Abstract: A method and a device for determining parameters of a precoder in a wireless communication system are disclosed. According to one aspect, a method includes selecting a subset of beams corresponding to a plurality of orthogonal beams; obtaining power levels of the selected subset of beams for generating a first factor of the precoder and obtaining phases of the selected subset of beams for generating a second factor, wherein the first factor and the second factor are part of the parameters of the precoder.

Abstract: A technique for transmitting discovery-related signals from a transmission point to a UE is disclosed, wherein the transmission point (TP) is adapted to transmit at least two distinct discovery-related signals to be received by the UE. A method aspect (in the TP) comprises transmitting the first discovery-related signal by applying a first beamforming, and transmitting the second discovery-related signal by applying a second beamforming, wherein the steps of transmitting are performed simultaneously in a time domain and/or a space domain, and wherein the first and second beamforming are different. A further method aspect (in the UE) comprises detecting, in the received discovery-related signalling, at least one discovery-related signal in at least the first beam and/or the second beam from the transmission point based on a received distinction between discovery-related signals on the first beam or the second beam, wherein the first beam is different from the second beam.

Abstract: A method performed by a network node (110) for estimating a convergence time of interference processing in a user equipment, UE (121), served by the network node (110) in a radio communications network (100) is provided. The network node has at least one Channel State Information, CSI, process configured for the UE. The network node receives, from the UE, at least one first CSI report based on signals transmitted on interference measurement resources of a first CSI process of the UE, wherein the first CSI process is in a first interference state. The network node then switches the first CSI process from the first interference state to a second interference state. After the switch, the network node receives, from the UE, at least one second CSI report based on signals transmitted on the interference measurement resources of the first CSI process of the UE, wherein the first CSI process is in the second interference state.

Abstract: A method and a device for determining parameters of a precoder in a wireless communication system are disclosed. According to one aspect, a method includes selecting a subset of beams corresponding to a plurality of orthogonal beams; obtaining power levels of the selected subset of beams for generating a first factor of the precoder and obtaining phases of the selected subset of beams for generating a second factor, wherein the first factor and the second factor are part of the parameters of the precoder.

Abstract: A method implemented in a user equipment (UE) includes receiving a first reference signal (RS) from a first transmit antenna port and performing channel estimation based on the first RS. The method also includes obtaining an indication that the first RS and a second RS share a spatial property and receiving the second RS from a second transmit antenna port. The method further includes inferring the shared spatial property for the second RS based on the indication and performing channel estimation based on the second RS using the inferred spatial property.

Abstract: A method for indicating parameters of a precoder from a wireless device to a network node in a wireless communication system is provided. The method comprises: determining at least one rotation factors associated with a plurality of orthogonal beams; selecting a subset of beams from the plurality of orthogonal beams; and sending, to the network node, the selected subset of beams and the at least one rotation factors, wherein the selected subset of beams and the at least one rotation factors are part of the parameters of the precoder. A wireless device for carrying out this method is also provided.

Abstract: A transmitting radio node precodes a transmission from an antenna array to a receiving radio node. The array includes co-polarized antenna elements aligned in a given spatial dimension of the array. The transmitting radio node precodes the transmission from different subarrays of the antenna elements using respective coarse-granularity precoders that are factorizable from a multi-granular precoder targeting the given spatial dimension of the array at different granularities, so as to virtualize the subarrays as different auxiliary elements. The transmitting radio node also precode the transmission from the different auxiliary elements using one or more finer-granularity precoders that are also factorizable from the multi-granular precoder.

Abstract: A method at a wireless device for determining parameters of a precoder to a network node, in a wireless communication system, is provided. The method comprises: selecting a subset of beams from a plurality of orthogonal beams, the selected subset of beams having phases; quantizing the phases of the selected subset of beams, the quantization being beam dependent; and sending the selected subset of beams and the quantized phases to the network node, wherein the selected subset of beams and the quantized phases are part of the parameters of the precoder. A wireless device for carrying out this method is also provided.

Abstract: Systems and method of reducing interference in a wireless communication system are provided. In one exemplary embodiment, a method by a wireless device (105, 200, 300a, 300b, 500, 1105, 1205, 1207) comprises determining (409, 909) an uplink precoder (107) based on channel measurements on first and second downlink reference signal resources. Further, the precoder enables a transmission (113) on an uplink reference signal resource that is precoded with the uplink precoder and that is quasi co-located (QCL) (121) with a transmission (111) on the first downlink reference signal resource but not QCL (123) with a transmission (115) on the second downlink reference signal resource.

Abstract: A radio node (52) in a wireless communication system (10) employs multiple different candidate formats (22) that define different possible positions of decoding checks (24) within a transport block of a specific size. The radio node (52) determines, from these different candidate formats (22), a format that defines a position of decoding checks (24) within a transport block (16) to be encoded or decoded. The radio node (52) then encodes or decodes at least a portion of the transport block (16) based on the determined format.

Abstract: There is disclosed a method for operating a transmitting node of a wireless communication network, the transmitting node being adapted for a plurality of beamforming states, wherein the method comprises transmitting reference signaling based on a beamforming state of the transmitting node. There are also disclosed related nodes and methods.

Abstract: A system and method for providing an eNodeB with the flexibility to configure a Channel State Information (CSI) report to match a specific Coordinated Multipoint (CoMP) transmission hypothesis, which is a candidate for a downlink transmission to a User Equipment (UE) is disclosed. A UE receives, from the eNodeB, a configuration message that specifies a CSI report. The CSI report is specified by a particular interference hypothesis and a particular desired signal hypothesis corresponding to data transmission over at least one effective channel characterized by a specific reference signal. The UE estimates interference according to the interference hypothesis, and/or estimates at least one effective channel by performing measurements on the specific reference signal, and determines a CSI report based on the interference estimation and on the estimated effective channel. The UE also transmits the CSI report to the eNodeB.

Abstract: A transmitting radio node (10) precodes a transmission from an antenna array (12) to a receiving radio node (50). The array (12) includes co-polarized antenna elements (14) aligned in a given spatial dimension of the array (12). The transmitting radio node (10) precodes the transmission from different subarrays (34a, 34b) of the antenna elements (14) using respective coarse-granularity precoders that are factorizable from a multi-granular precoder targeting the given spatial dimension of the array (12) at different granularities, so as to virtualize the subarrays (34a, 34b) as different auxiliary elements (38a, 38b). The transmitting radio node (10) also precode the transmission from the different auxiliary elements (38a, 38b) using one or more finer-granularity precoders that are also factorizable from the multi-granular precoder. In this case, the coarse granularity precoders and the one or more finer-granularity precoders are represented within one or more codebooks (26) used for said precoding.

Abstract: A method and a device for determining parameters of a precoder in a wireless communication system are disclosed. According to one aspect, a method includes selecting a subset of beams corresponding to a plurality of orthogonal beams; obtaining power levels of the selected subset of beams for generating a first factor of the precoder and obtaining phases of the selected subset of beams for generating a second factor, wherein the first factor and the second factor are part of the parameters of the precoder.

Abstract: A system and method for providing an eNodeB with the flexibility to configure a Channel State Information (CSI) report to match a specific Coordinated Multipoint (CoMP) transmission hypothesis, which is a candidate for a downlink transmission to a User Equipment (UE) is disclosed. A UE receives, from the eNodeB, a configuration message that specifies a CSI report. The CSI report is specified by a particular interference hypothesis and a particular desired signal hypothesis corresponding to data transmission over at least one effective channel characterized by a specific reference signal. The UE estimates interference according to the interference hypothesis, and/or estimates at least one effective channel by performing measurements on the specific reference signal, and determines a CSI report based on the interference estimation and on the estimated effective channel. The UE also transmits the CSI report to the eNodeB.

Abstract: A transmitting radio node (10) precodes a transmission from an antenna array, which includes antenna elements arranged along at least two axes, using a main codebook which is representable as a Kronecker product of a first codebook and a second codebook, where the first codebook comprises predetermined sub-precoders and the second codebook comprises configurable sub-precoders. A receiving radio node (20) may benefit from adaptive beamforming made possible by the configurability of the main codebook, while still using a stable format, which remains valid also after reconfiguration, for the exchange of reference signals and corresponding feedback information.

Abstract: The present disclosure relates to a method performed in a network node with two or more transmission states for dynamically managing outer loop link adaptation instances for a wireless device. The method includes monitoring one or more variables, where each variable is either associated with an outer loop link adaptation instance or with a transmission state; and adapting the number of outer loop link adaptation instances based on the monitored one or more variables. The disclosure also relates to corresponding devices.

Abstract: A method for indicating parameters of a precoder from a wireless device to a network node in a wireless communication system is provided. The method comprises: determining at least one rotation factors associated with a plurality of orthogonal beams; selecting a subset of beams from the plurality of orthogonal beams; and sending, to the network node, the selected subset of beams and the at least one rotation factors, wherein the selected subset of beams and the at least one rotation factors are part of the parameters of the precoder. A wireless device for carrying out this method is also provided.

Abstract: The present invention relates to a network node and a method performed by the network node for controlling communication between a radio base station, RBS, and user equipments, UEs. The RBS has multiple antennas and uses beam forming when communicating with the UEs. The method comprises obtaining (702) information on an expected first propagation path direction interval between the RBS and UEs served by other neighboring RBSs, and obtaining (704) information on an expected second propagation path direction interval between the RBS and served UEs; defining (706) a first communication power limit for each of a plurality of beams according to the obtained information, the first limit being defined to suppress communication power in the first propagation path direction interval, when the plurality of beams are transmitted; and determining (708) antenna weights for each of the plurality of beams based on the defined first communication power limit.

Abstract: According to some embodiments, a method of adapting reference signals of a wireless network comprises establishing a first wireless connection with a first user equipment. The first wireless connection is associated with one or more references signals and each of the one or more reference signals is associated with one or more antenna ports. The method further comprises mapping one of the one or more reference signals associated with one or more antenna ports to at least two antenna port reference signal resources (APRSR) for the first user equipment, wherein the APRSR comprises a pair of consecutive time-frequency resource elements of a radio subframe of the first wireless connection.