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.
• 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
➤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
LTE RELATED LINKS
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
Difference between LTE Advanced vs LTE Advanced Pro vs 5G Links
What is Difference between
difference between FDM and OFDM
Difference between SC-FDMA and OFDM
Difference between SISO and MIMO
Difference between TDD and FDD
Difference between 802.11 standards viz.11-a,11-b,11-g and 11-n
OFDM vs OFDMA
CDMA vs GSM