Mobility

A-GPS Over-The-Air Test Method: Business and Technology Implications

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Executive Summary

There has been a sharp increase in mobile cellular devices supporting Assisted GPS (A-GPS) with the rise in Location Based Services (LBS) applications and need to meet E911 requirements. A-GPS has the advantage of higher position accuracy, quicker location fixes, and improved coverage of service in difficult locations leading to a parallel need by mobile operators and device manufactures, for testing choices that quantify and benchmark real-world device performance. Previous A-GPS test methodologies did not give a global view of real-world device performance and its impact on the end-user experience of LBS applications. The attempt of this paper is to present an overview of the business and technology drivers for OTA A-GPS testing, describing a method to satisfy the radiated testing requirements of all involved parties. Majority of these approaches used by cellular devices have limitations, such as reliability, accuracy and availability. The preferred method employed in mobile devices today is the Global Positioning System (GPS). Organizations, including CTIA, feel the need to create standardized test procedures for A-GPS OTA testing to objectively specify and validate acceptable performance. Version 3.0 of the CTIA OTA Test Plan is expected to compel many network operators to adopt the methodology to help ensure the performance of the A-GPS-capable devices they offer their customers.

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