Bluetooth Sniff Mode Power Conservation Method

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Solution Overview

Problem

Bluetooth devices consume significant power when frequently switching between sleep and wake modes due to the necessary preparation work required for these transitions, which shortens battery life.

Innovation Solution

The method involves establishing a Bluetooth link, controlling the device to enter sniff mode, handling a sniff anchor point after wakeup preparation and before sleep preparation, and concentrating multiple wakeup operations between these preparations to minimize transitions and reduce power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If the Bluetooth device frequently switches between sleep mode and wakeup mode, then the device can respond to connection requests timely, but the preparation work during mode switching consumes significant power and shortens battery life

Engineering Contradiction:
Improveresponse speed to connection requestsVSAvoidpower consumption during mode switching
Core Design Contradiction:
SpeedVSUse of energy by moving object

Solution Approach 1:

The patent applies preliminary action by performing wakeup preparation work once before a series of wakeup operations, rather than repeating preparation for each individual wakeup. The controller enters sniff mode after wakeup preparation and handles multiple wakeup operations (including sniff anchor points and incoming connections) before returning to sleep mode, thus preparing in advance for potential connection requests and avoiding repeated preparation overhead.

Inventive Principle:
Principle #10Preliminary action

2Loss of energy

If the Bluetooth device enters sleep mode to save power, then power consumption is reduced, but the device requires preparation work to leave and re-enter sleep mode which consumes power

Engineering Contradiction:
Improvepower consumption during operationVSAvoidcomplexity of mode transition management
Core Design Contradiction:
Loss of energyVSDevice complexity

Solution Approach 1:

The patent merges multiple wakeup operations into a single extended awake period. Instead of entering and exiting sleep mode for each individual operation (connection handling, sniff anchor points, etc.), the controller enters sniff mode once after wakeup preparation and handles all necessary operations during this single awake period, then returns to sleep mode once. This combining of operations reduces the total number of mode transitions and associated preparation work.

Inventive Principle:
Principle #5Merging (Combining)

Data Source

PatentUS9037086B2Method for controlling bluetooth device for power conservation
Publication Date: 2015.05.19 MEDIATEK INC
  • US9037086B2 patent drawing
  • US9037086B2 patent drawing
  • US9037086B2 patent drawing

AI summary

A method for controlling a Bluetooth device for power conservation includes the steps of: establishing a Bluetooth link; controlling the Bluetooth device to enter sniff mode; handling a sniff anchor point after wakeup preparation and before sleep preparation; and handling a wakeup operation between the wakeup preparation and the sleep preparation. The wakeup/sleep preparation can be also done as few times as possible in the invention such that the power consumption of the Bluetooth device is effectively reduced.