Abstract: There is provided mechanisms for adaptive cell-shaping in a cellular network in which a group of radio access network nodes provide network access. A method is performed by a network node. The method comprises obtaining an indication of combined network performance degradation in a region in which a first radio access network node in the group of radio access network nodes provides network access and increased need for network access for prioritized service and/or prioritized subscribers in this region. The method comprises initiating adjustment of cell-degradation shaping parameters of at least one radio access network node in the group of radio access network nodes. Network access for the prioritized service and/or prioritized subscribers in the region is maintained by this at least one radio access network node in the group of radio access network nodes.

Abstract: There is provided mechanisms for rotational movement triggered candidate beam updating at a terminal device. A method is performed by the terminal device. The method comprises performing beamformed communication, in a first beam having a first pointing direction, with a transmission and reception point. The method comprises detecting that the terminal device is subjected to a rotational movement. The rotational movement causes the first beam to change its pointing direction. The method comprises updating, upon having detected that the terminal device is subjected to the rotational movement, a candidate set of second beams to be used for beam training. The candidate set of second beams, upon having been updated, comprises at least one second beam having a predefined pointing direction.

Abstract: Mechanisms for beam management. An example method, in a network node, comprises transmitting a reference signal so as to enable each of the terminal devices participating in a first part of the beam management procedure to identify in which of a first set of beams the reference signal is received with highest power. The method comprises transmitting the reference signal in a second part of the procedure so as to enable each of the terminal devices to identify in which of a second set of beams the reference signal is received with highest power. The method comprises transmitting the reference signal during a third part of the procedure so as to enable each of the terminal devices to identify in which of a third set of beams the reference signal is received with highest power. There is one third set for each beam in the first set.

Abstract: There is provided mechanisms for estimating angle of arrival of a radio signal in a radio communications network. A method is performed by a receiving radio transceiver device. The method comprises obtaining measurements of the radio signal as received in two receive beams covering a given angular sector. The two receive beams are created by analog beamforming in an antenna array. The receive beams have different complex beam patterns and at any angle within the given angular sector at most one of the complex beam patterns has gain below a threshold. The method comprises estimating the angle of arrival of the radio signal by comparing a complex amplitude of the measurements in the two receive beams to a discriminator function.

Abstract: There is provided mechanisms for determining beam settings for beam management. A method is performed by a first radio transceiver device. The method comprises obtaining information about expected distribution of second radio transceiver devices in a network coverage region of the first radio transceiver device in which the beam management is to be performed. The method comprises determining beam settings for a first set of beams and a second set of beams. The first set of beams and the second set of beams are to be used for the beam management. There are fewer beams in the first set of beams than in the second set of beams. The beams in the first set of beams collectively cover all beams in the second set of beams. The beam settings for the beams in the first set of beams are determined according to the obtained information.

Abstract: A method for beam management, which method is performed by a network node. The method provides for using a first receive, RX, beam to receive a first signal transmitted by a user equipment, UE. The method then provides for obtaining, based on the first signal received using the first RX beam, a first received signal power value, P1. The method then provides for using a second RX beam to receive the first signal or another signal transmitted by the UE. The method then provides for obtaining, based on the signal received using the second RX beam, a second received signal power value, P2. The method then provides for determining whether P2 exceeds P1 by at least a threshold. The method then provides for determining whether to initiate a beam sweep based on whether or not P2 exceeds P1 by at least the threshold.

Abstract: A mechanisms for beam training. The method includes receiving, using a fixed beam, a first occurrence of a set of beam reference signals. The method includes determining a respective compensation factor for at least one of the received beam reference signals. The method includes receiving, using a set of directional beams, a second occurrence of the set of beam reference signals. The method includes evaluating which directional beam in the set of directional beams to use for subsequent communication with the network node based on strongest received beam reference signal in the second occurrence of the set of beam reference signals as compensated for using the compensation factors.

Abstract: A method of identifying reference signal resources to be used in a transmission by a wireless device is disclosed. The method comprises a wireless device receiving signaling configuring the wireless device with a plurality of reference signal resource groups, each group comprising a plurality of reference signal resources. The wireless device subsequently receives an indication, in a control channel, of a selection of reference signal resources to be used. Each of the plurality of reference signal resources to be used is selected from a different one of the plurality of reference signal resource groups such that reference signal resources belonging to the same reference signal resource group are not selected for simultaneous use. A reference signal is then transmitted to a network node in the network using the indicated selection of reference signal resources.

Abstract: There is provided mechanisms for transmission of reference signals. A method is performed by a terminal device. The terminal device comprises at least two physical antenna ports. The method comprises obtaining channel information. The method comprises determining, for at least one given precoder in a codebook, an uplink reference signal to physical antenna port mapping based on the channel information. The method comprises transmitting uplink reference signals in the physical antenna ports according to the determined mapping.

Abstract: A user equipment (UE) determines a receive (RX) spatial filter for receiving both a first measurement resource and a second measurement resource. The RX spatial filter is determined based on a first spatial quasi-co-located (QCL) reference associated with the first measurement resource and a second spatial QCL reference associated with the second, measurement resource. The UE measures the first and second measurement resources with the determined Rx filter configuration.

Abstract: The invention relates to a wireless communication device 1 having an upper part 10 and a bottom part 11, the upper part 10 comprising one or more transmission antenna device(s) 12a, 12b; 15. The upper part 10 and the bottom part 11 are arranged movably in relation to each other, so that the bottom part 11, in use mode, is closer to the user than the upper part 10. The bottom part 11 comprises one or more reception antenna device(s) 14a, 14b, 14c, 14d.

Abstract: Some embodiments of this disclosure provide a method performed by one or more transmission points, TRPs, for communicating with a user equipment, UE. In some embodiments, the method includes: using a first transmit, TX, beam to communicate with the UE; receiving, from the UE, information indicating that the UE has determined that the first TX beam has experienced a beam failure; and after the information is received, using a second TX beam to communicate with the UE.

Abstract: A method performed in a network node of a communication system for muting antenna elements of an active antenna system. The method comprises determining, based on a priori information relating to performance of the communication system, an antenna element separation between one or more pairs of active antenna elements of at least a subset of all active antenna elements of the active antenna system; and muting at least one antenna element such that the determined antenna element separation is obtained between each of the one or more pairs of active antenna elements of at least the subset of all active antenna elements.

Abstract: A method for acquiring an indication of a preferred beam of a wireless communication device is disclosed. The method is performed in a network node of a cellular communication network. The network node is adapted to support a plurality of beams of a signal beam-forming scheme and to communicate with the wireless communication device using at least one beam of the plurality of beams. A message indicative of the beam power setting is transmitted to the wireless communication device. Measurement signals are also transmitted. A report indicative of the preferred beam is received from the wireless communication device. The preferred beam is determined by the wireless communication device based on the measurement signals and the beam power setting. Corresponding methods for the wireless communication device, as well as corresponding arrangements, network node, wireless communication device, cellular communication network, and computer program products are also disclosed.

Abstract: Systems and methods for beam selection for communication with a Transmit/Receive Point (TRP) are provided. In some embodiments, a method performed by a wireless device for beam selection for communication with a TRP includes: determining how the TRP changes a polarization state for a series of Synchronization Signal Block (SSB) bursts; sweeping through candidate Receive (RX) beams during SSB reception using an order based on how the TRP changes the polarization state; and combining channel measurements from sweeping through the candidate RX beams to determine a target RX beam of the candidate RX beams. In this way, wireless device beam selection can be improved which will improve Downlink (DL) performance. In case the wireless device has beam correspondence, the wireless device RX beam is also likely to be used as the Uplink (UL) Transmit (TX) beam, and in that case UL performance will also be improved.

Abstract: A method for selecting one or more TX beams to identify in a beam report. The method includes a UE obtaining i) a first interference value, 1a, associated with a first antenna arrangement and ii) a second interference value, 1b, associated with a second antenna arrangement. The method also includes the UE obtaining i) a power value, P1a, associated with the first antenna arrangement and with a first TRP TX beam and ii) a power value, P1b, associated with the second antenna arrangement and with the first TRP TX beam. The method further includes the UE determining a first final power value, Pn1, based on 1a and 1b and based on at least one of P1a, and P1b. The method also includes the UE using Pn1 to determine whether or not to include in the beam report an identifier for identifying the first TRP TX beam.

Abstract: A TRP selects two UEs that have potential for MU-MIMO transmission, and the TRP then measures signal and interference for each panel in both UEs based on UL beam management for a set of one or more candidate TRP beams. Based on the measurements, the TRP determines if multi-user transmission (i.e., co-scheduling of the two UEs) is possible.

Abstract: There is provided mechanisms for obtaining channel conditions per antenna element, A method is performed by a wireless radio transceiver device comprising N antenna elements in an antenna array with analog beamforming and being configured to communicate using beams. The method comprises obtaining, for a stationary radio propagation channel, channel conditions for signals received by the wireless radio transceiver device in M beams, where M>1. The method comprises transforming the channel conditions for the M beams to channel conditions for the N antenna elements by using a relation based on beamforming weights that map the N antenna elements to the M beams.

Abstract: A radio network node (12) is configured for use in a multi-user multiple-input multiple-output (MU-MIMO) wireless communication system (10). The radio network node (12) in this regard is configured to precode a downlink reference signal (22) to suppress the downlink reference signal (22) in a certain direction (D1) that is subject to interference between MU-MIMO uplink transmissions received in the certain direction from different wireless devices (14A, 14B). The radio network node (12) is further configured to transmit the precoded downlink reference signal (22) to at least a first one (14A) of the wireless devices. The radio network node (12) in some embodiments is also configured to transmit signaling (30) indicating that the precoded downlink reference signal (22) is usable by the first wireless device (14A) to derive a non-codebook based precoding of an uplink signal transmitted by the first wireless device (14A).

Abstract: There is provided mechanisms for estimating angle of arrival of a radio signal in a radio communications network. A method is performed by a radio transceiver device. The radio transceiver device comprises an antenna array that, by means of analog beamforming, is configured to shift between at least two phase center locations. The method comprises obtaining measurements of the radio signal as received by the antenna array using two mutually different phase center locations. The method comprises estimating the angle of arrival of the radio signal using the measurements as obtained using the two mutually different phase center locations.