Bluetooth Fast Paging via Pre-Synchronized Clocks
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Solution Overview
Problem
Conventional Bluetooth connection procedures are slow due to the need for estimating and predicting clock frequencies, leading to prolonged connection setup times, especially in scenarios requiring quick reconnection during streaming.
Innovation Solution
A fast paging procedure that eliminates the need for frequency hopping by using a limited set of predetermined frequencies for both the master and slave devices to establish a connection, allowing them to respond at a fixed sequence of frequencies without clock estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional frequency hopping with clock estimation is used, then connection reliability is maintained, but connection setup time becomes prolonged
Solution Approach 1:
The patent extracts and eliminates the frequency hopping mechanism from the Bluetooth connection procedure. By removing the complex frequency estimation and prediction steps, the invention achieves direct connection establishment without time-consuming frequency searches, thereby resolving the contradiction between connection speed and procedural complexity
Solution Approach 2:
The patent implements preliminary clock synchronization before the connection procedure begins. By pre-synchronizing the clocks of master and slave devices, the system eliminates the need for subsequent frequency estimation and prediction, enabling immediate connection establishment and reducing setup time without requiring complex frequency hopping
2Loss of time
If multiple frequency trains A and B are used for page scanning, then connection reliability is improved, but connection setup time increases
Solution Approach 1:
The patent performs clock synchronization as a preliminary action before the connection procedure. This pre-synchronization ensures that both master and slave devices are time-aligned, allowing immediate successful connection without needing to traverse multiple frequency trains, thus achieving both fast connection and reliable communication
Solution Approach 2:
The invention removes the frequency train switching mechanism (trains A and B) from the connection procedure. By extracting this complex frequency search process and replacing it with pre-synchronized direct connection, the system achieves faster link establishment while maintaining connection reliability through the synchronized timing
Data Source
AI summary
There is provided a fast paging procedure in which a master device repeatedly sends the paging message to a slave device using predetermined channel frequencies, wherein a selection of the predetermined channel frequencies is not calculated or predicted from the slave's Bluetooth device address. When the master device receives a slave page response message at one frequency among the predetermined channel frequencies, the master device transmits an FHS packet to the slave device at the same frequency in which the slave page response message was received.