Reference Signal Configuration for Single Carrier Waveforms
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Solution Overview
Problem
Current wireless communication systems face challenges in configuring reference signals for single carrier waveforms, particularly at high frequencies, where CP-OFDM performance degrades due to phase noise and high peak to average power ratio, limiting cell coverage and increasing UE power consumption.
Innovation Solution
The configuration and signaling of reference signals for single carrier (SC) and SC-FDE waveforms are optimized, restricting resource mapping to time domain only, and using time domain multiplexing patterns for DMRS, CSI-RS, and PRS configurations, ensuring compatibility with SC waveforms and ignoring frequency domain parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CP-OFDM is used for reference signal transmission, then frequency domain resource allocation is efficient, but performance degrades at high frequencies due to phase noise and high PAPR
Solution Approach 1:
The patent changes the fundamental parameter of waveform type from CP-OFDM to single carrier waveform, which fundamentally alters the spectral characteristics and reduces sensitivity to phase noise. This parameter change directly addresses the high frequency performance degradation by selecting a waveform with inherently lower PAPR and phase noise sensitivity.
2Productivity
If frequency domain multiplexing patterns are used for reference signal transmission, then resource utilization is high, but compatibility with single carrier waveforms is reduced
Solution Approach 1:
The patent segments the multiplexing approach by separating frequency domain multiplexing patterns from single carrier waveform requirements. It applies frequency domain multiplexing specifically to OFDM-based reference signals while using time domain multiplexing for single carrier waveforms, allowing each waveform type to use the most appropriate multiplexing method for its characteristics.
Solution Approach 2:
The patent applies different multiplexing qualities to different waveform types: frequency domain multiplexing patterns are applied locally to OFDM reference signals where they are effective, while time domain multiplexing is applied locally to single carrier waveforms where they are more compatible, optimizing performance for each specific waveform type.
3Ease of operation
If unified configuration for multiple waveform types is used, then configuration simplicity is high, but waveform-specific optimization is limited
Solution Approach 1:
The patent creates a universal reference signal configuration framework that can accommodate multiple waveform types (CP-OFDM, SC-OFDM, DFT-s-OFDM) through a common configuration structure. The configuration includes waveform-type-agnostic parameters such as time domain patterns, resource allocation, and multiplexing schemes that work across different waveform types, while allowing waveform-specific optimizations through conditional parameters.
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for configuring a reference signal corresponding to a waveform type. One method includes receiving, at a user equipment from a network device, first configuration information indicating a first physical channel with a first waveform type. The method includes receiving, from a network device, second configuration information indicating a first reference signal with the first waveform type. The method includes determining whether a frequency domain multiplexing pattern with combs, frequency domain orthogonal cover code, or a combination thereof is supported for transmission of the first reference signal with the first waveform type.