Out-of-band repeater phase noise management
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Solution Overview
Problem
In wireless communication systems, phase noise introduced in higher frequency signals can degrade the quality of signals transmitted between a base station and a user equipment (UE) due to out-of-band repeaters, especially when the repeaters experience phase noise in FR2 signals, which affects UE signals with smaller subcarrier spacing and longer symbol duration, and there is no effective compensation mechanism for the UE.
Innovation Solution
A method where a base station determines the phase noise level and adjusts the repeater configuration or stops using the repeater if the phase noise exceeds a threshold, and the repeater applies phase noise compensation by shifting frequencies between FR1 and FR2 or using an additional reference signal for phase noise estimation and compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If out-of-band repeaters are used to extend coverage in FR2, then coverage area is improved, but phase noise degrades signal quality
Solution Approach 1:
The patent introduces an intermediary phase noise compensation mechanism between the repeater and UE. The base station measures phase noise on the fronthaul link and applies compensation to the repeated signal before transmission to the UE, thereby mitigating the harmful phase noise effect while maintaining coverage extension
Solution Approach 2:
The patent implements a feedback loop where the base station measures phase noise characteristics on the fronthaul link between itself and the repeater, then uses this measured information to adjust and compensate the repeated signal. This closed-loop feedback enables dynamic adaptation to phase noise conditions
2Object-affected harmful factors
If frequency shifting is applied for phase noise compensation, then signal quality is improved, but device complexity increases
Solution Approach 1:
The patent changes the frequency parameter of the repeated signal to compensate for phase noise. By shifting the frequency of the signal from the repeater, the system exploits the relationship between frequency and phase noise characteristics to improve signal quality at the UE
Data Source
AI summary
A first wireless device transmits one or more transmissions for a second wireless device to a repeater for repetition to the second wireless device; adjusts a repeater operation based on a phase noise in transmission between the first wireless device and the repeater; and communicates with at least one of the repeater or the second wireless device based on the adjusted repeater operation. A repeater receives from a first wireless device, a request for the repeater to report a phase noise in transmissions between the first wireless device and the repeater for repetition with a second wireless device; and transmits a report of the phase noise to the first wireless device based on the request. A repeater receives, from a first wireless device, a transmission for repetition with a second wireless device; and transmits the repetition of the transmission to the second wireless device with a phase noise compensation.