Patents by Inventor James Womack

James Womack has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 9960881
    Abstract: A method for determining a Modulation and Coding Scheme (MCS) and power control includes determining an error rate of a communication channel between the UA and at least one of the base station and the RN. When the error rate is below a first threshold, the method includes at least one of increasing the MCS, and reducing a transmission power of the UA. When the error rate is above a second threshold, the method includes at least one of decreasing the MCS, and increasing a transmission power of the UA.
    Type: Grant
    Filed: April 28, 2017
    Date of Patent: May 1, 2018
    Assignee: BlackBerry Limited
    Inventors: Rose Qingyang Hu, Yi Yu, Zhijun Cai, James Womack, Yi Song, Chandra S. Bontu, Mo-Han Fong
  • Publication number: 20170244514
    Abstract: A method for determining a Modulation and Coding Scheme (MCS) and power control includes determining an error rate of a communication channel between the UA and at least one of the base station and the RN. When the error rate is below a first threshold, the method includes at least one of increasing the MCS, and reducing a transmission power of the UA. When the error rate is above a second threshold, the method includes at least one of decreasing the MCS, and increasing a transmission power of the UA.
    Type: Application
    Filed: April 28, 2017
    Publication date: August 24, 2017
    Inventors: Rose Qingyang Hu, Yi Yu, Zhijun Cai, James Womack, Yi Song, Chandra S. Bontu, Mo-Han Fong
  • Patent number: 9674792
    Abstract: A method for determining a Modulation and Coding Scheme (MCS) and power control includes determining an error rate of a communication channel between the UA and at least one of the base station and the RN. When the error rate is below a first threshold, the method includes at least one of increasing the MCS, and reducing a transmission power of the UA. When the error rate is above a second threshold, the method includes at least one of decreasing the MCS, and increasing a transmission power of the UA.
    Type: Grant
    Filed: August 12, 2010
    Date of Patent: June 6, 2017
    Assignee: BlackBerry Limited
    Inventors: Rose Qingyang Hu, Yi Yu, Zhijun Cai, James Womack, Yi Song, Chandra S. Bontu, Mo-Han Fong
  • Patent number: 8964664
    Abstract: In a system for allocating resources of a wireless communication system power levels of downlink (DL) communication channels and coupling losses of uplink (UL) communication channels are determined. When the power level of the DL communication channel between a base station and a UA is greater than the power levels of the DL communication channels between each of a plurality of RNs and the UA, and the coupling losses of the UL communication channel between at least one of the RNs and the UA are less than the coupling losses of the UL communication channel between the base station and the UA, a DL communication channel resource on the base station to the UA, and a UL communication channel resource on the at least one of the plurality of RNs to the UA are allocated.
    Type: Grant
    Filed: August 12, 2010
    Date of Patent: February 24, 2015
    Assignee: BlackBerry Limited
    Inventors: Rose Qingyang Hu, Yi Yu, Zhijun Cai, James Womack, Yi Song, Chandra S. Bontu, Mo-Han Fong
  • Patent number: 8964609
    Abstract: The present disclosure is directed to a system and method for operating a user agent (UA) and access device located within a communications cell according to a half-duplex (HD), frequency-division duplexing (FDD) protocol. The system and method are designed to accommodate a guard period (GP) between downlink (DL) and uplink (UL) communications from the UA, while addressing the loss of at least part of the DL communication before a subsequent UL subframe to accommodate the GP.
    Type: Grant
    Filed: September 28, 2009
    Date of Patent: February 24, 2015
    Assignee: BlackBerry Limited
    Inventors: James Womack, Zhijun Cai, Wei Wu, Yi Yu
  • Patent number: 8798662
    Abstract: Transmission of data from a portable communication device to a station via a radio frequency signal uses a protocol that has recurring frames, each having a plurality of transmission slots, different numbers of which can be used to transmit the data. When the portable communication device desires to send a data transmission, a first value is selected for either a power level for the radio frequency signal or the number of transmission slots to use. Then the first value is used to select a second value for the other one of the power level and the number of transmission slots. The first and second values are selected so that the data transmission at the selected power level using the selected number of transmission slots does not result in a specific absorption rate that is greater than a specific absorption rate limit.
    Type: Grant
    Filed: August 5, 2009
    Date of Patent: August 5, 2014
    Assignee: BlackBerry Limited
    Inventors: Shirook Ali, James Womack, Houssam Kanj, Amin Mobasher
  • Patent number: 8429477
    Abstract: Disclosed is a user equipment in a wireless communication system, configured to receive a first initial transmission associated with a first Hybrid Automatic Repeat Request (HARQ) process; receive a second initial transmission associated with a second HARQ process; and receive at least one retransmission associated with the first HARQ process, wherein when the second initial transmission occurs before the at least one retransmission, the second HARQ process assigned an HARQ process ID that is different from an HARQ process ID assigned to the first HARQ, and wherein when the second initial transmission occurs after the at least one retransmission, the second HARQ process assigned an HARQ process ID that is the same as an HARQ process ID assigned to the first HARQ process.
    Type: Grant
    Filed: September 12, 2012
    Date of Patent: April 23, 2013
    Assignee: Research In Motion Limited
    Inventors: Zhijun Cai, Yi Yu, James Womack, Takashi Suzuki
  • Publication number: 20130095748
    Abstract: A method for determining a Modulation and Coding Scheme (MCS) and power control includes determining an error rate of a communication channel between the UA and at least one of the base station and the RN. When the error rate is below a first threshold, the method includes at least one of increasing the MCS, and reducing a transmission power of the UA. When the error rate is above a second threshold, the method includes at least one of decreasing the MCS, and increasing a transmission power of the UA.
    Type: Application
    Filed: August 12, 2010
    Publication date: April 18, 2013
    Applicant: RESEARCH IN MOTION LIMITED
    Inventors: Rose Qingyang Hu, Yi Yu, Zhijun Cai, James Womack, Yi Song, Chandra S. Bontu, Mo-Han Fong
  • Publication number: 20130077506
    Abstract: In a system for allocating resources of a wireless communication system power levels of downlink (DL) communication channels and coupling losses of uplink (UL) communication channels are determined. When the power level of the DL communication channel between a base station and a UA is greater than the power levels of the DL communication channels between each of a plurality of RNs and the UA, and the coupling losses of the UL communication channel between at least one of the RNs and the UA are less than the coupling losses of the UL communication channel between the base station and the UA, a DL communication channel resource on the base station to the UA, and a UL communication channel resource on the at least one of the plurality of RNs to the UA are allocated.
    Type: Application
    Filed: August 12, 2010
    Publication date: March 28, 2013
    Applicant: RESEARCH IN MOTION LIMITED
    Inventors: Rose Qingyang Hu, Yi Yu, Zhijun Cai, James Womack, Yi Song, Chandra S. Bontu, Mo-Han Fong
  • Patent number: 8358615
    Abstract: Transmission of data from a portable communication device to a base station via a radio frequency signal uses a plurality of modulation and coding schemes and a protocol that has recurring frames. Each frame has a plurality of transmission slots, different numbers of which can be used to transmit data. When it is desired to transmit data a higher rate than was used previously, an attempt is made to increase the number transmission slots being used. If doing so, produces a transmission results in a specific absorption rate limit being exceeded, then the modulation and coding scheme is changed to one having a greater data coding rate. The power level and the number transmission slots then are set so that the data transmission does not exceed the specific absorption rate limit. The data is then transmitted by the portable communication device.
    Type: Grant
    Filed: March 11, 2010
    Date of Patent: January 22, 2013
    Assignee: Research In Motion Limited
    Inventors: Shirook Ali, James Womack, Amin Mobasher, James Warden
  • Publication number: 20130003685
    Abstract: Disclosed is a user equipment in a wireless communication system, configured to receive a first initial transmission associated with a first Hybrid Automatic Repeat Request (HARQ) process; receive a second initial transmission associated with a second HARQ process; and receive at least one retransmission associated with the first HARQ process, wherein when the second initial transmission occurs before the at least one retransmission, the second HARQ process assigned an HARQ process ID that is different from an HARQ process ID assigned to the first HARQ, and wherein when the second initial transmission occurs after the at least one retransmission, the second HARQ process assigned an HARQ process ID that is the same as an HARQ process ID assigned to the first HARQ process.
    Type: Application
    Filed: September 12, 2012
    Publication date: January 3, 2013
    Applicant: RESEARCH IN MOTION LIMITED
    Inventors: Zhijun Cai, Yi Yu, James Womack, Takashi Suzuki
  • Patent number: 8335959
    Abstract: A method is provided for reuse of one of a plurality of hybrid automatic repeat request (HARQ) Process ID. The method includes receiving signaling used to associate at least one of the plurality of HARQ Process IDs with semi-persistent scheduling. The method further includes determining an activation of a semi-persistent resource. The method further includes associating the at least one of the plurality of HARQ Process IDs with the semi-persistent resource. The method further includes receiving a non-semi-persistent data communication utilizing the at least one of a plurality of HARQ Process IDs.
    Type: Grant
    Filed: June 5, 2009
    Date of Patent: December 18, 2012
    Assignee: Research In Motion Limited
    Inventors: Zhijun Cai, Yi Yu, James Womack, Takashi Suzuki
  • Publication number: 20120287912
    Abstract: A method for packet data retransmission on Hybrid Automatic Repeat Request (HARQ) Transmission failure having the steps of: checking whether changes to HARQ transmission error performance characteristics are greater than a threshold and/or a deterioration of channel conditions is indicated or less than threshold; if yes, re-segmenting an RLC-SDU or RLC-PDU data into smaller PDU data sizes; and transmitting said re-segmented RLC-PDU data; and if not yes, transmitting previous RLC-PDU data.
    Type: Application
    Filed: July 24, 2012
    Publication date: November 15, 2012
    Applicant: RESEARCH IN MOTION LIMITED
    Inventors: Takashi Suzuki, James Womack, Gordon Peter Young
  • Patent number: 8307250
    Abstract: A method is provided for associating initial transmissions and retransmissions in semi-persistent scheduling. The method includes providing a first initial transmission associated with a first assigned Hybrid Automatic Repeat Request (HARQ) process ID. The method further includes providing a second initial transmission associated with a second assigned HARQ process ID. The method further includes providing at least one retransmission associated with the first HARQ process ID. The second initial transmission occurs before the at least one retransmission, and the second assigned HARQ process ID is different from the first assigned HARQ process ID.
    Type: Grant
    Filed: June 5, 2009
    Date of Patent: November 6, 2012
    Assignee: Research In Motion Limited
    Inventors: Zhijun Cai, Yi Yu, James Womack, Takashi Suzuki
  • Patent number: 8289895
    Abstract: A method for preventing a relay node from missing a transmission from an access node. The method includes, when a ten millisecond periodicity is used for Multicast/Broadcast Single Frequency Network (MBSFN) subframes, setting a time between an uplink grant from the access node to the relay node and an acknowledgement/negative-acknowledgement message (ACK/NACK) from the access node to the relay node equal to ten milliseconds. The method further includes, when a forty millisecond periodicity is used for MBSFN subframes, the access node sending the relay node an asynchronous grant for an uplink retransmission when a data packet is missed, and when the relay node receives the grant for the uplink retransmission, the relay node retransmitting the missed data packet.
    Type: Grant
    Filed: April 24, 2009
    Date of Patent: October 16, 2012
    Assignee: Research In Motion Limited
    Inventors: Yi Yu, Zhijun Cai, James Womack, Andrew Mark Earnshaw
  • Patent number: 8254315
    Abstract: A method for packet data retransmission on Hybrid Automatic Repeat Request (HARQ) Transmission failure having the steps of: checking whether changes to HARQ transmission error performance characteristics are greater than a threshold and/or a deterioration of channel conditions is indicated or less than threshold; if yes, re-segmenting an RLC-SDU or RLC-PDU data into smaller PDU data sizes; and transmitting said re-segmented RLC-PDU data; and if not yes, transmitting previous RLC-PDU data.
    Type: Grant
    Filed: October 31, 2006
    Date of Patent: August 28, 2012
    Assignee: Research in Motion Limited
    Inventors: Takashi Suzuki, James Womack, Gordon Peter Young
  • Publication number: 20110305182
    Abstract: A method for indicating and interpreting robust MAC signaling, the indicating method having the steps of: checking whether a MAC-PDU contains control information; and if yes, providing an indication to use a robust configuration for a HARQ feedback transmission, and the interpreting method having the steps of: receiving a MAC-PDU; checking whether an indication for robust HARQ feedback transmission is provided; and if yes, utilizing robust HARQ feedback transmission.
    Type: Application
    Filed: August 22, 2011
    Publication date: December 15, 2011
    Applicant: RESEARCH IN MOTION LIMITED
    Inventors: Takashi Suzuki, Gordon Peter Young, James Womack
  • Publication number: 20110222469
    Abstract: Transmission of data from a portable communication device to a base station via a radio frequency signal uses a plurality of modulation and coding schemes and a protocol that has recurring frames. Each frame has a plurality of transmission slots, different numbers of which can be used to transmit data. When it is desired to transmit data a higher rate than was used previously, an attempt is made to increase the number transmission slots being used. If doing so, produces a transmission results in a specific absorption rate limit being exceeded, then the modulation and coding scheme is changed to one having a greater data coding rate. The power level and the number transmission slots then are set so that the data transmission does not exceed the specific absorption rate limit. The data is then transmitted by the portable communication device.
    Type: Application
    Filed: March 11, 2010
    Publication date: September 15, 2011
    Inventors: Shirook Ali, James Womack, Amin Mobasher, James Warden
  • Publication number: 20110034135
    Abstract: Transmission of data from a portable communication device to a station via a radio frequency signal uses a protocol that has recurring frames, each having a plurality of transmission slots, different numbers of which can be used to transmit the data. When the portable communication device desires to send a data transmission, a first value is selected for either a power level for the radio frequency signal or the number of transmission slots to use. Then the first value is used to select a second value for the other one of the power level and the number of transmission slots. The first and second values are selected so that the data transmission at the selected power level using the selected number of transmission slots does not result in a specific absorption rate that is greater than a specific absorption rate limit.
    Type: Application
    Filed: August 5, 2009
    Publication date: February 10, 2011
    Inventors: Shirook Ali, James Womack, Houssam Kanj, Amin Mobasher
  • Publication number: 20100271999
    Abstract: A method for preventing a relay node from missing a transmission from an access node. The method includes, when a ten millisecond periodicity is used for Multicast/Broadcast Single Frequency Network (MBSFN) subframes, setting a time between an uplink grant from the access node to the relay node and an acknowledgement/negative-acknowledgement message (ACK/NACK) from the access node to the relay node equal to ten milliseconds. The method further includes, when a forty millisecond periodicity is used for MBSFN subframes, the access node sending the relay node an asynchronous grant for an uplink retransmission when a data packet is missed, and when the relay node receives the grant for the uplink retransmission, the relay node retransmitting the missed data packet.
    Type: Application
    Filed: April 24, 2009
    Publication date: October 28, 2010
    Applicant: RESEARCH IN MOTION CORPORATION
    Inventors: Yi Yu, Zhijun Cai, James Womack, Andrew Mark Earnshaw