Optimizing 5G NR link layer parameters for eMBB and URLLC applications under dynamic channel and transmission...

Area of Science:

• Wireless Communication Engineering
• Telecommunications Systems

Background:

• 5G New Radio (NR) networks require robust link-layer performance for diverse services like ultra-reliable low-latency communication (URLLC) and enhanced mobile broadband (eMBB).
• Realistic channel conditions, including multipath delay spread and Doppler shifts, significantly impact wireless link reliability and throughput.

Purpose of the Study:

• To evaluate the performance of various 5G NR link-layer channels under realistic propagation conditions.
• To investigate the impact of dynamic transmission parameters on link reliability and throughput.

Main Methods:

• Simulated 1000 frames using MATLAB for 5G NR link-layer evaluations adhering to 3GPP standards.
• Employed standardized channel models (CDL-A to CDL-D, TDL-B100) to simulate realistic propagation effects.
• Analyzed performance across different subcarrier spacings (15-120 kHz), modulation schemes (QPSK to 256-QAM), and frequency-hopping strategies for channels like DLSCH, PUSCH, PUCCH, PDSCH, and HARQ.

Main Results:

• Larger subcarrier spacings (60-120 kHz) enhanced throughput in high signal-to-noise ratio (SNR) and low-latency environments.
• Smaller subcarrier spacings (15-30 kHz) yielded better block error rate (BLER) performance in low-SNR and high-delay conditions.
• QPSK demonstrated resilience in noisy conditions, while 256-QAM achieved peak throughput in favorable SNR; PUCCH with frequency hopping showed the lowest BLER, indicating effectiveness in fading channels.

Conclusions:

• Adaptive link-layer configurations are crucial for optimizing spectral efficiency and ensuring reliable performance across various 5G deployment scenarios.
• The findings provide essential insights for designing next-generation wireless networks to meet URLLC and eMBB service demands.