BLE Advertiser RSSI-Based Transmit Power Adjustment
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Solution Overview
Problem
Bluetooth Low Energy (BLE) advertisers face challenges in conserving transmit power while maintaining compliance with the Bluetooth specification, especially when responding to scan requests from remote devices.
Innovation Solution
The system and method involve determining the signal strength of incoming scan request packets and adjusting the transmit power accordingly. If the remote device is deemed nearby based on high signal strength, the advertiser can reduce its transmit power for scan response packets, using a lookup table, algorithm, or equation to determine the adjusted power levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the advertiser transmits advertisements and scan response packets at high transmit power to ensure reliable communication, then communication reliability is improved, but battery power consumption increases
Solution Approach 1:
The patent applies dynamics by making the transmit power adjustable rather than fixed. The advertiser dynamically changes its transmit power level based on the RSSI of received scan request packets. When a scan request packet with high RSSI (indicating nearby device) is received, the advertiser uses lower transmit power for the scan response packet. When the RSSI is low (indicating distant device), the advertiser uses higher transmit power. This dynamic adjustment resolves the contradiction between maintaining communication reliability and reducing power consumption.
Solution Approach 2:
The patent changes the transmit power parameter based on the RSSI parameter of the received scan request packet. By establishing a relationship between these two parameters (using lookup tables, algorithms, or equations as specified in the patent), the system optimizes the transmit power level to achieve reliable communication while minimizing energy consumption. This parameter change approach directly addresses the technical contradiction.
2Use of energy by moving object
If the advertiser reduces transmit power to conserve battery life, then power consumption is reduced, but communication reliability may deteriorate
Solution Approach 1:
The patent implements feedback by using the RSSI value from the received scan request packet to determine the appropriate transmit power level for the scan response packet. The advertiser continuously monitors the signal strength of incoming packets and adjusts its transmit power accordingly. This feedback mechanism ensures that communication reliability is maintained by using higher power when needed (low RSSI) while conserving energy when not needed (high RSSI), thus resolving the contradiction.
3Device complexity
If the advertiser uses fixed transmit power for all packets, then device complexity is reduced, but energy efficiency deteriorates
Solution Approach 1:
The patent introduces dynamic transmit power adjustment based on RSSI feedback, which increases energy efficiency while adding minimal complexity. The core mechanism involves comparing the RSSI of received scan request packets with predefined thresholds or using simple lookup tables to determine the appropriate transmit power level. This dynamic approach significantly improves energy efficiency compared to fixed power transmission, while the implementation remains relatively simple through the use of threshold-based or lookup table-based power selection.
Solution Approach 2:
The patent changes the transmit power parameter based on the RSSI parameter, creating an adaptive system that improves energy efficiency. The relationship between RSSI and transmit power can be established through simple lookup tables, algorithms, or equations, which add minimal computational complexity while achieving significant energy savings. This parameter change strategy resolves the contradiction between device complexity and energy efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces power consumption in BLE advertisers by optimizing transmit power based on signal strength, thereby extending battery life without compromising Bluetooth compliance or network performance.
Implementation Method 1
determine the RSSI of the scan request packet
Data Source
AI summary
A system and method for reducing power consumption in an advertiser in a Bluetooth network is disclosed. The advertiser transmits the advertisement in accordance with the Bluetooth protocol and listens for scan request packets. If a scan request packet is received from a remote device, the advertiser determines the signal strength of the incoming scan request packet and adjusts its transmit power based on this determination. This determination may allow the advertiser to reduce its transmit power if the remote device that transmits the scan request is believed to be nearby. The advertiser then transmits a scan response packet using this adjusted transmit power. This technique may be used for both legacy and extended advertising.