Quasi Non-Contention Wireless Access for Low-Jitter QoS

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Solution Overview

Problem

Existing wireless communication systems face challenges in managing medium access efficiently, particularly in scenarios with varying load levels, leading to increased jitter and delay in transmission, especially with Trigger Based (TB) scheduled operations, which are suboptimal in lightly or moderately loaded environments.

Innovation Solution

A quasi non-contention system is introduced, combining scheduled and unscheduled medium access, utilizing a scheduled TB portion for guaranteed QoS and spectral efficiency, followed by an unscheduled EDCA-based portion for delayed or unacknowledged transmissions, allowing for minimal jitter and delay across different load conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If Trigger Based (TB) scheduled operations are used, then QoS guarantee and spectral efficiency are improved, but jitter and delay increase in lightly or moderately loaded environments

Engineering Contradiction:

ImproveQoS guaranteeVSAvoidjitter and delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The system dynamically transitions between scheduled TB operations and unscheduled EDCA operations based on buffer status and load conditions. When buffers are empty or lightly loaded, the system switches to EDCA to reduce jitter and delay. When buffers are full or heavily loaded, the system uses TB scheduled operations to guarantee QoS. This dynamic adaptation resolves the contradiction by adjusting the access mechanism according to real-time network conditions.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes operational parameters by switching between two distinct medium access modes: scheduled TB mode and unscheduled EDCA mode. The transition is triggered by buffer status parameters, allowing the system to optimize performance metrics (jitter and delay) under different load conditions while maintaining QoS guarantees when necessary.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If scheduled TB operations are used, then spectral efficiency is improved, but device complexity increases

Engineering Contradiction:

Improvespectral efficiencyVSAvoidsystem complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The system segments medium access into two distinct phases: a scheduled TB portion for guaranteed QoS and spectral efficiency, followed by an unscheduled EDCA-based portion for delayed or unacknowledged transmissions. This segmentation allows the system to use complex scheduled operations only when necessary, while relying on simpler EDCA operations for other traffic, thereby reducing overall system complexity while maintaining spectral efficiency benefits.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system applies scheduled TB operations partially - only during specific time windows and only when buffer status warrants it. Rather than continuously applying complex scheduled operations, the system uses them selectively, switching to simpler EDCA operations when appropriate. This partial application reduces the burden of implementing and maintaining complex scheduling mechanisms while preserving their benefits when needed.

Inventive Principle:

Principle #16Partial or excessive action

3Adaptability or versatility

If unscheduled EDCA-based access is used, then adaptability to varying load levels is improved, but QoS guarantee deteriorates

Engineering Contradiction:

Improveadaptability to load conditionsVSAvoidQoS guarantee

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The system implements periodic scheduled TB operations interspersed with unscheduled EDCA operations. This periodic structure ensures that QoS guarantees are maintained at regular intervals through scheduled transmissions, while allowing flexible EDCA access in between to adapt to varying load conditions. The periodic alternation between the two modes resolves the contradiction by ensuring QoS is periodically guaranteed while maintaining adaptability during intermediate periods.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentEP4199633B1Systems, methods, and devices for quasi non-contention operation

Publication Date: 2026.02.11 INTEL CORP

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AI summary

This disclosure describes systems, methods, and devices related to quasi non-contention. A device may determine a traffic schedule comprising a non-contention based duration followed by a contention based duration together creating a Quasi Scheduling instance; and determine, during the contention based duration, priorities traffic that would have been transmitted during the non-contention part if it was available for transmission.