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Network Controlled Mobility Management with Policy Enforcement towards IMT-A
Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
Aalborg University, Denmark.
Nokia Siemens Networks, München, Germany.
Telefonica R&D, Madrid, Spain.
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2008 (English)In: International Conference on Communications, Circuits and Systems, 2008. ICCCAS 2008, Xiamen, China: IEEE conference proceedings, 2008, 139-143 p.Conference paper (Refereed)
Abstract [en]

This paper introduces a framework of mobility management and call-handling based on policy enhancement towards the IMT-Advanced systems. The function allocation and several selected mechanisms for the framework are described. The framework is based on the EU IST WINNER research project results and enables scalable service provisioning by setting the end user satisfaction and overall system performance as general goals. This paper aims to serve as a reference for the design of IMT-Advanced systems.

Place, publisher, year, edition, pages
Xiamen, China: IEEE conference proceedings, 2008. 139-143 p.
National Category
Computer Science
Research subject
Computer Science
Identifiers
URN: urn:nbn:se:kau:diva-21762ISBN: 978-1-4244-2064-3ISBN: 978-1-4244-2063-6OAI: oai:DiVA.org:kau-21762DiVA: diva2:595436
Conference
ICCCAS 2008
Projects
WINNER (Wireless World Initiative New Radio)
Available from: 2013-01-21 Created: 2013-01-21 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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