Sub-GHz Communication System

Sub-GHz Communication System

We offer IoT communication systems using Sub-GHz (e.g. 920 MHz band) communication modules. The IoT communication system enables the customization of communication specifications for various applications and is able to configure a system that integrates with multiple sensors without contracting for communication services.

Sub-GHz Communication System Overview

The system sends data from sensors paired with Sub-GHz communication modules to the cloud via gateways.
[Sensor -> Gateway in each area -> Cloud]

Features

  • 01

    Unique communication protocol

    SMK's original communication protocol uses the 920 MHz band. This communication protocol can customize the amount and rate of data transmission and develop software that is compatible with existing systems.

  • 02

    Communication range       

    With a transmission rate of 100 kbps, it is possible to communicate over a range of several tens to several hundreds of meters. An additional gateway allows data communication over even longer ranges.

  • 03

    Stable network connection

    Radio waves have desirable diffraction properties and immunity to interference. This means that they bend around obstacles and are less likely to be affected by other radio waves.

Use cases


  • Cart location, temperature and humidity control for warehouses

    The approximate locations of the carts and the temperature in a warehouse can be controlled by receiving data from the communication units via the gateway. Each communication unit has an embedded temperature sensor built into each cart to send data using the gateway's MAC address.

  • Store refrigerator temperature control

    The data collected by the temperature sensors inside the refrigerators or freezers that are made of metal or other materials can be sent periodically to the gateway outside these appliances.

  • Collective control of office lighting

    Collective control of office lighting, such as illuminance and on/off, is enabled by embedding a communication module in each luminaire.

　　　　　　　

  • Street light/street lamp failure detection

    Maintenance vehicles can collect abnormal signals from street lights or lamps with built-in communication modules via the individual vehicle gateway while driving.

　　　　　　　

Product specifications

  • Item Specifications
    External dimensions
    WｘDｘH
    (mm)    		 13.0ｘ13.0ｘ2.3
    Radio frequency 920.6 - 928.0MHz
    Transmission rate 100kbps
    Transmission power (Max.) +13dBm
    Receiver sensitivity (Typ.) -85dBm＠PER1％
    Interface UART
    Current consumption (Typ.) Transmit mode : 38mA
    Receive mode : 25mA
    Operating temperature -30～+85℃
    Power supply voltage 1.8～3.6V
    Antenna Can be chosen from 90 or more different types of antennas.
■What is Sub-GHz?

Sub-GHz is a unit of frequency and indicates frequencies below 1 GHz. In general, Sub-GHz bands are between 100 MHz and 1 GHz. Frequencies in this range are not susceptible to noise or other radio waves, and are used in various communications technologies and electronic devices.


Sub-GHz
Module
(920MHz)		 Bluetooth LE
(2.4GHz)		 Wi-Fi
(2.4/5GHz)		 LTE
Communication
range		 Positive
(several hundred m)		 Negative
(10m)		 Positive
(several hundred m)		 Positive
(several dozens of km)
*Radio wave
diffraction		 Positive Negative Negative Positive
Amount of
data transmission
and reception		 Small
(several kB)		 Large
 		 Large
 		 Large
 
Usage limits
(including communication fees, registration fees, and other fees)		 Positive
(None)
 		 Negative
(Alliance certification is required.)		 Negative
(Alliance certification is required.)		 Negative
(A flat communication fee is required.)
Customization of communication specifications Positive
(Can be customized upon request.)		 Negative
(Must comply with specifications.)		 Negative
(Must comply with specifications.)		 Negative
(Must comply with specifications.)

*Diffraction is the property of radio wave propagation that radio waves travel through space where there is no line of sight due to building corners or columns (see figure below).

 When radio waves are sent from behind a building where there is no visibility, they will bend around the corners of the building to be received.

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