Selective Channel Switching for Multi-AP C-OFDMA Power Saving
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Solution Overview
Problem
Existing wireless local area network (WLAN) systems with multiple access points (APs) face challenges in efficiently managing channel allocation and switching for orthogonal frequency division multiplexing access (OFDMA) transmissions, leading to inefficiencies and increased power consumption among stations (STAs).
Innovation Solution
A method where a shared AP allocates a first channel to STAs and requests a channel switch for coordinated OFDMA transmission, transmitting the request only to participating STAs, allowing non-participating STAs to operate in a power-saving mode, and coordinating channel allocation among multiple APs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a shared AP allocates a first channel to multiple STAs and then requests a channel switch for C-OFDMA transmission, then channel utilization is improved, but non-participating STAs cannot operate in power-saving mode leading to increased power consumption
Solution Approach 1:
The patent segments the STAs into two distinct groups: participating STAs that receive channel switching signals and switch to the second channel for C-OFDMA transmission, and non-participating STAs that remain on the first channel and can enter power-saving mode. This segmentation resolves the contradiction by allowing different power consumption behaviors for different STA groups while maintaining improved channel utilization through coordinated transmission among participating STAs.
Solution Approach 2:
The patent applies local quality by providing differentiated channel switching signals to different STA groups based on their participation status in C-OFDMA. Participating STAs receive signals instructing them to switch to the second channel, while non-participating STAs receive no such signal and remain on the first channel in power-saving mode. This localized differentiation resolves the contradiction by optimizing both channel utilization for participating STAs and power consumption for non-participating STAs simultaneously.
2Ease of operation
If a channel switching signal is transmitted to all STAs, then all STAs can switch channels uniformly, but non-participating STAs waste power by switching unnecessarily
Solution Approach 1:
The patent extracts the channel switching operation from being a universal action applied to all STAs and applies it selectively only to participating STAs. The shared AP identifies which STAs should participate in C-OFDMA transmission and sends channel switching signals only to those STAs, while non-participating STAs remain on the original channel. This extraction resolves the contradiction by eliminating unnecessary power consumption from uniform channel switching while maintaining operational simplicity for the participating group.
Solution Approach 2:
The patent implements partial action by applying channel switching only to the subset of STAs that need to participate in C-OFDMA transmission, rather than applying it excessively to all STAs. This partial application of the channel switching operation resolves the contradiction by avoiding unnecessary power consumption for non-participating STAs while ensuring proper channel switching for those who need it for coordinated transmission.
3Productivity
If multiple APs coordinate channel allocation for C-OFDMA transmission, then transmission efficiency is improved, but channel management complexity increases
Solution Approach 1:
The patent introduces a shared AP as an intermediary that coordinates channel allocation among multiple APs for C-OFDMA transmission. The shared AP receives channel allocation information from other APs, manages the channel switching signals, and orchestrates the coordinated transmission. This intermediary approach resolves the contradiction by improving transmission efficiency through multi-AP coordination while containing management complexity within the shared AP rather than requiring complex direct coordination among all APs.
Data Source
AI summary
The present invention relates to a method performed by a shared AP in a wireless LAN system, the method comprising the steps of: allocating a first channel to first and second stations (STAs), wherein the shared AP is associated with the first and second STAs; receiving, from a sharing AP, an allocation of a second channel for transmission of coordinated orthogonal frequency division multiplexing access (C-OFDMA); and transmitting a channel switching signal that requests channel switching from the first channel to the second channel, wherein the channel switching signal is only transmitted to the first STA participating in the C-OFDMA, but not to the second STA not participating in the C-OFDMA.