Projet de recherche doctoral numero :2796


Date depot: 1 janvier 1900
Titre: Control of autonomous multi-mode terminals in heterogeneous and independent wireless environments
Encadrant : Christian BONNET (Eurecom)
Domaine scientifique: Sciences et technologies de l'information et de la communication
Thématique CNRS : Non defini

Resumé: Background Recent years have seen the explosion of mobile communications, together with an exponential use of the Internet for all sorts of applications such as voice calls, video conferencing or Mobile TV. As a consequence, the trend in the mobile technologies has been the conception of multimode devices, with an increasing number of interfaces, at the centre of fixed and mobile or telecom and broadcasting convergence. To address this issue, the IEEE 802.21 work group [1] has standardized a handoff process common to all the 802 media and that tentatively enables the mobility to and from 3G cellular systems. The standard, named Media Independent Handover (MIH) Services, introduces an intermediate abstraction layer that provides these services to the other functions and modules running in a mobile terminal. It has already been extended to allow the integration of other services such as quality of service [2], downlink-only technologies (e.g. DVB) or security. Emergency services, mesh networks or power management are future candidates to broaden the scope of this framework. On another hand, new technologies are being designed to overcome the limitations due to existing crowded spectrum without degrading the performance of existing users [3]. These technologies, based on cognitive wireless systems, aim to find and exploit unused spectral holes, and allow avoiding interference with non-cognitive systems, thus enhancing the transmission capabilities. Such systems introduce cross-layer constraints and control, where the spectrum availability is considered as a new system measurement parameter. Spectrum management is one example of the application of cognitive technologies. They bring in the conception of future architectures a totally new cognitive plane in addition to the traditional user and control planes. Research topic and progress beyond the state of the art The objective of this research topic is to design a global technological scheme, consisting in an innovative architecture and the associated protocols, for the control of autonomous multi-mode terminals and devices in heterogeneous and independent wireless environments. Such environments can be a mobile operator network, the local cafe hotspot or the user private home network. The plan is to enable a self-configuring terminal to connect and roam in any wireless environment as long as it owns sufficient security credentials in that environment. This is different from current systems where handover and operation control is under the responsibility of the single network. The target scheme implies a strong level of cross layer design taking into account generic constraints based on cognitive wireless systems and enabling generic services such as handovers, emergency broadcast services, session mobility or security. This is different from some existing technological trends such as 3GPP which tend to avoid the usage of abstraction layers or other trends which restrict the abstraction layer, when it exists, to a pre-defined set of constraints and services, once again under the control of a single network operator.

Doctorant.e: Bellaiche Michelle