Patents by Inventor Ling Hang
Ling Hang 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).
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Patent number: 9549354Abstract: Various embodiments include methods, systems, and devices for communicating with a first network and a second network using a mobile device having a single radio comprising a transmitter and a receiver. The transmitter and the receiver may be tuned to the first network. The transmitter may also transmit to the first network. The receiver may tune away to the second network for a tune-away period. The transmitter may transmit to the first network during the tune-away period. A determination may be made whether the transmitter and the receiver will cause interference during the tune-away period. Transmissions may be paused from the transmitter in response to determining that the transmitter and the receiver will cause interference during the tune-away period.Type: GrantFiled: August 6, 2015Date of Patent: January 17, 2017Assignee: QUALCOMM IncorporatedInventors: Chih-Ping Hsu, Farrukh Usmani, Ling Hang, Rajagopal Jeenagala
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Publication number: 20150350985Abstract: Various embodiments include methods, systems, and devices for communicating with a first network and a second network using a mobile device having a single radio comprising a transmitter and a receiver. The transmitter and the receiver may be tuned to the first network. The transmitter may also transmit to the first network. The receiver may tune away to the second network for a tune-away period. The transmitter may transmit to the first network during the tune-away period. A determination may be made whether the transmitter and the receiver will cause interference during the tune-away period. Transmissions may be paused from the transmitter in response to determining that the transmitter and the receiver will cause interference during the tune-away period.Type: ApplicationFiled: August 6, 2015Publication date: December 3, 2015Inventors: Chih-Ping HSU, Farrukh USMANI, Ling HANG, Rajagopal JEENAGALA
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Patent number: 9204353Abstract: Various embodiments include methods, systems, and devices for tuning away a mobile device's receiver without retuning the mobile device's transmitter, thereby allowing the mobile device to monitor multiple networks with a single radio frequency (RF) chain while avoiding the problems often associated with tune-away methods, such as loss of throughput, loss of tracking or synchronization, delays in acknowledgments, delays in rate control or channel quality control feedback, etc. The transmitter may remain tuned to a first network while the receiver may be separately tuned to one or more other networks. In various embodiments, the separately tuned receiver may monitor for paging signals on one or more networks while the transmitter remains tuned to the first network and transmits data or control signals.Type: GrantFiled: March 15, 2013Date of Patent: December 1, 2015Assignee: QUALCOMM IncorporatedInventors: Chih-Ping Hsu, Farrukh Usmani, Ling Hang, Rajagopal Jeenagala
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Publication number: 20150296520Abstract: Various embodiments for improving acquisition of services in multi-SIM mobile devices by using modified priorities for radio access technologies (RATs) in partial out-of-service conditions include determining when a first radio access technology (RAT) within a plurality of RATs begins to use a shared resource within the multi-SIM mobile device that is configured to be utilized by the plurality of RATs, determining whether a second RAT within the plurality of RATs was in-service or out of service at the time when the first RAT began using the shared resource, calculating a modified priority value for the second RAT in response to determining that the second RAT was in-service at the time, and determining an order for subsequent scanning for the services by the plurality of RATs based on the calculated modified priority value for the second RAT when the second RAT in-service at the time.Type: ApplicationFiled: April 11, 2014Publication date: October 15, 2015Applicant: QUALCOMM IncorporatedInventors: Bhaskara Viswanadham Batchu, Mihir Pravin Nabar, Ling Hang, Anand Rajurkar
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Patent number: 9131061Abstract: An audio gateway device may establish a wireless connection between the audio gateway device and the hands free device using a protocol supporting a single subscription. The audio gateway device may also establish a first call which terminates or originates at the hands free device via a first subscription. An outgoing call may be established via a second subscription by: (a) receiving a first indicator from the hands free device to switch subscriptions, where the first indicator does not specify a subscription; and (b) establishing an originating second call via the second subscription which originates at the hands free device. Similarly, an incoming call may be established via the second subscription by: (a) sending a second indicator to the hands free device of an incoming third call, where the second indicator does not specify a subscription; and (b) establishing the third call via the second subscription which terminates at the hands free device.Type: GrantFiled: January 6, 2014Date of Patent: September 8, 2015Assignee: QUALCOMM IncorporatedInventors: Abhijeet Sinha, Atul Shukla, Nitin Sachdeva, Nitin Srivastava, Mallikarjuna Giriyapura Basavarajappa, Srikanth Chintala, Hanumanthu Ganji, Sandeep Gutta, Yau Mo Chan, Ling Hang
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Publication number: 20150195393Abstract: An audio gateway device may establish a wireless connection between the audio gateway device and the hands free device using a protocol supporting a single subscription. The audio gateway device may also establish a first call which terminates or originates at the hands free device via a first subscription. An outgoing call may be established via a second subscription by: (a) receiving a first indicator from the hands free device to switch subscriptions, where the first indicator does not specify a subscription; and (b) establishing an originating second call via the second subscription which originates at the hands free device. Similarly, an incoming call may be established via the second subscription by: (a) sending a second indicator to the hands free device of an incoming third call, where the second indicator does not specify a subscription; and (b) establishing the third call via the second subscription which terminates at the hands free device.Type: ApplicationFiled: January 6, 2014Publication date: July 9, 2015Applicant: QUALCOMM IncorporatedInventors: Abhijeet Sinha, Atul Shukla, Nitin Sachdeva, Nitin Srivastava, Mallikarjuna Giriyapura Basavarajappa, Srikanth Chintala, Hanumanthu Ganji, Sandeeps Gutta, Yau Mo Chan, Ling Hang
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Patent number: 9066330Abstract: Methods, systems and devices are provided for controlling a communication device. Embodiments include receiving, through the transceiver, a voice call from a first network subscription associated with a first SIM of the communication device. The voice call may interrupt an active data services session through the transceiver with a second network subscription associated with a second SIM of the communication device. Also, embodiments include establishing an active voice communication connection for the voice call on the transceiver with the first network subscription. Additionally, reestablishing the active data services session through the transceiver with the first network subscription while maintaining the active voice communication connection for the voice call with the first network subscription.Type: GrantFiled: September 30, 2013Date of Patent: June 23, 2015Assignee: QUALCOMM IncorporatedInventors: Ling Hang, Chih-Ping Hsu
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Publication number: 20150119103Abstract: Methods, systems and devices for prioritizing communication technologies to allocate resources in a mobile device. The mobile device may employ a dual subscription, dual active (DSDA) configuration in which two subscriptions may be associated with concurrently active communications, such as voice or data calls. The mobile device may identify current states that indicate the type of communications associated with the subscriptions. In an embodiment, an applications processor within the mobile device may perform the state identifications. The mobile device may determine priorities of the concurrently active subscriptions based on the identified states. In an embodiment, the priorities may be determined by a modem processor within the mobile device. When the priorities are determined to be the same, the mobile device may perform a tiebreaker algorithm to further identify priorities. Based on the determined priorities, the mobile device may allocate resources to favor the subscription with the higher priority.Type: ApplicationFiled: October 29, 2013Publication date: April 30, 2015Applicant: QUALCOMM IncorporatedInventors: Francis Ming-Meng NGAI, Reza Shahidi, Amit Mahajan, Sridhar Bandaru, Ashish Gaonekar, Jeffrey Niemann, Henri Felix Begin, Ling Hang, Srikanth Chintala, Shivank Nayak
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Publication number: 20150094071Abstract: Methods, systems and devices are provided for controlling a communication device. Embodiments include receiving, through the transceiver, a voice call from a first network subscription associated with a first SIM of the communication device. The voice call may interrupt an active data services session through the transceiver with a second network subscription associated with a second SIM of the communication device. Also, embodiments include establishing an active voice communication connection for the voice call on the transceiver with the first network subscription. Additionally, reestablishing the active data services session through the transceiver with the first network subscription while maintaining the active voice communication connection for the voice call with the first network subscription.Type: ApplicationFiled: September 30, 2013Publication date: April 2, 2015Applicant: QUALCOMM IncorporatedInventors: Ling Hang, Chih-Ping Hsu
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Patent number: 8873469Abstract: To reduce latency in accessing a wireless communication system, which is highly desirable for time sensitive applications such as push-to-talk call, a wireless device performs an overhead update procedure and a transmit clock synchronization procedure in parallel. The overhead update procedure obtains up-to-date overhead information from the system, such as access parameters used to access the system. The transmit clock synchronization procedure updates transmit timing to current system time, e.g., resets a long or scrambling code and pseudo-random number (PN) sequences used to transmit signaling to the system. After the overhead information has been updated and the transmit clock synchronization procedure has been completed, the wireless device performs an access probe procedure to send signaling (or access probes) to the system to attempt to access the system.Type: GrantFiled: June 30, 2004Date of Patent: October 28, 2014Assignee: QUALCOMM IncorporatedInventor: Ling Hang
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Publication number: 20140274051Abstract: Various embodiments include methods, systems, and devices for tuning away a mobile device's receiver without retuning the mobile device's transmitter, thereby allowing the mobile device to monitor multiple networks with a single radio frequency (RF) chain while avoiding the problems often associated with tune-away methods, such as loss of throughput, loss of tracking or synchronization, delays in acknowledgments, delays in rate control or channel quality control feedback, etc. The transmitter may remain tuned to a first network while the receiver may be separately tuned to one or more other networks. In various embodiments, the separately tuned receiver may monitor for paging signals on one or more networks while the transmitter remains tuned to the first network and transmits data or control signals.Type: ApplicationFiled: March 15, 2013Publication date: September 18, 2014Applicant: QUALCOMM INCORPORATEDInventors: Chih-Ping HSU, Farrukh USMANI, Ling HANG, Rajagopal JEENAGALA
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Patent number: 8738021Abstract: A particular method includes receiving first data via a first network at a device that is configured to receive the first data via the first network based on a first wireless communication subscription and is configured to receive second data via a second network based on a second wireless communication subscription. The method also includes while receiving the first data, determining that a tuneaway period associated with the second network has passed, where the tuneaway period is longer than a discontinuous reception (DRX) cycle length associated with the second network. The method further includes tuning a receiver of the device to a paging channel of the second network in response to passing of the tuneaway period.Type: GrantFiled: January 23, 2012Date of Patent: May 27, 2014Assignee: Qualcomm IncorporatedInventors: Subbarayudu Mutya, Debesh Kumar Sahu, Ling Hang, Chih-Ping Hsu, Shawn C. Morrison
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Patent number: 8428593Abstract: A method of enabling soft handoff between base stations using different signaling frame formats allows soft handoff from an origination base station supporting a lower Protocol Data Unit revision format to an alternative base station supporting a higher Protocol Data Unit revision format, as well as soft handoff between an origination base station supporting a higher Protocol Data Unit revision format to an alternative base station supporting a lower Protocol Data Unit revision format. The base station using the higher Protocol Data Unit revision format downgrades to the lower Protocol Data Unit revision format for the duration of soft handoff. As all base stations use the same Protocol Data Unit revision format during soft handoff, the signals from all of the receive paths can be combined by a mobile station.Type: GrantFiled: February 4, 2008Date of Patent: April 23, 2013Assignee: QUALCOMM IncorporatedInventors: Jun Wang, Ling Hang
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Publication number: 20130023275Abstract: A particular method includes receiving first data via a first network at a device that is configured to receive the first data via the first network based on a first wireless communication subscription and is configured to receive second data via a second network based on a second wireless communication subscription. The method also includes while receiving the first data, determining that a tuneaway period associated with the second network has passed, where the tuneaway period is longer than a discontinuous reception (DRX) cycle length associated with the second network. The method further includes tuning a receiver of the device to a paging channel of the second network in response to passing of the tuneaway period.Type: ApplicationFiled: January 23, 2012Publication date: January 24, 2013Applicant: QUALCOMM INCORPORATEDInventors: Subbarayudu Mutya, Debesh Kumar Sahu, Ling Hang, Chih-Ping Hsu, Shawn C. Morrison
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CDMA frequency acquisition using a simplified crystal oscillator that is not temperature compensated
Patent number: 8144821Abstract: CDMA code channels are acquired using a crystal oscillator that is not temperature compensated and that generates a tuning signal with relatively large frequency error (e.g., +/?5 ppm). Channel acquisition is first attempted at no offset from a start frequency that is obtained by fitting an ideal temperature/frequency error curve to available actual data points. Following unsuccessful pilot acquisition, the offset frequency is stepped in a “spiral” manner, and pilot acquisition is retried. When the pilot and synchronization channels are successfully acquired, but the system identification is unexpected, an adjacent channel image has been acquired, and the offset frequency is bumped by a large step (e.g., 15 kHz). Pilot acquisition is retried using spiral stepping. The crystal oscillator is calibrated after each successful acquisition of the pilot, synchronization and paging channels by retaining a data point in a frequency adjustment table for the temperature at which frequency acquisition was successful.Type: GrantFiled: January 5, 2006Date of Patent: March 27, 2012Assignee: QUALCOMM IncorporatedInventors: James A. Hutchison, IV, Ling Hang, Robbin D. Hughes -
Patent number: 7475323Abstract: A higher layer at a base station generates and passes messages to Layer 2, which generates and appends a CRC value to each message. The messages are encapsulated in frames at the physical layer, which generates and appends a CRC value to each frame. The base station transmits the frames on a control channel. The physical layer at a wireless device processes the control channel and decodes each received frame to obtain a decoded frame. The physical layer forwards the decoded frame to Layer 2, regardless of whether the frame passes or fails a CRC test. Layer 2 processes the decoded frame, even if the decoded frame fails the CRC test, to extract messages sent in the decoded frame. Layer 2 checks each extracted message based on its CRC value and forwards each message that passes the CRC test to the higher layer.Type: GrantFiled: February 9, 2005Date of Patent: January 6, 2009Assignee: Qualcomm IncorporatedInventors: Ling Hang, Bao Nguyen
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Publication number: 20080159202Abstract: To reduce latency in accessing a wireless communication system, which is highly desirable for time sensitive applications such as push-to-talk call, a wireless device performs an overhead update procedure and a transmit clock synchronization procedure in parallel. The overhead update procedure obtains up-to-date overhead information from the system, such as access parameters used to access the system. The transmit clock synchronization procedure updates transmit timing to current system time, e.g., resets a long or scrambling code and pseudo-random number (PN) sequences used to transmit signaling to the system. After the overhead information has been updated and the transmit clock synchronization procedure has been completed, the wireless device performs an access probe procedure to send signaling (or access probes) to the system to attempt to access the system.Type: ApplicationFiled: June 30, 2004Publication date: July 3, 2008Inventor: Ling Hang
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Publication number: 20080146239Abstract: A method of enabling soft handoff between base stations using different signaling frame formats allows soft handoff from an origination base station supporting a lower Protocol Data Unit revision format to an alternative base station supporting a higher Protocol Data Unit revision format, as well as soft handoff between an origination base station supporting a higher Protocol Data Unit revision format to an alternative base station supporting a lower Protocol Data Unit revision format. The base station using the higher Protocol Data Unit revision format downgrades to the lower Protocol Data Unit revision format for the duration of soft handoff. As all base stations use the same Protocol Data Unit revision format during soft handoff, the signals from all of the receive paths can be combined by a mobile station.Type: ApplicationFiled: February 4, 2008Publication date: June 19, 2008Applicant: QUALCOMM INCORPORATEDInventors: Jun Wang, Ling Hang
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Patent number: 7336954Abstract: A method of enabling soft handoff between base stations using different signaling frame formats allows soft handoff from an origination base station supporting a lower Protocol Data Unit revision format to an alternative base station supporting a higher Protocol Data Unit revision format, as well as soft handoff between an origination base station supporting a higher Protocol Data Unit revision format to an alternative base station supporting a lower Protocol Data Unit revision format. The base station using the higher Protocol Data Unit revision format downgrades to the lower Protocol Data Unit revision format for the duration of soft handoff. As all base stations use the same Protocol Data Unit revision format during soft handoff, the signals from all of the receive paths can be combined by a mobile station.Type: GrantFiled: May 17, 2002Date of Patent: February 26, 2008Assignee: Qualcomm IncorporatedInventors: Jun Wang, Ling Hang
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CDMA frequency acquisition using a simplified crystal oscillator that is not temperature compensated
Publication number: 20070030887Abstract: CDMA code channels are acquired using a crystal oscillator that is not temperature compensated and that generates a tuning signal with relatively large frequency error (e.g., +/?5 ppm). Channel acquisition is first attempted at no offset from a start frequency that is obtained by fitting an ideal temperature/frequency error curve to available actual data points. Following unsuccessful pilot acquisition, the offset frequency is stepped in a “spiral” manner, and pilot acquisition is retried. When the pilot and synchronization channels are successfully acquired, but the system identification is unexpected, an adjacent channel image has been acquired, and, the offset frequency is bumped by a large step (e.g., 15 kHz). Pilot acquisition is retried using spiral stepping. The crystal oscillator is calibrated after each successful acquisition of the pilot, synchronization and paging channels by retaining a data point in a frequency adjustment table for the temperature at which frequency acquisition was successful.Type: ApplicationFiled: January 5, 2006Publication date: February 8, 2007Inventors: James Hutchison, Ling Hang, Robbin Hughes