In telecom protocol stacks, the highest stratum of the control plane between the core network and
User Equipment (UE). The layer is used to manage the establishment of communication sessions and
for maintaining communications with the UE as it moves.
nRF Cloud
Nordic Semiconductor's platform for connecting IoT devices to the cloud, viewing and analyzing
device message data, prototyping ideas that use Nordic Semiconductor chips, and more. It includes a
public REST API that can be used for building IoT solutions. See nRF Cloud (nrfcloud.com).
Personal Unblocking Key (PUK)
A digit sequence required in 3GPP mobile phones to unlock a SIM that has disabled itself after an in
correct personal identification number has been entered multiple times.
Power Saving Mode (PSM)
A feature introduced in 3GPP Release 12 to improve battery life of IoT (Internet of Things) devices by
minimizing energy consumption. The device stays dormant during the PSM window.
Protocol Configuration Options (PCO)
An element of Non-access Stratum (NAS) message used for transferring parameters between the UE
and the P-GW (Packet Data Network Gateway).
SEGGER Embedded Studio (SES)
A cross-platform IDE for embedded C/C++ programming with support for Nordic Semiconductor
devices, produced by SEGGER Microcontroller.
Subscriber Identity Module (SIM)
A card used in UE containing data for subscriber identification.
System in Package (SiP)
A number of integrated circuits, often from different technologies, enclosed in a single module that
performs as a system or subsystem.
Tracking Area Update (TAU)
A procedure initiated by the UE when moving to a new tracking area in the LTE (Long-term
Evolution) system.
User Equipment (UE)
Any device used by an end-user to communicate. The UE consists of the Mobile Equipment (ME) and
the Universal Integrated Circuit Card (UICC).
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