Multi-AP Trigger Frame Signaling for Coordinated TXOP Sharing
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Solution Overview
Problem
Existing IEEE 802.11be triggered TXOP sharing procedure is limited to associated STAs and does not support multi-AP operations effectively, necessitating improved signaling mechanisms for coordinated TDMA, OFDMA, and special reuse modes.
Innovation Solution
Extension of IEEE 802.11ax and 802.11be Trigger frames to facilitate signaling for multi-AP operations by incorporating new or modified trigger frames that signal allocated time, mode of operation, differentiate between multi-AP and P2P procedures, and manage parameters like Tx power limits and PPDU alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the existing IEEE 802.11be triggered TXOP sharing procedure is used, then associated STAs can share TXOP, but multi-AP operations are not supported
Solution Approach 1:
The trigger frame is extended to serve multiple functions: it not only triggers associated STAs but also supports multi-AP operations through new fields (Multi-AP mode indicator, allocated AP list, time allocation information). This allows a single frame type to handle both traditional STA-triggered TXOP sharing and the new multi-AP coordinated operations, achieving versatility without requiring entirely new frame formats.
Solution Approach 2:
The trigger frame is segmented into multiple information fields, each serving specific purposes: trigger duration, allocated AP list, time allocation information, and multi-AP mode indicator. This segmentation allows the complex multi-AP signaling to be broken down into manageable components that can be processed independently by receiving devices, reducing the effective complexity despite the enhanced functionality.
2Adaptability or versatility
If trigger frames are extended to support multi-AP operations, then coordinated TDMA/OFDMA/special reuse modes are enabled, but frame format complexity increases
Solution Approach 1:
The trigger frame format is made dynamic rather than static - the same basic frame structure adapts to different operational modes (TDMA, OFDMA, special reuse) through optional fields and variable-length parameters. The Multi-AP mode indicator field dynamically selects which allocation mechanisms are activated, allowing the frame to change its effective structure based on the specific coordinated operation being performed.
Solution Approach 2:
The extended trigger frame acts as an intermediary communication mechanism between the coordinating AP and other APs/STAs. It translates complex coordination decisions into a standardized frame format that can be universally understood, mediating between the complexity of multi-AP coordination algorithms and the simplicity of frame-based communication.
3Productivity
If time allocation information is added to trigger frames, then multi-AP coordinated operations are enabled, but processing time for frame decoding increases
Solution Approach 1:
Time allocation information is provided in advance within the trigger frame before the actual transmission begins. The coordinating AP specifies the allocated time periods and resource units upfront, allowing receiving devices to prepare their transmission schedules and avoid conflicts without requiring real-time processing during the data transmission phase.
Solution Approach 2:
Different portions of the trigger frame contain different levels of detail appropriate to their function: the Multi-AP mode indicator provides high-level coordination information quickly processable by all devices, while the detailed time allocation information is provided only to relevant APs and STAs that need to execute the coordinated operation, optimizing the balance between coordination efficiency and processing overhead.
Data Source
AI summary
This disclosure describes systems, methods, and devices related to multi-AP operations. A device may generate a trigger frame comprising one or more fields to carry information associated with support for signaling for multi-access point (AP) operations. The device may encode the trigger frame with time allocations to one or more devices, wherein the time allocations are based on the information associated with support for signaling for multi-access point (AP) operations. The device may cause to send the trigger frame to the one or more devices.