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公开(公告)号：US12088398B1
公开(公告)日：2024-09-10
申请号：US17186627
申请日：2021-02-26
Applicant: Space Exploration Technologies Corp.
Inventor： Martin S. McCormick , Torbjorn Larsson , Alazar Tamrat , Jeffrey C. Strait , Chen Chen , Philip J. Treigherman , Stephan O. Roche , Ronald Gottula
CPC classification number: H04B7/18513 , H04B7/18517 , H04L5/001 , H04L25/0202 , H04L27/0014 , H04L27/2636 , H04L2027/0026
Abstract: A modem is configurable on a satellite, user terminal or gateway generates a radio frequency (RF) signal using an orthogonal frequency division multiplexing (OFDM) protocol including a radio frame including one or more bursts. A burst of the one or more bursts includes a first portion including burst detection data, a second portion including channel characteristic estimation data, a third portion including payload data, and fourth and fifth portions including pilot data. The first portion in a time domain is included in the burst prior to the second, third, fourth, and fifth portions. The first portion can include a pseudo-random noise sequence inserted in the time domain. The same physical modem can be configured to transmit signals on an uplink or downlink between a user terminal and a satellite or on the uplink or downlink between the satellite and the gateway.
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公开(公告)号：US12074683B1
公开(公告)日：2024-08-27
申请号：US17186706
申请日：2021-02-26
Applicant: Space Exploration Technologies Corp.
Inventor： Martin S. McCormick , Torbjorn Larsson , Alazar Tamrat , Jeffrey C. Strait , Chen Chen , Philip J. Treigherman , Stephan O. Roche , Ronald Gottula
IPC: H04B7/185 , H04L5/00 , H04W72/0453
CPC classification number: H04B7/18513 , H04L5/0048 , H04W72/0453
Abstract: A modem is configurable on a satellite, user terminal or gateway generates a radio frequency (RF) signal using an orthogonal frequency division multiplexing (OFDM) protocol including a radio frame including one or more bursts. A burst of the one or more bursts includes a first portion including burst detection data, a second portion including channel characteristic estimation data, a third portion including payload data, and fourth and fifth portions including pilot data. The first portion in a time domain is included in the burst prior to the second, third, fourth, and fifth portions. The first portion can include a pseudo-random noise sequence inserted in the time domain. The same physical modem can be configured to transmit signals on an uplink or downlink between a user terminal and a satellite or on the uplink or downlink between the satellite and the gateway.
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公开(公告)号：US20240040601A1
公开(公告)日：2024-02-01
申请号：US18486035
申请日：2023-10-12
Applicant: Space Exploration Technologies Corp.
Inventor： Jayasuryan V. Iyer , Yashodhan Dandekar , Khasim Shaheed Shaik Mahammad , Ramakrishna Akella , Chen Chen , Phillip E. Barber , Peter J. Worters
IPC: H04W72/54 , H04B17/382 , H04B17/336 , H04L1/00 , H04W72/21
CPC classification number: H04W72/54 , H04B17/382 , H04B17/336 , H04L1/0009 , H04L1/0003 , H04W72/21
Abstract: A method for downlink link adaptation includes receiving, from a satellite and at a user terminal, a first data packet data unit according to a first downlink modulation and coding scheme (MCS), computing error vector magnitude data associated with the first data packet data unit, generating, based on one or more of the error vector magnitude data, user terminal signal-to-noise-ratio feedback based on a constant times a previous user terminal signal-to-noise-ratio and a current user terminal signal-to-noise-ratio, and transmitting an uplink packet data unit having a downlink block error rate and the user terminal signal-to-noise-ratio feedback. A satellite runs a link adaptation algorithm based on the user terminal signal-to-noise-ratio feedback and block error rate to generate a second downlink MCS. The method includes receiving at the user terminal a second data packet data unit according to the second downlink MCS for the satellite-to-user-terminal downlink. Uplink link adaptation is also disclosed.
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公开(公告)号：US11792832B1
公开(公告)日：2023-10-17
申请号：US17338518
申请日：2021-06-03
Applicant: Space Exploration Technologies Corp.
Inventor： Jayasuryan V. Iyer , Yashodhan Dandekar , Khasim Shaheed Shaik Mahammad , Ramakrishna Akella , Chen Chen , Phillip E. Barber , Peter J. Worters
IPC: H04W72/10 , H04W72/54 , H04B17/382 , H04B17/336 , H04L1/00 , H04W72/21
CPC classification number: H04W72/54 , H04B17/336 , H04B17/382 , H04L1/0003 , H04L1/0009 , H04W72/21
Abstract: A method for downlink link adaptation includes receiving, from a satellite and at a user terminal, a first data packet data unit according to a first downlink modulation and coding scheme (MCS), computing an error vector magnitude data associated with the first data packet data unit, generating, based on one or more of the error vector magnitude data, user terminal signal-to-noise-ratio feedback based on a constant times a previous user terminal signal-to-noise-ratio and a current user terminal signal-to-noise-ratio, and transmitting an uplink packet data unit having a downlink block error rate and the user terminal signal-to-noise-ratio feedback. A satellite runs a link adaptation algorithm based on the user terminal signal-to-noise-ratio feedback and block error rate to generate a second downlink MCS. The method includes receiving at the user terminal a second data packet data unit according to the second downlink MCS for the user terminal. An uplink link adaptation algorithm is also disclosed.
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公开(公告)号：US11729684B1
公开(公告)日：2023-08-15
申请号：US17337214
申请日：2021-06-02
Applicant: Space Exploration Technologies Corp.
Inventor： Chen Chen , Pavel Chikulaev , Sergii Ziuzin , David Sacks , Peter J. Worters , Darshan Purohit , Yashodhan Dandekar , Vladimir Skuratovich , Andrei Pushkin , Phillip E. Barber
CPC classification number: H04W36/06 , H04B7/0695 , H04B7/18513 , H04W36/08
Abstract: Systems, methods, and non-transitory media are provided for low latency handovers. An example method can include receiving, by a user terminal associated with a cell served by a satellite, a schedule of communications between the user terminal and one or more satellites; requesting, based on the schedule, a handover from a beam of the satellite to a different beam of one of the satellite or a different satellite; processing packets transmitted over the beam of the satellite and/or the different beam of the one of the satellite or the different satellite; performing the handover from the beam of the satellite to the different beam of the one of the satellite or the different satellite; and after the handover, transmitting, by the user terminal, one or more packets via the different beam of the one of the satellite or the different satellite.
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Patent Agency Ranking
公开(公告)号：US11540301B1
公开(公告)日：2022-12-27
申请号：US17338522
申请日：2021-06-03
Applicant: Space Exploration Technologies Corp.
Inventor： Jayasuryan V. Iyer , Khasim Shaheed Shaik Mahammad , Yashodhan Dandekar , Ramakrishna Akella , Chen Chen , Phillip E. Barber , Peter J. Worters
Abstract: A method of operating an uplink scheduler as part of a medium access control scheduler on a satellite includes selecting, from a plurality of user terminals, a first number of zero-bandwidth request user terminals from the plurality of user terminals, selecting, from the plurality of user terminals, a second number of non-zero-bandwidth request user terminals from the plurality of user terminals, binning the second number of non-zero-bandwidth request user terminals into a plurality of bins based on a respective bandwidth requirement for each non-zero-bandwidth request user terminal and based on a minimum user terminal grant and allocating, according to a grant allocation algorithm, a respective grant of radio resources in an uplink frame to each user terminal of the plurality of user terminals into a respective bin of the plurality of bins in an order associated with increasing bandwidth needs. A downlink scheduler is also disclosed.
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公开(公告)号：US12244396B1
公开(公告)日：2025-03-04
申请号：US17186579
申请日：2021-02-26
Applicant: Space Exploration Technologies Corp.
Inventor： Martin S. McCormick , Torbjorn Larsson , Alazar Tamrat , Jeffrey C. Strait , Chen Chen , Philip J. Treigherman , Stephan O. Roche , Ronald Gottula
IPC: H04B7/185 , H04L5/00 , H04W72/0453
Abstract: A modem is configurable on a satellite, user terminal or gateway generates a radio frequency (RF) signal using an orthogonal frequency division multiplexing (OFDM) protocol including a radio frame including one or more bursts. A burst of the one or more bursts includes a first portion including burst detection data, a second portion including channel characteristic estimation data, a third portion including payload data, and fourth and fifth portions including pilot data. The first portion in a time domain is included in the burst prior to the second, third, fourth, and fifth portions. The first portion can include a pseudo-random noise sequence inserted in the time domain. The same physical modem can be configured to transmit signals on an uplink or downlink between a user terminal and a satellite or on the uplink or downlink between the satellite and the gateway.
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公开(公告)号：US12218742B2
公开(公告)日：2025-02-04
申请号：US18230493
申请日：2023-08-04
Applicant: Space Exploration Technologies Corp.
Inventor： Chen Chen , Darshan Purohit , Yashodhan Dandekar , Pavel Chikulaev , David Sacks , Peter J. Worters , Phillip E. Barber
Abstract: In an embodiment, a user terminal includes a communication module (CM) configured to generate an initial network entry request; an antenna assembly configured to find, in response to the initial network entry request, a satellite based on a search of a sky. The search of the sky includes sequentially changing a beam pointing direction of the antenna assembly. The satellite is assigned to downlink to a geographic cell associated with the user terminal. The user terminal includes a media access control (MAC) layer component configured to generate an uplink radio frame including a random access channel (RACH) request associated with the initial network entry request at a particular portion of the uplink radio frame for the satellite.
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公开(公告)号：US12003350B1
公开(公告)日：2024-06-04
申请号：US17186657
申请日：2021-02-26
Applicant: Space Exploration Technologies Corp.
Inventor： Martin S. McCormick , Torbjorn Larsson , Alazar Tamrat , Jeffrey C. Strait , Chen Chen , Philip J. Treigherman , Stephan O. Roche , Ronald Gottula
IPC: H04L25/02 , H04B7/185 , H04L5/00 , H04W72/044
CPC classification number: H04L25/0202 , H04B7/1851 , H04L5/0048 , H04W72/044
Abstract: A modem is configurable on a satellite, user terminal or gateway generates a radio frequency (RF) signal using an orthogonal frequency division multiplexing (OFDM) protocol including a radio frame including one or more bursts. A burst of the one or more bursts includes a first portion including burst detection data, a second portion including channel characteristic estimation data, a third portion including payload data, and fourth and fifth portions including pilot data. The first portion in a time domain is included in the burst prior to the second, third, fourth, and fifth portions. The first portion can include a pseudo-random noise sequence inserted in the time domain. The same physical modem can be configured to transmit signals on an uplink or downlink between a user terminal and a satellite or on the uplink or downlink between the satellite and the gateway.
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公开(公告)号：US20240064795A1
公开(公告)日：2024-02-22
申请号：US18240913
申请日：2023-08-31
Applicant: Space Exploration Technologies Corp.
Inventor： Jayasuryan V. Iyer , Khasim Shaheed Shaik Mahammad , Yashodhan Dandekar , Ramakrishna Akella , Chen Chen , Phillip E. Barber , Peter J. Worters
IPC: H04W72/543 , H04W72/1268 , H04W72/23
CPC classification number: H04W72/543 , H04W72/1268 , H04W72/23 , H04L1/0009
Abstract: A method of operating an uplink scheduler as part of a medium access control scheduler on a satellite includes selecting, from a plurality of user terminals, a first number of zero-bandwidth request user terminals from the plurality of user terminals, selecting, from the plurality of user terminals, a second number of non-zero-bandwidth request user terminals from the plurality of user terminals, binning the second number of non-zero-bandwidth request user terminals into a plurality of bins based on a respective bandwidth requirement for each non-zero-bandwidth request user terminal and based on a minimum user terminal grant and allocating, according to a grant allocation algorithm, a respective grant of radio resources in an uplink frame to each user terminal of the plurality of user terminals into a respective bin of the plurality of bins in an order associated with increasing bandwidth needs. A downlink scheduler is also disclosed.
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