Dynamic UWB Anchor Assignment for Channel Saturation
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Solution Overview
Problem
Ultra-Wideband (UWB) ranging technologies face challenges in scalability and channel saturation due to the requirement that all UWB anchors and clients must be on the same channel, leading to limited location accuracy and increased interference in complex mobile networking environments.
Innovation Solution
A control device dynamically assigns UWB anchors for mobile devices, selecting a primary anchor based on signal strength and collision tolerance mapping, which involves temporal and geometric collision maps to minimize interference and ensure accurate location tracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all UWB anchors and clients are assigned to the same channel to enable ranging, then ranging functionality is achieved, but channel saturation and signal collisions occur
Solution Approach 1:
The system divides the UWB anchor population into multiple groups, each operating on a different channel. The control device assigns anchors to specific channels based on spatial distribution and collision probability, allowing simultaneous ranging operations without channel saturation. This segmentation resolves the contradiction by enabling ranging functionality across multiple channels while preventing signal collisions that would occur on a single channel.
Solution Approach 2:
The system dynamically adjusts channel assignments and anchor group configurations based on real-time collision probability assessments and spatial relationships. The control device continuously monitors and reassigns anchors to optimize channel utilization, ensuring ranging functionality is maintained while adapting to changing environmental conditions to prevent channel saturation.
2Measurement precision
If UWB ranging is implemented in complex mobile networking environments, then location determination is achieved, but scalability is limited due to channel saturation
Solution Approach 1:
The system introduces a new dimension of spatial organization by dividing anchors into multiple groups with different spatial distributions. Each group operates semi-independently on its own channel, allowing the system to scale to larger environments without channel saturation. This multi-dimensional anchor grouping enables both high location accuracy through precise UWB ranging and improved scalability by distributing the ranging load across multiple spatial and channel dimensions.
3Productivity
If dynamic anchor reassignment is performed to reduce channel saturation, then scalability is improved, but system complexity increases
Solution Approach 1:
The control device serves as an intermediary that automatically manages anchor group assignments and channel allocations. It assesses collision probabilities, determines optimal spatial distributions, and assigns anchors to channels without requiring manual intervention. This intermediary management layer handles the complexity of dynamic reassignment, enabling scalability improvements while abstracting the complexity from the overall system operation.
Data Source
AI summary
Presented herein are techniques for assigning Ultra-Wideband (UWB) anchors for client ranging. A control device can monitor UWB ranging between a mobile device and a primary anchor. In response to determining that a signal strength between the mobile device and the primary anchor is below a threshold, the control device can identify anchors for which the mobile device has had a signal strength above the threshold during a period of time, and select one of the anchors as a new primary anchor for the mobile device. For example, the control device can select the new primary anchor based on a relative collision tolerance mapping for the new primary anchor and at least one other anchor within a UWB range of the new primary anchor. The control device can send a command causing UWB ranging to be performed between the mobile device and the new primary anchor.