Bluetooth Sniff-Interval Power Adaptation for Lower POLL Energy
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Solution Overview
Problem
The Bluetooth specification's sniff mode results in unnecessary power consumption due to multiple POLL packet transmissions, even when the peripheral device is synchronized, as it requires central devices to transmit packets regardless of data availability.
Innovation Solution
Adaptive transmit power adjustment by central devices, using negotiated power for the first packet and reducing power for subsequent packets only after receiving a response from the peripheral device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple POLL packets are transmitted during each sniff interval to ensure synchronization and data transmission, then the peripheral device remains synchronized to the central device, but the central device experiences increased power consumption
Solution Approach 1:
The patent applies dynamics by making the transmit power adaptive rather than static. The central device dynamically adjusts transmit power based on whether a response is received: using full negotiated power for the first packet, then switching to reduced power for subsequent packets if no response is needed. This dynamic adjustment resolves the contradiction by maintaining synchronization reliability when necessary while reducing power consumption when the peripheral is already synchronized.
Solution Approach 2:
The patent changes the power parameter from a fixed negotiated value to a variable that can take two states: full negotiated power or reduced power. This parameter change allows the system to maintain the minimum necessary power for reliable communication while reducing unnecessary power consumption during routine synchronization packets, directly addressing the technical contradiction.
2Adaptability or versatility
If the central device transmits multiple POLL packets during sniff intervals, then new DATA packets can be transmitted if data becomes available, but unnecessary POLL packets are transmitted when no data is available, wasting power
Solution Approach 1:
The patent extracts the unnecessary POLL packets from the transmission sequence. By monitoring whether data is actually available to transmit, the central device removes redundant POLL packets that would otherwise be transmitted unnecessarily. This extraction eliminates wasted energy while preserving the capability to transmit DATA packets when needed, resolving the contradiction between transmission flexibility and energy loss.
Solution Approach 2:
The patent applies partial action by transmitting only the necessary number of POLL packets rather than always transmitting the full configured number. When data is available, the central device transmits POLL packets up to the point where data transmission is needed. When no data is available, it transmits fewer POLL packets than the maximum configured amount, avoiding excessive power consumption while maintaining the ability to transmit data when it becomes available.
Data Source
AI summary
Systems and methods for reducing power consumption by using adaptive transmit power during sniff intervals are disclosed. The central device transmits the first packet of the sniff interval using the previously negotiated transmit power. After the central device receives a response from the peripheral device, the central device uses a lower transmit power for subsequent POLL packets during that sniff interval. This scheme may reduce the power consumption of the central device significantly, especially when a large number of packets are transmitted during each sniff interval.