Adaptive numerology — A solution to address the demanding QoS in 5G-V2X

Abstract

The critical requirements for the future automated connected cars to communicate are crucial to satisfy. It is challenging to achieve high reliability and low latency in Vehicle-to-Everything (V2X) communication under variant velocity and varying channel conditions. We propose an adaptive system design to enhance robustness against Doppler and multipath effects, and to accomplish the Quality of Service (QoS) requirements of a V2X system. The key idea is to adapt the transmission configuration to fulfill the stringent reliability constraints considering the effect of mobility and channel conditions. We suggest adapting the transmission parameters such as subcarrier spacing and symbol duration including Cyclic Prefix overhead, termed as numerology. An adaptive numerology selection algorithm is proposed in this work, which shows significant gains. The adaptation is dependent on the estimated channel parameters such as Signal-to-Noise Ratio (SNR), delay spread and Doppler spread. A comparative Bit-Error-Rate (BER) performance evaluation is performed by simulations, highlighting the benefits of numerology adaptation.