Abstract: In one embodiment of the present disclosure, a satellite communication system includes a satellite constellation including a plurality of satellites in non-geosynchronous orbit (non-GEO), wherein at least some of the plurality of satellites travel in a first orbital path at a first inclination, and an end point terminal having an earth-based geographic location, the end point terminal having an antenna system defining a field of regard for communicating with the satellite constellation, wherein the field of regard is a limited field of regard, wherein the field of regard is tilted from a non-tilted position to a tilted position, and wherein the tilt angle of the tilted position is a function of the latitude of the geographic location.

Abstract: Aspects of the subject disclosure may include, for example, a machine-readable medium with executable instructions that facilitate performance of operations by a processor including receiving a registration for a trajectory of a satellite; estimating a zone of occupancy at a future time for the satellite; determining an interference of the satellite from the zone of occupancy at the future time; determining a deconfliction for minimizing or eliminating the interference; and sending the deconfliction to a controller of the satellite. Other embodiments are disclosed.

Abstract: Methods of mitigating interference to a Mobile Satellite Service (MSS) satellite from terrestrial Broadband Wireless Access (BWA) base stations are provided. A method includes receiving, at the terrestrial BWA base station, a pilot signal on a satellite downlink frequency, and adjusting terrestrial BWA communication on a satellite uplink frequency that corresponds to the satellite downlink frequency, responsive to the pilot signal.

Abstract: In order to maintain performance during wireless communication, a transmitting electronic device may selectively perform a remedial action based on a received power in a channel during time intervals between received packets (e.g., due to interference) and/or a metric associated with the measured received power. In particular, when the received power is less than a threshold value (e.g., when the interference is insufficient to stop transmission by the transmitting electronic device), the transmitting electronic device performs the remedial action based on the measured received power and/or the metric. For example, the remedial action may include: selecting a modulation technique; selecting the receiving electronic device; selecting an antenna pattern for the one or more antennas; reducing a transmit power; selecting a data rate; determining a cumulative distribution function; and/or estimating a channel capacity.

Abstract: There is disclosed a method of operating a radio node in a wireless communication network. The method includes transmitting pulse-shaped signaling based on a pulse-shaped waveform using a transmission power, the transmission power being based on an Error Vector Magnitude (EVM) parametrisation for pulse-shaped signaling. The disclosure also pertains to related devices and methods.

Abstract: Presented herein are systems and methods that provide traffic recover when virtual router redundancy protocol (VRRP) virtual media access control (VMAC) failures occur in a link aggregation group fabric environment. In one or more embodiments, automatic traffic recovery may be accomplished using internode link control messages to synchronize a VRRP VMAC failure that has been encountered by one LAG node with a LAG peer node. If a database associated with the failed LAG node comprises no entry that indicates that the failure scenario has previously occurred in the LAG peer node, a forwarding path entry rule may be generated to route traffic via the internode link, thereby, reducing data loss through routing failures and the like.

Abstract: Digital wireless distributed communications systems (WDCS) employing a centralized spectrum chunk construction of communications channels for distribution to remote units are disclosed. Individual, discrete communications channels received from one or more signal sources are centrally constructed into spectrum chunks before being distributed to remote units. When the communications channels are constructed into spectrum chunks, the individual communications channels are positioned in their respective defined center radio frequency (RF) frequencies of their respective communications band before being distributed to the remote units. Thus, the remote units do not have to include the additional cost and associated power consumption of processing circuitry to construct the communications bands for individual communications channels.

Abstract: Provided is a method for managing terminals by a base station when a plurality of networks coexist. Specifically, in a wireless communication system where a first network coexists with a second network, the terminal management method of a base station of the first network may include: receiving coexistence information from a first network management apparatus managing the base station, and examining the coexistence information; generating time information that is needed by a user equipment attached to the first network to access a third network on the basis of the coexistence information; and sending a message containing the time information to the user equipment. Thereby, it is possible to operate WiMAX and TD-LTE simultaneously while using a CDMA network for a voice service.

Abstract: An address setting and signal transmission method and LED module based on the power line working condition comprising: inputting a signal flow via a power line; demodulating, by a demodulator, the signal flow into a voltage signal and a coded signal; parsing the coded signal into an address coded signal and a control coded signal; and performing address writing on the address coded signal by a first data processor to form a comparative address database and then storing same in memory. The desired light-emitting effect is obtained by means of a second data processor processing subsequent coded signals according to the comparative address database and outputting same to a load. In an LED module made according to this method, the number of power line beams is saved, and coding location of the address of a lamp bead string is implemented easily by means of coding.

Abstract: A recoding medium storing a computer program, which, when executed by a processor, cause the processor to perform operations including: determining a pattern of a change in luminance, by modulating the signal to be transmitted; and transmitting the signal, by at least one light emitter changing in luminance according to the determined pattern of the change in luminance. The signal has a plurality of blocks, each block of the plurality of blocks includes (i) address information that indicates a position of a data segment in the signal and (ii) the data segment. In the transmitting, the signal is transmitted repeatedly at different times. The address information is used to identify a same location of the block data segment in the signal transmitted at a first time and in the signal transmitted at a second time, which is different from the first time. The signal has a check signal.

Abstract: In order to maintain performance during wireless communication, a transmitting electronic device may selectively perform a remedial action based on a received power in a channel during time intervals between received packets (e.g., due to interference) and/or a metric associated with the measured received power. In particular, when the received power is less than a threshold value (e.g., when the interference is insufficient to stop transmission by the transmitting electronic device), the transmitting electronic device performs the remedial action based on the measured received power and/or the metric. For example, the remedial action may include: selecting a modulation technique; selecting the receiving electronic device; selecting an antenna pattern for the one or more antennas; reducing a transmit power; selecting a data rate; determining a cumulative distribution function; and/or estimating a channel capacity.

Abstract: The present invention relates to the field of communications technologies, and in particular, to a Radio Link Control (RLC) data packet retransmission method and an eNodeB, so as to resolve a technical problem that a throughput of user equipment (UE) is relatively low because of a relatively large retransmission delay caused when a micro eNodeB performs a hybrid automatic repeat request (HARQ) on a data packet. In embodiments of the present invention, if feedback information that is received by a macro eNodeB for an RLC data packet transmitted by a micro eNodeB is a NACK, the macro eNodeB determines whether a HARQ combination gain can be obtained by performing a HARQ on the RLC data packet by the micro eNodeB. If the HARQ combination gain can be obtained, the micro eNodeB retransmits the RLC data packet in a HARQ manner, so that the throughput of UE can be improved.

Abstract: Method to perform joint scheduling in the downlink or in the uplink of a centralized OFDM radio access network for a plurality of users considering time, frequency and space domains, scheduler device thereof and computer program products. The method to be applied in the downlink or in the uplink of a centralized radio access network based on OFDM, whereby a set of remote radio heads of a set of remote units are connected to a central unit, that performs all (or part of) the radio-related processing tasks, wherein the scheduling exploit CoMP, NOMA and RF conditions and resource blanking techniques.

Abstract: An information communication method of transmitting a signal using a change in luminance is provided. The information communication method includes: determining a pattern of the change in luminance, by modulating the signal to be transmitted; and transmitting the signal, by at least one light emitter changing in luminance according to the determined pattern of the change in luminance. The signal has a plurality of blocks. Each block of the plurality of blocks includes (i) address information to indicate a position of a data segment in the signal, and (ii) the data segment. In the transmitting, the signal is transmitted repeatedly at different times.

Abstract: A system using multiple communication technologies for concurrent communication is disclosed. The system includes a loopback receiver, a receiver, and a noise remover component. The loopback receiver is configured to obtain a coupled signal and generate a noise signal from the coupled signal. The noise signal includes direct transmission noise. The receiver is configured to receive a chain receive signal and to provide a receive signal therefrom. The noise remover component is configured to generate a wanted receive signal from the noise signal and the receive signal.

Abstract: It is described a method for transmitting channel quality information between a second network element and a first network element. The method comprises includes (a) dividing a range of possible radio channel qualities between the two network elements into a fixed number of quality classes, (b) measuring the quality of a radio channel between the two network elements, (c) selecting one quality class out of the fixed number of quality classes based on the measured quality of the radio channel, (d) transmitting from the second network element to the first network element a first channel quality information being indicative for the selected quality class, and (e) transmitting from the second network element to the first network element a second channel quality information being indicative for the measured quality within the limits of the selected quality class. It is further described the first and the second network element, which in conjugation with each other are adapted to carry out the described method.

Abstract: In one embodiment, a method comprises determining a movable network device is moving along a repeatable sequence of access point devices in a deterministic network; and establishing a deterministic track along the repeatable sequence of access point devices, the deterministic track comprising insertion slots allocated for insertion of a data packet, by the movable network device, into the deterministic track via any one of the respective access point devices.

Abstract: Provided is a method for controlling uplink power, which includes that: a Node B makes statistics on a transmit Total Power (TP) value of all users in a cell, compares the obtained transmit TP value with a received TP threshold value of the cell, and when it is determined that the transmit TP value is smaller than the received TP threshold value of the cell and a difference between the transmit TP value and the received TP threshold value is smaller than an abundance threshold, allows a user satisfying an intervention strategy of the cell to increase power. A device for controlling uplink power is also provided.

Abstract: The present invention discloses schemes to perform load control taking uplink BLER statistics into account. An uplink load control method and apparatus are provided in a wireless communication system. The uplink load control method comprises estimating uplink load budget in a cell of the wireless communication system; determining whether the cell is over-loaded based on Block Error Rate (BLER) statistics of non-Guarded Bit Rate (non-GBR) users in the cell and/or Fast Congestion Control (FCC) action statistics in the cell; decreasing the uplink load budget if it is determined that the cell is over-loaded; and increasing the uplink load budget if it is determined that the cell is not over-loaded. Preferably, increasing or decreasing of the uplink load budget is based on the BLER stastics BLERstatistic of targeted users by FCC.

Abstract: A method of determining a filter of a relay and the relay for performing the same are disclosed. The method of determining a filter of a relay to minimize data estimation error in a relay environment considering a direct link includes (a) setting a power constraint condition of the relay so that maximum value of eigenvalue of a transmission covariance matrix of the relay is less than maximum transmission power usable at respective antenna; and (b) determining a transmission filter of the relay using the maximum transmission power usable at respective antenna according to the set power constraint condition.

Abstract: A mobile vehicle communications system and a method of sending one or more secure short message service (SMS) messages using that system. The method includes the steps of: (a) determining at a sender a data quantity associated with zero or more proprietary data parcels (PDPs) to send within one or more SMS messages; (b) configuring an encrypted payload of each of the one or more configured SMS messages to carry the total number of PDPs, wherein when the size of the payload would result in an SMS message exceeding 140 bytes, the configuring step includes configuring a plurality of SMS messages to carry the payload; and (c) transmitting from the mobile originated device one or more configured SMS messages.

Abstract: An approach for enabling the generation of a location record at a device based on a location not associated with a pre-stored location record is described. A location reference platform determines at least one location is not associated with one or more pre-stored location records at at least one device. The location reference platform also causes, at least in part, a generation of at least one location record for the at least one location. The location reference platform further causes, at least in part, a transmission of the at least one location record to the at least one device for storage with the one or more pre-stored location records.

Abstract: Various methods and systems are provided for allocating time-frequency resources for downlink (DL) and uplink (UL) communications between base stations and mobile stations. Different forms of resource allocation messages including combinations of bitmaps and bitfields provide additional information about the resources and/or how they are assigned. In some implementations the resource allocation messages enable reduced overhead, which may ultimately improve transmission rates and/or the quality of transmissions.

Abstract: A method of operating a wireless device associated with a first cell includes receiving information on a first set of resources for intracell peer-to-peer communication and on a second set of resources for intercell peer-to-peer communication. In addition, the method includes utilizing at least one of the first set of resources to communicate with a second wireless device within the first cell or the second set of resources to communicate with the second wireless device within a second cell based on the received information.

Abstract: An information processing apparatus includes a first port coupled to a first network, a second port coupled to a second network, a first memory, and a first processor coupled to the first memory and configured to execute first routing processing related to communication performed by the information processing apparatus and a first information processing apparatus coupled to the first port through the first network, execute second routing processing related to communication performed by the first information processing apparatus and a second information processing apparatus coupled to the second port through the second network, when a failure occurs in the first port, cause a third information processing apparatus coupled to both of the first and second networks to execute the first routing processing, and when a failure occurs in the second port, cause the third information processing apparatus to execute the second routing processing.

Abstract: According to one embodiment, Layer-3 (L3) distributed router functionality is provided to a switch cluster by receiving an address resolution protocol (ARP) request packet from a first host at an entry switch in a switch cluster, a switch controller being in communication with the entry switch, and the ARP request packet including a virtual router IP address of the switch controller as a target, forwarding the ARP request packet to the switch controller after adding a header that adheres to a communication protocol used by the switch controller, receiving an ARP response packet from the switch controller indicating: a source IP address corresponding to a virtual router of the switch controller and a SMAC corresponding to the switch controller, forwarding the ARP response packet to the first host after stripping the communication protocol header, and setting the virtual router as a default gateway for traffic received from the first host.

Abstract: Methods are disclosed for improving communications on feedback transmission channels, in which there is a possibility of bit errors. The basic solutions to counter those errors are: proper design of the CSI vector quantizer indexing (i.e., the bit representation of centroid indices) in order to minimize impact of index errors, use of error detection techniques to expurgate the erroneous indices and use of other methods to recover correct indices.

Abstract: A wireless communication system includes: a control module configured to calculate a maximum throughput to represent a spectral efficiency; a storage module, coupled to the control module, configured to store the maximum throughput in a throughput table; and a communication module, coupled to the control module, configured to transmit a channel quality indicator as a feedback, selected from the throughput table, based on a largest value of the maximum throughput.

Abstract: A solution for virtual router redundancy for server virtualization includes, at a network device configured as a backup router of a virtual router, examining a packet stored in a memory of the network device. Responsive to the examining, the network device determines whether to forward the packet via a network towards a destination or to send the packet via the network to a master router of the virtual router for forwarding of the packet, by the master router, towards the destination.

Abstract: A method and apparatus for processing a signal. The signal is received in a receiver system in a satellite. The signal has a range of frequencies in which information is carried in a number of channels having a number of frequencies within the range of frequencies. The number of frequencies for a channel in the number of channels changes within the range of frequencies over time. The signal is transmitted using a transmitter system in the satellite. The signal is unprocessed to identify the number of frequencies for the channel used to carry the information by the satellite.

Abstract: Apparatus for use in a communications satellite to select signals in a first frequency range from a received multiplexed signal comprises a first mixer arranged to mix the received signal with a first local oscillator LO signal to down-convert the received signal so that a signal within the received signal at a centre frequency of the first frequency range is converted to an intermediate frequency IF, a bandpass filter arranged to filter the mixed signal such that the filter bandwidth defines the width of the first frequency range, the bandpass filter having a passband with a centre frequency at the IF, and a second mixer arranged to mix the filtered IF signal with a second LO signal to up-convert the IF signal to the output frequency range. One of the first and second LO signals is a mixed LO signal obtained by mixing the other one of the first and second LO signals with a third LO signal, and the output frequency range is different to an input frequency range in which the multiplexed signal was received.

Abstract: A wireless terminal transmits a result of measuring received power of a downlink wireless signal from a femtocell base station to a macrocell base station. The macrocell base station transmits an interference control request including identification information of the wireless terminal to a femtocell base station group of which received power of a downlink signal included in a measurement result transmitted from the wireless terminal is a predetermined value or more. The femtocell base station has an adjacent wireless terminal list in which identification information of a wireless terminal, which is capable of being connected to an adjacent femtocell base station but is not capable of being connected to the femtocell base station, is recorded, and downlink transmission power of the femtocell base station is reduced when the identification information included in the interference control request is included in this list.

Abstract: A method and apparatus for processing a signal. The signal is received in a receiver system in a satellite. The signal has a range of frequencies in which information is carried in a number of channels having a number of frequencies within the range of frequencies. The number of frequencies for a channel in the number of channels changes within the range of frequencies over time. The signal is transmitted using a transmitter system in the satellite. The signal is unprocessed to identify the number of frequencies for the channel used to carry the information by the satellite.

Abstract: A system and method for dynamically optimizing the performance of indoor distributed antenna systems communicate to user equipment is disclosed. The user equipment measures information describing the downlink signals such as the downlink data rates, the quality of the received signal, and the location of the user equipment. A service module collects this information and determines an optimized power level for each of the antenna units. The service module may optimize only one antenna unit power level or a subset of the antenna units within the distributed antenna system in a preferred embodiment. One or more of the antenna units then transmits downlink signals with the optimized power levels. The optimized power level may be less than the initial power level in a preferred embodiment. As a result, the performance of the indoor distributed antenna systems is enhanced.

Abstract: Techniques for performing transmit power control based on receiver gain setting in a wireless communication network are described. In an aspect, a terminal A may estimate pathloss to another terminal B, e.g., based on a peer discovery signal received from terminal B. Terminal A may then determine a transmit power level for a peer-to-peer (PTP) signal (e.g., a paging signal) based on the estimated pathloss, a receiver gain setting at terminal B, and a target received power level for the PTP signal. Terminal A may send the PTP signal at the determined transmit power level to terminal B. In another aspect, terminal B may use different receiver gain settings in different time intervals to receive PTP signals from other terminals. Terminal A may then select a suitable time interval to send the PTP signal based on the pathloss and the different receiver gain settings used by terminal B.

Abstract: A method in a wireless network containing a first node and an adjacent second node for determining an uplink received power target value of the second node to be used by a user equipment which is to be served by the second node includes establishing the uplink received power target value of the first node. The method also includes obtaining the downlink power capacity of the first node and obtaining the downlink power capacity of the second node. Additionally, the method includes calculating the difference in downlink power capacity between the first node and the second node and determining the uplink received power target value of the second node based on the calculated difference in downlink power capacity between the nodes and the established uplink received power target value of the first node.

Abstract: A method, an apparatus, and a computer program product for wireless communication are provided. The apparatus receives an intended signal from a first wireless device operating in a full-duplex mode, receives an interfering signal from a second wireless device communicating with the first wireless device, and reduces an interference of the received intended signal caused by the interfering signal by projecting a matrix of the received intended signal onto a space associated with the interfering signal.

Abstract: Methods and arrangements in a telecommunication network for intercell interference coordination. The telecommunication network comprises a first base station, acting as serving base station for a mobile station, and a second base station. The method comprises determining that transmission interference to the mobile station is to be limited. The method also comprises triggering the mobile station to send a signal on a radio resource, which signal is to be received by the second base station, enabling the second base station to select a transmission parameter that limits interference for the mobile station.

Abstract: A network node determines one or more parameters related to a Specific Absorption Rate (SAR) target, where SAR is a measure of a maximum energy or power absorbed by a unit of mass of tissue exposed to radio frequency (RF) electromagnetic field (EMF) radiation generated as a result of radio transmissions generated by a UE. The network node generates content for a message for transmission to the UE including the determined one or more SAR-related parameters to be applied by a transmitter in the UE. Based on those one or more SAR-related parameters, the UE determines and implements an action in order to meet the SAR target. Other example embodiments permit the UE to determine the SAR-related parameters in other ways.

Abstract: Methods of reverse link power control are provided. In one example embodiment, a signal-to-interference+noise (SINR) is measured for a plurality of mobile stations. A power control adjustment is determined for each of the mobile stations based on the measured SINR for the mobile station and a fixed target SINR, the fixed target SINR being used in the determining step for each mobile station and sending the power control adjustments to the mobile stations. In another example embodiment, one or more signals are transmitted to a base station. A power control adjustment indicator indicating an adjustment to a transmission power level is received. The received power control adjustment is determined based on a measured signal-to-interference+noise ratio (SINR) for the one or more transmitted signals and a fixed target SINR threshold, the fixed target SINR threshold being used for power control adjustment of a plurality of mobile stations.

Abstract: A method and apparatus are described for controlling transmitter power in a wireless communication system in which both dedicated and shared channels are utilized. A wireless transmit/receive unit (WTRU) may receive a first channel (e.g., downlink shared channel), power commands for a second channel (e.g., dedicated channel) and power commands for a third channel (e.g., uplink shared channel). The WTRU may transmit in a transmission time interval at least one of the second channel and the third channel. Acknowledgments and negative acknowledgements to signals received over the first channel may be sent on the third channel. The WTRU may determine a transmission power level of the second channel in response to the second channel power commands and not the third channel power commands. The WTRU may determine a transmission power level of the third channel in response to the third channel power commands and not the second channel power commands.

Abstract: A radio communication system whereby a range is enabled and communication control and quality can be ideally maintained even if the communication distance changes. The transmitting apparatus has a transmitting unit that repeatedly transmits one data packet; a receiving unit that repeatedly receives a response packet; an integrating unit that integrates a repeatedly received response packet; and a determining unit that determines, by use of a result of the integration, whether the received response packet is correct. The receiving apparatus has a receiving unit that repeatedly receives a data packet; an integrating unit that integrates a repeatedly received data packet; a determining unit that determines, by use of a result of the integration, whether the received data packet is correct; and a transmitting unit that repeatedly transmits the response packet when determination is made that the received data packet is correct.

Abstract: A free space optical communication system (100) and method including: several optical beam expanders (414) for receiving incoming optical signals from ground sites and neighboring satellites; several optical preamplifiers (412) for preamplifying the received optical signals; one or more optical main amplifiers (404) for amplifying the preamplified optical signals; and an optical switch (408) for directing respective amplified optical signals to respective destinations via a respective optical beam expander. The respective amplified optical signals are inputted to a respective optical beam expander (414) for transmission to said respective destinations, as outgoing optical signals.

Abstract: Techniques for improving reliability of control information are described. A transmitter determines if improved reliability is applicable for at least one control symbol to be sent in a timeslot. The transmitter sends the control symbol(s) without improved reliability if deemed not applicable and with improved reliability if deemed applicable. A receiver receives the control symbol(s) and identifies each received control symbol as a reliable control symbol or an unreliable control symbol based on the received signal quality of the received control symbol and a threshold. The receiver adjusts a control loop based on reliable control symbols. The receiver also combines unreliable control symbols to obtain combined symbols and selectively adjusts the control loop based on the combined symbols. The control loop may be for transmit power or timing.

Abstract: A method and an arrangement in a radio network node for adapting transmission power of resource elements for demodulation reference signals, referred to as “reference elements” are provided. The radio network node is configured for multiple-input multiple-output transmission, referred to as “MIMO transmission”, to a user equipment. The MIMO transmission comprises at least three layers. Two consecutive subcarriers of a resource block carry at least three reference elements. A first subcarrier of the resource block carries data elements. The radio network node adapts transmission power of said at least three reference elements such that an average transmission power, over said two consecutive subcarriers, of said at least three reference elements is equal to a transmission power, for the first subcarrier, of the data elements for said at least three layers. The radio network node uses the adapted transmission power to transmit, to the user equipment, said at least three reference elements.

Abstract: A method and system of a relay node managing interference in a multi-hop network and a relay node that manages interference is provided. The relay node may determine whether an interference neutralization condition for neutralizing interference among pairs of transmitting nodes and receiving nodes is satisfied, select one of a full interference neutralization and a partial interference neutralization, based on a result of the determination and perform the selected interference neutralization with respect to the pairs of the transmitting nodes and the receiving nodes.

Abstract: Aspects of the disclosure are related to identifying whether an apparatus (e.g., base station, access point, etc.) is transmitting using a CRS based transmission scheme or a UE-RS based transmission scheme. Such detection may be necessary for PDSCH interference cancellation (IC) of a neighboring cell since a UE may not know which transmission scheme is used by the neighboring cell. For instance, the UE may know the transmission scheme of the serving cell, but the UE may not know the transmission scheme of a neighboring non-serving cell. As such, aspects of the disclosure provide for a blind detection algorithm to identify or determine a transmission mode or transmission scheme of a neighboring cell to then apply interference cancellation (IC) to an interfering signal received from the neighboring cell.

Abstract: Embodiments of a system and method for transmitting data from an access point in a multiple user multiple input multiple output (MU-MIMO) system are provided. A first indication of signal quality (ISQ) is received at the access point from a first station and a second ISQ is received from a second station. The access point sets a first power level and a first modulation and coding scheme (MCS) for transmission of a first aggregated media access control (MAC) protocol data unit (A-MPDU) to the first station as a function of the first ISQ and an amount of payload data corresponding to the first A-MPDU. The access point also sets a second power level and a second MCS for transmission of a second A-MPDU as a function of the second ISQ and an amount of payload data corresponding to the second A-MPDU.

Abstract: An application to be booted is selected and operation of the application is controlled according to status of a link between an access point and a station. A station (STA) which can be connected to an access point (AP) includes a link information obtaining procedure which obtains link information including an identifier of the AP to which the STA is connected while the STA is connected to the AP and an application control procedure which selects an application to be booted according to the link information by referring to an action profile in which an identifier of the link information and an application to be booted are related and registered.

Abstract: A free space optical communication system (100) and method including a constellation of several satellites (102). Each of satellites including: several inter-satellite optical telescopes (204) for optical communication with multiple neighboring satellites, each inter-satellite optical telescope is capable of adjusting its elevation angle; and several up/down link optical telescopes (206) for optical communication with multiple ground sites. As the constellation passes a given ground site, some of the up/down-link telescopes of a given satellite are configured to track at least two respective ground optical telescopes of the given ground site and send data to the ground optical telescope with the clearest line of sight to the given satellite. Moreover, each of the satellites includes optical circuitry (208, 210, 212, 216) for optically processing and switching incoming and outgoing optical signals without converting the optical signals into electrical signals.