A BANDWIDTH ALLOCATION FRAMEWORK USING TIME ADAPTABILITY FOR MULTIMEDIA TRAFFIC IN WIRELESS AND MOBILE CELLULAR NETWORKS
Next generation wireless and mobile cellular networks are expected to support multimedia applications. High user mobility and inherent instability of wireless channels make quality of service (QoS) provisioning a challenging issue in wireless and mobile networks. In this thesis, we propose a novel concept of time adaptability and introduce two adaptive time bandwidth allocation schemes, namely, adaptive time period (ATP) and flexible adaptive time period (FATP) for QoS provisioning in wireless and mobile cellular networks for variable bandwidth multimedia calls. With time adaptability, each call not only specifies the minimum and maximum bandwidth requirements in terms of basic bandwidth units (bbu), but also specifies a step size and an adaptive period. Step size is the bbu constituting each layer of adaptive multimedia. Adaptive period is the time period specified by a call over which the bandwidth change incurred by the call cannot exceed the step size for that call. This, accompanied by temporary bandwidth borrowing from the ongoing calls not only reduces forced termination probability of handoff calls and ensures that each call gets a fare share of the available system bandwidth but also helps to decrease large bandwidth fluctuations at the end mobile users running multimedia applications such as video conferencing or online gaming. Extensive simulation results show that our proposed schemes maintain a low forced termination probability for handoff calls and significantly reduce bandwidth variations.
School:University of Cincinnati
School Location:USA - Ohio
Source Type:Master's Thesis
Keywords:bandwidth allocation qos adaptive multimedia time adaptability call admission control
Date of Publication:01/01/2005