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 chapter6.2.5)
➢ NB-IOT vs eMTC vs legacy LTE
LTE R9
NB-IoT
系统带宽
1.4M/3M/5M/10M/15M/20M
200kHz
工作模式
full duplex FDD/TDD
half-duplex FDD
最大传输速率
DL: 150Mbps; UL 50Mbps
DL/UL: < 200kbps
频带部署方式
LTE 授权频段
带内，带外，保护带三种部署方式
覆盖范围(MCL)
~145dB
164dB
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