Tuyển tập các báo cáo nghiên cứu khoa học ngành toán học được đăng trên tạp chí toán học quốc tế đề tài: An SNR-based admission control scheme in WiFibased vehicular networks | Kim et al. EURASIP Journal on Wireless Communications and Networking 2011 2011 204 http content 2011 1 204 o EURASIP Journal on Wireless Communications and Networking a SpringerOpen Journal RESEARCH Open Access An SNR-based admission control scheme in WiFibased vehicular networks Kihun Kim 1 Younghyun Kim1 Sangheon Pack1 and Nakjung Choi2 Abstract In WiFi-based vehicular networks the performance anomaly problem can be serious because different vehicles with diverse channel conditions access the channel by a random access protocol. In this article we first develop a novel analytical model which combines the vehicular traffic theory and WiFi properties to show the impact of performance anomaly at the intersection. We then propose a signal-to-noise ratio SNR -based admission control scheme that excludes vehicles with bad channel qualities to address the performance anomaly problem. Extensive simulation and analytical results are presented to show the effect of the traffic condition and the topology. From the simulation results it can be found that the SNR-based admission control scheme can improve the overall throughput and starvation issues can be addressed by means of mobility in WiFi-based vehicular networks with multiple intersections. Keywords performance anomaly WiFi-based vehicular networks SNR-based admission control mobility 1. Introduction Recently significant progress has been made in vehicular networks to support mobile users. Vehicular communications can be classified into vehicle-to-infrastructure V2I and vehicle-to-vehicle V2V communications. In terms of communication technology wireless local area network WLAN or WiFi 1 wireless wide area network WWAN 2 or their combination 3 can be used in vehicular environments. Even though the performance of WWAN has been improved over the past years its data rate is still limited compared with WLAN. Also WWAN typically adopts a meter-rate-dependent monetary cost policy which is a burden to
