Uplink Power Control Gain Factor Correction in Compressed Mode
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Solution Overview
Problem
In WCDMA systems, the change in the number of uplink physical channels in compressed mode leads to inaccurate gain factor computation, resulting in inconsistent power control of uplink physical channels.
Innovation Solution
A method and apparatus that compute a relative gain factor in the compressed mode, correct it using a second correction parameter reflecting the relationship between the number of physical channels in compressed and non-compressed modes, and generate a corrected gain factor for accurate power control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of uplink physical channels is increased in compressed mode to bear service data, then the service data capacity is improved, but the power offset increases and power control accuracy deteriorates
Solution Approach 1:
The patent changes the gain factor computation parameters by introducing a correction parameter that accounts for the number of physical channels in compressed mode. This correction parameter adjusts the relative gain factor computation to compensate for the increased number of channels, thereby maintaining power control accuracy despite the increased channel quantity.
2Device complexity
If the gain factor is computed without considering the change in number of physical channels, then the computation complexity is reduced, but the power control accuracy deteriorates
Solution Approach 1:
The patent performs preliminary computation of the correction parameter based on the number of physical channels before computing the final gain factor. This preliminary action allows the system to pre-determine the necessary adjustment factor, which is then applied to the relative gain factor computation, ensuring accuracy without significantly increasing overall computational complexity.
3Ease of operation
If the same gain factor is used for all DPDCHs regardless of number change, then the ease of operation is improved, but the power offset increases
Solution Approach 1:
The patent applies local quality by making the gain factor channel-specific rather than uniform across all DPDCHs. Each physical channel's gain factor is adjusted based on the correction parameter that reflects the actual number of channels, ensuring that power weighting is locally optimized for each channel while maintaining overall system power control.
Data Source
AI summary
A method for controlling power of an uplink physical channel includes: computing a relative gain factor in a compressed mode; correcting the relative gain factor to obtain a corrected relative gain factor; generating a gain factor in the compressed mode according to the corrected relative gain factor; controlling power of the uplink physical channel according to the gain factor in the compressed mode generated. In embodiments of the present invention, after being computed, the relative gain factor in the compressed mode is corrected; the gain factor in the compressed mode is then generated according to the corrected relative gain factor. Thus, an accurate gain factor may be acquired for controlling the power of the uplink physical channel.