Contactless Data Carrier Application Identification
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Solution Overview
Problem
Current contactless data carriers face challenges in managing multiple applications on a single device, leading to synchronization issues, collisions, and inefficient communication protocols, particularly when integrating applications with different communication parameters and file identifiers.
Innovation Solution
A method where each application on a portable data carrier generates a unique communication-readiness signal with a distinct identification number, allowing the reading device to selectively address and communicate with multiple applications independently, using a toggle functionality for concurrent or sequential communication, and managing logical channels to prevent data misassignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple applications share a single data carrier with common communication protocols, then device complexity is reduced, but communication reliability deteriorates due to synchronization issues and data collisions
Solution Approach 1:
The patent segments the identification space by assigning unique identification numbers to each application on the data carrier. This allows the reading device to distinguish between multiple applications without requiring complex synchronization protocols, thereby maintaining communication reliability while keeping the data carrier structure relatively simple.
Solution Approach 2:
The patent introduces an intermediary addressing mechanism where the reading device uses unique identification numbers as intermediaries to selectively address specific applications. This mediator layer prevents direct collisions between applications and eliminates the need for complex inter-application synchronization, resolving the reliability issue.
2Ease of operation
If applications use common file identifiers across different data carriers, then ease of operation is improved, but measurement precision deteriorates due to inability to distinguish data sources
Solution Approach 1:
The patent applies asymmetry by combining symmetric common file identifiers with asymmetric unique application identification numbers. The file identifier provides symmetric access simplicity, while the unique application ID introduces asymmetric differentiation to precisely identify the data source, resolving the contradiction between ease of operation and measurement precision.
3Productivity
If logical channels are used to address multiple applications, then productivity is improved, but device complexity increases due to channel management overhead
Solution Approach 1:
The patent changes the addressing parameter from complex logical channel identifiers to simple unique application identification numbers. This parameter change allows multiple applications to be addressed in parallel without the overhead of channel management, thereby improving productivity while reducing device complexity.
4Adaptability or versatility
If up to four applications are addressed via coded logical channels, then adaptability is improved, but manufacturing precision deteriorates due to limited addressing capacity
Solution Approach 1:
The patent adds another dimension to the addressing space by introducing unique application identification numbers that operate independently of the logical channel codes. This dimensional expansion allows virtually unlimited application addressing capacity without being constrained by the limited two-bit logical channel encoding, thereby improving manufacturing precision while maintaining adaptability.
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 parallel communication with multiple applications on a single data carrier without synchronization, prevents collisions, and allows for independent data structure management, supporting more than four applications and secure communication.
Implementation Method 1
The energy supply to the data carrier is normally effected here by the magnetic alternating field of a reading device
Implementation Method 2
when such a data carrier is brought into the response field of a reading device, thereby commencing its energy supply and putting it in an operational mode
Data Source
AI summary
A method and a data carrier for contactless communication of a reading device with at least two communication-ready applications located on a portable data carrier. A first communication-readiness signal is generated for a first application and sent to the reading device, the signal having a first identification number that is assigned to the first application and indicates to the reading device the communication readiness of said first application, and a second communication-readiness signal is generated and sent for a second application, the second signal having a second identification number different from the first identification number, which is assigned to said second application and indicates to the reading device the communication readiness of the second application. The identification numbers simulate for the reading device the communication readiness of a data carrier in each case. The reading device thus has the impression of communicating with applications of two separate data carriers.