Patent ID: 8750356

Claim:
A method for measuring an asymmetric delay of a communication path, comprising: sending, by a first node, a first delay measurement message to a second node, wherein a local clock of the second node is synchronized with a local clock of the first node; receiving, by the first node, a second delay measurement message from the second node after the second node receives the first delay measurement message, wherein the second delay measurement message comprises a time when the second node receives the first delay measurement message and a time when the second node sends the second delay measurement message; calculating, according to the time when the first delay measurement message is sent by the first node and the time when the second node receives the first measurement message, a communication path delay in a direction towards the second node; calculating, according to the time when the second node sends the second delay measurement message and the time when the second measurement message is received by the first node, a communication path delay in a direction leaving the second node; and obtaining a measured value of the asymmetric delay of the communication path according to the communication path delay in the direction towards the second node and the communication path delay in the direction leaving the second node, wherein the measured value of the asymmetric delay of the communication path is equal to ½ of the difference between the communication path delay in the direction leaving the second node and the communication path delay in the direction towards the second node.