Wireless Terminal Idle Mode Power Optimization
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Solution Overview
Problem
Conventional wireless communication systems, such as Mobile WiMAX, do not effectively minimize power consumption during the idle mode, particularly in the Paging Unavailable Interval (PUI), leading to inefficient power use and increased energy expenditure due to unnecessary synchronization and frequency reselection procedures.
Innovation Solution
A method and apparatus that dynamically adjust the wake-up interval and frequency selection based on measured signal quality during the Paging Listen Interval (PLI) to optimize power saving, reducing unnecessary synchronization and frequency reselection overhead in the idle mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal performs synchronization and frequency reselection procedures during idle mode, then paging message reception reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic adjustment of wake-up interval based on signal quality measurements. When signal quality is good, the terminal uses a longer wake-up interval to reduce power consumption. When signal quality deteriorates, the wake-up interval is shortened to ensure reliable paging message reception. This dynamic adaptation resolves the contradiction between reliability and power consumption by adjusting system behavior according to actual channel conditions.
Solution Approach 2:
The patent changes the wake-up interval parameter based on measured signal quality. By adjusting this key parameter dynamically, the system optimizes the balance between maintaining reliable paging reception and minimizing power consumption during idle mode operations.
2Reliability
If the terminal shortens the wake-up interval to ensure paging message reception, then paging detection reliability is improved, but power consumption increases
Solution Approach 1:
The patent dynamically adjusts the wake-up interval parameter based on signal quality measurements. When signal quality is good, a longer interval reduces power consumption while maintaining reliability. When signal quality is poor, the interval is shortened to ensure paging detection reliability. This parameter adaptation resolves the contradiction between reliability and power consumption.
Solution Approach 2:
The system implements feedback through signal quality measurement and uses this information to adjust the wake-up interval. The terminal measures downlink channel quality and uses this feedback to determine the appropriate wake-up interval, creating a closed-loop control system that optimizes both reliability and power consumption.
3Reliability
If the terminal performs frequency selection procedure in multi-frequency networks, then paging message reception is improved, but synchronization time and power consumption increase
Solution Approach 1:
The patent performs frequency selection and synchronization procedures in advance during the previous paging listen interval. By completing these procedures before the current PLI begins, the terminal is already synchronized and ready to receive paging messages without additional time delays during the current interval.
Solution Approach 2:
The system dynamically adjusts the wake-up interval to account for the time required to perform frequency selection and synchronization procedures. This dynamic adjustment ensures that the terminal has sufficient time to complete these procedures while minimizing the overall synchronization time across multiple paging cycles.
Data Source
AI summary
A method for minimizing power consumption of a terminal during a power saving mode operation in a wireless communication system includes acquiring synchronization using a frequency used in a first paging listen interval or a frequency selected in a first paging listen interval; measuring a signal quality based on the acquired synchronization; and according to the measured signal quality, determining a length of a wake-up interval for a second paging listen interval. Thus, the terminal operating in the idle mode can minimize the power consumption of the terminal through the efficient control of the synchronization acquisition overhead interval and the frequency reselection algorithm carried out based on and the channel change.