Packet Reordering has been shown to be an ever-increasing phenomenon on the Internet and must be taken into account when considering performance analysis of both fixed, wireless and mixed media networks. Previous work [1] has demonstrated that TCP suffers degraded performance in situations of high packet reordering. This paper will consider why video traffic over UDP also performs badly in situations of high packet reordering, due to the temporal inter-packet dependencies introduced by the MPEG video encoding structure. Wireless networks are especially prone to problems due to the higher levels of link layer retransmissions found in noisy wireless environments. An experimental investigation into the effects of video packet reordering using the Windows Media streaming system is presented. A method for invoking packet reordering is introduced, and a tool for client-side measurements of video quality is presented. Typical measurements of video performance undergoing reordering are shown, with a study of buffering occupancy at the client, and the potential impact this could have on video packet reordering demonstrated
Abstract-The work presented in this paper is targeted at the first phase of the test and measurements product life cycle, namely standardisation. During this initial phase of any product, the emphasis is on the development of standards that support new technologies while leaving the scope of implementations as open as possible. To allow the engineer to freely create and invent tools that can quickly help him simulate or emulate his ideas are paramount. Within this scope, a traffic generation system has been developed for IEC 61850
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