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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: Research Article Cross-Layer Design of the Inter-RAT Handover between UMTS and WiMAX | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2010 Article ID 763614 13 pages doi 10.1155 2010 763614 Research Article Cross-Layer Design of the Inter-RAT Handover between UMTS and WìmAX Bin Liu 1 Philippe Martins 1 and Philippe Bertin2 1DepartementInformatique etReseaux Ecole Nationale Superieure des Telecommunications TELECOM ParisTech 46 rue Barrault 75013 Paris France 2 Orange Labs France Telecom R D 4 rue du Clos-Courtel 35512 Cesson Sevigne France Correspondence should be addressed to Bin Liu bliu@enst.fr Received 11 August 2010 Revised 2 November 2010 Accepted 29 December 2010 Academic Editor Farid Ahmed Copyright 2010 Bin Liu 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. In future mobile networks different radio access technologies will have to coexist. IEEE 802.21 MIH Media-Independent Handover provides primitive mechanisms that ease the implementation of a seamless vertical handover inter-RAT handover between different radio access technologies. However it does not specify any handover execution mechanism. The first objective of this paper is to propose a novel MIHF Media-Independent Handover Function variant which is renamed interworking IW sublayer. IW sublayer provides a seamless inter-RAT handover procedure between UMTS and WiMAX systems. It relies on a new intersystem retransmission mechanism with cross-layer interaction ability providing lossless handover while keeping acceptable delays. The second objective of this paper is to design a new TCP snoop agent TCP Snoop which interacts with the IW layer in order to mitigate BDP Bandwidth Delay Product mismatch and to solve spurious RTO Retransmission TimeOut problems. The cross-layer effects on the handover performance are evaluated by simulations. Our results show that cross-layer .
