Title:
通信システム、通信端末及び通信方法
Document Type and Number:
Japanese Patent JP4075461
Kind Code:
B2
Abstract:
From an electric pole outside to a cordless handset inside a building/facility, a communication line is established via an electric power line. At this point, it is judged whether or not electric power line communication is possible, and if electric power line communication is possible, the communication line between the cordless handset and a base unit is switched to an electric power line communication system, and a communication line is formed via an optical fiber cable from the electric power line. By measuring the communication quality levels of all lines of the wireless and electric power lines, the communication line having the highest communication quality level may be selected.
Inventors:
Keiji Akiyama
Konji Satoshi
Konji Satoshi
Application Number:
JP2002148227A
Publication Date:
April 16, 2008
Filing Date:
May 22, 2002
Export Citation:
Assignee:
ソニー株式会社
International Classes:
H04B1/74; H04B3/54; H04L1/00; H04L1/20; H04L1/22; H04L12/28; H04M1/00; H04M1/725; H04W84/12; H04W88/06; H04L1/16
Domestic Patent References:
| JP2749248B2 | ||||
| JP2583238Y2 | ||||
| JP2003140811A | ||||
| JP2002312155A | ||||
| JP2000222125A | ||||
| JP9251529A |
Attorney, Agent or Firm:
Yoshitsuno Kakuda
Hironobu Isoyama
Yoshitsuno Kakuda
Hironobu Isoyama
Hironobu Isoyama
Yoshitsuno Kakuda
Hironobu Isoyama