Intermittent Data Channel Power Control via SIR Segmentation
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Solution Overview
Problem
In wireless communication systems, particularly in CDMA and W-CDMA, controlling the transmit power for multiple data channels is challenging, especially when some channels are intermittently active, as existing power control mechanisms struggle to maintain optimal signal-to-noise-plus-interference ratios (SIR) across both active and dormant channels.
Innovation Solution
The proposed solution involves monitoring each data channel for activity, maintaining separate SIR targets for non-dormant channels, and updating the final SIR target for the physical channel based on the status of received data blocks, with dormant channels' SIR targets being saved and reset to prevent performance degradation when they become active again.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single final SIR target is used for power control of multiple transport channels, then power control is simplified, but performance degradation occurs when channels are intermittently active because dormant channels cannot maintain their SIR targets
Solution Approach 1:
The patent segments the SIR target management by maintaining separate SIR targets for each transport channel instead of using a single final SIR target for all channels. This allows each channel to independently maintain its SIR target even when dormant, resolving the contradiction between simplified power control and reliable SIR target maintenance.
Solution Approach 2:
The patent applies preliminary action by pre-maintaining SIR targets for all transport channels including dormant ones. When a channel becomes active again, its SIR target is already ready, preventing performance degradation. This proactive maintenance of SIR targets resolves the contradiction by ensuring reliability before channels actually need them.
2Reliability
If separate SIR targets are maintained for each transport channel, then SIR target maintenance is improved, but power control complexity increases especially when channels are intermittently active
Solution Approach 1:
The patent introduces dynamics by allowing the set of active transport channels to change over time while maintaining separate SIR targets for each channel. The system dynamically adapts to channel activation and deactivation events, adjusting which channels are monitored and updated without changing the fundamental structure of separate SIR target maintenance. This resolves the contradiction by making the system flexible enough to handle intermittently active channels.
Solution Approach 2:
The patent implements feedback mechanisms where the system continuously monitors the activity status of each transport channel and adjusts power control accordingly. When channels become dormant or active, the system receives feedback and updates its power control strategy, maintaining separate SIR targets only for active channels while preserving targets for dormant channels. This feedback-driven approach resolves the contradiction between reliability and complexity.
3Reliability
If transmit power is continuously allocated to all transport channels, then SIR targets are maintained for all channels, but system capacity is reduced due to wasted power on dormant channels
Solution Approach 1:
The patent extracts dormant channels from the active power control set, removing them from the calculation of the final SIR target while preserving their individual SIR targets. This allows the system to concentrate transmit power on active channels only, improving system capacity while maintaining the ability to quickly restore SIR targets for dormant channels when they become active again.
Solution Approach 2:
The patent applies discarding and recovering by temporarily discarding dormant channels from active power control allocation, then recovering them when they become active again. The SIR targets for discarded channels are preserved and quickly reactivated when needed, ensuring no performance degradation occurs while maximizing system capacity during dormant periods.
4Productivity
If transmit power is reduced for dormant channels, then system capacity is improved, but SIR target maintenance deteriorates when channels become active again
Solution Approach 1:
The patent discards dormant channels from active power control to improve system capacity, while simultaneously recovering their SIR targets by preserving them in memory. When dormant channels become active again, their pre-preserved SIR targets are immediately restored, ensuring no performance degradation occurs despite the reduced power allocation during dormant periods.
Solution Approach 2:
The patent takes preliminary action by pre-preserving SIR targets for channels that may become active in the future. Even though these channels receive no or minimal power while dormant, their SIR targets are maintained in advance, so when they become active again, they can immediately resume optimal performance without degradation.
Data Source
AI summary
Techniques for controlling transmit power for a data transmission sent on multiple data channels, which may be intermittently active, are described. Each data channel is monitored for activity (e.g., based on an error correction code, received signaling information, received block energy, and so on) and deemed to be dormant or not dormant (e.g., based on the amount of elapsed time since activity was last detected on the data channel). A signal quality (SIR) target may be maintained for each non-dormant data channel and updated based on the status of received data blocks for the data channel. A final SIR target, used for power control of the data transmission, may be set to the highest SIR target among the SIR targets for the non-dormant data channels. The final SIR target may also be updated directly based on the status of received data blocks for the non-dormant data channels.