Telefonaktiebolaget Lm Ericsson (publ)

Huawei Technologies Co., Limited

Nokia Corporation

Nokia Networks Oy

Lenovo Innovations Limited (hong Kong)

Oskar Mauritz

Branislav M Popovic

Fredrik Huss

Jaap Van De Beek

Robert Baldemair

Andres Reial

Henrik Sahlin

Torbjörn Wigren

Jacob Österling

Jonas B Karlsson

Christer Östberg

Jan Roxbergh

Guoqiang Lu

Henrik Back

Alex Stephenne

Håkan Björkegren

Yang Zhang

Stefan Parkvall

Daniel Chen Larsson

Rui Fan

Henning Wiemann

Joakim Axmon

Lars Lindbom

Gary Boudreau

Ying Sun

Fredrik Ovesjö

Magnus Larsson

Tomas Lagerqvist

Franz Heiser

Magnus Hurd

Mats Åhlander

Mattias Wennstrom

Lars Näslund

Daniel Larsson

Luke Williams

Peter Bengtsson

Margaretha Forsgren

Eva Margaretha Forsgren

Branishlav Popovic

Olof Sjöbergh

Lars Roselius

A method performed in a network node for configuring UE with dynamic spectrum sharing between a first RAT and a second RAT in a wireless communications system is disclosed. The network node configures an initial bandwidth part, BWP, for a UE, spanning across a dedicated spectrum for the first RAT and a shared spectrum between the first and second RATs, wherein synchronization signals of the first RAT are configured in the dedicated spectrum, and at least some other signals of the first RAT are configured in both dedicated and shared spectrum. The first RAT is NR and the second RAT is LTE.

Network node and method for dynamic spectrum sharing between radio access technologies

There is provided mechanisms for determining time-of-arrival of a PRACH preamble. A method is performed by a radio access network node. The radio access network node is configured for beamformed communication in a set of beams. The method comprises receiving, from a UE and at a TRP of the radio access network node, a PRACH preamble. The method comprises determining a weight factor value for the PRACH preamble. The weight factor value is dependent on beam information mapped to the PRACH preamble. The beam information identifies one of the beams in the set of beams. The method comprises determining time-of-arrival of the PRACH preamble using hypothesis testing that incorporates the weight factor value.

Time-of-arrival determination of a PRACH preamble

Random access preamble detection for propagation delay is described herein. The proposed solution predicts energy levels for a set of hypotheses, compares the predicted energy with measured energy, and selects the hypothesis that minimizes a cost function based on the difference of the predicted energy and the measured energy. Some embodiments of the proposed solution may make it possible to extend cell range by allowing a maximum round-trip time exceeding the period of the random access preamble sequence. For the long preamble formats for Long Term Evolution (LTE) and New Radio (NR), the cell range may be extended beyond 120 kilometers (km). For millimeter wave applications, the cell range may be extended beyond 2.5 km.

Random access preamble detection for propagation delay

A method and apparatus are disclosed for LTE-NR spectrum sharing. In one embodiment, a method for a wireless device (WD) includes obtaining a configuration of at least one reference signal of a first radio access technology that overlaps in time with a Multimedia Broadcast Multicast Service Single Frequency Network, MBSFN, subframe of a second radio access technology. In another embodiment, a method for a network node includes configuring at least one reference signal of a first radio access technology to overlap in time with a MBSFN subframe of a second radio access technology.

MBSFN subframe usage for LTE-NR spectrum sharing

An example method for transmitting a random access preamble comprises selecting () a random access preamble configuration from a plurality of predetermined random access preamble configurations. The method further includes determining () a time interval in which to transmit the random access preamble. The method further comprises transmitting () the random access preamble according to the selected random access preamble configuration. Each of the plurality of random access preamble configurations comprises a combination of (a) a single root sequence from a predetermined set of one or more root sequences, (b) a single cyclic shift of a predetermined plurality of cyclic shifts for the root sequence, and (c) a single starting position of two or more predetermined starting positions within time intervals allocated for random access preamble transmission.

Random access preamble slot allocation

A communication method performed by a base station in a wireless communication network is disclosed. The base station notifies a terminal of a cyclic shift increment Nconfiguration information indicating an Nvalue. The base station then receives from the terminal a random access preamble related to the Nvalue indicated by the Nconfiguration information. The Nvalue belongs to a set of cyclic shift increments including all of the following cyclic shift increments of 0, 13, 15, 18, 22, 26, 32, 38, 46, 59, 76, 93, 119, 167, 279, and 419.

Random access preamble design

Methods, devices and computer programs for determining new transmit directions to use for beamformed transmissions in case the link quality of an existing direction falters. A transmitting communication device and a receiving communication device cooperate via a beam tracking procedure to determine a new suitable transmit direction to use for upcoming beamformed transmissions. Information relating to the beam tracking procedure is communicated over an existing link that enables communication between the transmitting and receiving communication devices. The receiving communication device provides the transmitting communication device with information about a beam scan performed in order to detect tracking beams transmitted by the transmitting communication device. This information allows the transmitting communication device to determine suitable transmit directions to use.

Methods and devices for determining suitable transmit directions for beamformed transmission

Methods, network nodes and wireless devices for determining a virtual cell index field length. According to one aspect, a method of determining a length of a virtual cell index field to be transmitted with downlink control information, DCI, is performed where the virtual cell index field length for transmitting a virtual cell index to a wireless device is dynamically settable. The method includes determining a number of configured virtual cell identities, ID. The method includes transmitting the configured virtual cell identities to the wireless device. When a number of configured virtual cell IDs is greater than one, the method includes selecting a virtual cell index corresponding to a particular one of the virtual cell IDs and setting the virtual cell index field length based on the number of virtual cell IDs. The method includes transmitting the selected virtual cell index in the virtual cell index field to the wireless device.

Combined layer 3 and downlink control information (DCI) signaling of virtual cell id

There is presented mechanisms for providing information for determining beamforming weights or decoding user data for terminal devices. A method is performed by an RE of an access node. The RE has an interface to an REC of the access node. The method comprises obtaining information from the terminal devices to be used by the REC for determining the beamforming weights or decoding the user data. The method comprises selecting, according to a selection criterion, a part of the information to be provided to the REC in order for the REC to determine the beamforming weights or decode the user data based on the selected part of the information. The method comprises providing the selected part of the information to the REC over the interface.

Methods and devices for determination of beamforming information

A method can be used for facilitating a random access procedure between a first transceiver and a second transceiver within a cell. The first transceiver selects a signature sequence from a set of signature sequences, incorporates the signature sequence into a signal, and transmits the signal to the second transceiver. The set of signature sequences being obtained from a sequence with zero correlation zone.

Method, apparatus and system for random access

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Johanneshov, Sweden

Oskar Mauritz