Terminal Uplink Power Control via Path Loss Reference Signals
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In communication systems employing CoMP schemes, accurately setting uplink transmission power is challenging, affecting overall system throughput due to difficulties in channel estimation and resource allocation between base stations and terminal apparatuses.
Innovation Solution
A terminal apparatus and base station apparatus configuration that allows for appropriate uplink transmission power control by using cell-specific and channel state information reference signals to measure path loss and adjust transmission power, enabling coordinated communication between macro base stations and RRHs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If CoMP schemes are employed to improve system throughput, then data communication quality is improved, but uplink transmission power control becomes difficult
Solution Approach 1:
The patent introduces path loss reference signals as an intermediary element that enables the terminal apparatus to measure downlink path loss and determine uplink transmission power. The base station transmits these reference signals, and the terminal uses them to calculate path loss values, which then guide uplink power control decisions. This intermediary mechanism resolves the complexity of power control in CoMP scenarios by providing a clear measurement and control pathway.
Solution Approach 2:
The patent implements feedback mechanisms where the terminal apparatus measures downlink path loss using reference signals, determines appropriate uplink transmission power based on these measurements, and transmits uplink signals accordingly. The base station receives these uplink signals and can adjust future reference signal transmissions based on received signal quality, creating a closed-loop feedback system that optimizes uplink power control in heterogeneous networks.
2Measurement precision
If reference signals are used for path loss measurement, then uplink transmission power can be appropriately controlled, but device complexity increases
Solution Approach 1:
The patent designs reference signals that serve multiple functions: they are used for both downlink channel estimation and path loss measurement. The same reference signal structure is utilized across different scenarios (single-cell and CoMP), reducing the need for separate dedicated measurement signals and thereby limiting the increase in device complexity while maintaining measurement precision.
Solution Approach 2:
The base station pre-configures and transmits path loss reference signals before the terminal apparatus needs to perform uplink transmission. This preliminary action allows the terminal to measure downlink path loss in advance, determine appropriate uplink power levels, and prepare for transmission without requiring complex real-time calculations during the actual uplink transmission moment.
3Area of stationary object
If heterogeneous network configuration is deployed to improve coverage, then area coverage is improved, but interference increases
Solution Approach 1:
The patent applies local quality by configuring different path loss reference signal parameters for different cells and scenarios. Each cell can have customized reference signal configurations (periodicity, resource element positions, etc.) tailored to its specific characteristics. This allows the heterogeneous network to optimize performance locally in each cell while managing interference between cells, rather than applying a uniform configuration across the entire network.
Solution Approach 2:
The patent utilizes parameter changes by allowing dynamic adjustment of uplink transmission power based on measured path loss values. The terminal apparatus adjusts uplink power parameters according to the specific path loss conditions in different cells and scenarios. This parameter adaptation enables the heterogeneous network to maintain appropriate signal levels across different coverage areas while minimizing interference through intelligent power control.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
In a communication system in which a base station apparatus and a terminal apparatus communicate with each other, a base station apparatus, a terminal apparatus, and a communication system with which the base station apparatus and the terminal apparatus can efficiently communicate with each other are provided. The terminal apparatus that communicates with the base station apparatus includes a radio resource control section 6011 that sets a first uplink power control-related parameter configuration and a second uplink power control-related parameter configuration in accordance with information included in a radio resource control (RRC) signal, a reception unit 605 that determines a type of downlink control information (DCI) format, a transmission power control section 6015 that sets uplink transmission power on the basis of the first uplink power control-related parameter configuration or the second uplink power control-related parameter configuration, and a transmission unit 607 that transmits an uplink signal with the set uplink transmission power.