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公开(公告)号:ES2580081T3
公开(公告)日:2016-08-19
申请号:ES06014173
申请日:2001-03-20
Applicant: QUALCOMM INC
Inventor: WALTON JAY R , WALLACE MARK S , JALALI AHMAD
IPC: H04B7/04 , H04B1/707 , H04J11/00 , H04B7/06 , H04B7/08 , H04B7/12 , H04B7/26 , H04B17/00 , H04J99/00 , H04L1/00 , H04L5/00 , H04L25/02 , H04L25/03 , H04L27/26 , H04W52/08 , H04W52/42
Abstract: Un aparato para medir y notificar características de transmisión de un canal de propagación en un sistema de comunicación de entrada múltiple/salida múltiple (100), que comprende: medios para recibir, por una pluralidad de antenas de recepción (122A-122R), símbolos piloto en al menos algunos de los subcanales de una pluralidad de subconjuntos de subcanales de una pluralidad respectiva de antenas transmisoras (116A-116T) de una unidad de transmisión, en el que los subconjuntos de subcanal son disjuntos; medios para distinguir diferentes respuestas de canal de diferentes patrones de antena de transmisiónrecepción mediante la determinación de un conjunto de características de transmisión para al menos uno de la pluralidad de subcanales, en el que determinar el conjunto de características de transmisión utiliza los símbolos piloto recibidos en las antenas de recepción (122A-122R); y medios para notificar una señal de información a la unidad transmisora, en el que la señal de información lleva el conjunto de características de transmisión para al menos uno de la pluralidad de subcanales.
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公开(公告)号:BR0109693B1
公开(公告)日:2015-01-20
申请号:BR0109693
申请日:2001-03-20
Applicant: QUALCOMM INC
Inventor: WALLACE MARK , WALTON JAY R , JALALI AHMAD
IPC: H04B7/06 , H04J11/00 , H04B1/707 , H04B7/04 , H04B7/08 , H04B7/12 , H04B7/26 , H04B17/00 , H04J99/00 , H04L5/00 , H04L25/02 , H04L27/26 , H04W52/08 , H04W52/42
Abstract: The invention relates to a method for transmitting pilot signals used for measuring and reporting channel state information, CSI, in a multiple input/multiple output, MIMO, system, comprising: generating a pilot sequence by using a maximal-length shift register sequence, m-sequence; assigning a different shift to multiple transmit antennas, wherein the value of the shift is dependent on at least one characteristic of the communication channel; generating a pilot signal at each transmit antenna by shifting the pilot sequence by the value specified by the shift; and transmitting the pilot signal via the transmit antenna.
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43.
公开(公告)号:CA2402152C
公开(公告)日:2012-05-22
申请号:CA2402152
申请日:2001-03-20
Applicant: QUALCOMM INC
Inventor: WALLACE MARK , WALTON JAY R , JALALI AHMAD
IPC: H04B7/04 , H04J11/00 , H04B1/707 , H04B7/005 , H04B7/06 , H04B7/08 , H04B7/12 , H04B7/26 , H04B17/00 , H04J99/00 , H04L25/02 , H04L27/26 , H04W52/08 , H04W52/42
Abstract: Channel state information (CSI) can be used by a communications system to precondition transmissions between transmitter units and receiver units. In one aspect of the invention, disjoint sub-channel sets are assigned to transmit antennas located at a transmitter unit. Pilot symbols are generated and transmitted on a subset of the disjoint sub-channels. Upon receipt of the transmitted pilot symbols, the receiver units determine the CSI for the disjoint sub-channels that carried pilot symbols. These CSI values are reported to the transmitter unit, which will use these CSI values to generate CSI estimates for the disjoint sub-channels that did not carry pilot symbols. The amount of information necessary to report CSI on the reverse link can be further minimized through compression techniques and resource allocation techniques.
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公开(公告)号:DE60131280T2
公开(公告)日:2008-08-28
申请号:DE60131280
申请日:2001-06-18
Applicant: QUALCOMM INC
Inventor: PADOVANI ROBERTO , BENDER PAUL E , JALALI AHMAD , JUDSON BRUCE , WHEATLEY CHARLES E
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公开(公告)号:NZ546101A
公开(公告)日:2008-02-29
申请号:NZ54610104
申请日:2004-09-21
Applicant: QUALCOMM INC
Inventor: JALALI AHMAD
IPC: H04J11/00 , H04J13/00 , H04J13/18 , H04L12/24 , H04L12/56 , H04W28/14 , H04W28/22 , H04W28/26 , H04W72/02 , H04W74/08 , H04W84/06
Abstract: In a code division multiple access (CDMA) communications system, which includes plural terminals that communicate with a node via at least a random access channel and a reservation-oriented channel, a method of managing traffic on the random access and reservation-oriented channels is disclosed. The method comprises: a) comparing, to at least one criterion, characteristics of traffic in which data is communicated from a given terminal; and b) if the traffic characteristics satisfy the at least one criterion: 1) sending a bandwidth reservation request; 2) processing and granting the bandwidth reservation request; 3) communicating the granting of the bandwidth reservation request to the given terminal; and 4) causing the given terminal to transmit data on the reservation-oriented channel; or c) if the traffic characteristics fail the at least one criterion, causing the given terminal to transmit data on the random access channel.
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公开(公告)号:BRPI0508583A
公开(公告)日:2007-08-21
申请号:BRPI0508583
申请日:2005-03-08
Applicant: QUALCOMM INC
Inventor: FERNANDEZ-CORBATON IVAN JESUS , ANTONIO FRANKLIN PETER , SCHIFF LEONARD NORMAN , JALALI AHMAD
Abstract: Systems, methods and apparatus for configuring and accessing a random access channel in a CDMA communication system are disclosed. The number of users supported by a random access channel can be optimized by assigning a distinct time of arrival to each of a plurality of users. Each of the users can be time synchronized and can transmit data at a time that compensates for a propagation delay to allow the data to arrive at the destination receiver at the assigned time. In a CDMA system, each of the users can transmit data that is spread with the same spreading code, provided the cross correlation properties of the code are sufficient to allow identification of a source that is time offset relative to another user. The time of arrival can be determined based on the number of active users, and can be assigned as often as each transmission by each user.
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公开(公告)号:BRPI0414731A
公开(公告)日:2006-11-21
申请号:BRPI0414731
申请日:2004-09-21
Applicant: QUALCOMM INC
Inventor: JALALI AHMAD
IPC: H04J11/00 , H04J13/00 , H04J13/18 , H04L12/24 , H04L12/56 , H04W28/14 , H04W28/22 , H04W28/26 , H04W72/02 , H04W74/08 , H04W84/06
Abstract: In a code division multiple access (CDMA) communications system including one or more terminals (such as customer premise equipments, CPEs) that communicate with a node (such as an Internet gateway) via at least a random access channel and a reservation-oriented channel, various schemes of managing communications traffic among the channels are provided. Decisions as to the channel on which a given terminal may transmit may be based on: traffic statistics (such as packet size or average data rate over a time period), traffic content (such as packet type), the terminal's output buffer loading (queue state, or “Q-state”), a history of the terminal's output buffer loading (one or more Q-states), and so forth. In one application, decisions in managing traffic in a live user's web browsing sessions may involve intelligent ascertainment of whether a given terminal is busy based on traffic analysis or output buffer loading.
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48.
公开(公告)号:MXPA06003327A
公开(公告)日:2006-06-08
申请号:MXPA06003327
申请日:2004-09-21
Applicant: QUALCOMM INC
Inventor: JALALI AHMAD
IPC: H04J11/00 , H04L12/56 , H04J13/00 , H04J13/18 , H04L12/24 , H04W28/14 , H04W28/22 , H04W28/26 , H04W72/02 , H04W74/08 , H04W84/06
Abstract: En un sistema de comunicaciones de acceso multiple por division de codigo (CDMA -code division multiple access) que incluye una o mas terminales (tal como equipos de premisa de cliente, CPEs) que se comunican con un nodo (tal como un acceso de red de Internet) mediante al menos un canal de acceso aleatorio y un canal orientado a reservaciones, se proporcionan diversos esquemas para administrar el trafico de las comunicaciones entre los canales. Las decisiones referentes al canal por el cual puede transmitir una determinada terminal pueden basarse en: estadisticas de trafico (tal como el tamano de paquete o la tasa de datos promedio durante un periodo de tiempo), contenido de trafico (tal como tipo de paquete), la carga de memoria temporal de salida de la terminal (estado de cola, o "estado Q"), un historial de la carga de memoria temporal de salida de la terminal (uno o mas estados Q), etcetera. En una aplicacion, las decisiones para administrar el trafico en sesiones en vivo de navegacion de web del usuario pueden involucrar una determinacion inteligente sobre si una determinada terminal se encuentra ocupada con base en el analisis de trafico o la carga de memoria temporal de salida.
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公开(公告)号:BR0214310A
公开(公告)日:2006-05-23
申请号:BR0214310
申请日:2002-11-20
Applicant: QUALCOMM INC
Inventor: JALALI AHMAD , FERNANDEZ-CORBATON IVAN
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公开(公告)号:BR0111796A
公开(公告)日:2006-05-09
申请号:BR0111796
申请日:2001-06-18
Applicant: QUALCOMM INC
Inventor: PADOVANI ROBERTO , BENDER PAUL E , JALALI AHMAD , JUDSON BRUCE , WHEATLEY CHARLES E III
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