Location Estimation Using Secondary Antenna Path Loss
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Solution Overview
Problem
Current location estimation methods for communications devices are inaccurate, especially when using only one or two antenna sites, due to limitations in timing measurements and active radio links, leading to poor angular location determination and increased uncertainty in location estimates.
Innovation Solution
The method involves determining a first location estimate based on signals from a primary antenna and a second location estimate using information from secondary antennas not actively used by the communications device, combining location and path loss information to refine the accuracy of the communications device's location.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If location estimation is based on signals from only one or two antenna sites, then the complexity of the system is reduced, but the measurement precision and reliability of location estimation deteriorate
Solution Approach 1:
The patent applies preliminary action by performing path loss analysis and distance calculations using secondary antennas before final location determination. The system pre-calculates expected path loss values and compares them against actual measurements to identify and exclude improbable locations, thereby improving location estimation accuracy even when limited to one or two antenna sites
Solution Approach 2:
The patent introduces path loss analysis as an intermediary mechanism between raw signal measurements and final location estimates. By using path loss calculations from secondary antennas as a filtering layer, the system can eliminate unrealistic location possibilities and refine the final location estimate without requiring additional antenna sites
2Ease of operation
If timing measurements are used for location estimation, then the location can be determined, but the angular location accuracy remains poor due to wide antenna beam widths
Solution Approach 1:
The patent transitions from two-dimensional angular location estimation (which is limited by antenna beam width) to incorporating path loss-based distance information as an additional dimensional constraint. By combining timing measurements with path loss analysis, the system creates a more constrained solution space that improves angular location accuracy without changing the physical antenna configuration
3Device complexity
If only active radio links are used for location measurement, then the measurement process is simplified, but the quantity of available measurement data is insufficient
Solution Approach 1:
The patent applies self-service by having the communications device perform measurements on secondary antennas even though these antennas are not actively used for communication. The device autonomously measures signal characteristics from secondary antennas and provides this additional measurement data to the network, enabling improved location estimation without requiring changes to the active communication links
Data Source
AI summary
In determining a location estimate for a communications device, at least one first location estimate is determined based on information relating to signals transmitted between the communications device and at least one first antenna of a communications system. At least one second antenna of the communications system is determined, the at least second antenna not used for communication by the communications device. Thereafter, a second location estimate for the communications device is determined based at least on the at least one first location estimate and information relating to the at least one second antenna.