Hybrid UWB Ranging Sessions for Accurate Distance Measurement
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently utilizing ranging resources and managing service time in ultra-wide band (UWB)-based systems, particularly in IoT environments where accurate distance measurement and data transmission are crucial.
Innovation Solution
A method for hybrid ranging in UWB systems involving exchanging messages for downlink time-difference-of-arrival (DL-TDoA) and two-way ranging (TWR) with allocated session IDs, utilizing ranging rounds in ranging blocks to efficiently utilize and manage resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If hybrid ranging is performed using multiple message exchanges (DL-TDoA and TWR) in separate periods, then measurement precision is improved, but device complexity increases due to multiple session ID allocations and message management
Solution Approach 1:
The ranging process is segmented into distinct periods (first period for DL-TDoA, second and third periods for TWR) with separate session IDs allocated to each period. This segmentation allows independent management of different ranging protocols, improving measurement precision while organizing complexity through structured temporal separation.
Solution Approach 2:
The system dynamically allocates different session IDs for different periods and flexibly switches between DL-TDoA and TWR protocols based on operational requirements. This dynamic approach enables adaptive ranging that maintains high precision while managing complexity through flexible, context-dependent protocol selection.
2Productivity
If ranging rounds are organized in ranging blocks with multiple periods, then productivity is improved through efficient resource utilization, but loss of time increases due to extended service time management requirements
Solution Approach 1:
Ranging operations are organized into periodic ranging blocks with structured periods (first period for DL-TDoA, second and third periods for TWR). This periodic organization improves productivity by systematically utilizing ranging resources across multiple periods while managing time loss through predictable, repeating patterns that optimize resource allocation.
Solution Approach 2:
The ranging blocks maintain continuous useful action by seamlessly transitioning between different ranging protocols across periods. The structured multi-period approach ensures that ranging resources remain actively utilized throughout the service time, improving overall productivity while minimizing idle time through continuous operational phases.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances the efficient use of ranging resources and service time management in UWB systems, enabling accurate distance estimation and data transmission in IoT environments.
Implementation Method 1
the ToF may be used to calculate a distance between the gate and the mobile device based on a speed of light
Implementation Method 2
based on a speed of light
Implementation Method 3
exchanging at least one message for downlink time-difference-of-arrival (DL-TDoA) with a second UWB device
Implementation Method 4
receiving a first message for two-way ranging (TWR) from the second UWB device
Data Source
AI summary
A method of a first ultra-wide band (UWB) device according to an embodiment of the disclosure may comprise exchanging at least one message for downlink time-difference-of-arrival (DL-TDoA) with a second UWB device in a first period, receiving a first message for two-way ranging (TWR) from the second UWB device in a second period for a hybrid UWB session (HUS), and transmitting a second message for the TWR to the second UWB device in a third period for the HUS. A different session ID may be allocated to each of the second period and the third period for the HUS.