Multi-Link Path Measurement for Reliable Time-Sensitive Wi-Fi
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Solution Overview
Problem
Existing Wi-Fi systems face challenges in maintaining transmission reliability for time-sensitive traffic due to limited reliability in single communication links, which can be exacerbated by interference or congestion, leading to blocked traffic or delayed switching to alternative links.
Innovation Solution
Implementing service-based transmission path measurement in multi-link enhanced service set networks, utilizing a non-AP MLD to transmit and receive ML measurement request and response messages to gather QoS information across multiple paths, enabling real-time path selection and duplication of data packets to ensure reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single communication link is used between STA and AP, then the network structure is simple, but the transmission reliability is limited and cannot guarantee time-sensitive traffic
Solution Approach 1:
The patent segments the communication path into multiple independent links (first link and second link) with different characteristics. Each link can be selected or switched based on real-time QoS conditions, allowing the system to maintain reliability without requiring a completely complex network structure. The segmentation enables parallel transmission paths that can be activated as needed.
Solution Approach 2:
The patent introduces dynamic path selection and switching mechanisms that adapt the network topology based on real-time conditions. The system dynamically switches between different links or adjusts transmission parameters according to measured QoS metrics, transforming a static single-link structure into a dynamic multi-path system that maintains simplicity while improving reliability.
2Reliability
If the wireless communication link is congested or interfered, then the transmission reliability decreases, but switching to another AP takes hundreds of milliseconds causing traffic blockage
Solution Approach 1:
The patent performs preliminary QoS measurement and path evaluation before actual data transmission begins. By pre-measuring link characteristics and pre-establishing multiple available paths, the system avoids the need for slow on-demand switching during congestion. The preliminary actions include measuring QoS parameters and preparing alternative paths in advance.
Solution Approach 2:
The patent implements continuous QoS measurement and feedback mechanisms that monitor link performance in real-time. The measured information feeds back to the path selection logic, enabling automatic adjustment without manual intervention or lengthy switching procedures. This feedback loop allows the system to respond to congestion quickly by switching to alternative paths based on real-time conditions.
3Reliability
If real-time QoS measurement is implemented across multiple links, then transmission reliability improves, but the measurement and control mechanism complexity increases
Solution Approach 1:
The patent designs a universal QoS measurement mechanism that serves multiple functions: path selection, performance monitoring, congestion detection, and load balancing. By making the measurement system multi-functional, the patent reduces overall complexity compared to having separate specialized systems for each function. The same measurement infrastructure supports multiple operational needs.
Solution Approach 2:
The patent merges QoS measurement functions with existing path management and control mechanisms rather than creating entirely separate systems. The measurement results are integrated into the existing path selection and switching logic, combining multiple functions into unified processing flows. This merging approach reduces complexity by eliminating redundant structures.
4Productivity
If traffic is distributed across multiple links, then transmission reliability and load balancing improve, but the control and management overhead increases
Solution Approach 1:
The patent implements self-service mechanisms where the system automatically performs load balancing and path selection based on measured QoS conditions without requiring complex external control. The STA or AP autonomously evaluates link conditions and adjusts traffic distribution accordingly, reducing the need for centralized management complexity. The system serves itself by making intelligent decisions based on real-time measurements.
Data Source
AI summary
Techniques pertaining to service-based transmission path measurement for multi-link (ML) enhanced service set (ESS) networks in wireless communications are described. A non-access point (non-AP) multi-link device (MLD) transmits an ML measurement request message and receives an ML measurement response message. The ML measurement response message indicates quality of service (QoS) measurement information on one or more links within each of one or more transmission paths of a plurality of transmission paths from an associated non-AP MLD in an ML ESS network with a single-point association.