Terminal SRS Power Correction for CoMP Interference
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Solution Overview
Problem
In communication systems using CoMP methods, maintaining orthogonality between terminals becomes challenging as the number of terminals increases, leading to increased interference of sounding reference signals (SRS) within a single cell ID.
Innovation Solution
A terminal is equipped with mechanisms to perform first and second power corrections on the transmit power of SRS based on respective transmission power control (TPC) commands, detected from uplink grants and downlink assignments, to randomize signal interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of terminals increases in CoMP communication, then communication capacity is improved, but orthogonality between terminals deteriorates and SRS interference increases
Solution Approach 1:
The patent applies dynamics by making the SRS transmission power adjustable and controllable through TPC commands. The base station can dynamically change the power level of SRS signals from different terminals, allowing the system to adapt to varying interference conditions while maintaining high communication capacity. This dynamic power control enables the system to resolve the contradiction between supporting multiple terminals and maintaining signal orthogonality.
Solution Approach 2:
The patent changes the power parameter of SRS signals to manage interference. By adjusting the transmission power of SRS through TPC commands, the system can control the level of interference between terminals while maintaining communication capacity. This parameter change approach allows flexible management of the trade-off between productivity and harmful interference factors.
2Measurement precision
If multiple TPC commands are used for SRS power control, then power correction accuracy is improved, but control signal complexity increases
Solution Approach 1:
The patent merges multiple TPC commands into a unified power control mechanism. Instead of treating multiple TPC commands as separate complex controls, the system integrates them to jointly determine the SRS transmission power. This merging approach maintains power correction accuracy while reducing the perceived complexity by presenting a unified control structure to the terminal.
Solution Approach 2:
The TPC commands serve multiple functions: they provide power correction for SRS transmission and can be integrated with other uplink power control mechanisms. This multi-functionality allows the same control signals to achieve both precise power correction and coordination with overall uplink power management, reducing the need for separate specialized control signals.
Data Source
AI summary
Provided are a terminal, a communication method, and an integrated circuit, enabling a base station and a terminal to efficiently communicate with each other in a communication system in which the base station and the terminal communicate with each other. A terminal performs communication with at least one base station, and includes means for performing first power correction on the transmit power of a sounding reference signal (SRS) on the basis of a first transmission power control (TPC) command, and means for performing second power correction on the transmit power of the SRS on the basis of a second TPC command.