Dear friends,

Today I write this post to talk about one of our new ventures: www.theiot.es.

What is this?

A new website and blog related to the IoT, with particular focus on wireless technology and applications.


There is so much information out there in the Internet related to the IoT that it becomes sometimes hard to keep focus on what is really worth reading. I personally spend lots of time in surfing the web and twitter to discover really worthy news and information related to the IoT.

After some random thoughts, I decided to set up a website with that information that I think is very interesting and relevant related to the IoT. And this is www.theiot.es.

What will be there?

– Links to interesting companies, alliances, products, etc.

– A Blog and Video Blog with entries written by myself talking about topics related to the IoT.

– A blog with entries written by contributors; these are people I trust which I would love to invite to contribute to the website. If you’re interested in becoming a contributor, drop me an e-mail at “thinkaboutthetiot@gmail.com“.

Hope to see you around!



Long Range WPAN Extensions in ns-3

Dr. Tatjana Predojev, formed PhD Candidate at CTTC, has released today part of her work carried out over the last 4 years while conducting her PhD Thesis on Long Range Low Power Wireless Technologies.

She extended the lr-wpan code of ns-3 to introduce duty-cycling based on Time Division Multiplex Access (TDMA) which resembles the Time Synchronized Channel Hopping (TSCH) protocol proposed in:

IEEE Standard, “Low rate wireless personal area networks (LR-WPANs) amendment 1: MAC sublayer,” IEEE Standard 802.15.4e, 2012.

The implementation includes all Medium Access Control (MAC) features except for the the channel hopping.

The repository of the code is now public and you are welcome to use it:


In concrete, the most significant changes introduced are in the following modules:

=> implemented packet acknowledgements (ACKs), duty-cycling, link scheduler
refactored code to introduce MAC state

=> implemented log-normally distributed, time-correlated shadowing

Aris Gkoutzos , an undergraduate student supervised by Dr. Predojev, implemented


A detailed description of the implemented algorithm can be found in the open access journal:

T. Predojev, J. Alonso-Zarate, M. Dohler, and L. Alonso, Energy Consumption Optimisation for Duty-Cycled Schemes in Shadowed Environments, International Journal of Distributed Sensor Networks, Hindawi, http://dx.doi.org/10.1155/2014/709135, 2014.

There are no guarantees for any functionality, nor was the standard implemented in detail.
Nevertheless, we hope someone will find it useful.


A member of our M2M team has been Awarded by KTH (Sweden)

Charalampos Kalalas, member of our M2M team, has been awarded with the KTH ISSLS 2000 Foundation Scholarship in Sweden.

Charalampos has been awarded on November 2014 with the Swedish ISSLS 2000 Foundation Scholarship of KTH for the M.Sc. Thesis Project “Enabling LTE for Control System Applications in a Smart Grid Context”.

The purpose of the foundation is to facilitate scientific research and education within the telecommunication area, specifically those areas which are or will be of importance for the development of various types of access networks. Relevant for this grant is also education within adjacent fields that are of importance for the continuing developments of communication based services.

The scholarship is awarded to students that excel in a distinguished way through a degree project at the M.Sc. level which is well executed, insightful and of high quality. The results from the project should furthermore be expected to make a valuable contribution to the development of various types of access networks or the development of services for communication networks.

Charalampos Kalalas is now a Marie Curie fellow within the research project ADVANTAGE (FP7-607774), hosted by CTTC, and is currently pursuing his PhD in ICT technologies for the Smart Grid at the PhD Program of the Department of Signal Theory and Communications of the Universitat Politècnica de Catalunya (UPC).


4,000 downloads of a book chapter!

Science and research is about impact. This can be measured in many different ways. A typical one consists is counting the number of citations of a given publication. Unfortunately, in some cases this might be tricky due to the use of self-citations (citations by the same author) and the creation of communities of scientists citing each other because of other reasons beyond scientific connection. Another measure of impact is the number of times that a paper, when freely available to the audience (open-access) has been accessed and downloaded from different IP connections (in order to avoid robots accessing a given paper many times).

Today, one of our papers, written in collaboration with Cristian Crespo and Dr. Luis Alonso from Universitat Politècnica de Catalunya in the year 2011, has reached the hit of 4,000 downloads. Wow!!

The research work is entitled “Hybrid Access Techniques for Densely Populated Wireless Local Area Networks” and belongs to the entire book entitled “Advances in Vehicular Networking Technologies”, published by IN-TECH. This chapter describes the design of a novel Medium Access Control (MAC) protocol for Wireless Local Area Networks (WLANs) which can boost the performance of so-called WiFi networks when the number of connected devices is very high. This becomes particularly relevant in dense deployments, as it can be the case of vehicular networks (networks of cars, essentially), or the Internet of Things (IoT).

The paper can be accessed in the following link:

The book can be accessed in the following link:

Let’s keep the spirit!


I am very happy to announce that we have been awarded with the Best Demo Runner-Up Award at the prestigious IEEE International Conference on Computer Communications (IEEE INFOCOM) 2014 with a research demo entitled: “Demonstrating Low-Power Distributed Queuing for Active RFID Communications At 433 MHz”.

Authors: Pere Tuset-Peiró, Francisco Vazquez-Gallego, Dr. Jesus Alonso-Zarate, Dr. Luis Alonso and Dr. Xavier Vilajosana, joining efforts from Centre Tecnológic de Telecommunications de Catalunya (CTTC), Universitat Oberta de Catalunya (UOC), and Universitat Politècnica de Catalunya (UPC).

The demo consists of a wireless Machine-to-Machine (M2M) dense network communicating at 433MHz, where a novel Medium Access Control (MAC) protocol has been implemented. This demonstration shows that it is possible to go away from the widely used variations of ALOHA and CSMA protocols (used in WiFi, Zigbee, 3G, LTE technologies), and overcome their well-known congestion problems. With the use of Distributed Queuing (DQ) solutions, it is possible to achieve performance which is independent of the number of devices in a network and is close to the theoretical maximum capacity of a wireless channel. One of the reasons why these solutions are not yet in the market is the number of technological challenges that remain still open to make this technology available. The research group has been working over the last years to solve all these challenges and this demo represents a major breakthrough to show that we are not that far from seeing DQ in the market and changing the way we operate wireless networks as they become denser. This technology is deemed to become a true enabler for the advent of the Internet of Things.

Related links:

About the authors:

PhD Open Positions at CTTC within a Marie Curie Action

Hi people!

At CTTC we are running a Marie Curie Initial Training Network. What is this? An exceptional opportunity for young researchers to pursue a PhD, create an enormous network of contacts, have fun doing a PhD in coordination with 12 other Early Stage Researchers (ESRs), and…yes, get a very very competent salary for the next 3 YEARS.

The project is about ICT for SMART GRIDS, and here you have all the information: http://www.fp7-advantage.eu

At CTTC we are offering 3 PHD POSITIONS, and one of them will be supervised by me; the one on M2M communications. Check this out:

Any question?

just drop me an e-mail: jesus.alonso@cttc.es

Keep in touch!


Hello World!

Hello World!

I have read somewhere that you are no one if you are a tech-guy and you do not have a blog.

This is quite similar to the trend that says that you are not a good tourist if you do not take pictures with either a huge tablet or with a super-pro Nikon or Canon Camera with a tripod.

Therefore, I have decided to create this blog.

I hope I can keep this alive and be somehow either useful or interesting. In the very worst case, I will use this site to keep updated my professional activities as a researcher and entrepreneur.

I will mainly write about technology, but also about anything that either interests me or concerns me about any topic; economics, politics, sports, music, anything.

Hope to see you around.