Reference Signal Configuration for Uplink Power Control
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Solution Overview
Problem
In radio communication systems, accurately measuring downlink received power and configuring appropriate uplink transmit power is challenging, especially in coordinated communication schemes like CoMP, where interference management is crucial for maintaining system throughput.
Innovation Solution
A communication system that includes configurations for reference signals at the base station to enable the terminal to measure downlink received power and determine appropriate uplink transmit power, using distinct reference signal configurations for channel state reporting, resource element exclusion, and power measurement, allowing for precise power control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple reference signals are configured for different purposes (channel state reporting, data demodulation, power measurement), then measurement precision and power control accuracy are improved, but device complexity increases
Solution Approach 1:
The patent divides the reference signal into multiple distinct types (cell-specific reference signal, UE-specific reference signal, channel state information reference signal) with different functions. Each reference signal is configured separately with specific parameters (first reference signal configuration, second reference signal configuration, third reference signal configuration) to serve different purposes: channel state reporting, data demodulation, and power measurement respectively. This segmentation allows precise measurement of downlink received power without interfering with other signal functions.
Solution Approach 2:
The patent introduces a dedicated third reference signal configuration that acts as an intermediary for power measurement purposes. This configuration specifically identifies resource elements to be excluded from data demodulation targets, creating a separate measurement channel that does not interfere with data transmission or other reference signal functions. The terminal uses this intermediary reference signal to measure downlink received power accurately while the base station maintains separate configurations for other purposes.
2Measurement precision
If resource elements are excluded from data demodulation targets for power measurement, then measurement precision is improved, but data communication efficiency deteriorates
Solution Approach 1:
The patent segments the resource elements into different sets: those used for data demodulation and those excluded for power measurement. The third reference signal configuration specifically identifies which resource elements should be excluded from data demodulation targets, allowing the terminal to measure power on separate resource elements that do not interfere with data transmission. This segmentation enables simultaneous data communication and accurate power measurement without sacrificing throughput.
Solution Approach 2:
The patent applies partial action by excluding only specific resource elements from data demodulation targets rather than excluding all resource elements. The base station configures the terminal with information about which specific resource elements should be excluded, allowing power measurement on a partial set of resource elements while maintaining data communication on other resource elements. This partial exclusion minimizes the impact on data throughput while providing sufficient measurement capability.
3Productivity
If coordinated communication schemes like CoMP are implemented, then system throughput is improved, but interference management complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where the terminal measures downlink received power using the configured reference signals and reports this information back to the base station. The base station uses this feedback to manage interference in coordinated communication schemes. The terminal periodically or aperiodically reports measurement results, enabling the base station to adjust transmission parameters and manage interference between multiple cells or base stations in CoMP operations.
Solution Approach 2:
The patent applies preliminary action by configuring multiple reference signal types and their respective parameters in advance before actual data communication begins. The base station pre-configures the terminal with the first, second, and third reference signal configurations, including information about resource element exclusion and measurement targets. This preliminary configuration enables the terminal to perform accurate power measurements and provide feedback before interference management adjustments are needed during data transmission.
Data Source
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 communication system includes a higher layer processing unit 605 configured to configure, at the base station, for each terminal, a first reference signal configuration for configuring a measurement target for channel state reporting, configured to configure, at the base station, for each terminal, a second reference signal configuration specifying a resource element to be excluded from the target of data demodulation in a case where the terminal demodulates data, and configured to configure, at the base station, for each terminal, a third reference signal configuration for configuring a measurement target for which a reference signal received power is to be measured by the terminal.