Fujitsu Corporation

Hiroaki Tamai

Yasuaki Kamimura

Naoto Miyauchi

Takafumi Kawakami

Kazuya Takeuchi

Katsumi Kobayashi

Akira Okubo

Yoshihiko Shirokura

Hiroaki Kawasumi

Shigemasa Matsubara

Yukio Hayashi

Masahiro Machida

Mitsuaki Yasuoka

Yosuke Nishikata

Tetsuhiro Murata

A communication device is provided in a wireless multi-hop network. The communication device receives a sequence number, a divided time acquired by dividing a time width allocated for transmitting detected usage data by a division number, and the division number. The communication device calculates a remainder by dividing the received sequence number by the division number and calculates a transmission offset time based on the remainder and the divided time. The communication device transmits the usage data based on the calculated transmission offset time.

Communication device and communication method

The present invention increases accommodation efficiency in a wireless master station for wireless slave stations, and efficiently uses wireless resources while controlling traffic. In a communication system in which a plurality of wireless slave stations---, . . . , perform wireless communication with wireless master stations-and-directly or through another wireless slave station and which performs communication from the wireless master stations with a collection control deviceby means of wired communication or the like. The collection control devicestores first through fourth threshold values a, b, c, and d in memory, and makes efficient use while suppressing traffic by performing a 'connection suppression notification', a 'specific high-frequency communication stop notification', and an &#x201c;accommodation refusal notification&#x201d;, and performs functionality control through stages according to the number of accommodated wireless slave stations.

Communication system, congestion avoidance method thereof, and meter reading system using communication system

An entry compression/decompression method for use in a packet relay apparatus carrying out flow identification based on an entry of a flow table describing a pattern of a packet as a subject of flow identification, comprising the steps of judging whether a new pattern to be registered in the flow table is an incremental pattern, that is, a difference with a flow identification pattern of the entry is one bit; changing a mask pattern of the entry indicating a position of a 'don't care bit'in relation with the flow identification pattern in flow identification if the new pattern is an incremental pattern; and additionally registering the new pattern in the flow table as an entry if the new pattern is not an incremental pattern.

Entry compression/decompression method and apparatus performing an entry compression and decompression

An information collecting apparatus judges whether the received packet corresponds to a monitoring target, adds identifying information to the judged monitoring target packet, adds process information indicating a user policy used in processing of the monitoring target packet at each function processing units to the monitoring target packet, and stores each process information added to the monitoring target packet, in association with the identifying information added to the monitoring target packet.

Program, method and apparatus for collecting information

Growing community of inventors

Kawasaki, Japan

Hiroaki Tamai