User Terminal UL Grant-Free Transmission Parameter Control
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Solution Overview
Problem
In future radio communication systems, such as NR, existing UL grant-free transmission methods lack flexibility, leading to reduced communication throughput and spectral efficiency due to variations in propagation paths and transmission power limitations.
Innovation Solution
A user terminal is equipped with a transmitting section for independent UL data transmission, a receiving section for receiving parameter candidates, and a control section that autonomously determines parameter values for UL data transmission within configured restrictions, allowing adaptive control of UL grant-free transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If UL grant-free transmission is performed with fixed parameter values notified from base station, then UL transmission latency is reduced, but communication throughput and spectral efficiency deteriorate due to inability to adapt to propagation path variations and power limitations
Solution Approach 1:
The patent applies dynamics by enabling the user terminal to dynamically select from multiple candidate parameter values for UL grant-free transmission. Instead of using fixed parameters notified from the base station, the terminal can adaptively choose appropriate parameter values based on current channel conditions and power availability, thereby maintaining both low latency and high throughput by making real-time adjustments without requiring base station intervention for each transmission.
2Device complexity
If UL grant-free transmission is performed with fixed parameter values, then control complexity at base station is reduced, but spectral efficiency deteriorates due to lack of flexible control
Solution Approach 1:
The patent implements self-service by enabling the user terminal to autonomously determine and select appropriate parameter values for UL grant-free transmission from multiple candidates. The terminal independently makes decisions about transmission parameters based on its own measurements of channel conditions and power status, eliminating the need for the base station to provide detailed parameter control while maintaining high spectral efficiency through adaptive parameter selection.
3Speed
If UL grant-free transmission is performed without parameter adaptation, then transmission speed is increased, but reliability deteriorates due to propagation path variations and power limitations
Solution Approach 1:
The patent applies parameter changes by providing multiple candidate values for critical transmission parameters such as modulation and coding scheme (MCS), transmission power, and resource allocation. The user terminal selects from these candidates based on current channel quality and power availability, enabling rapid adaptation to changing conditions while maintaining high transmission speeds and ensuring reliable communication through appropriate parameter adjustment.
Data Source
AI summary
A user terminal according to one aspect of the present disclosure includes: a transmitting section that performs uplink (UL) data transmission, independently of a UL transmission indication from a radio base station; a receiving section that receives information of a plurality of candidates, regarding a value of a parameter used for the UL data transmission; and a control section that determines application of a value determined based on the information of the plurality of candidates to the UL data transmission. According to one aspect of the present disclosure, communication throughput reduction and so on can be prevented even when UL grant-free transmission is performed.