Bluetooth OOB Pairing Using NFC Clock Data Exchange
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Solution Overview
Problem
Current out-of-band (OOB) Bluetooth pairing methods using Near Field Communication (NFC) often result in prolonged connection times, sometimes exceeding several seconds, due to the exchange of only the target Bluetooth MAC address, which can lead to timed-out pairings and inefficiencies.
Innovation Solution
The system employs an additional communication path to exchange clock data between Bluetooth transceivers, allowing the second Bluetooth transceiver to adjust its paging sequence based on the received clock data, thereby reducing pairing times by predicting the target device's scanning frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only Bluetooth MAC address is exchanged via NFC for OOB pairing, then the pairing process is simplified, but the connection time is prolonged exceeding several seconds
Solution Approach 1:
The patent applies preliminary action by exchanging Bluetooth clock data via NFC before the actual Bluetooth connection is established. This allows the connecting device to pre-calculate the target device's scanning frequencies and adjust its paging sequence in advance, so that when the Bluetooth connection attempt is made, the devices are already synchronized and ready to connect immediately, eliminating the prolonged connection time while keeping the pairing process simple
2Ease of operation
If traditional Bluetooth paging sequence is used without clock data adjustment, then the pairing process is straightforward, but pairing times are prolonged due to frequency scanning delays
Solution Approach 1:
The patent performs preliminary calculation of the target device's scanning frequencies using the clock data exchanged via NFC. This pre-computation allows the connecting device to jump directly to the correct frequency for paging, eliminating the need for traditional frequency hopping and scanning delays, thus significantly increasing pairing speed while maintaining operational simplicity
Solution Approach 2:
The patent uses the Bluetooth clock data as feedback to adjust the paging sequence. The clock information provides real-time synchronization data that allows the connecting device to dynamically adapt its paging strategy to match the target device's scanning pattern, ensuring optimal connection timing without complicating the user interface
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 significantly reduces Bluetooth pairing times, potentially halving the average connection time to approximately 0.64 seconds, enhancing the efficiency and reliability of OOB pairing processes.
Implementation Method 1
NFC technology is commonly used for contactless short-range communications based on radio frequency identification (RFID) standards, using magnetic field induction to enable communication between electronic devices
Data Source
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AI summary
A communications system may include a communications device including a first Bluetooth transceiver. The first Bluetooth transceiver may comprise a clock. The first Bluetooth transceiver may be capable of scanning a plurality of different operating frequencies for a pairing request based upon the clock. The communications device may further include an output device coupled with the Bluetooth transceiver and capable of outputting data associated with the clock via a communications path different than Bluetooth. The system may also include a mobile communications device including an input device capable of receiving the clock data from the output device via the communications path, and a second Bluetooth transceiver coupled with the input device and capable of generating the pairing request based upon the received clock data.