DRX Mechanism for Mobile Station Power Reduction
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Solution Overview
Problem
Current radio communication systems in EUTRA technology do not effectively manage power consumption in mobile station devices while maintaining efficient packet data communication, particularly with adaptive modulation/demodulation error correcting methods.
Innovation Solution
The base station and mobile station devices implement a Dynamic Resource Control (DRX) mechanism, where the base station sets intervals for receiving downlink control channels and the mobile station determines reception periods based on RRC messages, adjusting intervals according to radio quality, service type, and communication link status to optimize power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile station device continuously receives downlink control channels to maintain efficient packet data communication, then communication service quality is improved, but power consumption increases
Solution Approach 1:
The patent implements discontinuous reception (DRX) where the mobile station device periodically wakes up to receive downlink control channels during designated reception periods, then enters sleep mode during non-reception periods. This periodic action allows the device to balance between maintaining communication service quality by checking for scheduling information and reducing power consumption by turning off the receiver during idle periods.
2Use of energy by moving object
If the mobile station device reduces reception periods to save power, then power consumption is reduced, but communication service quality deteriorates
Solution Approach 1:
The base station provides feedback through downlink control channels containing scheduling information that indicates whether data is available for the mobile station. The mobile station uses this feedback mechanism to determine when to wake up and when to sleep, ensuring it only activates reception when there is actual communication need, thus maintaining service quality while reducing power consumption.
Solution Approach 2:
The patent makes the reception period configuration dynamic by allowing the base station to adjust the length and frequency of reception periods based on traffic conditions and service requirements. This dynamic adaptation enables the system to optimize the balance between power saving and communication quality according to real-time conditions.
3Use of energy by moving object
If the reception period interval is increased to reduce power consumption, then power efficiency is improved, but scheduling efficiency deteriorates
Solution Approach 1:
The patent segments the downlink control channel reception into discrete, scheduled periods rather than continuous reception. By dividing the reception into specific time slots where the mobile station wakes up to check for scheduling information, the system achieves both power efficiency through reduced active reception time and scheduling efficiency by concentrating control channel processing into manageable intervals.
Data Source
AI summary
With communication service considered, it is an object to provide a communication system in which power consumption of a mobile station device is suppressed. This mobile communication system includes a base station device and a mobile station device, wherein the base station device includes a scheduling portion that carries out scheduling to determine a downlink CQI effective period scheduled by using the downlink CQI as a downlink effective period, start the downlink effective period after a lapse of a given period from downlink CQI transmission timing, and allow the mobile station device to transmit control information and user data only during the downlink effective period.