Partial-order transport service for multimedia and other applications
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This paper analytically studies retransmission-based partially reliable transport service. Results show that partially reliable transport service provides increasingly higher throughput and lower delay than reliable transport service as an application's loss tolerance increases and as the underlying network service gets more lossy. Also, to some degree, partially reliable transport service eases the negative effects of ack losses on throughport. Three cost functions associated with the reliability level that a system can support are introduced. These cost functions help demonstrate the penalty when a transport service does not support the ideal reliability level for an application. Results show that the use of reliable transport service when an applicataon only needs a partially reliable transport service can cause considerable throughput drops and delay increases in lossy networks. On the other hand, at high loss rates, unreliable transport service is unable to respect an application's loss tolerance. Thus, in lossy environments, partially reliable transport service is necessary to avoid the extra cost of reliable transport service, and, at the same time, to guarantee the minimal reliability that an application requires.