User Terminal Transmit Power Control for Multiple TRPs
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Solution Overview
Problem
Current radio communication systems, particularly in next-generation mobile communication systems like 5G, face challenges in effectively performing transmit power control for multiple Transmission/Reception Points (TRPs), which hinders spatial diversity gain and communication throughput.
Innovation Solution
A user terminal is equipped with a control section that calculates cumulative Transmit Power Control (TPC) commands per TRP to determine uplink transmission power, enabling appropriate power control even with multiple TRPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate HARQ-ACK feedback is used for multiple TRPs, then HARQ-ACK feedback can be transmitted per TRP, but transmit power control for multiple TRPs is not sufficiently advanced and spatial diversity gain cannot be realized
Solution Approach 1:
The patent segments the transmit power control into per-TRP cumulative TPC commands. Each TRP has its own accumulated TPC command value, allowing independent power control for each TRP's uplink transmission. This segmentation enables the system to manage multiple TRPs separately while maintaining overall coordination, resolving the contradiction between reliable HARQ-ACK feedback and communication throughput.
2Adaptability or versatility
If multiple TRPs are used for downlink transmission, then spatial diversity gain can be achieved, but appropriate transmit power control is not established and communication throughput increase is suppressed
Solution Approach 1:
The patent implements a feedback mechanism where TPC commands are accumulated per TRP based on downlink reception quality. The UE reports accumulated TPC command values for each TRP, enabling the network to adjust uplink transmit power dynamically. This feedback loop allows the system to adapt to changing channel conditions across multiple TRPs, maintaining spatial diversity gain while improving communication throughput.
Data Source
AI summary
A user terminal according to one aspect of the present disclosure includes: a control section that, in a case where a plurality of Transmission/Reception Points (TRPs) are configured, determines transmit power of uplink transmission based on a cumulative value of Transmit Power Control (TPC) commands calculated per TRP; and a transmitting section that performs the uplink transmission by using the transmit power. According to one aspect of the present disclosure, it is possible to perform appropriate transmit power control even in a case where multiple TRPs are used.