Adaptive PT-RS Configuration for Inter-Carrier Interference
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Solution Overview
Problem
High density phase tracking reference signals in wireless communications networks lead to reduced spectral efficiency due to inter-carrier interference.
Innovation Solution
Adaptive configuration of phase-tracking reference signals (PT-RS) based on inter-carrier interference (ICI) estimation and reporting, including ICI pre-distortion and PT-RS adaptation, using high density PT-RS for accurate ICI estimation and reducing PT-RS density where necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-density phase tracking reference signals are used to address inter-carrier interference, then ICI mitigation is improved, but spectral efficiency deteriorates
Solution Approach 1:
The patent implements dynamic adaptation of PT-RS density based on reported ICI conditions. The network device adjusts the PT-RS configuration from high-density to appropriate density levels based on feedback from the UE, making the reference signal density variable rather than fixed at high levels, thereby resolving the contradiction between ICI mitigation and spectral efficiency
Solution Approach 2:
The patent changes the parameter of PT-RS density dynamically based on ICI conditions. By adjusting the density parameter from high to appropriate levels based on feedback mechanisms, the system optimizes the balance between maintaining reliable ICI mitigation and preserving spectral efficiency
2Reliability
If high-density PT-RS is configured to compensate for phase noise, then phase noise compensation is improved, but device complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the UE measures ICI conditions and reports them to the network device. Based on this feedback, the network dynamically adjusts the PT-RS configuration, avoiding the need for consistently high-density PT-RS and reducing overall system complexity while maintaining effective phase noise compensation when needed
Solution Approach 2:
The system transitions from static high-density PT-RS configuration to dynamic configuration based on actual ICI conditions. This dynamic approach reduces device complexity by applying high-density PT-RS only when and where phase noise compensation is actually required, rather than universally
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for configurations corresponding to inter-carrier interference. One method includes receiving, at a user equipment (UE), first configuration information for reference signals for performing inter-carrier interference (ICI) estimation including time-frequency resources, a multiplexing pattern, a time-domain behavior, or some combination thereof. The method includes receiving second configuration information for reporting ICI. The second configuration information includes instances of the reference signals for ICI estimation, the time-frequency resources for reporting, the time-domain behavior for reporting, or some combination thereof. The method includes measuring the ICI due to phase noise. The method includes transmitting the ICI report. The method includes receiving third configuration information for performing ICI pre-distortion and phase-tracking reference-signal (PT-RS) adaptation.