Cable Modem Power Savings Mode via Buffer-Based State Switching
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Solution Overview
Problem
Cable networks, particularly DOCSIS networks, face challenges in managing and distributing power efficiently, leading to increased costs and the need for expensive upgrades to handle increased power loads with the introduction of 5G networks, limiting the number of cable modems that can be operated in regions with limited power availability.
Innovation Solution
Implementing a method where cable modems switch to a power savings mode after transmitting data, turning off transmitters and receivers, and remaining in this mode for a determined period based on buffer information from the cable modem termination system and wireless base stations, thereby reducing power consumption without interrupting power supply to connected wireless base stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cable modems operate continuously to maintain network service, then service reliability is improved, but power consumption increases
Solution Approach 1:
The cable modem implements periodic action by alternating between active data transmission modes and power-saving sleep modes. The system enters sleep mode after completing data transmission tasks and wakes up when data becomes available, as controlled by the CMTS. This periodic operation maintains network reliability while significantly reducing continuous power consumption.
Solution Approach 2:
The system employs feedback mechanisms where the CMTS monitors cable modem status and buffer conditions, then sends control messages to regulate power state transitions. This feedback loop ensures the cable modem wakes up only when needed based on actual network conditions, balancing reliability requirements with power savings.
2Productivity
If power plant capacity is increased to handle more cable modems, then network capacity is improved, but infrastructure cost increases
Solution Approach 1:
The system implements dynamic power management where cable modems can transition between active and sleep states based on real-time network conditions. This dynamic behavior allows the network to adjust effective capacity without physical infrastructure changes, as the CMTS controls power delivery to match actual demand.
Solution Approach 2:
The invention changes the operational parameters of cable modems by controlling their power states rather than increasing physical infrastructure capacity. By managing power delivery dynamically based on buffer status and network conditions, the system achieves higher effective capacity from existing infrastructure.
3Speed
If cable modems operate at full power to transmit data immediately, then data transmission speed is improved, but power consumption increases
Solution Approach 1:
The system performs preliminary action by having the CMTS advance power delivery timing based on predicted buffer fill rates and data availability. Rather than waiting for data to accumulate before powering up, the system proactively manages power states to ensure data can be transmitted when needed, reducing idle power consumption while maintaining transmission speed when active.
Data Source
AI summary
The presentation invention relates to methods and apparatus for managing cable network power consumption. An exemplary method in accordance with one embodiment includes the steps of: receiving, by a cable modem positioned between a cable modem termination system (CMTS) and a wireless base station, CMTS buffer information; receiving, by the cable modem, wireless base station buffer information; switching, by the cable modem, from a first mode of operation to a second mode of operation after performing one or both of: (i) transmitting uplink data to the CMTS, and (ii) transmitting downlink data to the wireless base station, the second mode of operation being a power savings modem of operation; remaining in the power savings mode of operation for a first time period, the first time period being based on at least one of said CMTS buffer information or said wireless base station buffer information.