On a class of time varying shapers with application to the renegotiable variable bit rate service

A shaper is a system that stores incoming bits in a bu er and delivers them as early as possible, while forcing the output to be constrained with a given arrival curve. A shaper is time invariant if the tra c constraint is de ned by a xed arrival curve it is time varying if the condition on the output is given by a time varying tra c contract. This occurs, for example, with renegotiable variable bit rate (RVBR) services. We focus on the class of time varying shapers called time varying leaky bucket shapers such shapers are de ned by a xed numbers of leaky buckets, whose parameters (rate and bucket size) are changed at speci c transition moments. We assume that the bucket levels are kept unchanged at those transition moments (\no reset" assumption). Our main nding is an input-output characterisation for this class of time varying shapers. Then we apply it to the tradeo in optimising the RVBR service, assuming that a perfect prediction of future tra c can be made. We provide two al...

• Type: Journal
• Year: 2000
• Where: JHSN
• Authors: Silvia Giordano
• Keywords: Arrival Curve, JHSN 2000, Leaky Buckets, RVBR Service