S-TDMA Trigger Frame Resource Allocation for WLAN Throughput

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Solution Overview

Problem

Next-generation wireless LAN systems face challenges in improving spectrum efficiency and area throughput, especially in dense environments with multiple access points and stations, and outdoor settings, where existing technologies struggle to optimize performance and reduce resource waste.

Innovation Solution

The implementation of a method and device for transmitting PPDU based on the S-TDMA scheme in a wireless LAN system, which involves time-dividing resource units and allocating them to multiple stations, using a trigger frame to coordinate transmissions, and applying channel sensing rules to optimize data transmission opportunities.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If time-division S-TDMA scheme is implemented to allocate resource units to multiple stations, then spectrum efficiency and area throughput are improved, but system complexity and coordination overhead increase

Engineering Contradiction:

Improvearea throughputVSAvoidsystem complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The resource unit is divided into multiple time slots, with each slot allocated to different stations. This segmentation allows multiple stations to share the same frequency resource through time division, improving spectrum efficiency and area throughput while maintaining manageable system complexity through structured resource allocation

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The trigger frame dynamically indicates which time slot each station should use for transmission. This dynamic allocation mechanism allows flexible resource assignment based on current network conditions, optimizing throughput while the standardized trigger frame structure keeps coordination overhead manageable

Inventive Principle:

Principle #15Dynamics

2Productivity

If channel sensing rules are applied to optimize transmission opportunities, then spectrum efficiency is enhanced, but transmission delay and time coordination requirements increase

Engineering Contradiction:

Improvespectrum efficiencyVSAvoidtransmission delay

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

Stations perform channel sensing and determine their transmission opportunities in advance based on the trigger frame indication before actual data transmission. This preliminary action allows stations to prepare their transmissions without waiting for channel contention, reducing transmission delay while improving spectrum efficiency through coordinated access

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The S-TDMA scheme ensures continuous utilization of the channel by allocating specific time slots to different stations, eliminating idle periods and channel contention delays. This continuous useful action maximizes spectrum efficiency while the predetermined slot allocation minimizes transmission delay

Inventive Principle:

Principle #20Continuity of useful action

3Loss of energy

If resource units are time-divided and allocated to multiple stations, then resource waste is reduced and throughput is improved, but coordination overhead and signaling complexity increase

Engineering Contradiction:

Improveresource wasteVSAvoidcoordination overhead

Core Design Contradiction:

Loss of energyVSLoss of information

Solution Approach 1:

Multiple resource unit allocations to different stations are merged into a single trigger frame transmission. This consolidation reduces the overall coordination overhead compared to individual allocations, while the time-division scheme eliminates resource waste by ensuring each station receives exactly the resource units it needs for its specific transmission

Inventive Principle:

Principle #5Merging (Combining)

4Productivity

If S-TDMA scheme is implemented for dense environment optimization, then area throughput is improved, but system complexity and implementation difficulty increase

Engineering Contradiction:

Improvearea throughputVSAvoidimplementation difficulty

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The trigger frame structure is designed to be universal, supporting multiple stations and resource unit types through a standardized format. This multi-functionality allows the same mechanism to handle various allocation scenarios in dense environments, improving area throughput while reducing implementation difficulty through reuse of existing 802.11ax elements

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS11451424B2Method and apparatus for transmitting PPDU on basis of S-TDMA in wireless LAN system

Publication Date: 2022.09.20 LG ELECTRONICS INC

AI summary

A method and an apparatus for transmitting a PPDU on the basis of an S-TDMA in a wireless LAN system are presented. Particularly, an AP transmits a trigger frame to a first STA and a second STA. The AP receives, on the basis of the trigger frame, a first trigger-based frame from the first STA and a second trigger-based frame from the second STA. The trigger frame includes a common information field and a user information field. The common information field includes S-TDMA indication information enabling the S-TDMA to be performed. The user information field includes: allocation information on a first RU to which the first trigger-based frame and the second trigger-based frame are transmitted; first symbol offset information on the first trigger-based frame; and second symbol offset information on the second trigger-based frame.