Base Station Power Control via Minimum Code-Channel Threshold
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Solution Overview
Problem
In CDMA wireless communication systems, the Near-Far Effect causes significant power differences between terminals, leading to unstable wireless links and degraded communication quality due to suboptimal power control methods that fail to adequately manage signal power variations.
Innovation Solution
A power control method for base stations that adjusts transmit power based on a permitted minimum code-channel power, calculated by determining the maximum code-channel power and applying a power difference threshold to limit power differences between code-channels, ensuring stable signal transmission and improved communication quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If downlink power control technology is employed to adjust transmit power for each terminal, then power waste is reduced and system capacity is improved, but power difference between signals increases causing Near-Far Effect and link instability
Solution Approach 1:
The patent changes the power parameters by establishing a minimum power difference threshold between code channels. When the power difference exceeds this threshold, the base station adjusts the transmit power to maintain it within the acceptable range, thus resolving the Near-Far Effect while preserving the benefits of power control
Solution Approach 2:
The patent implements a feedback mechanism where the base station continuously monitors the power difference between code channels and adjusts transmit power accordingly. The power control command from the terminal triggers power adjustment, and the minimum power difference constraint provides feedback to maintain link stability
2Reliability
If transmit power is adjusted according to terminal distance and channel conditions, then communication quality for individual terminals is improved, but demodulation performance degrades when power difference is too large
Solution Approach 1:
The patent introduces a minimum power difference parameter (threshold) that constrains the transmit power adjustment. By changing the power parameter to maintain it within a specific range, the patent ensures demodulation performance is not degraded while still improving communication quality through power control
3Reliability
If power control commands are fully executed without considering power difference, then individual terminal signal quality is optimized, but overall system stability deteriorates due to excessive power variation
Solution Approach 1:
The patent changes the system's operational parameter by establishing a minimum power difference threshold. This parameter modification ensures that power control commands are executed within bounds that maintain system stability while still optimizing individual terminal signal quality
Solution Approach 2:
The patent applies beforehand cushioning by pre-establishing the minimum power difference constraint before power control is executed. This preventive measure cushions against excessive power variation that would destabilize the system, allowing power control to proceed safely within defined boundaries
Data Source
AI summary
The present invention discloses a power control method for a base station, including: adjusting, by the base station, a transmit power of a code-channel occupied by a terminal according to a power control command from the terminal; determining a permitted minimum code-channel power according to an adjusted transmit power of the code-channel occupied by the terminal; correcting the transmit power of the code-channel occupied by the terminal according to the minimum code-channel power; and transmitting signals to the terminal according to a corrected transmit power of the code-channel occupied by each terminal. By the present invention, the signal power difference between different users is controlled, the stability of the wireless link is improved, and the quality of system communication is guaranteed.