DYNAMICALLY ADAPTIVE BANDWIDTH ALLOCATION FOR HANDOFF MULTIMEDIA SERVICES FOR QUALITY OF SERVICE PERFORMANCE IN MOBILE CELLULAR NETWORKS

Abstract

With the tremendous growth of multimedia services in the telecommunication industry, Quality of Service (QoS) provisioning is becoming more important. One of the challenges to achieve QoS requirements is to determine how to allocate system bandwidth to various applications. Moreover, bandwidth being a scarce resource, it should be used efficiently. One way of achieving this is to adopt micro/pico/femto-cellular architectures. A consequence of using small cell sizes is the increased rate of call handoffs as mobile terminals move between cells. In a network supporting multimedia services, the increased rate of call handoffs not only increases the signaling load on the network, but also adversely affects the QoS. To reduce handoff failures and achieve high bandwidth utilization an efficient multi- class adaptive bandwidth-allocation strategy that reclaims bandwidth from on-going calls is designed. Since a mathematical analysis of a real network is difficult, proper simulations are preferred. The focus for this paper is simulation of cellular network functionality on NS-2 integrated with EURANE. In this simulation, different scenarios have been designed for different classes of traffic and the performance is measured using parameters such as throughput and packet loss. To analyze the result of the simulation, the traffic is traced during the process. For every packet, information about it is written to a specified trace file.Primarily two scenarios are created. One is adaptive bandwidth allocation and another is non-adaptive bandwidth allocation. Different sets of results from the two scenarios give us the opportunity to investigate the performance of these schemes. The investigation illustrates that proper adaptation of bandwidth meets the QoS Requirements.