Base Station Transmission Power Control for W-CDMA Soft Handover
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Solution Overview
Problem
In W-CDMA systems, the transmission power control during soft handover often results in errors due to unequal downstream transmission powers among base stations, especially when transitioning between normal and intermittent transmission modes, leading to suboptimal SIR and potential interference issues.
Innovation Solution
A transmission power control method that adjusts the power balancing ratio based on whether the mobile station is in normal or intermittent transmission mode, using different parameters such as R_gating, r_gating, or f_gating to modify the power adjustment amounts, ensuring the transmission power remains closer to the desired level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If power balancing control is applied to equalize downstream transmission powers among base stations, then interference is reduced and system throughput is improved, but transmission power may deviate from desired levels when transitioning between normal and intermittent transmission modes
Solution Approach 1:
The patent applies dynamics by making the power balancing ratio adjustable based on transmission mode. The base station dynamically changes the power balancing ratio between normal mode and intermittent transmission mode, allowing the system to adapt to different operational states and prevent power deviation while maintaining interference reduction benefits
Solution Approach 2:
The patent implements parameter changes by modifying the power balancing ratio parameter according to transmission mode. In normal mode, a first power balancing ratio is used, while in intermittent transmission mode, a second power balancing ratio is applied. This parameter adjustment ensures accurate transmission power control across different operational conditions
2Ease of operation
If a fixed power balancing ratio is used for all transmission modes, then implementation is simple, but transmission power accuracy deteriorates during mode transitions
Solution Approach 1:
The system transitions from a static fixed ratio approach to a dynamic adjustable ratio approach. The base station determines the current transmission mode and selectively applies different power balancing ratios, maintaining operational simplicity while improving power precision through mode-based adaptation
Solution Approach 2:
The patent applies local quality by using different power balancing ratios for different transmission modes. Instead of a uniform approach, the system tailors the power balancing ratio to the specific operational context, ensuring optimal precision for each mode while keeping the overall control mechanism straightforward
Data Source
AI summary
In a transmission power control method for a base station in a communication system including at least a mobile station and at least one base station, the ratio of transmission power approaching a predetermined reference power is changed between a communication having a slot not transmitting a signal and a communication having no slot not transmitting a signal. Thus, in the transmission power control, it is possible to prevent the downstream transmission power from being too much alienated from a desired transmission power.