Telefonaktiebolaget Lm Ericsson (publ)

Yezi Huang

Chenguang Lu

Boris Dortschy

Miguel Berg

Erik Bengt Dahlman

Lei Bao

Per-Erik Eriksson

Magnus Åström

Behrooz Makki

Robert Baldemair

Oumer Teyeb

Niklas Wernersson

Elmar Trojer

Filip Barac

Ajmal Muhammad

Eduardo Lins De Medeiros

Thomas Magesacher

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

The present disclosure relates in general to cellular radio network communication. In one of its aspects, the technology presented herein concerns a method performed by a network node in a wireless communication system for handling resource configurations for network nodes in an Integrated Access and Backhaul (IAB) network. The network node is connected to a core network of the wireless communications system and to at least one radio network node. The method includes providing, to a first radio network node and to at least one second radio network node, a message indicating a resource configuration for the first radio network node. The at least one second radio network node is a parent node to the first radio network node and the first radio network node is a child node to the at least one second radio network node.

Network nodes and methods for handling resource configurations

Disclosed is a method performed by a first radio unit, RU, of a distributed base station system. The distributed base station system further comprises a Baseband Unit, BBU, connected to the first RU over a fronthaul link and a second RU connected to the first RU over an RU link. The first RU determines first part of beamforming weights that it uses for performing a first part of the beamforming of uplink signals received at its antennas into intermediate signals. The first RU further determines intermediate beamforming weights to be used for a second part of beamforming at the BBU. The first RU further receives, from the second RU, intermediate signals and intermediate beamforming weights determined by the second RU. The first RU combines the intermediate signals and sends them to the BBU. The first RU further combines the intermediate beamforming weights and sends them to the BBU.

Methods, baseband unit system and radio unit of a distributed base station having cascade-coupled radio units

There is disclosed a method of operating an Integrated Access and Backhaul (IAB) node (, C, N) in a radio access network, the IAB node (, C, N) being connected to a first parent IAB node (, N, P) via a first backhaul link having a first timing, and being connected to a second parent IAB node (, N, P) via a second backhaul link having a second timing, the IAB node (, C, N) providing a communication link for access or backhaul, the communication link having a communication timing based on the first timing and the second timing. The disclosure also pertains to related methods and devices.

IAB downlink timing

Methods and apparatus are provided for determining timing of resources in an integrated access and backhaul, IAB, node (). In one example, a method (), is performed by an integrated access and backhaul, IAB, node (), the method comprising: determining (s) one or more timing offset for a time resource, the offset being in relation to a mobile termination, MT, and a distributed unit, DU, resource of the IAB node, and providing (s) to a parent IAB node (), information related to the one or more timing offset of the IAB node.

Integrated access and backhaul node resource timing

According to some embodiments, an integrated access and backhaul, IAB, network node comprises an IAB distributed unit, DU, and an IAB mobile termination, MT. A method performed by the IAB network node comprises receiving an availability indication at the IAB-MT, determining an IAB-DU soft resource availability based on the received availability indication, and transmitting or receiving according to the determined IAB-DU soft resource availability.

IAB soft resource availability determination

Disclosed is a method performed by a BBU system of a wireless communication network, comprising a distributed base station system (), which comprises a BBU () and an RRU () connected over a fronthaul link (). The method comprises determining first and second parts of beamforming weights based on a determined downlink channel estimate, and compressing the second part of the beamforming weights. The first part of the beamforming weights is determined for performing interference cancellation between user-layer signals, and the second part is determined for expanding the user-layer signals to antenna signals. The BBU then sends the first part and the compressed second part of the beamforming weights to the RRU, as well as the user-layer signals, over the fronthaul link (). The RRU () then beamforms the user-layer signals according to the first and the second parts of the beamforming weights before sending the signals to a number of UEs ().

Methods, distributed base station system, remote radio unit and base band unit system for handling downlink signals

A method performed by a distributed base station system of a wireless communication network. The distributed base station system comprises a base band unit (BBU) and a remote radio unit (RRU) connected to each other over a fronthaul link. The method comprises receiving uplink signals at N antennas of the RRU from a number of user equipment (UEs) connected to the RRU. The BBU determines first beamforming weights based on a first reference signal that is has received from the UEs and sends the first beamforming weights to the RRU. The RRU then determines intermediate signals from the first beamforming weights and the uplink signals and sends the intermediate signals to the BBU. The BBU then determines second beamforming weights from a second reference signal it has received from the RRU. Then, the BBU determines an output signal based on the intermediate signal and the second beamforming weights.

Methods, distributed base station system, remote radio unit and base band unit system for handling uplink signals

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

Disclosed is a method performed by a RRU of a distributed base station system of a wireless communication network, the RRU being connected to a BBU over a fronthaul link, the RRU being connected to N antennas. The method comprises obtaining uplink signals as received at the antennas from UEs wirelessly connected to the RRU, and obtaining a channel estimation matrix of wireless communication channels between UEs and the antennas. The method further comprises determining an error estimation matrix based on the channel estimation matrix, and on received reference signals y, the received reference signals having L symbols, L being smaller than N, determining intermediate signals, based on the uplink signals, the channel estimation matrix and the error estimation matrix, and sending to the BBU over the fronthaul link, the determined intermediate signals.

Methods, remote radio units and base band units of a distributed base station system for handling uplink signals

A method, performed by a first node (). The method is for handling access to a communications network () in a multi-hop deployment. The first node receives (), from a fourth node (), information. The information indicates a recommendation on which node within radio range to connect to, out of a plurality of candidate parent nodes (). The plurality comprises a first set () and a second set () of candidate parent nodes. A third node () is enabled to be a donor node in the first set (). A sixth node () is enabled to be a donor node in the second set (). The first node also determines (), out of the plurality, a second node () to establish a connection with. The determining () is based on the received information. The first node then initiates () establishment of a connection or re-connection to the network via the second node (), as first-hop.

First node, fourth node and methods performed thereby for handling access to a communications network in a multi-hop deployment

There is provided mechanisms for processing uplink signals. A method is performed by a RRU (). The method comprises obtaining uplink signals (S) as received from wireless devices at antenna elements of an antenna array of the RRU (), each wireless device being associated with its own at least one user layer. The method comprises capturing (S) energy per user layer by combining the received uplink signals from the antenna array for each user layer into combined signals, resulting in one combined signal per user layer. The combining for each individual user layer is based on channel coefficients of the wireless device associated with said each individual user layer. The method comprises providing (S) the combined signals to a BBU ().

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Täby, Sweden

Yezi Huang