Access Point r-TWT Schedule Coordination for Interference Reduction
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Solution Overview
Problem
Current wireless communication systems face challenges in coordinating restricted target wake-up time service periods (r-TWT SP) among multiple access points (APs), leading to inefficiencies and interference, particularly in latency-sensitive applications like cloud gaming and AR glasses.
Innovation Solution
The system announces and coordinates r-TWT SP information among APs and client stations (STAs) through management frames like beacon or action frames, allowing APs to adjust their transmission periods to avoid overlaps and optimize medium use, enabling efficient frame exchange and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple access points transmit frames during overlapping r-TWT service periods, then medium utilization increases, but interference between APs increases and latency requirements cannot be guaranteed
Solution Approach 1:
The patent segments the wireless medium access by dividing APs into different groups (first set and second set) that operate on different r-TWT schedules. This segmentation allows simultaneous transmissions in different temporal segments without interference, effectively increasing overall medium utilization while maintaining latency guarantees for each group.
Solution Approach 2:
The patent implements dynamic r-TWT schedule adjustment where APs can modify their service periods based on network conditions and coordination with neighboring APs. This dynamic approach allows the system to adaptively optimize medium utilization while preventing interference through real-time schedule coordination.
2Reliability
If access points coordinate r-TWT service periods to avoid interference, then latency requirements are met, but medium efficiency decreases due to reduced overlapping transmissions
Solution Approach 1:
The patent employs periodic r-TWT service periods with different phases for different AP groups. By staggering the periodic transmissions of first and second sets of APs, the system ensures that latency-sensitive transmissions occur during dedicated time windows (guaranteeing reliability) while other time windows can be utilized by different groups (maintaining medium efficiency).
Solution Approach 2:
The patent implements preliminary coordination mechanisms where APs exchange r-TWT schedule information before transmissions begin. This preliminary action allows APs to pre-coordinate their service periods to minimize interference while maximizing medium utilization, ensuring latency requirements are met without excessive restrictions on overall efficiency.
3Object-affected harmful factors
If access points announce r-TWT service period information to all STAs, then interference reduction is achieved, but message overhead and processing complexity increase
Solution Approach 1:
The patent applies local quality by having APs announce r-TWT service period information selectively to STAs that are relevant to their transmission schedules. Instead of universal announcements to all STAs in the network, each AP provides information tailored to its local neighborhood and coordination requirements, reducing overall message overhead while maintaining interference reduction benefits.
4Object-affected harmful factors
If access points restrict transmission to non-overlapping r-TWT service periods, then interference is minimized, but channel access opportunities for STAs are reduced
Solution Approach 1:
The patent merges the channel access opportunities of multiple STAs associated with different AP groups by coordinating their r-TWT schedules. When first set APs are transmitting, second set STAs can access the channel, and vice versa. This merging approach ensures that while interference is minimized through non-overlapping AP transmissions, overall channel access time for STAs is maximized through coordinated parallel access in different time segments.
Data Source
AI summary
An AP receives a frame comprising an indication of a restricted target wake up time schedule service period (r-TWT SP) from a wireless device. The AP one or more of adjusts an r-TWP SP of the AP based on the indication of the r-TWT SP indicated in the received frame and announcing that an STA associated with the AP is to terminate a transmit opportunity (TXOP) before the r-TWT SP indicated in the received frame begins.