UWB Positioning Access with Offset Ranging for Precise TDOA
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Solution Overview
Problem
Existing wireless communication systems face challenges in achieving precise positioning accuracy, particularly in ultra-wideband (UWB) environments, due to limitations in time-difference of arrival (TDOA) measurements.
Innovation Solution
The method involves configuring initiator anchor nodes to transmit configuration information for ranging sessions with offset initiation times to enable precise TDOA measurements by a mobile device, utilizing scrambled timestamp generation parameters and spreading codes to de-spread and correlate positioning signals from multiple anchor nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple anchor nodes transmit positioning signals simultaneously, then positioning efficiency is improved, but measurement precision deteriorates due to signal interference
Solution Approach 1:
The patent segments the positioning system into multiple independent ranging sessions, each with dedicated time resources. Anchor nodes are assigned to different ranging sessions (first ranging session, second ranging session) with non-overlapping time windows, allowing simultaneous operations without interference. This segmentation enables multiple anchor nodes to contribute to positioning without causing measurement conflicts.
Solution Approach 2:
The patent implements periodic ranging sessions with structured time patterns. Each ranging session has defined start times, durations, and intervals. The initiator anchor node transmits configuration information indicating specific start times for different ranging sessions, creating a periodic measurement pattern that avoids signal interference while maintaining continuous positioning capability.
2Measurement precision
If ranging sessions are conducted sequentially to avoid interference, then measurement precision is maintained, but positioning efficiency deteriorates
Solution Approach 1:
The patent resolves the contradiction by transitioning from a single-time-dimension sequential approach to a multi-dimensional approach. Multiple ranging sessions operate in different time windows within a structured pattern, and different anchor nodes are assigned to different sessions. This dimensional organization allows simultaneous operations across multiple dimensions while maintaining precision within each dimension.
Solution Approach 2:
The initiator anchor node performs multiple functions: it acts as a positioning reference, transmits configuration information for multiple ranging sessions, and coordinates measurements from multiple responder anchor nodes. This multi-functionality enables the system to conduct multiple ranging operations through a single coordinating node, improving efficiency without sacrificing measurement quality.
3Measurement precision
If configuration information is transmitted to multiple anchor nodes, then positioning accuracy is improved, but system complexity increases
Solution Approach 1:
The patent applies local quality by providing customized configuration information to each anchor node based on its specific role and ranging session assignments. The initiator anchor node receives configuration for coordinating multiple sessions, while responder anchor nodes receive configuration for their specific measurement tasks. This localized configuration approach improves positioning accuracy through precise control while managing complexity by tailoring information only where needed.
Data Source
AI summary
Disclosed are techniques for wireless communication. In an aspect, an initiator anchor node transmits, to a first responder anchor node, first configuration information for a first ranging session between the initiator anchor node and the first responder anchor node, wherein the first configuration information indicates a first initiation time for the first ranging session, and transmits, to a second responder anchor node, second configuration information for a second ranging session between the initiator anchor node and the second responder anchor node, wherein the second configuration information indicates a second initiation time for the second ranging session, wherein the first and second ranging sessions are configured to enable a mobile device to obtain a first time-difference of arrival (TDOA) measurement and a second TDOA measurement for the first responder anchor node and the second responder anchor node, respectively, and wherein the second initiation time is offset from the first initiation time.