Dynamic Sidelink Waveform Selection for 5G NR
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Solution Overview
Problem
5G NR technologies using high frequency carriers like millimeter-wave (mmW) face challenges such as high signal attenuation and susceptibility to blockage, which are exacerbated by issues like peak-to-average power ratio (PAPR) and spectral efficiency in analog beamforming systems.
Innovation Solution
The method involves determining the capabilities of user equipment (UE) and base stations to dynamically select between channel state information reference signals (CSI-RS) and sounding reference signals (SRS) for sidelink beam training, optimizing waveform selection based on power headroom and number of RF chains to improve communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If analog beamforming techniques are used with wideband power amplifiers to mitigate signal attenuation in mmW systems, then signal coverage and directional communication are improved, but peak-to-average power ratio (PAPR) increases and spectral efficiency deteriorates
Solution Approach 1:
The system dynamically selects between analog and digital beamforming techniques based on communication conditions. The base station determines whether to use analog beamforming with wideband power amplifiers or digital beamforming with DFT-s-OFDM waveforms, allowing adaptive optimization of PAPR performance while maintaining signal coverage reliability
Solution Approach 2:
The invention changes the beamforming parameter (analog vs. digital) and waveform parameter (CP-OFDM vs. DFT-s-OFDM) based on determined capabilities and conditions. This parameter switching enables the system to operate in low-PAPR mode when needed while maintaining the ability to use analog beamforming for coverage enhancement
2Reliability
If analog beamforming techniques are used with wideband power amplifiers to provide directional beams for mmW communication, then directional communication performance is improved, but spectral efficiency deteriorates
Solution Approach 1:
The system dynamically selects between analog and digital beamforming techniques based on communication conditions. The base station determines whether to use analog beamforming with wideband power amplifiers or digital beamforming with DFT-s-OFDM waveforms, allowing adaptive optimization of spectral efficiency while maintaining directional communication capability
Solution Approach 2:
The base station is designed to support both analog and digital beamforming techniques, as well as both CP-OFDM and DFT-s-OFDM waveforms. This multi-functionality allows the system to select the most appropriate combination for each communication scenario, achieving both directional performance and spectral efficiency when needed
3Speed
If high frequency carriers (mmW) are used to enable higher data rate communications, then data rate capability is improved, but signal attenuation increases
Solution Approach 1:
The system dynamically adapts the waveform and beamforming technique based on power headroom and capability determinations. When power conditions allow, it uses configurations optimized for high data rates; when attenuation is severe, it switches to more robust configurations that maintain connectivity while managing power constraints
Data Source
AI summary
Techniques for dynamic sidelink waveform selection are disclosed. In an example, a user equipment (UE) may determine capabilities of the UE and at least one other UE. The UE may also dynamically select a waveform for sidelink beam training based on the capabilities. The UE may also communicate with the at least one other UE based on the selected waveform.