Downlink data rate gain provided by a mobile relay for LTE-advanced

In this paper, the data rate gain provided by a mobile relay deployed in a public transportation system is analyzed and calculated. The analysis is based on the Shannon formula modified for LTE. Through the analysis we get the conclusion that the data rate gain provided by mobile relay is not guaranteed in all cases. The penetration loss between outdoor and in-vehicle is a key factor to decide whether mobile relay could bring data rate gain into the system. Normally when UE is far away from donor eNodeB, the attached UE in relay case could achieve higher data rate than traditional case. Besides, the performance of the scenario with two antennas installed on vehicle is evaluated.