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

doi:10.19682/j.cnki.1005-8885.2020.1001

中国邮电高校学报(英文) ›› 2020, Vol. 27 ›› Issue (2): 1-9.doi: 10.19682/j.cnki.1005-8885.2020.1001

• Wireless • 下一篇

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

Xiao Jiali, Nie Gaofeng, Deng Gang, Tian Hui, Zhang Chong

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

收稿日期:2019-06-27 修回日期:2020-05-11 出版日期:2020-04-30 发布日期:2020-07-07
通讯作者: Xiao Jiali, E-mail: 2013210694@bupt.edu.cn E-mail:2013210694@bupt.edu.cn
作者简介:Xiao Jiali, E-mail: 2013210694@bupt.edu.cn
基金资助:
This work was supported by National Natural Science Foundation of China (61801046).

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

Xiao Jiali, Nie Gaofeng, Deng Gang, Tian Hui, Zhang Chong

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

Received:2019-06-27 Revised:2020-05-11 Online:2020-04-30 Published:2020-07-07
Contact: Xiao Jiali, E-mail: 2013210694@bupt.edu.cn E-mail:2013210694@bupt.edu.cn
About author:Xiao Jiali, E-mail: 2013210694@bupt.edu.cn
Supported by:
This work was supported by National Natural Science Foundation of China (61801046).

摘要/Abstract

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 (5G) 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

Abstract: 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 (5G) 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.

Key words: grant-free, SCMA, resource scheduling, URLLC

Xiao Jiali, Nie Gaofeng, Deng Gang, Tian Hui, Zhang Chong. Duplicated transmission based-resource scheduling for uplink grant-free SCMA system[J]. The Journal of China Universities of Posts and Telecommunications, 2020, 27(2): 1-9.

参考文献

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

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

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