Adaptive Approach Intent Detection for Low-Power Vehicle Ranging
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Solution Overview
Problem
The Car Connectivity Consortium (CCC) Specification requires high-rate pulse (HRP) secure ranging for vehicle access, which consumes excessive power in key FOBs, posing battery life concerns for vehicles.
Innovation Solution
Implementing out-of-band negotiations to determine whether the initiator device is a smartphone or a key FOB, optimizing power consumption by adapting algorithms to conserve battery life in key FOBs without compromising user experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HRP secure ranging is implemented in key FOB, then vehicle access security is improved, but battery life deteriorates
Solution Approach 1:
The system dynamically adapts the ranging protocol based on device characteristics. Smartphones use HRP secure ranging for high security requirements, while key FOBs use LRP secure ranging to conserve battery power. The system adjusts the security protocol in real-time based on the initiator device type, resolving the contradiction between security and battery life.
Solution Approach 2:
The patent changes the ranging parameters (pulse rate, power level) based on the initiator device characteristics. For key FOBs, LRP parameters are used with lower power consumption, while smartphones use HRP parameters with higher security. This parameter adaptation allows the system to maintain appropriate security levels while optimizing battery life for each device type.
2Reliability
If HRP secure ranging is used for all devices, then security confidence is improved, but power consumption increases
Solution Approach 1:
Different security protocols are applied to different device types based on their local characteristics. Smartphones with larger batteries receive HRP secure ranging for high security confidence, while key FOBs with small batteries receive LRP secure ranging for acceptable security with lower power consumption. Each device receives the appropriate security level for its specific context.
Solution Approach 2:
The system dynamically selects the ranging protocol based on real-time device identification. When a key FOB is detected as the initiator, the system switches to LRP mode; when a smartphone is detected, it uses HRP mode. This dynamic adaptation ensures optimal security confidence matched to each device's power capabilities.
3Use of energy by moving object
If out-of-band negotiations are implemented to identify device type, then power optimization is improved, but device complexity increases
Solution Approach 1:
The system performs device type identification and protocol selection in advance, before the actual ranging operation begins. The out-of-band negotiation happens preliminarily to establish whether the initiator is a smartphone or key FOB, allowing the appropriate power optimization strategy to be selected beforehand. This preliminary classification simplifies the main ranging operation.
Solution Approach 2:
The out-of-band negotiation channel serves as an intermediary mechanism to exchange device capability information without affecting the main ranging protocol. This separate communication channel allows complex device identification and power optimization decisions to be made without adding complexity to the core secure ranging functionality.
Data Source
AI summary
A responder device, including: a wireless module operable to receive a wireless signal from an initiator device; and processor circuitry coupled to the wireless module and operable to: monitor a distance between the responder device and the initiator device based on the wireless signal; determine an approach intent probability for the initiator device using an algorithm that is based on the distance between the responder device and the initiator device and is adaptive according to characteristic information of the initiator device; and initiate a secure ranging session with the initiator device when the approach intent probability exceeds a predetermined approach intent probability threshold.