Abstract
As a transport layer protocol SCTP uses end to end metrics, such as Retransmission Time Out (RTO), to manage mobility handover. Our investigation illustrates that Wireless LAN (WLAN) mobility causes continuously increased Round Trip Times (RTT) resulting from 802.11 MAC retransmissions, regardless of the service specified by upper layers. We present scenarios where the current understanding of SCTP switchover aggressiveness is invalid; spurious failovers together with excessive RTO result in new forms of receiver buffer blocking communication failure. Given wireless mobility performance issues, together with the ambiguity of end to end metrics, we propose an Adaptive Optimized RTO algorithm for wireless Access Networks (AORAN) which uses local as well as end to end metrics to manage mobility. AORAN measures RTT between the mobile node and Access Point (AP) to calculate wireless and Internet RTO subcomponents. We also show binary exponential backoff has negative effects on SCTP with increased wireless RTT; AORAN introduces a decision mechanism which implements backoff on RTO subcomponents only when appropriate.
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References
Stewart, R., Xie, Q., et al.: Stream Control Transmission Protocol, RFC 4960 (September 2007)
Stewart, R., Xie, Q., et al.: Stream Control Transmission Protocol, Dynamic Address Reconfiguration, proposed extension (May 2006)
Riegel, M., Tuexen, M.: Mobile SCTP, proposed draft (March 2006)
Fallon, S., Jacob, P., Qiao, Y., Murphy, L.: SCTP Switchover Performance Issues in WLAN Environments. In: 5th IEEE Consumer Communications and Networking Conference (CCNC), January 2008, vol. (10-12), pp. 564–568 (2008)
Fallon, S., Jacob, P., Qiao, Y., Murphy, L.: An Analysis of Alterations to the SCTP RTO Calculation Mechanism for WLAN Environments. In: MWCN 2008 Wireless and Mobile Networking. IFIP, vol. 284, pp. 95–108 (2008)
Wireless LAN Medium Access Control and Physical Layer Specifications (March 2007)
Caro, A., Amer, P., Stewart, R.: Rethinking End-to-End Failover with Transport Layer Multihoming. Annals of Telecommunications - Transport Protocols for NGNs 61 (January-February 2006)
Wireless Multi-path Transmission Using SCTP draft-zhang-wcmt-sctp-00 (September 2008)
Dedu, E., Linck, S., Spies, F.: Removing the MAC Retransmissions Times from the RTT in TCP. In: Euromedia Conference 2005 (2005)
Ratnam, K., Matta, I.: Effect of local retransmission at wireless access points on the round trip time estimation of TCP. In: 31st Annual Simulation Symposium 1998 (1998)
Moller, N., Johansson, K.H., Hjalmarsson, H.: Making retransmission delays in wireless links friendlier to TCP. In: 43rd IEEE Conference on Decision and Control (CDC), vol. 5(14-17), pp. 5134–5139 (December 2004)
Malone, D.W., Clifford, P., Leith, D.J.: On Buffer Sizing for Voice in 802.11 WLANs. IEEE Communications Letters 10(10), 701–703 (2006)
Caro Jr., A.L., Amer, P.D., Stewart, R.R.: End-to-end failover thresholds for transport layer multihoming. In: MILCOM 2004, vol. 1, pp. 99–105. IEEE, Los Alamitos (2004)
Fitzpatrick, J., Murphy, S., Murphy, J.: An Approach to Transport Layer Handover of VoIP over WLAN. In: 3rd IEEE Consumer Communications and Networking Conference (CCNC), vol. 2, pp. 1093–1097 (2006)
Caro, A., Amer, P., Stewart, R.: Retransmission Schemes for End- to-end Failover with Transport Layer Multihoming. In: GLOBECOMM 2004 (2004)
Iyengar, J., Amer, P., Stewart, R.: Receive buffer blocking in concurrent multipath transfer. In: Globecom 2005, vol. 3, pp. 1341–1347 (2005)
Qiao, Y., Fallon, E., Murphy, J., Murphy, L.: SCTP performance issue on path delay differential. In: Boavida, F., Monteiro, E., Mascolo, S., Koucheryavy, Y. (eds.) WWIC 2007. LNCS, vol. 4517, pp. 43–54. Springer, Heidelberg (2007)
Natarajan, P., Shah, K., Amer, P.: Concurrent Multipath Transfer using SCTP Multihoming: Introducing the Potentially-failed Destination State. In: IFIP Networking 2008 (2008)
SCTP library (sctplib), version sctplib-1.0.5, http://www.sctp.de
802.11 WLAN Hands-on Analysis - Unleashing the Network Monitor for troubleshooting and Optimization. Byron W Putman
Combs, G., et al.: Wireshark network protocol Analyzer, Version 0.99.5
AirPcap 802.11 Wireless Packet Capture CACE Technologies
UC Berkeley, LBL, USC/ISI, and Xerox Parc: ns-2 Version 2.29 (October 2005)
Caro, A., et al.: ns-2 SCTP module, Version 3.5
Floyd, S.: TCP and Explicit Congestion Notification. ACM Computer Communication Review 24 (1994)
Kuzmanovic, A.: The Power of Explicit Congestion Notification. ACM SIGCOMM Computer Communication Review 35(4) (2005)
Ladha, S., et al.: draft-ladha-sctp-nonce-06 (January 2007)
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Fallon, S., Jacob, P., Qiao, Y., Murphy, L. (2009). An Adaptive Optimized RTO Algorithm for Multi-homed Wireless Environments. In: van den Berg, H., Heijenk, G., Osipov, E., Staehle, D. (eds) Wired/Wireless Internet Communications. WWIC 2009. Lecture Notes in Computer Science, vol 5546. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-02118-3_12
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DOI: https://doi.org/10.1007/978-3-642-02118-3_12
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