Abstract: A radio station (3) allocates a first plurality of time-frequency resources (430) and a second plurality of time-frequency resources (530) to at least one radio terminal (1, 2). The first plurality of time-frequency resources (430) are used to transmit or receive a first transport block (460) in accordance with a first transmission time interval (TTI). The first TTI is equal to a duration of one subframe (410, 510). The second plurality of time-frequency resources (530) are used to transmit or receive a second transport block (560) in accordance with a second TTI. The second TTI is shorter than the duration of the subframe (410, 510).

Abstract: In some aspects, a base station may transmit, to a user equipment (UE), an instruction that triggers the UE to transmit an uplink random access channel (RACH) message, the instruction identifying a RACH preamble index corresponding to a RACH preamble to be used for the uplink RACH message; transmit, to a plurality of neighbor base stations, information that identifies the RACH preamble index; receive the uplink RACH message from the UE; receive, from the plurality of neighbor base stations, feedback that indicates respective timings with which the uplink RACH message was received by the plurality of neighbor base stations; and estimate a position of the UE based at least in part on a timing with which the uplink RACH message was received by the base station and at least two of the respective timings with which the uplink RACH message was received by the plurality of neighbor base stations.

Abstract: A high throughput fractionated satellite (HTFS) system and method where the functional capabilities of a conventional monolithic spacecraft are distributed across many small or very small satellites and a central command and relay satellite, the satellites are separated and flight in carefully design formations that allows the creation of very large aperture or apertures in space drastically reducing cost and weight and enabling high throughput capabilities by spatially reuse spectrum.

Abstract: Disclosed are a measurement synchronization method, a network device and a terminal device. The method includes: determining delay-related parameters, wherein the delay-related parameters are used to represent a delay between a satellite service link corresponding to a serving cell and a satellite service link corresponding to a neighboring cell; adjusting a measurement window according to the delay-related parameters, wherein the measurement window is acquired from measurement interval parameters configured for a network device; and measuring a synchronization signal block corresponding to the neighboring cell according to the adjusted measurement window.

Abstract: The embodiments of the present application relate to a method and device for determining a timing advance, applied to the establishment of a timing advance in a random access process of an NTN system. The method in the embodiments of the present application includes: receiving and acquiring relevant parameters in a configuration message, and the relevant parameters include cell common time delay information; and determining, according to the cell common time delay information, an uplink timing advance of an uplink transmission timing position with respect to a configuration message receiving position.

Abstract: The present teachings include a method and computing apparatus for triggering synchronization of a satellite modem to a carrier frequency of a beam of a satellite, retrieving ephemeris information for the satellite and beam configuration information for the beam, calculating a velocity of the satellite per the ephemeris information, and adjusting the carrier frequency of the satellite modem when communicating via the beam to compensate for a doppler offset induced in the carrier frequency by the velocity. In the method, the satellite has a satellite type selected from a Geosynchronous Earth Orbit (GEO), Medium Earth Orbit (MEO) or Low Earth Orbit (LEO) type of satellite, and the satellite type is different than a satellite type of an immediately preceding synchronization.

Abstract: A telecommunications receiver is adapted to communicate with mobile devices that operate according to a protocol where the telecommunications receiver operates outside of expected ranges for the protocol but modifies its communications with mobile devices to appear to those mobile devices as being within the expected ranges. To determine what modifications to make to transmissions, the telecommunication receiver processes signals from mobile devices to determine where a communications channel is relative to the expected ranges and uses that information to modify transmissions to mobile devices. The expected ranges might relate to maximum distance between telecommunications receiver and a mobile device, maximum relative velocity, power etc.

Abstract: Spatial and antenna information of a UAV is determined. Using at least the spatial and antenna information, a set of candidate transmission-reception beam pairs is determined, each pair between one of a set of one or more antenna panels in the UAV and one of multiple TRPs, wherein one or more of the multiple TRPs includes a receiver-only antenna panel that is oriented upward. Beam sweeping is configured to be performed for the set of candidate transmission-reception beam pairs. Based on results of the beam sweeping, a transmission-reception beam pair of the set of candidate transmission-reception beam pairs is selected to be used for uplink communication(s) from the UAV to a determined TRP in the determined best transmission-reception beam pair. The UAV may send the spatial and antenna information toward a wireless communication network including the multiple TRPs, and may send this periodically or based on thresholds.

Abstract: System including a gateway, a non-terrestrial node, a terrestrial node and at least a user equipment and a HARQ controller, the gateway being configured to forward a data packet, the data packet to be transmitted to the user equipment, to the non-terrestrial node, the non-terrestrial node being configured to forward the received data packet to the user equipment using a signal, the user equipment being configured to analyze the received data packet regarding a transmission error and/or to analyze the signal from the non-terrestrial node regarding a signal quality and to generate a negative acknowledgment command or an acknowledgement command dependent on the transmission error or to generate another signal indicating the reception signal quality dependent on the reception signal quality, the user equipment being configured to transmit the acknowledgement command and the non-acknowledgement command or the other signal to the terrestrial node communicating with the non-terrestrial node.

Abstract: Apparatuses and methods in a communication system are provided. The solution for transmitting a message for multiple vehicular recipients comprises determining (200) the vehicular recipients of the message in one or more coverage areas; estimating (202) the amount of resources needed in transmission the message using broadcast or separate unicast messages or the number of vehicular recipients that cannot receive broadcast message, or both, and transmitting (204) the message either as a single broadcast message to the vehicular recipients in each coverage area or as a unicast message separately to each vehicular recipient or both, depending on the amount of resources needed in transmission or the number of vehicular recipients that cannot receive the broadcast message, or both.

Abstract: A system and method provide an enhanced listening experience for a user and a radio receiver or other device that receives broadcast or streamed content having a plurality of program channels. The method and system buffer designated channels at the receiver and, when switching among channels, play back the buffered designated channels during reception from a selected point therein depending on the channel or other criteria. When switching to a different channel during reception, a user is able to hear content in a buffered program channel with music from the start of a song, for example, whereas content in a channel with news, talk radio, or live sports is played back from live reception, even though the content segments are transmitted a different start times relative to thier selected times for playback following a channel change. User controls allow navigation among buffered designated channels during reception.

Abstract: A method and apparatus is provided to use a value tag in conjunction with transmission and/or processing of system information in a wireless communication network, specifically in conjunction with second type system information or non-essential type system information. An access node may initiate broadcasting second type system information when the second type information content is updated, in order to avoid multiple on-demand delivery requests from wireless terminals. The access node may compress second type system information to be delivered by broadcast.

Abstract: A system includes a transmitter for use in conjunction with a horizontal directional drilling system that transmits a multi-bit symbol stream that characterizes sensor symbols for receipt by an aboveground portable device. The portable device receives the symbol stream for aboveground recovery of the sensor signals. The transmitter can precisely place the symbol frequencies at least to avoid a noise environment, as well as to avoid powerline harmonics, and can utilize wave shaping for transmitted symbols at least to provide for transmission power control, spectral content control and wideband antenna matching. The receiver can measure the noise environment to identify the symbol frequencies used by the transmitter. The noise can be scanned at an incremental resolution across a wide frequency bandwidth for display or automatic symbol frequency selection.

Abstract: A method and an apparatus are provided for monitoring a physical downlink control channel (PDCCH) by a user equipment (UE) in a wireless communication system. The UE receives a system information block (SIB) from a network. The UE identifies at least one downlink (DL) period based on a first time division duplex (TDD) uplink (UL)/DL configuration included in the SIB; monitoring, by the UE, the PDCCH during the at least one DL period using a discontinuous reception (DRX) operation. The UE obtains information about at least one second TDD UL/DL configuration for one or more time intervals from the monitored PDCCH. The monitoring of the PDCCH comprises monitoring the PDCCH in an active time of a DRX cycle. The active time includes a time when the UE performs continuous reception.

Abstract: A computer implemented method and apparatus for automatic antenna alignment. The method comprises receiving a request to initiate antenna alignment; collecting location data from the drone; collecting location data from the target device; calculating bearing and altitude of the drone and the target device using the collected location data; and aligning the drone with the target device based on the calculated bearing and altitude.

Abstract: Systems and methods are disclosed, and one includes receiving an encoded data stream, generating a first upsampled encoded block, based on a first upsampling rate upsampling of a first content from the data stream, communicating the first upsampled encoded block to a beam hopping satellite, on an uplink, during an uplink first time interval having a synchronization with a first beam of the beam hopping satellite, as a feed for the first beam. The systems may further include generating, starting at a time within the uplink first time interval, a second upsampled encoded block, based on a second upsampling rate upsampling of a second content from the data stream, and communicating the second upsampled encoded block via the uplink to the beam hopping satellite, during an uplink second time interval having a synchronization with a second beam of the beam hopping satellite, as a feed for the second beam.

Abstract: A method for handling network feature capabilities is provided. The method includes a UE determining whether a first access network with a first access type and a second access network with a second access type are registered on the same PLMN; if the first access network and the second access network register on the same PLMN, the UE determines whether a first registration procedure over the first access network occurred earlier than the second registration procedure over the second access network. The first registration procedure corresponds to first setting values for a plurality of network feature capabilities and the second registration procedure corresponds to second setting values for the network feature capabilities. If the first registration procedure over the first access network occurred earlier than the second registration procedure over the second access network, the UE adopts the second setting values for the network feature capabilities.

Abstract: A method of performing communication between a satellite and a ground segment, the satellite comprising a platform and a payload, the ground segment includes at least one satellite control center configured to generate or process data associated with the satellite platform, the satellite control center directly communicating with the satellite platform on a dedicated channel, referred to as platform channel, wherein the method comprises a step of directly communicating, between the mission control center and an on board processing unit which is configured to manage at least a part of the payload of the satellite, telecommand or telemetry data of the part of the payload of the satellite, on another dedicated channel, referred to as signalling channel, the signalling channel and the platform channel being distinct.

Abstract: A communication terminal apparatus, a terrestrial cellular base station and a mobile communication system are provided, which are capable of being shared in a terrestrial cellular mobile communication system and a satellite mobile communication system, and preventing an interference between beams in a satellite mobile communication system while preventing an interference between both systems by a simple switching control of radio resources. Time slots of radio resources are allocated so as not to overlap with each other between the terrestrial cellular mobile communication system and the satellite mobile communication system and so as not to overlap with each other between adjacent beams corresponding to each of two or more beams of the satellite mobile communication system.

Abstract: Method and apparatus use a value tag in conjunction with transmission and/or processing of system information in a wireless communication network, especially in conjunction with second type system information or non-essentially type system information. In certain example embodiment and modes, an access node (22) may initiate broadcasting second type system information when its content gets updated, in order to avoid many on-demand delivery requests from wireless terminals. In certain example implementations, the access node (22) may compress second type system information to be delivered by broadcast.

Abstract: A control information exchange system includes a sender device coupled to a receiver device and including a sender device application that periodically generates and transmits control packets that are directed to the receiver device. A control packet engine in the sender device receives a first control packet from the sender device application, performs a hashing operation on the first control packet to generate a first hash value, stores the first hash value in a sender device database, and transmits the first control packet to the receiver device. When the control packet engine subsequently receives a second control packet from the sender device application, it performs the hashing operation on the second control packet and, in response that hashing operation generating the first hash value, it transmits the first hash value to the receiver device to indicate the second control packet was duplicative of the first control packet.

Abstract: The present disclosure relates to a 5th generation (5G) or pre-5G communication system for supporting a higher data rate in comparison to the 4G communication system, such as long term evolution (LTE). A method for a terminal to establish synchronization with another terminal in a network supporting device-to-device (D2D) communication is provided. The method includes scanning, at the terminal, for synchronization signals from at least one base station, acquiring, when a synchronization signal is received from a base station, synchronization with the base station based on the synchronization signal, measuring power of the synchronization signal received from the base station, and transmitting, when data to be transmitted are generated in idle mode and the received signal power is less than a received signal power, a synchronization signal as a synchronization relaying terminal.

Abstract: Example methods and apparatus to generate recommendation(s) for access point association by a client device are disclosed. An example method includes calculating an effective uplink data rate for the client with respect to a first access point based on a) an uplink data rate and b) a percentage of uplink airtime available to the client. The example method includes calculating a first effective downlink data rate with respect to the first access point based on a) a downlink data rate for and b) a percentage of downlink airtime available to the client. The example method includes computing a first metric for the first access point based on the first effective uplink data rate, the first effective downlink data rate, and a noise floor scaling factor. The example method includes generating an access point recommendation by comparing the first metric and a second metric for a second access point.

Abstract: A user apparatus configured to communicate with a base station in a mobile communication system that supports carrier aggregation formed by a plurality of cells including a first cell and a second cell that uses a unit time length different from a unit time length of the first cell, including: a reception unit configured to receive downlink data transmitted from the base station in the second cell, and generate transmittal acknowledgement information for the downlink data; and a transmission unit configured to bundle a plurality of pieces of transmittal acknowledgement information, generated in the reception unit, for a plurality of pieces of downlink data into one piece of transmittal acknowledgement information to transmit the bundled transmittal acknowledgement information to the base station in the first cell.

Abstract: Traditional satellite-to-earth data transmission systems are constrained by inefficient relay schemes and/or short-duration data transfers at low data rates. Communication systems described herein achieve extremely high burst rate (e.g., 10 Gbps or greater) direct-to-Earth (DTE) data transmission over a free-space optical link between a spacecraft and a remote terminal, which may be a ground terminal or another space terminal. The optical link is established, for example, when the remote terminal is at an elevation of 20° with respect to a horizon of the remote terminal. In some embodiments, a data transmission burst contains at least 1 Terabyte of information and has a duration of 6 minutes or less. The communication system can include forward error correction by detecting a degradation of a received free-space optical signal and re-transmitting at least a portion of the free-space optical signal.

Abstract: The invention relates to an AIS data transmission method using AIS standard-compliant AIS signals. The AIS data (5) to be transmitted is converted into AIS signals on the transmitter side and transmitted via a main channel (41). The AIS signals are received in an AIS receiver (2, 3) and converted back into received AIS data (6, 7). Error-correcting redundancy data is generated from the AIS data (5) to be transmitted or from parts of said data on the transmitter side, and the redundancy data can be used on the receiver side to correct errors of the received AIS data (6, 7). The redundancy data is converted into redundancy signals on the transmitter side and transmitted via an auxiliary channel (42) provided in addition to the main channel (41). The invention further relates to a corresponding AIS transmitter, a corresponding AIS receiver, and an AIS transceiver. The invention further relates to a system consisting of AIS transmitters and AIS receivers and to a computer program.

Abstract: A relay station comprising: a time server that supplies time-synchronized pulse data generated every second; and a symbol counter that counts symbol periods used in communication, based on the pulse data. The relay station transfers an upstream signal to a simulcast controller, by including in the upstream signal a first count value of the symbol counter that indicates a timing when synchronization with the upstream signal is established. The simulcast controller calculates a second count value based on the first count value to indicate a timing of transmission of the downstream signal from the relay station to the terminal device, transfers the downstream signal for transmission from the relay station to the terminal device, with the second count value being included in the downstream signal. The relay station starts transmitting the downstream signal based on the second count value.

Abstract: A test webpage triggers a remote computer to obtain a token for the performance test from a test data collection server. The test webpage triggers the remote computer to transmit the token to a reflector server to initiate the performance test. The reflector server initiates the performance test upon validating the token. The reflector server performs bidirectional communication of test data over a Web Real-Time Communication (WebRTC) data channel using a loss tolerant protocol with the remote computer. The remote computer is able to determine computer-endpoint test results from the bidirectional communication of test data. The reflector server determines server-endpoint test results from the bidirectional communication of test data. The reflector server transmits the server-endpoint test results to the remote computer. The test webpage triggers the remote computer to transmit the computer-endpoint and the server-endpoint test results to the test data collection server.

Abstract: An antenna automatic alignment method for a rotor unmanned aerial vehicle (UAV) includes acquiring current feature information of a plurality of antennas of the rotor UAV in real time. The antennas are disposed at substantially U-shaped landing gears of the rotor UAV. The method further includes selecting one of the antennas to establish a point-to-point communication link with a remote controller of the rotor UAV in accordance with the current feature information of the plurality of antennas. The antennas include spare antennas and current communication antennas, and a number of the spare antennas equals a number of the current communication antennas.

Abstract: The invention comprises an operating method of a terminal device, which is configured for radio communication via different frequency bands, in performing a network scan, the method comprising: receiving a command for starting a network scan; in response to receiving the command, attempting a synchronization with predefined control channels on all frequency bands receivable by the terminal device or on a subset thereof comprising a plurality of the frequency bands, and, upon successful synchronization with a respective one of the control channels, ascertaining respective network-configuration information provided via the respective control channel by a respective network; determining, using the network-configuration information ascertained, an estimate of a quantity indicative of an achievable data throughput, hereinafter throughput estimate, associated with the respective ascertained network-configuration information; generating and providing an output, which is indicative of at least one of the determined t

Abstract: Method and apparatus use a value tag in conjunction with transmission and/or processing of system information in a wireless communication network, especially in conjunction with second type system information or non-essentially type system information. In certain example embodiment and modes, an access node (22) may initiate broadcasting second type system information when its content gets updated, in order to avoid many on-demand delivery requests from wireless terminals. In certain example implementations, the access node (22) may compress second type system information to be delivered by broadcast.

Abstract: Systems and methods for generating a playlist on a device for a user of a music service are provided. In embodiments, the device can be connected to the music service during an online mode. During operation in the online mode, the device can stream media objects from the music service. While still operating in the online more, the music service can identify additional media objects accessible through the music service to be stored in the playlist at a cache memory of the device. The music service can identify the additional media items by determining that the additional media objects satisfy one or more pre-designated conditions. The device can also operate in an offline mode, where the device is not connected to the music service. During operation in the offline mode, the device cannot stream media objects from the music service, but can playback the additional media objects stored in the playlist.

Abstract: Described herein are ground based subsystems, and related methods, for use in transmitting an optical feeder uplink beam to a satellite that is configured to receive the optical feeder uplink beam and in dependence thereon produce and transmit a plurality of RF service downlink beams within a specified RF frequency range to service terminals. Certain embodiments are related to a resource allocator for inclusion in a ground based subsystem, and methods for use therewith. Beneficially, the resource allocator, and methods for use therewith, eliminate any need for a satellite to perform any bandwidth allocation for the plurality of service downlink beams produced and transmitted by the satellite, thereby eliminating any need for the satellite to include an on-board channelizer. Such a recourse allocator can include a plurality of channels each of which can include an encoder and modulator, a channel filter, and a frequency up-converter.

Abstract: A system and method provide an enhanced listening experience for a user of a radio receiver or other device that receives broadcast or streamed content having a plurality of program channels. The method and system buffer designated channels at the receiver and, when switching among channels, play back the buffered designated channels during reception from a selected point therein depending on the channel or other criteria. When switching to a different channel during reception, a user is able to hear content in a buffered program channel with music from the start of a song, for example, whereas content in a channel with news, talk radio, or live sports is played back from live reception, even though the content segments are transmitted at different start times relative to their selected times for playback following a channel change. User controls allow navigation among buffered designated channels during reception.

Abstract: In one aspect of the teachings herein, a radio network node advantageously adapts the transmission duration of a synchronization signal with respect to transmission of the synchronization signal in different directions. For example, the radio network node uses a shorter transmission duration in beam directions that are associated with better reception conditions and a longer transmission duration in beam directions that are associated with poorer reception conditions. As a consequence of varying the transmission duration according to received-signal qualities known or expected for the different directions, the radio network node can shorten the overall time needed to complete one synchronization-signal transmission cycle and use less energy, as compared to using a more conservative, longer transmission time in all beam directions.

Abstract: In one or more mobile stations of a wireless communication network, a method for network node selection in a wireless communication system by a mobile entity may include receiving, from a home network, a message comprising a policy associated with network node selection, determining whether the home network policy has precedence over a policy of a visited network based on the message, and selecting a network node based on the policy of the home network, in response to determining the home network policy has precedence over the visited network policy. The policy may include at least one of mobility or routing policies. The message may include an indication of precedence between the home network and one or more visited networks. A communication apparatus, for example a mobile entity, may be configured for performing these and other aspects of the method.

Abstract: A wireless communication device including a first transceiver which performs communication by using each of a plurality of channels contained in a first frequency band, a second transceiver which performs communication by using each of a plurality of channels contained in a second frequency band that is higher than the first frequency band and separated from the first frequency band through a separation band having a predetermined frequency span, and a control device connected to the first transceiver and the second transceiver capable of communicating with the first transceiver and the second transceiver, selects one channel from the plurality of channels of the fist frequency band and one channel from the plurality of channels of the second frequency band to set a channel pair including a pair of channels, and causes the first transceiver and the second transceiver to communicate the same data by using the set channel pair.

Abstract: A handheld device, a base station and transmission control methods thereof are provided. The handheld device transmits an uplink signal to the base station. The uplink signal comprises an uplink dedicated physical data channel (UL DPDCH) carrying data information in the first half of the non-transmission gap (non-TG) data slots and a corresponding uplink dedicated physical control channel (UL DPCCH) carrying control information according to a transmission mode.

Abstract: A method in, and a Broadcast Management unit (130) for providing digital content to a user equipment (120), and a method in, and a user equipment (120) for receiving digital content. The user equipment (120) is served by a base station (110) in a cell (115) of a cellular communications network (100). The Broadcast Management unit decides (301) to provide a digital content by broadcast or multicast in a service area (105) comprising the cell (115), instead of only letting the digital content be available in the service area (105) by unicast. The Broadcast Management unit provides (302-304), in response to the decision, broadcast or multicast of the digital content in the service area (105), thereby enabling reception of the digital content by the user equipment (120) via the base station (110) and by one or more additional user equipments (121, 122, 123) being served in the service area (105). As a result, improvement of performance is enabled in the cellular communications network.

Abstract: The present invention disclose a random access method and user equipment, which relate to the field of communications and improve the transmission efficiency and reliability of a UE for sending a message to a base station in a random access process. The specific solution includes: sending a random access preamble sequence to a base station through a first antenna, so that the base station obtains the antenna number of the UE according to the random access preamble sequence, wherein the first antenna is any antenna of multiple antennas of the UE; judging whether a random access response sent by the base station is received within a preset time threshold; and sending a layer 2 or layer 3 message to the base station by using multiple antennas according to a preset rule if the random access response is received. The present invention is applied to the random access process.

Abstract: A stepwise slot allocation method and apparatus applicable to a node in a wireless network and includes: by the node, determining an initial boundary value of a slot for slot allocation at a current slot allocation stage; calculating a slot length needed by the node at the current slot allocation stage; and selecting a slot index needed by the current slot allocation stage starting from the initial boundary value. By using the method, the slot allocation is combined with an amount of traffic in the network, and slot index of each node is more proper. And it is ensured that one packet corresponds to a slot, and a case will not occur where a slot is reserved but not used.

Abstract: Various methods and apparatus are disclosed for mitigating interference between communications between different radio access technologies in a communication device. Methods and apparatus include communicating between a first communication device and a second communication device according to a first communication protocol, and communicating between the first communication device and a third communication device according to a second communication protocol. The methods and apparatus further include determining a first time interval associated with when data is to be transmitted between the first communication device and the second communication device according to the first communications protocol. The methods and apparatus also include sending to the third communication device, an indication of a second time interval to prompt the third communication device not transmit to the first communication device during the second time interval, wherein the second time interval corresponds to the first time interval.

Abstract: A transmitter time-division-multiplexes, in time domain, to assign at least a part of a second signal stream of a second channel being relatively high error-resilient compared to a first signal stream of a first channel between a boundary of the blocks and the first signal stream of the first channel of a time-division-multiplexing signal.

Abstract: Some embodiments provide a method for reducing the transmission of connection validating control signals when they are not needed. Network entities transmit connection validating control signals over network connections at regular intervals to validate that the network connections and the network entities remain functional. The method monitors data traffic fluctuations on the network connections to determine when connection validating control signals may not be needed. The method reduces unnecessary connection validating control signals in order to optimize the usage of network resources.

Abstract: A method and an apparatus for transmitting broadcast signals thereof are disclosed.

Abstract: An apparatus for transmitting and receiving system information in a wireless communication system and method thereof are disclosed. In method of receiving system information at a mobile station (MS) in a wireless communication system, the present invention includes the steps of transmitting a version of a broadcast message stored in the mobile station to a base station when failing to receive a broadcast message at a transmission time of the broadcast message or in a transmission interval of the broadcast message, and receiving a response message including the system information contained in the broadcast message being transmitted by the base station from the base station when the version of the broadcast message stored in the mobile station is different from that of the broadcast message being transmitted by the base station.

Abstract: A method at a first device for enabling a device-to-device wireless link, the method detecting whether a presence signal of a second device is received over a first time period, the presence signal of the second device having a time-slot boundary; and if the presence signal of the second device is not detected, initiating a time-slot boundary by the first device including: transmitting a first presence signal of the first device in a selected time-slot; and checking for an acknowledgment to the first presence signal.

Abstract: Serially-concatenated codes are formed in accordance with the present invention using a constrained interleaver. The constrained interleaver cause the minimum distance of the serial concatenated code to increase above the minimum distance of the inner code alone by adding a constraint that forces some or all of the distance of the outer code onto the serially-concatenated code. This allows the serially-concatenated code to be jointly optimized in terms of both minimum distance and error coefficient to provide significant performance advantages. These performance advantages allow a noise margin target to be achieved using simpler component codes and a much shorter interleaver than was needed when using prior art codes such as Turbo codes. Decoders are also provided. Both encoding and decoding complexity can be lowered, and interleavers can be made much shorter, thereby shortening the block lengths needed in receiver elements such as equalizers and other decision-directed loops.

Abstract: A radio communication device is provided including a first transceiver; a second transceiver, a first determiner configured to determine an effect of a communication by the first transceiver on the throughput of a communication by the second transceiver, a second determiner configured to determine an effect of pausing the communication by the second transceiver during the communication by the first transceiver on the throughput of the communication by the second transceiver and a controller configured to control the second transceiver to pause communication during the communication by the first transceiver if the effect of the communication by the first transceiver on the throughput of the communication by the second transceiver is higher than the effect of pausing the communication by the second transceiver during the communication by the first transceiver on the throughput of the communication by the second transceiver.

Abstract: Provided are a satellite mesh communication system and an adaptive coding modulation (ACM) control method using the same. The ACM control method include establishing, by the central station, star and mesh connections between the terminal stations, receiving, by each terminal station, a data burst including MODCOD information for ACM control through the established mesh connection, checking, by each terminal station, a mesh connection link state in response to reception of the data burst, determining, by each terminal station, new requested MODCOD information in units of established mesh connections to transmit a data burst including the determined requested MODCOD information to a partner terminal station, and changing a previous MODCOD according to the requested MODCOD to transmit a data burst in units of mesh connections according to the changed MODCOD.