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TCP Performance in Wireless Mobile Multi-hop Ad Hoc Networks
KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT. (CCSlab)
2003 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

There are many issues that limit the performance of wireless mobile multi-hop ad hoc networks (MANETs). One of them is that TCP is not well adapted to networks where routes can change or disappear often. In this paper the behaviour of a standard TCP implementation is studied in situations typical for MANETs and compared to the behaviour of a partial implementation of a ATCP, a TCP modification that is intended to increase performance in MANETs.

Simulations with simple scenarios show that TCP easily creates a full network load which causes send failures and decreased throughput performance. In some cases the partial ATCP implementation increases throughput but more often it causes an increased amount of duplicate retransmissions. In these scenarios it is unlikely that even a complete ATCP implementation would increase throughput performance.

A few modifications to ATCP and TCP are analysed. Especially a limit of the congestion window size shows a large throughput increase. The results are inconclusive, the simulations are too simple to show if the results are applicable in more complex scenarios. It is not clear if ATCP actually is useful in a MANET.

Abstract [sv]

Många faktorer begränsar prestandan i trådlösa mobila multi-hopp ad hoc-nätverk (MANET:er). En av dem är att TCP inte är anpassat till nätverk där rutter ofta kan förändras eller försvinna. I den här rapporten studeras hur en vanlig TCP-implementation uppför sig i typiska MANET-situationer. Detta beteende jämförs mot en partiell implementation av ATCP, en TCPmodifiering som är tänkt att öka prestanda i MANET:er.

Simuleringar med enkla scenarier visar att TCP lätt genererar en full nätverkslast vilket orsakar misslyckade sändningar och en minskad genomströmningsprestanda. I vissa fall ökar den partiella ATCP-implementationen genomströmningen, men oftare ger den en ökad mängd onödiga omsändningar. I dessa scenarier är det inte troligt att ens en komplett ATCP-implementation skulle öka genomströmningsprestanda.

Några mindre förändringar av ATCP och TCP analyseras. Särskilt ger en begränsning av stockningsfönstret en stor ökning av genomströmningen. Resultaten är ofullständiga. Simuleringarna är för enkla för att kunna visa om om resultaten är tillämpliga i mer komplexa scenarier. Det är inte klarlagt ifall ATCP verkligen är användbart i ett MANET.

Place, publisher, year, edition, pages
2003. , 47 p.
Series
TRITA-IMIT-LCN. AVH, ISSN 1651-4106 ; 2003-11
Keyword [en]
mobile multi-hop ad hoc networks, ATCP
National Category
Communication Systems
Identifiers
URN: urn:nbn:se:kth:diva-93070OAI: oai:DiVA.org:kth-93070DiVA: diva2:514752
Subject / course
Telecommunication Systems
Educational program
Master of Science in Engineering - Computer Science and Technology
Presentation
2003-11-24, Wireless@KTH, Isafjordsgatan 30B, Kista, 11:00 (English)
Uppsok
Technology
Supervisors
Examiners
Available from: 2012-04-13 Created: 2012-04-10 Last updated: 2017-02-06Bibliographically approved

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