Uplink MIMO Power Control for User Equipment
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Solution Overview
Problem
Current WCDMA technologies cannot effectively control the transmit power of user equipment (UE) in uplink MIMO scenarios, as they only support single-carrier data transmission and fail to implement power control when the total transmit power exceeds the maximum allowed limit.
Innovation Solution
A method and user equipment with a power reduction unit that reduces the transmit power of both main and secondary data transmission blocks in an uplink MIMO channel, ensuring the total transmit power remains within the maximum allowed limit by adjusting gain factors and performing discontinuous transmission when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uplink MIMO technology is introduced to improve data transmission rate, then transmission capability of the channel is improved, but the system cannot effectively control total transmit power when multiple antennas are used
Solution Approach 1:
The patent segments the power control process into distinct steps: calculating required power for each data transmission block separately, summing the powers, and then applying power reduction only when the total exceeds maximum allowed power. This segmentation makes the complex MIMO power control manageable and systematic.
Solution Approach 2:
The patent performs preliminary power calculation for each data transmission block before actual transmission. By calculating the required power in advance and summing them, the system can determine whether power reduction is needed before transmission occurs, enabling proactive power management.
2Reliability
If power reduction is performed for both main and secondary data transmission blocks in uplink MIMO, then total transmit power is controlled within limits, but power allocation between data streams must maintain equity
Solution Approach 1:
The patent applies power reduction locally to specific data transmission blocks (main or secondary) based on their individual power requirements and the total power constraint. Rather than uniformly reducing all powers, it selectively reduces power where needed while maintaining appropriate power distribution across different data streams.
Solution Approach 2:
The patent dynamically adjusts power parameters (power values for main and secondary blocks) based on channel conditions, data requirements, and total power constraints. By changing power parameters adaptively, the system maintains reliability while ensuring fair power allocation between different data streams.
Data Source
AI summary
Embodiments of the present invention disclose a method for controlling power of an uplink multiple-input multiple-output channel, and a user equipment that are used to support an uplink MIMO application scenario and implement control of transmit power of a UE. The method in the embodiments of the present invention includes: when total transmit power of a user equipment UE is greater than maximum allowed transmit power, performing, by the UE, power reduction for an uplink multiple-input multiple-output MIMO channel on which a main data transmission block and a secondary data transmission block are sent, so that the total transmit power of the UE after the reduction is less than or equal to the maximum allowed transmit power.