IoT technology - internet of things

IoT nb1 vs nb2 Devices Comparison

IoT nb1 vs nb2 Devices Comparison, Narrow Band IoT specifications were first introduced in 3GPP release 13 and then further enhanced in 3GPP release 14 with some essential features. Release 13 NB-IoT device category is referred to as Cat NB1 or Cat N1 and Release 14 devices are referred to as Cat NB2 or Cat N2.

IoT nb1 vs nb2 Devices Comparison.

ParameterCat. NB1Cat. NB2
3GPP Release SpecificationRelease 13Release 14
Operation ModeFDDFDD
No. of Rx Antenna11
Tx Power Class20, 23 dBm14, 20, 23 dBm
Maximum Channel Bandwidth180 KHz180 KHz
Highest Modulation for UL and DLQPSKQPSK
Downlink Spatial Layers11
Maximum DL Transport Block (TBS)680 bits2536 bits
No. of HARQ Processes1up to 2
Peak DL Physical Layer Data Rate226.7 Kbps282 Kbps
DL channel coding typeTai Bit Convolutional Coding (TBCC)Tai Bit Convolutional Coding (TBCC)
Physical Layer Memory Requirement2112 soft channel bits7680 soft channel bits

Additionally Cat NB2 devices has following features which are not available in Cat NB1

  • Support of Positioning of Device using OTDOA
  • Mobility enhancement from seamless cell re-selection
  • Push to talk voice messaging
  • New Device Power Class (14 dBm)
  • Multicast transmission