optimization
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PCI Conflict
PCI Collision• A PCI collision occurs between two or more intra-frequ
use an identical PCI but are insufficiently isolated.
•In this case, UEs in the overlapping area of the two cimplement signal synchronization or decoding.
PCI Confusion
A PCI confusion occurs between a detected cell and a neighborincells have the same frequency and PCI and if the reference signapower (RSRP) of the two cells reaches the handover threshold.The PCI confusion may lead to UE handover failures or service d
Case :eNodeB mistakenly considers that the detected cell is cell C and thandover to cell C. If the spot that the UE is on is not covered byB, a handover failure may occur.If two or more neighboring cells of a cell have the same frequencthere is a PCI conflict between these neighboring cells
Impact of PCImod3 collision on Tput
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Impact of PCImod3 collision on Tput
Optimization Index
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Optimization Index
Detecting interference using field measurement
Detecting interference and bad coverage using counter
Detecting overshooting site
PCI optimization
Impact of interference on LTE network performance- importance of
physical RF Optimization
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Impact of DL Load 0% VS 70%
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Impact of DL Load , 0% VS 70%
Antenna tilt tuning example (SINR before and after)
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Antenna tilt tuning example (SINR before and after)
Antenna tilt tuning example (CQI before an
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Antenna tilt tuning example (CQI before an
Antenna tilt tuning example (HO before and
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Antenna tilt tuning example (HO before and
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LTE Drive Test Analys Using Actix
By : Abdul Ghony Fattah Ifur
1. Open Actix Application
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1. Open Actix Application
Click this
1 2 3
2. Import Log File
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2. Import Log File
1 2
3. Create super stream
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3 C eate supe st ea
4. Import CellRef
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p
6. Setup Map
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p p
7. Setup Workspace Analysis 1/2
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p p y /
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8. DL Analysis
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y
9. UL Analysis
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y
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11. Save Workspace
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By : Abdul Ghony Fattah Ifur
Confidential
LTE Bad Spot Analysis and Reportin
1. Cross Feeder Analysis
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2. PCI Confusion Analysis
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3. Poor RSRP Analysis
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RECOMMEN
1. Add new si
Area
2. Healthy Ch
Sign and giv
or up tilt
4. Poor SINR Analysis
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RECOMMEN
1. Give down
2. Healthy Ch
with Red Si
down tilt o
5. Low DL THP Analysis
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RECOMMEN
1. Low DL THP
and Value R2. Value RI = 1
mode trans
because po
3. Poor SINR i
no site dom
4. Improve SI
down tilt ov
give up tilt/by poor SIN
6. Low UL THP Analysis
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RECOMMEN
1. Low UL THP
usage and L2. RSRP indica
3. Probably, in
start UL
7. HO Failure Analysis
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RECOMMEN
1. HO Failure
Area2. Need to ad