Wireless LAN Trigger Frame Aggregation for Dual-Channel RU Mapping

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Solution Overview

Problem

Existing wireless LAN systems lack efficient methods for transmitting and receiving aggregate MPDUs composed of two trigger frames, particularly in indicating resource units of primary and secondary channels through trigger frames.

Innovation Solution

A method and device for transmitting and receiving A-MPDUs that include a first trigger frame indicating resource units within a primary channel bandwidth and a second trigger frame indicating resource units within a secondary channel bandwidth, enabling effective uplink transmission and reception.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a single trigger frame is used to indicate resource units, then the frame structure is simple, but it cannot simultaneously indicate resource units in both primary and secondary channels

Engineering Contradiction:

Improvecapability to indicate resource units in multiple channelsVSAvoidtrigger frame structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The trigger frame is segmented into multiple independent trigger frames within an A-MPDU structure. The first trigger frame indicates resource units in the primary channel, while the second trigger frame indicates resource units in the secondary channel. This segmentation allows each trigger frame to focus on specific channel information, enabling multi-channel indication capability while keeping individual frame structures relatively simple.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Multiple trigger frames are merged into a single A-MPDU (Aggregate Medium Access Control Protocol Data Unit) for transmission. This combining approach allows the system to convey resource unit information for both primary and secondary channels in one transmission opportunity, improving efficiency while maintaining clear separation of channel-specific information through the segmented trigger frames.

Inventive Principle:

Principle #5Merging (Combining)

2Loss of information

If two separate A-MPDUs are transmitted for primary and secondary channels, then channel information is clear, but transmission overhead and latency increase

Engineering Contradiction:

Improvechannel information clarityVSAvoidtransmission latency

Core Design Contradiction:

Loss of informationVSLoss of time

Solution Approach 1:

Two trigger frames that would otherwise require separate A-MPDU transmissions are merged into a single A-MPDU structure. The first trigger frame carries primary channel resource unit information, and the second trigger frame carries secondary channel resource unit information. By transmitting both in one A-MPDU, the system reduces transmission latency and overhead while preserving clear channel-specific information through the segmented trigger frame design.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS20250379712A1Method and device for transmitting and receiving trigger frame in wireless LAN system

Publication Date: 2025.12.11 LG ELECTRONICS INC

AI summary

Disclosed are a method and device operating in a wireless LAN system. The method performed by a first STA in a wireless LAN system according to an embodiment disclosed herein may comprise the steps of: receiving, from a second STA, an aggregated medium access control protocol data unit (A-MPDU) including a first trigger frame and a second trigger frame; and performing uplink transmission on the basis of the first trigger frame and the second trigger frame, wherein the first trigger frame includes first information indicating at least one resource unit (RU) within a primary channel bandwidth, and the second trigger frame includes second information indicating at least one resource unit (RU) within a secondary channel bandwidth.