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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
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