Multi-Link Channel Access via Trigger-Based Uplink
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Solution Overview
Problem
In wireless local area networks (WLANs), multi-link channel access is inefficient due to in-device coexistence interference (IDC) between frequency bands, leading to constraints on simultaneous transmission and reception, which hinders the utilization of multi-link capabilities.
Innovation Solution
Implementing a method where an access point (AP) sets up a primary and secondary link, configuring the secondary link for non-AP stations (STAs) with multi-link capability, allowing trigger-based uplink channel access and disabling contention-based access to avoid IDC interference, enabling efficient resource utilization without suspending backoff or performing internal collision resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the AP performs frame exchange with STAs on one link, then communication on that link is maintained, but other STAs cannot transmit on other links due to IDC interference constraints
Solution Approach 1:
The patent segments the multi-link operation into independent link operations, where each link can be accessed independently without forcing STAs to suspend backoff or perform internal collision resolution. This allows other STAs to transmit on other links even when the AP is performing frame exchange on one link, thereby resolving the contradiction between communication reliability and multi-link resource utilization
Solution Approach 2:
The patent introduces dynamic link selection and configuration mechanisms that allow the system to adaptively manage link access based on current communication needs. By dynamically configuring which links are available for transmission and reception, the system maintains reliable communication on active links while simultaneously allowing other STAs to utilize other links, thus resolving the contradiction
2Object-affected harmful factors
If STAs are forced to suspend backoff or perform internal collision resolution on links with IDC constraints, then IDC interference is avoided, but multi-link resource utilization becomes inefficient
Solution Approach 1:
The patent extracts the IDC interference constraint from the channel access mechanism by introducing separate backoff and collision resolution procedures for links with IDC constraints. Instead of forcing STAs to suspend backoff or perform internal collision resolution, the system allows independent channel access on each link while managing IDC interference through specific configuration and coordination mechanisms, thereby maintaining both interference avoidance and efficient resource utilization
Solution Approach 2:
The patent introduces an intermediary coordination mechanism where the AP manages link configuration and provides information to STAs about which links are subject to IDC constraints. This intermediary approach allows STAs to independently access channels without being forced to suspend backoff, while the AP coordinates to prevent actual interference, thus resolving the contradiction between interference avoidance and access efficiency
Data Source
AI summary
An apparatus (e.g., an access point (AP) establishes a plurality of links comprising a primary link and at least a secondary link. The apparatus transmits a management frame on the primary link to indicate a multi-link capability of the AP. The apparatus configures the secondary link for one or more non-AP stations (STAs), which are capable of operating on the primary link and the secondary link, with multi-link capability and operating parameters through an association procedure on the primary link.