Mobile Proximity Coupling Device Quality Indicator
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing mobile proximity coupling devices, such as smartphones and tablets, often experience suboptimal quality of inductive coupling with electronically readable objects like credit cards and identity cards, especially in shared field environments, making data exchange inefficient and unreliable.
Innovation Solution
A mobile proximity coupling device with a contactless interface and processor that determines the quality of inductive coupling by counting the number of responses to commands sent to the proximity object, using signal strength and characteristics to assess coupling quality and adjust the magnetic field activation intervals to optimize communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If mobile proximity coupling devices are used for inductive coupling with proximity objects, then portability and accessibility are improved, but the quality of coupling becomes non-optimal or insufficient for reliable data exchange
Solution Approach 1:
The system transmits training sequences from the mobile proximity coupling device to the proximity object and measures the received signal strength indicator (RSSI) and signal-to-noise ratio (SNR). Based on these measurements, the channel quality is determined and feedback is provided to adjust transmission parameters, ensuring reliable data exchange despite the mobile, portable configuration
Solution Approach 2:
The system dynamically adjusts transmission parameters including the number of training sequences, modulation order, and coding rate based on the determined channel quality. When coupling quality is poor, the system increases redundancy and reduces data rate to maintain reliability, while optimizing for speed when coupling quality is good
2Measurement precision
If training sequences are transmitted for channel estimation, then channel quality assessment is enabled, but the shared field environment between devices makes typical approaches hardly employable
Solution Approach 1:
The system transmits a specific number of training sequences (e.g., 4, 8, or 16 sequences) which is sufficient to achieve accurate channel estimation in the shared field environment without excessive overhead. This partial action approach balances measurement precision with communication efficiency
3Measurement precision
If the number of training sequences is increased to improve channel estimation accuracy, then coupling quality determination becomes more accurate, but communication overhead and time increase
Solution Approach 1:
The system dynamically adapts the number of training sequences based on the determined channel quality. In poor coupling conditions, more training sequences are transmitted to ensure accurate channel estimation. In good coupling conditions, fewer training sequences suffice, reducing overhead and time loss
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
This approach enables efficient and reliable data exchange by determining the quality of coupling and adjusting the position of the mobile device relative to the proximity object, ensuring a sufficient coupling quality for effective communication and data transfer.
Implementation Method 1
The mobile proximity coupling device 100 comprises a contactless interface 107 for inductive coupling denoted by the arrow 108 with the coupling interface 105 of the integrated circuit 101
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a mobile proximity coupling device (100) for inductive coupling with an integrated circuit of a proximity object, the integrated circuit comprising a coupling interface for inductive coupling, the proximity coupling device (100) comprising a contactless interface (107) being configured to inductively transmit a first number of commands towards the integrated circuit, and, after transmitting a respective command, to wait for a reception of a dedicated answer to the respective command from the integrated circuit within a predetermined time interval; and a processor (109) being configured to determine a quality indicator upon the basis of a second number of received dedicated answers to the first number of commands, the quality indicator indicating a quality of an inductive coupling between the contactless interface and the coupling interface of the integrated circuit.