ZTE Communications ›› 2018, Vol. 16 ›› Issue (4): 46-51.doi: 10.19729/j.cnki.1673-5188.2018.04.007

• Research Paper • Previous Articles     Next Articles

Energy Efficiency for NPUSCH in NB-IoT with Guard Band

ZHANG Shuang1,2, ZHANG Ningbo1,2, KANG Guixia1,2   

  1. 1. Key Laboratory of Universal Wireless Communications (BUPT), Ministry of Education, Beijing 100876, China
    2. Science and Technology on Information Transmission and Dissemination in Communication Networks Lab, Beijing 100876, China
  • Received:2017-11-27 Online:2018-11-27 Published:2020-04-28
  • About author:ZHANG Shuang (zhangshuang2015@bupt.edu.cn) received the M.S. degree from Hebei Normal University, China. She is a Ph.D. candidate at Beijing University of Posts and Telecommunications, China. Her research interests include heterogeneous networks, energy efficient transmission and non-orthogonal multiple access.|ZHANG Ningbo (nbzhang@bupt.edu.cn) received the Ph.D. degrees at Beijing University of Posts and Telecommunications (BUPT), China in 2010. He worked in Huawei Technology from 2010 to 2014. He is currently an assistant professor of BUPT. His major research interests include wireless communication theory, machine to machine communications, multiple access, cognitive radio, and signal processing.|KANG Guixia (gxkang@bupt.edu.cn) is a professor and Ph.D. tutor at Beijing University of Posts and Telecommunications, China. She is currently the group leader of the Ubiquitous Healthcare Working Group of China’s Ubiquitous Network Technologies and Development Forum, the executive vice director of E-Health Professional Commission of China Apparatus and Instrument Association, one of the four domestic smart medicine specialists of China Smart City Forum, and a member of ITU-R 8F-China Working Group. Her research interests include wireless transmission technologies in PHY and MAC layers. Besides, she is the founder of wireless eHealth and works on its technology, standardization and application.
  • Supported by:
    This work was supported by the National Natural Science Foundation of China under Grant No(61501056);National Science and Technology Major Project of China under Grant No(2016ZX03001012);ZTE Industry-Academia-Research Cooperation Funds

Abstract:

Narrowband Internet of Things (NB-IoT) has been proposed to support deep coverage (in building) and extended geographic coverage of IoT. In this paper, a power control scheme for maximizing energy efficiency (EE) of narrowband physical uplink shared channel (NPUSCH) with the guard band is proposed. First, we form the optimization problem based on the signal model with the interferences of narrowband physical random access channel (NPRACH) which are caused by the non-orthogonality of NPUSCH and NPRACH. Then, a method of reserving guard bands is proposed to reduce these interferences. Based on it, an efficient iterative power control algorithm is derived to solve the optimization problem, which adopts fractional programming. Numerical simulation results show that NPUSCH with the guard band has better performance in EE than that without the guard band.

Key words: NB-IoT, energy efficiency, NPUSCH, NPRACH, interference, guard band