Reactive Power-Saving Mode Selection for Subscriber Stations
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Solution Overview
Problem
Subscriber stations using WiMAX power-saving classes I and II experience delays in downlink traffic when switching from sleep mode to wake mode due to the iterative increase in sleep interval duration, leading to potential delays in packet delivery, which are greater in PSC I than in PSC II.
Innovation Solution
A subscriber station dynamically selects between PSC I and PSC II based on current packet inter-arrival time and data rate, switching between power-saving modes during a communication session to optimize power conservation and reduce delay, employing a reactive power-saving method that adapts to varying activity levels by selecting PSC II for high-activity periods and PSC I for low-activity periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If PSC I is used with iterative increase in sleep interval duration, then power consumption is reduced, but downlink delay increases
Solution Approach 1:
The patent applies dynamics by making the power-saving mode configurable and adaptable. The system dynamically adjusts between PSC I and PSC II based on traffic conditions, allowing the sleep interval behavior to change from iterative increase (PSC I) to constant duration (PSC II) depending on whether low or high activity is detected, thus optimizing both power consumption and delay performance under different operating conditions
Solution Approach 2:
The patent changes the parameter of sleep interval duration behavior by selecting different power-saving classes. PSC I uses iterative increase in sleep interval duration while PSC II uses constant sleep interval duration. The system monitors traffic activity and switches between these parameter configurations to balance power savings and delay, effectively managing the trade-off between energy loss and time loss
2Loss of energy
If sleep interval duration is increased to save power, then power consumption is reduced, but packet delivery delay increases
Solution Approach 1:
The system dynamically adjusts the sleep interval duration behavior by switching between PSC I (iterative increase) and PSC II (constant duration) based on real-time traffic activity detection. This dynamic adaptation allows the system to optimize power consumption during low activity while maintaining acceptable packet delivery delay during high activity periods
Solution Approach 2:
The patent changes the operational parameter of sleep interval duration by selecting different power-saving classes. PSC I increases sleep interval duration iteratively to maximize power savings during low activity, while PSC II maintains constant sleep interval duration to reduce packet delivery delay during high activity, allowing the system to adapt parameter settings based on traffic conditions
Data Source
AI summary
Disclosed herein is a method and system for power management in a subscriber station. The method involves (a) during a communication session between a subscriber station and an access network, determining a packet inter-arrival time for data received from the access network; (b) determining whether the packet inter-arrival time indicates that the communication session is in a high-activity state or, in the alternative, indicates that the communication session is in a low-activity state; (c) if the packet inter-arrival time indicates that the communication session is in the low-activity state, then selecting a first power-saving mode for use by the subscriber station; and (d) if the packet inter-arrival time indicates that the communication session is in the high.