NFC Range Limitation for Secure Data Exchange
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Solution Overview
Problem
In near field communication systems, efficiently restricting data transmission and reception with specific communication partners while maintaining links with multiple partners is challenging, particularly when quick processing is required or to prevent false recognition and information leakage.
Innovation Solution
A communication apparatus with first and second near field communication units, a detection unit, and a communication control unit that restricts data transmission and reception with partners outside a detected narrower communicable range while maintaining links, and switches power modes to conserve energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If links are maintained with multiple communication partners, then communication efficiency is improved, but the risk of information leakage and false recognition increases
Solution Approach 1:
The patent divides the communication range into two segments: a first communicable range for link establishment and a second narrower communicable range for active communication. By segmenting the communication space, the system can maintain links with multiple partners in the first range while restricting actual data transmission to only those within the second range, thus preventing information leakage while maintaining communication efficiency.
Solution Approach 2:
The patent introduces a range detection mechanism as an intermediary between link establishment and data transmission. This intermediary verifies whether communication partners are within the appropriate range before allowing data exchange, acting as a gatekeeper that prevents unauthorized communication and information leakage while maintaining the efficiency of pre-established links.
2Reliability
If communication is restricted to specific partners, then information security is improved, but communication flexibility and speed deteriorate
Solution Approach 1:
The patent performs preliminary link establishment with multiple communication partners before actual communication occurs. By pre-establishing links in advance, the system ensures that when communication is needed, partners are already authenticated and ready, eliminating the need for repeated authentication procedures and maintaining communication flexibility while ensuring security through pre-verified connections.
Solution Approach 2:
The patent implements dynamic range detection that continuously monitors the positions of communication partners. The system adapts communication restrictions in real-time based on detected positions, allowing flexible communication with partners who enter the appropriate range while automatically restricting communication with those outside the range, thus maintaining both security and flexibility.
3Measurement precision
If active monitoring of communication partners is performed, then communication precision is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic range detection instead of continuous monitoring. The detection unit checks whether communication partners are within the second communicable range at specific intervals rather than constantly, which maintains adequate detection accuracy for communication purposes while significantly reducing power consumption compared to continuous monitoring.
Solution Approach 2:
The patent applies different detection qualities to different communication scenarios. The system uses a first communicable range for link establishment and a second, more precisely defined communicable range for active communication. By applying precise detection only where necessary (within the second range) rather than uniformly across all ranges, the system achieves necessary detection accuracy while minimizing power consumption.
Data Source
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AI summary
This communication apparatus C is provided with: a first communication unit which, after establishing a link necessary for first near field communication with a communication counterpart existing within a first communication available range, performs the first near field communication with the link-established communication counterpart; and a second communication unit which performs second near field communication with a communication counterpart existing within a second communication available range that is narrower than the first communication available range. And when it is detected that any one among a plurality of communication counterparts with which links are established has entered the second communication available range, the communication apparatus C limits the transmission and reception of data through the first near field communication with communication counterparts other than the communication counterpart detected to have entered the second communication available range, while maintaining the establishment of each link with each of the plurality of link-established communication counterparts.