Patent ID: 6671261
Filing Date: 2003-12-30
Classification: H04L

Abstract:
A method of measuring delay over a network from a first terminal to a second terminal, comprising:determining a first time difference based on a round-trip delay of a transmission over a first portion and a second portion of the network by sending a first data transmission from the first terminal to the second terminal over the second portion of the network, returning the first data transmission from the second terminal to the first terminal over the first portion of the network; and determining the first time difference between sending and receiving the first data transmission at the first terminal; determining a second time difference based on a round-trip delay of a transmission over the first portion of said network by sending a second data transmission from the first terminal to the second terminal over the first portion of the network, returning the second data transmission from the second terminal to the first terminal over the first portion of the network, and determining the second time difference between sending and receiving the second data transmission at the first terminal; and calculating a delay value by subtracting half of the second time different from the first time difference.