Call admission control for integrated multimedia service in heterogeneous mobile hotspots
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Call admission control for integrated multimedia service in heterogeneous mobile hotspots Wei Song1* , Peijian Ju1 and Yu Cheng2
Abstract Mobile hotspots are a promising trend to offer ubiquitous multimedia services even in public transit vehicles such as buses, trains, and airplanes. However, it is very challenging due to high mobility, fast channel fading, and stringent multimedia quality-of-service (QoS) constraints. Effective admission control is necessary to limit the admitted traffic so that accepted users are provided QoS guarantee. In this paper, we develop a comprehensive analytical framework for the performance of interactive data service and conversational video service in mobile hotspots with heterogeneous wireless technologies. We jointly consider the contention-based wireless local area network (WLAN) at the link layer, the highly varying wireless wide area network (WWAN) due to vehicle mobility and multipath fading, adaptive modulation and coding for the WWAN link at the physical layer, and batch packet arrivals of video traffic at the application layer. Based on the analytical approach, the maximum numbers of users are derived for QoS assurance. Simulation results verified the validity of the analysis. Numerical results demonstrated the effectiveness of the analytical approach for admission control and the effects of network parameters such as the traffic buffer size and the transmission distance. Keywords: Mobile hotspots, Video QoS, Markov-modulated fluid source, Adaptive modulation, Coding
1 Introduction The rapid advance and breakthrough of wireless technologies are well supporting the establishment of pervasive wireless infrastructure. Wireless local area networks (WLAN) are now widely deployed in hotspot areas, e.g., offices, airports, cafés, and hotels. The mainstream handheld wireless devices such as smartphones, laptops, and tablets are equipped with built-in WLAN interfaces. Internet access can be enabled by integrating the WLAN with wireless wide area networks (WWAN), such as the long-term evolution (LTE) cellular networks and IEEE 802.16 wireless metropolitan area networks, also known as WiMAX for worldwide interoperability for microwave access. The indoor hotspots usually serve slow-moving or static users in a residential or business environment. A
*Correspondence: [email protected] 1 Faculty of Computer Science, University of New Brunswick, Fredericton, Canada Full list of author information is available at the end of the article
natural evolution is to extend the hotspot service to moving vehicles such as buses, trains, and airplanes. Such a vehicular network is the so-called mobile hotspot, which consists of a group of end users that move as a whole in a public transit. Although there is no unified network architecture for mobile hotspots, Figure 1 illustrates a typical architecture based on existing wireless technologies [1,2]. A key network entity is the access point (AP) mounted in the vehicle to form a WLAN among a collection of wireless user terminals. A
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