BLE Advertising Packet Timing Arbitration for Power and Latency
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Solution Overview
Problem
Bluetooth Low Energy (BLE) devices face challenges in maintaining low power consumption while establishing efficient wireless connections due to the lack of a specific arbitration protocol, leading to potential collisions and increased power usage during the advertising packet transmission process.
Innovation Solution
The proposed solution involves modifying the advertising packet issuance timing parameters using the equations advIntervalH=scanInterval*N+1.5*scanWindowM-advDelay2 and advIntervalL=scanInterval*N-1.5*scanWindowM-advDelay2, where N and M are natural integers, to optimize the advertising interval and reduce power consumption, thereby shortening the discovery time and conserving battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If advertising packets are transmitted frequently to establish wireless connection quickly, then connection establishment speed is improved, but power consumption increases
Solution Approach 1:
The patent applies dynamics by making the advertising packet transmission interval adjustable rather than fixed. The system dynamically modifies the advertising interval based on connection establishment success, initially using shorter intervals for quick connection and extending intervals when connections are successful, thereby adapting transmission frequency to actual needs and reducing overall power consumption.
Solution Approach 2:
The patent changes the timing parameter (advertising interval) to resolve the contradiction. By modifying the advertising interval from a fixed value to a variable that can be extended based on connection success, the system achieves both quick initial connection and reduced power consumption during subsequent operations.
2Loss of time
If advertising packet transmission interval is shortened to reduce discovery time, then device discovery efficiency is improved, but battery life is reduced
Solution Approach 1:
The patent uses periodic action with variable periods. Advertising packets are transmitted periodically, but the period (interval) is dynamically adjusted. Initially, shorter periods enable quick discovery, but once connection is established, the period is extended to reduce transmission frequency and conserve battery life, thus resolving the time-battery life contradiction.
Solution Approach 2:
The system dynamically adjusts the advertising interval based on connection status. The interval is short during discovery phase to minimize loss of time, then dynamically extended after successful connection to preserve battery life, making the transmission schedule adaptive rather than static.
3Adaptability or versatility
If multiple devices transmit advertising packets simultaneously without arbitration protocol, then device compatibility is maintained, but signal collisions increase
Solution Approach 1:
The patent applies preliminary action by having devices perform timing calculations and adjustments before actual connection attempts. By pre-calculating optimal advertising intervals and timing parameters based on scan interval and scan window values, devices can coordinate their transmissions to avoid collisions while maintaining compatibility with standard BLE protocols.
Solution Approach 2:
The system uses feedback from connection attempt outcomes to adjust future advertising packet timing. When connection attempts fail or collisions occur, the system modifies the advertising interval based on feedback from the connection process, improving signal transmission reliability while maintaining device compatibility through iterative optimization.
Data Source
AI summary
An efficient wireless connection protocol is described.