173 results about "Duplex system" patented technology

Systems and methods for carrier configuration and scheduling for Subband Full Duplex (SBFD) operation in cellular communications system are disclosed. In one embodiment, a method performed by a User Equipment (UE) comprises receiving, from a network node, information that configures one or more subbands within a bandwidth of a carrier for subband full duplex operation. The received information comprises first information that configures a cell-specific Time Division Duplexing (TDD) symbol pattern for the carrier, wherein the TDD symbol pattern comprises a set of symbols. The received information further comprises second information that configures, for each symbol from at least a subset of the set of symbols within the TDD symbol pattern, one or more subbands for subband full duplex operation within the symbol. The method further comprises operating in accordance with the received information.

The present invention relates to a terminal that receives information about slots in a time division duplex (TDD) system, receives information about a plurality of subbands on frequency domain resources, and performs uplink transmission on resources within a subband that is determined to be a subband for uplink transmission on the basis of the information about the plurality of subbands.

Methods and apparatuses for transmissions and receptions in full-duplex systems. A method of operating a user equipment (UE) includes receiving a first candidate subband full-duplex (SBFD) configuration associated with a first transmission configuration indicator (TCI) state configuration on a cell; receiving a second candidate SBFD configuration associated with a second TCI state configuration on the cell; and identifying a TCI state code point. The method further includes selecting (i) the first candidate SBFD configuration when a value of the TCI state code point is associated with the first TCI state configuration or (ii) the second candidate SBFD configuration when the value of the TCI state code point is associated with the second TCI state configuration and receiving or transmitting a channel or signal based on the selected SBFD configuration.

Apparatuses and methods for dormancy indication in full-duplex (FD) systems. A method for a user equipment (UE) to receive physical downlink control channels (PDCCHs) includes receiving a set of carrier aggregation (CA) parameters for a serving cell associated with a subband full-duplex (SBFD) configuration on the serving cell and receiving a first PDCCH that provides a downlink control information (DCI) format. The DCI format includes a secondary cell (SCell) dormancy indication enabling or disabling receptions of a second PDCCH, in a downlink (DL) bandwidth part (BWP) associated with a group of configured SCells, for a symbol or a subband type. The method further includes selecting, based on the SCell dormancy indication, the symbol or the subband type for receptions of the second PDCCHs on an SCell in the group of configured SCells and receiving the second PDCCH in the BWP of the SCell at a first occasion.

Systems, methods, apparatuses, and computer program products for enhancing dynamic CORESET adaptation with limited or no control channel overhead. One method may include receiving, by a UE, a plurality of PDCCH CORESET configurations associated with at least one SS; determining, by the UE, at least one of the PDCCH CORESET configurations is associated with a symbol or slot format from a corresponding set of symbols; and performing, by the UE, PDCCH monitoring on an active control resource set configuration associated with the set of determined slots or symbols.

Methods and apparatuses for early indication for initial access in full-duplex systems. A method for operating a user equipment (UE) includes receiving a system information block (SIB1) including configuration information, identifying, based on the configuration information, a random access channel (RACH) configuration, and identifying, based on the configuration information, an early access indication associated with a full-duplex operation. The method further includes determining to use a first random access transmission configuration if a condition for the early access indication associated with the full-duplex operation is met or a second random access transmission configuration if the condition is not met and transmitting a random access message using the determined first or second random access transmission configuration.

The present disclosure provides a random access method in a wireless communication system. According to various embodiments of the present disclosure, the method performed by a user equipment in a wireless communication system may comprise the steps of: receiving, from a base station, first information for configuring a resource for a first symbol and second information for configuring a resource for a second symbol; receiving, from the base station, first downlink control information (DCI) including a first sounding reference signal resource indicator (SRI) for the first symbol and / or a second SRI for the second symbol; and transmitting, to the base station, a physical uplink shared channel (PUSCH) on the first symbol and / or the second symbol, wherein the first SRI is associated with a first SRS resource before receiving the first DCI, and the symbol type of the first symbol is the same as the symbol type of the first SRS resource, and the second SRI is associated with a second SRS resource before receiving the first DCI, and the symbol type of the second symbol is the same as the symbol type of the second SRS resource.

Embodiments of the present disclosure relate to channel state information (CSI) framework in a full duplex (FD) system. According to some embodiments of the disclosure, a UE may: determine a first type of CSI reference signal (CSI-RS) and a second type of CSI-RS based on at least one CSI-RS resource setting and a specific configuration; and measure at least one of the first type of CSI-RS or the second type of CSI-RS to derive a channel measurement or interference measurement for a CSI report.

Methods and apparatuses in a wireless communication system are provided. Capability information regarding the terminal is transmitted. The capability information is associated with an X division duplexing (XDD) system. Resource configuration information is received based on the resource configuration information. A resource on which uplink control information (UCI) is to be transmitted is determined. The UCI is transmitted on the determined resource. The XDD system configures an uplink resource and a downlink resource in a same slot in different frequency resources.

This invention presents a method and systems for beamforming in wireless communication comprising a base station with a plural of antennas and radio frequency transmitting and receiving chains, a plural of base band transmitting paths and base band receiving paths, and a processor that constructs a subspace for each user equipment using the principal angle information contained in partial channel state information obtained on channels associated with a part of the BS antennas, derives an analog beamforming matrix and / or an analog combining matrix from the subspaces of all the user equipment selected for communication with the base station to achieve analog beamforming, and further performs beamforming at the base band.

The invention provides an inter-satellite link bidirectional measurement method based on a same-time same-frequency full-duplex system, which overcomes the problem that receiving and transmitting of a traditional time-division half-duplex system cannot work at the same time and at the same frequency, and can effectively improve the information transmission rate and the ranging precision. The inter-satellite transmission rate, the measurement frequency and the data updating rate can be doubled; simultaneous and same-frequency measurement between satellites can greatly eliminate distance measurement errors caused by relative motion between satellites, clock skew and Doppler effect; a complex orbit model does not need to be established to improve the distance measurement precision, the time scale reduction error is greatly reduced, and the overall measurement performance is improved.

This disclosure describes systems, methods, and devices related to enhanced duplex communication. A device may receive an indication for PRACH resources for subband non-overlapping full duplex (SBFD) operationin downlink control information with a Cyclic Redundancy Check (CRC). The device may determine a physical random access channel (PRACH) occasion based on the indication for PRACH resources for SBFD operation. The device may transmit a PRACH preamble on the determined PRACH occasion.

Systems, methods, and instrumentalities are disclosed herein associated with timing alignment in duplex. A wireless transmit / receive unit (WTRU) may be configured to determine a guard time period. The WTRU may receive information related to a grant allocation. The grant allocation may begin at a time associated with a number of starting symbol(s) within a subband. The WTRU may determine that the time associated with the number of starting symbol(s) is within the guard time period. The WTRU may calculate the difference between the time associated with the number of starting symbols and the start time of the guard time period. The WTRU may determine to puncture a part of the transmission that uses the grant allocation based on the size of the difference between the time associated with number of starting symbol(s) and the start time of the guard time period.

Methods and systems for low earth orbit satellite communications, utilizing fractionated satellites and constellations with large baselines. The latter, combined with spatial multiplexing protocols, provides access to user equipment on the ground with much greater spatial resolution than hitherto possible. Methods include overcoming the problem posed by the round-trip delay of satellite links when adaptive, downlink, beamforming is attempted in Frequency Division Duplex (FDD) systems. Methods include using of uplink and downlink pilot signals which eliminate the need for controlling the physical integrity of the fractionated satellite through an electromechanical servo-control system in space.

A radio frequency module and a communication device capable of further suppressing a decrease in reception sensitivity are provided. A radio frequency module includes a switch (second switch), a reception filter (second reception filter), a low-noise amplifier (second low-noise amplifier), and a filter (second filter). The switch is configured to change over between a transmission path of a transmission signal and a reception path of a reception signal in communication based on a time division duplex system. The reception filter is provided at a subsequent stage of the switch and is configured to pass the reception signal in a predetermined frequency band. The low-noise amplifier is configured to amplify the reception signal that has passed through the reception filter. The filter is provided at a preceding stage of the switch in the reception path (second reception path).

Embodiments of the present disclosure relate to methods and apparatuses for configured grant (CG) configuration in a full duplex (FD) system. According to some embodiments of the present disclosure, a user equipment (UE) may include: a transceiver configured to receive a first CG configuration for an uplink (UL) bandwidth part (BWP); and receive a second CG configuration for a UL subband, wherein the first CG configuration and the second CG configuration are received in first signaling; or wherein the first CG configuration is received in second signaling and the second CG configuration is received in third signaling different from the second signaling; and a processor coupled to the transceiver.

The invention discloses an implementation method suitable for a high-throughput satellite communication hybrid duplex system. The method comprises the following steps: acquiring dual-network statistical basic data including end station back-and-forth propagation time delay distribution and phased-array antenna receiving and transmitting switching characteristics; constructing a dual coupling time planning mathematical model taking starting and ending moments of time windows of an original network and a mirror image network as optimization variables, and solving an optimal time parameter under the condition of satisfying physical constraints such as time delay accessibility, antenna switching safety and master station receiving zero overlap; and the master station broadcasts a time slot configuration instruction to cooperatively control the end stations of the whole network to execute hybrid duplex transceiving. A closed-loop feedback mechanism based on local observation of an end station is also introduced, and time delay drift is estimated and model input is corrected by using network clock reference information. According to the method, static configuration is converted into dynamic mathematical optimization solution, zero-conflict hybrid duplex communication under complex physical constraints is achieved, and the satellite spectrum resource utilization rate and the system operation stability are improved.

Embodiments of the present disclosure relate to methods and apparatuses for downlink (DL) transmission in a full duplex (FD) system. According to some embodiments of the present disclosure, a user equipment (UE) may include: a transceiver configured to receive configuration information which configures at least one subband; and a processor coupled to the transceiver and configured to determine, based on an indication, an active subband from the at least one subband for physical downlink shared channel (PDSCH) rate match or for uplink (UL) transmission or that none of the at least one subband is activated for PDSCH rate match.

The present application relates to a method and an apparatus for subband utilization in full duplex system. The method includes: determining, by a UE, at least one subband, wherein the at least one subband is associated with a first BWP; and transmitting, by the UE, an uplink signal in the at least one subband in a first set of time domain resources.

Methods and apparatuses for transmission timing in full-duplex wireless communication systems. A method for transmitting an uplink (UL) signal or channel associated with a transmission timing procedure includes receiving first information for first parameters of a first transmission timing configuration associated with a first subset of slots from a set of slots on a cell, second information for second parameters of a second transmission timing configuration associated with a second subset of slots from the set of slots on the cell, and third information for a condition. The method further includes determining whether the condition is valid for transmission in a slot from the second subset of slots and transmitting the UL signal or channel in the slot based on the first transmission timing configuration when the condition is valid and the second transmission timing configuration when the condition is not valid.

The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. Apparatuses and methods for dormancy indication in full-duplex (FD) systems. A method for a user equipment (UE) to receive physical downlink control channels (PDCCHs) includes receiving a set of carrier aggregation (CA) parameters for a serving cell associated with a subband full-duplex (SBFD) configuration on the serving cell and receiving a first PDCCH that provides a downlink control information (DCI) format. The DCI format includes a secondary cell (SCell) dormancy indication enabling or disabling receptions of a second PDCCH, in a downlink (DL) bandwidth part (BWP) associated with a group of configured SCells, for a symbol or a subband type. The method further includes selecting, based on the SCell dormancy indication, the symbol or the subband type for receptions of the second PDCCHs on an SCell in the group of configured SCells and receiving the second PDCCH in the BWP of the SCell at a first occasion.

Described herein are technologies that coordinate operation of access nodes in a communications system to enable the efficient use of TDD systems (e.g., cellular equipment) in an FDD network (e.g., a satellite network). Two access nodes can be configured with complementary schedules so that the forward link slots of a first access node correspond to the return link slots of a second access node and vice versa. In this arrangement, all time slots of a satellite network are utilized except for a switching time gap. Advantageously, although the cellular equipment implements TDD schemes, coordinated operation of the access nodes allows the satellite network to operate in full duplex and the duration of a switching time gap in the schedules can be made relatively small. That is, the switching time gap is not influenced by the propagation delay of the signal through the satellite network.

Methods and apparatuses for transmissions and receptions in full-duplex systems. A method of operating a user equipment (UE) includes receiving a first candidate subband full-duplex (SBFD) configuration associated with a first transmission configuration indicator (TCI) state configuration on a cell; receiving a second candidate SBFD configuration associated with a second TCI state configuration on the cell; and identifying a TCI state code point. The method further includes selecting (i) the first candidate SBFD configuration when a value of the TCI state code point is associated with the first TCI state configuration or (ii) the second candidate SBFD configuration when the value of the TCI state code point is associated with the second TCI state configuration and receiving or transmitting a channel or signal based on the selected SBFD configuration.

The application discloses a self-interference cancellation device in a full duplex system, which is an independently deployable hardware module connected between a radio frequency transceiver and an antenna, and comprises a switch matrix and a phase shift network unit, a control signal unit, an interface unit and a power supply unit. The switch matrix and the phase shift network unit comprise a radio frequency switch matrix and an inverter composed of a balun transformer; the control signal unit comprises a microcontroller. The microcontroller is configured to output a periodic control signal to synchronously control the radio frequency switch matrix to alternately switch the connection between the two antennas and the transmitting and receiving ports in the first half cycle and the second half cycle in a control period, and synchronously control the phase shift network to introduce a 180-degree fixed phase shift in the second half cycle. Through the above operation, the self-interference signal spectrum is moved away from the baseband, and then low-pass filtering is performed on the latter stage to realize endogenous elimination. The application does not need channel estimation, has simple hardware architecture, low cost and good compatibility, and is convenient for full duplex upgrading of existing equipment.

The application discloses an implementation method suitable for a high-throughput satellite communication hybrid duplex system, which acquires double-network statistical basic data containing end station round-trip propagation delay distribution and phased array antenna transmission-reception switching characteristics; constructs a dual-coupling time planning mathematical model with original network and mirror network time window start and end time as optimization variables, and solves optimal time parameters under the conditions of satisfying physical constraints such as delay reachability, antenna switching safety and main station reception zero overlap; and the main station broadcasts time slot configuration instructions to cooperatively control all network end stations to perform hybrid duplex transmission-reception. The application also introduces a closed-loop feedback mechanism based on end station local observation, estimates delay drift by using network clock reference information, and corrects model input. The application realizes zero conflict hybrid duplex communication under complex physical constraints by converting static configuration into dynamic mathematical optimization solution, and improves satellite spectrum resource utilization rate and system operation stability.

Apparatuses and methods for uplink transmission in full-duplex systems. A method of operating a user equipment (UE) includes receiving first information for a first set of parameters of a physical uplink control channel (PUCCH) associated with a first subset of slots from a set of slots on a cell and second information for a second set of parameters of the PUCCH associated with a second subset of slots from the set of slots on the cell. The method further includes determining, based on whether a slot is from the first subset of slots or the second subset of slots, a set of PUCCH parameters from the first and second sets of parameters and transmitting, based on the set of PUCCH parameters, the PUCCH in the slot on the cell. Slots from the first subset of slots do not include time-domain resources indicated for simultaneous transmissions and receptions on the cell. Slots from the second subset of slots include time-domain resources indicated for simultaneous transmission and reception on the cell.

Provided are a wired transmission time division duplex system and a node device thereof. The node device comprises a receiver configured to receive a data frame; a transmitter configured to send a processed data frame; a frame header detection circuit configured to identify a frame header and a preamble in a non-return-to-zero coding format from the data frame based on a specific code sequence, and obtain frame header information accordingly, and detect a level jump edge in the frame header and the preamble, and output a reference clock signal based on the detection result; and a clock and data recovery circuit configured to map a multi-level digital signal of a data segment after the frame header and the preamble into binary data bits using a corresponding pulse amplitude modulation format based on the frame header information, and recover a local receiving clock based on the reference clock signal. The slave node device effectively overcomes the synchronization difficulty and slow clock recovery in a multi-level pulse amplitude modulation system.

Described herein are technologies that utilize full duplex gateway terminals in satellite networks with half duplex user equipment. The disclosed scheduling technologies incorporate the knowledge of the propagation delay between a gateway terminal and each UE in communication with the gateway terminal. Based on this propagation delay, a scheduler can allocate DL and UL time slots in a scheduling frame in a way that avoids allocating overlapping DL and UL time slots at each UE.

Apparatuses and methods for user equipment (UE) power class fallback in full-duplex (FD) systems. A method for operating a user equipment (UE) includes receiving information for an uplink (UL) transmission and a downlink (DL) reception on a cell and determining, based on the information, first and second UE maximum output powers for an UL transmission bandwidth according to first and second UE power classes associated with the UL transmission in first and second subsets of slots, respectively, from a set of slots on the cell. The method further includes determining first and second UL transmit powers based on the first and second UE maximum output powers, respectively and transmitting, based on first or second UL transmit power, an UL signal or channel in the first subset of slots or in the second subset of slots, respectively.