Consideration of SCTP selective retransmission under the endpoints time non-synchronization

By exploiting Stream Control transmission Protocol (SCTP), we proposed a selective retransmission scheme to improve the performance of MPEG-4 streaming traffic. The scheme selects retransmissions of lost packets that can reach at the receiver side with the scheduled time. The selection of lost packets to be retransmitted is based on the one-way delay that can be obtained by assuming the time synchronization between two endpoints. However, the time synchronization cannot be expected in general. The purpose of this paper is to investigate the performance of the selective retransmission scheme without assuming the time synchronization. By computer simulations, we examine the effects of the offset of synchronization (the time difference between two endpoints) on the performance. Using several MPEG-4 stream data, we investigate the relationship between the selective retransmission and the time difference, and discuss the applicability of the scheme.