Analysis, simulation and experimental verification of the throughput of GCRA based UPC functions for CBR streams
This paper investigates a Generic Cell Rate Algorithm (GCRA) based Usage Parameter Control (UPC) function implementing a discard function for non-conforming cells, thereby establishing a so-called Cell Discard Ratio (CDR) as UPC performance measure. Focusing on Constant Bit Rate (CBR) connections, the UPC transfer characteristics are studied in case of Peak Cell Rate Contract Violations. Also the influence of the Contracted Cell Delay Variation Tolerance value on the CDR performance of the UPC is incorporated in the study.
Algorithmic formulas found by analysis as well as simulation results are compared against the outcome of test-bed measurements. As opposed to the approach in the analysis, the simulation effectively takes into account the delay experienced by the cells accessing the ATM slotted medium, as sole origin of cell delay variation. The applicability of the simulation and the analysis is verified with measurements on real ATM cell streams, using the R2061 EXPLOIT test-bed. Although both the simulation and analysis show clear correspondence with the measurement results, slight deviations are found. These deviations can be partly explained by the slotted nature of ATM networks, which shows the importance of taking this effect into account in the performance analysis of UPC behaviour.
The study results in guide-lines for setting the parameters involved in policing ATM CBR cell streams. These guide-lines are verified by a test-bed measurement with real CBR video data transported over ATM using AAL1.
KeywordsB-ISDN ATM UPC GCRA CBR throughput analysis simulation measurements
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