Abstract: Systems and methods are disclosed for utilizing unused bit resources to convey restrictions on parameters evaluated for a feedback report in a Multiple-Input Multiple-Output (MIMO) wireless communication system. In one embodiment, a method of operation of a transmitting node in a wireless network includes transmitting a feedback restriction indicator to a receiving node, where the feedback restriction indicator is an unused bit resource in one or more instances of a control channel that is indicative of one or more desired restrictions on parameters to be evaluated by the receiving node for a feedback report to be provided from the receiving node. The method of operation of the transmitting node further includes receiving the feedback report from the receiving node, where the feedback report is limited according to the feedback restriction indicator.

Abstract: A method by a network node in a communications system includes determining a codebook subset restriction indicating a reduced set of precoding matrices out of an original set of precoding matrices in an original codebook. The full set of Precoding Matrix Indicator, PMI, bits is used to identify the original set of precoding matrices in the original codebook. The method includes determining a reduced set of Precoding Matrix Indicator, PMI, bits for use in a feedback channel based on a number of entries in the reduced set of precoding matrices. The reduced set of PMI bits has fewer bits than the full set of PMI bits. Related user equipments, methods by user equipments and network nodes are disclosed.

Abstract: The present invention relates to a method and arrangements in a communication system for Multi User Multiple-Input-Multiple-Output (MU-MIMO) signaling via Multiple-Input-Multiple-Output (MIMO) antennas between a base station and one of a plurality of mobile terminals supporting both Single User and Multi User Multiple-Input-Multiple-Output (SU-MIMO and MU-MIMO) signaling modes. Switching between the modes is supported in the system and the modes have partly shared signaling. SU-MIMO mode signaling which is redundant, i.e. not needed, for MU-MIMO mode signaling is identified. Bits, i.e. data bits, of the identified redundant signaling is re-interpreted or re-defined to comprise signaling information associated with MU-MIMO mode. The signaling information associated with MU-MIMO mode is signaled to the mobile terminal by using the reinterpreted redundant bits.

Abstract: A method performed by a central network node includes instructing one of a first network node and a second network node to transmit to a first wireless device. The central network node receives a first Channel Quality Indicator, CQI, and a third CQI sent by the first wireless device. The first CQI has been computed by the first wireless device based on a first unique signal transmitted by the first network node. The third CQI has been computed by the first wireless device based on a second unique signal transmitted by the second network node. The central network node identifies the one of the first and the second network nodes having a better channel quality, based on the received first CQI and the third CQI. The central network node sends a first message to the identified network node, instructing it to transmit to the first wireless device.

Abstract: A method and apparatus for signaling scheduling information in a spatial multiplexing wireless communications system, as well as corresponding methods and apparatus for processing such signaling information, are disclosed. Signaling scheduling information includes scheduling first and second transport blocks for simultaneous transmission during a first transmission interval on first and second data substreams, respectively, and assigning a single re-transmission process identifier for the first transmission interval and transmitting first scheduling information for the first transmission interval. The first scheduling information includes the re-transmission process identifier and first disambiguation data. Additionally, at least one of the first and second transport blocks is scheduled for re-transmission during a second transmission interval.

Abstract: The invention relates to an integrated antenna node for use in wireless communication in a communication system, the wireless communication involving uplink and downlink physical-layer processing. The integrated antenna node is adapted to perform, for at least one set of corresponding uplink and downlink physical-layer processing functions, only the uplink physical-layer processing functions or the corresponding downlink physical-layer processing functions. The invention further relates to a main node, a radio base station, computer programs and computer program products.

Abstract: The invention relates to devices and methods for signalling control information associated with transmission of data over a wireless channel. A second communication device receives (S2) data from a first communication device, wherein the data comprises an indication of recommended precoders and a recommendation of a first transmission rank to possibly use during transmission. The second communication device determines (S4) a second transmission rank to use for transmitting data, and transmits (S6) a confirmation message to the first communication device. The confirmation message comprises a confirmation that transmission of data from the second communication device is using at least parts of each recommended precoder associated with a frequency resource that falls within the transmission of data and an indicator of the second transmission rank to use.

Abstract: Systems and methods are disclosed for providing location-based codebook subset restriction. In some embodiments, location-based codebook subset restriction is provided in such a manner as to mitigate co-channel interference from a macro base station to User Equipment devices (UEs) in a cell range expansion zone of a Low Power Node (LPN) within a coverage area of the macro base station. In this manner, performance of the UEs in the cell range expansion zone is improved.

Abstract: A method comprises determining a first and a second sub-carrier associated with a channel, and multiplying a signal received on the first sub-carrier with a first number to form a first resulting signal. The first number multiplied with a known signal transmitted by a second transmitting node on the first sub-carrier equals a constant value. A signal received on the second sub-carrier is multiplied with a second number to form a second resulting signal. The second number multiplied with the known signal transmitted by the second transmitting node on the second sub-carrier equals the constant value. The second resulting signal is subtracted from the first resulting signal to obtain a signal for which interference from the second transmitting node is suppressed, and the channel is estimated based on the obtained signal.

Abstract: In MU-MIMO scenarios, a transmitting node (700) receives feedback on a feedback channel from a receiving node (1200) regarding a channel between the transmitting and receiving nodes (700, 1200). The feedback also includes preferences of the receiving node (1200). However, the feedback may not always be useful. For example, the receiving node (1200) may indicate a preferred rank in the feedback that the transmitting node (700) cannot accommodate. To address such issues, mechanisms for the transmitting node (700) to convey its preferences to the receiving node (1200) are proposed. The receiving node (1200), with such knowledge, can provide more useful feedback information to the transmitting node (700).

Abstract: A method for assisting the adaptation of a signal from a first node to a second node is provided. The first node communicates with the second node in a wireless communication system over a radio link. The second node has a codebook comprising a set of possible information alternatives for assisting the adaptation of a signal received from the first node. The second node may select an information alternative from the codebook and send it to the first node to assist the first node in adapting the signal. The first node is configured with a number of subsets, each comprising a part of the possible information alternatives. The first node requests that the second node restrict the selection of information alternatives to one of the subsets, and in response, receives an information alternative from the second node that is selected from among the subsets configured according to the configuration request.

Abstract: A method for wirelessly transmitting data using a plurality of transmission layers includes estimating a number of data vector symbols to be allocated to one or more user data codewords during the subframe and determining a number of bits in the one or more user data codewords. The method also includes calculating a nominal number of control vector symbols to allocate to control information based, at least in part, on the estimated number of data vector symbols and the determined number of bits in the one or more user data codewords. Additionally, the method includes determining an offset value based, at least in part, on a number of layers over which the wireless terminal will be transmitting during the subframe and calculating a final number of control vector symbols by multiplying the nominal number of control vector symbols and the offset value.

Abstract: A radio base station transmits data symbols to a mobile terminal on multiple frequency carriers, e.g., in accordance with the MC-WCDMA or cdma2000 3× air interface protocols. The radio base station instructs the mobile terminal to report channel quality measurements obtained by the terminal for the multiple carriers over the same uplink channel during successive reporting intervals. According to one embodiment, the mobile terminal reports channel quality by receiving data symbols transmitted on a plurality of frequency carriers in a multi-carrier CDMA environment and measuring channel quality for the different frequency carriers. The mobile terminal reports individual ones of the channel quality measurements over the same uplink channel during successive reporting intervals.

Abstract: In a multi-standard base station site, a first base station module is configured to operate in multi-antenna transmission mode according to a first radio access technology by means of multiple transmitter branches. The first base station module is also configured to determine phase/time compensation information based on UE feedback information representative of precoding matrix index, PMI. The multi-standard base station site is configured to perform, for operation according to the first radio access technology, a first compensation for a relative phase/time error between at least two of the transmitter branches based on the phase/time compensation information. A second base station module is configured to operate for transmission according to a second radio access technology by means of at least two of the multiple transmitter branches.

Abstract: A UE, for an HSPA WCDMA system, equipped with a first and a second transmit antenna, and arranged to use one or more sets of pre-coding weights for transmission. The UE is arranged to receive instructions from a NodeB on the set or sets of pre-coding weights to be used, and to transmit a first and a second pilot signal, and to use a first set of pre-coding weights for the first pilot signal and a second set of pre-coding weights for the second pilot signal, where the first set of pre-coding weights is the same as the UE uses for transmitting a first data stream, and to use different spreading codes for the first data stream and for the first pilot signal.

Abstract: Network node and method therein for inter cell interference coordination. A method in a network node comprises estimating spatial properties of a radio channel between a base station and at least part of an underlay/neighboring cell based on information about spatial properties of a radio channel between the base station and a respective at least one user equipment (UE) located in a region associated with inter cell interference in relation to the underlay/neighboring cell. A transmission is adapted to a UE, served by the base station in a reduced power subframe, based on a correlation between the spatial properties of the radio channel and estimated spatial properties of a radio channel between the base station and the UE. The method enables control of interference subjected towards the underlay/neighboring cell, caused by downlink transmission to the UE.

Abstract: A method for assisting the adaptation of a signal from a first node to a second node is provided. The first node communicates with the second node in a wireless communication system over a radio link. The second node has a codebook comprising a set of possible information alternatives for assisting the adaptation of a signal received from the first node. The second node may select an information alternative from the codebook and send it to the first node to assist the first node in adapting the signal. The first node is configured with a number of subsets, each comprising a part of the possible information alternatives. The first node requests that the second node restrict the selection of information alternatives to one of the subsets, and in response, receives an information alternative from the second node that is selected from among the subsets configured according to the configuration request.

Abstract: A radio network node identifies a codebook subset restriction to be applied to a user equipment (UE) employing carrier aggregation and multiple-input-multiple-output (MIMO), identifies a correspondence between the codebook subset restriction and multiple carriers in a carrier group of the UE, and transmits correspondence information indicating the correspondence between the codebook subset restriction and the multiple carriers in the carrier group. The UE receives the correspondence information and transmits channel state information for the multiple carriers according to the codebook subset restriction.

Abstract: Handover is a main function that is used to support mobility in the network. In a cellular communication network having adaptive antennas for enabling narrow beam operation, a network control unit sends a radio link setup request to a selected cell-serving network unit for configuration of a new serving radio link. Before responding to the radio link setup request the cell-serving network unit performs uplink measurements with respect to the mobile unit, and a narrow target beam is selected within a cell served by the cell-serving network unit based on these measurements. The cell-serving network unit then configures the new serving radio link for the considered mobile unit directly with the selected narrow target beam. Consequently the system can perform the handover procedure using narrow beams only, without first establishing the radio link with a cell-wide beam and then reconfiguring the radio link onto a narrow beam.

Abstract: A method and a radio network node for assisting in a handover of a user equipment from a first cell to a second cell as well as a method and a user equipment for handling the handover are disclosed. The radio network node sends an indication to the user equipment, wherein the indication indicates whether or not to use a same first codebook subset restriction bitmap in the second cell as in the first cell. Moreover, the user equipment receives the indication from the radio network node.