BSS Resource Reservation for TSN Scalability
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Solution Overview
Problem
Current Restricted Target Wake Time (r-TWT) implementations have limitations in Time-Sensitive Networking (TSN) with gate constructs, such as too large granularity of Quiet Elements (QEs) and beacon intervals, which do not scale for enterprise and IoT devices.
Innovation Solution
The proposed solution involves Basic Service Set (BSS) resource reservations, where an Access Point (AP) determines a time window for a Station (STA) to transmit, and transmits a reservation scheduling frame to claim channel access, inform the STA of the time window, and reserve the channel for a defined duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If r-TWT implementations use Quiet Elements (QEs) and beacon intervals for time slot reservation, then power-saving mechanisms are enabled, but the granularity is too large and does not scale for enterprise and IoT devices
Solution Approach 1:
The patent segments the time reservation mechanism by introducing a new frame structure with transmission opportunity (TXOP) allocations that operate independently of the traditional beacon interval and Quiet Element structure. This allows time slots to be divided into smaller, more granular units that can be precisely allocated to individual STAs without being constrained by large beacon intervals, thereby improving measurement precision while maintaining scalability for enterprise and IoT devices
Solution Approach 2:
The patent implements dynamic time slot allocation where the AP can flexibly adjust TXOP durations and scheduling based on real-time network conditions and STA requirements. This dynamic approach replaces the static, coarse-grained beacon interval structure with adaptive, fine-grained time allocations that can be optimized for different application scenarios, resolving the contradiction between granularity and scalability
2Ease of operation
If larger beacon intervals and Quiet Elements are used in r-TWT, then power-saving mechanisms are simplified, but interference prevention becomes less effective due to coarse time slot boundaries
Solution Approach 1:
The patent applies preliminary action by having the AP send reservation scheduling frames that explicitly reserve TXOPs before the actual data transmissions occur. This advance reservation mechanism prevents interference by establishing clear time boundaries in advance, allowing STAs to know exactly when they can transmit without worrying about collisions, thus providing effective interference prevention while maintaining operational simplicity
Solution Approach 2:
The patent introduces reservation scheduling frames as an intermediary mechanism between the AP and STAs for coordinating transmissions. These frames serve as a mediator that establishes binding agreements on time slot allocations, preventing interference by ensuring all parties adhere to the scheduled transmission opportunities, thereby resolving the contradiction between ease of operation and interference prevention
Data Source
AI summary
Basic Service Set (BSS) resource reservation may be provided. BSS resource reservation may include determining a time window for a to accommodate a transmission of a target Station (STA) in a BSS, wherein the BSS further comprises one or more other STAs. An AP may then transmit a reservation scheduling frame, to claim access of a channel, inform the target STA of the time window, and reserve the channel for a duration defined by the time window.