Dynamic TDD Subframe Scheduling for 5G Terminals
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Solution Overview
Problem
In next-generation radio communication systems like LTE Rel. 13 and 5G, existing technologies face challenges in dynamically controlling signal transmission and reception in radio frames with mixed subframe configurations, leading to inefficiencies in power management and communication flexibility.
Innovation Solution
A user terminal and radio base station employ a dual subframe structure where the first subframe is dedicated to downlink communication and the second subframe is used for both downlink and uplink transmission, with a receiving section for downlink control channels and a control section to manage signal transmission and reception based on these channels, allowing for dynamic scheduling of signals in each subframe.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If predetermined UL/DL configurations are used in existing LTE systems, then system stability is maintained, but communication flexibility and power saving performance are limited
Solution Approach 1:
The patent implements dynamic TDD by allowing the uplink-downlink configuration to change dynamically across different subframes rather than being fixed. The base station can dynamically indicate to terminals whether to perform reception in downlink subframes or transmission in uplink subframes through downlink control information, enabling the system to adapt to varying traffic conditions while maintaining operational stability through controlled dynamic changes.
2Use of energy by moving object
If dynamic TDD is implemented to improve power saving, then power consumption is reduced, but control complexity increases
Solution Approach 1:
The patent segments the radio frame into different types of subframes (downlink subframes and uplink subframes) with specific configurations. By dividing the frame structure and assigning different functions to different subframe types, the system can dynamically adjust power consumption patterns while managing control complexity through structured segmentation rather than uncontrolled dynamic changes.
Solution Approach 2:
The patent employs periodic patterns in the dynamic TDD configuration, where downlink subframes and uplink subframes are arranged in periodic sequences. This periodic structure allows terminals to anticipate configuration patterns and manage power consumption predictably, reducing control complexity compared to completely aperiodic dynamic changes.
3Adaptability or versatility
If mixed subframe configurations are used for scalability, then future adaptability is improved, but signal transmission control difficulty increases
Solution Approach 1:
The patent introduces downlink control information as an intermediary mechanism between the base station and terminals. This control information carries indications about whether terminals should perform reception in downlink subframes or transmission in uplink subframes, serving as a mediator that simplifies the control of mixed subframe configurations and reduces the difficulty of managing signal transmission in scalable future systems.
Data Source
AI summary
A terminal is disclosed that includes a receiver that receives higher layer signaling that indicates a periodic time period in which uplink transmission is not performed and a processor that monitors downlink control information for scheduling system information in the time period. In other aspects, a radio communication method and a base station are disclosed.