A Channel Preemption Model for Heterogeneous WLAN-embedded Cellular Networks
نویسنده
چکیده
This paper presents a channel preemption model for vertical handoff in heterogeneous WLAN (wireless LAN) embedded cellular networks. The novelty of this paper is right in that a newly initiated mobile node (MN) outside the WLAN coverage can preempt the channels occupied by an MN inside the WLAN coverage when the cellular channels are completely used up. The channel preempted MN is forced to switch its network access to WLAN. This proposed channel preemption scheme can effectively reduce the blocking probability while not disrupting any of the existing connections within WLANs. For the purpose of evaluation, we build a three-dimension Markov chains to analyze the proposed vertical handoff model. Network performance in terms of the number of active WLAN users, channel blocking probability of a cellular network, and preemption probability of an MN are calculated. From the analytical results, we demonstrate the performance superiority of the proposed scheme by varying the ratio of WLAN coverage. Key-Words: WLAN, cellular networks, blocking probability, vertical handoff, channel preemption, Markov chains
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