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LTE DT Theory, Tools and Preparation

• Its Time to Work smart not work hard

Author: Andreas YDNCo-Author: Valki RD

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Objective

• Understand Drive Test basic principals

• Know the basic parameters in DT 4G

• Concept both SSV and Cluster DT 4G

• Able to do DT 4G both ssv or cluster and not just collect the

data but analyze!!!

• Reporting with basic standard

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Drive Test Conceptual

- Drive test is conducted for checking coverage criteria of a cell with RF

- The data collected by drive test tool as log files is analyzed to evaluated various RFparameters of the network

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Major QOS KPI (LTE)

1. Accessibility = How easily user can access the network for innitiatecommunication

2. Retainability = how easily to keep the network at the good performance

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Major QOS KPI (LTE)

3. Mobility = how easliy the user can move to another place in connected modewithout disconnection

4. Integrity = How big the traffic in the network

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Major Parameter at DT LTE

1. RSRP (Reference Signal Received Power, the power of the reference signal, This is an LTE-specific drive test parameter and is used by devices to help determine handover points)

2. SINR: Signal-to-Noise Ratio, which compares the strength of the signal tobackground noise.

-70 dBm to -90 dBm → Good -91 dBm to -110 dBm → Normal -110 dBm to -130 dBm → Bad

16 dB to 30 dB → Good 1 dB to 15 dB → Normal -10 dB to 0 dB → Bad

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Major QOS KPI (LTE)

3. Throughput : the value from the UE to the EnodeB. We can measure two types suchas Download and Upload

4. Call Drop: Disconnection event while make a call.

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Important thing to DT efficient and effective

1. The parameter: a lot of DT Engineer didn’t know what he do while drive testing, ithave so many value inside the tools, but they just collect it without understandwhat the definition each parameter

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2. Route: Don’t make double job at the same route,it will waste your time. Pleasebe aware with your route and don’t duplicate it.

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3. Event: event is the most important thing, you can see when the event call drop,handover failure and make the analyze at that time. So you can explain to your RFEngineer what you have done in your work

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4. DT strategy: the main important thing in LTE is Throughput, that value is makesdifferrence between another technology such as 3G / 2G. Please make sure yourecord your DT in stable condition (Filezilla still copying file)

- Open large file- Open 3 file zilla

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5. Be active to analyze: some of DT engineer spent all the day to collect the data withoutknowing the result, it better for you to focus on your work and see if there any crossfeeder,bad spot result, or site Down,etc

A. Cross Feeder: which cell is cross feeder?

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B. Bad Spot ResultPlease give me the valid reason why the throughput is drop?

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Spesification and Supporting Software

1. Supporting Hardware- Laptop (windows Xp / 7,RAM min 2GB, Processor min

Core i3)- GPS NMEA- USB LTE modem Huawei E398S

2. Supporting software- Genex Probe and Genex Assistant (min v3.5)- Filezilla- Browser

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Software Installation

1. USB GPS NMEA

Do not connect the GPS before installation, it will change the ESN number Install GPS NMEA’s driver from your choosen directory After installation finish, connect the USB GPS NMEA to laptop

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How To Drive Test Using Genex Probe V 3.5

Open Probe V3.5 then connect LTE Dongle and USB GPS Klik Configure -> Device management-> Device configure add the MS, by following this below picture and choose the related COM port

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add the MS, by following this below picture and choose the related COM port

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Add The GPS NMEA by click add button and choose the COM Port

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Import Map By clicking the earth symbol and choose Jakarta Map

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Create the engineering Parameter in xls format (please use the following format)

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Import Engineering Paramete:Configuration ->Engineering parameter management-> import -> then choose LTE system, click browsse and choose the engineering parameter in xls format. Then click OPEN

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Match the probe parameter with the excel parameter (mandatory field)

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Test Plan Configuration

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4. Set test

parameters

1. Add test

2. Choose

equipment

3. Test

state

5. Test

statistic

Set different parameter according to different test, for example FTP Download