公开(公告)号：UA90080C2

公开(公告)日：2010-04-12

申请号：UA2005004936

申请日：2003-10-24

Applicant: QUALCOMM INC

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

IPC: H04L12/28 ,  H04L1/00 ,  H04L1/06 ,  H04W88/00

Abstract: Раскрытыспособыдляоблегченияпроизвольногодоступав беспроводныхкоммуникационныхсистемахс произвольнымдоступом. Каналпроизвольногодоступа (RACH) определяюткакобразованный «быстрым» каналомпроизвольногодоступа (F-RACH) и «медленным» каналомпроизвольногодоступа (S-RACH). F-RACH и S-RACH могутэффективноподдерживатьтерминалыпользователяв разныхоперационныхсостояниях, которыеимеютразныеконструкции. F-RACH можетбытьиспользовандлябыстрогодоступав систему, а S-RACH являетсяболеенадежными можетподдерживатьтерминалыпользователяв разныхоперационныхсостоянияхи условиях. F-RACH можетбытьиспользовантерминаламипользователя, которыезарегистрированыв системеи могуткомпенсироватьихзадержкиприпрохождениив обаконца (RTD) спомощьюсоответствующегоизменениятаймированияихпередачи. S-RACH можетбытьиспользовантерминаламипользователя, которыемогутбытьзарегистрированыилинезарегистрированыв системеи могутбытьспособныилинемогутбытьспособныкомпенсироватьих RTD. Терминалыпользователямогутиспользоватьдляполучениядоступав систему F-RACH или S-RACH илиобаканала.

公开(公告)号：AU2003287291B2

公开(公告)日：2009-12-24

申请号：AU2003287291

申请日：2003-10-24

Applicant: QUALCOMM INC

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

IPC: H04L12/28 ,  H04B7/005 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04J99/00 ,  H04L1/00 ,  H04L1/06 ,  H04L1/08 ,  H04L1/16 ,  H04L1/18 ,  H04L12/56 ,  H04L25/02 ,  H04L25/03 ,  H04L27/00 ,  H04L27/26 ,  H04W28/06 ,  H04W28/20 ,  H04W28/22 ,  H04W52/00 ,  H04W52/42 ,  H04W52/50 ,  H04W72/04 ,  H04W72/12 ,  H04W74/00 ,  H04W74/08 ,  H04W84/12

Abstract: A multiple-access MIMO WLAN system that employs MIMO, OFDM, and TDD. The system (1) uses a channel structure with a number of configurable transport channels, (2) supports multiple rates and transmission modes, which are configurable based on channel conditions and user terminal capabilities, (3) employs a pilot structure with several types of pilot (e.g., beacon, MIMO, steered reference, and carrier pilots) for different functions, (4) implements rate, timing, and power control loops for proper system operation, and (5) employs random access for system access by the user terminals, fast acknowledgement, and quick resource assignments. Calibration may be performed to account for differences in the frequency responses of transmit/receive chains at the access point and user terminals. The spatial processing may then be simplified by taking advantage of the reciprocal nature of the downlink and uplink and the calibration.

公开(公告)号：AU2003287294B2

公开(公告)日：2009-08-06

申请号：AU2003287294

申请日：2003-10-24

Applicant: QUALCOMM INC

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

IPC: 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：AU2004310960B2

公开(公告)日：2009-05-07

申请号：AU2004310960

申请日：2004-11-15

Applicant: QUALCOMM INC

Inventor： KETCHUM JOHN W ,  WALTON J RODNEY

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

公开(公告)号：AU2003287328B2

公开(公告)日：2009-04-30

申请号：AU2003287328

申请日：2003-10-24

Applicant: QUALCOMM INC

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

IPC: 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 ,  H04W16/28 ,  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. During normal operation, a MIMO pilot is transmitted on a first link and used to derive an estimate of the first link channel response, 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. A steered reference is transmitted on the second link using the eigenvectors in the first unitary matrix, 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. Each unitary matrix may be used to perform spatial processing for data transmission/reception via both links.

公开(公告)号：AU2004306916B2

公开(公告)日：2009-04-09

申请号：AU2004306916

申请日：2004-10-15

Applicant: QUALCOMM INC

Inventor： NANDA SANJIV ,  WALTON J RODNEY

IPC: H04W28/00 ,  H04B7/005 ,  H04L12/28 ,  H04L12/56 ,  H04L12/66 ,  H04L29/06 ,  H04L29/08 ,  H04W52/38 ,  H04W72/04 ,  H04W72/12 ,  H04W84/08

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：ES2293868T1

公开(公告)日：2008-04-01

申请号：ES05815502

申请日：2005-10-20

Applicant: QUALCOMM INC

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

IPC: H04L12/28 ,  H04W16/14 ,  H04W24/00 ,  H04W72/02 ,  H04W72/04 ,  H04W76/02

Abstract: Un aparato que comprende: una memoria; y un procesador, acoplado con la memoria, configurado para seleccionar un canal para establecer en un ancho de banda de canal seleccionado de al menos un primer ancho de banda de canal y un segundo ancho de banda de canal, un límite de canal seleccionado a partir de una pluralidad de límites de primer canal cuando se selecciona el primer ancho de banda de canal y a partir de una pluralidad de límites de segundo canal cuando se selecciona el segundo ancho de banda de canal, en el que los límites de segundo canal son un subconjunto de los límites de primer canal y cada uno de la pluralidad de límites de segundo canal está separado del resto de la pluralidad de límites de segundo canal en al menos el segundo ancho de banda de canal.

公开(公告)号：HK1096218A1

公开(公告)日：2007-05-25

申请号：HK07103043

申请日：2007-03-21

Applicant: QUALCOMM INC

Inventor： WALTON J RODNEY ,  NANDA SANJIV

IPC: H04B7/005 ,  H04L20060101 ,  H04L12/28 ,  H04L12/56 ,  H04L12/66 ,  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：CA2588108A1

公开(公告)日：2006-05-26

申请号：CA2588108

申请日：2005-11-15

Applicant: QUALCOMM INC

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

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

Abstract: A method for wireless communications, comprising receiving, via a second communication link, feedback for packets sent in a first data transmission via a first communication link; estimating signal-to-noise-and-interference ratio (SNR) of the first communication link based on an estimated SNR of the second communication link, an asymmetric parameter indicating a difference in channel quality between the first and second communication links, and at least one back-off factor used to used to reduce the SNR estimate from an average SNR; adjusting at least one back-off factor based on the received feedback; and selecting a rate for a second data transmission based on the estimated channel quality of the first communication link as well as a corresponding apparatus.

公开(公告)号：CA2588176A1

公开(公告)日：2006-05-18

申请号：CA2588176

申请日：2005-11-15

Applicant: QUALCOMM INC

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

IPC: G06F17/16 ,  H04J99/00