Reverse Trigger System for Multi-AP Synchronous Transmission

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Solution Overview

Problem

Existing multi-AP trigger solutions require direct communication between access points, limiting their operation to a specific range, whereas the proposed reverse trigger system enables joint and synchronous data transmission between APs that cannot communicate directly by using a common station to relay trigger announcements and frames.

Innovation Solution

The reverse trigger system includes a common station that receives a trigger announcement from an initializer AP and sends a trigger frame to a coordinated AP, allowing the initializer and coordinated APs to send data synchronously, even if they cannot communicate directly, by utilizing a common station that can communicate with both.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If direct communication between APs is required for multi-AP trigger solutions, then communication reliability is improved, but the operational range is limited to a certain distance

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidoperational range

Core Design Contradiction:

ReliabilityVSLength of moving object

Solution Approach 1:

The patent introduces a common station as an intermediary to relay trigger frames between APs that cannot communicate directly. The initializer AP sends trigger announcements to the common station, which then forwards trigger frames to coordinated APs, enabling multi-AP operation beyond direct communication range while maintaining reliable transmission through the mediator.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If APs are placed within direct communication range, then synchronization accuracy is improved, but system adaptability deteriorates

Engineering Contradiction:

Improvesynchronization accuracyVSAvoidsystem adaptability

Core Design Contradiction:

Measurement precisionVSAdaptability or versatility

Solution Approach 1:

The common station acts as a mediator that receives trigger announcements from the initializer AP and generates trigger frames for coordinated APs. This intermediary mechanism allows APs to be placed outside direct communication range while maintaining synchronization through the relayed trigger frames, thus improving system adaptability without sacrificing synchronization accuracy.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The initializer AP sends trigger announcements in advance to the common station, which prepares and forwards trigger frames to coordinated APs before the actual data transmission occurs. This preliminary action ensures that all APs are synchronized and ready for coordinated transmission, maintaining synchronization accuracy even when APs are not within direct communication range.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS11979861B2Reverse trigger system of multiple access point operation including common station, initializer AP and first coordinated AP, and access point

Publication Date: 2024.05.07 SPREADTRUM COMMUNICATION (SHANGHAI) CO LTD

AI summary

A reverse trigger system of multiple access point (multi-AP) operation and an Access Point (AP) are provided. The reverse trigger system includes: a common station; an initializer AP configured to send a trigger announcement to the common station, wherein the common station sends a trigger frame in response to receiving the trigger announcement; and at least one first coordinated AP configured to send first data in response to receiving the trigger frame, wherein the initializer AP is configured to send second data in response to receiving the trigger frame. Embodiments of the present disclosure may enable joint and synchronous data transmission between APs which cannot communicate with each other directly.