Sidelink DC Location Exchange for Interference Mitigation
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Solution Overview
Problem
In 5G NR wireless communication systems, the direct current (DC) location indication between user equipments (UEs) can cause interference and noise, leading to performance degradation, as the DC location is often UE-dependent and not explicitly indicated, making it difficult for receiving UEs to filter out the DC tone effectively.
Innovation Solution
The method involves UEs exchanging DC location indications over sidelink channels, allowing receiving UEs to decode and filter out the DC tone based on the indicated location, which is determined by the UE's implementation, and transmitting this information via physical sidelink shared and control channels to enable proper compensation and puncturing of the DC tone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If DC location indication is not explicitly transmitted between UEs, then signaling overhead is reduced, but DC-related interference and noise cause performance degradation
Solution Approach 1:
The patent extracts the DC location information from the implicit UE-dependent determination and makes it an explicit transmitted parameter. The transmitting UE determines its DC location based on UE implementation and explicitly indicates this location to the receiving UE through sidelink channels, allowing the receiver to apply targeted DC rejection filtering only at the indicated DC tone location rather than using broad-spectrum filtering.
Solution Approach 2:
The patent implements a feedback mechanism where the transmitting UE provides DC location information to the receiving UE, enabling the receiver to adjust its DC rejection filtering based on the actual DC tone location. This feedback loop allows the system to adapt to UE-specific DC characteristics and maintain optimal performance.
2Object-affected harmful factors
If DC rejection filtering is applied broadly, then DC interference is mitigated, but signal quality and throughput are reduced due to loss of useful signal components
Solution Approach 1:
The patent applies DC rejection filtering locally at the specific DC tone location rather than using broad-spectrum filtering. By obtaining the DC location indication from the transmitting UE, the receiving UE can apply filtering only at the precise frequency location where DC interference occurs, preserving signal components at other frequencies and maintaining higher signal quality and throughput.
3Adaptability or versatility
If DC location is determined by UE implementation without explicit indication, then device autonomy is maintained, but interference mitigation effectiveness is reduced
Solution Approach 1:
The patent segments the DC interference mitigation function into two parts: the transmitting UE determines its DC location based on its own UE implementation (maintaining autonomy), and this determined location is then communicated to the receiving UE for targeted filtering. This segmentation allows each UE to maintain its implementation autonomy while achieving effective interference mitigation through coordination.
Data Source
AI summary
The apparatus may be a UE. The UE may be configured to receive, from a second UE, an indication of a first DC location corresponding to a first subcarrier of multiple subcarriers. The UE may further be configured to decode at least one transmission from the second UE based on the received indication of the first DC location corresponding to the first subcarrier. The UE may also be configured to receive a request for a second DC location and to transmit, to the second UE, an indication of a second DC location corresponding to a second subcarrier of the multiple subcarriers. The UE may, in some aspects, further be configured to receive, from a base station, signaling relating to a transmission of a DC location between sidelink UEs.