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Real-time services and multihop networks: Delay analysis of a multihop CDMA fixed relay network
KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT. (CCSlab)
2005 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The next generation of cellular networks is expected to carry high speed IP traffic in a packet switched environment in order to accommodate data traffic for a wide range of services. Much research is thus focused on how to increase the transmission rate in cellular networks. A general consequence of increasing transmission rate in a radio link is a corresponding increase in transmit power, resulting in increased interference and reduced network capacity. The straightforward way to reduce this effect is to shorten the link distance, which in the cellular case means shrinking the cells. This, however, means increased control traffic for handoffs and location registration, as well as increased infrastructure costs.

An alternative approach, which has received increased attention lately, is the introduction of wireless multihop access networks to relay traffic between the wired infrastructure and the users. Such an access network must clearly accommodate all types of services expected to operate in next generation systems, including real-time services. However, wireless multihop networks have traditionally had problems meeting the delay requirements posed by such services.

In this thesis, we will study the delay performance through analysis and simulation of such a network, based on the Virtual Cellular Network proposal [1], in which geographically fixed wireless relays are deployed to act as both network nodes and user relays.

Abstract [sv]

Nästa generations mobilnät förväntas bära paketväxlad höghastighetstraffik för att kunna stödja en stor mängd varierande tjänster. Mycket forskning har däför fokuserat på transmissionshastigheten i mobilnäten. En generell konsekvens av att öka transmissionshastigheten i ett radiobaserat nätverk är en motsvarande ökning i transmissionsstyrkan, vilket resulterar i ökad interferens och följaktligen minskad kapacitet. En lösning på det problemet är att minska avståndet mellan sändare och mottagare, vilket i fallet med dagens mobila infrastruktur innebär mindre, och fler celler. Detta skulle dock innebära både ökad kontrolltraffik och större kostnader för planering och underhåll av infrastruktur.

En alternativ väg, som den senaste tiden fått ökad uppmärksamhet, är införandet av ett trådlöst vidarebefordrande accessnätverk mellan de mobila stationerna och det fasta nätet. Ett sådant nätverk måste naturligtvis kunna ackommodera samtliga typer av tjänster som förväntas utnyttja nästa generations mobilnät, inklusive realtidstjänster. Dock har kraven på låg fördröjning hos denna typ av tjänster traditionellt inneburit problem problem för vidarebefordrande trådlösa nätverk.

I denna rapport studeras fördröjningskaraktären hos ett sådant nätverk, baserat på konceptet Virtual Cellular Network [1], i vilket geografiskt fixerade radionoder vidarebefordrar traffik mellan mobila stationer och det fasta nätet.

Place, publisher, year, edition, pages
2005. , 57 p.
Series
TRITA-IMIT-LCN. AVH, ISSN 1651-4106 ; 2005-21
Keyword [en]
multihop, wireless networks, real-time services, delay
National Category
Communication Systems
Identifiers
URN: urn:nbn:se:kth:diva-92264OAI: oai:DiVA.org:kth-92264DiVA: diva2:513059
Subject / course
Telecommunication Systems
Educational program
Master of Science in Engineering - Computer Science and Technology
Presentation
2005-09-16, Seminar room Grimeton, Isafjordsgatan 30B, Kista, 11:00
Uppsok
Technology
Supervisors
Examiners
Available from: 2012-04-02 Created: 2012-03-30 Last updated: 2017-02-06Bibliographically approved

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