NSTR MLD Shared TXOP Coordination for IDC Interference
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Solution Overview
Problem
Current IEEE 802.11 WLAN protocols face challenges in sharing transmit opportunities (TXOP) during multi-link operations, leading to increased contention and delays due to in-device coexistence interference, especially in non-simultaneous transmit/receive (NSTR) multi-link devices (MLDs).
Innovation Solution
The protocol allows for sharing TXOPs among NSTR MLDs at the MLD level, enabling synchronized transmission and reception across different links, and permits the shared TXOP holder to initiate channel access once all links of a NSTR link pair are obtained, regardless of affiliation, to reduce IDC interference and improve channel access efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If TXOP sharing is implemented among NSTR MLDs at the MLD level, then channel utilization efficiency is improved and delays are reduced, but device complexity increases due to synchronized transmission and reception requirements across multiple links
Solution Approach 1:
The patent merges multiple link operations into a unified MLD-level TXOP sharing mechanism. Stations affiliated with the same NSTR MLD on different links perform synchronized transmission and reception under a single TXOP holder, combining resources across links to improve channel utilization while managing complexity through centralized coordination at the MLD level
Solution Approach 2:
The patent segments the TXOP sharing mechanism into distinct operational modes: synchronized operation for stations affiliated with the same NSTR MLD, and independent operation for stations from different MLDs. This segmentation allows the system to achieve high efficiency when conditions permit while maintaining simplicity when they don't, resolving the complexity-efficiency tradeoff
2Reliability
If all links of a NSTR link pair must be obtained by stations affiliated with the same NSTR MLD for shared TXOP, then IDC interference is eliminated, but channel access speed is reduced
Solution Approach 1:
The patent introduces dynamic operation modes that adapt to the affiliation status of stations. When all links are obtained by stations from the same NSTR MLD, synchronized mode is activated for maximum reliability. When links are obtained by stations from different MLDs, independent mode is activated for faster access, while still allowing TXOP sharing. This dynamic approach resolves the contradiction between reliability and speed
Solution Approach 2:
The patent changes the affiliation parameter from a strict requirement to a conditional factor. Instead of requiring all stations to be from the same NSTR MLD, the system allows TXOP sharing regardless of affiliation, adjusting the synchronization parameter based on whether stations are from the same or different MLDs. This parameter change enables faster channel access while maintaining acceptable reliability
3Reliability
If synchronized transmission and reception is enforced for all NSTR MLD stations, then IDC interference is avoided, but ease of operation is reduced due to stricter channel access requirements
Solution Approach 1:
The patent segments the operation requirements based on station affiliation. Stations affiliated with the same NSTR MLD must perform synchronized transmission and reception, while stations from different MLDs can operate independently. This segmentation makes the system easier to operate by providing flexible access rules while maintaining reliability through synchronization where needed
Solution Approach 2:
The patent enables stations to determine their own operational mode based on their affiliation status and the current channel access situation. Each station can autonomously decide whether to participate in synchronized or independent operation, reducing the need for complex centralized control and improving ease of operation while maintaining reliability
Data Source
AI summary
Enhanced Multi-Link Operation (MLO) is performed in this protocol in which non-simultaneous transmit/receive (NSTR) Multi-Link Devices (MLDs) cooperate with each other in sharing a portion of their available Transmit Opportunity (TXOP) toward reducing contention and competition for channel access across the group of cooperating MLDs. The shared TXOP is performed at an MLD level after all links for an NSTR MLD are obtained by stations which do not need to be in part of the same NSTR MLD, thus synchronized transmissions and receptions are performed which eliminate in-device coexistence (IDC) interference in any single NSTR MLD. The time gap while awaiting for all links to be obtained, is also made use of for performing transmission(s) toward increasing data throughput.