公开(公告)号：MXPA06006013A

公开(公告)日：2007-01-26

申请号：MXPA06006013

申请日：2004-11-15

Applicant: QUALCOMM INC

Inventor： KETCHUM JOHN W ,  WALTON J RODNEY

IPC: H04L12/00 ,  H04B7/00 ,  H04B7/06 ,  H04B7/26 ,  H04L1/00 ,  H04L1/06 ,  H04L1/16 ,  H04L12/28 ,  H04L12/56 ,  H04L25/02 ,  H04L27/00 ,  H04L27/26 ,  H04W28/18 ,  H04W36/00 ,  H04W72/14

Abstract: De acuerdo a un aspecto de la invencion, se proporciona un metodo en el cual un canal de control usado para transmitir informacion de control se reparte en una pluralidad de subcanales cada uno de los cuales es operado a una velocidad de datos especifica. Por cada una de una o mas terminales de usuario, es seleccionado uno de los subcanales sobre la base de uno o mas criterios de seleccion para transmitir informacion de control de un punto de acceso a la terminal de usuario respectiva. La informacion de control es transmitida del punto de acceso a una terminal de usuario sobre un subcanal particular seleccionado por la terminal de usuario respectiva. En la terminal de usuario, uno o mas subcanales son descodificados para obtener informacion de control designada por la terminal de usuario.

公开(公告)号：CA2731263A1

公开(公告)日：2006-05-26

申请号：CA2731263

申请日：2005-11-15

Applicant: QUALCOMM INC

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

IPC: H04W28/22 ,  H04J99/00

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.

公开(公告)号：CA2547000A1

公开(公告)日：2005-06-16

申请号：CA2547000

申请日：2004-11-24

Applicant: QUALCOMM INC

Inventor： NANDA SANJIV ,  WALTON J RODNEY

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

Abstract: In one aspect of the invention, a communication device, operable with a plurality of remote devices, and operable with an admission profile comprisi ng a capacity reservation for zero or more remote devices, comprises a schedule r 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 accordanc e with available system capacity.

公开(公告)号：CA2787797A1

公开(公告)日：2005-06-09

申请号：CA2787797

申请日：2004-11-12

Applicant: QUALCOMM INC

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

IPC: H04W74/04 ,  H04B7/02 ,  H04B7/06 ,  H04J11/00 ,  H04J99/00 ,  H04L5/02 ,  H04Q7/36 ,  H04W24/00

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：AU2004306916A1

公开(公告)日：2005-04-28

申请号：AU2004306916

申请日：2004-10-15

Applicant: QUALCOMM INC

Inventor： NANDA SANJIV ,  WALTON J RODNEY

IPC: H04L12/66 ,  H04B7/005 ,  H04L12/28 ,  H04L12/56 ,  H04L29/06 ,  H04L29/08 ,  H04W52/38 ,  H04W72/04 ,  H04W72/12

Abstract: Techniques for MAC processing for efficient use of high throughput systems that may be backward compatible with various types of legacy systems are disclosed. In one aspect, a data frame is formed comprising a common portion for transmission in a format receivable by various stations, such as access points and remote stations. The data frame also comprises a dedicated portion, formatted for transmission to a specified remote station. In another aspect, the common portion is unsteered, and the dedicated portion is steered. In another aspect, an access point schedules an allocation in response to a data indication included in a common portion of a data frame transmitted from one remote station to another. In another aspect, a first station transmits a reference to a second station, which measures the reference and generates feedback therefrom.

公开(公告)号：CA2844937C

公开(公告)日：2015-02-10

申请号：CA2844937

申请日：2007-05-22

Applicant: QUALCOMM INC

Inventor： WALTON J RODNEY ,  WALLACE MARK S ,  MEDVEDEV IRINA ,  HOWARD STEVEN J

IPC: H04B7/01 ,  H04B1/76 ,  H04W56/00

Abstract: Techniques for performing phase correction for wireless communication are described. Received pilot symbols and received data symbols may be obtained from an orthogonal frequency division multiplexing (OFDM) and/or multiple-input multiple-output (MIMO) transmission. First phase information is obtained based upon the received pilot symbols. Second phase information is obtained based upon the received data symbols. The phase of the received data symbols is corrected based upon the first and second phase information (directly and/or indirectly). For example, the phase of the received data symbols may be corrected based upon the first phase information, detection may be performed on the phase corrected data symbols to obtain estimated data symbols, the second phase information may be obtained based upon the estimated data symbols, and the phase of the estimated data symbols may be corrected based upon the second phase information. The phase correction may also be performed in other manners.

公开(公告)号：CA2810036C

公开(公告)日：2014-09-02

申请号：CA2810036

申请日：2003-10-24

Applicant: QUALCOMM INC

Inventor： WALTON J RODNEY ,  KETCHUM JOHN W ,  WALLACE MARK S ,  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 ,  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：ES2427145T3

公开(公告)日：2013-10-29

申请号：ES04795423

申请日：2004-10-15

Applicant: QUALCOMM INC

Inventor： WALTON J RODNEY ,  NANDA SANJIV

IPC: H04L12/66 ,  H04B7/005 ,  H04L12/28 ,  H04L12/56 ,  H04L29/06 ,  H04L29/08 ,  H04W52/38 ,  H04W72/04 ,  H04W72/12

Abstract: Un aparato, que comprende: medios para transmitir una trama (1020) desde una primera estación hasta una segunda estación, caracterizado por que la trama comprende: una parte común (2110; 2120), transmitida según un primer formato que puede recibirse en una o más terceras estaciones; y una parte dedicada (2130), transmitida según un segundo formato seleccionado para poder recibirse en la segunda estación.

公开(公告)号：CA2787842C

公开(公告)日：2013-08-20

申请号：CA2787842

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: H04B7/02 ,  H04B7/06 ,  H04J11/00 ,  H04J99/00 ,  H04L5/02 ,  H04Q7/36

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：CA2500849C

公开(公告)日：2012-10-02

申请号：CA2500849

申请日：2003-10-24

Applicant: QUALCOMM INC

Inventor： WALTON J RODNEY ,  WALLACE MARK S

IPC: H04W28/04 ,  H04B7/005 ,  H04B7/06 ,  H04B7/08 ,  H04J99/00 ,  H04L1/00 ,  H04L1/06 ,  H04L1/08 ,  H04L1/16 ,  H04L25/02 ,  H04L25/03 ,  H04L27/00 ,  H04L27/26 ,  H04W16/10 ,  H04W28/20 ,  H04W52/50 ,  H04W84/12 ,  H04W88/02

Abstract: Techniques for detecting and demodulating data transmissions in wireless communication systems. In one aspect, a decision-directed detector detects for data transmissions in a received signal by utilizing received data symbols as well as received pilot symbols. The decision-directed detector may be designed to perform differential detection in the frequency domain or coherent detection in the time domain, and may be used with multi-carrier modulation (e.g., OFDM). In another aspect, an adaptive threshold is used to perform detection of received data transmissions. A threshold may be determined for each data transmission hypothesized to have been received. The threshold may be computed, for example, based on the signal plus noise energy of the hypothesized data transmission.