RF Transaction Time Reduction in ISO 14443 Type A Communication Devices
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Solution Overview
Problem
In passive communication modes, particularly in Type A of ISO/IEC 14443, the time required to enter a state for exchanging information at the application layer is significant due to the collision prevention procedure, leading to increased RF transaction times.
Innovation Solution
A communication device and method that includes an application selection unit to select applications hosted by a communication target device and an identification information acquisition unit to acquire identification information after application selection, utilizing a timeslot-based anticollision process with a predetermined SEL value, and optionally including a device detection unit to detect the presence of a communication target device before the anticollision process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a collision prevention procedure is performed in passive communication mode Type A, then communication reliability is improved, but RF transaction time increases
Solution Approach 1:
The patent applies preliminary action by performing application selection before the collision prevention procedure. The reader-writer transmits a command including application identification information to select an application hosted by the IC card before acquiring identification information, thereby reducing the time required to enter application layer information exchange state while maintaining communication reliability through the structured anticollision process
2Productivity
If application selection is performed before identification information acquisition, then communication efficiency is improved, but protocol complexity increases
Solution Approach 1:
The patent merges the application selection function with the existing anticollision procedure by transmitting application identification information as part of the command sent during the anticollision process. This integration allows application selection to occur concurrently with identification information acquisition, improving communication efficiency without significantly increasing protocol complexity as it utilizes existing command structures
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 reduces the overall RF transaction time by streamlining the application selection and identification process, enabling faster communication initiation.
Implementation Method 1
one communication device (an initiator) of a plurality of communication devices transmits data by outputting electromagnetic waves and modulating the electromagnetic waves
Implementation Method 2
The other communication devices (targets) of the plurality of communication devices transmit data by performing load modulation of the electromagnetic waves output by the initiator
Data Source
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AI summary
The present disclosure relates to a communication device and method capable of suppressing subjective quality deterioration at the time of a low bit rate. An application selection unit of an IC card selects an application hosted by a communication target device. Identification information of the communication target device is acquired after the application is selected. The present disclosure can be applied to, for example, a communication system.