One-way delay time measuring method and one-way delay time measuring device as well as the one-way delay time measurement program

摘要

PPROBLEM TO BE SOLVED: To perform end-to-end measurement containing a transmission lag in voice codec such that one device does not depend on the other device for measuring a one way time lag. PSOLUTION: A first communication terminal measures a time Δt1 (1) elapsing before the partner's measurement signal is received for the first time after the measurement signal is transmitted, and a time Δt1 (2) elapsing before the partner's second measurement signal is received after the measurement signal is transmitted. A second communication terminal measures a time Δt2 elapsing before the measurement signal is transmitted for the first time after the partner's measurement signal is received, calculates Ta (1) based on the difference between the Δt1 (1) and the Δt2, calculates Ta (2) based on the difference between the Δt1 (2) and the Δt2, selects Ta (1) or Ta (2) satisfying a relation 0TaTi as the reciprocation time lag T between communication terminals assuming the time interval for transmitting the measurement signal at the first communication terminal is Ti, and determines one way time lag td=T/2. PCOPYRIGHT: (C)2005,JPO&NCIPI