User Terminal Shortened TTI Control for Latency and Reliability
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Solution Overview
Problem
Existing LTE systems face challenges in controlling communication when using shortened transmission time intervals (TTIs) shorter than 1 ms, as the timing control methods for signal transmission and reception are not well-defined, leading to difficulties in maintaining proper communication.
Innovation Solution
A user terminal is designed to communicate using both normal and shortened TTIs, with a receiving section for downlink control information and a control section that manages simultaneous reception of data based on given conditions, allowing for proper communication even with shortened TTIs by scheduling downlink and uplink data using different control channels within the same carrier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If shortened TTIs are introduced to reduce communication delay, then communication latency is reduced, but timing control becomes undefined and communication reliability deteriorates
Solution Approach 1:
The patent segments the TTI structure into multiple types (first TTI with first DCI, second TTI with second DCI) within the same carrier. This segmentation allows different timing control mechanisms to coexist, enabling shortened TTI operation while maintaining defined timing control through the control section that manages simultaneous reception based on given conditions.
2Adaptability or versatility
If multiple downlink control information are received simultaneously in the same carrier, then communication flexibility increases, but device complexity increases
Solution Approach 1:
The control section dynamically manages the simultaneous reception of first and second downlink control information based on given conditions. The system adapts its reception behavior according to the specific TTI type and scheduling requirements, enabling flexible communication while maintaining manageable device complexity through condition-based control.
Data Source
AI summary
The present invention is designed so that communication can be carried out properly even when shortened TTIs are used. A user terminal communicates using a first transmission time interval (TTI) and a second TTI which has a shorter TTI duration than the first TTI, and this user terminal has a receiving section that receives first downlink control information which is transmitted from a radio base station per first TTI, and second downlink control information which is transmitted in the second TTI, and a control section that controls simultaneous reception of first downlink data which is based on the first downlink control information, and second downlink data which is based on the second downlink control information, in a same carrier, based on a given condition.