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Access Selection in Multi-Access Cellular and WLAN Networks
KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
2005 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

To meet the requirements of future data-rich applications and terminals with improved multimedia,  future wireless networks are expected to combine multiple access technologies.  When several radio access technologies are available, the assignment and the handover of  users among these technologies become fundamental problems. The solutions have a major  impact on the system performance as well as on the architecture of future networks. This  thesis focuses on access selection criteria in combined wide area coverage cellular and local  area coverage Wireless LAN networks. More specifically, involvement of traffic load information  on top of signal quality information during selection process is studied. A rough  but wide-ranging theory for what gains may be expected in different scenarios is first derived  through qualitative reasoning. Then, to verify the theory, a number of different signal  quality based and both signal quality and load based access selection algorithms are evaluated  in terms of achievable bitrate characteristics and system capacity via simulations. The  algorithms are compared for a set of different user behavior scenarios. Results indicate that  in scenarios with high traffic load concentrated to the hotspots or cellular access technologies  offering bitrates in the same order as WLANs, principles taking signal quality and traffic  load into account can provide gains around 20% both in capacity and in achievable bitrates.  In scenarios with more evenly distributed traffic or WLAN bitrates exceeding those of  cellular, smaller gains are achieved,

Place, publisher, year, edition, pages
2005. , 44 p.
Series
Trita-S3-RST, ISSN 1400-9137 ; 0501
National Category
Computer and Information Science
Identifiers
URN: urn:nbn:se:kth:diva-28074OAI: oai:DiVA.org:kth-28074DiVA: diva2:383920
Uppsok
Technology
Supervisors
Examiners
Available from: 2011-03-11 Created: 2011-01-06 Last updated: 2011-03-11Bibliographically approved

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http://www.ee.kth.se/php/modules/publications/reports/2005/1984.pdf

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