Cable Modem Group Sleep Control for DOCSIS Energy Management
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Solution Overview
Problem
In the DOCSIS cable service environment, optimizing speed, latency, and energy management across hybrid fiber-coaxial infrastructure is challenging due to variations in signal-to-noise ratios and interference, requiring efficient energy management and profile customization for cable modems.
Innovation Solution
The implementation of a method that segments cable modems into groups based on traffic thresholds, enabling low-power modes and dynamic profile management using orthogonal frequency-division multiplexing (OFDM) with Low Density Parity Check (LDPC) error correction, along with energy management blocks for sleep timers and duty cycles to optimize data flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cable modems operate continuously at full power to maintain network responsiveness, then network reliability is improved, but energy consumption increases
Solution Approach 1:
The patent implements dynamic power management by allowing cable modems to transition between active and low-power states based on traffic conditions. The system dynamically adjusts modem operational states rather than maintaining a fixed power level, resolving the contradiction between continuous operation for reliability and power savings from reduced operation.
Solution Approach 2:
The patent employs periodic wake-up intervals and scheduled traffic transmission patterns where modems alternate between sleep and active states. This periodic operation allows modems to conserve energy during low-traffic periods while maintaining network responsiveness through scheduled wake-ups, directly addressing the reliability-energy tradeoff.
2Productivity
If single-carrier QAM modulation is used in DOCSIS 3.0, then implementation simplicity is maintained, but spectral efficiency and data rates are limited
Solution Approach 1:
The patent transitions from single-carrier QAM to orthogonal frequency-division multiplexing (OFDM), fundamentally changing the modulation parameter space. This parameter change enables higher spectral efficiency and data rates by utilizing multiple orthogonal subcarriers simultaneously, while the systematic approach to OFDM implementation manages the increased complexity.
Solution Approach 2:
The patent segments the single high-rate data stream into multiple parallel lower-rate streams transmitted over orthogonal subcarriers. This segmentation approach in OFDM achieves higher overall productivity by parallel transmission while managing complexity through the structured division of the communication channel into manageable frequency components.
3Use of energy by moving object
If cable modems are segmented into groups with sleep timers, then energy management is improved, but network coordination complexity increases
Solution Approach 1:
The patent creates a universal group management mechanism where the cable modem termination system (CMTS) handles multiple functions including traffic scheduling, sleep timer management, and wake-up coordination for grouped modems. This multi-functional approach improves energy management across the network while centralizing complexity management in the CMTS rather than distributing it across individual modems.
Data Source
AI summary
A method is provided in one example and includes segmenting a plurality of cable modems into a plurality of groups; identifying traffic being received or transmitted by each of the plurality of cable modems that is below a threshold; and determining whether to move each of the plurality of cable modems into a low-power mode based, at least in part, on the traffic being received or transmitted by each of the plurality of cable modems.