Communications System Dynamic Service Permission Level Control
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Solution Overview
Problem
Noncontact communication systems, particularly those using reflected-wave transmission, face challenges in ensuring data security due to the vulnerability of wireless communication to interception, especially when transmitting value information, while also needing to maintain user friendliness by controlling the communication distance.
Innovation Solution
A communications system that includes a service permission level notifier and an access controller to determine the accessibility of the transponder based on the received signal level, allowing the reader/writer to set a service permission level according to the application, thereby controlling the communicable area and preventing interception by nearby terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the communication distance is extended to improve user friendliness, then the communicable area is enlarged, but the risk of interception by nearby terminals increases
Solution Approach 1:
The system dynamically changes the service permission level parameter based on the received signal level. When a terminal is detected at a nearby position (high signal level), the service permission level is raised to restrict access. When terminals are at normal communication distances (lower signal level), the service permission level is lowered to allow communication. This parameter change resolves the contradiction by adapting the security level to the detected communication environment.
2Object-affected harmful factors
If the service permission level is raised to prevent interception, then data security is improved, but the communicable area is reduced
Solution Approach 1:
The service permission level is made dynamic rather than fixed. The reader/writer continuously monitors the received signal level and adjusts the service permission level in real-time. This dynamic adjustment allows the system to maintain high security (high service permission level) only when nearby terminals are detected, while allowing broader communication (low service permission level) when no interception risk is present, thus resolving the area-security contradiction.
Solution Approach 2:
The system changes the service permission level parameter based on detected signal conditions. By raising the service permission level only when high signal levels indicate nearby terminals, the system maintains data security without permanently restricting the communicable area. This conditional parameter change allows the communicable area to remain large under normal conditions while providing security protection when needed.
3Object-affected harmful factors
If the received signal level threshold is increased to limit communicable area, then security is improved, but the maximum communication distance is reduced
Solution Approach 1:
The received signal level threshold is made dynamic and adaptive. Rather than using a fixed threshold that would permanently limit communication distance, the system adjusts the threshold based on the service permission level. When the service permission level is high (security mode), the effective threshold increases to prevent distant communication. When the service permission level is low (normal mode), the threshold decreases to allow maximum communication distance. This dynamic threshold adjustment resolves the contradiction between security and communication range.
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
The system effectively enhances user friendliness by allowing longer communication distances for secure applications while securing data transmission by limiting the communicable area for applications requiring high security, thus balancing user convenience and data protection.
Implementation Method 1
the transponder has a reflector configured to transmit data by a reflected wave obtained by modulating a non-modulated carrier
Implementation Method 2
The noncontact communications methods based on the RFID include electrostatic coupling, electromagnetic induction, and radio communicating
Data Source
AI summary
A communications system configured to execute data transmission between a transponder having no radio wave generating source thereof and a reader/writer is provided. The communications system includes, a service permission level notifier configured to tell a service permission level for associated with a received signal level for permitting service acceptance from the reader/writer to the transponder, and an access controller configured to determine in the transponder whether the received signal level from the reader/writer is at the notified service permission level to determine accessibility to the transponder from the reader/writer.