Abstract: Embodiments herein relate to a method in a user equipment for performing channel estimation of one or more long term channel properties at the user equipment, wherein the user equipment is served by a radio network node.

Abstract: Methods and apparatus are disclosed for receiving user data in a wireless communication system that employs coordinated multi-point transmission of the user data from a first cell serving a wireless terminal and a second cell site neighboring the first cell site. In an exemplary system, the first cell site maps control signals and user data to a time-frequency resources according to a first mapping pattern, while the second cell site maps control data and traffic data to the time-frequency resources according to a second mapping pattern.

Abstract: A method performed by a base station of enabling a User Equipment, UE, to determine a precoder codebook in a wireless communication system is provided. The base station transmits (303) to the UE, information regarding precoder parameters enabling the UE to determine the precoder codebook. The precoder parameters are associated with a plurality of antenna ports of the base station. The precoder parameters relate to a first dimension and a second dimension of the precoder codebook. The plurality of antenna ports comprises a number NT of antenna ports that is a function of a number Nh of antenna ports in the first dimension, and a number Nv of antenna ports in the second dimension.

Abstract: A method (100) in a network node serving a User Equipment (UE) capable of network assisted interference cancellation is disclosed. The method involves a signaling (104) of an indication to the UE indicating whether the UE should enable or disable (108) the network assisted interference cancellation, or whether the UE should autonomously choose (110) to enable or disable the network assisted interference cancellation. The enabling or disabling is done for at least one of demodulating the downlink channel or computing the channel state information. The method further involves a receiving (106) of information from the UE about whether the network assisted interference cancellation has been used by the UE for at least one of demodulating the downlink channel and computing the channel state information. A related method in a UE is also disclosed, together with the network node and the UE as such.

Abstract: A network node, a UE and respective methods therein are provided for enabling transmission of data using a resource element reserved for CRS. The method in the network node for scheduling a downlink data transmission to the UE currently connected to the network node, comprises determining to schedule data transmission to the UE using at least one resource element reserved for transmitting CRSs during at least one subframe; and transmitting data to the UE using the at least one resource element reserved for transmitting the at least one CRS during the at least one subframe.

Abstract: Systems and methods for search area-based control channel monitoring are provided. According to one exemplary embodiment, a method is performed by a control node for communication with a user equipment. Further, the communication is structured in frames with each frame having subframes. The method includes transmitting, by the control node, a control channel in a search area that is in a subset of the subframes for a frame so as to enable the user equipment to monitor the control channel in only the subset of the subframes for that frame.

Abstract: A method may be provided to operate a first base station in a Radio Access Network including the first base station and a second base station. According to this method, a Reference Signal Received Power (RSRP) measurement list, a Coordinated Multipoint (CoMP) hypothesis, and a Benefit Metric may be communicated between the first and second base stations.

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 technology is disclosed for decoding a received signal at a wireless device. A first receiving process is performed comprising a decoding of the signal giving a first decoded result. It is determined if the first decoded result is correctly decoded. If so, the first decoded result is provided for downstream processing. If not, a second receiving process is performed comprising a decoding of the received signal for providing a second decoded result; and the second decoded result is provided for downstream processing. Further, either the first or second receiving process performs a blind detection of the transmission properties of an interfering signal and performs an interference cancellation thereupon.

Abstract: A receiving unit or a transmitting unit of a wireless network, and method therefor, for facilitating noise and interference measurements on an air interface. The receiving unit includes: a network interface which obtains information relating to a time-varying layout of a silent resource element (RE) grid; an electronic memory having code in communication with the network interface which stores the information; and a processing unit in communication with the electronic memory that takes a presence of a silent RE grid into account in the reception of a control or a data channel. Information relating to a time-varying layout of a silent resource element (RE) grid is obtained and a presence of a silent RE grid is taken into account in the reception of a control or a data channel.

Abstract: According to certain embodiments, methods and systems include providing interference characterization data by a network node to a first wireless device for use in performing interference mitigation. The network node may provide telecommunications services for a first wireless device associated with the network node. Characteristic data may be identifying by the network node. The characteristic data may be associated with at least one characteristic of an interfering signal associated with a second wireless device. The characteristic data may be transmitted to the first wireless device and may identify a precoder granularity configured for least one physical resource block pair associated with the interfering signal.

Abstract: The present invention relates to methods and arrangements for neighbour cell quality measurements using silent resource element (RE) grids, and as well to a silent RE grid.

Abstract: A communications system comprises a second device (28) and a first device (30). The first device (30) is of a type which receives, on a downlink over a radio interface from a second device, precoded information (29). In an example mode the first device 28 generates a multi-part feedback signal (22) which is configured to affect content of a precoder matrix (40) utilized by the second device (28). On an uplink over the radio interface to the second device, at least two different parts of the multi-part feedback signal are transmitted with two respective different transmission granularities in time and/or frequency.

Abstract: Techniques and apparatus for selectively switching among two or more possible reference signal densities are disclosed. An example method comprises obtaining (110) one or more reference signal conditions that governs the density of the reference signal format to be transmitted by a wireless communication device in conjunction with data transmissions, where the one or more reference signal conditions are defined in advance of any scheduling of those data transmissions. The example method further comprises evaluating (120) the one or more reference signal conditions and selecting (130) a density of a reference signal format, from two or more possible densities, based on the outcome of the evaluation. In embodiments where the node that carries out the evaluation is the transmitting node, the method further comprises transmitting (140) one or more reference signals in conjunction with one or more data transmissions, in accordance with the selected reference signal density.

Abstract: A method for wirelessly transmitting data and control information using a plurality of transmission layers includes determining a number of bits in user data codewords to be transmitted during a subframe and calculating a number of control vector symbols to allocate to control information during the subframe. The number of control vector symbols is calculated based on the number of bits in the user data codewords to be transmitted during the subframe and an estimate of the number of vector symbols onto which the user data codewords will be mapped. The estimate of the number of vector symbols depends on the number of control vector symbols to be allocated to control information. The control codewords may be mapped to the calculated number of control vector symbols and transmitting vector symbols carrying the user data codewords and the control codewords over the plurality of transmission layers during the subframe.

Abstract: According to an embodiment of the invention, a method of operating a control node for communication with at least one receiving node is provided. The communication is structured in frames comprising several subframes (1) which may be divided into subbands in the frequency domain. The method comprises transmitting a control channel in a search area (8) of one of the subframes (1). The search area (8) comprises a configurable time span and may span one or more of the subbands.

Abstract: A method may be provided to operate a first base station in a Radio Access Network including the first base station and a second base station. According to this method, a Reference Signal Received Power (RSRP) measurement list, a Coordinated Multipoint (CoMP) hypothesis, and a Benefit Metric may be communicated between the first and second base stations.

Abstract: Methods for wirelessly transmitting user data and control information using a plurality of transmission layers include encoding bits of control information to form control codewords and encoding bits of user data to form user data codewords. The method also includes generating a plurality of vector symbols based on the control codewords and the user data codewords. Each vector symbol includes a plurality of modulation symbols that are each associated with a transmission layer over which the associated modulation symbol will be transmitted. Generating the plurality of vector symbols includes interleaving bits of the control codewords and bits of the user data codewords so that the control information is carried in modulation symbols associated with the same transmission layers in the vector symbols transmitted during the subframe that carry the control information. The method also includes transmitting the plurality of vector symbols to a receiver over a plurality of transmission layers.

Abstract: The present invention relates to methods and arrangements for neighbor cell quality measurements using silent resource element (RE) grids, and as well to a silent RE grid.

Abstract: A base station in a communications network broadcasts a cell-specific instruction to a plurality of mobile terminals in a cell served by the base station. The cell-specific instruction indicates that an uplink symbol has been semi-statically configured for aperiodic sounding reference signal (SRS) transmission over multiple subsequent subframes. The base station dynamically determines that a first mobile terminal of the plurality of mobile terminals is to use the uplink symbol for SRS transmission in a given one of the multiple subsequent subframes. In response, the base station signals a first terminal-specific instruction to the first mobile terminal. The first terminal-specific instruction is distinct from the cell-specific instruction and indicates that the first mobile terminal is to use the uplink symbol for SRS transmission in the given subframe.