There is provided mechanisms for transmission of reference signals. A method is performed by a terminal device. The terminal device comprises at least two physical antenna ports. The method comprises creating a virtual antenna port for, and applied over, at least two of the physical antenna ports. The method comprises transmitting, in the virtual antenna port, as many uplink reference signals as there are physical antenna ports.

When transmitting signals from a plurality of base stations (broadcasting stations), the base stations include at least a first base station having a first antenna with a first polarization and a second base station having a second antenna with a second polarization that is different from the first polarization. Then, when the first base station transmits a signal β rom the first antenna having the first polarization, the second base station transmits the same signal as the first antenna of the first base station from a second antenna having the second polarization, at the same time.

Disclosed area method and apparatus for acquiring a PMI, and a storage medium. The method includes: searching a first group of PMI parameters according to first initial values of a PMI parameter set, and determining the first group of PMI parameters corresponding to the maximum capacity as a first group of reported values; generating second initial values of the PMI parameter set; searching a second group of PMI parameters according to the second initial values of the PMI parameter set, and determining the second group of PMI parameters corresponding to the maximum capacity as a second group of reported values; generating third initial values of the PMI parameter set; and searching a third group of PMI parameters according to the third initial values of the PMI parameter set, and determining the third group of PMI parameters corresponding to the maximum capacity as a third group of reported values.

A configuration for providing a UE null space report to optimize beam management for multi-UE communication. The apparatus transmits, to the base station, a null space report indicating one or more parameters for at least one null space of the UE based on the multiple antenna elements. The apparatus receives, from the base station, a downlink signal based on the null space report of the UE.

Beam and antenna array split configuration optimization is disclosed. A network node device generates a beam dictionary defining a set of beams. The network node device estimates a traffic density distribution for a radio channel based on obtained channel quality information. The network node device determines, for each of at least two array split configurations associated with a transceiver antenna array of the network node device, a set of optimal beams from the beam dictionary that optimizes a utility function, based on the estimated traffic density distribution. The network node device selects an array split configuration that maximizes the utility function across a coverage area of a radio cell associated with the network node device. The network node device applies the selected array split configuration to the transceiver antenna array in response to evaluating that the selected array split configuration improves downlink performance.

A terminal apparatus mounted on a movable body is provided to communicate with an external communication apparatus outside the movable body. The terminal apparatus includes an antenna, and a communicator device. The antenna includes a plurality of antenna elements to be arranged along a traveling direction of the movable body. The communicator device is configured to communicate with the external communication apparatus using a communicating antenna element that is at least one of the plurality of antenna elements. The communicating antenna element is selected from the plurality of antenna elements so as to belong to a specified region. The specified region is defined by propagation environment information of an electric wave propagation path of a signal transmitted to and received from the external communication apparatus.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a UE may communicate via a serving beam set of the UE, the serving beam set being one or more of a plurality of beams. The UE may measure another beam set in accordance with a measurement schedule configured to prioritize measurement on one or more adjacent beam sets associated with the serving beam set over one or more non-adjacent beam sets associated with the serving beam set. In some aspects, the one or more adjacent beam sets may be associated with one or more coverage areas that at least partially overlap a coverage area of the serving beam set, are adjacent to the coverage area of the serving beam set, or are associated with a measurement value that satisfies a threshold in the coverage area of the serving beam set. Numerous other aspects are provided.

Disclosed are a method for temporal/spatial polarized beams and channel non-reciprocity correction and a multi-beam antenna apparatus using the same. According to one aspect of the present disclosure, a multi-beam antenna apparatus includes an array antenna including transmission antenna elements used for forming a plurality of transmission beams and reception antenna elements used for forming a plurality of reception beams. The multi-beam antenna apparatus separates polarized beams temporally and spatially by using two kinds of different orthogonal polarizations, while corrects a channel non-reciprocity which occurs due to temporal polarization separation.

The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A method of operating a user equipment (UE) for CSI feedback is provided. The method comprises receiving configuration information for the CSI feedback from a base station (BS) and identifying a number of antenna ports for the CSI feedback. The method comprises, if the number of antenna ports is <16, identifying a first codebook for the CSI feedback corresponding to a rank value of 3 or 4, and, if otherwise, identifying a second codebook for the CSI feedback corresponding to the rank value of 3 or 4. The method comprises generating the CSI feedback using the identified codebook and transmitting the generated CSI feedback to the BS. The first codebook has a structure that partitions the antenna ports into two equal partitions. The second codebook has a structure that partitions the antenna ports into four equal partitions by partitioning each partition into two equal sub-partitions.

A CSI reporting method by a terminal in a wireless communication system can comprise the steps of: receiving, from a base station, CSI configuration information for CSI reporting; and reporting, to the base station, CSI generated on the basis of the CSI configuration information. If the CSI comprises CQI and defined is a CQI table in which different CQI indexes are allocated by different MCS levels for the CQI reporting, the CSI configuration information comprises a CQI index range reportable by the terminal in the CQI table and/or CQI configuration information relating to the interval between the CQI indexes reportable by the terminal in the CQI index range.