TDLS Channel Switching Coordination for NSTR Link Interference
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Solution Overview
Problem
In multi-link operation (MLO) wireless networks, the non-simultaneous transmit and receive (NSTR) constraint violation or overlap caused by Tunneled Direct Link Setup (TDLS) channel switching and link enablement is not harmoniously managed, leading to ineffective NSTR links due to signal interference.
Innovation Solution
The AP and non-AP multi-link devices (MLDs) employ methods and apparatuses to detect TDLS channel switching, send notification messages, and adjust frequency channels to avoid NSTR constraint violations by enabling or disabling links based on channel usage information, thereby preventing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If TDLS channel switching is performed in non-AP MLDs operating in NSTR mode, then peer-to-peer communication flexibility is improved, but NSTR constraint violations occur causing signal interference between links
Solution Approach 1:
The non-AP MLD performs preliminary detection of TDLS channel switching before actually switching channels. By detecting the channel switch intent in advance and notifying the AP MLD, the system can proactively prevent NSTR constraint violations by coordinating link states before interference occurs, rather than reacting after interference has already happened
Solution Approach 2:
The system implements a feedback mechanism where the non-AP MLD sends TDLS channel switch notification messages to the AP MLD, and the AP MLD responds with acknowledgments or coordination decisions. This closed-loop feedback enables real-time coordination between TDLS operations and NSTR link states, allowing the AP MLD to adjust link configurations based on TDLS channel switching activities to prevent interference
2Productivity
If multiple links are enabled in MLO for non-AP MLDs, then network throughput and reliability are improved, but NSTR constraint violations cause some links to become ineffective
Solution Approach 1:
The system dynamically adjusts link states based on real-time TDLS channel switching detection. The AP MLD can enable or disable specific links in response to TDLS channel switch notifications, creating a dynamic link configuration that adapts to prevent NSTR violations. This dynamic control ensures that links remain effective by coordinating their activation with TDLS channel operations
Solution Approach 2:
The AP MLD acts as an intermediary between TDLS operations and NSTR link management. By receiving TDLS channel switch notifications and coordinating link states, the AP MLD mediates between the desire to enable multiple links for high throughput and the need to prevent NSTR constraint violations, ensuring that link enablement decisions consider TDLS channel switching activities
Data Source
AI summary
Methods and apparatuses for facilitating avoidance of NSTR constraint violation caused by TDLS channel switching and link enablement in multi-link operation (MLO) in a wireless local area network. The methods include determining to switch a frequency channel used by a first tunneled direct link setup (TDLS) direct link from a first frequency channel to a second frequency channel, wherein the TDLS direct link is formed between a station (STA) of a non-access point (AP) multi-link device (MLD) and a corresponding peer STA, generating a TDLS channel switch notification message that includes an indication that the first TDLS direct link is switching from the first to the second frequency channel, and transmitting, to an AP MLD with which the non-AP MLD is associated, on an MLO link, the TDLS channel switch notification message, wherein MLO links are formed between STAs of the non-AP MLD and APs of the AP MLD.