Vehicle Digital Key UWB Authentication Timing for Pre-Derived URSK
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Solution Overview
Problem
In UWB-based digital key systems, the generation of a pre-derived URSK is often delayed due to interference with location authentication of an active URSK, leading to potential delays or cancellations in vehicle operations such as starting or locking/unlocking the vehicle.
Innovation Solution
A method and system for generating a pre-derived URSK based on the ranging result of a digital key, where the time point of generation is determined according to the first to third locations of the digital key, ensuring that the generation of the pre-derived URSK does not interfere with the location authentication of the active URSK.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a pre-derived URSK is generated during location authentication of an active URSK, then the pre-derived URSK is created for future use, but operation delays occur due to simultaneous occupation of the Secure Element
Solution Approach 1:
The patent applies preliminary action by generating the pre-derived URSK in advance during the current ranging session, specifically during location authentication when the vehicle controller already has access to the Secure Element. This allows the pre-derived key to be ready before the next ranging session begins, eliminating future delays without requiring simultaneous Secure Element access.
Solution Approach 2:
The patent maintains continuity of useful action by utilizing the Secure Element access during location authentication to generate the pre-derived URSK. Instead of leaving the Secure Element idle after authentication, the system continues to perform the key generation task during the same operational window, ensuring uninterrupted productivity.
2Productivity
If pre-derived URSK generation is performed regularly during ranging, then future ranging sessions are prepared, but location authentication may be delayed due to Secure Element occupation
Solution Approach 1:
The patent performs the pre-derived URSK generation as a preliminary action during the current ranging session's location authentication phase. This ensures that the next ranging session will be prepared in advance, improving productivity while maintaining reliability by not creating simultaneous access conflicts.
3Duration of action of moving object
If the Secure Element is occupied for pre-derived URSK generation, then future authentication is prepared, but current authentication may exceed waiting time and be canceled
Solution Approach 1:
The patent implements preliminary action by completing the pre-derived URSK generation during the current location authentication operation. This timing strategy ensures that the pre-derived key is ready before the next ranging session without extending the current authentication beyond the user's waiting time threshold, thus avoiding cancellation.
Data Source
AI summary
A method is configured to generate a pre-derived ultra wide band (UWB) ranging secure key (URSK) according to the ranging result of a digital key, and a digital key authentication controller for a vehicle is configured to authenticate the URSK. The method for generating the pre-derived URSK includes steps of: determining a location of the digital key in relation to the vehicle according to a UWB ranging; determining a time of generating the pre-derived URSK according to the locations of the digital key; and generating the pre-derived URSK according to the time. The method may determine generation of the pre-derived URSK that is not interfered with the authentication of an active URSK according to the ranging result of the digital key, and may control the time of generating each pre-derived URSK according to first to third locations.