Multi-AP Association on NSTR Links to Reduce Self-Interference
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Solution Overview
Problem
The challenge of self-interference between non-simultaneous transmit/receive (NSTR) links in multi-band WiFi devices, which affects the reliability of data communication and system performance due to out-of-band interference and channel occupancy sensing issues.
Innovation Solution
The implementation of methods and apparatuses for multi-AP association on NSTR links, including a non-access point (AP) multi-band device (MBD) with stations (STAs) configured to form links with APs on different frequency bands, and a processor that manages associations and transmission procedures to mitigate self-interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a WiFi device operates on multiple frequency bands simultaneously using multi-link operation, then system performance and efficiency are improved, but self-interference between links increases due to out-of-band leakage
Solution Approach 1:
The device performs preliminary detection of NSTR conditions before initiating transmission on a link. By detecting whether another link is currently in reception mode and whether an NSTR relationship exists, the device can prevent harmful self-interference before it occurs, allowing multi-link operation to proceed with improved reliability
2Reliability
If transmission power is increased to improve communication reliability on one link, then signal strength is improved, but interference to other links increases
Solution Approach 1:
The device dynamically adjusts transmission parameters based on real-time detection of NSTR conditions. When an NSTR condition is detected, the device can modify transmission timing, power levels, or link selection to maintain communication reliability while minimizing interference to other links operating in reception mode
3Productivity
If a device transmits on one link, then data communication on that link is maintained, but the device becomes incapable of sensing channel occupancy on other links
Solution Approach 1:
The device performs preliminary detection of NSTR conditions before transmitting on a link. By checking whether another link is in reception mode and whether an NSTR relationship exists, the device can plan transmission timing to avoid compromising channel sensing capabilities on other links, ensuring both data communication and accurate channel occupancy measurement
Data Source
AI summary
Methods and apparatuses for facilitating multi-AP association on NSTR links. A method for wireless communication performed by a non-access point (AP) multi-band device (MBD), wherein the non-AP MBD comprises wireless stations (STAs), the method comprising: identifying, while a first STA of the STAs is associated with a first AP, that a second STA of the STAs is either associated or to be associated with a second AP; detecting a non-simultaneous transmit and receive (NSTR) condition; when the second STA is to be associated with the second AP, determining whether an association procedure to associate the second STA with the second AP is to be initiated based on a first MBD transmission procedure; and when the second STA is associated with the second AP, generating an indication to initiate a second MBD transmission procedure.