CC-SCTP: Chunk Checksum of SCTP for Enhancement of Throughput in Wireless Network Environments

Abstract

Stream Control Transmission Protocol (SCTP) uses the 32-bit checksum in the common header, by which a corrupted SCTP packet will be regarded as a lost packet and then discarded. This may result in degradation of throughput performance in wireless network environments. This paper proposes a new chunk checksum scheme for SCTP, called CC-SCTP, in which each data chunk contains its own checksum fields. The proposed chunk checksum scheme is introduced with the following three purposes: 1) to distinguish the chunk corruption from the chunk loss; 2) to avoid unnecessary halving the congestion window (cwnd) in the case of chunk corruption; 3) to avoid critical timeouts caused by chunk corruption. Simulation results using the ns-2 simulator show that the proposed CC-SCTP scheme could improve the SCTP throughput in the wireless network environments with a high bit error rate.