NFC Device Battery-Off Mode Read-Only Application Execution
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Solution Overview
Problem
Near Field Communication (NFC) devices face challenges in supporting applications that require high power levels when in battery-off or battery-low mode, as they may not have enough energy to execute write-only or read/write applications due to limited power harvesting from magnetic fields.
Innovation Solution
The implementation of a system and method that determines which NFC applications can be supported in battery-off mode by using a separate nonvolatile memory and an application identifier table with a battery-off flag or power code, allowing only read-only applications to be executed without requiring secure memory writing, thereby enabling NFC device functionality even when the host device has no battery power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the NFC device attempts to execute write-only or read/write applications in battery-off mode, then the device can provide full application functionality, but the device will not have sufficient power to complete the operations due to limited power harvesting
Solution Approach 1:
The NFC device dynamically adjusts its operational capabilities based on available power levels. The system monitors power availability and adaptively selects which applications can be executed, transitioning between different functional states (read-only mode vs. full functionality) depending on whether sufficient power is present to support write operations.
Solution Approach 2:
The system changes the operational parameters of the NFC device by modifying the set of executable applications based on power conditions. When power is insufficient, the device changes from supporting all application types to supporting only read-only applications, effectively altering its functional parameters to match available energy resources.
2Adaptability or versatility
If the NFC device supports multiple applications including write-only applications, then the device provides comprehensive service capability, but the device cannot determine which applications can be supported when power is limited
Solution Approach 1:
The system performs preliminary classification of applications into categories (read-only, write-only, read/write) and stores this information in advance. When power limitations are detected, the device can immediately determine which applications are executable based on pre-stored power requirement data, avoiding complex real-time analysis of each application's power needs.
3Use of energy by moving object
If the NFC device executes read-only applications in battery-off mode, then the device maintains essential functionality with low power consumption, but the device cannot perform write operations to memory
Solution Approach 1:
The NFC device performs a partial version of application functionality by executing only the read-only portions of applications when power is limited. Instead of attempting to run complete applications that may require write operations, the system runs simplified versions that provide essential services without requiring full power availability.
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 solution allows NFC devices to execute lower-power applications in battery-off mode, ensuring continued functionality for read-only operations while preventing the execution of power-intensive write-only applications, thereby maintaining essential NFC services without draining the host device's battery.
Implementation Method 1
Under certain circumstances, a NFC device may have to derive power from the magnetic field of another NFC device
Implementation Method 2
a first NFC device transmits or generates a magnetic field modulated with the information. This magnetic field inductively couples the information onto a second NFC device
Data Source
AI summary
Embodiments of the present invention provide systems and methods for NFC secure application support when an NFC device is executing in a battery-off or battery-low mode. In such a case, the NFC device may have enough power to execute some applications (e.g., read-only applications) but not enough power to execute others (e.g., applications that require data to be written). Embodiments of the present invention enable these lower-power applications to be executed by the NFC device even when a host communications device has no battery power.