QoS-aware User Association and Transmission Scheduling for Millimeter-Wave Train-ground Communications

TL;DR

This paper proposes a coalition game-based algorithm for user association and transmission scheduling in millimeter-wave train-ground communications, significantly improving throughput and QoS adherence in high-speed railway scenarios.

Contribution

It introduces a novel coalition game approach to optimize user association and scheduling in mm-wave train-ground systems with full-duplex relays, addressing an NP-hard problem.

Findings

Enhanced system throughput demonstrated in simulations

Increased number of users meeting QoS requirements

Algorithm convergence and stability proven

Abstract

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.