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Consulting | Training | ResearchCompany Confidential - Pinnacle Learning Center
MobileComm Professionals, Inc
1.LTE Drive Test Post Processing Overview
MobileComm Professionals, Inc Author : Ray KhasturTitle : LTE Optimization Consultant
Consulting | Training | ResearchCompany Confidential - Pinnacle Learning Center
MobileComm Professionals, Inc
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
Consulting | Training | ResearchCompany Confidential - Pinnacle Learning Center
MobileComm Professionals, Inc
Actix Overview
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MobileComm Professionals, Inc
How to Load Logfile’s
1
2
3
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MobileComm Professionals, Inc
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).
Consulting | Training | ResearchCompany Confidential - Pinnacle Learning Center
MobileComm Professionals, Inc
How to Create Superstream
4
5
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MobileComm Professionals, Inc
Display all required information (1)
On the Superstream Attribute, breakdown the information that we want to show into (Map, Chart or Table)
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MobileComm Professionals, Inc
Display all required information (2)
6 All Detail Information
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MobileComm Professionals, Inc
Display all required information (3)
7
RSRP Level
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MobileComm Professionals, Inc
Display all required information (4)
8
Layer 3 Message
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MobileComm Professionals, Inc
Complete Analysis Template
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MobileComm Professionals, Inc
• Actix suitable for TEMS, NEMO and XCAL Logfile.
• For HUAWEI Genex Probe only suitable by using
Genex Assistant.
Limitation
Company Confidential - Pinnacle Learning Center
1.2 Drivetest Reporting on Accessibility Performance
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MobileComm Professionals, Inc
Accessibility Performance
Attach Full 3 Layer
message
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Accessibility Performance (RACH)
RACH Fail when SINR Level very
poor
No KPI for RACH since Random Nature of
RACH
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MobileComm Professionals, Inc
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
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• 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
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1.2 Drivetest Reporting on Mobility Performance
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Measurement Event
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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
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Parameter Configuration (Intra-Frequency
Handover)
OffOcsOfsMsHysOcnOfnMn
Serving eNBAlamanda M-I-GF
Target eNBRC Veteran M-S-RT
How strong needed, for RSRP Neighbour to
perform Intrafreq HO Execution ?
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Parameter Configuration (Intra-Frequency
Handover)
OffOcsOfsMsHysOcnOfnMn
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MobileComm Professionals, Inc
Parameter Configuration (Intra-Frequency
Handover)
OffOcsOfsMsHysOcnOfnMn
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MobileComm Professionals, Inc
Parameter Configuration (Intra-Frequency
Handover)
OffOcsOfsMsHysOcnOfnMn
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MobileComm Professionals, Inc
Parameter Configuration (Intra-Frequency
Handover)
OffOcsOfsMsHysOcnOfnMn
Also called as CIO
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Parameter Configuration (Intra-Frequency
Handover)
OffOcsOfsMsHysOcnOfnMn
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MobileComm Professionals, Inc
Parameter Configuration (Intra-Frequency
Handover)
OffOcsOfsMsHysOcnOfnMn
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
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Parameter Configuration (Intra-Frequency
Handover)
To reduce Ping Pong effect, there is time to trigger to allowed Intrafreq HO
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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
Page 30
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Mobility Performance
IntraFreq HOSR100%
InterFreq HOSR100%
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Signaling Flow for Handover
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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)
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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
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MobileComm Professionals, Inc
Mobility Performance (RRC Connection
Reconfiguration)
Important thing in this Layer 3 message there are: Preamble Index
assignment, transmission mode, TDD Ratio configuration,
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Mobility Performance (RRC Connection
Reconfiguration)
Important thing in this Layer 3 message there are: Chippering and
Integrity Protection Algorithm
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MobileComm Professionals, Inc
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.
Consulting | Training | ResearchCompany Confidential - Pinnacle Learning Center
MobileComm Professionals, Inc
• This method should be taken from long call Logfile.
• 3 Layer message available for analysis.
Conclusion of Mobility Performance
Intrafreq
Interfreq
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1.3 Drivetest Reporting on Integrity Performance
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What is Integrity Performance ?
Why Internet in Indonesia so slow?
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What is Integrity Performance ?
50
0
Mb
ps
1 Gbps1 Gbps
From each Network Element has different
capacity pipeline, causing Integrity
performance so bad
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What is Integrity Performance ?
4 G
bp
s1 Gbps1 Gbps
Optimization LTE not only RF Parts, so we
have to cooperate to fix it on entire Network
Element
Consulting | Training | ResearchCompany Confidential - Pinnacle Learning Center
MobileComm Professionals, Inc
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
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Physical Layer DL Throughput
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Physical Layer DL Throughput
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Physical Layer DL Throughput
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Physical Layer DL Throughput
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Throughput Chart
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DL Throughput Performance
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Transmission Mode
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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.
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MIMO Cont’d
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MIMO Cont’d
PDCCH and PDSCH configured by C-RNTI
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MIMO Workflow
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Transmission Mode Configuration
OL Adaptive will be focus on TM2 or TM3 only.
Which no UE feedback
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Transmission Mode Configuration
No Adaptive will force selection of TM.OL (TM2/TM3)CL (TM4/TM6)
OC (TM2/TM3/TM4/TM6)
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Transmission Mode Configuration
This MML Command will force all area to be serve
with TM3 after Initial Access
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Beam Forming Configuration
Beam Forming MIMO are active by using adaptive
configuration
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Beam Forming Configuration
Beam Forming MIMO are active by using adaptive
configuration
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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.
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Beam Forming Animation
Note: Please review on Full Screen and Connected to the Internet Access.
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Mac DL Throughput Result
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DL PRB Utilization
High PRB Utilization for TD-LTE 15 MHz
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DL Scheduling Parameter
Can be set as EPF/PF/RR/MaxCI
Using DL MIMO2x2
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Antenna Configuration
Antenna set as 4T4R
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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.
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CQI Comparison
Afternoon 16:00 Midnight 02:00
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CQI Comparison
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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.
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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
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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
Page 71
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• 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
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1.4 Drivetest Reporting on Retainability Performance
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Measurement Event
Drop Event
RRC Connected
RRC Attempt
Drop event happen after UE have been connected.
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Drop Rate Calculation
Drop Rate % : RRCConnection_ReestablishmentFailed/RRCConnectionSetupOK*100%
Drop Rate : 1/116*100%: 0.86%
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RRC Reestablishment Request
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RRC Reestablishment Reject
From the drive test result shown that, minimum RSRQ value are below the allowable minimum threshold at -18 dB (U2000 Configuration)
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Cell Selection Configuration
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• This method should be taken from short call Logfile.
• 3 Layer message available for analysis.
Conclusion of Retainability Performance
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Thank You
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MobileComm Professionals, Inc
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
Author