Positioning Assistance Data for Mobile Device Location
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Solution Overview
Problem
Conventional OTDOA positioning systems provide inaccurate and unnecessarily large search windows for mobile devices, limiting their ability to quickly and accurately determine their position due to resource constraints and lack of support for multiple frequency channels.
Innovation Solution
A method and apparatus that generate assistance data with an assigned frequency channel number based on received cell information, allowing mobile devices to perform positioning measurements more accurately and efficiently by optimizing search windows and supporting multiple frequency channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional servers use rudimentary logic to determine search windows based on presumed physical location, then the search window coverage is increased, but the search window size becomes unnecessarily large and the center becomes inaccurate
Solution Approach 1:
The server performs preliminary calculations to determine the mobile device's physical location using cell information before generating the search window parameters. This preliminary positioning action enables the server to accurately predict the Time of Arrival (TOA) and set an optimal search window center and size, avoiding the need for the mobile device to search through unnecessarily large windows and reducing the time to acquire positioning signals.
2Reliability
If the mobile device searches for PRS signals using large search windows, then the coverage is increased, but the time to get a position fix is extended
Solution Approach 1:
The server dynamically adjusts the search window parameters (center and size) based on the mobile device's estimated physical location and the specific cell configuration. By optimizing these parameters, the mobile device can concentrate its search efforts in the most likely TOA range, significantly reducing the search time while maintaining high probability of successful signal acquisition.
3Adaptability or versatility
If conventional OTDOA servers provide assistance data on a single channel number, then the system complexity is reduced, but the adaptability to different frequency bands is limited
Solution Approach 1:
The server determines the mobile device's physical location and identifies which frequency channels are relevant based on the device's position and the network configuration. This approach provides multi-frequency support tailored to each device's needs, enabling the system to serve devices operating on different frequency bands while maintaining manageable data generation complexity through automated channel selection.
Data Source
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AI summary
A method for assisting a mobile device to perform positioning measurements on positioning signals periodically transmitted by at least some of a plurality of cells in a wireless communication network includes receiving cell information. The cell information is measured or otherwise obtained by the mobile device and includes measurements/data pertaining to one or more of the plurality of cells in the wireless communication network. The method includes generating assistance data to include an assigned frequency channel number for use by the mobile device for performing the positioning measurements based on the received cell information. The assistance data is then sent to the mobile device.