Terminal Pathloss Calculation Using QCL Parameters
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Solution Overview
Problem
In future radio communication systems, such as NR, it is challenging to determine an appropriate reference signal for quasi-co-location (QCL) and pathloss calculation, which can lead to deteriorated system performance, including decreased throughput.
Innovation Solution
A terminal is designed with a control section that determines a reference signal for pathloss calculation based on QCL parameters corresponding to specific downlink resources when a pathloss reference signal is not configured for uplink transmission, and a transmitting section that performs uplink signal transmission using calculated transmission power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pathloss reference signal is not configured for uplink transmission, then the terminal cannot determine an appropriate reference signal for pathloss calculation, but system performance deteriorates and throughput decreases
Solution Approach 1:
The patent introduces QCL parameters as an intermediary to bridge the gap between downlink reference signals and uplink pathloss calculation. When a dedicated pathloss reference signal is not configured, the terminal uses QCL parameters from downlink resources (such as PDCCH or PDSCH) to determine the appropriate reference signal for pathloss calculation, enabling indirect reference signal selection without direct configuration
Solution Approach 2:
The patent makes downlink reference signals serve multiple functions. The same downlink reference signal that is used for downlink channel estimation and demodulation is also utilized for uplink pathloss calculation through QCL parameter association, eliminating the need for separate dedicated pathloss reference signal configurations
Data Source
AI summary
A terminal according to an aspect of the present disclosure includes: a control section that, when a pathloss reference signal is not configured for specific uplink transmission, determines a reference signal used for calculation of a pathloss based on at least one quasi-collocation (QCL) parameter corresponding to at least one specific downlink resource, and calculates the pathloss; and a transmitting section that performs the specific uplink transmission using transmission power based on the pathloss.