Patents by Inventor Prabhakar R. Chitrapu

Prabhakar R. Chitrapu 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: 7313393
    Abstract: Classes of cognition models which may include: 1) Radio Environment models, 2) Mobility models and 3) Application/User Context models are utilized in a wireless communications network. Radio Environment models represent the physical aspects of the radio environment, such as shadowing losses, multi-path propagation, interference and noise levels, etc. Mobility models represent users motion, in terms of geo-coordinates and/or logical identifiers, such as street names etc. as well as speed of user terminal etc. The context model represents the present state and dynamics of each of these application processes within itself and between multiple application processes. These data are employed to optimize network performance.
    Type: Grant
    Filed: July 7, 2006
    Date of Patent: December 25, 2007
    Assignee: InterDigital Technology Corporation
    Inventor: Prabhakar R. Chitrapu
  • Publication number: 20070211836
    Abstract: A method and apparatus for cancelling interference in received signals are disclosed. A receiver includes a knowledge-based interference cancellation unit, a blind interference cancellation unit and a trade-off management unit. The knowledge-based interference cancellation unit cancels interference in the received signals based on pre-known knowledge and the blind interference cancellation unit cancels interference in the received signals without the pre-known knowledge. The trade-off management unit determines a trade-off between knowledge-based interference cancellation and blind interference cancellation, whereby at least one of the knowledge-based interference cancellation and the blind interference cancellation is selectively preformed based on the trade-off. The interference cancellation may be performed by implementing at least one of a successive interference cancellation (SIC), a principal component analysis (PCA) and an independent component analysis (ICA).
    Type: Application
    Filed: September 13, 2006
    Publication date: September 13, 2007
    Applicant: INTERDIGITAL TECHNOLOGY CORPORATION
    Inventors: Prabhakar R. Chitrapu, Steven Jeffrey Goldberg
  • Patent number: 7251488
    Abstract: User traffic and signaling/control data are routed in wireless systems having an integrated wireless local area network and cellular network. The signaling/control data may include an alert of an incoming mobile terminated session that is transmitted to the user equipment based on the type of user equipment and the level of integration. User traffic is also routed to the user equipment based on the type of user equipment and the level of integration.
    Type: Grant
    Filed: June 20, 2003
    Date of Patent: July 31, 2007
    Assignee: InterDigital Technology Corporation
    Inventor: Prabhakar R. Chitrapu
  • Patent number: 7239874
    Abstract: A wireless network provides controlled wireless communications with multi-mode wireless WTRUs. The wireless network has at least one base station having a transceiver operating in an infrastructure communication mode with multi mode WTRUs and a controller that transmits control signals via infrastructure communications with a WTRU that control peer-to-peer mode communications of that WTRU with other WTRUs. A WTRU has transceiver components configured for selective operation in an infrastructure communication mode with a network base station and in a peer-to-peer communication mode with other WTRUs. The WTRU also has a transceiver controller configured to selectively control peer-to-peer mode communications with other WTRUs based on communication signals received in infrastructure communications with a network base station.
    Type: Grant
    Filed: March 2, 2006
    Date of Patent: July 3, 2007
    Assignee: Interdigital Technology Corporation
    Inventors: Gautam G. Reddy, Prabhakar R. Chitrapu, Leonid Kazakevich, Teresa Joanne Hunkeler, Arty Chandra
  • Patent number: 7231220
    Abstract: A method and system for wireless mobile unit communication within a wireless network having geographic areas for preferred communication usage is provided. An estimated geographic location of a mobile unit is determined. The mobile unit is provided with relative position data of at least one preferred communication area relative to the determined mobile unit estimated location. The mobile unit is then relocated to a preferred communication area based on the relative position data. Preferably, a request for a pre-designated preferred communication area location is initiated by a mobile unit transmission and received by a network base station. The mobile unit can be equipped with a global positioning system (GPS) to determine the mobile unit's estimated location. Transmission of estimated location data can be dependent upon whether the mobile unit or the network calculates relative position data.
    Type: Grant
    Filed: September 29, 2003
    Date of Patent: June 12, 2007
    Assignee: Interdigital Technology Corporation
    Inventors: Gautam G. Reddy, Prabhakar R. Chitrapu, Leonid Kazakevich, Teresa Joanne Hunkeler, Arty Chandra
  • Patent number: 7190808
    Abstract: Signals encoded with watermark information are generated and broadcast into a protected area for capture by illicit recording devices along with their intended targets. An illicit recording in which at least a portion of the broadcast watermark signals are recorded is obtained and correlated with a known position of the broadcast watermark signals to yield the location of illicit recording devices. In an alternate embodiment, a surveillance device, being image and time synchronized with a signal broadcasting device, monitors and records the protected area. Illicit recordings containing the broadcast watermark are obtained and correlated with corresponding recordings taken by the surveillance device to identify the location of illicit recording devices. In an alternate embodiment, the surveillance device further monitors the quality of the broadcast watermark signals and adjusts them accordingly to achieve a desired quality level.
    Type: Grant
    Filed: March 11, 2005
    Date of Patent: March 13, 2007
    Assignee: InterDigital Technology Corporation
    Inventors: Steven Jeffrey Goldberg, Richard Dan Herschaft, Alain Charles Louis Briancon, Prabhakar R. Chitrapu, Alan Gerald Carlton
  • Patent number: 7155208
    Abstract: A connection between a wireless transmit/receive unit (WTRU) and another node through a wireless network is established. The connection is used for communication. A user input is received. In response to the received user input, a communication through the connection is recoded while the WTRU still communicates the communication to a user of the WTRU. The recorded communication is retrieved and the recorded communication is communicated to the user at a later time.
    Type: Grant
    Filed: December 27, 2004
    Date of Patent: December 26, 2006
    Assignee: InterDigital Technology Corporation
    Inventor: Prabhakar R. Chitrapu
  • Patent number: 7136389
    Abstract: A system and method for supporting mobile Internet communication is provided which employs a plurality of Routers and a plurality of Mobile Nodes (MNs). Each Router has a unique communication address. Each MN is associated with a home Router. Each Router has an associated Mobile Node Location List identifying each MN for which the Router is the home Router and the communication address of a Router corresponding to a current location of each such MN. Each MN is movable from an old location where the MN communicates with the Internet via one Router to a current location where the MN communicates with the Internet via a different Router. Communication at the current location via the different Router is established by communicating to the MN's home Router the communication address of the different Router as the communication address corresponding to the MN's current location.
    Type: Grant
    Filed: February 20, 2002
    Date of Patent: November 14, 2006
    Assignee: InterDigital Technology Corporation
    Inventors: Sharif M. Shahrier, Prabhakar R. Chitrapu
  • Patent number: 7076246
    Abstract: Classes of cognition models which may include: 1) Radio Environment models, 2) Mobility models and 3) Application/User Context models are utilized in a wireless communications network. Radio Environment models represent the physical aspects of the radio environment, such as shadowing losses, multi-path propagation, interference and noise levels, etc. Mobility models represent users motion, in terms of geo-coordinates and/or logical identifiers, such as street names etc. as well as speed of user terminal etc. The context model represents the present state and dynamics of each of these application processes within itself and between multiple application processes. These data are employed to optimize network performance.
    Type: Grant
    Filed: March 2, 2004
    Date of Patent: July 11, 2006
    Assignee: InterDigital Technology Corporation
    Inventor: Prabhakar R. Chitrapu
  • Patent number: 7058405
    Abstract: A user equipment (UE) operating in a wireless system having at least one base station, communicates with base stations in neighboring wireless systems and conveys information regarding these neighboring wireless systems to the base station of its wireless system, which updates and stores this information for use in handover of UEs. The BS may also obtain updates directly from the base stations of neighboring wireless systems which may include a diversity of systems such as WLANS, Bluetooth, UMTS, GPRS, etc., and provide to UEs a list of those wireless systems which the UEs need not provide updates to the BS providing the list.
    Type: Grant
    Filed: April 12, 2004
    Date of Patent: June 6, 2006
    Assignee: InterDigital Technology Corporation
    Inventors: Arty Chandra, Prabhakar R. Chitrapu, Narayan Parappil Menon
  • Patent number: 7043247
    Abstract: Internet protocol version 6 (IPv6) is utilized throughout the entire cellular network and employs routing headers of the packets to ensure that the packets are routed via the gateway router (GR) to the end destination which is accomplished by a user equipment (UE) specifying the IP address of the gateway router as the IP address of an intermediate router in the routing header. Packets may also be routed to UEs from the GR through an intermediate router.
    Type: Grant
    Filed: December 23, 2002
    Date of Patent: May 9, 2006
    Assignee: InterDigital Technology corporation
    Inventor: Prabhakar R. Chitrapu
  • Patent number: 7039408
    Abstract: Method and apparatus for facilitating high level handoff decisions performed by a gateway device of a personal area network (PAN) which examines criteria regarding both the devices making up the PAN as well as the enterprise networks which are the subject of the potential handoff.
    Type: Grant
    Filed: May 29, 2003
    Date of Patent: May 2, 2006
    Assignee: InterDigital Technology Corporation
    Inventors: Prabhakar R. Chitrapu, Steven Jeffrey Goldberg
  • Patent number: 7016673
    Abstract: A wireless network provides controlled wireless communications with multi-mode wireless WTRUs. The wireless network has at least one base station having a transceiver operating in an infrastructure communication mode with multi mode WTRUs and a controller that transmits control signals via infrastructure communications with a WTRU that control peer-to-peer mode communications of that WTRU with other WTRUs. A WTRU has transceiver components configured for selective operation in an infrastructure communication mode with a network base station and in a peer-to-peer communication mode with other WTRUs. The WTRU also has a transceiver controller configured to selectively control peer-to-peer mode communications with other WTRUs based on communication signals received in infrastructure communications with a network base station.
    Type: Grant
    Filed: September 29, 2003
    Date of Patent: March 21, 2006
    Assignee: InterDigital Technology Corporation
    Inventors: Gautam G. Reddy, Prabhakar R. Chitrapu, Leonid Kazakevich, Teresa Joanne Hunkeler, Arty Chandra
  • Patent number: 7016702
    Abstract: The present invention relates to a method and system using dynamic beam forming for wireless communication signals in a wireless network. Base stations and/or UEs are provided with antenna systems having a range of beam forming selections. Relative base station and UE locations are one type of criteria used to make beam forming decisions.
    Type: Grant
    Filed: November 27, 2002
    Date of Patent: March 21, 2006
    Assignee: InterDigital Technology Corporation
    Inventor: Prabhakar R. Chitrapu
  • Patent number: 6999795
    Abstract: The present invention relates to a method and system using dynamic beam forming for wireless communication signals in a wireless network. Base stations and/or UEs are provided with antenna systems having a range of beam forming selections. Relative base station and UE locations are one type of criteria used to make beam forming decisions.
    Type: Grant
    Filed: November 27, 2002
    Date of Patent: February 14, 2006
    Assignee: InterDigital Technology Corporation
    Inventors: Prabhakar R. Chitrapu, Steven Jeffrey Goldberg
  • Patent number: 6993361
    Abstract: The present invention relates to a method and system using dynamic beam forming for wireless communication signals in a wireless network. Base stations and/or UEs are provided with antenna systems having a range of beam forming selections. Relative base station and UE locations are one type of criteria used to make beam forming decisions.
    Type: Grant
    Filed: November 27, 2002
    Date of Patent: January 31, 2006
    Assignee: InterDigital Technology Corporation
    Inventor: Prabhakar R. Chitrapu
  • Patent number: 6968185
    Abstract: A method for adjusting the operating parameters of a wireless device for use in a wireless communication network begins by entering and storing situation settings. When a communication is received at the network for the wireless device, the presence of the wireless device is determined. The situation settings are applied based upon the presence of the wireless device. The wireless device is informed of the communication via the applied situation settings.
    Type: Grant
    Filed: December 18, 2003
    Date of Patent: November 22, 2005
    Assignee: InterDigital Technology Corporation
    Inventors: Prabhakar R. Chitrapu, John David Kaewell, Jr.
  • Patent number: 6894995
    Abstract: The system and method of the present invention establishes a communication link between a user equipment (UE) and a base station in a communication system having a plurality of base stations which each transmit a common primary synchronization code (PSC) in a primary synchronization channel in conjunction with a base station specific secondary synchronization code (SSC) within a system frame, which receives with the UE an input signal including the PSC and SSC from at least one of the base stations. The UE analyzes the input signal to detect any received PSCs within a selected time period which has duration corresponding to the length of a system frame and determining a relative location of a strongest PSC within the selected time period. The input signal is then processed to remove the PSC from at least the determined PSC location. A secondary synchronization code (SSC) is then detected for the determined location from the processed signal. The communication link is then established using the detected SSCs.
    Type: Grant
    Filed: October 31, 2001
    Date of Patent: May 17, 2005
    Assignee: InterDigital Technology Corporation
    Inventors: Prabhakar R. Chitrapu, Louis J. Guccione, Andrew F. Bednarz
  • Patent number: 6853628
    Abstract: A system for supporting security and mobility management of wireless communications to multiple wireless transmit/receive units (WTRUs) includes a first database having a listing of each of the WTRUs along with their capabilities, and a second database having a listing of the location of each of the WTRUs. The second database has at least one subgroup which corresponds to at least two WTRUs which are co-located. The WTRUs in the subgroup are treated as a single WTRU for security and mobility management.
    Type: Grant
    Filed: December 30, 2002
    Date of Patent: February 8, 2005
    Assignee: Interdigital Technology Corporation
    Inventor: Prabhakar R. Chitrapu
  • Publication number: 20040248602
    Abstract: A method and system for performing initial cell search is disclosed. Step 1 processing is preformed to detect a peak primary synchronization code (PSC) location (i.e. chip offset or chip location). Step 2 processing is performed to obtain the toffset and code group. Step 3 processing is performed to identify the midamble of a base station with which the WTRU performing the initial cell search may synchronize with.
    Type: Application
    Filed: February 5, 2004
    Publication date: December 9, 2004
    Applicant: InterDigital Technology Corporation
    Inventors: Alpaslan Demir, Donald M. Grieco, John W. Haim, Andrew F. Bednarz, Philip J. Pietraski, Louis J. Guccione, Prabhakar R. Chitrapu