Resource Allocation for Millimeter-Wave Train-Ground Communications in High-Speed Railway Scenarios

With the development of wireless communication, higher requirements arise for train-ground wireless communications in high-speed railway (HSR) scenarios. The millimeter-wave (mm-wave) frequency band with rich spectrum resources can provide users in HSR scenarios with high performance broadband multimedia services, while the full-duplex (FD) technology has become mature. In this paper,we study train-ground communication system performance in HSR scenarios with mobile relays (MRs) mounted on rooftop of train and operating in the FD mode. We formulate a nonlinear programming problem to maximize network capacity by allocation of spectrum resources. Then, we develop a sequential quadratic programming (SQP) algorithm based on the Lagrange function to solve the bandwidth allocation optimization problem fortrack-side base station (BS) and MRs in this mm-wave train-ground communication system. Extensive simulation results demonstrate that the proposed SQP algorithm can effectively achieve high network capacity for train-ground communication in HSR scenarios while being robust to the residual self-interference (SI).

Automated summary

This paper discusses the performance of train-ground communication systems in high-speed railway scenarios using mobile relays operating in the full-duplex mode and millimeter-wave frequency band. A nonlinear programming problem is formulated to optimize spectrum resource allocation and a sequential quadratic programming algorithm is developed based on the Lagrange function. Simulation results show the proposed algorithm achieves high network capacity and is robust to residual self-interference.