Duplicated transmission based-resource scheduling for uplink grant-free SCMA system  

作　　者：Xiao Jiali Nie Gaofeng Deng Gang Tian Hui Zhang Chong 

机构地区：[1]School of Information and Communication Engineering,Beijing University of Posts and Telecommunications,Beijing 100876,China [2]National Radio and Television Administration,Academy of Broadcasting Science,Beijing 100102,China

出　　处：《The Journal of China Universities of Posts and Telecommunications》2020年第2期1-9,共9页中国邮电高校学报（英文版）

基　　金：supported by National Natural Science Foundation of China(61801046)。

摘　　要：Sparse code multiple access-based uplink grant-free transmission(SCMA-UGFT)has been proposed to realize ultra reliable and low latency communication(URLLC)in the fifth generation(5 G)system.Without the process of resource request and grant,users may collide in the same resource.To compensate the potential user performance decline,resource scheduling becomes a tough issue in the SCMA-UGFT system.This article proposes a duplicated transmission-based resource scheduling(DTBRS)scheme for SCMA-UGFT system by considering the URLLC scenario.Different from the existing schemes,not only one shared basic transmission units(BTUs)are allocated to a user equipment(UE)in the proposed DTBRS scheme for initial transmission to realize the duplicated transmission and to guarantee the transmission reliability.Besides,according to the proposed DTBRS scheme,one or two exclusive BTUs are assigned to a UE for retransmission to avoid the re-collision.At last,each packet is given a lifetime to limit the transmission latency to meet the URLLC latency requirement.The simulation demonstrates that the DTBRS scheme can achieve a better performance than the existing state-of-the-art scheme in terms of the average packet drop rate.

关 键 词：grant-free SCMA resource scheduling URLLC 

分 类 号：TN929.5[电子电信—通信与信息系统]