UWB Anchor ON/OFF Timing for Failed Ranging Sessions
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Solution Overview
Problem
Ultra-wideband (UWB) anchors in smart key systems experience unnecessary power consumption due to continuous signal-reception standby mode when failing to receive signals, leading to degradation of ranging performance.
Innovation Solution
Implementing a UWB ON/OFF operation method where the UWB anchor enters a non-standby mode after a threshold number of consecutive failures, and re-enters standby mode after a predetermined UWB OFF time, set longer than the standby mode, to minimize power consumption and maintain ranging performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UWB anchor keeps the reception window open continuously to ensure signal reception, then the ranging reliability is improved, but the power consumption increases unnecessarily
Solution Approach 1:
The UWB anchor switches between standby mode and non-standby mode periodically based on ranging success/failure patterns. When consecutive failures reach a threshold, the anchor enters non-standby mode to save power, then returns to standby mode after a predetermined time. This periodic switching resolves the contradiction by making the reception window operation conditional rather than continuous.
2Use of energy by moving object
If the UWB anchor enters non-standby mode to reduce power consumption, then the power usage is optimized, but the ranging performance may degrade due to missed signals
Solution Approach 1:
The system uses feedback from ranging results to control the standby mode. When ranging failures occur consecutively and reach a threshold number, the anchor receives feedback to switch to non-standby mode. After a predetermined time in non-standby mode, it receives feedback to return to standby mode. This feedback mechanism ensures the anchor only enters power-saving mode when necessary, preventing performance degradation while optimizing power consumption.
3Measurement precision
If the UWB anchor maintains continuous reception standby to ensure accurate ranging, then the measurement precision is improved, but unnecessary power consumption occurs when signals are not received
Solution Approach 1:
The reception window operation is made dynamic rather than static. The anchor adapts its reception state based on real-time ranging conditions, switching between standby and non-standby modes. This dynamic adjustment allows the system to maintain high ranging accuracy when signals are present while avoiding unnecessary power consumption when signals are absent, resolving the contradiction between measurement precision and energy loss.
Data Source
AI summary
An ultra-wideband (UWB) anchor using a UWB ON/OFF operation method to minimize power consumption. The UWB anchor includes a power supply to supply power to the UWB anchor, a transceiver to transmit/receive a UWB signal to and from a UWB tag for performing ranging, and to transmit a reception failure when failing to receive the UWB signal from the UWB tag, and a controller to receive the reception failure from the transceiver and to end a ranging session when a cumulative sum of ranging failures for each ranging block reaches a maximum number of failed ranging round attempts.