Interference Analysis for 5G Random Access with Short Message Support

Abstract:
Sporadic traffic, e.g. in the Internet of Things (IoT), will dramatically increase in the 5G market. Obviously, such traffic should not be crudely integrated into the bulky synchronization procedures of the current 4G LTE cellular systems. A promising approach is to allow for transmission of control signaling and payload “in one shot” in physical layer random access channel. Hereby, a major challenge is to cope with highly asynchronous access as well as high carrier frequency offsets of low-cost IoT devices. We address this challenge by using a waveform design approach based on bi-orthogonal frequency division multiplexing. More specifically, we introduce a novel mathematical approach to analyze such highly asynchronous random access proving superiority of our proposed waveform design. Numerical experiments, using the configuration of the new access method, confirm the analytical results as well as the performance of the waveform.