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).

  • Publication number: 20120275388
    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: July 11, 2012
    Publication date: November 1, 2012
    Applicant: Clearwire IP Holdings LLC
    Inventors: Sungki PARK, Masoud Olfat, Dhaval Dipak Mehta
  • Publication number: 20120238315
    Abstract: Systems and methods for performing handover cancellation in a wireless communication system are provided. According to an aspect of the invention, a mobile station requests bandwidth from a serving base station for the mobile station to send a handover cancellation request message to the serving base station. The mobile station then receives an allocation of the requested bandwidth from the serving base station, and sends the handover cancellation request message to the serving base station via the allocated bandwidth. The mobile station requests the bandwidth after a disconnect time and before a resource retain time.
    Type: Application
    Filed: March 14, 2011
    Publication date: September 20, 2012
    Applicant: Clearwire IP Holdings LLC
    Inventors: Chunmei Liu, Masoud Olfat
  • Publication number: 20120239998
    Abstract: An apparatus and method of configuring a number of retransmissions for an automatic repeat request (ARQ) scheme (e.g., hybrid ARQ) includes configuring one or more first maximum retransmission numbers based on respective one or more first predetermined values and independent of a second maximum retransmission number. The first maximum retransmission numbers may indicate a maximum number of retransmissions related to respective service flows operational with the base station. The second maximum retransmission number may indicate a maximum number of retransmissions related to control messages transmitted in the wireless network, and may be configured based on a second predetermined value. The configuration of the first maximum retransmission numbers may include the maximum retransmissions numbers associated with a specific user in communication with the base station. Further, at least one of the first maximum retransmission numbers of a particular user may be reconfigured to a third predetermined value.
    Type: Application
    Filed: March 16, 2011
    Publication date: September 20, 2012
    Applicant: CLEAR WIRELESS LLC
    Inventors: Sungki PARK, Chunmei LIU, Masoud OLFAT
  • Publication number: 20120195241
    Abstract: In various embodiments, a system and method for providing uplink (UL) power control for a wireless mobile station (MS) includes, after transmission of an unanswered bandwidth request by the MS, incrementally boosting an UL transmit power of one or more subsequent bandwidth requests by the MS to a boosted UL power level at which UL bandwidth is allocated to the MS by the BS; selectively reporting the boosted UL power level to the BS immediately after the UL transmit power has been boosted; and selectively controlling the boosted UL power level by the BS responsive to the boosted UL power level reported to the BS. A MS is configured to carry out the UL power control method and a BS is configured to generate MS UL power control commands based, at least in part, upon the UL power level reported to the BS.
    Type: Application
    Filed: January 28, 2011
    Publication date: August 2, 2012
    Applicant: CLEAR WIRELESS, LLC
    Inventors: Chunmei LIU, Dhaval Dipak MEHTA, Sungki PARK, Masoud OLFAT, Durga Prasad SATAPATHY
  • Patent number: 8233434
    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: Grant
    Filed: May 1, 2009
    Date of Patent: July 31, 2012
    Assignee: Clearwire IP Holdings LLC
    Inventors: Sungki Park, Masoud Olfat, Dhaval Dipak Mehta
  • Patent number: 8204448
    Abstract: A first amount of bandwidth is allocated to a first wireless device to send signal quality information to a base station. Based on a first indicator of wireless link conditions associated with the first wireless device, and a second indicator of wireless link conditions associated with a second wireless device, a second amount of bandwidth is allocated to the first wireless device to send signal quality information to the base station.
    Type: Grant
    Filed: August 7, 2009
    Date of Patent: June 19, 2012
    Assignee: Clearwire IP Holdings LLC
    Inventors: Sungki Park, Masoud Olfat, Dhaval Dipak Mehta
  • Patent number: 8175032
    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: Grant
    Filed: September 8, 2006
    Date of Patent: May 8, 2012
    Assignee: Clearwire IP Holdings LLC
    Inventor: Masoud Olfat
  • Publication number: 20120020202
    Abstract: A method of operating a communication system comprises performing a plurality of ranging processes to establish a network connection over a wireless link. A time interval is established for a wireless device timer at the wireless device upon establishing the network connection and a time interval is established for an access node timer at the access node upon establishing the network connection. The method also comprises establishing a communication session over the wireless link and network connection. When a repeat request acknowledgement message is received during the communication session, the time interval for the wireless device timer and the time interval for the access node timer is restarted.
    Type: Application
    Filed: July 23, 2010
    Publication date: January 26, 2012
    Applicant: CLEAR WIRELESS LLC
    Inventors: Chunmei Liu, Masoud Olfat
  • Publication number: 20120014488
    Abstract: A method of operating a communication system comprises establishing a wireless device release time interval for a wireless device release timer at an access node upon establishing an initial network connection between a wireless device and the access node. An initial synchronization process is performed between the wireless device and the access node. The method continues with the access node sending an unsolicited synchronization message to the wireless device and starting the wireless device release timer. A second synchronization process is performed and upon successful completion of the second synchronization process, a success status synchronization response message is sent by the access node to the wireless device. The access node receives a synchronization confirmation message from the wireless device that comprises an identifier corresponding to the identity of the wireless device and upon receiving the confirmation message, the access node cancels the wireless device release timer.
    Type: Application
    Filed: July 13, 2010
    Publication date: January 19, 2012
    Applicant: CLEAR WIRELESS LLC
    Inventors: Chunmei LIU, Masoud Olfat
  • Publication number: 20120014489
    Abstract: A method of operating a communication system comprises sending a frame by an access node to a wireless device where the frame comprises a packet. A counter is initialized and a timer for each frame is initiated. The method continues with the access node determining if a response associated with the packet is received before the expiration of the timer. If the response is received prior to the expiration of the timer, the counter and the timer are reset. If a response is not received prior to the expiration of the timer, the counter is incremented. Upon the counter meeting a criteria of a certain quantity of lost packets, the access node performs a synchronization process.
    Type: Application
    Filed: July 13, 2010
    Publication date: January 19, 2012
    Applicant: CLEAR WIRELESS LLC
    Inventors: Chunmei LIU, Masoud Olfat, Nagi Mansour
  • Patent number: 8081600
    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: Grant
    Filed: July 29, 2005
    Date of Patent: December 20, 2011
    Assignee: Nextel Communications Inc.
    Inventors: Alireza Afrashteh, Masoud Olfat, Douglas A. Hyslop, Rajesh M. Gangadhar
  • Patent number: 8054783
    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: Grant
    Filed: August 5, 2005
    Date of Patent: November 8, 2011
    Assignee: Nextel Communications Inc.
    Inventors: Kamran Etemad, Masoud Olfat
  • Publication number: 20110255428
    Abstract: In one or more embodiments, a system and method of managing network channel quality in a wireless communications network includes reporting a channel quality measurement from the particular user to a base station (BS) over an available CQICH, and determining a MCS based, at least in part, upon the channel quality measurement. If a threshold network CQICH capacity is reached during a subsequent data frame such that a CQICH is no longer available, MAC level messages are generated between the BS and the particular user to trigger reporting of signal quality information to the BS by the particular user. After the next CQICH cycle commences and if a CQICH is still unavailable, the signal quality information is continued to be provided via MAC level messages. Otherwise, a CQICH is reallocated for a particular user and channel quality measurement reporting is transitioned back to the CQICH.
    Type: Application
    Filed: April 19, 2010
    Publication date: October 20, 2011
    Applicant: CLEAR WIRELESS, LLC
    Inventors: Sungki PARK, Masoud OLFAT
  • Patent number: 8031669
    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: Grant
    Filed: July 29, 2005
    Date of Patent: October 4, 2011
    Assignee: Nextel Communications Inc.
    Inventors: Alireza Afrashteh, Masoud Olfat, Douglas A. Hyslop, Rajesh M. Gangadhar
  • Patent number: 7961610
    Abstract: Methods and systems are provided for overload control in a wireless communication system. An overload control mechanism identifies an instance of use to eliminate from among a plurality of instances of use in a wireless coverage area. In an overload situation, the overload control mechanism may, for each instance of use, determine a respective ratio of the value of instance of use to the quantity of resource consumed by the instance of use. The overload control mechanism may then sort the instances of use in order of determined ratios to produce a sorted order of the instances of use. The overload control mechanism may select as many instances of use as possible, such that the total amount of resources consumed by the selected instances of use is as high as possible without exceeding the threshold load, and then the overload control mechanism may eliminate the remaining instances of use.
    Type: Grant
    Filed: April 3, 2008
    Date of Patent: June 14, 2011
    Assignee: Clear Wireless LLC
    Inventors: Masoud Olfat, Mohammad Hassan Partovi, Mehdi Alasti
  • Publication number: 20110038324
    Abstract: A method for varying pilot sub-carrier density in OFDMA communications is described. The method comprises calculating channel quality from sub-carriers; determining whether the channel quality is outside a threshold range; selecting a different pilot sub-carrier density for a sub-zone based on the value of the channel quality when the channel quality is outside the threshold range; and setting the sub-zone to the different pilot sub-carrier density. A system for using sub-zones with different pilot sub-carrier densities in OFDMA communications is also described.
    Type: Application
    Filed: August 11, 2009
    Publication date: February 17, 2011
    Inventors: Sungki Park, Masoud Olfat
  • Publication number: 20110034193
    Abstract: A first amount of bandwidth is allocated to a first wireless device to send signal quality information to a base station. Based on a first indicator of wireless link conditions associated with the first wireless device, and a second indicator of wireless link conditions associated with a second wireless device, a second amount of bandwidth is allocated to the first wireless device to send signal quality information to the base station.
    Type: Application
    Filed: August 7, 2009
    Publication date: February 10, 2011
    Applicant: Clear Wireless LLC
    Inventors: Sungki Park, Masoud Olfat, Dhaval Dipak Mehta
  • Publication number: 20110026455
    Abstract: A method of operating a communication system comprises exchanging initial communications between a wireless communication device and a communication network over a wireless connection between the wireless communication device and a network access system and a network connection between the wireless communication device and the communication network. The method further comprises performing a plurality of ranging processes to monitor a status of the wireless connection. Upon successfully completing a ranging process of the plurality of ranging processes, the method comprises determining a duration elapsed since the last successful ranging process and processing the duration to determine if the duration satisfies a criteria.
    Type: Application
    Filed: July 31, 2009
    Publication date: February 3, 2011
    Applicant: Clear Wireless LLC
    Inventors: Chunmei Liu, Masoud Olfat, Feng Huang, Mohammad Hassan Partovi, David S. McGinniss
  • Publication number: 20110026454
    Abstract: A method of operating a communication system comprises exchanging initial communications between a wireless communication device and a communication network over a wireless connection between the wireless communication device and a network access system and over a network connection between the wireless device and the communication network. The method further comprises, in response to a loss of the network connection due to a deterioration of the wireless connection, determining if a partial network entry process is possible to regain the connection, and if the partial network entry process is possible to regain the network connection, performing the partial network entry process. The method further comprises, in response to an improvement of the wireless connection and upon regaining the network connection, exchanging new communications between the wireless communication device and the communication network over the wireless connection and the network connection.
    Type: Application
    Filed: July 31, 2009
    Publication date: February 3, 2011
    Applicant: Clear Wireless LLC
    Inventors: Chunmei Liu, Masoud Olfat, Feng Huang, Mohammad Hassan Partovi, David S. McGinniss
  • Publication number: 20110010771
    Abstract: A plurality of ranging processes are performed to monitor a status of a wireless link associated with a device identifier. A ranging request that includes the device identifier and a message skip indicator is received. It is determined that the device identifier is already associated with the wireless link. A duration since a previously completed ranging process is determined. Based on the duration, and the message skip indicator, it is determined whether to respond to the ranging request.
    Type: Application
    Filed: July 10, 2009
    Publication date: January 13, 2011
    Applicant: Clear Wireless LLC
    Inventors: Masoud Olfat, Sungki Park, Dhaval Dipak Mehta