UCI Redirection for Long and Short TTI Collision in User Terminals
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Solution Overview
Problem
In future radio communication systems, the collision between long and short transmission time intervals (TTIs) in the same carrier can lead to the user terminal stopping transmission of uplink control information (UCI), resulting in potential failure to transmit UCI when a PUSCH of a long TTI and an sPUSCH of a short TTI collide.
Innovation Solution
A user terminal is equipped with a transmission section and a control section that enables the re-direction of at least part of the UCI when a collision occurs between a PUSCH of a long TTI and an sPUSCH of a short TTI, allowing for proper transmission by either intra-carrier re-direction within the same carrier or inter-carrier re-direction to another carrier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the user terminal stops transmitting the long-TTI PUSCH when collision occurs, then the short-TTI sPUSCH can be transmitted without interference, but the UCI carried by the long-TTI PUSCH cannot be transmitted
Solution Approach 1:
The patent introduces a PUCCH as an intermediary channel to carry UCI when collision occurs between long-TTI PUSCH and short-TTI sPUSCH. Instead of directly transmitting UCI on the colliding PUSCH channel, the system uses PUCCH as a mediator to ensure UCI delivery while allowing sPUSCH transmission to proceed without interference.
Solution Approach 2:
The patent dynamically selects the transmission channel for UCI based on collision detection. When collision is detected between long-TTI PUSCH and short-TTI sPUSCH, the system dynamically switches from PUSCH-based UCI transmission to PUCCH-based UCI transmission, ensuring adaptability to changing channel conditions.
2Productivity
If the user terminal transmits both long-TTI PUSCH and short-TTI sPUSCH simultaneously in the same carrier, then resource utilization is maximized, but transmission collisions occur between the two channels
Solution Approach 1:
The patent implements a feedback mechanism where the user terminal detects collisions between long-TTI PUSCH and short-TTI sPUSCH transmissions. Based on this feedback, the terminal automatically adjusts its transmission strategy by redirecting UCI to PUCCH when collision is detected, ensuring both high resource utilization and transmission reliability.
Solution Approach 2:
The patent changes the transmission parameter (channel selection) dynamically based on collision conditions. When collision occurs, the system changes from transmitting UCI on PUSCH to transmitting UCI on PUCCH, while maintaining the ability to transmit both long-TTI and short-TTI data channels simultaneously for optimal resource utilization.
Data Source
AI summary
The present invention is designed so that UCI can be transmitted properly even when a PUSCH of a long TTI and an sPUSCH of a short TTI collide with each other in a same carrier. According to the present invention, a user terminal has a transmission section that transmits UCI, and a control section that controls re-direction of at least part of the UCI, when a PUSCH of a long TTI carrying the UCI, and an sPUSCH of a short TTI, collide with each other in a same carrier.