AP-to-AP Trigger Mechanism for Multi-AP WLAN Coordination
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Solution Overview
Problem
Current wireless local area network (WLAN) systems face challenges in supporting multiple access point (MAP) operation, specifically in AP-to-AP triggering and responding, which is essential for efficient multi-AP coordination and low-latency real-time traffic management.
Innovation Solution
A method and apparatus for transmitting and receiving triggers and trigger-based frames between access points (APs) in a WLAN system, including the transmission of physical layer protocol data units (PPDUs) that contain information related to multi-AP operation, enabling AP-to-AP triggering and response mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional single-AP operation is used in WLAN systems, then device complexity is reduced, but the system cannot support multi-AP coordination and real-time traffic management
Solution Approach 1:
The patent segments the trigger frame into multiple parts: a first trigger frame sent from one AP to another AP, and a second trigger frame sent from the triggered AP to stations. This segmentation allows complex multi-AP coordination to be broken down into manageable communication steps, reducing the complexity burden on individual components while enabling versatile multi-AP operation.
Solution Approach 2:
The patent introduces an intermediary trigger frame mechanism that mediates communication between APs and stations. The first trigger frame acts as an intermediary signal that initiates the coordination process, allowing APs to communicate intent without direct complex interaction, thus reducing device complexity while enabling multi-AP versatility.
2Reliability
If AP-to-AP trigger and response mechanism is implemented, then coordination between multiple APs is improved, but transmission latency increases
Solution Approach 1:
The patent implements preliminary action by having APs exchange trigger frames in advance to establish coordination before actual data transmission. The first trigger frame is sent beforehand to initiate the multi-AP coordination process, allowing the system to prepare coordination parameters and reduce latency during actual real-time traffic management, thus improving reliability without excessive time loss.
Solution Approach 2:
The trigger frame mechanism operates periodically to maintain multi-AP coordination. By establishing regular trigger and response cycles, the system ensures consistent coordination reliability while optimizing transmission timing to minimize latency accumulation, balancing reliability requirements with time efficiency.
3Productivity
If multi-AP operation is supported, then real-time traffic management is enhanced, but the system complexity and difficulty of implementation increase
Solution Approach 1:
The trigger frame is segmented into distinct functional parts: the first trigger frame for AP-to-AP communication and the second trigger frame for AP-to-station communication. This segmentation allows each part to be processed independently with focused functionality, reducing the overall implementation complexity while maintaining high productivity for real-time traffic management through coordinated multi-AP operation.
Solution Approach 2:
The trigger frame mechanism is designed with universality to handle multiple functions: coordinating between APs, triggering station transmissions, and managing real-time traffic. By creating a multi-functional trigger framework, the patent reduces the need for separate specialized mechanisms, thereby lowering implementation complexity while enhancing real-time traffic management productivity across diverse scenarios.
Data Source
AI summary
Disclosed are a method and a device for access point-to-access point trigger and response for a multi-access point operation in a wireless LAN system. A method for performing a response to an AP-to-AP trigger by a first access point (AP) in a wireless LAN system according to an embodiment of the present disclosure comprises the steps of: receiving a first trigger frame from a second AP; and transmitting a first physical layer protocol data unit (PPDU) to the second AP or at least one station (STA) on the basis of the first trigger frame, wherein the first trigger frame is transmitted from the second AP to at least one AP including the first AP, the first PPDU transmitted to the second AP comprises information related to a multi-AP operation, and the first PPDU transmitted to the at least one STA may comprise a second trigger frame.