  With the development of wireless communication, people have put forward
higher requirements for train-ground communications in the high-speed railway
(HSR) scenarios. With the help of mobile relays (MRs) installed on the roof of
the train, the application of Millimeter-Wave (mm-wave) communication which has
rich spectrum resources to the train-ground communication system can realize
high data rate, so as to meet users' increasing demand for broad-band
multimedia access. Also, full-duplex (FD) technology can theoretically double
the spectral efficiency. In this paper, we formulate the user association and
transmission scheduling problem in the mm-wave train-ground communication
system with MR operating in the FD mode as a nonlinear programming problem. In
order to maximize the system throughput and the number of users meeting quality
of service (QoS) requirements, we propose an algorithm based on coalition game
to solve the challenging NP-hard problem, and also prove the convergence and
Nash-stable structure of the proposed algorithm. Extensive simulation results
demonstrate that the proposed coalition game based algorithm can effectively
improve the system throughput and meet the QoS requirements of as many users as
possible, so that the communication system has a certain QoS awareness.
