Institute for Systems Research Technical Reports

Permanent URI for this collectionhttp://hdl.handle.net/1903/4376

This archive contains a collection of reports generated by the faculty and students of the Institute for Systems Research (ISR), a permanent, interdisciplinary research unit in the A. James Clark School of Engineering at the University of Maryland. ISR-based projects are conducted through partnerships with industry and government, bringing together faculty and students from multiple academic departments and colleges across the university.

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Author: search.filters.author.Roy-Choudhary, Ayan

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    Studying Real-time Traffic in Multi-hop Networks Using the EMANE Emulator: Capabilities and Limitations
    (2011) Jain, Kaustubh; Roy-Choudhary, Ayan; Somasundaram, Kiran K.; Wang, Baobing; Baras, John S.
    In this paper, we study the fidelity of an open-source software emulator to provide reliable estimation of performance for real-time traffic in mobile ad-hoc networks. We emulate the IEEE 802.11 MAC/PHY (DCF) using the EMANE software emulator deployed on a cluster and run experiments for different multi-hop wireless scenarios with the Optimized Link State Routing (OLSR) protocol. As an instance of real-world usage scenario, we study the performance of real-time streaming media over a mesh network supported by OLSR. In particular, we study the effect of mobility and background traffic on carried load, delay and jitter. As another application, we analyze the impact of the wireless network on the self-similarity of aggregate traffic. Using traffic source models with high variability, we show that the aggregate traffic in the wireless network is self-similar and hence preserves its burstiness at larger time scales. The results are consistent with those obtained from high-fidelity simulation within some limitations of the emulator.
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    INORA- A Unified Signaling cum Routing Mechanism for QoS Support in Mobile Adhoc Networks
    (2002) Dharmaraju, Dinesh; Hovareshti, Pedram; Roy-Choudhary, Ayan; Baras, John; Corson, Scott; ISR; CSHCN
    Mobile Adhoc Networks are characterized by bandwidth constrained wireless links, multiple hops and highly dynamic topologies. Thus, providing QoS support in MANETs is a challenging task. This paper presents the design, implementation and evaluation of a network layer QoS support mechanism which makes use of the INSIGNIA inband signaling mechanism and TORA routing protocol for MANETs. TORA provides multiple routes between a given source and destination. We present an effective coupling between TORA and INSIGNIA to get routes that are "best-able" to provide QoS requirements for a flow. INORA also combines congestion control with routing.