Novel Queueing Model for Multimedia Overdownlink in 3.5G Wireless Network

Abstract

In this paper, a model for multimedia transmission over downlink shared channel in 3.5G wireless network is presented. The multimedia stream consists of multiple substreams that are aggregated into one real-time and one nonreal-time ТАows. Correlation with each ТАow and between ТАows is assumed. Additionally, we propose a combined time-space priority buТЎer management scheme to optimise quality of service requirements for each ТАow. The problem is formulated in terms of a queue with two priority classes, one of which has time priority while the another has space priority. The input is described by the Batch Marked Markovian Arrival Process (BMMAP). Service time distributions are of PH (phase) type dependent on the class of a customer. The buТЎer is ТЏnite, but the customers of a class having higher priority for taking into the service from a buТЎer (time priority) can occupy only a part of this buТЎer. Queueing system s behavior is described in terms of multi-dimensional continuous time skip-free to the left Markov chain. It allows to exploit an eТЎective algorithm for calculation of the stationary distribution of the queueing system. Loss probability for customers of both classes is calculated. Waiting time distribution for priority customers is calculated.