# LwM2M Introduction
LwM2M protocol is Lightweight M2M protocol organized and established by OMA, mainly for IoT applications based on the narrow band cellular Internet of Things (NB-IoT) scenarios, focus on low power and wide coverage (LPWA) Internet of Things (IoT) market, is an emerging technology that can be widely used in the world. It has the features of wide coverage, multiple connections, low speed, low cost, low power consumption and excellent framework and other characteristics.
NB-IoT has 4 major fcharacteristics:
Based on NB-IOT LWM2M protocol and CoAP protocol, the communication between UE and OneNET platform is realized. The transmission layer protocol in data transmission protocol is CoAP, and the application layer protocol is LwM2M protocol.
Coap protocol has the following characteristics:
The LWM2M protocol is applicable to lightweight protocol, a various IoT devices. LWM2M defines three logical entities:
LWM2M protocol (NB-IoT) is a lightweight M2M protocol with retransmit mechanism based on UDP protocol. and mainly for IoT applications based on the narrow band cellular Internet of Things (NB-IoT) scenarios, focus on low power and wide coverage (LPWA) Internet of Things (IoT) market, is an emerging technology that can be widely used in the world.
It is widely applicable to the environment where power demand is low, high coverage depth, massive terminal device connection and sensitive device cost. And can be widely used in application scenarios such as intelligent parking, intelligent meter reading, intelligent manhole covers, intelligent streetlights, etc.