Abstract: A method (300) for determining cells in which a preamble has been transmitted. The method includes obtaining (s302) N sample sets, wherein each one of the N sample sets comprises a set of M samples and each one of the N sample sets is associated with a different cell included in a set of N cells. The method also includes adding (s304) the N sample sets to create a first combined set of samples comprising M samples. The method also includes forming (s306) a first candidate set of one or more tuples based on the first combined set of samples and an initial set of tuples comprising a plurality of tuples, wherein each tuple comprises a candidate preamble and a candidate delay, and wherein each candidate preamble comprises a set of samples. The method further includes using (s308) the first candidate set of one or more tuples to determine, for each cell included in the set of cells, whether a preamble included in the first candidate set of tuples was transmitted in the cell.

Abstract: 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 NCS configuration information indicating an NCS value. The base station then receives from the terminal a random access preamble related to the NCS value indicated by the NCS configuration information. The NCS value 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.

Abstract: A RAP detection procedure that can be used to find the best narrow beam in an efficient manner. In a first step, an access point correlates an incoming signal with appropriate RAPs and then selects at least one candidate RAP for further processing in at least one set of narrow beams that all reside within the coverage area of a wide beam with which the candidate preamble is associated. For each candidate RAP, a second step is executed including narrow beamforming and a PRACH receiver chain including threshold comparison.

Abstract: An example method for transmitting a random access preamble comprises selecting (502) a random access preamble configuration from a plurality of predetermined random access preamble configurations. The method further includes determining (504) a time interval in which to transmit the random access preamble. The method further comprises transmitting (506) 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.

Abstract: 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.

Abstract: 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.

Abstract: An example method for transmitting a random access preamble comprises selecting (502) a random access preamble configuration from a plurality of predetermined random access preamble configurations. The method further includes determining (504) a time interval in which to transmit the random access preamble. The method further comprises transmitting (506) 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.

Abstract: 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.

Abstract: A method for providing motion information of a UE in a wireless communication system. The method comprises initiating, in a first network node, of a first Doppler shift measurement concerning the UE. In the first network node, a transfer of requests for second Doppler shift measurement concerning the UE is initiated to second network nodes. Data representing the first Doppler shift measurement is obtained in the first network node. Data representing the second Doppler shift measurements is obtained in the first network node. An estimated motion, in more than one dimension, of the UE is determined in dependence of at least the obtained data representing the first Doppler shift measurement and the obtained data representing the second Doppler shift measurements. A method for assisting by the second network node, as well as network nodes performing the methods are also disclosed.

Abstract: 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.

Abstract: A wireless device is configured to utilize a first carrier for accessing a communication network, the first carrier being implemented according to a first radio-access technology (RAT) and having a first transmission frequency band, the communication network further provides for network access via a second carrier, the second carrier being implemented according to a second RAT and having a second transmission frequency band, the second transmission frequency band at least partially overlaps with the first transmission frequency band. A method performed by the wireless device comprises: receiving a configuration message for the first carrier from a network node, the configuration message comprising an indication of resources in which the wireless device is configured with reference signals according to the first RAT.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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 NCS configuration information indicating an NCS value. The base station then receives from the terminal a random access preamble related to the NCS value indicated by the NCS configuration information. The NCS value 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.

Abstract: An example method for transmitting a random access preamble comprises selecting (502) a random access preamble configuration from a plurality of predetermined random access preamble configurations. The method further includes determining (504) a time interval in which to transmit the random access preamble. The method further comprises transmitting (506) 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.

Abstract: 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.

Abstract: 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 NCS configuration information indicating an NCS value. The base station then receives from the terminal a random access preamble related to the NCS value indicated by the NCS configuration information. The NCS value 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.