Telefonaktiebolaget Lm Ericsson (publ)

Lei Bao

Erik Bengt Dahlman

Boris Dortschy

Behrooz Makki

Yezi Huang

Magnus Åström

Zhipeng Lin

Jonas Hansryd

Henrik Sahlin

Mikael Coldrey

Per-Erik Eriksson

Per Ligander

Bengt-Erik Olsson

Mona Hashemi

Martin Sjödin

Cristian Czegledi

Sinh Nguyen

Muhammad Ali Kazmi

Andreas Nilsson

Jose Luis Pradas

Martin Johansson

Helka-Liina Määttänen

Thomas Chapman

Filip Barac

Mats Rydström

Christina Larsson

Thomas Ove Emanuelsson

David Carling

Chunhui Zhang

Andreas Wolfgang

Anna Rhodin

Edvin Catovic

Mattias Rydström

A method, system and network node are disclosed. According to one or more embodiments, a parent network node configured to communicate with a network node is provided. The parent network node is configured to, and/or includes a radio interface and/or includes processing circuitry configured to: enable a first timing configuration, wherein the first timing configuration enables downlink transmission timing for the network node to be aligned with the downlink transmission timing of the parent network node; and based on the first timing configuration, switch to a second timing configuration, wherein the second timing configuration enables uplink transmission timing of the network node to be aligned with the downlink transmission timing of the network node.

IAB Case-6 timing and adjustment

There is provided a method for resource coordination in a first donor Integrated Access Backhaul (IAB) node connected to a first parent IAB node which is connected to an IAB node, the IAB node further being connected to a second parent IAB node which is connected to a second donor IAB node. The method comprises: sending, to the second donor IAB node, an indication of a first resource configuration for the IAB node, the first resource configuration determined by the first donor IAB node; receiving, from the second donor IAB node, a request for a second resource configuration for the IAB node; and determining a resource configuration for the IAB node based at least on one of the first resource configuration and the second resource configuration.

Methods and nodes for IAB inter-donor multi-parent resource coordination

Methods and apparatuses are disclosed for determining a muting pattern of a synchronization signal block (SSB) transmission for Integrated Access and Backhaul (IAB) node measurement. In one embodiment, a network node is configured to indicate a first muting pattern, the indication of the first muting pattern indicating at least one first synchronization signal block, SSB, transmission opportunity associated with SSB transmission configuration, STC, that is mutable by an Integrated Access Backhaul, IAB, node. In one embodiment, a network node is configured to determine a first muting pattern, the first muting pattern indicating at least one SSB transmission opportunity associated with a STC that is mutable by the network node; and mute the at least one first SSB transmission opportunity according to the determined first muting pattern.

Methods for determining a muting pattern of SSB transmission for IAB node measurement

A method, system, network nodes and apparatus are disclosed. According to one or more embodiments, a donor integrated access backhaul, IAB, node configured with a distributed unit, DU, for communicating with a wireless device and configured with a central unit, CU, for communicating with at least a first child IAB node is provided. The donor IAB node includes processing circuitry configured to indicate a determined first synchronization signaling blocks, SSB, transmission configuration, STC, for the at least first child IAB node, to the at least first child IAB node where the first STC is associated with inter-node measurement.

IAB-CU managed time-pattern configuration for IAB inter-node measurement

A method and network node having integrated access and backhaul (IAB) functionality are disclosed. According to one aspect, a network node determines information concerning at least one of: (i) an impairment of a first signal from a first integrated access backhaul node that is caused by a second signal from a second IAB node and (ii) an impairment of the second signal that is caused by the first signal. The network node further selects a multiplexing capability for the network node based at least in part on the determined information concerning at least one of the impairments and further multiplexes signals for the first and second IAB nodes using the selected multiplexing capability.

Method to determine the capability of simultaneous operation in IAB nodes

A computer-implemented method, performed in a network node, for estimating one or more relative channel gains and one or more channel phases associated with a wireless propagation channel (H) between N transmit antennas () and M receive antennas () in a line-of-sight, LOS, multiple-input multiple-output, MIMO, communication system (), the method comprising configuring a channel equalizer to compensate for differences in complex gain over the wireless propagation channel (H) between the N transmit antennas () and the M receive antennas (), configuring a phase tracker to compensate for differences in phase between a set of transmit side oscillators () at the N transmit antennas () and a set of receive side oscillators () at the M receive antennas (), obtaining a set of equalizer coefficients (W) from the channel equalizer indicative of relative complex gain differences of propagation paths between the N transmit antennas () and the M receive antennas (), obtaining a set of phase compensation values (E) from the phase tracker representing estimated phases of the set of transmit side oscillators and the set of differences of propagation paths between the N transmit antennas (220) and the M receive antennas (230), obtaining a set of phase compensation values (E) from the phase tracker representing estimated phases of the set of transmit side oscillators and the set of receive side oscillators, and upon the channel equalizer meeting a convergence criterion, estimating the one or more relative channel gains and the one or more channel phases based on an inverse function of the set of equalizer coefficients (W) and the set of phase compensation values (E).

Pilot-less channel estimation and evaluation for LOS-MIMO microwave radio links

There is disclosed a method of operating an Integrated Access and Backhaul (IAB) node (, C, N) in a wireless communication network, the IAB node being in a communication link with a second IAB node using a signaling beam, the IAB node further being scheduled to perform beam sweeping with a plurality of synchronisation beams, one of the synchronisation beams corresponding to the signaling beam; wherein a synchronisation beam is scheduled to carry synchronisation signaling; and wherein the method comprises performing beam sweeping such that the synchronisation beam corresponding to the signaling beam carries information signaling replacing the synchronisation signaling at least in part. The disclosure also pertains to related methods and devices.

Synchronisation signaling for integrated access and backhaul nodes

Method for propagation channel estimation in an N×M Multiple-Input-Multiple-Output (MIMO) communication system comprising a transmitter () comprising N transmit antennas and a receiver () comprising M receive antennas and a MIMO equalizer () comprising multiple taps, where N>1 and M>1. The method includes producing (s) a single tap equalizer (Q) based on a multi-tap equalizer (Q). The method also includes producing (s) an inverse effective-channel estimate (Q) based on Q, The method also includes inverting (s) Qto produce an effective-channel estimate (H), The method also includes producing (s) Hbased on H—wherein Hcan be used to determine one or more performance metrics.

Multiple-input-multiple-output (MIMO) channel estimation

An IAB node performs a method for determining a periodicity of a SSB and/or a RMSI for use in an IAB backhaul link. The method may comprise one or more of: using a predetermined periodicity value; determining a periodicity value based on at least one different parameter; receiving a signaling message indicating a periodicity value and using the indicated periodicity value for the IAB backhaul link; and selecting a periodicity value from a plurality of permitted periodicity values.

Determination of SSB/RMSI periodicity for IAB node

Embodiments of a method performed by an Integrated Access and Backhaul (IAB) node to perform initial cell access in a cellular communications network and corresponding embodiments of an IAB node are disclosed. In some embodiments, the method performed by the IAB node comprises detecting a Synchronization Signal/Physical Broadcast Channel Block (SSB) of a cell and reading system information comprising a value of a parameter from the SSB. The method further comprises determining that the value of the parameter is a predefined value that serves as an indication to IAB nodes that additional system information is present on the cell and searching for the additional system information in accordance with the value of the parameter. In some embodiments, the predefined value of the parameter serves as an indication to one or more other types of nodes that additional system information is not present on the cell.

IAB initial access

The present disclosure relates to a point to point radio link arrangement () comprising at least two link nodes (). A first link node () is arranged to obtain first link data (X) over a first carrier frequency, and a second link node() is arranged to obtain second link data (X) over a second carrier frequency separate from the first carrier frequency. The link arrangement () further comprises a classification unit () arranged to obtain the link data (X, X) from the link nodes () and to determine if the link data (X, X) are affected by either a frequency dependent disturbance event or by a frequency independentdisturbance event. This is accomplished by comparing the first link data (X) to the second link data (X) over a time window (T). The classification unit () is also arranged to output disturbance event decision data (Y) in dependence of whether the link data (X, X) have been determined to be affected by either a frequency dependent disturbance event or a frequency independent disturbance event.

Identifying disturbance events at point to point radio links

There is provided mechanisms for transmit time adjustment. A method is performed by a second network node. The method comprises obtaining an indication of a need for transmit time adjustment with a first network node during ongoing communication with the first network node. The method comprises providing a first notification to at least one third network node to adjust its receive timing for receiving a signal from the second network node as part of ongoing communication with the second network node. The method comprises adjusting transmit timing for transmitting a first signal to the first network node as part of the ongoing communication with the first network node and for transmitting at least one second signal to the at last one third network node as part of the ongoing communication with the at least one third network node.

Methods, network nodes, and computer programs for transmit timing adjustment

The present disclosure relates to an adaptive antenna radome heating system () for a point to point radio link, where the adaptive antenna radome heating system comprises a processing unit () and at least one point to point radio link transceiver (TRX) (A,B,C). Each TRX comprises an antenna radome () having an antenna radome heating device () configured to be activated by a control signal (R, R, RN). The processing unit () is arranged to determine an onset of accumulated precipitation on the antenna radome of the at least one TRX (A,B,C) and to activate the corresponding antenna radome heating device () by the control signal (R, R, RN) in response to determining the onset of accumulated precipitation.

Antenna radome heating for point to point radio links

A method for transmit timing adjustment by a second network node includes obtaining an indication of beam link failure of a current beam that is used for ongoing communication with a first network node. The method further includes switching over to a backup beam of the current beam for continuing the ongoing communication with the first network node, and adjusting transmit timing for transmitting a signal as part of the ongoing communication in the backup beam based on earlier communicated timing information with the first network node before making any transmission of the signal on the backup beam.

Growing community of inventors

Gothenburg, Sweden

Lei Bao