Most important full time research project participation since 2000. Brief project and role description.

1/2005 – 6/2010 ΑΝΑ (Autonomic Network Architecture, IST-27489)

Project brief description: Research in the area of autonomic networking. The principle idea of this IP FET project of the EC was to study, investigate and build a new communication paradigm for the future Internet. Scalability was one of the main concerns throughout this project, being challenging during all phases (study, design and implementation).
Specific role: Investigation and implementation of service discovery in the ANA environment (dynamic and typically large-scale). The investigation phase involved service placement (the reasons for which a service facility is initially located at some network location), service advertisement (inform some network nodes about the offered service) and service searching (complementary to advertisement).  These problems were shown to be NP-hard and therefore, approximate solution were studied in order to deal with scalability. Implementation in Linux kernel was followed in the ANA node environment.

1/2002 – 1/2005 BroadWAY (The way to broadband access at 60 GHz, IST-2001-32686)

Project brief description: Research in the area of ad hoc networks considering a dual band wireless system (HiperLAN/2) operating at two frequency bands: 5 and 60 GHz. This idea is effective in small distance environments like  dense urban and hot-spot areas allowing for increased data rates when operating at 60 GHz while at the same time maintaining the traditional WLAN long distance operation at 5 GHz. Under this project the dual mode of operation was investigated and the challenges with respect to the physical layer, MAC and routing where studied. In consequence,  a prototype implementation was followed.
Specific role: Investigation and implementation of a new ad hoc networks architecture capable of supporting the dual mode of operation and efficiently switching among both modes of operations. Under this architecture, mobile nodes where permitted to switch the the 60 GHz mode of operation based on their traffic characteristics and their proximity to other nodes. In order to support this mechanism, the 5 GHz standard mode of operation needed to be enhanced and several novel functionalities to be included mainly in the MAC layer.

5/2000 – 5/2003 HARMONICS (Hybrid Access Reconfigurable Multi-wavelength Optical Networks for IP-based Communication Services, IST-1999-11719)

Project brief description: A common dynamically reconfigurable fibre infrastructure is proposed, deploying flexible wavelength routing integrated with flexible time slot allocation in a new Medium Access Control protocol. This infrastructure feeds various last-mile access networks, and provides capacity on demand while accounting for Quality of Service requirements of user traffic. An adaptive resource manager supports the MAC protocol, and aligns traffic flows with core and last-mile network capabilities. Both a wireless HiperLAN/2 and a twisted-pair VDSL user access network enabling QoS-differentiated IP traffic will be set up. Novel optical modules will be developed, such as a fast flexible wavelength router. The results of architecture studies and techno-economic analyzes will be fed into consensus building activities and standardization bodies. After being validated in laboratory trials, the system will be operated in a field trial with real users and IP-based QoS-sensitive services.
Specific role: Investigation and implementation of a Quality of Service (DiffServ) enabled HiperLAN/2 WLAN system. Design and implementation of a convergence sublayer in Linux kernel to enable HiperLAN/2 to reserve resources as a last-mile technology. A proprietary service level agreement mechanism was designed and implemented.

Participation in other projects like Broadband IP (TCP extensions in Linux kernel for satellite environments), ROMANTIK (mesh networking for coverage extension), ADAMAS (protocol interoperability in OFDM environments), CASPIAN (Linux kernel device driver implementation for protocol stack emulation), E-NEXT and CONTENT (network of excellence).