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In this paper we present a methodology for a performance aware design of communication systems including protocols and devices. The goal is to evaluate the performance already in early stages of the design process to avoid costly re-designs of bottlenecks in finished products. From protocol specifications given as sequence diagrams, we derive multiclass queueing networks as a means to estimate the performance of the system architecture before any executable prototype exists. This makes queueing theory accessible to system and protocol designers even if the designer is not familiar with details of queueing network theory. The methodology supports an easy evaluation of design alternatives without affecting the functional model. To achieve this, it incorporates the performance information into the system model in a non-invasive fashion, such that the system model remains meaningful without this information.

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In this experience report, we present experiences we have gained in applying performance engineering techniques during the design of a DVB-H enabled handheld device. The modelling methodology we applied uses UML 2.0 to model the system following a strict separation of architectural and behavioural aspects of the systems. From sequence diagrams and composite structure diagrams, a queueing network is generated for the analysis of the system performance. The configuration of the hardware resources and the resource demands is done using the standard SPT-profile. We describe our implementation and its seamless integration into a UML 2.0 CASE tool. Finally, the paper outlines lessons learnt during the design process which may be used to enhance the methodology.

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