Patent ID: 8699337
Filing Date: 2014-04-15
Classification: H04L

Abstract:
1. A communication terminal used in a communication system which performs data transmission and reception between a plurality of communication terminals through a network, comprising: a first transmission bandwidth control unit which performs transmission bandwidth control independently of a state of the network; a second transmission bandwidth control unit which performs transmission bandwidth control depending on a state of the network; and a bandwidth measuring unit which measures the transmission bandwidth when bandwidth control is shifted to bandwidth control by the second transmission bandwidth control unit, wherein when transmission is started, bandwidth control by the first transmission bandwidth control unit is performed and a certain number of packets are transmitted, a data amount of the certain number of packets which reception is confirmed by an acknowledgement packet to the certain number of packets is divided by a time required for the reception of the acknowledgement packet and a packet which value obtained by the division is set as a transmission bandwidth is transmitted, and a transmission bandwidth is measured by using the transmitted packet as a measurement packet for calculating an optimum bandwidth and bandwidth control by the second transmission bandwidth control unit is performed by the measured transmission bandwidth.