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TCP and GSM Link Layer Interactions: Implications for the Wireless Internet
Karlstad University, Division for Information Technology.
Karlstad University, Division for Information Technology.
Karlstad University, Division for Information Technology.
Telia Mobile AB, Karlstad, Sweden.
2001 (English)In: IEEE VTS 53rd Vehicular Technology Conference, 2001, IEEE conference proceedings, 2001, 2198-2202 p.Conference paper (Refereed)
Abstract [en]

The demand for wireless access to the Internet has grown rapidly making the performance of TCP in wireless environments an important issue. We present experimental measurements of the performance of TCP over GSM. The measurements were captured over a real GSM network connected to a controlled radio environment. A range of radio conditions were considered with a focus on the interaction between TCP and the GSM link layer. Even for very poor radio conditions, only neglible negative interaction effects were found.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2001. 2198-2202 p.
National Category
Computer Science
Research subject
Computer Science
Identifiers
URN: urn:nbn:se:kau:diva-24150DOI: 10.1109/VETECS.2001.945086ISBN: 0-7803-6728-6OAI: oai:DiVA.org:kau-24150DiVA: diva2:597917
Conference
IEEE VTC Spring 2001, Rhodes, Greece, May, 2001
Available from: 2013-01-22 Created: 2013-01-22 Last updated: 2015-04-13Bibliographically approved
In thesis
1. A Measurement Based Performance Study of TCP over GSM/GPRS
Open this publication in new window or tab >>A Measurement Based Performance Study of TCP over GSM/GPRS
2004 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

In this thesis, the performance of the wireless Internet is studied with a focus on TCP over GSM/GPRS. To this end, we have developed a GSM/GPRS test bed for TCP measurements. We present measurements conducted in the test bed with TCP over both GSM and GPRS. The GSM measurements show that TCP interacts efficiently with the radio link layer in GSM, also under very poor radio conditions. The only cases when some inefficiency is detected occur due to sudden variations in delay. In GPRS, delay is, among other things, caused by buffering in intermediate nodes and by dynamic resource sharing. The GPRS measurements indicate that if the buffers in intermediate nodes are reduced, then the delay can be decreased significantly with almost retained throughput. Dynamic resource sharing is often configured to give preemptive priority to voice calls, which implies that all GPRS resources may be lost. Measurements with preemptive priority indicate that TCP performance is degraded more than necessary due to inefficient buffer management. The situation would improve if data was buffered during preemption and if the data was transmitted immediately as GPRS resources become available again

Place, publisher, year, edition, pages
Karlstad: Karlstads universitet, 2004
Series
Karlstad University Studies, ISSN 1403-8099 ; 2004:22
National Category
Computer Science
Research subject
Computer Science
Identifiers
urn:nbn:se:kau:diva-16578 (URN)9185019895 (ISBN)
Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2015-02-17Bibliographically approved
2. 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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Wennström (Klockar), AnnikaGarcia, JohanBrunström, Anna
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