Patents by Inventor Sudarshan Rao

Sudarshan Rao 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: 8675550
    Abstract: An enhanced access terminal (AT) that can serve as a “proxy wireless over-the-air backhaul or relay” is provided, to connect a base station with no backhaul to its neighboring fully functional base station that is connected to the NMS. In a further embodiment, an architecture and protocol for storing and retrieving data at the base station lacking backhaul is provided, and, using that information, a mechanism by which the ATR can communicate the format information to the source to improve interference cancellation at the base station lacking backhaul, and neighboring base stations, due to backhaul transmission from the AT's routing and relaying capability.
    Type: Grant
    Filed: December 31, 2008
    Date of Patent: March 18, 2014
    Assignee: Alcatel Lucent
    Inventors: Sudarshan A Rao, Subramanian Vasudevan, Jialin Zou
  • Patent number: 8520559
    Abstract: An access-terminal routing methodology is provided that may be used to enable a wireless, meshed backhaul between base stations using existing wireless-access resources (time, bandwidth, code-space, power), protocols, and base station infrastructure. Accordingly, the invention provides a means to extend the coverage of existing networks by adding standalone base stations without wired or specialized wireless backhaul.
    Type: Grant
    Filed: September 30, 2008
    Date of Patent: August 27, 2013
    Assignee: Alcatel Lucent
    Inventors: Sudarshan A Rao, Subramanian Vasudevan
  • Patent number: 8218477
    Abstract: A wireless communication system includes the ability to determine that a fault condition associated with at least a portion of a cell associated with a base station is likely. Disclosed examples include using information regarding call activity levels of various portions of a cell for determining an expected call activity level for at least one portion of the cell. One example includes using the least active portion of the cell as the portion of interest. Previously observed activity levels provide information to automatically determine an expected relationship between the activity levels of the portions of the cell. Disclosed examples include determining whether a deviation between the actual call activity level and the expected call activity level is statistically significant enough to indicate a fault condition with at least the portion of the cell, which is of interest.
    Type: Grant
    Filed: March 31, 2005
    Date of Patent: July 10, 2012
    Assignee: Alcatel Lucent
    Inventor: Sudarshan A. Rao
  • Patent number: 8102785
    Abstract: The present invention provides a method of calibrating base station comprising a plurality of antennas and operating in an Orthogonal Frequency Division Multiplex (OFDM) and Time Division Duplex (TDD) mode. One embodiment of the method includes a method of calibrating a base station comprising a plurality of antennas for beamsteering forward link traffic data to a target mobile in a TDD wireless communication system. Each antenna is connected to a corresponding radio via a transmit/receive switch that is configured to switch between a receive path and a transmit path. The method includes transmitting a first signal from a first radio via a first cross-over cable coupled to the first radio and a second radio such that the first signal is received by the second radio. The method also includes transmitting a second signal from the second radio via a second cross-over cable coupled between the first and second radios such that the second signal is received by the first radio.
    Type: Grant
    Filed: May 21, 2008
    Date of Patent: January 24, 2012
    Assignee: Alcatel Lucent
    Inventors: Sudarshan A. Rao, Kam Hung Wu, Yifei Yuan
  • Publication number: 20090310527
    Abstract: An enhanced access terminal (AT) that can serve as a “proxy wireless over-the-air backhaul or relay” is provided, to connect a base station with no backhaul to its neighboring fully functional base station that is connected to the NMS. In a further embodiment, an architecture and protocol for storing and retrieving data at the base station lacking backhaul is provided, and, using that information, a mechanism by which the ATR can communicate the format information to the source to improve interference cancellation at the base station lacking backhaul, and neighboring base stations, due to backhaul transmission from the AT's routing and relaying capability.
    Type: Application
    Filed: December 31, 2008
    Publication date: December 17, 2009
    Inventors: Sudarshan A. Rao, Subramanian Vasudevan, Jialin Zou
  • Publication number: 20090290517
    Abstract: The present invention provides a method of calibrating base station comprising a plurality of antennas and operating in an Orthogonal Frequency Division Multiplex (OFDM) and Time Division Duplex (TDD) mode. One embodiment of the method includes a method of calibrating a base station comprising a plurality of antennas for beamsteering forward link traffic data to a target mobile in a TDD wireless communication system. Each antenna is connected to a corresponding radio via a transmit/receive switch that is configured to switch between a receive path and a transmit path. The method includes transmitting a first signal from a first radio via a first cross-over cable coupled to the first radio and a second radio such that the first signal is received by the second radio. The method also includes transmitting a second signal from the second radio via a second cross-over cable coupled between the first and second radios such that the second signal is received by the first radio.
    Type: Application
    Filed: May 21, 2008
    Publication date: November 26, 2009
    Inventors: Sudarshan A. RAO, Kam Hung WU, Yifei YUAN
  • Publication number: 20090285133
    Abstract: An enhanced access terminal (AT) that can serve as a “proxy wireless over-the-air backhaul or relay” is provided, to connect a base station with no backhaul to its neighboring fully functional base station that is connected to the NMS. In a further embodiment, a method is provided for management of the base station with no backhaul via communications links established using the enhanced access terminal.
    Type: Application
    Filed: December 31, 2008
    Publication date: November 19, 2009
    Inventors: Sudarshan A. Rao, Subramanian Vasudevan, Jialin Zou
  • Publication number: 20090279461
    Abstract: An enhanced access terminal (AT) that can serve as a “proxy wireless over-the-air backhaul or relay” is provided, to connect a base station with no backhaul to its neighboring fully functional base station that is connected to the NMS. In a further embodiment, the AT routing and relaying capability provided by the invention is extended to new OFDM based air-interface technologies being considered for 4th generation cellular standards such as LTE, UMB and WiMAX.
    Type: Application
    Filed: December 31, 2008
    Publication date: November 12, 2009
    Inventors: Sudarshan A. Rao, Subramanian Vasudevan, Jialin Zou
  • Publication number: 20090252088
    Abstract: An access-terminal routing methodology is provided that may be used to enable a wireless, meshed backhaul between base stations using existing wireless-access resources (time, bandwidth, code-space, power), protocols, and base station infrastructure. Accordingly, the invention provides a means to extend the coverage of existing networks by adding standalone base stations without wired or specialized wireless backhaul.
    Type: Application
    Filed: September 30, 2008
    Publication date: October 8, 2009
    Inventors: Sudarshan A. Rao, Subramanian Vasudevan
  • Publication number: 20060221886
    Abstract: A wireless communication system includes the ability to determine that a fault condition associated with at least a portion of a cell associated with a base station is likely. Disclosed examples include using information regarding call activity levels of various portions of a cell for determining an expected call activity level for at least one portion of the cell. One example includes using the least active portion of the cell as the portion of interest. Previously observed activity levels provide information to automatically determine an expected relationship between the activity levels of the portions of the cell. Disclosed examples include determining whether a deviation between the actual call activity level and the expected call activity level is statistically significant enough to indicate a fault condition with at least the portion of the cell, which is of interest.
    Type: Application
    Filed: March 31, 2005
    Publication date: October 5, 2006
    Inventor: Sudarshan Rao
  • Publication number: 20060063521
    Abstract: A wireless communication system (20) includes a monitoring module (34) that is capable of detecting at least one type of fault scenario in the system. In a disclosed example, sleeping cells (24-30) are detected by determining a deviation between actual cell performance and an expected cell performance. The disclosed examples include automatically determining the expected cell performance and automatically determining any deviation between the actual cell performance and the expected cell performance. Statistical analysis provides an indication whether a determined deviation is indicative of a fault condition.
    Type: Application
    Filed: September 21, 2004
    Publication date: March 23, 2006
    Inventors: Benjamin Cheung, Stacy Fishkin, Gopal Kumar, Sudarshan Rao