Dynamic TDD Configuration Coordination for Interference Mitigation
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Solution Overview
Problem
Current LTE TDD systems face interference issues due to independent and different TDD UL/DL configurations in neighboring cells, leading to increased UL-DL interference, particularly in heterogeneous networks, where dynamic reconfiguration exacerbates inter-cell interference without effective mitigation schemes.
Innovation Solution
Implementing a dynamic TDD UL/DL reconfiguration method where a macro eNB sends authority indicators and traffic load information to pico cells, allowing autonomous or macro-controlled TDD configuration selection based on interference and traffic conditions, minimizing conflicting subframes and thereby reducing UL-DL interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic TDD UL/DL reconfiguration is adopted in small cells, then traffic adaptation capability is improved, but UL-DL interference increases due to conflicting subframes with neighboring cells
Solution Approach 1:
The patent implements a feedback mechanism where the macro eNB receives traffic load information from pico cells and sends back TDD configuration recommendations. This closed-loop feedback enables dynamic traffic adaptation while coordinating with neighboring cells to minimize UL-DL interference through centralized control based on real-time network conditions
Solution Approach 2:
The macro eNB acts as an intermediary that coordinates TDD configurations between multiple pico cells. By receiving traffic load information from all pico cells and sending unified configuration recommendations, the macro eNB mediates the conflict between individual cell traffic adaptation needs and network-wide interference reduction
2Object-affected harmful factors
If all neighboring cells use the same TDD UL/DL configuration, then UL-DL interference is reduced, but traffic adaptation capability is lost
Solution Approach 1:
The patent segments the network into a macro cell layer and pico cell layers with different functional roles. The macro eNB maintains a fixed TDD configuration to minimize interference, while pico cells can dynamically adapt their configurations based on local traffic conditions and macro eNB recommendations, achieving hierarchical segmentation of interference control and traffic adaptation functions
Solution Approach 2:
The patent applies different TDD configuration strategies to different parts of the network: macro cells use fixed configurations for interference reduction, while pico cells use dynamic configurations for local traffic adaptation. This local quality differentiation allows each cell type to optimize for its specific function while maintaining overall network coordination
Data Source
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AI summary
Communication systems, such as the long term evolution (LTE) advanced (LTE-A) of the third generation partnership project (3 GPP) may benefit from various enliancements. These enhancements can include LTE time division duplex (TDD) enhancements for traffic adaptation and uplink (UL) - downlink (DL) interference management. A method can include determining whether a first cell, in a network including the first cell and a second cell, autonomously selects a time division duplex uplink-downlink configuration. The method can also include sending an authority indicator to a base station of the first cell regarding a determination of whether the first cell is to autonomously select the configuration.