دانلود رایگان مقاله بررسی ارتباطات راه آهن با سرعت بالا از دیدگاه مدیریت منابع رادیویی

Abstract

High-speed railway (HSR) communications will become a key feature supported by intelligent transportation communication systems. The increasing demand for HSR communications leads to significant attention on the study of radio resource management (RRM), which enables efficient resource utilization and improved system performance. RRM design is a challenging problem due to heterogeneous quality of service (QoS) requirements and dynamic characteristics of HSR wireless communications. The objective of this paper is to provide an overview on the key issues that arise in the RRM design for HSR wireless communications. A detailed description of HSR communication systems is first presented, followed by an introduction on HSR channel models and characteristics, which are vital to the cross-layer RRM design. Then we provide a literature survey on state-of-the-art RRM schemes for HSR wireless communications, with an in-depth discussion on various RRM aspects including admission control, mobility management, power control and resource allocation. Finally, this paper outlines the current challenges and open issues in the area of RRM design for HSR wireless communications.

6. Conclusions

Radio resource management is a powerful tool that enables high resource utilization and results in improved QoS performance. However, compared with common cellular communications, some characteristics in HSR wireless communications, such as high mobility, unique channel conditions and heterogeneous QoS requirements, impose some challenges to the RRM design. This leads to significant attention on the study of RRM under HSR scenarios. In this paper, we have provided a literature survey on HSR wireless communications from a perspective of RRM design. Firstly, we have presented an overview of the HSR communication systems with a detailed description of network architecture, railway applications and services as well as advanced transmission technologies. Then the HSR channel models and characteristics are introduced, which are vital to the cross-layer RRM design and optimization. Afterwards, we have surveyed the RRM schemes for HSR wireless communications, with an in-depth discussion on admission control, mobility management, power control and resource allocation. Finally, challenges and open issues on RRM design of HSR wireless communications have been outlined.