Amplitude Drooping for Full-Duplex Self-Interference
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Solution Overview
Problem
In wireless communication systems, full-duplex operations face self-interference issues due to adjacent uplink and downlink bands, which traditional methods struggle to mitigate effectively, leading to reduced signal quality and increased interference.
Innovation Solution
Implementing amplitude drooping techniques by adjusting RF filtering coefficients based on indications from the base station, allowing the user equipment (UE) to adjust signal power to reduce self-interference when uplink and downlink bands are adjacent, thereby minimizing interference during full-duplex operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional methods are used for full-duplex operations, then system simplicity is maintained, but self-interference between adjacent uplink and downlink bands increases
Solution Approach 1:
The patent applies amplitude drooping as a preliminary action by pre-adjusting the signal power in the uplink band before transmission occurs. This proactive power adjustment prevents self-interference from affecting the downlink reception, rather than attempting to mitigate interference after it occurs. The base station configures the UE to apply amplitude drooping in advance based on bandwidth part configurations, resolving the contradiction by addressing interference prevention before the harmful effect manifests.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the amplitude drooping value based on different bandwidth part configurations. The base station configures multiple amplitude drooping values corresponding to different uplink and downlink bandwidth part combinations, allowing the system to adapt the signal power parameter according to specific operational conditions. This resolves the contradiction by providing flexible parameter adjustment that reduces self-interference while maintaining system manageability.
2Reliability
If amplitude drooping is applied to reduce self-interference, then signal quality in downlink band improves, but uplink transmit power is reduced
Solution Approach 1:
The patent applies local quality by implementing amplitude drooping selectively only in the frequency regions where self-interference occurs, rather than uniformly across the entire uplink band. The technique targets specific adjacent frequency bands that cause interference to the downlink, allowing full uplink power to be maintained in non-interfering frequencies while applying power reduction only where necessary. This resolves the contradiction by preserving downlink reception quality without unnecessarily sacrificing overall uplink transmit power.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The amplitude drooping method effectively reduces self-interference between adjacent bands, enhancing signal quality and reducing interference, thereby improving the overall performance of full-duplex wireless communication systems.
Implementation Method 1
adjusting RF filtering coefficients to apply amplitude drooping, which reduces self-interference by attenuating signal power in frequency regions adjacent to the downlink band
Implementation Method 2
adjusting RF filtering coefficients based on indications from the base station, allowing the user equipment (UE) to adjust signal power
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a base station via the transceiver, an indication to apply an amplitude drooping based at least in part on an uplink band being adjacent to a downlink band in a full-duplex operation. The UE may transmit, to the base station via the transceiver, an uplink transmission in the uplink band based at least in part on the amplitude drooping. Numerous other aspects are described.