Telefonaktiebolaget Lm Ericsson (publ)

Guangdong Oppo Mobile Telecommunications Corp., Ltd.

Niklas Wernersson

Sebastian Faxér

Maksym Girnyk

Simon Järmyr

Robert Mark Harrison

George Jöngren

Svante Bergman

Roy Timo

Mattias Frenne

Andreas Nilsson

Ravikiran Nory

David Hammarwall

Zhao Wang

Heunchul Lee

Stephen J Grant

Claes Tidestav

Sebastian FAXÉR

Fredrik Athley

Joao Vieira

Nima Seifi

Muris Sarajlic

Shiwei Gao

Sven Oscar Petersson

Siva Dharshan Muruganathan

Bo Göransson

Arne Simonsson

Gustav Wikström

Miguel Berg

Henrik Asplund

Chenguang Lu

Sara Sandberg

Eleftherios Karipidis

Yezi Huang

Yuri C B Silva

Elvis M G Stancanelli

Paulo G Normando

Sebastian Faxer

Simon Jämyr

Stephen Grant

Lee Heunchul

Simon JÄRMYR

A method, system and apparatus for beamforming techniques that use approximate channel decomposition are disclosed. According to one aspect, a wireless device is provided. The wireless device includes processing circuitry configured to use a non-constant modulus, NCM, precoder of a NCM codebook to transmit on a physical channel where the NCM codebook is based at least in part on a constant modulus, CM, codebook and a plurality of NCM component matrices, and where the plurality of NCM component matrices are based at least in part on a NCM component matrix mathematical expression, and where an approximate decomposition element-wise product of a CM component matrix mathematical expression and the NCM component matrix mathematical expression corresponds to a channel decomposition matrix.

Beamforming technique using approximate channel decomposition

A network node signals to a wireless communication device which precoders in a codebook are restricted from being used. The network node in this regard generates codebook subset restriction signaling that, for each of one or more groups of precoders, jointly restricts the precoders in the group by restricting a certain component (e.g., a certain beam precoder) that the precoders in the group have in common. This signaling may be for instance rank-agnostic signaling that jointly restricts the precoders in a group without regard to the precoders' transmission rank. Regardless, the network node sends the generated signaling to the wireless communication device.

Codebook subset restriction signaling

A method performed by a wireless device () for reporting channel state information (CSI) for a downlink channel is disclosed. The method comprises transmitting () a CSI report for the downlink channel to a network node (), the CSI report comprising: a set of reported coefficients; an indication of how the network node is to interpret the set of reported coefficients; and an indication of a payload size of the set of the reported coefficients.

Reporting of coefficients for channel state information

There is provided an antenna arrangement having unequally many physical antenna elements for transmission and reception. The antenna arrangement comprises physical antenna elements. All physical antenna elements are configured for signal reception but less than all of the physical antenna elements are configured for both signal transmission and signal reception. A first portion of those physical antenna elements configured for both signal transmission and signal reception and a second portion of those physical antenna elements configured for both signal transmission and signal reception are in the antenna arrangement placed to, during operation of the antenna arrangement, be vertically separated by physical antenna elements configured for only signal reception.

Antenna arrangement having unequally many physical antenna elements for transmission and reception

A user equipment (UE) being configured to receive a downlink (DL) information, determine a spatial association for an uplink (UL) transmission based on the DL information, and determine UL power control (PC) parameters based on the DL information.

Beam indication for uplink power control

A method performed by a wireless device () is disclosed. The wireless device obtains () a configuration for a sub-band channel quality indicator (CQI) granularity and a sub-band precoding matrix indicator (PMI) granularity for the wireless device. The wireless device determines () channel state information (CSI) feedback according to the configured sub-band CQI granularity and the sub-band PMI granularity. The sub-band PMI granularity corresponds to a first sub-band size and the sub-band CQI granularity corresponds to a second sub-band size. The first sub-band size is smaller than the second sub-band size. The wireless device transmits (), to a network node (), the determined CSI feedback.

Independent sub-band size for precoding matrix indicator and channel quality indicator

Embodiments include methods, performed by a user equipment (UE), for transmitting or receiving a plurality of physical data channels in a wireless network. Such methods include receiving, from the wireless network, an indication of a Transmission Configuration Indicator (TCI) state that includes one or more source reference signal (RS) pairs. Each source RS pair has a pair of quasi-colocation (QCL) relations with antenna ports, for demodulation reference signals (DM-RS), that are mapped to a plurality of code-division multiplexing (CDM) groups. Such methods include receiving/transmitting the physical data channels based on the QCL relations for the source RS pairs of the indicated TCI state. Each physical data channel corresponds to a CDM group and is received/transmitted in association with the DM-RS having antenna ports mapped to the corresponding CDM group. Other embodiments include complementary methods performed by a wireless network, and UEs and wireless networks configured to perform such methods.

Code-division multiplexing (CDM) groups for multi-source transmission

The present disclosure relates to a method performed by a wireless node () for transmitting reference symbols, the node comprising an antenna with a plurality of antenna ports, the method comprising configuring channel state information, CSI, measurements of a user equipment, UE (), by transmitting a downlink message, transmitting a first reference symbol using the plurality of antenna ports, wherein the first reference symbol is transmitted using a first number N of antenna ports, transmitting a second reference symbol using the plurality of antenna ports, wherein the second reference symbol is transmitted using a second number K of antenna ports, wherein the first reference symbol is transmitted using a first port distance smaller than a second port distance used when transmitting the second reference symbol, and wherein the K used antenna ports are less than the N used antenna ports.

Scalable method for obtaining UE-specific CSI

Systems and methods are disclosed herein for determining a power to be used for a set of antenna ports for a physical uplink shared channel transmission. In some embodiments, a User Equipment (UE) comprises processing circuitry configured to derive a power P to be used for uplink power control for a physical uplink shared channel transmission and determine a power to be used for a set of antenna ports based on the power P according to a rule that depends on whether the UE is utilizing codebook based transmission or non-codebook based transmission for the physical uplink shared channel transmission. The set of antenna ports is antenna ports on which the physical uplink shared channel transmission is transmitted with non-zero power.

Power control for new radio uplink single-user multiple-input-multiple-output communication

According to some aspects of the techniques disclosed herein, a UE adapted to transmit on different antenna subsets transmits an indication that the UE can transmit a number of distinct RS resources, where each of the RS resources comprises at least one RS port. The UE transmits capability information indicating that the UE is capable of transmitting simultaneously on multiple RS resources and/or receives first and second RS configurations, where the first RS configuration is a first list of SRS resources that at least correspond to RS resource indications used for PUSCH transmission, and the second RS configuration is a second list of RS resources that may be used for SRS transmission. The UE receives an indication of at least one RS resource and transmits a physical channel on antennas of the UE associated with the indicated RS resources.

Multi-resource uplink sounding and antenna subset transmission

A method performed by a wireless device () for determining whether the wireless device is power limited is disclosed. The method comprises receiving (), from a network node (), a transmit power control (TPC) command for one or more of a plurality of power control loops configured at the wireless device. The method comprises obtaining () an indication of the one or more of the plurality of power control loops to which the received TPC command applies. The method comprises determining (), based on the obtained indication, whether one or more conditions related to power control at the wireless device are fulfilled. The method comprises determining () whether the wireless device is power limited based on whether the one or more conditions are fulfilled.

Limiting accumulation of transmit power control in beam-specific power control

Methods and apparatus for communicating power information to a base station () from a wireless device () having multiple transmission entities. An example method performed by the base station comprises receiving () a plurality of indications of power reporting parameters from the wireless device, each of the power reporting parameters corresponding to a respective uplink transmission entity (UTE) of the wireless device. The power reporting parameters corresponding to respective UTEs include power headroom values and/or maximum carrier power values.

Power control reporting in a wireless communication system

A method performed by a wireless device for transmitting a channel state information (CSI) report for a downlink channel comprises obtaining a first set of candidate frequency-domain components and determining a set of spatial-domain components. The method comprises determining a second set of candidate frequency-domain components as a subset of the first set of candidate frequency-domain components. The method comprises determining, for each spatial-domain component of the set of spatial-domain components, a spatial-domain component-specific set of frequency-domain components as a subset of the second set of candidate frequency-domain components. The method comprises transmitting, to a network node, the CSI report.

Hybrid common/independent FD-basis for type II CSI enhancement

Hybrid common/independent FD-basis for Type II CSI enhancement

Embodiments include methods for operating a network node in a wireless network. Such embodiments include applying non-linear precoding to a first data stream to remove a representation of expected inter-stream interference due to a second data stream, thereby generating a corrected first data stream. Such embodiments also include applying linear precoding to the corrected first data stream and to a first reference signal (RS) stream to generate a first signal layer. The first RS stream is not corrected for the expected inter-stream interference prior to applying the linear precoding. Such embodiments also include transmitting the first signal layer to a user equipment (UE). Other embodiments include complementary methods performed by a UE, as well as network nodes and UEs configured to perform operations corresponding to such methods.

Methods for reference signal mapping in non-linear precoding MIMO transmission

Growing community of inventors

Kungsängen, Sweden

Niklas Wernersson