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Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Effective Radio Resource Management for Multimedia Broadcast/Multicast Services in UMTS Networks | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2006 Article ID 70903 Pages 1-12 DOI 10.1155 WCN 2006 70903 Effective Radio Resource Management for Multimedia Broadcast Multicast Services in UMTS Networks Nuno Souto 1 2 Armando Soares 2 Patricia Eusebio 2 Americo Correia 1 2 and Joao C. Silva1 1 Instituto de Telecomunicaẹões Avenue Rovisco Pais 1 1049-001 Lisboa Portugal 2 Associaẹão para o Desenvolvimento das Telecomunicacões e Técnicas de Informatica Avenue das Forcas Armadas Edificio ISCTE 1600-082 Lisboa Portugal Received 29 September 2005 Revised 3 February 2006 Accepted 26 May 2006 Broadcast and multicast offer a significant improvement of spectrum utilization and become particularly important where information channels are shared among several users. Mobile cellular environments are expected to evolve with the technological approaches necessary to facilitate the deployment of multimedia services such as streaming file download and carousel services. The perspective that video streaming in wireless networks services is an attractive service to end-users has spurred the research in this area. To provide for a video delivery platform in UMTS the third generation partnership project 3GPP addressed this problem with the introduction of the multimedia broadcast and multicast services MBMS in 3GPP Release 6. In this document we analyse several effective radio resource management techniques to provide MBMS namely use of nonuniform QAM constellations multicode and macrodiversity to guarantee the optimal distribution of QoS depending on the location of mobiles. Copyright 2006 Nuno Souto et al. 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. 1. INTRODUCTION In a mobile cellular network it is often necessary to transmit the same information to all the users .
