AP MLD Channel Switching with Pre-Signaled Parameters
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Solution Overview
Problem
Existing wireless communication systems, particularly those utilizing multi-link operation (MLO), face challenges in efficiently managing channel switches and parameter transitions for access point (AP) and non-AP multi-link devices (MLDs), leading to increased latency, reduced quality of service, and potential management traffic storms during channel transitions.
Innovation Solution
AP MLDs transmit beacons indicating future channel switch parameters, allowing non-AP MLDs to prepare and adjust their settings in advance, thereby reducing latency and improving the efficiency of channel switching processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If channel switching is performed without pre-signaling parameters, then the channel transition can occur quickly, but latency increases and quality of service deteriorates due to lack of preparation time
Solution Approach 1:
The patent applies preliminary action by having the AP MLD transmit beacon frames that indicate future channel switch parameters (such as new channel number, bandwidth, and other operational parameters) before the actual channel switch occurs. This allows non-AP MLDs to receive advance notification and prepare their configurations in advance, reducing switching latency while maintaining quality of service through proper preparation.
2Loss of time
If channel switch parameters are pre-signalized in beacon frames, then quality of service improves and latency reduces, but device complexity increases due to additional signaling requirements
Solution Approach 1:
The patent utilizes existing beacon frames, which are already part of the standard 802.11 protocol for wireless communication, to carry additional channel switch parameter information. By making the beacon frame multi-functional (carrying both regular beacon information and future channel switch parameters), the patent avoids creating entirely new signaling mechanisms, thereby reducing the increase in device complexity while still achieving pre-signalization benefits.
3Ease of operation
If all MLDs switch channels simultaneously without coordination, then the switching process is simple, but management traffic storms occur and system reliability decreases
Solution Approach 1:
The patent implements feedback mechanisms where the AP MLD announces future channel switch parameters in beacon frames, allowing non-AP MLDs to report their readiness status or configuration requirements. This coordinated feedback loop enables the AP MLD to manage the channel switching process systematically, preventing simultaneous uncoordinated switches that could cause traffic storms, while still maintaining operational simplicity through standardized procedures.
Data Source
AI summary
Methods, systems and apparatuses for performing a channel switch by an access point (AP) multi-link device (MLD) and non-AP MLD are described. An AP MLD may transmit information about parameters of an AP that will be implemented following an upcoming channel switch. The non-AP MLD may use the information to implement the channel switch.