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Optimisation of End-to-End TCP Performance in A UMTS Network
KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT. (LCN/CCSlab)
2003 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Due to the FEC and ARQ mechanisms in UMTS the wireless part will not introduce loss, but instead introduces latency. This thesis aims to optimize the radio network (RAN) parameters in UMTS affecting TCP and then to optimize the parameters in TCP to perform better in this network.

The tests have been performed in a live 3G network. A traffic model has been implemented into a client/server allowing us to simulate a UMTS customer in the cell, with which we can test different parameter settings. Radio parameters controlling radio connection supervision, channel switching, and power control’s BLER-target have been examined. Performance has been measured in terms of throughput and cell capacity.

The results show that we can improve TCP performance by 25% with better static parameter settings. However, the system would be even better with a dynamic approach that would adjust the RAN parameter settings to better match the current load in the cell. In this way the performance/user can be increased significantly and as an example for one user the average throughput given a specific traffic pattern can be increased from 65 kbps up to 300 - 320 kbps.

Place, publisher, year, edition, pages
2003. , 78 p.
Trita-IMIT-LCN. AVH, ISSN 1651-4106 ; 2003-10
National Category
Communication Systems
URN: urn:nbn:se:kth:diva-99128OAI: diva2:541075
2003-11-24, Wireless@KTH, Isafjordsgatan 30B, Kista, 10:00 (English)
Available from: 2012-07-30 Created: 2012-07-13 Last updated: 2013-09-09Bibliographically approved

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Glifberg, Fredrik
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