DT Procedure
LTE Drive Test Procedure for Single Site Verification
08.2015
2015-9-7
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DT Procedure
Description Description The RF optimization phase focuses on optimiszation of distribution of radio signals in the network.The main test mothods is drive test Concentrate on the drive test,through which you can cllect radio signal data tested through the UE for analyzing coverage,handover,and interference of outdoor signals.
Test Preparations Preparaing Tools and Materials Before DT,prepare necessary software,hardware and materials to guarantee smooth perpformance of subsequent test and analysis tasks. Software Preparation: No.
Software Name
Function
1
GENEX Probe
Drive test
2
GENEX Assistant
DT data analysis
3
Google Earth
Display of geographic location and Environment of an eNodeB,and display of altitude
Remark
Hardware Preparation: No.
Device Name
Content
1
GPS
Ordinary GRAMIN series GPS Home-made BU353
2
Dongle
Probe dongle
3
Laptop
PM2.0G/1G/160G/USB/COM/Serial
4
Vehicle mounted inverter
DC to AC,over 300W
5
Car
Normal Car
Remark
Material Preparation: No. 2015-9-7
Material Needed
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DT Procedure
1
Engineering Parameter List
Latest version
2
Mapinfo map
Traffic road layer,latest station layer
3
Google earth
Software installation Before Drive Test, Make sure about necessary software and the hardware device have installed in the laptop.Such as GENEX Probe& Assistant. The Probe Operation Guide can refer to attachment：
Device connection After finished the hardware drive software,try to connect to Probe. To configure hardware using Probe.perform the following steps: Step1: Start GENEX Probe 2.3 software. Step2:Choose configuation>Device Management>Device Config.
Step3:Click the icon highlighted in red below.
Step4:Add the UE adjust the interval at which the UE can connect.
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Step5:Add the GPS device.
Step6:After configuring the hardware.click the connection icon.
If connection is successful,Probe will display the following
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Importing eNodeB information Step1:Importing eNodeB information
Step2:
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…End
Importing the electronic map layer
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…End
Producing a Test Plan In the Configuration menu,Click System Config ,and then choose Test Plan.In this section we decribe using the Test Plan functions.
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FTP Upload
FTP Download:
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…End
Configuring Probe
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Field test record
Afer Finishing all the above step. We can start the drive test. Step1:Planning the test route. We can plan the test road in the map before testing.It can improve our testing efficiency
Step2:Start Probe and build a new test project(or open the project you have saved) Step3:Connecting the device and start the test plan 2015-9-7
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Step4:Record the data file around the test areas Step5:Stop the test and export the test Log file to analysis
Drive Test Procedures
1.Coverage Test Objective The objective of this test is to check if there's swapped feeders and if the Radio Units and Antennae are radiating as supposed to be. Coverage Test radio parameters : Radio Parameters
Remarks
RSRP
reference Signal Radio Power, the power of the UE received.
SINR
signal to interference plus noise ratio ,the quality of the signal in UE received
RSRQ
reference signal received quality,show the quality of reference signal
PCI
physical cell identifier
1. Serving PCI For SSV this parameter can indicate whether the PCI is configured correctly or not and whether the antenna is connected correctly or not. Procedure
Expected Result
The test is done by driving all the roads around the sites in idle/active mode .
PCI served correctly in each sector as it should be as planned
GENEX Probe will display the serving PCI and record the log file.Check the PCI of different cell . Test result:
2-Serving RSRP Procedure
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Expected Result
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The test is done by driving all the roads around the sites in idle/active mode . GENEX Probe will display the serving RSRP and record the log file GENEX Assistant can analyse the log file and show the result on the map and statistics .
Near a cell : RSRP>=-80 dBm, (Excellent) in the middle of a cell : -100 =< RSRP < -80 (Good) at the edge of a cell : 110 =< RSRP <-100 (Fair) -120 =< RSRP <-110 (Poor) target: the minimum RSRP for UEs to camp on a cell is -109 dBm. The RSRP is greater than -110 dBm in 90% areas at the cell.
Test result:
3-Serving RSRQ Procedure
Expected Result
The test is done by driving all the roads around the sites in idle/active mode . GENEX Probe will display the serving RSRQ and record the log file. GENEX Assistant can analyse the log file and show the result on the map and statistics .
RSRQ >= -10 dB (Excellent) -12 dB =< RSRQ <-10 dB (Good) -14 dB =< RSRQ <-12 dB (Fair) -16 dB =< RSRQ <-14 dB (bad) target: The RSRQ is greater than -14 dB in 90% areas at the cell.
Test result: 3-Serving SINR
Procedure
Expected Result
The test is done by driving all the roads around the sites in idle/active mode . GENEX Probe will display the serving SINR and record the log file.
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SINR >= 30 (Excellent) 20 dB =< SINR < 30 dB (Very good)
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GENEX Assistant can analyse the log file and show the result on the map and statistics .
10 dB =< SINR < 20 dB (good) 0 dB =< SINR < 10 dB (Fair) 20 dB =< SINR < 0dB (poor) target : The SINR is greater than 0 dB in 90% areas at the cell.
Test result:
2. Throughput test Description 1- For each cell we should find MID Point and FAR Point away from the site to do DL&UL test. So we need to do 12 tests for a site (12 throughput screenshot pictures) 2- The throughput test is a static test just find a location in front of the sector where radio conditions are the best near by the test point for each cell. 3- During test you make sure you are always camping on same PCI ( the one of the sector) Throughput (DL&UL) Single user throughput is a key performance indicator of LTE system to ensure customer experience. This test case aims to check the single user downlink&uplink peak throughput performance when UDP services are enabled. Procedure
Expected Result
Start the UE tracing tool and monitor the following items: DL RSRP/SINR, RLC throughput, and rank or MIMO mode. Use the NetMeter or netpersec to trace throughput. and record the result of average throughput.
Operation succeeded.
Power on the UE to initiate the attach procedure.
The INITIAL UE MESSAGE and the last UPLINK NAS TRANSPORT messages in S1 interface tracing indicate that the attach procedure is successful.
Adjust the attenuator or move the UE to the cell center when do the peak throughput test.
The downlink SINR is greater than 25 db and RSRP is greater than -80 dBm.
Cut the screen picture of throughput(DL&UL), When we test in MID point (200m)&FAR point (1000m) away from the site
For MID point target throughput : DL:55Mbps, UL:25Mbps For FAR point target throughput:
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DL:15Mbps,UL:10Mbps Start downlink&uplink UDP data transfer using the Iperf tool.
Operation succeeded.
Record the logs of average RSRP, SINR, when you do the throughput
The throughput is stable.
Restore the configuration.
Operation succeeded.
Test result:
3.The Latence Test Test the latence Latency is the key performance of LTE system to ensure customer experience and consists of control plane latency and user plane latency. This test case aims to test the ping 32/1000 bytes latency under the following scenarios: stationary, target user on cell center, without load, pre-scheduled. Procedure
Expected Result
Open command prompt from windows and ping the ip address of the FTP server (10.10.19.148) on same location u where doing the throughput test and take snapshot of the block window. We do it once per sector Ping 32 bytes from the UE to the server for 50 times. Obtain the average, maximum, minimum E2E user plane latency and standard deviation for 32 bytes. Command: ping –n 50 –l 32 10.10.19.148
The average time value is less than 35 ms
Test result:
4.Handover Test The objective is to know if the HO is working between the 3 sectors of the site. Handover Test This test case involves the following elements: EPC, eNodeB , cell1,2,3, and UE Procedure
Expected Result
HO test is done in dedicated mode 1. Power on the UE and enable it to access cell 1. 2. Enable the UE to log in to the FTP server and download a file from the server.
The Target Value of Handover Success Rate(Intra-Frequency) is 90%
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3. Move the UE from the coverage of cell 1 to the coverage of cell 2/3, or adjust the attenuator to make the signal quality of cell 2/3 better than that of cell 1 to trigger a handover for the UE. 4. After the handover is complete, check the status of the FTP downloading task.. Remarks 1>. The following figure shows the message flow of intra-frequency handover procedure of intraeNodeB. (1). The UE sends the Measurement Report message (A3 Event) to the eNodeB. (2). The eNodeB sends the RRC Connection Reconfiguration message to the UE to indicate that the radio resource configuration information for UE random accessing. (3). The UE sends the RRC Reconfiguration Complete message to the target cell to confirm that the UE attaches to the target cell successfully. (4). The eNodeB sends the RRC Connect Reconfiguration message to the UE to indicate the configuration of UE measurement and gets back the RRC Reconfiguration Complete (Handover complete) message from the UE.
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