Overview of Common IoT Communication Technologies

Communication technologies are the foundation of the Internet of Things (IoT), enabling the interconnection of countless devices.

Wired Communication Technologies

Ethernet is divided into two layers: the PHY layer, which converts digital signals to analog for transmission, and the MAC layer, which handles media access control within the data link layer.

RS‑232 and RS‑485 are introduced and compared, followed by an overview of M‑Bus (Meter Bus), a serial bus designed for utility metering and industrial energy‑consumption data collection, supporting long‑distance, low‑cost networking of hundreds of devices.

Short‑Range Wireless Technologies

Bluetooth offers up to 1 Mbps data rate over 10 cm–10 m (extendable to 100 m), with high security and low power consumption but limited node count.

Wi‑Fi provides broadband WLAN connectivity in the 2.4 GHz and 5 GHz bands, offering wide coverage and high data rates, though it suffers from security, stability, and higher power consumption issues.

ZigBee is a low‑power, low‑complexity, self‑organizing protocol for short‑range applications in industrial and smart‑home domains.

Z‑Wave is a low‑cost, low‑power, reliable RF solution with simple architecture, but its chips are sourced from a single vendor.

Cellular Mobile Networks

2G (GSM) introduced digital mobile communication with a data rate of 9.6 kbps; GPRS extends GSM to 56–114 kbps.

3G supports several standards (CDMA2000, WCDMA, TD‑SCDMA) with downlink speeds up to 42 Mbps (HSPA+).

4G (TD‑LTE, FDD‑LTE) delivers >100 Mbps, integrating 3G and WLAN capabilities.

5G offers theoretical peak speeds up to 10 Gbps and supports eMBB, mMTC, and uRLLC use cases.

Low‑Power Wide‑Area (LPWA) Technologies

SigFox uses ultra‑narrow‑band (UNB) modulation for ultra‑low power, long‑range links (up to 1 km) and can support up to 1 million devices per base station.

LoRa (Long Range) provides bidirectional communication under the LoRaWAN protocol, suitable for smart metering, home automation, and industrial monitoring.

NB‑IoT is a narrow‑band IoT solution built on existing GSM/UMTS/LTE networks, offering low power, wide coverage, and low cost.

eMTC, proposed by Ericsson, delivers up to 1 Mbps with deeper coverage than NB‑IoT but higher power consumption.

eLTE‑IoT, a Huawei solution, targets enterprise narrow‑band IoT using sub‑1 GHz ISM bands and integrates with existing enterprise platforms.

Comparative Summary

The article concludes with comparative tables and diagrams summarizing the characteristics, advantages, disadvantages, and evolutionary trends of wired, short‑range wireless, cellular, and LPWA technologies for IoT deployments.