Dynamic Target SIR Adjustment for Mobile Power Control
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Solution Overview
Problem
In mobile communication systems, sudden changes in the reception channel environment lead to excessive transmission power control requests, as existing methods fail to flexibly adjust the target Signal-to-Interference Ratio (SIR) and step sizes, causing interference between adjacent Mobile Stations.
Innovation Solution
An apparatus and method that dynamically adjust the target SIR and its step sizes by decreasing the target SIR with a larger step size at the initial stage of a sudden increase and gradually reducing the step size to prevent excessive power control requests, thereby preventing excessive transmission power adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the receiver apparatus uses a fixed target SIR and fixed SIR step size for power control, then the power control mechanism is simple and stable, but it causes excessive transmission power control requests during sudden channel environment changes
Solution Approach 1:
The patent implements dynamic adjustment of the target SIR and SIR step size based on channel conditions. The receiver apparatus changes the target SIR dynamically when transport block errors occur, and adjusts the SIR step size adaptively (using larger steps when errors occur frequently, smaller steps when errors are rare), transforming the fixed power control mechanism into a dynamic one that responds to channel variations.
Solution Approach 2:
The patent changes the parameters of the power control system (target SIR and SIR step size) based on observed channel conditions and error rates. When transport block error rate exceeds a threshold, the target SIR is increased and the step size is adjusted upward; when error rate is low, the target SIR is decreased and step size is reduced, optimizing performance for different channel states.
2Reliability
If the receiver apparatus rapidly adjusts the target SIR to satisfy BLER during sudden channel changes, then the QoS requirement is met, but it causes excessive transmission power requests and interference with adjacent Mobile Stations
Solution Approach 1:
The patent implements dynamic adjustment of the target SIR and SIR step size based on channel conditions. The receiver apparatus changes the target SIR dynamically when transport block errors occur, and adjusts the SIR step size adaptively (using larger steps when errors occur frequently, smaller steps when errors are rare), transforming the fixed power control mechanism into a dynamic one that responds to channel variations.
Solution Approach 2:
The patent uses feedback from transport block error detection to adjust power control parameters. The receiver monitors the occurrence of transport block errors and uses this feedback to modify the target SIR and step size, creating a closed-loop system that balances QoS requirements with interference mitigation.
3Speed
If the receiver apparatus uses a large SIR step size to quickly respond to channel changes, then the response speed is improved, but it causes excessive power adjustments and instability
Solution Approach 1:
The patent implements dynamic adjustment of the target SIR and SIR step size based on channel conditions. The receiver apparatus changes the target SIR dynamically when transport block errors occur, and adjusts the SIR step size adaptively (using larger steps when errors occur frequently, smaller steps when errors are rare), transforming the fixed power control mechanism into a dynamic one that responds to channel variations.
Solution Approach 2:
The patent changes the parameters of the power control system (target SIR and SIR step size) based on observed channel conditions and error rates. When transport block error rate exceeds a threshold, the target SIR is increased and the step size is adjusted upward; when error rate is low, the target SIR is decreased and step size is reduced, optimizing performance for different channel states.
Data Source
AI summary
An apparatus and method for flexibly changing a fixed target SIR, a fixed target SIR step size, and a time to perform a TX power control request, in order to prevent a receiver apparatus from performing an excessive TX power control request upon a sudden RX channel environment change in a mobile communication system. The apparatus includes a target Signal-to-Interference Ratio (SIR) determiner for flexibly changing a fixed target SIR upon a sudden target SIR re-decrease, after a previous increase, by decreasing a target SIR by a large step size at an initial stage of a sudden target SIR increase and decreasing the target SIR down-step size with an approach to a normal target SIR.