Network Device Low Power State Bypassing Node Admission
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Solution Overview
Problem
The duration of the node admission process in power efficient networking, particularly for devices rejoining a network after a low power state, introduces latency and limits the practicality of low power modes, as devices must reconfigure communication parameters, leading to inefficiencies in power management.
Innovation Solution
Implementing a default or basic PHY profile with adjustable values for network devices rejoining the network, allowing them to bypass the node admission process and immediately begin transmitting or receiving data, with parameters such as bits per subcarrier, power level, cyclic prefix size, and forward error correction rate, until the first link maintenance operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a network device enters a low power state and then rejoins the network, then power consumption is reduced, but the device must re-participate in the node admission process which introduces latency
Solution Approach 1:
The patent applies preliminary action by pre-configuring network devices with a basic PHY profile containing default communication parameters before they enter low power states. When devices wake up, they can immediately use these pre-configured parameters to communicate, bypassing the time-consuming node admission process. This resolves the contradiction by preparing the device in advance so that upon waking, no reconfiguration time is needed, thus reducing latency while maintaining power savings.
2Reliability
If a network device re-participates in the node admission process upon rejoining, then communication parameters are properly configured, but the duration of this process limits the practicality of low power modes
Solution Approach 1:
The patent applies parameter changes by transitioning from a full node admission process with detailed parameter negotiation to a simplified rejoining process using a basic PHY profile with default parameters. Devices wake up and immediately use these default parameters for communication. The system dynamically adjusts between two operational modes: full configuration for new devices and quick rejoining with default parameters for waking devices. This resolves the contradiction by changing the parameter configuration approach based on the device state, maintaining reliability for new devices while enabling practical low power modes for returning devices.
3Manufacturing precision
If a device performs ranging and probe transmission to determine transmission parameters, then communication quality is optimized, but this process increases the time before the device is ready to communicate
Solution Approach 1:
The patent applies preliminary action by pre-determining and storing basic transmission parameters in the PHY profile before the device needs to communicate. Instead of performing ranging and probe transmission upon waking from low power state, devices use these pre-configured parameters immediately. This resolves the contradiction by performing the parameter optimization work in advance (during manufacturing or initial setup), so that when devices wake up, they can communicate immediately without time-consuming measurements, thus reducing time to become ready while maintaining adequate communication quality through the pre-optimized parameters.
Data Source
AI summary
A device for power efficient networking may include a processor circuit configured to identify a time to enter a low power state. The processor circuit may be further configured to transmit, prior to the identified time, transmission parameters to a network coordinator device for a network of devices, the transmission parameters being associated with a transmission from at least one of the devices to the device. The processor circuit may be further configured to enter the low power state at the identified time. The processor circuit may be further configured to, upon exiting the low power state, receive the transmission from at least one of the devices based at least in part on the transmission parameters. The processor circuit may be further configured to receive the transmission without participating in a node admission process after exiting the low power state.