Access Point Trigger Frame for Variable TTI Allocation

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Solution Overview

Problem

In wireless LAN systems, as the number of station apparatuses communicating simultaneously increases, so does the interference with surrounding apparatuses, reducing communication efficiency in unlicensed bands.

Innovation Solution

An access point apparatus transmits a trigger frame to coordinate frame transmission among station apparatuses, reserving multiple radio resources in time periods with different lengths, thereby improving communication efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the number of station apparatuses communicating simultaneously is increased, then communication throughput is improved, but interference to surrounding apparatuses increases and communication efficiency in unlicensed bands deteriorates

Engineering Contradiction:

Improvecommunication throughputVSAvoidinterference to surrounding apparatuses

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The unlicensed band time resources are segmented into multiple UL TTIs with different lengths. The access point allocates different TTI lengths to different station apparatuses based on their communication needs, allowing simultaneous communications with varying durations. This segmentation enables multiple stations to communicate concurrently while managing interference through differentiated time allocation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different quality attributes are assigned to different time resources allocated to different station apparatuses. Specifically, different TTI lengths are assigned to different stations, creating local variations in resource quality. This allows the system to optimize for each station's specific requirements while maintaining overall system efficiency and controlling interference levels.

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If the access point apparatus manages direct communication between station apparatuses, then radio resources can be utilized more flexibly, but the amount of interference to the surroundings increases

Engineering Contradiction:

Improveradio resource utilization flexibilityVSAvoidinterference power

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

The system dynamically adjusts the length of UL TTIs allocated to different station apparatuses based on real-time communication needs and interference conditions. The access point can modify TTI lengths adaptively, allowing the system to respond to changing traffic patterns and interference levels, thereby maintaining flexible resource utilization while controlling interference power.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The access point apparatus periodically allocates and re-allocates time resources to different station apparatuses in a structured manner. By organizing communications into periodic time slots with different TTI lengths, the system achieves flexible resource management while maintaining controlled interference through regular, predictable transmission patterns.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS20250133590A1Access point apparatus, and communication method

Publication Date: 2025.04.24 SHARP KK

AI summary

An access point apparatus for communicating with multiple station apparatuses includes a transmitter that transmits a trigger frame triggering frame transmission performed by each of the multiple station apparatuses, and a receiver that performs carrier sense to reserve multiple radio resources in time periods with different lengths. The trigger frame includes information indicating the time periods for the multiple radio resources reserved by the receiver.