Statistical measurement equipment and telecommunication system using same
First Claim
1. Statistical measurement equipment to determine whether a variable relating to a rate at which data are transmitted over a particular communication link is within a predetermined probability distribution function of expected values for said variable, said equipment comprising at least one counter,measuring means for establishing a sequence of measurement cycles and for determing a measured value of said variable at least at the end of each of said measurement cycles, andstepping means responsive to the measured value determined by the measuring means for stepping each said counter by a respective step selected from at least two predetermined counter steps such that after a plurality of said cycles, said each counter indicates whether a respective predetermined expected value for said variable in the tail of said predetermined probability distribution function is exceeded with a respective actual frequency that is greater than a corresponding predicted frequency derived from said predetermined probability distribution function.
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Accused Products
Abstract
The measurement equipment (SMC) is used in a telecommunication switching system to check if the cell rate of each of a plurality of individual cell streams multiplexed in a same link remains within the limits on the basis of which its multiplexing was allowed. To this end the equipment checks at the end of each measurement interval (MTI) and for a plurality of cell rates [(M-S)/A, (M-S/2)/A, . . .] if the expected probabilities to exceed these cell rates are exceeded or not. In the positive the cell rate is limited by dropping cells. Thus an expected complementary (with respect to 1) cumulative probability distribution function of the cell rate is approximated by a staircase-shaped function.
64 Citations
25 Claims
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1. Statistical measurement equipment to determine whether a variable relating to a rate at which data are transmitted over a particular communication link is within a predetermined probability distribution function of expected values for said variable, said equipment comprising at least one counter,
measuring means for establishing a sequence of measurement cycles and for determing a measured value of said variable at least at the end of each of said measurement cycles, and stepping means responsive to the measured value determined by the measuring means for stepping each said counter by a respective step selected from at least two predetermined counter steps such that after a plurality of said cycles, said each counter indicates whether a respective predetermined expected value for said variable in the tail of said predetermined probability distribution function is exceeded with a respective actual frequency that is greater than a corresponding predicted frequency derived from said predetermined probability distribution function.
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13. Statistical measurement equipment responsive to a rate at which data are transmitted over a particular communication link, said equipment comprising
means for determining, for at least one predetermined value of said rate in the tail of an associated probability distribution function, a frequency with which said rate actually exceeds said predetermined value, and means for changing said rate to limit said frequency to an expected value thereof.
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18. Statistical measurement equipment to determine whether a variable relating to the rate at which data are transmitted over a particular communication link is within a predetermined probability distribution function of expected values for said variable, said equipment comprising
at least one counter, measuring means for determining a measured value of said variable at least at the end of each measurement cycle, and stepping means responsive to the measured value determined by the measuring means for stepping at least one said counter by a respective step selected from at least three predetermined counter steps such that after a plurality of said cycles, said at least one counter indicates whether either of at least two predetermined expected values for said variable are exceeded with a respective actual frequency that is greater than a corresponding predicted frequency derived from said predetermined probability distribution function.
Specification