Wireless LAN BSS Group Scheduling With Shared Channel Status
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Solution Overview
Problem
Existing wireless LAN systems face challenges in supporting BSS group-based scheduling, obtaining channel status information, and facilitating seamless roaming operations without separate association procedures.
Innovation Solution
A method and device for transmitting and receiving physical layer protocol data units within a BSS group, involving a first access point that acquires and shares channel status information with multiple second APs, and a station that reports this information to support scheduling and seamless roaming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a first access point transmits and shares channel status information with multiple second APs in a BSS group, then BSS group-based scheduling is enabled and communication efficiency is improved, but device complexity and information management overhead increase
Solution Approach 1:
The patent combines channel status information from multiple second APs into a unified data structure at the first AP. This merging approach enables centralized BSS group-based scheduling while managing information complexity through structured consolidation of channel status reports from multiple APs
Solution Approach 2:
The first AP performs multiple functions: it acts as a coordinator for BSS group scheduling, a collector of channel status information from multiple second APs, and a scheduler that makes transmission decisions. This multi-functionality resolves the contradiction by consolidating information management tasks in a single entity rather than distributing complexity across all APs
2Measurement precision
If channel status information is collected from multiple second APs for BSS group scheduling, then scheduling accuracy and resource allocation improve, but loss of time for information collection and processing increases
Solution Approach 1:
The patent implements periodic collection of channel status information from second APs, preparing this data in advance for scheduling decisions. This preliminary action allows the first AP to have channel status information ready before scheduling is needed, reducing the time penalty during actual scheduling operations
Solution Approach 2:
The system maintains continuous channel status information collection from multiple second APs, ensuring that scheduling decisions are always based on current and accurate channel conditions. This continuous information gathering balances the need for scheduling accuracy with efficient time management through established periodic processes
3Ease of operation
If seamless roaming operation is supported within a BSS group without separate association procedure, then user mobility and service continuity are improved, but device complexity for maintaining BSS group coordination increases
Solution Approach 1:
The first AP serves as an intermediary that coordinates channel status information and scheduling decisions among multiple second APs in the BSS group. This intermediary role enables seamless roaming by managing the complexity of inter-AP coordination centrally, allowing STAs to roam without direct involvement in complex coordination protocols
Solution Approach 2:
The patent segments the BSS group into a hierarchical structure with a first AP that handles coordination and scheduling functions, and multiple second APs that handle local STA communications. This segmentation isolates the complexity of BSS group coordination to the first AP, simplifying operations for second APs and enabling seamless roaming for STAs
Data Source
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AI summary
A method and a device for supporting BSS group-based scheduling in a wireless LAN system are disclosed. A method performed by a first access point (AP) in a wireless LAN system according to an embodiment of the present disclosure may comprise the steps of: transmitting, to a plurality of second APs belonging to a preconfigured BSS group, information for indicating a procedure for obtaining channel status information for a station (STA) belonging to the preconfigured BSS group; receiving reporting information including the channel status information from the plurality of second APs; and transmitting information for scheduling data transmission based on the preconfigured BSS group to one or more second APs among the plurality of second APs.