Dynamic WiFi Transmit Power Adjustment for Bluetooth Coexistence
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Solution Overview
Problem
Conventional combination devices with collocated communication circuits, such as Bluetooth and WiFi, face interference issues due to sharing the same frequency band, leading to higher packet error rates and reduced range for WiFi connections when operating simultaneously.
Innovation Solution
The system dynamically adjusts the transmit power of one communication circuit based on the mode of operation of the other circuit, allowing for higher power transmission when the first circuit is in a higher reliability mode and lower power when not, thereby minimizing interference and optimizing range and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If WiFi circuits transmit at high power level, then WiFi range is extended, but interference with Bluetooth circuits increases leading to higher packet error rates
Solution Approach 1:
The patent implements dynamic transmit power adjustment for WiFi circuits based on the operational state of Bluetooth circuits. The system transitions from static power levels to dynamic power control, where WiFi transmit power is adjusted in real-time according to Bluetooth activity and mode (classic Bluetooth vs. Bluetooth Low Energy), resolving the contradiction between maintaining WiFi range and preventing Bluetooth interference
Solution Approach 2:
The system changes the transmit power parameter of WiFi circuits based on detected Bluetooth operational parameters. When classic Bluetooth is detected, WiFi power is reduced to a first level; when BLE is detected, power is reduced to a second level; when no Bluetooth activity is present, full power is used. This parameter adaptation resolves the contradiction by matching power levels to specific operational contexts
2Reliability
If WiFi circuits reduce transmit power to minimize interference with Bluetooth, then Bluetooth packet error rate decreases, but WiFi range is reduced
Solution Approach 1:
Rather than maintaining a fixed reduced power level, the system dynamically adjusts WiFi transmit power based on actual Bluetooth operational needs. The power level transitions between multiple states (full power, first reduced level, second reduced level) according to real-time detection of Bluetooth mode and activity, thereby minimizing the impact on WiFi range while maintaining Bluetooth reliability
Solution Approach 2:
The system implements multiple discrete power levels (full power, first reduced level, second reduced level) rather than a single reduced power level. This allows selective application of power reduction only when and to the extent that Bluetooth interference requires it, preserving WiFi range performance during periods when Bluetooth interference is not an issue
3Reliability
If Bluetooth operates in long-range mode with encoding redundancy, then transmission reliability improves, but data transmission rate decreases
Solution Approach 1:
The patent leverages the encoding parameter changes inherent in Bluetooth long-range mode (using more symbols per data bit and forward error correction) to trigger corresponding WiFi power adjustments. The system detects the presence of classic Bluetooth with its robust encoding and responds by reducing WiFi power, thereby indirectly supporting Bluetooth's reliability-enhancing encoding strategy while managing spectral sharing
Data Source
AI summary
A method can include an integrated circuit device, determining if first communication circuits are operating in a first mode that wirelessly receives data at a first rate or a second mode that wirelessly receives data at a second rate that is lower than the first rate. If the first communication circuits are operating in the second mode, transmitting signals with the second communication circuits at a first power level, and if operating in the first mode, transmitting signals with the second communication circuits at a second power level that is lower than the first power level. In the first mode, X symbols per data bit are received and in the second mode, Y symbols per data bit are received, where X<Y. Corresponding devices and methods are also disclosed.