RFID Transponder Tamper Status Communication via Logical Memory Views
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Solution Overview
Problem
Existing RFID transponders with tamper loop functionality require regular application updates and multiple applications on readers to provide tamper loop status, which is inefficient and inconvenient.
Innovation Solution
A method for a passive RFID transponder to communicate the tamper loop status to a reader using a first communication protocol, with a dual-memory system where one memory stores data for the first protocol and another for a second protocol, allowing selection of a logical view based on binary parameters representing the tamper loop status, enabling direct communication without the need for external applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an application based on NFC protocol is used to provide tamper loop status to a reader, then the tamper status can be communicated to the reader, but the application needs to be regularly updated and maintained
Solution Approach 1:
The transponder autonomously manages its own tamper status communication by internally selecting and providing the appropriate logical view of its memory based on its tamper loop state. The transponder serves itself by automatically determining which portion of its user memory to expose without requiring external application logic to interpret or request specific status information.
Solution Approach 2:
The transponder's memory system is designed to serve multiple functions: it stores both product information and tamper status information in the same user memory, and can dynamically present different logical views (intact or broken state) through a single standardized interface, eliminating the need for separate applications for different functions.
2Adaptability or versatility
If different applications are installed on the reader to check tamper status of different products, then product-specific tamper checking is enabled, but the reader requires multiple applications
Solution Approach 1:
A single reader application can universally check tamper status across different products because each transponder independently manages its own tamper status representation in standardized memory portions. The reader application simply requests the user memory and receives the appropriate logical view without needing product-specific logic.
Solution Approach 2:
The transponder changes its memory presentation parameters dynamically based on its tamper loop state. By altering which logical view of the user memory is provided (intact vs. broken state), the transponder adapts to different product types and scenarios without requiring the reader to change its application behavior.
3Reliability
If the user memory contains two portions for tamper loop status, then both intact and broken states can be stored, but the reader cannot directly access the relevant portion without application logic
Solution Approach 1:
The transponder automatically determines and provides the relevant logical view of its memory based on its internal tamper loop state. When a reader requests the user memory, the transponder autonomously selects which portion (intact or broken state) to expose, eliminating the need for the reader to implement logic to determine which memory portion is relevant.
Solution Approach 2:
The transponder acts as an intermediary between its dual-portion memory and the reader. It mediates the access by selectively exposing only the relevant logical view of the memory contents based on its tamper state, filtering and presenting information in a reader-friendly format without requiring the reader to directly navigate or interpret the underlying memory structure.
Data Source
AI summary
A method provides a tamper loop status of a radio-frequency transponder to a reader. The transponder communicates with the reader at a first frequency according to a first communication protocol. The transponder includes a first non-volatile memory for storing a first set of data of the first communication protocol. The first memory includes a user memory having two portions and each portion includes a data item specific to a status of the tamper loop. The method is performed by the transponder after receiving a request according to the first protocol to read the user memory and includes generating a logical view of the user memory, the logical view including only one of the two portions that is selected according to a value of a binary parameter representative of a status of the tamper loop. The method also includes providing the logical view to the reader via the first protocol.