Abstract: A double structured codebook is described that has a wideband codebook portion C(W1) and a frequency-selective codebook portion C(W2). Portion C(W2) is characterised in that for at least one rank index RI, each codeword of C(W2) is uniquely distinguished over all other codewords of C(W2) by at least two beam selection vectors per layer. A device (UE, eNB, etc) utilises the at least two different beam selection 10 vectors per layer to uniquely select a codeword W2 from C(W2) (404); and constructs a pre-coder W from the selected codeword W2 and from another codeword W1 selected from the wideband codebook portion C(W1) for signalling channel conditions (406). An additional co-phasing term for ensuring orthogonality can be utilised with the beam selection vectors per layer to uniquely select the codeword from C(W2), and the two different beam selection vectors per layer correspond to different polarizations (410).

Abstract: Systems, methods, apparatuses, and computer program products for enhanced link adaptation are provided. One method includes receiving, by a network node, channel state information (CSI) feedback from at least one user equipment (UE), scheduling the same UEs in one rank or more than one rank in the same subframe, and scheduling multiple UEs on at least one same time-frequency resource.

Abstract: Embodiments provide a feedback indicator for coordinated multi-point operations of various coordinated multi-point schemes and/or scenarios. An exemplary embodiment involves generating a feedback indicator for coordinated multi-point operations, the feedback indicator indicating a recommendation for a CoMP controller entity to request signaling of multi-point feedback information with respect to multiple coordinated multi-point transmission points, and signaling the generated feedback indicator for coordinated multi-point operations to the CoMP controller entity.

Abstract: Systems, methods, apparatuses, and computer program products for joint network assisted interference cancellation and suppression (NAICS) and coordinated multi-point (COMP) operation are provided. One method includes configuring, by a network node, a victim user equipment and interfering user equipment in transmission mode 10 (TM10) with multiple channel state information (CSI) processes to perform dynamic point muting. The method may further include signaling network assisted interference cancellation and suppression (NAICS) information to the victim user equipment pretending the interfering user equipment mode is transmission mode 9 (TM9) or transmission mode 8 (TM8).

Abstract: To control UE assumption of interference there is a controller module to control a plurality of transmission points, each constituted by a set of at least one transmit antenna, to transmit data to another device in a coordinated transmission from at least a subset of the plurality of transmission points. The controller module is configured to allocate, to each resource linked to the subset of the plurality of transmission points, an interference contribution parameter that is indicative of an expected interference contribution originating from said transmission point, and to inform said another device of those resources to which the subset of the plurality of transmission points is linked, together with the respective interference contribution parameter allocated to each resource. Another device reports feedback based on signals which are scaled with the respective interference contribution parameter.

Abstract: Systems and techniques for interference management. A set of CSI-RS subframe configurations is established, and a mapping specified associating each CSI-RS subframe configuration with a corresponding CSI-RS configuration subset indicator, such that the CSI-RS configuration subset indicator identifies allowed CSI-RS subframe configurations at a first base station. The specified mapping is stored at the base station, and the configuration subset indicator is signaled to neighboring base stations. In response to receiving one or more CSI-RS configuration subset indicators at a user device from a serving base station, a determination is made for each of plurality of subframes whether one or more CSI-RS subframe configurations represented by the one or more CSI-RS configuration subset indicators indicates a CSI-RS presence in the subframe. If the one or more subframe configurations indicates a CSI-RS presence, at least partially clean resource element (RE) cancellation interference is applied in the subframe.

Abstract: The present invention proposes methods and devices related to improvements in coordinated multipoint transmission arrangements, and in this regard proposes a device, including a controller module, configured to control a plurality of transmission points, each constituted by a set of at least one transmit antenna, to transmit data to another device in a coordinated transmission from at least a subset of the plurality of transmission points, wherein each subset with resources allocated thereto defines a respective coordinated transmission scheme, wherein the controller module is configured to transmit information on resources pertaining to multiple coordinated transmission schemes, and send at least one biasing parameter associated to at least one of the transmission schemes, to be applied for biasing a channel quality parameter.

Abstract: A double structured codebook is described that has a wideband codebook portion C(W1) and a frequency-selective codebook portion C(W2). Portion C(W2) is characterised in that for at least one rank index RI, each codeword of C(W2) is uniquely distinguished over all other codewords of C(W2) by at least two beam selection vectors per layer. A device (UE, eNB, etc) utilises the at least two different beam selection 10 vectors per layer to uniquely select a codeword W2 from C(W2) (404); and constructs a pre-coder W from the selected codeword W2 and from another codeword W1 selected from the wideband codebook portion C(W1) for signalling channel conditions (406). An additional co-phasing term for ensuring orthogonality can be utilised with the beam selection vectors per layer to uniquely select the codeword from C(W2), and the two different beam selection vectors per layer correspond to different polarizations (410).

Abstract: Methods, apparatus and computer program products define additional resource elements of a physical resource block (PRB) to be allocated for the provision of channel state information reference signals in a manner that does not create issues relating to backwards compatibility for legacy mobile terminals. A method may include receiving a definition of a plurality of resource elements of a PRB to be allocated for provision of channel state information reference signals. At least some of the plurality of resource elements of the PRB that are allocated for the provision of channel state information reference signals correspond in position to resource elements of the PRB that are interpreted by a different type of mobile terminal to be muted. The method also causes channel state information reference signals to be received via the plurality of resource elements of the PRB that are allocated for the provision of channel state information reference signals.

Abstract: Methods, apparatus and computer program products define additional resource elements of a physical resource block (PRB) to be allocated for the provision of channel state information reference signals in a manner that does not create issues relating to backwards compatibility for legacy mobile terminals. A method may include receiving a definition of a plurality of resource elements of a PRB to be allocated for provision of channel state information reference signals. At least some of the plurality of resource elements of the PRB that are allocated for the provision of channel state information reference signals correspond in position to resource elements of the PRB that are interpreted by a different type of mobile terminal to be muted. The method also causes channel state information reference signals to be received via the plurality of resource elements of the PRB that are allocated for the provision of channel state information reference signals.

Abstract: To control UE assumption of interference there is a controller module to control a plurality of transmission points, each constituted by a set of at least one transmit antenna, to transmit data to another device in a coordinated transmission from at least a subset of the plurality of transmission points. The controller module is configured to allocate, to each resource linked to the subset of the plurality of transmission points, an interference contribution parameter that is indicative of an expected interference contribution originating from said transmission point, and to inform said another device of those resources to which the subset of the plurality of transmission points is linked, together with the respective interference contribution parameter allocated to each resource. Another device reports feedback based on signals which are scaled with the respective interference contribution parameter.

Abstract: For coordinated multipoint transmission arrangements there is provided a device, including a controller module, configured to control a plurality of transmission points, each constituted by a set of at least one transmit antenna, to transmit data to another device in a coordinated transmission from at least a subset of the plurality of transmission points, wherein each subset with resources allocated thereto defines a respective coordinated transmission scheme, wherein the controller module is configured to transmit information on resources pertaining to multiple coordinated transmission schemes, and send at least one biasing parameter associated to at least one of the transmission schemes, to be applied for biasing a channel quality parameter. Another device includes a controller module, configured to report feedback responsive to such coordinated transmission, and the controller module is, among others, configured to apply the at least one biasing parameter to derived channel quality parameters.

Abstract: A method and apparatus are provided for an apparatus. The apparatus includes at least one memory including computer program code, and at least one processor. The at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus at least to receive an indication of a set of codeword groups to be included in a codebook, and to select a precoding matrix index based on the indicated set of codeword groups in the codebook. The apparatus is also cause to transmit the precoding matrix index to a network node.

Abstract: Methods for devices, devices and computer program products for devices relate to a communication module, arranged for packet based communication, and including a receiving module. The receiving module is arranged to receive a control message, wherein the control message includes a plurality of acknowledgement information items, wherein each of the plurality of acknowledgement information items are located in a preset portion of the control message, respectively. The device further includes a determination module, arranged to determine whether the received control message is intended for the device, a selection module, arranged to select, responsive to an affirmative determination result, at least one of the plurality of acknowledgement information items based on the preset portions, and an obtaining module, arranged to obtain control data contained in the selected at least one of the plurality of acknowledgement information items.

Abstract: An apparatus and method for communication are provided. The solution includes controlling the estimation of a radio channel to obtain an estimate of a channel quality, performing quantization of the estimate of the channel quality to obtain a channel quality index, the quantization steps being of non-uniform size and selected on the basis of the accuracy of the estimation on different levels of channel quality, and controlling the transmission of the channel quality index to the communication system.

Abstract: A method is provided that includes allocating a first subset of resource elements (REs) of a physical resource block (PRB) to a mobile terminal and associating one or more first demodulation reference symbols (DM-RS) ports therewith. The first subset of REs and the one or more first DM-RS ports have common interference characteristics, thereby providing for enhanced interference suppression. The method also includes causing transmission of the PRB for reception by the mobile terminal. Corresponding apparatus and computer program products are also provided.

Abstract: A multi-structured codebook includes a wideband codebook portion C(W1) and a frequency-selective codebook portion C(W2). The wideband portion C(W1) is characterized by a shifted set of indices for at least rank 1 such that the set of indices centers different groups of neighboring beams around a center beam in front of an antenna array. In one example, for rank 1 the indices run 24, 25, . . . 31, 0, 1, . . . 7. The frequency-selective portion C(W2) is characterized by having a non-equal number of entries for beams in a corresponding W1 codeword from the wideband codebook portion C(W1). In the examples some W1 codewords have corresponding W2 codewords with multiple same-beams and one or more different beams per polarization. A codeword W2 is selected from the frequency-selective codebook portion C(W2) and another codeword W1 is selected from the wideband codebook portion C(W1) for signaling channel conditions.

Abstract: An apparatus and method for selecting a beam group and a subset of beams in a communication system are disclosed. The method includes: measuring channel state information (CSI) on a downlink from a base station (920); identifying a selected beam group out of a set of beam groups according to a wideband property of the CSI (930); identifying a selected subset of beams in the selected beam group according to at least one subband (940). Wherein the characteristic of the set of beam groups depends on a transmission rank and the number of beams in the selected subset of beams is equal to the transmission rank. The method further includes: generating encoded feedback information identifying the selected beam group and the selected subset of beams for each subband in a double codebook format (950), transmitting the encoded feedback information to the base station.

Abstract: A network sends to a user equipment UE a reference signal configuration, and from receiving it the UE selects a codeword identifying a cooperative multipoint CoMP transmission scheme. There is a CoMP scheme selection codebook from which the UE selects the codeword corresponding to its recommended CoMP scheme. The UE sends to the network that codeword which identifies the CoMP transmission scheme, along with the CSI feedback characterizing the CoMP transmission scheme. From that codeword which the network receives it determines the UE's assumed CoMP transmission scheme, which the network uses to determine how the CSI feedback, received from the UE, was calculated by the UE (for example, joint transmission, or dynamic point selection with or without muting, or coordinating scheduling/beamforming). The network uses this information for selecting a CoMP transmission scheme for downlink CoMP transmissions to the UE.

Abstract: A first precoding matrix W1 is selected from a first codebook comprising sets of rank specific precoding matrices. The first codebook is characterized by there being fewer precoding matrices associated with higher ranks than associated with lower ranks, and characterized by precoding matrices associated with ranks above a certain rank all being diagonal matrices. The selected first precoding matrix W1 is used to select a rank-specific second precoding matrix W2 from a second codebook, such that the selected first and second precoding matrices form a joint precoder specific to a desired rank. The second codebook is characterized by differently sized precoding matrices associated with each of N total ranks, in which N is an integer greater than one. Information on the joint precoder is reported to a network node over an uplink transmission channel.