Abstract: A method and a terminal device are disclosed for measurement control. According to an embodiment, the terminal device detects, for a cell that is shared by two operators and to be measured by the terminal device, whether frequency bands used by the two operators for the cell are overlapped. When detecting that frequency bands used by the two operators for the cell are overlapped, the terminal device performs measurement on a reference signal from one of the two operators at least at the overlapped portion of the frequency bands. The terminal device reports information about a result of the measurement to the two operators.

Abstract: The present disclosure provides a method (200) in a network device for data transmission over a front haul interface between a first unit and a second unit. The method (200) includes: compressing (210), at the first unit, time domain data in frequency domain and/or spatial domain; transmitting (220) the compressed time domain data along with an associated compression parameter over the front haul interface from the first unit to the second unit; and decompressing (230), at the second unit, the compressed time domain data based on the compression parameter.

Abstract: A wireless communications system and a method therein for transmission of a downlink signal in a wireless communications network supporting beamforming. The system estimates uplink channel information for a radio link from a wireless device to a radio network node. Further, the system obtains downlink beamforming information related to the estimated uplink channel information from a machine learning unit. The machine learning unit comprises relationships between beamforming information and uplink channel information determined based on stored pairs of reported downlink beamforming information and measured uplink channel information. The obtained downlink beamforming information is applicable for the radio cell sector. Furthermore, the system transmits, towards the wireless device, a beamformed downlink signal using the obtained downlink beamforming information.

Abstract: Embodiments of the present disclosure provide methods and apparatus for remote interference detection. A method performed at a first network node may comprise: reporting (S101) an affair that the first network node is interfered; receiving (S102) at least one resource pattern indicating transmission resource allocated by a third network node to the first network node; transmitting (S103) an identifier of the first network node on the transmission resource. The first network node may transmit its identifier in the transmission resource allocated to first network node. Thus, any other network node may particularly try to detect this identifier in the allocated transmission resource. Miss detection or false detection may be reduced accordingly.

Abstract: The present disclosure provides a method in a network device serving a first cell and a second cell. The method includes: determining that a first User Equipment, UE, in the first cell and a second UE in the second cell are associated with one physical terminal device; and enabling, in response to said determining, the terminal device to perform as the first UE, without enabling the terminal device to perform as the second UE, one or more of: measuring a reference signal from the network device, transmitting a reference signal to the network device, or transmitting a measurement report to the network device.

Abstract: A method and an access network node are disclosed for beam control. According to an embodiment, the access network node determines first spatial domain information of a channel between a first terminal device and the access network node, based on second spatial domain information of the channel estimated by uplink signals received previously from the first terminal device at multiple time points. The access network node determines beamforming weights for the first terminal device based on the first spatial domain information.

Abstract: Embodiments of the present disclosure relate to a method and an apparatus for antenna calibration. A method performed by an apparatus for antenna calibration may comprise: inserting a calibration signal to a physical resource block allocated for a traffic signal; and distinguishing the calibration signal from the traffic signal at a calibration receiver for antenna calibration. According to embodiments of the present disclosure, antenna calibration signals and traffic signals may be transmitted simultaneously.

Abstract: Mechanisms for calibrating radio frequency branches of a radio transceiver device in a radio access network node. The method includes co-scheduling downlink time/frequency resources for terminal devices in accordance with a set of terminal device identifiers. One of the terminal device identifiers is not of any terminal device served by the radio access network node. The downlink time/frequency resources for this terminal device identifier define time/frequency resources for calibrating the radio frequency branches. The method includes determining a difference in amplitude/phase between the radio frequency branches by analysing a signal as received via an internal coupler unit in the radio transceiver device. The signal represents the time/frequency resources as transmitted over at least some of the radio frequency branches.

Abstract: Various embodiments of the present disclosure provide a method for multi-user multi-antenna transmission. The method which may be performed by a network node comprises calculating parameters for multi-user multi-antenna transmission, according to measurement information reported by a first set of terminal devices. The method further comprises selecting, from the first set of terminal devices, a second set of terminal devices to which the multi-user multi-antenna transmission is to be applied, based at least in part on performance gain estimated according to the parameters for multi-user multi-antenna transmission.

Abstract: A method and an apparatus for fault mitigation in a base station are disclosed. According to an embodiment, a faulty antenna element in an antenna array is detected. The antenna array transmits a first beam covering a predetermined range of directions. A target direction in which radiation power dropped due to a fault of the detected faulty antenna element is determined. A second beam pointing to the determined target direction is generated.

Abstract: A method is implemented in a digital unit connected with a plurality of distributed antennas including a first antenna, a second antenna and a third antenna. The method comprises: causing transmitting a first signal from the first antenna, a second signal from the second antenna, and a third signal from the third antenna in a same frequency resource; obtaining a receiver and transmitter side loop-back phase difference between the first antenna and the second antenna based on the first signal received at the third antenna, the second signal received at the third antenna, the third signal received at the first antenna, and the third signal received at the second antenna; and obtaining estimations of a time delay difference and an initial phase difference between the first and second antennas based on the obtained loop-back phase difference.

Abstract: The present disclosure provides a method (100) in a network device. The method (100) includes: determining (110) a number, N, of sets of beam vectors by: creating a first set of beam vectors orthogonal to each other; and determining an n-th set of beam vectors each obtained by linear combination of two or more beam vectors from the (n?1)-th set of beam vectors, where N and n are integers and N?n>1. The method (100) further includes: selecting (120), from one or more of the N sets, a plurality of beam vectors for beamforming of a radio signal.

Abstract: The present disclosure provides a method (100) at a first network node and a method (300) at a second network node. The method (100) at the first network node comprises performing (110) scheduling in a first frequency band and providing (120) information related to a result of the scheduling to the second network node. The method (300) at the second network node comprises obtaining (310) information related to a result of scheduling by the first network node in a first frequency band and determining (320), based at least on the information, a size of a guard band between the first frequency band and a second frequency band to be scheduled by the second network node.

Abstract: A method and an apparatus for uplink transmission control are disclosed. According to an embodiment, a base station determines a channel metric for indicating uplink channel condition between the base station and a terminal device. The base station determines an uplink transmission format that is to be used for an initial transmission from the terminal device, based on the channel metric such that a spectrum efficiency for the initial transmission can be maximized.

Abstract: A method is implemented in a digital unit connected with a plurality of distributed antennas including a first antenna, a second antenna and a third antenna. The method comprises: causing transmitting a first signal from the first antenna, a second signal from the second antenna, and a third signal from the third antenna in a same frequency resource; obtaining a receiver and transmitter side loop-back phase difference between the first antenna and the second antenna based on the first signal received at the third antenna, the second signal received at the third antenna, the third signal received at the first antenna, and the third signal received at the second antenna; and obtaining estimations of a time delay difference and an initial phase difference between the first and second antennas based on the obtained loop-back phase difference.

Abstract: Methods and apparatuses for load balance are disclosed. According to an embodiment, a first base station determines a first spatial distribution of terminal devices in a first cell of the first base station, based on measurement reports which are received from the terminal devices and comprise beam candidates suitable for serving the terminal devices. The first base station determines whether the first cell has a first area whose load needs to be offloaded, based on the first spatial distribution. When determining that the first cell has the first area, the first base station sends, to one or more neighboring base stations, an offload request comprising part of the first spatial distribution corresponding to the first area.

Abstract: The present disclosure discloses methods and devices for wireless communication. Specifically, a method for resource allocation at a network device is provided. The method includes allocating a first frequency band to at least one first terminal device utilizing a first radio access technology (RAT), and allocating a second frequency band to at least one second terminal device utilizing a second RAT. The first frequency band is at least partly overlapped with the second frequency band, and the overlapped part of the first and second frequency bands is spatially multiplexed between the at least one first terminal device and the at least one second terminal device.

Abstract: The present disclosure proposes a method, a network element, and a non-transitory computer readable storage medium for scheduling a user equipment (UE) for transmission. The method comprises: determining, for the UE, a first downlink channel status at a first time point and a second downlink channel status at a second time point which is later than the first time point, respectively, determining, for the UE, a temporal coherence between the first downlink channel status and the second downlink channel status; and scheduling the UE based on the determined temporal coherence.

Abstract: The present disclosure provides a method in a network device for transmission of Narrow Band-Internet of Things (NB-IoT) data between a Radio Equipment Control (REC) node and a Radio Equipment (RE) node over Common Public Radio Interface (CPRI). The method comprises: transmitting the NB-IoT data from the REC node to the RE node or from the RE node to the REC node in a Control and Management (C&M) region of a CPRI frame. The NB-IoT data is frequency-domain data.

Abstract: Embodiments of the present disclosure provide a method in a base station for coordinating resources in a wireless communications system with carrier aggregation in which a first group of terminal devices is served by a primary cell and one or more secondary cells under control of the base station. The method comprises obtaining information indicating arrival of a second group of terminal devices at coverage of the base station. A speed of any terminal device of the second group is higher than a speed of any terminal device of the first group. The method also comprises releasing resources on at least one secondary cell of the one or more secondary cells and allocating the released resources to the second group of terminal devices.