Various devices and methods are provided that use enhanced downlink demodulation reference signals (DMRS) to facilitate inter-cell interference cancellation and suppression. Coordinated configuration of DMRS port assignments for transmission from cells in a group of neighboring cells is provided. Each cell's physical cell identification (PCID) is mapped with its corresponding assigned antenna port(s).

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. The present invention provides a method and an apparatus which can achieve accurate time and frequency synchronization while reducing system load, in line with the design requirements for a 5G communication system. Particularly, the present invention provides a method for acquiring time and frequency synchronization by a terminal in a communication system, the method comprising the steps of: receiving a first synchronization signal from a base station; receiving a second synchronization signal from the base station; and receiving a channel state information-reference signal (CSI-RS) from the base station, and acquiring downlink time and frequency synchronization with the base station on the basis of the CSI-RS.

A method for performing uplink transmission by a terminal in a wireless communication system, where the method includes receiving, from a base station, resource setting information related to an uplink resource, which includes identification information about a transmission unit indicating a physical layer resource set; determining a transmission unit for performing the uplink transmission on the basis of the identification information; and performing the uplink transmission on the basis of the determined transmission unit.

The apparatus may be a user equipment (UE). The apparatus receives a transmission of at least one of a plurality of first synchronization signals. The apparatus receives at least one repeat transmission of the at least one of the plurality of first synchronization signals. In an aspect, the transmission and the at least one repeat transmission are received in a same synchronization signal block.

A user equipment that includes a radio transceiver that performs wireless communication in an unlicensed band, and circuitry that performs RLM using downlink physical signals, measures a radio link quality, evaluates the radio link quality against thresholds Qout and Qin, indicates out-of-sync to higher layers from a physical layer, indicates in-sync to the higher layers from the physical layer, starts a first timer when the out-of-sync is consecutively indicated to the higher layers from the physical layer, and determines that a radio link failure occurs in a case where the first timer expires without consecutive in-sync indications, and the first timer is different from a second timer used to determine whether a radio link failure occurs in a wireless communication in one or more serving cells in a licensed band.

Methods, systems, and devices for wireless communications are described. In some wireless communications systems, a first base station may receive, from one or more aggressor base stations, a first set of reference signals associated with cross-link interference (CLI) channel measurements. The first base station may identify the second base station based on receiving a second set of reference signals from each aggressor base station from the set, where each aggressor base station transmits downlink signals that interfere with uplink signals at the first base station. The first base station may measure the first set of reference signals to obtain a CLI channel measurement and transmit a measurement report indicating the CLI channel measurements. In some examples, the first base station, the second base station, or both may perform one or more CLI mitigation procedures based on the CLI channel measurements.

An apparatus (10) comprising: at least one processor (12); and at least one memory (13) including computer program instructions (14); the at least one memory (13) and the computer program instructions (14) configured to, with the at least one processor (12), cause the apparatus (10) at least to perform: receiving (201) configuration information for enabling the apparatus (10) to measure a first set of Downlink (DL) Reference Signals (RSs) (302) and/or a second set of DLRSs (304), wherein DLRSs (302 #0-302 #4) of the first set of DLRSs (302) are respectively associated with a first set of DL beams (303), wherein one or more DLRSs (302 #1-302 #3) of the first set of DLRSs (302) are configured to be Quasi-Co-Located (QCLed) with at least one DLRS (304 #m) of the second set of DLRSs (304), and wherein DLRSs (304 #a-304 #z) of the second set of DLRSs (304) are respectively associated with a second set of DL beams (305); receiving (202) information for enabling the apparatus (10) to determine a Quasi-Co-Location (QCL) assumption for a Channel Occupancy Time (COT), wherein the QCL assumption for the COT is indicative of the availability, for use for transmissions within the COT, of: at least one DL beam (305 #m) associated with the at least one DLRS (304 #m) of the second set of DLRSs (304), and one or more DL beams (303 #1-303 #3) associated with the one or more DLRSs (302 #1-302 #3) of the first set of DLRSs (302) and QCLed with the at least one DLRS (304 #m) of the second set of DLRS (304); and determining (203), based at least in part on the received information and configuration information, the QCL assumption for the COT.

Methods and apparatus in a fifth-generation wireless communications network, including an example method, in a wireless device, that includes determining a reporting quality threshold for a parameter related to channel state information (CSI); performing a measurement for each of a plurality of beams from a first predetermined set of beams for evaluation; evaluating the measurement for each of the plurality of beams against the reporting quality threshold; discontinuing the performing and evaluating of measurements in response to determining that the reporting quality threshold is met for one of the beams, such that one or more beams in the first predetermined set of beams are not measured and evaluated; and reporting, to the wireless communications network, CSI for the one of the beams.

Methods and apparatus in a fifth-generation wireless communications, including an example method, in a wireless device, that includes receiving a downlink signal comprising an uplink access configuration index, using the uplink access configuration index to identify an uplink access configuration from among a predetermined plurality of uplink access configurations, and transmitting to the wireless communications network according to the identified uplink access configuration. The example method further includes, in the same wireless device, receiving, in a first subframe, a first Orthogonal Frequency-Division Multiplexing (OFDM) transmission formatted according to a first numerology and receiving, in a second subframe, a second OFDM transmission formatted according to a second numerology, the second numerology differing from the first numerology. Variants of this method, corresponding apparatuses, and corresponding network-side methods and apparatuses are also disclosed.

A terminal apparatus and a base station apparatus can efficiently communicate with each other through downlink. A terminal apparatus detects a first physical layer cell identity (PCI) through cell search and receives system information, a first RS, and a second RS. The system information is used to indicate at least (i) a second PCI, (ii) a transmission bandwidth of EUTRA and an offset associated with a physical resource block index, and (iii) an operation of NB-IoT. A first sequence of the first RS is identified based at least on the first PCI. A second sequence of the second RS is identified based at least on the second PCI and the offset.