An improved scheduling scheme for high-speed rail scenario where onboard-train users and ordinary users coexist

As an important radio resource management scheme in wireless cellular network, scheduling plays an important role in balancing the system throughput and user fairness. This paper studies the scheduling scheme in a special scenario, where the ordinary users and onboard high-speed train users are co-served by the same basestation (BS) in cellular network. Orthogonal frequency-division multiple-access (OFDMA)-based cellular communication systems such as the Third-Generation Partnership Project (3GPP) long-term evolution (LTE) is considered, thus the radio resources are scheduled in both frequency and time domains among different users. In the addressed scenario, it is shown that none of the max C/I, round robin (RR), proportional fair (PF) algorithms can provide good performance in terms of user fairness. Therefore, a new scheduling algorithm based on the original PF scheme is proposed, which not only improves the user fairness greatly but also causes no degradation to the system throughput. The performance of the proposed scheme is simulated and compared with other scheduling schemes in terms of both system throughput and user fairness.