217 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 apparatus may be a network node configured to transmit, to a backscatter-capable device, a first indication of a first frequency range associated with a downlink (DL) transmission, a second indication of a second frequency range associated with an uplink (UL) communication from the backscatter-capable device, and a third indication of a third frequency range associated with an UL trigger from the backscatter-capable device. The apparatus may further be configured to receive, via the third frequency range, the UL trigger indicating that the backscatter-capable device has information to transmit. The apparatus may also be configured to transmit, based on receiving the UL trigger and via the first frequency range, a CW DL transmission for backscattering from the backscatter-capable device and receive, via the second frequency range, the information from the backscatter-capable device via the CW DL transmission backscattered by the backscatter-capable device.

The present disclosure relates to a method for operating a base station in a wireless communication system. The method comprises the steps in which the base station: performs a radio resource control (RRC) connection establishment procedure with a terminal via a reconfigurable intelligent surface; estimates uplink channel state information on the basis of a reference signal received from the terminal; receives downlink channel state information from the terminal; determines an uplink precoder, a downlink precoder, and an RIS reflection pattern related to data transmission and reception on the basis of the uplink channel state information and the downlink channel state information; and transmits the determined RIS reflection pattern to the RIS and transmits the uplink precoder to the terminal.

The invention provides a lattice public key encryption method and device based on super-large-scale MIMO. The method is composed of a physical layer public key encryption part and a private key decryption part. And the base station completes encryption and SVD precoding operation by combining the channel matrix and the public key. And the legal user side completes key generation and decryption operation. The legal user side generates a private key based on the orthogonal basis of the lattice; and based on the private key and the orthogonal basis, carrying out nearest plane algorithm operation on the noisy encrypted information, and finally realizing decryption. When the number of antennas of an eavesdropper is infinite and far larger than the number of legal antennas, and the distance between the eavesdropper and a legal end is smaller than one half of the wavelength, or when the eavesdropper and the legal end directly break through the channel estimation process to obtain legal channel information, the method is safe. The method can be simultaneously suitable for time division duplex and frequency division duplex channels, does not need to depend on channel reciprocity, is based on lattice cryptography, can resist currently known quantum attacks, and meets the requirement of future 6G for communication security.

Various solutions for half-duplex-frequency division duplex (HD-FDD) mode switch with respect to user equipment and network apparatus in mobile communications are described. An apparatus may report a capability of supporting full-duplex-frequency division duplex (FD-FDD) to a network node. The apparatus may receive a configuration from the network node configuring an operation mode. The apparatus may operate in an HD-FDD mode in an event that the configuration configures the HD-FDD mode. The apparatus may operate in an FD-FDD mode in an event that the configuration configures the FD-FDD mode.

The apparatus may be a network node configured to transmit, to a backscatter-capable device, a first indication of a first frequency range associated with a downlink (DL) transmission, a second indication of a second frequency range associated with an uplink (UL) communication from the backscatter-capable device, and a third indication of a third frequency range associated with an UL trigger from the backscatter-capable device. The apparatus may further be configured to receive, via the third frequency range, the UL trigger indicating that the backscatter-capable device has information to transmit. The apparatus may also be configured to transmit, based on receiving the UL trigger and via the first frequency range, a CW DL transmission for backscattering from the backscatter-capable device and receive, via the second frequency range, the information from the backscatter-capable device via the CW DL transmission backscattered by the backscatter-capable device.

A method and an apparatus for self-interference cancellation in a communication device. The communication device includes an antenna configured to transmit a transmit signal and receive a receive signal through a duplexer in FDD communications, a first analog to digital converter (ADC) configured to convert the receive signal from analog to digital, a coupler configured to couple a sample of the transmit signal to a second ADC, which is configured to convert the sample of the transmit signal from analog to digital, and self-interference cancellation circuitry configured to process the digital sample of the transmit signal to generate a self-interference cancellation signal and apply the self-interference cancellation signal to the digital receive signal to cancel an amount of interference induced in the receive signal by the transmit signal. The SIC process provides additional isolation between TX signal and RX signal. The additional isolation could be utilized to relief the isolation requirement for the duplexer, reducing the cost and form factor of the duplexer.

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).

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.

According to aspects herein, methods and systems for providing multiple channel bundling for mobile phone satellite cellular systems are provided. More particularly, after a node comprising at last one time division duplex (TDD) layer and a frequency division duplex (FDD) layer determines a user equipment (UE) supports dual bands, the node initiates bundling of downlink communications over the FDD layer and a portion of the TDD layer. Additionally, the node instructs the UE to communicate uplink communications over the FDD layer and not uplink slots of the TDD layer. In this way, link budget is improved because only low band (FDD) is utilized in uplink communications from the UE to the node. Moreover, additional bandwidth is provided in downlink communications from the node to the UE because low band is bundled with the downlink slots of mid band (TDD).

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.

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.

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.

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.

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.

The invention provides a channel state information acquisition method, a channel state information generation method, a channel state information acquisition device, a channel state information generation device and network equipment. The method comprises the following steps: acquiring a first signal; under the condition that the duplex mode of the first signal is FDD, inputting the first input signal into a processing module, performing data processing by the processing module according to the first input signal, and outputting predicted downlink channel state information of the terminal; under the condition that the duplex mode of the first signal is TDD, inputting a second input signal into a first module in the signal processing module, performing data processing by the first module according to the second input signal, and outputting predicted downlink channel state information of the terminal; with the adoption of the method, a set of processing module obtained through model training is utilized, so that CSI acquisition of signals with FDD (Frequency Division Duplexing) as a duplex mode can be realized, and CSI acquisition of signals with TDD (Time Division Duplexing) as a duplex mode can also be realized.