Performance Improvements of Mobile SCTP in Integrated Heterogeneous Wireless Networks

TitlePerformance Improvements of Mobile SCTP in Integrated Heterogeneous Wireless Networks
Publication TypeJournal Article
Year of Publication2007
AuthorsMa, L., F. R. Yu, and V. C. M. Leung
JournalWireless Communications, IEEE Transactions on
Pagination3567 -3577
Date Publishedoct.
Keywordscellular links, cellular radio, congestion avoidance process, error recovery scheme, integrated heterogeneous wireless networks, mobile SCTP, multicast communication, multicasting, radio links, round trip time, Sending-buffer Multicast-Aided Retransmission with Fast Retransmission, SMART-FRX, stream control transmission protocol, transport protocols, vertical handover, VHO, wireless LAN, wireless local area networks, WLAN

The complementary characteristics of cellular networks and wireless local area networks (WLANs) make it attractive to integrate these two technologies. In this integrated heterogeneous environment, mobile stream control transmission protocol (MSCTP) is ideal to support vertical handover (VHO) between them by enabling a mobile client to freely switch between IP addresses acquired in different networks. In this paper, we show that the MSCTP-based VHO scheme suffers from poor throughput performance during WLAN to cellular forced VHOs. We propose a novel error recovery scheme called Sending-buffer Multicast-Aided Retransmission with Fast Retransmission (SMART-FRX) to improve performance during VHO by multicasting the buffered and new data over both WLAN and cellular links when handover losses occur. In addition, we propose a new analytical model for SCTP that takes into account the congestion window, the round trip time, the slow-start and congestion avoidance processes. By comparing numerical results from the proposed analytical model with simulation results, we demonstrate that our analytical model is able to predict the SCTP throughput accurately, with or without the SMART-FRX scheme. The analytical model provides a useful tool that can be extended to study the performance of SCTP in other applications. Analytical and simulation results show that the proposed SMART-FRX scheme can improve the SCTP throughput performance significantly in WLAN to cellular forced VHO situations.


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