In mobile SCTP, a mobile terminal has two or more network interfaces and vertical handover occurs when it moves from one\nnetwork to another.The delay due to the handover process and the slow-start phase of SCTP�s congestion control after handover\ncause substantial performance degradation. If the mobile node goes back and forth frequently, excessive handovers occur and\ndata transmission quality deteriorates. In order to provide the required level of QoS for on-going application, the frequency of\nhandovers should be kept minimized. In this paper, we propose a transport layer handover mechanism using the mobile SCTP.We\ntake the QoS requirements of application as the major criterion in deciding path switching. In our mechanism, the mobile node in\noverlapping area does not perform handover if the current network metrics satisfy the QoS requirements of on-going application.\nBoth analytic evaluation and simulation results show that the proposed mechanism significantly improves the throughput by\nsuppressing unnecessary handovers. Our research results can also be applied to distributed mobile sensor networks.
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