Kddi Corporation

Kiddi Corporation

Atsushi Tagami

Toru Hasegawa

Teruyuki Hasegawa

Kazuaki Ueda

Kenji Yokota

Hajime Nakamura

Shigehiro Ano

Atsuo Tachibana

Hiroki Furuya

Jun Kurihara

Chikara Sasaki

Kouji Nakao

A transfer apparatus for a content distribution network in which a content is divided into one or more objects and distributed includes: a determination unit configured to, upon receiving a first request packet, determine whether the first request packet is to be processed; a monitor unit configured to, when the first request packet is to be processed, determine a requested content corresponding to a requested object requested by the first request packet, and monitor a second request packet that requests an object of the requested content for a predetermined period; and a transmission unit configured to, when the second request packet satisfies a predetermined condition, generate and transmit a third request packet that requests an object that differs from the objects requested by the first request packet and the second request packet among objects of the requested content.

Transfer apparatus for content distribution network

A transfer device includes: a determination unit configured to determine, if a data packet including content and list information is received as a response to a transferred request packet, whether or not the content can be transmitted to a transfer device that has transmitted the request packet, based on an identifier of the transfer device that has transmitted the request packet and the list information. The list information included in the data packet is generated based on an identifier of a transfer device to which the content included in the data packet can be transmitted, of a plurality of transfer devices in the content distribution system, or is generated based on an identifier of a transfer device to which the content included in the data packet cannot be transmitted.

Server device and transfer device for content distribution system

A communication device includes: a forwarding unit configured to determine, if a first packet is directed to the communication device, whether or not a forwarding destination address of the first packet can be specified based on a value contained in a first field of the first packet, the forwarding unit setting, if it can be specified, the specified forwarding destination address as the destination address of the first packet and forwarding the first packet; and a processing unit configured to perform, if no forwarding destination address of the first packet can be specified and the first packet includes a request packet that requests an object according to an object name of the object, processing for specifying the forwarding destination of the first request packet based on the object name.

Communication device and computer-readable storage medium

A channel-switching multicast distribution apparatus in a system for providing channels by multicast. The apparatus includes a device for receiving multicast data of a first multicast group for a first channel; a device for storing the received multicast data; a delaying device for reading the stored multicast data, and delaying the data by a predetermined time; and a transmission device for transmitting the delayed data through a second multicast group for performing channel switching so as to select the first channel. Instead of the delaying device and the transmission device, a data rearranging device for reading the stored multicast data, and rearranging the data so as to change the order of packets thereof; and a transmission device for transmitting the rearranged data through a second multicast group for performing channel switching so as to select the first channel may be provided.

Channel switching multicast distribution apparatus and method, and multicast reception apparatus

The present invention detects a failure location of network in the Internet. A pair of networks consists of an access network and an Internet service provider network, and a route consists of a source pair of networks and a destination pair of networks. The quality information values are inputted to elements in a matrix that all pairs of networks are put in same order as rows (or columns) of source pairs of networks and columns (or rows) of destination pairs of networks. If inferior quality values in the matrix line up in the row (or column), a failure is determined in a destination (or a source) pair of networks in column side (or row side) corresponding to a row (or a column). If inferior quality values line up in a slanting direction, a failure is determined in a route between the Internet service provider networks indicated to the slanting direction.

Method for detecting failure location of network in the Internet

Data of traffic with long-range dependence characteristics is generated by a host terminal and transferred to a memory arranged on a board. The memory stores the traffic data comprising at least one of the number of IP packets output per unit time and total number of bytes, a set value of each parameter of the generated IP packets (i.e., packet length table) and an IP address table. A packet generation section refers to the data in the memory to generate traffic with long-range dependence characteristics at a speed corresponding to a high-speed network. As a result, the behavior of the network at the time of application of the load can be measured before the actual use of the network. According to the present invention, a traffic generation apparatus that can supply the actual network with a load close to the real traffic can be provided.

Growing community of inventors

Fujimino, Japan

Atsushi Tagami