Sidelink DC Tone Indication for Interference Avoidance
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Solution Overview
Problem
In 5G New Radio (NR) network configurations, interference from local oscillator (LO) leakage results in distortion on sidelink direct current (DC) tones, affecting wireless communication between devices, as these tones are prone to higher interference and can disrupt phase-tracking reference signals, leading to inaccurate phase noise and frequency offset estimation.
Innovation Solution
Wireless communication devices transmit and receive indications of their sidelink DC tones to avoid utilizing these tones in sidelink signals, reducing interference and improving signal accuracy by scheduling sidelink transmissions on alternative resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sidelink DC tones are used for wireless communication, then communication resources are efficiently utilized, but interference from local oscillator leakage causes distortion and reduces signal accuracy
Solution Approach 1:
The patent extracts and identifies the DC tone locations of each wireless communication device, then excludes these specific tones from sidelink signal transmissions. By taking out the problematic DC tones from the available resource pool and scheduling transmissions only on non-DC tones, the system eliminates interference while maintaining efficient resource utilization on the remaining frequencies.
Solution Approach 2:
The patent applies local quality by treating each device's DC tone as a unique local characteristic that requires individual handling. Each wireless communication device has its own specific DC tone location determined by its RF implementation, and the system schedules transmissions with device-specific awareness, avoiding each device's own DC tone and being aware of other devices' DC tones to prevent interference.
2Reliability
If DC tones are avoided in sidelink signals, then interference is reduced and signal accuracy improves, but available communication resources decrease
Solution Approach 1:
The patent implements feedback mechanisms where wireless communication devices exchange information about their DC tone locations. Each device provides feedback to others about its specific DC tone frequency, enabling the receiving devices to adjust their transmissions accordingly. This feedback loop ensures that all devices can avoid interfering with each other's DC tones while maintaining reliable communication on the remaining resources.
Solution Approach 2:
The patent applies dynamics by making the resource allocation adaptive rather than static. The sidelink resource scheduling dynamically adjusts based on the specific DC tone locations of active devices in the network. As devices are added or removed, or as their RF characteristics change, the available resource pool for sidelink transmissions dynamically reconfigures to exclude only the currently active DC tones, maximizing usable resources while maintaining signal accuracy.
Data Source
AI summary
Aspects relate to direct current (DC) tone indication on the sidelink A wireless communication device (e.g., a UE) may transmit an indication of its sidelink DC tone to one or more other UEs via respective sidelinks. In an example, a transmitting UE may transmit an indication of its sidelink DC tone within second stage sidelink control information included within a data region of a slot. A receiving UE may further transmit an indication of its sidelink DC tone to a transmitting UE over a sidelink between the transmitting UE and receiving UE or a base station in wireless communication with the transmitting and receiving UEs may provide the indication of the sidelink DC tone of the receiving UE to the transmitting UE.