摘要:
Each of gateways GW1, GW2 includes packet-switched network control portions 32, 33 connected to packet-switched networks, a circuit switched network control portion 35 connected to a circuit switched network, and a call control portion 31 for controlling a communication call together with the packet-switched network control portions and the circuit switched network control portion and for monitoring the traffic of the packet-switched network. The packet-switched network control portion includes plural circuit connection portions 37, 38 which can be connected to plural circuits, plural CODECs 34 having different compression ratios for enabling real-time type data transmission, and a storage data processing portion 32 for enabling store-and-forward type data transmission.
摘要:
A communication conditions determination method, a communication conditions determination system, and a determination apparatus are provided in which the conditions of communication which is performed through a plurality of communication networks are determined without setting up a special apparatus on all the communication networks and without increasing the existing traffic. In a first communication network 100 and a second communication network 200 which are connected by a first connection apparatus 1 such as a router, a determination is made as to whether the source of a packet passed through the second communication network 200 is the first connection apparatus 1 or an apparatus other than the first connection apparatus 1. Packets whose respective sources are the first connection apparatus 1 and packets whose respective sources are an apparatus other than the first connection apparatus 1 are individually summarized. By comparing summarized results, the communication conditions are determined.
摘要:
A relay device which forwards a packet received from a first device to a second device, the relay device includes a detection unit that detects that the relay device has been in a specified state, a generation unit that generates a packet that contains information for identifying the relay device and information indicating that the relay device is in the specified state when the detection unit detects that the relay device has been in the specified state, and a transmission unit that transmits the generated packet to a specific transmission destination.
摘要:
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-vendor 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.
摘要:
A method of measuring packet loss rate and device thereof, includes intermittently capturing packets during a session, counting a capture success number indicating a number of the packets captured in every period of a time for capturing the packets, and a capturable number indicating a possible number of the packets to be captured during the period of time without loss, calculating a loss rate indicating a rate of losing the packets, according to the capture success number and the capturable number for every period of time and correcting the loss rate, by the measuring device, so that the loss rate gets larger accordingly as average of capturable numbers of respective periods of time is smaller.
摘要:
A system includes 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, and a unit calculating a network load in accordance with occurrence frequencies in a specific section of the generated delay distributions.
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
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.