公开(公告)号：CA2459667A1

公开(公告)日：2003-02-27

申请号：CA2459667

申请日：2002-08-08

Applicant: QUALCOMM INC

Inventor： HOLTZMAN JACK ,  BARRIAC GWENDOLYN D

IPC: H04B1/00 ,  H04L12/841 ,  H04W28/12 ,  H04W72/12 ,  H04L12/56

Abstract: A method (100) for scheduling packet data transmissions in a wireless communication system wherein a per-user Priority Function (PF) is calculated as a function of packet delay time of the user. When a given user has a pack et delay time violating a threshold, the PF of the user is adjusted accordingly . In one embodiment, a delay function is applied to the PF calculation, wherei n the delay function considers the average requested data rate for all users i n the active set having pending data and the average data rate of a given user .

公开(公告)号：BR0014586A

公开(公告)日：2002-12-17

申请号：BR0014586

申请日：2000-10-07

Applicant: QUALCOMM INC

Inventor： RAZOUMOV LEONID ,  HOLTZMAN JACK ,  LUNDBY STEIN A

IPC: H04L1/00 ,  H04B7/005 ,  H04B7/26 ,  H04L1/16 ,  H04L1/18

Abstract: Method and apparatus for transmitting a signal at a predetermined level of reliability using retransmission of erroneously transmitted frames so as to minimize total transmission energy. The transmitting station evaluates the frame error rate (FER) as a function of energy. Next, the transmitting station determines a combination of initial transmission energies and retransmission energies that will provide the target level of reliability while minimizing the total transmission energy employed in the initial transmission and the retransmissions. The transmitting station transmits a frame with an initial transmission energy. Employing conventional feedback methods the transmitting station is alerted to the occurrence of frame errors at the receiving station. The transmitting station upon notification of a frame error retransmits the frame with an energy determined to minimize the total energy required to transmit the frame with a predetermined level of reliability.

公开(公告)号：HK1037812A1

公开(公告)日：2002-02-15

申请号：HK01108357

申请日：2001-11-28

Applicant: QUALCOMM INC

Inventor： LUNDBY STEIN A ,  TIEDEMANN EDWARD G JR ,  HOLTZMAN JACK ,  TERASAWA DAISUKE

IPC: H04B1/707 ,  H04W52/00 ,  H04W52/36 ,  H04B

Abstract: A first signal (74a) and a second signal (74b) are time-offset by a period to. Careful selection of the period to allows the peak-to-average transmit power ratio to be reduced.

公开(公告)号：AU4937901A

公开(公告)日：2001-10-15

申请号：AU4937901

申请日：2001-03-20

Applicant: QUALCOMM INC

Inventor： WALTON JAY R ,  WALLACE MARK ,  HOLTZMAN JACK ,  ANTONIO FRANKLIN P

IPC: H04J1/05 ,  H04B7/005 ,  H04B7/26 ,  H04J3/00 ,  H04J11/00 ,  H04W52/24 ,  H04W52/26 ,  H04W52/34

公开(公告)号：CA2386735A1

公开(公告)日：2001-04-19

申请号：CA2386735

申请日：2000-10-07

Applicant: QUALCOMM INC

Inventor： RAZOUMOV LEONID ,  LUNDBY STEIN A ,  HOLTZMAN JACK

IPC: H04L1/00 ,  H04B7/005 ,  H04B7/26 ,  H04L1/16 ,  H04L1/18

Abstract: Method and apparatus for transmitting a signal at a predetermined level of reliability using retransmission of erroneously transmitted frames so as to minimize total transmission energy. The transmitting station evaluates the frame error rate (FER) as a function of energy. Next, the transmitting stati on determines a combination of initial transmission energies and retransmission energies that will provide the target level of reliability while minimizing the total transmission energy employed in the initial transmission and the retransmissions. The transmitting station transmits a frame with an initial transmission energy. Employing conventional feedback methods the transmittin g station is alerted to the occurrence of frame errors at the receiving statio n. The transmitting station upon notification of a frame error retransmits the frame with an energy determined to minimize the total energy required to transmit the frame with a predetermined level of reliability.

公开(公告)号：AU6221700A

公开(公告)日：2001-02-05

申请号：AU6221700

申请日：2000-07-18

Applicant: QUALCOMM INC

Inventor： HOLTZMAN JACK ,  WARRIER DILIP G

IPC: H04B1/7103 ,  H04B1/00 ,  H04B1/10 ,  H04B1/707 ,  H04B1/7107 ,  H04B7/26

Abstract: Several methods and corresponding apparatus reduce multiple access interference in code division multiple access communications systems (100) through successive interference cancellation techniques. An estimate of reliability of cancellation of a strongest interfering signal is formed from analysis of a pilot signal associated with the strongest signal. The estimate is used to derive a weight that is multiplied by a replica of the strongest signal to provide a weighted replica. The weighted replica is subtracted from a delayed version of the received channel. As a result, interference cancellation is robustly implemented when the strongest signal replica is most likely to be accurate and is not robustly implemented when the strongest signal replica is not likely to be accurate.; This avoids combining a replica of the strongest signal with the received channel when the replica is more likely to contribute additional interference rather than reduce it.

公开(公告)号：CA2698363C

公开(公告)日：2014-12-02

申请号：CA2698363

申请日：2001-03-20

Applicant: QUALCOMM INC

Inventor： WALTON JAY R ,  WALLACE MARK ,  HOLTZMAN JACK ,  ANTONIO FRANKLIN P

IPC: H04J1/05 ,  H04W72/10 ,  H04B7/005 ,  H04B7/26 ,  H04J3/00 ,  H04J11/00 ,  H04W52/18 ,  H04W52/24 ,  H04W52/26 ,  H04W52/34

Abstract: In some aspects, each cell in the communications system can be designed to operate in accordance with a set of back-off factors that identify the reductions in peak transmit power levels for the channels associated with the back-off factors. The back-off factors are defined to provide the required power to a large percentage of the users while reducing the amount of interference. In some other aspects, the cells operate using an adaptive reuse scheme that allows the cells to efficiently allocate and reallocate the system resources to reflect changes in the system. A reuse scheme is initially defined and resources are allocated to the cells. During operation, changes in the operating conditions of the system are detected and the reuse scheme is redefined as necessary based on the detected changes. For example, the loading conditions of the cells can be detected, and the resources can be reallocated and/or the reuse scheme can be redefined. In yet other aspects, techniques are provided to efficiency schedule data transmissions and to assign channels to users. Data transmissions can be scheduled based on user priorities, some fairness criteria, system requirements, and other factors. Users are assigned to available channels based on a number of channel assignment schemes. Channel metrics are also provided, which can be used to prioritize users and for channel assignments.

公开(公告)号：CA2404055C

公开(公告)日：2012-01-03

申请号：CA2404055

申请日：2001-03-20

Applicant: QUALCOMM INC

Inventor： WALTON JAY R ,  WALLACE MARK ,  HOLTZMAN JACK ,  ANTONIO FRANKLIN P

IPC: H04B7/005 ,  H04J1/05 ,  H04B7/26 ,  H04J3/00 ,  H04J11/00 ,  H04W52/24 ,  H04W52/26 ,  H04W52/34

Abstract: In some aspects, each cell in the communications system can be designed to operate in accordance with a set of back-off factors that identify the reductions in peak transmit power levels for the channels associated with the back-off factors. The back-off factors are defined to provide the required power to a large percentage of the users while reducing the amount of interference. In some other aspects, the cells operate using an adaptive reuse scheme that allows the cells to efficiently allocate and reallocate the system resources to reflect changes in the system. A reuse scheme is initially defined and resources are allocated to the cells. During operation, changes in the operating conditions of the system are detected and the reuse scheme is redefined as necessary based on the detected changes. For example, the loading conditions of the cells can be detected, and the resources can be reallocated and/or the reuse scheme can be redefined. In yet other aspects, techniques are provided to efficiency schedule data transmissions and to assign channels to users. Data transmissions can be scheduled based on user priorities, some fairness criteria, system requirements, and other factors. Users are assigned to available channels based on a number of channel assignment schemes. Channel metrics are also provided, which can be used to prioritize users and for channel assignments.

公开(公告)号：DE60231512D1

公开(公告)日：2009-04-23

申请号：DE60231512

申请日：2002-08-08

Applicant: QUALCOMM INC

Inventor： HOLTZMAN JACK ,  BARRIAC GWENDOLYN D

IPC: H04B1/00 ,  H04L12/841 ,  H04W28/12 ,  H04W72/12

Abstract: A method ( 100 ) for scheduling packet data transmissions in a wireless communication system wherein a per-user Priority Function (PF) is calculated as a function of packet delay time of the user. When a given user has a packet delay time violating a threshold, the PF of the user is adjusted accordingly. In one embodiment, a delay function is applied to the PF calculation, wherein the delay function considers the average requested data rate for all users in the active set having pending data and the average data rate of a given user.

公开(公告)号：AT405037T

公开(公告)日：2008-08-15

申请号：AT02757874

申请日：2002-03-28

Applicant: QUALCOMM INC

Inventor： SARKAR SANDIP ,  HOLTZMAN JACK

IPC: H04B7/005 ,  H04B7/26

Abstract: Method and apparatus for power control in a packet-data switched communicaiton system by (30) adapting a transmission energy setpoint to transmission quality (104) and adjusted the retransmission energy setpoint accordingly (150)(110). In one embodiment, the retransmission energy setpoint is adjusted as a function of retransmission quality (164, 166, 168, 170).