Distributed Resource Unit and Dual CTS for Power-Limited Spectrum

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Distributed Resource Unit (DRU) techniques, while addressing power limitations in wireless networks, lead to spectral inefficiencies and interference, particularly in regulatory power-limited spectrums, causing connection disruptions and inefficient spectrum utilization.

Innovation Solution

Implementing DRU and Dual Clear to Send (CTS) management strategies that allow or disallow DRU techniques based on regulatory power limits, using robust preambles and dual beacons to optimize spectrum usage and reduce interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Length of moving object

If DRU techniques are implemented to address power limitations, then transmission range is improved, but spectral efficiency deteriorates

Engineering Contradiction:

Improvetransmission rangeVSAvoidspectral efficiency

Core Design Contradiction:

Length of moving objectVSProductivity

Solution Approach 1:

The system dynamically switches between DRU and non-DRU modes based on real-time conditions. The AP determines whether to allow DRU techniques by evaluating current spectrum conditions, power limits, and client capabilities, then signals this decision to clients. This dynamic adaptation resolves the contradiction by using DRU only when it provides net benefit for transmission range without unnecessarily sacrificing spectral efficiency.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the operational parameters of resource unit allocation by switching between distributed (DRU) and non-distributed configurations. When power limitations are detected, the system adjusts the tone allocation pattern from contiguous to distributed across the spectrum, thereby extending transmission range while managing the trade-off with spectral efficiency through controlled parameter changes.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If DRU techniques are used in regulatory power-limited spectrums, then connection reliability is improved, but interference increases

Engineering Contradiction:

Improveconnection reliabilityVSAvoidinterference

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The system implements feedback mechanisms where the AP monitors spectrum conditions, interference levels, and connection quality. Based on this feedback, the AP determines whether to allow or disallow DRU techniques and signals this decision to clients. This closed-loop control resolves the contradiction by enabling DRU only when connection reliability benefits outweigh interference costs.

Inventive Principle:

Principle #23Feedback

3Productivity

If DRU techniques are disallowed to reduce spectral inefficiencies, then spectrum utilization is improved, but transmission range deteriorates

Engineering Contradiction:

Improvespectrum utilizationVSAvoidtransmission range

Core Design Contradiction:

ProductivityVSLength of moving object

Solution Approach 1:

The system dynamically adjusts resource allocation strategies based on current needs. When spectrum utilization is the priority (e.g., high data rate requirements, good signal conditions), the system disallows DRU. When transmission range is the priority (e.g., edge clients, poor signal conditions), the system allows DRU. This dynamic switching resolves the contradiction by optimizing for the appropriate metric based on real-time conditions.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20250294612A1Distributed resource unit and dual clear to send implementation

Publication Date: 2025.09.18 CISCO TECHNOLOGY INC

AI summary

Managing the implementation of Distributed Resource Unit (DRU) and Dual Clear to Send (CTS) may be provided. Managing the implementation of DRU and Dual CTS comprises disallowing one or more DRU techniques for a spectrum that has a regulatory power limitation and signaling that the one or more DRU techniques are disallowed. Managing the implementation of DRU and Dual CTS can also comprise enabling one or more allowed DRU techniques.