Theses and Dissertations

Permanent URI for this collectionhttp://ir.daiict.ac.in/handle/123456789/1

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    Two-level pricing scheme for congestion control and service differentiation in the Internet
    (Dhirubhai Ambani Institute of Information and Communication Technology, 2006) Kulkarni, Vineet; Srivastava, Sanjay; Lenin, R.B
    It is the property of any good service provider that, if a user is ready to pay for the services he demands, the provider will ensure that the requested level of service is made available. Is this possible in the Internet? The answer is No. This is because there is no uniform economic model based on which service is provided in the Internet. Through pricing, we provide one such model which is sensitive to user demands and budgets. The proposed pricing mechanism performs the dual functions of providing service differentiation according to budgets, and doing congestion control through feedback at time scale comparable to a round trip time. We investigate the optimal rate allocation and stability issues of the proposed scheme. A two level pricing scheme is proposed to reflect the structure of the Internet. Data statistics are maintained as an aggregate, thus reducing the load on intermediate routers in the Internet. The scheme has been proposed so as to require minimal changes to the current Internet. The working of the pricing scheme in different traffic scenarios is demonstrated through simulations.
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    Weblab: a framework for remote laboratories
    (Dhirubhai Ambani Institute of Information and Communication Technology, 2005) Agrawal, Awkash; Srivastava, Sanjay
    Remote laboratories have been proposed and implemented in the past to address a number of issues, namely wider access to high-end expensive experiments, safety, and better resource utilization. However, the existing projects are designed for specific knowledge domains, and normally run in a dedicated access mode. There is a pressing need to share the limited laboratory resources of the academic institutions in India among the universities. Studies have suggested that most of the Indian universities have basic computing and Internet facility. In this work we propose a web-based 3-tier architecture (WebLab) that provides shared batch mode access to the experiments over low-bandwidth network to maximize the laboratory utilization. A generic experiment is modeled as a set of inputs, outputs, and constraints. A lab/experiment registration toolkit is designed to capture the metadata for the labs and experiments. This allows for a rapid and standardized integration of the experiments with the WebLab. A proof of concept lab is implemented on this architecture.
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    Performance analysis of diffserv multicast (DSMCast) for heterogeneous receivers
    (Dhirubhai Ambani Institute of Information and Communication Technology, 2004) Bhatt, Amee; Jotwani, Naresh D.
    Internet is a large infrastructure that provides means for global communication. One of the biggest challenges faced in its growth and maintenance is the provision for the best Quality of Service (QoS) to the end-user applications. There exist some mechanisms that have evolved to achieve QoS in IP networks and amongst them Differentiated Services (DiffServ) is a prevalent one. With the increased usage of multimedia applications such as video and audio conferencing, which primarily use multicast mode of communication, one obvious question that arises is whether suitable QoS in terms of resource assurance and service differentiation can be guaranteed to them. This thesis answers the question affirmatively and discusses a recently proposed approach: DSMCast, which attempts to offer QoS for multicast applications in DiffServ domain. The main objective of the thesis is to analyze how DSMCast provides support for heterogeneous QoS receivers participating in a multicast session. The performance analysis of DSMCast indicates that it can support the heterogeneous QoS requirements for the multicast receivers in a better way than traditional IP multicast. The simulation results bring out an important implication due to the nearness of receivers who have low QoS demands to those who have high QoS demands.