MAC-PHY Magic Packet Signaling for Ethernet Energy Efficiency
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Solution Overview
Problem
As the demand for higher data rates in Ethernet networks increases, so does power consumption, posing a challenge for battery life in portable devices and requiring more efficient energy management.
Innovation Solution
A system and method for packet-based signaling between a MAC and a PHY to implement an energy-efficient network communication control policy, which determines and manages power levels by communicating control data through 'magic' packets, allowing devices to enter and exit lower power modes based on traffic demands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If higher data rates are implemented in Ethernet networks, then data transmission performance is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic adjustment of PHY device power modes based on actual network traffic conditions. The system transitions between different power states (active, idle, low-power) rather than maintaining a fixed high-power state, allowing the data rate to be adjusted dynamically to match actual communication needs while reducing power consumption during low-traffic periods
Solution Approach 2:
The system changes operational parameters by implementing different power modes with varying data rates. By adjusting the data rate parameter according to traffic demand, the system can operate at high speeds when needed and reduce to lower power consumption modes when full performance is not required, thus resolving the contradiction between speed and energy use
2Use of energy by moving object
If devices operate in lower power modes to reduce consumption, then energy efficiency is improved, but communication reliability may deteriorate
Solution Approach 1:
The patent employs feedback mechanisms where the system continuously monitors network traffic conditions and adjusts power modes accordingly. This feedback loop ensures that devices transition to lower power modes only when traffic conditions permit, maintaining communication reliability by avoiding power mode changes during high-traffic or critical communication periods
Solution Approach 2:
The system performs preliminary assessment of traffic conditions before transitioning to lower power modes. By evaluating current and predicted traffic patterns in advance, the system can safely enter energy-saving states without compromising communication reliability, as it ensures no critical data transmission is interrupted by the power mode transition
Data Source
AI summary
In an Ethernet network comprising link partners that are coupled via an Ethernet link, an energy efficient network (EEN) communication control policy may be established above a MAC layer. The EEN control policy may determine a power level mode of operation for the link partners. Power level mode control data may be communicated from hardware, software and/or firmware of upper layer protocols to PHY devices. The control data may specify when, where and/or how long to implement the power level mode. The control data may be communicated via a “magic” packet comprising start and/or end of frame delimiters and bits that indicate the power level mode. The PHY devices may detect, parse and/or interpret the “magic” packet and may enter and/or exit a lower power mode of operation. The PHY devices may respond to by generating a magic packet and sending the packet to upper layers.