METODO Y APARATO PARA APORTAR ESTIMACIONES DE POSICION PRECISAS EN CASOS DE SEVERA DILUCION DE LA PRECISION

    公开(公告)号:AR034627A1

    公开(公告)日:2004-03-03

    申请号:ARP020102381

    申请日:2002-06-24

    Applicant: QUALCOMM INC

    Abstract: Técnicas que aportan una estimación de posición mejorada para un dispositivo en casos de dilución de la precisión relativamente importante. En un método, se reciben inicialmente estimaciones de posición para un número de transmisores (por ejemplo, satélites GPS y/o estaciones base) y un conjunto de mediciones iniciales (por ejemplo, pseudo rangos). Se computa un vector de actualización para una estimación de posición del dispositivo actual. Se detecta la no convergencia de una estimación de posición del dispositivo actual a una estimación de posición meta y, de ser verdadera, se ajusta el vector de actualización (por ejemplo, un factor de equilibrio lo reduce en magnitud) para aumentar la probabilidad de convergencia a la estimación de posición que se desea alcanzar. Luego se actualiza la estimación de posición del dispositivo actual sobre la base del vector de actualización (posiblemente ajustado). La no convergencia se puede detectar sobre la base del número de iteraciones realizadas sin alcanzar la estimación de posición meta y/o la inversión de fase en dos vectores de actualización consecutivos. El factor de escala se puede aumentar con cada evento detectado que indique la no convergencia.

    23.
    发明专利
    未知

    公开(公告)号:BRPI0512133A

    公开(公告)日:2008-02-06

    申请号:BRPI0512133

    申请日:2005-06-14

    Applicant: QUALCOMM INC

    Abstract: Methods and Systems are disclosed for use in a communication system 200 to selectively delay transmitting a second negative acknowledgement (NAK) after an initial NAK has already been sent requesting retransmission of a corrupted packet. The receiving entity 210 initiates a NAK prohibit timer 641 associated with a specific NAK 631 which prevents status reports to transmitting entity 220 from including a retransmission of the specific NAK until the timer expires. Use of the NAK prohibit timer 641 reduces the likelihood of spurious retransmissions from the transmitting entity 220 caused by a second NAK from the receiving entity 210 when the retransmission process has already been initiated.

    Method and apparatus for link control in wireless communications

    公开(公告)号:AU2005264976A1

    公开(公告)日:2006-01-26

    申请号:AU2005264976

    申请日:2005-06-14

    Applicant: QUALCOMM INC

    Abstract: Methods and Systems are disclosed for use in a communication system 200 to selectively delay transmitting a second negative acknowledgement (NAK) after an initial NAK has already been sent requesting retransmission of a corrupted packet. The receiving entity 210 initiates a NAK prohibit timer 641 associated with a specific NAK 631 which prevents status reports to transmitting entity 220 from including a retransmission of the specific NAK until the timer expires. Use of the NAK prohibit timer 641 reduces the likelihood of spurious retransmissions from the transmitting entity 220 caused by a second NAK from the receiving entity 210 when the retransmission process has already been initiated.

    METODO Y APARATO PARA CALCULAR LA VELOCIDAD DE UNA TERMINAL EN UN SISTEMA DE COMUNICACION INALAMBRICO.

    公开(公告)号:MXPA03003652A

    公开(公告)日:2004-05-04

    申请号:MXPA03003652

    申请日:2001-10-29

    Applicant: QUALCOMM INC

    Abstract: Las tecnicas para calcular la velocidad de una terminal en un sistema de comunicacion inalambrico. El movimiento de los resultados de la terminal en un cambio Doppler en la frecuencia de cada senal transmitida recibida en la terminal. En un metodo, son determinadas las posiciones de la terminal, una estacion base, y cada uno de dos o mas satelites inicialmente. Tambien se puede determinar un indice de cambio residual de pseudo-rango por cada satelite, por ejemplo, basado en (1) un error de frecuencia de banda de base calculado que incluye un cambio de frecuencia Doppler debido al movimiento de la terminal y (2) un cambio de frecuencia Doppler calculado debido al movimiento del satelite. Entonces se forma un conjunto de ecuaciones basado en las posiciones determinadas de la terminal, la estacion base y los satelites y los indices de cambio residual de pseudo-rango determinados para los satelites. La velocidad de la terminal puede ser calculada posteriormente basada en un conjunto de ecuaciones.

    METHOD AND APPARATUS FOR PROVIDING ACCURATE POSITION ESTIMATES IN INSTANCES OF SEVERE DILUTION OF PRECISION

    公开(公告)号:CA2451290A1

    公开(公告)日:2003-01-03

    申请号:CA2451290

    申请日:2002-06-17

    Applicant: QUALCOMM INC

    Abstract: Techniques for providing an improved position estimate for a device in instances of relatively large dilution of precision. In a method, position estimates for a number of transmitters (e.g., GPS satellites and/or base stations) and a set of initial measurements (e.g., pseudo-ranges) are initially received. An Update Vector for a current device position estimate is computed. Non-convergence of the current device position estimate toward a target position estimate is detected and, if true, the Update Vector is adjusted (e.g., reduced in magnitude by a scaling factor) to increase the likelihood of convergence to the target position estimate. The current devic e position estimate is then updated based on the (possibly adjusted) Update Vector. Non-convergence may be detected based on the number of iterations performed without reaching the target position estimate and/or phase reversa l in two consecutive Update Vectors. The scaling factor may be increased with each detected event indicative of non-convergence.

    METHOD AND APPARATUS FOR ESTIMATING VELOCITY OF A TERMINAL IN A WIRELESS COMMUNICATION SYSTEM

    公开(公告)号:CA2427129A1

    公开(公告)日:2002-07-18

    申请号:CA2427129

    申请日:2001-10-29

    Applicant: QUALCOMM INC

    Abstract: Techniques to estimate the velocity of a terminal in a wireless communicatio n system. Movement by the terminal results in a Doppler shift in the frequency of each transmitted signal received at the terminal. In one method, the positions of the terminal, a base station, and each of two or more satellite s are initially determined. A residual rate of a change of pseudo-range may al so be determined for each satellite, e.g., based on (1) an estimated baseband frequency error that includes the Doppler frequency shift due to the terminal's movement and (2) an estimated Doppler frequency shift due to movement by the satellite. A set of equations is then formed based on the determined positions of the terminal, the base station, and the satellites a nd the determined residual rates of change of pseudo-ranges for the satellites. The velocity of the terminal may thereafter be estimated based on the set of equations.

    METHOD AND APPARATUS FOR PROVIDING ACCURATE POSITION ESTIMATES IN INSTANCES OF SEVERE DILUTION OF PRECISION

    公开(公告)号:CA2451290C

    公开(公告)日:2012-02-07

    申请号:CA2451290

    申请日:2002-06-17

    Applicant: QUALCOMM INC

    Abstract: Techniques for providing an improved position estimate for a device in instances of relatively large dilution of precision. In a method, position estimates for a number of transmitters (e.g., GPS satellites and/or base stations) and a set of initial measurements (e.g., pseudo-ranges) are initially received. An Update Vector for a current device position estimate is computed. Non-convergence of the current device position estimate toward a target position estimate is detected and, if true, the Update Vector is adjusted (e.g., reduced in magnitude by a scaling factor) to increase the likelihood of convergence to the target position estimate. The current device position estimate is then updated based on the (possibly adjusted) Update Vector. Non-convergence may be detected based on the number of iterations performed without reaching the target position estimate and/or phase reversal in two consecutive Update Vectors. The scaling factor may be increased with each detected event indicative of non-convergence.

    METHOD AND APPARATUS FOR PROVIDING ACCURATE POSITION ESTIMATES IN INSTANCES OF SEVERE DILUTION OF PRECISION

    公开(公告)号:MY130562A

    公开(公告)日:2007-06-29

    申请号:MYPI20022343

    申请日:2002-06-21

    Applicant: QUALCOMM INC

    Abstract: TECHNIQUES FOR PROVIDING AN IMPROVED POSITION ESTIMATE FOR A DEVICE IN INSTANCES OF RELATIVELY LARGE DILUTION OF PRECISION.IN A METHOD, POSITION ESTIMATES FOR A NUMBER OF TRANSMITTERS (E.G., GPS SATELLITES AND/OR BASE STATIONS) AND A SET OF INITIAL MEASUREMENTS (E.G., PSEUDO-RANGES) ARE INITIALLY RECEIVED. AN UPDATE VECTOR FOR A CURRENT DEVICE POSITION ESTIMATE IS COMPUTED. NONCONVERGENCE (318) OF THE CURRENT DEVICE POSITION ESTIMATE TOWARD A TARGET POSITION ESTIMATE IS DETECTED AND, IF TRUE, THE UPDATE VECTOR IS ADJUSTED (320) (E.G., REDUCED IN MAGNITUDE BY A SCALING FACTOR) TO INCREASE THE LIKELIHOOD OF CONVERGENCE TO THE TARGET POSITION ESTIMATE. THE CURRENT DEVICE POSITION ESTIMATE IS THEN UPDATED BASED ON THE (POSSIBLY ADJUSTED) UPDATE VECTOR. NON-CONVERGENCE (318) MAY BE DETECTED BASED ON THE NUMBER OF ITERATIONS PERFORMED WITHOUT REACHING THE TARGET POSITION ESTIMATE AND/OR PHASE REVERSAL IN TWO CONSECUTIVE UPDATE VECTORS. THE SCALING FACTOR MAY BE INCREASED WITH EACH DETECTED EVENT INDICATIVE OF NON-CONVERGENCE.(FIG 3)

    CONFIGURACIONES POR DEFECTO CON CODIFICACION DIFERENCIAL EN UN SISTEMA DE COMUNICACIONES INALAMBRICAS.

    公开(公告)号:MX2007001769A

    公开(公告)日:2007-04-23

    申请号:MX2007001769

    申请日:2005-08-11

    Applicant: QUALCOMM INC

    Abstract: Se describen tecnicas para configurar y reconfigurar eficientemente llamadas utilizando un conjunto de configuraciones por defecto y codificacion diferencial. En la parte de red, inicialmente se detecta una configuracion para utilizar para la comunicacion con un dispositivo inalambrico. Una configuracion por defecto se identifica entre un conjunto de configuraciones por defecto. Se determinan las diferencias, si las hay, entre la configuracion seleccionada y la configuracion por defecto. Una identidad para la configuracion por efecto y las diferencias, si las hay, se le envian al dispositivo inalambrico para transmitir la configuracion seleccionada. En el dispositivo inalambrico, se recibe inicialmente el mensaje que contiene la identidad para la configuracion por defecto. La configuracion por defectos se obtiene a partir de una memoria con base en la identidad. Se realiza una determinacion sobre si el mensaje contiene diferencias entre la configuracion por defecto y la configuracion seleccionada. Los valores para la configuracion por defecto se reemplazan con las diferencias, si las hay, enviadas en el mensaje.

Patent Agency Ranking