LTE TDD Resource Grid Mapping for Inter-Cell Interference Reduction
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Solution Overview
Problem
The deployment of different uplink/downlink sub-frame configurations in adjacent cells in LTE TDD systems leads to inter-cell interference, which existing methods have not effectively addressed.
Innovation Solution
A method and apparatus that map resource grids in adjacent cells to reserve specific resource elements for reference signals and common control channels, preventing information transmission in these elements to reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different uplink/downlink sub-frame configurations are deployed in adjacent cells, then system flexibility and adaptability are improved, but inter-cell interference increases
Solution Approach 1:
The patent applies local quality by configuring different uplink/downlink sub-frame patterns in different cells based on their specific traffic requirements and interference conditions. Each cell can independently select its sub-frame configuration (e.g., Cell A uses configuration 0 while Cell B uses configuration 1), allowing localized optimization while maintaining overall system flexibility. This resolves the contradiction by enabling adaptability at the cell level while managing interference through localized configuration differences.
Solution Approach 2:
The patent implements dynamic sub-frame configuration where the uplink/downlink sub-frame patterns can be adjusted and reconfigured based on changing traffic conditions and interference levels. The system allows dynamic switching between different TDD configurations (0-6) to adapt to varying load conditions, thereby maintaining flexibility while dynamically optimizing interference management. This dynamic approach resolves the contradiction by making the system adaptable to changing conditions while actively managing interference through configuration adjustments.
2Reliability
If resource elements are allocated for reference signals and common control channels in asymmetric sub-frames, then signal quality and control reliability are improved, but available resources for data transmission are reduced
Solution Approach 1:
The patent applies preliminary action by pre-configuring and reserving specific resource elements for reference signals and common control channels before data transmission occurs. In asymmetric TDD sub-frames, certain resource elements are predetermined and protected from data allocation to ensure reliable reference signal transmission and control channel operation. This preliminary reservation ensures that critical signaling functions maintain high reliability regardless of data traffic demands, resolving the contradiction by prioritizing control reliability in advance.
Solution Approach 2:
The patent segments the resource grid into distinct regions: protected resource elements for reference signals and common control channels, and flexible resource elements for data transmission. This segmentation allows the system to guarantee minimum resources for reliable control operations while making efficient use of remaining resources for data. By dividing the resource space into functional segments, the patent resolves the contradiction between ensuring control reliability and maximizing data transmission capacity.
Data Source
AI summary
A method, an apparatus, a base station and user equipment for reducing interference in a wireless communication system are provided. The wireless communication system comprises a first cell and a second cell. The method includes mapping a resource grid of at least one of a first type of sub-frame and a second type of sub-frame to reserve at least one resource element in the first type of sub-frame and corresponding to a resource element in the second type of sub-frame and mapped for at least reference signal and a common control channel, and a resource element in the second type of sub-frame and corresponding to a resource element in the first type of sub-frame and mapped for at least one reference signal and a common control channel, for not transmitting information; and transmitting a mapping result of the mapping.