Design and analysis of an adaptive guard channel based CAC scheme in a 3G-WLAN integrated network

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July 2010, 6(3): 621-639. doi: 10.3934/jimo.2010.6.621

Design and analysis of an adaptive guard channel based CAC scheme in a 3G-WLAN integrated network

Jae Man Park ^1, , Gang Uk Hwang ^1, and Boo Geum Jung ^2,

1.	Department of Mathematical Sciences, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, South Korea, South Korea
2.	Electronics and Telecommunications Research Institute (ETRI), Daejeon, South Korea

Received September 2009 Revised April 2010 Published June 2010

Abstract
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In wireless networks, guard channel based Call Admission Control (CAC) schemes are widely used to protect handoff calls for seamless wireless services. However, the introduction of guard channels in wireless networks results in the increase in the new call blocking probability. This general situation also occurs in a 3G-WLAN integrated network. To solve this problem in a 3G-WLAN integrated network for QoS support, we propose an adaptive guard channel based CAC scheme in this paper. The main objective of our guard channel based CAC scheme is to alleviate the increase in the new call blocking probability due to guard channels while it can still protect handoff calls. For the design of our adaptive guard channel based CAC scheme, we first develop and analyze a performance model for a general guard channel based CAC scheme based on a level-dependent quasi birth and death model. The analytic results are used to design our adaptive guard channel based CAC scheme. Numerical studies show that our adaptive guard channel based CAC scheme can achieve its objective and its performance is near optimal.

Keywords: quality of service, 3G-WLAN integrated network, guard channel, performance analysis, call admission control, Markov decision process., level-dependent QBD.

Mathematics Subject Classification: Primary: 90B18, 90B2.

Citation: Jae Man Park, Gang Uk Hwang, Boo Geum Jung. Design and analysis of an adaptive guard channel based CAC scheme in a 3G-WLAN integrated network. Journal of Industrial & Management Optimization, 2010, 6 (3) : 621-639. doi: 10.3934/jimo.2010.6.621

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