Dynamic Frame Configuration for TDD Wireless Interference Mitigation
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Solution Overview
Problem
Conventional frame switching techniques in TDD synchronized wireless communication systems force all cells to switch communication directions, leading to inefficiencies when some cells have uplink communications during a frame, causing interference and reducing spectral efficiency.
Innovation Solution
Implementing a dynamic frame switching method where cells can independently determine to switch communication direction, transmitting a frame configuration message to neighboring cells, and creating a buffer zone to mitigate interference by delaying communications in nearby cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If all cells are forced to switch communication directions in TDD synchronized systems, then system synchronization is maintained, but spectral efficiency decreases when some cells have uplink communications during a frame
Solution Approach 1:
The patent segments the TDD system into switching cells and non-switching cells, allowing independent frame direction control. Switching cells can dynamically change frame direction based on local traffic needs, while non-switching cells maintain fixed directions, resolving the contradiction between system-wide synchronization and local spectral efficiency optimization.
Solution Approach 2:
The patent introduces dynamic frame switching capability where cells can change communication direction (uplink/downlink) dynamically based on traffic conditions. This dynamic adjustment allows cells to optimize spectral efficiency during uplink-heavy periods while maintaining overall system coordination through buffer zones and gap periods.
2Productivity
If cells dynamically switch communication direction independently, then spectral efficiency improves, but interference is introduced to neighboring cells
Solution Approach 1:
The patent introduces buffer zones as intermediary regions between switching cells and non-switching cells. These buffer zones use extended gap periods to prevent direct interference between cells with different frame directions, acting as a mediator that allows independent switching while protecting neighboring cells from harmful interference.
Solution Approach 2:
The patent applies preliminary anti-action by implementing extended gap periods in buffer zones before switching cells change frame direction. This预先措施 prevents interference from occurring in the first place by creating a protective time interval that stops uplink transmissions from reaching neighboring non-switching cells during direction transitions.
3Object-affected harmful factors
If buffer zones with extended gap periods are created, then interference is mitigated, but communication delay increases for cells in buffer zones
Solution Approach 1:
The patent applies local quality by implementing extended gap periods only in buffer zones rather than system-wide. Cells in buffer zones experience the time delay necessary for interference mitigation, while switching cells and distant non-switching cells maintain normal communication timing, localizing the time loss to only where it is necessary for interference protection.
Data Source
AI summary
Methods, systems, and apparatuses are described for wireless communication at a cell. The cell may transmit, from the cell to a plurality of neighboring cells, a frame configuration message. The frame configuration message may identify the current frame as a switching frame capable of dynamically switching a communication direction. The cell may switch, based at least in part on the frame configuration message, a communication direction between the cell and a user equipment (UE) for at least a portion of the current frame. The cell may communicate with the UE during the current frame according to the switched communication direction.