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Network performance bounds, including the maximal end-toend (E2E) delay, the  maximal jitter and the maximal buffer backlog amount, are very important for  network QoS control, buffer management and network optimization. QoS-enhanced  To Next-hop Port Sequence Switch (QTNPOSS) is a recently proposed  transmission scheme to achieve scalable fast forwarding for multimedia  applications. However, the existing E2E delay bound of QTNPOSS network is not  tight. To this end, this paper presents a lower E2E delay bound for QTNPOSS  networks by using the network calculus theory, where the inherent properties  (e.g. packet length and peak rate) of the flow are taken into account.  Besides, the buffer size bound and the jitter bound of QTNPOSS network are  also presented. Moreover, by extensive numerical experiments, we discuss the  influences of the Long Range Dependence (LDR) traffic property and the  Weighted Fair Queuing (WFQ) weight on the proposed network performance  bounds. The results show that the WFQ weight influences the bounds more  greatly than the LRD property.

Worst case performance bounds for multimedia flows in QoS-enhanced TNPOSS network