Packet scale rate guarantee for non-FIFO nodes
Le Boudec, J.-Y.; Charny, A.
Networking, IEEE/ACM Transactions on
Volume 11, Issue 5, Oct. 2003 Page(s): 810 - 820
Digital Object Identifier   10.1109/TNET.2003.818188
Summary: Packet scale rate guarantee (PSRG) is a generic node model which underlies the definition of expedited forwarding (EF) proposed in the context of Internet differentiated services. For the case of first-in-first-out (FIFO) nodes, PSRG is equivalent to the well-understood concept of adaptive service curve. However, in practice, many devices do not necessarily preserve the FIFO property, and therefore, known FIFO results do not hold. This paper analyzes the properties of PSRG in the absence of FIFO assumption. Our analysis is based on a novel characterization of PSRG which avoids the use of virtual finish times and is obtained by min-max algebra. We use it to show that delay bounds previously obtained for the FIFO case are still valid; in contrast, we find that this is not true for the characterization of the concatenation of two nodes.

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