Abstract
SCTP (Stream control transmission protocol) is a new transport layer protocol that was published as RFC2960 by IETF (the Internet Engineering Task Force) in October 2000 and amended in RFC4960 in September 2007. SCTP provides reliable ordered and unordered transport services. The congestion control and flow control mechanisms for SCTP are very similar to those for TCP (transmission control protocol). SCTP can apply more than one IP address when establishing associations. SCTP multihoming can support multiple paths in association. These features provide SCTP with some network-level fault tolerance through network address redundancy. SCTP multihoming has tremendous transmission potential. However, SCTP path management is very simple in RFC4960 and therefore cannot effectively distinguish path conditions; it also has no path switch strategy appropriate for wireless networking. These factors all degrade SCTP performance. This study proposes a new path management (quality-aware SCTP) for wireless networks; this includes a new path failure detection method and ICE (idle path congestion window size estimation) mechanism. An experiment using NS2 was performed, showing that quality-aware SCTP can effectively improve the network performance. Quality-aware SCTP is simple and provides a more effective performance than SCTP alone.
Highlights
SCTP is a new transport layer protocol that was published as RFC2960/RFC4960 [1] by the IETF [2] in October 2000/September 2007
This study described how to identify the primary path condition and analyzed the defects of SCTP in path management for wireless networks to propose a new solution termed quality-aware SCTP, which is simple and improves the efficiency of the path selection mechanism
The original path management method for SCTP that is defined in RFC4960 is very simple but does not effectively distinguish path conditions or efficiently apply multiple destination addresses in wireless networks
Summary
SCTP is a new transport layer protocol that was published as RFC2960/RFC4960 [1] by the IETF [2] in October 2000/September 2007. The design was inspired by the PSTN (public switched telephone network). SCTP was originally designed to provide transport services for SS7 signaling messages over IP networks. SCTP, TCP, and UDP are transport layer protocols in IP (network layer) architecture. SCTP is a connectionoriented transport protocol similar to TCP. The congestion control and flow control mechanisms of SCTP are very similar to those of TCP, including slow start, congestion avoidance, and fast retransmission. Other significant features of SCTP include multihoming, multistream, SACK (selective acknowledgement), and reliable ordered/unordered transmission service
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