[특허]Soft handover system for a multiple sub-carrier communication system and method thereof

[미국특허] Soft handover system for a multiple sub-carrier communication system and method thereof 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04Q-007/20 H04Q-007/36
출원번호	US-0928307 (1997-09-12)
발명자 / 주소	Brink Stephan ten,DEX van Nee Richard D. J.,NLX
출원인 / 주소	Lucent Technologies, Inc.
인용정보	피인용 횟수 : 208 인용 특허 : 6

초록 ▼

A soft handover system is provided for a multiple sub-carrier communication system, applicable to the uplink (mobile unit to base stations) and/or the downlink (base stations to mobile unit). The soft handover system uses multiple sub-carriers to simultaneously transmit multiple sub-carrier signals between at least two base stations and the mobile unit in the uplink and/or downlink. In certain embodiments, the soft handover system provides for synchronized multiple sub-carrier transmission such that the delay differences between the multiple sub-carrier transmissions from the different base stations arriving at the mobile unit are within the guard time of the multiple sub-carrier symbols. Certain embodiments of the soft handover system use the same set of sub-carriers for links between the mobile unit and the base stations of different cells, and other embodiments use different sets of sub-carriers for links between the mobile unit and the base stations of different cells. In the soft handover system using the same set of sub-carriers, the mobile unit receives downlink signals with identical data content from the different base stations. The mobile unit need not distinguish between the signals from the different base stations. The mobile unit just treats the downlink signals from the different base stations as multipath components, thereby increasing the diversity gain. In the case of a multiple sub-carrier CDMA system, the soft handover system can use the same sub-carriers as well as the same CDMA encoding and/or spreading code.

대표청구항 ▼

[ We claim:] [1.] A method for providing data signals, said method comprising the steps of:transmitting from a first base station portions of a data signal in parallel on multiple sub-carriers as multiple sub-carrier symbols; andtransmitting from at least a second base station portions of said data signal in parallel on multiple sub-carriers as multiple sub-carrier symbols so that a mobile unit receives said data signal from at least two base stations to achieve soft handover.

이 특허에 인용된 특허 (6) 인용/피인용 타임라인 분석

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Malkamaki Esa (Espoo FIX) Jokinen Harri (Hiisi FIX), Method and apparatus providing handoff of a mobile station between base stations using parallel communication links esta.
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Blakeney ; II Robert D. (San Diego CA) Karmi Gadi (San Diego CA) Tiedemann ; Jr. Edward G. (San Diego CA) Weaver ; Jr. Lindsay A. (San Diego CA), Mobile station assisted soft handoff in a CDMA cellular communications system.
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Brajal Americo (Villeneuve le Roi FRX) Chouly Antoine (Paris FRX), Multicarrier frequency hopping communications system.
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Sampath, Hemanth; Kadous, Tamer, Sphere decoding apparatus.
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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

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[미국특허] Soft handover system for a multiple sub-carrier communication system and method thereof 원문보기

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[미국특허] Soft handover system for a multiple sub-carrier communication system and method thereof 원문보기

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