The present disclosure is directed to a modular and scalable front-end architecture for a massive MIMO communication device, such as a base station. The front-end architecture can allow for the number of antennas at the communication device to be increased or decreased in a simple and cost efficient manner. The front-end architecture can also allow for the number of data streams that can be transmitted and/or received by the communication device to be increased or decreased in a simple and cost efficient manner.

Methods and apparatuses are provided for wireless communication. Control symbols are mapped to a plurality of resource element groups (REGs) which is not assigned to a physical channel format indication channel (PCFICH) or a physical hybrid automatic repeat request indicator channel (PHICH). The REGs are allocated based on a time first manner. The mapped control symbols are transmitted on a packet dedicated control channel (PDCCH).

A technique for receiving and transmitting downlink reference signals is disclosed. When transmitting downlink data demodulation reference signals (DMRS) (or reference signals for downlink data demodulation) by using two or more layers, the DMRS of each layer may be multiplexed by using a code division multiplexing method and then transmitted. The DMRS for each of the two or more layers may be used for one user equipment or for two or more user equipments. And, downlink control signals for transmitting and receiving such DMRS may be configured to have the same format regardless of a single-user mode (or SU-MIMO mode) or a multi-user mode (or MU-MIMO mode), thereby being used.

According to one embodiment of the present invention, a method by which a fixed base station adjusts inter-cell interference in a wireless communication system comprises the steps of: receiving channel state information-reference signal (CSI-RS) configurations on an access link of each moving cell connected to the fixed base station; determining the CSI-RS configuration on a backhaul link of a first moving cell among the moving cells on the basis of the CSI-RS configurations on the access link; and providing, to the first moving cell, the CSI-RS configuration on the determined backhaul link, wherein the CSI-RS configuration on the determined backhaul link is for measuring, by the backhaul link of the first moving cell, the interference received from an access link of a second moving cell among the moving cells.

According to an example aspect of the present invention, there is provided an apparatus for a base station including at least one processing core, configured to cause the apparatus at least to define a first cluster of time-division duplex user equipments at least partly by including in the first cluster user equipments whose uplink signals may be received using a single first directional beamforming beam, determine a ratio of received signal strengths of a pair of user equipments in the first cluster, the pair including a first user equipment associated with the apparatus and a second user equipment associated with a neighbouring base station device, and responsive to the ratio fulfilling a predetermined condition, inform the neighbouring base station device of a scheduling plan of the first user equipment.

Interference between reference signals from user equipments in a wireless network, the method may be reduced by using a received time shift value from a node in the wireless network. An interference randomization technique may be applied to a reference signal and a sequence may be generated based on the reference signal to which the interference randomization technique has been applied. A processed reference signal may be derived by applying a time shift based on the time shift value to the sequence. The processed reference signal may be transmitted to the node. Related systems, methods, nodes and wireless devices are also described.

A method and apparatus for signaling usable downlink (DL) subframes for a low cost user equipment (UE) in a wireless communication system is provided. The low cost UE receives information on usable DL subframes for the low cost UE from a network, and performs reception by using the usable DL subframe from the network.

A radio repeater system is described that disables itself to avoid interfering with mobile network performed multilateration of mobile devices. The radio repeater provides additional network coverage for a localized area. The localized area can include enclosed spaces such as buildings or transportation terminals. The radio repeater system can monitor the signals received from cell towers, and if there are at least three signals of a predetermined signal strength, the radio repeater can disable itself to avoid interfering with mobile locating performed by the network. The radio repeater can remain disabled until the conditions that led to the disabling have passed.

A method, network node and user equipment are provided. In one or more embodiments, a first user equipment, UE, configured to communicate with a second UE for performing non-orthogonal multiple access, NOMA, communication is provided. The first UE includes processing circuitry configured to receive a first signal including a first component of interleaved-rotated symbols associated with the second UE, determine a second component of the interleaved-rotated symbols based at least in part on the received first component, and cause transmission of a second signal including the second component of the interleaved-rotated symbols to the second UE as part of the NOMA communication where the second signal not including the first component of the interleaved-rotated symbols.

The present invention relates to a method for assigning transmission resources (101) to communications between an access node (11) and a plurality of subscriber devices (41 to 46) coupled to a shared transmission medium.

In accordance with an embodiment of the invention, the method comprises characterizing interference between respective ones of the plurality of subscriber devices over the shared transmission medium, grouping highly-interfering subscriber devices into respective interfering groups (G1, G2, G3, G4) based on the so-characterized interference, and assigning disjoint transmission time intervals to upstream communication from any one subscriber device of any one interfering group and to downstream communication towards any other subscriber device of the same interfering group.

The present invention also relates to a resource controller.