Base Station Subframe Structure for Low Latency 5G Transmission
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Solution Overview
Problem
Current 5G mobile communication systems face challenges in reducing latency due to the limitations of existing TTI shortening technologies, which increase load and power consumption in radio terminals and decrease radio resource utilization efficiency.
Innovation Solution
The implementation of a base station and radio terminal configuration that utilizes a subframe structure with a main PDCCH region and a data region, where a short TTI region is applied, allowing for the arrangement of downlink data in both the main and sub-PDCCH regions, and collective scheduling of sub-PDSCH regions, to enhance data transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If TTI shortening technology is applied to reduce latency, then transmission speed is improved, but radio resource utilization efficiency deteriorates
Solution Approach 1:
The subframe is segmented into multiple regions: main PDCCH region for control information, sub-PDCCH region for short TTI scheduling, and data regions (PDSCH) for user data. This segmentation allows different types of transmissions to coexist efficiently within the same subframe structure, improving overall resource utilization while supporting short TTI operations.
Solution Approach 2:
The patent introduces a new dimensional organization of resources by creating multiple PDCCH regions (main and sub-PDCCH) within the time-frequency grid. This multi-dimensional resource allocation enables simultaneous control signaling for both legacy and short TTI transmissions, resolving the conflict between speed improvement and resource efficiency.
2Speed
If TTI shortening technology is applied to reduce latency, then transmission speed is improved, but load and power consumption in radio terminals increase
Solution Approach 1:
Different regions of the subframe are assigned different qualities and functions: the main PDCCH region handles legacy control signaling, while the sub-PDCCH region specifically handles short TTI scheduling. This local differentiation allows terminals to efficiently process only the relevant control information for their specific service requirements, reducing overall processing load and power consumption.
3Productivity
If downlink data is arranged in both main PDCCH region and sub-PDCCH region, then data transmission efficiency is improved, but device complexity increases
Solution Approach 1:
The system dynamically selects which PDCCH region (main or sub-PDCCH) to use for scheduling based on service requirements and channel conditions. This dynamic approach allows the system to adapt to different transmission scenarios, improving efficiency without requiring permanent complex structures in all devices.
Data Source
AI summary
A base station according to one embodiment comprises a controller configured to perform a downlink transmission process using a subframe. The subframe comprises a main PDCCH (Physical Downlink Control Channel) region located at a head portion of the subframe, and a data region other than the main PDCCH region. The data region comprises a short TTI region to which a short TTI (Transmission Time Interval) having a shorter time length than the subframe is applied. The short TTI region comprises a sub-PDCCH region. The controller is configured to arrange information indicating the sub-PDCCH region in the main PDCCH region.