Bluetooth Low Energy Slave Channel Selection for Power Reduction
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Solution Overview
Problem
In wireless communication devices using Bluetooth low energy, the continuous use of three advertising channels by slaves leads to unnecessary power consumption during communication with masters.
Innovation Solution
A wireless communication apparatus that selectively determines and uses one channel from the three advertising channels for subsequent connections, reducing power consumption by limiting the channels used for advertising after an initial connection is established.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the slave transmits advertise using three channels, then the reliability of connection establishment is improved, but the power consumption increases
Solution Approach 1:
The patent divides the three advertising channels into two groups: a first advertising channel for initial connection establishment and a second advertising channel for subsequent connections. This segmentation allows the slave to limit channel usage to one channel for reconnections, reducing power consumption while maintaining reliable connection establishment through the structured channel division.
Solution Approach 2:
The master determines and notifies the slave of the second advertising channel to be used for subsequent connections before the slave actually uses it. This preliminary action allows the slave to prepare in advance by storing the channel information, enabling efficient one-channel operation for reconnections without needing to scan all three channels, thus reducing power consumption while ensuring reliable reconnection.
2Adaptability or versatility
If the slave always uses three channels for advertise, then the adaptability to different communication scenarios is improved, but the device complexity increases
Solution Approach 1:
The patent implements dynamic channel selection where the slave adapts its advertising behavior based on connection state: using the first advertising channel for initial connections and the second advertising channel for subsequent connections. This dynamic approach maintains adaptability to different communication scenarios while reducing complexity by limiting active channel monitoring to one channel at a time rather than all three channels simultaneously.
Data Source
AI summary
When the first connection is established with a slave, the master determines one channel selected from three advertising channels, as a channel used for establishment of the subsequent connection with the slave, and notifies the slave of the one channel. When the first connection is established with the master, the slave transmits an advertise in the three advertising channels. Further, when the second or subsequent connection is established with the master, the slave transmits the advertise in the one channel notified of from the master.