BTM Query Frame for Preserving Wi-Fi Roaming Agreements
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Solution Overview
Problem
Current Wi-Fi standards face challenges in ensuring seamless mobility with zero or low latency and packet losses during transitions between Access Point (AP) Multiple Links (MLDs) in different locations, failing to preserve critical agreements such as Security Configuration Settings (SCS), Time-Waiting TWT (TWT), and Peer-to-Peer TWT agreements during roaming.
Innovation Solution
An enhanced BSS roaming system that includes a BTM Query frame to request preservation of agreements and a BTM Request frame to recommend neighbor APs, allowing non-AP MLDs to transition while maintaining SCS, TWT, and P2P TWT agreements, with specific fields for each agreement type and a Neighbor Report element to confirm agreement preservation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If Wi-Fi devices transition between Access Point MLDs during roaming, then mobility and network coverage are improved, but packet losses and service disruptions occur due to loss of agreements
Solution Approach 1:
The patent applies preliminary action by having the non-AP MLD proactively indicate its intent to preserve agreements (SCS, TWT, P2P TWT) before the actual roaming transition occurs. The BTM Query frame is sent in advance to the target AP MLD, allowing the target to prepare for agreement preservation. This advance notification enables the target AP MLD to configure itself to maintain service continuity, thereby resolving the contradiction between fast roaming and reliable service transition.
2Device complexity
If traditional BSS transition protocol is used, then roaming process is simple, but critical agreements (SCS, TWT, P2P TWT) are not preserved during transition
Solution Approach 1:
The patent applies segmentation by dividing the agreement preservation mechanism into distinct components: separate indication fields for SCS agreement preservation, TWT agreement preservation, and P2P TWT agreement preservation in the BTM Query frame. Each agreement type is handled independently with specific fields (SCS Preservation Indication, TWT Preservation Indication, P2P TWT Preservation Indication), allowing selective preservation of different agreement types while maintaining overall protocol simplicity.
3Reliability
If agreement preservation fields are added to BTM frames, then service continuity is improved, but frame structure and processing complexity increase
Solution Approach 1:
The patent applies merging by combining multiple agreement preservation indications into a single BTM Query frame structure. The frame integrates SCS Preservation Indication, TWT Preservation Indication, and P2P TWT Preservation Indication fields along with Target AP MLD information elements, allowing the non-AP MLD to request preservation of all agreement types in one unified message rather than requiring separate frames for each agreement type.
Data Source
AI summary
This disclosure describes systems, methods, and devices related to enhanced BSS roaming. A device may generate a basic service set transition management (BTM) query frame comprising one or more fields. The device may include an indication of an intent to receive information from an associated AP, wherein the information is related to preserving one or more agreements with a target neighbor AP recommended by the associated AP. The device may cause to send the frame to the AP. The device may identify a BTM request frame received from the associated AP.