Wi-Fi Channel Access Using Device-Type CW Assignment for Fairness
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Solution Overview
Problem
Multi-link devices coexisting with single-link devices in a Wi-Fi network experience significant degradation in transmission performance due to inefficient channel access techniques, leading to unfairness in channel usage.
Innovation Solution
A Wi-Fi channel access control apparatus and method that identifies the types of devices connected to multiple links and assigns different minimum contention window (CW) values to improve fairness, prioritizing devices with lower performance and adjusting CW values based on traffic category and network environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-link devices use multi-link operation to transmit multiple data streams simultaneously, then throughput and transmission speed are improved, but transmission performance of coexisting single-link devices degrades significantly
Solution Approach 1:
The patent applies local quality by assigning different minimum contention window values to different device types. Multi-link devices are assigned a first minimum CW value while single-link devices are assigned a second minimum CW value, creating differentiated channel access parameters tailored to each device's capabilities and needs.
Solution Approach 2:
The patent changes the channel access parameter (minimum contention window value) based on device type. By adjusting this parameter, the system optimizes channel access behavior for multi-link devices while maintaining fair coexistence with single-link devices, resolving the performance degradation issue.
2Speed
If multi-link devices use multi-link operation to transmit multiple data streams simultaneously, then transmission speed is improved, but fairness in channel usage deteriorates
Solution Approach 1:
The patent implements local quality by applying different minimum contention window values specifically to multi-link devices versus single-link devices. This differentiated approach ensures that multi-link devices can achieve higher transmission speeds while single-link devices maintain fair channel access, preventing one type of device from monopolizing the channel.
Solution Approach 2:
The patent introduces dynamic parameter adjustment where the minimum contention window value changes based on device type identification. The access point dynamically assigns appropriate CW values when devices associate with the network, enabling adaptive channel access that maintains fairness while supporting high-speed multi-link operation.
3Device complexity
If existing Wi-Fi devices use single-link operation to communicate with one device at one time point, then channel access control is simple, but transmission performance is limited
Solution Approach 1:
The patent applies dynamics by making the minimum contention window value adjustable based on device type. While maintaining the simple CSMA/CA framework, the system dynamically adapts the CW parameter for multi-link devices, enabling improved transmission performance without fundamentally changing the channel access control mechanism.
Solution Approach 2:
The patent changes the minimum contention window parameter to enable multi-link devices to achieve better transmission performance. By modifying this key parameter rather than redesigning the entire channel access control system, the patent maintains simplicity while improving productivity for advanced devices.
Data Source
AI summary
Provided is an apparatus for controlling Wi-Fi channel connection which includes a wireless communication circuit configured to provide multiple links and be capable of multi-link operation, and a processor configured to be functionally connected to the wireless communication circuit, wherein the processor identifies types of devices connected to the multiple links at a specified time point, and assigns different minimum contention window (CW) values to the connected devices according to the identified types.