Radio Communication System Power Control Loop Interruption Handling
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Solution Overview
Problem
In radio communication systems, interruptions in the power control process lead to temporary suboptimal transmit power, resulting in inefficient packet scheduling and resource wastage due to unsuitable transmission formats, especially during handovers or channel measurement interruptions.
Innovation Solution
A mobile station is equipped with power control signal generation and report transmission control means to transmit Channel Quality Information (CQI) reports at non-predetermined times during power control loop interruptions, allowing for improved downlink parameter selection and reduced power consumption by the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If CQI reports are transmitted at a lower rate to reduce signaling overhead, then power consumption and interference are reduced, but the base station receives fewer timely channel quality reports during power control interruptions, leading to suboptimal packet scheduling and transmission format selection
Solution Approach 1:
The mobile station dynamically adjusts its reporting behavior based on system conditions. During power control loop interruptions, the mobile station transmits CQI reports at non-predetermined times to provide timely channel quality information to the base station, ensuring reliable packet scheduling while maintaining energy efficiency through selective reporting rather than continuous high-rate reporting
2Reliability
If the mobile station transmits additional CQI reports during power control interruptions to improve scheduling accuracy, then packet scheduling reliability improves, but signaling overhead and power consumption increase
Solution Approach 1:
The mobile station autonomously detects power control loop interruptions and automatically adjusts its reporting timing to transmit CQI reports at non-predetermined times. This self-service mechanism ensures timely channel quality reporting during interruptions without requiring external control signals, thereby improving scheduling reliability while minimizing additional power consumption through intelligent, condition-based reporting
3Reliability
If the base station waits for the power control loop to converge before resuming normal transmissions, then transmission reliability improves, but system capacity is wasted due to deferred data transmissions
Solution Approach 1:
The mobile station performs preliminary actions by transmitting CQI reports at non-predetermined times during power control interruptions. This allows the base station to receive timely channel quality information before the interruption ends, enabling the base station to make informed scheduling decisions immediately upon resumption without waiting for power control convergence, thus maintaining both reliability and system capacity
Data Source
AI summary
A radio communication system (50) which uses a transmit power control loop to adjust downlink (160) transmit power from a base station (100) to a mobile station (200) and periodic reports of downlink channel quality (CQI) transmitted by the mobile station (200) on an uplink (260) to select a downlink transmission parameter, temporarily transmits additional CQI reports in response to an interruption in the transmit power control loop or the CQI reporting.