UWB Ranging Round Hopping for RF Interference Mitigation
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Solution Overview
Problem
Existing UWB-based positioning systems face inefficiencies and inaccuracies due to RF interferences from other UWB devices and Radio Access Technologies, leading to increased complexity and latency in existing interference mitigation solutions like clear channel assessment and time-hopping schemes.
Innovation Solution
Implement a method for UWB wireless ranging that involves detecting potential interferences, exchanging interference reports between devices, and determining a round hopping pattern to mitigate interference without significantly increasing MAC complexity or latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If clear channel assessment and time-hopping schemes are used to mitigate interference, then interference reduction is achieved, but MAC complexity and latency increase
Solution Approach 1:
The patent implements feedback mechanisms where UWB devices exchange interference reports containing detected interference information. The initiating device collects interference reports from multiple devices, determines round hopping patterns based on this feedback, and configures ranging sessions accordingly. This feedback-driven approach enables adaptive interference mitigation without requiring complex centralized control, resolving the contradiction between interference reduction and MAC complexity.
2Object-affected harmful factors
If clear channel assessment and time-hopping schemes are used to mitigate interference, then interference reduction is achieved, but latency increases
Solution Approach 1:
The patent performs preliminary interference detection and reporting during a setup phase before the actual ranging session. Devices exchange interference reports and the initiating device determines round hopping patterns in advance. This preliminary action allows the system to pre-configure interference mitigation strategies, avoiding real-time complex processing during ranging operations and thus reducing latency while maintaining interference reduction effectiveness.
3Object-affected harmful factors
If traditional interference mitigation methods are used, then interference is reduced, but measurement accuracy decreases due to increased complexity
Solution Approach 1:
The patent applies different interference mitigation strategies to different spatial locations and device pairs. Each UWB device reports local interference conditions, and the system configures device-specific round hopping patterns tailored to local interference characteristics. This localized approach maintains positioning accuracy by avoiding one-size-fits-all complex mitigation schemes, instead applying targeted simple solutions where needed.
Data Source
AI summary
In some implementations, a method of ultra-wideband (UWB) wireless ranging performed by a first UWB device, may comprise detecting a first potential interference of a first radio frequency (RF) channel. The method may also comprise receiving, from a second UWB device, an interference report indicating a second potential interference of the first RF channel detected by the second UWB device. The method may also comprise determining a round hopping pattern based on the first potential interference and the second potential interference for transmitting one or more UWB ranging messages between the first UWB device and the second UWB device. The method may also comprise transmitting, to the second UWB device, a UWB ranging session configuration indicative of the round hopping pattern.