T.-L. Sheu and Y.-J. Wu (Taiwan)
Channel allocation, handoff, mobile wireless networks, preemption, and Markov chains
This paper presents a channel allocation model with both partial and full preemptions (PFP) for multimedia traffic in mobile wireless networks. Multimedia traffic in our model basically consists of three classes, with each class possessing different bandwidth requirements and delay sensitivities. The first class has very stringent delay and bandwidth requirements. The second class has higher bandwidth requirements initially, and could be degraded if the mobile network becomes congested. The third class is non-real-time traffic, which can tolerate temporal call disconnection if the calls of the first two classes grow drastically and unexpectedly. For the purpose of performance evaluation, we analyze the PFP channel allocation model with 4-D Markov chains. The performance metrics of our interests include the dropping probability of handoff calls; the call-interruption probability due to full preemption; the bandwidth reduction ratio resulted from the effect of partial preemption; and the average channel utilization.
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