Sharing Drive Test Analysis training 21 feb.pdf

8/17/2019 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



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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




PCI 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




PCI 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




PCI 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




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


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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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

Sharing Drive Test Analysis training 21 feb.pdf

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