GL Communications, one of the global leaders in delivering telecom test and measurement solutions, has developed a Drive and Walk Testing solution using GL’s vMobile™ equipment.
“GL’s vMobile™ makes drive and walk testing simple and convenient. During the test you can connect to two mobile phones using the vMobile™ internal Bluetooth interfaces or connect to one mobile radio using the vMobile™ PTT analog interface. Automated testing is achieved using vMobile™ scripts for placing and receiving calls as well as sending/recording audio during the established calls. Audio analytical metrics include Voice Quality MOS using the POLQA algorithm (ITU-P.863) or using the PESQ algorithm (ITU-P.862), with automated DAQ conversion if required,” said Robert Bichefsky, Director of Engineering at GL Communications.
In addition to audio MOS, other metrics include one way and round-trip delay, signal and noise levels, audio dropout, frequency, and power analysis. Call metrics such as failed or dropped calls are also provided. The vMobile™ can work seamlessly with the existing GL VQuad™ solution for convenient end-to-end testing.
The vMobile™ includes embedded Wi-Fi for control/status as well as sending results and recorded audio to a centralized system for real-time analysis. If Wi-Fi is not available control and status of the vMobile™ can be done using a Bluetooth connection or directly from the on-board vMobile™ hardware menu. During the test, all results and events can be stamped with GPS coordinates using the on-board GPS receiver which includes external antenna to be used during drive testing while inside a vehicle. If testing inside a building or where GPS is not available, the vMobile™ Indoor Tracking System (ITS) can be used for plotting results.
vMobile™ Control including configuration, operation and status can be done using the vMobile™ Console web browser or Console app (installed on Android and IOS devices). If Wi-Fi is unavailable all control can be done via Bluetooth connection and all captured audio files can be pulled off the vMobile™ for analysis by simply connecting the vMobile™ to any PC via the USB-C interface (the vMobile™ will appear as a drive).
vMobile™ can also automate the GL NetTest (data testing) from any mobile device. NetTest includes an app (supports both Android and IOS devices) and can generate a variety of custom tests such as TCP (speed), UDP (capacity), HTTP, VoIP, FTP, DNS, and video simulation. All results are sent to the same Central Database and can be plotted on Google Maps using the mobile device GPS receiver. The below figure illustrates the results for the drive testing.
All results and events are sent to a Central database and accessed via the WebViewer™ (web browser). The WebViewer™ displays all measurements and call events and can generate custom reports which include line and bar graphs. Results can be plotted to Google Maps using custom pins depicting pass/fail and errors during the testing. From WebViewer™ users can schedule automatic reports to be emailed to any address.
Drive and Walk tests use two mobile phones connected to a single vMobile™. The vMobile™ is running a simple script for placing and answering calls, and during the call sending and recording voice files within an embedded loop. The voice files are analyzed using the POLQA algorithm while also providing Signal/Noise levels, Speech Activity, and Audio Dropout analysis. The vMobile™ is connected via Wi-Fi to the mobile phone tethered interface and control of the vMobile™ is done using the Console app.
The Drive test was from Gaithersburg MD to Ocean City, NJ USA and lasted approximately three and a half hours. The walk test was on the boardwalk of Ocean City, NJ and lasted approximately 40 minutes. The below figure shows the walk test results.
During both tests the vMobile™ along with both mobile phones were placed in a small lightweight backpack (total weight 2 lbs), easy for travel and easy to carry during the walk test. The on-board vMobile™ battery was sufficient for this drive and walk tests, however if extended tests are required an external Power bank (lightweight and inexpensive) can be connected to the vMobile™.
Click here to learn more about the drive and walk testing solution from GL Communications.
