Servicio de Información Comunitario sobre Investigación y Desarrollo - CORDIS

Final Activity Report Summary - ERACLIN (Enhanced radio resource algorithms based on cross-layer issues for 4G networks)

During the last decade, a significant growth of digital wireless communications systems has been noted. It is worth mentioning that the research discipline of wireless communications is one of the areas that is undergoing major progress and developments.

Wireless networks have the traditional OSI layer-based architecture from wired networks, where each layer is worked out based on its parameters as a separate entity. Even though this consideration simplifies protocols' design and treatment, it seems to be suboptimal for wireless communication systems. Although a variety of Medium Access Control (MAC) schemes have been designed for wireless systems in order to manage the radio frequency spectrum resource and to provide certain Quality of Service (QoS) requirements to mobile users, the efficiency of such systems can be optimised when considering some vertical coupling between layers. The information exchange among layers in the OSI model called Cross-Layer and it has been shown that can significantly improve system's performance. ERACLIN project have been devoted to the study of several Cross-Layer Techniques for wireless communication systems. To be more precise, it has been demonstrated that the efficiency is increased, in terms of delay and throughput, when the proposed Cross-Layer techniques are applied in WLAN and UMTS based systems. The main goals of the Project included:

*Analysis different Cross-Layer techniques that can be used in order to enhance the efficiency of wireless communication systems.
*Deep study of the potential benefits that can be obtained from using these techniques in different environment. In particular, the explicit shift towards decentralised and adaptive MAC, Radio Resource Management and routing approaches.
* Analysis of the potential benefits of incorporating channel estimation information about the future channel state in the adaptability of all the layers.
* Analysis of the trade-off between signalling overhead and enhanced performance in cross-layer approaches.
* Analysis of the algorithms robustness against partial knowledge of channel state information, scalability issues for the solutions of convex optimisation problems.
* Dissemination project results contributing to technical journals and conferences in the course of the project lifetime.
Some new MAC protocols have been also proposed and their efficiency in the presence of CL techniques have been presented.

The aims of the Project have been achieved through mutually exchange experienced researchers. They had the opportunity to develop their knowledge by the integration of researchers in a different work environment, acquiring new knowledge and benefitting from this when the researchers return to their organisation of origin. The project provided of 20 months of ToK of researchers. Two Greek scientists visited UPC in Barcelona and they were working for a total of 14 months, while a Spanish researcher from UPC visited INA premises in Thessaloniki-Greece during 6 months and he produced attractive results working with the Greek scientists.

The scientific results of the project have presented in 9 publications (1 international journal paper and 8 international conferences), while other 7 papers have been submitted (2 in international journals and 5 in conferences). Furthermore, one book chapter has been accepted for publication in the next months. In addition, 5 papers are currently prepared in order to be submitted to international conferences.

Six internal meetings (4 in Spain and 2 in Greece) were organised over the 20 months of the project, where the involved researchers had the opportunity to be aware of the research activities in the local Institutions. Greek researchers also gave two invited talks to Master Students in Barcelona, while UPC researcher was following INA Academy activities in SouthEastern Europe Area. Furthermore, the visiting researchers gave three high level presentations for the members of the host Institutions.

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