An anti-interference approach in high-speed railway scenario based on dynamic spectrum adjustment

The 4th generation mobile communication system with Orthogonal Frequency Division Multiplexing (OFDM) as the core technology faces great challenges in high-speed railway scenario. One of them is the serious interference between the high-speed railway wireless network (HSRWN) dedicated to serve the communication demands of the train and the overlapping macro long term evolution (LTE) network, and another is the extremely low spectrum utilization efficiency of HSRWN. In order to solve these two problems, we propose an approach called dynamic spectrum compression and extension (DSCE), which is based on the sparsity and regularity of radio resource utilization of HSRWN in space, time and spectrum occupancy. The basic idea of DSCE is that the macro system co-located with HSRWN takes necessary measures to avoid mutual-interference after it collects related statistical status information and predicts when the train will pass as the schedule of the train is not completely random, and compensates for the loss caused by this avoidance when the train leaves. Similarly, the DSCE could be applied in the light railway, inter-city express railway and so on. Simulation results show that this method can remarkably reduce the interference to HSRWN as well as significantly improve the spectrum utilization efficiency of HSRWN.