Patents by Inventor Jiangxin Chen

Jiangxin Chen 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: 8139518
    Abstract: A system for measuring a rise-over-thermal (RoT) characteristic in a communication network includes controlling a transmitting station to maintain its transmit power at a substantially constant level for a first time interval, and measuring a first received power level. The transmitting station is then controlled to adjust its transmit power by a selectable amount for a second time interval, and a second received power level is measured. The first and second received power levels are then processed to determine the RoT characteristic.
    Type: Grant
    Filed: July 12, 2005
    Date of Patent: March 20, 2012
    Assignee: Qualcomm Incorporated
    Inventors: Luca Blessent, Jiangxin Chen, Farrokh Abrishamkar
  • Patent number: 7773992
    Abstract: Interoperability between wireless communication systems, such as the IS2000-1x and IS856 systems, is facilitated by using supervision timers. A wireless communication device starts one or more supervision timers and performs an intersystem transition. When the wireless communication device returns from the transition, the supervision timers are used to estimate the duration of the transition. The wireless communication device then performs a sequence of tasks appropriate to the estimated duration.
    Type: Grant
    Filed: February 7, 2008
    Date of Patent: August 10, 2010
    Assignee: QUALCOMM Incorporated
    Inventors: Serguei A. Glazko, Subbarao Yallapragada, Jiangxin Chen
  • Publication number: 20080125168
    Abstract: Interoperability between wireless communication systems, such as the IS2000-1x and IS856 systems, is facilitated by using supervision timers. A wireless communication device starts one or more supervision timers and performs an intersystem transition. When the wireless communication device returns from the transition, the supervision timers are used to estimate the duration of the transition. The wireless communication device then performs a sequence of tasks appropriate to the estimated duration.
    Type: Application
    Filed: February 7, 2008
    Publication date: May 29, 2008
    Applicant: QUALCOMM INCORPORATED
    Inventors: Serguei A. Glazko, Subbarao Yallapragada, Jiangxin Chen
  • Patent number: 7330735
    Abstract: Interoperability between wireless communication systems, such as the IS2000-1x and IS856 systems, is facilitated by using supervision timers. A wireless communication device starts one or more supervision timers and performs an intersystem transition. When the wireless communication device returns from the transition, the supervision timers are used to estimate the duration of the transition. The wireless communication device then performs a sequence of tasks appropriate to the estimated duration.
    Type: Grant
    Filed: January 31, 2002
    Date of Patent: February 12, 2008
    Assignee: Qualcomm Incorporated
    Inventors: Serguei A. Glazko, Subbarao Yallapragada, Jiangxin Chen
  • Publication number: 20060045045
    Abstract: A system for measuring a rise-over-thermal (RoT) characteristic in a communication network includes controlling a transmitting station to maintain its transmit power at a substantially constant level for a first time interval, and measuring a first received power level. The transmitting station is then controlled to adjust its transmit power by a selectable amount for a second time interval, and a second received power level is measured. The first and second received power levels are then processed to determine the RoT characteristic.
    Type: Application
    Filed: July 12, 2005
    Publication date: March 2, 2006
    Inventors: Luca Blessent, Jiangxin Chen, Farrokh Abrishamkar
  • Patent number: 6650912
    Abstract: A quick paging channel (QPCH) is used to receive paging indicators that indicate that a wireless communication device (WCD) has a message on a paging channel relating to, for example, an incoming call to the WCD. When the condition of the quick paging channel is too low to receive paging indicators reliably, the quick paging channel is disabled to avoid false alarms, and the slotted paging channel is used to receive paging messages without monitoring the QPCH. When the QPCH signal is strong, the probability of false alarms is lower, and the quick paging channel is enabled. By using the quick paging channel to receive paging indicators only when the QPCH signal is strong, the wireless communication device can remain in a sleep state for greater periods of time as compared with the use of a slotted paging channel. As a result, standby time may be significantly improved.
    Type: Grant
    Filed: September 18, 2001
    Date of Patent: November 18, 2003
    Assignee: Qualcomm, Incorporated
    Inventors: Jiangxin Chen, Arthur Neufeld, Serguei Glazko, Messay Amerga
  • Patent number: 6650873
    Abstract: A wireless communication device performance, such as standby time, is improved by adaptively allocating surplus system resources to change quick paging channel parameters at the system, such a system being for example, a base station. Adaptively adjusting the quick paging channel parameters allows available base station resources to be allocated to the quick paging channel, thereby enabling the wireless communication device to demodulate the quick paging channel more reliably. Parameters such as the number of quick paging channels, the data rate used by the paging channel, and the quick paging channel transmit power level are weighed and adjusted.
    Type: Grant
    Filed: March 16, 2001
    Date of Patent: November 18, 2003
    Assignee: Qualcomm, Incorporated
    Inventors: Jiangxin Chen, Christopher Riddle, Serguei Glazko
  • Publication number: 20030144000
    Abstract: Interoperability between wireless communication systems, such as the IS2000-1x and IS856 systems, is facilitated by using supervision timers. A wireless communication device starts one or more supervision timers and performs an intersystem transition. When the wireless communication device returns from the transition, the supervision timers are used to estimate the duration of the transition. The wireless communication device then performs a sequence of tasks appropriate to the estimated duration.
    Type: Application
    Filed: January 31, 2002
    Publication date: July 31, 2003
    Inventors: Serguei A. Glazko, Subbarao Yallapragada, Jiangxin Chen
  • Publication number: 20030008691
    Abstract: A quick paging channel (QPCH) is used to receive paging indicators that indicate that a wireless communication device (WCD) has a message on a paging channel relating to, for example, an incoming call to the WCD. When the condition of the quick paging channel is too low to receive paging indicators reliably, the quick paging channel is disabled to avoid false alarms, and the slotted paging channel is used to receive paging messages without monitoring the QPCH. When the QPCH signal is strong, the probability of false alarms is lower, and the quick paging channel is enabled. By using the quick paging channel to receive paging indicators only when the QPCH signal is strong, the wireless communication device can remain in a sleep state for greater periods of time as compared with the use of a slotted paging channel. As a result, standby time may be significantly improved.
    Type: Application
    Filed: September 18, 2001
    Publication date: January 9, 2003
    Inventors: Jiangxin Chen, Arthur Neufeld, Serguei Glazko, Messay Amerga
  • Publication number: 20020132586
    Abstract: A wireless communication device performance, such as standby time, is improved by adaptively allocating surplus system resources to change quick paging channel parameters at the system, such a system being for example, a base station. Adaptively adjusting the quick paging channel parameters allows available base station resources to be allocated to the quick paging channel, thereby enabling the wireless communication device to demodulate the quick paging channel more reliably. Parameters such as the number of quick paging channels, the data rate used by the paging channel, and the quick paging channel transmit power level are weighed and adjusted.
    Type: Application
    Filed: March 16, 2001
    Publication date: September 19, 2002
    Inventors: Jiangxin Chen, Christopher Riddle, Serguei Glazko