UE Transmit Power Control via DPCCH2 Gain Quantization
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Solution Overview
Problem
In WCDMA systems, controlling the transmit power of user equipment in soft handover areas is challenging due to calculation errors when reducing the gain factor of the high-speed dedicated physical control channel (HS-DPCCH) using the gain factor of the dedicated physical control channel (DPCCH), which affects the accuracy of transmit power control.
Innovation Solution
A method and apparatus that calculate a first gain factor based on the maximum allowed transmit power and perform quantization processing on this gain factor using the gain factor of the dedicated physical control channel 2 (DPCCH2) to obtain a second gain factor, which is then used to reduce the gain factor of the HS-DPCCH, ensuring the total uplink transmit power does not exceed the maximum allowed power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the user equipment reduces the gain factor of the HS-DPCCH according to the gain factor of the DPCCH in a soft handover area, then the total uplink transmit power is reduced to not exceed the maximum allowed power, but a calculation error occurs and control accuracy of transmit power is reduced
Solution Approach 1:
The patent changes the reference parameter from DPCCH gain factor to DPCCH2 gain factor for calculating HS-DPCCH power reduction. This parameter substitution resolves the calculation error by using the correct reference channel that is actually configured for the user equipment in soft handover areas
Solution Approach 2:
The patent introduces a feedback mechanism where the network side sends indication information to the user equipment about whether DPCCH2 is configured. The user equipment uses this feedback to select the appropriate reference channel (DPCCH or DPCCH2) for gain factor calculation, thereby improving control accuracy
Data Source
AI summary
Embodiments of the present invention provide a method and an apparatus for controlling transmit power of user equipment. The method includes: when total uplink transmit power of user equipment UE exceeds maximum allowed transmit power, calculating a first gain factor according to the maximum allowed transmit power; performing quantization processing on the first gain factor according to a gain factor of a first physical channel, to obtain a second gain factor, where the first physical channel includes a DPCCH2; reducing a gain factor of a second physical channel to the second gain factor, to reduce transmit power of the second physical channel, so that the total uplink transmit power of the UE does not exceed the maximum allowed transmit power, where the second physical channel includes an HS-DPCCH. This reduces a calculation error and improves control accuracy of transmit power.