Wi-Fi Channel Coordination for Cellular Co-Existence Interference
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Solution Overview
Problem
Interference between cellular and WiFi communications, particularly when devices support both technologies and are within short frequency separation or experience harmonic and intermodulation interference, leading to degraded reception quality.
Innovation Solution
A wireless station (STA) identifies unsafe WiFi channels affected by cellular interference and reports them to the WiFi access point (AP) or controller, allowing the AP to modify communication parameters to avoid these channels, using techniques like event report frames, BSS color collision reports, or preferred/not-preferred channel lists to mitigate interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If devices use both cellular and WiFi technologies concurrently, then communication versatility is improved, but interference between the two systems degrades reception quality
Solution Approach 1:
The system performs preliminary channel assessment and identifies unsafe WiFi channels that may cause interference with cellular operations before actual communication begins. The STA reports these unsafe channels to the AP in advance, allowing the AP to proactively switch to safe channels or adjust transmission parameters to avoid interference issues.
Solution Approach 2:
The system implements feedback mechanisms where the STA monitors and reports channel conditions, interference levels, and communication quality metrics to the AP. Based on this feedback, the AP dynamically adjusts transmission parameters, selects optimal channels, and modifies communication behavior to maintain reliable reception while avoiding cellular interference.
2Reliability
If WiFi channels are dynamically adjusted to avoid cellular interference, then reception quality is improved, but system complexity increases
Solution Approach 1:
The STA autonomously performs channel assessment, identifies unsafe channels, and reports findings to the AP without requiring complex centralized control. The system uses self-service mechanisms where individual devices monitor their own interference conditions and independently contribute information to the overall channel selection process, reducing the complexity burden on the AP and network controller.
3Reliability
If the AP monitors and responds to channel changes, then interference avoidance is improved, but response time and processing overhead increase
Solution Approach 1:
The system performs preliminary identification and reporting of unsafe channels before actual interference occurs. By assessing channel conditions in advance and reporting them proactively, the AP can pre-emptively switch to safe channels, reducing the time needed to respond to interference events and minimizing communication disruptions.
Data Source
AI summary
Techniques for wireless communications are disclosed. These techniques include identifying a change in at least one of: (i) a WiFi radio channel or (ii) a cellular radio channel for a wireless station (STA) supporting both WiFi and cellular radio access technologies. The techniques further include determining one or more WiFi radio channels subject to interference from the cellular radio for the STA, based on a network message received from the STA, and modifying one or more parameters for WiFi communication relating to the STA, based on the determined one or more WiFi radio channels subject to interference.