Patents by Inventor Subrahmanyam Dravida

Subrahmanyam Dravida 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: 8942130
    Abstract: For a peer-to-peer call in an ad hoc wireless network, a wireless device performs discovery of a target wireless device, performs authentication of the target wireless device and generates a session key (e.g., using a pre-shared key or a certificate provisioned on the wireless device), forms an ad hoc wireless network with the target wireless device, and communicates peer-to-peer with the target wireless device via the ad hoc wireless network. The wireless device may perform discovery with a list of identifiers for wireless devices designated to communicate with this wireless device. The wireless device may derive a service set identifier (SSID) used to identify the ad hoc wireless network based on its user-specific identifier (e.g., its phone number) and/or a user-specific identifier for the target wireless device. The wireless device may also performs IP address discovery using the user-specific identifier for the target wireless device.
    Type: Grant
    Filed: March 7, 2013
    Date of Patent: January 27, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Ravi Kumar, J. Rodney Walton, Qiang Fu, Subrahmanyam Dravida
  • Patent number: 8942133
    Abstract: For a peer-to-peer call in an ad hoc wireless network, a wireless device performs discovery of a target wireless device, performs authentication of the target wireless device and generates a session key (e.g., using a pre-shared key or a certificate provisioned on the wireless device), forms an ad hoc wireless network with the target wireless device, and communicates peer-to-peer with the target wireless device via the ad hoc wireless network. The wireless device may perform discovery with a list of identifiers for wireless devices designated to communicate with this wireless device. The wireless device may derive a service set identifier (SSID) used to identify the ad hoc wireless network based on its user-specific identifier (e.g., its phone number) and/or a user-specific identifier for the target wireless device. Other aspects, embodiments, and features are also claimed and described.
    Type: Grant
    Filed: November 1, 2013
    Date of Patent: January 27, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Ravi Kumar, J. Rodney Walton, Qiang Fu, Subrahmanyam Dravida
  • Publication number: 20140056293
    Abstract: For a peer-to-peer call in an ad hoc wireless network, a wireless device performs discovery of a target wireless device, performs authentication of the target wireless device and generates a session key (e.g., using a pre-shared key or a certificate provisioned on the wireless device), forms an ad hoc wireless network with the target wireless device, and communicates peer-to-peer with the target wireless device via the ad hoc wireless network. The wireless device may perform discovery with a list of identifiers for wireless devices designated to communicate with this wireless device. The wireless device may derive a service set identifier (SSID) used to identify the ad hoc wireless network based on its user-specific identifier (e.g., its phone number) and/or a user-specific identifier for the target wireless device. Other aspects, embodiments, and features are also claimed and described.
    Type: Application
    Filed: November 1, 2013
    Publication date: February 27, 2014
    Applicant: QUALCOMM Incorporated
    Inventors: Ravi KUMAR, J. Rodney WALTON, Qiang Fu, Subrahmanyam DRAVIDA
  • Patent number: 8626172
    Abstract: A wireless communication method, apparatus, and system for simultaneous communication of a wide area network with a wireless local area network. The system having the wide area network configured to transmit control signals, the wireless local area network configured to transmit data signals, and a mobile station configured to receive control signals from the wide area network and data signals from the wireless local area network.
    Type: Grant
    Filed: August 9, 2006
    Date of Patent: January 7, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Subrahmanyam Dravida, Jay Rodney Walton, Shravan K. Surineni
  • Patent number: 8594112
    Abstract: Aspects disclosed herein address the need in the art for memory management for high speed media access control. A packet buffer may store packets with a first data structure, comprising the packet length, sequence number, and a pointer to a second data structure. Packet data may be stored in a linked list of one or more second data structures. Transmit and receive queues may be formed using linked lists or arrays of the first data structures. Memory locations for storing first and second data structures may be kept in lists indicating free locations for the respective data structure types. A flexible memory architecture is disclosed in which two configurations may be selected. Various other aspects are also presented.
    Type: Grant
    Filed: March 20, 2012
    Date of Patent: November 26, 2013
    Assignee: QUALCOMM Incorporated
    Inventors: Subrahmanyam Dravida, Sriram Narayan
  • Patent number: 8576846
    Abstract: For a peer-to-peer call in an ad hoc wireless network, a wireless device performs discovery of a target wireless device, performs authentication of the target wireless device and generates a session key (e.g., using a pre-shared key or a certificate provisioned on the wireless device), forms an ad hoc wireless network with the target wireless device, and communicates peer-to-peer with the target wireless device via the ad hoc wireless network. The wireless device may perform discovery with a list of identifiers for wireless devices designated to communicate with this wireless device. The wireless device may derive a service set identifier (SSID) used to identify the ad hoc wireless network based on its user-specific identifier (e.g., its phone number) and/or a user-specific identifier for the target wireless device. The wireless device may also performs IP address discovery using the user-specific identifier for the target wireless device.
    Type: Grant
    Filed: October 3, 2006
    Date of Patent: November 5, 2013
    Assignee: QUALCOMM Incorporated
    Inventors: Ravi Kumar, J. Rodney Walton, Qiang Fu, Subrahmanyam Dravida
  • Patent number: 8462626
    Abstract: The present system uses point-to-point data links between intelligent network elements located in the feeder/distribution network to provide reliable, secure, bi-directional broadband access. Digital signals, or messages, are terminated at the intelligent network elements, switched and regenerated for transmission across additional upstream or downstream data links as needed to connect a home to a headend or router. Messages indicative of an end user routing ID (RID) are identified and the information extracted for user with successive messages. In this manner, the data links are made over relatively short runs of coax cable, which can provide greater bandwidth than the typical end-to-end feeder/distribution connection between a home and the headend or optical network unit.
    Type: Grant
    Filed: August 20, 2007
    Date of Patent: June 11, 2013
    Assignee: Ciena Corporation
    Inventors: Gautam Desai, Subrahmanyam Dravida, Satya V. Gupta, Kiran M. Rege, Manas Tandon, Ravi S. Kumar, DeQuan Wu
  • Patent number: 8364148
    Abstract: Embodiments describe registration in a wireless communication system. A method includes wirelessly transmitting over a WWAN a first registration message from a mobile device, wirelessly transmitting through the WWAN a second registration message to a WLAN access point and receiving at the mobile device access through the WLAN access point. According to another embodiment is a method for constructing a self-configuring ad-hoc network. The method can include receiving a GPS coordinate from a WWAN channel node at a management system and creating an initial topography based at least in part on the GPS coordinate to achieve a network connectivity with diverse routes between a plurality of nodes.
    Type: Grant
    Filed: September 30, 2005
    Date of Patent: January 29, 2013
    Assignee: Qualcomm Incorporated
    Inventors: Subrahmanyam Dravida, Jay Rodney Walton, Sanjiv Nanda, Shravan K. Surineni
  • Patent number: 8311543
    Abstract: Embodiments describe utilizing time-based information to improve communication in a wireless network. A method can include receiving beacon information from at least one access point and utilizing time-stamp information associated with the beacon information to determine whether to hand off communication with a second access point. According to other embodiments the method can further include detecting beacon quality is below a threshold level and transmitting a poor beacon quality message. Information relating to a plurality of alternate access points can be received in response to the transmitted poor beacon quality message.
    Type: Grant
    Filed: September 30, 2005
    Date of Patent: November 13, 2012
    Assignee: Qualcomm Incorporated
    Inventors: Subrahmanyam Dravida, Jay Rodney Walton, Sanjiv Nanda, Shravan K. Surineni
  • Publication number: 20120236789
    Abstract: Aspects disclosed herein address the need in the art for memory management for high speed media access control. A packet buffer may store packets with a first data structure, comprising the packet length, sequence number, and a pointer to a second data structure. Packet data may be stored in a linked list of one or more second data structures. Transmit and receive queues may be formed using linked lists or arrays of the first data structures. Memory locations for storing first and second data structures may be kept in lists indicating free locations for the respective data structure types. A flexible memory architecture is disclosed in which two configurations may be selected. Various other aspects are also presented.
    Type: Application
    Filed: March 20, 2012
    Publication date: September 20, 2012
    Applicant: QUALCOMM Incorporated
    Inventors: Subrahmanyam Dravida, Sriram Narayan
  • Patent number: 8169980
    Abstract: Apparatuses and methodologies are described that coordinate multiple wireless communication protocols within a mobile device. A single mobile device can contain multiple communication components (e.g., a Bluetooth component, an IEEE 802.11b/g component). To prevent interference and possible loss of data, one communication component may be prevented from transmitting or receiving data packets while the other communication component is either transmitting or receiving. The components may be coordinated by a central controller located in the mobile device. Alternatively, the communication components may exchange messages to determine transmission or reception priority. In addition, one communication component may monitor the status of the other communication component to determine unused communication slots.
    Type: Grant
    Filed: April 26, 2006
    Date of Patent: May 1, 2012
    Assignee: QUALCOMM Incorporated
    Inventors: Subrahmanyam Dravida, Sanjiv Nanda, Manoneet Singh, Shravan K. Surineni
  • Patent number: 8139593
    Abstract: Aspects disclosed herein address the need in the art for memory management for high speed media access control. A packet buffer may store packets with a first data structure, comprising the packet length, sequence number, and a pointer to a second data structure. Packet data may be stored in a linked list of one or more second data structures. Transmit and receive queues may be formed using linked lists or arrays of the first data structures. Memory locations for storing first and second data structures may be kept in lists indicating free locations for the respective data structure types. A flexible memory architecture is disclosed in which two configurations may be selected. In a first configuration, a first memory comprises per-flow parameters for multiple flows, and a second memory comprises a packet buffer. In a second configuration, the first memory comprises per-flow pointers to per-flow parameters in the second memory. The packet buffer resides in a third memory.
    Type: Grant
    Filed: March 30, 2007
    Date of Patent: March 20, 2012
    Assignee: QUALCOMM Incorporated
    Inventors: Subrahmanyam Dravida, Sriram Narayan
  • Patent number: 8126477
    Abstract: Embodiments describe methods, systems, and devices that utilize positional information to determine location of other device and/or to provide a location-based message. A method can include receiving a location information of a mobile device and using an access point to transmit location information to one or more other devices that do not include location functionality that are in communication with the mobile device. The method can further include transmitting a message to the mobile device based at least in part on the received access location information. In another embodiment, the method can include receiving a user preference data from the mobile device or one or more other devices and transmitting a communication to the mobile device or one or more other devices that conforms to the user preference data.
    Type: Grant
    Filed: September 30, 2005
    Date of Patent: February 28, 2012
    Assignee: QUALCOMM Incorporated
    Inventors: Subrahmanyam Dravida, Jay Rodney Walton, Sanjiv Nanda, Shravan K. Surineni
  • Patent number: 7924883
    Abstract: The present system uses point-to-point data links between intelligent network elements located in the feeder/distribution network to provide reliable, secure, bi-directional broadband access. Digital signals are terminated at the intelligent network elements, switched and regenerated for transmission across additional upstream or downstream data links as needed to connect a home to a headend or router. The intelligent network elements can be co-located with or replace the standard network elements to take advantage of existing network configurations. A tree-and-branch network architecture is therefore established in which each intelligent network element is assigned a routing ID employed in the point-to-point transmissions while leaving legacy analog signals unimpeded. In this manner, the data links are made over relatively short runs of coax cable, which can provide greater bandwidth than the typical end-to-end feeder/distribution connection between a home and the headend or optical network unit.
    Type: Grant
    Filed: August 20, 2007
    Date of Patent: April 12, 2011
    Assignee: Ciena Corporation
    Inventors: Subrahmanyam Dravida, Dey V. Gupta, Frederick Peralta, Kiran M. Rege, Manas Tandon
  • Patent number: 7835379
    Abstract: The present system uses point-to-point data links between intelligent network elements located in the feeder/distribution network to provide reliable, secure, bidirectional broadband access. Digital signals are terminated at the intelligent network elements, switched and regenerated for transmission across additional upstream or downstream data links as needed to connect a home to a headend or router. The intelligent network elements are co-located with or replace the standard network elements to take advantage of existing network configurations. The standard network elements are selectively replaced by the intelligent network elements in an incremental approach. A tree-and-branch network architecture is established in which each intelligent network element is assigned a routing ID employed in the point-to-point transmissions while leaving legacy analog signals unimpeded.
    Type: Grant
    Filed: July 12, 2005
    Date of Patent: November 16, 2010
    Assignee: Ciena Corporation
    Inventors: Subrahmanyam Dravida, Dev V. Gupta, Frederick Peralta, Kiran M. Rege, Manas Tandon
  • Patent number: 7603141
    Abstract: A multi-antenna station with distributed antennas and capable of providing good performance for terminals distributed throughout the coverage area of the multi-antenna station is described. The multi-antenna station includes multiple antennas, a controller, and at least one transmitter unit. The multiple antennas are coupled to the multi-antenna station and include at least one remote antenna that is located away from the multi-antenna station. The controller selects a set of one or more antennas from among the multiple antennas for data transmission to a terminal. The at least one transmitter unit transmits data to the terminal via the set of one or more antennas.
    Type: Grant
    Filed: June 2, 2005
    Date of Patent: October 13, 2009
    Assignee: Qualcomm, Inc.
    Inventor: Subrahmanyam Dravida
  • Patent number: 7502361
    Abstract: A new protocol layer is provided as part of a protocol stack associated with a packet-based multiaccess mobile communications system. The protocol layer is preferably located above a medium access control (MAC) protocol layer and a physical protocol layer of the system and below a transport/network protocol layer. Such a subnetwork protocol layer provides, inter alia, the communications system with various mobility management functions, for example, tracking mobile user stations throughout the system, mobile station access to the system, and connection/call continuity within the system. The subnetwork protocol layer of the invention also performs packet routing functions associated with the system. Routing can be accomplished in many ways, for example, via source routing, connectionless routing, or tunneling. Further, the new protocol layer of the invention is preferably located above a data link layer with respect to the protocol stack associated with communications between network nodes.
    Type: Grant
    Filed: January 15, 2003
    Date of Patent: March 10, 2009
    Assignee: Alcatel-Lucent USA Inc.
    Inventors: Walid Ahmed, Bharat Tarachand Doshi, Subrahmanyam Dravida, Hong Jiang, Kiran M. Rege
  • Publication number: 20080209494
    Abstract: Hybrid fiber/coax networks employ the existing cable plant used for cable TV and transmit data signals in a frequency bandwidth above that which is used for cable TV. As this cable plant was deployed in a tree and branch topology, data transmissions may be susceptible to noise, variable transmission loss and frequency dispersion, particularly in the upstream direction. Further, due to the tree and branch topology, homes at the far end of the network experience much greater loss than do the homes that are near to the headend/ONU. The present system, which uses point-to-point data links between intelligent network elements located in the feeder/distribution network to provide reliable, secure, bi-directional broadband access. Digital signals are terminated at the intelligent network elements, switched and regenerated for transmission across additional upstream or downstream data links as needed to connect a home to a headend or router.
    Type: Application
    Filed: August 20, 2007
    Publication date: August 28, 2008
    Inventors: Subrahmanyam Dravida, Dey V. Gupta, Frederick Peralta, Kiran M. Rege, Manas Tandon
  • Publication number: 20080056130
    Abstract: Hybrid fiber/coax networks employ the existing cable plant used for cable TV and transmit data signals in a frequency bandwidth above that which is used for cable TV. As this cable plant was deployed in a tree and branch topology, data transmissions may be susceptible to noise, variable transmission loss and frequency dispersion, particularly in the upstream direction. Further, due to the tree and branch topology, homes at the far end of the network experience much greater loss than do the homes that are near to the headend/ONU. The present system, which uses point-to-point data links between intelligent network elements located in the feeder/distribution network to provide reliable, secure, bi-directional broadband access. Digital signals, or messages, are terminated at the intelligent network elements, switched and regenerated for transmission across additional upstream or downstream data links as needed to connect a home to a headend or router.
    Type: Application
    Filed: August 20, 2007
    Publication date: March 6, 2008
    Inventors: Gautam Desai, Subrahmanyam Dravida, Satya Gupta, Kiran Rege, Manas Tandon, Ravi Kumar, DeQuan Wu
  • Patent number: RE40923
    Abstract: A simplified data link protocol which may be implemented in a very high-speed transmission system, e.g., SONET, processes a datagram received from an IP facility according to QoS considerations and scrambles a datagram before it is again scrambled by a transmission system, e.g., a SONET transmitter, to ensure that the pattern of a user's data does not match the transmission scrambling pattern. The data link protocol scrambler also employs a novel synchronization scheme. We also use a pointer system which identifies the location of a datagram in a frame to eliminate flags and the need to process user data to ensure that it does not contain and a boundary flag.
    Type: Grant
    Filed: April 16, 2003
    Date of Patent: September 29, 2009
    Assignee: Agere Systems Inc.
    Inventors: Jon Anderson, Bharat Tarachand Doshi, Subrahmanyam Dravida, Enrique Hernandez-Valencia, Murali Krishnaswamy, James S. Manchester