Wireless Terminal Measurement Configuration for Interference Control
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Solution Overview
Problem
In radio communication systems, particularly in CoMP schemes, accurately measuring downlink received power and configuring appropriate uplink transmit power is challenging, affecting overall system throughput and interference management.
Innovation Solution
A communication system and method where a base station configures measurement targets for channel-state information and cell-specific reference signals, allowing terminals to report received signal powers from different antenna ports and cells, enabling precise uplink power control and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If CoMP scheme is implemented to improve system throughput, then spectral efficiency increases, but interference measurement accuracy deteriorates
Solution Approach 1:
The patent segments the interference measurement process by introducing separate measurement targets (first and second reference signals) with different properties. The first reference signal is used for measuring downlink received power from the serving cell, while the second reference signal is used for measuring interference from neighboring cells. This segmentation allows accurate interference measurement without affecting the CoMP scheme's ability to improve system throughput.
Solution Approach 2:
The patent introduces reference signals as intermediary elements that facilitate accurate interference measurement. These reference signals act as mediators between the terminal and the network, enabling the terminal to measure both downlink received power and interference levels without directly measuring the complex CoMP downlink signals, thus resolving the measurement accuracy problem while maintaining high system throughput.
2Manufacturing precision
If multiple reference signals are measured to improve power control accuracy, then uplink power configuration improves, but measurement complexity increases
Solution Approach 1:
The patent applies local quality by assigning different measurement functions to different reference signals based on their specific characteristics. The first reference signal is optimized for downlink received power measurement from the serving cell, while the second reference signal is optimized for interference measurement from neighboring cells. This localized specialization enables precise uplink power control without requiring the terminal to perform complex measurements on all signals, thus reducing overall measurement complexity.
3Manufacturing precision
If reference signal measurement is performed to enable power control, then uplink transmit power configuration improves, but signal transmission time increases
Solution Approach 1:
The patent implements preliminary action by having the terminal measure reference signals and report their received powers before actual uplink transmission occurs. The terminal measures the first and second reference signals, determines downlink received power and interference levels, and reports these measurements to the base station in advance. This allows the base station to pre-calculate appropriate uplink transmit power settings, enabling accurate power control without adding significant time delay to the overall communication process.
Data Source
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AI summary
There are provided a base station, a terminal, and a communication system in a wireless communication system in which a base station and a terminal communicate with each other, in which the base station and the terminal can efficiently perform communication. The base station includes a higher layer processing unit 501 configured to configure, for each terminal, a second measurement target configuration configured by the base station, and to configure, for each terminal, a third measurement target configuration for measuring a reference signal generated using a physical ID different from a physical ID of a cell to which the terminal is connected. The terminal includes a transmitting unit 607 configured to report to a base station a received signal of a reference signal as a measurement target specified in the second measurement target configuration and a received signal of a reference signal as a measurement target specified in the third measurement target configuration.