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.
Highlights
The rapid advance and breakthrough of wireless technologies are well supporting the establishment of pervasive wireless infrastructure
To derive the maximum numbers of admissible users, we develop a comprehensive analytical framework to evaluate the achievable performance
A Nakagami fading channel with AMC is considered for the wireless wide area networks (WWAN) link, whereas the contentionbased Wireless local area networks (WLAN) link is characterized by a state-dependent birth-and-death process
Summary
The rapid advance and breakthrough of wireless technologies are well supporting the establishment of pervasive wireless infrastructure. Red Ball Internet (http://www.redballinternet.com) is another solution for high-rate data connectivity in mobile hotspots It employs IEEE 802.20 broadband wireless access with high-capacity spatial division multiple access (HC-SDMA). A link adaptation scheme is developed in [4] for the WiMAX-based downlink of the mobile hotspot between the WiMAX BS and the AP mounted in the vehicle. Both the BS and AP are equipped with the multiple input and multiple output (MIMO) antenna system. The proposed adaptation algorithm selects an appropriate burst profile for the MIMO transmission mode and the modulation and coding settings to maximize downlink throughput Another linklayer solution for mobile hotspots is discussed in [5].
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