Patents by Inventor Masoud Olfat

Masoud Olfat 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: 7843870
    Abstract: Systems and methods for supporting multiple wireless communications technologies are provided. When a first and second base station operate according to different wireless communication technologies on the same carrier frequency in different cells or on different carrier frequencies in the same cell the frame structure of each base station is controlled in such a way that idle periods of transmissions from one base station are aligned with idle periods of the other base station. When the first and second base stations are located in the same cell and operate on the same carrier frequency the frames of the first and second base stations are time-interlaced.
    Type: Grant
    Filed: November 7, 2006
    Date of Patent: November 30, 2010
    Assignee: Clear Wireless LLC
    Inventor: Masoud Olfat
  • Publication number: 20100281322
    Abstract: A system and method of increasing data throughput in a wireless communications network between a base station (BS) and one or more mobile stations (MS) includes establishing a service flow (SF) and initially enabling a hybrid automated repeat request (HARQ) protocol; determining, at a particular time, the measure of quality of the communications channel; comparing the determined measure of quality with a predetermined channel quality threshold; and selectively disabling the HARQ protocol based upon a first comparison result while continuing the SF between the BS and MS. In other aspects, after selectively disabling the HARQ protocol, the method further includes determining that the time-varying measure of quality of the communications channel has deteriorated below the predetermined channel quality threshold; and selectively re-enabling the HARQ protocol in the established SF.
    Type: Application
    Filed: May 1, 2009
    Publication date: November 4, 2010
    Applicant: CLEAR WIRELESS, LLC
    Inventors: Sungki PARK, Masoud OLFAT, Dhaval Dipak MEHTA
  • Publication number: 20100278160
    Abstract: A system and method a hybrid scheme of mode decision in a network having a plurality of mobile stations communicably coupled to a base station may include a mode decision module associated with the base station. The mode decision module may include one or more processors configured to select a first mode configuration for use during transmission of a first communication from the base station, receive first feedback information comprising a first mode recommendation and first channel information, identify a first system state of the first communication based at least in part on the first condition information, determine whether to use the first mode recommendation configuration based at least in part on the first system state, and configure the second communication using a second mode configuration based on the determination.
    Type: Application
    Filed: May 1, 2009
    Publication date: November 4, 2010
    Applicant: CLEAR WIRELESS, LLC
    Inventors: Sungki PARK, Masoud OLFAT, Dhaval Dipak MEHTA
  • Publication number: 20100278103
    Abstract: A system and method for adaptive control of an averaging parameter in a communications network may include an averaging parameter adaptive control module (APAC) that is associated with a base station and that includes one or more processors configured to generate a first averaging parameter that is transmitted by the base station to a mobile station communicating with the base station. The mobile station may use the first averaging parameter to generate first channel condition information that indicates a condition of a communication channel. First feedback information including the first channel condition information may be received at the base station. The APAC may generate a second averaging parameter using the first averaging parameter and the first feedback information and may transmit the second averaging parameter from the base station to the mobile station, thereby adaptively controlling the second averaging parameter based on the first feedback information.
    Type: Application
    Filed: May 1, 2009
    Publication date: November 4, 2010
    Applicant: CLEAR WIRELESS, LLC
    Inventors: Sungki PARK, Masoud OLFAT, Dhaval Dipak MEHTA
  • Patent number: 7796547
    Abstract: Methods and apparatus for notifying mobile stations in an inactive state of the presence of uplink or downlink channel configuration, broadcast system updates, traffic channel allocations and paging messages are provided. The notification can be provided in an information element in the same channel as the frame, or in a different channel. The information element identifies a subsequent frame which includes broadcast or configuration changes. The notifications for traffic channel allocations can include a first field, which identifies whether there are any traffic channel allocations for any sleep mode mobile station, and a second field for identifying the particular sleep mode mobile stations which are to receive traffic channel allocations. Notifications for paging messages can include a field, which identifies whether there are any paging messages for any idle mode mobile stations, and use second field to identify the particular idle mode mobile stations, which are to receive the paging messages.
    Type: Grant
    Filed: July 28, 2005
    Date of Patent: September 14, 2010
    Assignee: Nextel Communications Inc.
    Inventors: Kamran Etemad, Masoud Olfat
  • Patent number: 7751363
    Abstract: Systems and methods for allocating traffic and associated control channels are provided. A downlink traffic control message can include an identification of a downlink traffic channel and an identification of an associated uplink control channel. An uplink traffic control message can include an identification of an uplink traffic channel and an identification of an associated downlink control channel in a frame subsequent to the frame of the uplink traffic channel. The associated control channels can be a feedback channel, which can provide power control information, retransmission request information, channel quality indication information and/or the like.
    Type: Grant
    Filed: November 22, 2005
    Date of Patent: July 6, 2010
    Assignee: Nextel Communications Inc.
    Inventors: Kamran Etemad, Masoud Olfat
  • Publication number: 20100105393
    Abstract: A system and method for handoff are provided. A mobile station performs a make-before-break handoff of a control channel between a serving and target base station and a break-before-make handoff of a traffic channel between the serving and target base stations. The traffic channel handoff is performed after the control channel handoff has completed.
    Type: Application
    Filed: December 30, 2009
    Publication date: April 29, 2010
    Applicant: NEXTEL COMMUNICATIONS, INC.
    Inventors: Kamran ETEMAD, Masoud Olfat
  • Patent number: 7693517
    Abstract: A system and method for handoff are provided. A mobile station performs a make-before-break handoff of a control channel between a serving and target base station and a break-before-make handoff of a traffic channel between the serving and target base stations. The traffic channel handoff is performed after the control channel handoff has completed.
    Type: Grant
    Filed: August 9, 2005
    Date of Patent: April 6, 2010
    Assignee: Nextel Communications Inc.
    Inventors: Kamran Etemad, Masoud Olfat
  • Publication number: 20080107047
    Abstract: Systems and methods for supporting multiple wireless communications technologies are provided. When a first and second base station operate according to different wireless communication technologies on the same carrier frequency in different cells or on different carrier frequencies in the same cell the frame structure of each base station is controlled in such a way that idle periods of transmissions from one base station are aligned with idle periods of the other base station. When the first and second base stations are located in the same cell and operate on the same carrier frequency the frames of the first and second base stations are time-interlaced.
    Type: Application
    Filed: November 7, 2006
    Publication date: May 8, 2008
    Applicant: Nextel Communications, Inc.
    Inventor: Masoud Olfat
  • Publication number: 20080108367
    Abstract: Systems and methods for supporting multiple wireless communication technologies within a cell are provided. A base station can transmit a second wireless communication technology in a smaller coverage than the coverage of the first wireless communication technology, thereby producing an underlay-overlay cell radiation pattern. Whether a mobile station communicates with the base station using the first or second wireless communication technology can be based on a comparison of signal quality measures for the mobile station, or any other performance metric with a fixed or dynamic threshold.
    Type: Application
    Filed: November 8, 2006
    Publication date: May 8, 2008
    Applicant: Nextel Communications, Inc.
    Inventors: Alireza Afrashteh, Masoud Olfat, Douglas A. Hyslop, Rajesh M. Gangadhar
  • Publication number: 20080062914
    Abstract: Systems and methods for allocating radio frequency resources are provided. The radio frequency resources are allocated to a mobile station in time or frequency alignment based on signal quality measures. In an orthogonal frequency division multiple access system, the allocated radio frequency resources include one or more tones and one or more symbols.
    Type: Application
    Filed: September 8, 2006
    Publication date: March 13, 2008
    Applicant: Nextel Communications, Inc.
    Inventor: Masoud Olfat
  • Publication number: 20080051086
    Abstract: A system and method for handoff are provided. A mobile station performs a make-before-break handoff of a control channel between a serving and target base station and a break-before-make handoff of a traffic channel between the serving and target base stations. The traffic channel handoff is performed after the control channel handoff has completed.
    Type: Application
    Filed: August 9, 2005
    Publication date: February 28, 2008
    Applicant: Nextel Communications, Inc.
    Inventors: Kamran Etemad, Masoud Olfat
  • Publication number: 20070248043
    Abstract: A method, computer-readable medium, and apparatus for dynamically assigning radio resources between a frequency division duplexing (FDD) carrier and a time division duplexing (TDD) carrier is provided. The method includes monitoring radio frequency conditions and traffic load of the FDD and TDD carriers; allocating a resource assignment for a downlink on the FDD carrier or the TDD carrier, based upon the radio frequency conditions or the traffic load of the FDD and TDD carriers; and allocating a resource assignment for an uplink on the FDD carrier or the TDD carrier, based upon the radio frequency conditions or the traffic load of the FDD and TDD carriers.
    Type: Application
    Filed: April 20, 2006
    Publication date: October 25, 2007
    Applicant: NEXTEL COMMUNICATIONS, INC.
    Inventors: Alireza Afrashteh, Masoud Olfat, Douglas Hyslop, Rajesh Gangadhar
  • Publication number: 20070230414
    Abstract: A method, apparatus, and computer-readable medium for performing asymmetric frequency division duplexing (FDD) are provided. The method includes allocating a first bandwidth for an uplink portion of an FDD data transmission; and allocating a second bandwidth for a downlink portion of the FDD data transmission; wherein the first bandwidth and the second bandwidth have different sizes.
    Type: Application
    Filed: March 31, 2006
    Publication date: October 4, 2007
    Applicant: NEXTEL COMMUNICATIONS, INC.
    Inventors: Alireza Afrashteh, Masoud Olfat, Douglas Hyslop, Rajesh Gangadhar
  • Publication number: 20070025290
    Abstract: Systems and methods for communicating between a wireless station and a base station are provided. A base station can allocate both a TDD channel and an FDD channel pair for communicating with a wireless station. The base station can transmit and receive unicast messages using the time slots of the TDD channel or can transmit multicast messages over all time slots of the TDD channel.
    Type: Application
    Filed: July 29, 2005
    Publication date: February 1, 2007
    Applicant: NEXTEL COMMUNICATIONS, INC.
    Inventors: Alireza Afrashteh, Masoud Olfat, Douglas Hyslop, Rajesh Gangadhar
  • Publication number: 20070025291
    Abstract: Systems and methods for enhancing the capacity of base stations are provided. A base station can operate in a time division duplex mode within a first frequency band. When a second frequency band is acquired for the base station's geographic region, a duplexer can be added to the base station. The base station can then operate in a frequency division duplex mode, where the first frequency band is used for base station downlink transmissions and the second frequency band is used for uplink transmissions.
    Type: Application
    Filed: July 29, 2005
    Publication date: February 1, 2007
    Applicant: NEXTEL COMMUNICATIONS, INC.
    Inventors: Alireza Afrashteh, Masoud Olfat, Douglas Hyslop, Rajesh Gangadhar
  • Publication number: 20060050627
    Abstract: A system and method for multiplexing subchannels in an OFDMA network is provided. The subchannels can be multiplexed by splitting the subchannels in the frequency domain. Alternatively, the subchannels can be code division multiplexed using N orthogonal spreading codes. The subchannel multiplexing increases system capacity for low-rate services, such as voice-based services.
    Type: Application
    Filed: August 5, 2005
    Publication date: March 9, 2006
    Applicant: NEXTEL COMMUNICATIONS, INC.
    Inventors: Kamran Etemad, Masoud Olfat
  • Publication number: 20060035639
    Abstract: A system and method for handoff are provided. A mobile station performs a make-before-break handoff of a control channel between a serving and target base station and a break-before-make handoff of a traffic channel between the serving and target base stations. The traffic channel handoff is performed after the control channel handoff has completed.
    Type: Application
    Filed: August 9, 2005
    Publication date: February 16, 2006
    Applicant: NEXTEL COMMUNICATIONS, INC.
    Inventors: Kamran Etemad, Masoud Olfat
  • Publication number: 20060029011
    Abstract: Methods and apparatus for notifying mobile stations in an inactive state of the presence of uplink or downlink channel configuration, broadcast system updates, traffic channel allocations and paging messages are provided. The notification can be provided in an information element in the same channel as the frame, or in a different channel. The information element identifies a subsequent frame which includes broadcast or configuration changes. The notifications for traffic channel allocations can include a first field, which identifies whether there are any traffic channel allocations for any sleep mode mobile station, and a second field for identifying the particular sleep mode mobile stations which are to receive traffic channel allocations. Notifications for paging messages can include a field, which identifies whether there are any paging messages for any idle mode mobile stations, and use second field to identify the particular idle mode mobile stations, which are to receive the paging messages.
    Type: Application
    Filed: July 28, 2005
    Publication date: February 9, 2006
    Applicant: NEXTEL COMMUNICATIONS, INC
    Inventors: Kamran Etemad, Masoud Olfat