Multi-Link Roaming Power Control for Stable Wireless Link Transition
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Solution Overview
Problem
Existing link transition methods in wireless communication, such as seamless roaming and fast basic service set transition, do not adequately address the reliability and stability of new links established between a station (STA) and a target access point (AP) during roaming, leading to potential interruptions in data transmission.
Innovation Solution
A method involving power control information transmission during link transition by a multi-link device (MLD) to adjust the transmit power of candidate access point (AP) MLDs, ensuring reliable and stable link establishment through soft transitioning, which maintains connections with the source AP while establishing new links with the target AP.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing link transition methods (seamless roaming, fast BSS transition) are used, then roaming capability is provided, but reliability and stability of new links are insufficient leading to data transmission interruptions
Solution Approach 1:
The patent applies preliminary action by having the STA MLD obtain power control information for candidate AP MLDs before actually performing link transition. This allows the STA to pre-calculate appropriate transmit power values and pre-establish power control parameters, ensuring that when the link transition occurs, the new link can immediately operate at optimal power levels without interruptions or reliability issues.
Solution Approach 2:
The patent implements feedback mechanisms where the STA MLD receives power control information from the source AP MLD about candidate AP MLDs, uses this information to calculate appropriate transmit power, and then applies this power control during link transition. This feedback loop ensures that power levels are continuously optimized based on actual link conditions, improving both reliability and preventing data transmission interruptions.
2Reliability
If transmit power is increased to improve link stability, then link reliability improves, but interference to other links increases
Solution Approach 1:
The patent applies local quality by enabling each AP MLD to have independent, optimized power control settings based on its specific characteristics and position. The STA MLD receives power control information specific to each candidate AP MLD and calculates appropriate transmit power values tailored to each link's requirements. This allows each link to operate at the minimum necessary power level for reliable communication, improving link stability while minimizing interference to other links through localized power optimization.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting transmit power values based on received power control information and calculated path losses. Instead of using fixed or maximum power levels, the system continuously optimizes power parameters for each link based on actual communication conditions, ensuring sufficient link stability while reducing unnecessary interference caused by excessive power transmission.
Data Source
AI summary
Provided is a method for link transition. The method is performed by a station (STA) multi-link device (MLD), and includes: receiving power information of each of candidate access point (AP) MLDs; and transmitting power control information in a process of transitioning a first source link to a first target link.