125 results about "Frequency division duplexing" patented technology

Systems, methods, and instrumentalities are described herein for joint transmission (JT) channel state information (CSI) reporting. Joint transmission CSI may be coherent JT CSI or non-coherent JT CSI. Feedback overhead may be reduced, for example, if reporting CSI for multiple transmission / reception points (TRPs). Precoding matrix indicators (PMIs) and / or co-phasing information for TRPs in JT (e.g., coherent JT or non-coherent JT) may be reported. A wireless transmit / receive unit (WTRU) may be configured to employ operations to reduce feedback overhead and / or report PMIs and / or co-phasing information for TRPs in JT.

Embodiments of the present disclosure relate to devices, methods, apparatuses and computer readable storage media of resource allocation for time-division or frequency-division duplexing communication. The method comprising: receiving, at a first device and from a second device, first configuration information indicating a set of resources for time-division or frequency-division duplexing communication between the first device and the second device, the set of resources comprising a first subset of the resources for uplink transmission; and receiving, from the second device, second configuration information indicating at least one second subset of the resources for the uplink transmission, the at least one second subset of the resources comprising at least one resource other than the first subset of the resources.

The invention provides a channel state information feedback enhancement method and system based on bidirectional channel correlation, and the method is executed at a base station end, and comprises the steps: receiving a downlink channel state information semantic vector which is coded, compressed and quantized by a user end through a deep joint source channel; carrying out inverse quantization on the semantic vector to obtain an intermediate semantic vector; based on the intermediate semantic vector, retrieving a related historical uplink semantic vector from an uplink channel semantic knowledge base; performing fusion enhancement on the intermediate semantic vector and the retrieval result through an attention mechanism to generate an enhanced semantic vector; inputting the enhanced semantic vector into a decoder, and outputting a reconstructed downlink channel state information matrix; wherein the encoder, the enhancement module and the decoder perform end-to-end joint training optimization by minimizing a reconstruction error. According to the method, the semantics is enhanced at the receiving end by utilizing the correlation of the uplink and downlink channels, the feedback precision and the system robustness are remarkably improved, and the method is suitable for a frequency division duplex system.

Methods, systems, and devices for wireless communication are described. Various aspects relate to signaling mechanisms according to which a user equipment (UE) and a network entity may coordinate on interruptions of downlink signaling, including interruptions associated with a temporary switch, at the UE, from a first carrier associated with a frequency division duplexing (FDD) communication scheme to a second carrier associated with a time division duplexing (TDD) communication scheme. In some examples, the UE may transmit, to the network entity, control signaling that includes an information element. The information element may include a first indication of an interruption of downlink signaling via the first carrier and a second indication of a duration of the interruption. In accordance with providing the first and second indications to the network entity, the UE may transmit uplink signaling via the second carrier within the duration of the interruption.

The invention provides a near-field beam training method and device for a super-large-scale array based on an energy diffusion effect, a storage medium and electronic equipment, and relates to the technical field of near-field communication. The method can be applied to three array structures of ULA, UCA and UPA. The method comprises the following steps: firstly, constructing a downlink frequency division duplex communication system, and uniformly modeling near-field super-large-scale channels of three array structures into a function related to a wave path difference; and secondly, a new codebook design criterion is formulated, and an optimal focus point is obtained by maximizing an overlapping range of a near-field region and a beam direction and utilizing an energy diffusion effect, so that the gain of the beam in a coverage blind area is improved. And finally, based on the codebook design criterion, obtaining a two-stage codebook structure and a corresponding beam training scheme. The designed near-field codebook structure is applied to a corresponding beam training scheme, the training overhead can be balanced, and a blind area in an angle training stage can be effectively repaired, so that the beam training precision is improved.

This application describes mechanisms to manage closed-loop antenna selection for a wireless device. The wireless device transmits sounding reference signal (SRS) resources configured by a cellular wireless network in an SRS resource set and receive SRS indicator (SRI) values to indicate antennas for subsequent uplink transmission of one or more physical layer channels by the wireless device, including a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), and a physical random access channel (PRACH). The wireless device supplements the closed-loop antenna selection with an open-loop antenna selection and uses the open-loop antenna selection for non-PUSCH channels when a most recently SRI value can be considered stale. SRI-based closed-loop antenna selection is extended to frequency division duplexing (FDD) bands. Transmit precoding matrix indicator (TPMI) group values are also used to indicate differential transmit power capabilities of various antennas of the wireless device to the cellular wireless network.

The present application relates to improve the data communications between a user equipment (UE) and a base station. In an example, the UE can indicate, to the base station, its support of pairing an uplink band with a downlink band to define a frequency division duplex (FDD) band. The uplink band can belong to a first frequency band, whereas the downlink band can belong to a second frequency band. The base station can configure the FDD band for the UE in association with a cell. Data communications can accordingly be performed using FDD.

The invention discloses a large-scale MIMO hybrid beam forming method capable of learning a multi-scale network, and belongs to the technical field of hybrid beam forming. The invention provides a learnable multi-scale hybrid beam forming network based on a frequency division duplex system, and an enhanced multi-channel convolution attention module and a learnable channel enhancement network are jointly designed. The EMCAM introduces multi-scale feature extraction and a dual-channel attention mechanism into a channel estimation and feedback link, so that the robustness of the system under the conditions of low signal-to-noise ratio and limited pilot frequency is remarkably improved, and CSI representation has higher robustness and compressibility under noise disturbance. The LCEN projects an antenna domain channel to an angular domain representation with higher sparsity by using a predefined angular domain mapping matrix, and applies complex rotation to an angular domain coefficient through a phase combination generated by the network; and the obtained equivalent channel has stronger directional energy aggregation and higher feature distinguishability, so that the robustness and prediction performance of the downstream HB under a limited feedback condition are improved.

The mobile terminal provided in this application includes a first antenna system, a second antenna system, a first radiator, and a second radiator. The tuning circuit of the first antenna system is coupled to the first radiator, and the tuning circuit of the second antenna system is coupled to the second radiator. When the second antenna system is in a transmit or receive time slot, by matching the tuning states of the tuning circuits of the first and second antenna systems, the first and second radiators can jointly excite and generate signals in the transmit or receive frequency bands of the second antenna system. Therefore, the antenna system design of the mobile terminal provided in this application utilizes the mutual assistance between the two antenna systems to improve the performance of the antenna system that simultaneously supports frequency division duplexing and time division duplexing, which is beneficial for enhancing the communication performance of the mobile terminal.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive first configuration information indicating a transmission time interval (TTI) bundling resource. The UE may receive second configuration information indicating semi-persistent scheduling (SPS) resources. The UE may detect, during a communication session, an SPS trigger for using the SPS resources in a subframe that is misaligned with a periodicity associated with the TTI bundling resource. The UE may determine whether the SPS trigger is valid based at least in part on a number of TTI bundling grants subsequent to the detection of the SPS trigger that are misaligned with the subframe associated with the SPS trigger. Numerous other aspects are provided.

Methods, systems, and devices for wireless communication are described. Various aspects relate to signaling mechanisms according to which a user equipment (UE) and a network entity may coordinate on interruptions of downlink signaling, including interruptions associated with a temporary switch, at the UE, from a first carrier associated with a frequency division duplexing (FDD) communication scheme to a second carrier associated with a time division duplexing (TDD) communication scheme. In some examples, the UE may transmit, to the network entity, control signaling that includes an information element. The information element may include a first indication of an interruption of downlink signaling via the first carrier and a second indication of a duration of the interruption. In accordance with providing the first and second indications to the network entity, the UE may transmit uplink signaling via the second carrier within the duration of the interruption.

A communication method and apparatus, belonging to the field of communications, in the method, a first network device acquires a first time-frequency resource, the first time-frequency resource comprising a time-frequency resource for uplink communication and / or downlink communication in a frequency division duplex (FDD) system; and the first network device performs a sensing operation by using the first time-frequency resource. Based on the method, in a frequency division duplex system, network equipment can respectively perform uplink transmission and downlink transmission on the same time domain resource by using different frequency domain resources. Based on the characteristic of the frequency division duplex system, the network device can still use the time-frequency resource for downlink communication to transmit downlink data when multiplexing the time-frequency resource for uplink communication for sensing, or the network device can still use the time-frequency resource for downlink communication to transmit downlink data when multiplexing the time-frequency resource for downlink communication for sensing. According to the method, the time-frequency resource for uplink communication can still be used for transmitting uplink data, so that the problem of communication interruption caused by sensing can be avoided, and the reliability of communication and sensing is improved.

A multi-carrier transmission system configured to enable variable modulation order reception is contemplated. The system may be configured to facilitate delivery of high-speed data (HSD) over frequency division duplexing (FDD) and / or time division duplexing (TDD) infrastructures to a plurality of receiving devices. Signaling used to facilitate delivery of the HSD may be selectively and dynamically modulated according to performance capabilities of the receiving devices for a given transmission interval.

A method of downlink channel state information (DL CSI) measurement and reporting is proposed in FR1 frequency division duplex (FDD) systems. CSI reference signal (CSI-RS) is directed towards dominant spatial domain (SD, beam) and frequency domain (FD, delay) components in the propagation environment. By partial channel reciprocity, angles and delays in the DL channel can be obtained by UL channel measurement. UE only needs to measure and feedback the DL CSI corresponding to the dominant angles and delays. BS obtains the precoder in the antenna-frequency domain using the CSI feedback in the beam-delay domain. BS uses the precoder for transmission over Physical downlink shared channel (PDSCH). In one embodiment, UE reconstructs the DL channel on a multitude of delays using the DL channel estimated on a few beamformed CSI-RS and delay tap indices signaled from the network.

The disclosure relates to a method and apparatus for transmitting and receiving a signal in a wireless communication system. An operation method of a terminal in a wireless communication system includes receiving, from a base station, information related to a position of a symbol in which a synchronization signal block is transmitted in a time domain, determining whether a position of a symbol configured to transmit an uplink signal overlaps with the position of the symbol in which the synchronization signal block is transmitted in the time domain, in a case where the position of the symbol configured to transmit the uplink signal overlaps with the position of the symbol in which the synchronization signal block is transmitted in the time domain, determining whether a time or frequency division duplex (XDD) related indicator is configured or received, and transmitting, to the base station, the uplink signal based on a result of the determination of whether the XDD related indicator is configured or received.

Methods and apparatuses are provided for managing transitions between sub-band frequency division duplex (SBFD) and non-SBFD modes in full duplex communication systems. A RACH occasion is configured spanning across a SBFD symbol, a subsequent non-SBFD symbol, and a period between the symbols for transitioning between SBFD communications and non-SBFD communications. A wireless device may determine whether a UE is to switch from a first uplink configuration associated with SBFD communications to a second uplink configuration associated with non-SBFD communications during a configuration transition period. The device may communicate a RACH preamble before, during, or after the switch. A timing of the configuration transition period may be based on scheduling restrictions, reported UE capabilities, determined guard symbol lengths, or configured SBFD or non-SBFD modes for RACH occasions. Thus, uninterrupted PRACH transmission across SBFD and non-SBFD symbols may be achieved, enhancing the efficiency of data communication in full duplex systems.

The present disclosure provides a system and a method for automatic topographic interference detection and mitigation based on network data. The system identifies aggressor / source cells from base stations based on various parameters. The system groups the source cells into a high, a medium, and a low state, and applies a radio frequency (RF) tilt and associated power attenuation on the frequency division duplex (FDD) and the time division duplex (TDD) cells of multiple regions for a predetermined period. The system predicts interferences associated with the source cells based on the parameters. Further, the system dynamically updates the RF tilt and the associated power attenuation for the predetermined period. The system determines a decrease in the automatic topographic interference and reverts the RF tilt and the associated power attenuation for the source cells.

A frequency division duplex (FDD) first band includes a first downlink operating band and a first uplink operating band. An FDD second band includes a second downlink operating band and a second uplink operating band. In the FDD first band and the FDD second band, (1) the first downlink operating band, second downlink operating band, first uplink operating band, and second uplink operating band are positioned in order from lowest to highest frequency. The frequency range of the first uplink operating band and that of the second uplink operating band do not overlap each other. A filter is formed in or on a first substrate having piezoelectric properties and has a pass band including the first and second uplink operating bands.

Methods, systems, and devices for wireless communication are described. Various aspects relate to signaling mechanisms according to which a user equipment (UE) and a network entity may coordinate on interruptions of downlink signaling, including interruptions associated with a temporary switch, at the UE, from a first carrier associated with a frequency division duplexing (FDD) communication scheme to a second carrier associated with a time division duplexing (TDD) communication scheme. In some examples, the UE may transmit, to the network entity, control signaling that includes an information element. The information element may include a first indication of an interruption of downlink signaling via the first carrier and a second indication of a duration of the interruption. In accordance with providing the first and second indications to the network entity, the UE may transmit uplink signaling via the second carrier within the duration of the interruption.

The invention discloses a bridge-based frequency division duplex balanced low noise amplifier and a radio frequency receiver, comprising a bridge A and a bridge B. The bridge A and the bridge B are both dual-frequency bridges, a port P1 of the bridge A receives signals, a port P4 of the bridge A is connected with a load, a port P2 and a port P3 are respectively connected with an input end of the low noise amplifier, and a port P2 and a port P4 of the bridge B are respectively connected with an output end of the low noise amplifier. The output end of the low noise amplifier is respectively connected with a port P5 and a port P8 of the bridge B, a port P6 outputs a frequency f1 signal, a port P7 can output a frequency f2 signal, or the port P6 outputs the frequency f2 signal, and the port P7 outputs the frequency f1 signal; the output ports of the bridge A are opposite in phase, and the output ports of the bridge B are the same in phase; and the duplex effect is realized under the working of the two bridges. Compared with the design of a traditional balanced duplex low-noise amplifier, an additional traditional duplexer is not needed to realize a duplex function, so that the system integration level is improved, the component cost is reduced, and the system performance is improved.

Aspects relate to an integrated access backhaul (IAB) - distributed unit (DU) resource configuration framework for paired (e.g., frequency division duplex (FDD)) spectrum. For paired spectrum, two DU resource configurations per cell can be supported, including one for a first spectrum band (e.g., downlink band) of the paired spectrum and another for a second spectrum band (e.g., uplink band) of the paired spectrum. Each DU resource configuration can include a respective symbol pattern for a plurality of slots of a symbol type (e.g., downlink (DL), uplink (UL), flexible), and a corresponding availability attribute for each symbol type (e.g., hard, soft, or unavailable). A DU of an IAB node in an IAB network can receive the two DU resource configurations for the paired spectrum from a central unit (CU) of an IAB donor node in the IAB network.

This invention discloses a bidirectional continuous-variable quantum key distribution method and system based on frequency division duplexing in a single-transceiver ring network. The method is based on a monolithically integrated silicon photonics transceiver chip. By pre-setting optical carrier frequency offsets for the forward and reverse links, it isolates the quantum signal from Rayleigh backscattering noise in the fiber in the frequency domain. The transmitting end generates a broadband waveform containing quantum signals and pilot signals, which is transmitted bidirectionally through a single optical fiber. The receiving end uses a laser source from the same chip as the local oscillator for coherent heterodyne detection. A digital signal processing module performs orthogonalization correction, phase recovery, and matched filtering to suppress noise and extract the quantum signal to generate a secure key. This invention solves the problems of inflexible networking, low fiber utilization, and severe scattering noise interference in bidirectional transmission over a single fiber caused by the separation of the transmitting and receiving ends in integrated continuous-variable quantum key distribution systems. It provides a low-cost and highly flexible solution for metropolitan quantum ring networks.

Current frame structures in Long-Term Evolution (LTE) and New Radio (NR) are not designed to accommodate full duplex (FD) communication. Embodiments are disclosed in which frame structures are provided that support FD communication and frequency division duplex (FDD) communication and time division duplex (TDD) communication. In some embodiments, there is defined two separate and independent frame structures: a frame structure for reception (e.g. a downlink frame structure) and a frame structure for transmission (e.g. an uplink frame structure).

A method of operating a wireless communication device configured to communicate with a communications network using frequency duplex transmission in an uplink frequency band and in a downlink frequency band is provided. The method includes monitoring for first downlink reference signals transmitted by an access node of the communications network in the uplink frequency band and using multiple first downlink transmit beams; and monitoring for second downlink reference signals transmitted by the access node of the communications network in the downlink frequency band and using multiple second downlink transmit beams.

Systems and methods for high power uplink transmission are disclosed. In one aspect, a mobile device includes an antenna configured to transmit radio frequency signals to a base station via an uplink and receive radio frequency signals from the base station via a downlink and a front end system coupled to the antenna. The front end system is configured to transmit and receive the radio frequency signals from the antenna, and duplex the radio frequency signals via frequency division duplexing. The front end system is further configured to transmit data on the uplink at a first power level that is higher than a predetermined level and at a finite duty cycle.

A user equipment, a controlling method and a processing module thereof are provided. The user equipment comprises 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 Duplexing (TDD) path. The second transmission path is another TDD path or a Frequency Division Duplexing (FDD) path. The processing module is configured to control the RFFE module. A special slot for a TDD transmission on the first transmission path comprises at least one downlink symbol, at least one uplink symbol and at least one guard symbol. During the guard symbol, the first transmission path is controlled to be either a TDD receiving state for executing a TDD downlink transmission or a TDD transmitting state for executing a TDD uplink transmission.

An improved multiple-input multiple-output (MIMO) solution is disclosed for customer premises equipment (CPE) in which a set of wireless interfaces (e.g., cellular and WiFi), each with a plurality of antenna ports for MIMO operation, couple to an antenna switch fabric, which is then coupled to a set of antennas. In some examples, the antennas are distributed for maximum isolation and separation in order to improve MIMO channel separation, for example in an approximately spherical arrangement. The antenna switch fabric is instructed to select the optimal antennas based on signal parameter measurements, in order to improve overall performance. Selection of uplink (transmit) versus downlink (receive) antenna sets may be independent and based on different signal parameter measurements (e.g., for frequency division duplexing, FDD).

Disclosed herein is a radio frequency (RF) unit and a method of operating the RF unit. The RF unit includes an antenna array, and the antenna array includes a plurality of antenna elements. A first group of the plurality of antenna elements is configured to operate in a first mode, and a second group of the plurality of antenna elements is configured to operate in a second mode. In the first mode, the first group of the plurality of antenna elements is configured to transmit and receive. In the second mode, the second group of the plurality of antenna elements is configured to only receive.

According to various embodiments, disclosed are a method and a device for performing a mobile terminal (MT) operation and a distributed unit (DU) operation by an IAB node in a wireless communication system in which frequency division duplex (FDD) is supported. Disclosed are the method and the device for the method, the method comprising the steps of: receiving first resource configuration information relating to the MT operation and second resource configuration information relating to the DU operation; and performing the MT operation on the basis of the first resource configuration information and performing the DU operation on the basis of the second resource configuration information, wherein, on the basis that there is no report on a multiplexing capability between the MT operation and the DU operation, the first resource configuration information and the second resource configuration information: support simultaneously performing an MT reception operation and a DU reception operation and simultaneously performing an MT transmission operation and a DU transmission operation; and prohibit to support simultaneously performing the MT transmission operation and the DU reception operation and simultaneously performing the MT reception operation and the DU transmission operation.