Monday, 9 January 2017

LTE-Basic operation and application of QXDM(Qualcomm terminal software)

When we do the DT in outfield, we often use a Qualcomm terminal software named “QXDM”.

Here, I will introduce the basic operation and application of the software.
QXDM is short for “Qualcomm Extensible Diagnostic Monitor”. It’s the diagnosis platform of Dual-Mode Subscriber Station (DMSS). After the installation of QXDM, click “QXDM Professional” and begin to register. As shown in the figure below:
1. Add Port
   When the registration is completed, insert the terminal. As there is no relevant port number, generally, “Disconnect” will exist on the QXDM. And "Command" is not available in the toolbar. As shown in the figure below:
   Firstly, choose the port: Options—Communications. According to the testing results of the port,choose the port, and others remain the acquiescent configurations. And then, click “ok”. There will be “MDM9200” which is shown in the figure below:
 If there is no Diagnostics port, we need to open QPST Configuration and add the port, which is shown as follow:  
 In the Port part, click “Add New Port” . And then add the “Diagnostics port”. There will be “MDM9200” which is shown as follow picture: 
2.Common Ports:
       If the ports are loaded successfully,open the QXDM. The common windows are present as follow:
1)     (1) LTE ML1 Idle Serving Cell Measurements DisplayCheck the physical cell ID and frequency, check the RSRP and SINR.
2)     (2) LTE ML1 DL Throughput and BLERCheck L1 dataflow and BLER.
3)     (3) Filtered View{RRC&NAS}Check the RARRCNAS massages during the attachment of UE.
   (4) LTE RRC State Change Plot:Check RRC state during the attachment of UE.
 The configuration files can be saved by shortcut “Ctrl+S” from the four above windows. For example, TD-LTE_IOT_Config.dmc, we can load the configuration files by shortcut “Ctrl+O”. What’s more, we can also check the detailed messages by “right-hand button-Cursor”.
3. The way to check L1-L3 log
The First step: Click shortcut F12. And then, the window will turn out which is shown below. Click “right key” and Config or shortcut “Alt+G” to open the Window Filters.
 The second step:Open the window Filters shown as follow.  Choose “Log Packets”、”Filter/Register On Target For Items”, you will get the log of L1-L3.
The third step: Choose the message which need to observe. Here we use the process of UE attaching as example. Shown as follow, choose the Msg1-4 of “RRC”、”NAS”、”ML1”, click “OK”.
 
The four step: Insert and pull out the terminal, we can catch the process of UE attaching.
 
4. The shortcut key to save log
   Save all the logs: Ctrl+i
   Clear away the logs of all the windows: Alt+i
   Clear away the logs of the single window: shift+delete

Budi Prasetyo

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