[특허]Digital cordless telephone system readily capable of setting up

Digital cordless telephone system readily capable of setting up 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04Q-007/20 H04J-003/00
출원번호	US-0278264 (1994-07-21)
우선권정보	JP-0179582 (1993-07-21)
발명자 / 주소	Nakahara Toru (Tokyo JPX)
출원인 / 주소	NEC Corporation (Tokyo JPX 03)
인용정보	피인용 횟수 : 24 인용 특허 : 0

초록 ▼

In a digital cordless telephone system including master and slave radio stations that are operable in response to first and second frame synchronization signals synchronized with each other to produce first and second TDMA signals in the form of radio signals, respectively, a timing signal whch is produced on the basis of the first frame synchronization signal by the master radio station is transmitted to the slave radio station through a signal line to synchronize the slave radio station with the master radio station and is received by the slave radio station after lapse of a time delay determined by a length of the signal line. The timing signal is delayed in the master radio station by a single period of the first frame synchronization signal to produce the first TDMA signal synchronized with the delayed timing signal while the timing signal received with the time delay by the slave radio station is timed by the second frame synchronization signal to produce an output synchronization signal synchronized with the second frame synchronization signal and to obtain the second TDMA signal timed by the output synchronization signal. As a result, the first and the second TDMA signals are produced at an instant coincident with each other. The timing signal may be a TDMA frame synchronization signal.

대표청구항 ▼

A digital cordless telephone system comparising a master radio station connected through an exchange to a public telephone network and a slave radio station which is connected to said master radio station through a transmission line and which is also connected to said exchange station, said master radio station being for converting a first reception signal received from said exchange station into a first TDMA signal which is transmitted in the form of a first radio signal from said master radio station while said slave radio station is for converting a second reception signal received from said exchange station into a second TDMA signal which is transmitted in the form of a second radio signal from said slave radio station, the first and the second reception signals including first and second frame synchronization signals, respectively, while the first and the second TDMA signals include first and second TDMA frame sychronization signals produced from the first and the secondd frame synchronization signals, respectively; said master radio station including: first interface means connected to said exchange station for generating said first frame synchronization signal which is derived from said first reception signal and which has a first frame period; TDMA frame synchronization signal generating means connected to said first interface means for generating said first TDMA frame synchronization signal in response to said first frame synchronization signal; TDMA signal supplying means connected to said TDMA frame synchronization signal generating means for supplying said first TDMA frame synchronization signal to said slave radio station through said transmission line; and delay means connected to said TDMA frame synchronization signal generating means for delaying said first TDMA frame synchronization signal by a delay time which is equal to said first frame period to define a first transmission time instant of said first TDMA signal; said slave radio station including: second interface means connected to said exchange station for generating the second frame synchronization signal which is derived from said second reception signal and which has a second frame period equal to said first frame period; and transmission timing adjusting means connected to said TDMA signal supplying means through said transmission line and said second interface means for adjusting said second TDMA frame sychronization signal in response to said second frame synchronization signal with reference to the first TDMA frame synchronization signal received through the transmission line to define a second transmission time instant of said second TDMA signal, said second transmission time instant being coincident with said first transmission time instant.

이 특허를 인용한 특허 (24)

Gehring, Stephan W.; Rahardja, Krisnawan; Sparrell, Carlton J, Apparatus and method for managing variable-sized data slots within a time division multiple access frame.
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Aiello,Roberto; Gehring,Stephan; Lynch,William; Rahardja,Krisnawan; Rogerson,Gerald; Sparell,Carlton J., Baseband wireless network for isochronous communication.
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Tetsuya Nagai JP; Naoya Morita JP; Masahide Morozumi JP, Communication method, data transmission method and data communication system.
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Taylor,James L., Maintaining a global time reference among a group of networked devices.
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Eun Jin-Puo,KRX, Method and apparatus for synchronizing synchronous information of each base station in cordless telephone system.
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Sayers, Ian Leslie; Long, Paul Jan; Cripps, Peter Kendall, Synchronizing clock signals in wireless networks.
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Aiello,Roberto; Sparrell,Carlton; Rogerson,Gerald, Ultra wide band base band receiver.
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Aiello,Roberto; Sparrell,Carlton; Rogerson,Gerald, Ultra wide band communication systems and methods.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

내보내기 구분	파일저장 인쇄 메일전송
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연합인증

Digital cordless telephone system readily capable of setting up 원문보기

초록 ▼

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연구과제 타임라인

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연합인증

Digital cordless telephone system readily capable of setting up 원문보기

초록 ▼

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연구과제 타임라인

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이 특허를 인용한 특허 (24)

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