Electrical - Electronic Engineering / Elektrik - Elektronik Mühendisliği

Permanent URI for this collectionhttps://hdl.handle.net/11147/11

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Institution Author: search.filters.institutionAuthor.Aydoğdu, CananSubject: search.filters.subject.Goodput

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  • Conference Object
    Effect of Traffic Arrival Distributions on Routing Strategy in Multi-Hop Wireless Networks
    (Association for Computing Machinery (ACM), 2016) Aydoğdu, Canan
    The basic problem of whether direct transmission or multi- hop routing increases goodput in multi-hop wireless net- works still lacks investigation from many aspects. This ar- ticle, approaches this problem by considering the effect of different traffic arrival distributions on the choice of rout- ing strategy for enhancing goodput of IEEE 802.11 DCF based multi-hop wireless networks under hidden terminal existence. Different traffic arrival distributions including Poisson, constant bit rate (CBR), Pareto and Exponential are considered, relaxing the generally adopted Poisson as- sumption, for various data rates over a wide range of traffic loads extending from unsaturated to saturated traffic loads. The goodput performance for all traffic arrival distribu- tions is found to be dependent on the traffic load in multi- hop networks. Of the four traffic models used, the network achieved the best goodput with Pareto and Exponential ar- rival distributions for light traffic loads, where CBR per- forms slightly better under heavy loads. The results suggest that a traffic load-aware pre-control mechanism on the traffic arrivals to the IEEE 802.11 MAC layer might provide signicant goodput gains in multi-hop wireless networks.
  • Article
    Citation - WoS: 6
    Citation - Scopus: 9
    Goodput and Throughput Comparison of Single-Hop and Multi-Hop Routing for Ieee 802.11 Dcf-Based Wireless Networks Under Hidden Terminal Existence
    (John Wiley and Sons Inc., 2016) Aydoğdu, Canan; Karaşan, Ezhan
    We investigate how multi-hop routing affects the goodput and throughput performances of IEEE 802.11 distributed coordination function-based wireless networks compared with direct transmission (single hopping), when medium access control dynamics such as carrier sensing, collisions, retransmissions, and exponential backoff are taken into account under hidden terminal presence. We propose a semi-Markov chain-based goodput and throughput model for IEEE 802.11-based wireless networks, which works accurately with both multi-hopping and single hopping for different network topologies and over a large range of traffic loads. Results show that, under light traffic, there is little benefit of parallel transmissions and both single-hop and multi-hop routing achieve the same end-to-end goodput. Under moderate traffic, concurrent transmissions are favorable as multi-hopping improves the goodput up to 730% with respect to single hopping for dense networks. At heavy traffic, multi-hopping becomes unstable because of increased packet collisions and network congestion, and single-hopping achieves higher network layer goodput compared with multi-hop routing. As for the link layer throughput is concerned, multi-hopping increases throughput 75 times for large networks, whereas single hopping may become advantageous for small networks. The results point out that the end-to-end goodput can be improved by adaptively switching between single hopping and multi-hopping according to the traffic load and topology.