Telefonaktiebolaget Lm Ericsson (publ)

Karl Werner

Robert Baldemair

Lars Lindbom

Stefan Parkvall

Erik Bengt Dahlman

Martin Hessler

Mattias Frenne

Bengt Lindoff

Iana Siomina

Håkan Björkegren

Ning He

Henrik Asplund

Mikael Coldrey

Johan Furuskog

Martin Johansson

Niklas Johansson

Jianfeng Wang

Hai Feng Wang

Ali Behravan

Niklas Jaldén

Jonas Medbo

Henrik Sahlin

Lars Sundström

Gunnar Mildh

Icaro L J Da Silva

Johan Rune

Fredrik Gunnarsson

Jinhua Liu

Yi-Pin Eric Wang

Andres Reial

Jari Tapio Vikberg

Erik A Eriksson

Pål Frenger

Stefan Wager

Dennis Hui

Magnus Stattin

Sven Oscar Petersson

Joakim Axmon

Karl Norrman

Qianxi Lu

Qingyu Miao

Johan Torsner

Pradeepa Ramachandra

Fredrik Athley

Gabor Fodor

Kumar Balachandran

Janne Peisa

Joachim Sachs

Ali S Khayrallah

Gen Li

Claes Tidestav

Thorsten Lohmar

Zhang Zhang

Bo Hagerman

Osman Nuri Can Yilmaz

Torgny Palenius

Niclas Wiberg

Jonas Fröberg Olsson

Zhan Zhang

Peter Alriksson

Jose Luis Pradas

Andreas Bergström

Pontus Wallentin

Patrik Rugeland

Anders Furuskär

Mårten Ericson

Johan Axnäs

Patrik Torgny Karlsson

Jonas Kronander

Shehzad Ali Ashraf

Reza Moosavi

Fredrik Lindqvist

Dennis Sundman

Mikael Prytz

Håkan Axelsson

Nadia Brahmi

Yngve Selén

Andreas Cedergren

Ali El Essaili

Elena Myhre

Emma Wittenmark

Hugo Tullberg

Jörg Huschke

Virgile Garcia

Lars Manholm

Ulf Gustavsson

Thomas Walldeen

Ke Wang Helmersson

Peter Von Wrycza

Rui Fan

Walter Müller

Stephen J Grant

Edgar Ramos

Andreas Nilsson

Johan Nilsson

Bo Lincoln

Anders Wallén

Sebastian Faxér

David Astely

Patrick Svedman

According to an aspect, a wireless node selects a set of reference signal antenna ports for use in transmitting data to other wireless nodes in a given transmit time interval, from a plurality of sets of reference signal antenna ports that are available for use and that include reference signal antenna ports having different reference signal densities in the frequency and/or time dimension. The wireless node sends a message to a second wireless node indicating a reference signal assignment and including an indication of the selected set of reference signal antenna ports.

Methods for adapting density of demodulation reference signals

A method, wireless device and network node are disclosed. According to one aspect, a method for a wireless device includes receiving a configuration of a reference signal resource set from the network node, the reference signal resource set being a set of single-symbol and single antenna port reference signal resources in at least one slot; and based on at least one parameter of the received configuration, determining whether the UE can assume a same antenna port for all reference signal resources of the reference signal resource set.

Methods and apparatuses for downlink tracking reference signal configuration

Methods and apparatus in a fifth-generation wireless communications, including an example method, in a wireless device, that includes receiving a downlink signal comprising an uplink access configuration index, using the uplink access configuration index to identify an uplink access configuration from among a predetermined plurality of uplink access configurations, and transmitting to the wireless communications network according to the identified uplink access configuration. The example method further includes, in the same wireless device, receiving, in a first subframe, a first Orthogonal Frequency-Division Multiplexing (OFDM) transmission formatted according to a first numerology and receiving, in a second subframe, a second OFDM transmission formatted according to a second numerology, the second numerology differing from the first numerology. Variants of this method, corresponding apparatuses, and corresponding network-side methods and apparatuses are also disclosed.

Network architecture, methods, and devices for a wireless communications network

A method, network node and wireless device in a wireless communication system for one of transmitting and receiving a phase-tracking reference signal, PT-RS. The method includes obtaining information about a position in a time domain of a scheduled first demodulation reference signal, DM-RS, in a slot, and one of transmitting and receiving the PT-RS within the slot, the position of the PT-RS depending on the position in the time domain of the scheduled first DM-RS.

Joint resource map design of DM-RS and PT-RS

Method and one or more first devices for supporting calibration of a multi-antenna array comprised in a first antenna device operative with a wireless communication network. The first device(s) provide phase correcting information, to be used in calibration of the multi-antenna array, based on covariances corresponding to recurrent displacement vectors of the multi-antenna array. Said covariances being based on channel estimates estimated from certain radio signals received after transmission over radio propagation channels between said multi-antenna array of the first antenna device and one or more second antenna devices operative with the wireless communication network.

Method and device(s) for supporting calibration of a multi-antenna array comprised in an antenna device operative with a wireless communication network

Disclosed is a method and a first transceiver of a wireless communication network, for handling reference signals. The method comprises receiving, from a second transceiver, at antenna elements of each of M antenna branches of the first transceiver and in time domain, an OFDM modulated wideband reference signal comprising an OFDM reference signal symbol mapped to every K subcarrier frequency of at least a subset of a carrier frequency bandwidth, and, at each of the M antenna branches, sampling the received wideband reference signal using N samples per OFDM symbol. The method further comprises, for each of the M antenna branches, accumulating the received, sampled wideband reference signal over at least two repetition blocks, each of length of N/K, to obtain a condensed signal with the length N/K samples and conveying the condensed signal over an interface to an aggregate unit.

Method and transceiver of a wireless communication network for handling reference signals

Methods and apparatus in a fifth-generation wireless communications network, including an example method, in a wireless device, that includes determining a reporting quality threshold for a parameter related to channel state information (CSI); performing a measurement for each of a plurality of beams from a first predetermined set of beams for evaluation; evaluating the measurement for each of the plurality of beams against the reporting quality threshold; discontinuing the performing and evaluating of measurements in response to determining that the reporting quality threshold is met for one of the beams, such that one or more beams in the first predetermined set of beams are not measured and evaluated; and reporting, to the wireless communications network, CSI for the one of the beams.

Methods and apparatus are provided for configuring a plurality of User Equipments (UEs) to communicate with a base station. In one example, a method includes determining, for each UE, a respective bandwidth based on an indication of channel quality between the UE and the base station, and configuring at least a subset of the plurality of UEs to communicate with the base station based on the respective bandwidths.

Configuring a plurality of user equipments

A method and network node for scrambling radio interference mitigation reference signals (RIM-RS) are disclosed. According to one aspect, a network node is configured to generate an initialization seed computed by linearly combining a function of a time counter t and a function of a scrambling identifier, N. The network node is further configured to generate a radio interference mitigation reference signal (RIM-RS) sequence based at least in part on the initialization seed.

Network node and method performed therein for generating a radio interference mitigation reference signal sequence

A technique for transmitting on a multiple-input channel from a transmitting device to at least one receiving device is described. As to a method of the technique, a quality of a channel estimate of the multiple-input channel from the transmitting device to the at least one receiving device is determined. A transmission on the multiple-input channel from the transmitting device to the at least one receiving device is performed. The transmission is spatially precoded using at least one precoder determined out of a set of precoders. A size of the set of precoders is an increasing or non-decreasing function of the determined quality of the channel estimate.

Technique for precoding a radio transmission

Systems and methods for coverage enhanced reciprocity-based precoding schemes are provided. In some embodiments, a method performed by a base station for determining precoding information includes: determining channel estimates for at least a channel between the wireless device and another device; determining a plurality of precoding hypotheses based on the channel estimates; determining a figure of merit for each of the plurality of precoding hypotheses; and determining the precoding information based on the figure of merit for each of the plurality of precoding hypotheses. In some embodiments, this precoding method enables the use of reciprocity-based precoding down to a lower Signal to Noise Ratio, SNR, than what existing state of the art reciprocity-based precoding can offer.

Coverage enhanced reciprocity-based precoding scheme

Growing community of inventors

Segeltorp, Sweden

Karl Werner