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SONAS provides UNISONet,
a multi-hopping wireless technology designed for the next generation of IoT.

UNISONet is a field-proven implementation of the well-known "Concurrent-Transmission Flooding".
It enables high-quality
connections for IoT devices.

About CTF

In the field of wireless communication, people are deeply convinced that, when a device receives radio from multiple sources simultaneously, it is very likely to fail due to mutual interference. Hence, cumbersome rules for channel control were considered indispensable in multi-hopping networks.

However, in 2011, it was discovered that if it is the same data to be transmitted and the reception time is accurately aligned, the successful reception rates are high as if there is no interference. It was a great discovery that overturned that common believes.

Concurrent-Transmission Flooding (CTF) is a data transfer method that utilizes this phenomenon to create rapid message broadcastings in a multi-hopping network.

We provide UNISONet, a well-established and field-proven wireless standard based on CTF.

Features and Specs

UNISONet is the wireless standard
that meets the requirements of IoT wireless.

Stability

Robust connectivity
even where the radio wave condition is changing

Power saving

Runs on batteries for10 years
in power saving mode

High speed

Up to 24kbps (@2.4GHz)

Bidirection and low delay

Responds in 1 sec to the command

Bidirection and low delay

Responds in 1 sec to the command

100% reliability

Retransmission control mechanism
to prevent data loss

Time synchronization

Collects data at synchronized timing
within 10μs-level accuracy (@2.4GHz)

Massive connection

Connects hundreds of units to one network

Massive connection

Connects hundreds of units to one network

UNISONet Classic
(2.4GHz)

Physical layer　 : IEEE 802.15.4

Frequency band : 2.4GHz

Communication range of 1 hop : 500m

Sync accuracy : 10μs

Throughput : 10.4kbps (to 10 hop)
24kbps (to 4 hop)

UNISONet Leap
(920MHz)

Physical layer : Undisclosed

Frequency band : 920MHz

Communication range of 1 hop : ~2km

Sync accuracy : 30μs

Throughput : 4kbps (to 10 hop)
12kbps (to 4 hop)

UNISONet Metro
(920MHz)

Physical layer : Undisclosed

Frequency band : 920MHz

Communication range of 1 hop : ~5km

Sync accuracy : 100μs *Estimated

Throughput : To be provided

UNISONet-embedded devices

RF Module

UNISONet works by command with this module.

UNISONet-inside accelerometer

Enables time-synchronaized mesureaments at multiple points.

UNISONet-inside accelerometer

Enables time-synchronaized mesureaments at multiple points.

Link to the theses

The world's first paper showing that CTF is feasible

F. Ferrari, M. Zimmerling, L. Thiele and O. Saukh: “Efficient network flooding and time synchronization with glossy’’, Proc. IPSN (2011).
See this paper

The paper delving into the physical layer of CTF

C. H. Liao, Y. Katsumata, M. Suzuki, H. Morikawa: “Revisiting the so-called constructive interference in concurrent transmission’’, Proc. LCN (2016).
See this paper

M. Suzuki, Y. Yamashita, H. Morikawa: “Low-power, end-to-end reliable collection using glossy for wireless sensor networks’’, Proc. VTC Spring (2013).
See this paper

M. Suzuki, C. H. Liao, S. Ohara, K. Jinno, H. Morikawa: “Wireless-transparent sensing’’, Proc. EWSN (2017).
See this paper

The first paper to show the possibility of building a sensor network using CTF

F. Ferrari, M. Zimmerling, L. Mottola, L. Thiele: “Low-power wireless bus’’, Proc. SenSys (2012).
See this paper

The Japanese paper outlining SONAS's technology

M. Suzuki, T. Nagayama, S. Ohara, and H. Morikawa, ``Structural health monitoring using concurrent transmission flooding,'' IEICE Transactions on Communications (Japanese Edition), Vol.J100-B, No.12, pp.952-960(2017).
See this paper

SONAS provides UNISONet, a multi-hopping wireless technology designed for the next generation of IoT.

About CTF

Features and Specs

UNISONet-embedded devices

Link to the theses

SONAS provides UNISONet,
a multi-hopping wireless technology designed for the next generation of IoT.