Multi-AP Channel Sounding Coordination for Reliable Wireless Links
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Solution Overview
Problem
Access point multi-link device (AP MLD) capabilities are inadequate to meet transmission requirements, particularly in environments with intense AP deployment and signal interference, leading to challenges in providing high-reliability, high-rate, and low-latency communication.
Innovation Solution
Implementing multi-AP MLD coordinated transmission, joint channel sounding, data sharing, and seamless roaming through the use of multi-AP MLD sounding announce frames, NDPA frames, and sounding trigger frames to coordinate channel sounding and data transmission among multiple APs and non-APs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional single-AP transmission is used, then device complexity is low, but transmission reliability and rate are insufficient in high-density AP environments
Solution Approach 1:
The patent combines multiple AP MLDs into a virtual AP MLD that performs coordinated transmission together. Multiple physical APs are merged into a single logical entity that shares resources and coordinates their transmissions, thereby improving reliability through diversity while managing complexity through unified control architecture.
Solution Approach 2:
The virtual AP MLD performs multiple functions including coordinated transmission, channel sounding, data sharing, and seamless roaming across multiple links. This multi-functionality allows a single virtual entity to handle diverse transmission scenarios, improving system capability without proportionally increasing complexity.
2Productivity
If multi-AP MLD coordinated transmission is implemented, then transmission rate and reliability are improved, but channel sounding coordination complexity increases
Solution Approach 1:
The system performs channel sounding in advance before actual data transmission. By pre-establishing channel state information through sounding procedures, the virtual AP MLD can optimize transmission parameters beforehand, enabling higher transmission rates while simplifying real-time coordination through pre-computed channel characteristics.
Solution Approach 2:
The patent implements feedback mechanisms where AP MLDs exchange channel state information and transmission status. This feedback loop enables dynamic adjustment of transmission parameters based on actual channel conditions, improving transmission rate while managing coordination complexity through automated adaptive control.
3Adaptability or versatility
If data sharing across multiple links is enabled, then system adaptability is improved, but control complexity increases
Solution Approach 1:
The virtual AP MLD dynamically selects which links to activate for data sharing based on current channel conditions and traffic requirements. This dynamic link selection enables flexible data sharing across multiple links while managing control complexity through on-demand activation rather than managing all links simultaneously.
Solution Approach 2:
The patent segments the data sharing function into separate link-level operations coordinated by the virtual AP MLD. Each link can independently handle data sharing tasks while the virtual entity coordinates overall resource allocation, thereby enabling multi-link adaptability while reducing centralized control complexity through modular operation.
4Ease of operation
If seamless roaming is implemented, then user experience is improved, but transition time management complexity increases
Solution Approach 1:
The system performs channel sounding and connection establishment in advance before actual roaming occurs. By pre-establishing alternative links and preparing handover parameters, the virtual AP MLD enables seamless roaming experience while reducing actual transition time through pre-prepared connection resources.
Solution Approach 2:
The virtual AP MLD acts as an intermediary that manages the roaming transition between different physical links. It coordinates the handover process by mediating between the user equipment and multiple underlying links, thereby achieving seamless roaming experience while simplifying transition time management through centralized coordination.
Data Source
AI summary
A wireless communication method and a device are provided. A first access point multi-link device (AP MLD) sends or receives a multi-AP MLD sounding announce frame. The multi-AP MLD sounding announce frame indicates at least one of: a sequence in which a plurality of AP MLDs perform channel sounding, a time at which the plurality of AP MLDs perform channel sounding, information of links used for the plurality of AP MLDs to perform channel sounding, information of a frequency band used for the plurality of AP MLDs to perform channel sounding, or information of a channel corresponding to the links and/or the frequency band used for the plu