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Survey

Survey. S. J. Koh, et al., “ mSCTP for Soft Handover in Transport Layer ”, IEEE Comm. LETTERS , Vol. 8, No. 3, Mar 2004 (Korea) I . Aydin , et al., “ Cellular SCTP: A Transport-Layer Approach to Internet Mobility ”, IEEE ICCCN 2003 , 2003 (U of Delaware & KISTI, USA & Korea)

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Survey

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  1. Survey • S. J. Koh, et al., “mSCTP for Soft Handover in Transport Layer”, IEEE Comm. LETTERS, Vol. 8, No. 3, Mar 2004 (Korea) • I. Aydin, et al., “Cellular SCTP: A Transport-Layer Approach to Internet Mobility”, IEEE ICCCN 2003 , 2003 (U of Delaware & KISTI, USA & Korea) • Hung-Yun Hsieh, et al., “An End-to-End Approach for Transparent Mobility across Heterogeneous Wireless Networks”, Mobile Networks and Applications, No. 9, pp. 363–378, 2004 (GIT, USA) • A. Peddemors, et al., “A Mechanism for Host Mobility Management supporting Application Awareness”, ACM MobiSys’04. (Netherlands)

  2. mSCTP for Soft Handover in Transport Layer IEEE Comm. LETTERS, Mar 2004 also in draft-sjkoh-mobile-sctp-mobileip-04.txt, (expired)

  3. Introduction • ADDIP extension for SCTP. • It enables an SCTP endpoint to add a new IP address or delete an unnecessary IP address, and also to change the primary IP address used for the association, while an SCTP association is active. • "Steam control tramission protocal (SCTP) dynamic address reconfiguration", draft-ietf- tsvwg-addip-sctp-09.txt. June 2004 (expired)

  4. Step • Obtaining an IP address for a new location • Adding the new IP address to the SCTP association • Changing the primary IP address • Deleting the old IP address from the SCTP association

  5. Issue • The performance of mSCTP handover will depend on how to configure the triggering rules for “adding a new IP address” (Add-IP) and “changing the primary IP address” (Primary-Change) to an on-going SCTP association. Q1 to mg: How fast can MIP get a new CoA for seamless handoff ? Solution or Your idea ? Q2 to mg: Your rules ?

  6. Simulation Under NS2

  7. Rule for Add-IP • Aggressive Add-IP: A new IP address is added to the association only if the associated wireless signal strength is greater than the Add-IP criteria (i.e., 3.6 X10 ^-10 ). • Conservative Add-IP: A new IP address is added to the association if its wireless signal strength is greater than that those for the current IP addresses.

  8. Rule for Primary-Change • Aggressive (or higher) threshold for triggering “Primary-Change” = 6.8 X 10 ^-10 • Conservative (or lower) threshold for triggering “Primary-Change” = 4.7 X 10^-10

  9. Mobility Patterns

  10. Result

  11. Result (cont.)

  12. Consulsion • The mSCTP can be used to provide seamless handover for mobile sessions, without any support of network routers. The mSCTP performance seems to depend on the rules for triggering to add and change IP addresses to on-going associations during the handover. • The aggressive Add-IP rules and the conservative Primary-Change rules are recommended for improving the mSCTP data transport efficiency.

  13. Cellular SCTP: A Transport-Layer Approach to Internet Mobility

  14. Idea • Same idea with mSCTP, but CN duplicates and sends packets to both of the primary addresses to avoid slow start. • Use SIP to get MN’s new address.

  15. Step • Detecting and obtaining a new IP address • Adding the new IP address into the association • Data Transfer During Handover (duplicate packet) • Deleting old IP address from the association

  16. A Mechanism for Host Mobility Management supporting Application Awareness

  17. Architecture

  18. Component • Interface detection (ID) • For supplying information about the creation and deletion of network interfaces in the OS • Access Network Detection (AND) • For supplying information about available networks for wlan interfaces by scanning at regular intervals.

  19. Component (cont.) • Access Network Selection (ANS) • Get IP address from MIP • Supply credentials for authentication and authorization. • Indicates the preferred link layer connections Again…. Q3 to mg: Your cost function for choosing a good link.

  20. Applications

  21. An End-to-End Approach for Transparent Mobility across Heterogeneous Wireless Networks

  22. I only look the drawback of mSCTP into this paper.

  23. Problem of Mobile SCTP • Mobile SCTP does not support in-sequence data delivery (across multiple streams) as TCP. • Mobile SCTP does not allow multiple congestion control schemes to be used for different wireless interfaces. • Mobile SCTP does not support bandwidth aggregation.

  24. Reading List Congestion Control • A. Gurtov and R. Ludwig ,“Lifetime Packet Discard for Efficient Real-Time Transport over Cellular Links”, ACM M2CR, Vol. 7, No. 4, 2003 (Finland & Germany) Arch. • P. D. Neumiller, et al., “Open Base StationTransport (OBAST) Architecture”, ACM MC2R, Vol. 4, No. 3, 2000 (Industry) Active Network in ….. • P. Patel, et al., “Upgrading Transport Protocols using Untrusted Mobile Code”, ACM SOSP 03. (U. of Utah and U. of Washington, USA , ANTS team)

  25. IETF-draft Now • Mobile SCTP: draft-riegel-tuexen-mobile-sctp-04, Oct. 04 • Address Management for Mobile SCTP Handover: draft-chang-mobile-sctp-address-mgt-01, Oct. 04 • SCTP Sockets API Extension for Congestion Handling: draft-vibansal-sctpsocket-congestion-00, Dec. 04

  26. IETF-draft Now (cont.) • Sockets API Extensions for Stream Control Transmission Protocol (SCTP): draft-ietf-tsvwg-sctpsocket-09, Sept. 04 • Error and Congestion Control Algorithm for mSCTP handover: draft-chang-mobile-sctp-cc-00.txt , Oct. 04

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