Local Communication Network for Simultaneous Low-Latency Modem Links

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Solution Overview

Problem

Existing DOCSIS networks lack efficient inter-node communication at the edge, leading to high latency and network traffic in mid-haul and backhaul portions due to transmissions through the CMTS, which are load-dependent and contribute to network congestion.

Innovation Solution

Implementing a local communication network (LCN) where local data is transmitted using a shared communication medium and a self-directed simultaneous transmission method, such as the firing squad algorithm, among client nodes without involving the Xhaul transport system, allowing simultaneous transmission of data packets across multiple modems within the LCN.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If data is transmitted through the CMTS using existing DOCSIS infrastructure, then network coverage and compatibility are maintained, but latency increases and network capacity is reduced

Engineering Contradiction:

ImprovelatencyVSAvoidtransmission path complexity

Core Design Contradiction:

Loss of timeVSDevice complexity

Solution Approach 1:

The transmission path is segmented into two independent modes: local data transmission between modems within the same LCN (bypassing CMTS) and remote data transmission through the CMTS. This segmentation allows local communications to avoid the latency-prone mid-haul and backhaul paths while maintaining existing DOCSIS infrastructure for broader connectivity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a Local Communication Network (LCN) as an intermediary layer between client nodes and the core network. The LCN enables direct peer-to-peer communication for local data while the CMTS continues to handle remote data routing, effectively mediating between the need for low-latency local communication and the need for centralized network management.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If multiple client nodes transmit simultaneously to increase throughput, then network capacity increases, but coordination complexity and potential interference increase

Engineering Contradiction:

ImprovethroughputVSAvoidtransmission coordination complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

Each client node in the LCN autonomously determines when to transmit based on local conditions and the firing squad algorithm, without requiring centralized coordination from the CMTS. Nodes self-manage their transmission timing and power levels, enabling simultaneous transmissions to increase throughput while each node independently handles its own transmission control.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent implements periodic power management where client nodes alternate between active transmission periods and low-power sleep periods. This periodic operation enables multiple nodes to transmit simultaneously during active windows while maintaining overall system efficiency and reducing interference during inactive periods.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS20250219868A1Enabling inter-node communication using local communication networks

Publication Date: 2025.07.03 CABLE TELEVISION LAB INC

AI summary

Systems and methods disclosed herein provide an inter-node interface for communication between client nodes, such as modems, in a local communication network (LCN), where local data does not pass through a network hub or mobile core. To improve signal strength, SINR and handoff speeds in the LCN, the disclosed systems and methods also enable a client node within the LCN to self-direct simultaneous transmission of a common data packet by a plurality of client nodes, without employing components of the Xhaul transport system for coordination.