Retransmission Schemes for 5G Radio Interface
Cong Shi, Andreas Bergström, Erik Eriksson, Pål Frenger, Ali Abbas Zaidi · 2016
The standardization of 5G radio interface has started in 3GPP since April 2016. For the design of retransmission schemes, some requirements such as flexible timing, low overhead, and fast feedback have already been identified. Considering these design requirements, the retransmission mechanisms for single-hop and multi-hop 5G scenarios are presented in this paper. A novel protocol for the HARQ/ARQ is proposed, that is designed to be not only fast and low-overhead but also reliable and does not require fixed timing relationships. Several RLC ARQ protocol architectures are also analysed for the multihop/self-backhaul scenarios. The results demonstrate that relay RLC protocol is a promising candidate for multi-hop scenarios.