Queuing Performance of Long-Range Dependent Traffic Regulated by Token-Bucket Policers

Stefano Bregni, Roberto Cioffi, Paolo Giacomazzi
2008 IEEE GLOBECOM 2008 - 2008 IEEE Global Telecommunications Conference  
 Long-range dependence (LRD) is a widely verified property of Internet traffic, which severely affects network performance yielding longer queuing delays. Token-bucket policers are commonly proposed to enforce the statistical profile of input traffic, but they can hardly reduce LRD and thus can be ineffective to protect service level agreements against LRD increase in input traffic. In this paper, we investigate by simulation the queuing performance in a downstream scheduler of LRD traffic
more » ... of LRD traffic regulated by token-bucket policers. We compare the delay distributions of regulated and unregulated LRD flows. We demonstrate that policers reduce significantly the downstream queuing delay, although they do not alter much the 1/f α spectrum of regulated traffic. We observe also that the policed traffic does not obey a plain fractional Gaussian traffic model: first, it is not Gaussian anymore; moreover, also its third-order two-lags covariance is altered by the policer. Finally, we point out that policers can reduce noticeably the negative impact of traffic LRD increase on queuing delay, although they can diminish actual LRD only slightly. Index Terms  Communication system traffic, fractional noise, Internet, long-range dependence, queuing analysis, traffic control (communication). This full text paper was peer reviewed at the direction of IEEE Communications Society subject matter experts for publication in the IEEE "GLOBECOM" 2008 proceedings. 978-1-4244-2324-8/08/$25.00
doi:10.1109/glocom.2008.ecp.264 dblp:conf/globecom/BregniCG08 fatcat:3bz4ipleqfgldbml5ubng7gjs4