公开(公告)号：WO2006055646A3

公开(公告)日：2006-09-14

申请号：PCT/US2005041556

申请日：2005-11-15

Applicant: QUALCOMM INC ,  WALTON J RODNEY ,  SURINENI SHRAVAN K ,  MEYLAN ARNAUD ,  NANDA SANJIV

Inventor： WALTON J RODNEY ,  SURINENI SHRAVAN K ,  MEYLAN ARNAUD ,  NANDA SANJIV

IPC: H04B17/00 ,  H04J99/00 ,  H04L1/00

CPC classification number: H04L1/0015 ,  H04B17/309 ,  H04L1/0002 ,  H04L1/1607 ,  Y02D50/10

Abstract: Techniques for performing open-loop rate control in a TDD communication system are described. The channel quality of a first link is estimated based on a transmission received via the first link. The channel quality of a second link is estimated based on the estimated channel quality of the first link and an asymmetric parameter. At least one rate for a data transmission via the second link is selected based on the estimated channel quality of the second link. The estimated channel quality for each link may be given by a set of SNR estimates for a set of transmission channels on that link. The asymmetric parameter may be determined based on (1) the capabilities (e.g., transmit power, receiver noise figure, and number of antennas) of the transmitting and receiving stations or (2) received SNRs for the first and second links.

Abstract translation: 描述了用于在TDD通信系统中执行开环速率控制的技术。 基于经由第一链路接收的传输来估计第一链路的信道质量。 基于估计的第一链路的信道质量和非对称参数来估计第二链路的信道质量。 基于估计的第二链路的信道质量来选择用于经由第二链路的数据传输的至少一个速率。 每个链路的估计信道质量可以由该链路上的一组传输信道的一组SNR估计给出。 可基于（1）发射和接收站的能力（例如，发射功率，接收器噪声系数和天线数目）或（2）第一和第二链路的接收SNR来确定非对称参数。

公开(公告)号：CA2501398C

公开(公告)日：2015-10-27

申请号：CA2501398

申请日：2003-10-24

Applicant: QUALCOMM INC

Inventor： WALTON J RODNEY ,  KETCHUM JOHN W ,  WALLACE MARK ,  HOWARD STEVEN J

IPC: H04W74/08 ,  H04B7/005 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04J99/00 ,  H04L1/00 ,  H04L1/06 ,  H04L1/08 ,  H04L1/16 ,  H04L12/28 ,  H04L12/56 ,  H04L25/02 ,  H04L25/03 ,  H04L27/26 ,  H04W16/10 ,  H04W24/00 ,  H04W28/04 ,  H04W28/20 ,  H04W52/50

Abstract: Techniques for facilitating random access in wireless multiple-access communication systems. A random access channel (RACH) is defined to comprise a "fast" RACH (F-RACH) and a "slow" RACH (S-RACH). The F-RACH and S-RACH can efficiently support user terminals in different operating states and employ different designs. The F-RACH can be used to quickly access the system, and the S-RACH is more robust and can support user terminals in various operating states and conditions. The F-RACH may be used by user terminals that have registered with the system and can compensate for their round trip delays (RTDs) by properly advancing their transmit timing. The S-RACH may be used by user terminals that may or may not have registered with the system, and may or may not be able to compensate for their RTDs. The user terminals may use the F-RACH or S-RACH, or both, to gain access to the system.

公开(公告)号：ES2525141T3

公开(公告)日：2014-12-18

申请号：ES10011027

申请日：2004-08-17

Applicant: QUALCOMM INC

Inventor： WALTON J RODNEY ,  KETCHUM JOHN W ,  HOWARD STEVEN J ,  WALLACE MARK S

IPC: H04J99/00 ,  H04L1/06 ,  H04B7/04 ,  H04B7/06 ,  H04L1/00 ,  H04L25/02 ,  H04L27/26

Abstract: Un procedimiento de comunicaciones inalámbricas en un sistema de MIMO, que comprende: obtener una pluralidad de matrices (1112) de respuesta de canal para una respuesta de canal de un canal de MIMO, en donde la pluralidad de matrices de respuesta de canal comprenden una pluralidad de matrices de respuesta de impulso de canal para una pluralidad de retardos temporales, o una pluralidad de matrices de respuesta de frecuencia de canal para una pluralidad de sub-bandas; obtener, en una entidad receptora, al menos un vector de guía, a ser usado por una entidad transmisora para el procesamiento espacial independiente de la frecuencia de al menos un flujo de datos enviado por al menos un canal espacial asociado a dicho al menos un vector (674, 680, 1022, 1116) de guía; obtener un filtro correlacionado para cada una entre una pluralidad de antenas de recepción en la entidad receptora, en base a dicho al menos un vector de guía y a una pluralidad de vectores de respuesta estimada de canal para esa antena de recepción, en el que los vectores de respuesta de canal para cada antena de recepción son obtenidos a partir de las matrices (1132, 1232, 674, 680, 1022) de respuesta de canal; filtrar una pluralidad de flujos de símbolos recibidos para la pluralidad de antenas de recepción, con la pluralidad de filtros correlacionados, para obtener una pluralidad de flujos (1134, 1234, 910, 930, 940, 950, 980) de símbolos filtrados; y combinar la pluralidad de flujos de símbolos filtrados para obtener al menos un flujo de símbolos detectados para dicho al menos un flujo de datos enviado por la entidad transmisora (1136, 1236, 912, 932, 942, 952, 982).

公开(公告)号：ES2478541T3

公开(公告)日：2014-07-22

申请号：ES12166158

申请日：2010-10-06

Applicant: QUALCOMM INC

Inventor： WALTON J RODNEY ,  KETCHUM JOHN W ,  MICHAELIS OLIVER

IPC: H04L29/08 ,  H04W40/24

Abstract: Un procedimiento para comunicaciones inalámbricas por un nodo inalámbrico en una red inalámbrica entre iguales, P2P, que comprende: generar un valor de la métrica de conectividad, CM, indicativo de un número de otros nodos inalámbricos de la red inalámbrica P2P a la que el nodo inalámbrico está conectado; transmitir (402) el valor de CM; y que se caracteriza por: transmitir la información de conectividad completa mantenida por el nodo inalámbrico a una frecuencia determinada sobre la base del valor de CM.

公开(公告)号：CA2502804C

公开(公告)日：2014-02-11

申请号：CA2502804

申请日：2003-10-24

Applicant: QUALCOMM INC

Inventor： KETCHUM JOHN W ,  WALLACE MARK S ,  WALTON J RODNEY ,  HOWARD STEVEN J

IPC: H04W72/04 ,  H04B7/005 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04J3/00 ,  H04J99/00 ,  H04L1/00 ,  H04L1/06 ,  H04L1/08 ,  H04L1/16 ,  H04L12/28 ,  H04L12/56 ,  H04L25/02 ,  H04L25/03 ,  H04L27/26 ,  H04W16/10 ,  H04W16/28 ,  H04W52/50

Abstract: Channel estimation and spatial processing for a TDD MIMO system. Calibration may be performed to account for differences in the responses of transmit/ receive chains at the access point and user terminal (512). During normal operation, a MIMO pilot is transmitted on a first link (522) and used to derive an estimate of the first link channel response (524), which is decomposed to obtain a diagonal matrix of singular values and a first unitary matrix containing both left eigenvectors of the first link and right eigenvectors of a second link (526). A steered reference is transmitted on the second link using the eigenvectors in the first unitary matrix (530), and is processed to obtain the diagonal matrix and a second unitary matrix containing both left eigenvectors of the second link and right eigenvectors of the first link (532). Each unitary matrix may be used to perform spatial processing for data transmission/reception via both links (540, 542, 550, 552).

公开(公告)号：CA2547000C

公开(公告)日：2014-01-28

申请号：CA2547000

申请日：2004-11-24

Applicant: QUALCOMM INC

Inventor： WALTON J RODNEY ,  NANDA SANJIV

IPC: H04L12/28 ,  H04L12/56 ,  H04L47/20 ,  H04L47/2475 ,  H04L47/30 ,  H04L47/56 ,  H04L47/6275 ,  H04L47/765 ,  H04L47/80 ,  H04W8/18 ,  H04W28/08 ,  H04W28/18 ,  H04W28/24 ,  H04W28/26 ,  H04W72/04 ,  H04W72/12 ,  H04W72/14

Abstract: In one aspect of the invention, a communication device, operable with a plurality of remote devices, and operable with an admission profile comprising a capacity reservation for zero or more remote devices, comprises a scheduler for determining if a remote device corresponding to the data transmission indicator has a capacity reservation in the admission profile and for allocating capacity in accordance with the data transmission indicator. In another aspect, data indicators correspond to one or more service levels. Remaining capacity may be allocated in priority of increasing size of data transmission requirement. In yet another aspect, an admission profile is updated to accept a new flow, characterized by flow parameters, in accordance with available system capacity.

公开(公告)号：CA2596092C

公开(公告)日：2013-07-30

申请号：CA2596092

申请日：2006-01-27

Applicant: QUALCOMM INC

Inventor： WALLACE MARK S ,  KETCHUM JOHN W ,  WALTON J RODNEY ,  HOWARD STEVEN J

IPC: H04B7/005 ,  H04J99/00 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04L1/00 ,  H04L1/06 ,  H04L1/08 ,  H04L1/16 ,  H04L5/14 ,  H04L12/28 ,  H04L12/56 ,  H04L25/02 ,  H04L25/03 ,  H04L27/26

Abstract: Techniques are described to calibrate the downlink and uplink channels to account for differences in the frequency responses of the transmit and receive chains at an access point and a user terminal. In one method, pilots are transmitted on the downlink and uplink channels and used to derive estimates of the downlink and uplink channel responses, respectively. Correction factors for the access point and correction factors for the user terminal are determined based on (e.g., by performing matrix-ratio computation or minimum mean square error (MMSE) computation on) the downlink and uplink channel response estimates. The correction factors for the access point and the correction factors for the user terminal are used to obtain a calibrated downlink channel and a calibrated uplink channel, which are transpose of one another. The calibration may be performed in real time based on over-the-air transmission.

公开(公告)号：CA2546749C

公开(公告)日：2012-10-23

申请号：CA2546749

申请日：2004-11-12

Applicant: QUALCOMM INC

Inventor： WALTON J RODNEY ,  KETCHUM JOHN W ,  SMEE JOHN EDWARD ,  WALLACE MARK S ,  HOWARD STEVEN J

IPC: H04B7/04 ,  H04B7/06 ,  H04J11/00 ,  H04J99/00 ,  H04L5/02 ,  H04Q7/36 ,  H04W16/10

Abstract: An uplink channel response matrix is obtained for each terminal and decomposed to obtain a steering vector used by the terminal to transmit on the uplink. An "effective" uplink channel response vector is formed for each terminal based on its steering vector and its channel response matrix. Multiple sets of terminals are evaluated based on their effective channel response vectors to determine the best set (e.g., with highest overall throughput) for uplink transmission. Each selected terminal performs spatial processing on its data symbol stream with its steering vector and transmits its spatially processed data symbol stream to an access point. The multiple selected terminals simultaneously transmit their data symbol streams via their respective MIMO channels to the access point. The access point performs receiver spatial processing on its received symbol streams in accordance with a receiver spatial processing technique to recover the data symbol streams transmitted by the selected terminals.

公开(公告)号：HK1150709A1

公开(公告)日：2012-01-06

申请号：HK11104643

申请日：2006-04-10

Applicant: QUALCOMM INC

Inventor： WALTON J RODNEY ,  KETCHUM JOHN W ,  WALLACE MARK ,  HOWARD STEVEN J

IPC: H04L20060101 ,  H04B7/005 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04J99/00 ,  H04L1/00 ,  H04L1/06 ,  H04L1/08 ,  H04L1/16 ,  H04L12/28 ,  H04L12/56 ,  H04L25/02 ,  H04L25/03 ,  H04L27/26 ,  H04W28/20 ,  H04W52/50 ,  H04W74/08

Abstract: Techniques for facilitating random access in wireless multiple-access communication systems. A random access channel (RACH) is defined to comprise a "fast" RACH (F-RACH) and a "slow" RACH (S-RACH). The F-RACH and S-RACH can efficiently support user terminals in different operating states and employ different designs. The F-RACH can be used to quickly access the system, and the S-RACH is more robust and can support user terminals in various operating states and conditions. The F-RACH may be used by user terminals that have registered with the system and can compensate for their round trip delays (RTDs) by properly advancing their transmit timing. The S-RACH may be used by user terminals that may or may not have registered with the system, and may or may not be able to compensate for their RTDs. The user terminals may use the F-RACH or S-RACH, or both, to gain access to the system.

公开(公告)号：SG172634A1

公开(公告)日：2011-07-28

申请号：SG2011037934

申请日：2007-05-30

Applicant: QUALCOMM INC

Inventor： SURINENI SHRAVAN K ,  WALTON J RODNEY ,  WALLACE MARK ,  HOWARD STEVEN J

Abstract: METHOD AND APPARATUS FOR PROVIDING BEAMFORMING FEEDBACK IN WIRELESS COMMUNICATION SYSTEMS Techniques for quickly sending feedback information for beamforming are described. A transmitter/initiator sends a first frame comprising training symbols. A receiver/responder receives the first frame, determines the amount of time to generate feedback information, and determines the amount of time to send the feedback information. The receiver then determines the length of a second frame carrying the feedback information based on the amounts of time to generate and send the feedback information. The receiver sends the second frame after waiting a short interframe space (SIFS) period from the end of the first frame, without performing channel access. The receiver generates the feedback information based on the training symbols and sends the information in the second frame when ready. The transmitter receives the second frame, derives at least one steering matrix based on the feedback information, and sends a third frame with the at least one steering matrix. Figure 2