Abstract
Cloud radio access network (C-RAN) is considered as a promising architecture for 5G with advantages of green energy, convenient resources allocation. In this paper, we explore the feasibility of C-RAN for high-speed railway (HSR) scenarios. A novel phenomenon of group handover is defined in the extensively and densely distributed railway network and we present a resource migration cost with a closed-form expression to depict the group handover. To reduce the cost, we propose a novel connection relationship between the remote radio head (RRH) and the baseband unit (BBU) pool. Based on this, we establish a flexible network so as to allocate the resource dynamically and formulate a graph by abstracting the RRH-BBU and BBU-BBU mapping relationship. Then the minimization of resource migration cost along the high-speed train (HST) routine is converted into the shortest path problem (SPP). By using the modified Floyd-Warshall algorithm, the SPP can be solved with high efficiency compared with the conventional algorithm. Finally, the simulation result shows that the proposed mechanism can decrease the resources migration cost significantly.
Highlights
The proliferation of China’s high-speed railway (HSR) enhances the quality of rail services, yield greater customer satisfaction and help to create socioeconomically balanced societies [1]
The main contributions of this paper are summarized as follows: 1) We present a phenomenon of group handover when the high-speed train (HST) passes across different baseband unit (BBU) pools
WORK In this paper, we investigated the feasibility of Cloud radio access network (C-RAN) in HSR scenarios and define a new group handover for longdistance railway communication
Summary
The proliferation of China’s high-speed railway (HSR) enhances the quality of rail services, yield greater customer satisfaction and help to create socioeconomically balanced societies [1]. Zhong reviewed the stateof-art radio resource management methods in [6] These works lay a great foundation for the research and design of HSR communication. B. Han et al.: Research on Resource Migration Based on Novel RRH-BBU Mapping in C-RAN for HSR Scenarios. With quite a few other means of transportation being under construction or preparation, how to provide a reliable access for HST becomes a critical challenge when deploying wireless networks along the high speed railways. A phenomenon of handover occurs as the HST travels across different BBU pools This problem will be addressed in detail in this paper. The main contributions of this paper are summarized as follows: 1) We present a phenomenon of group handover when the HST passes across different BBU pools. The summarization of this paper as well as the future work will be described in the final section
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