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Advances in Multimedia
Volume 2007, Article ID 95474, 7 pages
Research Article

Efficient TTI for 3G Multimedia Applications

Areos 28, Athens 13121, Greece

Received 24 April 2007; Accepted 23 July 2007

Academic Editor: Stavros Kotsopoulos

Copyright © 2007 Costas Chaikalis. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Time transmission interval (TTI) or outer block interleaving is an important task for the implementation of UMTS turbo coding in flat Rayleigh fading environment. An efficient TTI choice can save computational complexity. However, different multimedia scenarios are investigated using the maximum UMTS frame length, and simulation results are presented for the four possible outer block interleaver configurations in the case of flat Rayleigh fading channel. It is shown that different operating environments require an appropriate TTI in terms of bit error rate (BER) performance for the following data rates: 28.8 kbps, 64 kbps, 144 kbps, 384 kbps, and 2 Mbps.