Title:
無線通信システム
Document Type and Number:
Japanese Patent JP5739280
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To prevent howling and difficulty in speaking in inter-mobile station communication through a base station or communication between a command desk and a mobile station.SOLUTION: A radio communication system comprises: a mobile station having a speaker and a receiver of a small sound volume; a base station; and a command desk that communicates with the mobile station through the base station and has a speaker, where a call signal transmitted by the mobile station or the command desk includes an identifier for identifying the mobile station or the command desk that is a transmission source of the call signal. The base station has a configuration in which: the call signal is transmitted at a first frequency, and received at a second frequency; the call signal from the command desk is transmitted by radio during receiving the call signal from the command desk; and the call signal from the transmission source mobile station is looped back and transmitted by radio when the call signal from the command desk is not received. The mobile station turns off the speaker and receiver when an identifier of the received call signal is the same as that of the mobile station.
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Inventors:
Yanagi Hideyuki Tani
Takamitsu Hinata
Minoru Uchida
Hosono Masami
Hironobu Senoo
Takamitsu Hinata
Minoru Uchida
Hosono Masami
Hironobu Senoo
Application Number:
JP2011185612A
Publication Date:
June 24, 2015
Filing Date:
August 29, 2011
Export Citation:
Assignee:
Hitachi Kokusai Electric Co., Ltd.
International Classes:
H04L5/06; H04M3/18; H04M3/42; H04W4/10
Domestic Patent References:
| JP2011124829A | ||||
| JP6135634A | ||||
| JP2000354112A | ||||
| JP10285101A | ||||
| JP200955181A | ||||
| JP1023523A | ||||
| JP200921768A | ||||
| JP2005101799A |
Other References:
狭帯域デジタル通信方式(SCPC/FDMA)ARIB STD-T61 1.2版 第1分冊,2005年11月30日,P.27,28,30,37,38,付1-11,付1-12,URL,http://www.arib.or.jp/english/html/overview/doc/1-STD-T61v1_2-1p3.pdf
狭帯域デジタル通信方式(SCPC/FDMA)ARIB STD-T61 1.2版 第2分冊,2005年11月30日,P.77,78,85,90,111,URL,http://www.arib.or.jp/english/html/overview/doc/1-STD-T61v1_2-2p3.pdf
狭帯域デジタル通信方式(SCPC/FDMA)ARIB STD-T61 1.2版 第2分冊,2005年11月30日,P.77,78,85,90,111,URL,http://www.arib.or.jp/english/html/overview/doc/1-STD-T61v1_2-2p3.pdf
Attorney, Agent or Firm:
Polaire Patent Business Corporation