On-ramp Wireless, Inc.

Totum Labs, Inc.

Freescale Semiconductor,inc.

Other

Ingenu

On-ramp Wirless, Inc.

Apple Inc.

Theodore Jon Myers

Matthew Zacchariah Hughes

Robert W Boesel

Daniel Werner

Lewis Neal Cohen

Kenneth C Sinsuan

Patrick M Singler

Tien Q Nguyen

Frederick Wales Price

Michael Jason Huovila

Sourav Dey

Robert W Bosel

Jason Ronald Wilson

Kenneth Canullas Sinsuan

Shawn Louis Reuland

Robert Wright Boesel

Daniel Thomas Werner

An illustrated embodiment disclosed herein is a method for downlink scheduling. The method includes scheduling, by a satellite, one or more protocol data units (PDUs) in a slot, determining, by the satellite, whether available capacity of the slot is less than a predetermined threshold, responsive to determining that the available capacity of the slot is not less than the predetermined threshold, scheduling, by the satellite, a second one or more PDUs in the slot, and responsive to determining that the available capacity of the slot is less than that the predetermined threshold, transmitting, by the satellite, the slot to an endpoint. In some embodiments, the one or more PDUs are associated with a first spreading factor (SF). In some embodiments, the first SF is lower than a second SF. In some embodiments, the second one or more PDUs are associated with the second SF.

System and method for downlink scheduling that optimizes downlink (DL) capacity

An illustrated embodiment disclosed herein is a method including receiving, by a gateway, a first physical data unit (PDU) of a plurality of PDUs from an endpoint via a first satellite, receiving, by the gateway, a second PDU of the plurality of PDUs from the endpoint via a second satellite, and decoding, by the gateway, a payload from the first PDU and the second PDU.

System and method for forward error correcting across multiple satellites

An illustrated embodiment disclosed herein is a method including receiving, by an endpoint, a downlink (DL) PDU from of a plurality of sources, determining, by the endpoint and for each DL PDU, a frequency offset from a reference frequency, selecting, by the endpoint, one of the plurality of sources having a first frequency offset that satisfies an threshold, and sending, by the endpoint, an uplink (UL) PDU to the selected source.

System and method for selecting zero doppler transmission

An illustrated embodiment disclosed herein is a method including receiving, by an endpoint and from a satellite, a downlink (DL) frame including a reduced power portion of the DL frame, measuring, by the endpoint, a signal strength of the reduced power portion of the DL frame, selecting, by the endpoint, an uplink (UL) spreading factor (SF) and a UL transmit (Tx) backoff associated with a target UL Tx power at which to send a UL frame, measuring, by the endpoint, a first rise-over-thermal, sending, by the endpoint and to the satellite, the UL frame including at least one of the UL SF or the first rise-over-thermal, receiving, by the endpoint and from the satellite, a DL physical data unit (PDU) modulated by a DL SF selected by the satellite, and demodulating, by the endpoint, the DL PDU simultaneously at a plurality of SFs.

System and method for a power control scheme that optimizes downlink (DL) capacity

An illustrated embodiment disclosed herein is a method including maintaining, by a satellite, a plurality of physical data units (PDUs). Each PDU has a corresponding spreading factor (SF). The method includes selecting, by the satellite, a lowest SF, adding, by the satellite, all PDUs associated with the lowest SF to a slot, and determining, by the satellite and until the determination is affirmative, whether available capacity of the slot is less than a predetermined threshold. The method includes, responsive to determining that the available capacity of the slot is not less than the predetermined threshold, selecting, by the satellite, a greater SF and adding, by the satellite, one or more PDUs associated with the greater SF to the slot. The method includes responsive to determining that the available capacity of the slot is less than that the predetermined threshold, sending, by the satellite, the slot to an endpoint.

An illustrated embodiment disclosed herein is a method including receiving, by an endpoint, a plurality of swept syncs, each swept sync being on a different channel, measuring, by the endpoint, a received signal power for each of the plurality of swept syncs, determining, by the endpoint, a first swept sync based on the received signal power, interpolating, from the first swept sync, a first channel for sending an uplink (UL) physical data unit (PDU), sending, by the endpoint, the UL PDU on the first channel, and receiving, by the endpoint, a downlink (DL) PDU on a second channel, wherein the second channel is based on the first channel to leverage channel reciprocity.

System and method for determining a target for an uplink (UL) transmission

An illustrated embodiment disclosed herein is a method including determining, by an endpoint, a Doppler frequency offset and a first derivative of the Doppler frequency offset, calculating, by the endpoint, a second derivative of the Doppler frequency offset based on an orbital model, and calculating, by the endpoint, a first delta to the Doppler frequency offset and a second delta to the first derivative of the Doppler frequency offset.

System and method for doppler compensation using a second derivative

An illustrated embodiment disclosed herein is a method including correlating, by an endpoint, a first frame and a second frame with a plurality of hypotheses, detecting, by the endpoint, for each correlation of the first frame, a first metric and, for each correlation of the second frame, a second metric, identifying, by the endpoint, a first subset of hypotheses based on the first metric and a second subset of hypotheses based on the second metric, identifying, by the endpoint, pairs of hypotheses, each pair including a first hypothesis from the first subset and a second hypothesis from the second subset. The first hypothesis is same or within a predetermined distance of the second hypothesis. The method includes selecting, by the endpoint and from the pairs of hypotheses, a hypothesis based on the second metric and selecting, by the endpoint, a channel for transmission at which the hypothesis is selected.

System and method for detecting a satellite

An illustrative embodiment disclosed herein is a method including determining, by a location server, a satellite constellation, a location of a target endpoint, and a next available time of the target endpoint. The method further includes determining, by the location server, a plurality of candidate satellites based on the satellite constellation, the location of the target endpoint, and the next available time of the target endpoint. The method further includes instructing, by the location server, a ground station to broadcast a downlink signal to the plurality of candidate satellites.

System and method for selecting reliable satellite links

An illustrative embodiment disclosed herein is a satellite including a transceiver, a first antenna, a second antenna, and a switch to enable only the first antenna by electrically coupling the first antenna to the transceiver responsive to a satellite constellation having less than a threshold number of satellites and enable only the second antenna by electrically coupling the second antenna to the transceiver responsive to the satellite constellation having greater than the threshold number of satellites.

Re-configuring satellite antennas based on the number of satellites in a constellation

An illustrative embodiment disclosed herein is a method, by a satellite, including sending a downlink signal to a first endpoint and a second endpoint at a first time and receiving a first uplink signal from the first endpoint at a second time. The second time is based on a first delay value calculated by the first endpoint. The method further includes receiving a second uplink signal from the second endpoint at a third time. The third time is based on a second delay value calculated by the second endpoint. The method further includes calculating the first delay value and the second delay value based on one or more identifiers of the first endpoint and the second endpoint, respectively, and an algorithm and determining a first distance between the satellite and the first endpoint and a second distance between the satellite and the second endpoint.

Multiple access system and method for determining a distance to an endpoint

An illustrative embodiment disclosed herein is a method including estimating, by an endpoint, a first rate of change of a Doppler frequency offset during a downlink reception from a satellite associated with the Doppler frequency offset and applying, by the endpoint, a second rate of change of the Doppler frequency offset to an uplink transmission to the satellite. The second rate of change of the Doppler frequency offset compensates the first rate of change of the Doppler frequency offset.

System and method for compensating the effects of doppler

Methods, systems, and apparatuses, including computer programs encoded on computer-readable media, are configured to spread a first frame of data using a first spreading code to create a spread first frame and to spread a second frame of data using the first spreading code to create a spread second frame. A delay generator generates a first transmission delay and a second transmission delay. A transmitter starts to transmit the first spread frame on a first frame boundary delayed by the first transmission delay and starts to transmit the second spread frame on a second frame boundary delayed by the second transmission delay. A receiver starts to receive a third spread frame on a third frame boundary delayed by the first transmission delay and starts to receive a fourth spread frame on a fourth frame boundary delayed by the second transmission delay.

Synchronized access point transmissions with random timing

Methods, systems and instructions stored on computer-readable media for generating a first data stream and a second data stream. The first data stream is spread using a first gold code unique to a first tag. The second data stream is spread using a second gold code unique to a second tag. The spread first data stream and the spread second data stream are combined into a combined data stream. The combined data stream is transmitted to the first tag and the second tag.

Combined unique gold code transmissions

Methods, systems and instructions stored on computer-readable media for generating, at a first node, a plurality of data units. The plurality of data units are spread with a common pseudo-noise (PN) code that is used by a plurality of nodes, including the first node and a second node, that are in communication with an access point. A random timing offset is determined, and a first data unit is transmitted to the access point at a first time based upon a slot start time and the random timing offset. The first data unit is transmitted while at least a portion of a second signal is transmitted from the second node such that both the first data unit and the second signal are received by the access point. The second signal is transmitted at a second time based on the slot time and a second random timing offset.

Growing community of inventors

San Diego, CA, United States of America

Theodore Jon Myers