Class / Patent application number | Description | Number of patent applications / Date published |
370321000 | Time division (TDMA) | 43 |
20090016260 | MF-TDMA FREQUENCY HOPPING - Systems, methods, and devices are described for scheduling and mapping upstream communications in a satellite communications system. The disclosure includes various channelization and frequency hopping techniques. A gateway is described to perform novel allocation of time slots on upstream frequency channels to allow frequency hopping. A subscriber terminal may perform frequency hopping according to the allocation, and the range may be limited to the transition range of a digitally controlled oscillator unit at the subscriber terminal. A gateway is described to allocate time slots on different upstream frequency channels in a prioritized manner. Subscriber terminals may receive the allocation, and then control the assignment of their upstream traffic to the time slots. | 01-15-2009 |
20090022088 | Systems and methods for mobile satellite communications - Systems and methods of satellite communications for moving terminals, including but not limited to on-the-move and mobile terminals (e.g., on-the-pause terminals), are implemented in certain embodiments using smaller antennas (e.g., aperture area with diameter less than 50 cm), open standard waveforms to secure availability from several suppliers, payment for service only when using the terminal, interference avoidance to adjacent satellites, and low cost. Low cost is achieved in part by operating at frequency bands that are currently operated by terrestrial microwave links so that existing low cost microwave components are utilized. The system also includes an interference elimination system that continuously monitors for interference to adjacent satellites from a user terminal's uplink signal. If interference is detected, the interference elimination system remedies the interference by performing one or more of the following: shutting down the interfering terminal(s), changing transmission parameters, changing the beam coverage on ground, changing the frequency of the affected traffic, or moving the satellite to a new orbital position. The interference elimination system may also transit the interference information to a control center. | 01-22-2009 |
20090059839 | Broadband Satellite System and Method - Implementations of broadband satellite systems may comprise systems implementing embodiments of one, two or all of the aspects of distributed leadership, distributed bandwidth allocation and distributed timing. In systems implementing distributed leadership aspects, the control and administration of the network can be effectively performed by any site. In systems implementing distributed bandwidth allocation aspects, all remote sites may act in concert by running the same algorithm on the information they have received, arriving at a harmonious conclusion. In systems implementing distributed timing aspects, time division multiple access (“TMDA”) bursts within timeslots may not require a central timing reference, a distributed high stability timing reference or a timing leader. | 03-05-2009 |
20090097435 | Method and apparatus for controlling transmissions in communication systems - In a bandwidth allocation protocol for a mobile communications network, mobile terminals indicate the total quantity of data awaiting transmission, the maximum delay time of the most urgent portion of the data, and the maximum delay time of the least urgent portion. If a collision occurs between transmission by two mobiles, the mobiles wait for an interval controlled by the network before attempting another contention-based access transmission. The network periodically varies the contention-based access capacity available according to the observed usage level and/or collision rate in the previously allocated contention-based access capacity. The network analyses the forward traffic to individual mobiles and predicts likely return bandwidth requirements. The network stores associations between forward and return frequency channels, so that when a mobile receiving a forward frequency channel request return capacity, the network preferentially assigns return bandwidth to the mobile in one or more of the associated return channels. | 04-16-2009 |
20090147728 | Wireless Cooperative Relay Network Transmitting Data using Imperfect CSI - A method, system and network transmit data from a base station, via relay stations, to user stations. Imperfect channel state information (CSI) for downlink channels from the base station and the relay stations to the user stations is acquired. For each candidate transmission strategy of a set of candidate transmission strategies, a corresponding beamforming matrix is determined according the imperfect CSI. For each beamforming matrix, a bound on an expected target benefit function is determined, and a particular one of the bounds is selected. The data are then transmitted from the base station, via the relay stations, to the user stations according to the beamforming matrix associated and the candidate strategy associated with the selected bound. | 06-11-2009 |
20090213782 | RANDOM ACCESS SLOT SELECTION IN A COMMUNICATIONS SYSTEM - A communications system ( | 08-27-2009 |
20090279475 | DYNAMIC LINK ASSIGNMENT IN A COMMUNICATION SYSTEM - An architecture for the dynamic assignment of links in a multi-user communication system. A plurality of information channels are provided in a forward communication link of the communication system for carrying channel information of the plurality of information channels from a transmitter to a plurality of corresponding receiving devices. The channel information in corresponding select ones of the plurality of information channels is varied dynamically in response to link conditions of the associated receiving devices to more efficiently utilize the channel bandwidth. | 11-12-2009 |
20090290535 | MULTI-USER DETECTION IN SATELLITE RETURN LINK - Use of multi-user detection (MUD) with a frequency-multiplexed satellite return link (scheduling algorithms, etc) is described. The satellite return link may utilize multi-frequency time division multiple access (MF-TDMA). The satellite return link may include a plurality of return sub-channels, wherein one or more of the return sub-channels may operate in a contention mode during some time periods and a non-contention mode at different time periods. | 11-26-2009 |
20090290536 | High Data Rate Multiplexing Satellite Stream to Low Data Rate Subscriber Terminals - A satellite modem for broadband communication. The satellite modem receives a satellite signal on a single carrier from a satellite. The satellite signal is divided by time division multiplexing into physical sub-channels encapsulating logical downstreams. The satellite modem includes a filter which removes a subset of the physical sub-channels intended for the subscriber terminal. The satellite modem includes a demodulator, a decoder, and a medium access channel. The MAC processes the logical downstreams. | 11-26-2009 |
20090296629 | RETURN LINK POWER CONTROL - Satellite communication methods and systems are disclosed. Various embodiments employ dummy bursts to monitor the communication channel between a user terminal and a hub. In some embodiments, dynamic link adaptation can also be employed to optimize channel performance. In some embodiments, the link margin can be estimated based on the signal quality of a traffic or dummy burst that is received at the hub and compared with a threshold value. If the link margin is less than a first/low threshold then the hub can instruct the terminal to change any of various communication parameters according to a predetermined algorithm to mitigate channel fading. If the link margin is greater than a second/high threshold then the hub can instruct the terminal to change any of various communication parameters according to a predetermined algorithm to reduce overcompensation for channel fading. | 12-03-2009 |
20100034136 | Transparent Mesh Overlay in Hub-Spoke Satellite Networks - In a satellite-based communication network comprised of a central hub and plurality of remote terminals configured to transmit data to and receive data from the central hub in accordance with EN 301 790 (DVB-RCS), and where one or more of these remote terminals may be configured to include an additional receiver module configured to receive MF-TDMA transmission of other remote terminals, a mesh receiver and methods for coupling the mesh receiver with the host remote terminal. In addition, described herein are methods for synchronizing the mesh receiver on the network's timing and frequency and for utilizing the available link power for achieving efficient connectivity. | 02-11-2010 |
20100074167 | Downstream Time Domain Based Adaptive Modulation for DOCSIS Based Applications - In a DOCSIS based satellite gateway data is transmitted over a single downstream channel, at different throughput rates. Data destined for each subscriber/receiver is assigned a throughput rate depending upon the downstream signal quality of that subscriber/receiver. To accomplish this, the downstream DOCSIS MAC data is parsed to extract DOCSIS packets. The DOCSIS packets are then loaded into packet queues based on an identifier within such packets such as the MAC destination address or SID. Each of the queues represents a bandwidth efficiency or throughput rate that can be currently tolerated by specific subscribers based on the current signal quality being experienced at the subscriber location. A PHY-MAP describing the downstream data structure to be transmitted and inserted into the downstream data. Data is extracted from the packet queues in queue blocks as defined by the PHY-MAP. The queue blocks are modulated with transmission parameters appropriate for each queue block and transmitted to the DOCSIS based satellite modems. The satellite modems extract the PHY-MAP from the downstream data and use the information contained in it to demodulate and decode the queue for which they have sufficient downstream signal quality. Satellite modems measure and transmit downstream signal quality to the satellite gateway to be used to assigned traffic to the appropriate queues. | 03-25-2010 |
20100118769 | TERMINAL SLOT ASSIGNMENT FOR A SATELLITE COMMUNICATIONS SYSTEM - Novel satellite communications systems, methods, and related devices are described. In some embodiments, a satellite communications system is configured to dynamically allocate bandwidth to terminals. Such a system may be made up of a satellite in communication with terminals (e.g., user terminals or gateways). The satellite or a Network Control Center (NCC) may receive and compile bandwidth request data from the terminals. In each of a series of one or more epochs, and according to the bandwidth requests, the satellite and/or NCC may allocate carrier group resources to particular traffic classes. The assignment of allocated resources to particular terminals is also described. | 05-13-2010 |
20100189028 | METHOD AND SYSTEM FOR BROADCASTING DIGITAL SERVICES - Method and system for broadcasting digital services comprising a plurality of receiver sets located in several regions and at least one broadcasting facility which rebroadcasts several services with region-specific contents in a single transport stream (TS) consisting of time multiplexed digital packets, said TS reaching all the receiving sets in all the regions in the area covered by the signals originating from said broadcasting facility, the region-specific content being extracted from said TS by the receiving sets of each targeted region by filtering the packets containing region-specific and service-specific packet identifiers—PID's—which are periodically changed as a function of time in accordance with information contained in private tables which are also included in said TS. | 07-29-2010 |
20100195563 | METHOD AND SYSTEM OF PROVIDING EFFICIENT PACKETIZED VOICE COMMUNCATIONS AND DATA BEARERS IN MOBILE SATELLITE SYSTEMS - A broadband satellite communications system comprises forward error correction (FEC) encoder/decoder, interleaver/deinterleaver, puncturing/de-puncturing, scrambler/descrambler, bit to symbol mapping/de-mapping devices, modulator/demodulator, transmit and receive filter; operating in a time-division multiple access (TDMA) system where information is sent in a burst-by-burst fashion during the assigned time slot; supporting diverse traffic types such as voice over internet protocol (VOIP), control messages (DACCH) and keep alive burst (KAB) during silence period and multiple data rates. | 08-05-2010 |
20100284323 | HIGHLY INTEGRATED VERY SMALL APERTURE TERMINAL (VSAT) APPARATUS AND METHOD - A method, and a VSAT capable of being configured for such a method, of configuring a VSAT, the steps of which are setting, while an outdoor unit of the VSAT is at a configuration location, a maximum value of the adjustable gain of the up-converting device and transmitting, from an operating location that is separate from the configuration location, transmission signals to the satellite at the transmission frequency and with a gain value of at most the maximum value of the adjustable gain set at the configuration location. | 11-11-2010 |
20100284324 | Multiple Return Link - A system and method for improving efficiency of satellite communications is described. In one embodiment, multiple return links are associated with a single forward link to reduce communications costs. | 11-11-2010 |
20100322150 | CYCLICAL OBSTRUCTION COMMUNICATION SYSTEM - Techniques for enabling broadband data rates at mobile terminals in a beyond-line-of-sight communication system are disclosed. Forward link time-diversity transmission methods and a time-diversity transmitter based upon blockage characteristics are provided. The transmitter optionally supports selective time-diversity and can operate at Ku-band or higher frequencies. A forward link time-diversity receiver and methods for receiving a forward link time-diversity signal are also disclosed. The forward link time-diversity receiver optionally provides low-jitter or low-delay characteristics. A return link transmitter and return link transmit methods which avoid blockages are also disclosed. The return link transmitter can include a signal presence detector and blockage prediction filter. | 12-23-2010 |
20110176479 | SYSTEM AND METHOD OF DOPPLER AND LOCAL OSCILLATOR COMPENSATION IN A TDMA SYSTEM - System and method for determining an optimal transmission center frequency for a traffic station ( | 07-21-2011 |
20110268017 | FLEXIBLE CAPACITY SATELLITE COMMUNICATIONS SYSTEM WITH DYNAMIC DISTRIBUTION AND COVERAGE AREAS - Systems and methods for supporting more flexible coverage areas and spatial capacity assignments using satellite communications systems are disclosed. Antenna elements are arranged in one or more phased arrays. The phased arrays may be used to receive uplink communications, transmit downlink communications, or both receive uplink communications and transmit downlink communications. Beam forming networks (BFN's) associated with the one or more phased arrays may be dynamic, allowing for movement of the locations of the receive beams, the transmit beams, or both the receive beams and transmit beams. The beams may then “hop” from location to location according to a predefined or dynamic hopping pattern. In some embodiments, the hopping patterns may be time-varying and may be changed or updated on-the-fly. | 11-03-2011 |
20130028175 | METHOD AND SYSTEM OF PROVIDING EFFICIENT PACKETIZED VOICE COMMUNCATIONS AND DATA BEARERS IN MOBILE SATELLITE SYSTEMS - A broadband satellite communications system comprises forward error correction (FEC) encoder/decoder, interleaver/deinterleaver, puncturing/de-puncturing, scrambler/descrambler, bit to symbol mapping/de-mapping devices, modulator/demodulator, transmit and receive filter; operating in a time-division multiple access (TDMA) system where information is sent in a burst-by-burst fashion during the assigned time slot; supporting diverse traffic types such as voice over internet protocol (VOIP), control messages (DACCH) and keep alive burst (KAB) during silence period and multiple data rates. | 01-31-2013 |
20130039264 | DISTRIBUTED MANAGEMENT OF LEO SATELLITE NETWORKS WITH MANAGEMENT AGILITY AND NETWORK EFFICIENCY - In a distributed management scheme for LEO satellite networks interactions between a satellite and the designated fixed center occur according to a time schedule and only when the designated center is in the coverage area of the payload. For exception/alarm reporting and real-time configuration updates the interaction varies with time. Interactions of this type occur between a satellite and the management center that is “nearest” to the payload or satellite at the time instant at which the network event occurs or configuration upload is needed. The nearest management center for a payload is the center that can be reached from the payload with fewest number of crosslink hops. A central network operation center determines, prior to payload launch, the association between satellites and management centers for routine information exchange, and the nearest management center for the payload for different snapshots of time. | 02-14-2013 |
20130128805 | HIGHLY INTEGRATED VERY SMALL APERTURE TERMINAL (VSAT) APPARATUS AND METHOD - A method, and a VSAT capable of being configured for such a method, of configuring a VSAT, the steps of which are setting, while an outdoor unit of the VSAT is at a configuration location, a maximum value of the adjustable gain of the up-converting device and transmitting, from an operating location that is separate from the configuration location, transmission signals to the satellite at the transmission frequency and with a gain value of at most the maximum value of the adjustable gain set at the configuration location. | 05-23-2013 |
20130286934 | SATELLITE COMMUNICATION SYSTEM EMPLOYING A COMBINATION OF TIME DIVISION MULTIPLEXING AND NON-ORTHOGONAL PSEUDORANDOM NOISE CODES AND TIME SLOTS - An improved satellite communication system is provided comprising at least one satellite wherein each satellite provides multiple beams, a plurality of UTs, and at least one gateway connected to a PSTN and communicating with said at least one UT or with a constellation, wherein each of the UTs within a given frequency band is distinguished from another of the UTs employing a combination of TDM and NOPN codes and time slots. | 10-31-2013 |
20140105100 | SATELLITE COMMUNICATION SYSTEM, LEO SATELLITE RELAYING COMMUNICATIONS BETWEEN A GEO SATELLITE AND TERRESTRIAL STATIONS, THE UPLINKS AND DOWNLINKS USING THE SAME FREQUENCY BAND AND TIME-DIVISION MULTIPLEXING - A payload for a repeater satellite of a communication system. The repeater satellite being placed into drift orbit above the surface of a celestial body. The payload being configured to repeat data received from a stationary satellite above the surface of the celestial body towards a terminal substantially at the surface of the celestial body, and to repeat data received from the terminal towards the stationary satellite. The payload is further configured to use a single frequency band for repeating data towards the stationary satellite, referred to as uplink transmission, and for repeating data towards the terminal, referred to as downlink transmission, as well as to time-division | 04-17-2014 |
20150117304 | DATA PROCESSING METHOD AND APPARATUS BASED ON AUTOMATIC IDENTIFICATION SYSTEM - The present invention discloses a data processing method and apparatus based on an automatic identification system, relates to the field of communications network technologies The method comprises: a virtual station container receives data request sent by a poller, and successively checks whether each virtual station in the virtual station container has to-be-sent data in a current timeslot, where the virtual station includes a virtual timeslot allocation logic TAL device; and when a first virtual station has to-be-sent data in the current timeslot, the virtual station container reads the data in the first virtual station, and sends the read data to a transmitter. The method provided by the embodiments of the present invention is applicable to data exchange between an automatic identification system and an external network. | 04-30-2015 |
20150373706 | Satellite Communication System Employing a Combination of Time Division Multiplexing and Non-Orthogonal Pseudorandom Noise Codes and Time Slots - An improved satellite communication system is provided comprising at least one satellite wherein each satellite provides multiple beams, a plurality of UTs, and at least one gateway connected to a PSTN and communicating with said at least one UT or with a constellation, wherein each of the UTs within a given frequency band is distinguished from another of the UTs employing a combination of TDM and NOPN codes and time slots. | 12-24-2015 |
370322000 | Channel reservation scheme | 3 |
20100284325 | Elastic Access Scheme for Two-way Satellite Communication Systems - In a satellite communication system, comprising a hub, a satellite and plurality of remote terminals (e.g., VSATs), a method for allocating timeslots over a return channel to VSATs in real time, without a reference to a predefined time-frequency map, for at least the purpose of optimizing return channel utilization. Also presented are a method for dividing a return channel to transmission channels in real time, a method for determining a most suitable timeslot type for a VSAT per allocation period and a tiling algorithm for mapping allocated capacity onto return channel bandwidth. | 11-11-2010 |
20130176937 | MULTIPLE ACCESS TRANSMISSION SCHEME FOR A WIRELESS SYSTEM - A wireless multiple access communication system ( | 07-11-2013 |
20160183126 | LOAD BALANCING OF COMMITTED INFORMATION RATE SERVICE SESSIONS ON TDMA INROUTE CHANNELS | 06-23-2016 |
370323000 | Including onboard switching | 1 |
20090161598 | PARTIAL MESH COMMUNICATION IN HUB BASED SYSTEM - A partial mesh link channel is established within a satellite communication system by allocating return link channel resources to the partial mesh link channel. | 06-25-2009 |
370324000 | Synchronization | 12 |
20090129312 | System and Method for Timing Synchronization - The present disclosure relates generally to systems and methods for timing synchronization. Uplink synchronization is a necessary component of a UE operating in a mobile, wireless network. Reliable uplink synchronization generally requires regular uplink transmission containing reference signals. A method is provided that defines a burst period for sending the reference signals, determines an interval between the reference signals, and sends a timing instruction message that includes the burst period and the determined interval. A second method is provided that receives the timing instruction message and sends the reference signals in accordance with the timing instruction. | 05-21-2009 |
20100034137 | BEACON SIGNAL GENERATING APPARATUS IN SATELLITE COMMUNICATION SYSTEM AND PHASE SYNCHRONIZING APPARATUS USING THE SAME - Provided are a beacon signal generating apparatus and a phase synchronizing apparatus using the same for establishing a phase synchronization while tracking a phase variation of a Timing Source Oscillator (TSO) of a satellite using a simpler scheme at an earth station, in making a phase synchronization between a clock signal of an On board Switch (OBS) embedded in the satellite and that of the earth station in a Satellite Switched Time Division Multiple Access (SS-TDMA) satellite communication system. The inventive beacon signal generating apparatus embedded in a satellite comprises a frequency oscillator for creating a TSO frequency, a beacon signal generator for multiplying the TSO frequency to be matched with a beacon signal frequency to generate a beacon signal synchronized with the TSO frequency, and a transmitter for transmitting the beacon signal to each of earth stations to recovery a frequency synchronized with the TSO frequency. | 02-11-2010 |
20120207085 | TRANSMISSION FOR A WIRELESS NETWORK AND CORRESPONDING RECEPTION METHOD - The invention relates to an emission method for a wireless network comprising a plurality of stations emitting at the same frequency. In order to optimize the use of radio channels, the method comprises the following steps implemented by at least one relay station RS of the plurality of stations:
| 08-16-2012 |
20130077563 | DATA TRANSMISSION AND RECEPTION METHOD AND APPARATUS ROBUST AGAINST PHASE NOISE FOR HIGH EFFICIENCY SATELLITE TRANSMISSION - A data transmission and reception apparatus is used for a high efficiency satellite transmission. The apparatus includes an initial phase calculation unit to calculate initial phase information using a preamble and a postamble of a data packet applied thereto, a symbol transition calculation unit to perform forward and backward metric operations using the initial phase information calculated by the initial phase calculation unit and a pilot symbol in the data packet to calculate a symbol transition of the data packet, and a phase error estimation unit to calculating a phase error using the pilot symbol in a spot where the pilot symbol is positioned, the calculated phase error being provided to the symbol transition calculation unit. | 03-28-2013 |
20130136055 | SATELLITE COMMUNICATION NETWORK - Methods and apparatus are disclosed to enable a fixed or a mobile ground based slave stations (VSAT: Very Small Aperture Terminal) in a communication network to receive TDM transmissions from and transmit TDMA burst transmissions to one or more ground-based gateway stations in a networking system that employs one or more geosynchronous satellites. Each gateway station transmits on one or more forward TDM channels to the slave stations; however, one primary gateway acts as the master station at any given time which transmits the network control messages to the slave stations (VSATs) that control their TDMA transmission behavior on the network. | 05-30-2013 |
20130201906 | PRECISE TIME SYNCHRONIZATION OF NETWORK SUBSCRIBERS - Simple and robust precise time synchronization of network subscribers is provided by a system having at least one head station with a satellite antenna and a receiving station receiving a satellite signal containing time information. Also included is a station clock having a network connection for the synchronization of the network subscribers using a real time network protocol. An electronic system, arranged in the head station or the station clock, receives the time information from the satellite signal. A bidirectional communication infrastructure connects the head station and the station clock. | 08-08-2013 |
20130315137 | FRAME TIMING SYNCHRONIZATION IN A GEOSTATIONARY SATELLITE SYSTEM - Aspects of the invention provide a system and method to allow inroute frame timing synchronization without the aid of hub signal loopback or satellite ephemeris data. Furthermore, it allows tracking and compensating of the satellite motion to allow multiple remotes to use TDMA on the inroute frequencies, while minimizing the aperture. Two main techniques proposed are CLT and polling based approaches, which are used in combination for an optimum solution. In CLT based approach, hub transmits remote specific timing correction feedback messages on the outroute on as needed basis. In polling based approach, the remotes derive their timing based on a per-beam average delay estimate broadcast by the hub and a measured local delay specific to each outroute stream from a remote. An aspect of the invention uses triangulation method to determine satellite position. Furthermore, an aspect of the invention uses hub burst arrival method instead of polling approach. | 11-28-2013 |
20140016543 | SYNCHRONIZATION DEVICE AND SYNCHRONIZATION METHOD - A synchronization device has a normal-signal generator, a reference-signal generator, and a phase difference detector. The normal-signal generator generates a normal signal whose timing is synchronized with a time signal from a satellite. The reference-signal generator generates a reference signal whose timing is synchronized with a received signal. The phase difference detector detects the phase difference between the reference signal and the normal signal. The normal-signal generator then controls the normal signal on the basis of the phase difference when the time signal cannot be obtained. | 01-16-2014 |
20150139071 | Method, Apparatus, and System for Synchronization - Embodiments of the present invention provide a method, an apparatus, and a system for synchronization. The method includes the following steps executed by a first device: sending clock information acquiring request to a second device through an Antenna Interface Standards Group AISG interface; receiving a clock signal from the second device through the AISG interface; and performing synchronization according to clock information of the clock signal. The first device is a base station and the second device is an antenna line device, or the first device is an antenna line device and the second device is a base station. | 05-21-2015 |
20150293204 | METHOD AND DEVICE FOR DETERMINING THE PROPAGATION TIME OF A SURFACE ACOUSTIC WAVE FILTER - The invention relates to a receiver of a system for positioning by satellite, including: a channel filter (SAW) in which a signal transmitted by satellite and received by the receiver is propagated along a direct path and indirect paths in an odd order; upstream from the channel filter, a tracking loop being controlled by means of a control correlator (C | 10-15-2015 |
20150295702 | SYNCHRONIZATION APPARATUS, SYNCHRONIZATION SYSTEM, RADIO COMMUNICATION APPARATUS AND SYNCHRONIZATION METHOD - A synchronization apparatus capable of reducing the effect of the fluctuations in synchronization signals that are caused when the synchronization signals are received through a network are provided. A synchronization apparatus ( | 10-15-2015 |
20180027511 | Calculating Timing Offset in Wireless Communications | 01-25-2018 |