NFC Fragmentation Termination Message Handling
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Solution Overview
Problem
In NFC devices, event messages during message transmission are often misinterpreted as message fragments, leading to mismatches between the RF unit's state and the internal state of the device, causing processing errors due to the lack of accurate recognition of event messages within fragmented message transmissions.
Innovation Solution
A communication device with fragmentation and termination message mechanisms that ensures accurate transmission by adding flag information to message fragments and using termination messages to distinguish event messages from regular fragments, thereby preventing misinterpretation and maintaining correct device processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If message fragments are transmitted sequentially during short-range radio communication, then data transmission capability is improved, but event messages may be misinterpreted as message fragments causing processing errors
Solution Approach 1:
The patent segments the message transmission process into distinct types: regular message fragments and termination messages. By introducing a specific termination message structure that differs from regular message fragments, the system can reliably distinguish between the two types. The termination message includes specific flag information and structure that allows the receiving end to identify when regular message transmission has concluded and event messages should be processed separately.
Solution Approach 2:
The patent applies local quality by giving different characteristics to different types of messages. Termination messages have specific local qualities (different flag bits, structure markers) that distinguish them from regular message fragments. This local differentiation allows the receiving end to correctly identify and process event messages without confusion, resolving the misinterpretation issue while maintaining efficient sequential transmission.
2Speed
If event messages are transmitted during message fragment transmission, then real-time event notification is improved, but state mismatch occurs between RF unit and internal device state
Solution Approach 1:
The patent implements preliminary action by transmitting termination messages before event messages during the message fragment transmission process. This preliminary termination signal prepares the receiving end by clearly marking the end of regular message transmission, ensuring that subsequent event messages are processed with the correct state context. This prevents state mismatch by ensuring the internal state is properly updated before event notification.
Solution Approach 2:
The system uses feedback mechanisms through termination messages that provide explicit confirmation to the receiving end that message fragment transmission has concluded. This feedback loop ensures state consistency by allowing the receiving end to properly synchronize its internal state with the RF unit's state before processing event messages, thus maintaining stability while enabling real-time notification.
3Device complexity
If message fragments are transmitted without termination markers, then transmission simplicity is improved, but reception side cannot accurately distinguish event messages from fragments
Solution Approach 1:
The patent extracts the essential identification information needed to distinguish termination messages from regular message fragments. By incorporating specific flag bits and structural markers into termination messages, the system extracts the necessary differentiation without requiring complex transmission protocols. This selective extraction maintains simplicity while providing sufficient information for accurate event message identification.
Solution Approach 2:
The patent uses analogies to color changes by introducing distinct visual markers (flag bits, structure markers) that change the 'appearance' of termination messages compared to regular message fragments. These markers act like color changes that allow the receiving end to easily distinguish between message types without adding significant complexity to the transmission protocol, thus preventing information loss while maintaining simplicity.
Data Source
AI summary
A communication device includes: a communication unit executing short-range radio communication with another device; a control unit controlling the short-range radio communication executed by the communication unit; a first fragmenting unit fragmenting a message transmitted from the communication unit to the control unit so as to have a predetermined size; a first message fragment transmission unit sequentially transmitting a plurality of message fragments obtained by fragmenting the message by the first fragmenting unit to the control unit; and a first termination message transmission unit transmitting a termination message, which is a message used to terminate the message fragments being transmitted by the first message fragment transmission unit, before another message when the another message is transmitted during the transmission of the plurality of message fragments from the communication unit to the control unit.