Communication Device Handover Mechanism for Continuous Data Transfer
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Solution Overview
Problem
Existing communication systems, such as NFC, are not suitable for transferring large-volume data due to low communication rates, and require handover to higher rate modes like wireless LAN or Bluetooth, which disrupts data transfer when the media card is moved away from the reader/writer.
Innovation Solution
A communication device and system that incorporate a secure communication unit for close-proximity communication, a high-speed communication unit for faster data transfer, and a secondary battery-powered unit to maintain communication when the high-speed link is disconnected, allowing continuous data transfer even when the device and reader/writer are moved apart.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high-speed close-proximity communication (TransferJet) is used for rapid data transfer, then communication speed is improved, but communication is interrupted when the media card is moved away from the reader/writer
Solution Approach 1:
The patent introduces a handover mechanism where NFC acts as an intermediary to bridge TransferJet and wireless LAN communications. When TransferJet communication is interrupted, the system uses NFC for mutual authentication and then handovers to wireless LAN, ensuring continuous data transfer without interruption.
Solution Approach 2:
The system dynamically switches between different communication modes (TransferJet, NFC, wireless LAN) based on the proximity and communication status. The communication path is not fixed but adapts in real-time, allowing the system to maintain high-speed transfer when possible and switch to alternative modes when needed.
2Reliability
If handover to wireless LAN or Bluetooth is performed to maintain communication when moved away, then communication continuity is improved, but data transfer speed decreases
Solution Approach 1:
The patent segments the communication process into distinct phases: mutual authentication phase (using NFC), high-speed data transfer phase (using TransferJet), and continuous communication phase (using wireless LAN). Each phase uses the most appropriate communication mode for its specific requirements, optimizing both speed and continuity.
Solution Approach 2:
The system performs preliminary mutual authentication using NFC before switching to high-speed TransferJet communication. This preliminary action establishes secure communication credentials that enable subsequent high-speed data transfer without requiring continuous close-proximity contact.
3Reliability
If NFC mutual authentication is performed to identify communication parties, then security is improved, but communication rate is limited to several hundred kbps
Solution Approach 1:
The system uses NFC for periodic mutual authentication to verify communication parties, then switches to high-speed TransferJet for actual data transfer. The authentication is performed periodically or at transition points rather than continuously, maintaining security while enabling high-speed communication during data transfer phases.
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 continuous data transfer between a mobile communication device and a reader/writer device, even when they are separated, by switching to a different communication mode and using stored power, ensuring uninterrupted data transfer.
Implementation Method 1
a power transmission unit configured to receive power transmitted from the reader-writer device by power transmission
Data Source
AI summary
There is provided a communication device including a secure communication unit configured to perform secure communication with an external reader/writer device, the secure communication being secure close-proximity communication, a first communication unit configured to perform high-speed communication with the reader/writer device, the high-speed communication being close-proximity communication that is faster than the secure communication, a second communication unit configured to, when communication via the high-speed communication is disconnected, communicate with the reader/writer device with a communication mode that is different from a communication mode of the high-speed communication, a power transmission unit configured to receive power transmitted from the reader-writer device by power transmission, and a secondary battery configured to store the power received by the power transmission unit. The second communication unit may be configured to, when communication via the high-speed communication is disconnected, operate with the power stored in the secondary battery.