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Performance Evaluation of Structured P2P over Wireless Multi-hop Networks
Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. (DISCO)
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2008 (English)In: SENSORCOMM '08 Proceedings of the 2008 Second International Conference on Sensor Technologies and Applications, IEEE conference proceedings, 2008, p. 796-801Conference paper, Published paper (Refereed)
Abstract [en]

Internet connected wireless multi-hop networks are an interesting alternative for providing broadband wireless access. In order for the network to be transparent, the same services need to be available as in standard infrastructure wireless deployments. However, there is a significant challenge in providing services such as authentication, name resolution, VoIP over multi-hop mesh networks as dedicated servers implementing those services might be not available. Therefore, deploying overlay networks in the mesh to decentralize those services and move towards a Peer-to-Peer paradigm is an interesting approach. However, the multi-hop nature of wireless mesh networks and the restrictions in resource availability might cause problems when deploying overlay networks on top of such environments. In this paper, we investigate the overhead and trade-offs when deploying a structured overlay solution such as the Bamboo DHT over wireless multi-hop mesh networks. We provide various simulation results characterizing the overhead of management and control traffic and give recommendations for performance improvement.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2008. p. 796-801
National Category
Computer Sciences
Research subject
Computer Science
Identifiers
URN: urn:nbn:se:kau:diva-3972DOI: 10.1109/SENSORCOMM.2008.15ISBN: 978-0-7695-3330-8 (print)OAI: oai:DiVA.org:kau-3972DiVA, id: diva2:211291
Conference
Int. Conf. on Advances in Mesh Networks (MESH 2008), Cap Esterel, France, August, 2008
Available from: 2009-05-26 Created: 2009-04-14 Last updated: 2018-01-13Bibliographically approved
In thesis
1. Enabling Multimedia Services over Wireless Multi-Hop Networks
Open this publication in new window or tab >>Enabling Multimedia Services over Wireless Multi-Hop Networks
2009 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

With the constant development of wireless technologies, the usageof wireless devices tends to increase even more in the future.Wireless multi-hop networks (WMNs) have emerged as a keytechnology to numerous potential scenarios, ranging from disasterrecovery to wireless broadband internet access. The distributedarchitecture of WMNs enables nodes to cooperatively relay othernode's packets. Because of their advantages over other wirelessnetworks, WMNs are undergoing rapid progress and inspiringnumerous applications. However, many technical issues still existin this field. In this thesis we investigate how Voice over IP(VoIP) and peer-to-peer (P2P) application are influenced bywireless multi-hop network characteristics and how to optimizethem in order to provide scalable communication.We first consider the deployment of VoIP service in wirelessmulti-hop networks, by using the Session Initiation Protocol (SIP)architecture. Our investigation shows that the centralized SIParchitecture imposes several challenges when deployed in thedecentralized wireless multi-hop environment. We find that VoIPquality metrics are severely degraded as the traffic and number ofmultiple hops to the gateway increase. In the context ofscalability, we further propose four alternative approaches whichavoid current limitations.In the second part of this thesis we tackle the network capacityproblem while providing scalable VoIP service over wirelessmulti-hop networks. The performance evaluation shows the influenceof intra and inter-flow interference in channel utilization, whichdirect impacts the VoIP capacity. In order to avoid the small VoIPpacket overhead, we propose a new adaptive hop-by-hop packetaggregation scheme based on wireless link characteristics. Ourperformance evaluation shows that the proposed scheme can increasethe VoIP capacity by a two-fold gain.The study of peer-to-peer applicability over wireless multi-hopnetworks is another important contribution. A resource lookupapplication is realized through structured P2P overlay. We showthat due to several reasons, such as characteristics of wirelesslinks, multi-hop forwarding operation, and structured P2Pmanagement traffic aggressiveness the performance of traditionalP2P applications is rather low in wireless multi-hop environments.Therefore, we suggested that a trade-off between the P2P lookupefficiency and the P2P management traffic overhead can be achievedwhile maintaining the overlay network consistency in wirelessmulti-hop networks.

Place, publisher, year, edition, pages
Karlstad: Karlstad University, 2009. p. 98
Series
Karlstad University Studies, ISSN 1403-8099 ; 2009:24
Keywords
Wireless Multi-hop Networks, Mobile Ad-hoc Networks, Wireless Mesh Networks, Voice over IP, Session Initiation Protocol, Peer-to-Peer Overlay Networks
National Category
Computer Sciences
Research subject
Computer Science
Identifiers
urn:nbn:se:kau:diva-3980 (URN)978-91-7063-247-1 (ISBN)
Presentation
2009-06-01, Karlstad University, 00:00 (English)
Opponent
Supervisors
Available from: 2009-05-26 Created: 2009-04-14 Last updated: 2018-01-13Bibliographically approved

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Castro, MarcelKassler, Andreas

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