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TestBench, December 2009 : A-GPS Over-the-Air Test Method

Business and Technology Implications

November 19, 2009

With the rise in Location Based Services (LBS) applications and the need to meet E911 requirements, the number of mobile cellular devices supporting Assisted GPS (A-GPS) is steadily growing. As one of the enabling LBS technologies, A-GPS offers customers higher position accuracy, quicker location fixes, and improved coverage of service in difficult locations, such as urban and in-building environments. As a result, mobile operators and device manufactures are looking for testing choices that quantify and benchmark real-world device performance.

Until recently, all industry-defined A-GPS test methodologies focused on testing the performance of a device over a cabled RF connection, bypassing the GPS antenna and associated circuitry, as shown in Figure 1. This approach does not give the complete picture of real-world device performance and its impact on the end-user experience of LBS applications. To achieve this, GPS performance testing needs to include all relevant components. An Over-The-Air (OTA) test methodology, shown in Figure 2, is the best solution to address this need.

This white paper presents an overview of the business and technology drivers for OTA A-GPS testing, which describes a method to satisfy the radiated testing requirements of all involved parties. While the white paper is intended for Department Managers, Lab and R&D Managers, and Engineers already working with A-GPS or OTA, the introductory content in the following sections is also beneficial for those unfamiliar with these concepts.

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A-GPS Over-the-Air Test Method White Paper

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