Adaptive Idle Mode Duty Cycle Control for Wireless Access Points
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Solution Overview
Problem
Current power-saving techniques for wireless access points (APs) and relay stations (RSs) are inefficient, as they assume APs are always active, leading to increased power consumption during idle periods, which is not suitable for low-cost, low-power deployments in dense networks.
Innovation Solution
Adaptive idle mode duty cycle control for wireless devices, determining neighborhood conditions to adjust preamble transmission periods based on the presence and state of neighboring devices, allowing for efficient power usage and reduced latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If APs operate in idle mode with reduced duty cycle to save power, then power consumption is reduced, but latency increases and mobility support deteriorates
Solution Approach 1:
The patent implements dynamic duty cycle adjustment where the idle mode duty cycle is adaptively varied based on neighborhood conditions such as presence of neighboring devices, traffic load, and mobility requirements. This allows the system to optimize between power savings and latency performance in real-time, rather than using a fixed duty cycle.
Solution Approach 2:
The system uses feedback mechanisms to monitor neighborhood conditions and adjust the idle mode duty cycle accordingly. By continuously assessing environmental factors and performance metrics, the system can dynamically optimize the balance between power consumption and latency, ensuring that power savings do not come at the expense of excessive delay.
2Device complexity
If APs use fixed periodic preamble transmission in idle mode, then device complexity is reduced, but power savings are limited
Solution Approach 1:
The patent transitions from fixed periodic preamble transmission to dynamic duty cycle adjustment based on neighborhood conditions. The system adapts its transmission schedule according to environmental factors such as presence of neighboring devices and traffic patterns, achieving better power savings while maintaining manageable complexity through rule-based adaptation.
3Speed
If APs maintain high duty cycle to support fast call setup and mobility, then service quality is improved, but power consumption increases
Solution Approach 1:
The system dynamically adjusts the idle mode duty cycle based on mobility requirements and call setup speed needs. When high performance is required, the duty cycle increases to support faster response times, while during periods of lower demand, the duty cycle reduces to save power, achieving an optimal balance between service quality and energy consumption.
Solution Approach 2:
The patent changes the duty cycle parameter adaptively based on operational conditions. By varying this key parameter according to neighborhood conditions, traffic patterns, and performance requirements, the system can optimize the trade-off between call setup speed and power consumption without requiring complex architectural changes.
Data Source
AI summary
Apparatus and methods are disclosed for control of an idle mode in a wireless device. In particular, the idle mode duty cycle of a preamble transmission by an access point (AP), as an example, is variably or adaptively set in response to determined conditions of the wireless neighborhood. The conditions determined include the whether or not other wireless devices are present in the vicinity of sensing wireless device, as well as the state of those devices present, such as whether they are in an idle mod or an active mode.