User Terminal Multi-TTI Cell Control
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Solution Overview
Problem
Future radio communication systems, such as those in 5G, require efficient communication methods that can handle multiple cells with different transmission time intervals (TTIs) to manage high-frequency bands and small data communications, but existing LTE systems with a 1 ms TTI may not provide sufficient services.
Innovation Solution
A user terminal and radio base station system that allows communication using a plurality of cells with different TTIs, including a control section for managing communication between cells with normal and short TTIs, enabling efficient information broadcast and reception from multiple cells with varying TTI lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If communication using multiple cells with different TTIs is implemented, then communication efficiency and speed are improved, but system complexity and control difficulty increase
Solution Approach 1:
The system segments cells into different TTI groups (first cell with normal TTI, second cell with short TTI) to enable differentiated communication patterns. This segmentation allows each cell to operate independently with its own TTI configuration, improving overall communication efficiency while managing complexity through structured organization.
Solution Approach 2:
The control section dynamically adapts to handle multiple TTIs by implementing flexible scheduling and control mechanisms that can switch between different TTI lengths based on cell requirements. This dynamic approach enables the system to optimize performance for each cell type while maintaining manageable control complexity through adaptive resource allocation.
2Loss of time
If short TTI is used for faster communication, then processing delay is reduced, but control and synchronization become more difficult
Solution Approach 1:
The system applies different TTI qualities to different cells based on their specific requirements. The second cell uses short TTI locally to reduce processing delay for time-critical communications, while the first cell maintains normal TTI for less time-sensitive traffic. This local differentiation optimizes performance without requiring the entire system to manage the complexity of short TTI.
Solution Approach 2:
The control section acts as an intermediary that manages the complexity of short TTI control. It implements coordination mechanisms and synchronization protocols that mediate between the short TTI cell and the network, making the control difficulty manageable through structured intermediate processing and control functions.
Data Source
AI summary
To perform communication using a plurality of cells using different transmission time intervals (TTIs) in an appropriate manner, a user terminal includes a control section for controlling the communication using the plurality of cells including at least a first cell and a second cell using a shorter TTI than a TTI of the first cell, and a reception section for receiving information broadcasted from each of the first and second cells. The user terminal receives system information and/or paging information as the information broadcasted from each cell.