Multi-Link Wireless Channel Access for NSTR Collision Avoidance
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Solution Overview
Problem
Nonsimultaneous Transmit and Receive (NSTR)-based interference or collision occurs on primary and non-primary links in soft Access Point Multi-Link Devices (AP MLDs), leading to communication disruptions.
Innovation Solution
Limit and constrain the transmission opportunities (TXOPs) of Non-AP STAs and APs on primary and non-primary links to ensure synchronized and aligned end times of Physical Layer Protocol Data Units (PPDUs) transmission, using predefined time deviations and acknowledgment mechanisms to prevent interference or collision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Non-AP STAs and APs transmit PPDUs simultaneously on primary and non-primary links without constraint, then communication efficiency is improved, but NSTR-based interference or collision occurs
Solution Approach 1:
The patent applies preliminary action by establishing TXOP constraints and time deviation thresholds before simultaneous transmissions occur. The AP configures time deviation thresholds in advance, and Non-AP STAs prepare their TXOP durations according to these pre-set constraints, ensuring that transmissions are coordinated to avoid NSTR interference from the outset rather than reacting to conflicts after they occur.
Solution Approach 2:
The patent changes the parameter of TXOP duration to resolve the contradiction. By constraining the TXOP duration of Non-AP STAs on non-primary links relative to the AP's TXOP on the primary link (ensuring the Non-AP STA's TXOP ends no later than the AP's TXOP plus a time deviation threshold), the system enables simultaneous transmissions while preventing NSTR-based interference through parameter control.
2Reliability
If TXOP durations are constrained to prevent NSTR interference, then transmission reliability is improved, but transmission flexibility is reduced
Solution Approach 1:
The patent applies dynamics by making the TXOP constraint adaptive rather than fixed. The time deviation threshold can be configured based on different scenarios and requirements, allowing the system to adjust the degree of constraint dynamically. This enables the system to maintain reliability through constraints while preserving flexibility by allowing different time deviation thresholds for different transmission scenarios.
Data Source
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AI summary
Provided in the embodiments of the present application are a method and device for wireless communication. According to channel access features of an NSTR AP MLD in a primary link and a secondary link, a channel access method based on a specific rule and a channel access scheme based on a synchronous medium access latency are designed, so as to prevent transmission performed by the NSTR AP MLD in the primary link and in the secondary link from experiencing an NSTR-based interference or collision.