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User-centric pre-selection and scheduling for coordinated multipoint systems
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science.
Uppsala University. (Signals and Systems)
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science. (DISCO)
Uppsala University. (Signals and Systems)
2014 (English)In: 2014 11th International Symposium on Wireless Communications Systems (ISWCS 2014), IEEE Press, 2014, 888-894 p.Conference paper (Refereed)
Abstract [en]

The data traffic volumes are constantly increasing in cellular networks. Furthermore, a larger part of the traffic is generated by applications that require high data rates. Techniques including Coordinated Multipoint transmission (CoMP) can increase the data rates, but at the cost of a high overhead. The overhead can be reduced if only a subset of the users is served with CoMP. In this paper, we propose a user selection approach, including pre-selection of CoMP users and short term scheduling, that takes user requirements into account. Users that require a high data rate to reach an acceptable level of service satisfaction are selected to use coherent joint processing CoMP in some of their downlink transmission bandwidth. Simulation results show that both the number of satisfied users and fairness are improved with the proposed user selection as compared to user selection that does not consider individual user requirements.

Place, publisher, year, edition, pages
IEEE Press, 2014. 888-894 p.
Keyword [en]
CHALLENGES; NETWORKS
National Category
Communication Systems Computer Science
Research subject
Computer Science
Identifiers
URN: urn:nbn:se:kau:diva-35122DOI: 10.1109/ISWCS.2014.6933479ISI: 000363906500171ISBN: 978-1-4799-5863-4OAI: oai:DiVA.org:kau-35122DiVA: diva2:785535
Conference
11th International Symposium on Wireless Communications Systems (ISWCS), 2014, Barcelona, Spain
Available from: 2015-02-03 Created: 2015-02-03 Last updated: 2016-10-15Bibliographically 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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