NSTR Multi-Link rTWT Synchronization for Aligned Service Periods
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Solution Overview
Problem
Current rTWT implementations for Non-Simultaneous Transmit and Receive (NSTR) Multi-Link Devices (MLDs) are link-specific, preventing synchronization of Restricted Target Wake Time (rTWT) Service Periods (SPs) across different links, leading to inefficient use of NSTR links due to overlapping schedules.
Innovation Solution
An Access Point (AP) adjusts the start and/or duration of rTWT SPs on multiple links to synchronize their end times, allowing for aligned PPDU transmissions across NSTR links, thereby enhancing efficiency and power conservation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If rTWT SPs are implemented link-specific for NSTR MLDs, then each link can independently manage its service periods, but the service periods cannot be synchronized across different links leading to overlapping schedules and inefficient link usage
Solution Approach 1:
The patent merges the scheduling control of rTWT SPs across multiple links by introducing cross-link synchronization mechanisms. The AP coordinates SP start times and durations across different links to ensure they align, transforming independent link management into a coordinated multi-link operation that prevents overlapping schedules and improves overall link utilization.
2Productivity
If rTWT SPs are synchronized across NSTR links, then link utilization efficiency improves through aligned schedules, but the system complexity increases due to coordination requirements
Solution Approach 1:
The Access Point serves as an intermediary that centralizes the synchronization coordination. The AP receives SP requests from NSTR MLDs, calculates synchronized schedules across multiple links, and allocates non-overlapping time windows. This intermediary approach manages the complexity centrally rather than requiring distributed coordination between multiple devices.
Solution Approach 2:
The patent implements dynamic SP allocation where the AP adjusts SP start times and durations based on real-time link conditions and synchronization requirements. The scheduling is flexible and adaptive, allowing the system to optimize link utilization while maintaining synchronization constraints through dynamic parameter adjustment.
3Ease of operation
If NSTR links operate with overlapping schedules, then each link can operate independently, but power consumption increases due to extended wake-up times and simultaneous transmit-receive conflicts
Solution Approach 1:
The patent implements periodic, non-overlapping SP allocations across NSTR links where each link operates in synchronized time windows. During SP periods, links are activated for data transmission; between SP periods, links return to sleep mode. This periodic activation pattern reduces power consumption by ensuring STAs wake up only when needed and maintain clear transmit-receive separation.
Data Source
AI summary
Synchronizing restricted traffic window Service Periods (SPs) across bands for Non-Simultaneous Transmit and Receive (NSTR) stations may be provided. An Access Point (AP) may receive a first request for a first Restricted Target Wake Time (rTWT) SP from a Station (STA) on a first link established between the STA and the AP. The first request may include a first start time and a first duration of the first rTWT SP on the first link. The AP may receive a second request from the STA for a second rTWT SP on a second link established between the STA and the AP. The second request may include a second start time and a second duration of the second rTWT SP on the second link. The AP may adjust one of the first rTWT SP and the second rTWT SP to synchronize an end time of both the first rTWT SP and the second rTWT SP.