Multiple-RAT selection for reducing call blocking/dropping probability in cooperative heterogeneous wireless networks
Journal Article
2012
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EURASIP Journal on Wireless Communications and Networking
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Springer
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University of Cape Town
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Abstract
There is an increasing demand for high bandwidth-consuming services such as real-time video and video streaming over wireless access networks. A single radio access technology (RAT) in a heterogeneous wireless network may not always have enough radio resource to admit high bandwidth-consuming calls, such as video calls. Existing joint call admission control (JCAC) algorithms designed for heterogeneous wireless networks block/drop an incoming call when none of the available individual RATs in the network has enough bandwidth to admit the incoming call. Consequently, video calls experience high call blocking/dropping probability in the network. However, some calls such as multi-layer coded (scalable) video can be transmitted/received over one or multiple RATs. This article proposes a JCAC algorithm that selects a single or multiple RATs for scalable video calls in heterogeneous wireless networks, depending on availability of radio resources in available RATs. Non scalable calls are always admitted into a single RAT by the algorithm. The aim of the proposed algorithm is to reduce call blocking/dropping probability for both scalable and non-scalable calls. An analytical model is developed for the proposed JCAC algorithm, and its performance is evaluated. Simulation results show that the proposed algorithm reduces call blocking/dropping probability in heterogeneous wireless networks.
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Reference:
Falowo, O. E., & Chan, H. A. (2012). Multiple-RAT selection for reducing call blocking/dropping probability in cooperative heterogeneous wireless networks. EURASIP Journal on Wireless Communications and Networking, 2012(1), 1-12.