Dynamic UL-DL Subframe Switching for 5G Resource Efficiency
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Solution Overview
Problem
In next-generation mobile communication systems, existing TDD-based radio communication systems face inefficiencies due to fixed UL/DL configurations, limiting the flexibility in using radio resources, especially for critical signals like synchronization and random access preambles, which restricts the utilization of radio resources in subframes.
Innovation Solution
A method that allows dynamic scheduling of DL, UL, or SL data channels and reference signals in subframes, enabling flexible use of radio resources by including given DL or UL signals in any OFDM symbol within a time interval, and adjusting the time interval duration and timing independently of their periodicity, thereby optimizing resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the direction of communication of subframes including given DL signals or UL resources is fixed to DL or UL, then these signals can be transmitted/received in a given periodicity, but the communication direction cannot be flexibly changed and the amount of radio resources that can be used is restricted
Solution Approach 1:
The patent applies dynamics by enabling the communication direction of subframes to change dynamically based on traffic conditions. Specifically, subframes that traditionally had fixed DL or UL directions can now be flexibly reconfigured - for example, a subframe configured for DL synchronization signals can dynamically switch to UL direction when traffic conditions require it, allowing the system to adapt communication directions in real-time while maintaining signal transmission reliability through proper resource allocation
Solution Approach 2:
The patent changes the parameter of communication direction from a fixed state to a dynamically adjustable state. By allowing the direction parameter of subframes to be modified based on traffic ratios and system conditions, the patent enables optimization of radio resource utilization while maintaining the periodic transmission of critical signals through careful resource element allocation
2Ease of manufacture
If predetermined UL/DL configurations are used in TDD systems, then signal transmission is simplified, but radio resources cannot be used efficiently when traffic ratios vary over time
Solution Approach 1:
The patent transforms the static UL/DL configuration into a dynamic one that can adapt to varying traffic conditions. Subframes can change their communication direction based on real-time traffic ratios between UL and DL, allowing the system to optimize radio resource efficiency while maintaining operational simplicity through standardized procedures for direction determination
Solution Approach 2:
The patent makes subframes universal by enabling them to serve multiple functions - a subframe can be configured for DL synchronization signals but dynamically switch to UL direction when needed, or vice versa. This multi-functionality allows the same subframe structure to adapt to different traffic conditions, improving overall system efficiency without requiring entirely separate configurations for different scenarios
Data Source
Figure 1A~1C
Figure 2A~2F
Figure 3A~3B
AI summary
The present invention is designed to maximize the amount of radio resources that can be used in DL, UL or SL in a subframe containing a given DL signal or UL resource. A user terminal has a receiving section that receives downlink control information, and a control section that controls communication by switching between UL communication and DL communication within a subframe based on the downlink control information, and, in a subframe including a signal or a resource in a given communication direction, the control section switches communication in a direction different from the communication direction of the signal or the resource.