公开(公告)号：US20130143616A1

公开(公告)日：2013-06-06

申请号：US13676909

申请日：2012-11-14

Applicant: HITACHI, LTD.

Inventor： Changho HAN ,  Shiro MAZAWA ,  Michio IGUCHI

IPC: H04W52/18

CPC classification number: H04W52/18 ,  H04W52/244 ,  H04W52/267 ,  H04W52/325 ,  H04W52/367

Abstract: When a mobile station registered at a closed-type femtocell base station is in a connection state in a cell area covered by the femtocell base station, the transfer power of the femtocell base station for a cell identification signal is adjusted according to one scale estimating the receiving quality of the cell identification signal at the mobile station. When no mobile station is located in the cell area covered by the femtocell base station, the cell identification signal is sent with the minimum transmission power necessary for a mobile station to make a call in the cell area to reduce the power consumption of the femtocell base station and also to reduce interference with other macrocell base stations and other femtocell base stations.

Abstract translation: 当在密闭式毫微微小区基站登记的移动站处于由毫微微小区基站覆盖的小区区域的连接状态时，根据一个比例估计用于小区识别信号的毫微微小区基站的传送功率， 在移动站接收小区识别信号的质量。 当没有移动站位于毫微微小区基站覆盖的小区区域中时，小区识别信号以移动台在小区区域中进行呼叫所需的最小发射功率发送，以减少毫微微小区基站的功耗 并且还减少与其他宏小区基站和其他毫微微小区基站的干扰。

公开(公告)号：US20170241958A1

公开(公告)日：2017-08-24

申请号：US15518896

申请日：2015-03-23

Applicant: Hitachi, Ltd.

Inventor： Hisanori MATSUMOTO ,  Shiro MAZAWA ,  Michio IGUCHI

IPC: G01N29/30

CPC classification number: G01N29/30 ,  G01H1/00 ,  G01H3/005

Abstract: There is disclosed a method of detecting failures or anomalies of a large number of sensor terminals without using manpower or expensive equipment in the seismic exploration business. The method includes preparing a plurality of sensor terminals having sensors that detect vibrations from outside, the plurality of sensor terminals receiving the vibrations and outputting vibration reception signals, and comparing a first vibration reception signal output by a first sensor terminal with a second vibration reception signal output by a second sensor terminal, thereby detecting if one of the first sensor and the second sensor is failed or anomalous.