User Terminal-Specific Reference Signal for Dynamic Power Control
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Solution Overview
Problem
In existing LTE systems, the assumption of constant downlink data channel transmission power leads to deteriorated received quality for user terminals due to varying propagation loss and interference, which is expected to worsen in future radio communication systems with denser base stations and increased interference.
Innovation Solution
Implementing user terminal-specific reference signals and transmission power control commands to dynamically adjust the transmission power of downlink data channels and reference signals based on measured received quality, allowing each user terminal to achieve optimal communication conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If downlink data channel is transmitted with constant transmission power, then device complexity is reduced and ease of operation is improved, but downlink received quality deteriorates due to varying propagation loss and interference
Solution Approach 1:
The patent applies dynamics by transitioning from constant transmission power to dynamic transmission power control. The base station adjusts the transmission power of downlink data channels based on TPC commands received from user terminals, allowing the system to adapt to varying propagation loss and interference conditions while maintaining ease of operation through automated control mechanisms.
Solution Approach 2:
The patent implements feedback through TPC (Transmit Power Control) commands that user terminals send to the base station based on their received quality measurements. This feedback loop enables the base station to adjust transmission power dynamically, resolving the contradiction between constant power simplicity and variable quality requirements.
2Productivity
If radio base stations are provided more densely to achieve higher communication capacity, then productivity is improved, but interference from nearby cells increases and downlink received quality deteriorates
Solution Approach 1:
The patent applies local quality by enabling each user terminal to receive individually adjusted transmission power levels tailored to their specific location and interference conditions. This allows dense base station deployment for high capacity while maintaining received quality through localized power adjustments based on TPC commands from each terminal.
3Reliability
If transmission power of downlink data channel is dynamically adjusted based on user terminal conditions, then downlink received quality is improved, but device complexity increases
Solution Approach 1:
The patent applies self-service by enabling user terminals to autonomously measure their received quality and generate appropriate TPC commands without complex external coordination. Each terminal independently determines the necessary power adjustment and communicates it to the base station, improving received quality while limiting complexity growth through decentralized decision-making.
Data Source
AI summary
The present invention is designed to improve DL received quality in future radio communication systems. According to the present invention, a user terminal has a receiving section that receives a downlink (DL) data channel, which is demodulated using a user terminal-specific reference signal, a transmission section that transmits a transmission power control (TPC) command, which is used to control transmission power of the DL data channel and/or the reference signal; and a control section that controls transmission of the TPC command.