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
