Uplink Power Control for CoMP Channel Measurement Precision
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Solution Overview
Problem
In Distributed Antenna Systems (DAS) for CoMP transmission, the precision of uplink channel measurement is compromised due to the use of a single path loss compensation for both Physical Uplink Shared Channel (PUSCH) and Sounding Reference Signals (SRS), leading to inaccurate channel state information and interference issues.
Innovation Solution
Implementing different uplink power control mechanisms for various uplink signals, where at least one parameter in each power control formula is independently set, allowing for distinct power compensation, including closed-loop power adjustment, target receiving power, and path loss compensation factors, configured by the access point to ensure precise transmission powers for each signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single path loss compensation is used for both PUSCH and SRS, then the device complexity is reduced, but the measurement precision of uplink channel deteriorates
Solution Approach 1:
The patent segments the power control mechanism by introducing separate power control parameters for PUSCH and SRS. Specifically, it uses different path loss compensation factors (α_PUSCH and α_SRS) and different target received power parameters (P_O_PUSCH and P_O_SRS) to independently control the transmission power of each signal type, thereby improving uplink channel measurement precision while maintaining reasonable system complexity
Solution Approach 2:
The patent applies local quality by allowing different power control parameters to be configured for different signal types (PUSCH and SRS) based on their specific requirements. The base station can independently adjust the path loss compensation factor and target received power for SRS to optimize channel measurement quality, while PUSCH power control remains optimized for data transmission
2Measurement precision
If different uplink power control mechanisms are implemented for various uplink signals, then the measurement precision of uplink channel is improved, but the device complexity increases
Solution Approach 1:
The patent implements parameter changes by introducing distinct power control parameters for different uplink signals. It modifies the power control formulas by adding separate path loss compensation factors (α_PUSCH, α_SRS) and target received power parameters (P_O_PUSCH, P_O_SRS), allowing flexible adjustment of transmission powers to improve measurement precision while managing complexity through standardized parameter management
3Ease of operation
If path loss compensation is based on distance between UE and RRH, then the power control is simplified, but the signal quality of SRS received by base station deteriorates
Solution Approach 1:
The patent applies feedback by having the base station measure the actual received power of SRS signals and use this information to adjust the path loss compensation factor α_SRS and target received power P_O_SRS parameters. This closed-loop approach ensures that SRS signals are received with appropriate quality at the base station, compensating for variations in distance and channel conditions
Data Source
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AI summary
Embodiments of the present invention provide an uplink power control method, user equipment and an access point. The method comprises: performing power control on different uplink signals by employing different uplink power control mechanisms respectively to determine the transmission power of each of the different uplink signals; and transmitting the different uplink signals by using the determined transmission power respectively. According to the embodiments of the present invention, the corresponding uplink power control mechanisms may be employed for the different uplink signals to transmit the different uplink signals with appropriate transmission power, thus improving the precision of channel measurement performed by different access points through the corresponding uplink signals.