Ash Mohammad Abbas received his Bachelor of Science in Computer Engineering in 1994 and Masters of Science in Communication and Information Systems in 1996 both from Aligarh Muslim University, India. He received his PhD from Department of Computer Science and Engineering, Indian Institute of Technology Delhi in 2006. He is a Reader at Department of Computer Engineering, AMU Aligarh. He is currently working as a Postdoc at Center for Quantifiable Quality of Service (Q2S), Center for Excellence, Norwegian University of Science and Technology (NTNU), Norway, under European Research Consortium on Informatics and Mathematics "Alain Bensousan" Postdoctoral Fellowship. His current research interests include ad hoc networks (routing, quality of service, etc).
Abstract: In case of an ad hoc network, due to dynamically varying topology, a routing protocol should be
aware of the lifetime of participating mobile devices. In this paper, we have proposed a routing protocol that
is based on the awareness of lifetimes of the participating nodes. Further, we analyze the impact of node
lifetime on multipath routing. In our analysis, we focus on the effects of the parameters such as number of
hops in the primary path, average hop difference between multiple node-disjoint paths and the probability of
survival of nodes.
Abstract: Correlation among queries is an important factor to
analyze as it may affect the results delivered by a search engine.
In this paper, we analyze correlation among queries and how
it affects the information retrieved from the Web. We analyze
two types of queries: (i) queries with embedded semantics, and
(ii) queries without any semantics. In our analysis, we consider
parameters such as search latencies and search relevance. We
focus on two major search portals that are mainly used by
end users. Further, we discuss a unified criteria for comparison
among the performance of the search engines.
Abstract: Providing quality of service in an ad hoc network is a challenging task. In this paper, we discuss a framework for user perceived quality of service in mobile ad hoc networks. In our framework, we try to aggregate the impact of various quality of service parameters. Our framework is flexible and has a provision of providing dynamic quality of service. Further, an application may adapt from the required quality of service to that which can readily be provided by the network under a stressful environment. Our framework may adapt to the QoS desired by a source based on user satisfaction.
Abstract: The design of an efficient and effective protocol for topology control in mobile ad hoc networks is a challenging task. In this paper, we present a brief review of protocols reported in the literature and propose a protocol for topology control in mobile ad hoc networks. Our protocol relys on leader election and density based clustering. A problem that may occur in cluster based topology control is usually known as alien-soldier-node problem. We discuss a framework for avoiding alein-soldier-node problem.
Abstract: Design of a disjoint multipath routing protocol in an ad hoc environment is a challenging task. In this paper, we propose a protocol named Vertex Disjoint Multipath Routing (VDMR) to discover multiple node disjoint paths between a given pair of nodes. A major issue in node disjoint multipath routing is path diminution. We propose schemes to mitigate path diminution. We analyse the probability of path diminution in a scheme commonly employed to discover node disjoint paths. We discuss how the probability of path diminution is reduced, using proposed schemes. We observe that VDMR with proposed schemes performs much better than existing multipath routing protocols in the sense that it has a low probability of diminution and high packet delivery ratio.
Abstract: An ad hoc network is a cooperative engagement of a collection of mobile nodes without the required intervention of any centralized access point or existing infrastructure. Developing efficient multi-path routing protocols in an ad hoc environment is a challenging task due to changing network connectivity. In this paper, we have designed a new routing protocol called Node Disjoint Multi-path Ad hoc Routing (NDMA), which gives multiple node disjoint paths between a given source and destination pair. We have analyzed the performance of our protocol by carrying out simulations and compared its performance with existing multi-path protocols such as AOMDV and MDSR. The metrics in our performance analysis are packet delivery ratio, normalized routing load and average end-to-end delay.
