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Utility of Joint Processing Schemes
Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
Signals and Systems, Chalmers University of Technology, Gothenburg.
Signals and Systems, Chalmers University of Technology, Gothenburg.
Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
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2010 (English)In: 2010 7th International Symposium on Wireless Communication Systems (ISWCS 2010), IEEE Communications Society, 2010, 76-80 p.Conference paper, (Refereed)
Abstract [en]

Joint processing between base stations has been shown as an efficient technique to mitigate inter-cell interference and increase data rates, in particular at the cell edges. In this paper, we evaluate the utility of Internet applications in a joint processing enabled cluster of base stations. Utility is used to quantify system performance as experienced by the end user. In particular, the utility of three joint processing schemes for the downlink is characterized and compared within the cluster area. The qualitative results indicate that joint processing can significantly improve the utility of hard real-time and adaptive applications. For elastic applications, joint processing is not worthwhile, since almost as high utility is achieved also with conventional single base station assignment

Place, publisher, year, edition, pages
IEEE Communications Society, 2010. 76-80 p.
National Category
Computer Science
Research subject
Computer Science
Identifiers
URN: urn:nbn:se:kau:diva-10098DOI: 10.1109/ISWCS.2010.5624280ISBN: 978-1-4244-6315-2 (print)OAI: oai:DiVA.org:kau-10098DiVA: diva2:493618
Conference
The Seventh International Symposium on Wireless Communication Systems (ISWCS)
Available from: 2012-02-08 Created: 2012-02-08 Last updated: 2015-04-13Bibliographically approved
In thesis
1. Improving User Experience of Internet Services in Cellular Networks
Open this publication in new window or tab >>Improving User Experience of Internet Services in Cellular Networks
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Alternative title[en]
Improving User Experience of Internet Services in Cellular Networks
Abstract [en]

The Internet has grown enormously since the introduction of the World Wide Web in the early 90's. The evolution and wide spread deployment of cellular networks have contributed to make the Internet accessible to more people in more places. The cellular networks of today offer data rates high enough for most Internet services. Even so, the service quality experienced by the users is often lower than in wired networks.

The performance of TCP has a large impact on user experience. Therefore, we investigate TCP in cellular networks and propose functionality to improve the situation for TCP. We have studied sources of delay and data loss, such as link layer retransmissions, queuing, and handover. Measurements were conducted in a GSM/GPRS testbed. The results indicate that TCP interact efficiently with the GSM link layer protocol in most cases. From experiments of queuing in GPRS, we conclude that with a smaller buffer delay is reduced significantly, but that TCP throughput is about the same as with a larger buffer. Furthermore, we propose an improved buffer management when a connection loses all its resources to traffic with higher priority. We also propose a scheme for data forwarding to avoid negative impact on TCP during handover for WINNER, a research system that was used to test ideas for LTE.

The achievable data rates in cellular networks are limited by inter-cell interference that vary over the cell. Inter-cell interference can be mitigated with Coordinated Multipoint techniques (CoMP), techniques that currently are being standardized for LTE-Advanced. System wide CoMP is, however, not an option, since it would be too resource consuming. In order to limit the required resources for CoMP, we propose an approach to select a subset of users for CoMP that is based on user experience. Simulation results indicate that user experience, represented with application utility,  and fairness are improved compared to if only rate is considered in the user selection.

Abstract [en]

The Internet has grown enormously since the introduction of the World Wide Web in the early 90's. The evolution and wide spread deployment of cellular networks have contributed to make the Internet accessible to more people in more places. The cellular networks of today offer data rates high enough for most Internet services. Even so, the service quality experienced by the users is often lower than in wired networks.

The performance of TCP has a large impact on user experience. Therefore, we investigate TCP in cellular networks and propose functionality to improve the situation for TCP. We have studied sources of delay and data loss, such as link layer retransmissions, queuing, and handover.

The achievable data rates in cellular networks are limited by inter-cell interference that vary over the cell area. Inter-cell interference can be mitigated with Coordinated Multipoint techniques (CoMP), techniques that currently are being standardized for LTE-Advanced. System wide CoMP is, however, not an option, since it would be too resource consuming. In order to limit the required resources for CoMP, we propose an approach to select a subset of the users for CoMP that is based on user experience.

Place, publisher, year, edition, pages
Karlstad: Karlstads universitet, 2015. 33 p.
Series
Karlstad University Studies, ISSN 1403-8099 ; 2015:18
Keyword
Internet, cellular networks, wireless, TCP, ARQ, handover, queuing, CoMP, application utility, user selection, scheduling, fairness
National Category
Computer Science
Research subject
Computer Science
Identifiers
urn:nbn:se:kau:diva-35334 (URN)978-91-7063-631-8 (ISBN)
Public defence
2015-05-04, Rejmersalen, 9C 204, Karlstad, 13:15 (English)
Opponent
Supervisors
Available from: 2015-04-13 Created: 2015-03-06 Last updated: 2015-04-20Bibliographically approved

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