Block ACK Session Transfer for Seamless AP Roaming
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Solution Overview
Problem
Existing wireless networks face challenges in seamless handover of block acknowledgement (BA) sessions during roaming, leading to disruptions and increased latency in delay-sensitive applications like augmented reality and robotics.
Innovation Solution
Implementing a system where a first access point (AP) in a wireless network transfers a block acknowledgement (BA) session and related parameters to a second AP when a station (STA) roams, allowing the STA to transition between APs without terminating and re-setting up the BA session.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a station (STA) roams from one access point (AP) to another in existing wireless networks, then the STA can maintain mobility and access different coverage areas, but the block acknowledgement (BA) session must be terminated and re-setup, causing latency increases and disruptions in delay-sensitive applications
Solution Approach 1:
The patent applies preliminary action by transferring the BA session parameters from the source AP to the target AP before the STA completes its roaming process. The source AP sends the BA session information (including buffer status, sequence numbers, and acknowledgment state) to the target AP in advance, so that when the STA roams, the target AP is already prepared to continue the BA session without interruption. This pre-positioning of critical session data eliminates the need to terminate and re-setup the BA session during roaming.
Solution Approach 2:
The patent uses the source AP as an intermediary to facilitate the BA session transfer. The source AP receives the BA session parameters from the STA, processes them, and forwards them to the target AP. This intermediary role allows the BA session state to be transferred seamlessly between APs without requiring the STA to re-establish the session, thereby maintaining session continuity and reducing roaming latency.
2Productivity
If a BA session is terminated and re-setup during roaming, then the STA can associate with the new AP, but the throughput decreases and latency increases for delay-sensitive applications like augmented reality and robotics
Solution Approach 1:
The patent applies preliminary action by pre-transferring the BA session parameters from the source AP to the target AP before the roaming completion. This ensures that when the STA associates with the new AP, the target AP already has the necessary session information (buffer status, sequence numbers, acknowledgment state) to immediately continue data transmission without interruption. This eliminates the session re-setup time and maintains high throughput for delay-sensitive applications.
3Reliability
If the BA session parameters are transferred between APs, then seamless roaming is achieved, but the complexity of the AP communication and parameter management increases
Solution Approach 1:
The patent uses the source AP as an intermediary to manage the complexity of BA session parameter transfer. The source AP collects the session parameters from the STA, processes them into a standardized format, and forwards them to the target AP. This intermediary approach centralizes the complexity management at the source AP, which already has the session information, thereby simplifying the overall system architecture while achieving seamless roaming.
Solution Approach 2:
The patent applies universality by designing the BA session parameter transfer mechanism to work across different APs and roaming scenarios. The same parameter structure and transfer protocol are used regardless of the specific APs involved or the type of roaming (horizontal, vertical, or inter-controller). This universal approach standardizes the complexity management and makes the system scalable.
4Loss of time
If existing wireless networks handle roaming without BA session transfer, then the system complexity remains low, but delay-sensitive applications suffer from disruptions and increased latency
Solution Approach 1:
The patent applies preliminary action by transferring the BA session parameters from the source AP to the target AP before the STA completes its roaming process. This pre-positioning of critical session data ensures that when the STA roams, the target AP is already prepared to continue the BA session without interruption, thereby eliminating latency spikes and maintaining session continuity for delay-sensitive applications.
Data Source
AI summary
A first access point (AP) in a wireless network transfers a block acknowledgment (BA) session and related parameters of a station (STA) to a second AP when the STA roams from the first AP to the second AP, allowing the STA to roam between APs without needs to terminate and re-setup up the BA session.