Analytical and stochastic modeling techniques and by Khalid Al-Begain, Dieter Fiems, Gábor Horváth

By Khalid Al-Begain, Dieter Fiems, Gábor Horváth

This e-book constitutes the refereed lawsuits of the sixteenth foreign convention on Analytical and Stochastic Modeling ideas and purposes, ASMTA 2009, held in Madrid, Spain, in June 2009 together with ECMS 2009, the 23nd eu convention on Modeling and Simulation.

The 27 revised complete papers awarded have been conscientiously reviewed and chosen from fifty five submissions. The papers are prepared in topical sections on telecommunication networks; instant & cellular networks; simulation; quueing platforms & distributions; queueing & scheduling in telecommunication networks; version checking & technique algebra; functionality & reliability research of assorted systems.

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Additional resources for Analytical and stochastic modeling techniques and applications 16th international conference, ASMTA 2009, Madrid, Spain, June 9-12, 2009: proceedings

Example text

E. less than 20% of source locations are observed in Germany for downloads of English content [28]. The assignment of peers to the same supernode in the eDonkey network may also generate locality within the reach of a supernode, but which does not correspond to national or ISP boundaries. Traffic locality also has been investigated for data exchange between regions within an ISP platform by Cho et al. [10] using measurement from several Japanese service providers. Based on IP address analysis, they found user-to-user traffic to be dominant, which may correspond to P2P or other applications running between users.

A study of transfer paths in Akamai´s CDN [30] shows how users are redirected from the original web site by the underlying CDN to a close-by server within a hierarchical server farm consisting of thousands of servers. The connection is dynamically switched to another server if performance measurement and load conditions indicate better quality of service for the new path. Su et al. [30] confirm that CDNs are efficient in shortening transmission paths and improving delays and throughput as main quality of service characteristics.

State (i + 1, j, k). This case can be reached, if either one of the two following events happens: – a PU arrives and occupies a free channel which is not occupied by an SU with probability c1 −(i+j) c1 −i . Therefore, the ongoing SU transmission will not be affected. – a PU arrives and occupies a channel which is utilized by an SU with jα probability c1i,j,k −i , whereas the indicator variable αi,j,k = 1, if i + j < c1 , k = c2 and 0 otherwise. Therefore, the PU preempts the SU from this channel.

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