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A NoC is composed by IP cores (Intellectual Propriety) and switches connectedamong themselves by communication channels. End-to-End Delay (EED)communication is accomplished by the exchange of data among IP cores. Often,the structure of particular messages is not adequate for the communicationpurposes. This leads to the concept of packet switching. In the context ofNoCs, packets are composed by header, payload, and trailer. Packets are dividedinto small pieces called Flits. It appears of importance, to meet the requiredperformance in NoC hardware resources. It should be specified in an earlierstep of the system design. The main attention should be given to the choice ofsome network parameters such as the physical buffer size in the node. The EEDand packet loss are some of the critical QoS metrics. Some real-time andmultimedia applications bound up these parameters and require specific hardwareresources and particular management approaches in the NoC switch. A trafficcontract (SLA, Service Level Agreement) specifies the ability of a network orprotocol to give guaranteed performance, throughput or latency bounds based onmutually agreed measures, usually by prioritizing traffic. A defined Quality ofService (QoS) may be required for some types of network real time traffic ormultimedia applications. The main goal of this paper is, using the Network onChip modeling architecture, to define a QoS metric. We focus on the networkdelay bound and packet losses. This approach is based on the Network Calculustheory, a mathematical model to represent the data flows behavior between IPsinterconnected over NoC. We propose an approach of QoS-metric based onQoS-parameter prioritization factors for multi applications-service usingcalculus model.

Network on Chip: a New Approach of QoS Metric Modeling Based on Calculus Theory