Abstract: A user equipment (UE) provides feedback about channel conditions. From a set of primary sub-bands subject to channel state information reporting by the UE, there is identified one or more of the primary sub-bands for reporting channel quality with a finer frequency-domain granularity than other primary sub-bands of the set (202). The one or more is less than all primary sub-bands in the set. In various embodiments, either the UE or the network can select which are the primary sub-bands to be identified for the finer granularity reporting, and the selection can be for example the best primary sub-bands or those with the highest variance in a measure of channel quality or random (206). Then for each of the identified primary sub-bands, the UE measures and reports the channel quality with the finer frequency-domain granularity for each secondary sub-band whose frequency lay within the respective identified primary sub-band.

Abstract: Various communication network may benefit from precoding matrix smoothing. For example, a network node comprises a processor and a memory including computer program code. The memory and the computer program code, with the processor, are configured to cause the network node to receive a precoding matrix index indicating a precoding matrix, allocate resources for downlink transmission to a user equipment, smooth a plurality of precoding matrices including the precoding matrix across the allocated resources and transmit a signal indicating the plurality of precoding matrices have been smoothed. Based on the signal, the user equipment can perform interference reduction or cancellation.

Abstract: An arrangement is described for adapting outer loop precoder phase combiner in a radio communication system having coordinated multipoint transmission. In the arrangement ACK/NACK-message received as a response to a transmitted data packet is used for adapting the phase. When a NACK-message is received the phase may be adapted or it may be further determined if the error was due to error in channel code or due to destructive inter-point signal combining. If the error was due to destructive combining the phase is adjusted.

Abstract: Various communication network may benefit from precoding matrix smoothing. For example, a network node comprises a processor and a memory including computer program code. The memory and the computer program code, with the processor, are configured to cause the network node to receive a precoding matrix index indicating a precoding matrix, allocate resources for downlink transmission to a user equipment, smooth a plurality of precoding matrices including the precoding matrix across the allocated resources and transmit a signal indicating the plurality of precoding matrices have been smoothed. Based on the signal, the user equipment can perform interference reduction or cancellation.

Abstract: A method, apparatus and computer program product are provided to suppress interference, such as interference attributable to increased network density, interference attributable to interference between uplink and downlink transmissions in a TDD system and/or interference attributable to D2D communications. In the context of a method, it is determined whether communication between an access point and a mobile terminal or between a mobile terminal and another mobile terminal is to be subjected to real-valued modulation or complex-valued modulation such that the modulation and a dominant form of interference for the mobile terminal are either both real-valued or both complex-valued. The method also includes providing for communication with the mobile terminal in accordance with the one of real-valued modulation or complex-valued modulation that was determined.

Abstract: A user equipment (UE) provides feedback about channel conditions. From a set of primary sub-bands subject to channel state information reporting by the UE, there is identified one or more of the primary sub-bands for reporting channel quality with a finer frequency-domain granularity than other primary sub-bands of the set (202). The one or more is less than all primary sub-bands in the set. In various embodiments, either the UE or the network can select which are the primary sub-bands to be identified for the finer granularity reporting, and the selection can be for example the best primary sub-bands or those with the highest variance in a measure of channel quality or random (206). Then for each of the identified primary sub-bands, the UE measures and reports the channel quality with the finer frequency-domain granularity for each secondary sub-band whose frequency lay within the respective identified primary sub-band.

Abstract: Measures including a method, comprising deriving at least one of one or more statistics of an interfering channel and a rate matching parameter of the interfering channel based on an interfering colocation information received from a serving transmission point device, wherein the interfering channel comprises a channel between an apparatus performing the method and an interfering transmission point device different from the serving transmission point device.

Abstract: A method and apparatus for distributed coordinated scheduling (virtual joint scheduling) is provided. A primary entity is selected and it performs joint scheduling decisions according to information received from one or more coordinating secondary entities. Information received from user equipments served by the primary entity may be taken into account. The primary entity then forwards information of its joint scheduling decisions or some outcome quantity to the one or more secondary entities, each of which may perform their own localized scheduling decisions based on the information provided by the primary entity.

Abstract: A method can include providing channel feedback to support efficient rank override For example, in such a method, a rank?r precoder index corresponding to a rank?r precoder is determined, and performance for each rank?1 precoder within the rank?r precoder is measured Based on the measured performance, a rank?1 precoder that maximizes performance is selected.

Abstract: Methods, apparatus and computer readable storage media are provided herein for scrambling code signalling in support of interference cancelling receivers. In some example embodiments, a method is provided that includes receiving scrambling code initialization parameters for at least one wanted codeword and for at least one interfering codeword from a base station. The method of this embodiment may also include detecting the at least one wanted codeword and the at least one interfering codeword in a transmission that is received from a base station. The method of this embodiment may also include decoding the at least one wanted codeword and the at least one interfering codeword. In some example embodiments, the decoded at least one interfering codeword is used in at least one of interference detection or interference cancellation.

Abstract: A network node includes, into a field of downlink control information that provides a user equipment with information for reception and decoding of data transmitted from the network node to the user equipment in a mobile communication network, an indication of receiver information. The receiver information is applicable for interference suppression/cancellation by a receiving operation of the user equipment, capable of performing interference suppression/cancellation using the receiver information. The user equipment detects the receiver information from the downlink control information, and can select a receiving operation using the receiver information.

Abstract: An arrangement is described for adapting outer loop precoder phase combiner in a radio communication system having coordinated multipoint transmission. In the arrangement ACK/NACK-message received as a response to a transmitted data packet is used for adapting the phase. When a NACK-message is received the phase may be adapted or it may be further determined if the error was due to error in channel code or due to destructive inter-point signal combining. If the error was due to destructive combining the phase is adjusted.

Abstract: A method can include providing channel feedback to support efficient rank override For example, in such a method, a rank?r precoder index corresponding to a rank?r precoder is determined, and performance for each rank?1 precoder within the rank?r precoder is measured Based on the measured performance, a rank?1 precoder that maximizes performance is selected

Abstract: In an embodiment, state of a wireless channel on which information is received is measured; the measured state is used to select from a codebook a plurality of N codewords which optimize a predefined measure, and first and second codewords of the plurality are reported which best optimizes and next-best optimizes the predefined measure. If by example the above is done by a user equipment UE, in another embodiment the network receives first and second indications, searches a codebook using the first and second indications to find the first and second codewords; and utilizes them to improve the channel state information, such as by interpolating between them to find an estimate of the channel. In examples the channel is a MIMO channel that is estimated at two or more antenna ports, there are interpolation weights sent with the codeword indications, and the interpolating uses a geodesic algorithm.

Abstract: In accordance with an example embodiment of the present invention, an apparatus, comprising a processor configured to derive a time period; and a transmitter configured to transmit a first signal and a second signal to a network element, wherein the second signal is coupled to the first signal in a predetermined way within the time period, is disclosed.

Abstract: An approach is provided for transmitting channel feedback information. Bandwidth is partitioned into one or more resource groups corresponding to one or more resource units. One or more of the partitions is designated for transmission of a plurality of uplink pilots that specify channel information for the corresponding resource units.