Fuji Xerox Co., Ltd.

Chaoxin Hu

Roshan Thapliya

An information terminalsuccessively receives a plurality of packets that configure distribution data from an information distribution server, and requests the information distribution serverto change a bit rate of the packets that configure the distribution data, if it is judged that congestion occurs in communication with the information distribution serverbased on a change in time interval from transmission to reception of each of the successively received packets, and if it is judged that a packet loss rate, which is a rate of a loss packet corresponding to a loss included in the packets transmitted from the information distribution serverand calculated based on the successively received packets, is increased as compared with a value obtained by multiplying a packet loss rate before the packets that configure the distribution data are received, by a predetermined weight.

Information processing system, information processing apparatus, and non-transitory computer readable medium

An information terminal sequentially transmits one or more packets to an information distribution server, receives acknowledgments for the transmitted packets from the information distribution server, and records a round trip time and occurrence of packet loss for each of the transmitted packets. Among one or more packet sequences, the information terminal counts the number of packet sequences which are such that the number of packet losses included in each of the packet sequences and an increase state of the round trip time for packets included in the packet sequence satisfy respective predetermined conditions. Each of the one or more packet sequences has multiple continuous packets including one or more packets, for which packet loss is recorded among the transmitted packets, at the top. The information terminal calculates a packet loss ratio on the basis of the counted number and the number of transmitted packets.

Communication-information measuring device and non-transitory computer readable medium

A mobile terminal obtains a measurement value of a round-trip time in a communication channel used for communication with a server and a measurement value of a packet loss ratio in the communication channel (Sand S). Then, the mobile terminal determines whether or not a retransmission timeout is occurring in the server (S, S, and S). If a retransmission timeout is occurring in the server, the mobile terminal calculates an estimate value of the bandwidth in the communication channel by using a special throughput equation including a timeout time (S). On the other hand, if a retransmission timeout is not occurring in the server, the mobile terminal calculates an estimate value of the bandwidth by using a normal throughput equation which does not include a timeout time.

Growing community of inventors

Yokohama, Japan

Chaoxin Hu