117 results about "Mimo transmission" patented technology

A user equipment (UE) receives control signaling for an uplink (UL) multiple input multiple output (MIMO) transmission and transmits the UL MIMO transmission precoded with an 8 port uplink MIMO precoder based on the control signaling and a set of two or more antenna port groups.

Method and apparatus for supporting simultaneous MultiUser (MU) Multiple-Input Multiple-Output (MIMO) operations utilizing Orthogonal Frequency Division Multiple Access (OFDMA) with Uplink OFDMA Random Access (UORA). Access Points (APs) trigger and obtain short PPDUs from the stations to learn spatial filtering patterns that are utilized in adjusting antenna phase differences to obtain minimum / maximum energy from this BSR. The APs determine favored and unfavored directions of communication, which are conveyed to non-AP UORA stations as channel estimation signals. The UORA stations base broadcasting on strengths of channel estimation signals to determine eligible UORA resource units. The UORA procedure to secondary APs allows a primary AP to trigger a UL-MU MIMO transmission with the number of spatial streams exceeding the number of antennas at the primary AP.

For example, an apparatus may include a baseband controller configured to control a plurality of dual-polarization Radio Heads (RHs) to communicate a Multiple-Input-Multiple-Output (MIMO) transmission, the baseband controller configured to control a first dual-polarization RH of the plurality of dual-polarization RHs to communicate a first spatial stream of the MIMO transmission with a horizontal-polarization via one or more first dual-polarization antenna elements of the first dual-polarization RH, and to control a second dual-polarization RH of the plurality of dual-polarization RHs to communicate a second spatial stream of the MIMO transmission with a vertical-polarization via one or more second dual-polarization antenna elements of the second dual-polarization RH.

A method for determining an uplink multiple input multiple output (MIMO) transmission codeword, includes: determining at least one of a candidate codeword of 4 transmit antenna ports (Tx) for uplink MIMO transmission or a candidate codeword of 2 Tx for uplink MIMO transmission; dividing 8 Tx into K antenna port groups, wherein K is a positive integer less than 8; determining a third codeword from the candidate codeword, and determining a fourth codeword corresponding to the third codeword; and obtaining a first codeword for the antenna partial coherence transmission of 8 Tx L-layer for the uplink MIMO transmission by splicing, based on the antenna port groups and a co-phasing coefficient, the third codeword and the fourth codeword, wherein L is less than or equal to 8.

A transmission method intended for an OMAMRC telecommunication system with M sources (s1, . . . , sM), possibly L relays and one destination, M≥2, L≥0. In such a solution, when a source could not be decoded by the destination, the latter organises a retransmission by taking into account the characteristics of a MIMO transmission channel established between, on the one hand, at least two nodes that decoded the source and, on the other hand, at least two antennas in reception of the destination in the form of a precoding coefficient. Thus, the method therefore makes it possible to improve the decoding performance of a source si, in a context where the destination is equipped with a plurality of antennas in reception.

Systems, methods, apparatuses, and computer program products for enabling efficient cell-free MIMO transmissions. A method may include receiving a downlink reference signal; determining at least one cell-free multiple-input multiple-output transmission policy associated with at least one access point based at least on the downlink reference signal; and transmitting at least one of the at least one cell-free multiple-input multiple-output transmission policy and enabling information to a network entity.

Systems, methods, apparatuses, and computer program products for enabling efficient cell-free MIMO transmissions. One method may include receiving a downlink reference signal, determining at least one cell-free multiple input multiple output transmission strategy associated with at least one access point based upon at least the downlink reference signal, and transmitting to a network entity at least one of the at least one cell-free multiple input multiple output transmission strategy and enabling information.

A user equipment (UE) receives control signaling for an uplink MIMO transmission, the control signaling including a first TPMI field and a second TPMI field and an SRS resource set indicator and transmits the uplink MIMO transmission precoded with an 8 port uplink MIMO precoder, the 8 port uplink MIMO precoder being based on a 4 port uplink MIMO codebook with a mapping indicated by one or more of the first TPMI field, the second TPMI field, or the SRS resource set indicator.

A method and system are disclosed for optimizing downlink multi-user multiple-input multiple-output (MU-MIMO) transmission in time division duplex (TDD) wireless communication systems. Sounding reference signals (SRS) from user equipment (UEs) are processed using a machine-learned model to extract physical-layer channel characteristics, including Doppler spread, delay profile, and signal-to-noise ratio (SNR). Based on these features, a channel state information (CSI) acquisition operation is adaptively selected for each UE—either channel estimation (CE) alone or both CE and channel prediction (CP). When CP is used, prior channel estimates are analyzed to generate predicted CSI over a future interval. The obtained CSI is then used to configure MU-MIMO transmission parameters such as beamforming weights, modulation and coding schemes (MCS), and UE grouping. This adaptive framework improves performance in time-varying and high-mobility environments by ensuring timely and reliable CSI is used for downstream transmission decisions.

Some demonstrative embodiments include apparatuses, systems and / or methods of communicating a Single-User (SU) Multiple-Input-Multiple-Output (MIMO) transmission. For example, a first wireless communication station may be configured to transmit a Request to Send (RTS) to a second wireless communication station via a plurality of SU MIMO Transmit (Tx) sectors of the first wireless communication station, the RTS to establish a Transmit Opportunity (TXOP) to transmit an SU-MIMO transmission to the second wireless communication station, a control trailer of the RTS including an indication of an intent to transmit the SU-MIMO transmission to the second wireless communication station; and to transmit the SU-MIMO transmission to the second wireless communication station, upon receipt of a Clear to Send (CTS) from the second wireless communication station indicating that the second wireless communication station is ready to receive the SU-MIMO transmission.

A method of determining a lower bound on users' speed for efficient SRS resource handling for MU-MIMO transmission includes determining an eNodeB (eNB) or gNodeB (gNB) timing of a subframe; determining a User Equipment (UE) timing of the subframe; calculating a timing advance type corresponding to a Round Trip Time (RTT); calculating a distance to a base station corresponding to the Round Trip Time (RTT); calculating a distance traveled by a UE between two points based on the distance to the base station; calculating a user speed based on the distance traveled by the UE; deriving a lower bound based on the user speed; and filtering users that exceed the lower bound on user speed. The filtered users may be not assigned SRS. The non-filtered users may be assigned SRS and may subsequently be sent MU-MIMO transmissions.

Techniques and apparatus for radio frequency (RF) exposure compliance for multiple-input, multiple-output (MIMO) transmissions are described. An example method that may be performed by a wireless device includes determining a respective multiple-input, multiple-output (MIMO) transmit power limit for each of a plurality of antennas of the wireless device. A signal associated with a MIMO transmission is transmitted from each antenna at a respective first transmission power level based on the respective MIMO transmit power limit for the antenna in compliance with a radio frequency (RF) exposure limit. The first transmission power level used for a first antenna of the plurality of antennas is different from the first transmission power level used for a second antenna of the plurality of antennas.

Some demonstrative embodiments include apparatuses, systems and / or methods of communicating a Single-User (SU) Multiple-Input-Multiple-Output (MIMO) transmission. For example, a first wireless communication station may be configured to transmit a Request to Send (RTS) to a second wireless communication station via a plurality of SU MIMO Transmit (Tx) sectors of the first wireless communication station, the RTS to establish a Transmit Opportunity (TXOP) to transmit an SU-MIMO transmission to the second wireless communication station, a control trailer of the RTS including an indication of an intent to transmit the SU-MIMO transmission to the second wireless communication station; and to transmit the SU-MIMO transmission to the second wireless communication station, upon receipt of a Clear to Send (CTS) from the second wireless communication station indicating that the second wireless communication station is ready to receive the SU-MIMO transmission.

Various aspects of the present disclosure provide systems and methods for supporting multi-layer data transmissions, aimed at enabling multiple input multiple output (MIMO) transmissions or multi-layer transmissions at an earlier point in time, for example, immediately after or during an initial access procedure. An apparatus (e.g., user equipment), in response to a request from a network device (e.g., a base station), may generate a channel state information (CSI) report based on measurements of a synchronization signal-physical broadcast channel (SS-PBCH) block (SS-PBCH block, SSB) transmitted over a plurality of antenna ports. The CSI report may include information related to a device-specific CSI and / or information indicating a sub-channel quality. The network device may send configuration information related to the CSI report, a measurement configuration of the SSB, and / or a configuration supporting early MIMO transmissions. The method shown in the present invention reduces a large delay between SSB detection and MIMO transmission during the initial access process.

An example aspect comprises selecting an azimuth mode for an OAM MIMO transmission by a transmitter that includes a first number of circles that each include a second number of antenna elements, wherein the azimuth mode defines a DFT vector of a size less than or equal to the second number; selecting, from a plurality of radial modes associated with the azimuth mode, a radial mode for the transmission, wherein the radial modes include at least a first radial mode defining a first beamforming vector and a second radial mode defining a second beamforming vector, wherein each one of the first and second beamforming vectors includes the DFT vector weighted and repeated for a number of times less than or equal to the first number, wherein the first and second beamforming vectors are orthogonal to each other; and transmitting a signal using a beam configured according to the radial mode.

Disclosed in the embodiments of the present application are a codeword determination method for 8-antenna-port multi-antenna panel of uplink MIMO transmission, and an apparatus therefor, which can be used in a communication system. The method comprises: determining a candidate codebook for a 4-antenna-port and / or 2-antenna-port corresponding to uplink MIMO transmission; and determining panel configuration information of an 8-antenna port multi-antenna panel of uplink MIMO transmission; and on the basis of the candidate codebook and the panel configuration information, determining codewords of the L layers of the 8-antenna-port multi-antenna panel. In the embodiments of the present application, high-dimensional 8-antenna-port antenna full-coherent transmission codewords can be constructed on the basis of low-dimensional antenna full-coherent transmission codewords, such that the requirements of the uplink MIMO supporting one layer to eight layers of transmission for the 8-antenna-port can be satisfied, thereby further enhancing the uplink MIMO technology.

Systems and methods described provide a multiple-input multiple-output (MIMO) optimization service. A network device in a RAN predicts high usage thresholds and available per-service resources for supporting MIMO transmissions. The network device identifies, based on the predicted usage thresholds, user equipment (UE) devices that have a high-throughput session and have high usage levels on a cell. The network device assigns, based on the predicted available per-service resources, sounding reference signal (SRS)-based MIMO resources to the UE devices in the cell and assigns codebook-based MIMO resources to other UE devices in the cell.

Aspects of the present disclosure provide systems and methods for supporting multi-layer data transmission. An apparatus (e.g. user equipment), upon request of a network device (e.g. base station), may generate a channel state information (CSI) report based on measurement of synchronization signal-physical broadcast channel (SS-PBCH) blocks (SSBs) transmitted over multiple antenna ports. The CSI report may include information related to apparatus-specific CSI and / or information indicative of quality of sub-channels. The network device may transmit configuration information related to the CSI report, measurement configuration of the SSBs, and / or configurations for supporting early MIMO transmission.

Methods and an apparatus are disclosed for orthogonal frequency division multiplexing (OFDM) and / or single carrier (SC) based multiple input multiple output (MIMO) hybrid beamforming (HBF) including determining the capabilities of a station (STA) such as the capability for hybrid beamforming, single user MIMO (SU-MIMO), and multi user MIMO (MU-MIMO). An announcement frame with a control trailer may be transmitted to signal a transmission configuration. The announcement frame may be a grant frame or a request to send (RTS) frame if the STA is SU-MIMO capable or a RTS frame or a DMG clear to send (CTS)-self frame if the STA is MU-MIMO capable. One or more directional multi-gigabit (DMG) antennas may be configured based on the announcement frame. One or more sounding symbols may be transmitted and feedback may be provided based on the sounding symbols. An HBF signal may be transmitted based on the sounding symbol(s) and / or feedback.

A Wi-Fi station (110; 120) for communication with at least one further Wi-Fi station is disclosed. The Wi-Fi station comprises a communication interface (113; 123) comprising a plurality of antennas (113b; 123b) configured for a multiple-input multiple-output, MIMO, transmission to the at least one further Wi-Fi station with an adjustable transmission Error Vector Magnitude, Tx EVM. The communication interface is further configured to receive from the at least one further Wi-Fi station an indication of a desired Tx EVM for one or more MIMO transmissions from the Wi-Fi station. The Wi-Fi station further comprises a processing circuitry (111; 121) configured to adjust one or more MIMO transmission parameters based on the indication of the desired Tx EVM for adjusting the Tx EVM not to exceed the desired Tx EVM for the one or more MIMO transmissions from the Wi-Fi station.

The present invention discloses a method for selecting a MIMO receiving path at the AP end of a wireless local area network: If there is a data frame to be sent currently, switch to the available transmitting antenna group, send the data and clear the sending status; If there is no data frame to be sent currently, switch to the optimal receiving antenna group, and the AP is in the listening state. If a received data frame is detected, set the receiving status to "1"; If the current receiving status is "1", clear the receiving status and update the terminal uplink service network quality dependence prediction matrix; If the receiving status is "0", or after updating the terminal uplink service network quality dependence prediction matrix, check the training status; If the current training status is "1", traverse all MIMO paths formed by the antenna groups and the terminal, perform AP transmission MIMO path optimization to update the antenna group - terminal MIMO transmission path status matrix, and obtain the updated antenna group receiving MIMO path weight matrix. The present invention also discloses a corresponding device for selecting a MIMO receiving path at the AP end of a wireless local area network.

An access point (AP) for wireless communication may include computing hardware and storage hardware in communication with the computing hardware, the storage hardware storing instructions that, when executed on the computing hardware, cause the computing hardware to perform operations including identifying one or more transmitting stations having one or more spatial data streams at the AP; sending a sounding request from the AP to the one or more transmitting stations; performing multi-user, multi-input, multi-output (MU-MIMO) channel estimation at the AP based on the response to the sounding request; calculating one or more precoding coefficients for the one or more transmitting stations based on the MU-MIMO channel estimate at the AP;and transmitting the one or more precoding coefficients and a transmission trigger from the AP to the one or more transmitting stations;

An apparatus configured to: receive at least one system information block comprising, at least, an indication of a demodulation reference signal port for monitoring for a random access response message; determine based, at least partially, on the at least one system information block, at least one resource for reception of the random access response message; and monitor for the random access response message using the at least one determined resource and the demodulation reference signal port.

In the communication method, a first device generates a first signal, the first signal comprises M1 elements, M1 is determined based on M2 and a first parameter, M1 is a positive integer greater than M2, and M2 is a positive integer. The first device precodes the first signal to obtain a second signal, wherein the second signal comprises M1 elements. And the first device sending a third signal on a first frequency domain resource, the first frequency domain resource including M2 frequency domain units, the third signal being generated based on M2 elements selected from M1 elements included in the second signal. Visibly, according to the method, the time domain FTN is realized by transmitting the information amount of the M1 elements included in the first signal on the M2 frequency domain units. According to the method, the symbol duration is not changed, when the method is applied to a scene of multi-user frequency division multiplexing or MU-MIMO transmission, the symbol durations adopted by multiple users are the same, the CPs are aligned, and inter-user interference caused by different symbol durations of the multiple users is avoided.

【Solution means】The embodiments of this application disclose a method and apparatus for determining an uplink MIMO transmission codeword applicable to a communication system. The method includes the steps of determining candidate codewords for 4Tx and / or 2Tx of uplink MIMO transmission, where the candidate codewords include at least one of a first candidate codeword for antenna full coherent transmission, a second candidate codeword for antenna partial coherent transmission, and a third candidate codeword for antenna non-coherent transmission, and determining a first codeword for antenna partial coherent transmission and / or a second codeword for non-coherent transmission of 8Tx L layers of the uplink MIMO transmission based on the candidate codewords. In the embodiments of this application, based on low-dimensional transmission codewords, high-dimensional 8Tx antenna partial coherent transmission codewords or non-coherent transmission codewords can be constructed, so that uplink MIMO can support transmission requirements from 1 layer to 8 layers of 8Tx, and the uplink MIMO technology can be further enhanced.

Aspects presented herein may improve multiple-input multiple-output (MIMO) operations by providing a semi-open-loop MIMO scheme with a higher granularity. In one aspect, a network entity formulates, based on wideband (WB) channel state information of a channel from a user equipment (UE), a set of precoding matrices to be applied on a set of resource blocks (RBs) or a set of resource elements (REs) for a data channel transmission on the channel. The network entity precodes the set of RBs or the set of REs for the data channel transmission on the channel with the formulated set of precoding matrices and a set of phase values in a cycling manner. The network entity transmits, via the channel, an indication of the set of precoded RBs or the set of precoded REs.

Techniques and apparatuses are described for multiple-input multiple-output transmissions using adaptive phase-changing devices. In aspects, a base station selects one or more adaptive phase-changing devices, APDs, to use in at least one communication path for multiple-input, multiple-output, MIMO, transmissions. The base station can perform a channel characterization process for the at least one communication path using the at least one APD and at least one UE. Based on results of the channel characterization process, the base station configures the at least one APD by which to implement single user-MIMO communication with a UE or multiple user-MIMO communication with multiple UEs. By so doing, the base station may implement MIMO transmissions using APDs to communicate with the at least one UE using same time and frequency resources, which can improve spectral efficiency of a wireless network.

Systems and methods are provided to implement features in the IEEE 802.11ad+ / ay protocols by utilizing combinations of analog and digital precoding (such as hybrid mmWave precoding) to enable multi-stream / multi-user transmissions. These systems and methods are also suitable for 5G wireless networks, such as found in 3GPP. These systems and methods address performing general precoder design, reducing of beam-training overhead with leak wave antennas, performing single-stage approximate precoding with enhanced SLS for SU-MIMO transmissions (eSLS1), performing multi-stage approximate precoding with enhanced SLS for SU-MIMO transmissions (eSLS2), and performing exact precoding with enhanced SLS for SU-MIMO transmissions.

A communication method and apparatus. In the communication method, a first device generates a first signal, the first signal comprising M1 elements, M1 being determined on the basis of M2 and a first parameter, M1 being a positive integer greater than M2, and M2 being a positive integer. The first device precodes the first signal to obtain a second signal, the second signal comprising M1 elements. The first device sends a third signal on a first frequency domain resource, the first frequency domain resource comprising M2 frequency domain units, and the third signal being generated on the basis of M2 elements selected from among the M1 elements comprised in the second signal. Thus, according to the method, time domain FTN can be achieved by means of transmitting the information amount of the M1 elements comprised in the first signal on the M2 frequency domain units. According to the method, symbol durations are not changed, and when the method is applied to scenarios of multi-user frequency-division multiplexing or MU-MIMO transmission, symbol durations used by multiple users are the same and CPs are aligned, thereby preventing inter-user interference caused by different symbol durations among multiple users.

A communication method and device, applied to the technical field of communications, the method comprising: a first communication device receiving first information from a second communication device, the first information comprising a first field and / or a second field, the first field indicating a DMRS pattern, the second field indicating a DMRS port, an RRC link not being established between the first communication device and the second communication device, and / or the physical shared channel corresponding to the first communication device is scheduled by the DCI 10 or the DCI 0; and the first communication device performs physical shared channel transmission with the second communication device according to the first information. According to the embodiment of the invention, flexible configuration of the DMRS pattern and the DMRS port can be realized under the condition that an RRC link is not established between the terminal equipment and the network equipment, the configuration is not limited to SU-MIMO single-stream transmission, SU-MIMO multi-stream transmission and MU-MIMO transmission can also be supported, and the communication performance of a communication system can be improved.