Evaluation of Coverage and Mobility for URLLC via Outdoor Experimental Trials

摘要

The fifth generation mobile communications (5G) system will need to support ultra-reliable and low-latency communications (URLLC) to enable future mission-critical applications, e.g., self-driving cars and remote control. In this paper, we clarify coverage and mobility performance of URLLC by field experimental trials. To achieve URLLC requirements in 5G, we use a new frame structure, which adopts wider subcarrier spacing and acknowledgementegative acknowledgement-less (ACK/NACK-less) retransmission to reduce the user-plane latency and improve the packet success probability, in this trial. We evaluate the URLLC coverage for several packet sizes using our prototype test-bed. The results show that URLLC requirement in 3GPP can be achieved in UL even when SNR is approximately -3.1 dB. Furthermore, we clarify that the requirement can be satisfied with 25 km/h mobility.