Conference Papers

Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/28506

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Subject: search.filters.subject.Delay Tolerant Network

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    Human mobility based message transfer in Delay Tolerant Networks A single relay approach
    (2011) D'Souza, R.J.; Jose, J.
    A Delay Tolerant Network (DTN) is a type of Mobile Ad Hoc Network, where end-to-end connectivity between a pair of nodes may never exist. Due to this lack of end-to-end connectivity, traditional routing methods are not suitable in a DTN. However, various approaches have been proposed to achieve message transfer in such a network. This work looks into utilizing the capacity of 802.11n wireless standard, available on the modern mobile devices for this task. Modern mobile devices are equipped with multiple wireless ports as well as ever increasing processing power and storage capacity. They are not utilized as an alternative means for message transfer, even when the infrastructure-based connectivity is not available. The mobile devices move around according to the human mobility pattern, which is semi-deterministic in nature. This work studies how this semi-deterministic nature of human mobility can be effectively utilized for message transfer in a DTN environment. Simulation shows that the existing features of mobile devices are sufficient to achieve close to 100% connection opportunities. © 2011 IEEE.
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    A novel solution to routing in Cognitive Radio ad-hoc networks in high primary user traffic environments
    (Institute of Electrical and Electronics Engineers Inc., 2015) Sridhar, A.; Sridhar, S.; Lal, S.
    Cognitive Radio technology holds great promise in solving the problem of spectrum scarcity. A plethora of routing protocols exist for Cognitive Radio networks, however most of them relay on establishing an end-to-end path using a Common Control Channel. This paper focuses on scenarios where the Primary User traffic is very high and erratic and therefore trying to set up end-to-end paths is not feasible. A novel solution to this problem is proposed where the cognitive users form a Cognitive Delay Tolerant Network through a modification in the network stack. Well researched delay tolerant networking routing protocols designed for networks with unreliable links, configured for multiple channel can used for routing in high primary user traffic environments. Through extensive simulation we show the that proposed architecture provides very high delivery ratio (close to 1) in the presence of very high primary user traffic with negligible computational complexity and the absence of a common control channel. We also show that trying to rely on routing protocols that try to establish end to end paths such as Multi-Channel AODV is not feasible. The performance of Multi-Channel AODV and proposed architecture is compared and analyzed with bundle/packet delivery ratio, end-to-end delay and hop count as performance metrics. © 2015 IEEE.