Change search
ReferencesLink to record
Permanent link

Direct link
Utility as a User Selection Criterion for Coordinated Multi-Point Systems
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science.
Universitat de València. (IRTIC)
Uppsala University. (Signals and Systems)
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science.
Show others and affiliations
2013 (English)In: 2013 IEEE 24th International Symposium on Personal Indoor and Mobile Radio Communications (PIMRC), London: IEEE conference proceedings, 2013, 3123-3128 p.Conference paper (Refereed)
Abstract [en]

Coordinated multipoint (CoMP) transmission and reception techniques have been proposed to combat inter-cell interference in cellular systems and, hence, to increase the data rates. Due to the overhead introduced, not all users may be served with CoMP. In this paper, we focus on how to select users for joint processing CoMP under limited backhaul capacity. The evaluated user selection schemes take user experience into account, quantified by the utility of Internet application types. We propose a heuristic algorithm utility based user selection that has low computational complexity. Utility based user selection and maximize utility, which maximizes the sum utilities, are compared to maximize rate, which maximizes the sum data rates. A range of traffic mixes and user locations are evaluated. The simulation results indicate that resources required for CoMP are more efficiently used if the user selection is based on utility rather than on maximizing the total data rate. If utility is taken into account a higher total utility can in many cases be achieved for the same limited backhaul capacity.

Place, publisher, year, edition, pages
London: IEEE conference proceedings, 2013. 3123-3128 p.
National Category
Engineering and Technology
Research subject
Computer Science
Identifiers
URN: urn:nbn:se:kau:diva-30031DOI: 10.1109/PIMRC.2013.6666683ISI: 000346481203038OAI: oai:DiVA.org:kau-30031DiVA: diva2:664508
Conference
2013 IEEE 24th International Symposium on Personal, Indoor and Mobile Radio Communications(PIMRC): Mobile and Wireless Networks
Available from: 2013-11-15 Created: 2013-11-15 Last updated: 2015-11-19Bibliographically 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

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Klockar, AnnikaBrunstrom, Anna
By organisation
Department of Mathematics and Computer Science
Engineering and Technology

Search outside of DiVA

GoogleGoogle Scholar

Altmetric score

Total: 62 hits
ReferencesLink to record
Permanent link

Direct link