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.
Highlights
There is an increasing demand for high bandwidthconsuming services such as real-time video and video streaming over wireless access networks [1,2]
A multi-homed heterogeneous wireless network gives multimode terminals (MTs) the flexibility to be simultaneously connected to more than one radio access technology (RAT). Such simultaneous connections entails that packet stream of a scalable call will be split among multiple RATs in the heterogeneous wireless network
Falowo and Chan [9] proposed an adaptive joint call admission control (JCAC) and bandwidth management scheme for heterogeneous wireless networks with collocated cells. They developed an analytical model for the proposed scheme and evaluated its performance in terms of new call blocking probability (NCBP), handoff call dropping probability, and resource utilization
Summary
There is an increasing demand for high bandwidthconsuming services such as real-time video and video streaming over wireless access networks [1,2]. Such simultaneous connections entails that packet stream of a scalable call will be split among multiple RATs in the heterogeneous wireless network This flexibility can be exploited to improve connection-level QoS (call blocking/dropping probability) for high-bandwidth consuming applications such as multi-layer video. Falowo and Chan [9] proposed an adaptive JCAC and bandwidth management scheme for heterogeneous wireless networks with collocated cells They developed an analytical model for the proposed scheme and evaluated its performance in terms of new call blocking probability (NCBP), handoff call dropping probability, and resource utilization. The article proposes a JCAC scheme that reduces call blocking/dropping probability by selecting multiple RATs for an incoming call when none of the available single RATs has enough bandwidth to accommodate the incoming call. To the best of authors’ knowledge, this is the first JCAC scheme using multiple RAT selection and scalable call splitting for reducing call blocking/dropping probability in heterogeneous wireless networks.
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