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Emulation and Validation of a 4G System Proposal
Karlstad University, Division for Information Technology. Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. (Distributed Systems and Communication Research Group)ORCID iD: 0000-0003-0368-9221
Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Division for Information Technology. (Distributed Systems and Communication Research Group)ORCID iD: 0000-0001-7311-9334
Signaler och System, Uppsala universitet.
2005 (English)In: Proceedings of RadioVetenskap och Kommunikation 2005: Volume II, 2005, p. 357-362Conference paper, Published paper (Refereed)
Abstract [en]

This paper presents a wireless link and network emulator,along with experiments and validation against the "Wireless IP" 4G system proposal from Uppsala University and partners. In wireless fading downlinks (base to terminals) link-level frames are scheduled and the transmission is adapted on a fast time scale. With fast link adaptation and fast link level retransmission, the fading properties of wireless links can to a large extent be counteracted at thephysical and link layers. The emulator has been used to experimentally investigate the resulting interaction between the transport layer and the link layer. The paper gives an overview of the emulator design, and presents experimental results with three different TCP variants in combination with various link layer characteristics.

Place, publisher, year, edition, pages
2005. p. 357-362
Keywords [en]
network emulation, wireless, TCP, IP, 4G
National Category
Computer Systems
Research subject
Computer Science
Identifiers
URN: urn:nbn:se:kau:diva-2339ISBN: 91-7056-122-2 (print)OAI: oai:DiVA.org:kau-2339DiVA, id: diva2:24678
Conference
RVK05 RadioVetenskap och Kommunikation 2005, Linköping
Projects
Wireless IPAvailable from: 2009-06-05 Created: 2009-06-05 Last updated: 2018-06-04Bibliographically approved
In thesis
1. TCP in Wireless Networks: Challenges, Optimizations and Evaluations
Open this publication in new window or tab >>TCP in Wireless Networks: Challenges, Optimizations and Evaluations
2005 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis presents research on transport layer behavior in wireless networks. As the Internet is expanding its reach to include mobile devices, it has become apparent that some of the original design assumptions for the dominant transport protocol, TCP, are approaching their limits. A key feature of TCP is the congestion control algorithm, constructed with the assumption that packet loss is normally very low, and that packet loss therefore is a sign of network congestion. This holds true for wired networks, but for mobile wireless networks non-congestion related packet loss may appear. The varying signal power inherent with mobility and handover between base-stations are two example causes of such packet loss. This thesis provides an overview of the challenges for TCP in wireless networks together with a compilation of a number of suggested TCP optimizations for these environments. A TCP modification called TCP-L is proposed. It allows an application to increase its performance, in environments where residual bit errors normally give a degraded throughput, by making a reliability tradeoff. The performance of TCP-L is experimentally evaluated with an implementation in the Linux kernel. The transport layer performance in a 4G scenario is also experimentally investigated, focusing on the impact of the link layer design and its parameterization. Further, for emulation-based protocol evaluations, controlled packet loss and bit error generation is shown to be an important aspect.

Place, publisher, year, edition, pages
Karlstad: Karlstads universitet, 2005
Series
Karlstad University Studies, ISSN 1403-8099 ; 2005:13
Keywords
Wireless networks, TCP/IP, TCP-L, Network emulation
National Category
Computer Systems
Research subject
Computer Science
Identifiers
urn:nbn:se:kau:diva-2335 (URN)91-85335-53-3 (ISBN)
Presentation
2005-05-18, Agardsalen, 11D 257, Karlstads universitetKarlstad, 13:15 (English)
Opponent
Supervisors
Available from: 2009-06-05 Created: 2009-04-08 Last updated: 2016-10-25Bibliographically approved

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Alfredsson, StefanBrunstrom, Anna

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