Bluetooth SCO Channel Bandwidth Management via Dynamic Slot Release
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Solution Overview
Problem
Bluetooth devices waste bandwidth due to fixed slot allocations for synchronous connection-oriented (SCO) channels, even when no sound is being transmitted, as they maintain TX and RX slots at regular intervals regardless of speech activity.
Innovation Solution
A method to dynamically manage SCO channel slot bandwidth by monitoring sound signal intensity, releasing slots when intensity is below a default value and reallocating them for data transmission, using sensors or digital signal processors to determine intensity and redistribute slots for efficient bandwidth use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed slots are allocated for SCO channel to ensure continuous sound transmission capability, then communication quality is maintained, but bandwidth is wasted when no sound is being transmitted
Solution Approach 1:
The patent applies dynamics by making the SCO channel slot allocation dynamic rather than fixed. The system continuously monitors sound signal intensity and adjusts slot allocation in real-time: when sound intensity exceeds a threshold, slots are allocated for sound transmission; when intensity remains below the threshold for a predetermined period, slots are released for other data transmissions. This dynamic adjustment resolves the contradiction by maintaining communication quality when needed while eliminating bandwidth waste during silence periods.
Solution Approach 2:
The patent changes the parameter of slot allocation state from fixed to variable based on sound signal intensity. By monitoring the intensity parameter and comparing it against a threshold, the system transitions between two states: allocated (when intensity > threshold) and released (when intensity < threshold for predetermined time). This parameter-based control mechanism allows the system to adapt slot allocation to actual transmission needs, resolving the contradiction between maintaining communication quality and reducing bandwidth waste.
2Reliability
If TX slots and RX slots are distributed at fixed intervals to avoid on-and-off sound transmission, then communication quality is improved, but transmission bandwidth is wasted
Solution Approach 1:
The patent makes the slot distribution dynamic by releasing slots during silence periods and reallocating them when sound is detected. Instead of maintaining fixed interval distributions regardless of activity, the system adapts the distribution pattern to actual transmission needs, improving bandwidth utilization while maintaining quality during active transmission periods.
Solution Approach 2:
The patent applies discarding and recovering by temporarily releasing (discarding) slot allocations during silence periods when no sound transmission is needed, and then recovering (reallocating) these slots when sound activity is detected again. This allows the bandwidth to be reused for other purposes during idle periods while ensuring availability when needed.
3Productivity
If packet length is made asymmetrical to match actual speech patterns, then bandwidth efficiency is improved, but slots must still appear in pairs which wastes bandwidth when neither side speaks
Solution Approach 1:
The patent extracts the unnecessary slot allocations during silence periods and removes them from the active channel configuration. By monitoring sound intensity and releasing slots when no speech is detected, the system separates the essential transmission slots (when needed) from the wasteful allocated slots (during silence), thereby eliminating bandwidth waste while maintaining efficiency during active transmission.
Solution Approach 2:
The patent changes the allocation state parameter from permanently allocated to conditionally allocated based on speech activity detection. This parameter change allows the system to transition between allocated and released states, resolving the contradiction by maintaining asymmetrical packet lengths for efficiency while dynamically adjusting overall slot availability to eliminate waste during silence periods.
Data Source
AI summary
A Bluetooth device and a bandwidth managing method thereof are disclosed. The Bluetooth device is connected to a remote device by establishing a synchronous connection oriented (SCO) channel. The intensity of the sound signal is monitored. If the intensity of the sound signal is larger than the default value, the slots of the SCO channel are used to transmit the sound value to the remote device. If the intensity of the sound signal is smaller than the default value, the bandwidth occupied by the slots is dynamically released to avoid the waste of the bandwidth.