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Recent collapses of SIP servers in the real carrier networks indicate that the built-in SIP overload control mechanism cannot mitigate overload effectively. In this paper, we investigate the root cause of SIP server crash by studying the impact of the retransmission on the queuing delay of the overloaded server. The transient overload may introduce the excessive queuing delay, thus triggering unnecessary...
As an explicit congestion control protocol, API-RCP (Adaptive PI rate control protocol) was originally proposed for best-effort traffic control in the IP networks with high bandwidth-delay product. The original API-RCP adopts a truncated network model for IP router in order to simplify the control system design while still achieving various designed performance measures at steady-state. A further...
TCP becomes inefficient and prone to instability when its bandwidth-delay product increases. By sending explicit congestion information from routers to end hosts, both XCP and API-RCP have been proposed to solve the stability issue of TCP in high bandwidth-delay product networks. Since the estimation errors of the network parameters are unavoidable, we would like to design a robust controller to address...
Theoretical analysis and experiments have shown that TCP can become oscillatory and prone to instability in high bandwidth-delay-product networks. XCP was proposed to overcome these shortcomings by advertising an explicit window adjustment from the routers to the sources. However, XCP may under-utilize the bandwidth in a multi-bottleneck network and cause some flows to receive an arbitrarily small...
TCP is widely implemented for congestion control in current IP networks. As the network bandwidth increases, TCP becomes oscillatory and prone to instability, regardless of the queuing scheme. As a rate-based control scheme, XCP was proposed to obtain high link utilization in high bandwidth-delay product networks, while maintaining small queue size in the routers. XCP explicit feedbacks the congestion...
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