Telefonaktiebolaget Lm Ericsson (publ)

Magnus Thurfjell

Arne Simonsson

Peter Ökvist

Henrik Asplund

Mårten Ericson

Sara Sandberg

Jonas Medbo

Kjell Larsson

Sara Landström

Anders Landström

Fredrik Athley

Stefan Wänstedt

Stephen G Craig

Peter De Bruin

Sverker Magnusson

Erik Edgren

Sven Oscar Petersson

Min Wang

Jan Christoffersson

Jonas Fröberg Olsson

Magnus Norberg Olsson

Anders Furuskär

Fredrik Lindqvist

Kristina Jersenius

Jessica Östergaard

Tomas Jönsson

Kristofer Sandlund

Christina Larsson

Nima Seifi

Paul Mihkel Teder

Mathias Riback

Olle Rosin

Sven-Olof L Jonsson

Medhat Mohamad

Ame Simonsson

Fredrik Hagglund

Jan Roger Sakari Pirinen

Fredrik Hägglund

A method performed by a first node for adjusting channel coefficients of a wireless channel between the first node and a second node in a wireless communications network is provided. The first node obtains a calculated current correlation value between the first channel coefficients estimated in a first time instant, and the second channel coefficients estimated in a second time instant. The second time instant is subsequent to the first time instant. The first node obtains a previous correlation value calculated at a previous time instant. The first node determines a phase adjustment value based on an estimated phase difference to be applied to the estimated second channel coefficients associated with the wireless channel. The phase difference is estimated between the current correlation value and the previous correlation value.

Node and method for adjusting channel coefficients of a wireless channel

Embodiments herein relate to a method performed by a radio unit () for controlling power levels of spatially separated transceivers (-) connected to the radio unit () via corresponding antenna ports (a-j). Each transceiver (-) is capable of performing measurements on uplink transmissions from wireless devices in a wireless communication network (). The radio unit () receives, from each transceiver (-), measurements on uplink transmissions from wireless devices. Then, the radio unit () determines, for each transceiver (-), a load based on how many wireless devices that have the transceiver as the transceiver with the most relevant measurement for its uplink transmissions. The radio unit () also controls a power level of at least one first transceiver () based on at least one of the determined loads for the transceivers (-). Embodiments of the radio unit () are also described.

Radio unit and a method therein for controlling power levels of spatially separated transceivers in a wireless communications network

A network node and a method for transmitting a Transmission Configuration Indication, TCI, update to a UE. The network node associates a first transmit beam with a first reference signal having first Quasi Co-Location, QCL, channel properties. The first transmit beam gives the same first QCL channel properties and is used in data transmission to the UE. Further, the network node determines second QCL channel properties given by a second transmit beam when a beam change is triggered. When the second QCL channel properties is within a QCL channel property range of a second reference signal and when the second reference signal has third QCL channel properties being different from the first QCL channel properties, the network node associates the second transmit beam with the second reference signal, and transmits, to the UE, a TCI update having an indication of the second reference signal.

Radio network node and methods therein for transmitting a transmission configuration indication (TCI) update to a wireless device

There is provided mechanisms for beam management. A method is performed by a radio transceiver device. The method comprises obtaining an angle spread value for signal paths towards a second radio transceiver device. The method comprises performing a beam management procedure for selecting which directional beam to use for communication with the second radio transceiver device by transmitting or receiving reference signals in a candidate set of directional beams. Which directional beams to include in the candidate set of directional beams is dependent on the angle spread value by the angle spread value determining sparsity of the directional beams in the candidate set of directional beams.

Beam management for a radio transceiver device

There is provided a method, performed by a network unit, for enabling management of random access attempts in a wireless communication system by a plurality of devices having wireless communication capabilities. The method comprises obtaining (S) information representing the load of random access attempts, and determining (S), based on the information representing the load of random access attempts, control information for controlling a distribution of the random access attempts over time.

Enabling management of random access attempts in a wireless communication system

Method performed by a first node () for managing a movement of a radio antenna (). The first node () operates in a wireless communications network (). The first node () determines () whether the movement of the radio antenna () is above a threshold over a time period. The radio antenna () is connected to a second node () operating in the wireless communications network (). The movement is with respect to at least one wireless device () operating in the wireless communications network (). The determining () is based on an analysis of one or more properties of radio transmissions to or from the radio antenna () over the time period. The first node () initiates () providing a message to one of: the second node () and a third node () operating in the wireless communications network (). The initiation is based on a result of the determination.

First node, third node, and methods thereby, for managing a movement of a radio antenna

Mechanisms for selecting beam direction for a radio communications device are provided. A method is performed by the radio communications device. The method includes obtaining radio channel estimates of a radio channel on which radio waves have been transmitted between the radio communications device and another radio communications device at an angle of arrival and departure. The method includes determining a Doppler shift from the radio channel estimates. The method includes estimating at least one of the angle of arrival and departure of the radio waves based on the Doppler shift. The method includes selecting a beam direction for a signal to be transmitted between the radio communications device and this another radio communications device over the radio channel according to the estimated angle of arrival or departure.

Beam direction selection for a radio communications device

A method performed by a first radio node for selecting a transmission rank is provided. The radio node is capable of using at least a first antenna beam and a second antenna beam for communication with a second radio node in a wireless communication network. The radio node communicates with the second radio node by using the first antenna beam and a first transmission rank. The radio node obtains second radio parameters for the second antenna beam. The radio node then selects a second transmission rank based on the obtained second radio parameters. The second transmission rank is to be used for communication with the second radio node in the second beam. The selection of the second transmission rank is triggered before obtaining any Rank Indicator (RI) for the second antenna beam.

Selecting a transmission rank in a multiple beam antenna system

There is provided mechanisms for assigning beams to terminal devices in a communications network. A method is performed by a network node. The method comprises determining an initial set of beams for serving the terminal devices, whereby each terminal device is assigned at least one of the beams. The method comprises obtaining an indication that further beams, in addition to those in the initial set of beams, are available for serving the terminal devices. The method comprises evaluating whether to expand the initial set of beams with the further beams or not, whereby the further beams are assigned to the terminal devices according to a criterion, until a resource utilization threshold is reached.

Beam assignment in a communications network

Mechanisms for determining directional beamforming weights are disclosed. A method performed by a radio transceiver device includes obtaining, from measurements on reference signals, channel estimates per antenna port and frequency. The channel estimates are indicative of power delay values per antenna port towards another radio transceiver device. The method includes determining modified channel estimates per antenna port and frequency with the power delay values outside a threshold delay window being suppressed. The method includes determining directional beamforming weights for beam-formed transmission towards said another radio transceiver device based on the modified channel estimates per antenna port and frequency.

Determination of directional beamforming weights

A method performed by a first communication device operating in a wireless communications network. The first communication device obtains a set of correspondences associating: i) each set (&#x3c9;) of a plurality of sets of antenna weights (&#x3c9;. . . &#x3c9;) having been sent by a third communication device in response to having received a respective set (RSs) of a plurality of sets of radio signals (RSs. . . RSs) from a set of antenna ports in a second communication device, with ii) a respective direction of transmission (d) between the second communication device and the third communication device. The respective direction is relative to an orientation (&#x3b1;) of the second communication device. The respective direction of transmission (d) is a selected direction of transmission (d). The first communication device then initiates transmission of a new radio signal, based on the obtained set of correspondences.

First communication device and methods thereby for initiating transmission based on an obtained set of correspondences

A method performed by a radio node for increasing a throughput of a MIMO channel. The radio node operates in a wireless communication network. The beams are beamformed at a transmitter of the radio node. The beams comprise: A first beam comprising a first beam gain in a first direction, and at least one second beam wherein each at least one second beam comprises a respective second beam gain in a respective second direction. When decided that the signal strength on the first beam is a first threshold stronger than the signal strength on each respective at least one second beam, and the signal strength on the at least one second beam is above a second threshold, the radio node increasing the throughput of the MIMO channel by suppressing () the first beam with respect to its beam gain.

Radio node and methods in a wireless communications network

Systems and methods of sharing channel information between co-located radio nodes are provided. In one exemplary embodiment, a method performed by a second radio node () of sharing channel information between a first radio node () and the second radio node that are co-located () may include obtaining (), by the second radio node, first channel information characterizing a communication channel (-) between a third radio node () and the first radio node in a first frequency band. Further, the method may include using (), by the second radio node, the first channel information for communication with the third radio node or a fourth radio node () in a second frequency band.

Systems and methods of sharing channel information between co-located radio nodes

There is provided mechanisms for beam width adjustment. A method is performed by a radio transceiver device. The method comprises communicating, using a current beam, with another radio transceiver device. The method comprises obtaining a signal strength indicator and a transmission rank of the current beam. The method comprises determining an adjustment indicator for adjusting beam width of the current beam for continued communications with said another radio transceiver device. The adjustment indicator is based on the signal strength indicator and the 0 transmission rank. The method comprises initiating adjustment of the beam width according to the adjustment indicator.

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Luleå, Sweden

Magnus Thurfjell