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Transport Protocols for IP-traffic over DVB-T
KTH, Superseded Departments, Teleinformatics. (CCSlab)
1999 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The rapid growing demand for Internet connectivity has created a surge for new techniques that will enable people to connect from any place at any time. The wireless networks of today are limited in range or in bandwidth. In this thesis work DVB-T (Digital Video Broadcast - Terrestrial) has been studied in combination with GSM (Global System for Mobile communications), in order to evaluate how such a system can be used to provide a high bandwidth, long range, data link.

The commonly used Transmission Control Protocol (TCP) is known to perform very poorly with asymmetric and long delay links. Wireless links usually have bit errors, errors that corrupts packets, and often these bit errors come in bursts and thereby corrupting many packets. More than one lost packet will significantly degrade the TCP performance. In an asymmetric network the link with the smallest bandwidth will set the limit of throughput if any kind of data acknowledgments (Acks) are used. TCP is ACK driven and for large asymmetries the theoretical throughput will depend heavily on the packet-size and the bandwidth of the narrow link. The DVB-T/GSM system is both wireless and highly asymmetric, in raw bandwidth as well as in delay, which makes the use of standard TCP unworkable.

Many techniques has been studied in order to find a solution to how the transport protocol should be tuned to handle the characteristics of DVB-T and GSM. The solution presented in this work does not set any demands on the host on the Internet, and is fully compatible with existing standards. This system will enable speeds up to 13 times faster than conventional TCP.

Place, publisher, year, edition, pages
1999. , 44 p.
National Category
Communication Systems
URN: urn:nbn:se:kth:diva-95432OAI: diva2:528305
Subject / course
Educational program
Master of Science in Engineering - Electrical Engineering
1999-03-10, Seminar room "Telegrafen", Isafjordsgatan 22, Kista, 17:00 (Swedish)
Available from: 2012-06-15 Created: 2012-05-24 Last updated: 2013-09-09Bibliographically approved

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Haggård Ljungquist, Jonas
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