Multi-Link Wi-Fi Access for Low-Latency Traffic Scheduling
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Solution Overview
Problem
Existing wireless networks face challenges in efficiently handling low latency traffic due to contention-based channel access mechanisms, which can lead to increased latency and collisions, particularly in scenarios involving multiple stations with varying bandwidth capabilities.
Innovation Solution
Implementing a multi-link device (MLD) that includes a processor and transmitter/receiver configured to manage traffic restriction information across multiple wireless links, allowing stations to transmit low latency data based on received traffic restriction information, thereby optimizing channel access for low latency requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If contention-based channel access (CSMA/CA) is used in wireless networks, then multiple stations can share the channel, but latency increases and collisions occur for low latency traffic
Solution Approach 1:
The patent segments the wireless network into multiple independent links, each capable of carrying low latency traffic. By dividing the network into separate transmission paths (links), low latency traffic can be transmitted simultaneously across multiple links without contending for the same channel resources, thereby reducing latency while maintaining channel sharing capability for other traffic types.
2Productivity
If multiple stations transmit simultaneously on the same channel, then channel utilization increases, but collisions increase and reliability decreases
Solution Approach 1:
The patent introduces a new dimension for traffic differentiation by creating separate logical links within the wireless network. Instead of allowing all stations to contend for the same channel dimension, low latency traffic is routed through dedicated links, separating it from other traffic types. This dimensional separation allows high channel utilization overall while ensuring reliable transmission for time-sensitive traffic by eliminating collision risks for that specific traffic class.
3Loss of time
If deterministic channel access is implemented for low latency traffic, then latency is reduced, but device complexity increases
Solution Approach 1:
The patent implements a multi-functional channel access mechanism where the same wireless infrastructure and protocol stack can handle both traditional contention-based traffic and deterministic low latency traffic. The system maintains compatibility with existing 802.11 protocols while adding deterministic access capabilities through the link-based architecture, allowing a single system to serve multiple traffic types without requiring completely separate hardware or protocol implementations.
Data Source
AI summary
Methods and device are disclosed for station (STA) multi-link device (MLD) or non-access point (Non-AP) STA affiliated with a first STA and second STA. The first STA receives from a first access point (AP) affiliated with an AP MLD, on a first wireless link, a frame indicating traffic restriction information associated the first wireless link and a second wireless link. The second wireless link is configured for communication between a second STA affiliated with the STA MLD and a second AP affiliated with the AP MLD. Data having a low latency requirement are transmitted on at least one or more of the first and the second wireless links based on the received traffic restriction information. Corresponding methods and devices for an AP MLD are also disclosed.