Methods, systems, and devices for wireless communications are described. A user equipment (UE) may update a noise estimation (e.g., a noise covariance matrix, a log likelihood ratio (LLR) scaling, or both) for communications with a serving base station to account for interference from a neighboring base station operating according to a different radio access technology (RAT). For example, the UE may identify a transmission status of a base station operating according to a first RAT, such as long term evolution (LTE), that shares a radio frequency spectrum with a serving base station operating according to a second RAT, such as new radio (NR). The UE may measure the interference from the LTE base station and may update a noise estimation according to the measured interference. The UE and the serving base station may communicate based on the updated noise estimation.

This disclosure provides systems, methods, and apparatus for wireless communications that support fast user equipment (UE) handover between base stations. A UE may receive, from a source base station, a configuration for reference signal transmission at a set of uplink transmit power levels. The UE may transmit multiple uplink reference signal repetitions based on the configuration. The source base station may transmit a request message to a target base station to measure the multiple uplink reference signal repetitions. The target base station may select an uplink reference signal and measure a transmit power correction. The target base station may transmit an indication to the source base station of the selection and transmit power correction. The source base station may evaluate the indications and select the target base station. The source base station may forward to the indicated contents, and the UE may switch and synchronize with the target base station.

Interference with another terminal caused by joint transmission of a plurality of wireless base stations is appropriately estimated. A wireless base station includes a wireless control section and a communication section. The wireless control section, when performing joint transmission with a joint wireless base station, generates a reference signal for estimating interference given to a wireless terminal connected to another wireless base station, and determines a setting regarding joint transmission in accordance with a result of estimation of interference based on the reference signal. The communication section transmits a reference signal to another wireless base station or a wireless terminal, and announces, to a joint wireless base station, a setting regarding joint transmission.

The present disclosure relates to a 5G generation or pre-5G communication system for supporting a higher data transmission rate beyond a 4G generation communication system such as LTE. According to various embodiments of the present disclosure, a method performed by a UE in a wireless communication system, the method comprising, receiving, from a base station, an RRC message including information on at least one power control set for repetition of a PUCCH transmission based on a single beam configuration, and information on one or more PUCCH resource, receiving, from the base station, a MAC CE indicating ID of the one or more PUCCH resource associated with ID of the at least one power control set; and updating the information on the at least one power control set corresponding to at least one TRP, based on the received MAC CE.

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 and a system for supporting flexible user equipment (UE) bandwidth by the UE during a random access are provided. The method includes transmitting, to a base station, a random access preamble over a first bandwidth selected among a plurality of channel bandwidths of the UE, receiving, from the base station, a random access response over a second bandwidth selected among the plurality of channel bandwidths, and transmitting, to the base station, a scheduled transmission message over a third bandwidth selected among the plurality of channel bandwidths of the UE.

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 and a system for supporting flexible user equipment (UE) bandwidth by the UE during a random access are provided. The method includes transmitting, to a base station, a random access preamble over a first bandwidth selected among a plurality of channel bandwidths of the UE, receiving, from the base station, a random access response over a second bandwidth selected among the plurality of channel bandwidths, and transmitting, to the base station, a scheduled transmission message over a third bandwidth selected among the plurality of channel bandwidths of the UE.

Methods and apparatuses for transmission of power control command are disclosed. In one embodiment, a method at a UE comprises receiving two or more TPC commands for PUCCH resources of the UE in a cell, each PUCCH resource is associated with a higher layer index value configured for a CORESET, determining a TPC command for each PUCCH resource according to the higher layer index value; and transmitting each PUCCH resource using the power according to the determined TPC command.

When a plurality of apparatuses each having a role of establishing a wireless network performs, in parallel, communication with a first apparatus having a role of joining a wireless network via a plurality of transmission channels, a communication apparatus controls, based on acquired information about a communication quality in communication between a second apparatus included in the plurality of apparatuses and the first apparatus, a transmission output of at least the second apparatus such that a difference between a communication quality in communication between an apparatus included in the plurality of apparatuses and different from the second apparatus and the first apparatus and a communication quality in communication between the second apparatus and the first apparatus becomes smaller. Alternatively, the communication apparatus determines at least one of a coding rate and a modulation scheme for use in communication between the second apparatus and the first apparatus based on the information.

Method carried out in a wireless terminal (10) for managing connection to an access network (120), comprising: connecting (501) with the access network using a first transmit spatial filter and a first receive spatial filter; obtaining (50) information associated with a trigger event to switch uplink transmit direction; switching (514), based on said trigger event, from the first transmit spatial filter to a second transmit spatial filter, while maintaining the first receive spatial filter.

A terminal includes a control unit using, in DC using first and second RATs, a first power class (PC) if a duty cycle is not greater than a threshold, the duty cycle obtained by adding a value obtained by multiplying: a first RAT duty cycle; a value obtained by dividing a maximum transmit power allowed for a network of the first RAT by a maximum transmit power for the DC corresponding to the first PC; and a ratio indicating a degree of influence of the first RAT over the second RAT, to a value obtained by multiplying: a second RAT duty cycle; and a value obtained by dividing a maximum transmit power allowed for a network of the second RAT by a maximum transmit power for the DC corresponding to the first PC, and a transmission unit performing uplink transmission to which the first PC is applied.