Wi-Fi Roaming Context Transfer for Reduced UL Transmission Pauses
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Solution Overview
Problem
The existing Wi-Fi 8 (IEEE 802.11bn) protocol for wireless networks experiences delays and errors during the roaming transient period due to the requirement of completing data transmission pauses and dynamic distribution system (DS) mapping changes, which do not align with current 802.11 specifications.
Innovation Solution
An enhanced data communication system that allows for the initiation of DS mapping change after the first frame exchange, enabling static context transfer without immediate DS mapping change, thereby reducing UL transmission pauses and minimizing errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DS mapping change is completed before frame exchange during roaming, then data transmission continuity is improved, but UL transmission pause time increases and errors occur due to misalignment with 802.11 specifications
Solution Approach 1:
The patent applies preliminary action by performing context transfer and DS mapping change before the actual frame exchange during roaming. The target AP MLD receives the context transfer frame from the current AP MLD, which contains all necessary context information, and completes the DS mapping change in advance. This ensures that when the non-AP MLD performs frame exchange with the target AP MLD, data transmission can continue without interruption or pauses, thereby improving reliability while avoiding time loss.
2Loss of time
If DS mapping change is initiated after first frame exchange, then UL transmission pause is reduced, but data continuity may be compromised
Solution Approach 1:
The patent resolves this contradiction by performing DS mapping change and context transfer as preliminary actions before frame exchange. The current AP MLD sends a context transfer frame to the target AP MLD containing all necessary context information (security credentials, QoS parameters, buffered data information). The target AP MLD processes this frame and completes DS mapping change in advance, ensuring both reduced UL transmission pause and maintained data continuity.
Solution Approach 2:
The context transfer frame acts as an intermediary carrier that transfers all necessary context information from the current AP MLD to the target AP MLD before the actual data transmission begins. This intermediary mechanism ensures that the target AP MLD has all required information to maintain data continuity while allowing UL transmission to proceed without pauses.
3Productivity
If context transfer is performed during roaming transition, then data communication speed is improved, but system complexity increases due to additional frame processing
Solution Approach 1:
The patent applies merging by combining the context transfer process with the existing roaming transition framework. The context transfer frame is integrated into the standard 802.11 protocol structure, and the DS mapping change is performed as part of the normal roaming sequence. This merging approach allows the system to achieve faster data communication during roaming without significantly increasing overall system complexity, as the additional processing is embedded within existing protocol structures rather than requiring separate independent mechanisms.
Data Source
AI summary
This disclosure describes systems, methods, and devices related to enhanced data communication. A device may receive a request frame from a non-access point multi-link device (non-AP MLD) to initiate context transfer. The device may process the execution request frame to determine context transfer requirements based on indications within the frame. The device may transmit a response frame to the non-AP MLD, after finishing context transfer based on the context transfer requirements.