NAS is a set of protocols used to convey non-radio signaling between the UE and the core network, passing transparently through radio network. The responsibilities of NAS include authentication, security control, mobility management and bearer managementNarrowband IoT (NB-IoT) is a Low Power Wide Area Network (LPWAN) technology standardized by 3GPP to allow for mass IoT deployments. NB-IoT technology utilizes existing LTE infrastructure to enable extended coverage area without compromising device battery life as well as economically viable. NB-IoT (Narrowband Internet of Things) builds upon the existing LTE network structure, but it is simplified and optimized for low data rates, massive device connections, and long battery life. It leverages existing cellular infrastructure, operating in licensed spectrum, which provides reliability but introduces dependence on mobile network. Radio Peripheral) device to modulate and demodulate the signals exchanged with the devices at the cellular radio frequencies. The USRP device is supported by a wide varie y of protocol stacks, many with roots in GNU Radio, which makes it an ideal COTS solution for a low-cost NB-IoT base tation. In. This page covers the NB-IoT Protocol Stack, also known as the LTE-NB Protocol Stack. 3GPP has introduced NB-LTE, a narrowband cellular IoT solution utilizing a 200 KHz Bandwidth. This technology is commonly referred to as.