Abstract: The present invention includes a designating packet transferring step, a measurement packet transmitting step and a measurement packet collecting step. The designating packet transferring step is a step of transferring a designating packet in a target section for a communication performance measurement in the communication network, the designating packet designating a relaying apparatus which adds information to the measurement packet from among plural relaying apparatuses. The measurement packet transmitting step is a step of transmitting a measurement packet from one end of the target section. The measurement packet collecting step is a step of collecting the measurement packet transferred in the target section from among measurement packets which are transmitted in the measurement packet transmitting step.

Abstract: A communication relay device adds information to communication data without depending on a communication application of a communication terminal. The relay device (1) includes a relay control portion (13), a control information database (14), an adder portion (15) and a database for addition (16). The relay control portion (13) controls the adder portion (15) in accordance with information accumulated in the control information DB 14. The adder portion (15) adds the additional data accumulated in the database for addition (16) to decoded first contents in accordance with a control instruction by the relay control portion (13).

Abstract: A packet delay characteristic measuring apparatus that can accurately only measure a delay in a network even if a delay may occur also in a device that receives packets. The apparatus includes: a sending section for periodically sending out test packets each including sending time information to the network; a branching section for handing over the test packets flowing from the network to each of a plurality of communication paths by electrically branching a communication path; a plurality of receiving sections each of which is connected to the branching section for receiving the identical test packets and calculating delay times based on the sending time information; and a measurement value determining section for comparing a plurality of delay times calculated by each of the plurality of receiving sections for the identical test packets and determining the smallest delay time value as a measurement value.

Abstract: A monitoring apparatus which monitors an operating state of a monitored apparatus, the monitoring apparatus includes a signal acquiring unit that acquires signals output from the monitored apparatus; a communication amount acquiring unit that acquires a communication amount by which the monitored apparatus performs communication in a specific time based on information included in the plurality of signals that the signal acquiring unit acquires at a specific time interval; and a state determining unit that determines the operating state of the monitored apparatus based on the communication amount acquired by the communication amount acquiring unit.

Abstract: Packet transmission quality in a communication network is measured by transmitting a measurement packet from a packet transmission node to a packet reception node. The packet transmission node is provided with a transmission counter counting the number of packets transmitted from a packet transmission node to a packet reception node, and a measurement packet counter counting the number of measurement packets transmitted from the packet transmission node to the packet reception mode. The packet reception node is provided with a reception counter counting the number of packets received from the packet transmission node. The packet transmission node transmits a measurement packet including a transmission counter value and a measurement packet counter value, to the packet reception node which calculates the number of lost packets or a loss rate of packets on the basis of the transmission counter value, the measurement packet counter value, and a reception counter value.

Abstract: There is provided a measuring apparatus for acquiring packets being transmitted and received within a packet network and measuring communication quality on the basis of the acquired packets, the apparatus including a part that extracts packets acquired within one of given sampling periods, each sampling period set intermittently, and a part that measures communication quality on the basis of the packets acquired within the sampling period.

Abstract: Only when a request formed of a plurality of request packets obtained by dividing the request is reconstructed, the request is transmitted to a survey target node that returns a response formed of a plurality of response packets obtained by dividing the response. When no response packet has been received at all from the survey target node, it is determined that any of the request packets has been discarded on a first route from a surveying node as a transmission source of the request to the survey target node. When one or more response packets have been received from the survey target node but the response cannot be reconstructed, it is determined that any of the response packets transmitted from the survey target node has been discarded on a second route from the survey target node to the surveying node as the transmission source of the request packets.

Abstract: According to an aspect of the embodiments, a congestion detection method causes a computer to function as a congestion detection apparatus connectable to a network. Packets on the network are obtained and a packet loss is detected. A packet group made up of a series of packets based on the obtained packets is extracted. A packet loss in the packet group is detected and a position in the packet group where the packet loss occurred is detected. Whether congestion is occurring is judged based on the position of the packet loss in the packet group.

Abstract: A network fault information collecting device arranged in a packet network includes a quality degradation detecting unit which monitors packets to be regularly transmitted and received in the packet network, and detects quality degradation of the packets. The device includes a node search unit which searches for nodes on a path between transmission and reception terminals for the packet, upon detection of the quality degradation of the packets in the quality degradation detecting unit. The device includes an information collecting unit which issues an information collecting packet for each terminal searched by the node search unit, and collects and records terminal information.

Abstract: A measurement method and communication system include a writing of a creation time upon a detection packet used for detecting a communication state of a network being created into the detection packet. The method includes obtaining a send time when the detection packet was sent and sending, to a receiving apparatus which receives the detection packet, as a notification, information regarding a time period from when the detection packet was created to when the detection packet was sent. The method includes measuring, in the receiving apparatus, a delay occurring in the network based on the detection packet and the information sent as the notification.

Abstract: A packet communication quality measuring apparatus for capturing packets flowing in a packet communication network while recording capture times to measure communication quality based on the captured packets includes a detection part for detecting that a buffer in which the captured packets are stored is full and a determination part for determining a possibility of a capture failure occurring when fullness of the buffer is detected.

Abstract: A communication quality measuring apparatus comprising a connecting section establishing a connection to the packet exchange network, a capturing section capturing packets transferred over the packet exchange network, an accumulating section accumulating the packets, a control section repeating the capturing of packets in sections of fundamental processing times, a setting section setting the capturing time and the interval time within each fundamental processing time, and a determining section determining whether or not the amount of load on hardware resources of the communication-quality measuring apparatus is greater than a predetermined value.

Abstract: A system including a unit transmitting test packets to a to-be-measured communication link at a first time interval, a unit transmitting burst loads each including a series of load packets to the communication link at a second time interval, a unit performing measurement of delay time periods in a manner that a plurality of test packets transmitted by varying elapsed time periods each from an instance of transmission of the burst load to an instance of transmission of the test packet are received from the communication link in a fluctuating time interval, a unit generating delay distributions indicative of packet occurrence frequencies in relation to a delay time period of the communication link in accordance with the measured delay time periods, a unit calculating a network load in accordance with occurrence frequencies in a specific section of the generated delay distributions.

Abstract: A communication quality measuring apparatus comprising a connecting section establishing a connection to the packet exchange network, a capturing section capturing packets transferred over the packet exchange network, an accumulating section accumulating the packets, a control section repeating the capturing of packets in sections of fundamental processing times, a setting section setting the capturing time and the interval time within each fundamental processing time, and a determining section determining whether or not the amount of load on hardware resources of the communication-quality measuring apparatus is greater than a predetermined value.

Abstract: The present invention includes a designating packet transferring step, a measurement packet transmitting step, a measurement packet transmitting step and a measurement packet collecting step. The designating packet transferring step is a step of transferring a designating packet in a target section for a communication performance measurement in the communication network, the designating packet designating a relaying apparatus which adds information to the measurement packet from among plural relaying apparatuses. The measurement packet transmitting step is a step of transmitting a measurement packet from one end of the target section. The measurement packet collecting step is a step of collecting the measurement packet transferred in the target section from among measurement packets which are transmitted in the measurement packet transmitting step.

Abstract: Communication quality values such as delay times of packets transmitted and received within a packet network are measured, and a threshold value is calculated based on the measured communication quality values. Further, a management reference value is calculated based on the communication quality values of packets whose measured communication quality values are within a range based on the threshold value. A communication state is detected by comparing the measured communication quality values with the management reference value.

Abstract: The present invention enables accurate simulation of the state of communication over a communication network in which a communication channel of different communication characteristic is set for each protocol and session, such as a VoIP network built in a multi-vender environment, and evaluation of communication quality of communications between IP phones, etc. over a supposed communication network. A relay device for relaying packet communications between a plurality of communication devices is used, and the relay device sets a virtual processing unit as an initial process so that it corresponds to the packet transmission direction and/or attribute, based on the contents of a received packet specified by a control protocol, and relays communications of packets after the initial process, based on the packet loss rate and delay time distribution indicated by communication state information associated with the processing unit.

Abstract: When simulating communication using a communication network such as a VoIP network, an actual communication state is accurately simulated, and communication is simulated. The distribution of delay times of packets is transformed by a predetermined transformation method, packet transmission timings to which delay times are added, are calculated based on the transformed distribution of delay times and predetermined transmission timings, a determination is made as to whether or not the packet transmission order is changed by the calculated transmission timings to which delay times are added, and, when a determination is made that the packet transmission order is changed, packet transmission timings adjusted so as not to cause a change in the transmission order are derived.

Abstract: The present invention provides a communication assistance process that is performed by a communication assistance device connected to a plurality of user terminals via a network. During a communication (or video) conference call, when assistance data associated with a topic in the conference is provided to a plurality of user terminals in the form of a voice data, the communication assistance process adjusts the sound volume of voice data in the assistance data if it was determined that voice data is included in the communication data received from the plurality of user terminals, and if voice data is also included in the assistance data, the assistance data that includes sound volume adjusted voice data is then provided to the plurality of user terminals. Accordingly, the communication assistance process allows communications in a conference system to proceed smoothly.

Abstract: The invention provides a packet communication system, a packet communication method, a transmission apparatus, and a storage medium having stored therein a computer program used in the transmission apparatus. The transmission apparatus generates a random number, sets a packet transmission interval based on the generated random number, and transmits a packet in the packet transmission interval. In addition, the transmission apparatus transmits a load density detection packet for detecting traffic load density, receives from a reception apparatus transmission quality information about the delay and/or loss rate of the load density detection packet, and calculates, based on the received transmission quality information, a time at which delay is smallest in a packet transmission interval and/or a time at which a loss rate is lowest in the packet transmission interval. The transmission apparatus sets the calculated time as a packet transmission start time and starts packet transmission.