Fatema Shaikh

Exploring Efficient Imperative Handover Mechanisms for Heterogeneous Wireless Networks

The Next Generation Internet will provide ubiquitous computing by the seamless operation of heterogeneous wireless networks. It will also provide support for quality-ofservice, QoS, fostering new classes of applications and will have a built-in multi-level security environment. A key requirement of this new infrastructure will be support for efficient vertical handover. Y-Comm is a new architecture that will meet the challenge of this new environment. This paper explores the design of efficient imperative handover mechanisms using the Y-Comm Framework. It first looks at different types of handovers, then examines the Y-Comm Framework and shows how Y-Comm maps unto current mobile infrastructure. It then explores support for different handover mechanisms using Y-Comm. Finally, it highlights the development of a new testbed to further investigate the proposed mechanisms.

Proactive Policy Management using TBVH Mechanism in Heterogeneous Networks

In order to achieve seamless interoperability in heterogeneous networking, it is vital to improve the context-awareness of the mobile node (MN) so that it is able to predict future network conditions with sufficient accuracy. In this paper, we introduce a predictive mathematical model for calculating the estimated Time Before Vertical Handover (TBVH) component from available network parameters. The model is practically implemented in OPNET and our simulation results confirm the validity of the concept. We then demonstrate how the knowledge of TBVH along with other network parameters can be applied by downward Quality of Service management policies which bundle multi-class traffic streams on to available network channels based on application QoS, device mobility patterns and prevailing channel conditions.

Client-based SBM Layer for Predictive Management of Traffic Flows in Heterogeneous Networks

In a heterogeneous networking environment, the knowledge of the time before a vertical handover (TBVH) for any network is vital in correctly assigning connections to available channels. In this paper, we introduce a predictive mathematical model for calculating the estimated TBVH component from available network parameters and discuss the different scenarios that arise based on a mobile hosts trajectory. We then introduce the concept of an intelligent stream bundle management layer (SBM) which consists of a set of policies for scheduling and mapping prioritised traffic streams on to available channels based on their priority, device mobility pattern and prevailing channel conditions. The layer is also responsible for the maintenance of connections during vertical handovers to avoid their forced termination

Proactive Policy Management for Heterogeneous Networks

Context-awareness is a vital requirement of heterogeneous devices which allows them to predict future network conditions with sufficient accuracy. In this paper we present a proactive modelling-based approach for policy management which allows the mobile node to calculate Time Before Vertical Handover for open and closed environments. The paper explains how the knowledge of this component can improve the manner in which multi-class traffic streams are allocated to available network channels. Simulation results confirm the feasibility of the concept.

Critical analysis of high speed wireless standards for transferring telementoring information

Summary form only given. The main focus of this paper is to investigate the requirements for developing a feasible solution for the transmission of Telesurgical (mainly Telementoring) audio and video information over high speed wireless links. This requires an improvement in the quality of service of the wireless link between two sites in terms of throughput, delay, delay variations, stability and security. As the high level features of current broadband wireless technologies can be employed to provide the high-speed link between the two sites, this paper also critically analyses and evaluates the functionality issues of current and upcoming wireless standards such as Spectrum Management, Media Access Technologies, and Authentication Access and Control. It also investigates their suitability for the transmission of Telesurgical information. It then classifies the wireless technologies into different categories based on their ability to transfer information over long and short distances. The analysis carried out in this paper would lay out the guidelines for selecting an appropriate wireless standard for transferring Telesurgical information.