Fujitsu Corporation

Yosuke Nishikata

Yoshihiko Shirokura

Taiji Kondo

Takahiro Koharagi

Takao Ito

Yukio Hayashi

Yasuaki Kamimura

Katsumi Kobayashi

Koichi Ishibashi

Hiroaki Kawasumi

Shigemasa Matsubara

Shinichi Hirata

Hiroaki Tamai

Naoto Miyauchi

Mitsuaki Yasuoka

Masahiro Machida

Kobun Nakajima

Kazuya Takeuchi

Takafumi Kawakami

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

A data communication apparatus forms a mesh network together with at least one gateway includes a frame generating unit and a frame transferring unit. The frame generating unit generates a meter data frame to transmit to a gateway. The meter data frame is a frame including meter data. The frame transferring unit transfers the meter data frame received from another data communication apparatus. The meter data frame is addressed to the gateway. The frame generating unit transmits the meter data frame to which number of alternate routing that indicates number of allowable transmission attempts from a data communication apparatus adjacent to a destination gateway of the meter data frame to the gateway is added. The frame transferring unit changes the number of alternate routing added thereto to a value smaller by 1 than a value that has been set and transits the meter data frame to another data communication apparatus.

Data communication apparatus, data communication system, and data communication method

An ad hoc network system includes a plurality of nodes that communicate with a specific node. Each of the nodes includes a calculator and a selector. The calculator calculates a cumulative value of the number of communication nodes connected through the node by adding the numbers of communication nodes from an upstream side, which is a side closer to the specific node than the node, to the node. The selector selects a node serving as a connection destination out of the nodes located on the upstream side on the basis of the cumulative value of the number of communication nodes calculated by the calculator.

Ad hoc network system and route selection method

Growing community of inventors

Tokyo, Japan

Yosuke Nishikata