Abstract: A method of operating a distributed unit, DU, of a radio network node in a wireless communication system is provided. The method includes obtaining a value of an antenna subarray gain for a radio unit, RU, connected to the DU, estimating a transmission gain associated with a first downlink channel of the RU based on the antenna subarray gain, and calculating an effective isotropically radiated power, EIRP, level for the first downlink channel based on the estimated transmission gain of the first channel. The method further includes adaptively limiting EIRP of downlink signals transmitted by the RU on the first downlink channel based on the estimated transmission gain.

Abstract: A method and network node for interference-aware dimension reduction via orthonormal basis selection are disclosed. According to one aspect, a method includes determining a beamformer for each wireless device (WD), each beamformer being based at least in part on an interference covariance matrix; determining a power in each dimension reduction basis vector based at least in part on the determined beamformers; and selecting a subset of the dimension reduction basis vectors based on the determined power. A number of selected dimension reduction basis vectors is less than a number of antenna elements of the network node. The method also includes multiplying a received signal vector by a dimension reduction matrix having as rows the selected subset of the dimension reduction basis vectors. The multiplying results in a reduced signal vector having a dimension equal to the number of selected rows of the dimension reduction matrix.

Abstract: According to some embodiments, a method performed by a network node for interference aware downlink transmission includes determining a reciprocity-aided interference aware transmission precoder based on a downlink wideband interference covariance matrix estimated from a plurality of received sounding reference signals and based on a matrix inversion associated with the downlink wideband interference covariance matrix. The matrix inversion is determined based on an iterative inverse covariance estimation. The method further includes transmitting a downlink signal using the reciprocity-aided interference aware transmission precoder.

Abstract: A method, system and apparatus for network slicing in cellular systems are disclosed. According to one aspect, a network node is provided. The network node includes processing circuitry configured to determine virtual resources at least in part by logically slicing a plurality of physical resources across a spatial domain, and assign the virtual resources to a first radio bearer associated with a first wireless device.

Abstract: Embodiments of a method in a network node for resource allocation are disclosed. The method includes selecting a user set of wireless devices from available predefined user sets; estimating expected data rates for the wireless devices in the selected user set for a selected radio resource; computing a weighted sum of the expected rates of the wireless devices in the user set; and assigning a given the selected radio resource to the user set with the highest weighted sum. A criterion for dynamic resource allocation that can opportunistically exploit the channel variations towards achieving the optimal trade-off between the network capacity and wireless device-fairness is also disclosed.

Abstract: 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.

Abstract: A method, system and apparatus are disclosed. According to one or more embodiments, a network node is provided. The network node includes processing circuitry configured to determine a respective allocation priority for each of a plurality of wireless devices where each respective allocation priority is based at least on a power headroom with respect to a radio frequency, RF, electro-magnetic-field, EMF, limit and at least one performance metric for a respective wireless device of the plurality of wireless devices, and allocate resources to at least one of the plurality of wireless devices based at least on the respective allocation priorities associated with the plurality of wireless devices.

Abstract: A method, system and apparatus are disclosed. According to one or more embodiments, a network node is provided. The network node includes processing circuitry configured to determine a precoder using one of wideband channel state information and frequency-dependent channel state information based on at least one mobility estimate, and cause transmission to a wireless device using the determined precoder.

Abstract: A method and network node for interference-aware dimension reduction via orthonormal basis selection are disclosed. According to one aspect, a method includes determining a beamformer for each wireless device (WD), each beamformer being based at least in part on an interference covariance matrix; determining a power in each dimension reduction basis vector based at least in part on the determined beamformers; and selecting a subset of the dimension reduction basis vectors based on the determined power. A number of selected dimension reduction basis vectors is less than a number of antenna elements of the network node. The method also includes multiplying a received signal vector by a dimension reduction matrix having as rows the selected subset of the dimension reduction basis vectors. The multiplying results in a reduced signal vector having a dimension equal to the number of selected rows of the dimension reduction matrix.

Abstract: According to one or more embodiments, a network node is provided. The network node includes processing circuitry configured to: determine a subset of a plurality of candidate wireless devices for Multiple-Input Multiple-Output, MIMO, grouping based at least on an information carrying capacity, ICC, of a MIMO transmission to the MIMO grouping; and cause the MIMO transmission to the MIMO grouping.

Abstract: A method of operating a distributed unit, DU, of a radio network node in a wireless communication system is provided. The method includes obtaining a value of an antenna subarray gain for a radio unit, RU, connected to the DU, estimating a transmission gain associated with a first downlink channel of the RU based on the antenna subarray gain, and calculating an effective isotropically radiated power, EIRP, level for the first downlink channel based on the estimated transmission gain of the first channel. The method further includes adaptively limiting EIRP of downlink signals transmitted by the RU on the first downlink channel based on the estimated transmission gain.

Abstract: A method, system and apparatus for network slicing in cellular systems are disclosed. According to one aspect, a network node is provided. The network node includes processing circuitry configured to determine virtual resources at least in part by logically slicing a plurality of physical resources across a spatial domain, and assign the virtual resources to a first radio bearer associated with a first wireless device.

Abstract: A method, network node, wireless device and system are provided. In one or more embodiments, the network node is configured to communicate with a wireless device. The network node includes processing circuitry configured to: determine to transition the wireless device to one of a beamforming mode and non-beam forming mode, in response to the determination to transition the wireless device, modify at least one measurement report trigger associated with the wireless device, and transmit an indication of the modification of the at least one measurement report trigger to the wireless device.

Abstract: According to one aspect, a network node is provided. The network node including processing circuitry configured to: estimate a spatial spectrum associated with a plurality of wireless devices, determine active spatial directions for the plurality of wireless devices based at least on the estimated spatial spectrum, and determine Multiple User-Multiple Input Multiple Output, MU-MIMO, pairing based at least on the determined active spatial directions.

Abstract: A method and apparatus for beamspace processing in a radio access node are proposed. A channel estimate, which characterizes a radio channel between the antenna elements of an antenna array and a user equipment for a given time and a given frequency, is transformed using multiple distinct sets of spatial orthonormal basis functions to obtain transformed channel estimates. Each one of the distinct sets of spatial orthonormal basis functions defines a respective one of beamspace transformations. Based on measures of quality of beamspace transformation, a set of spatial orthonormal basis functions is selected from the sets of the spatial orthonormal basis functions to satisfy a beamspace reduction criteria for the radio channel. Data streams are encoded, based on a selected transformed channel estimate, into encoded data streams. The encoded data streams are then transmitted through the antenna elements of the antenna array.

Abstract: A method, network node, wireless device and system are provided. In one or more embodiments, the network node is configured to communicate with a wireless device. The network node includes processing circuitry configured to: determine to transition the wireless device to one of a beamforming mode and non-beam forming mode, in response to the determination to transition the wireless device, modify at least one measurement report trigger associated with the wireless device, and transmit an indication of the modification of the at least one measurement report trigger to the wireless device.

Abstract: 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.

Abstract: Embodiments of a method in a network node for resource allocation are disclosed. The method includes selecting a user set of wireless devices from available predefined user sets; estimating expected data rates for the wireless devices in the selected user set for a selected radio resource; computing a weighted sum of the expected rates of the wireless devices in the user set; and assigning a given the selected radio resource to the user set with the highest weighted sum. A criterion for dynamic resource allocation that can opportunistically exploit the channel variations towards achieving the optimal trade-off between the network capacity and wireless device-fairness is also disclosed.

Abstract: A method and apparatus for beamspace processing in a radio access node are proposed. A channel estimate, which characterizes a radio channel between the antenna elements of an antenna array and a user equipment for a given time and a given frequency, is transformed using multiple distinct sets of spatial orthonormal basis functions to obtain transformed channel estimates. Each one of the distinct sets of spatial orthonormal basis functions defines a respective one of beamspace transformations. Based on measures of quality of beamspace transformation, a set of spatial orthonormal basis functions is selected from the sets of the spatial orthonormal basis functions to satisfy a beamspace reduction criteria for the radio channel. Data streams are encoded, based on a selected transformed channel estimate, into encoded data streams. The encoded data streams are then transmitted through the antenna elements of the antenna array.

Abstract: A wireless communication device receives an indication of timing alignment of a discontinuous reception (DRX) duration, determines a timing alignment for a reception/transmission (RX/TX) switching pattern of the wireless communication device based on the timing alignment of the DRX duration, and performs half-duplex (HD) communication with a radio access node according to the RX/TX switching pattern having the determined timing alignment.