By Pramode K. Verma, Ling Wang
This ebook addresses 3 very important concerns in VoIP networks: caliber of carrier, pricing and security.
In addressing caliber of carrier (QoS), it introduces the thought of hold up now not exceeding an top restrict, termed the bounded hold up, to degree the standard of carrier in VoIP networks. Queuing types are brought to degree functionality when it comes to bounded delays. Closed shape suggestions touching on the influence 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 implications 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. a similar concept and research also are utilized on jitter, one other very important indicator of the VoIP QoS
This ebook additionally develops a pricing version in accordance with the standard of carrier supplied in VoIP networks. It offers the influence of caliber of VoIP carrier demanded by means of the client at the transmission assets required via the community utilizing an analytical process. moreover, it extends and applies the hold up throughput research built for VoIP networks in assessing the influence of hazards constituted through a couple of transportation channels, the place the danger linked to each one channel will be quantified via a recognized distribution. eventually, the booklet explores parts for destiny study that may be outfitted at the beginning of analysis presented.
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Extra info for Voice over IP networks : quality of service, pricing and security
The time intervals between generated packets are random and independent since they follow Poisson distribution. Since the probability of generating n packets in time interval t is given by Pn ðtÞ ¼ eÀkt ðktÞn : n! ð5:16Þ Therefore, we can find the time interval for the next generated packet as , 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.
7 presents the conclusion of our work. 2 Network Model Most analyses involving packet-switched systems assume that packets are negative exponentially distributed . We assume a constant length for the size of each message. Accordingly, our model of the multi-hop network is based on M/D/1queues. An M/M/1 system is characterized by two parameters, the average packet arrival rate k and the average service time 1/l. An equivalent M/D/1 system would have a constant service time of 1/l and an arrival rate of k.
This is the approach adopted in this book. In the mathematical model used in this book, we assume an infinite buffer at each node. Packets are thus not lost, but delayed. As mentioned earlier, we use delay to characterize the Quality of Service. While contemporary literature largely uses mean delay to characterize the QoS, we propose to use an upper bound of the delay as a measure of the same. Traffic that suffers a delay higher than the bound is considered lost and does not constitute effective throughput .
Voice over IP networks : quality of service, pricing and security by Pramode K. Verma, Ling Wang