ABSTRACT
Voice and data communications on high
speed vehicles encounter bad channel condition,
high call drop rate, serious signaling congestion
and excessive power consumption of UE. Mobile
relay technology which features on-board relay
node is expected to improve the quality of service
for passengers. However, the design for
fixed relay in LTE-Advanced system cannot
meet the requirements of mobile relay. In this
article, the architecture for mobile relay is presented.
The key techniques of supporting mobile
relay are investigated, such as the group mobility,
the local service support, the multi-RAT and
RAN sharing, with the corresponding solutions.
The potential system optimization, for example,
the self-optimization network, power saving,
measurement and system information acquisition
are also presented where the efficiency of mobile
relay can further be improved. Simulation and
numerical results demonstrate the feasibility of
the mobile relay.