Partial Retransmission Scheme for HARQ Enhancement in 5G Wireless Communications
Jeongho Yeo, Sungjin Park, Jinyoung Oh, Younsun Kim, Juho Lee · 2017
In this paper, we propose a novel hybrid automatic repeat and request (HARQ) scheme for 5th generation (5G) enhanced mobile broadband (eMBB) systems that also support ultra-reliable and low latency communications (URLLC). The proposed scheme performs retransmission of the lost part of a data packet when URLLC traffic, e.g., accident alert signal on the road, is transmitted immediately upon its creation by puncturing a part of the current data packet to avoid delay. With the proposed scheme, it becomes possible to avoid the retransmission of whole data packet due to the error of a small part caused by the puncturing. The proposed partial retransmission can significantly improve the efficiency of wireless resource utilization taking into account that a single packet can occupy large amount of wireless resource for, e.g., support of 20 Gbps peak rate in 5G eMBB systems. Simulation results show that the proposed scheme provides significant performance improvement compared to the Long-Term Evolution (LTE) HARQ scheme performing retransmission of the whole packet.