Patents by Inventor Debashish Purkayastha

Debashish Purkayastha 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: 20110196973
    Abstract: A method and apparatus for Inter-Device Session Continuity (IDSC). IDSC may include session transfer, session duplication, peer discovery, media transport control, session retrieval, and peer device detection of media streams between wireless transmit receive units (WTRUs) in real-time via Inter-User Equipment Transfer (IUT) across any internet protocol (IP) based network. This framework allows for both collaborative and non-collaborative media sessions, media session transport and shared media session control under the same subscription or multiple subscriptions.
    Type: Application
    Filed: February 4, 2011
    Publication date: August 11, 2011
    Applicant: INTERDIGITAL PATENT HOLDINGS, INC.
    Inventors: Kamel M. Shaheen, Debashish Purkayastha, Xavier DeFoy, Michelle Perras
  • Publication number: 20110188449
    Abstract: A method and apparatus for performing session duplication are provided. A communication session between a first wireless transmit/receive unit (WTRU) and a remote device may be duplicated to add a second WTRU to the communication session without disruption of the communication session on the first WTRU or the remote device. The communication session may be duplicated by a network unit in response to a policy or a communication session duplication request. The first WTRU or the second WTRU may initiate session duplication by transmitting a communication session duplication request. Session duplication may include duplication of one or more media flows associated with the communication session. Session duplication may include transferring or sharing control of the communication session.
    Type: Application
    Filed: November 16, 2010
    Publication date: August 4, 2011
    Applicant: INTERDIGITAL PATENT HOLDINGS, INC.
    Inventors: Kamel M. Shaheen, Oscar Lopez-Torres, Debashish Purkayastha
  • Publication number: 20110145419
    Abstract: A method and apparatus for performing session release are provided. For a transferred communication session between a plurality of wireless transmit/receive units (WTRUs) and a remote device, wherein at least one of the WTRUs performs the transferred communication session in association with a first Internet Protocol Multimedia Subsystem (IMS) and at least one other of the WTRUs performs the transferred communication session in association with a second IMS, session release may include releasing the transferred communication session, a portion thereof, one or more of the WTRUs, or a collaborative session associated with the transferred communication session while maintaining service continuity. Any one of the plurality of WTRUs or the remote device may initiate the session release by transmitting a release request. Any one of the plurality of WTRUs may control the transferred communication session and may modify or reject a release request.
    Type: Application
    Filed: December 15, 2010
    Publication date: June 16, 2011
    Applicant: INTERDIGITAL PATENT HOLDINGS, INC.
    Inventors: Kamel M. Shaheen, Milan Patel, Xavier De Foy, Debashish Purkayastha
  • Publication number: 20110138060
    Abstract: A method and apparatus for session duplication within the advanced multimedia system (AMS) framework are disclosed. The method includes duplicating a session running on a first application or device on a second application or device. A method and apparatus for sharing media is disclosed. The method includes sharing media running on a first application or device with a second application or device.
    Type: Application
    Filed: December 8, 2010
    Publication date: June 9, 2011
    Applicant: INTERDIGITAL PATENT HOLDINGS, INC.
    Inventors: Debashish Purkayastha, Kamel M. Shaheen
  • Publication number: 20110116473
    Abstract: A method and apparatus for Inter-User Equipment Transfer (IUT) of an IP Multimedia (IM) Subsystem (IMS) session between a circuit switched (CS) wireless transmit/receive unit (WTRU) and an IMS-capable WTRU.
    Type: Application
    Filed: November 10, 2010
    Publication date: May 19, 2011
    Applicant: INTERDIGITAL PATENT HOLDINGS, INC.
    Inventors: Kamel M. Shaheen, Xavier De Foy, Debashish Purkayastha
  • Publication number: 20110116495
    Abstract: Methods and apparatus for inter-device session transfer between devices operating according to different protocols are disclosed. The session may be a multimedia session supported by. Session Initiation Protocol (SIP) and the H.323 standard. The devices may include a SIP Client or an H.323 Client. The SIP Client may be an IMS-based SIP Client. An InterWorking Function (IWF) may support a session transfer from a SIP Client to an H.323 Client or from an H.323 Client to a SIP Client. A Media Gateway Control Function (MGCF) may support a session transfer from an Internet Protocol (IP) Multimedia Subsystem (IMS)-based SIP Client to an H.323 Client or from an H.323 Client to an IMS-based SIP Client.
    Type: Application
    Filed: November 3, 2010
    Publication date: May 19, 2011
    Applicant: INTERDIGITAL PATENT HOLDINGS, INC.
    Inventors: Debashish Purkayastha, Kamel M. Shaheen, Robert G. Gazda
  • Publication number: 20100220687
    Abstract: A network management node may manage a network of base stations and wireless transmit/receive units (WTRUs) that operate using diverse radio access technologies. The network management node may communicate with other network management nodes to manage spectrum usage across their respective managed networks. The network management node may acts as a proxy for cellular-capable WTRUs that operate within the managed networks. The network management node may perform handovers of Peer-to-Peer (P2P) groups that operate within the managed networks. The WTRUs may include WTRUs that operate at Very High Frequency (VHF) or Ultra High Frequency (UHF) spectrum (“white space”) frequencies.
    Type: Application
    Filed: February 9, 2010
    Publication date: September 2, 2010
    Applicant: INTERDIGITAL PATENT HOLDINGS, INC.
    Inventors: Alexander Reznik, Debashish Purkayastha, Joseph A. Kwak, Juan Carlos Zuniga, Tianming Li
  • Patent number: 7599515
    Abstract: A method and apparatus for securing transmission of content created by a content generation device embedded in a wireless transmit/receive unit (WTRU) by determining what type of watermarks should be applied to the content and incorporating the watermarks in the content. The WTRU includes a content generation unit, a watermark incorporation unit, and a communication subsystem. The content generation unit is embedded in the WTRU and generates content, such as audio, video, image, text or a combination thereof. The watermark incorporation unit determines the type of watermarks that should be incorporated in the content and incorporates the watermarks in the content. The communication subsystem transmits the watermarked content.
    Type: Grant
    Filed: March 17, 2005
    Date of Patent: October 6, 2009
    Assignee: InterDigital Technology Corporation
    Inventors: John Thommana, Debashish Purkayastha, Alain Charles Louis Briancon
  • Publication number: 20090201879
    Abstract: A radio interface layer media independent handover (RIL MIH) client functionality enables transparent inter-system handover of a wireless transmit/receive unit (WTRU) between different radio access technologies (RATs), without user intervention. The RIL MIH client interacts with RIL drivers and proxies, informs the RIL proxies of the handover status, then the proxies interact with a new driver in use. A WTRU is modified to add MIH functionality to a telephony server to support inter-system handover.
    Type: Application
    Filed: October 28, 2008
    Publication date: August 13, 2009
    Applicants: INTERDIGITAL TECHNOLOGY CORPORATION, SK TELECOM COMPANY, LTD
    Inventors: Debashish Purkayastha, Michelle Perras, Shamim Akbar Rahman, Ulises Olvera-Hernandez, Alan G. Carlton, Samian Kaur
  • Patent number: 7574220
    Abstract: A method and apparatus for protecting sensed content and warning a target of sensing is disclosed. A first transceiver, (e.g., a network server), includes a database which defines at least one zone in which sensing a target is not permitted. A second transceiver, (e.g., a cell phone), senses a target to obtain content and temporarily stores the content in a memory, after being encrypted. The cell phone transmits information to the network server which indicates the location of the cell phone. The network server receives the location information from the cell phone and determines whether the target was sensed in a “Do Not Disturb Zone”. If so, the network server instructs the cell phone to delete the encrypted content from the memory. Otherwise, the network server indicates to the cell phone that the temporarily stored content may be decrypted, stored in a permanent memory and used as desired.
    Type: Grant
    Filed: November 30, 2005
    Date of Patent: August 11, 2009
    Assignee: InterDigital Technology Corporation
    Inventors: Debashish Purkayastha, John Thommana
  • Publication number: 20090161629
    Abstract: A wireless transmit/receive unit (WTRU) may include two or more modems, each configured to link to a different network, and a media independent handover (MIH) client. An application programming interfaces (API) may provide the MIH client with mechanisms to receive information about links, control the modems for handover, discover a MIH server and IP multimedia system nodes, trigger mobile IP handover, etc. If a link has been successfully established, the MIH client may start a MIH session. When the modem indicates that a connection is going to be terminated, the MIH client may activate the second modem for handover. If the first modem indicates that a link parameter has crossed a threshold, the MIH client may send signal measurements to a MIH server. After receiving a media independent handover switch request, the MIH client may initiate handover to the second network.
    Type: Application
    Filed: September 12, 2008
    Publication date: June 25, 2009
    Applicants: INTERDIGITAL TECHNOLOGY CORPORATION, SK TELECOM, CO. LTD.,
    Inventors: Debashish Purkayastha, Shamim Akbar Rahman, Khalid S. Hossain, Michelle Perras, Hyun Wook Kim, Yong Sun Cho, Suan Eoh, Jean-Ian Boutin
  • Patent number: 7532723
    Abstract: Tokens/keys are produced for wireless communications. These tokens/keys are used for watermarks, signature insertion, encryption and other uses. In one embodiment, contextual information is used to generate tokens/keys. The tokens/keys may be derived directly from the contextual information. The contextual information may be used in conjunction with other information to derive the tokens/keys. Tokens/keys may be exchanged between transmit/receive units. The exchange of these tokens/keys may be encrypted.
    Type: Grant
    Filed: November 23, 2004
    Date of Patent: May 12, 2009
    Assignee: InterDigital Technology Corporation
    Inventors: Prabhakar R. Chitrapu, Alain Charles Louis Briancon, Akinlolu Oloruntosi Kumoluyi, Alan Gerald Carlton, Kiran Kumar S. Vanganuru, Richard Dan Herschaft, John Erich Hoffmann, John Thommana, Debashish Purkayastha, Guodong Zhang, Robert Lind Olesen, Alexander Reznik, TieJun Shan, Sung-Hyuk Shin, Amit Singhal
  • Publication number: 20090103496
    Abstract: Apparatus for bi-directional handover are disclosed. An apparatus configured to perform handover from a wireless code division multiple access (WCDMA) to a wireless broadband (WiBro) network is disclosed. An apparatus configured to perform handover from a WCDMA network to a WiFi (IEEE 802.11x) network is disclosed. An apparatus configured to perform handover from a WiFi network to a WCDMA network is disclosed.
    Type: Application
    Filed: September 12, 2008
    Publication date: April 23, 2009
    Applicants: INTERDIGITAL TECHNOLOGY CORPORATION, SK TELECOM CO.LTD.
    Inventors: Debashish Purkayastha, Shamim Akbar Rahman
  • Publication number: 20080189250
    Abstract: An embodiment is related to a database system for protecting data privacy and efficient organization of data. An enhanced database system comprises a DBMS, a data classifier, a database of applications and a rules and policy unit. The DBMS includes a query processor for processing a query from a user. The rules and policy unit outputs a pointer to a node within the data classification tree based on several criteria. In accordance with another embodiment, a DBMS residing within a communication network organizes data related to the ID of mobile users. In accordance with another embodiment, an enhanced database system comprises a DRM user agent and a DBMS. The DRM user agent receives a CO protected by DRM. The DBMS stores the CO and controls access to the CO based on restrictions specified in an RO associated with the CO.
    Type: Application
    Filed: September 12, 2007
    Publication date: August 7, 2008
    Applicant: INTERDIGITAL TECHNOLOGY CORPORATION
    Inventors: Inhyok Cha, Debashish Purkayastha, Richard D. Herschaft, Yogendra C. Shah
  • Publication number: 20070249390
    Abstract: A method and a wireless transmit/receive unit (WTRU) for communication in a first and a different second type of wireless networks. The WTRU includes respective components configured for wireless communication of user data with the respective first and second type of wireless networks and an upper layer application processing component configured to process user data. An interface coupling the upper layer application processing component and the respective types of wireless components selectively controls the flow of user data. The interface include a controllable data buffer switch that defines a multi-pronged bufferable path for user data between the upper layer application processing component and respective types of wireless components. A control device controls the data buffer switch to buffer user data in connection with switching user data flow from one prong of the multi-pronged bufferable path to another prong of the multi-pronged bufferable path.
    Type: Application
    Filed: April 13, 2007
    Publication date: October 25, 2007
    Applicant: INTERDIGITAL TECHNOLOGY CORPORATION
    Inventors: Debashish Purkayastha, Amarnath Chitti
  • Patent number: 7272240
    Abstract: A method and apparatus for generating and adjusting a watermark in a watermarking system comprising a watermark generator and a watermark detector includes the watermark generator emitting the watermark. The watermark detector detects the watermark. The watermark detector transmits a signal to the watermark generator. The watermark generator then adjusts the generated watermark based on the signal received from the watermark detector.
    Type: Grant
    Filed: November 23, 2005
    Date of Patent: September 18, 2007
    Assignee: InterDigital Technology Corporation
    Inventors: Steven Jeffrey Goldberg, Debashish Purkayastha
  • Publication number: 20070173283
    Abstract: A multiple radio access technology (RAT) apparatus with mobility middleware provides a user with access to various RAT networks, such as a frequency division duplex (FDD) network and a wireless local area network (WLAN). In one embodiment, the apparatus is a dual mode FDD/WLAN converged wireless communication handset which includes a terminal equipment (TE) module having mobility middleware, an applications and protocols processor and a terminal interface (TI). The dual mode FDD/WLAN converged wireless communication handset further includes a user services identity module (USIM), a mobile termination (MT) module and a protocol stack which interface with the mobility middleware via a plurality of links.
    Type: Application
    Filed: December 12, 2006
    Publication date: July 26, 2007
    Applicant: INTERDIGITAL TECHNOLOGY CORPORATION
    Inventors: Catherine Livet, Debashish Purkayastha, Shamim Rahman, Guang Lu, Alan Carlton, Narayan Menon
  • Publication number: 20070136397
    Abstract: A system for information life-cycle management includes a metadata depicter, a policy manager, a data manager, and a data organizer. The metadata depicter is configured to create metadata for an attribute of a data type. The policy manager is configured to apply the metadata as a rule to data records of the data type. The data manager is configured to control at least one data storage device, and operates under the direction of the policy manager. The data organizer is configured to determine how data is organized on the storage devices, and operates under the direction of the policy manager.
    Type: Application
    Filed: December 29, 2005
    Publication date: June 14, 2007
    Applicant: InterDigital Technology Corporation
    Inventors: Ravikumar Pragada, Debashish Purkayastha
  • Patent number: 7204746
    Abstract: A mobile wireless transmit/receive unit (WTRU), components and methods therefor provide continuous communications capability while switching from a wireless connection with a first type of wireless system to a wireless connection with a second type of wireless system. Preferably, the WTRU is configured to switch wireless links from a Universal Mobile Telecommunications System (UMTS) to a wireless local area network (WLAN) or vice versa during a continuous communication session. The invention is preferably implemented by providing an Application Broker for control signaling and a Communications broker for user data flow which may be embodied in an application specific integrated circuit (ASIC).
    Type: Grant
    Filed: December 16, 2005
    Date of Patent: April 17, 2007
    Assignee: InterDigital Technology Corporation
    Inventors: Debashish Purkayastha, Amarnath Chitti
  • Publication number: 20070036353
    Abstract: The present invention relates to secret key generation and authentication methods that are based on joint randomness not shared by others (JRNSO), in which unique channel response between two communication terminals generates a secret key. Multiple network access points use a unique physical location of a receiving station to increase user data security. High data rate communication data is encrypted by generating a random key and a pseudo-random bit stream. A configurable interleaving is achieved by introduction of JRNSO bits to an encoder used for error-correction codes. Databases of user data are also protected by JRNSO-based key mechanisms. Additional random qualities are induced on the joint channel using MIMO eigen-beamforming, antenna array deflection, polarization selection, pattern deformation, and path selection by beamforming or time correlation. Gesturing induces randomness according to uniquely random patterns of a human user's arm movements inflected to the user device.
    Type: Application
    Filed: May 31, 2006
    Publication date: February 15, 2007
    Applicant: InterDigital Technology Corporation
    Inventors: Alexander Reznik, Debashish Purkayastha, Steven Goldberg, Robert Olesen, Marian Rudolf, Inhyok Cha, Alan Carlton, Yogendra Shah, Shamim Rahman, Rajat Mukherjee, Robert DiFazio, Gregory Sternberg, Leonid Kazakevich, Kazimierz Siwiak, Guodong Zhang, Tanbir Haque, Louis Guccione, Prabhakar Chitrapu, Akinlolu Kumoluyi, Alain Briancon