Positioning Subframe Selection for Wireless Hearability
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Solution Overview
Problem
Current wireless communication systems face challenges in improving positioning accuracy due to sensitivity issues and non-line-of-sight propagation, requiring detection of multiple remote base stations to achieve reliable signal strength for terrestrial time difference of arrival methods, which increases processing gain and interferes with other services.
Innovation Solution
The system determines whether to transmit a measurement subframe or a low-interference subframe based on parameters like cell identity and time-dependent cell-specific parameters, using a pseudo-random function to minimize interference and enhance signal hearability for positioning purposes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If terrestrial time difference of arrival positioning methods are used to improve positioning accuracy, then positioning precision is improved, but processing gain increases and interferes with other services
Solution Approach 1:
The patent segments the positioning subframe transmission by creating two distinct types: measurement subframes for positioning purposes and low-interference subframes for other services. This segmentation allows the system to dedicate specific resources to positioning while minimizing interference to other communications, resolving the contradiction between positioning accuracy and service interference.
Solution Approach 2:
The patent applies local quality by making different parts of the subframe structure serve different functions. Measurement subframes are optimized for positioning signal transmission with appropriate processing gain, while low-interference subframes are designed to minimize impact on other services. This localized optimization resolves the contradiction by allowing high processing gain only where needed for positioning.
2Reliability
If multiple remote base stations are detected to achieve reliable signal strength, then positioning reliability is improved, but system complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring positioning subframes with known structures and parameters before transmission. The network node determines in advance which subframes will be measurement subframes and prepares them accordingly. This allows the user equipment to efficiently detect and process positioning signals without requiring complex real-time analysis of multiple remote base stations, thus improving reliability while reducing system complexity.
3Area of stationary object
If processing gain is increased to detect lower signal strengths, then indoor coverage is improved, but interference with other services increases
Solution Approach 1:
The patent segments transmission resources into measurement subframes that can use higher processing gain for indoor coverage and low-interference subframes that minimize impact on other services. This allows the system to provide enhanced indoor coverage where needed while maintaining service quality in other areas, resolving the contradiction between coverage area and interference.
Data Source
AI summary
Systems and methods provide for an increase in hearability by a user equipment (UE, 116). This increase in hearability can be used to improve positioning results. Two different types of positioning subframes can be transmitted by cells in a radio access network (RAN) to improve hearability: measurement subframes and low-interference subframes. The selection of which type of positioning subframe to transmit can be determined algorithmically by the transmitting entity.