Multi-Link Action Frames for Selective AP Information Requests
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Solution Overview
Problem
The increased number of spatial streams in new WLAN standards like IEEE 802.11be requires improved signaling techniques to efficiently manage multi-link devices (MLDs) and reduce frame overhead.
Innovation Solution
A method and apparatus are proposed where a non-AP STA requests information from another AP using an action frame with a defined MLD action field and ML element field, reducing frame overhead by including only necessary information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If complete information on all links is requested using traditional probe request frames, then information completeness is improved, but frame overhead increases significantly
Solution Approach 1:
The patent segments the information request process by introducing a selective profile request mechanism. Instead of requesting complete information for all links simultaneously, the system allows targeted requests for specific link profiles based on the MLD's operational needs. This is achieved through the Per-STA Control field with the Complete Profile subfield that can be selectively set, dividing the information retrieval process into manageable segments rather than a monolithic request.
Solution Approach 2:
The patent applies partial action by enabling non-AP MLDs to request only the necessary profile information for links they need to operate, rather than requesting complete information for all links. The Complete Profile subfield can be set to 1 for specific links when full information is needed, or omitted when only basic information is required, allowing partial information retrieval that reduces overall frame overhead while maintaining sufficiency for the intended operation.
2Productivity
If multi-link operation is implemented with increased spatial streams, then communication capacity is improved, but signaling complexity increases
Solution Approach 1:
The patent makes the action frame structure universal by reusing the existing Multi-link Element and Per-STA Profile subelement framework for both capability negotiation and selective information requests. This multi-functional approach allows the same basic frame structure to serve multiple purposes: indicating supported links, requesting specific profiles, and managing operational parameters, thereby reducing signaling complexity compared to dedicated frames for each function.
Solution Approach 2:
The patent utilizes parameter changes within the existing frame structure, specifically the Complete Profile subfield in the Per-STA Control field, to control the level of information requested. By changing this single parameter (setting it to 1 or omitting it), the system can dynamically adjust the information request from complete to partial, providing flexibility without requiring complex signaling mechanisms for different request types.
3Weight of stationary object
If action frame with selective profile request is used, then frame overhead is reduced, but information retrieval flexibility may be compromised
Solution Approach 1:
The patent introduces dynamics to the information retrieval process through the selective Complete Profile subfield mechanism. The non-AP MLD can dynamically adjust the level of information requested for each link based on real-time operational needs. This dynamic approach allows the system to switch between requesting complete profiles and basic profiles as needed, providing flexibility while maintaining reduced overhead compared to always requesting complete information.
Solution Approach 2:
The patent applies preliminary action by allowing non-AP MLDs to request complete profiles in advance for links that will be needed for operation. The Complete Profile subfield can be set to 1 before actual data exchange begins, ensuring that necessary information is available when needed. This preliminary information retrieval reduces the need for subsequent follow-up requests and maintains operational flexibility.
Data Source
AI summary
Proposed are a method and a device for requesting information on another AP in a transmission MLD by using an action frame in a wireless LAN system. Specifically, a reception MLD transmits a first action frame to a transmission MLD via a first link. The reception MLD receives a second action frame from the transmission MLD via the first link. The transmission MLD includes a first transmission STA operating in the first link and a second transmission STA operating in a second link. The reception MLD includes a first reception STA operating in the first link. The first action frame includes a first category field, a first MLD action field, and a first ML element field.