Dynamic DL-UL Reconfiguration in TDD Systems
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Solution Overview
Problem
Current Time Division Duplex (TDD) systems in wireless communication, such as TD-LTE, employ static or semi-static Downlink (DL)-Uplink (UL) configurations that fail to adapt dynamically to instantaneous traffic variations, leading to suboptimal system performance due to neglecting factors like transmission capability.
Innovation Solution
A method and apparatus for dynamically reconfiguring DL-UL resource allocation in TDD systems by considering traffic conditions and both system-wise and UE-wise transmission capabilities, allowing for real-time adjustments based on calculated ratios and transmission capacities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If static or semi-static DL-UL configuration is used, then system complexity is reduced and implementation is simplified, but the system cannot adapt to instantaneous traffic variations leading to suboptimal performance
Solution Approach 1:
The patent implements dynamic DL-UL reconfiguration by enabling the base station to switch between different DL-UL configurations (0-6) based on real-time traffic conditions. The system transitions from static configuration to dynamic configuration where the BS calculates DL-UL ratio from buffer status and selects appropriate configuration every X ms, allowing the system to adapt to instantaneous traffic variations while maintaining manageable complexity through automated decision-making
Solution Approach 2:
The patent employs feedback mechanisms where the base station continuously monitors DL and UL buffer status, calculates the DL-UL ratio, and uses this feedback information to select the most suitable DL-UL configuration. This closed-loop feedback system enables the network to adjust configurations based on actual traffic conditions, improving adaptability while using simple calculation rules to avoid excessive complexity
2Adaptability or versatility
If dynamic reconfiguration every X ms is implemented, then adaptability to traffic conditions improves, but system overhead and processing frequency increase
Solution Approach 1:
The patent implements periodic reconfiguration where the base station performs DL-UL ratio calculation and configuration selection every X milliseconds (where X is an integer larger than 0). This periodic action balances adaptability with processing overhead by configuring the reconfiguration frequency to be high enough to respond to traffic changes but low enough to avoid excessive processing complexity and system overhead
3Productivity
If only data volume ratio is considered for configuration selection, then calculation complexity is reduced, but transmission capability factors are neglected leading to suboptimal performance
Solution Approach 1:
The patent changes the parameter set used for configuration selection from solely data volume ratio to include multiple factors such as transmission capability, channel conditions, and buffer status. The base station calculates a comprehensive evaluation metric that incorporates these additional parameters, allowing for more accurate configuration selection that reflects actual system capabilities while using weighted scoring methods to manage the increased complexity
Data Source
AI summary
Embodiments of the disclosure provide a method and apparatus for reconfiguring DL-UL resource allocation in a TDD system. The method includes steps of: a) obtaining traffic condition about DL and UL data to be transmitted; b) estimating system-wise transmission capability and/or UE-wise transmission capability, wherein the system-wise transmission capability accounts for DL transmission capability and UL transmission capability of the TDD system, and the UE-wise transmission capability accounts for transmission capabilities of different UEs; and c) reconfiguring the DL-UL resource allocation according to the obtained traffic condition and the estimated system-wise transmission capability and/or UE-wise transmission capability.