Patents by Inventor Channasandra Ravishankar
Channasandra Ravishankar 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).
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Patent number: 11949162Abstract: An integrated HOFS meander line polarizer radome including: a substrate including layers having a dielectric constant (dk) greater than 2.0 and less than 5.0; a Higher Order Floquet-mode Structure (HOFS) may include HOFS lines disposed in a first subset of the layers; and meander lines, to provide a phase shift and match, disposed in a second subset of the layers, where at least one layer of the first subset is disposed between the second subset of the layers.Type: GrantFiled: February 23, 2021Date of Patent: April 2, 2024Assignee: Hughes Network Systems, LLCInventors: Michael J. Buckley, Channasandra Ravishankar
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Patent number: 11949495Abstract: A system and method for operating a hybrid 4G satellite network. The method includes providing a NGSG including a satellite AS/NAS stack, a terrestrial 4G stack and a relay to connect the satellite AS/NAS stack and the terrestrial 4G stack; transporting a 4G traffic between a 4G UE and the NGSG using a satellite air interface; utilizing a terrestrial network between the NGSG and a 4G CN to transport the 4G traffic; and mapping, with the relay, the 4G traffic between the satellite AS/NAS stack and the terrestrial 4G stack and vice versa, where the satellite air interface is better suited for satellite communications than the terrestrial network. A system and method for multiplexing a first-generation UE and a second-generation UE on a satellite channel.Type: GrantFiled: May 20, 2021Date of Patent: April 2, 2024Assignee: Hughes Network Systems, LLCInventors: Channasandra Ravishankar, James Jehong Jong, Gaguk Zakaria, Nassir Benammar
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Publication number: 20240107372Abstract: A method for communicating with a legacy terminal supporting a legacy air interface and a new terminal supporting a next generation air interface including: assigning a same carrier to the legacy terminal and the new terminal; receiving a terminal identifier and an optional payload for transmission at a MAC/RLC layer; determining if the terminal identifier is associated with the legacy terminal or the new terminal; composing, based on the determining, a burst header; formatting, a burst including the burst header and the optional payload; and transmitting the burst. In the method, the burst header is set to one of the one or more valid burst headers when the burst is associated with the legacy terminal, and the burst header is set to one of the one or more undefined burst headers when the burst is associated with the new terminal.Type: ApplicationFiled: October 3, 2023Publication date: March 28, 2024Inventors: James J. JONG, Channasandra RAVISHANKAR, William WHITMARSH, Nassir BENAMMAR, Santharam GURUMANI, Pablo VALLE, Jianxia LUO
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Publication number: 20240089823Abstract: A smart network edge (SNE) selectively mutes data packets via an optimal data path using available networks, either terrestrial or non-terrestrial. The SNE includes: a processor; a memory storing programming for the processor, a steerable antenna; and a number of modems corresponding to gateways in the available networks. The SNE is programmed to determine one or more selected data paths for data packets of a session based on avoiding or mitigating inter-constellation interference.Type: ApplicationFiled: June 30, 2023Publication date: March 14, 2024Applicant: Hughes Network Systems, LLCInventors: Rajeev GOPAL, Channasandra RAVISHANKAR, Xiaoling HUANG
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Patent number: 11916654Abstract: A satellite communication system that combines the benefits of Medium Earth Orbit (MEO) and Low Earth Orbit (LEO) satellite systems into an MEO-LEO satellite system. The MEO-LEO system includes an LEO constellation combined with a MEO constellation where the LEO constellation may provide global coverage with broad average capacity and may support ‘hot spot’ coverage where desired. The MEO constellation may provide unique advantages including backhaul to ground in remote areas, higher traffic density for key locations, and a secure global backhaul for key customers. Data may be routed over optical inter-satellite links using Software Defined Networking concepts to provide MEO-LEO (backhaul and ground access), LEO-LEO (upstream & downstream); and (3) MEO-MEO (crosslinks & downlinks). Further, implementations described herein include secure user terminal (UT) to UT IP routing in the constellation for direct UT to UT communication.Type: GrantFiled: November 26, 2021Date of Patent: February 27, 2024Assignee: HUGHES NETWORK SYSTEMS, LLCInventors: Channasandra Ravishankar, Xiaoling Huang, John E. Corrigan, III
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Publication number: 20240031949Abstract: An adaptive transmit power control process enables the uplink transmit power of a user terminal to be adjusted based on a scan angle of the antenna for the user terminal. The antenna periodically reports the scan angle to the user terminal, and a current maximum transmit power for the user terminal is determined based on the scan angle. The current maximum transmit power is then used as the basis for determining an allocation of resources to the user terminal. The transmit power control process enables resources to be assigned as needed across multiple carriers and enables a power spectral density of a user terminal to be adjusted based on nominal and offset transmit power parameters.Type: ApplicationFiled: February 17, 2023Publication date: January 25, 2024Applicant: Hughes Network Systems, LLCInventors: Nassir BENAMMAR, Xiaoling HUANG, Channasandra RAVISHANKAR, John E. CORRIGAN, III
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Patent number: 11811494Abstract: Embodiments disclosed herein relate generally to techniques for mitigating blockages associated with satellite systems. More specifically, techniques disclosed herein, describe solutions for minimizing service interruption during satellite handover. One or more blockages associated with one or more user terminals that connect to a satellite system may be determined by various means. Utilizing those blockages, handover times for the one or more user terminals may be determined such that service interrupts may be minimized.Type: GrantFiled: February 28, 2023Date of Patent: November 7, 2023Assignee: Hughes Network Systems, LLCInventors: Channasandra Ravishankar, John Corrigan, Deepak Arur
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Patent number: 11778508Abstract: A method for communicating with a legacy terminal supporting a legacy air interface and a new terminal supporting a next generation air interface including: assigning a same carrier to the legacy terminal and the new terminal; receiving a terminal identifier and an optional payload for transmission at a MAC/RLC layer; determining if the terminal identifier is associated with the legacy terminal or the new terminal; composing, based on the determining, a burst header; formatting, a burst including the burst header and the optional payload; and transmitting the burst. In the method, the burst header is set to one of the one or more valid burst headers when the burst is associated with the legacy terminal, and the burst header is set to one of the one or more undefined burst headers when the burst is associated with the new terminal.Type: GrantFiled: February 23, 2021Date of Patent: October 3, 2023Assignee: Hughes Network Systems, LLCInventors: James J. Jong, Channasandra Ravishankar, William Whitmarsh, Nassir Benammar, Santharam Gurumani, Pablo Valle, Jianxia Luo
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Patent number: 11777618Abstract: Techniques described herein provide phase and amplitude calibration of phased array antennas. In an N-by-M phased array having N*M channels, embodiments use aggregated measurements over multiple concurrently active channels to improve signal-to-leakage performance, while also using sequences of exclusion groups to yield an individualized calibration value for each channel (i.e., N*M individualized calibration values). For example, a J×K channel group of the array is selected in each of a sequence of measurement frames based on a calibration schema. Over J*K measurement sub-frames, a set of J*K aggregate measurements is obtained, each with different subsets of the channel group activated and excluded from the measurement. The aggregate calibration measurements can be used to compute J*K individualized calibration values, each for a channel of the channel group. In some implementations, each calibration value is computed as a complex value including both amplitude and phase calibrations information.Type: GrantFiled: December 27, 2021Date of Patent: October 3, 2023Assignee: Hughes Network Systems, LLCInventors: Xiaoling Huang, Channasandra Ravishankar
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Patent number: 11764866Abstract: Satellite communication systems and methods are disclosed herein. In an embodiment, a satellite communication system includes a user terminal and a gateway. The user terminal includes a terminal antenna and a terminal controller. The terminal antenna enables the user terminal to communicate via each of a first satellite and a second satellite. The gateway includes a gateway antenna and a gateway controller. The gateway antenna enables the gateway to communicate with the user terminal via each of the first satellite and the second satellite. At least one of the terminal controller and the gateway controller is configured to adjust a queue management policy during a handover operation from the first satellite to the second satellite.Type: GrantFiled: December 29, 2021Date of Patent: September 19, 2023Assignee: HUGHES NETWORK SYSTEMS, LLCInventors: Nassir Benammar, Channasandra Ravishankar
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Publication number: 20230275649Abstract: MAC layer enhancements in protocol stacks of a user terminal of a satellite communication system such as a 5G based system. The MAC layer may include a scheduler that allows resource aggregation by allocating additional radio resources to users on one beam using carriers allocated to an adjacent beam. The MAC layer enhancements may also provide user terminals the ability to report their battery status to the scheduler which can then send signals to the user terminal that allow the terminal to shut down electronics to conserve power resources based on the battery status.Type: ApplicationFiled: August 12, 2022Publication date: August 31, 2023Applicant: HUGHES NETWORK SYSTEMS LLCInventors: Channasandra RAVISHANKAR, Gaguk ZAKARIA, John E. CORRIGAN, III
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Patent number: 11700558Abstract: Systems and methods for facilitating handover reduction in satellite systems are disclosed. A system may include a processor and a memory storing instructions, which when executed by the processor, may cause the processor to detect a user terminal that is selected for a handover procedure. The handover procedure may facilitate a switch from a source beam to a target beam. Based on input data, the processor may evaluate an ideal time value pertaining to a pre-defined time instance at which a scheduled handover is to be performed. The scheduled handover may correspond to at least one of a scheduled change in operating frequency within same beam or a scheduled feeder link handover due to a change in gateway communicating with the satellite. Based on the evaluation and the input data, the processor may estimate an optimized time value that pertains to an optimized time instance associated with an expected handover reduction.Type: GrantFiled: December 28, 2021Date of Patent: July 11, 2023Assignee: Hughes Network Systems, LLCInventors: Gautham Bharadwaj, Subramanya Bayar Krishna, Deepak Manohar Arur, Channasandra Ravishankar, Charles A. Barnett
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Publication number: 20230208512Abstract: Satellite communication systems and methods are disclosed herein. In an embodiment, a satellite communication system includes a user terminal and a gateway. The user terminal includes a terminal antenna and a terminal controller. The terminal antenna enables the user terminal to communicate via each of a first satellite and a second satellite. The gateway includes a gateway antenna and a gateway controller. The gateway antenna enables the gateway to communicate with the user terminal via each of the first satellite and the second satellite. At least one of the terminal controller and the gateway controller is configured to adjust a queue management policy during a handover operation from the first satellite to the second satellite.Type: ApplicationFiled: December 29, 2021Publication date: June 29, 2023Inventors: Nassir BENAMMAR, Channasandra RAVISHANKAR
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Publication number: 20230209417Abstract: Systems and methods for facilitating handover reduction in satellite systems are disclosed. A system may include a processor and a memory storing instructions, which when executed by the processor, may cause the processor to detect a user terminal that is selected for a handover procedure. The handover procedure may facilitate a switch from a source beam to a target beam. Based on input data, the processor may evaluate an ideal time value pertaining to a pre-defined time instance at which a scheduled handover is to be performed. The scheduled handover may correspond to at least one of a scheduled change in operating frequency within same beam or a scheduled feeder link handover due to a change in gateway communicating with the satellite. Based on the evaluation and the input data, the processor may estimate an optimized time value that pertains to an optimized time instance associated with an expected handover reduction.Type: ApplicationFiled: December 28, 2021Publication date: June 29, 2023Applicant: Hughes Network Systems, LLCInventors: Gautham BHARADWAJ, Subramanya Bayar KRISHNA, Deepak Manohar ARUR, Channasandra RAVISHANKAR, Charles A. BARNETT
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Publication number: 20230208513Abstract: Embodiments disclosed herein relate generally to techniques for mitigating blockages associated with satellite systems. More specifically, techniques disclosed herein, describe solutions for minimizing service interruption during satellite handover. One or more blockages associated with one or more user terminals that connect to a satellite system may be determined by various means. Utilizing those blockages, handover times for the one or more user terminals may be determined such that service interrupts may be minimized.Type: ApplicationFiled: February 28, 2023Publication date: June 29, 2023Inventors: Channasandra Ravishankar, John Corrigan, Deepak Arur
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Publication number: 20230180193Abstract: A system and method for communicating with an Internet Of Things (IoT) device via a satellite link. The method includes assigning a transmission mode to a physical channel, where the physical channel supports multiple timeslot durations and the transmission mode is selected from a single user (SU) or a multi-user (MU); selecting a timeslot duration from the multiple durations for a payload; obtaining, when the transmission mode is SU, a timeslot grant for use of the physical channel for the timeslot duration; and transmitting a burst including the payload, where the burst is transmitted synchronized with the timeslot grant when the transmission mode is SU and the burst is transmitted without synchronization when the transmission mode is MU.Type: ApplicationFiled: February 7, 2023Publication date: June 8, 2023Inventors: James Jehong JONG, Channasandra RAVISHANKAR, William WHITMARSH
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Patent number: 11632194Abstract: A receiver and a method for receiving a radio communication is disclosed. The method includes receiving a burst encoded with a robust modulation coding scheme (MCS) as RX signals; generating, for each of the RX signals, a burst SNR, soft decision symbols and a packet; weighing, each of soft decision symbols with a respective burst SNR, to calculate soft combined symbols that are used to generate a Maximal-Ratio Combining (MRC) packet; and selecting, from the packets and the MRC packet, a CRC passed packet as an output. An adaptive dual burst transmitter is disclosed.Type: GrantFiled: July 8, 2021Date of Patent: April 18, 2023Assignee: Hughes Network Systems, LLCInventors: James Jehong Jong, Channasandra Ravishankar, William Whitmarsh
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Patent number: 11621772Abstract: Embodiments disclosed herein relate generally to techniques for mitigating blockages associated with satellite systems. More specifically, techniques disclosed herein, describe solutions for minimizing service interruption during satellite handover. One or more blockages associated with one or more user terminals that connect to a satellite system may be determined by various means. Utilizing those blockages, handover times for the one or more user terminals may be determined such that service interrupts may be minimized.Type: GrantFiled: May 21, 2021Date of Patent: April 4, 2023Assignee: Hughes Network Systems, LLCInventors: Channasandra Ravishankar, John Corrigan, Deepak Arur
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Publication number: 20230081094Abstract: Techniques described herein provide phase and amplitude calibration of phased array antennas. In an N-by-M phased array having N*M channels, embodiments use aggregated measurements over multiple concurrently active channels to improve signal-to-leakage performance, while also using sequences of exclusion groups to yield an individualized calibration value for each channel (i.e., N*M individualized calibration values). For example, a J×K channel group of the array is selected in each of a sequence of measurement frames based on a calibration schema. Over J*K measurement sub-frames, a set of J*K aggregate measurements is obtained, each with different subsets of the channel group activated and excluded from the measurement. The aggregate calibration measurements can be used to compute J*K individualized calibration values, each for a channel of the channel group. In some implementations, each calibration value is computed as a complex value including both amplitude and phase calibrations information.Type: ApplicationFiled: December 27, 2021Publication date: March 16, 2023Inventors: Xiaoling Huang, Channasandra Ravishankar
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Patent number: 11606779Abstract: A system and method for communicating with an Internet Of Things (IoT) device via a satellite link. The method includes assigning a transmission mode to a physical channel, where the physical channel supports multiple timeslot durations and the transmission mode is selected from a single user (SU) or a multi-user (MU); selecting a timeslot duration from the multiple durations for a payload; obtaining, when the transmission mode is SU, a timeslot grant for use of the physical channel for the timeslot duration; and transmitting a burst including the payload, where the burst is transmitted synchronized with the timeslot grant when the transmission mode is SU and the burst is transmitted without synchronization when the transmission mode is MU.Type: GrantFiled: May 20, 2021Date of Patent: March 14, 2023Assignee: Hughes Network Systems, LLCInventors: James Jehong Jong, Channasandra Ravishankar, William Whitmarsh