User Terminal Retransmission Control Subframe Numerology Configuration
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Solution Overview
Problem
In future radio communication systems, multiplexing multiple user terminals with different numerologies in the same carrier poses challenges in achieving satisfactory latency reduction, particularly when using subframes shorter than 1 ms.
Innovation Solution
A user terminal is equipped with a receiving section for downlink signals and a transmission section that configures retransmission control subframes based on the same numerology among multiple user terminals, controlling the transmission of retransmission control information to effectively reduce latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple user terminals with different numerologies are multiplexed in the same carrier, then service versatility and system capacity are improved, but latency reduction effect deteriorates
Solution Approach 1:
The patent segments the retransmission control process by separating HARQ feedback transmission from the main data transmission. By configuring dedicated retransmission control subframes that are independent from the data subframes, the system can maintain different numerologies for different services while ensuring low latency for latency-sensitive traffic through dedicated feedback channels.
Solution Approach 2:
The patent applies preliminary action by pre-configuring the numerology for retransmission control subframes before the actual communication begins. The control section determines and sets the retransmission control subframe numerology in advance based on the multiplexed numerologies, ensuring that when data transmission occurs, the feedback mechanism is already optimized for low latency requirements.
2Loss of time
If subframes shorter than 1 ms are used, then latency is reduced, but system complexity increases due to multiple numerologies
Solution Approach 1:
The patent implements universality by creating a unified retransmission control mechanism that works across multiple numerologies. The control section universally handles HARQ feedback for all user terminals regardless of their specific numerology, while the transmission section can adapt to different numerologies. This multi-functional approach reduces system complexity compared to having separate mechanisms for each numerology.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the numerology parameters for retransmission control subframes based on the requirements of different user terminals. The control section changes parameters such as subframe timing and numerology selection to optimize latency for specific services while maintaining compatibility with existing LTE numerologies, thus managing system complexity through controlled parameter variation.
3Productivity
If retransmission control information is transmitted using different numerologies, then communication efficiency is improved, but synchronization difficulty increases
Solution Approach 1:
The patent merges the retransmission control function into a unified framework that operates across multiple numerologies. By combining HARQ feedback transmission with the existing LTE control mechanisms and using a common control section that manages all numerologies, the system achieves communication efficiency without proportionally increasing synchronization difficulty.
Solution Approach 2:
The control section acts as an intermediary that mediates between different numerologies. It translates and coordinates the retransmission control requirements across different numerological frameworks, handling the synchronization complexity centrally while allowing individual user terminals to operate with their optimal numerologies for maximum communication efficiency.
Data Source
AI summary
The present invention is designed so that, when a plurality of user terminals with different numerologies are multiplexed in the same carrier, the effect of latency reduction can be achieved effectively. According to the present invention, a user terminal has a receiving section that receives a downlink (DL) signal in a carrier in which a plurality of user terminals with different numerologies are multiplexed, a transmission section that transmits the retransmission control information of the DL signal, and a control section that configures a retransmission control subframe based on the same numerology among the plurality of user terminals, and controls transmission of the retransmission control information in the retransmission control subframes.