Dynamic Listen Interval Adjustment for Ad-Hoc Network Power Management
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Solution Overview
Problem
In ad hoc wireless networks, stations in power-saving mode must wake up at fixed intervals regardless of battery power or traffic, leading to inefficient power management and increased consumption.
Innovation Solution
Introducing Normal Beacon Intervals (NBIs), Beacon-Window-Only Intervals (BBIs), and Sleep Beacon Intervals (SBIs), where stations dynamically adjust their listen intervals based on remaining battery power and quality of service, allowing for flexible data transmission and reduced power usage by broadcasting beacon frames with remaining interval information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stations wake up at every BI to check for ATIM frames, then data transmission reliability is improved, but power consumption increases
Solution Approach 1:
The listen interval is made dynamic rather than fixed. Stations can adjust their listen interval values based on their battery status and traffic conditions, allowing them to skip beacon intervals when appropriate. This dynamic adjustment resolves the contradiction by enabling stations to maintain reliability when needed while reducing power consumption when traffic is light or battery is low.
Solution Approach 2:
The patent changes the parameter of listen interval from a fixed value to a variable that can be adjusted based on station conditions. By modifying this parameter dynamically, the system achieves both reliable data transmission (when interval is short) and reduced power consumption (when interval is extended), resolving the technical contradiction.
2Device complexity
If stations use fixed listen interval, then network synchronization is simplified, but power management flexibility is reduced
Solution Approach 1:
The listen interval parameter is transformed from static to dynamic, allowing stations to adapt their wake-up schedule based on battery status and traffic conditions. This maintains relatively simple synchronization mechanics while greatly enhancing power management flexibility, as stations can independently adjust their intervals without complex coordination.
3Loss of time
If stations wake up frequently to check for data, then data transmission timeliness is improved, but battery life is reduced
Solution Approach 1:
Stations dynamically adjust their listen interval based on real-time conditions including battery status and traffic patterns. When battery is充足 and traffic is urgent, intervals are shortened for timely transmission. When battery is low or traffic is light, intervals are extended to conserve energy, thus resolving the contradiction between timeliness and battery life.
Solution Approach 2:
The listen interval parameter is changed from fixed to variable, allowing the system to optimize the trade-off between data transmission delay and battery consumption. By adjusting this parameter based on current conditions, the system achieves timely transmission when necessary while extending battery life during low-activity periods.
Data Source
AI summary
Power management methods and systems for a first station and a second station in an ad-hoc network. Each station enters the normal beacon interval (NBI) every certain number of beacon intervals (BIs) for data transmission, a Listen Interval (LI). When a station switches to a power-saving mode, it first determines the number of “beacon-window-only beacon intervals (BBIs)” within a LI. In addition, each station broadcasts a beacon frame comprising at least information about “the remaining number of BIs (RBI)” within a beacon window. Once the first station correctly receives the beacon frame from the second station, the first station predicts the NBI of the second station according to the RBI. At the NBI of the second station, the first station transmits data frames to the second station.