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US 12,464,567 B2Granted
Random access for broadband 4G and 5G over satellite
AssigneeLockheed Martin Corporation
InventorXiangdong Liu
Life of this patent
Estimating the term…
Abstract
Systems and methods for communication in 4G and 5G broadband satellite networks are provided. The disclosed methods include Global Navigation Satellite System (GNSS)-independent methods, and GNSS assisted methods that do not require transmission of satellite ephemeris information from a base station to user equipment.
Claims17
A method for communication in a broadband satellite network comprising a base station, a terminal device, and a satellite, the method comprising:
- receiving, at the terminal device from the base station via the satellite, a downlink frame;
- determining, at the terminal device, an arrival time of the downlink frame;
- determining, at the terminal device, a transmission time of the downlink frame using the arrival time of the downlink frame, and using a convention, previously established with the base station, relating system frame numbers (SFNs) to a Global Navigation Satellite System (GNSS) time epoch;
- determining a first timing advance based on the arrival time, the transmission time, and an error term corresponding to a terminal device GNSS receiver timing accuracy of the terminal device and a motion of the satellite;
- and
- advancing subsequent communications from the terminal device to the base station via the satellite by the first timing advance.
3 more elements
A base station for communication in a broadband satellite network, the base station comprising:
- one or more processing units configured to:
- provide, to a terminal device, a downlink frame;
- establish, with the terminal device, a convention relating system frame numbers (SFNs) to a Global Navigation Satellite System (GNSS) time epoch;
- receive, from the terminal device, a first timing advance, wherein the first timing advance is based on an arrival time and a transmission time of the downlink frame,
- wherein the transmission time is based on the convention;
- and
- receive, from the terminal device, subsequent communications based on the first timing advance.
4 more elements
Dependencies are inferred from the claim text.