Voice over IP networks : quality of service, pricing and by Pramode K. Verma, Ling Wang

By Pramode K. Verma, Ling Wang

This booklet addresses 3 vital concerns in VoIP networks: caliber of carrier, pricing and security.

In addressing caliber of provider (QoS), it introduces the idea of hold up now not exceeding an top restrict, termed the bounded hold up, to degree the standard of provider in VoIP networks. Queuing versions are brought to degree functionality by way of bounded delays. Closed shape suggestions touching on the impression of bounding delays on throughput of VoIP site visitors are supplied. site visitors that exceeds the hold up threshold is taken care of as misplaced throughput. the consequences addressed can be utilized in scaling assets in a VoIP community for various thresholds of applicable delays. either unmarried and a number of switching issues are addressed. an identical concept and research also are utilized on jitter, one other vital indicator of the VoIP QoS

This e-book additionally develops a pricing version in line with the standard of provider supplied in VoIP networks. It offers the influence of caliber of VoIP carrier demanded by way of the buyer at the transmission assets required through the community utilizing an analytical strategy. moreover, it extends and applies the hold up throughput research built for VoIP networks in assessing the influence of dangers constituted by way of a few transportation channels, the place the danger linked to each one channel might be quantified through a recognized distribution. ultimately, the ebook explores parts for destiny learn that may be equipped at the origin of analysis presented.

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Our focus has been on computing throughput of a network if the traffic that suffered higher than a specified threshold delay did not constitute throughput. The results obtained will be useful in sizing up resources of the network to meet a specified maximum end-to-end delay criterion. 7 Conclusion 47 Fig. 8 Simulation of the delay distribution function of the two-hop Fig. 9 Simulation of the throughput in the two-hop network The results obtained can be used to compute the maximum traffic bearing capacity of the network.

2 that c1 is continuous on the closed interval [0, lC]. Thus, if cmax is an extreme value of c1 corresponding to k0 on that interval, then one of the following two statements is true: (a) c0 (k0) = 0, or (b) c0 (k0)does not exist. 2) is: dc1 k ¼ 1 À ð2 þ ktÞeÀðlCÀkÞt lC dk ð4:3Þ which exists. 2) is: ! 3 A Single-Hop VoIP Network 39 which is negative. We can now obtain the maximum throughput cmax by putting the first derivative of c1 equal to zero. 5) can be rewritten as, k0 ð2 þ k0 tÞ ¼ lCeðlCÀk0 Þt ð4:6Þ The corresponding maximum throughput cmax can be computed from Eqs.

5:16Þ Therefore, we can find the time interval for the next generated packet as [83], 1 t ¼ À logð1 À xÞ k ð5:17Þ where x is the uniformly distributed random number between 0 and 1. 17 is used in the simulation to calculate the next time interval between generated packets. As shown in the block diagram, at iteration k, the next time interval before generating a new packet is Tk. Then the program calculates the number of packets served at each node during Tk. The simulation logs the buffer status (number of packets in the buffer) along with the simulation time intervals.

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Voice over IP networks : quality of service, pricing and by Pramode K. Verma, Ling Wang
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