Patent ID: 8699519
Filing Date: 2014-04-15
Classification: H04L

Abstract:
1. A transmission rate control method which is performed in a transmission rate control system that controls a transmission rate in accordance with a bandwidth that is estimated to be available in a communication between two communication terminals through a best effort network, transmission rate control method comprising: calculating, by a first communication terminal which communicates with a second communication terminal through the network, a round-trip delay time that occurs in the communication with the second communication terminal through the network; calculating, by the second communication terminal, a target loss event rate, when the bandwidth available in the communication is estimated to be changing, based on a past transmission rate, reported by the first communication terminal, that has been previously realized in the communication with the second communication terminal and on a round-trip delay time calculated by the first communication terminal; calculating, by the second communication terminal, an actual loss event rate when the bandwidth available in the communication is estimated to not be changing, the actual loss event rate being based on monitored loss event intervals; calculating, by the first communication terminal, a target transmission rate based on one of the target loss event rate or the actual loss event rate calculated by the second communication terminal, and the round-trip delay time, wherein calculation based on the one of the target loss event rate or the actual loss event rate is based on whether the bandwidth available is estimated to be changing or not, respectively; and controlling, by the first communication terminal, the transmission rate to be changed from a transmission rate which is set at a present time to the target transmission rate.