179840460 Drive Test Nemo PDF
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Transcript of 179840460 Drive Test Nemo PDF
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Nemo Drive Test on 2G/3G
Networks
Toha Ardi Nugraha Trainer at Expert Coaching Clinic
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Network Optimization Process
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Reason of Drive Test?
1. Network Performance Monitoring
2. Maintenance
3. Benchmarking
4. Customer Complains
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Module 1 : Overview 3G System (1 hour)
Module 2 : Drive Test Concept (1,5 hour)
Module 3 : Drive Test on Field (2,5 hour)
Module 4 : Reporting (2 hour)
Module 5 : Analysis (2 hour)
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OVERVIEW 3G SYSTEM
Module 1
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Data Transmission
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GSM & UMTS Evolution
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3G/UMTS Architectures (Migration)
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Specification of GSM
Frequency band :
Uplink 890 915 Mhz
Downlink 935 960 Mhz
Duplex spacing : 45 Mhz
Carrier spacing : 200 khz
Modulation : GMSK
Access method : FDMA / TDMA
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GSM network Architecture (contd)
3 Subsystem in GSM network
- BSS (Base Station Subsystem)
- NSS (Network and Switching Subsystem)
- OSS/OMC (Operating and Support system or
Operating and Maintenance Centre)
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GSM network Architecture (contd)
BSS (Base Station SubSystem)
BTS (Base Transceiver Station)
- Radio equipment
- To transmit and Receive signal to MS
- Defined a Cell coverage
depend on the power transmit
BSC (Base Station Controller)
- RRM for several BTS
- Handover management
TRAU
- Rate adaption
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GSM network Architecture (contd)
NSS (Network and Switching Sub System)
MSC (Mobile Switching Centre)
HLR (Home Location Register)
VLR (Visitor Location Register)
AuC (Authentication Center)
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GSM network Architecture (contd)
Operation and Support System
Control and Monitor the Network
- NMC (Network Management Centre)
- Some OMC are controlled by NMC
- OMC (Operation and Maintenance Centre)
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GSM Frequency Bands
GSM type Frequency Band
Uplink (UL) Downlink (DL)
GSM 900 890-915 Mhz 935-960 Mhz
GSM 1800 (DCS 1800) 1710-1785 Mhz 1805-1880 Mhz
GSM 1900 (PCS 1900) 1850-1910 Mhz 1930-1990 Mhz
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GSM Channelization
Physical Channel
200 Khz (Frequency Carrier) consist of 8 TS
Logical Channel
Control Channel
Traffic Channel
Control Channel
Traffic Channel
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GSM channelization (Contd)
Logical channel
Chontrol Channel
Broadcast channel
Common Control Channel
Dedicated Control Channel
Traffic Channel
Full Rate Half rate
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3G/UMTS Concept
WCDMA Concept
UMTS Architecture
Channelization
Handover
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WCDMA - Wideband CDMA
Radio access technology for one of the UMTS access modes (UTRA FDD) using 5 MHz duplex channels.
Frame length is of 10 msec, Chip rate is 3.84 Mcps
All users share the same frequency and time domain
Users separated by the codes
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UMTS Radio Frequency Ranges
FDD (Frequency Division Duplex)
TDD (Time Division Duplex)
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Channelization in UMTS
Logical Channel between RLC and MAC
Specific for information types
What type of data to be transferred
Transport channel between MAC and PHY
Specific for how to transfer information? (quality guarantee)
How and with which type of characteristic the data is
transferred by the Physical
Layer
Physical Channel Exact Physical characteristics of the
radio channel
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WCDMA Channel (Cont.'s)
Spreading means increasing the signal bandwidth
Spreading includes two operations Channelization (increases signal bandwidth)
Orthogonal Spreading
Scrambling
(does not affect the signal bandwidth) Use pseudo-noise codes
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Handover Concept
Site B Site A
BSC
Posisi 1
Posisi 2
Posisi 3
Handover
Request
Handover
Request
Handover Req
Acknowledge
Handover Req
Acknowledge
Handover Req
Acknowledge
Handover
command Handover
Complete
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Handover: Types (2G)
Intracell handover MS moves from one sector to another sector within
same cell
IntraBSC handover MS moves from cell to another cell within same BSC
IntraMSC handover MS moves from cell to another cell from different BSC
within same MSC
InterMSC handover MS moves from cell to another cell from different BSC
and different MSC
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Handover: Types (3G)
Intra-System handovers
Intra-frequency handovers
Soft, Softer
Inter-frequency handovers
Hard
Inter-System handovers
Handover between WCDMA GSM (Hard)
Handover between WCDMA/FDD TDD
(Hard)
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Pilots Set
The handset considers pilots in sets
Active : pilot of sector actually in use
Candidate : pilots mobile requested, but not yet set up & transmitting by
system
Neighbors: pilots told t mobile by system, as nearby sectors to check
Remaining: any pilots used by system but not already in the other sets
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Soft Handover Algorithm
AS_Th AS_Th_HystAs_Rep_Hyst
As_Th + As_Th_Hyst
Cell 1 Connected
Event 1A
Add Cell 2Event 1C
Replace Cell 1 with Cell 3
Event 1B Remove Cell 3
CPICH 1
CPICH 2
CPICH 3
Time
Measurement
Quantity
T T T
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DRIVE TEST CONCEPT
Module 2
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Network Environment
UMTS Drive Test is testing and measuring performance of 3G/UMTS network.
Tools :
1. Software Nemo Outdoor
2. PC laptop
3. GPS
4. Scanner
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Reason of Drive Test?
Network Performance Monitoring
Maintenance
Benchmarking
Customer Complains
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Continuous Drive Test
Drive Test (outdoor)
GPS
Walk Test (indoor)
Pin point/way point
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Analyze Data Collection
Analyze data that was collected before
(from Log files)
To know some problems in current area
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Reporting
To Answer Analyze Data Collection (Objective Answer)
Optimization Consideration
Recommendation
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Parameters DT GSM
1. Rx Level
2. Rx Qual
3. SQI
4. Cell Id, BSIC
5. TA (Timing Advance)
6. ARFCN, etc
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Parameters DT UMTS
UARFCN (UMTS Absolute Radio Frequency Channel Number)
RSCP (Receive Signal Code Power)
RSSI (Receive Signal Strength Indicator)
SC (Scrambling Code)
Ec/No
UE TxPower (dBm)
Throughput
BER, etc
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Step 1:
Start >Settings> Control Panel > System
Or My Computer >
Manage > Device Manager
Open Device Manager
Step 2: Choose Hardware Tab in System Properties >
Click Device Manager.
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Open Device Manager
Step 3 :
Look port to conect hardware
(Modem)
Scanner/GPS & Check COM
Ports
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Connect UE & Check COM Ports
Double click the 3G Modem to check Trace port number > Check
under Modem Tab.
For UE Modem:
In device manager view:
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Start Nemo Outdoor 5.07 and Load
Workspace
Make sure the Nemo dongle is connected to the laptop.
Launch Nemo Outdoor 5.07.
Load the desired workspace.
Workspace should contains adequate information for the user to monitor.
Different workspace should be created for different setup configuration.
Nemo workspace are stored proper folder for easy access, eg.
C:\Nemo Tools\Nemo Outdoor\Workspaces
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Running Program
Start >Program Files > Nemo Tools > Nemo Outdoor 5
Workspace
Details
Device Configuration
Load a measurement
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User Interface Nemo Outdoor 5
Worksheet
Device graph
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Load Workspace
Step 3: Browse to Nemo Workspace Folder -> Select workspace > Click Open.
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Create Workspace
Parameter
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Add Devices
Step 1: Go to Measurement workspace > Add New Device.
Step 2: Click the Configuration part
> Trace port and Modem port
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Nemo Interface
Map Interface
Open map (.tab)
Nemo logfiles and other files are stored proper folder for easy access, eg.
C:\Nemo Tools\Results (.nmf)
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DRIVE TEST ON FIELD (OUTDOOR)
Module 3
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REPORTING
Module 4
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Map Info
Exporting from Nemo Outdoor
Select Parameters
Reporting KPI with Map Info
Layer Control
Symbol
Create Thematic Map
Define Network Performance
Open Table
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Export to Map Info
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Select Parameters
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Report KPI With Mapinfo
KPI (Key Performance Indicator) : key to detemaint Network performance.
like as , RSCP, Ec/No, etc
Mapinfo is Software for loading and mapping geogharphic analysis
File > open file (chose file extention .tab)
Ex : bandung.tap
Used Layer control
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Open Log files
Example file (.tab)
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Layer Control
Command:
View
Edit
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Create Symbol
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Create Thematic Map
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Create Thematic Map (Cont.'s)
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Create Thematic Map (Cont.'s)
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Reporting with Map Info
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Open Table
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ANALYSIS (TUNING THE NETWORK)
Module 4
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UMTS Optimization
3 Mayor Steps in Optimizing Network
UMTS performance indicator
Problem Signature
Tuning network
Specific Neighbor list
Managing excessive soft handoff
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3 Mayor Steps in Optimizing Network
RF optimization is the process of measuring,
analyzing, and tuning and existing network to meet network performance criteria
It usually occurs after the network planning is completed
It can be performed frequently to respond:
Changes or growth in the network
Customer complaints such as coverage,
dropped call etc.
The need to improve capacity.
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UMTS Performance Indicator
KPI Target :
RSCP (good > -85 dBm)
Ec/No ( > -8 dB)
BER (98%)
Analyze Pilot Pollution Area
Drop Call Rate (DCR)
HSR (Handover Success Rate)
Call Setup Success Rate (CSSR)
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Problem Signature
Missing Neighbor or No Neighbors defined for Site. (Database)
Poor Coverage Area.
Pilot Pollution Area
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Poor Coverage Area
Test mobile measurements
Antenna configuration check
Verification of RF network design
Propagation model verification
Link budget analysis
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Improving coverage
Cell spliting, Sectorisation
Difficult , Expensive
Primarily used for capacity enhancement
Overlaid cell structure
Micro- and picocells
Cellular repeaters
RNC
Node B
Node B
Node B
Node B
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Pilot Pollution
Active set UE > 3 and in range 5 dB or approximately 3 dB from the biggest active set.
Reduce system performance,
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Antenna Fine Tuning
Horizontal plane
Possible coverage weakness between sector
Interference reduction
Traffic load distribution
Vertical Plane
Interference reduction
Possible coverage weakness in the short to medium distance range
Traffic load distribution
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Tuning the Network
Solution (Antenna Adjustments)
Include :
Down tilting
Antenna Height
Azimuth
Type of antenna
Reason of Down tilting:
1 Reduce interference
2 Optimizing cell
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Antenna Configuration
General points to check
antenna type, e.g.
omni
directional 60, 90 or 120 degrees
electrical downtilt
antenna azimuth angle (for directional antenna)
coverage targets
antenna tilt angle
electrical + mechanical
diversity & isolation
e.g. space diversity,
polarisation diversity
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Type Antenna Down tilt
Mechanical down tilt
Physic, Sectoral
Electrical down tilt
Easy
0 0
Electrical Mechanical
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Typical antenna beam pattern
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Omni vs. Sectorised
OMNI cells - more difficult to optimize Electrical down tilt possible, however
same for entire cell
Parameters same for entire cell
Directional antenna narrower beam easier to control interference
tilting less efficient with wider beams
Sectorised cell site with different
downtilt angles
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Reference
Short Course In Building DCS 1800 Coverage, Mobile Communication Laboratory, 2009
Short Course Drive Test UMTS, Mobile Communication Laboratory, 2008
Short Course Drive Test CDMA 2001x and Optimization, Mobile Communication Laboratory, 2008
Short Course CDMA Drive Test and Optimization, Antenna Laboratory, 2007
Nemo_Outdoor_manual
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Thanks