Abstract: Various arrangements are presented for optimizing data transmission between a satellite and a user equipment. A satellite gateway system may receive a message from the user equipment indicative of a current location of the user equipment. Data may be retrieved from the Internet to be transmitted to the user equipment via the satellite. The satellite gateway system may transmit a downlink message to the satellite that comprises the retrieved data and beam steering data. The beam steering data may instruct the satellite to target a downlink spot beam on the current location of the user equipment based on the message received from the user equipment. The retrieved data may be transmitted to the user equipment via the targeted downlink spot beam.

Abstract: Methods and apparatus for increasing spectral efficiency in non-orthogonal multiple access (NOMA) communication, that implement receiving a signal stream from a user, splitting the signal stream into a plurality of sub-streams, applying a forward error coding (FEC) to each one of the sub-streams, and outputting a corresponding plurality of FEC encoded sub-streams. This can include modulating a corresponding carrier with each of the FEC encoded sub-streams, and combining and transmitting the corresponding plurality of modulated carrier signals. The modulated carrier signals can each carry a respective one of the FEC encoded sub-streams.

Abstract: Systems and methods are provided for channelizing. A first stage can provide a WOLA filter bank that can apply a single multiplier resource to perform window weighting for multiple WOLA filter banks. The first stage can remove mixer-based post FFT adjustment and provide equal functionality with a particular modification of tuning mixers at inputs of second stage FIR paths. The first stage can include a variable decimation, using a particular implementation of variable sample block size.

Abstract: A satellite user terminal gateway which performs transmission control protocol acceleration to enhance communication speed between a satellite user terminal and a satellite communication network. The satellite user terminal gateway includes a transceiver configured to communicate with a satellite communication network to receive data packets from the satellite communication network, and a controller configured to control the transceiver. The satellite user terminal gateway further includes a processor configured to identify transmission control protocol data packets among the received data packets to mirror the transmission control protocol data packets to the controller while routing the received data packets through the satellite user terminal gateway.

Abstract: A method and system for providing GTP acceleration for secure cellular backhaul over satellite (CBoS). A satellite terminal receives request from a first entity to establish a security association with a second entity, and establishes a first secure tunnel to a gateway. A second secure tunnel is then established between the gateway and the second entity based on a certificate belonging to the first entity. A third secure tunnel is established between the satellite terminal and the first entity based on a certificate belonging to the second entity. The contents of encrypted traffic between the first entity and the second entity are examined so that GTP acceleration may be applied to eligible traffic transmitted over the first secure tunnel.

Abstract: A system includes a terminal. The terminal includes a terrestrial communication interface, a satellite communication interface and a computer. The terrestrial and satellite communication interfaces are configured to communicate traffic data. The computer is communicatively linked to the terrestrial and satellite communication interfaces. The computer executes instructions comprising, to determine that the traffic data, communicated via the terrestrial communication interface, exceeds a threshold, and based on the determination, to route at least a portion of traffic data via the satellite communication interface in accordance with a predetermined traffic data load-balancing scheme.

Abstract: A satellite modem, a GPS device, and a method are provided. The satellite modem requests current location information from a GPS device and waits no more than a preconfigured amount of time to receive the current location information. When the satellite modem receives the current location information, the satellite modem determines whether the current location information indicates a location in which the satellite modem is authorized to operate. When the satellite modem determines that the current location information indicates a location in which the satellite modem is not authorized to operate, the satellite modem performs at least one action from a group of actions including preventing the satellite modem from operating normally, permitting the satellite modem to operate with a reduced functionality, and transmitting a message to a network management center indicating that the satellite modem is not located at an authorized location.

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for training and using machine learning clustering models to determine conditions a satellite communication system. In some implementations, feature vectors for a time period are obtained. Each feature vector includes feature values that represent properties of a satellite communication system at a respective time during the time period. Each feature vector is provided as input to a machine learning model that assigns the feature vector to a based on the properties of the satellite communication system represented by the feature vector. Each cluster corresponds to a respective potential operating condition of the satellite communication system.

Abstract: A shared bandwidth network system to communicate network traffic between terminals and an external network is disclosed. The system includes: a point of presence (POP) for the external network; Radio Frequency Gateways (RFGWs) wherein each RFGW of the RFGWs provides one or more Radio Frequency (RF) paths, and each of the RF paths links a respective RFGW of the RFGWs with one or more terminals of the terminals; an RF path state manager to manage a RF path state for each of the RF paths; a Satellite Network Core (SNC); a Software Defined Network (SDN) controller to maintain a topology based on the RF path states, wherein the topology includes the POP, the RFGWs and the SNC; and a network layer to route network traffic between the POP, the RFGWs and the SNC based on the topology.

Abstract: A method for controlling congestion of traffic, by one of one or more User Terminals (UTs), traversing an intermediate node, the method comprising: associating one or more traffic flows of a priority to one of the one or more UTs; detecting a traffic congestion for the priority; performing Random Early Detection (RED) congestion control for the priority to relieve the traffic congestion; selecting, for the priority, a User Terminal (UT) with a perceived delay greater than a high threshold; and controlling, by priority, the traffic flows associated with the selected UT.

Abstract: A system and method for providing communications with a Low Earth Orbit (LEO) satellite constellation using a non-omnidirectional antenna is disclosed. A system and method for determining blockages around a non-omnidirectional antenna for use with a Low Earth Orbit (LEO) constellation is disclosed. The method including: receiving System Information (SI) including ephemeris data for satellites in the LEO constellation; receiving a segment division that divides a ground about the antenna into segments; and determining a segment blocking information for the antenna.

Abstract: A computer comprises a processor programmed to identify a plurality of sets of channels. Each set of channels includes first, second and third channels. The first and second channels in each set include uplinks respectively in first and second neighbor beams and have a first bandwidth overlap. The first and third channels in each set share a target and a third downlink included in the third channel has a second bandwidth overlap with a first downlink included in the first channel. the second bandwidth overlap includes a bandwidth corresponding to at least a portion the first bandwidth overlap, such that a signal spectrum in the first bandwidth overlap is included in the second bandwidth overlap. The computer is further programmed to optimize a bandwidth reduction across the plurality of sets of channels.

Abstract: A method for balancing inroute traffic load that contains both guaranteed QoS and best effort traffic. Hierarchical grouping levels are defined with the lowest level corresponding to inroutes within the system. Certain levels have common symbol rates, modulation rates, or both. When a new terminal requires admission, it is assigned to entries in the different hierarchical levels so that the inroute traffic load across all levels are balanced. Terminals are admitted to inroutes based, in part, on their channel quality indicator. Inroute traffic load can periodically rebalance based on elapsed time or terminal redistribution.

Abstract: Techniques for data transmission including receiving, at a geostationary earth orbiting satellite, forward-direction user data via a forward optical link; transmitting, by the geostationary earth orbiting satellite via multiple radio frequency (RF) spot beams, the forward-direction user data received via the forward optical link; receiving, at a stratospheric high-altitude communication device, forward-direction user data via multiple concurrent forward RF feeder links; transmitting, by the stratospheric high-altitude communication device via the forward optical link, the forward-direction user data received via the forward RF feeder links; transmitting, by each of multiple ground-based feeder RF terminals at a same RF feeder site, a respective one of the forward RF feeder links. At least 95% of forward feeder data throughput for all of the forward RF service link transmissions by the satellite is carried via the forward optical link and the forward RF feeder links.

Abstract: A system and method for improving forward error correction efficiency in a communication network. The system and method employ a controller configured to evaluate a plurality of frames to identify a first type of the plurality of frames having a first frame processing characteristic pertaining to a first type of frame iteration processing performed by a terminal of the communication network and a second type of the plurality of frames having a second frame processing characteristic pertaining to a second type of frame iteration processing performed by the terminal. The controller is further configured to arrange a plurality of the first type of frames and at least one of the plurality of the second type of frames in an alternating order within a transmission window for transmission to the terminal.

Abstract: Techniques including controlling coupling and uncoupling of RF ports included in an RF switch matrix including first-side RF ports and second-side RF ports, where each of the first-side RF ports is configured to be selectively coupled to at least one of two or more of the second-side RF ports, identifying one or more of the second-side RF ports as active ports including an active port, causing the RF switch matrix to couple the active port to a signal port included in the first-side RF ports, obtaining at least one of a bit error rate and a signal to noise ratio for a demodulation of an RF stream received via the active port, and causing, in response to at least one of the bit error rate or the signal to noise ratio, the RF switch matrix to couple the signal port to a spare port included in the second-side RF ports.

Abstract: A network node includes a processor programmed to parse at least a portion of an input block having a plurality of segments, determine whether at least one of the plurality of segments matches a segment stored in a history buffer, and predict a compressibility of the input block based at least in part on whether at least one of the plurality of segments matches a segment stored in the history buffer.

Abstract: A digital phase shifter is described where each bit of the phase shifter has a circuit block including one PIN diode in parallel with one transmission line. The phase shifter requires only one PIN diode and one transmission line per bit circuit block. Each PIN diode behaves like a simple switch for phase shifting. When the PIN diode is forward biased (“on” state), current flows through the PIN diode and the RF signal is not phase shifted. When the pin diode is not forward biased (“off” state), current flows through the transmission line parallel to the PIN diode and the RF signal is phase shifted by the transmission line. The digital phase shifter may have n circuit blocks in series, and adjacent PIN diodes may share a current when both are on. The phase shifter may be implemented in a phased array or reflect array antenna including multiple phase shifters.

Abstract: A packet is received from a first link, and includes identification of a sender and a destination. An acknowledgement of receiving the packet is transmitted toward the sender, and the packet is forwarded, over a second link, toward the destination. A copy of the packet is stored in a queue. Upon detecting that the destination failed to receive the packet forwarded over the second link, the copy of the packet is retrieved from the queue and re-transmitted over the second link to the destination.

Abstract: Dynamic history multistream long range compression (DHC) techniques are described for efficiently compressing multiple, prioritized data streams received over a channel. A history buffer is associated with each received stream and a DHC compressor dynamically allocates fixed sized history sections to and from each history buffer. In implementations, the DHC compressor makes stream history size adjustments prior to compressing a block of data and sends information identifying the change in history size to a DHC decompressor. The DHC decompressor sends signaling information to the DHC compressor that is used to ensure that the DHC decompressor can operate with a fixed amount of total history memory.