Multimedia services scheduling optimization using femtocell on high-speed trains

摘要

Nowadays, it is well-known that the LTE (Long Term Evolution) networks have greatly tackled the Doppler effect problem at the physical layer since they are capable of achieving a 100 Mbps data throughput on a high-speed moving vehicle up to 350 km/h within the same cell (i.e. no handover is allowed). However, there are still cases where vehicles are moving at very high speeds and thus frequent handovers across cells are inevitable, such as high-speed trains, which have been constructed rapidly all over the world in recent years. Therefore, how to maintain good link quality and schedule multimedia services optimally on high-speed trains remains challenging. In this paper, we propose a novel optimal LTE-based multimedia-service-scheduling and resource-allocation mechanism for highspeed trains, which could maximize the service rate and maintain a good service quality at the same time. This new scheme makes use of the seamless handover mechanism by carefully organizing the cell array along the railroad and aggregating the data (at the femtocell) from different users within the train cabins. Besides, we also project to schedule the multimedia services and allocate the network resources as fair as possible for all the users on the train. The simulation results justify the effectiveness of our proposed new scheme.