Abstract
In this paper, the secure transmission for high-speed railway (HSR) communication system is studied. The considered HSR wireless communication system consists of a macro base station, B roadside base stations, and K vehicle stations (VSs) on the top of the train, and the eavesdropping user is a mobile unmanned aerial vehicle (UAV). We consider maximizing the sum of the minimum security rate of each time slot as the objective function, and the constraint conditions contain the quality of service (QoS), switch requirements and the total power constraint. The original optimization problem is mixed-integer and non-convex, it is intractable to solve directly. The block coordinate descent (BCD) method is applied, and the original problem can be decoupled into two sub-problems. The one is the joint BS-VS association problem, and the other is the power control problem. The first sub-problem of optimizing BS-VS association can be solved by the successive convex approximation (SCA) algorithm, and the second one of optimizing transmit power can be solved by the lagrangian dual method. Simulation results show that the proposed algorithms have good convergence.
Highlights
As a kind of comfortable, fast, and safe traffic tool, the application of high-speed railway (HSR) has attracted the extensive attention in many countries
A heterogeneous cellular network consisting of a macro base station (MBS) and B roadside base stations (RBS) is considered to communicate with K single antenna Vehicle stations (VS) installed on the train roof, where all RBSs are deployed at regular intervals in the coverage area of MBS and all base station (BS) are configured with single antenna
4.1 Parameters setting In this subsection, we present numerical results to validate our analysis and demonstrate the effectiveness of the proposed algorithms
Summary
As a kind of comfortable, fast, and safe traffic tool, the application of high-speed railway (HSR) has attracted the extensive attention in many countries. The widespread popularity of HSR poses a severe challenge to the HSR communication service of train operation and passenger communication service [1, 2]. In order to ensure the safety of train operation, the train multimedia dispatching, railway emergency communication and HSR line condition monitoring based the broadband railway communication system are becoming more and more important [3]. It is necessary to provide high-quality voice services, video services, and Internet access for passengers on the train [4]. In order to satisfy the requirements of the data transmission rate in HSR communication, the broadband mobile communication system
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