Abstract: Disclosed herein is a method for interference coordination in a split gNB architecture. The method includes receiving at a central unit gNB one or more messages from one or more distributed units. Each message that is received comprises an identification of the distributed unit that sent the message and an identification of a victim distributed unit that experienced interference. The method further includes merging the one or more messages into single merged message. The method additionally includes sending the merged message to at least the victim distributed unit.

Abstract: A method for differentiating multiple Physical Downlink Shared Channel (PDSCH) transmission schemes. In a non-limiting example, the PDSCH transmission schemes include a spatial multiplexing transmission scheme, a frequency multiplexing transmission scheme, a slot-based time multiplexing transmission scheme, and a mini-slot-based time multiplexing transmission scheme. In examples discussed herein, a User Equipment (UE) can be configured to differentiate the PDSCH transmission schemes based on information indicated in Downlink Control Information (DCI) for scheduling a PDSCH transmission, information signaled to the UE via a higher layer configuration, and/or capability signaling indicated from the UE to a network. By differentiating the PDSCH transmission schemes, the UE can efficiently receive a data transmission(s) from multiple Transmission/Reception Points (TRPs).

Abstract: There is disclosed a method of operating a network node (100) in a radio access network, the method comprising detecting Physical Random Access CHannel, PRACH, transmission from a user equipment (10), wherein the PRACH transmission covers a plurality of time intervals, wherein detecting comprises associating different weights to different time intervals. The disclosure also pertains to related devices and methods.

Abstract: A wireless device (14) is configured for reporting channel state information, CSI, feedback (18) based on a CSI reference signal, CSI-RS, (16) received on a CSI-RS resource (11) of one or more CSI-RS ports. If the wireless device (14) is not configured with a parameter that indicates, for the CSI-RS resource (11), which sets of one or more CSI-RS port indices (17) are associated with which transmission ranks (15), the wireless device (14) is configured to assume, for the CSI-RS resource (11), that certain sets of one or more CSI-RS port indices (17) are associated with certain transmission ranks (15).

Abstract: A method performed by a wireless device for transmitting a channel state information (CSI) report for a downlink channel comprises obtaining a first set of candidate frequency-domain components and determining a set of spatial-domain components. The method comprises determining a second set of candidate frequency-domain components as a subset of the first set of candidate frequency-domain components. The method comprises determining, for each spatial-domain component of the set of spatial-domain components, a spatial-domain component-specific set of frequency-domain components as a subset of the second set of candidate frequency-domain components. The method comprises transmitting, to a network node, the CSI report.

Abstract: Systems and methods are disclosed for port selection for a wireless communication system. In one embodiment, a method performed by a Radio Access Network (RAN) node comprises dividing a channel matrix of one subcarrier of a Multiple-Input-Multiple-Output (MIMO) channel between an antenna array of the RAN node and a particular User Equipment (UE) into sub-matrices. The method further comprises forming a re-ordered channel matrix as a concatenation of the sub-matrices and forming a port-sorting matrix based on eigen vector matrices and eigen value matrices obtained via Eigen Value Decompositions (EVDs) performed on channel covariance matrices for the sub-matrices. The method further comprises applying the port-sorting matrix to the re-ordered channel matrix, re-ordering column vectors in the port-sorted channel matrix based on eigen values obtained from the EVDs, and applying grouping of the re-ordered, port-sorted channel matrix and port sorting accordingly to obtain a final port-sorted channel matrix.

Abstract: Methods and apparatuses are disclosed for a closed-loop remote interference management framework. In one embodiment for a victim node, a method includes determining one of at least two messages corresponding to a closed-loop feedback for remote interference mitigation, the at least two messages comprising a first message and a second message, the first message providing a positive mitigation indication and the second message providing a negative mitigation indication, and transmitting the determined one of the at least two messages to another network node. In another embodiment for an aggressor node, a method includes receiving one of at least two messages corresponding to a closed-loop feedback for remote interference mitigation, and taking a remote interference mitigation action based on the received one of at least two messages.

Abstract: A method of transmitting an uplink transmission by a wireless device is disclosed. The method comprises a wireless device receiving signaling configuring the wireless device with a plurality of Sounding Reference Signal (SRS) resources. The wireless device subsequently receives an indication, in a physical layer downlink control channel, of a selected plurality of SRS resources selected from among the plurality of configured SRS resources and transmits a plurality of multiple-input multiple-output (MIMO) layers of a PUSCH transmission. The selected plurality of SRS resources map to respective ones of the plurality of MIMO layers and the indication of the selected plurality of SRS resources includes SRS resource indexes with a fixed order that corresponds to an order in which the SRS resources of the selected plurality of SRS resources are mapped to the MIMO layers.

Abstract: Systems and methods relating to frequency-selective Sounding Reference Signal (SRS) precoding and uplink transmission are disclosed. In some embodiments, a method of operation of a wireless device comprises transmitting SRS on a first set of frequency-domain resources, and receiving an uplink scheduling assignment for an uplink physical channel comprising a resource allocation of a second set of frequency-domain resources comprising: (a) one or more frequency-domain resources that are also included in the first set and (b) one or more frequency-domain resources that are not included in the first set. In order to form a precoded uplink channel, the method further comprises: for each frequency-domain resource in (a), applying a same precoding as applied to the SRS on the frequency-domain resource; and, for each frequency-domain resource in (b), applying a same precoding as applied to the SRS on a different frequency-domain resource. The method further comprises transmitting the precoded uplink channel.

Abstract: In some embodiments, a network (e.g., a TRP) provides to a UE information indicating that a transmitted “first” RS resource (or “RS” for short) is quasi-co-located (QCL) with a scheduled transmission for the UE (e.g., a “second” RS). The UE may then receive the scheduled transmission under an assumption that the scheduled transmission (e.g., a second RS, such as a demodulation RS (DMRS)) is QCL with the first RS. The UE may receive such QCL information before, after or while receiving the first RS.

Abstract: 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, NID. 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.

Abstract: A method performed by a wireless device for transmitting a channel state information (CSI) report for a downlink channel comprises obtaining a first set of candidate frequency-domain components and determining a set of spatial-domain components. The method comprises determining a second set of candidate frequency-domain components as a subset of the first set of candidate frequency-domain components. The method comprises determining, for each spatial-domain component of the set of spatial-domain components, a spatial-domain component-specific set of frequency-domain components as a subset of the second set of candidate frequency-domain components. The method comprises transmitting, to a network node, the CSI report.

Abstract: A method (1400) performed by a wireless device (200) for multibeam precoder based channel state information, CSI, feedback reporting is provided, A CSI report comprises a first part, CSI Part 1, and a second part, CSI Part 2. The method {1400) comprises generating (1401) the CSI report, wherein the CSI Part 1 comprises an indication of a number of non-zero coefficients, and a payload size of the indication of the number of non-zero coefficients is dependent on a rank restriction of the wireless device. The method also comprising transmitting (1402) the CSI report to a network node, wherein one or more of a payload of the CSI Part 2 and a payload size of the CSI Part 2 is based on the number of non-zero coefficients indicated in the CSI Part 1.

Abstract: Embodiments include methods, by a user equipment (UE), for receiving physical data channel transmissions from a wireless network. Such methods include receiving, from the wireless network, configuration information including: a first indication of one or more frequency-domain resource allocations for respective corresponding one or more physical data channel transmissions by respective corresponding one or more sources configured by the wireless network, and one or more second indications of further characteristics of the physical data channel transmissions. Such methods also include, based on the second indications, determining the number of frequency-domain resource allocations indicated by the first indication. Such methods also include receiving, from the wireless network, the determined number of physical data channel transmissions based on the respective indicated frequency-domain resource allocations.

Abstract: A method performed by a wireless device (510, 800, 1200) for reporting channel state information (CSI) for a downlink channel is disclosed. The method comprises transmitting (601, 705) a CSI report for the downlink channel to a network node (560, 1100), the CSI report comprising: a set of reported coefficients; an indication of how the network node is to interpret the set of reported coefficients; and an indication of a payload size of the set of the reported coefficients.

Abstract: There is disclosed a method of operating a transmitting network node in a radio access network, the method comprising transmitting, based on determined presence of BS-to-BS interference, first reference signaling, the first reference signaling indicating that the transmitting network node is a victim node of the BS-to-BS interference. The disclosure also pertains to related devices and methods.

Abstract: A User Equipment (UE) receives, from a network node, codebook subset restriction (CBSR) signaling comprising a bitmap. The bitmap comprises a plurality of sets and each set comprises a plurality of bits. Each of the bits indicates whether a respective vector in a first set of vectors is restricted. Each set of bits indicates whether a respective vector in a second set of vectors is restricted. The UE restricts precoders selectable from a plurality of codebooks based on either a first vector in the first set of vectors or a second vector in the second set of vectors being indicated as restricted.

Abstract: A method performed by a wireless device (510, 700, 1100) is disclosed. The wireless device obtains (601) a configuration for a sub-band channel quality indicator (CQI) granularity and a sub-band precoding matrix indicator (PMI) granularity for the wireless device. The wireless device determines (602) channel state information (CSI) feedback according to the configured sub-band CQI granularity and the sub-band PMI granularity. The sub-band PMI granularity corresponds to a first sub-band size and the sub-band CQI granularity corresponds to a second sub-band size. The first sub-band size is smaller than the second sub-band size. The wireless device transmits (603), to a network node (560, 1000), the determined CSI feedback.

Abstract: A method for differentiating multiple Physical Downlink Shared Channel (PDSCH) transmission schemes for transmission of data for an over-the-top (OTT) service. In a non-limiting example, the PDSCH transmission schemes include a spatial multiplexing transmission scheme, a frequency multiplexing transmission scheme, a slot-based time multiplexing transmission scheme, and a mini-slot-based time multiplexing transmission scheme. In examples discussed herein, a User Equipment (UE) can be configured to differentiate the PDSCH transmission schemes based on information indicated in Downlink Control Information (DCI) for scheduling a PDSCH transmission, information signaled to the UE via a higher layer configuration, and/or capability signaling indicated from the UE to a network. By differentiating the PDSCH transmission schemes, the UE can efficiently receive a data transmission(s) from multiple Transmission/Reception Points (TRPs) to obtain user data from the OTT service.

Abstract: Systems and methods for Channel State Information (CSI) feedback for multiple Transmission Points (TRPs) in a cellular communications network are disclosed. Embodiments of a method of operation of a wireless device and corresponding embodiments of a wireless device are disclosed. In some embodiments, a method performed by a wireless device for CSI feedback comprises receiving a configuration comprising N Non-Zero Power (NZP) CSI Reference Signal (CSI-RS) resources each associated with a different one of N TRPs or N sets of NZP CSI-RS resources each associated with a different one of the N TRPs. The method further comprises receiving a request for CSI feedback based on the configuration, selecting a preferred subset of the NZP CSI-RS resources comprised in the N NZP CSI-RS resources or the N sets of NZP CSI-RS resources, and reporting, to a base station, CSI based on the selected preferred subset of the NZP CSI-RS resources.