Connectivity maximization for narrowband IoT systems with NOMA
Connectivity maximization for narrowband IoT systems with NOMA
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DOI：
10.1109/icc.2017.7996362
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发表时间：
2017-05
期刊：
影响因子：
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通讯作者：
A. Mostafa;Yong Zhou;V. Wong
中科院分区：
文献类型：
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作者：
A. Mostafa;Yong Zhou;V. Wong
窄带物联网（NB-IoT）是一项最近标准化的技术，用于支持LTE-A专业网络中的机器类型通信（MTC）。NB-IoT可以为低成本MTC设备（mtcd）在180 kHz的窄带宽上扩展覆盖范围，从而实现节能通信。在LTE-A Pro网络中支持MTC的主要挑战是为大量mtcd提供连接。为了克服这一挑战，本文提出了一种用于NB-IoT系统的功率域上行非正交多址（NOMA）方案。通过允许多个mtcd共享同一子载波，NOMA可以提供比正交多址（OMA）更多mtcd的连接。为了最大限度地满足服务质量（QoS）和传输功率要求，我们提出了一种联合子载波和传输功率分配问题。我们将该问题分解为两个子问题，并提出了求解它们的算法。仿真结果表明，与OMA相比，我们提出的NOMA方案可以显著增加NB-IoT系统中mtcd的成功连接数量。
Narrowband Internet of Things (NB-IoT) is a recently standardized technology to support machine-type communications (MTC) in Long Term Evolution-Advanced (LTE-A) Pro networks. NB-IoT can enable energy-efficient communication with extended coverage on a narrow bandwidth of 180 kHz for low-cost MTC devices (MTCDs). The main challenge of supporting MTC in LTE-A Pro networks is to provide connectivity to a massive number of MTCDs. To overcome this challenge, in this paper, we propose a power-domain uplink non-orthogonal multiple access (NOMA) scheme for NB-IoT systems. By allowing multiple MTCDs to share the same sub-carrier, NOMA can provide connectivity to more MTCDs than orthogonal multiple access (OMA). We formulate a joint sub-carrier and transmission power allocation problem to maximize the number of MTCDs satisfying the quality of service (QoS) and transmission power requirements. We decompose the problem into two sub-problems and propose algorithms to solve them. Simulation results show that our proposed NOMA scheme can significantly increase the number of successfully connected MTCDs in NB-IoT systems compared to OMA.