Analytical modeling of primary and secondary load as induced by video applications using UDP/IP
Computer Communications
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A particular challenge, when trying to analyse and predict the behaviour of subnetworks of the global Internet, refers to the task of elaborating a sufficiently realistic workload characterization, e.g., by means of workload modeling. In particular, it is necessary to specify (work)load at different system interfaces. This report presents a generalized proceeding for load modeling including a set of formal methods for load specification. At first the basic proceeding is applied by way of example to the modeling of primary load, i.e. load at an interface close to end-users, whereby we focus on video sources. We then tackle the challenging problem of characterizing secondary load, i.e. load as it is occuring at a lower layer interface within a protocol/service hierarchy, and for this purpose we suggest a new approach for analytical modeling of load transformations as they are typical for communication networks. Modeling load transformations again is exemplified by means of a comprehensive case study assuming video sources and considering some load transformation corresponding to the impact which a UDP/IP protocol hierarchy would have on some offered primary load. A set of detailed measurements proves that our approach to model load transformations can indeed be used to prognosticate a highly valid characterization of secondary load in case of Internet or Intranet configurations.