Research Article
Spring Model-Based Call Admission Control Mechanism for High-Speed Railway Environment
@INPROCEEDINGS{10.1109/ChinaCom.2011.6158339, author={Yisheng Zhao and Xi Li and Hong Ji}, title={Spring Model-Based Call Admission Control Mechanism for High-Speed Railway Environment}, proceedings={1st International ICST Workshop on Wireless Communications for High Speed Rail}, publisher={IEEE}, proceedings_a={HSR COM}, year={2012}, month={3}, keywords={high-speed railway; call admission control; spring model}, doi={10.1109/ChinaCom.2011.6158339} }- Yisheng Zhao
Xi Li
Hong Ji
Year: 2012
Spring Model-Based Call Admission Control Mechanism for High-Speed Railway Environment
HSR COM
IEEE
DOI: 10.1109/ChinaCom.2011.6158339
Abstract
Call admission control in mobility environment is a challenging issue. For high-speed railway environment, call admission control mechanism needs to be designed in order to admit more users when system bandwidth resource becomes scare. In this paper, a call admission control mechanism based on spring model is proposed. Although system bandwidth resource is occupied by existing users, a part of bandwidth resource can still be borrowed from them on condition that their lowest qualities of service could be guaranteed. Therefore, every existing service is regarded as a spring that can be compressed to some extent. Handover users who have higher priority than new users can be admitted by the above bandwidth resource borrowing strategy. Moreover, birth-death process is used to analyze dropping probability and blocking probability. Simulation results show that dropping probability of handover users is lower than blocking probability of new users. In addition, dropping probability of voice service is lower than that of data and video services.