Configurable TDD Subframe Structure for Dynamic Uplink Downlink Ratio
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing the ratio of uplink and downlink information in time division duplex (TDD) subframes, particularly in scenarios where paired carriers with matched bandwidth are not available, leading to suboptimal resource allocation and spectral efficiency.
Innovation Solution
A configurable bi-directional TDD subframe structure is introduced, which includes downlink control, uplink control, uplink data, and downlink data portions, allowing for dynamic adjustment of the uplink-to-downlink information ratio. This structure enables flexible subframe configuration to optimize resource allocation based on current communication needs, with options for collapsing portions and incorporating guard periods to facilitate efficient data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed TDD subframe structure is used, then the system is simple to implement, but the spectral efficiency deteriorates when uplink-downlink traffic ratio varies
Solution Approach 1:
The patent implements dynamic TDD subframe configuration where the uplink-downlink subframe pattern can be adjusted in real-time based on traffic conditions. The eNodeB receives uplink-downlink traffic ratio information from the core network and dynamically configures the TDD subframe structure accordingly, allowing the system to adapt to varying traffic demands and optimize spectral efficiency without requiring complex hardware changes.
Solution Approach 2:
The patent changes the configurable parameters of the TDD subframe structure, specifically the uplink-downlink subframe configuration index and the ratio of uplink information to downlink information. By adjusting these parameters based on traffic conditions, the system can optimize resource allocation and spectral efficiency while maintaining a relatively simple overall structure.
2Productivity
If paired carriers with matched bandwidth are used, then frequency division duplex systems achieve good resource allocation, but paired carriers are not available or not available in matched bandwidth configurations in future deployments
Solution Approach 1:
The patent makes the TDD subframe structure universally adaptable to different carrier configurations and bandwidth scenarios. By implementing dynamic configuration of uplink-downlink subframe patterns and information ratios, the system can efficiently utilize unpaired carriers in TDD mode regardless of bandwidth constraints, achieving resource allocation efficiency comparable to FDD systems with paired carriers while being more versatile for future spectrum allocations.
3Ease of operation
If the ratio of uplink information to downlink information is fixed, then the subframe structure is simple to manage, but resource allocation becomes suboptimal when communication needs vary
Solution Approach 1:
The patent implements dynamic adjustment of the uplink-downlink information ratio within the TDD subframe structure. The eNodeB dynamically configures this ratio based on the uplink-downlink traffic ratio received from the core network, allowing the system to optimize resource allocation for different communication scenarios while maintaining automated management that keeps operational complexity low.
Data Source
AI summary
Aspects of the present disclosure provide a configurable bi-directional time division duplex (TDD) subframe structure. The configurable subframe structure includes a downlink control portion, an uplink control portion, an uplink data portion and a downlink data portion. A current subframe for communication between a scheduling entity and a set of one or more subordinate entities is produced by determining a desired ratio of uplink information to downlink information for the current subframe and configuring the configurable subframe structure with the desired ratio.