RADIO COMMUNICATION SYSTEM, RADIO TERMINAL, AND COMMUNICATION METHOD

• Main Authors: YAMAMOTO MASAHIRO, YAMASHITA MASUMI
• Format: Patent
• Language: English; Japanese
• Published: 27.10.2014
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; WIRELESS COMMUNICATIONS NETWORKS

PROBLEM TO BE SOLVED: To solve a problem of a radio terminal consuming a lot of power in the prior art technique because each radio terminal (slave unit) has to regularly measure a reception level and notify a management device (master unit) of it.SOLUTION: A slave unit transmits a transmission message and receives a reply message transmitted by a master unit, increases transmission output of a next transmission message when the reception electric field strength of the reply message is at or lower than an electric field strength threshold value at least once, and decreases transmission output of a next transmission message when the reception electric field strength of the reply message is larger than an electric field strength threshold value at least once. 【課題】従来の技術において、各無線端末（子機）は、定期的に受信レベルの測定及び管理装置（親機）への通知を行わなければならない。そのため、無線端末において、電力を多く消費するという課題があった。【解決手段】子機は、送信電文を送信し、親機から送信された返送電文を受信し、返送電文の受信電界強度が少なくとも１回電界強度閾値以下になった時、次回の送信電文の送信出力を大きくし、返送電文の受信電界強度が少なくとも１回前記電界強度閾値より大きくなった時、次回の送信電文の送信出力を小さくする。【選択図】図３