A New HARQ Scheme for 5G Systems via Interleaved Superposition Retransmission

作     者：Qianfan Wang Li Chen Xiao Ma Qianfan Wang;Li Chen;Xiao Ma

作者机构：School of Computer Science and EngineeringGuangdong Key Laboratory of Information Security TechnologySun Yat-sen UniversityGuangzhou 510006China College of Computer ScienceJiaying UniversityMeizhou 514015China School of Electronics and Information TechnologySun Yat-sen UniversityGuangzhou 510006China 

出 版 物：《China Communications》 (中国通信（英文版）)

年 卷 期：2023年第20卷第4期

页      面：1-11页

核心收录：

学科分类：0810[工学-信息与通信工程] 08[工学] 0804[工学-仪器科学与技术] 080402[工学-测试计量技术及仪器] 

基　　金：supported by the National Natural Science Foundation of China(No.61971454 and No.62071498) the Guangdong Basic and Applied Basic Research Foundation(No.2023A1515011056)。 

主　　题：5G NR HARQ LDPC codes superposition retransmission 

摘      要：Within the framework of the 5G new radio(NR),we propose a new hybrid automatic repeat request(HARQ)scheme to improve the throughput performance.The difference between the proposed scheme and the conventional one lies in the first retransmission,where the erroneous coded block group is interleaved and superimposed(XORed)onto a fresh coded block group.At the receiver,an iterative message-passing decoding algorithm can be employed to recover the target erroneous code block group(CBG).Only when the superposed retransmission fails,the conventional incremental redundancy(IR)or repetition redundancy(RR)retransmission is initiated.In any case,since the first retransmission is along with but has negligible effect on the fresh CBG,it costs neither transmitted power nor bandwidth.Monte-Carlo simulation results reveal that the presented HARQ schemes can achieve throughput improvements up to 10%over block fading channels and up to 50%over fast fading channels in comparison with the original 5G CBG-level HARQ scheme but without excessively increasing the implementation complexity.