1-ltedrivetestpostprocessingoverview-160408135310

1.LTE 1.LTE Drive Test Post Processing Overview

Author Title

: Ray Khastur : LTE Optimization Consultant

MobileComm MobileComm Professionals, Inc


Trainer Curiculum Vitae 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) VAS Engineer (2013 ~ 2014)  Huawei Tech, Assistant VAS 

Achievements Achievements : 

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


1.1 Post Processing Overview

Actix Overview


How to Load Logfile’s 2

1

3

MobileComm Professionals, Inc

What is Super Stream ?

Logfile 1 . . . Logfile N

Super Stream

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 superstream contains 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



RSRP Level

7



8

Layer 3 Message


Complete Analysis Template


Limitation • Actix suitable for TEMS, NEMO and XCAL Logfile. •

For HUAWEI Genex Probe only suitable by using Genex Assistant.


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/RRR CConnectionAttempt*100%

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

RRC Connection Setup, not relevant with the RRCConSetupComplete message


Conclusion of Accessibility Performance •

This method should be taken from short call Logfile.

RRC Attempt RRC Success RRC Fail

•

3 Layer message available for analysis.


1.2 Drivetest Reporting on Mobility Performance

Measurement Event


Parameter Configuration (Intra-Frequency Handover) Source eNB

UE

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)

1.A3 Measurement Control

Measure RSRP/RSRQ

A3 EventTriger

Mn  Ofn  Ocn  Hys  Ms  Ofs  Ocs  Off 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.

Target eNB

2.

A3 Measurement Reports

Handover preparation RRC Conn. Reconf. incl. 3 mobilityControlinformation

Random access procedure 4

RRC Conn. Reconf. Complete

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.


Parameter Configuration (Intra-Frequency Handover) Mn  Ofn  Ocn  Hys  Ms  Ofs  Ocs  Off

How strong needed, for RSRP Neighbour to perform Intrafreq HO Execution ?

Serving eNB Alamanda M-I-GF

Target eNB RC Veteran M-S-RT


Parameter Configuration (Intra-Frequency Handover) Mn  Ofn  Ocn  Hys  Ms  Ofs  Ocs  Off







Also called as CIO




Parameter Configuration (Intra-Frequency Handover) Mn  Ofn  Ocn  Hys  Ms  Ofs  Ocs  Off

How strong needed, for RSRP Neighbour to perform Intrafreq HO Execution ?

Serving eNB Alamanda M-I-GF

Target eNB RC Veteran M-S-RT

Mn + 0 dB + 0 dB – 1 dB > -90 dBm + 0 dB + 0 dB + 1 dB Mn > -90 dBm + 2 dB Mn > -88 dBm So, need more than +2 dB to perform Intrafreq HO in event A3 MobileComm Professionals, Inc

Parameter Configuration (Intra-Frequency Handover) To reduce Ping Pong effect, there is time to trigger to allowed Intrafreq HO


Parameter Configuration (Inter-Frequency Handover) UE

• Inter-frequency handover triggering process Event A2 triggers the GAP measurement.

Source eNB A3/A1/A2 Measurement 1. Control

Target eNB

Measure RSRP/RSRQ

Ms  Hys  Thresh Two GAP modes

A2 EventTriger

In a period of 40 ms (default) or 80 ms 2.

A2 Report

3

A4 Control

GAP measurement

Event A4 triggers the inter-frequency handover.

A4 EventTriger

4

A4 Reports

Handover preparation

Mn  Ofn  Ocn  Hys  Thresh


Mobility Performance

IntraFreq HOSR 100%

InterFreq HOSR 100%


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) MobileComm Professionals, Inc

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 MobileComm Professionals, Inc


Important thing in this Layer 3 message there are: Preamble Index assignment, transmission mode, TDD Ratio configuration, MobileComm Professionals, Inc


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


Mobility Performance (RRC Connection 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. MobileComm Professionals, Inc

Conclusion of Mobility Performance •

This method should be taken from long call Logfile.

•


Intrafreq

Interfreq


1.3 Drivetest Reporting on Integrity Performance

What is Integrity Performance ?

Why Internet in Indonesia so slow?


What is Integrity Performance ? From each Network Element has different capacity pipeline, causing Integrity performance so bad

1 Gbps

s 0 p 0 b 5 M

1 Gbps


What is Integrity Performance ? Optimization LTE not only RF Parts, so we have to cooperate to fix it on entire Network Element

1 Gbps

s p b G 4

1 Gbps


Introduction of LTE Radio Protocol Stack •

Two Planes in LTE Radio Protocol: –

User-plane: For user data transfer

–

Control-plane: For system



Main Functions of Control-plane: 



signaling transfer



•

Main Functions of User-plane: –

Header Compression 

–

Ciphering

–

Scheduling UE

– ARQ/HARQ User-plane protocol stack UE

eNB

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 Control-plane protocol stack eNB

MME

NAS

NAS

RRC

RRC

PDCP

PDCP

PDCP

PDCP

RLC

RLC

RLC

RLC

MAC

MAC

MAC

MAC

PHY

PHY

PHY

PHY


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

Beam Forming MIMO are active by using adaptive configuration


Beam Forming Configuration The setting of this parameter determines the transmission mode t hat applies to UEs served by a multiantenna 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 MobileComm Professionals, Inc

DL Scheduling Parameter

Can be set as EPF/PF/RR/MaxCI

Using DL MIMO 2x2


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. MobileComm Professionals, Inc

DL Throughput Comparison

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. MobileComm Professionals, Inc

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


Conclusion of Integrity Performance •

This method should be taken from long call Logfile.

•

There is no specific Layer 3 message available for analysis.

DL Throughput UL Throughput


1.4 Drive Drivetes testt Report eporting ing on Ret Retainabi ainability lity Performance

Measurement Event

Drop event happen after UE have been connected. RRC Attempt RRC Connected

Drop Event


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) MobileComm Professionals, Inc

Cell Selection Configuration


Conclusion of Retainability Performance •

This method should be taken from short call Logfile.

•



Thank You


1-ltedrivetestpostprocessingoverview-160408135310

Recommend Documents