Multi-AP Coordination via Dynamic Channel Switching
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Solution Overview
Problem
In next-generation wireless communication systems, existing multi-AP coordination protocols face challenges in efficiently maintaining AP candidate sets, enabling temporary primary channel switches, and selecting shared APs for shared transmission opportunities (TXOP) due to issues like channel interference and APs operating on different frequency channels.
Innovation Solution
The solution involves setting conditions for APs to participate in AP candidate sets, selecting shared APs based on bandwidth compatibility, and using SH-TXOP switch frames to manage temporary primary channel changes, ensuring that shared APs switch to non-overlapping channels during shared TXOP operations, and generating temporal security keys for secure STA association.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If multiple APs operate on different frequency channels to avoid interference, then channel interference is reduced, but coordination complexity increases due to APs needing to switch primary channels for shared TXOP operations
Solution Approach 1:
The patent implements dynamic primary channel switching where APs can change their operating channel based on coordination needs. The coordinating AP selects shared APs from an AP candidate set and manages temporary primary channel assignments during shared TXOP operations, allowing the system to adapt channel configurations dynamically rather than using fixed assignments.
Solution Approach 2:
The coordinating AP acts as an intermediary that manages the AP candidate set and coordinates channel switching between multiple APs. It receives capability information from potential shared APs, maintains the candidate set, and makes selection decisions, thereby simplifying the coordination burden on individual APs and reducing overall system complexity.
2Stability of the object's composition
If APs maintain fixed primary channels for stable operation, then operational stability is improved, but shared TXOP operations become difficult when APs need to share transmission opportunities across different channels
Solution Approach 1:
The system allows APs to temporarily switch their primary channel during shared TXOP operations while maintaining stable operation otherwise. The coordinating AP manages this dynamic behavior by selecting appropriate shared APs from the candidate set and coordinating the temporary channel sharing, enabling both stability and adaptability.
Solution Approach 2:
The patent segments the AP population into coordinating APs and shared APs with distinct roles. The coordinating AP maintains the AP candidate set and manages channel coordination, while shared APs can be dynamically selected for specific shared TXOP operations. This segmentation allows fixed operation for most APs while enabling flexible channel sharing when needed.
3Reliability
If the AP candidate set is maintained with strict bandwidth matching requirements, then channel compatibility is improved, but the pool of available shared APs is reduced
Solution Approach 1:
The patent applies partial bandwidth matching where the shared AP's primary channel bandwidth doesn't need to exactly match the coordinating AP's channel bandwidth. Instead, the shared AP's primary channel is selected from within the coordinating AP's channel bandwidth, allowing APs with slightly different bandwidth capabilities to participate in the candidate set, thereby increasing the pool of available shared APs while maintaining sufficient compatibility.
4Adaptability or versatility
If temporary primary channel switching is enabled for shared TXOP, then shared transmission flexibility is improved, but the risk of channel interference increases during switching transitions
Solution Approach 1:
The coordinating AP acts as an intermediary that carefully manages temporary primary channel assignments during shared TXOP operations. It selects shared APs from the candidate set whose primary channels are compatible with the shared TXOP requirements, coordinating the switching to minimize interference risks while enabling flexible shared transmission when needed.
Data Source
AI summary
Disclosed is a method of setting conditions for an access point (AP) to be included in an AP candidate set of a coordinating AP for a transmission opportunity (TXOP), including setting a first primary channel of the AP as part of the AP candidate set of the coordinating AP within a basic service set (BSS) operating bandwidth of the coordinating AP, and coordinating AP updates in the AP candidate set when a coordinated AP that is part of the AP candidate set performs a channel switch to a second primary channel operating on a different bandwidth stream than a bandwidth stream of the first primary channel.