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LTE NB IoT channel types | Downlink, Uplink signals and channels

This page covers LTE NB IoT channel types. It mentions LTE-NB IoT signals and channels used in the downlink (NPSS, NSSS, NRS, NPBCH, NPDCCH, NPDSCH) and uplink (DMRS,NPRACH,NPUSCH) directions.

NB-IoT LTE Channel Types

• LTE NB IoT consists of physical signals and physical channels.
• Physical signals are used for system synchronization, cell identification and channel estimation.
• Physical channels are used for transporting control, scheduling and to carry user payloads from higher layers.
• NB-IOT uses OFDMA in the downlink and SC-FDMA in the uplink direction in physical layer.
• It supports FDD and TDD modes of operation.

The figure mentions signal and channel types used in LTE-NB or NB-IoT technology both in the downlink and uplink directions.
➤NPSS: It stands for Narrowband Primary Synchronization Signal.
➤NSSS: It stands for Narrowband Secondary Synchronization Signal.
➤NRS: It stands for Narrowband Reference Signal.
➤NPBCH: It stands for Narrowband Physical Broadcast Channel.
➤NPDCCH: It stands for Narrowband Physical Downlink Control Channel.
➤NPDSCH: It stands for Narrowband Physical Downlink Shared Channel.
➤DMRS: It stands for Demodulation Reference Signal which is used in the uplink direction.
➤NPRACH: It stands for Narrowband Physical Random Access Channel.
➤NPUSCH: It stands for Narrowband Physical Uplink Shared Channel.

NB-IoT Related Stuff


This tutorial section on LTE basics covers following sub topics:
LTE tutorial  LTE features  LTE terminologies  Frame  TDD FDD  Channel types  PHY  stack  throughput  CA   cell search  network entry  Timers  PSS vs SSS  Security   LTE Bands  EARFCN  Hotspot  router  What is VoLTE  VoLTE originating call flow  VoLTE UE attach and registration procedure 

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