Dynamic RF Power Control for WiFi-ZigBee Coexistence
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
ZigBee connections often fail to establish due to interference from WiFi signals, particularly internal WiFi interference which is not adequately attenuated, leading to failed handshakes during the joining process in wireless communication devices.
Innovation Solution
The wireless communication device dynamically adjusts the transmission power of WiFi signals and the reception sensitivity of ZigBee signals by switching between different transceiving paths and using attenuators during the ZigBee joining process to minimize interference, ensuring successful connection establishment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the transmission power of WiFi signals is increased to improve WiFi communication performance, then WiFi signal coverage and strength are improved, but the interference to ZigBee signals during joining process increases, causing connection failures
Solution Approach 1:
The patent implements dynamic adjustment of WiFi transmission power based on the operational state. During ZigBee joining process, the system automatically reduces WiFi transmission power to minimize interference, while restoring normal power levels after successful ZigBee connection establishment. This dynamic power control resolves the contradiction between maintaining strong WiFi signals and preventing ZigBee interference.
Solution Approach 2:
The system changes the transmission power parameter of WiFi signals based on the communication state. By detecting whether ZigBee joining is in progress, the system adjusts the power parameter from normal high power to reduced power level, thereby resolving the interference issue without compromising WiFi performance during normal operation.
2Measurement precision
If the sensitivity of ZigBee signals is increased to improve ZigBee communication range, then ZigBee reception sensitivity is improved, but the ability to filter out WiFi interference decreases, leading to connection failures
Solution Approach 1:
The patent dynamically adjusts ZigBee reception sensitivity based on the operational state. During ZigBee joining process, the system temporarily reduces reception sensitivity to make the receiver less vulnerable to WiFi interference, while restoring high sensitivity after successful connection. This dynamic adjustment allows the system to maintain both good reception capability and interference rejection.
Solution Approach 2:
The system takes preliminary action by reducing ZigBee reception sensitivity before the joining process begins. This preemptive adjustment prevents WiFi interference from disrupting the connection establishment, while normal sensitivity is restored afterward to maintain full reception capability.
3Volume of moving object
If WiFi and ZigBee antennas are placed close together to reduce device size, then device compactness is improved, but the interference between WiFi and ZigBee signals increases, causing joining failures
Solution Approach 1:
The patent implements dynamic power adjustment for the WiFi antenna based on operational state. During ZigBee joining process, the system automatically reduces WiFi transmission power to minimize interference from the nearby WiFi antenna, while maintaining normal power levels during regular WiFi operation. This allows compact antenna placement without compromising ZigBee connection reliability.
Data Source
AI summary
A wireless communication device for transceiving heterogeneous radio-frequency (RF) signals is provided. The wireless communication device includes a first antenna, a second antenna, a first transceiver, a second transceiver and a controller. The first transceiver controls the first antenna through a first transceiving path to transceive a first RF signal according to a first wireless communication standard. The second transceiver controls the second antenna through a second transceiving path to transceive a second RF signal according to a second wireless communication standard. In a joining process when the wireless communication device establishes connection to an end device according to the second wireless communication standard, the controller reduces transmission power for transmitting the first RF signal, or reduces sensitivity for receiving the second RF signal.