Passive NFC Device Persistent Flag Segmentation
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Solution Overview
Problem
NFC Forum Type 5 tags, which use the ISO/IEC 15693 protocol, lack the capability to support web-based authentication due to insufficient time for updating non-volatile memory, whereas NFC Forum Type 2 tags using the ISO/IEC 14443 protocol can support it, but with different timing requirements, creating a gap in communication protocols for autonomous updates.
Innovation Solution
A method involving a passive NFC device with a near field communication controller and transceiver, utilizing persistent flags to split logical operations into sub-tasks, allowing updates during polling requests based on varying communication protocol timeouts, enabling web-based authentication on NFC Forum Type 5 tags.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If NFC Forum Type 5 tags use the ISO/IEC 15693 protocol, then communication compatibility is improved, but web-based authentication capability deteriorates due to insufficient power-up time for memory updates
Solution Approach 1:
The patent segments the authentication process into two distinct phases: a first phase using ISO/IEC 15693 protocol for initial communication and tag identification, and a second phase using ISO/IEC 14443 protocol for web-based authentication requiring memory updates. This segmentation allows each protocol to be used for its strengths while avoiding the limitations of either protocol alone.
Solution Approach 2:
The patent introduces an intermediary mechanism - a timeout period during polling requests - that provides sufficient time for the NFC tag to perform autonomous updates in non-volatile memory before authentication occurs. This intermediary timeout acts as a buffer that reconciles the conflicting timing requirements of the two protocols.
2Reliability
If the power-up time for ISO/IEC 15693 protocol is extended to allow memory updates, then web-based authentication capability is improved, but communication timing compatibility deteriorates
Solution Approach 1:
The patent dynamically adjusts the timeout period based on the detected protocol type. When ISO/IEC 15693 protocol is detected, a first timeout value is used; when ISO/IEC 14443 protocol is detected, a second timeout value is used. This dynamic adjustment allows the system to optimize timing for each protocol while maintaining overall compatibility.
Solution Approach 2:
The patent changes the timeout parameter depending on the communication protocol being used. By modifying this temporal parameter, the system can accommodate the different timing requirements of ISO/IEC 15693 and ISO/IEC 14443 protocols, enabling both short-range communication and web-based authentication to function properly.
3Reliability
If a dedicated App is used to interact with the NFC tag, then communication reliability is improved, but ease of operation deteriorates
Solution Approach 1:
The patent implements self-service functionality where the NFC tag autonomously performs counter value updates in non-volatile memory during the timeout period without requiring active intervention from a mobile application. The tag automatically prepares the dynamic NDEF message with updated authentication credentials, eliminating the need for dedicated Apps to manage security credentials.
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
Enables web-based authentication on NFC Forum Type 5 tags by allowing autonomous updates within the limited power-up time, leveraging persistent flags to manage sub-tasks across different communication protocol timeouts, thus bridging the protocol gap and enhancing communication efficiency.
Implementation Method 1
NFC technology is commonly used for contactless short-range communications based on radio frequency identification (RFID) standards, using magnetic field induction to enable communication between electronic devices
Implementation Method 2
Some mobile devices incorporate contactless card technology and/or near field communication (NFC) chips
Data Source
AI summary
The present disclosure relates to a NFC communication system, to a method of establishing communication between a wireless communication device and a passive NFC device and to a passive NFC device. The passive NFC device includes an NFC controller, an NFC transceiver coupled with the NFC controller, and at least one persistent flag coupled with the NFC controller, the persistent flag being switchable between an activated state and a deactivated state. The NFC controller is configured to perform a logical operation being divisible into a sequence of at least a first subtask and a second subtask and the NFC controller is configured to ascertain the status of the persistent flag. The NFC controller is further configured to selectively perform at least one of the first subtask and the second subtask on the basis of the status of the persistent flag.