lte drive test post processing overview

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MobileComm Professionals, Inc

1.LTE Drive Test Post Processing Overview

MobileComm Professionals, Inc Author : Ray KhasturTitle : LTE Optimization Consultant



Valki Rama Dhani, ST.

Educational Background : Bachelor of Computer Engineer, Telkom Institute of Technology (2008 – 2012)

Professional Experience : PI.Works, Telecommunication Engineer (2014 ~ Present) China JIESAI, Coordinator and LTE Engineer (2013 ~ 2014) Huawei Tech, Assistant VAS Engineer (2013 ~ 2014)

Achievements : Freshman Award 2013-2014 China JIESAI Excellent staff 2014-2014 China JIESAI Training in China, February 2014 China JIESAI LTE Drive test and Basic Optimization Trainer FastConn 2015-2016 Best Team at Telkomsel Project 1st Quarter China JIESAI 2015

Trainer Curiculum Vitae

Company Confidential - Pinnacle Learning Center

1.1 Post Processing Overview



Actix Overview



How to Load Logfile’s

1

2

3



What is Super Stream ?

Logfile 1...

Logfile N

SuperStream

A superstream is a new stream created by merging two or more sets of data into one large data set. Beware that the size can be huge (since the superstreamcontains all attributes, even those that we might not need in our analysis).



How to Create Superstream

4

5



Display all required information (1)

On the Superstream Attribute, breakdown the information that we want to show into (Map, Chart or Table)




6 All Detail Information




7

RSRP Level




8

Layer 3 Message



Complete Analysis Template



• Actix suitable for TEMS, NEMO and XCAL Logfile.

• For HUAWEI Genex Probe only suitable by using

Genex Assistant.

Limitation


1.2 Drivetest Reporting on Accessibility Performance



Accessibility Performance

Attach Full 3 Layer

message



Accessibility Performance (RACH)

RACH Fail when SINR Level very

poor

No KPI for RACH since Random Nature of

RACH



Accessibility Performance (RRC)

RRC SSR[%]=RRCConnectionSetupOK/RRRCConnectionAttempt*100%

No RRC Setup Failure in this report,RRC SSR 100%

RRC Connection Setup, not relevant with the

RRCConSetupCompletemessage



• This method should be taken from short call Logfile.

• 3 Layer message available for analysis.

Conclusion of Accessibility Performance

RRC Attempt

RRC Success

RRC Fail


1.2 Drivetest Reporting on Mobility Performance



Measurement Event



Parameter Configuration (Intra-Frequency

Handover)

Handover-related parameters are used to control the reporting time and

difficulty level of a handover in the measurement report. For details about

handover parameter configuration, see

eRAN3.0 Handover-related MML Command Configuration Guide

•Intra-frequency handover triggering process (event A3)

Mn indicates the measured Reference Signal Received Power (RSRP)

and Reference Signal Received Quality (RSRQ) of neighboring cells.

Ofn indicates the frequency offset.

Ocn indicates the neighboring-cell offset to be configured through the

neighboring relationship.

Ms indicates the measured RSRP and RSRQ of the serving cell.

Ofs indicates the offset of the serving frequency.

Ocs indicates the offset of the serving cell.

Hys indicates the hysteresis, closely related to the service feature and

the mobility speed.

Reducing the probability of ping-pong effect.

Off a3-Offset

Mn, Ms is in units of dBm or dB. Other parameters are in units of dB.

2.A3 Measurement

Reports

3RRC Conn. Reconf. incl.

mobilityControlinformation

4 RRC Conn. Reconf. Complete

UESource

eNB

Target

eNB

1.A3 Measurement Control

Handover preparation

Random access procedure

Measure RSRP/RSRQ

A3 EventTriger

OffOcsOfsMsHysOcnOfnMn




Handover)


Serving eNBAlamanda M-I-GF

Target eNBRC Veteran M-S-RT

How strong needed, for RSRP Neighbour to

perform Intrafreq HO Execution ?




Handover)





Handover)


Also called as CIO




Handover)





Handover)


Serving eNBAlamanda M-I-GF

Target eNBRC Veteran M-S-RT

How strong needed, for RSRP Neighbour to

perform Intrafreq HO Execution ?

Mn + 0 dB + 0 dB – 1 dB > -90 dBm + 0 dB + 0 dB + 1 dBMn > -90 dBm + 2 dBMn > -88 dBm

So, need more than +2 dB to perform Intrafreq HO in event A3




Handover)

To reduce Ping Pong effect, there is time to trigger to allowed Intrafreq HO



Parameter Configuration (Inter-Frequency

Handover)

• Inter-frequency handover triggering

processEvent A2 triggers the GAP measurement.

Two GAP modes

In a period of 40 ms (default) or 80 ms

Event A4 triggers the inter-frequency handover.

2. A2 Report

UESource

eNB

Target

eNB

1.A3/A1/A2 Measurement

Control

Handover preparation

Measure RSRP/RSRQ

A2 EventTriger

3 A4 Control

GAP measurement

A4 EventTriger

4 A4 Reports

ThreshHysMs

ThreshHysOcnOfnMn



Mobility Performance

IntraFreq HOSR100%

InterFreq HOSR100%



Signaling Flow for Handover



Mobility Performance (Measurement Report)

In this case there are Event A3 measurement report. Which showing Neighbor RSRP(-72 dBm) bigger than

Serving RSRP(-77 dBm)



Mobility Performance (RRC Connection

Reconfiguration)

Important thing in this Layer 3 message there are: Target PCI, Target DL EARFCN, RSI Information,T304 and

RS Power from Target eNB




Reconfiguration)

Important thing in this Layer 3 message there are: Preamble Index

assignment, transmission mode, TDD Ratio configuration,




Reconfiguration)

Important thing in this Layer 3 message there are: Chippering and

Integrity Protection Algorithm




Reconfiguration Complete)

Important thing in this Layer 3 message there are: Information of

successful Handover Process. And on below that message contain RACH

Contention Free information during HO Process.



• This method should be taken from long call Logfile.


Conclusion of Mobility Performance

Intrafreq

Interfreq


1.3 Drivetest Reporting on Integrity Performance



What is Integrity Performance ?

Why Internet in Indonesia so slow?




50

0

Mb

ps

1 Gbps1 Gbps

From each Network Element has different

capacity pipeline, causing Integrity

performance so bad




4 G

bp

s1 Gbps1 Gbps

Optimization LTE not only RF Parts, so we

have to cooperate to fix it on entire Network

Element



Introduction of LTE Radio Protocol Stack

• Two Planes in LTE Radio Protocol:

– User-plane: For user data transfer

– Control-plane: For system

signaling transfer

• Main Functions of User-plane:

– Header Compression

– Ciphering

– Scheduling

– ARQ/HARQ

eNB

PHY

UE

PHY

MAC

RLC

MAC

PDCPPDCP

RLC

eNB

PHY

UE

PHY

MAC

RLC

MAC

MME

RLC

NAS NAS

RRC RRC

PDCP PDCP

Main Functions of Control-plane:

RLC and MAC layers perform the same functions

as for the user plane

PDCP layer performs ciphering and integrity

protection

RRC layer performs broadcast, paging, connection

management, RB control, mobility functions, UE

measurement reporting and control

NAS layer performs EPS bearer management,

authentication, security control

User-plane protocol stack

Control-plane protocol stack



Physical Layer DL Throughput



Throughput Chart



DL Throughput Performance



Transmission Mode



MIMO

MIMO is developed to provide doubled and more spectral efficiency. As an extension of singlei nput

single-output (SISO), MIMO uses multiple antennas at the transmitter and/or receiver in

combination with some signal processing techniques. Generally speaking, single-input multiple output

(SIMO), multiple-input single-output (MISO), and beamforming also belong to the

MIMO category.



MIMO Cont’d



MIMO Cont’d

PDCCH and PDSCH configured by C-RNTI



MIMO Workflow



Transmission Mode Configuration

OL Adaptive will be focus on TM2 or TM3 only.

Which no UE feedback




No Adaptive will force selection of TM.OL (TM2/TM3)CL (TM4/TM6)

OC (TM2/TM3/TM4/TM6)




This MML Command will force all area to be serve

with TM3 after Initial Access



Beam Forming Configuration

Beam Forming MIMO are active by using adaptive

configuration



Beam Forming Configuration

The setting of this parameter determines the transmission mode that applies to UEs served by a multi-antenna eNodeB. The transmission modes vary with the application scenarios: 1. TM2 applies to UEs with low SINR and a high speed. 2. TM3 applies to UEs with high SINR and a high speed. 3. TM4 applies to UEs with high SINR and a low speed. 4. TM7 applies to UEs with low SINR and a low speed. 5. TM8 applies to UEs with high SINR and a low speed. 6. TM9w/oPMI applies to UEs with high SINR and a low speed. 7. TM9wPMI applies to UEs with high SINR and a low speed. The throughput and coverage achieve the best performance only when the setting of this parameter match the SINR and speed mobility of UEs. Otherwise, the performance is worse than that with the optimal transmission mode.



Beam Forming Animation

Note: Please review on Full Screen and Connected to the Internet Access.



Mac DL Throughput Result



DL PRB Utilization

High PRB Utilization for TD-LTE 15 MHz



DL Scheduling Parameter

Can be set as EPF/PF/RR/MaxCI

Using DL MIMO2x2



Antenna Configuration

Antenna set as 4T4R



Rank Indicator

In simple words, RI is an indicator showing how well multiple Antenna work. What do you mean by "how well the multiple Antenna work ?". We usually say "Each of the multiple antenna (e.g, each antenna in MIMO configuration) works well if the signal from each antenna has NO correlation to each other". "No correlation" implies "no interference to each other".Maxmum RI value is very closely related to the number of Antenna. Maximum RI is same as number of antenna on each side if the number of Tx antenna and Rx antenna is same. If the number of Tx and Rx are different, the one with less antenna is the same as Max achievable RI.

Max RI means "No Correlation between the antenna", "No interference to each other", "Best Performance".For example, in case of 2x2 MIMO, the RI value can be 1 or 2. When the value 2 in this case means "No Correlation between the antenna", "No interference to each other", "Best Performance". If the value is 1, it implies that the signal from the two Tx antenna is percieved by UE to be like single signal from single Antenna, which means the worst performance.



CQI Comparison

Afternoon 16:00 Midnight 02:00



CQI Comparison



DL Throughput Comparison

Afternoon 16:00 Midnight 02:00

During Low Utilization of DL PRB on Cell Level give benefit for single UE can get higher DL PRB which is related to the Higher DL Throughput.



During Low Utilization of DL PRB on Cell Level give benefit for single UE can get higher DL PRB which is related to the Higher DL Throughput.

DL Throughput Comparison



CQI to MCS

CQI stands for Channel Quality Indicator. As the name implies,

it is an indicator carrying the information on how good/bad the

communication channel quality is. This CQI is for HSDPA. (LTE

also has CQI for its own purpose).

CQI is the information that UE sends to the network and

practically it implies the following two

i) Current Communication Channel Quality is this-and-that..

ii) I (UE) wants to get the data with this-and-that transport block

size, which in turn can be directly converted into throughput



• This method should be taken from long call Logfile.

• There is no specific Layer 3 message available for analysis.

Conclusion of Integrity Performance

DL Throughput

UL Throughput


1.4 Drivetest Reporting on Retainability Performance



Measurement Event

Drop Event

RRC Connected

RRC Attempt

Drop event happen after UE have been connected.



Drop Rate Calculation

Drop Rate % : RRCConnection_ReestablishmentFailed/RRCConnectionSetupOK*100%

Drop Rate : 1/116*100%: 0.86%



RRC Reestablishment Request



RRC Reestablishment Reject

From the drive test result shown that, minimum RSRQ value are below the allowable minimum threshold at -18 dB (U2000 Configuration)



Cell Selection Configuration



• This method should be taken from short call Logfile.


Conclusion of Retainability Performance



Thank You



Ray Khastur, ST.

Educational Background : Bachelor of Telecommunication Engineer, Telkom Institute of Technology (2006 –2010) JPPA-N Acceleration

Professional Experience : PI.Works, RAN Consultant (2014 ~ Present) China JIESAI, LTE Optimization Consultant (2014) Lintas Media Telekomunikasi, LTE RF Team Leader (2013 ~ 2014) HUAWEI Tech Investment, CWiL RNP/O Engineer (2011 ~ 2013) Transdata Global Network, CDMA RNO Engineer (2010 ~2011)

Achievements : RF Network Design & Planning First Commercial LTE Network in Indonesia (BOLT! Super 4G LTE)-2013 HUAWEI NPI & Post Launch Optimization BOLT! Super 4G LTE - 2014 PI.Works LTE Technical Expert for HUAWEI Environment LTE Planning & Optimization Trainer Floatway Certified-2013 LTE HUAWEI Trainer for Subcont-2016

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lte drive test post processing overview

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