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公开(公告)号：US12177009B1
公开(公告)日：2024-12-24
申请号：US17339807
申请日：2021-06-04
Applicant: Space Exploration Technologies Corp.
Inventor： Jeffrey A. Gardner , Yashodhan Dandekar , Ramakrishna Akella , Khasim Shaheed Shaik Mahammad
Abstract: Systems, methods, and techniques are provided for a radio link control (RLC) sublayer. An example satellite or user terminal can include a divisional of layer 2 of the OSI protocol layer structure. An example method includes providing a RLC sublayer on top of a MAC sublayer and adaptively switching, via the RLC sublayer and based on external data, between an unacknowledged mode and an acknowledged mode for the electronic communications. If the RLC sublayer is operating in the unacknowledged mode, the RLC sublayer provides one or more of (1) fragmentation and reassembly of service data units; (2) a use of RLC headers; and/or (3) no delivery guarantees. If the RLC sublayer is operating in the acknowledged mode, the RLC sublayer provides reliability in a sequence delivery service and one or more of (1) fragmentation and reassembly of service data units; and/or (2) the use of RLC headers.
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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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公开(公告)号：US20230396324A1
公开(公告)日：2023-12-07
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
CPC classification number: H04B7/18513 , H04W74/0833 , H04W74/004 , H04W72/21 , H04L5/0007
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：US11949496B1
公开(公告)日：2024-04-02
申请号：US17337218
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: H04B7/18541 , H04B7/18513 , H04W36/0016 , H04W36/08 , H04W88/16
Abstract: Systems, methods, and non-transitory media are provided for low latency handovers. An example method can include receiving, by a satellite, a schedule of communications between the satellite and one or more gateways; requesting, based on the schedule, a handover from a link between the satellite and a gateway to a different link between the satellite and the gateway or a different gateway; prior to a completion of the handover, processing packets bicasted over the link between the satellite and the gateway and the different link between the satellite and the gateway or the different gateway; performing the handover from the link between the satellite and the gateway to the different link between the satellite and the gateway or the different gateway; and after the handover, transmitting, by the satellite, one or more packets via the different link between the satellite and the gateway or the different gateway.
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公开(公告)号：US11800552B1
公开(公告)日：2023-10-24
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
IPC: H04W72/12 , H04W72/543 , H04W72/1268 , H04W72/23 , H04L1/00
CPC classification number: H04W72/543 , H04W72/1268 , H04W72/23 , H04L1/0003 , 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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Patent Agency Ranking
公开(公告)号：US20240031892A1
公开(公告)日：2024-01-25
申请号：US18231564
申请日：2023-08-08
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 , H04W36/08 , H04B7/0695 , H04B7/18513
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, wherein the one or more satellites comprises the satellite and a different satellite, and wherein the schedule of communications is obtained by the user terminal from the satellite; requesting, based on the schedule, a handover from a beam of the satellite to a different beam of 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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公开(公告)号：US11757526B1
公开(公告)日：2023-09-12
申请号：US17334546
申请日：2021-05-28
Applicant: Space Exploration Technologies Corp.
Inventor： Chen Chen , Darshan Purohit , Yashodhan Dandekar , Pavel Chikulaev , David Sacks , Peter J. Worters , Phillip E. Barber
CPC classification number: H04B7/18513 , H04W72/21 , H04W74/004 , H04W74/0833 , H04L1/0003 , H04L5/0007
Abstract: In an embodiment, a user terminal includes a connection manager component configured to generate an initial network entry request; an antenna assembly communicatively coupled to the connection manager and configured, in response to the initial network entry request, to find a satellite based on a search of a sky, wherein the satellite comprises a satellite assigned to downlink to a geographic cell associated with the user terminal; and a media access control (MAC) layer component communicatively coupled to the connection manager, the 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, wherein the particular portion is selected by the MAC layer component from among a plurality of portions of the uplink radio frame.
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公开(公告)号：US20250125905A1
公开(公告)日：2025-04-17
申请号：US19000441
申请日：2024-12-23
Applicant: Space Exploration Technologies Corp.
Inventor： Jeffrey A. Gardner , Yashodhan Dandekar , Ramakrishna Akella , Khasim Shaheed Shaik Mahammad
Abstract: Systems, methods, and techniques are provided for a radio link control (RLC) sublayer. An example satellite or user terminal can include a divisional of layer 2 of the OSI protocol layer structure. An example method includes providing a RLC sublayer on top of a MAC sublayer and adaptively switching, via the RLC sublayer and based on external data, between an unacknowledged mode and an acknowledged mode for the electronic communications. If the RLC sublayer is operating in the unacknowledged mode, the RLC sublayer provides one or more of (1) fragmentation and reassembly of service data units; (2) a use of RLC headers; and/or (3) no delivery guarantees. If the RLC sublayer is operating in the acknowledged mode, the RLC sublayer provides reliability in a sequence delivery service and one or more of (1) fragmentation and reassembly of service data units; and/or (2) the use of RLC headers.
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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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