Full-Duplex Downlink Timing Alignment Under Interference Conditions
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing transmission timing in full-duplex systems, particularly in 5G/NR networks, where simultaneous transmission and reception can lead to interference and alignment issues, especially with the introduction of higher frequency bands and advanced antenna technologies.
Innovation Solution
The implementation of a method and apparatus for determining downlink reference timing and conditions for reception, using receive timing adjustment values and conditions to manage transmission timing in full-duplex systems, including user equipment and base stations, to align and optimize signal reception and transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If simultaneous transmission and reception are implemented in full-duplex systems, then spectral efficiency and system capacity are improved, but interference and signal alignment issues occur
Solution Approach 1:
The system performs preliminary timing alignment by determining DL reference timing and evaluating conditions before actual reception. The UE prepares receive timing adjustment values and validates conditions in advance, ensuring proper synchronization is established prior to full-duplex operation, which prevents interference from misaligned signals.
Solution Approach 2:
The patent implements dynamic timing adjustment mechanisms where the UE can adaptively adjust receive timing based on evaluated conditions. The system transitions between different reception modes (using receive timing adjustment value vs. using DL reference timing) based on condition validity, allowing flexible optimization of timing alignment under varying channel and interference conditions.
2Measurement precision
If receive timing adjustment values are applied to align signal reception, then signal alignment is improved, but timing synchronization complexity increases
Solution Approach 1:
The timing synchronization process is segmented into distinct evaluation stages. The system separates the timing adjustment mechanism into conditional evaluation (determining whether conditions are valid) and execution (applying either receive timing adjustment value or DL reference timing). This segmentation simplifies the overall complexity by breaking down the synchronization process into manageable, condition-based steps.
Solution Approach 2:
The condition evaluation acts as an intermediary between the timing adjustment value and the actual reception process. By introducing this intermediate validation step, the system selectively applies timing adjustments only when conditions warrant, thereby maintaining signal alignment precision while reducing unnecessary processing complexity in stable conditions.
3Stability of the object's composition
If DL reference timing is used for reception, then timing consistency is improved, but adaptability to changing channel conditions deteriorates
Solution Approach 1:
The system dynamically switches between two timing reference modes based on condition evaluation. When conditions are valid, the UE uses receive timing adjustment values for adaptive optimization; when conditions are not valid, the UE falls back to DL reference timing for stability. This dynamic adaptation allows the system to maintain timing consistency while responding to changing channel conditions.
Solution Approach 2:
The patent changes the timing reference parameter based on condition validity. The system transitions between using receive timing adjustment values (when conditions are valid) and using DL reference timing (when conditions are not valid). This parameter change strategy enables the system to optimize between adaptability and consistency depending on the current channel and interference conditions.
Data Source
AI summary
Apparatuses and methods for transmission timing in full-duplex systems. A method for receiving a downlink (DL) signal or channel associated with a reception timing procedure includes receiving first information for a receive timing adjustment value and second information for a condition. The method further includes determining a DL reference timing and whether the condition is valid for reception in a slot. The method further includes receiving the DL signal or channel in the slot based on the receive timing adjustment value and the DL reference timing when the condition is valid and the DL reference timing when the condition is not valid.