新兴窄带物联网技术NB-IoT

doi:10.11959/j.issn.2096-3750.2017.00028

Abstract

Abstract:

The newly developing low power wide area(LPWA) cellular data access requirements and challenges of Internet of Things is introduced,then the design principle and standardization progress of NB-IoT technologies are analyzed.At last,several typical NB-IoT applications are described.NB-IoT will be the most competent LWPA technology,since NB-IoT has five technical advantages:flexible deployment,wide coverage,low power consumption,low cost and massive connections.

Key words: NB-IoT, IoT, LPWA, standard, application

CLC Number:

TP393

Zhi-bin ZHENG,De CHEN,Hao WU. New developing narrow band IoT technology NB-IoT[J]. Chinese Journal on Internet of Things, 2017, 1(3): 24-32.

Figures/Tables 13

References 10

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信号带宽/kHz	20 dB覆盖增强工作点/dB
3.75	?5.7
15	?11.7
180	?22.5

性能指标	R14 NB-IoT	R14 eMTC
定位	标准化E-CID和OTDOA 2种定位方式，在OTDOA方式下设计了新的定位导频NPRS	标准化E-CID和OTDOA 2种定位方式，在OTDOA方式下，重用LTE UE的定位导频，并增强
多播	基于单载波点对多点（SC-PTM，single-cell point-to-multipoint）的多播支持	基于 SC-PTM 的多播支持。每个单小区多播传输信道（SC-MTCH）可支持1 Mbit/s (1.4 MHz带宽)或4 Mbit/s (5 MHz 带宽)的速率
移动性增强	UE 接入新基站后，数据可从原站转发到新站（CIoT EPS用户面优化），仍不支持切换	支持异频测量及切换
单用户峰值速率提升	新定义UE类型Cat-NB2：最大支持2个HARQ进程；对于Standalone配置，峰值速率为：DL：125 kbit/s；UL：140 kbit/s	新定义 UE类型 Cat-M2，最大支持5 MHz带宽。全双工FDD下，峰值速率：DL为4 Mbit/s；UL为7 Mbit/s
VoLTE增强	N/A	对于HD-FDD和TDD，增强了对VoLTE的支持，具体是增加PUSCH和SRS的重复，支持动态HARQ-ACK延迟
Massive Connection	在非锚点 NB-IoT PRB 传输 NPRACH（NB-IoT physical random access channel）及寻呼	N/A
New Power Class	支持14 dBm的最大发射功率，可以降低峰值电流，从而可以减少电池尺寸	N/A

性能指标	Sigfox	LoRa	EC-GSM	eMTC	NB-IoT
标准组织	非公开	公开	3GPP	3GPP	3GPP
频谱	非授权	非授权	授权	授权	授权
信道带宽	100 kHz	7.8~500 kHz	200 kHz	1.4 MHz	180 kHz
峰值数据速率	UL:100 bit/s	180 bit/s ~37.5 kbit/s	DL:74 kbps	DL:800 kbit/s	DL:234.7 kbit/s
	DL:600 bit/s		UL:74 kbps	UL:1 Mbit/s	UL:204.8 kbit/s
每天支持最大消息发送数	140(终端) 50 000(BTS)	50 000(BTS)	不受限	不受限	不受限
终端最大发送功率	14 dBm	14 dBm	26 dBm	23 dBm	23 dBm
最大耦合损耗值	UL:156 dB	UL:156 dB	164 dB	156 dB	164 dB
	DL:147 dB	DL:168 dB 或 132 dB
终端设备功耗	低	低、中	低	低、中	低

R13特性	R14特性	R15特性
多种部署方式：Standalone/ In-Band/ Guard-Band	定位增强：支持网络定位到50m精度	支持TDD
覆盖：+20 dB，UL ST/MT，3.75kHz/15 kHz	速率提升：峰值速率提升一倍	进一步降低时延、降低功耗
省电：PSM，eDRX	广播多播：可以支持软件批量升级等	增强Standalone Operation Mode
终端成本：半双工、QPSK、CP等	其他：QoS，多载波增强	NB-IoT的小站支持
		提升窄带测量的精度

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New developing narrow band IoT technology NB-IoT

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