Dual NFC Polling Loops for Wearable Authentication Power Reduction
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Solution Overview
Problem
Conventional NFC-enabled devices consume significant battery power due to repeated polling for authentication, which reduces battery life as they repeatedly search for and re-authenticate NFC tags.
Innovation Solution
Implementing two NFC polling loops: a primary loop for initial authentication scanning multiple tag types and a secondary loop for reduced power consumption scanning a smaller subset of tags after initial authentication, with a counter to tolerate missing-tag events and prevent unnecessary locking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If repeated polling is performed to discover and re-authenticate NFC tags, then authentication reliability is improved, but battery power consumption increases
Solution Approach 1:
The polling process is segmented into two distinct loops: a first polling loop for initial authentication that scans multiple NFC tag types, and a second polling loop for ongoing verification that scans a reduced subset of tag types. This segmentation allows the system to perform comprehensive authentication initially, then maintain security with reduced polling intensity, thereby resolving the contradiction between authentication reliability and power consumption.
Solution Approach 2:
The system dynamically adjusts polling behavior based on authentication state. During initial authentication, the first polling loop actively scans multiple tag types with higher frequency. After successful authentication, the system transitions to the second polling loop with reduced scanning activity. This dynamic adaptation maintains security requirements while optimizing power consumption during different operational phases.
2Measurement precision
If comprehensive polling of multiple NFC tag types is performed, then authentication accuracy is improved, but processing time increases
Solution Approach 1:
The authentication process is divided into two temporal phases with different scanning requirements. The first polling loop performs comprehensive scanning of multiple NFC tag types (Type 1, Type 2, Type 3, Type 4, and MIFARE Classic) to ensure accurate initial authentication. The second polling loop then performs verification with a smaller subset of tag types, reducing processing time for ongoing authentication while maintaining sufficient accuracy through the counter mechanism.
Solution Approach 2:
The system performs preliminary comprehensive scanning in the first polling loop to establish authentication status. By completing the thorough scan initially, the system eliminates the need for repeated comprehensive scans during subsequent verification, thereby reducing overall processing time while maintaining authentication accuracy through the established two-loop structure.
3Reliability
If frequent polling is performed to confirm authentication status, then security is improved, but battery life is reduced
Solution Approach 1:
The system implements periodic authentication verification through two polling loops with different frequencies. The first polling loop performs periodic comprehensive scans during initial authentication, while the second polling loop performs periodic verification scans with reduced frequency after authentication. This periodic action structure maintains security requirements while significantly reducing overall power consumption compared to continuous frequent polling, thereby extending battery life.
Solution Approach 2:
After successful authentication in the first polling loop, the system discards the more intensive scanning mode and recovers power by transitioning to the less intensive second polling loop. The authentication state is maintained through the counter mechanism, allowing the system to recover battery power while continuing to provide security verification through the reduced polling loop.
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
This approach significantly reduces battery power consumption by minimizing unnecessary polling, extending device usage time while maintaining secure authentication processes.
Implementation Method 1
Near Field Communications (NFC) is a short-range wireless communications technology standard that relies on inductive coupling of two devices to transfer information
Data Source
AI summary
Some battery-powered devices, such as smartphones, can be unlocked with use of wearable NFC (Near Field Communication) authentication devices. However, using conventional NFC authentication procedures is expensive in terms of power consumption because of continual rediscovery and reauthentication of the wearable authentication device. To address this, the present inventors, devised, among other things, more efficient methods for authenticating NFC-tagged authentication device, such as rings. For example, one embodiment uses two NFC polling loops or structures, instead of one as conventionally done. The first loop, used for initial authentication, entails scanning for two or more types of NFC tags. And the second loop, invoked after initial authentication, scans for a smaller subset of the two or more types to conserve battery power.