Journal of Computer Applications ›› 2018, Vol. 38 ›› Issue (11): 3270-3274.DOI: 10.11772/j.issn.1001-9081.2018040849

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Analysis and design of uplink resource scheduling in narrow band Internet of things

CHEN Fatang, XING Pingping, YANG Yanjuan   

  1. School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
  • Received:2018-04-25 Revised:2018-07-12 Online:2018-11-10 Published:2018-11-10
  • Supported by:
    This work is partially supported by the Chongqing Innovation Special Project for Common Key Technologies of Key Industries (cstc2017zdcy-zdzx0030).CHEN Fatang, born in 1965, M. S., professor. His research interests include algorithm simulation and software of mobile communication physical layer.

窄带蜂窝物联网终端上行资源调度的分析与设计

陈发堂, 邢苹苹, 杨艳娟   

  1. 重庆邮电大学 通信与信息工程学院, 重庆 400065
  • 通讯作者: 邢苹苹
  • 作者简介:陈发堂(1965-),男,重庆人,研究员,硕士,主要研究方向:移动通信物理层算法仿真及软件;邢苹苹(1993-),女,江西瑞昌人,硕士研究生,主要研究方向:移动通信协议;杨艳娟(1992-),女,山西吕梁人,硕士研究生,主要研究方向:移动通信物理层。
  • 基金资助:
    重庆市重点产业共性关键技术创新专项(cstc2017zdcy-zdzx0030)。

Abstract: Narrow Band Internet of Things (NB-IoT) technology is developing rapidly. Compared with the original wireless communication, the spectrum bandwidth of NB-IoT is only 180 kHz. Therefore, how to use resources or spectrum more efficiently (ie. resource allocation and scheduling) becomes a key issue for NB-IoT technology. In order to solve this problem, the related factors of NB-IoT uplink resource scheduling were analyzed, including resource allocation, power control and uplink transmission gap, and different options for comparison to select the optimal scheme were provided. In addition, modulation and coding scheme and the selection of the number of repeated transmissions were also analyzed in detail. A greedy-stable selection modulation and coding strategy based on different coverage levels and power headroom report were proposed, with which modulation and coding level was initially selected. A compensation factor was introduced to select the number of retransmissions and the update of the modulation and coding level. Finally, the proposed scheme was simulated. The simulation results show that the proposed scheme can save more than 56% of the activity time and 46% of the resource consumption compared with the direct transmission method.

Key words: Narrow Band Internet of Things (NB-IoT), uplink scheduling, resource allocation, modulation and coding, repeated transmission

摘要: 窄带蜂窝物联网(NB-IoT)技术发展迅猛,与原有的无线通信协议相比,NB-IoT的频谱带宽仅有180 kHz,因此,如何更有效地使用资源或频谱(即资源分配和调度)成为NB-IoT技术的关键问题。针对该问题,对NB-IoT上行链路资源调度的相关因素,其中包括资源分配、功率控制以及上行传输间隙进行了分析,并提供不同选择方案以选择出最优的方案;另外,针对调制与编码方案和重复传输次数的选择进行了重点分析,提出基于不同的覆盖等级联合功率余量报告的贪婪-稳定选择调制与编码策略以初步选择调制与编码级别,在选择重复传输次数时引入了一个补偿因子以衡量重传次数的大小以及对调制与编码等级更新;最后,对所提出方案进行了仿真分析。仿真结果表明,所提方案与直接传输方法相比,平均可节省超过56%的活动时间和46%的资源消耗。

关键词: 窄带蜂窝物联网, 上行链路调度, 资源分配, 调制与编码, 重复传输

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