Patents by Inventor Chandra Bontu

Chandra Bontu 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: 11108426
    Abstract: A wireless communication device receives an indication of timing alignment of a discontinuous reception (DRX) duration, determines a timing alignment for a reception/transmission (RX/TX) switching pattern of the wireless communication device based on the timing alignment of the DRX duration, and performs half-duplex (HD) communication with a radio access node according to the RX/TX switching pattern having the determined timing alignment.
    Type: Grant
    Filed: June 15, 2016
    Date of Patent: August 31, 2021
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Chandra Bontu, Prabaharan Kanesalingam, Patrick Lie Chin Cheong
  • Patent number: 10506479
    Abstract: A network node obtains capability information indicating whether neighbor network nodes support special user equipments (UEs), receives a measurement report for the neighbor network nodes from a special UE, and selects one of the network nodes as a target node for handover of the special UE based on the received measurement report and the obtained capability information.
    Type: Grant
    Filed: June 13, 2016
    Date of Patent: December 10, 2019
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Chandra Bontu, Prabaharan Kanesalingam, Patrick Lie Chin Cheong, Bing Hu Z
  • Patent number: 10492172
    Abstract: A network node may identify a location to be allocated for a multicast message within a transmission subframe based on at least information identifying the transmission subframe, and then transmit the multicast message at the identified location in the transmission subframe. A network node may also identify a transmission subframe in which to transmit a multicast message, allocate transmission resources in the transmission subframe for the multicast message, and transmit information indicating a location of the allocated transmission resources in the transmission subframe in a control signal message having a transmission power adjusted based on at least one of information identifying the transmission subframe and a code redundancy version of the multicast message.
    Type: Grant
    Filed: August 5, 2016
    Date of Patent: November 26, 2019
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Chandra Bontu, Prabaharan Kanesalingam, Patrick Lie Chin Cheong
  • Publication number: 20180220394
    Abstract: A network node may identify a location to be allocated for a multicast message within a transmission subframe based on at least information identifying the transmission subframe, and then transmit the multicast message at the identified location in the transmission subframe. A network node may also identify a transmission subframe in which to transmit a multicast message, allocate transmission resources in the transmission subframe for the multicast message, and transmit information indicating a location of the allocated transmission resources in the transmission subframe in a control signal message having a transmission power adjusted based on at least one of information identifying the transmission subframe and a code redundancy version of the multicast message.
    Type: Application
    Filed: August 5, 2016
    Publication date: August 2, 2018
    Applicant: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Chandra Bontu, Prabaharan Kanesalingam, Patrick Lie Chin Cheong
  • Publication number: 20180192335
    Abstract: A network node obtains capability information indicating whether neighbor network nodes support special user equipments (UEs), receives a measurement report for the neighbor network nodes from a special UE, and selects one of the network nodes as a target node for handover of the special UE based on the received measurement report and the obtained capability information.
    Type: Application
    Filed: June 13, 2016
    Publication date: July 5, 2018
    Inventors: Chandra BONTU, Prabaharan KANESALINGAM, Patrick LIE CHIN CHEONG, Bing HU Z
  • Publication number: 20180183485
    Abstract: A wireless communication device receives an indication of timing alignment of a discontinuous reception (DRX) duration, determines a timing alignment for a reception/transmission (RX/TX) switching pattern of the wireless communication device based on the timing alignment of the DRX duration, and performs half-duplex (HD) communication with a radio access node according to the RX/TX switching pattern having the determined timing alignment.
    Type: Application
    Filed: June 15, 2016
    Publication date: June 28, 2018
    Applicant: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Chandra BONTU, Prabaharan KANESALINGAM, Patrick LIE CHIN CHEONG
  • Patent number: 9485768
    Abstract: To allocate resources in an orthogonal frequency domain multiple access (OFDMA) system, two-dimensional rectangular regions are assigned in a frequency-time space to data bursts associated with mobile stations. At least one data burst does not fit in an available space in the frequency-time space is determined. In response to the determining, the assigned two-dimensional rectangular regions are reshaped.
    Type: Grant
    Filed: October 12, 2015
    Date of Patent: November 1, 2016
    Assignee: Apple Inc.
    Inventors: Chandra Bontu, Parsya Larijani, Mark Hawryluck
  • Publication number: 20160037518
    Abstract: To allocate resources in an orthogonal frequency domain multiple access (OFDMA) system, two-dimensional rectangular regions are assigned in a frequency-time space to data bursts associated with mobile stations. At least one data burst does not fit in an available space in the frequency-time space is determined. In response to the determining, the assigned two-dimensional rectangular regions are reshaped.
    Type: Application
    Filed: October 12, 2015
    Publication date: February 4, 2016
    Inventors: Chandra Bontu, Parsya Larijani, Mark Hawryluck
  • Patent number: 9191164
    Abstract: To allocate resources in an orthogonal frequency domain multiple access (OFDMA) system, two-dimensional rectangular regions are assigned in a frequency-time space to data bursts associated with mobile stations. At least one data burst does not fit in an available space in the frequency-time space is determined. In response to the determining, the assigned two-dimensional rectangular regions are reshaped.
    Type: Grant
    Filed: September 26, 2012
    Date of Patent: November 17, 2015
    Assignee: Apple Inc.
    Inventors: Chandra Bontu, Parsya Larijani, Mark Hawryluck
  • Patent number: 8977277
    Abstract: A method at a network node for obtaining spectrum sensing information, the method communicating to at least one of a user equipment and a sensing node at least one event condition for spectrum sensing; providing to the at least one of the user equipment and the sensing node channel descriptors for reporting; and receiving a report from the at least one of the user equipment and the sensing node utilizing the channel descriptors, the report indicating the at least one event condition has been met.
    Type: Grant
    Filed: August 30, 2012
    Date of Patent: March 10, 2015
    Assignee: BlackBerry Limited
    Inventors: Sophie Vrzic, Chandra Bontu, Shalini Suresh Periyalwar, David G. Steer
  • Publication number: 20130142100
    Abstract: A method at a user equipment and the user equipment, the method: obtaining an event having event conditions from system information multicasts of a plurality of network nodes; and sending an uplink message to at least one network node for any event whose conditions are satisfied utilizing resources allocated for the event. Also, a method at a network node and the network node, the method multicasting an event having event conditions to a plurality of user equipments; receiving a communication from a user equipment attached to the said network node or any neighbor network nodes, said communication providing an indication that the event conditions are met at the user equipment; compiling statistics, based on the receiving, of network conditions; and performing resource allocation based on the compiled statistics.
    Type: Application
    Filed: June 8, 2012
    Publication date: June 6, 2013
    Applicant: RESEARCH IN MOTION LIMITED
    Inventors: Sophie Vrzic, Chandra Bontu, David G. Steer
  • Patent number: 8300591
    Abstract: To allocate resources in an orthogonal frequency domain multiple access (OFDMA) system, two-dimensional rectangular regions are assigned in a frequency-time space to data bursts associated with mobile stations. At least one data burst does not fit in an available space in the frequency-time space is determined. In response to the determining, the assigned two-dimensional rectangular regions are reshaped.
    Type: Grant
    Filed: December 7, 2007
    Date of Patent: October 30, 2012
    Assignee: Apple Inc.
    Inventors: Chandra Bontu, Parsya Larijani, Mark Hawryluck
  • Publication number: 20110261786
    Abstract: A base station communicates, with a mobile station, data associated with a packet-switched session in which the mobile station is involved. In response to a handover request from the mobile station, the base station accesses information provisioned for the mobile station to determine whether the mobile station is to be subjected to mobility restriction. Based on the accessed information, the base station determines whether to allow handover of the mobile station. A message is sent to the mobile station to indicate that the requested handover is not allowed if the base station determines that the requested handover is not allowed.
    Type: Application
    Filed: April 22, 2009
    Publication date: October 27, 2011
    Inventors: Chandra Bontu, Surya Tenneti, Devaki Chandramouli, David Anderson
  • Patent number: 7899340
    Abstract: Methods and systems for compensating a frequency mismatch ?f between a local Oscillator (LO) of a coherent optical receiver and a carrier of a received optical signal. An average frequency of the LO is controlled to compensate at least long-period variations of the frequency mismatch. An electrical carrier recovery circuit for compensating short period variations of the frequency mismatch.
    Type: Grant
    Filed: April 7, 2006
    Date of Patent: March 1, 2011
    Assignee: Ciena Corporation
    Inventors: Chandra Bontu, Han Sun, Kim B Roberts, Kuang Tsan Wu
  • Patent number: 7894724
    Abstract: A method and system for averaging the effects of polarization distortions across a multitude of transmitted data streams in a dual polarization multiplexed optical communications system. Data streams are interleaved amongst each other in accordance with a predetermined pattern. The interleaved data streams are symbol mapped and modulated to provide a pair of optical signals. The pair of optical signals are orthogonally polarized, and multiplexed for transmission across an optical fiber. A receiver circuit receives the transmitted signal and extracts the interleaved data streams. The interleaved data streams are de-interleaved to generate the original data streams. While the data streams can be interleaved and transmitted via a single wavelength optical signal, the data streams can be interleaved and transmitted over two or more different wavelength optical signals to further mitigate the effects of polarization distortions.
    Type: Grant
    Filed: March 31, 2005
    Date of Patent: February 22, 2011
    Assignee: Ciena Corporation
    Inventors: Chandra Bontu, Leo Strawczynski
  • Patent number: 7894728
    Abstract: A method of compensating phase error between parallel digital signals of a received optical signal, in a coherent optical receiver. A phase differential between the digital signals is determined. A digital skew is imposed between the digital signals, an amount of skew imposed being an integer number of sample periods calculated to most nearly compensate the phase differential. The skewed digital signals are then digitally processed, in the frequency domain, to compensate a residual portion of the phase differential.
    Type: Grant
    Filed: October 17, 2006
    Date of Patent: February 22, 2011
    Assignee: Ciena Corporation
    Inventors: Han Sun, Chandra Bontu, Kim B. Roberts, John Sitch, John Wolczanski
  • Patent number: 7769305
    Abstract: In a coherent optical receiver, a frequency domain engine digitally processes at least two multi-bit sample streams of a received optical signal. The frequency domain engine includes a Fast Fourier Transform (FFT) filter for computing a complex vector representative of a frequency-domain spectrum of the received optical signal. A transpose and add block computes a vector sum of the complex vector and a transposed version of the complex vector, and an Inverse Fast Fourier Transform (IFFT) filter computes a complex output vector from the addition result. With this arrangement, parallel real filter operations are efficiently performed on each of the multi-bit sample streams, using a single back-to-back FFT-IFFT filter structure.
    Type: Grant
    Filed: September 21, 2006
    Date of Patent: August 3, 2010
    Assignee: Nortel Networks Limited
    Inventors: Kim B. Roberts, Han Sun, Chandra Bontu, Kuang Tsan Wu
  • Patent number: 7684712
    Abstract: A method of recovering a most likely value of each symbol transmitted through an optical communications network using a high speed optical signal. A stream of multi-bit digital samples of the optical signal is processed to generate a respective multi-bit estimate X?(n) of each transmitted symbol. A first function is applied to each symbol estimate X?(n) to generate a corresponding soft decision value {tilde over (X)}(n). Each soft decision value {tilde over (X)}(n) is processed to generate a corresponding hard decision value. {circumflex over (X)}(n) having an ideal amplitude and phase. A plurality of successive soft decision values and hard decision values are processed to determine a second function, which is applied to each soft decision value {tilde over (X)}(n) to generate a most likely symbol value {circumflex over ({circumflex over (X)}(n).
    Type: Grant
    Filed: October 20, 2006
    Date of Patent: March 23, 2010
    Assignee: Nortel Networks Limited
    Inventors: Kim B. Roberts, Chandra Bontu, Kuang Tsan Wu, Han Sun
  • Patent number: 7636525
    Abstract: A method and system for initializing a coherent optical receiver. Upon detection of an optical signal, a multi-bit digital sample stream of the optical signal is digitally processed to initialize each one of a plurality of adaptive control blocks of the coherent optical receiver. The adaptive control blocks include at least a dispersion compensation block and a clock recovery block. The dispersion compensation block is initialized before initializing the clock recovery block.
    Type: Grant
    Filed: June 13, 2006
    Date of Patent: December 22, 2009
    Assignee: Nortel Networks Limited
    Inventors: Chandra Bontu, Kim B. Roberts, Han Sun, Edgar Velez, Kuang Tsan Wu
  • Patent number: 7627252
    Abstract: A method of recovering a clock signal from an optical signal received through an optical communications system. A digital sample stream is processed to generate a dispersion compensated signal. The dispersion compensated signal is then tapped to obtain upper side band and lower side band signals of each received polarization of the optical signal. The upper side band and lower side band signals are then processed to compensate polarization dependent impairments, and the clock recovered from the resulting optimized.
    Type: Grant
    Filed: December 23, 2005
    Date of Patent: December 1, 2009
    Assignee: Nortel Networks Limited
    Inventors: Han Sun, Slobodan Jovanovic, Kuang Tsan Wu, Chandra Bontu, Kim B Roberts, Jianzhong Xu