Coordinated Frequency Division Multiple Access for Wireless Network Coordination

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Solution Overview

Problem

Existing wireless network coordination methods, such as C-OFDMA, require stringent time synchronization and orthogonality to avoid interference, which can be challenging to maintain, especially in wired networks.

Innovation Solution

Coordinated Frequency Division Multiple Access (C-FDMA) assigns non-orthogonal sub-channels to Access Points (APs) instead of Resource Units or tones, allowing for simpler sub-channel granularity and effective frequency division without the need for sub-microsecond time synchronization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If C-OFDMA is used for wireless network coordination, then interference avoidance is improved through orthogonal frequency allocation, but device complexity and synchronization requirements increase significantly

Engineering Contradiction:

Improveinterference avoidanceVSAvoidsynchronization complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent segments the frequency spectrum into distinct non-overlapping sub-channels for different APs, replacing the need for complex time synchronization with simpler frequency division. Each AP is assigned a specific sub-channel range, eliminating interference without requiring sub-microsecond synchronization precision.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent changes the coordination parameter from time-domain synchronization (C-OFDMA) to frequency-domain allocation (C-FDMA). By allocating different frequency sub-channels to different APs, the system achieves interference avoidance through frequency separation rather than time synchronization, fundamentally changing the coordination mechanism.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If sub-microsecond time synchronization is implemented, then orthogonal frequency allocation is achieved, but ease of operation deteriorates due to stringent synchronization requirements

Engineering Contradiction:

Improveorthogonality maintenanceVSAvoidsynchronization maintenance

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent replaces the time-synchronization mechanism with a frequency-division mechanism. Instead of relying on precise time alignment and orthogonal resource unit allocation, the system uses non-overlapping frequency sub-channel assignments, substituting a mechanically complex synchronization system with a simpler frequency allocation approach.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Productivity

If C-OFDMA is deployed in wired networks, then network coordination is achieved, but adaptability decreases due to difficulty in maintaining time synchronization

Engineering Contradiction:

Improvenetwork coordination capabilityVSAvoidenvironmental adaptability

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The patent adapts the coordination mechanism to different network environments by changing from time-domain to frequency-domain parameters. C-FDMA's frequency-based allocation is inherently more suitable for wired networks where frequency stability can be maintained without stringent time synchronization, thereby improving environmental adaptability while preserving coordination capability.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250142555A1Coordinated frequency division multiple access

Publication Date: 2025.05.01 CISCO TECHNOLOGY INC

AI summary

Coordinated Frequency Division Multiple Access (C-FDMA) may be provided. C-FDMA may include determining sub-channels of a channel for each of a plurality of Access Points (APs). The sub-channels may then be assigned to the plurality of APs. Transmit Opportunities (TxOps) may be scheduled for the plurality of APs on the sub-channels.