Chip combines functions for NB-IoT
Modem, processor, memory and global navigation satellite system (GNSS) functions are combined in a single chip, the Exynos i S111, from Samsung Electronics. It is a narrowband (NB) Internet of Things (IoT) device that is claimed to offer wide coverage, low-power operation, accurate location feedback and strong security. It is, continues Samsung, optimised for real-time tracking applications such as safety wearables or smart meters.
As the IoT grows, some connected devices share useful information instantly in high volumes, but some transmit data in small nuggets over a long period of time. Popular radio connectivity systems such as Bluetooth and ZigBee are suitable for short-range scenarios within confined spaces such as in the home or a building, and broadband communications are commonly used for mobile devices that demand high data rates. On the other hand, NB-IoT supports applications that require reliable low-power communication and wide-range coverage for small-sized data.
To cover long distances with high reliability, as a standard, NB-IoT adopts a data retransmission mechanism that continuously transmits data until a successful transfer, or up to a set number of retransmits. With a high number of these retransmit sessions, the S111 is able to cover the distance of 10km or more.
Exynos i S111 incorporates a modem capable of LTE Rel. 14 support that can transmit data at 127 kbits per second for downlink and 158kbits per second uplink, and can operate in standalone, in-band and guard-band deployments.
For long standby periods, the S111 utilises power saving mode and expanded discontinuous reception (eDRX), which keeps the device dormant for long periods of time (10 years and above), depending on application and use-cases. Exynos i S111 also has an integrated GNSS and supports observed time difference of arrival (OTDOA), a positioning technique using cellular towers, for highly accurate and seamless real-time tracking.
Transmitted data are kept secure and private as the S111 uses a separate security sub-system (SSS) hardware block along with a physical unclonable function (PUF) that creates a unique identity for each chipset, explains Samsung.