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Emulation and Validation of a 4G System Proposal
Karlstads universitet, Institutionen för informationsteknologi. Karlstads universitet, Fakulteten för ekonomi, kommunikation och IT, Avdelningen för datavetenskap. (Distributed Systems and Communication Research Group)ORCID-id: 0000-0003-0368-9221
Karlstads universitet, Fakulteten för ekonomi, kommunikation och IT, Avdelningen för datavetenskap. Karlstads universitet, Institutionen för informationsteknologi. (Distributed Systems and Communication Research Group)ORCID-id: 0000-0001-7311-9334
Signaler och System, Uppsala universitet.
2005 (Engelska)Ingår i: Proceedings of RadioVetenskap och Kommunikation 2005: Volume II, 2005, s. 357-362Konferensbidrag, Publicerat paper (Refereegranskat)
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.

Ort, förlag, år, upplaga, sidor
2005. s. 357-362
Nyckelord [en]
network emulation, wireless, TCP, IP, 4G
Nationell ämneskategori
Datorsystem
Forskningsämne
Datavetenskap
Identifikatorer
URN: urn:nbn:se:kau:diva-2339ISBN: 91-7056-122-2 (tryckt)OAI: oai:DiVA.org:kau-2339DiVA, id: diva2:24678
Konferens
RVK05 RadioVetenskap och Kommunikation 2005, Linköping
Projekt
Wireless IPTillgänglig från: 2009-06-05 Skapad: 2009-06-05 Senast uppdaterad: 2018-06-04Bibliografiskt granskad
Ingår i avhandling
1. TCP in Wireless Networks: Challenges, Optimizations and Evaluations
Öppna denna publikation i ny flik eller fönster >>TCP in Wireless Networks: Challenges, Optimizations and Evaluations
2005 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Karlstad: Karlstads universitet, 2005
Serie
Karlstad University Studies, ISSN 1403-8099 ; 2005:13
Nyckelord
Wireless networks, TCP/IP, TCP-L, Network emulation
Nationell ämneskategori
Datorsystem
Forskningsämne
Datavetenskap
Identifikatorer
urn:nbn:se:kau:diva-2335 (URN)91-85335-53-3 (ISBN)
Presentation
2005-05-18, Agardsalen, 11D 257, Karlstads universitetKarlstad, 13:15 (Engelska)
Opponent
Handledare
Tillgänglig från: 2009-06-05 Skapad: 2009-04-08 Senast uppdaterad: 2016-10-25Bibliografiskt granskad

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Alfredsson, StefanBrunstrom, Anna

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