Design issues of a back-pressure-based congestion control mechanism

Quality of service modeling and analysis for carrier ethernet

“…A central design problem which can be investigated using our model, and is addressed in [44], is the optimization of the threshold positions while considering the trade-o¤ between throughput and delay. Challenging extensions to the present analysis are the systematic assessment of the signaling frequency in the model (that is, what is the rate at which the input process alternates between the two Markov ‡uid processes), as a function of the model parameters; this is a relevant issue, as the signaling overhead needs to be controlled.…”

“…In Section 6.2.3 we derive as many constraints as there are unknowns, so that these coe¢ -cients can be identi…ed. In Section 6.3 we demonstrate our analysis by considering a numerical example and graphically present the bu¤er content distribution; we remark that a full numerical assessment of the backpressure mechanism, relying on the methods developed in this chapter, is found in [44]. We do include here, however, numerical evidence for the claim that the two-threshold mechanism leads to a reduction of the signaling overhead.…”

“…this (plausible) formula is derived in [44]. The e¤ect of varying B 2 , for a given value of B 1 , is shown in Figure 6.3.…”

“…In Chapter 7 (based on [44]) we present an extensive numerical study of the model analyzed in Chapter 6. In particular, we address an essential design issue for the backpressure mechanism by studying the e¤ect of the congestion control thresholds on tra¢ c performance measures such as …le transfer time for data …les as well as throughput and delay for real-time applications.…”