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公开(公告)号：BR0001754A
公开(公告)日：2001-03-13
申请号：BR0001754
申请日：2000-05-15
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CLOUTIER JOSEPH E , KUMAR SARATH , KNISELY DOUGLAS N , NANDA SANJIV
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公开(公告)号：AU3944100A
公开(公告)日：2000-12-14
申请号：AU3944100
申请日：2000-06-13
Applicant: LUCENT TECHNOLOGIES INC
Inventor： KUMAR SARATH , NANDA SANJIV , RUBIN HARVEY , VITEBSKY STANLEY
IPC: H04B7/005 , H04B7/26 , H04W36/18 , H04W52/12 , H04W52/54 , H04Q7/38 , H04Q11/00 , H04L12/56 , H04J13/00
Abstract: A back haul architecture effectively reduces the reactivation times for both forward-link and reverse-link data transmissions over CDMA wireless communications systems, by relying on packet-mode transmissions over the back haul between a frame selection/distribution (FSD) function and the appropriate base stations for both forward-link data and reverse-link data. In particular, for the forward direction, the FSD function transmits forward-link data only to one base station (i.e., the primary base station), which is solely responsible for controlling the forward-link air interface with the corresponding mobile unit. As such, the forward link always operates in simplex mode for data transmissions, independent of how many base stations are operating in soft handoff for the reverse link with the same mobile unit. For the reverse direction, each base station that receives frames of reverse-link data from the mobile unit, assigns a time tag to the frame, divides the frame into one or more data packets, assigns a different sequence number to each data packet, and transmits the data packets to the FSD function over the back haul, all without first synchronizing time with any other base station that is also operating in reverse-link soft hand-off with that mobile unit. The FSD function (or preferably the radio link protocol (RLP) function) is then responsible for selecting packets of reverse-link data for subsequent processing (e.g., transmission to the network end of the connection). By limiting forward-link data transmissions to simplex mode and using packet-mode transmissions for reverse-link data, the need to first synchronize timing between the various base stations is eliminated for both forward-link and reverse-link data transmissions. As a result, reactivation delays are greatly reduced.
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公开(公告)号：CA2199763C
公开(公告)日：2000-10-17
申请号：CA2199763
申请日：1997-03-12
Applicant: LUCENT TECHNOLOGIES INC
Inventor： SAWKAR ANIL S , TREVENTI PHILIP ANDREW , DOSHI BHARAT TARACHAND , DRAVIDA SUBRAHMANYAM , EJZAK RICHARD PAUL , NANDA SANJIV
Abstract: Four stages of digital cellular architecture are presented which reuse much of the existing voice infrastructure while allowing graceful introduction of data and integrated voice/data services over industry standard, low cost platforms. First, a separate ATM-based infrastructure is introduced that supports data services. A new data call control is introduced on industry standard hardware platforms using object oriented and modular programming. Second, ATM is introduced at radio ports and call control functions are migrated to the new ATM-based call control platforms. Third, vocoders are introduced at the DCS. Fourth, the cellular functions of the legacy cellular switch are phased out and replaced by the ATM-based target architecture.
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公开(公告)号：BR9805262A
公开(公告)日：1999-12-28
申请号：BR9805262
申请日：1998-12-10
Applicant: LUCENT TECHNOLOGIES INC
Inventor： KNISELY DOUGLAS , MEYERS MARTIN HOWARD , KUO WEN-YI , NANDA SANJIV
Abstract: Apparatus for reducing power amplifier headroom in a wireless transmission system comprises an orthogonal modulation circuit (32,34) and a phase rotation circuit (70) coupled to the orthogonal modulation circuit. The orthogonal modulation circuit utilizes a Walsh code for modulating an in-phase signal and a quadrature signal. The orthogonal modulation circuit has an in-phase output (SI,K) and a quadrature output (SQ,K). The phase rotation circuit (70) rotates the phase of the in-phase signal and the quadrature signal, producing a phase rotated in-phase signal and a phase rotated quadrature signal. Multiple Walsh code defined channels are associated with a particular wireless user.
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115.发明专利
公开(公告)号：AU2906599A
公开(公告)日：1999-12-02
申请号：AU2906599
申请日：1999-05-17
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BALACHANDRAN KRISHNA , WAUNG WILLIAM , VITEBSKIY SATNISLAV , SETH SHIV MOHAN , NANDA SANJIV , EJZAK RICHARD PAUL
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Patent Agency Ranking
公开(公告)号：CA2272185A1
公开(公告)日：1999-11-17
申请号：CA2272185
申请日：1999-05-17
Applicant: LUCENT TECHNOLOGIES INC
Inventor： NANDA SANJIV , BALACHANDRAN KRISHNA , EJZAK RICHARD PAUL , WAUNG WILLIAM , VITEBSKIY STANISLAV , SETH SHIV MOHAN
Abstract: A system and method of implementing a radio link protocol completion oriented packet data communication system. A data backlog is described with a media access control layer controller and transmitting a BEGIN protocol data unit containing a flag transmitted to a receiver. A media access control layer transaction is initiated in response to the transmitting of the BEGIN protocol data unit.
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公开(公告)号：CA2244428A1
公开(公告)日：1999-02-24
申请号：CA2244428
申请日：1998-07-30
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BALACHANDRAN KRISHNA , KADABA SRINIVAS R , EJZAK RICHARD PAUL , NANDA SANJIV
IPC: H04L27/00 , H03M13/23 , H04B7/26 , H04B17/00 , H04L1/00 , H04L1/12 , H04L1/20 , H04L27/18 , H04L27/34 , H04W36/30 , H04W72/08 , H04Q7/34
Abstract: A system and method to measure channel quality in terms of signal to noise ratio for the transmission of coded signals over fading channels. A Viterbi deco der metric for the Maximum Likelihood path is used as a channel quality measure. Thi s Euclidean distance metric is filtered in order to smooth out short term variatio ns. The filtered or averaged metric is a reliable channel quality measure which rema ins consistent across different coded modulation schemes and at different mobile speeds. The filtered metric is mapped to the signal to noise ratio per symbol us ing a threshold based scheme. Use of this implicit signal to noise ratio estimate is u sed for the mobile assisted handoff and data rate adaptation in the transmitter.
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公开(公告)号：MX9702520A
公开(公告)日：1997-10-31
申请号：MX9702520
申请日：1997-04-07
Applicant: LUCENT TECHNOLOGIES INC
Inventor： DOSHI BHARAT TERACHAND , DRAVIDA SUBRAHMANYAM , EJZAK RICHARD PAUL , NANDA SANJIV , SAWKAR ANIL , TREVENTI PHILIP ANDREW
Abstract: Cuatro etapas de arquitectura celular digital se presentan que reutilizan gran parte de la infraestructura de voz existente mientras que permite introduccion elegante de datos de servicio integrados de voz/datos sobre plataformas de bajo costo estándar en la industria. Primero, se introduce una infraestructura basada en ATM separada que soporta servicios de datos. Se introduce un nuevo control de llamada de datos en plataformas de equipo físico estándar industrial, utilizando programacion modular y orientada de objetos. En segundo, ATM se introduce en puertos de radio y funciones de control de llamada se migran a las nuevas plataformas de control de llamada basadas en ATM. En tercer lugar, se introducen codificadores de voz en DCS. En cuarto lugar, las funciones celulares del conmutador celular legacy se separan en fase y reemplazan por la arquitectura objetivo basada en ATM.
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公开(公告)号：CA2286470A1
公开(公告)日：1997-10-10
申请号：CA2286470
申请日：1997-03-12
Applicant: LUCENT TECHNOLOGIES INC
Inventor： TREVENTI PHILIP ANDREW , DOSHI BHARAT TARACHAND , NANDA SANJIV , SAWKAR ANIL S , DRAVIDA SUBRAHMANYAM , EJZAK RICHARD PAUL
Abstract: The present invention relates to a cellular communication system that is comprised of a plurality of base stations and radio ports that communicate over an air interface with a plurality of terminal devices, where the radio ports have asynchronous transfer mode (ATM) interfaces. A cellular switch is provided having circuit-switching fabric and vocoders, where the base stations are connected to the circuit-switching fabric by first communications links, and where the circuit-switching fabric is also connected to a public switched telephone network (PSTN). A cellular call control processor is associated with the cellular switch, that handles a voice call routed through the cellular switch. A digital cellular switch (DCS) having ATM fabric and radio link protocol processors is also provided, where the circuit switching fabric is connected to the ATM fabric by a second communications link via a converter that converts between the transmission format of the first communications links and ATM, the ATM fabric being connected to the radio ports by ATM virtual links. One or more standard hardware platforms implement ATM transport that perform a plurality of call control functions including the handling of data calls from/to the base stations and radio ports. A network interworking module interfaces the DCS to a communications network.
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公开(公告)号：CA2286466A1
公开(公告)日：1997-10-10
申请号：CA2286466
申请日：1997-03-12
Applicant: LUCENT TECHNOLOGIES INC
Inventor： DRAVIDA SUBRAHMANYAM , EJZAK RICHARD PAUL , TREVENTI PHILIP ANDREW , NANDA SANJIV , SAWKAR ANIL S , DOSHI BHARAT TARACHAND
Abstract: Four stages of digital cellular architecture are presented which reuse much of the existing voice infrastructure while allowing graceful introduction of data and integrated voice/data services over industry standard, low cost platforms. First, a separate ATM-based infrastructure (46) is introduced that supports data services. A new data call control is introduced on industry standard hardware platforms using object oriented and modular programming. Second, ATM is introduced at radio ports (68) and call control functions are migrated to the new ATM-based call control platforms (72, 74). Third, vocoders (76) are introduced at the DCS. Fourth, the cellular functions of the legacy cellular switch (10) are phased out and replaced by the ATM-based target architecture.
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