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Delay-Sensitive Applications in VANET and Seamless Connectivity: The Limitation of UMTS Network


Inthawadee Chantaksinopas, Wilaiporn Lee, Akara Prayote, Phoemphun Oothongsap


Vol. 12  No. 10  pp. 54-61


Multi-interface handheld devices enabling radio link connections to varieties of wireless networks (i.e 3G cellular, Wi-Fi, WiMAX) can provide seamless connectivity. With seamless connectivity, VANET safety applications are emerged. Currently, seamless connectivity has been promoted in 3G cellular environments offering a large coverage area and high bandwidth. Even though, 3G cellular networks offer high bandwidth, they may not support end-to-end delay guarantee which is the most important property of VANET safety applications. Thus, the purpose of this article is to investigate whether UMTS cellular networks can support seamless connectivity for delay sensitive applications in VANET. From the study, seamless connectivity for delay-sensitive applications is feasibly achieved in UMTS cellular network if a mobile is in CELL_DCH and CELL_FACH states. CELL_PCH and URA_PCH states might support most of applications except action games and safety applications. However, the UMTS network is not suitable for life-critical applications due to the short-lived duration of the CELL_DCH and CELL_FACH states. The inactivity timers of the CELL_DCH and CELL_FACH states possibly expired when the safety message transmission is needed.


seamless connectivity, delay-sensitive application, RRC states,VANET.