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Nowadays, Internet congestion is indicated by dropping packets when the routers buffers are full, or by dropping packets according to an AQM mechanism such as RED. Many mechanisms have been proposed to eliminate or minimize the effect of packet loss and tackle the consequential inefficiency due the retransmission of the dropped packets. Fast congestion notification (FN), that has been evaluated through...
This paper defines network function and information flow to process the calls between Wibro and mobile phone, Wibro and wired phone which is resulted from number portability of Wibro VoIP by using NPSS. This paper also defines new number portability system, network function, information interface packet and system function according to the requirement of number portability.
Distributed denial of service (DDoS) attacks have become a major threat to organizations and especially to Internet and intranet. In DDoS attacks targets are overwhelmed by sending an enormous amount of traffic from a number of attack sites. The major tasks of any defense system are to detect these attacks accurately and early on, before it causes an unrecoverable loss. Most of the research in this...
As the next generation networks promise to provide network convergence with services for both static and mobile networks, the recent research focus is converging in the direction of standardizing common infrastructure based on all-IP networks. IMS is a recent initiative, designed by 3GPP and TISPAN partnership, which outlines a service delivery platform (SDP) framework. A flexible and robust QoS management...
The merit and demerit as well as the principle of RED algorithm are investigated. To overcome the difficulty in right parameters determination, an enhanced RED algorithm with adaptive parameters is proposed. The simulation results show that this enhanced RED algorithm can effectively reduce average queue length and packet loss. The algorithm has improved the adaptability of the RED algorithm.
Energy consumption in a computer system can be reduced by dynamic speed scaling, which adapts the processing speed to the current load. This paper studies the optimal way to adjust speed to balance mean response time and mean energy consumption, when jobs arrive as a Poisson process and processor sharing scheduling is used. Both bounds and asymptotics for the optimal speeds are provided. Interestingly,...
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