Patent ID: 7707474

Claim:
A method, comprising: controlling a variable of transmission, wherein transmission is effected by repeatedly sending data units, and a control of the variable of the transmission is performed based on a target data unit error rate; detecting whether a received data unit includes an error; analyzing, when an error is detected, a transmission number of the data unit; detecting whether an analyzed transmission number of the data unit is equal to a target transmission number, wherein the transmission number indicates a number of reception attempts at a receiver side; forwarding the data unit to a network control element when the transmission number of the data unit is equal to the target transmission number or, forwarding the data unit to the network control element when no error is detected, wherein the target transmission number indicates a target number of reception attempts at the receiver side; and determining, in the network control element, the target data unit error rate based on a ratio between receptions of data units that include an error with the transmission number being equal to the target transmission number, and receptions of data units without error.