Quality of Service in Heterogeneous Networks : 6th International ICST Conference on Heterogeneous Networking for Quality, Reliability, Security and Robustness, QShine 2009 and 3rd International Workshop on Advanced Architectures and Algorithms for Internet Delivery and Applications, AAA-IDEA 2009 - Novella Bartolini, Sotiris Nikoletseas, Prasun Sinha, Valeria Cardellini, Anirban Mahanti ((Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering))