RIS Steering Coordination for Seamless WLAN Roaming
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Solution Overview
Problem
Existing wireless local area network (WLAN) systems face challenges in seamlessly transitioning wireless clients between access points (APs) due to the static configuration of Reconfigurable Intelligent Surface (RIS) devices, which limits optimal signal steering and coverage optimization.
Innovation Solution
Implement coordinated steering techniques for RIS devices in a prioritized time-sliced manner between multiple APs to facilitate seamless roaming of wireless clients, optimizing communications by dynamically adjusting the phase of reflecting elements to enhance signal quality and coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If RIS devices use static configuration, then device complexity is reduced and ease of manufacture is improved, but signal steering optimization and coverage optimization deteriorate
Solution Approach 1:
The patent implements dynamic reconfiguration of RIS devices by allowing reflecting elements to change phase states in real-time based on client roaming events. The system transitions from static to dynamic configuration by enabling APs to send reconfiguration requests that adjust phase shifts according to current communication needs, thereby achieving optimal signal steering while maintaining manageable device complexity through automated control protocols
2Device complexity
If RIS devices use static configuration, then device complexity is reduced, but seamless roaming and signal quality during transitions deteriorate
Solution Approach 1:
The system performs preliminary reconfiguration actions by proactively adjusting RIS phase settings in response to roaming events before complete handover occurs. The source AP can trigger RIS reconfiguration to assist the target AP in acquiring the client, ensuring signal quality is maintained throughout the transition process and enabling seamless roaming without requiring complex manual intervention
3Reliability
If coordinated steering between multiple APs is implemented, then seamless roaming and signal quality are improved, but device complexity and system coordination requirements increase
Solution Approach 1:
The patent introduces a coordination mechanism where APs act as intermediaries to manage RIS reconfiguration. The source AP and target AP coordinate through standardized messaging protocols to jointly control the RIS device, with each AP able to send reconfiguration requests based on their respective needs. This intermediary approach enables seamless roaming through structured coordination while avoiding excessive system complexity by leveraging existing wireless management protocols
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances WLAN performance by ensuring smooth transitions and improved signal quality during client roaming, optimizing energy efficiency and spectrum utilization across multiple APs.
Implementation Method 1
An RIS device typically utilizes low-cost, passive phase shifting reflecting elements that allow the RIS device to reflect electromagnetic energy/waves through phase adjustments of the reflecting elements in order to direct the electromagnetic energy/waves in a particular direction
Data Source
AI summary
Provided herein are techniques through which coordinated steering of a Reconfigurable Intelligent Surface (RIS) device can be utilized according to prioritized time-slices determined for each of multiple wireless access points (APs) for a wireless local area network (WLAN). Coordinated steering of an RIS device by multiple wireless APs according to prioritized time-slices may facilitate seamless roaming for wireless clients between the wireless APs for the WLAN.