Uplink Power Control for CoMP Terminals via DCI Detection
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Solution Overview
Problem
In radio communication systems, coordinating communication between base stations and terminals using CoMP schemes leads to challenges in determining appropriate uplink transmit power, as it varies based on whether the signal is received by a base station, an RRH, or both, resulting in interference and reduced throughput.
Innovation Solution
A terminal equipped with a receiving unit for radio resource control signals, a higher layer processing unit for calculating path loss, and a transmit power control unit to set appropriate uplink transmit power based on received path loss and power control parameters, enabling accurate power configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the terminal uses a fixed uplink transmit power setting, then the device complexity is reduced, but the system throughput decreases and interference increases due to inability to adapt to different reception scenarios
Solution Approach 1:
The patent implements feedback mechanisms where the terminal measures downlink received power from the base station and RRH, reports this information back to the network, and receives power control commands to adjust uplink transmit power accordingly. This closed-loop feedback enables adaptive power control that optimizes system throughput while managing interference dynamically.
Solution Approach 2:
The patent transitions from fixed power settings to dynamic power adjustment by enabling the terminal to continuously monitor downlink signal conditions and adaptively modify uplink transmit power based on real-time channel state information, thereby optimizing performance across varying reception scenarios.
2Reliability
If the terminal increases uplink transmit power to ensure reception quality, then the reliability of communication is improved, but harmful interference to other base stations increases
Solution Approach 1:
The patent applies local quality by configuring different uplink power control parameters for different uplink signals and different target reception points. The terminal adjusts transmit power specifically for each signal type (e.g., PUCCH, PUSCH, SRS) based on the intended receiver (base station or RRH), thereby ensuring adequate reception quality for each while minimizing unnecessary interference to other base stations.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting power control parameters such as path loss compensation factors and target received power levels based on the specific reception scenario. The network configures different parameter sets for different uplink signals, allowing the terminal to optimize transmit power for each signal type and receiver combination, thus balancing reliability and interference reduction.
3Object-generated harmful factors
If the terminal decreases uplink transmit power to reduce interference, then harmful factors are reduced, but the reception quality at the intended base station or RRH deteriorates
Solution Approach 1:
The patent ensures that each uplink signal is transmitted with locally optimized power levels tailored to its specific receiver and purpose. By configuring separate power control parameters for different signal types and target receivers, the system reduces interference to non-intended base stations while maintaining adequate reception quality at the intended receiver through signal-specific power optimization.
4Adaptability or versatility
If the terminal measures downlink received power from multiple sources, then the adaptability to different communication scenarios is improved, but the difficulty of detecting and measuring increases
Solution Approach 1:
The patent segments the power measurement and control process by separately measuring downlink received power from different sources (base station and RRH) on different frequency resources, and by configuring separate power control parameters for different uplink signal types. This segmentation simplifies the measurement process by organizing it into distinct, manageable components while maintaining high adaptability to different communication scenarios.
Data Source
AI summary
A terminal apparatus for communication with a base station apparatus includes reception circuitry and a transmission circuitry. The reception circuitry receives a higher layer signal and sets first and second parameter sets for an uplink power control. The transmission circuitry transmits an uplink signal. If a cell of a first base station and a cell of a second base station are configured, the transmission circuitry sets a transmit power for the uplink signal based on the first parameter set upon detecting a DCI format from the first base station and sets transmit power based on the second parameter set upon detecting a DCI format from the second base station.