Full Duplex Timing Advance Feedback Mechanism
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Solution Overview
Problem
In wireless communication systems, particularly in 5G New Radio (NR), maintaining timing alignment for full-duplex (FD) communications is challenging due to the simultaneous uplink and downlink transmissions, leading to signal degradation and interference from inter-symbol interference and leakage.
Innovation Solution
A method where a user equipment (UE) receives a timing advance signal from a base station, determines the timing difference between downlink and uplink signals, and transmits a timing report to adjust its timing alignment, allowing for the reception of an updated timing advance signal to compensate for any discrepancies, thereby improving timing alignment and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex communications are used to reduce latency and enhance spectrum efficiency, then productivity is improved, but timing alignment between uplink and downlink signals deteriorates leading to inter-symbol interference and leakage
Solution Approach 1:
The patent implements a feedback mechanism where the UE measures the timing difference between downlink and uplink signals, reports this timing difference to the base station, and receives an updated timing advance signal in response. This closed-loop feedback system enables continuous adjustment of timing alignment while maintaining full-duplex operations, thereby resolving the contradiction between improving spectrum efficiency and maintaining timing alignment reliability.
2Speed
If full-duplex communications are used to reduce latency, then speed is improved, but signal degradation from inter-symbol interference occurs
Solution Approach 1:
The patent applies preliminary anti-action by having the UE proactively measure the timing difference between downlink and uplink signals and report it to the base station before significant interference occurs. The base station then preemptively adjusts the timing advance signal to counteract potential inter-symbol interference, allowing full-duplex operations to proceed at high speed while preventing signal degradation through advance timing correction.
Data Source
AI summary
Aspects relate to reporting timing adjustment for full-duplex (FD) communications. A method by a user equipment (UE) may include receiving a first timing advance signal from a base station, determining, based on the first timing advance signal, a timing difference between a downlink signal and an uplink signal is not within a threshold, transmitting a timing report to the base station, including the determined timing difference, and receiving, from the base station, an updated timing advance signal for full-duplex (FD) communication based on the timing report.