Non-STR Multi-Link Channel Access with Synchronization Delay
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Multi-link devices with non-simultaneous transmitting and receiving capability (non-STR MLDs) experience channel interference and blind states due to signal transmission on one frequency band affecting reception on another, leading to inefficient channel access.
Innovation Solution
Implementing a medium synchronization delay mechanism with conservative channel access methods, including lower energy detection thresholds and restricted channel access on affected links, to mitigate interference and improve channel access efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a non-STR MLD performs transmission on one link, then transmission rate is improved, but channel access on another link is affected due to interference
Solution Approach 1:
The device performs preliminary channel assessment and identifies potential interference conditions before transmission begins. By detecting the frequency spacing between links and assessing channel conditions in advance, the device can proactively adjust its transmission strategy to prevent interference-related failures, thereby maintaining both high transmission rates and reliable channel access.
Solution Approach 2:
The channel access mechanism dynamically adapts based on real-time channel conditions and interference assessments. The device adjusts transmission parameters, selects appropriate access methods, and modifies operating strategies according to the detected frequency spacing and channel state, enabling flexible optimization of both transmission rate and channel access reliability under varying conditions.
2Device complexity
If frequency spacing between links is small, then device complexity is reduced, but signal transmission on one link causes channel interference to another link
Solution Approach 1:
The device converts the potentially harmful effect of frequency proximity into a beneficial assessment mechanism. By using the small frequency spacing as a criterion for identifying links that require coordinated channel access, the system transforms what would be a source of interference into a trigger for protective channel assessment and coordinated transmission strategies, ultimately improving overall system reliability.
Solution Approach 2:
The channel assessment mechanism acts as an intermediary between transmission operations on different links. It evaluates the frequency spacing and channel conditions, then mediates the transmission decisions to prevent interference, allowing the system to maintain simple frequency configurations while avoiding harmful interference effects through intelligent coordination.
3Productivity
If the non-STR MLD is in a blind state on some links, then channel access opportunities are reduced, but allowing simultaneous transmission and reception would cause mutual interference
Solution Approach 1:
The device performs preliminary assessment of channel conditions and interference potential before entering transmission states. By evaluating the STR capability and assessing channel conditions in advance, the device can proactively determine whether to allow simultaneous transmission and reception or to implement protective blind states, thereby minimizing unnecessary productivity loss while preventing harmful mutual interference when it would occur.
Solution Approach 2:
The channel access mechanism dynamically adjusts the blind state duration and simultaneous transmission/reception permissions based on real-time channel conditions and device capabilities. The system transitions between restrictive and permissive states according to detected interference levels and STR capability, optimizing channel access efficiency while preventing mutual interference under varying operational conditions.
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
This application relates to the field of wireless communication, for example, being applied to a wireless local area network supporting the 802. 1 1be standard, and in particular, relates to a channel access method for a multi-link device and a related apparatus. The method includes: when a length of a first PPDU transmitted on a first link by a first multi-link device is less than or equal to a first value, skipping starting, by the first multi-link device, a medium synchronization delay timer on a second link, where the first multi-link device is not allowed to perform simultaneous transmitting and receiving on the first link and the second link. In embodiments of this application, channel access efficiency can be improved when a non-STR MLD is in a blind state/self-interference state.