Fujitsu Corporation

Kazuya Takeuchi

Yasuaki Kamimura

Hiroaki Tamai

Naoto Miyauchi

Takafumi Kawakami

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

Growing community of inventors

Mitaka, Japan

Kazuya Takeuchi