BTM Request Frame Indication for Clearer Multi-Link BSS Transitions
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Solution Overview
Problem
Existing wireless communication technologies lack comprehensive information indication during basic service set transition management (BTM) for non-AP multi-link devices (MLD), particularly in scenarios involving AP MLDs and non-AP MLDs, leading to unclear attitudes and behaviors during BSS transitions.
Innovation Solution
Enhanced BTM request frames with additional indication fields and information elements to clarify the treatment of APs and AP sets not present in the candidate list, using abridged and extended fields to indicate association preferences and exclusions, improving clarity and compatibility without increasing overheads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If existing BTM request frames are used for BSS transition management, then the basic transition function is maintained, but the information indication is incomplete and unclear for non-AP MLDs
Solution Approach 1:
The patent segments the indication information into two distinct fields: an abridged field for concise indication and an extended field for detailed information. This segmentation allows the BTM request frame to provide complete information indication without overwhelming complexity, as each field serves a specific purpose and can be independently processed by the non-AP MLD.
Solution Approach 2:
The patent adds a new dimension to the BTM request frame structure by introducing indication fields that operate at a different level of detail. The abridged field provides high-level indication while the extended field provides granular details, creating a multi-dimensional information structure that enhances completeness without linearly increasing complexity.
2Reliability
If additional indication fields are added to clarify AP MLD attitudes and behaviors, then the clarity of BSS transition guidance is improved, but the frame overhead increases
Solution Approach 1:
The patent implements partial indication by providing only the necessary level of detail in the abridged field for common scenarios, while the extended field contains additional information only when needed. This partial action approach ensures that most BSS transition operations can proceed with minimal overhead, while still providing complete information when required for complex scenarios.
Solution Approach 2:
The indication fields are designed to serve multiple functions: they can indicate AP MLD attitudes toward candidate lists, provide behavior guidance for non-AP MLDs, and convey both high-level and detailed information. This multi-functionality reduces the need for separate dedicated fields for each specific indication, thereby controlling overhead while maintaining reliability.
3Loss of information
If comprehensive information about AP treatments is provided, then the non-AP MLD's understanding of AP MLD attitude and behavior is clarified, but the processing complexity increases
Solution Approach 1:
The patent segments information about AP MLD attitudes and behaviors into the abridged field for quick processing and the extended field for detailed analysis. The non-AP MLD can first process the abridged field to obtain essential attitude information, then selectively process the extended field only when additional detail is needed, thereby reducing overall processing complexity while maintaining comprehensive understanding.
Solution Approach 2:
The abridged field provides preliminary indication of AP MLD attitudes and behaviors before the non-AP MLD needs to perform detailed processing. This preliminary action allows the non-AP MLD to quickly assess the situation and only engage in complex processing when necessary, reducing the average processing complexity while ensuring complete information is available when needed.
Data Source
AI summary
This application relates to an information indication method in BTM and an apparatus. The method includes: An AP MLD generates and sends a BTM request frame. The BTM request frame includes first indication information indicating treatment for a BSSID or an AP MLD not listed in a BSS transition candidate list entries field, and treatment for an AP not present in a recommended AP set in a candidate target AP MLD listed in the BSS transition candidate list entries field. According to this application, an information indication in the BTM can be improved. This application is applied to a WLAN system that supports a 802.11 series protocol such as a next-generation Wi-Fi protocol of 802.11ax like 802.11be, Wi-Fi 7, or EHT, a next generation of 802.11be like Wi-Fi 8 or UHR, or Wi-Fi AI. This application is further applied to a WPAN system, a sensing system, and the like that support UWB.