Patents by Inventor Kadathur S. Natarajan

Kadathur S. Natarajan 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: 8509788
    Abstract: Various embodiments are described to enable multiple, independent communication networks to share in an autonomous and dynamic manner unlicensed wireless resources. Generally, this involves determining that a first network node (122) is using at least a portion of a wireless resource to provide network service to at least one remote unit (102). A second network node (123), under the control of a different network operator than the first node and desiring to use the wireless resource, sends the first network node, a request to relinquish use of at least a portion of the wireless resource. The second network node sends this request wirelessly, perhaps using the wireless resource itself. If the first network node grants the request, the second node may then begin using at least a portion of the relinquished resource to provide network service.
    Type: Grant
    Filed: March 8, 2007
    Date of Patent: August 13, 2013
    Assignee: Motorola Mobility LLC
    Inventors: Kadathur S. Natarajan, Daniel J. Coombes, William A Payne, III
  • Patent number: 8116244
    Abstract: A method and apparatus includes a scheduling entity (308) for scheduling and transmitting the superframe (402) across a communication network (200). The controller (310) coupled with scheduling entity (308) groups the subscriber unit (304) into one of the plurality of groups. The scheduler entity (308) assigns a coding scheme for each group and encodes each frame of the superframe (402) based upon the assigned coding scheme for the group, to which the frame is to be transmitted. The transceiver (316) coupled with controller (310) via hardware interface (314) receives the encoded superframe and transmits the superframe to the plurality of subscriber units in the communication network (200).
    Type: Grant
    Filed: December 19, 2006
    Date of Patent: February 14, 2012
    Assignee: Motorola Mobility, Inc.
    Inventors: Gregory M. Agami, Jiangnan Chen, Kadathur S. Natarajan
  • Patent number: 7848241
    Abstract: A mobile communications system includes a first base station to service a first set of connections from a first set of mobile communications devices to a communications network. A set of neighboring base stations is in communication with the first base station. In an embodiment of the invention, the first base station prioritizes the first set of connections according to first predetermined criteria and prioritizes the set of neighboring base stations according to second predetermined criteria. The prioritization lists are used in deterministic ways to alleviate potential congestion in backhaul links and optimize the overall performance of system and improved quality of service.
    Type: Grant
    Filed: January 31, 2006
    Date of Patent: December 7, 2010
    Assignee: Motorola Mobility, Inc.
    Inventors: Kadathur S. Natarajan, Dragan M. Boscovic, Gerald J. Gutowski
  • Patent number: 7623493
    Abstract: Various embodiments are described to address the need for an apparatus and method that improves upon known handoff techniques, such as Mobile IP and Fast Mobile IP, to improve the mobility experience of an end user. OSI layer 2-originated indications of a handoff being imminent (301, 501, 502), a link down for handoff (307, 509, 510), and a new link up after handoff (309, 511, 512) are introduced. These indications can be used by applications (such as real-time/streaming applications on the mobile (101)) to take suitable proactive measures prior to an actual handoff. Examples of such measures include the buffering of data to be used during the handoff interval in a way that improves the seamless mobility experience of the end user.
    Type: Grant
    Filed: February 13, 2006
    Date of Patent: November 24, 2009
    Assignee: Motorola, Inc.
    Inventors: Kamel A. Baba, Mohammed D. Ali, Kadathur S. Natarajan
  • Publication number: 20090111474
    Abstract: A method, information processing system, and wireless communication system that selects a set of network paths for transmitting data to a serving network. The method first determines (404) that there is data to transmit to the serving network (102). For each of a plurality of base stations (106, 107, 108), an assessment of at least one traffic engineering parameter associated with each of the base stations (106, 107, 108) is performed (406). A set of base stations in which the traffic engineering parameters satisfy predetermined communication criteria associated with the wireless device (104) is selected (408) in response to performing the assessment. The selected set of base stations is used to transmit wireless device data to the serving network.
    Type: Application
    Filed: October 24, 2007
    Publication date: April 30, 2009
    Applicant: MOTOROLA, INC.
    Inventors: Thomas C. Hill, Troy Dixler, Kadathur S. Natarajan, Paul D. Steinberg
  • Patent number: 7471621
    Abstract: A base station has a transmission element to wirelessly transmit at least one data frame. The at least one data frame has a predetermined uplink allocation and a predetermined downlink allocation. A detection element detects a congestion condition. When the congestion condition is detected, the transmission element transmits a request to at least one neighboring base station for an expansion of the predetermined uplink allocation or the predetermined downlink allocation. A reception element receives a signal from the at least one neighboring base station. A processing element expand the one of the predetermined uplink allocation or the predetermined downlink allocation by a specified amount in response to the signal indicating the specified amount for a mutually agreed time, or number of symbols or frames.
    Type: Grant
    Filed: April 6, 2006
    Date of Patent: December 30, 2008
    Assignee: Motorola, Inc.
    Inventors: David T. Chen, Kadathur S. Natarajan, Ivan N. Vukovic
  • Publication number: 20080219213
    Abstract: Various embodiments are described to enable multiple, independent communication networks to share in an autonomous and dynamic manner unlicensed wireless resources. Generally, this involves determining that a first network node (122) is using at least a portion of a wireless resource to provide network service to at least one remote unit (102). A second network node (123), under the control of a different network operator than the first node and desiring to use the wireless resource, sends the first network node, a request to relinquish use of at least a portion of the wireless resource. The second network node sends this request wirelessly, perhaps using the wireless resource itself. If the first network node grants the request, the second node may then begin using at least a portion of the relinquished resource to provide network service.
    Type: Application
    Filed: March 8, 2007
    Publication date: September 11, 2008
    Applicant: MOTOROLA, INC.
    Inventors: Kadathur S. Natarajan, Daniel J. Coombes, William A. Payne
  • Publication number: 20080151833
    Abstract: A system for distributing bandwidth in a mesh network includes a first access point (AP1) that determines an amount of data to be sent from the first access point to the second access point (AP2) and receives a value indicating an amount of data to be received from the second access point. The first access point (AP1) then determines a percentage of a frame (I) to be used to send the data from the first access point to the second access point by multiplying the total data-carrying portion (206, 210) of the frame (I) by the amount of data to be sent from the first access point to the second access point divided by the sum of the amount of data to be sent from the first access point to the second access point and the amount of data to be received from the second access point.
    Type: Application
    Filed: December 20, 2006
    Publication date: June 26, 2008
    Applicant: MOTOROLA, INC.
    Inventor: Kadathur S. Natarajan
  • Publication number: 20080151834
    Abstract: A system dynamically adjusts bandwidth allocations in a mesh network that includes at least two data communication pathways (214 and 222, 216, and 212) between a first access point (AP1) and a second access point (AP2). The first access point (AP1) determines an amount of data to be sent to the second access point (AP2) and selects at least one of the data communication pathways (214 and 222, 216, and 212) for sending the amount of data. The first access point (AP1) receives an overload value indicating a maximum amount of data to be transmitted to the second access point (AP2) along the selected data communication pathway, compares the overload value to the amount of data to be sent, and reduces a routing probability value assigned to the selected communication pathway in response to the overload value being less than the amount of data to be sent.
    Type: Application
    Filed: December 20, 2006
    Publication date: June 26, 2008
    Applicant: MOTOROLA, INC.
    Inventor: Kadathur S. Natarajan
  • Publication number: 20080144567
    Abstract: A method and apparatus includes a scheduling entity (308) for scheduling and transmitting the superframe (402) across a communication network (200). The controller (310) coupled with scheduling entity (308) groups the subscriber unit (304) into one of the plurality of groups. The scheduler entity (308) assigns a coding scheme for each group and encodes each frame of the superframe (402) based upon the assigned coding scheme for the group, to which the frame is to be transmitted. The transceiver (316) coupled with controller (310) via hardware interface (314) receives the encoded superframe and transmits the superframe to the plurality of subscriber units in the communication network (200).
    Type: Application
    Filed: December 19, 2006
    Publication date: June 19, 2008
    Applicant: MOTOROLA, INC.
    Inventors: Gregory M. Agami, Jiangnan Jason Chen, Kadathur S. Natarajan
  • Patent number: 6993335
    Abstract: An apparatus and method for performing Mobile/IP handoff between different access technologies. Associated with each access technology are two thresholds, a Low Water Mark and a High Water Mark. The method uses these water marks to its access technology selection in a particular environment. Using the method, a mobile node 102 remains on its preferred network when the signal strength on the preferred network (interface) is above the low water mark. When the signal strength on the preferred network drops below the high water mark, the method calculates the low water mark for the network. When the signal strength on the preferred network drops below the low water mark (LWM), the method initiates handoff to the next available network that meets certain conditions. The method initiates handoff back to the preferred network when the signal strength measurement on the preferred network is again above the high water mark.
    Type: Grant
    Filed: November 15, 2002
    Date of Patent: January 31, 2006
    Assignee: Motorola, Inc.
    Inventors: Kadathur S. Natarajan, Karthikeyan Arumugam, Muddasani S. Reddy, Mary M. Valdivia, Ajoy K. Singh
  • Publication number: 20040097230
    Abstract: An apparatus and method for performing Mobile/IP handoff between different access technologies. Associated with each access technology are two thresholds, a Low Water Mark and a High Water Mark. The method uses these water marks to its access technology selection in a particular environment. Using the method, a mobile node 102 remains on its preferred network when the signal strength on the preferred network (interface) is above the low water mark. When the signal strength on the preferred network drops below the high water mark, the method calculates the low water mark for the network. When the signal strength on the preferred network drops below the low water mark (LWM), the method initiates handoff to the next available network that meets certain conditions. The method initiates handoff back to the preferred network when the signal strength measurement on the preferred network is again above the high water mark.
    Type: Application
    Filed: November 15, 2002
    Publication date: May 20, 2004
    Inventors: Kadathur S. Natarajan, Karthikeyan Arumugam, Muddasani S. Reddy, Mary M. Valdivia, Ajoy K. Singh
  • Patent number: 6597913
    Abstract: A dynamic channel management method (100) determines which base station (14, 24, 26) is a least utilized base station for servicing a channel request made by a subscriber unit (40). The least utilized base station is based on what base station (14, 24, 26) is more available to handle the channel request. If the least utilized base station can handle the channel request, it assigns and grants a channel to the subscriber unit (40). Otherwise, the channel request is blocked or denied. The dynamic channel management method (100) provides a systematic way for dynamically matching the available channel resources with the actual demand as a function of time. This enables the system (10) to handle significantly more traffic than with pure static channel management schemes.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: July 22, 2003
    Assignee: Motorola, Inc.
    Inventor: Kadathur S. Natarajan
  • Publication number: 20020049039
    Abstract: A dynamic channel management method (100) determines which base station (14, 24, 26) is a least utilized base station for servicing a channel request made by a subscriber unit (40). The least utilized base station is based on what base station (14, 24, 26) is more available to handle the channel request. If the least utilized base station can handle the channel request, it assigns and grants a channel to the subscriber unit (40). Otherwise, the channel request is blocked or denied. The dynamic channel management method (100) provides a systematic way for dynamically matching the available channel resources with the actual demand as a function of time. This enables the system (10) to handle significantly more traffic than with pure static channel management schemes.
    Type: Application
    Filed: June 5, 1995
    Publication date: April 25, 2002
    Inventor: KADATHUR S. NATARAJAN
  • Patent number: 6157632
    Abstract: The present invention provides a method/protocol (400, 800) and device (600; 700) for transmitting a synchronous stream of information, in a wireless, centrally controlled communication system. The method includes the steps of parsing the synchronous stream of information into a plurality of predetermined fixed sized blocks and transmitting/retransmitting each fixed size block in a predetermined window of time until one of: reception of each fixed size block is positively acknowledged and each corresponding predetermined window of time has elapsed.
    Type: Grant
    Filed: July 16, 1997
    Date of Patent: December 5, 2000
    Assignee: Motorola, Inc.
    Inventors: Mark C. Cudak, James R. Kelton, Phillip D. Rasky, Bruce D. Mueller, Kadathur S. Natarajan
  • Patent number: 6072774
    Abstract: A communication network (20) includes a multiplicity of switching nodes (18), many of which are located in orbiting satellites (16). Communication links (30) interconnect the switching nodes (18). A control center (32) performs a request for connection process (40) which routes a new call request over a current internodal topology of links (35) if possible. If the new call request cannot be routed over the current internodal topology of links (35), the process (40) determines how to augment the network with the creation of new links (45) so that the new call can be routed. As calls terminate, unused links are taken out of service.
    Type: Grant
    Filed: May 5, 1997
    Date of Patent: June 6, 2000
    Assignee: Motorola
    Inventors: Kadathur S. Natarajan, Randy Lee Turcotte, Sergio Aguirre
  • Patent number: 5826169
    Abstract: The call admission control method provides guaranteed bandwidth connections in a mobile telecommunication networks (10) that have varying topology and dynamic capacities. Method (100) provides a systematic way to decide when to admit connection requests in a low-earth or medium-earth orbit based satellite telecommunication system (10). A call admission controller, located in a ground control station (40) receives a connection request from an earth station (50) that may be forwarded from a satellite (21) in a constellation (20) of satellites. The call admission controller segments a call holding time into a sequence of time segments and determines whether a path exists through the network (10) that has the required minimum bandwidth for each of the time segments. If such a path exists, the connection request is admitted and the call goes through. Otherwise, the call is denied and communication is blocked.
    Type: Grant
    Filed: September 25, 1995
    Date of Patent: October 20, 1998
    Assignee: Motorola, Inc.
    Inventor: Kadathur S. Natarajan
  • Patent number: 5790070
    Abstract: A satellite communication network (10) coordinates multiple steerable satellite beams (28) with user requests for connections requiring varying bandwidth in real-time. A control station (22) gathers user requests for connections (64) and transmits those requests (70) to a satellite (20) over an uplink (70). Requests for bandwidth (72) are processed in the satellite (20) where time slot assignments (74) and steerable beam schedules (84) are determined in response to user requests (74). Steerable beam schedule (84) and time slot assignments (74) are transmitted to subscriber units (24) and control station (22) over a broadcast downlink (86). Subscriber units (24) complete a data transfer interval of a call (62) while a steerable beam schedule (84) is executed in real-time.
    Type: Grant
    Filed: May 5, 1997
    Date of Patent: August 4, 1998
    Assignee: Motorola, Inc.
    Inventors: Kadathur S. Natarajan, Randy Lee Turcotte, Sergio Aguirre
  • Patent number: 5749044
    Abstract: A central controller (40) executes a method (100) that selects and assigns channels to serve mobile subscriber units (30) in a space-based mobile telecommunication system (10). The method (100) is based on simultaneous consideration of a number of criteria that affect overall system performance of the mobile telecommunication system. Another method (200) assigns serving cells (15-18) by matching the available channel resources with actual caller demand as a function of time. The methods (100, 200) may be used in systems where the actual demand (i.e., offered subscriber traffic) and the number of channels available in each cell (15-18) is varying over time.
    Type: Grant
    Filed: July 14, 1995
    Date of Patent: May 5, 1998
    Assignee: Motorola, Inc.
    Inventors: Kadathur S. Natarajan, Yih G. Jan, Kenneth M. Peterson
  • Patent number: 5699355
    Abstract: System (10) and methods (100) assign satellite link access bandwidth upon demand as requested by a number of subscriber units (30). After receiving the connection request, a number of time slots being requested is determined. Next, if the maximum number of available time slots is greater than or equal to the number of time slots being requested plus the number of time slots already in use, the connection request is accepted and the number of requested time slots are allocated before communication begins. Otherwise the connection request is rejected and the subscriber unit (30) must try later.
    Type: Grant
    Filed: November 2, 1995
    Date of Patent: December 16, 1997
    Assignee: Motorola, Inc.
    Inventor: Kadathur S. Natarajan