[특허]Wireless communications system

[미국특허] Wireless communications system 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04B-007/00 H04B-001/38
출원번호	US-0939523 (1997-09-29)
우선권정보	EP-0402254 (1997-09-26)
발명자 / 주소	Navaro William,FRX Fauconnier Denis,FRX Le Strat Evelyne,FRX
출원인 / 주소	Nortel Networks Corporation, CAX
대리인 / 주소	Lee, Mann, Smith, McWilliams, Sweeney & Ohlson
인용정보	피인용 횟수 : 73 인용 특허 : 17

초록 ▼

The present invention relates to wireless communication systems and in particular to wireless communication systems which employ coder-decoder means in the transmission of information between two parts of the system. One aspect of the present invention provides method of setting up a wireless communications link between two radio stations which each communicate with a respective base station by the use of a selected one of several codecs; the method comprising: the signalling by each party to the other party of the codecs supported between each radio station and base station by said each party; and selecting an appropriate codec based upon the signalling information, whereby the quality of the link is maximised.

대표청구항 ▼

[ What is claimed is:] [1.] A method of setting up a wireless communications link between two subscriber radio stations which each communicate with a respecting base station by the use of a selected one of several codecs;the method comprising:the signalling by each subscriber radio station to the other subscriber radio station of the codecs supported between each subscriber radio station and base station by said each subscriber radio station; anddetermining an appropriate codec for each subscriber radio station and base station pair, as deemed necessary based upon the signalling information,wherein the determination of an appropriate codec is made with reference to data provided in the form of a look-up table;wherein the look-up table takes into account:the codec presently employed by a subscriber radio station in establishing a call;the codecs supported by each subscriber radio station to base station link;the look-up table determining which codecs should be employed between each subscriber radio station and base station; and, changing the codec presently in use by either one or both of the subscriber radio stations as determined by the look-up table wherein, in the instance that the codecs supported between the two subscriber radio stations are common, tandem free operation is established, whereby the quality of the link is maximised.

이 특허에 인용된 특허 (17) 인용/피인용 타임라인 분석

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Blakeney ; II Robert D. ; Tiedemann ; Jr. Edward G., Method for providing service and rate negotiation in a mobile communication sytstem.
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Walsh Dale M., Mode signalling method and apparatus.
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Armbruster Peter Joseph ; Wild Johanna Alexandra, Radio telecommunication network and method for unobtrusive call interception via transcoder bypass.
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Panech Eric (Givataiim ILX) Handzel Mark J. (San Diego CA) Morley Steven Allan (San Diego CA) Avis Graham M. (San Diego CA), Subscriber RF telephone system for providing multiple speech and/or data signals simultaneously over either a single or.
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Paneth Eric,ILX ; Handzel Mark J. ; Morley Steven Allan ; Avis Graham M., Subscriber RF telephone system for providing multiple speech and/or data signals simultaneously over either a single or.
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Jung Stefan,SEX ; Galyas Peter,SEX, Transporting user data over A-Bis and A-interfaces within a mobile telecommunications network.
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Allpress Stephen Alan ; Malvone Christopher Nicholas ; O'Brien Francis Edward ; Ozarow Lawrence Howard, Variable rate coding for wireless applications.
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Hassan Amer A. ; Karabinis Peter D. ; Rydbeck Nils Rutger, Vocoder apparatus using the link margin.
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Mladenovic, Zoran; Kumar, Nagendra; Morgan, Edward B., Apparatus and method for improving voice quality by removing tandem codecs in a voice communication link.
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[미국특허] Wireless communications system 원문보기

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