Method for measuring unidirectional transmission characteristics such as packet propagation time, fluctuations in propagation time and results derivable therefrom, in a telecommunications network
First Claim
1. A method for measuring unidirectional transmission properties and results derivable therefrom in a telecommunications network, comprising:
- providing a first measuring computer and a second measuring computer;
synchronizing in time the first measuring computer and the second measuring computer by a plurality of satellites so that a clock time is continuously transmitted by the plurality of satellites to the first and second measuring computers;
transmitting at least one test packet from the first measuring computer to the second measuring computer;
recording a departure time of the at least one test packet by the first measuring computer;
transmitting the departure time along with the at least one test packet;
recording an arrival time of the at least one test packet by the second measuring computer;
subtracting the departure time from the arrival time to determine a measuring result;
storing the measuring result in a database;
determining an actual delay of the at least one test packet, wherein the actual delay of the at least one test packet is equal to subtracting a computer-specific time component constant and a measuring error from the measuring result;
interrupting transmission of the at least one test packet if the plurality of satellites includes only one working satellite for a predetermined period of time;
generating a status message indicating the transmission interruption of the at least one test packet; and
resuming transmission of the at least one test packet when the plurality of satellites includes more than one working satellite.
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Accused Products
Abstract
A method for measuring unidirectional transmission properties, e.g., packet delay, delay-time fluctuations, and results derivable therefrom, in a telecommunications network. Test packets are transmitted from a first measuring computer via a measurement path to a second measuring computer. The first measuring computer records the departure time of the outgoing test packet. This clock time is transmitted along with the test packet. The second measuring computer records the arrival time of the test packet. In a subtraction operation between the departure time from the first measuring computer and the arrival time in the second measuring computer, the delay time of the test packet, i.e., the measuring result, is determined. To determine the measuring result, the two measuring computers are synchronized in time by satellite systems, e.g., GPS (global positioning system), in that the clock time is continuously transmitted to both measuring computers.
30 Citations
20 Claims
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1. A method for measuring unidirectional transmission properties and results derivable therefrom in a telecommunications network, comprising:
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providing a first measuring computer and a second measuring computer; synchronizing in time the first measuring computer and the second measuring computer by a plurality of satellites so that a clock time is continuously transmitted by the plurality of satellites to the first and second measuring computers; transmitting at least one test packet from the first measuring computer to the second measuring computer; recording a departure time of the at least one test packet by the first measuring computer; transmitting the departure time along with the at least one test packet; recording an arrival time of the at least one test packet by the second measuring computer; subtracting the departure time from the arrival time to determine a measuring result; storing the measuring result in a database; determining an actual delay of the at least one test packet, wherein the actual delay of the at least one test packet is equal to subtracting a computer-specific time component constant and a measuring error from the measuring result; interrupting transmission of the at least one test packet if the plurality of satellites includes only one working satellite for a predetermined period of time; generating a status message indicating the transmission interruption of the at least one test packet; and resuming transmission of the at least one test packet when the plurality of satellites includes more than one working satellite. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for measuring unidirectional transmission properties and results derivable therefrom in a telecommunications network, comprising:
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providing a first measuring computer and a second measuring computer; synchronizing in time the first measuring computer and the second measuring computer by a plurality of satellites so that a clock time is continuously transmitted by the plurality of satellites to the first and second measuring computers; transmitting at least one test packet from the first measuring computer to the second measuring computer; recording a departure time of the at least one test packet by the first measuring computer; transmitting the departure time along with the at least one test packet; recording an arrival time of the at least one test packet by the second measuring computer; subtracting the departure time from the arrival time to determine a measuring result; storing the measuring result in a database; subtracting a computer-specific time component from the measuring result to obtain a true delay time; storing the true delay time as a new measuring result in the database; interrupting transmission of the at least one test packet if the plurality of satellites includes only one working satellite for a predetermined period of time; generating a status message indicating the transmission interruption of the at least one test packet; and resuming transmission of the at least one test packet when the plurality of satellites includes more than one working satellite. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification