NFC Transmission Delay Circuit for Collision Avoidance
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Solution Overview
Problem
The proliferation of NFC circuits in mobile devices leads to time overlapping collisions, which interfere with or prevent communication between user equipment and targeted NFC circuits, due to the close proximity of NFC circuits and their simultaneous transmissions.
Innovation Solution
An NFC circuit with a transmission delay circuit that controls the transceiver to delay data transmission until a defined delay time after powering on, set based on signals from other NFC circuits, to avoid collisions and ensure reliable communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If NFC circuits transmit data immediately upon powering on, then the response speed is improved, but transmission collisions occur with nearby NFC circuits
Solution Approach 1:
The transmission delay circuit introduces a controllable delay period between power-on and data transmission. This preliminary action allows the NFC circuit to wait until the transmission channel is clear before sending data, preventing collisions while maintaining eventual responsiveness.
Solution Approach 2:
The transmission delay time is made dynamically adjustable based on detected conditions. The system monitors for presence of other NFC circuits and automatically adjusts the delay duration to optimize collision avoidance while minimizing transmission wait time.
2Reliability
If a fixed transmission delay time is used, then transmission collisions are reduced, but the transmission time is increased
Solution Approach 1:
The transmission delay time transitions from fixed to dynamic based on detected conditions. When no other NFC circuits are detected, the delay is minimized or eliminated. When collisions are detected, the delay is extended to avoid conflicts, thus optimizing the trade-off between reliability and time loss.
Solution Approach 2:
The system continuously monitors the NFC environment for presence of other transmitting circuits and uses this feedback to adjust the transmission delay accordingly. This closed-loop control ensures optimal timing that adapts to real-time conditions.
3Reliability
If the transmission delay time is extended to avoid collisions, then transmission reliability is improved, but the productivity is reduced
Solution Approach 1:
The delay time is dynamically adjusted based on actual collision conditions. In collision-free environments, minimal delay maintains high productivity. When collisions occur, extended delay ensures reliability. This dynamic adaptation optimizes the productivity-reliability trade-off.
Solution Approach 2:
The transmission delay parameter is changed based on detected environmental conditions. The system modifies this critical parameter in response to presence/absence of other NFC circuits, allowing optimal balance between communication efficiency and collision avoidance.
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 solution effectively reduces transmission collisions by controlling the timing of NFC data transmission, enhancing the ability of user equipment to communicate with targeted NFC circuits without interference.
Implementation Method 1
The antenna is configured to inductively couple to signals emitted by a second NFC circuit
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
A first near field communication (NFC) circuit includes an antenna, a charging circuit, a transceiver circuit, and a transmission delay circuit. The antenna is configured to inductively couple to signals emitted by a second NFC circuit. The charging circuit is configured to output power provided by the inductive coupling through the antenna to the signals emitted by the second NFC circuit. The transceiver circuit is configured to be powered by the charging circuit to transmit data for receipt by the second NFC circuit. The transmission delay circuit is configured to be powered by the charging circuit and control the transceiver circuit to delay transmission of the data until expiration of a defined delay time after the transceiver circuit has become sufficiently powered on to operate to transmit the data. Related accessories for user equipment, user equipment, and methods are disclosed.