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

IPC: H04B7/185 ,  H04W74/08 ,  H04W74/00 ,  H04W72/21

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.

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

IPC: H04W36/06 ,  H04W36/08 ,  H04B7/06 ,  H04B7/185

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.

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

IPC: H04B7/185 ,  H04W74/08 ,  H04W74/00 ,  H04W72/21 ,  H04L5/00 ,  H04L1/00

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.

公开(公告)号：US20250062935A1

公开(公告)日：2025-02-20

申请号：US18815754

申请日：2024-08-26

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 ,  H04L27/00 ,  H04L27/26 ,  H04W72/044 ,  H04W72/0453

Abstract: A modem is configured to receive a transmitted waveform transmitted from a satellite (SAT) to a user terminal (UT). The modem includes: a receiver, on the UT, configured to receive the transmitted waveform from the SAT, the transmitted waveform comprising first resource blocks intended for the UT and second resource blocks intended for a second UT, a first set of components configured with the receiver on the UT to process the transmitted waveform with the first resource blocks and the second resource blocks, a multi-user demapper configured with the receiver to extract the first resource blocks from the transmitted waveform to yield a per-user signal, and a second set of components configured within the receiver to demodulate and decode the first resource blocks in the per-user signal.

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

IPC: H04B7/185 ,  H04W36/00 ,  H04W36/08 ,  H04W88/16

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.

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.