US 12,363,014 B2
Method and system for determining a size of a buffer of a device-under-test
Andreas Michl, Munich (DE)
Assigned to Rohde & Schwarz GmbH & Co. KG, Munich (DE)
Filed by Rohde & Schwarz GmbH & Co. KG, Munich (DE)
Filed on Nov. 9, 2022, as Appl. No. 18/054,033.
Prior Publication US 2024/0154891 A1, May 9, 2024
Int. Cl. H04L 43/0829 (2022.01); H04L 43/065 (2022.01); H04L 43/0894 (2022.01); H04L 43/50 (2022.01)
CPC H04L 43/0829 (2013.01) [H04L 43/065 (2013.01); H04L 43/0894 (2013.01); H04L 43/50 (2013.01)] 13 Claims
OG exemplary drawing
 
12. A system for determining a size of a buffer of a device-under-test, DUT, comprising:
a transceiver device configured to establish a communication connection to the DUT;
wherein the transceiver device is configured to transmit a data stream to be received by the DUT or to receive a data stream that was transmitted by the DUT; wherein, in each case, the data stream is transmitted with a transmitting bit rate and received with a receiving bit rate; and wherein the data stream is loaded into the DUT buffer during reception respectively during transmission by the DUT;
a control device which is configured to detect a difference between the transmitting bit rate and the receiving bit rate over time;
wherein the control device is configured to monitor a packet loss at the receiver side, and to detect a time at which a packet error rate, PER, at the receiver side increases above a threshold based on the monitored packet loss;
wherein the control device is further configured to calculate the size of the DUT buffer based on a difference between an amount of data transmitted by the DUT respectively the transceiver device and an amount of data received by the transceiver device respectively the DUT from the start of the transmission until the detected time of the PER increase;
wherein the transceiver device comprises a transmit and a receive buffer, wherein the data stream is loaded into the transmit buffer during transmission respectively into the receive buffer during reception by the transceiver device;
wherein the control device is configured to calculate the size of the DUT buffer by:
calculating an integral of the difference between the transmitting bit rate and the receiving bit rate from the start of the transmission until the detected time of the PER increase, and
subtracting an occupancy of the transmit respective receive buffer of the transceiver device at the time of the PER increase from said integral of the difference between the transmitting and receiving bit rate.