What is iSIM or Integrated SIM?
SIM cards in the 1990s were the size of a credit card! Just imagine how far they have traveled down the lane. SIM cards have exhibited a captivating evolution, channeling the latest technologies and delivering the present-day miniature SIM form factor- The Integrated SIM.
While the discussion on iSIM got started around 2015–16, the integrated SIMs got more traction in the real world when IoT and connectivity pioneers started their work toward building commercial units.
The introduction of the first-ever GSMA-compliant iSIM with the GSMA Remote SIM Provisioning standard by Qualcomm Technologies and the announcement of iSIM/iUICC SIMs by G+D marks the growing iSIM inclusion surge over the years in commercial as well as cutting-edge IoT applications.
Integrated SIM, popularly known as iSIM helps you take cellular connectivity a step further by curtailing the dependence on removable SIMs and embedded SIMs.
What is iSIM?
iSIM is the groundbreaking form factor in the SIM revolution. iSIM (Integrated SIM) is the iUICC (integrated universal integrated circuit card) enabled SIM, built within the processor using the system-on-chip (SoC) design.
It is enclosed in a Tamper Resistant Element (TRE) inside this dedicated space in the main processor and acts as a data bank for critical credentials. It is fully compatible with all cellular technologies from 2G, 3G, 4G, and 5G.
Integrated SIM cards elevate the SIM structure by integrating a SoC design. It amps up the connectivity game- guided by eSIMs eliminating the need for separate chips for SIMs. It also reduces the module footprint and imparts a sleek and compact design to IoT devices when compared to those incorporating physical SIMs.
iSIM Architecture- Explained
The integrated SIM replicates the specification and certification of the integrated eUICC given by the GSMA. The System-on-a-Chip (SoC) architecture for iSIM generally comprises a microcontroller, cellular modem, and SIM card. The SIM card houses the SIM operating system, applications, and a secure processor/ vault, which safeguards sensitive data like mobile subscription identifiers.
The secure processor of an iSIM constitutes the following components:
- CPU for secure processing
- OTP or One-Time Programmable stores configuration and per-device keys
- ROM-Read Only Memory to store the firmware — Root of trust
- RAM contains the executable code and data
- Crypto Block carries out secure cryptographic operations
Benefits of iSIMs
iSIMs offer compact designs for IoT solutions.
- iSIMs have a reduced physical footprint, enabling efficient use of internal space. It allows the optimization of internal components, facilitating the addition of more functional modules within a reduced space.
iSIMs are power-efficient making the overall performance stand out
- iSIM card operates without the need for an additional microprocessor and derives its power directly from the System on Chip (SoC). The reduced power requirements result in prolonged battery life, cutting down the need for battery replacements.
iSIMs are scalable and cost-effective solutions for all IoT applications.
- iSIM technology is a reliable solution for all IoT solution architects with 3x reduced BOM and swift time to market. Furthermore, the solution promotes sustainability by eliminating the need for extra housing or plastic, making it the greenest SIM solution.
Closing Notes
With major cellular technology trendsetters and IoT industry pioneers engaging with advanced technologies, further development processes are rolling out from this domain. The upgraded security measures like IoT SAFE (IoT SIM Applet For Secure End-to-End Communication) impart greater security across the latest SIM technologies. The xSIM (iSIM & eSIM) active connections are projected to grow 63% CAGR in the next 5 years (2023 -2028) forecasting its exponential demand in M2M and consumer applications.
To learn more, visit us at
https://www.cavliwireless.com/iot-modules/cellular-modules.html
Amusing Tech Chronicles
Facts and Anecdotes related to this edition of Wireless By Design
Qualcomm iSIM
Qualcomm Technologies, Inc. and Thales, announce the world’s first commercially deployable iSIM on the Snapdragon® 8 Gen 2 Mobile Platform in February 2023.
The Monarch 2 LTE-M/NB-IoT Chip
Sequans Communications rolled out the industry’s first cellular IoT chip with GSMA-compliant integrated iSIM (iUICC) in December 2021.
The Invisible Librarian
iSIMs are invisible librarians managing device connections and shelving profiles with ultimate precision and activating the read mode of profiles when required.
