Abstract: Inter-alia, a method is disclosed comprising: obtaining at least two sets of sample measurements, wherein a respective set of sample measurements thereof is indicative of one or more signals that are observable by an antenna, wherein a respective set of sample measurements of the at least two sets of sample measurements is measured with a respective antenna of at least two antennas, and wherein the two antennas have a distance from one another and are comprised by or connectable to an apparatus; determining time-of-arrival, TOA, difference information indicative of a TOA difference between the at least two sets of sample measurements, wherein the TOA difference information is determined based, at least in part, on at least two sets of sample measurements, the determining comprising checking whether the TOA difference reflects said distance between the at least two antennas. Corresponding apparatus, computer program and system are further disclosed.

Abstract: Systems, methods, apparatuses, and computer program products for calibrating beam orientation errors for improved positioning. For example, certain embodiments may utilize collection of various measurements to compute, and correct for, beam orientation errors. Additionally, or alternatively, certain embodiments may collect information about propagation conditions in a network and may establish virtual anchors for the network.

Abstract: An apparatus, method and computer program is described comprising: receiving downlink positioning signals from each of a plurality of communication nodes of a mobile communication system at a user device of the mobile communication system, wherein each downlink positioning signal is received from a downlink beam direction for the respective communication node; determining an angle of arrival and/or a time of arrival for each of the received downlink positioning signals; and determining an uplink positioning signal beam configuration based, at least in part, on the determined angle of arrival and/or the determined time of arrival for said received downlink positioning signals.

Abstract: Example embodiments relate to machine learning based digital pre-distortion for power amplifiers. A device may amplify a signal with a power amplifier and transmit the signal. The signal may be received by an internal feedback receiver of the device. The device may further comprise a first machine learning model configured to emulate an external feedback receiver and to generate an emulated feedback signal based on the internal feedback signal. The device may further comprise a second machine learning model configured to determine digital pre-distortion parameters for the power amplifier based on the emulated feedback signal. Apparatuses, methods, and computer programs are disclosed.

Abstract: Methods, apparatuses, and computer programs are provided for SRS for positioning resource overhead reduction in multi-RTT. A method for a UE includes receiving an initial configuration of a plurality of sounding reference signal for positioning resources; measuring a downlink positioning reference signal received from one or more cells; determining one or more transmission beams based on reception beams used for receipt of the downlink positioning reference signal from the one or more cells; wherein the determining of the one or more transmission beams comprises a reduction of at least one beam resource associated with a sounding reference signal for positioning; and transmitting an updated sounding reference signal for positioning configuration with information about the determined one or more transmission beams. Methods are also provided for a radio node and for an LMF.

Abstract: There is provided a method in a network node, the method comprising: obtaining adjacent channel leakage ratio information on an uplink user equipment, UE, regarding first and second adjacent frequency bands, wherein the network node is configured to communicate in frequency-division duplexing mode with a plurality of UEs, comprising the uplink UE and a downlink UE, the first frequency band configured for uplink communication between the network node and the uplink UE and the second frequency band configured for downlink communication between the network node and the downlink UE; obtaining channel condition information regarding the downlink UE indicating channel condition associated with the first frequency band and channel condition associated with the second frequency band; adapting guard band between the first and second adjacent frequency bands based on the adjacent channel leakage ratio information and the channel condition information.

Abstract: A method for identifying potentially interfering devices is provided. The method may include receiving, by a first base station, an information element comprising information for identifying location of a first device with respect to the first base station, and sending a request to a second base station. The request may include location information on the basis of the received information element. The method may include receiving, in response to the request, an identifier of at least one further device, and transmitting the identifier of the at least one further device to the first device for interference measurements.

Abstract: Systems, methods, apparatuses, and computer program products for GIS-NR beamforming for mmWave. For example, certain embodiments may provide for beam realignment, through which a serving network node may be able to re-position its beam towards a UE without the UE explicitly measuring and signalling to the network node the need for realignment. Instead of performing the traditional UE-based exhaustive beam search, the serving network node may proactively switch the beam in an attempt to track the UE movements. The serving network node may do this by corroborating information from two types of sources: 1) a set of neighbor mobile or fixed network nodes and 2) a geographic information system (GIS).

Abstract: A terminal device includes a controller configured to identify a data hopping sequence for a first superframe including a plurality of frames, and a transceiver configured to switch hopping frequencies over the plurality of frames according to a data hopping sequence that excludes one or more hopping frequencies scheduled for use by a synchronization hopping sequence in one or more superframes immediately succeeding the first superframe.

Abstract: There is provided a method in a network node, the method comprising: obtaining adjacent channel leakage ratio information on an uplink user equipment, UE, regarding first and second adjacent frequency bands, wherein the network node is configured to communicate in frequency-division duplexing mode with a plurality of UEs, comprising the uplink UE and a downlink UE, the first frequency band configured for uplink communication between the network node and the uplink UE and the second frequency band configured for downlink communication between the network node and the downlink UE; obtaining channel condition information regarding the downlink UE indicating channel condition associated with the first frequency band and channel condition associated with the second frequency band; adapting guard band between the first and second adjacent frequency bands based on the adjacent channel leakage ratio information and the channel condition information.

Abstract: A method for a user equipment includes determining full duplex capability and metric thresholds during cell search or attachment to a base station and reporting these to the base station; when in an RRC-connected state, dynamically sending reports of the metric conditions to the base station; and receiving instructions, based on the reports of the metric conditions, to communicate with the base station in one of a full duplex mode and a time division duplex mode. A method for a base station includes receiving a full duplex capability and metric thresholds from a user equipment; when in an RRC-connected state, initially scheduling the user equipment for communications in a time division duplex mode; receiving reports of metric conditions dynamically from the user equipment; and sending instructions, based on the reports, to the user equipment to communicate in one of a full duplex mode and a time division duplex mode.

Abstract: According to an example aspect of the present invention, there is provided a method, comprising: receiving, by a first base station, an information element comprising information for identifying location of a first device with respect to the first base station; sending a request to a second base station, the request comprising location information on the basis of the received information element; receiving, in response to the request, an identifier of at least one further device; and transmitting, the identifier of the at least one further device to the first device for interference measurements.

Abstract: A method of estimating a channel for mobile systems with insufficient cyclic prefix length, wherein the channel comprises a plurality of multipath components (?,?), includes: receiving a signal (yn) comprising a plurality of contributions of a transmit signal (xn[k], xn-1[k]) transmitted during a plurality of transmission time intervals (n, n?1) on a plurality of sub-carriers of known pilots (k?Pb) and a plurality of sub-carriers of unknown data (k?Pb); determining an estimate of the plurality of multipath components (?,?) based on a probabilistic relation between the plurality of first contributions (xn[k], xn-1[k]) of the transmit signal, wherein the plurality of first contributions are transmitted during adjacent transmission time intervals (n, n?1), and an observation of the received signal (yn[k]) at a subcarrier (k?Pb) of the known pilots, wherein the probabilistic relation is based on statistical properties of the plurality of first contributions (xn[k], xn-1[k]) of the transmit signal.

Abstract: A method of estimating a channel for mobile systems with insufficient cyclic prefix length, wherein the channel comprises a plurality of multipath components (?,?), includes: receiving a signal (yn) comprising a plurality of contributions of a transmit signal (xn[k], xn-1[k]) transmitted during a plurality of transmission time intervals (n, n-1) on a plurality of sub-carriers of known pilots (k?Pb) and a plurality of sub-carriers of unknown data (k?Pb); determining an estimate of the plurality of multipath components (?,?) based on a probabilistic relation between the plurality of first contributions (xn[k], xn-1[k]) of the transmit signal, wherein the plurality of first contributions are transmitted during adjacent transmission time intervals (n, n-1), and an observation of the received signal (yn[k]) at a subcarrier (k?Pb) of the known pilots, wherein the probabilistic relation is based on statistical properties of the plurality of first contributions (xn[k], xn-1[k]) of the transmit signal.

Abstract: A method (200) for channel estimation includes receiving (201) a receive symbol (206) comprising: a plurality of interfering transmissions from: a first transmit symbol (202), the first transmit symbol (202) comprising a plurality of unknown modulated symbols interleaved with a plurality of known modulated symbols and a second transmit symbol (204), the second transmit symbol (204) comprising a plurality of unknown modulated symbols interleaved with a plurality of known modulated symbols, wherein the plurality of transmissions from the first transmit symbol (202) and the second transmit symbol (204) are a plurality of transmissions of different time instances; and estimating (203) a channel based on the receive symbol (206) and a plurality of estimates of the first transmit symbol (202) and the second transmit symbol (204).

Abstract: A method for processing one or more received radio signals is provided. The method may include performing a channel estimation of a transmission channel for at least a portion of the one or more radio signals received, to identify at least one soft channel parameter representing a channel impulse response of the transmission channel, and identifying at least one soft intercarrier interference parameter representing an interference for the one or more radio signals received using a first frequency carrier. The interference is caused by the one or more radio signals received using a second frequency carrier. The method may further include detecting soft data from the one or more radio signals based at least on the at least one soft channel parameter and the at least one soft intercarrier interference parameter.

Abstract: A method for processing one or more received radio signals is provided. The method may include performing a channel estimation of a transmission channel for at least a portion of the one or more radio signals received, to identify at least one soft channel parameter representing a channel impulse response of the transmission channel, and identifying at least one soft intercarrier interference parameter representing an interference for the one or more radio signals received using a first frequency carrier. The interference is caused by the one or more radio signals received using a second frequency carrier. The method may further include detecting soft data from the one or more radio signals based at least on the at least one soft channel parameter and the at least one soft intercarrier interference parameter.

Abstract: A method (200) for channel estimation includes receiving (201) a receive symbol (206) comprising: a plurality of interfering transmissions from: a first transmit symbol (202), the first transmit symbol (202) comprising a plurality of unknown modulated symbols interleaved with a plurality of known modulated symbols and a second transmit symbol (204), the second transmit symbol (204) comprising a plurality of unknown modulated symbols interleaved with a plurality of known modulated symbols, wherein the plurality of transmissions from the first transmit symbol (202) and the second transmit symbol (204) are a plurality of transmissions of different time instances; and estimating (203) a channel based on the receive symbol (206) and a plurality of estimates of the first transmit symbol (202) and the second transmit symbol (204).

Abstract: A method includes determining a sequence of first coefficient estimates of a communication channel based on a sequence of pilots arranged according to a known pilot pattern and based on a receive signal, wherein the receive signal is based on the sequence of pilots transmitted over the communication channel. The method further includes determining a sequence of second coefficient estimates of the communication channel based on a decomposition of the first coefficient estimates in a dictionary matrix and a sparse vector of the second coefficient estimates, the dictionary matrix including filter characteristics of at least one known transceiver filter arranged in the communication channel.

Abstract: A method includes determining a sequence of first coefficient estimates of a communication channel based on a sequence of pilots arranged according to a known pilot pattern and based on a receive signal, wherein the receive signal is based on the sequence of pilots transmitted over the communication channel. The method further includes determining a sequence of second coefficient estimates of the communication channel based on a decomposition of the first coefficient estimates in a dictionary matrix and a sparse vector of the second coefficient estimates, the dictionary matrix including filter characteristics of at least one known transceiver filter arranged in the communication channel.