Telefonaktiebolaget Lm Ericsson (publ)

Svante Bergman

David Hammarwall

George Jöngren

Niklas Wernersson

Sebastian Faxér

Jonas Fröberg Olsson

Martin Hessler

Mattias Frenne

Erik A Eriksson

Jonas B Karlsson

Magnus Hurd

Amr El-Keyi

Zhiming Yin

Jinhua Liu

Pål Frenger

Stefano Sorrentino

Torbjörn Wigren

Chandra Sekhar Bontu

Zhang Zhang

Shaohua Li

Jan Christoffersson

Lars Lindbom

Zhan Zhang

Henrik Asplund

Fredrik Nordström

Sara Sandberg

Fredrik Ovesjö

Niklas Jaldén

Per Burström

Eleftherios Karipidis

Yongquan Qiang

Nima Seifi

Jing Rao

Jagadish Ghimire

Päl Frenger

Ping Wu

Per Bergström

A network node, computer program product, and a method by a network node to allocate at least two beams in a slot to schedule multiple user equipments, UEs, are provided. Each UE is allocated to a baseband port of a plurality of baseband ports such that there is more than one UE allocated to each baseband port. For each baseband port of the plurality of baseband ports: the baseband port is mapped to a polarization of an antenna having multiple polarizations and to one beam of a plurality of beams. The polarization of a baseband port is switched in a time domain to create time diversity of services towards the multiple UEs, wherein a UE is subject to a first polarization for a subset of time occasions and to a second polarization for other time occasions.

Polarization diversity in time-domain beamforming

A method and network node for single user multiple input multiple output (SU-MEMO) codebook-based precoder selection and for rank adaptation are provided. According to one aspect, a method includes, for each one of a plurality of rank hypotheses: selecting a precoder matrix based on an uplink transmit covariance matrix; and estimating a respective information carrying capacity, ICC, for the rank hypothesis based at least in part on the selected precoder matrix. The method further includes selecting an uplink SU-MIMO precoding matrix based at least in part on the estimated ICC for each rank hypothesis.

Uplink single user multiple input multiple output (SU-MIMO) precoding in wireless cellular systems

A method for time-domain allocation of radio resources in a communication system using beamforming comprises obtaining of a list of wireless devices to be served. Subcarriers and beam directions of a multi-directional beamform are allocated to wireless devices of the list. The beam direction for each wireless device covers a position of that wireless device. The number of allocable subcarriers is limited to fulfil a beam-forming power constraint. This beam-forming power constraint is that the total power of allocated subcarriers, when each allocated subcarrier provides a same effective isotropic radiated power density for a wireless device as would be provided by a single-directional beamform, is within a predetermined power budget.

Method and devices for communication utilizing beamforming

A method and a device for sending parameters of a precoder in a wireless communication system are disclosed. According to one aspect, the method comprises: sending, to a network node, an indication of a subset of beams selected from a plurality of orthogonal beams and an indication of power levels of the selected subset of beams, for a first frequency granularity; and sending, to the network node, an indication of phases of the selected subset of beams, for a second frequency granularity, wherein the indication of the selected beams, the indication of the power levels of the selected subset of beams and the indication of the phases of the selected subset of beams are part of the parameters of the precoder.

Methods and devices for determining precoder parameters in a wireless communication network

Uplink radio transmissions () from a radio device () are scheduled by allocating radio resources for the uplink radio transmissions () and controlling a transmit power of the uplink radio transmissions (). Depending on a bandwidth of radio resources to be allocated for an uplink radio transmission () and a current value of the transmit power, an estimate of the signal-to-noise ratio of the uplink radio transmission () is determined. The estimate of the signal-to-noise ratio is compared to at least one of the lower target and the upper target. Depending on a result of the comparison, the bandwidth is adapted, and radio resources for the uplink radio transmission () are allocated in accordance with the adapted bandwidth.

Uplink scheduling based on upper and lower SNR targets

A method, base station and user equipment are disclosed. A base station configured to communicate with a plurality of user equipments is provided. The base station includes processing circuitry configured to: track a downlink signal subspace for each UE of the plurality of UEs, and determine a Multi-User Multiple-Input Multiple-Output, MU-MIMO, precoders based on the downlink signal subspace for each UE of the plurality of UEs. The MU-MIMO precoders are configured to at least in part suppress intra-cell MU-MIMO interference.

Adaptive downlink multi user multiple input multiple output (MU-MIMO)precoding using uplink signal subspace tracking for active antenna systems AAS

Methods, apparatus and computer programs are disclosed for controlling the output of a transmission point for a wireless communications network. One embodiment provides a method for controlling the output of a transmission point for a wireless communications network. The method comprises determining an average output power of the transmission point over a period of time; comparing the average output power to an output power reference value; and allocating data, to be transmitted by the transmission point to one or more wireless devices, to a pool of radio resources. The pool of radio resources is adjusted as a function of the comparison between the average output power and the output power reference value, and the output power reference value varies as a function of a maximum antenna gain of an antenna array of the transmission point during the period of time.

Controlling transmitter output

A method of operating a UE includes obtaining an interference measurement (IM) resource, performing an interference measurement using the IM resource, obtaining a time reference associated with the interference measurement, determining that the interference measurement represents a non-typical level of interference, and transmitting an indicator indicating the time reference to a network node. Related nodes, devices and computer program products are disclosed.

Systems and methods for handling non-typical interference in wireless communications networks

There is disclosed a method for operating a transmitting node of a wireless communication network, the transmitting node being adapted for a plurality of beamforming states, wherein the method comprises transmitting reference signaling based on a beamforming state of the transmitting node. There are also disclosed related nodes and methods.

Reference signaling for beamforming networks

A radio node in a wireless communication system employs multiple different candidate formats that define different possible positions of decoding checks within a transport block of a specific size. The radio node determines, from these different candidate formats, a format that defines a position of decoding checks within a transport block to be encoded or decoded. The radio node then encodes or decodes at least a portion of the transport block based on the determined format.

Check positions within a transport block

Some embodiments provide a method in a wireless device for reporting channel state information, CSI, for a CSI process. The CSI process corresponds to a reference signal resource and an interference measurement resource. According to the method, the wireless device obtains an adjustment value associated with the CSI process. The wireless device estimates an effective channel based on one or more reference signals received in the reference signal resource, and applies the adjustment value to the estimated effective channel, thereby obtaining an adjusted effective channel. Furthermore, the wireless device determines channel state information based on the adjusted effective channel, and on interference estimated based on the interference measurement resource. Finally, the channel state information is transmitted to a network node.

Methods and arrangements for CSI reporting

A coordinated multipoint (CoMP) controller coordinates transmission from a CoMP cluster to a wireless communication device. The CoMP controller determines, from among multiple different coordination hypotheses for how to coordinate transmissions from the CoMP cluster to the wireless communication device, a coordination hypothesis to apply. The CoMP controller applies the determined coordination hypothesis to transmissions from the CoMP cluster on channel state information (CSI) radio resources on which the wireless communication device is to perform CSI measurements. Notably, though, the CoMP controller defers applying the determined coordination hypothesis to transmissions from the CoMP cluster on user data radio resources, until after the determined coordination hypothesis is applied to the transmissions on the CSI radio resources.

Coordinated multi-point (CoMP) transmission from a CoMP cluster

A technique for transmitting discovery-related signals from a transmission point to a UE is disclosed, wherein the transmission point (TP) is adapted to transmit at least two distinct discovery-related signals to be received by the UE. A method aspect (in the TP) comprises transmitting the first discovery-related signal by applying a first beamforming, and transmitting the second discovery-related signal by applying a second beamforming, wherein the steps of transmitting are performed simultaneously in a time domain and/or a space domain, and wherein the first and second beamforming are different. A further method aspect (in the UE) comprises detecting, in the received discovery-related signalling, at least one discovery-related signal in at least the first beam and/or the second beam from the transmission point based on a received distinction between discovery-related signals on the first beam or the second beam, wherein the first beam is different from the second beam.

Technique for transmitting discovery-related signals from a transmission point to a user equipment

A system and method for providing an eNodeB with the flexibility to configure a Channel State Information (CSI) report to match a specific Coordinated Multipoint (CoMP) transmission hypothesis, which is a candidate for a downlink transmission to a User Equipment (UE) is disclosed. A UE receives, from the eNodeB, a configuration message that specifies a CSI report. The CSI report is specified by a particular interference hypothesis and a particular desired signal hypothesis corresponding to data transmission over at least one effective channel characterized by a specific reference signal. The UE estimates interference according to the interference hypothesis, and/or estimates at least one effective channel by performing measurements on the specific reference signal, and determines a CSI report based on the interference estimation and on the estimated effective channel. The UE also transmits the CSI report to the eNodeB.

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Hägersten, Sweden

Svante Bergman