公开(公告)号：CO5680501A2

公开(公告)日：2006-09-29

申请号：CO05002611

申请日：2005-01-14

Applicant: QUALCOMM INC

Inventor： MILLER DAVID S ,  SCHIFF LEONARD N

IPC: H04B7/26

Abstract: 1.- Un método para suministrar comunicación CDMAortogonal en un enlace de retorno, que comprende:Recibir una primera señal piloto en una pluralidad de terminales;Derivar al menos una característica de tiempo de transmisión de la primer señal piloto recibida, en donde derivar se desarrolla dentro de cada uno de la pluralidad de terminales;Transmitir, en un tiempo asignado, una señal piloto desde cada una de una pluralidad de terminales de acuerdo con la al menos una característica de tiempo de transmisión derivada;Recibir una señal de control, el contenido de la señal de control que suministra instrucciones para ajustar la al menos una característica de tiempo de transmisión; yAjustar, en respuesta a la señal de control, la al menos una característica de tiempo de transmisión.

公开(公告)号：CA2568605A1

公开(公告)日：2005-12-22

申请号：CA2568605

申请日：2005-05-27

Applicant: QUALCOMM INC

Inventor： JALALI AHMAD ,  SCHIFF LEONARD N ,  SHI WEI

IPC: H04B7/185

Abstract: Methods and apparatus are disclosed to provide orthogonal multiple access communication in a return link of a satellite communication system. In one embodiment, a closed loop control of a transmit parameter associated with transmission of signals may be performed. In addition, changes in motion of a terminal are monitored such that an open loop control of the transmit parameter is performed, if the detected change meets a certain threshold. For example, an open control is performed if an abrupt or sudden motion is detected.

公开(公告)号：BR0312088A

公开(公告)日：2005-04-26

申请号：BR0312088

申请日：2003-06-24

Applicant: QUALCOMM INC

Inventor： MILLER DAVID S ,  SCHIFF LEONARD N

IPC: H04B1/707 ,  H04B7/216 ,  H04B7/26

Abstract: A technique for realizing code synchronism to enable the application of modulation codes needed for implementing orthogonal CDMA modulation for reverse link communications. In a satellite communications system using orthogonal CDMA in the reverse link, a ground station transmits a first pilot signal in the forward link direction, which is acquired and tracked by a terminal or remote station, and used in recovering carrier phase and modulation chip clock timing. The terminal then derives a transmission carrier frequency and chip clock timing to be used, from the recovered forward pilot carrier frequency and chip clock timing. The terminal transmits a second pilot signal in the reverse link direction which, after being received and retransmitted by a satellite, is detected at the ground station. Terminals have the ability to advance or retard the timing of their signals for transmission relative to the timing derived from the forward link pilot signal. The ground station tracks timing, and in some embodiments also tracks frequency, of the terminal pilot signal, and compares these parameters to a reverse link reference signal. Based at least in part on the results of the comparison, the ground station transmits a control signal on the forward link to each terminal, thereby commanding the terminal to advance or retard its respective transmission timing. Each terminal then adjusts its transmission timing and/or frequency in small increments to maintain a desired level of time alignment with the ground station.

公开(公告)号：AU2003254142A1

公开(公告)日：2004-02-09

申请号：AU2003254142

申请日：2003-07-23

Applicant: QUALCOMM INC

Inventor： SCHIFF LEONARD N

IPC: H04L1/00

Abstract: Time-scattering of data is employed to reduce the interference effects, such as, error rate, between terminals disposed in nearby beams, or cells, of a communication system. A scattering schedule is determined, typically by a gateway, for a terminal. Scattering instructions, based at least in part on that scattering schedule, are provided to the terminal. The scattering instructions provide terminals with information suitable for controlling the temporal scattering of time slot data to be transmitted by the terminals so that interference impact of nearby out-of beam terminals is reduced. Time-scattered data received by a receiver remote from the terminal is returned to the desired order by sorting the data in accordance with the scattering schedule to achieve a reversing of the scattering. Time-scattering may be applied to data moving in either or both of the forward and reverse directions of a communication system.

公开(公告)号：AU2003252130A1

公开(公告)日：2004-02-09

申请号：AU2003252130

申请日：2003-07-23

Applicant: QUALCOMM INC

Inventor： SCHIFF LEONARD N

IPC: H04B7/26 ,  H04B1/00 ,  H04B7/005 ,  H04B7/19 ,  H04W52/26 ,  H04Q11/04

Abstract: In a communication system, controlling transmission power and transmission data rate to reduce transmission power fluctuations. Data for transmission is queued in a data storage queue, and the amount of data in the queue is represented by a queue length. When the queue length is within a predetermined range, queued data is transmitted at a first power level and data rate. When a determination is made that the queue length is outside the predetermined range, a corresponding change to transmission power and data rate is made. When the queue length is exceeds a predetermined upper limit, transmission power and data rate are increased. When the queue length is less than a predetermined lower limit, transmission power and data rate are decreased. In a further aspect, the magnitude of changes to transmission power and data rate are based, at least in part, on the magnitude by which the queue length is outside the predetermined range.

公开(公告)号：CA2493549A1

公开(公告)日：2004-01-29

申请号：CA2493549

申请日：2003-07-23

Applicant: QUALCOMM INC

Inventor： SCHIFF LEONARD N

IPC: H04B7/26 ,  H04B1/00 ,  H04B7/005 ,  H04B7/19 ,  H04W52/26 ,  H04Q11/04

Abstract: In a communication system, controlling transmission power and transmission data rate to reduce transmission power fluctuations. Data for transmission i s queued in a data storage queue, and the amount of data in the queue is represented by a queue length. When the queue length is within a predetermin ed range, queued data is transmitted at a first power level and data rate. When a determination is made that the queue length is outside the predetermined range, a corresponding change to transmission power and data rate is made. When the queue length is exceeds a predetermined upper limit, transmission power and data rate are increased. When the queue length is less than a predetermined lower limit, transmission power and data rate are decreased. I n a further aspect, the magnitude of changes to transmission power and data ra te are based, at least in part, on the magnitude by which the queue length is outside the predetermined range.

公开(公告)号：AU769495B2

公开(公告)日：2004-01-29

申请号：AU3931700

申请日：2000-03-29

Applicant: QUALCOMM INC

Inventor： SCHIFF LEONARD N

IPC: H04B7/26 ,  H04B7/185 ,  H04Q7/38

Abstract: Apparatus and method for paging a user terminal (UT) using a satellite communications system having a gateway and one or more satellites, wherein each satellite produces a plurality (n) of beams and each beam includes a plurality of channels. The method of the present invention includes the step of recalling a first location of the UT, wherein the first location corresponds to a location of the UT at a first time t1. In one embodiment, this is accomplished by performing a lookup in a table or database that includes location information for user terminals at different points in time. The method also includes the step of determining a first group (g1) of beams which covers the first location of the UT at a second time t2, where g1

公开(公告)号：AU769377B2

公开(公告)日：2004-01-22

申请号：AU4821700

申请日：2000-05-03

Applicant: QUALCOMM INC

Inventor： SCHIFF LEONARD N

IPC: H04B7/185 ,  H04B7/204

公开(公告)号：HK1052803A1

公开(公告)日：2003-09-26

申请号：HK03104953

申请日：2003-07-09

Applicant: QUALCOMM INC

Inventor： SCHIFF LEONARD N

IPC: H04B20060101 ,  H04B7/216 ,  H04L20060101 ,  H04L5/12

公开(公告)号：AU763381B2

公开(公告)日：2003-07-24

申请号：AU5219799

申请日：1999-07-21

Applicant: QUALCOMM INC

Inventor： ANTONIO FRANKLIN P ,  MARSH GENE W ,  STEWART RICHARD A ,  BJEREDE MARIE M ,  CHOCKALINGAM ANANTHANARAYANAN ,  KERNS ARTHUR S ,  BUTLER BRIAN ,  GROB MATTHEW S ,  DETERMAN JAMES T ,  GROVER DOUGLAS ,  SCHIFF LEONARD N ,  AMES WILLIAM G

IPC: H04B7/26 ,  H04B7/02 ,  H04B7/185 ,  H04Q7/36

Abstract: A method for reducing call dropping rates in a multi-beam communication system. The multi-beam communication system includes a user terminal, a gateway, and a plurality of beam sources, where each beam source projects a plurality of beams, and where a communication link between the user terminal and the gateway is established on one or more beams. The method according to the present invention relies on a messaging protocol between the gateway and the user terminal. Based on messages sent from the user terminal to the gateway, preferably on a preselected periodic basis, the gateway can determine the more desirable beam(s) for transmitting data or information to the user terminal. The messages sent from the user terminal to the gateway contain values representing beam strengths as measured at the user terminal. The gateway uses the user terminal measured beam strengths to select the beams that should be used for transmitting data or information to the user terminal. The beams that should be used are the beams that if used will decrease the call dropping rates and provide a desired level of beam source diversity.