NFC Front End Target Selection Logic for Multi-Response Systems
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Solution Overview
Problem
Existing NFC devices face challenges in quickly establishing communication without implementing a special circuit, particularly when the number of time slots is insufficient for multi-response systems, leading to reduced correctness rates in target selection.
Innovation Solution
A communication device and method that selects a predetermined target for near-field communication, broadcasting polling commands to other targets, and confirming the target based on identifier matching, allowing for quick communication establishment without a special circuit, using a front end that selects a target once every two times as a transmission destination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-response system is implemented to increase target correctness rate, then the correctness rate is improved, but a special circuit must be provided in the front end which complicates the implementation
Solution Approach 1:
The patent extracts the multi-response functionality from requiring a special circuit by implementing it through software control in the front end. The front end selectively transmits polling commands to different targets based on time slot information, achieving multi-response capability without dedicated hardware circuits for simultaneous response handling.
Solution Approach 2:
The front end acts as an intermediary that manages the communication between the reader and multiple targets. It receives polling commands, determines which target should respond based on time slot information, and selectively forwards the polling command to the appropriate target, eliminating the need for special response multiplication circuits.
2Device complexity
If the number of time slots is limited, then the device complexity is reduced, but not all polling responses can be sent back simultaneously
Solution Approach 1:
The front end dynamically adjusts its polling command transmission strategy based on the available time slots and target requirements. It selectively transmits polling commands to different targets at different time slots, optimizing the use of limited time resources to maximize the number of responses that can be transmitted back to the reader.
3Device complexity
If a single-response system is used to simplify implementation, then the device complexity is reduced, but the target correctness rate is reduced
Solution Approach 1:
The front end is designed to perform multiple functions: it can operate in single-response mode for simplicity or switch to multi-response mode for higher correctness rates. By implementing both modes through software control rather than hardware circuits, the system achieves universality and can adapt to different operational requirements without requiring separate dedicated circuits for each mode.
Data Source
AI summary
A communication device, includes targets that each execute predetermined processing; and a front end that selects, from the targets, a confirmed target with which an external device is to communicate and that performs near-field communication with the external device. During transmission of a command for selecting at least one candidate of the confirmed target, the front end selects a predetermined one of the targets once every two times as a transmission destination of the command.