UWB Ranging Retransmissions With Channel Hopping Against Cellular Interference
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Solution Overview
Problem
The potential interference between Ultra-wideband (UWB) communications and future cellular communication systems, such as 5G and 6G, due to overlapping frequency spectra, affects the performance of UWB devices by preventing Double-sided Two-Way Ranging (DS-TWR) with responders.
Innovation Solution
Implementing channel hopping patterns in UWB devices to mitigate interference, using deterministic or random/pseudo-random patterns based on packet-specific or channel-specific confidence metrics, allowing retransmission of ranging initiation messages on different slots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UWB devices operate in the 7 GHz to 10 GHz frequency band, then high-bandwidth communication and accurate positioning are achieved, but interference from future cellular systems (5G/6G) prevents reliable DS-TWR ranging
Solution Approach 1:
The patent implements dynamic channel hopping where the UWB device transitions between different frequency channels within the 7-10 GHz band during the ranging process. Instead of operating on a fixed frequency, the device dynamically selects channels based on pre-configured hopping patterns, allowing it to avoid interference from cellular systems that may be active on specific frequencies at specific times.
Solution Approach 2:
The patent changes the frequency parameter of the UWB signal by implementing channel hopping across multiple frequency channels. The device configures a hopping pattern that varies the operating frequency across different time slots, transforming the static frequency operation into a dynamic multi-frequency approach to evade cellular interference.
2Reliability
If channel hopping is implemented to avoid cellular interference, then DS-TWR ranging reliability is improved, but communication complexity increases due to pattern configuration and slot management
Solution Approach 1:
The patent applies preliminary action by pre-configuring the channel hopping pattern before the ranging process begins. The device establishes the frequency hopping sequence and slot allocations in advance, so that during actual ranging operations, the device simply follows the predetermined pattern rather than making real-time decisions about channel selection, reducing operational complexity.
Solution Approach 2:
The patent implements periodic channel hopping where the device systematically transitions through a predefined sequence of frequency channels at regular time intervals corresponding to ranging slots. This periodic structure provides a predictable and manageable complexity pattern, allowing both transmitting and receiving devices to synchronize their frequency changes without requiring complex real-time negotiation.
Data Source
AI summary
A device for avoiding interference. The device comprising: at least one transceiver; at least one memory; and at least one processor, in signal communication with the at least one transceiver, and the at least one memory, the at least one processor configured to: transmit, with the at least one transceiver, a ranging control message (RCM) to schedule a ranging session with a second device, where the ranging session includes a plurality of consecutive ranging blocks, each ranging block includes a plurality of ranging rounds, each ranging round includes a plurality of ranging slots, and the schedule includes a channel hopping pattern for the plurality of ranging slots; transmit a ranging initiation message (RIM) on a first ranging slot; and retransmit the RIM on a second ranging slot, different from the first ranging slot, baes on the channel hopping pattern.