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Dr George Oikonomou

Dr George Oikonomou

Dr George Oikonomou


Area of research

Internet of Things Networking and Security

Office 5.09 MVB
Merchant Venturers Building,
Woodland Road, Clifton BS8 1UB
(See a map)

+44 (0) 117 954 5175


My research focuses on energy-efficient networking for severely constrained wireless embedded devices and the IoT, with an emphasis on digital healthcare and smart city applications. My objective is to invent and prototype algorithms that are optimised for constrained/low-capability, battery-powered devices without sacrificing performance and reliability. Over the last few years I have been focussing on IEEE 802.15.4 / .15.4g networks, doing work that covers the entire 6LoWPAN/RPL stack. More specifically, I have made contributions in the areas of multicast forwarding; MAC layers with time-synchronisation (such as TSCH); congestion control; routing; neighbour discovery; service discovery. Within the same IoT context, I am also interested in secure software writing techniques; digital forensics; and software defined networking.

My research is very applied and often leads to high-TRL, deployment-ready outputs. A lot of my work has been released as open source software and is distributed as part of the Contiki-NG operating system for the Internet of Things, an open-source project of which I am a co-founder and steering group member. Most of the work is also part of the original Contiki OS, for which I used to serve as maintainer.

Key Contributions to Research Projects

I am Co-I in SPHERE, an EPSRC IRC on the development of sensors for the home to diagnose and help manage health and wellbeing conditions. The technology aims to aid early diagnosis, lifestyle change and the ability of patients to live at home. I am leading the "Design, Integration and Monitoring" work package; my team and I have delivered the overall architecture of the SPHERE system that is currently being deployed and tested in 100 participant properties in and around the Bristol area. I have also made a key contribution to the hardware and software/firmware design of SPHERE's in-house-developed wearable device, environmental sensor and low-power gateway.

Previously, I was Co-I for RERUM (FP7/2007-2013 grant n° 609094) on the design and implementation of a security framework for the IoT, driven by the requirements of Smart City applications. In addition to research papers and other outputs, I made a key contribution to the hardware and software/firmware design of a novel IoT hardware platform, which is now commercially available.

I was also affiliated with the (now concluded) ForToo project, an ISEC 2010 action grant on the development of advanced forensic tools against Internet abuse, with focus on forensic analysis of android devices and wireless sensors.

I am a member of the CSN and DHE research groups and I am affiliated with Crypto. I am also a member of the Smart Internet Lab.

Open Source Software

I am a co-founder, steering group member and maintainer of Contiki-NG, the next generation, open source operating system for the IoT. I have contributed the code which adds support for IPv6 / 6LoWPAN multicast and I am maintaining the hardware ports for the Texas Instruments CC2538 and CC13xx/CC26xx Cortex M3-based SoCs.

I am also the inventor of Sensniff, an open source "Live Traffic Capture and Sniffer for IEEE 802.15.4 networks", and one of the collaborators with cc2538-bsl, an open source serial boot loader project.

PhD Opportunities

I am currently looking for exceptional students to undertake PhD research under my supervision. If you are interested in working on one of these topics and you meet the requirements on skills and qualifications shown below, please get in touch with me:

More details about all those topics in this page. I am currently not accepting MSc by Research (MScR – MRes) applications.

Fees and Funding: You will enrol on the “Electrical and Electronic Engineering PhD” programme. We charge an annual tuition fee; you can find detailed information about fees in this page. Funding is not currently available for these PhD topics, but you may be eligible to apply for a scholarship. For more information see the section entitled “Faculty scholarships” in this page. I also welcome applications from students who have already secured funding from different sources (e.g. government, industry, current employer).

Required Skills and Qualifications:

  • You will have or be on track of obtaining a 1st or upper 2nd class (or overseas equivalent) undergraduate degree (BSc, BEng, MEng) or an MSc with Distinction (or overseas equivalent). Your degree will be in Electrical and Electronic Engineering, Computer Science or similar discipline from a reputable higher education institution.
  • As part of this PhD research, you will be required to write extensive code using the C programming language. You will have prior experience with C, either professional or as part of your final-year / postgraduate project.
  • You will be familiar with the basics of TCP/IP networking.
  • You will be familiar with the basics of the Unix command line interface and shell scripting.
  • Some knowledge of Python is desirable.

How To Apply: Please submit a PhD application using the University’s online application system. In the application form mention the project title/topic above and list me under “Proposed supervisor(1)”.

Research Group and Other Memberships: You will join the Electrical and Electronic Engineering department and you will become a member of Communication Systems and Networks, a large research group with long-standing track record on wireless communications, the Internet of Things, Massive MIMO, Intelligent Transport Systems, dynamic mmWave networks, full duplex communications and a number of other areas. This will provide you with access to CSN’s state-of-the-art testing and measurement equipment, world-leading laboratory facilities and unique software capabilities. You will be expected to support the activities of the CSN Group, including contributing to the supervision of MSc Research Students, attending and presenting your research at international conferences, and writing research papers on the outcomes of your research. As a CSN researcher, you will also become a member of the Smart Internet Lab, an initiative that builds on Bristol's strategic research in communications and digital technologies to create a hub for Internet Research with long lasting benefits for society and the economy.

PhD Completions

My Post-Doctoral Researchers

Current PhD and EngD Students

More Links


Lecturer in IoT Networking, with 7 years of post-doctoral research experience in the UK (University of Bristol and Loughborough University). Originally a statistician, with an MSc in Information Systems and PhD in Computer Networking from the Department of Informatics at the Athens University of Economics and Business.

Co-founder, steering group member and maintainer of Contiki-NG, the next generation, open source operating system for the IoT. Maintainer of the original Contiki OS. Inventor of the Sensniff open source software project. cc2538-bsl collaborator.

IoT Enthusiast, Software Developer, Open Source & Creative Commons proponent.

More Links:

[ Faculty Page ] [ Departmental Page ]


I am currently involved with the teaching of units related with introductory as well as advanced computer networking topics.

I am also Examinations Officer for the Department of Electrical and Electronic Engineering.


  • Internet of Things
  • Wireless Sensor Networks
  • Energy-Efficient Networking for Embedded Devices
  • IoT Forensics
  • Secure Software for Wireless Embedded Devices



Department of Electrical & Electronic Engineering

Other sites

Recent publications

View complete publications list in the University of Bristol publications system


Dr Oikonomou currently teaches 3 courses:

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