Position Estimate Selection for Non-Line-of-Sight Wireless Signals
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Solution Overview
Problem
Current wireless communication systems, particularly 4G standards, face challenges in achieving high spectral efficiency, numerous connections, and reduced latency, which are essential for the next-generation 5G mobile standard.
Innovation Solution
A user equipment (UE) is designed to determine its position using multiple position estimate hypotheses, each generated by different position estimating processes. These processes utilize various parameter values, and the UE reports a position estimate based on being line-of-sight to fewer than a threshold number of positioning signal sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single position estimating process is used, then the device complexity is reduced, but the position estimate accuracy and reliability deteriorate in challenging environments with fewer than threshold number of line-of-sight positioning signal sources
Solution Approach 1:
The patent segments the position estimating process into multiple distinct processes (first position estimating process and second position estimating process), each optimized for different signal conditions. The first process uses standard parameters while the second process uses modified parameters suitable for non-line-of-sight conditions, allowing the system to select the appropriate process based on the current environment.
Solution Approach 2:
The patent implements dynamic selection between different position estimating processes based on the determined signal environment. The system adapts by choosing the first process when sufficient line-of-sight sources are available and the second process when fewer than threshold sources are available, making the positioning system flexible and condition-dependent.
2Reliability
If multiple position estimating processes are used to improve reliability, then the convergence speed deteriorates due to additional processing time
Solution Approach 1:
The patent performs preliminary determination of the signal environment (line-of-sight source availability) before initiating the position estimating process. This preliminary action allows the system to pre-select the appropriate estimating process, avoiding the need to run multiple processes and compare results, thus maintaining fast convergence while ensuring reliability.
Solution Approach 2:
The patent creates a second position estimating process that mirrors the structure of the first process but uses different parameter values optimized for non-line-of-sight conditions. This copying approach allows the system to have pre-prepared alternative processes ready for immediate execution based on environmental conditions, rather than generating multiple estimates sequentially.
3Ease of operation
If standard position estimating parameters are used, then the process simplicity is maintained, but the position estimate availability deteriorates in environments with fewer than threshold number of positioning signal sources
Solution Approach 1:
The patent applies different parameter values in the second position estimating process specifically tailored for non-line-of-sight conditions, while maintaining standard parameters for line-of-sight conditions. This local quality approach ensures that each process is optimized for its specific operating environment, improving overall system adaptability without complicating the standard process.
Solution Approach 2:
The patent modifies specific parameter values in the second position estimating process to accommodate environments with fewer than threshold number of line-of-sight positioning signal sources. By changing parameters rather than fundamentally altering the estimating process structure, the system maintains operational simplicity while adapting to different environmental conditions.
Data Source
AI summary
A method includes: receiving one or more positioning signals; determining that a UE is line-of-sight to fewer than a threshold number of positioning signal sources; determining a first position estimate hypothesis for the UE using a first position estimating process and one or more first measurements of the positioning signal(s); determining a second position estimate hypothesis for the UE using a second position estimating process and one or more second measurements of the positioning signal(s), wherein the second position estimating process uses a second parameter value of a parameter and the parameter is absent from the first position estimating process or has a first parameter value that is different from the second parameter value; and reporting a reported position estimate based on the first position estimate hypothesis or the second position estimate hypothesis in response to the UE being line-of-sight to fewer than the threshold number of positioning signal sources.