NB-IOT protocol collection
1. NB-IOT基本概念
? Improved indoor coverage, support for massive number of low throughput devices,
low delay sensitivity, ultra low device cast, low device power consumption ? NB-IOT should support 3 different modes of operation：
? ‘Stand-alone operation’ utilizing for example the spectrum currently being used by GERAN
systems as a replacement of one or more GSM carriers, as well as scattered spectrum for potential IoT deployment. ? ‘Guard band operation’ utilizing the unused resource blocks within a LTE carrier’s guard-band ? ‘In-band operation’ utilizing resource blocks within a normal LTE carrier
? 180kHz UE RF bandwidth for both downlink and uplink
? 上行支持15kHz和3.75kHz两种subcarrier spacing；下行仅支持15kHz 的sub-carrier
spacing
? 3.75kHz 只支持single-Tone； 可以提供更大的覆盖，CP较长，对timing要求放松了； ? 更小的功耗
? 仅支持type-B half-duplex FDD operation(type-B定义参考3GPP 36.211 R13 chapter 6.2.5)
? NB-IOT vs eMTC vs legacy LTE
系统带宽 工作模式 最大传输速率 频带部署方式 覆盖范围(MCL) 子载波间隔 LTE R9 1.4M/3M/5M/10M/15M/20M full duplex FDD/TDD DL: 150Mbps; UL 50Mbps LTE授权频段 ~145dB DL/UL: 15kHz NB-IoT 200kHz half-duplex FDD DL/UL: < 200kbps 带内，带外，保护带 三种部署方式 164dB DL: 15kHz, UL: 15kHz or 3.75kHz 传输模式 同步信号 随机接入 解调信号 上下行信道探测 TM1-TM9 PSS/SSS Preamble/RAR/MSG3/MSG4 DL: CRS UL: DMRS 下行CSI， 上行SRS PDSCH QPSK, 16QAM, 64QAMP 1/3 turbo coding TM1/TM2 (单天线或双天线发送分集) NPSS/NSSS，构造以及相对间隔都与R9 PSS/SSS不同 NPRACH/NPDSCH DL: NRS UL: NDMRS 没有CSI， 没有SRS NPDSCH QPSK 1/3 Tail biting convolutional coding 单个或多个子帧传输一个传输块 NPDCCH 占用单独的下行子帧，类似于EPDCCH DCI Format N0/N1/N2 NPUSCH 15kHz or 3.75kHz sub-carrier spacing 1/3 turbo coding 以Resource Unit(可以跨多个子帧)作 为传输块的传输单位 UL-SCH 和 UCI 在不同子帧发送 PSM, eDRX 下行数据信道 单子帧传输一个传输块 PDCCH 和PDSCH在同一个子帧，占用前几个OS DCI Format 0/1/1A/2/2A/3/3A… PUSCH 15kHz sub-carrier spacing 1/3 turbo coding 单子帧传输一个传输块 下行控制信道 上行数据信道 省电技术 UL-SCH和UCI在同一个子帧发送 DRX
? eMTC can only be deployed within LTE system, while NB-IoT has more flexibility as it
can be deployed in-band, guard band and standalone. ? NB-IoT can support up to 200k devices per cell per 200kHz
? The NB-IoT uplink transmission (3.75kHz, 15kHz) is much more efficient than eMTC
wideband uplink transmission ? NB-IoT has about 6.3dB better coverage than eMTC
In-Band 操作的一些特殊处理？？？
? Symbols and abbreviations
ULNslots
Number of consecutive slots in an UL resource unit for NB-IoT
2. 36.211-d20
2.1 Uplink(10.1)
2.1.1 Uplink Physical channels and signals(10.1.1.1)
The following narrowband physical channels are defined: - Narrowband Physical Uplink Shared Channel, NPUSCH - Narrowband Physical Random Access Channel, NPRACH
The following uplink narrowband physical signals are defined: - Narrowband demodulation reference signal
Comment: 新增上行信道NPUSCH和NPRACH，新增上行信号NDMRS；
LTENBIOT协议介绍
