32 results about "Frequency division duplex" patented technology

Embodiments of this application provide a channel information obtaining method and an apparatus. The method includes: obtaining a frequency division duplex FDD downlink channel and a time division duplex TDD channel; determining a first channel expression (I) based on the FDD downlink channel and the TDD channel; performing inverse discrete Fourier transform IDFT on the first channel expression (I) to obtain a second channel expression (II); and sending first information based on the second channel expression (II). According to the foregoing method, channel estimation quality can be improved.

Provided are a method and apparatus for reporting UE capability in a wireless communication system, and an operation method of a UE in the wireless communication system includes receiving a UE capability inquiry message including information about a new radio (NR) frequency band from a BS, generating UE capability information by considering an additional UE capability supported for a supplementary uplink (SUL) as being equal to an additional UE capability supported for frequency division duplex (FDD) when the information about the NR frequency band includes information about a frequency band related to the SUL and the UE supports the frequency band related to the SUL, and transmitting the generated UE capability information to the BS.

Provided is a terminal that performs communication in a non-terrestrial network and has limited terminal capability pertaining to half-duplex frequency division duplex, the terminal comprising: a reception unit that receives, from a base station, configuration information including information pertaining to downlink data reception timing that overlaps with uplink data transmission timing; and a control unit that sets the downlink data reception timing on the basis of the configuration information.

Systems and methods for antenna calibration of transmit chains in a base station are described. In particular, the method includes determining, by a controller, that user data transmission is initiated in an operating phase of the base station. A need for calibration of a plurality of transmit chains in the base station is determined. In response to the determination, the method includes detecting an arrival of at least one of a guard period of a special time slot in a Time-Division Duplex (TDD) radio frame, and an Orthogonal Frequency-Division Multiplexing (OFDM) symbol allocated by one or more higher layers in a Frequency Division Duplex (FDD) radio frame. The method includes performing fine-tuned calibration of each of the plurality of transmit chains based on the detection.

A radio frequency module includes a transmit amplifier configured to amplify a transmit signal a receive amplifier configured to amplify a receive signal. The radio frequency module further includes at least one duplexer configured for operation in a frequency division duplex band having a transmit band and a receive band and further configured to filter the transmit signal to pass the transmit band and to filter the receive signal to pass the receive band. The at least one duplexer is coupled to the transmit amplifier via a first node and to the receive amplifier via a second node. A series acoustic resonator directly can be connected to the second node to increase a receive impedance of the at least one duplexer across the transmit band of the at least one duplexer.

A node configured to support a method of communicating between two nodes in the unlicensed spectrum is disclosed where a channel can be simultaneously used for downlink and uplink communication. The method performed at a node involves assessing at that node, for example, a UE, that there is a transmission to be made to a further node, for example a gNB. The first node receives an indication that communication with the further node is supported on a channel within an unlicensed spectrum using flexible frequency division duplex (FDD) techniques. The first node determines whether transmission by the further node is being made within a first portion of the channel within the unlicensed spectrum; and if so, transmits to the further node within a second portion of the channel which does not overlap with the first.

This application discloses a self-adjusting method and communication system for optimizing the coexistence of multiple communication modules in frequency division duplex mode. The method operates in a communication system with at least two communication modules. The system first operates in time-division duplex mode, acquiring communication data from at least two communication modules and establishing a benchmark comparison value for the system operating in frequency division duplex mode. The system then enters a parameter adjustment phase, acquiring the radio frequency parameters of at least two communication modules. Based on the benchmark comparison value, key performance indicators (KPIs) are periodically monitored. The frequency division duplex adjustment process is evaluated and halted based on one or more reference indicators to confirm whether the radio frequency parameters of at least two communication modules need adjustment, ultimately obtaining a set of radio frequency parameters suitable for the communication system operating in frequency division duplex mode.

The invention provides user equipment, a control method and a processing module thereof. The user equipment includes a radio frequency front end (RFFE) module and a processing module. The radio frequency front end module comprises a first transmission path and a second transmission path. The first transmission path is a time division multiplexing (TDD) path. The second transmission path is a frequency division multiplexing (FDD) path or another TDD path. The processing module is configured to control the RFFE module. The special time slot for TDD transmission on the first transmission path comprises at least one downlink symbol, at least one uplink symbol and at least one protection symbol. During the period of the protection symbol, the first transmission path is controlled to be in a TDD receiving state for executing TDD downlink transmission or in a TDD sending state for executing TDD uplink transmission.

The application discloses a kind of calculation methods of PDSCH physical bit number under frequency division duplex mode, belong to wireless network technical field, first 10 subframes of each frame is divided into 3 kinds of situations, respectively subframe 0, subframe 5 and other subframes;Then in subframe 0, subframe 5, according to the position of PDSCH resource block relative to PBCH and synchronization signal, the position of PDSCH resource block is divided into five kinds of situations;Finally, in each kind of situation, according to the different values of global MIMO configuration parameter, different PDSCH physical bit number calculation formula is designed.The application gives the closed explicit formula for calculating physical bit number based on the relationship between the parameters of physical layer and PDSCH physical bit number.

A method performed by user equipment, UE, includes receiving a DL reception and transmitting an UL transmission, wherein there is a collision between the DL reception and the UL transmission. The method also includes prioritizing for processing the DL reception or the UL transmission by applying a particular prioritization rule of a plurality of prioritization rules depending upon a type of the DL reception and / or the UL transmission. The method further includes processing the DL reception or the UL transmission in response to applying the particular prioritization rule.

The present disclosure may provide a frequency division method and a structure for a repeater system for supporting XDD in a repeater based on frequency division duplex (FDD). The repeater system includes a donor antenna, a server antenna, and a digital signal processor. The donor antenna is configured to receive a FDD downlink signal from a base transceiver station (BTS), transmit the FDD downlink signal to a first downlink path through a downlink of a donor duplexer, receive a time division duplex (TDD) downlink signal from the BTS, transmit the TDD downlink signal to a second downlink path through an uplink of the donor duplexer, receive a TDD uplink signal that has been output through a first uplink path through the donor duplexer, transmit the TDD uplink signal to the BTS, receive an FDD uplink signal, and transmit the FDD uplink signal to the BTS.

Some aspects include an apparatus, method, and computer program product for radio resource management measurement prioritization for reduced capacity (RedCap) user equipment (UE). A RedCap UE may be use Half-Duplex Frequency Division Duplex (HD-FDD) for wireless communications. When performing communications with a network, the RedCap UE may make several measurements, including Reference Signal Received Power (RSRP), Signal to Interference and Noise Ratio (SINR), and Reference Signal Received Quality (RSRQ) measurements. To obtain these measurements, the RedCap UE may measure Synchronization Signal Block (SSB), Received Signal Strength Indicator (RSSI), and / or Channel State Information Reference Signal (CSI-RS) symbols. Difficulties may arise when a RedCap UE's serving cell signal timing is not synchronized with a neighboring cell. The RedCap UE may be configured to prioritize measurements over uplink transmissions. This prioritization may also include symbol buffers so that an overlap in uplink transmissions does not occur during a measurement.

A terminal includes a communication unit configured to perform communication based on half-duplex frequency division duplex; and a control unit configured to perform a first process and a second process, the first process being performed to determine a signal to receive or a signal to transmit when a downlink signal and an uplink signal overlap in a time domain during the communication, and the second process being performed to determine the signal to transmit when a plurality of uplink signals overlap in the time domain during the communication. In this terminal, the control unit determines whether to perform the first process or the second process first, and the communication unit receives or transmits a signal that is obtained based on a result of performing at least one of the first process and the second process.

Provided in the embodiments of the present application are a communication method for a frequency division duplex system, and a communication apparatus, which can send and receive sensing signals in a downlink frequency band, thereby implementing a radar sensing function. The communication method comprises: sending a first sensing signal by means of a downlink frequency band, and then receiving a second sensing signal by means of the downlink frequency band; converting the second sensing signal into a first digital signal; and on the basis of the first digital signal, performing radar sensing.

Beamforming in radio frequency (RF) communication systems using frequency division duplexing (FDD) are provided. In certain embodiments, a front end system includes a first transmit path configured to process a first radio frequency transmit signal of a frequency band, the transmit path including a power amplifier and a transmit filter having a passband that passes an uplink frequency range of the frequency band, and a receive path configured to process a first radio frequency receive signal of the frequency band. The receive path includes a low noise amplifier, a switch, and a receive filter having a passband that passes a downlink frequency range of the frequency band, and the switch has a first state in which an input of the low noise amplifier is coupled to the receive filter and a second state in which an output of the power amplifier is coupled to the receive filter.

The present disclosure discloses a method and apparatus for determining an operating frequency band, a base station, a duplexer, and a medium. The method comprises: determining candidate frequency band information, the candidate frequency band information comprising a transmission frequency and a receiving frequency corresponding to each frequency-division duplexing (FDD) frequency band among a plurality of FDD frequency bands; determining a plurality of transmission operating frequencies and a plurality of receiving operating frequencies supported by a radio frequency front end of a base station; and, on the basis of the candidate frequency band information, determining a target operating frequency band of a duplexer matching the radio frequency front end from the plurality of transmission operating frequencies and the plurality of receiving operating frequencies, a target transmission operating frequency and a target receiving operating frequency that correspond to the target operating frequency band corresponding to different FDD frequency bands, respectively. According to the described technical solution, the degree of isolation of the duplexer matching the radio frequency front end of the base station can be improved without increasing the costs, the occupied layout area, and insertion loss.

The invention discloses a channel information compression feedback method and system based on mode-phase separation and spatial-temporal feature extraction, and the method comprises the steps: carrying out the preprocessing of uplink and downlink spatial frequency domain channel matrixes, and calculating a mode value matrix and a phase matrix of the channel matrixes; decoupling the uplink and downlink module value matrixes, extracting common information of uplink and downlink channel module values and unique information of downlink channel module values, and extracting space and time characteristics for feedback; the base station combines the module value common information and the downlink channel module value unique information to recover the downlink channel module value; module value screening is carried out, and corresponding position indexes and phases are fed back; and the base station reconstructs a downlink channel matrix by combining the downlink channel screening phase and the recovered downlink channel module value. According to the method, implicit reciprocity and time correlation of the frequency division duplex channel are fully utilized, so that a user only needs to feed back unique information of a downlink module value and a downlink main path phase, the channel feedback load is reduced, the recovery performance of channel information is improved, and the method has remarkable performance advantages.

Embodiments of the present application disclose a spectrum resource sharing method, a base station and a computer readable storage medium, which are used to improve the utilization of spectrum resources in a frequency division duplex spectrum sharing scenario. The method of the embodiments of the present application comprises the following steps: a base station acquires the number of radio resource control (RRC) connected users of an LTE cell; when the number of RRC connected users is equal to 0, the base station punches the PCFICH and PHICH occupied by the LTE system in a subframe, and maps the downlink service data of the NR system to the first target RE in the subframe, wherein the first target RE is an RE in symbol 0 of the subframe which is not occupied by the reference channel of the LTE system.

A limited-capability user equipment (RedCap UE) can decode configuration information received from a gNodeB (gNB) to configure the RedCap UE for UL sounding reference signal (UL SRS) transmission for positioning with transmit frequency hopping. The RedCap UE can determine whether to drop the UL SRS transmission based on a priority rule if any one or more symbols of the UL SRS transmission would collide with an uplink channel transmission, including a switching time for switching to or from an active bandwidth portion. If it is determined that the UL SRS transmission is to be dropped, the RedCap UE can drop one or more symbols of the UL SRS transmission that would collide and transmit any symbols of the UL SRS transmission that do not collide with the uplink channel transmission. The RedCap UE can be a half-duplex (HD) frequency division duplex (FDD) RedCap UE and can perform transmit frequency hopping over a bandwidth greater than the RedCap UE's maximum bandwidth.

A communications device operating according to a Half Duplex Frequency Division Duplex mode of operation (HD-FDD) is configured to transmit and / or receive data in a wireless communications network. The communications device is configured to receive from the wireless communications network a first allocation of first physical resources of an uplink channel of a wireless access interface provided by the wireless communications network for transmitting uplink data to the wireless communications network, and to receive from the wireless communications network a second indicator of second physical resources of a downlink channel of the wireless access interface for receiving downlink data from the wireless communications network.

The present disclosure relates to systems and methods for high power operation in a user equipment. The present disclosure generally relates to systems and methods for high power operation in a user equipment. The user equipment may indicate the high power capability of the user equipment to the network. Based on the uplink signal strength of the user equipment, the network may send a command to the user equipment to transmit using high power user equipment (HPUE) operation in a half-duplex frequency division duplex (HD-FDD) mode. The network may also send a signal for the user equipment to return to a default power mode based on the uplink signal strength. Then, the user equipment may be reconfigured to the default power in a full-duplex frequency division duplex (FD-FDD) mode. The user equipment may also send an indication of an uplink duty cycle, which indicates a ratio of an uplink allocation corresponding to an uplink transmission to all uplink allocations and downlink allocations.

The embodiment of the invention provides a communication method and a communication device of a frequency division duplex system, which can send and receive a sensing signal in a downlink frequency band so as to realize a radar sensing function. The communication method comprises the steps that after a first sensing signal is sent through a downlink frequency band, a second sensing signal is received through the downlink frequency band, the second sensing signal is converted into a first digital signal, and radar sensing is carried out according to the first digital signal.

In general, various aspects of the present disclosure relate to wireless communications. In some aspects, a user equipment (UE) may transmit an indication of one or more handover options supported by the UE, where the one or more handover options are associated with performing an uplink transmit handover for a first frequency band and a second frequency band. Wherein at least one of the first frequency band or the second frequency band is a frequency division duplex frequency band, a time division duplex frequency band, or a supplementary uplink frequency band. Uplink multiple input multiple output is allowed on the first frequency band and the second frequency band. The UE may receive information associated with an uplink transmission scheduled for the UE after sending an indication of the one or more handover options, where the uplink transmission is scheduled according to the one or more handover options supported by the UE. Various other aspects are provided.

A user equipment (UE) is configured to determine that half-duplex frequency division duplex (HD-FDD) is enabled by a network with which the UE is communicating, identify a collision between a cell-specific downlink reception and a cell-specific uplink transmission and implement a HD-FDD collision handling technique. A UE may also be configured to determine that half-duplex frequency division duplex (HD-FDD) is enabled by a network with which the UE is communicating, perform a first cell-specific uplink transmission at a first time and perform a first cell-specific downlink reception at a second time, wherein a guard period represents a time duration between the first time and the second time during which the UE is not to perform a second different cell-specific uplink transmission or a second different cell-specific downlink reception.

Disclosed are methods, systems, and computer-readable medium to perform operations including: determining a scheduling conflict between an uplink transmission and a downlink reception; determining a type of the scheduling conflict; and applying, based on in part on the type of the scheduling conflict, a prioritization rule that prioritizes at least a portion of the uplink transmission or the downlink reception in order to mitigate the scheduling conflict.

A method performed by user equipment, UE, includes receiving a DL reception and transmitting an UL transmission, wherein there is a collision between the DL reception and the UL transmission. The method also includes prioritizing for processing the DL reception or the UL transmission by applying a particular prioritization rule of a plurality of prioritization rules depending upon a type of the DL reception and / or the UL transmission. The method further includes processing the DL reception or the UL transmission in response to applying the particular prioritization rule.

Methods, systems, and computer-readable media for performing operations including determining a scheduling conflict between an uplink transmission and a downlink reception, determining a type of the scheduling conflict, and applying a prioritization rule based in part on the type of the scheduling conflict that prioritizes at least a portion of the uplink transmission or the downlink reception in order to mitigate the scheduling conflict are disclosed.

To provide a transmission processing method for simultaneously satisfying demands of a half-duplex frequency division duplex (FDD) terminal and a full-duplex FDD terminal.SOLUTION: In a communication system, a method used for a terminal performs at least one process of discarding an uplink transmission in a resource set corresponding to an uplink transmission before an uplink-downlink switching and discarding a transmission in a resource set corresponding to the uplink transmission after the uplink-downlink switching in the case where a position interval between an end position of a resource set corresponding to the uplink transmission before the uplink-downlink switching and a start position of the resource set corresponding to the downlink operation after the uplink-downlink switching is smaller than an uplink-downlink switching time, or a position interval between the end position of the resource set corresponding to the downlink operation before uplink-downlink switching and the start position of the resource set corresponding to the uplink transmission after the uplink-downlink switching is smaller than the link switching time.SELECTED DRAWING: Figure 2

A method (1000) by a user equipment, UE, (412A-D) for adapting a small data transmission, SDT, includes determining (1002) that at least one proximity condition is fulfilled. The at least one proximity condition is associated with at least one resource for a SDT and at least one paging resource for receiving at least one paging related signal from a network node. The UE performs (1004) at least one task for adapting the SDT based on the at least one proximity condition being fulfilled.

The flexible and unified frame structure is applicable to a time division duplex operation mode, a frequency division duplex operation mode and a full duplex operation mode of a next generation wireless network. These frame structures may be implemented on low cost devices to receive and transmit traffic in perception-related and communication-related applications by considering a simplified configuration in combination with network power saving and user equipment power saving.