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

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

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.

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

IPC: H04W72/12 ,  H04W72/14 ,  H04L1/00

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.

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

IPC: H04B7/185 ,  H04W72/21 ,  H04W74/00 ,  H04W74/0833 ,  H04L1/00 ,  H04L5/00

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.