Analysis of Satellite and Terrestrial Telecommunication Link Availability to Improve Security and Attractivity in Urban Buses

Mobility is still growing and the key challenge for sustainable mobility, in urban areas, is how to match the increasing demand for transport and the need to reduce the impact of the use of private vehicle on the physical, social and human environment. It is urgent to promote the use of collective means of transport by improving the security feeling inside public transport and proposing new attractive services for passengers such as multimedia information. Such services require wireless radio link transmissions in bi-directional with high data rate. The main problem is that, nowadays, terrestrial communication systems such as GSM/GPRS have a limited data rate and flow decreases significantly in case of mobility and transfer of data in full safety. Moreover, for such urban transports application, UMTS is not available now and satellite systems are not used yet. This paper aims at demonstrating that a satellite-based system radio link can answer this problem with the use of terrestrial wireless communication systems as a complementary solution, in bad satellite coverage areas. We study along urban Bus lines, the availability of satellite and terrestrial systems, which is one of the conditions that make it possible to guarantee the continuity of radio link communication along these ways.